JP2013150231A - Communication system, mobile station device, base station device, communication method and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a signal containing control information efficiently between a base station device and a mobile station device.SOLUTION: A mobile station device includes a first wireless resource control unit for recognizing a channel used for transmission/reception of ACK/NACK in which signals generated from the information of ACK/NACK for the data transmitted are arranged, in a region where the channel used for transmission/reception of ACK/NACK may be possibly arranged, and a first control unit for controlling to demodulate the signals of a resource where the signals of a channel used for transmission/reception of ACK/NACK are arranged. A plurality of resource element groups are configured in respective physical resource block pairs in the region. The signals of a channel used for transmission/reception of ACK/NACK are arranged in the plurality of resource element groups configured in different resource block pairs.

Description

  The present invention efficiently sets an area in which a signal including control information may be arranged in a communication system including a plurality of mobile station apparatuses and a base station apparatus. A communication system, a mobile station apparatus, a base station apparatus, a mobile station apparatus that can efficiently transmit a signal including control information and a mobile station apparatus that can efficiently receive a signal including control information from the base station apparatus, The present invention relates to a communication method and an integrated circuit.

  The evolution of cellular mobile radio access methods and networks (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) is the third generation partnership project (3rd Generation Partnership Project: 3GPP). In LTE, an orthogonal frequency division multiplexing (OFDM) system, which is multicarrier transmission, is used as a communication system (downlink; referred to as DL) from a base station apparatus to a mobile station apparatus. . In LTE, a single-carrier transmission SC-FDMA (Single-Carrier Frequency Division Multiple Access) system is used as a communication system (uplink; referred to as UL) from a mobile station apparatus to a base station apparatus. Used. In LTE, a DFT-Spread OFDM (Discrete Fourier Transform-Spread OFDM) system is used as an SC-FDMA system.

  LTE-A (LTE-Advanced) that develops LTE and applies a new technology is being studied. In LTE-A, it is considered to support at least the same channel structure as LTE. A channel means a medium used for signal transmission. A channel used in the physical layer is called a physical channel, and a channel used in the medium access control (MAC) layer is called a logical channel. Physical channel types include physical downlink shared channel (PDSCH) used for transmission / reception of downlink data, control information and system information (also called SIB: System Information Block), downlink downlink Physical downlink control channel (Physical Downlink Control CHannel: PDCCH) used for transmission / reception of control information, Physical hybrid automatic repeat request channel (Physical Hybrid ARQ (Automatic Repeat ARQ) used for transmission / reception of downlink control information for uplink data reQuest) Indicator Channel: PHICH), Physical Uplink Shared Channel (PUSCH) used for transmission / reception of uplink data and control information, Physical Uplink Control Channel (Physical Uplink Control used for transmission / reception of control information) CHannel: PUCCH), establishment of downlink synchronization Synchronization channel used for communication (Synchronization CHannel: SCH), physical random access channel (Physical Random Access CHannel: PRACH) used for uplink synchronization establishment, downlink system information (MIB: also called Master Information Block) .) Is used for transmission of the physical broadcast channel (Physical Broadcast CHannel: PBCH). A mobile station apparatus or a base station apparatus arranges and transmits a signal generated from control information, data, and the like on each physical channel. Data transmitted on the physical downlink shared channel or the physical uplink shared channel is referred to as a transport block.

  The control information arranged in the physical uplink control channel is referred to as uplink control information (UCI). Uplink control information is control information (acknowledgment: ACK) or negative acknowledgment (Negative Acknowledgement: NACK) for data placed in the received physical downlink shared channel (acknowledgement: ACK / NACK), Alternatively, it is control information (Scheduling Request: SR) indicating an uplink resource allocation request, or control information (Channel Quality Indicator: CQI) indicating downlink reception quality (also referred to as channel quality). The control information arranged in the physical hybrid automatic repeat request instruction channel is control information (Acknowledgement: ACK) or negative acknowledgment (Negative Acknowledgement: NACK) for the data arranged in the received physical uplink shared channel ( Acknowledgment (ACK / NACK).

<Collaborative communication>
In LTE-A, in order to reduce or suppress interference with a mobile station apparatus in a cell edge region or to increase received signal power, inter-cell cooperative communication (Cooperative Multipoint) in which adjacent cells perform communication in cooperation with each other is performed. : CoMP communication). For example, a mode in which the base station apparatus communicates using any one frequency band is referred to as a “cell”. For example, as inter-cell cooperative communication, different weighting signal processing (precoding processing) is applied to a signal in a plurality of cells, and a plurality of base station devices cooperates to transmit the signal to the same mobile station device (Joint Processing, also called Joint Transmission). In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved, and reception characteristics in the mobile station apparatus can be improved. For example, as a cooperative communication between cells, a method (Coordinated Scheduling: CS) in which scheduling is performed for a mobile station device in cooperation with a plurality of cells has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved. For example, as a cooperative communication between cells, a method (Coordinated beamforming: CB) in which a signal is transmitted to a mobile station apparatus by applying beamforming in cooperation with a plurality of cells has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved. For example, as inter-cell cooperative communication, a method (Blanking, Muting) in which a signal is transmitted using a predetermined resource only in one cell and a signal is not transmitted using a predetermined resource in one cell has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved.

  In addition, regarding a plurality of cells used for cooperative communication, different cells may be configured by different base station devices, and different cells are different than different RRHs (Remote Radio Heads, base station devices managed by the same base station device). The outdoor type radio unit, also called Remote Radio Unit: RRU), or a different cell may be constituted by a base station apparatus and an RRH managed by the base station apparatus. The base station apparatus and the base station apparatus may be configured by RRH managed by a different base station apparatus.

  A base station apparatus with a wide coverage is generally called a macro base station apparatus. A base station apparatus with a narrow coverage is generally called a pico base station apparatus or a femto base station apparatus. RRH is generally considered to be used in an area where the coverage is narrower than that of a macro base station apparatus. A deployment such as a communication system configured by a macro base station apparatus and an RRH, and a coverage supported by the macro base station apparatus including a part or all of the coverage supported by the RRH is a heterogeneous network deployment. It is called. In such a heterogeneous network-deployed communication system, a method in which a macro base station apparatus and an RRH cooperatively transmit signals to mobile station apparatuses located within the overlapping coverage is being studied. Here, RRH is managed by the macro base station apparatus, and transmission / reception is controlled. The macro base station apparatus and the RRH are connected by a wired line such as an optical fiber or a wireless line using a relay technology. As described above, the macro base station apparatus and the RRH perform cooperative communication using radio resources that are partially or entirely the same, so that the overall frequency use efficiency in the coverage area constructed by the macro base station apparatus is increased. (Transmission capacity) can be improved.

  When the mobile station apparatus is located in the vicinity of the macro base station apparatus or RRH, the mobile station apparatus can perform single cell communication with the macro base station apparatus or RRH. That is, a certain mobile station apparatus communicates with a macro base station apparatus or RRH, without using cooperative communication, and transmits / receives a signal. For example, the macro base station apparatus receives an uplink signal from a mobile station apparatus that is close in distance to itself. For example, the RRH receives an uplink signal from a mobile station apparatus that is close in distance to the own apparatus. Furthermore, when the mobile station apparatus is located near the edge of the coverage constructed by the RRH (cell edge), measures against co-channel interference from the macro base station apparatus are required. As a multi-cell communication (cooperative communication) between a macro base station apparatus and an RRH, a method of reducing or suppressing interference with a mobile station apparatus in a cell edge region by using a CoMP scheme in which adjacent base station apparatuses cooperate with each other has been studied. Yes.

  In the downlink, the mobile station apparatus receives signals transmitted from both the macro base station apparatus and the RRH using cooperative communication. In the uplink, the mobile station apparatus receives either the macro base station apparatus or the RRH. Therefore, it is considered to transmit signals in a suitable form. For example, the mobile station apparatus transmits an uplink signal with transmission power suitable for reception of a signal by the macro base station apparatus. For example, the mobile station apparatus transmits an uplink signal with transmission power suitable for receiving a signal by RRH. Thereby, unnecessary interference in the uplink can be reduced and frequency use efficiency can be improved.

  In the mobile station apparatus, regarding the data signal reception processing, it is necessary to acquire control information indicating the modulation scheme, coding rate, spatial multiplexing number, transmission power adjustment value, resource allocation, etc. used for the data signal. In LTE-A, introduction of a new control channel for transmitting control information related to a data signal has been studied (Non-Patent Document 1). For example, improving the overall control channel capacity is being considered. For example, it has been considered to support interference coordination in the frequency domain for a new control channel. For example, it is considered to support spatial multiplexing for a new control channel. For example, it is considered to support beamforming for a new control channel. For example, it is considered to support diversity for a new control channel. For example, the use of new control channels with new types of carriers is being considered. For example, in a new type of carrier, it is considered that a reference signal that is common to all mobile station apparatuses in a cell is not transmitted. For example, in a new type of carrier, it is considered to reduce the transmission frequency of a reference signal that is common to all mobile station apparatuses in a cell as compared with the conventional case. For example, in a new type of carrier, it is considered to demodulate a signal such as control information using a unique reference signal in a mobile station apparatus.

  For example, as an application of beam forming, it is considered to apply cooperative communication and multi-antenna transmission to a new control channel. Specifically, a reference signal for a plurality of base station apparatuses and a plurality of RRHs corresponding to LTE-A to apply precoding processing to a new control channel signal and to demodulate the new control channel signal Application of the same precoding processing to (Reference Signal: RS) is also under consideration. Specifically, a plurality of base station apparatuses corresponding to LTE-A, a plurality of RRHs, a signal and RS of a new control channel to which the same precoding process is applied, and a resource region in which PDSCH is arranged in LTE It is being considered to place and send. The mobile station apparatus corresponding to LTE-A demodulates a signal of a new control channel that has been subjected to the same precoding process using the received RS that has been subjected to the precoding process, and obtains control information. It is being considered to acquire. This method eliminates the need for exchanging information about precoding processing applied to a new control channel signal between the base station apparatus and the mobile station apparatus.

  For example, as an application of diversity, a method for obtaining a frequency diversity effect by constructing a signal of a new control channel using resources separated in the frequency domain has been studied. On the other hand, when beamforming is applied to a new control channel, a method of configuring a new control channel signal using resources that are not separated in the frequency domain has been studied.

  For example, as support for spatial multiplexing, it has been studied to apply MU-MIMO (Multi User-Multi Input Multi Output) that multiplexes control channels for different mobile station apparatuses with the same resource. Specifically, it is considered that the base station apparatus transmits reference signals that are orthogonal between different mobile station apparatuses, and spatially multiplex and transmit signals of different new control channels to common resources. For example, spatial multiplexing of signals of different new control channels is realized by applying suitable beamforming (precoding process) to each of signals of different new control channels.

  In LTE-A, it is considered to introduce a new channel for a channel (PHICH) for transmitting ACK / NACK for an uplink data signal in the downlink (Non-Patent Document 2).

3GPP TSG RAN1 # 66bis, Zhuhai, China, 10-14, October, 2011, R1-113589 “Way Forward on downlink control channel enhancements by UE-specific RS” 3GPP TSG RAN1 # 67, San Francisco, USA, 14-18, November, 2011, R1-113682 “Views on enhanced PHICH”

  It has been proposed to support functions similar to those desired for a new control channel for new channels that transmit ACK / NACK in the downlink. For example, it has been proposed to support interference coordination in the frequency domain for a new channel that transmits ACK / NACK in the downlink. For example, for a new channel that transmits ACK / NACK in the downlink, demodulation of the signal is performed using a reference signal unique to the mobile station device, not a reference signal common to all mobile station devices in the cell. Has been proposed to do.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a signal including ACK / NACK, which is one type of control information, in a communication system including a plurality of mobile station apparatuses and base station apparatuses. An area where there is a possibility of being arranged can be efficiently set, and the base station apparatus can efficiently transmit a signal including ACK / NACK to the mobile station apparatus. In particular, the present invention relates to a communication system, a mobile station apparatus, a base station apparatus, a communication method, and an integrated circuit that can receive a signal including ACK / NACK.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the communication system according to the present invention is a communication system including a plurality of mobile station apparatuses and a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with the plurality of mobile station apparatuses. The base station apparatus includes a second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station apparatus as an area in which a channel used for ACK / NACK transmission / reception may be arranged; The mobile station apparatus arranges signals generated from ACK / NACK information for data transmitted by the mobile station apparatus in the plurality of physical resource block pairs set by the base station apparatus. First radio resource control unit for recognizing a channel used for transmission / reception of transmitted ACK / NACK, and the first radio resource control A first control unit that performs control so as to demodulate a signal of a resource in which a signal of a channel used for transmission / reception of the ACK / NACK recognized in step S1 is received, and each of the physical units in the region A plurality of resource element groups are configured in a resource block pair, the resource element group is configured by a plurality of resource elements, and a channel signal used for transmission / reception of the ACK / NACK is configured in a different physical resource block pair Arranged in a plurality of the resource element groups.

  (2) Further, in the communication system of the present invention, the resource element group is configured in a predetermined OFDM symbol within the region, and the second radio resource control unit sets the number of the OFDM symbols. To do.

  (3) In the communication system of the present invention, a plurality of physical resource block pairs are configured as a control channel region that is a region where a control channel may be arranged, and a channel used for transmission / reception of the ACK / NACK is A region that may be arranged is configured in the plurality of physical resource block pairs in which the control channel region is configured.

  (4) In the communication system of the present invention, a first element is configured from resources obtained by dividing one physical resource block pair in the control channel region, and the control channel is different in each of the first elements. It is characterized by comprising a set of a plurality of the first elements configured in the physical resource block pair.

  (5) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK, and a channel used for transmission / reception of ACK / NACK is arranged. In a plurality of physical resource block pairs set by the base station device as a region that may be transmitted, an ACK / N signal that is generated from ACK / NACK information for data transmitted by the mobile station device is arranged. A first radio resource control unit for recognizing a channel used for NACK transmission / reception, and a resource signal in which a channel signal used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit is arranged A first control unit that performs control so as to perform demodulation of each of the physical resource block pairs in the region. Resource element groups are configured, the resource element groups are configured from a plurality of resource elements, and a channel signal used for transmission / reception of the ACK / NACK is configured in a plurality of physical resource block pairs. It is arranged in a resource element group.

  (6) Further, in the mobile station apparatus of the present invention, the resource element group is configured in a predetermined OFDM symbol within the area, and the number of the OFDM symbols is set by the base station apparatus.

  (7) Further, in the mobile station apparatus of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and are used for transmission / reception of the ACK / NACK. Is configured in the plurality of physical resource block pairs in which the control channel region is configured.

  (8) Moreover, in the mobile station apparatus of the present invention, a first element is configured from resources obtained by dividing one physical resource block pair in the control channel region, and each control channel includes the first element. It is characterized by comprising a plurality of sets of the first elements configured in different physical resource block pairs.

  (9) The base station apparatus of the present invention is a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses, and is used for transmission / reception of ACK / NACK. A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station apparatus as an area in which a channel may be arranged, and each of the physical resource blocks in the area A plurality of resource element groups are configured in a pair, the resource element group is configured by a plurality of resource elements, and a channel signal used for transmission / reception of ACK / NACK is configured in different physical resource block pairs. It is arranged in a plurality of the resource element groups.

  (10) Further, in the base station apparatus of the present invention, the resource element group is configured in a predetermined OFDM symbol within the region, and the second radio resource control unit sets the number of the OFDM symbols. And

  (11) Further, the communication method of the present invention is a communication method used for a mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK, and is used for transmission / reception of ACK / NACK. A signal generated from ACK / NACK information for data transmitted by the mobile station apparatus is arranged in a plurality of physical resource block pairs set by the base station apparatus as an area where a channel to be assigned may be arranged. Recognizing a channel used for transmission / reception of ACK / NACK to be performed, controlling to demodulate a signal of a resource in which a signal of the channel used for transmission / reception of the recognized ACK / NACK is arranged, And a plurality of resource element groups in each physical resource block pair in the region The resource element group is composed of a plurality of resource elements, and a channel signal used for transmission / reception of the ACK / NACK is arranged in the plurality of resource element groups configured in different physical resource block pairs. It is characterized by being.

  (12) Further, the communication method of the present invention is a communication method used for a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses. Setting a plurality of physical resource block pairs for the mobile station apparatus as an area where a channel used for transmission and reception may be arranged, and in each physical resource block pair in the area A plurality of resource element groups are configured, the resource element groups are configured from a plurality of resource elements, and a channel signal used for transmission / reception of ACK / NACK is configured in a plurality of different physical resource block pairs. It is arranged in the resource element group.

  (13) An integrated circuit according to the present invention is an integrated circuit mounted on a mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK. In a plurality of physical resource block pairs set by the base station device as a region where a channel to be used may be arranged, a signal generated from ACK / NACK information for data transmitted by the mobile station device is A first radio resource control unit for recognizing a channel used for transmission / reception of arranged ACK / NACK and a channel signal used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit are arranged A first control unit that controls to demodulate a signal of a resource to be transmitted, and each physical resource in the region A plurality of resource element groups are configured in a block pair, the resource element group is configured by a plurality of resource elements, and a channel signal used for transmission / reception of the ACK / NACK is configured in different physical resource block pairs. Arranged in a plurality of the resource element groups.

  (14) An integrated circuit according to the present invention is an integrated circuit mounted on a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses, and the ACK / NACK A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station device as an area in which channels used for transmission and reception of In the physical resource block pair, a plurality of resource element groups are configured, the resource element group is configured of a plurality of resource elements, and signals of channels used for transmission / reception of ACK / NACK are in different physical resource block pairs. It is arranged in a plurality of the resource element groups configured as follows: That.

  The present disclosure discloses the present invention in terms of improvement of a communication system, a mobile station apparatus, a base station apparatus, a communication method, and an integrated circuit in which a channel used for transmission / reception of ACK / NACK is used in the mobile station apparatus and the base station apparatus. However, the communication method to which the present invention is applicable is not limited to a communication method that is upward compatible with LTE, such as LTE or LTE-A. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  According to the present invention, the base station apparatus can efficiently transmit a signal including ACK / NACK to the mobile station apparatus, and the mobile station apparatus efficiently transmits a signal including ACK / NACK from the base station apparatus. A more efficient communication system can be realized.

It is a schematic block diagram which shows the structure of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 107 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 101 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 401 of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 407 of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a flowchart which shows an example of the reception process of the signal of 2nd PHICH of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a flowchart which shows an example of the transmission process of the signal of 2nd PHICH of the base station apparatus 3 which concerns on embodiment of this invention. It is a figure explaining the outline about the whole picture of the communications system concerning the embodiment of the present invention. It is a figure which shows schematic structure of the time frame of the downlink from the base station apparatus 3 which concerns on embodiment of this invention, or RRH4 to the mobile station apparatus 5. FIG. It is a figure which shows an example of arrangement | positioning of the downlink reference signal in the downlink sub-frame of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows an example of arrangement | positioning of the downlink reference signal in the downlink sub-frame of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows DL PRB pair by which CSI-RS (transmission path condition measurement reference signal) for 8 antenna ports was mapped. It is a figure which shows schematic structure of the time frame of the uplink from the mobile station apparatus 5 which concerns on embodiment of this invention to the base station apparatus 3, RRH4. It is a figure which shows an example of schematic structure of the area | region where 2nd PDCCH may be arrange | positioned in the communication system 1 which concerns on embodiment of this invention. It is a figure explaining the logical relationship of 2nd PDCCH and E-CCE of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows an example of a structure of E-CCE of embodiment of this invention. It is a figure which shows an example of a structure of E-CCE of embodiment of this invention. It is a figure which shows an example of a structure of E-CCE and Localized E-PDCCH. It is a figure which shows an example of a structure of E-CCE and Distributed E-PDCCH. It is a figure which shows an example of schematic structure of the area | region where 2nd PHICH may be arrange | positioned in the communication system 1 which concerns on embodiment of this invention. It is a figure which shows an example of a structure of the resource element group comprised by the 2nd PHICH area | region. It is a figure which shows an example of a structure of the resource element group comprised by the 2nd PHICH area | region. It is a figure which shows an example of a structure of the resource element group comprised by the 2nd PHICH area | region. It is a figure explaining the monitoring of 2nd PDCCH of the mobile station apparatus 5 which concerns on embodiment of this invention.

  The techniques described herein include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal FDMA (OFDMA) systems, single carrier FDMA (SC-FDMA). ) System, and other systems, such as other systems. The terms “system” and “network” can often be used interchangeably. A CDMA system may implement a radio technology (standard) such as Universal Terrestrial Radio Access (UTRA) or cdma2000®. UTRA includes Wideband CDMA (WCDMA) and other improved versions of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM). OFDMA systems such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM (registered trademark), etc. Wireless technology may be implemented. UTRA and E-UTRA are part of the universal mobile communication system (UMTS). 3GPP Long Term Evolution (LTE) is a UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink. LTE-A is a system, radio technology, and standard improved from LTE. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named Third Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization named Third Generation Partnership Project 2 (3GPP2). For clarity, certain aspects of the techniques are described below for data communication in LTE, LTE-A, and LTE terminology, LTE-A terminology is used in much of the description below.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. An overview of the communication system according to the present embodiment, a configuration of a radio frame, and the like will be described with reference to FIGS. The configuration of the communication system according to the present embodiment will be described with reference to FIGS. The operation process of the communication system according to the present embodiment will be described with reference to FIGS.

  FIG. 9 is a diagram illustrating an outline of the overall image of the communication system according to the embodiment of the present invention. The communication system 1 shown in this figure includes a base station device (eNodeB, NodeB, BS: Base Station, AP: Access Point; also called an access point, macro base station) 3 and a plurality of RRHs (Remote Radio Head, Base 4) 4A, 4B, 4C, and a plurality of mobile station devices (UE: User Equipment) MS: Mobile Station, MT: Mobile Terminal, also referred to as a terminal, terminal device, or mobile terminal) 5A, 5B, 5C communicate with each other. Hereinafter, in the present embodiment, RRHs 4A, 4B, and 4C are referred to as RRH4, and the mobile station devices 5A, 5B, and 5C are referred to as mobile station devices 5 and will be described as appropriate. In the communication system 1, the base station device 3 and the RRH 4 cooperate to communicate with the mobile station device 5. In FIG. 9, the base station apparatus 3 and the RRH 4A perform cooperative communication with the mobile station apparatus 5A, the base station apparatus 3 and the RRH 4B perform cooperative communication with the mobile station apparatus 5B, and the base station apparatus 3 and the RRH 4C are mobile stations. Performs cooperative communication with the device 5C.

  Note that RRH can be said to be a special form of the base station apparatus. For example, the RRH has only a signal processing unit, and can be said to be a base station apparatus in which parameters used in the RRH are set by another base station apparatus and scheduling is determined. Therefore, in the following description, it should be noted that the expression “base station apparatus 3” appropriately includes RRH4.

<Collaborative communication>
In the communication system 1 according to the embodiment of the present invention, cooperative communication (Cooperative Multipoint: CoMP communication) in which signals are transmitted and received in cooperation using a plurality of cells may be used. For example, a mode in which the base station apparatus communicates using any one frequency band is referred to as a “cell”. For example, as cooperative communication, different weighting signal processing (precoding processing) is applied to a signal in a plurality of cells (base station device 3 and RRH4), and base station device 3 and RRH4 cooperate with the signal to transmit the same mobile station. It transmits to the apparatus 5 (Joint Processing, Joint Transmission). For example, as coordinated communication, scheduling is performed for the mobile station apparatus 5 in cooperation with a plurality of cells (base station apparatus 3 and RRH 4) (Coordinated Scheduling: CS). For example, as cooperative communication, a signal is transmitted to the mobile station apparatus 5 by applying beamforming in cooperation with a plurality of cells (base station apparatus 3 and RRH 4) (Coordinated Beamforming: CB). For example, as cooperative communication, a signal is transmitted using a predetermined resource only in one cell (base station apparatus 3 or RRH4), and a signal is transmitted using a predetermined resource in one cell (base station apparatus 3 or RRH4). Do not send (Blanking, Muting).

  Although not described in the embodiment of the present invention, different cells may be configured by different base station devices 3 with respect to a plurality of cells used for cooperative communication, or different cells may be managed by the same base station device 3. The different RRH4 may be configured, and the different cell may be configured by the base station apparatus 3 and the RRH4 managed by the base station apparatus 3 different from the base station apparatus.

  The plurality of cells are physically used as different cells, but may be logically used as the same cell. Specifically, a configuration in which a common cell identifier (Physical cell ID) is used for each cell may be used. A configuration in which a plurality of transmitting apparatuses (base station apparatus 3 and RRH 4) transmit a common signal to the same receiving apparatus using the same frequency band is referred to as a single frequency network (SFN).

  The deployment of the communication system 1 according to the embodiment of the present invention assumes a heterogeneous network deployment. The communication system 1 includes a base station device 3 and an RRH 4, and the coverage supported by the base station device 3 includes a part or all of the coverage supported by the RRH 4. Here, the coverage means an area where communication can be realized while satisfying the request. In the communication system 1, the base station device 3 and the RRH 4 transmit signals in cooperation to the mobile station device 5 located in the overlapping coverage. Here, the RRH 4 is managed by the base station apparatus 3 and transmission / reception is controlled. Note that the base station device 3 and the RRH 4 are connected by a wired line such as an optical fiber or a wireless line using a relay technology.

  When the mobile station apparatus 5 is located in the vicinity of the base station apparatus 3 or RRH4, the mobile station apparatus 5 may use single cell communication with the base station apparatus 3 or RRH4. That is, a certain mobile station apparatus 5 may communicate with the base station apparatus 3 or the RRH 4 without using cooperative communication to transmit and receive signals. For example, the base station apparatus 3 may receive an uplink signal from the mobile station apparatus 5 that is close in distance to itself. For example, the RRH 4 may receive an uplink signal from the mobile station apparatus 5 that is close in distance to the own apparatus. Further, for example, both the base station device 3 and the RRH 4 may receive uplink signals from the mobile station device 5 located near the edge of the coverage (cell edge) constructed by the RRH 4.

  Also, the mobile station apparatus 5 receives signals transmitted from both the base station apparatus 3 and the RRH 4 using cooperative communication in the downlink, and either the base station apparatus 3 or the RRH 4 in the uplink. Alternatively, the signal may be transmitted in a suitable form. For example, the mobile station apparatus 5 transmits an uplink signal with transmission power suitable for receiving a signal by the base station apparatus 3. For example, the mobile station apparatus 5 transmits an uplink signal with transmission power suitable for receiving a signal by the RRH 4.

  In the embodiment of the present invention, MU (Multi-User) -MIMO can be applied in one base station apparatus 3. For example, MU-MIMO is a precoding technique or the like for a plurality of mobile station apparatuses 5 existing in different positions (for example, area A and area B) in the area of the base station apparatus 3 using a plurality of transmission antennas. , The base station apparatus 3 controls the beam with respect to the signal for each mobile station apparatus 5, so that the base station apparatus 3 is the same in the frequency domain and the time domain for the transmission signals for a plurality of mobile station apparatuses 5. This is a technique that can maintain orthogonality with each other or reduce co-channel interference with respect to signals between the mobile station apparatuses 5 even when the above resources are used. Since signals between the mobile station devices 5 are spatially demultiplexed, it is also called SDMA (Space Division Multiple Access).

  In MU-MIMO, the base station apparatus 3 transmits a UE-specific RS (details will be described later) that is orthogonal between different mobile station apparatuses 5, and uses different second PDCCH (details will be described later) for common resources. The signal is spatially multiplexed and transmitted. In MU-MIMO, different precoding processes are applied to the signals of each mobile station apparatus 5 that are spatially multiplexed. Within the area of the base station device 3, different precoding processes can be performed on the second PDCCH and the UE-specific RS for the mobile station device 5 located in the area A and the mobile station device 5 located in the area B. Regarding the area (details will be described later) where the second PDCCH may be arranged, the area is set independently for the mobile station apparatus 5 located in area A and the mobile station apparatus 5 located in area B, The precoding process can be applied independently.

  In the communication system 1, a downlink (also referred to as DL: Downlink) which is a communication direction from the base station apparatus 3 or the RRH 4 to the mobile station apparatus 5 is a downlink pilot channel, a physical downlink control channel (PDCCH: Physical). Also referred to as Downlink Control CHannel), physical downlink shared channel (also referred to as PDSCH: Physical Downlink Shared CHannel), and physical hybrid automatic repeat request indicator channel (also referred to as PHICH: Physical Hybrid-ARQ Indicator CHannel). Consists of including. As for PDSCH, cooperative communication is applied or not applied. The PDCCH includes a first PDCCH and a second PDCCH (E-PDCCH: Enhanced-PDCCH). The PHICH includes a first PHICH and a second PHICH (E-PHICH: Enhanced-PHICH). The downlink pilot channel is used to demodulate PDSCH, first PDCCH, first type reference signal (CRS described later) used for demodulation of first PHICH, and PDSCH, second PDCCH, second PHICH. It is comprised by the 2nd type reference signal (UE-specific RS mentioned later) used and the 3rd type reference signal (CSI-RS mentioned later) used.

  From one viewpoint, the first PDCCH and the first PHICH are physical channels in which the same transmission port (antenna port and transmission antenna) as the first type reference signal is used. The second PDCCH and the second PHICH are physical channels in which the same transmission port as that of the second type reference signal is used. The mobile station apparatus 5 demodulates the signal mapped to the first PDCCH and the first PHICH using the first type reference signal, and maps the signal to the second PDCCH and the second PHICH. The signal is demodulated using a second type of reference signal. The first type of reference signal is a reference signal that is common to all mobile station apparatuses 5 in the cell, and is inserted into almost all resource blocks. Any mobile station apparatus 5 can use this reference signal. is there. For this reason, any mobile station apparatus 5 can demodulate 1st PDCCH and 1st PHICH. On the other hand, the second type of reference signal is basically a reference signal that can be inserted only into the allocated resource block (where the second PDCCH signal, the second PHICH signal, or the PDSCH signal is arranged). It is. For the second type of reference signal, precoding processing can be adaptively applied in the same manner as the second PDCCH signal, the second PHICH signal, or the PDSCH signal.

  From one viewpoint, the first PDCCH and the first PHICH are physical channels arranged in an OFDM symbol in which no PDSCH is arranged. The second PDCCH and the second PHICH are physical channels arranged in the OFDM symbol in which the PDSCH is arranged. From one viewpoint, the first PDCCH and the first PHICH are basically physical channels in which signals are arranged over all PRBs (PRBs of the first slot) in the downlink system band. The second PDCCH and the second PHICH are physical channels on which signals are arranged over the PRB pair (PRB) configured by the base station apparatus 3 in the downlink system band.

  Further, in the communication system 1, an uplink (also referred to as UL: Uplink) that is a communication direction from the mobile station device 5 to the base station device 3 or the RRH 4 is also referred to as a physical uplink shared channel (PUSCH: Physical Uplink Shared CHannel). ), Uplink pilot channel (uplink reference signal; UL RS: Uplink Reference Signal, SRS: Sounding Reference Signal, DM RS: Demodulation Reference Signal), and physical uplink control channel (PUCCH: Physical Uplink Control CHannel) To be included). A channel means a medium used for signal transmission. A channel used in the physical layer is called a physical channel, and a channel used in the medium access control (MAC) layer is called a logical channel.

  In addition, the present invention is applicable to a communication system in which, for example, cooperative communication is applied to the downlink, for example, multiple antenna transmission is applied to the downlink. A case where cooperative communication is not applied and a case where multi-antenna transmission is not applied in the uplink will be described, but the present invention is not limited to such a case.

  The PDSCH is a physical channel used for transmission / reception of downlink data and control information (different from control information transmitted on the PDCCH). The PDCCH is a physical channel used for transmission / reception of downlink control information (different from control information transmitted on the PDSCH). The PHICH is a physical channel used for transmission / reception of downlink control information for uplink data. More specifically, the PHICH is a physical channel used for transmission / reception of an acknowledgment (ACK / NACK) indicating an acknowledgment (Acknowledgement: ACK) or a negative acknowledgment (Negative Acknowledgement: NACK) for uplink data. The PUSCH is a physical channel used for transmission / reception of uplink data and control information (different from control information transmitted on the downlink). The PUCCH is a physical channel used for transmission / reception of uplink control information (uplink control information: UCI). As the type of UCI, ACK / NACK for PDSCH downlink data, scheduling request (SR) indicating whether to request resource allocation, or the like is used. Other physical channel types include synchronization channel (Synchronization CHannel: SCH) used to establish downlink synchronization and physical random access channel (Physical Random Access CHannel: PRACH) used to establish uplink synchronization. In addition, a physical broadcast channel (PBCH) used for transmission of downlink system information (also referred to as MIB: Master Information Block) is used. The PDSCH is also used for transmission of downlink system information (also referred to as SIB: System Information Block).

  The mobile station device 5, the base station device 3, or the RRH 4 arranges and transmits signals generated from control information, data, etc. in each physical channel. Data transmitted on the PDSCH or PUSCH is referred to as a transport block. In addition, an area controlled by the base station apparatus 3 or the RRH 4 is called a cell.

<Configuration of downlink time frame>
FIG. 10 is a diagram illustrating a schematic configuration of a downlink time frame from the base station apparatus 3 or the RRH 4 to the mobile station apparatus 5 according to the embodiment of the present invention. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The downlink time frame is a unit for resource allocation and the like, and is a resource block (RB) (physical resource block; also referred to as a PRB: Physical Resource Block) composed of a frequency band and a time slot having a predetermined downlink width. .)) (Physical resource block pair; referred to as PRB pair). One downlink PRB pair (referred to as downlink physical resource block pair; DL PRB pair) is referred to as two consecutive PRBs (downlink physical resource block; DL PRB in the downlink time domain). ).

  Also, in this figure, one DL PRB is composed of 12 subcarriers (referred to as downlink subcarriers) in the downlink frequency domain, and 7 OFDM (orthogonal frequency division multiplexing) in the time domain. ; Orthogonal Frequency Division Multiplexing) symbols. A downlink system band (referred to as a downlink system band) is a downlink communication band of the base station apparatus 3 or the RRH 4. For example, the downlink system bandwidth (referred to as a downlink system bandwidth) is composed of a frequency bandwidth of 20 MHz.

  In the downlink system band, a plurality of DL PRBs (DL PRB pairs) are arranged according to the downlink system bandwidth. For example, the downlink system band having a frequency bandwidth of 20 MHz is configured with 110 DL PRB pairs.

  In the time domain shown in this figure, a slot composed of seven OFDM symbols (referred to as a downlink slot) and a subframe composed of two downlink slots (referred to as a downlink subframe). There is.) Note that a unit composed of one downlink subcarrier and one OFDM symbol is referred to as a resource element (RE) (downlink resource element). Each downlink subframe includes at least a PDSCH used for transmitting information data (also referred to as a transport block), a first PDCCH used for transmitting control information for the PDSCH, and a second PDCCH, PUSCH. 1st PHICH and 2nd PHICH used for transmission of ACK / NACK with respect to the following data are arranged. In this figure, the first PDCCH and the first PHICH are composed of the first to third OFDM symbol resources of the downlink subframe, and the PDSCH, the second PDCCH, and the second PHICH are the downlink subframes. It consists of OFDM symbol resources from the 4th to the 14th of the frame. In addition, although mentioned later for details, 2nd PHICH is comprised from the resource of some OFDM symbols of the some OFDM symbol by which 2nd PDCCH is comprised.

  The PDSCH and the second PDCCH are arranged in different DL PRB pairs. The number of OFDM symbols constituting the first PDCCH and the first PHICH and the number of OFDM symbols constituting the PDSCH, the second PDCCH and the second PHICH may be changed for each downlink subframe. Good. Note that the number of OFDM symbols constituting the second PDCCH may be fixed. Note that the number of OFDM symbols constituting the second PDCCH may be set statically or semi-statically by the base station apparatus 3. For example, regardless of the number of OFDM symbols constituting the first PDCCH and the number of OFDM symbols constituting the PDSCH, the second PDCCH is composed of the fourth to fourteenth OFDM symbol resources of the downlink subframe. May be. Note that the first PHICH may be configured from a specific OFDM symbol resource. For example, the first PHICH may be configured only from the resource of the first OFDM symbol. Note that the second PHICH may be composed of a specific OFDM symbol resource. For example, the second PHICH may be configured only from the resource of the fourth OFDM symbol. Also, the second PHICH may be time-multiplexed with the PDSCH or the second PDCCH in a certain DL PRB pair. In other words, in a certain DL PRB pair, the second PHICH and the PDSCH or the second PDCCH may be configured from different OFDM symbol resources.

  Although not shown in this figure, a downlink pilot channel signal used for transmission of a downlink reference signal (reference signal: RS) (referred to as a downlink reference signal) is distributed to a plurality of downlink resource elements. Arranged. Here, the downlink reference signal includes at least different types of a first type reference signal, a second type reference signal, and a third type reference signal. For example, the downlink reference signal is used for estimating propagation path fluctuations of PDSCH, PDCCH (first PDCCH, second PDCCH) and PHICH (first PHICH, second PHICH). The first type of reference signal is used for demodulation of PDSCH, first PDCCH, and first PHICH, and is also referred to as Cell specific RS: CRS. The second type reference signal is used for demodulation of PDSCH, second PDCCH, and second PHICH, and is also referred to as UE-specific RS. For example, the third type of reference signal is used only for estimating propagation path fluctuations, and is also referred to as Channel State Information RS: CSI-RS. The downlink reference signal is a known signal in the communication system 1. Note that the number of downlink resource elements constituting the downlink reference signal may depend on the number of transmission antennas (antenna ports) used for communication to the mobile station apparatus 5 in the base station apparatus 3 and RRH4.

  In the following description, a case will be described in which CRS is used as the first type reference signal, UE-specific RS is used as the second type reference signal, and CSI-RS is used as the third type reference signal. Note that the UE-specific RS can also be used for demodulation of PDSCH to which cooperative communication is applied and PDSCH to which cooperative communication is not applied. The UE-specific RS can also be used for demodulation of the second PDCCH to which cooperative communication (precoding processing) is applied, the second PDCCH to which cooperative communication is not applied, and the second PHICH. Note that the UE-specific RS can also be used for demodulation of the second PHICH.

  PDCCH (first PDCCH or second PDCCH) is information indicating allocation of DL PRB pair to PDSCH, information indicating allocation of UL PRB pair to PUSCH, and a mobile station identifier (Radio Network Temporary Identifier: RNTI). )), A signal generated from control information such as a modulation scheme, a coding rate, a retransmission parameter, a spatial multiplexing number, a precoding matrix, and information indicating a transmission power control command (TPC command) is arranged. Control information included in the PDCCH is referred to as downlink control information (Downlink Control Information: DCI). DCI including information indicating assignment of DL PRB pair to PDSCH is referred to as downlink assignment (also referred to as DL assignment or Downlink grant), and DCI including information indicating assignment of UL PRB pair to PUSCH. Is referred to as an uplink grant (referred to as UL grant). Note that the downlink assignment includes a transmission power control command for PUCCH. The uplink assignment includes a transmission power control command for PUSCH. In addition, one PDCCH includes only information indicating resource allocation of one PDSCH, or information indicating resource allocation of one PUSCH, and information indicating resource allocation of a plurality of PDSCHs, or a plurality of information It does not include information indicating PUSCH resource allocation.

  Further, as information transmitted on the PDCCH, there is a cyclic redundancy check CRC (Cyclic Redundancy Check) code. The relationship between DCI, RNTI, and CRC transmitted on the PDCCH will be described in detail. A CRC code is generated from DCI using a predetermined generator polynomial. The generated CRC code is subjected to exclusive OR (also referred to as scrambling) processing using RNTI. A signal obtained by modulating a bit indicating DCI and a bit generated by performing exclusive OR processing on the CRC code using RNTI (referred to as CRC masked by UE ID) is actually transmitted on PDCCH. Is done.

  In the time domain, the PDSCH resource is arranged in the same downlink subframe as the downlink subframe in which the PDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged.

  In PHICH, a signal generated from ACK / NACK for data (transport block) transmitted / received by PUSCH is arranged. Note that ACK / NACK is also referred to as HARQ ACK. ACK / NACK is also referred to as HARQ indicator. Note that ACK is also referred to as positive acknowledgment. Note that NACK is also referred to as negative acknowledgment. In addition, in PHICH arranged in a certain downlink subframe, a signal generated from ACK / NACK for data transmitted / received on PUSCH of an uplink subframe preceding four subframes in the time domain is arranged.

  PHICH Coding will be described. One of the two code words is selected according to the ACK / NACK information. For example, one code word is composed of three codes. For example, <0, 0, 0> is used for one code word, and <1, 1, 1> is used for the other code word. For example, when ACK / NACK is ACK (when no error is found in the PUSCH data), a code word of <0, 0, 0> is selected. For example, when ACK / NACK is NACK (when an error is found in PUSCH data), a codeword of <1,1,1> is selected. A signal obtained by modulating the selected code word is arranged in the PHICH.

  The arrangement of the downlink reference signal will be described. FIG. 11 is a diagram illustrating an example of the arrangement of downlink reference signals in a downlink subframe of the communication system 1 according to the embodiment of the present invention. For simplification of description, FIG. 11 illustrates the arrangement of downlink reference signals in a single DL PRB pair, but a common arrangement method is used in a plurality of DL PRB pairs in the downlink system band. .

  Among the shaded downlink resource elements, R0 to R1 indicate CRSs of the antenna ports 0 to 1, respectively. Here, the antenna port means a logical antenna used in signal processing, and one antenna port may be composed of a plurality of physical antennas. A plurality of physical antennas constituting the same antenna port transmit the same signal. Although delay diversity or CDD (Cyclic Delay Diversity) can be applied using a plurality of physical antennas in the same antenna port, other signal processing cannot be used. Here, FIG. 11 shows the case where the CRS corresponds to two antenna ports, but the communication system of the present embodiment may support different numbers of antenna ports, for example, one antenna port or four antenna ports. A CRS for an antenna port may be mapped to a downlink resource. The CRS may be arranged in all DL PRB pairs in the downlink system band.

  Among the shaded downlink resource elements, D1 indicates UE-specific RS. When UE-specific RS is transmitted using a plurality of antenna ports, different codes are used for each antenna port. That is, CDM (Code Division Multiplexing) is applied to UE-specific RS. Here, the UE-specific RS is arranged and the length of the code used for the CDM according to the type of signal processing (number of antenna ports) used for the control signal and data signal arranged in the DL PRB pair. The number of downlink resource elements may be changed. FIG. 11 shows an example of arrangement of UE-specific RSs when the number of antenna ports used for UE-specific RS transmission is one (antenna port 7) or two (antenna port 7 and antenna port 8). Show. For example, in the base station apparatus 3 and the RRH 4, when the number of antenna ports used for transmission of UE-specific RS is two, a code having a code length of 2 is used and the same frequency region (subcarrier) is used. UE-specific RSs are multiplexed and arranged with two downlink resource elements in a continuous time domain (OFDM symbol) as one unit (unit of CDM). In other words, in this case, CDM is applied to multiplexing of UE-specific RS. In FIG. 11, the UE-specific RSs of the antenna port 7 and the antenna port 8 are multiplexed on D1 by CDM.

  FIG. 12 is a diagram illustrating an example of an arrangement of the downlink reference signals in the downlink subframe of the communication system 1 according to the embodiment of the present invention. Among the shaded downlink resource elements, D1 and D2 indicate UE-specific RSs. FIG. 12 shows that the number of antenna ports used for UE-specific RS transmission is three (antenna port 7, antenna port 8, and antenna port 9) or four (antenna port 7, antenna port 8, and antenna port 9). An example of UE-specific RS arrangement in the case of antenna port 10) is shown. For example, when the number of antenna ports used for transmitting UE-specific RSs in the base station apparatus 3 and RRH4 is 4, the number of downlink resource elements in which the UE-specific RSs are arranged is doubled, and 2 The UE-specific RS is multiplexed and arranged on different downlink resource elements for each antenna port. In other words, in this case, CDM and FDM (Frequency Division Multiplexing) are applied to multiplexing of UE-specific RS. In FIG. 12, the UE-specific RS of the antenna port 7 and the antenna port 8 is multiplexed by CDM on D1, the UE-specific RS of the antenna port 8 and the antenna port 9 is multiplexed by CDM on D2, and D1 and D2 are different downlinks. It is multiplexed with the link resource element by FDM.

  For example, when the number of antenna ports used for transmission of UE-specific RS in base station apparatus 3 and RRH4 is 8, the number of downlink resource elements in which UE-specific RS is arranged is changed to twice, UE-specific RSs are multiplexed and arranged using 4 downlink resource elements as a unit, using a code whose length is 4. In other words, in this case, CDMs having different code lengths are applied to multiplexing of UE-specific RSs.

  Further, in UE-specific RS, a scramble code is further superimposed on the code of each antenna port. This scramble code is generated based on the cell ID and the scramble ID notified from the base station apparatus 3 and the RRH 4. For example, the scramble code is generated from a pseudo random sequence generated based on the cell ID and the scramble ID notified from the base station apparatus 3 and the RRH 4. For example, the scramble ID is a value indicating 0 or 1. Also, the scramble ID and antenna port used can be joint coded to index information indicating them. Moreover, the parameter notified separately for every mobile station apparatus 5 may be used for the production | generation of the scramble code used for UE-specific RS. UE-specific RS is arrange | positioned in DL PRB pair of PDSCH, 2nd PDCCH, and 2nd PHICH allocated to the mobile station apparatus 5 set to use UE-specific RS.

  Further, each of the base station apparatus 3 and the RRH 4 may allocate a CRS signal to different downlink resource elements, or may allocate a CRS signal to the same downlink resource element. For example, when the cell IDs notified from the base station apparatus 3 and the RRH 4 are different, the base station apparatus 3 and the RRH 4 may allocate CRS signals to different downlink resource elements. In another example, only the base station apparatus 3 allocates CRS signals to some downlink resource elements, and the RRH 4 may not allocate CRS signals to any downlink resource elements. For example, when the cell ID is notified only from the base station apparatus 3, only the base station apparatus 3 allocates CRS signals to some downlink resource elements as described above, and the RRH 4 is any downlink resource. It is not necessary to assign a CRS signal to an element. In another example, the base station apparatus 3 and the RRH 4 may allocate a CRS signal to the same downlink resource element, and transmit the same sequence from the base station apparatus 3 and the RRH 4. For example, when the cell IDs notified from the base station apparatus 3 and the RRH 4 are the same, a CRS signal may be allocated as described above.

  FIG. 13 is a diagram showing a DL PRB pair in which CSI-RSs (transmission path condition measurement reference signals) for 8 antenna ports are arranged. FIG. 13 shows a case where CSI-RSs are arranged when the number of antenna ports (number of CSI ports) used in base station apparatus 3 and RRH 4 is 8. In FIG. 13, descriptions of CRS, UE-specific RS, PDCCH, PDSCH, PHICH, and the like are omitted for simplification of description.

  CSI-RS uses a 2-chip orthogonal code (Walsh code) in each CDM group, and a CSI port (CSI-RS port (antenna port, resource grid)) is assigned to each orthogonal code. Code division multiplexing is performed for each port. Further, each CDM group is frequency division multiplexed. CSI-RSs of 8 antenna ports of CSI ports 1 to 8 (antenna ports 15 to 22) are arranged using four CDM groups. For example, in CSI-RS CDM group C1, CSI-RSs of CSI ports 1 and 2 (antenna ports 15 and 16) are code-division multiplexed and arranged. In the CDM group C2 of CSI-RS, CSI-RSs of CSI ports 3 and 4 (antenna ports 17 and 18) are code-division multiplexed and arranged. In the CDM group C3 of CSI-RS, CSI-RSs of CSI ports 5 and 6 (antenna ports 19 and 20) are code-division multiplexed and arranged. In the CDM group C4 of CSI-RS, CSI-RSs of CSI ports 7 and 8 (antenna ports 21 and 22) are code-division multiplexed and arranged.

  When the number of CSI-RS antenna ports of the base station apparatus 3 and the RRH 4 is 8, the base station apparatus 3 and the RRH 4 can set the number of layers (number of ranks and number of spatial multiplexing) applied to the PDSCH to a maximum of 8. Moreover, the base station apparatus 3 and RRH4 can transmit CSI-RS in case the number of the antenna ports of CSI-RS is 1, 2 or 4. The base station apparatus 3 and the RRH 4 can transmit CSI-RS for one antenna port or two antenna ports by using the CDM group C1 of CSI-RS shown in FIG. The base station apparatus 3 and the RRH 4 can transmit CSI-RS for four antenna ports using the CDM groups C1 and C2 of CSI-RS shown in FIG.

  Further, the base station apparatus 3 and the RRH 4 may each allocate a CSI-RS signal to different downlink resource elements, or may allocate a CSI-RS signal to the same downlink resource element. For example, the base station device 3 and the RRH 4 may respectively assign different downlink resource elements and / or different signal sequences to the CSI-RS. In the mobile station apparatus 5, CSI-RS transmitted from the base station apparatus 3 and CSI-RS transmitted from the RRH 4 are recognized as CSI-RS corresponding to different antenna ports. For example, the base station device 3 and the RRH 4 may assign the same downlink resource element to the CSI-RS and transmit the same sequence from the base station device 3 and the RRH 4.

  The configuration of CSI-RS (CSI-RS-Config-r10) is notified from the base station device 3 and the RRH 4 to the mobile station device 5. The configuration of the CSI-RS includes information indicating the number of antenna ports set in the CSI-RS (antennaPortsCount-r10), information indicating a downlink subframe in which the CSI-RS is arranged (subframeConfig-r10), CSI-RS Information (ResourceConfig-r10) indicating a frequency region where the RS is arranged is included at least. As the number of CSI-RS antenna ports, for example, any one of 1, 2, 4, and 8 is used. As information indicating the frequency region where the CSI-RS is allocated, an index indicating the position of the first resource element is used among the resource elements where the CSI-RS corresponding to the antenna port 15 (CSI port 1) is allocated. . If the position of the CSI-RS corresponding to the antenna port 15 is determined, the CSI-RS corresponding to the other antenna port is uniquely determined based on a predetermined rule. As information indicating the downlink subframe in which the CSI-RS is arranged, the position and period of the downlink subframe in which the CSI-RS is arranged are indicated by an index. For example, if the index of subframeConfig-r10 is 5, it indicates that CSI-RS is arranged for every 10 subframes, and subframe 0 (subframe in a radio frame is included in a radio frame having 10 subframes as a unit. Indicates that the CSI-RS is arranged. Further, in another example, for example, if the index of subframeConfig-r10 is 1, it indicates that CSI-RS is arranged every 5 subframes. 6 shows that CSI-RS is arranged.

<Configuration of uplink time frame>
FIG. 14 is a diagram illustrating a schematic configuration of an uplink time frame from the mobile station apparatus 5 to the base station apparatus 3 and the RRH 4 according to the embodiment of the present invention. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. An uplink time frame is a unit for resource allocation and the like, and is a pair of physical resource blocks (uplink physical resource block pair; UL PRB pair) consisting of a frequency band and a time zone of a predetermined width of the uplink. ). One UL PRB pair is composed of two uplink PRBs (uplink physical resource block; referred to as UL PRB) that are continuous in the uplink time domain.

  Also, in this figure, one UL PRB is composed of 12 subcarriers (referred to as uplink subcarriers) in the uplink frequency domain, and 7 SC-FDMA (Single- Carrier Frequency Division Multiple Access) symbol. An uplink system band (referred to as an uplink system band) is an uplink communication band of the base station apparatus 3 and the RRH 4. The uplink system bandwidth (referred to as an uplink system bandwidth) is composed of a frequency bandwidth of 20 MHz, for example.

  In the uplink system band, a plurality of UL PRB pairs are arranged according to the uplink system bandwidth. For example, the uplink system band having a frequency bandwidth of 20 MHz is configured with 110 UL PRB pairs. In the time domain shown in this figure, a slot composed of seven SC-FDMA symbols (referred to as an uplink slot) and a subframe composed of two uplink slots (uplink subframe). Called). A unit composed of one uplink subcarrier and one SC-FDMA symbol is referred to as a resource element (referred to as an uplink resource element).

  Each uplink subframe includes at least PUSCH used for transmission of information data, PUCCH used for transmission of uplink control information (UCI), and demodulation of PUSCH and PUCCH (estimation of propagation path fluctuation). UL RS (DM RS) is arranged. Although not shown, a PRACH used for establishing uplink synchronization is arranged in any uplink subframe. Although not shown, UL RS (SRS) used for measuring channel quality, synchronization loss, and the like is arranged in any uplink subframe. The PUCCH is a UCI (ACK / NACK) indicating an acknowledgment (ACK: Acknowledgement) or a negative acknowledgment (NACK: Negative Acknowledgement) for data received using the PDSCH, and whether or not to request allocation of uplink resources. It is used to transmit at least UCI (SR: Scheduling Request) and UCI (CQI: Channel Quality Indicator) indicating downlink reception quality (also referred to as channel quality).

  In addition, when the mobile station apparatus 5 indicates to the base station apparatus 3 that an uplink resource allocation is requested, the mobile station apparatus 5 transmits a signal using the PUCCH for SR transmission. The base station apparatus 3 recognizes that the mobile station apparatus 5 is requesting uplink resource allocation from the result of detecting a signal using the PUCCH resource for transmission of the SR. When the mobile station apparatus 5 indicates to the base station apparatus 3 that it does not request allocation of uplink resources, the mobile station apparatus 5 does not transmit any signal using the PUCCH resources for transmission of the SR allocated in advance. The base station apparatus 3 recognizes that the mobile station apparatus 5 does not request uplink resource allocation from the result that the signal is not detected by the PUCCH resource for transmission of the SR.

  Also, PUCCH uses different types of signal configurations depending on whether a UCI composed of ACK / NACK is transmitted, a UCI composed of SR, or a UCI composed of CQI is transmitted. PUCCH used for transmission of ACK / NACK is called PUCCH format 1a or PUCCH format 1b. In PUCCH format 1a, BPSK (Binary Phase Shift Keying) is used as a modulation method for modulating information about ACK / NACK. In PUCCH format 1a, 1-bit information is indicated from the modulated signal. In PUCCH format 1b, QPSK (Quadrature Phase Shift Keying) is used as a modulation method for modulating information about ACK / NACK. In PUCCH format 1b, 2-bit information is indicated from the modulated signal. The PUCCH used for SR transmission is referred to as PUCCH format 1. PUCCH used for transmission of CQI only or simultaneous transmission of CQI and ACK / NACK is referred to as PUCCH format 2. For example, in PUCCH format 2, both CQI and ACK / NACK up to 2 bits can be encoded. PUCCH used for simultaneous transmission of CQI and ACK / NACK is referred to as PUCCH format 2a or PUCCH format 2b. In PUCCH format 2a and PUCCH format 2b, the reference signal (DM RS) of the uplink pilot channel is multiplied by a modulation signal generated from ACK / NACK information. In PUCCH format 2a, 1-bit information about ACK / NACK and CQI information are transmitted. In PUCCH format 2b, 2-bit information related to ACK / NACK and CQI information are transmitted.

  One PUSCH is composed of one or more UL PRB pairs, and one PUCCH is symmetrical in the frequency domain within the uplink system band, and is composed of two UL PRBs located in different uplink slots. 1 PRACH is composed of 6 UL PRB pairs in the frequency domain. For example, in FIG. 14, the UL PRB having the lowest frequency in the first uplink slot and the UL PRB having the highest frequency in the second uplink slot in the uplink subframe are used for the PUCCH. One PRB pair is configured. In addition, when the mobile station apparatus 5 is set not to perform simultaneous transmission of PUSCH and PUCCH, when the PUCCH resource and the PUSCH resource are allocated in the same uplink subframe, only the PUSCH resource is allocated. To send a signal. In addition, when the mobile station apparatus 5 is set to perform simultaneous transmission of PUSCH and PUCCH, when PUCCH resources and PUSCH resources are allocated in the same uplink subframe, the PUCCH resources are basically allocated. And PUSCH resources can be used for signal transmission.

  UL RS is a signal used for an uplink pilot channel. UL RS is a demodulation reference signal (DM RS) used for estimating PUSCH and PUCCH propagation path fluctuations, and channel quality measurement for frequency scheduling and adaptive modulation of PUSCH of base station apparatus 3 and RRH4. , The base station apparatus 3, and the sounding reference signal (SRS) used for measuring the synchronization deviation between the RRH 4 and the mobile station apparatus 5. For simplification of description, SRS is not shown in FIG. DM RSs are arranged in different SC-FDMA symbols depending on whether they are arranged in the same UL PRB as PUSCH or in the same UL PRB as PUCCH. The DM RS is a known signal in the communication system 1 that is used for estimating propagation path fluctuations of PUSCH and PUCCH.

  DM RS is arrange | positioned at the 4th SC-FDMA symbol in an uplink slot, when arrange | positioning in the same UL PRB as PUSCH. When the DM RS is arranged in the same UL PRB as the PUCCH including ACK / NACK, the DM RS is arranged in the third, fourth, and fifth SC-FDMA symbols in the uplink slot. DM RS is arrange | positioned at the 3rd, 4th, and 5th SC-FDMA symbol in an uplink slot, when arrange | positioning in the same UL PRB as PUCCH containing SR. When the DM RS is arranged in the same UL PRB as the PUCCH including the CQI, the DM RS is arranged in the second and sixth SC-FDMA symbols in the uplink slot.

  The SRS is arranged in the UL PRB determined by the base station apparatus 3, and the 14th SC-FDMA symbol in the uplink subframe (the seventh SC-FDMA symbol in the second uplink slot of the uplink subframe). ). The SRS can be arranged only in the uplink subframe (investigation reference signal subframe; referred to as SRS subframe) determined by the base station apparatus 3 in the cell. For the SRS subframe, the base station device 3 assigns a UL PRB to be assigned to the SRS, a period for transmitting the SRS for each mobile station device 5.

  FIG. 14 shows the case where the PUCCH is arranged in the UL PRB at the end in the frequency region of the uplink system band, but the second and third UL PRBs from the end of the uplink system band are used for the PUCCH. May be.

  In PUCCH, code multiplexing in the frequency domain and code multiplexing in the time domain are used. Code multiplexing in the frequency domain is processed by multiplying each code of the code sequence by a modulated signal modulated from uplink control information in subcarrier units. Code multiplexing in the time domain is processed by multiplying each code of the code sequence by a modulated signal modulated from uplink control information in units of SC-FDMA symbols. A plurality of PUCCHs are arranged in the same UL PRB, and different codes are assigned to the respective PUCCHs, and code multiplexing is realized in the frequency domain or the time domain by the assigned codes. In PUCCH (referred to as PUCCH format 1a or PUCCH format 1b) used for transmitting ACK / NACK, code multiplexing in the frequency domain and time domain is used. In PUCCH (referred to as PUCCH format 1) used for transmitting SR, code multiplexing in the frequency domain and time domain is used. In PUCCH (referred to as PUCCH format 2 or PUCCH format 2a or PUCCH format 2b) used for transmitting CQI, code multiplexing in the frequency domain is used. For simplification of description, description of the contents related to PUCCH code multiplexing is omitted as appropriate.

  The PUSCH resource is an uplink subframe after a predetermined number (for example, 4) from the downlink subframe in which the PDCCH resource including the uplink grant used to allocate the PUSCH resource is allocated in the time domain. Placed in.

  In the time domain, the PDSCH resource is arranged in the same downlink subframe as the downlink subframe in which the PDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged.

<Configuration of second PDCCH>
FIG. 15 is a schematic configuration of an area in which the second PDCCH may be arranged in the communication system 1 according to the embodiment of the present invention (hereinafter referred to as a second PDCCH area for simplification of description). It is a figure which shows an example. Note that the configuration of the second PHICH will be described later, and illustration is omitted in FIG. The base station device 3 configures (sets and arranges) a plurality of second PDCCH regions (second PDCCH region 1, second PDCCH region 2, and second PDCCH region 3) in the downlink system band. Can do. One second PDCCH region is composed of one or more DL PRB pairs. When one second PDCCH region is composed of a plurality of DL PRB pairs, it may be composed of DL PRB pairs dispersed in the frequency domain, or may be composed of DL PRB pairs that are continuous in the frequency domain. . For example, the base station device 3 can configure the second PDCCH region for each of the plurality of mobile station devices 5. Note that, in the DL PRB pair of the second PDCCH region, the second PDCCH may not be arranged (multiplexed and transmitted), and the PDSCH may be arranged (multiplexed and transmitted).

  Different transmission methods may be set for the arranged signals for each of the second PDCCH regions. For example, for a certain second PDCCH region, precoding processing is applied to a signal to be arranged. For example, a precoding process is not applied to a signal arranged for a certain second PDCCH region. Note that, in the second PDCCH region where the precoding process is applied to the arranged signal, the same precoding process can be applied to the second PDCCH and the UE-specific RS in the DL PRB pair. Note that, in the second PDCCH region where precoding processing is applied to a signal to be arranged, precoding processing applied to the second PDCCH and UE-specific RS is different between different DL PRB pairs. Processing (different precoding vectors applied) (different precoding matrices applied) may be applied.

  One second PDCCH is composed of one or more E-CCEs: Enhanced-Control Channel Elements (first element). E-CCE is a logically expressed resource. FIG. 16 is a diagram illustrating a logical relationship between the second PDCCH and the E-CCE of the communication system 1 according to the embodiment of the present invention. The E-CCE used between the base station apparatus 3 (or RRH 4) and the mobile station apparatus 5 is assigned a number for identifying the E-CCE. E-CCE numbering is performed based on a predetermined rule. Here, E-CCE t indicates E-CCE of E-CCE number t. The second PDCCH is configured by an aggregation (E-CCE Aggregation) composed of one or more E-CCEs. The number of E-CCEs constituting this aggregation is hereinafter referred to as “E-CCE aggregation number” (also referred to as E-CCE aggregation level). For example, the E-CCE aggregation number configuring the second PDCCH is set in the base station apparatus 3 according to the coding rate set in the second PDCCH and the number of bits of DCI included in the second PDCCH. . Further, a set of n E-CCEs is hereinafter referred to as “E-CCE aggregation n”.

  For example, the base station apparatus 3 configures a second PDCCH with one E-CCE (E-CCE aggregation 1), or configures a second PDCCH with two E-CCEs (E-CCE). aggregation 2) The second PDCCH is configured by four E-CCEs (E-CCE aggregation 4), or the second PDCCH is configured by eight E-CCEs (E-CCE aggregation 8) . In other words, the base station device 3 arranges and transmits the second PDCCH signal to one E-CCE to the mobile station device 5 or transmits the second PDCCH signal to two E-CCEs. A signal is arranged and transmitted, a second PDCCH signal is arranged and transmitted to four E-CCEs, or a second PDCCH signal is arranged and transmitted to eight E-CCEs. To do. For example, the base station apparatus 3 uses an E-CCE aggregation number with a small number of E-CCEs constituting the second PDCCH for the mobile station apparatus 3 with a good channel quality, to the mobile station apparatus 3 with a poor channel quality. In contrast, an E-CCE aggregation number having a large number of E-CCEs constituting the second PDCCH is used. Further, for example, when the base station apparatus 3 transmits DCI with a small number of bits, when using an E-CCE aggregation number with a small number of E-CCEs constituting the second PDCCH, the base station apparatus 3 transmits DCI with a large number of bits. The E-CCE aggregation number having a large number of E-CCEs constituting the second PDCCH is used.

  In FIG. 16, what is indicated by diagonal lines means a second PDCCH candidate. The second PDCCH candidate (E-PDCCH candidate) is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH, and the second PDCCH candidate is configured independently for each E-CCE aggregation number. . The second PDCCH candidate configured for each E-CCE aggregation number is configured by one or more different E-CCEs. The number of second PDCCH candidates is set independently for each E-CCE aggregation number. The second PDCCH candidate configured for each E-CCE aggregation number is configured of E-CCEs having consecutive numbers or E-CCEs having non-consecutive numbers. The mobile station apparatus 5 performs second PDCCH decoding detection on the number of second PDCCH candidates set for each E-CCE aggregation number. In addition, when the mobile station apparatus 5 determines that the second PDCCH addressed to the mobile station apparatus 5 has been detected, the mobile station apparatus 5 performs the second PDCCH with respect to some second PDCCH candidates among the plurality of set second PDCCH candidates. It is not necessary to detect (deactivate).

  The number of E-CCEs configured in the second PDCCH region depends on the number of DL PRB pairs that configure the second PDCCH region. For example, the amount of resources (number of resource elements) to which one E-CCE corresponds is the resource (downlink reference signal, first signal) that can be used for the second PDCCH signal within one DL PRB pair. PDCCH and resource elements used for the first PHICH are substantially equal to the amount divided into four. Also, one second PDCCH region may be configured by only one slot of a downlink subframe and may be configured by a plurality of PRBs. Also, the second PDCCH region may be configured independently of the first slot and the second slot in the downlink subframe. In the embodiment of the present invention, for simplification of description, the case where the second PDCCH region is composed of a plurality of DL PRB pairs in the downlink subframe will be mainly described. It is not limited to such cases.

  FIG. 17 is a diagram illustrating an example of the configuration of the E-CCE according to the embodiment of this invention. Here, resources constituting the E-CCE are shown, and illustrations and descriptions of unrelated parts (PDSCH, first PDCCH) are omitted. The second PHICH will be described later, and illustration is omitted in FIG. 17 for the sake of simplicity. Here, one DL PRB pair is shown. Here, the second PDCCH is composed of the 4th to 14th OFDM symbols in the downlink subframe, and CRS (R0, R1), 1 for 2 transmission antennas (antenna port 0, antenna port 1). Or a case where UE-specific RS (D1) is arranged for two transmission antennas (antenna port 7, antenna port 8, not shown). In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. A resource obtained by dividing a resource that can be used for the signal of the second PDCCH in the DL PRB pair into four is configured as one E-CCE. For example, a resource obtained by dividing a DL PRB pair resource into four in the frequency domain is configured as one E-CCE. Specifically, a resource divided for every three subcarriers in the DL PRB pair is configured as one E-CCE. For example, E-CCEs in the DL PRB pair are numbered in ascending order from E-CCEs including subcarriers that are low in the frequency domain.

  FIG. 18 is a diagram illustrating an example of the configuration of the E-CCE according to the embodiment of this invention. Compared with the example shown in FIG. 17, the number of antenna ports of the UE-specific RS is different, and three or four transmission antennas (antenna port 7, antenna port 8, antenna port 9, antenna port 10, not shown) A case where UE-specific RS (D1, D2) is arranged is shown.

  Different physical resource mappings (first physical resource mapping, second physical resource mapping) may be applied to the second PDCCH region. Specifically, the configuration (aggregation method) of the E-CCE configuring one second PDCCH is different. For example, the second PDCCH to which the first physical resource mapping is applied is referred to as a localized E-PDCCH. For example, the second PDCCH to which the second physical resource mapping is applied is referred to as a Distributed E-PDCCH.

  For example, the localized E-PDCCH is composed of one E-CCE (E-CCE aggregation 1), two E-CCEs (E-CCE aggregation 2), or four E-CCEs (E-CCE). It consists of CCE aggregation 4). A localized E-PDCCH having an E-CCE aggregation number of 2 or more is composed of a plurality of E-CCEs having consecutive E-CCE numbers (continuous in the frequency domain). For example, the distributed E-PDCCH is composed of four E-CCEs (E-CCE aggregation 4) or eight E-CCEs (E-CCE aggregation 8). The Distributed E-PDCCH is composed of a plurality of E-CCEs whose E-CCE numbers are non-contiguous (non-contiguous in the frequency domain). For example, the four E-CCEs that constitute the distributed E-PDCCH of E-CCE aggregation 4 are each configured by E-CCEs in different DL PRB pairs. In addition, eight E-CCEs constituting the distributed E-PDCCH of E-CCE aggregation 8 may be composed of E-CCEs in different DL PRB pairs, or some of the E-CCEs may be It may be composed of E-CCEs within the same DL PRB pair. For example, a plurality of E-CCEs used for one Localized E-PDCCH are composed of E-CCEs in one DL PRB pair, and a plurality of E-CCEs used for one Distributed E-PDCCH are a plurality. E-CCE in the DL PRB pair.

  FIG. 19 is a diagram illustrating an example of the configurations of E-CCE and Localized E-PDCCH. Here, a case is shown in which the second PDCCH is composed of the fourth to fourteenth OFDM symbols in the downlink subframe. Note that the second PHICH will be described later, and is not shown in FIG. 19 for the sake of simplicity. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. For example, the localized E-PDCCH of E-CCE aggregation 2 is configured by two E-CCEs from the smaller E-CCE number (lower in the frequency domain) in a certain DL PRB pair, or a certain DL PRB pair The E-CCEs are composed of two E-CCEs from the largest (higher in the frequency domain). For example, a localized E-PDCCH of E-CCE aggregation 4 is configured by four E-CCEs in a certain DL PRB pair. For example, in a certain DL PRB pair, one different E-CCE constitutes one different localized E-PDCCH (E-CCE aggregation 1). For example, in a certain DL PRB pair, two E-CCEs constitute one different localized E-PDCCH (E-CCE aggregation 1), and the remaining two E-CCEs constitute one localized E -Configure PDCCH (E-CCE aggregation 2).

  FIG. 20 is a diagram illustrating an example of a configuration of E-CCE and Distributed E-PDCCH. Here, a case is shown in which the second PDCCH is composed of the fourth to fourteenth OFDM symbols in the downlink subframe. Note that the second PHICH will be described later, and the illustration is omitted in FIG. 20 for the sake of simplicity. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. For example, a distributed E-PDCCH of E-CCE aggregation 4 is configured by E-CCEs in DL PRB pairs in which four E-CCEs are different from each other. For example, a distributed E-PDCCH of E-CCE aggregation 4 is configured by an E-CCE having the smallest E-CCE number (lowest in the frequency domain) in each DL PRB pair. For example, a distributed E-PDCCH of E-CCE aggregation 4 is configured by an E-CCE having the second smallest E-CCE number (second lowest in the frequency domain) in each DL PRB pair. For example, a distributed E-PDCCH of E-CCE aggregation 8 is composed of a plurality of E-CCEs in four DL PRB pairs, and is composed of two E-CCEs in each DL PRB pair. For example, the E-CCE aggregation 8 Distributed E-PDCCH has the largest E-CCE number (highest in the frequency domain) and the second largest E-CCE number in each DL PRB pair. And E-CCE (second highest in the frequency domain).

  In the second physical resource mapping, the E-CCEs in each DL PRB pair are different in E-CCEs constituting one Distributed E-PDCCH (relative frequency positions are different). The distributed E-PDCCH may be configured using CCE. For example, the E-CCE with the smallest E-CCE number within a certain DL PRB pair (the lowest in the frequency domain) and the second smallest E-CCE number within a certain DL PRB pair (second in frequency) (Low) E-CCE, E-CCE number is the third smallest (third lowest in frequency) in a certain DL PRB pair, and E-CCE number is fourth in a certain DL PRB pair A single distributed E-PDCCH may be configured with an E-CCE that is very small (fourth lowest in frequency) (the highest E-CCE number) (highest in the frequency domain).

  The present invention can also be applied to the case where one second PDCCH is composed of one or more DL PRBs. In other words, when one second PDCCH region is composed of a plurality of DL PRBs with only the first slot of the downlink subframe, or when one second PDCCH region is the second slot of the downlink subframe. The present invention can also be applied to a case where only a plurality of DL PRBs are included. In addition, in the DL PRB pair configured in the second PDCCH region, all resources (downlink resource elements) except for the first PDCCH and the downlink reference signal are not used for the second PDCCH signal. In addition, a configuration in which signals are not arranged (null) in some resources (downlink resource elements) may be used.

  Basically, the first physical resource mapping can be applied in the second PDCCH region to which the precoding process is applied, and the second physical resource mapping is in the second PDCCH region to which the precoding process is not applied. Can be applied. In the second physical resource mapping, since one E-PDCCH is composed of non-contiguous resources in the frequency domain, a frequency diversity effect can be obtained.

  In the mobile station device 5, one or more second PDCCH regions are configured from the base station device 3. For example, the mobile station device 5 applies the first physical resource mapping, the second PDCCH region to which the precoding process is applied, and the second physical resource mapping is applied, and the second is not applied with the precoding process. Two second PDCCH regions are configured (set, designated) with the other PDCCH regions. For example, in the mobile station device 5, only the second PDCCH region to which the second physical resource mapping is applied and the precoding process is not applied is configured. The mobile station device 5 is designated (set and configured) to perform processing (referred to as monitoring) for detecting the second PDCCH in the second PDCCH region configured by the base station device 3. The designation of monitoring of the second PDCCH may be made automatically (implicitly) by configuring the second PDCCH region in the mobile station apparatus 5, and indicates the configuration of the second PDCCH region. It may be made by signaling different from signaling. The plurality of mobile station apparatuses 5 can designate the same second PDCCH region from the base station apparatus 3. Here, the same second PDCCH region means that a plurality of DL PRB pairs constituting each second PDCCH region set in a plurality of mobile station apparatuses 5 are the same.

  Information indicating the configuration (designation, setting) of the second PDCCH region is exchanged between the base station device 3 and the mobile station device 5 before starting communication using the second PDCCH. For example, the information is performed using RRC (Radio Resource Control) signaling. Specifically, the mobile station apparatus 5 receives information indicating the position (allocation) of the DL PRB pair in the second PDCCH region from the base station apparatus 3. Also, for each of the second PDCCH regions, information indicating the type of physical resource mapping of the second PDCCH (first physical resource mapping, second physical resource mapping) is transmitted from the base station device 3 to the mobile station. The device 5 is notified.

  In addition, not the information that explicitly indicates the type of physical resource mapping of the second PDCCH, but other information is notified from the base station device 3 to the mobile station device 5, and the second PDCCH is implicitly based on the information. A configuration in which the type of physical resource mapping is recognized by the mobile station device 5 may be employed. For example, when information indicating the transmission method of the second PDCCH in each second PDCCH region is notified from the base station device 3 to the mobile station device 5 and a transmission method to which precoding processing is applied is indicated, When the mobile station apparatus 5 recognizes that the physical resource mapping of the second PDCCH region is the first physical resource mapping, and indicates a transmission method to which the precoding process is not applied, the physical resource mapping of the second PDCCH region The mobile station apparatus 5 recognizes that the mapping is the second physical resource mapping. In addition, as a default, only when the physical resource mapping of any second PDCCH is set in advance in the second PDCCH region and a physical resource mapping different from the setting is used, information indicating that fact is A configuration in which the mobile station apparatus 5 is notified from the station apparatus 3 may be used.

  The mobile station device 5 demodulates the signal of the second PDCCH using the UE-specific RS received in the second PDCCH region set by the base station device 3, and the second PDCCH addressed to itself The process which detects is performed. For example, the mobile station apparatus 5 performs demodulation of the second PDCCH signal using the UE-specific RS in the DL PRB pair to which the resource to be demodulated belongs.

  For the second PDCCH region to which the first physical resource mapping is applied, the mobile station apparatus 5 has an E-CCE aggregation number candidate (candidate combination) (candidate set) for the localized E-PDCCH as a base station apparatus. 3 may be set (configured). For example, a certain mobile station apparatus 5 uses E-CCE aggregation number 1 and E-CCE aggregation number as candidates for the localized E-PDCCH for the second PDCCH region to which the first physical resource mapping is applied. -CCE aggregation 2 and E-CCE aggregation 4 may be set. For example, a certain mobile station apparatus 5 uses E-CCE aggregation 2 and E as candidates for the E-CCE aggregation number for the localized E-PDCCH for the second PDCCH region to which the first physical resource mapping is applied. -CCE aggregation 4 may be set.

  Regarding the correspondence between each E-CCE in the DL PRB pair and the antenna port (transmission antenna) to which each E-CCE corresponds, each E-CCE in the DL PRB pair can be transmitted from a different antenna port. .

  In the second PDCCH region in which the localized E-PDCCH is arranged, as shown in FIG. 18, UE-specific RS for four transmission antennas (antenna port 7, antenna port 8, antenna port 9, and antenna port 10). (D1, D2) may be arranged. Regarding the combination of each E-CCE in the DL PRB pair and the corresponding antenna port, a plurality of combinations may be used. In each combination, a corresponding antenna port is different for each E-CCE in the DL PRB pair. Each E-CCE signal in the DL PRB pair is transmitted from the corresponding antenna port. The antenna port used for the E-CCE signal and the antenna port used for transmission of the UE-specific RS are common.

  For example, four types of combinations (first combination, second combination, third combination, and fourth combination) may be used for combining each E-CCE in the DL PRB pair and the corresponding antenna port. Good. In the first combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 7, the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 8, The second PDCCH signal of CCE n + 2 is transmitted from antenna port 9, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 10. In the second combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from antenna port 8, the second PDCCH signal of E-CCE n + 1 is transmitted from antenna port 9, and E−CCE n + 1 The CCE n + 2 second PDCCH signal is transmitted from the antenna port 10, and the E-CCE n + 3 second PDCCH signal is transmitted from the antenna port 11. In the third combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 9, the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 10, The second PDCCH signal of CCE n + 2 is transmitted from antenna port 7, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 8. In the fourth combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 10, and the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 7. The second PDCCH signal of CCE n + 2 is transmitted from antenna port 8, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 9.

  For each mobile station apparatus 5, any combination may be set by the base station apparatus 3 regarding the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. For example, this setting is performed using RRC signaling. The base station apparatus 3 transmits each E-CCE signal in the DL PRB pair from the corresponding transmission antenna. That is, the base station apparatus 3 controls the antenna port that transmits each E-CCE signal according to which mobile station apparatus 5 transmits each E-CCE signal in the DL PRB pair. . The mobile station apparatus 5 demodulates each E-CCE signal in the DL PRB pair using the UE-specific RS transmitted from the corresponding transmission antenna.

  For example, if the base station apparatus 3 determines that the situation is suitable for application of MU-MIMO, different combinations of different mobile station apparatuses with respect to combinations of each E-CCE in the DL PRB pair and corresponding antenna port 5 may be set for the second PDCCH region for 5. For example, the situation suitable for the application of MU-MIMO is a situation in which beam forming (precoding processing) in which large interference does not occur with respect to signals for mobile station apparatuses 5 with different base station apparatuses 3 can be applied. There is a case where there is a request for transmitting a second PDCCH signal to each of the mobile station devices 5 of a plurality of geographically distant mobile station devices 5. For example, for a plurality of mobile station devices 5 present in geographically close positions, it is difficult to apply beam forming that does not cause large interference between signals for each mobile station device 5, The base station apparatus 3 may not apply MU-MIMO to the second PDCCH signal for the mobile station apparatuses 5. In addition, beam forming (precoding) optimum for the characteristics of transmission / reception signals is common to a plurality of mobile station apparatuses 5 that are geographically close to each other. For example, when the base station apparatus 3 determines that the situation is not suitable for application of MU-MIMO, the same (common) combination is used for the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. You may set with respect to the 2nd PDCCH area | region with respect to the different mobile station apparatus 5. FIG.

  Processing when the base station apparatus 3 determines that the situation is suitable for application of MU-MIMO will be described. For example, a case will be described in which two mobile station devices 5 exist at different positions (for example, area A and area B) in the area of the base station device 3. For convenience of explanation, the mobile station device 5 located in the area A is referred to as a mobile station device 5A-1, and the mobile station device 5 located in the area B is referred to as a mobile station device 5B-1. The base station apparatus 3 sets the first combination for the second PDCCH region of the mobile station apparatus 5A-1 regarding the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. The base station apparatus 3 sets the third combination for the second PDCCH region of the mobile station apparatus 5B-1 with respect to the combination of each E-CCE in the DL PRB pair and the corresponding antenna port.

  For example, the base station apparatus 3 transmits a second PDCCH signal from the antenna port 7 to the mobile station apparatus 5A-1 using the E-CCE n resource, and uses the E-CCE n resource to transmit the antenna port 9. Transmits a second PDCCH signal to mobile station apparatus 5B-1. Here, the base station apparatus 3 performs precoding processing suitable for the mobile station apparatus 5A-1 on the second PDCCH signal transmitted from the antenna port 7 and the UE-specific RS. Precoding processing suitable for the mobile station apparatus 5B-1 is performed on the second PDCCH signal to be transmitted and the UE-specific RS.

  The mobile station device 5A-1 demodulates the second PDCCH signal of the E-CCE n resource using the UE-specific RS corresponding to the antenna port 7. The mobile station device 5B-1 demodulates the second PDCCH signal of the E-CCE n resource using the UE-specific RS corresponding to the antenna port 9. Here, since the mobile station apparatus 5A-1 and the mobile station apparatus 5B-1 are located at positions that are geographically sufficiently different, the base station apparatus 3 has a large response to the second PDCCH signal for both mobile station apparatuses 5. Beam forming (precoding processing) that does not cause interference can be applied. As described above, MU-MIMO may be realized.

  For example, the base station apparatus 3 transmits a second PDCCH signal from the antenna port 7 to the mobile station apparatus 5A-1 using the E-CCE n resource, and uses the E-CCE n + 1 resource to transmit the antenna port 8. 2 transmits a second PDCCH signal to mobile station apparatus 5A-1 and transmits a second PDCCH signal to mobile station apparatus 5B-1 from antenna port 9 using E-CCE n resources. A second PDCCH signal is transmitted from antenna port 10 to mobile station apparatus 5B-1 using CCE n + 1 resources.

  Here, the base station device 3 performs precoding processing suitable for the mobile station device 5A-1 on the second PDCCH signal and the UE-specific RS transmitted from the antenna port 7 and the antenna port 8, Precoding processing suitable for the mobile station apparatus 5B-1 is performed on the second PDCCH signal and the UE-specific RS transmitted from the antenna port 9 and the antenna port 10.

  The mobile station device 5A-1 demodulates the second PDCCH signal of the resource of E-CCE n using the UE-specific RS corresponding to the antenna port 7, and determines the UE-specific RS corresponding to the antenna port 8. The second PDCCH signal of the E-CCE n + 1 resource is demodulated. The mobile station device 5B-1 demodulates the second PDCCH signal of the resource of E-CCE n using the UE-specific RS corresponding to the antenna port 9, and determines the UE-specific RS corresponding to the antenna port 10. The second PDCCH signal of the E-CCE n + 1 resource is demodulated.

  Here, since the mobile station apparatus 5A-1 and the mobile station apparatus 5B-1 are located at positions that are geographically sufficiently different, the base station apparatus 3 has a large response to the second PDCCH signal for both mobile station apparatuses 5. Beam forming (precoding processing) that does not cause interference can be applied. As described above, MU-MIMO may be realized.

  For example, a mobile station device 5 (mobile station device 5A-2) different from the mobile station device 5A-1 exists in the area A, and a mobile station device 5 (mobile) different from the mobile station device 5B-1 in the area B A case where the station device 5B-2) exists will be described. The base station apparatus 3 sets the first combination for the second PDCCH region of the mobile station apparatus 5A-1 regarding the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. The base station apparatus 3 sets the third combination for the second PDCCH region of the mobile station apparatus 5A-2 with respect to the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. The base station apparatus 3 sets the third combination for the second PDCCH region of the mobile station apparatus 5B-1 with respect to the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. The base station device 3 sets the first combination for the second PDCCH region of the mobile station device 5B-2 with respect to the combination of each E-CCE in the DL PRB pair and the corresponding antenna port.

  For example, the base station apparatus 3 transmits a second PDCCH signal from the antenna port 7 to the mobile station apparatus 5A-1 using the E-CCE n resource, and uses the E-CCE n resource to transmit the antenna port 9. Transmits a second PDCCH signal to mobile station apparatus 5B-1. The base station apparatus 3 transmits the second PDCCH signal to the mobile station apparatus 5A-2 from the antenna port 8 using the resource of E-CCE n + 3, and moves from the antenna port 10 using the resource of E-CCE n + 3. A second PDCCH signal is transmitted to station apparatus 5B-2.

  Here, the base station apparatus 3 performs precoding processing suitable for the mobile station apparatus 5A-1 on the second PDCCH signal transmitted from the antenna port 7 and the UE-specific RS, and from the antenna port 8 Precoding processing suitable for the mobile station apparatus 5A-2 is performed on the second PDCCH signal to be transmitted and the UE-specific RS, and the second PDCCH signal and UE-specific RS to be transmitted from the antenna port 9 are executed. Precoding processing suitable for the mobile station apparatus 5B-1 is performed on the second PDCCH signal and UE-specific RS transmitted from the antenna port 10 and suitable for the mobile station apparatus 5B-2. Perform precoding processing.

  The mobile station device 5A-1 demodulates the second PDCCH signal of the E-CCE n resource using the UE-specific RS corresponding to the antenna port 7. The mobile station apparatus 5A-2 demodulates the signal of the second PDCCH of the resource of E-CCE n + 3 using the UE-specific RS corresponding to the antenna port 8. The mobile station device 5B-1 demodulates the second PDCCH signal of the E-CCE n resource using the UE-specific RS corresponding to the antenna port 9. The mobile station apparatus 5B-2 demodulates the second PDCCH signal of the resource of E-CCE n + 3 using the UE-specific RS corresponding to the antenna port 10.

  Here, since the mobile station apparatus 5A-1 and the mobile station apparatus 5B-1 are located at positions that are geographically sufficiently different, the base station apparatus 3 has a large response to the second PDCCH signal for both mobile station apparatuses 5. Beam forming (precoding processing) that does not cause interference can be applied. Here, since the mobile station device 5A-2 and the mobile station device 5B-2 are located in geographically sufficiently different positions, the base station device 3 is larger than the second PDCCH signal for both mobile station devices 5. Beam forming (precoding processing) that does not cause interference can be applied. As described above, MU-MIMO may be realized.

  For example, the base station apparatus 3 transmits a second PDCCH signal from the antenna port 7 to the mobile station apparatus 5A-1 using the E-CCE n resource, and uses the E-CCE n + 1 resource to transmit the antenna port 8. Transmits a second PDCCH signal to the mobile station apparatus 5A-1 and transmits a second PDCCH signal to the mobile station apparatus 5A-2 from the antenna port 7 using a resource of E-CCE n + 2. A second PDCCH signal is transmitted from antenna port 8 to mobile station apparatus 5A-2 using CCE n + 3 resources, and a second PDCCH signal is transmitted from antenna port 9 to mobile station apparatus 5B-1 using E-CCE n resources. PDCCH signal is transmitted from the antenna port 10 to the mobile station apparatus 5B-1 using the E-CCE n + 1 resource. The second PDCCH signal is transmitted, the second PDCCH signal is transmitted from the antenna port 9 to the mobile station apparatus 5B-2 using the E-CCE n + 2 resource, and the antenna port is transmitted using the E-CCE n + 3 resource. 10 transmits a second PDCCH signal to mobile station apparatus 5B-2.

  Here, the base station apparatus 3 is suitable for the mobile station apparatus 5A-1 and the mobile station apparatus 5A-2 with respect to the second PDCCH signal transmitted from the antenna port 7 and the antenna port 8 and the UE-specific RS. Precoding processing is performed, and precoding suitable for the mobile station apparatus 5B-1 and the mobile station apparatus 5B-2 is performed on the second PDCCH signal transmitted from the antenna port 9 and the antenna port 10 and the UE-specific RS. Execute the process.

  The mobile station device 5A-1 demodulates the second PDCCH signal of the resource of E-CCE n using the UE-specific RS corresponding to the antenna port 7, and determines the UE-specific RS corresponding to the antenna port 8. The second PDCCH signal of the E-CCE n + 1 resource is demodulated. The mobile station device 5A-2 demodulates the second PDCCH signal of the resource of E-CCE n + 2 using the UE-specific RS corresponding to the antenna port 7, and determines the UE-specific RS corresponding to the antenna port 8. The second PDCCH signal of the E-CCE n + 3 resource is demodulated. The mobile station device 5B-1 demodulates the second PDCCH signal of the resource of E-CCE n using the UE-specific RS corresponding to the antenna port 9, and determines the UE-specific RS corresponding to the antenna port 10. The second PDCCH signal of the E-CCE n + 1 resource is demodulated. The mobile station device 5B-2 demodulates the second PDCCH signal of the resource of E-CCE n + 2 using the UE-specific RS corresponding to the antenna port 9, and determines the UE-specific RS corresponding to the antenna port 10. The second PDCCH signal of the E-CCE n + 3 resource is demodulated.

  Here, since the mobile station apparatus 5A-1 and the mobile station apparatus 5A-2 and the mobile station apparatus 5B-1 and the mobile station apparatus 5B-2 are located at geographically different positions, the base station apparatus 3 Beam forming (precoding processing) that does not cause large interference can be applied to the second PDCCH signal for the mobile station apparatus 5 located in a different area. Further, since the mobile station device 5A-1 and the mobile station device 5A-2 are located at a geographically sufficiently close position (area A), suitable beam forming (precoding processing) is common, so that the base station device 3 Can efficiently transmit the second PDCCH signal to both the mobile station apparatus 5A-1 and the mobile station apparatus 5A-2 using the same antenna port (antenna port 7 and antenna port 8). In addition, since the mobile station device 5B-1 and the mobile station device 5B-2 are located in a geographically sufficiently close position (area B), suitable beam forming (precoding processing) is common, so the base station device 3 Can efficiently transmit the second PDCCH signal to both the mobile station apparatus 5B-1 and the mobile station apparatus 5B-2 using the same antenna port (antenna port 9 and antenna port 10). As described above, MU-MIMO may be realized.

  A process when the base station apparatus 3 determines that the situation is not suitable for application of MU-MIMO will be described. For example, a case will be described in which four mobile station apparatuses 5 exist in different positions (for example, area C, area D, area E, and area F) in the area of the base station apparatus 3. For convenience of explanation, the mobile station device 5 located in the area C is referred to as a mobile station device 5C-1, the mobile station device 5 located in the area D is referred to as a mobile station device 5D-1, and the mobile station device located in the area E. 5 is referred to as a mobile station device 5E-1, and the mobile station device 5 located in the area F is referred to as a mobile station device 5F-1. Here, the areas C, D, E, and F are not sufficiently separated from each other, and a large interference occurs with the second PDCCH signal for the mobile station apparatus 5 located in each area. A case where it is difficult to apply such beamforming (precoding processing) and it is difficult to apply MU-MIMO will be described. In addition, the areas C, D, E, and F are not very close to each other, and beam forming (precoding processing) suitable for the second PDCCH signal for the mobile station apparatus 5 located in each area. ) Are different. The base station apparatus 3 uses the second PDCCH region of the mobile station apparatus 5C-1 and the second PDCCH of the mobile station apparatus 5D-1 regarding the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. A first combination is set for each of the region, the second PDCCH region of mobile station device 5E-1, and the second PDCCH region of mobile station device 5F-1.

  For example, the base station apparatus 3 transmits a second PDCCH signal from the antenna port 7 to the mobile station apparatus 5C-1 using the E-CCE n resource, and uses the E-CCE n + 1 resource to transmit the antenna port 8. Transmits a second PDCCH signal to the mobile station apparatus 5D-1 from the antenna port 9, and transmits a second PDCCH signal to the mobile station apparatus 5E-1 using the resource of E-CCE n + 2. A second PDCCH signal is transmitted from antenna port 10 to mobile station apparatus 5F-1 using the resources of CCE n.

  Here, the base station apparatus 3 performs precoding processing suitable for the mobile station apparatus 5C-1 on the second PDCCH signal and UE-specific RS transmitted from the antenna port 7, and the antenna port 8 Precoding processing suitable for the mobile station apparatus 5D-1 is performed on the second PDCCH signal to be transmitted and the UE-specific RS, and the second PDCCH signal and UE-specific RS to be transmitted from the antenna port 9 are executed. Precoding processing suitable for the mobile station apparatus 5E-1 is performed on the second PDCCH signal and UE-specific RS transmitted from the antenna port 10 and suitable for the mobile station apparatus 5F-1 Perform precoding processing.

  The mobile station apparatus 5C-1 demodulates the signal of the second PDCCH of the E-CCE n resource using the UE-specific RS corresponding to the antenna port 7. The mobile station device 5D-1 demodulates the signal of the second PDCCH of the resource of E-CCE n + 1 using the UE-specific RS corresponding to the antenna port 8. The mobile station device 5E-1 demodulates the second PDCCH signal of the resource of E-CCE n + 2 using the UE-specific RS corresponding to the antenna port 9. The mobile station device 5F-1 demodulates the second PDCCH signal of the resource of E-CCE n + 3 using the UE-specific RS corresponding to the antenna port 10.

  As described above, the base station device 3 can independently execute suitable beamforming (precoding processing) on each of the second PDCCH signals for the mobile station devices 5 located in the respective areas. it can. Therefore, a request can be satisfied regarding the characteristics of the second PDCCH signal for the mobile station apparatus 5 located in each area.

  It should be noted that areas C, D, E, and F are separated from each other so that no significant interference occurs with the second PDCCH signal for mobile station apparatus 5 located in each area. In a situation where beam forming (precoding processing) can be applied, and when MU-MIMO can be applied, the base station apparatus 3 includes antenna ports corresponding to each E-CCE in the DL PRB pair. For example, the first combination is set for the second PDCCH region of the mobile station device 5C-1, and the second combination is set for the second PDCCH region of the mobile station device 5D-1. Then, a third combination is set for the second PDCCH region of the mobile station device 5E-1, and for the second PDCCH region of the mobile station device 5F-1. A fourth combination may be set.

  Hereinafter, a control signal mapped (arranged) to the second PDCCH will be described. The control signal mapped to the second PDCCH is processed for each control information for one mobile station apparatus 5 and can be subjected to scramble processing, modulation processing, layer mapping processing, precoding processing, and the like, similarly to the data signal. . Here, the layer mapping process means a part of the MIMO signal process performed when multi-antenna transmission is applied to the second PDCCH. For example, the second PDCCH to which the precoding process is applied and the precoding process are not applied, but the layer mapping process is performed on the second PDCCH to which transmission diversity is applied. In addition, the control signal mapped to the second PDCCH can be subjected to a common precoding process together with the UE-specific RS. At this time, it is preferable that the precoding process is performed with a precoding weight suitable for the mobile station apparatus 5 unit.

  Moreover, UE-specific RS is multiplexed by the base station apparatus 3 by DL PRB pair by which 2nd PDCCH is arrange | positioned. The mobile station apparatus 5 demodulates the second PDCCH signal using the UE-specific RS. The UE-specific RS used for the demodulation of the second PDCCH may be set for each combination of the E-CCE and the corresponding antenna port in the DL PRB pair for each second PDCCH region. Good. That is, for each mobile station device 5, different combinations may be set for the combination of each E-CCE in the DL PRB pair of the second PDCCH region and the corresponding antenna port. In the second PDCCH region to which the first physical resource mapping is applied, UE-specific RSs of a plurality of transmission antennas (antenna port 7, antenna port 8, antenna port 9, and antenna port 10) are arranged. In the second PDCCH region to which the second physical resource mapping is applied, the UE-specific RS of one transmission antenna (antenna port 7) is arranged. In the second PDCCH region to which the second physical resource mapping is applied, when transmitting diversity such as SFBC (Space Frequency Block Coding) is applied to the distributed E-PDCCH, two transmission antennas (antenna ports) 7, UE-specific RS of antenna port 8) may be arranged.

  In the second PDCCH region to which the first physical resource mapping is applied, each E-CCE in the DL PRB pair corresponds to a different transmission antenna, and a signal is transmitted from the corresponding transmission antenna. In the second PDCCH region to which the second physical resource mapping is applied, each E-CCE in the DL PRB pair corresponds to the same (common) transmission antenna, and a signal is transmitted from the corresponding transmission antenna. .

  For example, in the second PDCCH region to which the first physical resource mapping is applied, the first combination, the second combination, the second combination, and the combination of each E-CCE in the DL PRB pair and the corresponding antenna port. Three combinations or a fourth combination may be used. That is, for each mobile station device 5, any combination from among a plurality of combinations may be set (configured). In the first combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 7, the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 8, The second PDCCH signal of CCE n + 2 is transmitted from antenna port 9, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 10. In the second combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from antenna port 8, the second PDCCH signal of E-CCE n + 1 is transmitted from antenna port 9, and E−CCE n + 1 The CCE n + 2 second PDCCH signal is transmitted from the antenna port 10, and the E-CCE n + 3 second PDCCH signal is transmitted from the antenna port 11. In the third combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 9, the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 10, The second PDCCH signal of CCE n + 2 is transmitted from antenna port 7, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 8. In the fourth combination, in FIG. 18, the second PDCCH signal of E-CCE n is transmitted from the antenna port 10, and the second PDCCH signal of E-CCE n + 1 is transmitted from the antenna port 7. The second PDCCH signal of CCE n + 2 is transmitted from antenna port 8, and the second PDCCH signal of E-CCE n + 3 is transmitted from antenna port 9.

  Here, the relationship between the first combination, the second combination, the third combination, and the fourth combination may be referred to as a relationship in which the antenna port corresponding to each E-CCE in the DL PRB pair is shifted. it can. The relationship between the first combination and the third combination will be described. A plurality of E-CCEs in the DL PRB pair are divided into a plurality of groups (sets). For example, it is divided into two groups (group A and group B). The first combination and the third combination can be referred to as a relationship in which a set of antenna ports corresponding to each E-CCE in the group is switched between the groups. More specifically, the first combination group A (E-CCE n and E-CCE n + 1 shown in FIG. 18) and the corresponding antenna port set (antenna port 7 and antenna port 8) and the third combination group B (E-CCE n + 2 and E-CCE n + 3 described in FIG. 18) and the corresponding antenna port set (antenna port 7 and antenna port 8) corresponding to the first combination group B (E in FIG. 18). -CCE n + 2 and E-CCE n + 3) and corresponding antenna port set (antenna port 9 and antenna port 10) and third combination group A (E-CCE n and E-CCE n + 1 shown in FIG. 18) and corresponding It is the same as the antenna port set (antenna port 9 and antenna port 10). The relationship between the second combination and the fourth combination is the same as the relationship between the first combination and the third combination.

  Note that a scramble ID defined in advance may be used for generating the UE-specific RS arranged in the second PDCCH region. For example, any value of 0 to 3 may be defined as the scramble ID used for the UE-specific RS. Moreover, the parameter notified separately for every mobile station apparatus 5 may be used for the production | generation of the scramble code used for UE-specific RS arrange | positioned at a 2nd PDCCH area | region.

  For example, in the second PDCCH region to which the second physical resource mapping is applied, any antenna port may be used as a common antenna port corresponding to each E-CCE in the DL PRB pair. That is, any antenna port may be set (configured) from among a plurality of antenna ports for each second PDCCH region to which the second physical resource mapping is applied. For example, antenna port 7 is used. In FIG. 17, the second PDCCH signal of E-CCE n is transmitted from antenna port 7, and the second PDCCH signal of E-CCE n + 1 is transmitted from antenna port 7. The second PDCCH signal of E-CCE n + 2 is transmitted from the antenna port 7, and the second PDCCH signal of E-CCE n + 3 is transmitted from the antenna port 7. For example, antenna port 8 is used, and in FIG. 17, the second PDCCH signal of E-CCE n is transmitted from antenna port 8, and the second PDCCH signal of E-CCE n + 1 is transmitted from antenna port 8. The second PDCCH signal of E-CCE n + 2 is transmitted from the antenna port 8, and the second PDCCH signal of E-CCE n + 3 is transmitted from the antenna port 8.

<Configuration of the second PHICH>
FIG. 21 is a schematic configuration of a region where the second PHICH may be arranged in the communication system 1 according to the embodiment of the present invention (hereinafter, referred to as a second PHICH region for simplification of description). It is a figure which shows an example. The base station device 3 can configure (set, arrange) the second PHICH region in the downlink system band. The base station device 3 may configure a plurality of second PHICH regions in the downlink system band. In the frequency domain, one second PHICH region is composed of a plurality of DL PRB pairs. Note that one second PHICH region is preferably composed of a plurality of DL PRB pairs dispersed in the frequency region. For example, the base station device 3 can configure a second PHICH region for each of the plurality of mobile station devices 5.

  In the time domain, the second PHICH region is composed of a specific OFDM symbol (one OFDM symbol or multiple OFDM symbols). For example, the second PHICH region is composed of the fourth OFDM symbol in the downlink subframe (shown in FIG. 21). For example, the second PHICH region includes a third OFDM symbol and a fourth OFDM symbol in the downlink subframe (not shown in FIG. 21). For example, the second PHICH region includes a third OFDM symbol, a fourth OFDM symbol, and a twelfth OFDM symbol in the downlink subframe (not shown in FIG. 21).

  The second PHICH region is configured to overlap with the second PDCCH region. Specifically, the second PHICH region is configured in some DL PRB pairs of the plurality of DL PRB pairs that configure the second PDCCH region. Specifically, the second PHICH region is configured in some OFDM symbols of the plurality of OFDM symbols that configure the second PDCCH region. Note that the second PHICH region may be configured in all DL PRB pairs of the plurality of DL PRB pairs that configure the second PDCCH region. That is, the second PHICH region is frequency-multiplexed and / or time-multiplexed with the second PDCCH region.

  In the second PHICH region, some DL PRB pairs of the plurality of DL PRB pairs constituting the second PDCCH region to which the second physical resource mapping is applied, and the second physical resource mapping are applied. It is configured as a part of a plurality of OFDM symbols constituting the second PDCCH region.

  Note that the DL PRB pair in which the second PHICH region is configured and the second PHICH is not actually arranged (multiplexed or transmitted) in the OFDM symbol resource in which the second PHICH region is configured. Even if it exists, 2nd PDCCH or PDSCH is not arrange | positioned (multiplexing and transmission). The mobile station apparatus 5 in which the PDSCH resource is allocated to the DL PRB pair in which the second PHICH region is configured receives the PDSCH signal without using the OFDM symbol resource in which the second PHICH region is configured. Demodulate. Here, not using a resource means that a demodulation process for detecting a PDSCH signal is not performed on a signal arranged in the resource, and a decoding process is not performed. The mobile station apparatus 5 that performs the detection process of the second PDCCH signal using the DL PRB pair resource in which the second PHICH region is configured does not use the OFDM symbol resource in which the second PHICH region is configured. In addition, the second PDCCH signal is detected. Here, not using a resource means that a demodulation process for detecting the second PDCCH signal is not performed on a signal arranged in the resource, and a decoding process is not performed.

  The signal configuration of the second PHICH will be described. One second PHICH signal is arranged in a plurality of resource element groups. One resource element group is composed of a plurality of downlink resource elements, and is composed of, for example, four downlink resource elements. For example, one second PHICH signal is arranged in three resource element groups. A block (codeword) of information bits of downlink ACK / NACK is modulated, and the modulated symbol block is multiplied by an orthogonal sequence to generate a second PHICH signal. For example, BPSK is used as the second PHICH signal modulation method. For example, an orthogonal sequence having a sequence length of 4 is used as the orthogonal sequence of the second PHICH signal. For example, an orthogonal sequence having a sequence length of 4 includes [+ 1 + 1 + 1 + 1], [+ 1-1 + 1 + 1], [+ 1 + 1-1-1], [+ 1-1-1 + 1], [+ j + j + j + j ], [+ J−j + j−j], [+ j + j−j−j], or [+ j−j−j + j]. In the second PHICH signal, each modulated symbol is multiplied by an orthogonal sequence, and each signal sequence multiplied by the orthogonal sequence is arranged in a different resource element group.

  FIG. 22 is a diagram illustrating an example of a configuration of a resource element group configured with the second PHICH region. Here, a case is shown in which the second PHICH region is composed of five DL PRB pairs and is composed of the fourth OFDM symbol of the downlink subframe. In order to make the drawing clearly visible, three DL PRB pairs and two DL PRB pairs are not shown consecutively on the vertical axis, but the DL PRB pairs shown in FIG. Note that the DL PRB pair is configured in the system band of the link. In practice, the DL PRB pair shown on the left side of the drawing is a DL PRB pair composed of resources having a frequency lower than that of the DL PRB pair shown on the left side of the drawing. For simplification of description, illustration and description of the downlink reference signal are omitted. Note that a case where one resource element group is composed of four downlink resource elements is shown. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain.

  In the arrangement example of FIG. 22, one resource element group is configured by four downlink resource elements adjacent in the frequency domain. In FIG. 22, downlink resource elements to which the same reference numerals are attached belong to the same resource element group. A resource element group is composed of every four downlink resource elements from the downlink resource element having the lowest frequency. Numbering (index) in order from a resource element group including a downlink resource element having a low frequency (symbol “1”, symbol “2”, symbol “3”, symbol “4”, symbol “5”, symbol “6”, The code “7”, the code “8”, the code “9”, the code “10”, the code “11”, the code “12”, the code “13”, the code “14”, and the code “15”) are performed. As described above, the total number of resource element groups configured in the second PHICH region is determined according to the number of DL PRB pairs and the number of OFDM symbols configuring the second PHICH region.

  One second PHICH signal is arranged in a plurality of resource element groups. The total number of resource element groups configured in the second PHICH region (the total number of resource element groups configured in an OFDM symbol having the second PHICH region) is the resource in which one second PHICH signal is allocated. The value divided by the number of element groups is used as the offset. Here, the offset is used as a difference in index between resource element groups constituting one second PHICH signal. A plurality of resource element groups used for arrangement of the same second PHICH signal respectively correspond to an index obtained by adding an integer multiple of the offset obtained above to the index of the resource element group having the smallest index of the resource element group. It is composed of multiple resource element groups. In other words, the total number of resource element groups configured in the second PHICH region is calculated as the difference in the index (offset) between the resource element groups configuring one second PHICH signal. A value divided by the number of resource element groups in which signals are arranged is used.

  A case where one second PHICH signal is arranged in three resource element groups will be described. An offset of 5 (the total number of resource element groups configured in the second PHICH region) divided by 3 (the number of resource element groups in which one second PHICH signal is arranged) is used as an offset. . A certain second PHICH signal is arranged in resource element group 1, resource element group 6, and resource element group 11. A certain second PHICH signal is arranged in resource element group 2, resource element group 7, and resource element group 12. A certain second PHICH signal is arranged in resource element group 3, resource element group 8, and resource element group 13. A certain second PHICH signal is arranged in the resource element group 4, the resource element group 9, and the resource element group 14. A certain second PHICH signal is arranged in the resource element group 5, the resource element group 10, and the resource element group 15.

  A plurality of second PHICHs arranged in the same resource element group constitute one second PHICH group. Different orthogonal sequences are used to generate each second PHICH signal in the same second PHICH group. For example, one second PHICH group has eight second PHICHs (second PHICH1, second PHICH2, second PHICH3, second PHICH4, second PHICH5, second PHICH6, second Second PHICH7, second PHICH8), and [+1 +1 +1 +1], [+1 +1 +1 -1], [+1 +1 -1 -1], Any orthogonal sequence of [+1 −1 +1 +1], [+ j + j + j + j], [+ j −j + j −j], [+ j + j −j −j], and [+ j −j −j + j] is used. It is done.

  In the example of FIG. 22, five second PHICH groups are configured (second PHICH group 1, second PHICH group 2, second PHICH group 3, second PHICH group 4, second PHICH group 5). The second PHICH group 1 includes a plurality of second PHICHs arranged in the resource element group 1, the resource element group 6, and the resource element group 11. The second PHICH group 2 includes a plurality of second PHICHs arranged in the resource element group 2, the resource element group 7, and the resource element group 12. The second PHICH group 3 includes a plurality of second PHICHs arranged in the resource element group 3, the resource element group 8, and the resource element group 13. The second PHICH group 4 includes a plurality of second PHICHs arranged in the resource element group 4, the resource element group 9, and the resource element group 14. The second PHICH group 5 includes a plurality of second PHICHs arranged in the resource element group 5, the resource element group 10, and the resource element group 15.

  FIG. 23 is a diagram illustrating an example of a configuration of a resource element group configured with the second PHICH region. Here, a case where the second PHICH region is composed of five DL PRB pairs and composed of the third OFDM symbol and the fourth OFDM symbol in the downlink subframe is shown. In order to make the drawing clearly visible, three DL PRB pairs and two DL PRB pairs are not shown consecutively on the vertical axis, but the DL PRB pairs shown in FIG. Note that the DL PRB pair is configured in the system band of the link. In practice, the DL PRB pair shown on the left side of the drawing is a DL PRB pair composed of resources having a frequency lower than that of the DL PRB pair shown on the left side of the drawing. For simplification of description, illustration and description of the downlink reference signal are omitted. Note that a case where one resource element group is composed of four downlink resource elements is shown. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain.

  In the arrangement example of FIG. 23, one resource element group is configured by four downlink resource elements adjacent in the frequency domain. In FIG. 23, the downlink resource elements to which the same reference numerals are attached belong to the same resource element group. A resource element group is composed of every four downlink resource elements from the downlink resource element having the lowest frequency for each OFDM symbol. Numbering (index) in order from a resource element group including a downlink resource element having a low frequency (symbol “1”, symbol “2”, symbol “3”, symbol “4”, symbol “5”, symbol “6”, Code "7", Code "8", Code "9", Code "10", Code "11", Code "12", Code "13", Code "14", Code "15") (Code "16" , “17”, “18”, “19”, “20”, “21”, “22”, “23”, “24”, “25”, “26”. , “27”, “28”, “29”, “30”). This figure shows a case where numbering is performed in order from the resource element group of the fourth OFDM symbol, and then numbering is performed in order from the resource element group of the third OFDM symbol. Numbering may be performed in order from the resource element group, and then numbering may be performed in order from the resource element group of the fourth OFDM symbol.

  In the example of FIG. 23, ten second PHICH groups are configured (second PHICH group 1, second PHICH group 2, second PHICH group 3, second PHICH group 4, second PHICH group 5, second PHICH group 6, second PHICH group 7, second PHICH group 8, second PHICH group 9, second PHICH group 10). The second PHICH group 1 includes a plurality of second PHICHs arranged in the resource element group 1, the resource element group 6, and the resource element group 11. The second PHICH group 2 includes a plurality of second PHICHs arranged in the resource element group 2, the resource element group 7, and the resource element group 12. The second PHICH group 3 includes a plurality of second PHICHs arranged in the resource element group 3, the resource element group 8, and the resource element group 13. The second PHICH group 4 includes a plurality of second PHICHs arranged in the resource element group 4, the resource element group 9, and the resource element group 14. The second PHICH group 5 includes a plurality of second PHICHs arranged in the resource element group 5, the resource element group 10, and the resource element group 15. The second PHICH group 6 includes a plurality of second PHICHs arranged in the resource element group 16, the resource element group 21, and the resource element group 26. The second PHICH group 7 includes a plurality of second PHICHs arranged in the resource element group 17, the resource element group 22, and the resource element group 27. The second PHICH group 8 includes a plurality of second PHICHs arranged in the resource element group 18, the resource element group 23, and the resource element group 28. The second PHICH group 9 includes a plurality of second PHICHs arranged in the resource element group 19, the resource element group 24, and the resource element group 29. The second PHICH group 10 includes a plurality of second PHICHs arranged in the resource element group 20, the resource element group 25, and the resource element group 30.

  FIG. 24 is a diagram illustrating an example of a configuration of a resource element group configured with the second PHICH region. Here, a case where the second PHICH region is composed of five DL PRB pairs and is composed of the third OFDM symbol, the fourth OFDM symbol, and the twelfth OFDM symbol of the downlink subframe. Show. In order to make the drawing clearly visible, three DL PRB pairs and two DL PRB pairs are not shown consecutively on the vertical axis, but the DL PRB pairs shown in FIG. Note that the DL PRB pair is configured in the system band of the link. In practice, the DL PRB pair shown on the left side of the drawing is a DL PRB pair composed of resources having a frequency lower than that of the DL PRB pair shown on the left side of the drawing. For simplification of description, illustration and description of the downlink reference signal are omitted. Note that a case where one resource element group is composed of four downlink resource elements is shown. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain.

  In the arrangement example of FIG. 24, one resource element group is configured by four downlink resource elements adjacent in the frequency domain. In FIG. 24, the downlink resource elements to which the same reference numerals are attached belong to the same resource element group. A resource element group is composed of every four downlink resource elements from the downlink resource element having the lowest frequency for each OFDM symbol. Numbering (index) in order from a resource element group including a downlink resource element having a low frequency (symbol “1”, symbol “2”, symbol “3”, symbol “4”, symbol “5”, symbol “6”, Code "7", Code "8", Code "9", Code "10", Code "11", Code "12", Code "13", Code "14", Code "15") (Code "16" , “17”, “18”, “19”, “20”, “21”, “22”, “23”, “24”, “25”, “26”. , “27”, “28”, “29”, “30”) (“31”, “32”, “33”, “34”, “35”, “36”) ”,“ 37 ”,“ 38 ”,“ 39 ”,“ 40 ”,“ 41 ”, No. "42", code "43", code "44", code "45") is performed. In this figure, numbering is performed sequentially from the resource element group of the fourth OFDM symbol, then numbering is performed sequentially from the resource element group of the third OFDM symbol, and then the resource element of the twelfth OFDM symbol. Although the case where numbering is performed in order from the group will be described, the present invention is not limited to such numbering of resource element groups.

  In the example of FIG. 24, 15 second PHICH groups are configured (second PHICH group 1, second PHICH group 2, second PHICH group 3, second PHICH group 4, second PHICH group 5, second PHICH group 6, second PHICH group 7, second PHICH group 8, second PHICH group 9, second PHICH group 10, second PHICH group 11, second PHICH Group 12, second PHICH group 13, second PHICH group 14, second PHICH group 15).

  The second PHICH group 1 includes a plurality of second PHICHs arranged in the resource element group 1, the resource element group 6, and the resource element group 11. The second PHICH group 2 includes a plurality of second PHICHs arranged in the resource element group 2, the resource element group 7, and the resource element group 12. The second PHICH group 3 includes a plurality of second PHICHs arranged in the resource element group 3, the resource element group 8, and the resource element group 13. The second PHICH group 4 includes a plurality of second PHICHs arranged in the resource element group 4, the resource element group 9, and the resource element group 14. The second PHICH group 5 includes a plurality of second PHICHs arranged in the resource element group 5, the resource element group 10, and the resource element group 15. The second PHICH group 6 includes a plurality of second PHICHs arranged in the resource element group 16, the resource element group 21, and the resource element group 26. The second PHICH group 7 includes a plurality of second PHICHs arranged in the resource element group 17, the resource element group 22, and the resource element group 27. The second PHICH group 8 includes a plurality of second PHICHs arranged in the resource element group 18, the resource element group 23, and the resource element group 28. The second PHICH group 9 includes a plurality of second PHICHs arranged in the resource element group 19, the resource element group 24, and the resource element group 29. The second PHICH group 10 includes a plurality of second PHICHs arranged in the resource element group 20, the resource element group 25, and the resource element group 30. The second PHICH group 11 includes a plurality of second PHICHs arranged in the resource element group 31, the resource element group 36, and the resource element group 41. The second PHICH group 12 includes a plurality of second PHICHs arranged in the resource element group 32, the resource element group 37, and the resource element group 42. The second PHICH group 13 includes a plurality of second PHICHs arranged in the resource element group 33, the resource element group 38, and the resource element group 43. The second PHICH group 14 includes a plurality of second PHICHs arranged in the resource element group 34, the resource element group 39, and the resource element group 44. The second PHICH group 15 includes a plurality of second PHICHs arranged in the resource element group 35, the resource element group 40, and the resource element group 45.

  As described above, the number of the second PHICH group and the number of the second PHICH are determined according to the number of DL PRB pairs and the number of OFDM symbols constituting the second PHICH region. Therefore, the base station apparatus 3 controls the number of second PHICH regions, the number of DL PRB pairs constituting the second PHICH region, and the number of OFDM symbols, thereby controlling the number of second PHICH groups used in the cell. The number, the number of the second PHICH can be controlled.

  In the above description, the case where one second PHICH group is composed of a plurality of resource element groups of the same OFDM symbol has been described, but may be composed of a plurality of resource element groups of different OFDM symbols. Good.

  For example, description will be made using an example of the configuration of the resource element group configured by the second PHICH region illustrated in FIG. The second PHICH group 1 includes a plurality of second PHICHs arranged in the resource element group 1, the resource element group 21, and the resource element group 41. The second PHICH group 2 includes a plurality of second PHICHs arranged in the resource element group 2, the resource element group 22, and the resource element group 42. The second PHICH group 3 includes a plurality of second PHICHs arranged in the resource element group 3, the resource element group 23, and the resource element group 43. The second PHICH group 4 includes a plurality of second PHICHs arranged in the resource element group 4, the resource element group 24, and the resource element group 44. The second PHICH group 5 includes a plurality of second PHICHs arranged in the resource element group 5, the resource element group 25, and the resource element group 45. The second PHICH group 6 includes a plurality of second PHICHs arranged in the resource element group 6, the resource element group 26, and the resource element group 31. The second PHICH group 7 includes a plurality of second PHICHs arranged in the resource element group 7, the resource element group 27, and the resource element group 32. The second PHICH group 8 includes a plurality of second PHICHs arranged in the resource element group 8, the resource element group 28, and the resource element group 33. The second PHICH group 9 includes a plurality of second PHICHs arranged in the resource element group 9, the resource element group 29, and the resource element group 34. The second PHICH group 10 includes a plurality of second PHICHs arranged in the resource element group 10, the resource element group 30, and the resource element group 35. The second PHICH group 11 includes a plurality of second PHICHs arranged in the resource element group 11, the resource element group 16, and the resource element group 36. The second PHICH group 12 includes a plurality of second PHICHs arranged in the resource element group 12, the resource element group 17, and the resource element group 37. The second PHICH group 13 includes a plurality of second PHICHs arranged in the resource element group 13, the resource element group 18, and the resource element group 38. The second PHICH group 14 includes a plurality of second PHICHs arranged in the resource element group 14, the resource element group 19, and the resource element group 39. The second PHICH group 15 includes a plurality of second PHICHs arranged in the resource element group 15, the resource element group 20, and the resource element group 40.

  Information indicating the configuration (designation, setting) of the second PHICH region is exchanged between the base station device 3 and the mobile station device 5 before starting communication using the second PHICH. For example, the information is performed using RRC signaling. Specifically, the mobile station apparatus 5 receives information indicating the position (allocation) of the DL PRB pair in the second PHICH area and information indicating the number of OFDM symbols in the second PHICH area from the base station apparatus 3. . Information indicating the position of the OFDM symbol in the second PHICH region may be exchanged between the base station apparatus 3 and the mobile station apparatus 5. Note that information indicating the number of OFDM symbols in the second PHICH region is not exchanged directly (explicitly), but other information is exchanged, and the mobile station apparatus 5 performs the second communication based on the information. The number of OFDM symbols in the PHICH region may be recognized (implicitly). Information indicating the configuration of resource element groups constituting one second PHICH group (configured by a plurality of resource element groups of the same OFDM symbol or configured by a plurality of resource element groups of different OFDM symbols) May be notified from the base station apparatus 3 to the mobile station apparatus 5.

  Note that the mobile station apparatus 5 uses a predetermined method to determine which second PHICH signal in the second PHICH region is demodulated in order to acquire ACK / NACK information for data transmitted in the uplink. Recognize with. For example, the mobile station device 5 demodulates any second PHICH signal based on the UL PRB (UL PRB index having the smallest number used for data transmission) used in the PUSCH used for data transmission. Recognize. For example, the mobile station apparatus 5 uses the UL PRB (UL PRB index with the smallest number used for data transmission) used in the PUSCH used for data transmission and the DCI format (cyclic signal applied to the PUSCH reference signal). Which second PHICH signal is to be demodulated on the basis of the shift information). For example, the mobile station apparatus 5 detects the second PDCCH (the E-CCE index with the smallest number used for the detected second PDCCH or the detected second PDCCH, which includes information on the allocation of PUSCH resources used for data transmission) Based on the E-CCE index having the highest number used for the second PDCCH, it is recognized which of the second PHICH signals is to be demodulated. For example, the mobile station apparatus 5 recognizes which second PHICH signal is to be demodulated based on RRC signaling (information indicating the second PHICH signal directly) notified from the base station apparatus 3. To do. For example, the mobile station apparatus 5 receives RRC signaling (information indicating a plurality of second PHICH signal candidates) notified from the base station apparatus 3 and DCI format (a plurality of second PHICH indicated by the RRC signaling). Which second PHICH signal is to be demodulated on the basis of information indicating one of the signal candidates).

  The second PHICH region is preferably configured in part or all of the second PDCCH region to which the second physical resource mapping is applied. In other words, it is desirable that the second PHICH region is configured by a part of the second PDCCH region to which the second physical resource mapping is applied or all DL PRB pairs. Preferably, the plurality of DL PRB pairs constituting the second PDCCH region to which the second physical resource mapping is applied are composed of DL PRB pairs distributed in the frequency domain. Therefore, by configuring the second PHICH region in the second PDCCH region to which the second physical resource mapping is applied, frequency diversity can be realized for the second PHICH.

  The UE-specific RS used by the mobile station device 5 for demodulation of the second PHICH signal is determined in advance before performing the second PHICH communication. In the second PHICH region, any antenna port is used as a common antenna port corresponding to each resource element group in the DL PRB pair. Any antenna port may be set (configured) from among a plurality of antenna ports for each second PHICH region. For example, the antenna port 7 is used, the signal of each resource element group in the DL PRB pair is transmitted from the antenna port 7, and the mobile station apparatus 5 uses the UE-specific RS of the antenna port 7 in the DL PRB pair as a resource. Demodulate the element group signal (propagation path compensation). For example, the antenna port 8 is used, the signal of each resource element group in the DL PRB pair is transmitted from the antenna port 8, and the mobile station device 5 uses the UE-specific RS of the antenna port 8 in the DL PRB pair to perform resource transmission. Demodulate the element group signal (propagation path compensation). A second PHICH region composed of the same DL PRB pair is set in the plurality of mobile station apparatuses 5, and UE-specific RSs of different antenna ports are set in the respective mobile station apparatuses 5, whereby the second PHICH MU-MIMO is realized.

  Also, a UE-specific RS antenna used for demodulation of an E-CCE signal in a second PDCCH region to which a second physical resource mapping is applied, in which a second PHICH region is configured in the internal DL PRB pair The UE-specific RS of the same antenna port as the port may be used for demodulating the second PHICH signal. In other words, in the mobile station apparatus 5 in which the second PDCCH region to which the second physical resource mapping is applied and the second PHICH region are set, an E-CCE signal (Distributed E-) in a certain DL PRB pair The UE-specific RS used for demodulation of the PDCCH E-CCE signal) and the second PHICH resource element group signal may be a UE-specific RS of a common antenna port. As a result, there is no need to indicate information indicating the antenna port of the UE-specific RS used for signal demodulation for each of the second PDCCH and the second PHICH, and the amount of signaling used for information notification increases. Can be avoided. As a result, it is possible to avoid an increase in the number of UE-specific RSs (antenna ports of the UE-specific RS) that need to be arranged in the DL PRB pair, and to avoid an increase in the overhead of the UE-specific RS. Can do. Therefore, a decrease in system capacity can be avoided.

  FIG. 25 is a diagram explaining the second PDCCH monitoring of the mobile station apparatus 5 according to the embodiment of the present invention. A plurality of second PDCCH regions (second PDCCH region 1 and second PDCCH region 2) are configured for mobile station apparatus 5. In the mobile station apparatus 5, a search space is set in each second PDCCH region. The search space means a logical area in which the mobile station device 5 performs decoding detection of the second PDCCH within the second PDCCH area. The Search space is composed of a plurality of second PDCCH candidates. The second PDCCH candidate is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH. For each E-CCE aggregation number, different second PDCCH candidates are composed of different E-CCEs (including one E-CCE and a plurality of E-CCEs). The E-CCEs constituting the plurality of second PDCCH candidates of the search space set in the second PDCCH region to which the first physical resource mapping is applied are a plurality of E-CCEs having consecutive E-CCE numbers. is there. The E-CCEs constituting the plurality of second PDCCH candidates of the search space set in the second PDCCH region to which the second physical resource mapping is applied are a plurality of non-consecutive E-CCEs having E-CCE numbers. It is. The first E-CCE number used for the search space in the second PDCCH region is set for each mobile station apparatus 5. For example, the first E-CCE number used for the search space is set by a random function using an identifier (mobile station identifier) assigned to the mobile station device 5. For example, the base station apparatus 3 notifies the mobile station apparatus 5 of the first E-CCE number used for the search space using RRC signaling.

  A plurality of search spaces (first search space, second search space) are set in the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured. The first physical resource mapping is applied to some second PDCCH regions (second PDCCH region 1) of the plurality of second PDCCH regions configured in the mobile station device 5, and different second parts The second physical resource mapping is applied to the PDCCH region (second PDCCH region 2). The first Search space is the Search space of the second PDCCH region 1, and the second Search space is the Search space of the second PDCCH region 2.

  The number of second PDCCH candidates for the first Search space may be different from the number of second PDCCH candidates for the second Search space. For example, when the second PDCCH to which the precoding process is basically applied is used, and the realization of the precoding process more suitable for some situation is difficult in the base station apparatus 3, the precoding process is not applied and the frequency In order to perform control such that the second PDCCH having the diversity effect is used, the number of second PDCCH candidates in the first Search space is set to be larger than the number of second PDCCH candidates in the second Search space. May be.

  In addition, in a certain number of E-CCE sets, the number of second PDCCH candidates in the first Search space is the same as the number of second PDCCH candidates in the second Search space. The number of second PDCCH candidates for the first Search space and the number of second PDCCH candidates for the second Search space may be different. Further, in a certain number of E-CCE sets, the number of second PDCCH candidates in the first Search space is larger than the number of second PDCCH candidates in the second Search space, and in the number of different E-CCE sets, The number of second PDCCH candidates in the second search space may be smaller than the number of second PDCCH candidates in the second search space.

  In addition, the second PDCCH candidate for a certain number of E-CCE sets may be set in the search space of one second PDCCH region and may not be set in the search space of one different second PDCCH region. it can.

  Further, the second number of PDCCH candidates in the search space in one second PDCCH region can be changed according to the number of second PDCCH regions configured in the mobile station apparatus 5. For example, as the number of second PDCCH regions configured in the mobile station device 5 increases, the number of second PDCCH candidates for the search space in one second PDCCH region is decreased.

  In the search space of the second PDCCH region to which the second physical resource mapping is applied, the mobile station device 5 uses the first PDCCH from the resource of the DL PRB pair in the DL PRB pair in which the second PHICH region is configured. , Using an E-CCE signal configured by excluding resources in a region where the first PHICH can be arranged, resources in a region where a downlink reference signal is arranged, and resources in the second PHICH region, In the DL PRB pair in which the second PDCCH signal is decoded and detected and the second PHICH region is not configured, the first PDCCH and the resources in the region where the first PHICH can be arranged from the DL PRB pair resource , Except for resources in the area where downlink reference signals are allocated Using signals E-CCE, it performs a process of decoding detected signals of the second PDCCH.

<Overall configuration of base station apparatus 3>
Hereinafter, the configuration of the base station apparatus 3 according to the present embodiment will be described with reference to FIGS. 1, 2, and 3. FIG. 1 is a schematic block diagram showing the configuration of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the base station apparatus 3 includes a reception processing unit (second reception processing unit) 101, a radio resource control unit (second radio resource control unit) 103, and a control unit (second control unit). 105 and a transmission processing unit (second transmission processing unit) 107.

  The reception processing unit 101 demodulates and decodes the received signals of PUCCH and PUSCH received from the mobile station apparatus 5 by the reception antenna 109 using the UL RS according to an instruction from the control unit 105, and obtains control information and information data. Extract. The reception processing unit 101 performs a process of extracting UCI from an uplink subframe, UL PRB, to which the own apparatus assigns PUCCH resources to the mobile station apparatus 5. The reception processing unit 101 is instructed from the control unit 105 what processing is to be performed on which uplink subframe and which UL PRB. For example, the reception processing unit 101 multiplies and combines a code sequence in the time domain and a code sequence in the frequency domain for a PUCCH (PUCCH format 1a, PUCCH format 1b) signal for ACK / NACK. A detection process to be performed is instructed from the control unit 105. Reception processing section 101 is instructed by control section 105 to use a frequency-domain code sequence and / or a time-domain code series used for processing for detecting UCI from PUCCH. The reception processing unit 101 outputs the extracted UCI to the control unit 105 and outputs information data to the upper layer. Details of the reception processing unit 101 will be described later.

  Also, the reception processing unit 101 detects (receives) a preamble sequence from the received PRACH signal received from the mobile station apparatus 5 by the reception antenna 109 in accordance with an instruction from the control unit 105. The reception processing unit 101 also estimates arrival timing (reception timing) along with detection of the preamble sequence. The reception processing unit 101 performs processing for detecting a preamble sequence for an uplink subframe, UL PRB pair, to which the device itself has assigned PRACH resources. The reception processing unit 101 outputs information regarding the estimated arrival timing to the control unit 105.

  Also, the reception processing unit 101 measures the channel quality of one or more UL PRBs (UL PRB pairs) using the SRS received from the mobile station apparatus 5. Also, the reception processing unit 101 detects (calculates and measures) an uplink synchronization shift using the SRS received from the mobile station apparatus 5. The reception processing unit 101 is instructed from the control unit 105 as to which uplink subframe and which UL PRB (UL PRB pair) to perform. The reception processing unit 101 outputs information regarding the measured channel quality and the detected uplink synchronization shift to the control unit 105. Details of the reception processing unit 101 will be described later.

  The radio resource control unit 103 allocates resources to PHICH (first PHICH, second PHICH), allocates resources to PDCCH (first PDCCH, second PDCCH), allocates resources to PUCCH, and DLs to PDSCH PRB pair allocation, UL PRB pair allocation to PUSCH, resource allocation to PRACH, resource allocation to SRS, modulation scheme, coding rate, transmission power control value, phase rotation amount used for precoding processing (weighting) Value), a phase rotation amount (weighting value) used for precoding processing of UE-specific RS, and the like are set. Radio resource control section 103 also sets a frequency domain code sequence, a time domain code sequence, and the like for PUCCH.

  Also, the radio resource control unit 103 sets one or more second PHICH areas, and sets DL PRB pairs and OFDM symbols used for the respective second PHICH areas. Moreover, the radio | wireless resource control part 103 sets several 2nd PDCCH area | regions, and sets DL PRB pair used for each 2nd PDCCH area | region. Also, the radio resource control unit 103 sets physical resource mapping for each second PDCCH region. Moreover, the radio | wireless resource control part 103 sets the antenna port corresponding to the resource element group in DL PRB pair with respect to the 2nd PHICH area | region. Specifically, the radio resource control unit 103 sets a transmission antenna that transmits a resource element group signal used for the second PHICH in the DL PRB pair. Moreover, the radio | wireless resource control part 103 sets the antenna port corresponding to E-CCE in DL PRB pair with respect to the 2nd PDCCH area | region where 2nd physical resource mapping is applied. Specifically, the radio resource control unit 103 sets a transmission antenna that transmits an E-CCE signal in the DL PRB pair. Moreover, the radio | wireless resource control part 103 sets the combination with each antenna port corresponding to each E-CCE in DL PRB pair with respect to the 2nd PDCCH area | region where 1st physical resource mapping is applied. Specifically, the radio resource control unit 103 sets a transmission antenna that transmits a signal of each E-CCE in the DL PRB pair.

  A part of the information set in the radio resource control unit 103 is notified to the mobile station device 5 via the transmission processing unit 107, for example, information indicating the DL PRB pair of the second PHICH region, the information of the second PHICH region Information indicating an OFDM symbol, information indicating an antenna port corresponding to a resource element group in the second PHICH region, information indicating a DL PRB pair in the second PDCCH region, information indicating physical resource mapping in the second PDCCH region ( Information indicating the first physical resource mapping or the second physical resource mapping), information indicating the combination of each E-CCE in the DL PRB pair and the corresponding antenna port (first combination, second combination, 3rd combination or 4th combination) is notified to the mobile station apparatus 5. It is.

  Also, the radio resource control unit 103 sets PDSCH radio resource allocation and the like based on the UCI acquired by the reception processing unit 101 using the PUCCH and input via the control unit 105. For example, when ACK / NACK acquired using PUCCH is input, radio resource control section 103 assigns PDSCH resources for which NACK is indicated by ACK / NACK to mobile station apparatus 5.

  The radio resource control unit 103 outputs various control signals to the control unit 105. For example, the control signal includes a control signal indicating a transmission antenna that transmits a signal of a resource element group in the DL PRB pair of the second PHICH region, a control signal indicating resource allocation of the second PHICH, and a second PDCCH region A control signal indicating a physical resource mapping, a control signal indicating a transmission antenna for transmitting each E-CCE signal in the DL PRB pair of the second PDCCH region, a control signal indicating an allocation of resources of the second PDCCH, It is a control signal indicating the amount of phase rotation used for coding processing.

  Based on the control signal input from the radio resource control unit 103, the control unit 105 allocates a DL PRB pair to the PDSCH, allocates resources to the PDCCH, allocates resources to the PHICH, sets a modulation scheme for the PDSCH, and controls the PDSCH and PDCCH. Setting of coding rate (E-CCE aggregation number of second PDCCH), setting of UE-specific RS in second PDCCH region, setting of transmitting antenna for transmitting E-CCE signal, setting of second PHICH region UE-specific RS configuration, transmit antenna configuration for transmitting second PHICH resource element group signal, PDSCH and PDCCH and PHICH and UE-specific R The control such as setting of the pre-coding process is performed with respect to the transmission processing unit 107 for.

  Also, the control unit 105 generates DCI transmitted using the PDCCH based on the control signal input from the radio resource control unit 103 and outputs the DCI to the transmission processing unit 107. Further, the control unit 105 generates ACK / NACK transmitted using PHICH based on the uplink data received by the reception processing unit 101, and outputs the ACK / NACK to the transmission processing unit 107. The DCI transmitted using the PDCCH is a downlink assignment, an uplink grant, or the like. Further, the control unit 105 includes information indicating the second PHICH region, information indicating the antenna port corresponding to the resource element group used for the second PHICH in the DL PRB pair, information indicating the second PDCCH region, Information indicating physical resource mapping of the second PDCCH region, information indicating a combination of each E-CCE and corresponding antenna port in the DL PRB pair (first combination, second combination, third combination, or first And the like are transmitted to the mobile station apparatus 5 using the PDSCH via the transmission processing unit 107.

  The control unit 105, based on the control signal input from the radio resource control unit 103, allocation of UL PRB pair to PUSCH, resource allocation to PUCCH, PUSCH and PUCCH modulation scheme setting, PUSCH coding rate setting, Control such as detection processing for PUCCH, setting of a code sequence for PUCCH, allocation of resources for PRACH, allocation of resources for SRS, and the like is performed on reception processing section 101. In addition, the control unit 105 receives the UCI transmitted from the mobile station apparatus 5 using PUCCH from the reception processing unit 101 and outputs the input UCI to the radio resource control unit 103.

  Further, the control unit 105 receives information indicating the arrival timing of the detected preamble sequence and information indicating the uplink synchronization shift detected from the received SRS from the reception processing unit 101, and transmits the uplink transmission timing. (TA: Timing Advance, Timing Adjustment, Timing Alignment) (TA value) is calculated. Information (TA command) indicating the calculated uplink transmission timing adjustment value is notified to the mobile station apparatus 5 via the transmission processing unit 107.

  The transmission processing unit 107 generates a signal to be transmitted using PHICH, PDCCH, and PDSCH based on the control signal input from the control unit 105, and transmits the signal via the transmission antenna 111. The transmission processing unit 107 receives information indicating the second PHICH region, information indicating the antenna port corresponding to the resource element group used for the second PHICH in the DL PRB pair, input from the radio resource control unit 103, Information indicating the second PDCCH region, information indicating the physical resource mapping of the second PDCCH region, information indicating the combination of each E-CCE in the DL PRB pair and the corresponding antenna port (first combination, second Combination, third combination, or fourth combination), information data or the like input from an upper layer is transmitted to the mobile station apparatus 5 using PDSCH, and DCI input from the control unit 105 is transmitted to PDCCH ( The first PDCCH and the second PDCCH) are transmitted to the mobile station apparatus 5 and controlled. PHICH The ACK / NACK for the uplink data which is input from 105 (the first PHICH, a second PHICH) for transmitting to the mobile station apparatus 5 by using the. Moreover, the transmission process part 107 transmits CRS, UE-specific RS, and CSI-RS. For the sake of simplification of explanation, hereinafter, the information data is assumed to include information on several types of control. Details of the transmission processing unit 107 will be described later.

<Configuration of transmission processing unit 107 of base station apparatus 3>
Hereinafter, details of the transmission processing unit 107 of the base station apparatus 3 will be described. FIG. 2 is a schematic block diagram showing the configuration of the transmission processing unit 107 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 107 includes a plurality of physical downlink shared channel processing units 201-1 to 201-M (hereinafter referred to as physical downlink shared channel processing units 201-1 to 201-M). Physical downlink), a plurality of physical downlink control channel processing units 203-1 to 203-M (hereinafter, physical downlink control channel processing units 203-1 to 203-M are combined). A plurality of physical hybrid ARQ indicator channel processing units 233-1 to 233 -M (hereinafter referred to as physical hybrid ARQ indicator channel processing units 233-1 to 233 -M together), and a physical hybrid ARQ indicator channel. And the downlink pilot channel processing unit 2). 5. Precoding processing unit 231, multiplexing unit 207, IFFT (Inverse Fast Fourier Transform) unit 209, GI (Guard Interval) insertion unit 211, D / A (Digital / Analog converter) It includes a conversion unit 213, a transmission RF (Radio Frequency) unit 215, and a transmission antenna 111. Note that each physical downlink shared channel processing unit 201, each physical downlink control channel processing unit 203, and each physical Hybrid ARQ indicator channel processing unit 233 have the same configuration and function, and thus represent one of them. I will explain. For simplicity of explanation, it is assumed that the transmission antenna 111 is a collection of a plurality of antenna ports (antenna ports 0 to 22).

  As shown in this figure, the physical downlink shared channel processing unit 201 includes a turbo coding unit 219, a data modulation unit 221 and a precoding processing unit 229, respectively. Also, as shown in this figure, the physical downlink control channel processing unit 203 includes a convolutional coding unit 223, a QPSK modulation unit 225, and a precoding processing unit 227. Also, as shown in this figure, physical Hybrid ARQ indicator channel processing section 233 includes ACK / NACK coding section 235, BPSK modulation section 237, orthogonal sequence multiplication section 239, and precoding processing section 241.

  The physical downlink shared channel processing unit 201 performs baseband signal processing for transmitting information data to the mobile station apparatus 5 by the OFDM method. The turbo encoding unit 219 performs turbo encoding for increasing the error tolerance of the data at the encoding rate input from the control unit 105 and outputs the input information data to the data modulation unit 221. The data modulation unit 221 uses the data encoded by the turbo coding unit 219 as a modulation method inputted from the control unit 105, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16-value quadrature amplitude modulation). Modulation with a modulation scheme such as 16 Quadrature Amplitude Modulation) or 64QAM (64 Quadrature Amplitude Modulation) to generate a signal sequence of modulation symbols. The data modulation unit 221 outputs the generated signal sequence to the precoding processing unit 229. Precoding processing section 229 performs precoding processing (beamforming processing) on the signal input from data modulation section 221 and outputs the result to multiplexing section 207. Here, the precoding process performs phase rotation or the like on the generated signal so that the mobile station apparatus 5 can efficiently receive (for example, the interference is minimized so that the reception power is maximized). Preferably it is done. Note that the precoding processing unit 229 outputs the signal input from the data modulation unit 221 to the multiplexing unit 207 as it is when the precoding process is not performed on the signal input from the data modulation unit 221.

  The physical downlink control channel processing unit 203 performs baseband signal processing for transmitting the DCI input from the control unit 105 in the OFDM scheme. The convolutional coding unit 223 performs convolutional coding for increasing DCI error tolerance based on the coding rate input from the control unit 105. Here, DCI is controlled in bit units. Note that the coding rate of DCI transmitted on the second PDCCH is related to the set E-CCE aggregation number. The convolutional coding unit 223 also performs rate matching to adjust the number of output bits for the bits subjected to the convolutional coding processing based on the coding rate input from the control unit 105. The convolutional coding unit 223 outputs the encoded DCI to the QPSK modulation unit 225. The QPSK modulation unit 225 modulates the DCI encoded by the convolutional coding unit 223 using the QPSK modulation method, and outputs the modulated modulation symbol signal sequence to the precoding processing unit 227. Precoding processing section 227 performs precoding processing on the signal input from QPSK modulation section 225 and outputs the result to multiplexing section 207. Note that the precoding processing unit 227 can output the signal input from the QPSK modulation unit 225 to the multiplexing unit 207 without performing precoding processing.

  The physical hybrid ARQ indicator channel processing unit 233 performs baseband signal processing for transmitting the ACK / NACK input from the control unit 105 in the OFDM scheme. The ACK / NACK encoding unit 235 performs encoding on the ACK / NACK information bits input from the control unit 105. The ACK / NACK encoding unit 235 generates a code word according to the information bits of ACK / NACK. The ACK / NACK encoding unit 235 generates a code word of any one of two code words consisting of <0, 0, 0> or <1, 1, 1>. The ACK / NACK encoding unit 235 generates a code word of <0, 0, 0> when the input ACK / NACK is ACK, and <1, 1, 1 when the input ACK / NACK is NACK. > Is generated. The ACK / NACK encoding unit 235 outputs the generated codeword to the BPSK modulation unit 237. The BPSK modulation unit 237 modulates the codeword generated by the ACK / NACK coding unit 235 using the BPSK modulation method, and outputs the modulated modulation symbol signal sequence to the orthogonal sequence multiplication unit 239. Orthogonal sequence multiplication section 239 multiplies each of the modulation symbols input from BPSK modulation section 237 by the orthogonal sequence instructed by control section 105 and outputs a signal obtained by multiplying the orthogonal sequence to precoding processing section 241. To do. The precoding processing unit 241 performs precoding processing on the signal input from the orthogonal sequence multiplication unit 239 based on an instruction from the control unit 105 and outputs the signal to the multiplexing unit 207.

  The downlink pilot channel processing unit 205 generates a downlink reference signal (CRS, UE-specific RS, CSI-RS) that is a known signal in the mobile station apparatus 5 and outputs the downlink reference signal (CRS, UE-specific RS, CSI-RS) to the precoding processing unit 231. The precoding processing unit 231 does not perform precoding processing on the CRS, CSI-RS, and some UE-specific RSs input from the downlink pilot channel processing unit 205 and outputs the CRS, CSI-RS, and some UE-specific RSs to the multiplexing unit 207. For example, a UE-specific RS for which precoding processing is not performed in the precoding processing unit 231 is a UE-specific RS in a DL PRB pair used for the second PDCCH in the second PDCCH region of the second physical resource mapping. It is. For example, the UE-specific RS that is not subjected to the precoding process in the precoding processing unit 231 is a UE-specific RS in the DL PRB pair of the second PHICH region. Precoding processing section 231 performs precoding processing on a part of UE-specific RSs input from downlink pilot channel processing section 205 and outputs the result to multiplexing section 207. For example, the UE-specific RS for which precoding processing is performed in the precoding processing unit 231 is a UE-specific RS in the DL PRB pair used for the second PDCCH in the second PDCCH region of the first physical resource mapping. is there. Note that the precoding processing unit 231 may perform precoding processing on the UE-specific RS in the DL PRB pair used for the second PDCCH in the second PDCCH region of the second physical resource mapping. . Note that the precoding processing unit 231 may perform precoding processing on the UE-specific RS in the DL PRB pair in the second PHICH region. For example, a precoding process common in the DL PRB pair of the second PHICH region is performed on the UE-specific RS.

  The precoding processing unit 231 performs processing performed on the PDSCH in the precoding processing unit 229 and / or processing performed on the second PDCCH in the precoding processing unit 227 and / or second PHICH in the precoding processing unit 241. The same processing as that performed in the above is performed for some UE-specific RSs. For example, the precoding processing unit 231 performs the same precoding processing for the UE-specific RS corresponding to each E-CCE and antenna port. Therefore, when demodulating the second PDCCH signal to which the precoding process is applied in the mobile station apparatus 5, the UE-specific RS changes the propagation path (transmission path) in the downlink and the phase by the precoding processing unit 227. It can be used to estimate an equalization channel with rotation. That is, the base station device 3 does not need to notify the mobile station device 5 of information (phase rotation amount) of the precoding processing by the precoding processing unit 227, and the mobile station device 5 Can be demodulated. Further, when demodulating the second PHICH signal to which the precoding process is applied in the mobile station apparatus 5, the UE-specific RS performs propagation path (transmission path) fluctuation in the downlink and the phase by the precoding processing unit 241. It can be used to estimate an equalization channel with rotation. That is, the base station device 3 does not need to notify the mobile station device 5 of information (phase rotation amount) of the precoding processing by the precoding processing unit 241, and the mobile station device 5 Can be demodulated.

  In some cases, the UE-specific RS is not subjected to precoding processing, and the UE-specific RS is used for demodulation of a signal for which precoding processing is not performed. In addition, when the precoding process is not used for the PDSCH, the second PDCCH, and the second PHICH in which demodulation processing such as propagation path compensation is performed using the UE-specific RS, the precoding processing unit 231 includes the UE -It outputs to the multiplexing part 207, without performing a precoding process with respect to specific RS. Similarly, when the precoding process is not performed on the second PHICH, the precoding processing unit 241 does not perform the precoding process on the signal of the resource element group and outputs the signal to the multiplexing unit 207.

  Multiplexer 207 receives a signal input from downlink pilot channel processor 205, a signal input from each physical downlink shared channel processor 201, and a signal input from each physical downlink control channel processor 203. The signal input from each of the physical hybrid ARQ indicator channel processing unit 233 is multiplexed into a downlink subframe in accordance with an instruction from the control unit 105. Allocation of DL PRB pair to PDSCH set by radio resource control section 103, allocation of resources to PDCCH (first PDCCH, second PDCCH), allocation of resources to PHICH (first PHICH, second PHICH) Then, a control signal related to physical resource mapping in the second PDCCH region is input to the control unit 105, and the control unit 105 controls processing of the multiplexing unit 207 based on the control signal. For example, as illustrated in FIG. 22, the multiplexing unit 207 multiplexes the second PHICH signal with a downlink resource. For example, the multiplexing unit 207 multiplexes the second PDCCH signal with the downlink resource using the E-CCE aggregation number set by the radio resource control unit 103. The multiplexing unit 207 outputs the multiplexed signal to the IFFT unit 209.

  IFFT section 209 performs fast inverse Fourier transform on the signal multiplexed by multiplexing section 207, performs OFDM modulation, and outputs the result to GI insertion section 211. The GI insertion unit 211 generates a baseband digital signal including symbols in the OFDM scheme by adding a guard interval to the signal modulated by the OFDM scheme by the IFFT unit 209. As is well known, the guard interval is generated by duplicating a part of the head or tail of the OFDM symbol to be transmitted. The GI insertion unit 211 outputs the generated baseband digital signal to the D / A unit 213. The D / A unit 213 converts the baseband digital signal input from the GI insertion unit 211 into an analog signal and outputs the analog signal to the transmission RF unit 215. The transmission RF unit 215 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 213, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF section 215 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits to the mobile station apparatus 5 via the transmission antenna 111. Send.

<Configuration of Reception Processing Unit 101 of Base Station Device 3>
Hereinafter, details of the reception processing unit 101 of the base station apparatus 3 will be described. FIG. 3 is a schematic block diagram showing the configuration of the reception processing unit 101 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 101 includes a reception RF unit 301, an A / D (Analog / Digital converter) unit 303, a symbol timing detection unit 309, a GI removal unit 311, an FFT unit 313, a sub Carrier demapping section 315, propagation path estimation section 317, PUSCH propagation path equalization section 319, PUCCH propagation path equalization section 321, IDFT section 323, data demodulation section 325, turbo decoding section 327, physical uplink control A channel detection unit 329, a preamble detection unit 331, and an SRS processing unit 333 are included.

  The reception RF unit 301 appropriately amplifies the signal received by the reception antenna 109, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and amplifies the signal level so that the signal level is appropriately maintained. The level is controlled, and quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal. The reception RF unit 301 outputs the quadrature demodulated analog signal to the A / D unit 303. The A / D unit 303 converts the analog signal quadrature demodulated by the reception RF unit 301 into a digital signal, and outputs the converted digital signal to the symbol timing detection unit 309 and the GI removal unit 311.

  The symbol timing detection unit 309 detects the symbol timing based on the signal input from the A / D unit 303, and outputs a control signal indicating the detected symbol boundary timing to the GI removal unit 311. The GI removal unit 311 removes a portion corresponding to the guard interval from the signal input from the A / D unit 303 based on the control signal from the symbol timing detection unit 309, and converts the remaining portion of the signal to the FFT unit 313. Output to. The FFT unit 313 performs fast Fourier transform on the signal input from the GI removal unit 311, performs demodulation of the DFT-Spread-OFDM scheme, and outputs the result to the subcarrier demapping unit 315. Note that the number of points in the FFT unit 313 is equal to the number of points in the IFFT unit of the mobile station apparatus 5 described later.

  The subcarrier demapping unit 315 separates the signal demodulated by the FFT unit 313 into DM RS, SRS, PUSCH signal, and PUCCH signal based on the control signal input from the control unit 105. The subcarrier demapping unit 315 outputs the separated DM RS to the propagation path estimation unit 317, outputs the separated SRS to the SRS processing unit 333, and sends the separated PUSCH signal to the PUSCH propagation path equalization unit 319. And outputs the separated PUCCH signal to the PUCCH channel equalization unit 321.

  The propagation path estimation unit 317 estimates propagation path fluctuations using the DM RS separated by the subcarrier demapping unit 315 and a known signal. The propagation path estimation unit 317 outputs the estimated propagation path estimation value to the PUSCH propagation path equalization unit 319 and the PUCCH propagation path equalization unit 321. The PUSCH channel equalization unit 319 equalizes the amplitude and phase of the PUSCH signal separated by the subcarrier demapping unit 315 based on the channel estimation value input from the channel estimation unit 317. Here, equalization refers to a process for restoring the fluctuation of the propagation path received by the signal during wireless communication. The PUSCH channel equalization unit 319 outputs the adjusted signal to the IDFT unit 323.

  The IDFT unit 323 performs discrete inverse Fourier transform on the signal input from the PUSCH channel equalization unit 319 and outputs the result to the data demodulation unit 325. The data demodulating unit 325 demodulates the PUSCH signal converted by the IDFT unit 323, and outputs the demodulated PUSCH signal to the turbo decoding unit 327. This demodulation is demodulation corresponding to the modulation method used in the data modulation unit of the mobile station apparatus 5, and the modulation method is input from the control unit 105. The turbo decoding unit 327 decodes information data from the PUSCH signal input from the data demodulation unit 325 and demodulated. The coding rate is input from the control unit 105.

  The PUCCH channel equalization unit 321 equalizes the amplitude and phase of the PUCCH signal separated by the subcarrier demapping unit 315 based on the channel estimation value input from the channel estimation unit 317. The PUCCH channel equalization unit 321 outputs the equalized signal to the physical uplink control channel detection unit 329.

  The physical uplink control channel detection unit 329 demodulates and decodes the signal input from the PUCCH channel equalization unit 321 and detects UCI. The physical uplink control channel detection unit 329 performs processing for separating a signal code-multiplexed in the frequency domain and / or the time domain. The physical uplink control channel detection unit 329 detects ACK / NACK, SR, CQI from the PUCCH signal code-multiplexed in the frequency domain and / or time domain using the code sequence used on the transmission side. Process. Specifically, the physical uplink control channel detection unit 329 performs a detection process using a code sequence in the frequency domain, that is, a process for separating a code-multiplexed signal in the frequency domain, for each PUCCH subcarrier signal. On the other hand, after multiplying each code of the code sequence, a signal multiplied by each code is synthesized. Specifically, the physical uplink control channel detection unit 329 performs detection processing using a code sequence in the time domain, that is, processing for separating code-multiplexed signals in the time domain, for each SC-FDMA symbol of PUCCH. Is multiplied by each code of the code sequence, and then the signal multiplied by each code is synthesized. The physical uplink control channel detection unit 329 sets detection processing for the PUCCH signal based on the control signal from the control unit 105.

  The SRS processing unit 333 measures the channel quality using the SRS input from the subcarrier demapping unit 315, and outputs the UL PRB (UL PRB pair) channel quality measurement result to the control unit 105. The SRS processing unit 333 is instructed by the control unit 105 to determine which uplink subframe and which UL PRB (UL PRB pair) signal the channel quality of the mobile station apparatus 5 is to measure. Further, the SRS processing unit 333 detects an uplink synchronization shift using the SRS input from the subcarrier demapping unit 315, and sends information (synchronization shift information) indicating the uplink synchronization shift to the control unit 105. Output. Note that the SRS processing unit 333 may perform processing for detecting an uplink synchronization shift from a time domain received signal. The specific process may be the same as the process performed by the preamble detection unit 331 described later.

  Based on the signal input from the A / D unit 303, the preamble detection unit 331 performs a process of detecting (receiving) the preamble transmitted for the received signal corresponding to the PRACH. Specifically, the preamble detection unit 331 performs correlation processing on received signals at various timings within the guard time with replica signals generated using each preamble sequence that may be transmitted. . For example, if the correlation value is higher than a preset threshold value, the preamble detection unit 331 receives from the mobile station device 5 the same signal as the preamble sequence used to generate the replica signal used for the correlation processing. Judge that it was sent. The preamble detection unit 331 determines that the timing with the highest correlation value is the arrival timing of the preamble sequence. The preamble detection unit 331 generates preamble detection information including at least information indicating the detected preamble sequence and information indicating arrival timing, and outputs the preamble detection information to the control unit 105.

  The control unit 105 includes a subcarrier demapping unit based on control information (DCI) transmitted from the base station device 3 to the mobile station device 5 using PDCCH and control information (RRC signaling) transmitted using PDSCH. 315, a data demodulation unit 325, a turbo decoding unit 327, a propagation path estimation unit 317, and a physical uplink control channel detection unit 329 are controlled. Further, the control unit 105 determines which of the PRACH, PUSCH, PUCCH, and SRS that each mobile station device 5 has transmitted (may have transmitted) based on the control information that the base station device 3 has transmitted to the mobile station device 5. It is ascertained whether resources (uplink subframes, UL PRB (UL PRB pair), frequency domain code sequences, time domain code sequences) are configured.

  The information data decoded by the turbo decoding unit 327 includes a cyclic redundancy check (CRC) code. The mobile station apparatus 5 generates a CRC code from the information data transmitted on the uplink, and transmits the information data and the CRC code on the PUSCH. Here, the CRC code is used to determine whether the data included in the PUSCH is incorrect or not. For example, if the information generated from the data using a generator polynomial determined in advance in the base station device 3 is the same as the CRC code generated in the mobile station device 5 and transmitted on the PUSCH, the data is correct. If the information generated from the data using the generator polynomial determined in advance in the base station apparatus 3 is different from the CRC code generated in the mobile station apparatus 5 and transmitted on the PUSCH, the data is incorrect. It is judged. When it is determined that the data is not incorrect, the control unit 105 generates an ACK as information to be placed and transmitted in the PHICH. Generate.

<Overall configuration of mobile station apparatus 5>
Hereinafter, the configuration of the mobile station apparatus 5 according to the present embodiment will be described with reference to FIGS. 4, 5, and 6. FIG. 4 is a schematic block diagram showing the configuration of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the mobile station apparatus 5 includes a reception processing unit (first reception processing unit) 401, a radio resource control unit (first radio resource control unit) 403, and a control unit (first control unit). Reference numeral 405 denotes a transmission processing unit (first transmission processing unit) 407.

  The reception processing unit 401 receives a signal from the base station apparatus 3, and demodulates and decodes the received signal according to an instruction from the control unit 405. When the reception processing unit 401 detects a PDCCH signal (first PDCCH, second PDCCH) addressed to itself, the reception processing unit 401 outputs the DCI obtained by decoding the PDCCH signal to the control unit 405. For example, the reception processing unit 401 performs a process of detecting the second PDCCH addressed to itself in the Search Space in the second PDCCH region designated by the base station device 3. For example, the reception processing unit 401 performs a process of setting a Search space for an E-CCE aggregation number candidate and detecting a second PDCCH addressed to the own apparatus. For example, the reception processing unit 401 estimates a propagation path using the UE-specific RS in the second PDCCH region designated by the base station device 3, demodulates the signal of the second PDCCH, A process for detecting a signal including the control information addressed thereto is performed. For example, the reception processing unit 401, in accordance with the combination of each E-CCE and the corresponding antenna port in the DL PRB pair of the second PDCCH region notified from the base station device 3, the second PDCCH region The UE-specific RS used for demodulation of each E-CCE signal in the DL PRB pair recognizes the corresponding transmission antenna (antenna port), and performs processing to detect a signal including control information addressed to the own device.

  The reception processing unit 401 demodulates and decodes the second PHICH signal in the second PHICH region designated by the base station device 3. For example, the reception processing unit 401 estimates the propagation path using the UE-specific RS in the second PHICH area designated by the base station apparatus 3, demodulates the second PHICH signal, and transmits the signal. A process of detecting a signal including downlink control information (ACK / NACK) for data is performed. For example, the reception processing unit 401, in the DL PRB pair in the second PDCCH region, according to the antenna port corresponding to the resource element group in the DL PRB pair in the second PHICH region notified from the base station device 3 A process of detecting a signal including downlink control information (ACK / NACK) for transmitted data by recognizing a transmission antenna (antenna port) corresponding to UE-specific RS used for demodulation of a resource element group signal of Do. In the reception processing unit 401, the control unit 405 instructs which resource element group in the second PHICH region should perform demodulation and decoding of the second PHICH signal. The reception processing unit 401 outputs the detected ACK / NACK to the control unit 405.

  In addition, the reception processing unit 401 receives, via the control unit 405, information data obtained by decoding the PDSCH addressed to itself based on an instruction from the control unit 405 after outputting the DCI included in the PDCCH to the control unit 405. To the upper layer. In the DCI included in the PDCCH, the downlink assignment includes information indicating the allocation of PDSCH resources. Also, the reception processing unit 401 outputs the control information generated by the radio resource control unit 103 of the base station device 3 obtained by decoding the PDSCH to the control unit 405, and via the control unit 405, the reception processing unit 401 Output to the radio resource control unit 403. For example, the control information generated by the radio resource control unit 103 of the base station device 3 includes information indicating the DL PRB pair in the second PHICH region, information indicating the OFDM symbol in the second PHICH region, and the second PHICH region. Information indicating the antenna port corresponding to the resource element group in the DL PRB pair of the second, information indicating the DL PRB pair of the second PDCCH region, information indicating the physical resource mapping of the second PDCCH region (first physical resource mapping) , Or information indicating a second physical resource mapping), information indicating a combination of each E-CCE in the DL PRB pair and a corresponding antenna port (first combination, second combination, third combination, or 4th combination).

  Further, the reception processing unit 401 outputs a cyclic redundancy check (CRC) code included in the PDSCH to the control unit 405. Although omitted in the description of the base station apparatus 3, the transmission processing unit 107 of the base station apparatus 3 generates a CRC code from the information data, and transmits the information data and the CRC code by PDSCH. Here, the CRC code is used to determine whether the data included in the PDSCH is incorrect or not. For example, if the information generated from the data using a generator polynomial determined in advance in the mobile station device 5 is the same as the CRC code generated in the base station device 3 and transmitted on the PDSCH, the data is correct. If the information generated from the data using the generator polynomial determined in advance in the mobile station apparatus 5 is different from the CRC code generated in the base station apparatus 3 and transmitted on the PDSCH, the data is incorrect. It is judged.

  Further, the reception processing unit 401 measures downlink reception quality (RSRP: Reference Signal Received Power) and outputs the measurement result to the control unit 405. The reception processing unit 401 measures (calculates) RSRP from CRS or CSI-RS based on an instruction from the control unit 405. Details of the reception processing unit 401 will be described later.

  The control unit 405 confirms the data transmitted from the base station device 3 using the PDSCH and input from the reception processing unit 401, outputs the information data to the upper layer in the data, and the base station device in the data The reception processing unit 401 and the transmission processing unit 407 are controlled based on the control information generated by the third radio resource control unit 103. Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on an instruction from the radio resource control unit 403.

  For example, the control unit 405 controls the reception processing unit 401 to perform processing for detecting the second PDCCH on the signal in the DL PRB pair of the second PDCCH region instructed by the radio resource control unit 403. . For example, the control unit 405 receives the processing unit 401 so as to perform demapping of the physical resource of the second PDCCH region based on the information indicating the physical resource mapping of the second PDCCH region instructed from the radio resource control unit 403. To control. Here, the demapping of the physical resource in the second PDCCH region is, for example, as shown in FIGS. 19 and 20, configured as a second PDCCH candidate that performs detection processing from a signal in the second PDCCH region ( (Formation, construction, creation).

  In addition, the control unit 405 controls the reception processing unit 401 in an area in which the process for detecting the second PDCCH in the second PDCCH area is performed. Specifically, the control unit 405 executes, for each second PDCCH region, an E-CCE aggregation number for setting a search space, and a process for detecting the second PDCCH in the second PDCCH region. The first E-CCE number and the number of second PDCCH candidates are instructed (set) to the reception processing unit 401 for each E-CCE aggregation number.

  In addition, the control unit 405 includes a combination of each E-CCE in the DL PRB pair instructed from the radio resource control unit 403 and the corresponding antenna port (UE-specific RS corresponding to each E-CCE in the DL PRB pair). The reception processing unit 401 is controlled to use the UE-specific RS of the transmission antenna (antenna port) corresponding to the demodulation of each E-CCE signal.

  For example, the control unit 405 causes the reception processing unit 401 to perform a process of demodulating and decoding the second PHICH on the signal in the DL PRB pair in the second PHICH region specified by the radio resource control unit 403. Control. For example, the control unit 405 controls the reception processing unit 401 to perform a process of demodulating and decoding the second PHICH on the signal of the OFDM symbol in the second PHICH region specified by the radio resource control unit 403. . Further, the control unit 405, based on the antenna port corresponding to the resource element group in the DL PRB pair instructed from the radio resource control unit 403, the UE of the transmission antenna (antenna port) corresponding to the demodulation of the signal of the resource element group -Control the reception processing unit 401 to use the specific RS.

  Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on DCI transmitted from the base station apparatus 3 using the PDCCH and input from the reception processing unit 401. Specifically, the control unit 405 controls the reception processing unit 401 mainly based on the detected downlink assignment, and controls the transmission processing unit 407 mainly based on the detected uplink grant. Also, the control unit 405 controls the transmission processing unit 407 based on control information indicating a PUCCH transmission power control command included in the downlink assignment. The control unit 405 compares the information generated from the data input from the reception processing unit 401 using a predetermined generator polynomial with the CRC code input from the reception processing unit 401, and determines whether the data is incorrect. ACK / NACK is generated.

  The control unit 405 controls the transmission processing unit 407 based on ACK / NACK transmitted from the base station apparatus 3 using PHICH and input from the reception processing unit 401. The control unit 405 controls the transmission processing unit 407 to retransmit the PUSCH signal when NACK is detected in PHICH. When ACK is detected by PHICH, the control unit 405 controls the transmission processing unit 407 so as to hold the transmitted data without retransmitting the PUSCH signal. In addition, when the own mobile station apparatus 5 receives the uplink grant instructing transmission of new data from the base station apparatus 3, the control unit 405 deletes the stored transmitted data and creates new data. Is stored and stored. Note that the control unit 405 controls to delete the held transmitted data when the number of retransmissions of the stored transmitted data reaches a predetermined value.

  Further, the control unit 405 generates SR and CQI based on an instruction from the radio resource control unit 403. Further, the control unit 405 controls the transmission timing of the signal of the transmission processing unit 407 based on the adjustment value of the uplink transmission timing notified from the base station apparatus 3. Further, the control unit 405 controls the transmission processing unit 407 so as to transmit information indicating downlink reception quality (RSRP) input from the reception processing unit 401.

  Although omitted in the description of the base station apparatus 3, the base station apparatus 3 sets the E-CCE aggregation number candidate to the mobile station apparatus 5 based on the downlink reception quality (RSRP) notified from the mobile station apparatus 5. You may set it. For example, for the mobile station device 5 (mobile station device near the center of the cell) with good downlink reception quality, the base station device 3 uses E-CCE aggregation number as a candidate for the localized E-PDCCH. Aggregation 1, E-CCE aggregation 2, and E-CCE aggregation 4 may be set. For example, for the mobile station device 5 (mobile station device near the cell edge) whose downlink reception quality is not good, the base station device 3 uses E-CCE aggregation number as a candidate for the localized E-PDCCH. Aggregation 2 and E-CCE aggregation 4 may be set.

  The radio resource control unit 403 stores and holds the control information generated by the radio resource control unit 103 of the base station device 3 and notified from the base station device 3, and receives the reception processing unit 401 via the control unit 405. The transmission processing unit 407 is controlled. That is, the radio resource control unit 403 has a memory function for holding various parameters. For example, the radio resource control unit 403 corresponds to information on the DL PRB pair in the second PDCCH region, information on physical resource mapping in the second PDCCH region, and each E-CCE in the DL PRB pair in the second PDCCH region. Information on the combination with the antenna port (first combination, second combination, third combination, or fourth combination), information on the DL PRB pair in the second PHICH region, OFDM in the second PHICH region Information on symbols, information on antenna ports corresponding to resource element groups in the DL PRB pair of the second PHICH region are held, and various control signals are output to the control unit 405. For example, the radio resource control unit 403 recognizes (understands) the second PHICH in which the signal generated from the ACK / NACK information for the data transmitted by the mobile station apparatus 5 is arranged, and the second PHICH The control signal is output to the control unit 405 so that the reception processing unit 401 performs reception (demodulation) processing of the signal of the resource in which the signal is arranged. The radio resource control unit 403 holds parameters related to PUSCH, PUCCH, SRS, and PRACH transmission power, and outputs a control signal to the control unit 405 so as to use the parameters notified from the base station apparatus 3.

  Radio resource control section 403 sets values of parameters related to transmission power such as PUCCH, PUSCH, SRS, PRACH and the like. The transmission power value set in the radio resource control unit 403 is output to the transmission processing unit 407 by the control unit 405. In addition, DM RS comprised by the resource in UL PRB same as PUCCH performs the same transmission power control as PUCCH. Note that the DM RS configured with the same UL PRB resources as PUSCH is subjected to the same transmission power control as PUSCH. The radio resource control unit 403, for the PUSCH, parameters based on the number of UL PRB pairs assigned to the PUSCH, cell-specific and mobile-station device-specific parameters previously notified from the base station device 3, and modulation used for the PUSCH Values such as a parameter based on the method, a parameter based on the estimated path loss value, and a parameter based on the transmission power control command notified from the base station apparatus 3 are set. Radio resource control unit 403, for PUCCH, parameters based on the signal configuration of PUCCH, cell-specific and mobile station device-specific parameters previously notified from base station device 3, parameters based on estimated path loss values, A value such as a parameter based on the notified transmission power control command is set.

  As parameters related to transmission power, parameters specific to cells and mobile station apparatuses are notified from the base station apparatus 3 using the PDSCH, and transmission power control commands are notified from the base station apparatus 3 using the PDCCH. . The transmission power control command for PUSCH is included in the uplink grant, and the transmission power control command for PUCCH is included in the downlink assignment. Various parameters related to transmission power notified from the base station apparatus 3 are appropriately stored in the radio resource control unit 403, and the stored values are input to the control unit 405.

  The transmission processing unit 407 transmits a signal obtained by encoding and modulating information data and UCI to the base station apparatus 3 via the transmission antenna 411 using PUSCH and PUCCH resources in accordance with instructions from the control unit 405. Further, the transmission processing unit 407 sets the transmission power of PUSCH, PUCCH, SRS, DM RS, and PRACH according to the instruction of the control unit 405. Details of the transmission processing unit 407 will be described later.

<Reception Processing Unit 401 of Mobile Station Device 5>
Hereinafter, details of the reception processing unit 401 of the mobile station apparatus 5 will be described. FIG. 5 is a schematic block diagram showing the configuration of the reception processing unit 401 of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 401 includes a reception RF unit 501, an A / D unit 503, a symbol timing detection unit 505, a GI removal unit 507, an FFT unit 509, a demultiplexing unit 511, a propagation path estimation unit 513, PDSCH channel compensation unit 515, physical downlink shared channel decoding unit 517, PDCCH channel compensation unit 519, physical downlink control channel decoding unit 521, downlink reception quality measurement unit 531, PDCCH demapping unit 533, A PHICH propagation path compensation unit 535, a PHICH demapping unit 537, a sequence synthesis unit 539, and a BPSK demodulation unit 541 are configured. Further, as shown in this figure, the physical downlink shared channel decoding unit 517 includes a data demodulation unit 523 and a turbo decoding unit 525. Also, as shown in this figure, the physical downlink control channel decoding unit 521 includes a QPSK demodulation unit 527 and a Viterbi decoder unit 529.

  The reception RF unit 501 appropriately amplifies the signal received by the reception antenna 409, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and amplifies the signal so that the signal level is properly maintained. , And quadrature demodulation based on the in-phase and quadrature components of the received signal. The reception RF unit 501 outputs the quadrature demodulated analog signal to the A / D unit 503.

  A / D section 503 converts the analog signal quadrature demodulated by reception RF section 501 into a digital signal, and outputs the converted digital signal to symbol timing detection section 505 and GI removal section 507. Symbol timing detection section 505 detects symbol timing based on the digital signal converted by A / D section 503, and outputs a control signal indicating the detected symbol boundary timing to GI removal section 507. GI removal section 507 removes a portion corresponding to the guard interval from the digital signal output from A / D section 503 based on the control signal from symbol timing detection section 505, and converts the remaining portion of the signal to FFT section 509. Output to. The FFT unit 509 performs fast Fourier transform on the signal input from the GI removing unit 507, performs OFDM demodulation, and outputs the result to the demultiplexing unit 511.

  Based on the control signal input from the control unit 405, the demultiplexing unit 511 converts the signal demodulated by the FFT unit 509 into a PHICH (first PHICH, second PHICH) signal and a PDCCH (first PDCCH, The second PDCCH signal and the PDSCH signal are separated. The demultiplexing unit 511 outputs the separated PDSCH signal to the PDSCH propagation path compensation unit 515, outputs the separated PDCCH signal to the PDCCH propagation path compensation unit 519, and outputs the separated PHICH signal. The signal is output to the propagation compensation unit 535 for PHICH. For example, the demultiplexing unit 511 outputs the second PDCCH signal in the second PDCCH region designated by the own device to the PDCCH channel compensation unit 519. For example, the demultiplexing unit 511 outputs the second PHICH signal in the second PHICH region designated for the own device to the PHICH channel compensation unit 535.

  In addition, the demultiplexing unit 511 demultiplexes the downlink resource element in which the downlink reference signal is arranged, and outputs the downlink reference signal (CRS, UE-specific RS) to the propagation path estimation unit 513. For example, the demultiplexing unit 511 outputs the UE-specific RS of the second PDCCH region designated by the own device to the propagation path estimation unit 513. For example, the demultiplexing unit 511 outputs the UE-specific RS in the second PHICH region specified for the own device to the propagation path estimation unit 513. Further, the demultiplexing unit 511 outputs the downlink reference signal (CRS, CSI-RS) to the downlink reception quality measuring unit 531.

  The propagation path estimation unit 513 estimates the propagation path variation using the downlink reference signal and the known signal separated by the demultiplexing unit 511, and adjusts the amplitude and phase so as to compensate for the propagation path variation. The propagation path compensation value is output to the propagation path compensation section 515 for PDSCH, the propagation path compensation section 519 for PDCCH, and the propagation path compensation section 535 for PHICH. The propagation path estimation unit 513 estimates propagation path fluctuations independently using CRS and UE-specific RS, and outputs a propagation path compensation value. For example, the propagation path estimation unit 513 obtains the propagation path compensation value from the propagation path estimation value estimated using UE-specific RSs arranged in a plurality of DL PRB pairs in the second PDCCH region designated by the own apparatus. And output to the propagation path compensation unit 519 for PDCCH. For example, the propagation path estimation unit 513 obtains the propagation path compensation value from the propagation path estimation value estimated using UE-specific RSs arranged in a plurality of DL PRB pairs in the second PHICH region designated by the own apparatus. Generated and output to the propagation path compensation unit 535 for PHICH. In addition, the propagation path estimation part 513 performs propagation path estimation and the production | generation of a propagation path compensation value using UE-specific RS for every transmission antenna (antenna port) designated from the control part 405. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using UE-specific RSs allocated to a plurality of DL PRB pairs allocated to the own device and allocated to the PDSCH. , Output to PDSCH propagation path compensation unit 515. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using CRS, and outputs the propagation path compensation value to the PDCCH propagation path compensation unit 519. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using the CRS, and outputs the propagation path compensation value to the PHICH propagation path compensation unit 535. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using CRS, and outputs the propagation path compensation value to the PDSCH propagation path compensation unit 515.

  PDSCH propagation path compensation section 515 adjusts the amplitude and phase of the PDSCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. For example, the PDSCH channel compensation unit 515 adjusts a certain PDSCH signal according to the channel compensation value generated based on the UE-specific RS by the channel estimation unit 513, and performs different PDSCH signals. The propagation path estimation unit 513 adjusts according to the propagation path compensation value generated based on the CRS. PDSCH propagation path compensation section 515 outputs the signal whose propagation path has been adjusted to data demodulation section 523 of physical downlink shared channel decoding section 517.

  Based on an instruction from the control unit 405, the physical downlink shared channel decoding unit 517 demodulates and decodes the PDSCH and detects information data. Data demodulation section 523 demodulates the PDSCH signal input from propagation path compensation section 515, and outputs the demodulated PDSCH signal to turbo decoding section 525. This demodulation is demodulation corresponding to the modulation method used in the data modulation unit 221 of the base station device 3. The turbo decoding unit 525 decodes information data from the demodulated PDSCH signal input from the data demodulation unit 523 and outputs the decoded information data to the upper layer via the control unit 405. Note that the control information generated by the radio resource control unit 103 of the base station apparatus 3 transmitted using the PDSCH is also output to the control unit 405, and is also output to the radio resource control unit 403 via the control unit 405. The Note that the CRC code included in the PDSCH is also output to the control unit 405.

  PDCCH propagation path compensation section 519 adjusts the amplitude and phase of the PDCCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. For example, the channel compensation unit 519 for PDCCH adjusts the second PDCCH signal according to the channel compensation value generated based on the UE-specific RS by the channel estimation unit 513, and performs the first PDCCH signal transmission. The signal is adjusted according to the channel compensation value generated based on the CRS by the channel estimation unit 513 for the signal. For example, the PDCCH propagation path compensation unit 519 designates each E-CCE signal in the DL PRB pair of the second PDCCH region from the control unit 405, and transmits a corresponding transmission antenna (antenna port) to each E-CCE. ) According to the propagation path compensation value generated based on UE-specific RS. PDCCH propagation path compensation section 519 outputs the adjusted signal to PDCCH demapping section 533.

  The PDCCH demapping unit 533 performs first PDCCH demapping or second PDCCH demapping on the signal input from the PDCCH channel compensation unit 519. Further, the PDCCH demapping unit 533 demaps the first physical resource mapping or demaps the second physical resource mapping for the second PDCCH signal input from the PDCCH channel compensation unit 519. Perform mapping. The PDCCH demapping unit 533 receives the input second PDCCH signal so that the physical downlink control channel decoding unit 521 performs processing in units of E-CCEs illustrated in FIG. The second PDCCH signal is converted into an E-CCE unit signal. The PDCCH demapping unit 533 inputs the second PDCCH signal in the second PDCCH region to which the first physical resource mapping is applied, as described with reference to FIG. Convert to signal. As described with reference to FIG. 20, the PDCCH demapping unit 533 inputs the second PDCCH signal in the second PDCCH region to which the second physical resource mapping is applied, in the unit of E-CCE. Convert to signal. PDCCH demapping section 533 outputs the converted signal to QPSK demodulation section 527 of physical downlink control channel decoding section 521.

  The physical downlink control channel decoding unit 521 demodulates and decodes the signal input from the PDCCH channel compensation unit 519 as described below, and detects control data. The QPSK demodulator 527 performs QPSK demodulation on the PDCCH signal and outputs the result to the Viterbi decoder 529. The Viterbi decoder unit 529 decodes the signal demodulated by the QPSK demodulator 527 and outputs the decoded DCI to the controller 405. Here, this signal is expressed in bit units, and the Viterbi decoder unit 529 also performs rate dematching in order to adjust the number of bits for which Viterbi decoding processing is performed on the input bits.

  A detection process for the second PDCCH will be described. The mobile station apparatus 5 performs a process of detecting DCI addressed to itself, assuming a plurality of E-CCE aggregation numbers. The mobile station apparatus 5 performs a different decoding process on the signal of the second PDCCH for each assumed E-CCE aggregation number (coding rate), and converts the CRC code added to the second PDCCH together with the DCI. The DCI included in the second PDCCH in which no error is detected is acquired. Such a process is called blind decoding.

  Note that the mobile station apparatus 5 does not perform blind decoding assuming the second PDCCH for all E-CCE signals (received signals) in the second PDCCH area configured from the base station apparatus 3. Alternatively, blind decoding may be performed only for some E-CCEs. Some E-CCEs (E-CCEs) on which blind decoding is performed are referred to as “Search spaces” (Search space for the second PDCCH). In addition, a different search space (search space for the second PDCCH) is defined for each E-CCE aggregation number.

  In the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a search space is set (configured and defined) in each configured second PDCCH region. For example, the mobile station device 5 has a search space for each of the second PDCCH region to which the first physical resource mapping is applied and the second PDCCH region to which the second physical resource mapping is applied. Is set. In the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a plurality of Search spaces are set simultaneously in a certain downlink subframe.

  In the communication system 1 according to the embodiment of the present invention, different search spaces (search spaces for the second PDCCH) can be set in the mobile station apparatus 5 for the second PDCCH. Here, the search space for the second PDCCH (search space for the second PDCCH) of each mobile station apparatus 5 in which the second PDCCH region is configured is configured by completely different E-CCEs (E-CCEs). It may be configured by the same E-CCE (E-CCEs), or may be configured by overlapping E-CCEs (E-CCEs).

  In mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a search space (search space for the second PDCCH) is set in each second PDCCH region. The search space (search space for the second PDCCH) means a logical area in which the mobile station apparatus 5 performs decoding detection of the second PDCCH in the second PDCCH area. The Search space (Search space for the second PDCCH) is composed of a plurality of second PDCCH candidates. The second PDCCH candidate is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH. For each E-CCE aggregation number, different second PDCCH candidates are composed of different E-CCEs (including one E-CCE and a plurality of E-CCEs).

  The E-CCEs constituting the plurality of second PDCCH candidates of the search space (search space for the second PDCCH) of the second PDCCH region to which the first physical resource mapping is applied are consecutive E-CCE numbers. It comprises a plurality of E-CCEs. The first E-CCE number used for the search space (search space for the second PDCCH) in the second PDCCH region is set for each mobile station apparatus 5. The E-CCEs constituting the plurality of second PDCCH candidates of the search space (search space for the second PDCCH) of the second PDCCH region to which the second physical resource mapping is applied are non-E-CCE numbers. It is composed of a plurality of continuous E-CCEs.

  The first E-CCE number used for the search space (search space for the second PDCCH) in the second PDCCH region is set for each mobile station apparatus 5 and for each second PDCCH region. For example, the first E-CCE number used for the search space (search space for the second PDCCH) is set by a random function using an identifier (mobile station identifier) assigned to the mobile station device 5. For example, the base station apparatus 3 notifies the mobile station apparatus 5 of the first E-CCE number used for the search space (search space for the second PDCCH) using RRC signaling.

  In each search space (Search space for the second PDCCH) of each of the plurality of second PDCCH regions, the number of candidates for the second PDCCH may be different. The number of second PDCCH candidates in the search space (search space for the second PDCCH) of the second PDCCH region to which the first physical resource mapping is applied is the second number to which the second physical resource mapping is applied. The number may be larger than the number of second PDCCH candidates in the search space of the PDCCH region (search space for the second PDCCH).

  In addition, for a certain number of E-CCE sets, the number of second PDCCH candidates in the search space of the second PDCCH region to which the first physical resource mapping is applied (the search space for the second PDCCH), and the second The number of second PDCCH candidates in the search space (search space for the second PDCCH) of the second PDCCH region to which the physical resource mapping is applied is the same, and in the number of different E-CCE sets, The number of second PDCCH candidates in the search space (search space for the second PDCCH) of the second PDCCH region to which physical resource mapping is applied, and the second PDCCH region to which the second physical resource mapping is applied Search space (S for the second PDCCH The number of second PDCCH candidates of arch space) may be different.

  In addition, a second PDCCH candidate for a certain number of E-CCE aggregations is set as a search space (search space for the second PDCCH) of one second PDCCH region, and a different one of the second PDCCH regions It may not be set to Search space (Search space for the second PDCCH).

  Further, according to the number of second PDCCH regions configured in the mobile station apparatus 5, the number of second PDCCH candidates in the search space (search space for the second PDCCH) in one second PDCCH region is determined. It may be varied. For example, as the number of second PDCCH regions configured in the mobile station device 5 increases, the number of second PDCCH candidates in the search space (search space for the second PDCCH) in one second PDCCH region is increased. Reduce.

  The mobile station apparatus 5 sets the Search space corresponding to the E-CCE aggregation number candidate in the second PDCCH region to which the first physical resource mapping is applied. In addition, the mobile station apparatus 5 is a combination of each E-CCE in the DL PRB pair and the corresponding antenna port notified from the base station apparatus 3 (each E-CCE in the DL PRB pair in the second PDCCH region). And the antenna port (transmission antenna) corresponding to each E-CCE), the transmission antennas (antennas) used for transmitting the signals of each E-CCE in the DL PRB pair of the second PDCCH region Port).

  The detection process for the first PDCCH is conceptually similar to the detection process for the second PDCCH. The unit constituting the first PDCCH signal is different from the E-CCE which is the unit constituting the second PDCCH signal. The resource of the unit which comprises the 1st PDCCH signal is comprised by the method different from E-CCE.

  The PHICH channel compensation unit 535 adjusts the amplitude and phase of the PHICH signal separated by the demultiplexing unit 511 according to the channel compensation value input from the channel estimation unit 513. For example, the PHICH propagation path compensation unit 535 adjusts the second PHICH signal according to the propagation path compensation value generated based on the UE-specific RS by the propagation path estimation unit 513, and the first PHICH signal The signal is adjusted according to the channel compensation value generated based on the CRS by the channel estimation unit 513 for the signal. For example, the propagation path compensation unit 535 for PHICH uses the resource element group signal in the DL PRB pair in the second PHICH region based on the UE-specific RS of the transmission antenna (antenna port) designated by the control unit 405. Is adjusted according to the propagation path compensation value generated in the above. The PHICH propagation path compensation unit 535 outputs the adjusted signal to the PHICH demapping unit 537.

  The PHICH demapping unit 537 performs first PHICH demapping or second PHICH demapping on the signal input from the PHICH propagation path compensation unit 535. The PHICH demapping unit 537 performs processing for extracting signals of a plurality of resource element groups corresponding to the PHICH instructed by the control unit 405. For example, the PHICH demapping unit 537 extracts signals of a plurality of resource element groups arranged as shown in FIG. 22 corresponding to the second PHICH instructed by the control unit 405. For example, the PHICH demapping unit 537 extracts signals of a plurality of resource element groups arranged as shown in FIG. 23 corresponding to the second PHICH instructed by the control unit 405. For example, the PHICH demapping unit 537 extracts signals of a plurality of resource element groups arranged as shown in FIG. 24 corresponding to the second PHICH instructed by the control unit 405. The PHICH demapping unit 537 outputs the extracted signals of the plurality of resource element groups to the sequence synthesis unit 539.

  The sequence synthesis unit 539 multiplies the signal of each resource element group input from the PHICH demapping unit 537 by the orthogonal sequence specified by the control unit 405. In a process for a certain PHICH, sequence synthesizing section 539 multiplies the signal of each resource element group by a common orthogonal sequence. Sequence synthesizing section 539 performs processing for synthesizing the signal of the resource element group multiplied by the orthogonal sequence. Furthermore, the sequence synthesis unit 539 performs a process of further synthesizing signals between the synthesized resource element groups. An example of the processing of the sequence synthesis unit 539 will be described with reference to FIG. For example, a case where a certain second PHICH includes a resource element group 1, a resource element group 6, and a resource element group 11 will be described. For example, a case where [+1 +1 +1 +1] is used as an orthogonal sequence will be described. Sequence combining section 539 multiplies the signal of resource element group 1 by orthogonal sequence [+1 +1 +1 +1], multiplies the signal of resource element group 6 by orthogonal sequence [+1 +1 +1 +1], and The group 11 signal is multiplied by the orthogonal sequence [+1 +1 +1 +1]. Sequence combining section 539 combines the signal of each resource element of the signal of resource element group 1 multiplied by the orthogonal sequence. Sequence combining section 539 combines the signal of each resource element of the signal of resource element group 6 multiplied by the orthogonal sequence. Sequence combining section 539 combines the signal of each resource element of the signal of resource element group 11 multiplied by the orthogonal sequence. Next, sequence synthesis section 539 synthesizes the signal of resource element group 1 that has been synthesized, the signal of resource element group 6 that has been synthesized, and the signal of resource element group 11 that has been synthesized. The sequence synthesis unit 539 outputs the synthesized signal to the BPSK demodulation unit 541.

  The BPSK demodulation unit 541 performs BPSK demodulation on the signal input from the sequence synthesis unit 539, detects ACK / NACK, and outputs the detected ACK / NACK to the control unit 405. In the embodiment of the present invention, only an example of the PHICH signal detection process is shown, and other methods may be used for the PHICH signal detection process.

  The control unit 405 determines whether the DCI input from the Viterbi decoder unit 529 is the DCI addressed to itself with no error, and determines that the DCI is addressed to the own device without error. 511, a data demodulator 523, a turbo decoder 525, and a transmission processor 407 are controlled. For example, when the DCI is a downlink assignment, the control unit 405 controls the reception processing unit 401 to decode the PDSCH signal. Note that the CRC code is also included in the PDCCH as in the PDSCH, and the control unit 405 determines whether or not the DCI of the PDCCH is incorrect using the CRC code.

  Note that the control unit 405 controls the transmission processing unit 407 based on ACK / NACK. When ACK / NACK is NACK, control unit 405 controls transmission processing unit 407 to retransmit the PUSCH signal. When the ACK / NACK is ACK, the control unit 405 controls the transmission processing unit 407 so as to hold the transmitted data without retransmitting the PUSCH signal.

  The downlink reception quality measurement unit 531 measures the downlink reception quality (RSRP) of the cell using the downlink reference signal (CRS, CSI-RS), and sends the measured downlink reception quality information to the control unit 405. Output. The downlink reception quality measurement unit 531 also performs instantaneous channel quality measurement for generating CQI to be notified to the base station apparatus 3 in the mobile station apparatus 5. The downlink reception quality measurement unit 531 outputs information such as the measured RSRP to the control unit 405.

<Transmission Processing Unit 407 of Mobile Station Device 5>
FIG. 6 is a schematic block diagram showing the configuration of the transmission processing unit 407 of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 407 includes a turbo coding unit 611, a data modulation unit 613, a DFT unit 615, an uplink pilot channel processing unit 617, a physical uplink control channel processing unit 619, a subcarrier mapping unit 621, An IFFT unit 623, a GI insertion unit 625, a transmission power adjustment unit 627, a random access channel processing unit 629, a D / A unit 605, a transmission RF unit 607, and a transmission antenna 411 are configured. The transmission processing unit 407 performs coding and modulation on information data and UCI, generates a signal to be transmitted using PUSCH and PUCCH, and adjusts transmission power of PUSCH and PUCCH. The transmission processing unit 407 generates a signal to be transmitted using the PRACH and adjusts the transmission power of the PRACH. The transmission processing unit 407 generates DM RSs and SRSs, and adjusts the transmission powers of the DM RSs and SRSs.

  The turbo coding unit 611 performs turbo coding for increasing the error tolerance of the data at the coding rate instructed by the control unit 405 and outputs the input information data to the data modulation unit 613. The data modulation unit 613 modulates the code data encoded by the turbo coding unit 611 using a modulation method instructed by the control unit 405, for example, a modulation method such as QPSK, 16QAM, or 64QAM, and converts the signal sequence of modulation symbols. Generate. Data modulation section 613 outputs the generated modulation symbol signal sequence to DFT section 615. The DFT unit 615 performs discrete Fourier transform on the signal output from the data modulation unit 613 and outputs the result to the subcarrier mapping unit 621.

  The physical uplink control channel processing unit 619 performs baseband signal processing for transmitting UCI input from the control unit 405. The UCI input to the physical uplink control channel processing unit 619 is ACK / NACK, SR, and CQI. The physical uplink control channel processing unit 619 performs baseband signal processing and outputs the generated signal to the subcarrier mapping unit 621. The physical uplink control channel processing unit 619 encodes UCI information bits to generate a signal.

  Also, the physical uplink control channel processing unit 619 performs signal processing related to frequency domain code multiplexing and / or time domain code multiplexing on a signal generated from UCI. The physical uplink control channel processing unit 619 is a control unit for realizing frequency domain code multiplexing for PUCCH signals generated from ACK / NACK information bits, SR information bits, or CQI information bits. Multiply the code sequence indicated by 405. The physical uplink control channel processing unit 619 uses a code instructed by the control unit 405 to implement time-domain code multiplexing for PUCCH signals generated from ACK / NACK information bits or SR information bits. Multiply series.

  Uplink pilot channel processing section 617 generates SRS and DM RS, which are known signals in base station apparatus 3, based on instructions from control section 405, and outputs them to subcarrier mapping section 621.

  The subcarrier mapping unit 621 converts the signal input from the uplink pilot channel processing unit 617, the signal input from the DFT unit 615, and the signal input from the physical uplink control channel processing unit 619 into the control unit 405. Are arranged on subcarriers according to instructions from, and output to IFFT section 623.

  IFFT section 623 performs fast inverse Fourier transform on the signal output from subcarrier mapping section 621 and outputs the result to GI insertion section 625. Here, the number of points of IFFT section 623 is larger than the number of points of DFT section 615, and mobile station apparatus 5 transmits using PUSCH by using DFT section 615, subcarrier mapping section 621, and IFFT section 623. DFT-Spread-OFDM modulation is performed on the signal. GI insertion section 625 adds a guard interval to the signal input from IFFT section 623 and outputs the signal to transmission power adjustment section 627.

  The random access channel processing unit 629 generates a signal to be transmitted on the PRACH using the preamble sequence instructed by the control unit 405, and outputs the generated signal to the transmission power adjustment unit 627.

  The transmission power adjustment unit 627 adjusts the transmission power based on the control signal from the control unit 405 with respect to the signal input from the GI insertion unit 625 or the signal input from the random access channel processing unit 629, and performs D / Output to A section 605. Note that the transmission power adjustment unit 627 controls the average transmission power of PUSCH, PUCCH, DM RS, SRS, and PRACH for each uplink subframe.

  The D / A unit 605 converts the baseband digital signal input from the transmission power adjustment unit 627 into an analog signal and outputs the analog signal to the transmission RF unit 607. The transmission RF unit 607 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 605, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF unit 607 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits to the base station apparatus 3 via the transmission antenna 411. Send.

  FIG. 7 is a flowchart showing an example of a second PHICH signal reception process of the mobile station apparatus 5 according to the embodiment of the present invention. The mobile station apparatus 5 receives information indicating the DL PRB pair of the second PHICH region and information indicating the OFDM symbol from the base station apparatus 3 using RRC signaling (step S101). Next, the mobile station device 5 recognizes the second PHICH region based on the information received from the base station device 3, and recognizes the configuration of the second PHICH in the second PHICH region (step S102). . Specifically, the mobile station apparatus 5 includes the number of resource element groups configured in the second PHICH region, the number of each resource element group, the number of second PHICHs, the number of second PHICHs, Recognize the configuration of the resource element group that constitutes the second PHICH (which number of resource element groups is configured). Next, the mobile station apparatus 5 recognizes the second PHICH in which a signal generated from the ACK / NACK information for the transmitted data is arranged for a plurality of second PHICHs in the second PHICH region. (Step S103). Next, the mobile station apparatus 5 demodulates a second PHICH signal in which a signal generated from ACK / NACK information for the transmitted data is arranged (step S104). Specifically, the mobile station apparatus 5 extracts signals arranged in a plurality of resource element groups corresponding to the second PHICH, multiplies the signals arranged in the resource element groups by orthogonal sequences, and combines them. Processing, processing for BPSK demodulation of the synthesized signal, etc. are performed.

  FIG. 8 is a flowchart showing an example of a second PHICH signal transmission process of the base station apparatus 3 according to the embodiment of the present invention. The base station apparatus 3 sets DL PRB pair and OFDM symbols that constitute the second PHICH region for the mobile station apparatus 5 (step T101). Next, the base station device 3 recognizes the configuration of the second PHICH in the second PHICH region based on the set parameters of the second PHICH region (step T102). Specifically, the base station device 3 includes the number of resource element groups configured in the second PHICH region, the number of each resource element group, the number of second PHICHs, the number of second PHICHs, Recognize the configuration of the resource element group that constitutes the second PHICH (which number of resource element groups is configured). Next, the base station apparatus 3 recognizes the second PHICH in which a signal generated from ACK / NACK information for the received data is arranged for each mobile station apparatus 5 (step T103). Next, the base station apparatus 3 transmits a second PHICH signal in which a signal generated from ACK / NACK information for the received data is arranged (step T104). Specifically, the base station device 3 performs processing for encoding ACK / NACK information bits, processing for BPSK modulation, processing for multiplying orthogonal sequences, precoding processing, and a plurality of resource element groups corresponding to the second PHICH. The second PHICH signal is transmitted by performing a process of arranging the signal in the second PHICH.

  As described above, in the embodiment of the present invention, in the communication system 1, the base station apparatus 3 has an area (second PHICH) in which a channel (second PHICH) used for ACK / NACK transmission / reception may be arranged. Multiple physical resource block pairs (DL PRB pairs) are set for the mobile station apparatus 5 as the PHICH area of the mobile station apparatus 5, and the mobile station apparatus 5 sets the multiple physical resource block pairs (DL PRB pairs) set by the base station apparatus 3. pair), transmission / reception of ACK / NACK in which a signal generated from ACK / NACK information for data (uplink data) transmitted by own mobile station apparatus 5 (data transmitted using PUSCH) is arranged. Recognizes the channel (second PHICH) to be used, and the channel (second PICH) used to transmit / receive the ACK / NACK. ICH) is controlled so as to demodulate the signal of the resource in which the signal is arranged, and a plurality of resource element groups are included in each physical resource block pair (DL PRB pair) in the region (second PHICH region). The resource element group is composed of a plurality of resource elements, and the signal of the channel (second PHICH) used for transmission / reception of the ACK / NACK is a physical resource block pair (DL PRB pair) in which each resource element group is different. ) Are arranged in a plurality of resource element groups. As a result, interference coordination in the frequency domain is supported, frequency diversity is realized, and a channel capable of demodulating a signal using a unique reference signal (UE-specific RS) in the mobile station apparatus 5 is ACK / NACK. Can be used for a channel for transmitting the data, and efficient communication becomes possible. Specifically, the base station apparatus 3 can set the second PHICH region in a region where the inter-cell interference is low, and can reduce interference received by the second PHICH signal. Specifically, the base station device 3 can configure the second PHICH region using PRB pairs separated in the frequency region, and can realize frequency diversity for the second PHICH signal. . Specifically, the mobile station apparatus 5 can demodulate the signal of the channel used for transmission / reception of ACK / NACK using UE-specific RS. Further, the base station apparatus 3 can control the number of second PHICHs used in the communication system 1 by controlling the number of physical resource block pairs constituting the second PHICH region.

  Further, in the embodiment of the present invention, in the communication system 1, a predetermined OFDM is generated in an area (second PHICH area) where a channel (second PHICH) used for transmission / reception of ACK / NACK may be arranged. A resource element group is configured in the symbol, and the base station apparatus 3 controls the number of predetermined OFDM symbols. Thereby, the base station apparatus 3 can control the number of second PHICHs used in the communication system 1.

  In the embodiment of the present invention, in the communication system 1, a region (second PHICH region) in which a channel (second PHICH) used for transmission / reception of ACK / NACK may be arranged is a control channel ( It is configured in a plurality of physical resource block pairs (DL PRB pairs) in which an area (second PDCCH area) in which the second PDCCH) may be arranged is configured. In the embodiment of the present invention, in the communication system 1, a region (second PHICH region) in which a channel (second PHICH) used for transmission / reception of ACK / NACK may be arranged is the second The physical resource mapping is applied and configured in a plurality of physical resource block pairs (DL PRB pairs) in which a region (second PDCCH region) in which a control channel (second PDCCH) may be arranged is configured. The Thereby, the second PHICH can be used while preventing an increase in overhead regarding the second PHICH and UE-specific RS.

  In the embodiment of the present invention, for simplification of description, the resource area where the second PHICH may be arranged is defined as the second PHICH area. It is clear that the present invention can be applied if it has a similar meaning.

  Further, the mobile station device 5 is not limited to a moving terminal, and the present invention may be realized by mounting the function of the mobile station device 5 on a fixed terminal.

  The characteristic means of the present invention described above can also be realized by mounting and controlling functions in an integrated circuit. That is, the integrated circuit of the present invention is an integrated circuit mounted on a mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK, and is a channel used for transmission / reception of ACK / NACK. A signal generated from ACK / NACK information for data transmitted by the mobile station apparatus is arranged in a plurality of physical resource block pairs set by the base station apparatus as an area where the mobile station apparatus may be arranged. A first radio resource control unit that recognizes a channel used for transmission / reception of ACK / NACK, and a resource in which a signal of the channel used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit is arranged A first control unit that performs control so as to demodulate the signal of each of the physical resource blocks in the region. A plurality of resource element groups are configured in a pair of resources, the resource element group is configured of a plurality of resource elements, and a channel signal used for transmission / reception of the ACK / NACK is configured in different physical resource block pairs And being arranged in a plurality of the resource element groups.

  The integrated circuit of the present invention is an integrated circuit mounted on a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses, and transmits / receives ACK / NACK. A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station apparatus as an area where a channel to be used may be arranged, and each of the physical resources in the area A plurality of resource element groups are configured in a resource block pair, the resource element group is configured of a plurality of resource elements, and a channel signal used for transmission / reception of ACK / NACK is configured in different physical resource block pairs. Arranged in a plurality of the resource element groups.

  The operations described in the embodiments of the present invention may be realized by a program. The program that operates in the mobile station device 5 and the base station device 3 related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention. Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

  In addition, when distributing to the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention. Moreover, you may implement | achieve part or all of the mobile station apparatus 5 and the base station apparatus 3 in embodiment mentioned above as LSI which is typically an integrated circuit. Each functional block of the mobile station device 5 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used. Each functional block of the mobile station device 5 and the base station device 3 may be realized by a plurality of circuits.

  Information and signals may be presented using a variety of different techniques and methods. For example, chips, symbols, bits, signals, information, commands, instructions, and data that may be referred to throughout the above description may be indicated by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or light particles, or combinations thereof .

  Various exemplary logic blocks, processing units, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this synonym between hardware and software, various illustrative elements, blocks, modules, circuits, and steps have been described generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in a variety of ways for each specific application, but such implementation decisions should not be construed as departing from the scope of this disclosure.

  Various exemplary logic blocks, processing units described in connection with the disclosure herein are general purpose processors, digital signal processors (DSPs) designed to perform the functions described herein. , Application specific integrated circuit (ASIC), field programmable gate array signal (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or combinations thereof . A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices. For example, a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors connected to a DSP core, or a combination of other such configurations.

  The method or algorithm steps described in connection with the disclosure herein may be directly embodied by hardware, software modules executed by a processor, or a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any form of recording medium known in the art. A typical recording medium may be coupled to the processor such that the processor can read information from, and write information to, the recording medium. In the alternative, the recording medium may be integral to the processor. The processor and the recording medium may be in the ASIC. The ASIC can be in the mobile station device (user terminal). Or a processor and a recording medium may exist in the mobile station apparatus 5 as a discrete element.

  In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or a combination thereof. If implemented by software, the functions may be maintained or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both communication media and computer recording media including media that facilitate carrying a computer program from one place to another. The recording medium may be any commercially available medium that can be accessed by a general purpose or special purpose computer. By way of example and not limitation, such computer readable media may be RAM, ROM, EEPROM, CDROM or other optical disc media, magnetic disc media or other magnetic recording media, or general purpose or It can include media that can be accessed by a special purpose computer or general purpose or special purpose processor and used to carry or retain the desired program code means in the form of instructions or data structures. Any connection is also properly termed a computer-readable medium. For example, if the software uses a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, wireless, or microwave, a website, server, or other remote source When transmitting from, these coaxial cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the definition of the medium. The discs (disk, disc) used in the present specification include compact discs (CD), laser discs (registered trademark), optical discs, digital versatile discs (DVD), floppy (registered trademark) discs, and Blu-ray discs. The disk generally reproduces data magnetically, while the disk optically reproduces data with a laser. Combinations of the above should also be included on the computer-readable medium.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope not departing from the gist of the present invention are also claimed. Included in the range.

3 Base station apparatus 4 (A to C) RRH
5 (A to C) mobile station apparatus 101 reception processing unit 103 radio resource control unit 105 control unit 107 transmission processing unit 109 reception antenna 111 transmission antenna 201 physical downlink shared channel processing unit 203 physical downlink control channel processing unit 205 downlink Pilot channel processing section 207 Multiplexing section 209 IFFT section 211 GI insertion section 213 D / A section 215 Transmission RF section 219 Turbo coding section 221 Data modulation section 223 Convolution coding section 225 QPSK modulation section 227 Precoding processing section (for PDCCH)
229 Precoding processing unit (for PDSCH)
231 Precoding processing unit (for downlink pilot channel)
233 Physical Hybrid ARQ indicator channel processing unit 235 ACK / NACK coding unit 237 BPSK modulation unit 239 Orthogonal sequence multiplication unit 241 Precoding processing unit 301 Reception RF unit 303 A / D unit 309 Symbol timing detection unit 311 GI removal unit 313 FFT unit 315 Subcarrier demapping unit 317 Channel estimation unit 319 Channel equalization unit (for PUSCH)
321 Channel equalization unit (for PUCCH)
323 IDFT unit 325 Data demodulation unit 327 Turbo decoding unit 329 Physical uplink control channel detection unit 331 Preamble detection unit 333 SRS processing unit 401 reception processing unit 403 radio resource control unit 405 control unit 407 transmission processing unit 409 reception antenna 411 transmission antenna 501 Reception RF unit 503 A / D unit 505 Symbol timing detection unit 507 GI removal unit 509 FFT unit 511 Demultiplexing unit 513 Channel estimation unit 515 Channel compensation unit (for PDSCH)
517 Physical downlink shared channel decoding unit 519 Propagation channel compensation unit (for PDCCH)
521 Physical downlink control channel decoding unit 523 Data demodulation unit 525 Turbo decoding unit 527 QPSK demodulation unit 529 Viterbi decoder unit 531 Downlink reception quality measurement unit 533 PDCCH demapping unit 535 Propagation channel compensation unit (for PHICH)
537 PHICH demapping unit 539 Sequence synthesis unit 541 BPSK demodulation unit 605 D / A unit 607 Transmission RF unit 611 Turbo coding unit 613 Data modulation unit 615 DFT unit 617 Uplink pilot channel processing unit 619 Physical uplink control channel processing unit 621 sub Carrier mapping unit 623 IFFT unit 625 GI insertion unit 627 Transmission power adjustment unit 629 Random access channel processing unit

Claims (14)

A communication system comprising a plurality of mobile station apparatuses and a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with the plurality of mobile station apparatuses,
The base station device
A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station device as a region where a channel used for transmission / reception of ACK / NACK may be arranged,
The mobile station device
Channel used for transmission / reception of ACK / NACK in which a signal generated from ACK / NACK information for data transmitted by the mobile station device is arranged in the plurality of physical resource block pairs set by the base station device A first radio resource control unit for recognizing
A first control unit that controls to demodulate a signal of a resource in which a signal of a channel used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit is provided,
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
A communication system, wherein a channel signal used for transmission / reception of the ACK / NACK is arranged in a plurality of the resource element groups configured in different physical resource block pairs. The resource element group is configured in a predetermined OFDM symbol within the region,
The communication system according to claim 1, wherein the second radio resource control unit sets the number of the OFDM symbols.   A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a region where a channel used for transmission / reception of the ACK / NACK may be arranged is the control channel The communication system according to claim 1, wherein the communication system is configured in the plurality of physical resource block pairs in which an area is configured. A first element is composed of resources obtained by dividing one physical resource block pair in the control channel region,
4. The communication system according to claim 3, wherein the control channel is configured by a set of a plurality of the first elements, each of the first elements being configured in the different physical resource block pairs. A mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK,
ACK / NACK information for data transmitted by the mobile station device within a plurality of physical resource block pairs set by the base station device as a region where a channel used for ACK / NACK transmission / reception may be arranged A first radio resource control unit for recognizing a channel used for transmission / reception of ACK / NACK in which a signal generated from
A first control unit that controls to demodulate a signal of a resource in which a signal of a channel used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit is provided,
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
A mobile station apparatus, wherein a channel signal used for transmission / reception of the ACK / NACK is arranged in a plurality of the resource element groups configured in different physical resource block pairs. The resource element group is configured in a predetermined OFDM symbol within the region,
The mobile station apparatus according to claim 5, wherein the number of the OFDM symbols is set by the base station apparatus. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged,
The area where a channel used for transmission / reception of the ACK / NACK may be arranged is configured in the plurality of physical resource block pairs in which the control channel area is configured. Mobile station equipment. A first element is composed of resources obtained by dividing one physical resource block pair in the control channel region,
The mobile station apparatus according to claim 7, wherein the control channel is configured by a set of a plurality of the first elements, each of the first elements being configured in the different physical resource block pairs. . A base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses,
A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station device as a region where a channel used for transmission / reception of ACK / NACK may be arranged,
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
A base station apparatus, wherein a channel signal used for ACK / NACK transmission / reception is arranged in a plurality of resource element groups configured in different physical resource block pairs. The resource element group is configured in a predetermined OFDM symbol within the region,
The base station apparatus according to claim 9, wherein the second radio resource control unit sets the number of the OFDM symbols. A communication method used for a mobile station device that performs communication using a channel used for transmission / reception of ACK / NACK with a base station device,
ACK / NACK information for data transmitted by the mobile station device within a plurality of physical resource block pairs set by the base station device as a region where a channel used for ACK / NACK transmission / reception may be arranged Recognizing a channel used for transmission / reception of ACK / NACK in which a signal generated from is arranged;
Controlling to demodulate a signal of a resource in which a signal of a channel used for transmission / reception of the recognized ACK / NACK is arranged, and
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
A communication method, wherein a channel signal used for transmission / reception of the ACK / NACK is arranged in a plurality of resource element groups configured in different physical resource block pairs. A communication method used for a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses,
Setting a plurality of physical resource block pairs for the mobile station apparatus as an area where a channel used for transmission / reception of ACK / NACK may be arranged, and
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
A communication method, wherein a channel signal used for ACK / NACK transmission / reception is arranged in a plurality of resource element groups configured in different physical resource block pairs. An integrated circuit mounted on a mobile station apparatus that communicates with a base station apparatus using a channel used for transmission / reception of ACK / NACK,
ACK / NACK information for data transmitted by the mobile station device within a plurality of physical resource block pairs set by the base station device as a region where a channel used for ACK / NACK transmission / reception may be arranged A first radio resource control unit for recognizing a channel used for transmission / reception of ACK / NACK in which a signal generated from
A first control unit that controls to demodulate a signal of a resource in which a signal of a channel used for transmission / reception of the ACK / NACK recognized by the first radio resource control unit is provided,
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
An integrated circuit, wherein a channel signal used for transmission / reception of the ACK / NACK is arranged in a plurality of the resource element groups configured in different physical resource block pairs. An integrated circuit mounted on a base station apparatus that performs communication using a plurality of channels used for transmission / reception of ACK / NACK with a plurality of mobile station apparatuses,
A second radio resource control unit configured to set a plurality of physical resource block pairs for the mobile station device as a region where a channel used for transmission / reception of ACK / NACK may be arranged,
A plurality of resource element groups are configured in each of the physical resource block pairs in the region,
The resource element group is composed of a plurality of resource elements,
An integrated circuit, wherein a channel signal used for transmission / reception of ACK / NACK is arranged in a plurality of resource element groups configured in different physical resource block pairs.