WO2016182050A1 - ユーザ端末、無線基地局、無線通信システム及び無線通信方法 - Google Patents
ユーザ端末、無線基地局、無線通信システム及び無線通信方法 Download PDFInfo
- Publication number
- WO2016182050A1 WO2016182050A1 PCT/JP2016/064244 JP2016064244W WO2016182050A1 WO 2016182050 A1 WO2016182050 A1 WO 2016182050A1 JP 2016064244 W JP2016064244 W JP 2016064244W WO 2016182050 A1 WO2016182050 A1 WO 2016182050A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- user terminal
- signal
- band
- narrowband
- prb
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
Definitions
- the present invention relates to a user terminal, a radio base station, a radio communication system, and a radio communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- FRA Full Radio Access
- inter-device communication M2M: Machine-to-Machine
- MTC Machine Type Communication
- 3GPP Third Generation Partnership Project
- MTC terminals MTC UE (User Equipment)
- MTC UE User Equipment
- 3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2”
- 3GPP TS 36.888 “Study on provision of low-cost Machine-Type Communications (MTC) User Equipments (UEs) based on LTE (Release 12)”
- MTC Machine-Type Communications
- UEs User Equipments
- the low-cost MTC terminal is realized by limiting the use band of the uplink (UL) and the downlink (DL) to a part of the system band.
- the system band corresponds to, for example, an existing LTE band (20 MHz or the like), a component carrier (CC), or the like.
- NB Narrow Band
- PRBs Physical Resource Blocks
- data is allocated to a normal terminal (Normal UE) in a predetermined resource block group (RBG) unit composed of a plurality of PRBs.
- RBG resource block group
- MTC terminals can use only a part of the narrow band (NB), which may reduce the throughput.
- the present invention has been made in view of the above points, and a user terminal and a radio base station capable of suppressing a decrease in throughput in communication of a user terminal in which a use band is limited to a narrow part of the system band
- Another object is to provide a wireless communication system and a wireless communication method.
- a user terminal is a user terminal in which a use band is limited to a part of a narrow band of a system band, and a control unit that selects a predetermined narrow band set including a plurality of narrow bands And a receiving unit that receives a downlink signal in a narrow band included in the predetermined narrow band set, and the control unit includes a plurality of frequency shifts to which the predetermined narrow band set is applied to different frequency shifts. It is characterized by selecting from a narrow band set.
- the present invention it is possible to suppress a decrease in throughput in communication of a user terminal in which a use band is limited to a narrow band that is a part of the system band.
- a low-cost MTC terminal it is considered to allow a reduction in processing capability and simplify the hardware configuration.
- the peak rate is reduced, the transport block size is limited, and resource blocks (RB (Resource Block), PRB (Physical Resource Block)) are compared to existing user terminals (LTE terminals). It is considered to apply the restriction on the reception and the restriction on the reception RF.
- RB Resource Block
- PRB Physical Resource Block
- the low cost MTC terminal may be simply referred to as an MTC terminal.
- the existing user terminal may be referred to as a normal user terminal, a normal UE (Normal UE), or a Non-MTC UE.
- UE user terminal
- the upper limit of the use band of the MTC terminal is limited to a predetermined narrow band (for example, 1.4 MHz). Is done.
- the MTC terminal whose bandwidth is limited is considered to operate within the LTE / LTE-A system band.
- the MTC terminal may be represented as a terminal whose maximum band to be supported is a narrow band that is a part of the system band, or a terminal that has a transmission / reception performance in a narrower band than the LTE / LTE-A system band May be represented.
- FIG. 1 is a diagram showing an example of the arrangement of NBs (narrow bands) in the system band.
- NB narrow band that has a bandwidth of 1.4 MHz and that can be accessed by the MTC terminal
- the name is not limited to this as long as it has these characteristics.
- it may be called a PRB set.
- PRB set attention is paid to a part of PRBs when the whole is composed of 100 PRBs (the same applies to FIGS. 3 and 4).
- a predetermined narrow band for example, 1.4 MHz
- the LTE system band for example, 20 MHz
- the narrow band corresponds to a frequency band that can be detected by the MTC terminal.
- the narrow band frequency position which is the use band of the MTC terminal
- the MTC terminal preferably performs communication using different frequency resources for each predetermined period (for example, subframe).
- the MTC terminal preferably has an RF retuning function in consideration of application of frequency hopping and frequency scheduling.
- FIG. 1 shows an example in which 1NB is composed of 6PRBs.
- the radio base station uses a predetermined number (for example, four) of upper layer signals from an NB (narrowband) set including a plurality of NBs allocated to the entire system band.
- the NB is notified to the user terminal, and one of the four NBs is designated by DCI (Downlink Control Information).
- DCI Downlink Control Information
- the user terminal controls signal transmission and / or reception using the PRB constituting the designated NB. For example, it is assumed that NB # 1, # 3, # 8, and # 13 are designated in advance by an upper layer signal.
- the MTC terminal selects a specific NB designated by DCI, for example, NB # 1, from the selected four NBs.
- the radio base station and / or the MTC terminal controls signal transmission / reception using all or a part of PRB # 6- # 11 constituting NB # 1.
- the PRB number targeted by the DCI resource allocation (RA) field is The number of PRBs to be specified by the RA field decreases from the entire band to the number of PRBs selected in advance by the upper layer signal. As a result, the bit size required for DCI to specify a specific PRB in the RA field can be suppressed.
- the band targeted for CSI measurement Channel State Information Measurement
- the power consumption required for the MTC terminal can be suppressed.
- FIG. 2 shows a correspondence relationship between the length of the entire system band and the number of PRBs per RBG. As shown in FIG. 2, in the existing system, the number of PRBs constituting one RGG is set differently according to the system band.
- FIG. 3 is a diagram showing an example of the arrangement of NB, RBG, and PRB in the system band. As shown in FIG. 3, when an MTC terminal performs wireless communication with a wireless base station, it is assumed that an existing user terminal also performs wireless communication with the wireless base station.
- FIG. 3 is an example of resource allocation when the system band is configured from 100 PRB.
- 1 RBG which is a data allocation unit of an existing user terminal (legacy terminal) is configured with 4 PRBs.
- the MTC terminal can use 16 NBs composed of 6 PRBs and 1 NB composed of 4 PRBs (100 PRBs in total).
- RBG # 1 is composed of PRB # 4- # 7
- RBG # 4 is composed of PRB # 16- # 19.
- PRB # 4- # 5 constitutes part of NB # 1
- PRB # 6- # 7 constitutes part of NB # 1
- PRB # 16- # 17 constitutes part of NB # 2.
- PRB # 18-19 forms part of NB # 3.
- the radio base station gives priority to data allocation to the existing user terminal over the MTC terminal, the PRB overlapping with the RBG on the NB cannot be used for the MTC terminal.
- the MTC terminal can use only a part of the PRBs constituting NB # 0- # 3. Therefore, in the case shown in FIG. 3, the MTC terminal can use only a part of its resources in all the NBs, and the throughput of the MTC terminal decreases.
- the resource allocation of the NB is performed so as to prevent the throughput of the MTC terminal from being reduced in response to the resource allocation of the RBG used by the existing terminal. It has become a problem to control.
- the present inventors paid attention to the fact that the position of the PRB that overlaps between the NB and the RBG can be controlled by applying the frequency shift, and shifted in the frequency direction in the radio communication between the MTC terminal and the radio base station.
- the idea was to use multiple NB sets.
- an appropriate NB set is selected from a plurality of NB sets shifted in the frequency direction in consideration of the arrangement of RBGs, and the radio base station uses the NB included in the selected NB set. Communicate with the station.
- the radio base station uses the NB included in the selected NB set. Communicate with the station.
- an MTC terminal is illustrated as a user terminal whose usage band is limited to a narrow band
- application of the present invention is not limited to an MTC terminal.
- the narrow band is described as 6PRB (1.4 MHz), the present invention can be applied based on the present specification even in other narrow bands.
- PDSCH Physical Downlink Shared Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- two NB sets are set between the MTC terminal and the radio base station.
- the number of NB sets is not limited to 2.
- three or more NB sets may be set and used, and the NB arrangement method is limited to the following example. I can't.
- an existing user terminal communicates with a radio base station using an RBG
- an MTC terminal performs downlink and / or uplink communication with a radio base station using two NB sets.
- the arrangement of radio resources in the NB set will be described.
- FIG. 4 is a diagram illustrating an example of arrangement of radio resources according to the first embodiment.
- an existing user terminal is assigned an RBG set for communication with a radio base station
- an MTC terminal is assigned an NB1 set and an NB2 set for communication with the radio base station.
- the NB1 set and the NB2 set are composed of 16 6PRBs and 1 4PRB as in FIG. 2 described above. Note that the band constituted by 4PRBs may not be used for data transmission / reception.
- NB1 # 16 (not shown in FIG. 4A) configuring the NB1 set is configured by 4PRB
- NB2 # 0 configuring the NB2 set is configured by 4PRB.
- the NB2 set is shifted (moved) by 2 PRB to the left compared to the NB1 set.
- the NB1 set and the NB2 set are composed of 6PRBs except for the 1NB at the end, and the other is composed of 6PRBs.
- the PRBs constituting the NBs are Different. For example, NB1 # 1 is composed of PRB # 6- # 11, and NB2 # 1 is composed of PRB # 4- # 9.
- the radio base station applies different frequency shifts to the NB set 1 and the NB set 2. That is, the radio base station selects a predetermined NB set from a plurality of NB sets to which the frequency shift is applied, and assigns data to the MTC terminal. In addition, the MTC terminal selects either the NB1 set or the NB2 set, and performs radio communication with the radio base station using the NBs constituting the NB set.
- Whether the NB included in the NB1 set or the NB2 set is used for wireless communication can be dynamically controlled by including information in the DCI transmitted by the wireless base station. For example, a new bit may be added to the DCI and used to specify whether the radio base station uses the NB1 set or the NB2 set, or the existing 1 bit of the DCI may be used as the NB1 set, NB2 It may be used to specify any of the sets.
- the information included in the DCI may be information necessary for the MTC terminal to select an appropriate NB set. For example, it may be information that explicitly designates either NB1 or NB2, or may be information that designates either NB1 or NB2 implicitly.
- the MTC terminal can use only a part of the NB resources.
- NB2 # 2 is used for the MTC terminal.
- 6PRB can be used. In this way, by using the NB included in the selected NB set, the MTC terminal can perform radio communication with the radio base station using the downlink signal or the uplink signal.
- the conventional method reduces throughput. Even in such a situation, it is possible to suppress a decrease in throughput.
- the first embodiment it is possible to suppress a decrease in the throughput of the MTC terminal even in a scene where the throughput of the MTC terminal decreases in the conventional method.
- the NB arrangement shown in FIG. 4A is merely an example.
- the NB set may not have a configuration in which a plurality of NBs are continuously arranged in the frequency direction.
- FIG. 4B a configuration may be employed in which a plurality of NBs are separated in the frequency direction (discontinuously in the frequency direction) in each NB set.
- 6PRB is used by using NB1 # 1 and NB2 # 2.
- the MTC terminal can communicate with the radio base station. As a result, it is possible to suppress a decrease in throughput of the MTC terminal.
- the number of NBs configuring the NB set can be reduced, and the number of NBs allocated to the MTC terminal can be decreased.
- RBG does not need to be comprised by 4PRB, for example, it may be comprised by 3 PRB or less, or may be comprised by 5 PRB or more.
- the number of NB sets to be used is not limited to two. For example, a configuration using three or more NB sets may be used.
- the MTC terminal may select a predetermined NB set from the plurality of NB sets to which different frequency shifts are applied.
- the size of the NB constituting the NB set is not limited to 6 PRB.
- the NB may be composed of 5 or less PRBs, or may be composed of 7 or more PRBs.
- the shift amount of the plurality of NB sets is not limited to the above-described method, and may be set as appropriate according to the PBG size, the number of NB sets, and the NB size.
- the frequency shift amount between NB sets may be any of 2PRB, 3PRB, and 4PRB. In this case, it is preferable that a certain NB set has a frequency shift of 2PRB, 3PRB, and 4PRB applied to other NB sets.
- the shift amounts of the plurality of NB sets may be determined according to the position of the RBG actually used in the RBG set.
- the shift amount of the NB set may be determined corresponding to the position of the unused RBG in the RBG set.
- FIG. 5 is a diagram illustrating an example of radio resource arrangement according to the second embodiment.
- FIG. 5 describes scheduling of signals received by the MTC terminal in the time axis direction in the two NBs.
- MPDCCH MTC Physical Downlink Control Channel
- PDCCH PDCCH for MTC
- MPDCCH may be a signal based on EPDCCH.
- MPDCCH and EPDCCH may be collectively referred to as a control signal.
- EPDCCH is also included.
- FIG. 5A describes a frequency scheduling method using MPDCCH
- FIG. 5B describes a frequency scheduling method according to the second embodiment using MPDCCH.
- the two NBs in FIG. 5 may be selected from, for example, the same NB set in the two NB sets shown in the first embodiment, or may be selected from different NB sets. Other NBs may be used.
- FIG. 5 shows that the frequency retuning is performed when the MTC terminal receives MPDCCH and EPDCCH. Further, a portion surrounded by a bold rectangle indicates a period (subframe) in which the MTC terminal monitors the MPDCCH.
- MPDCCH may include information for scheduling assignment of PDSCH (Scheduling assignment).
- the information for scheduling assignment may include information indicating the resource location of PDSCH, for example.
- the information indicating the resource position of the PDSCH may be, for example, a PRB index (for example, 0 to 5) indicating the position of the PRB in a predetermined narrow band (for example, 6 PRB), or from the resource position of the MPDCCH. It may be a relative frequency offset. Note that the MTC terminal may implicitly grasp the PDSCH resource location based on the MPDCCH resource location.
- a frequency scheduling method in an MTC terminal using MPDCCH will be described with reference to FIG. 5A.
- the user terminal detects (monitors) MPDCCH in a predetermined area (narrowband, NB) notified in advance by higher layer signaling or the like.
- MTC-SIB MTC-System Information Block
- RAR Random Access Response
- Message 4 Message 4
- the MTC terminal performs monitoring for MPDCCH reception in the NB specified by higher layer signaling.
- the MTC terminal receives the MPDCCH
- the PDSCH may be assigned to the same NB as the MPDCCH or may be assigned to a different NB.
- PDSCH reception processing is performed by an NB different from the NB that has received the MPDCCH based on information included in the received MPDCCH, it differs from the NB that has received the MPDCCH after a certain period required for frequency retuning.
- the NB performs PDSCH reception processing.
- the MTC terminal performs monitoring for MPDCCH reception again at the NB that first received the MPDCCH after elapse of a certain period necessary for retuning.
- the above method has an advantage that there is no ambiguity in the selection of the NB because the NB that receives the MPDCCH is fixed.
- the MTC terminal always receives the MPDCCH by a specific NB and the NB that has received the PDSCH is a different NB from the NB that has received the MPDCCH, the frequency retuning is performed each time the MTC terminal changes the NB. Occurs.
- FIG. 5B describes a frequency scheduling method considering these points. Further, description of the same points as the above-described method is omitted.
- the MTC terminal when the MTC terminal receives the MPDCCH, the MTC terminal receives the PDSCH based on the information included in the MPDCCH.
- the NB for monitoring the MPDCCH is not limited to one NB.
- the MTC terminal changes the NB that detects the MPDCCH based on the NB that has received the PDSCH. That is, the MTC terminal controls to perform MPDCCH monitoring in the NB that has received the PDSCH.
- MPDCCH EPDCCH
- MPDCCH can be distributed and allocated to different NBs, so that it is possible to prevent the load from being concentrated on a specific NB.
- DCI included in MPDCCH can be offloaded to NB in a good channel state.
- CQI Channel Quality Indicator
- the monitoring target is set to a predetermined NB. You may control to change.
- FIG. 6 is a diagram illustrating an example of radio resource arrangement according to the third embodiment.
- FIG. 6 illustrates three cases for subframe (SF) scheduling.
- the two NBs in FIG. 6 may be selected from the same NB set or selected from different NB sets in the two NB sets shown in the first embodiment, for example. Other NBs may be used.
- this NB may be comprised by 6PRB, and may be comprised by the number of PRB other than that.
- the MTC terminal is prescribed different operations according to the position of the PDSCH indicated by the RA field included in the DCI of the received EPDCCH. Specifically, the MTC terminal determines the PDSCH depending on the subframe position (PRB position) of EPDCCH (including MPDCCH. These may be collectively referred to as downlink control channels) and the PDSCH subframe position indicated by the RA field. Is determined.
- PRB position subframe position of EPDCCH
- MPDCCH including MPDCCH.
- the SF scheduling in the third embodiment is divided into the following three cases according to the position of the PRSCH of the PDSCH, and the MTC terminal determines which of the cases (1) to (3) is performed according to the transmitted information. It is judged whether it is.
- Case (1) When a PRB that is the same as the EPDCCH and a PRB different from the PRDCCH is designated as the PDSCH PRB, it is determined that the same SF-scheduling (same subframe scheduling) is performed.
- Case (2) If the same NB as the EPDCCH is specified as the PRSCH of the PDSCH and at least a part of the PRB is specified as the EPDCCH, it is determined that Cross SF-scheduling (cross subframe scheduling) is performed.
- Case (3) When an NB different from the EPDCCH is designated as the PDSCH PRB, it is determined to be Cross SF-scheduling.
- the MTC terminal determines whether the NB to which the EPDCCH is assigned and the NB to which the PDSCH specified by the EPDCCH is assigned are the same.
- the MTC terminal cannot receive PDSCH in the current NB. In this case, the MTC terminal determines that the Case is (3) Cross SF-scheduling. In this case, for example, since the NB in which the EPDCCH is arranged is different from the NB in which the PDSCH is arranged, the frequency is changed.
- the MTC terminal determines whether the PRB to which the EPDCCH is assigned and the PRB to which the PDSCH is assigned are the same.
- the MTC terminal when the PRB assigned to the EPDCCH and the PRB assigned to the PDSCH are arranged in the same NB and these PRBs do not overlap, the MTF terminal is in the Same SF-scheduling of case (1). to decide. Also, if there is some overlap in the PRB assigned to the EPDCCH and the PDSCH, the MTC terminal determines that it is the Cross SF-scheduling of Case (2).
- the MTC terminal determines that the PDSCH is arranged at a position different from the EPDCCH as described above, and receives the EPDCCH and the PDSCH.
- Cross SF-scheduling and Same SF-scheduling can be dynamically switched without adding signaling or the like by judging the scheduling type based on the information regarding the PDSCH arrangement specified by RA included in the EPDCCH by the MTC terminal. .
- EPDCCH and PDSCH are arranged as described in case (2), an example is shown in which Cross SF-scheduling is performed by assigning PDSCH to adjacent subframes. It is not restricted to the above-mentioned example. For example, a method may be used in which the PDSCH is scheduled not at a position adjacent to the EPDCCH but at a position at least one subframe apart.
- the EPDCCH and the PDSCH may occupy the same PRB when the position of the PDSCH specified by the RA is the same NB as the EPDCCH. Recognize. In this case, Cross SF-scheduling may be determined without using information related to PDSCH.
- the radio base station may arrange PDSCH in consideration of retuning (for example, for one subframe).
- the SF scheduling type may be changeable by transmitting information on the SF scheduling type to the MTC terminal.
- the information may be transmitted using DCI, or the information may be transmitted using an upper layer signal rig.
- the transmission frequency of DCI is higher than the transmission frequency of upper layer signaling
- a notification is made using DCI, and non-dynamic scheduling (fixed scheduling is performed). ), It is preferable that the notification is made using higher layer signaling.
- the MTC terminal sets the SF scheduling type based on the relationship between the EPDCCH and the PDSCH. No need to judge. This makes it possible to reduce the processing load on the MTC terminal and reduce the power consumption.
- wireless communication system Wireless communication system
- wireless communication method which concerns on said each embodiment may each be applied independently, and may be applied in combination.
- an MTC terminal is illustrated as a user terminal (UE) whose use band is limited to a narrow band, but is not limited to an MTC terminal.
- UE user terminal
- FIG. 7 is a schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
- a wireless communication system 1 shown in FIG. 7 is an example in which an LTE system is adopted in a network domain of a machine communication system.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit can be applied.
- the LTE system is assumed to be set to a maximum system bandwidth of 20 MHz for both downlink and uplink, but is not limited to this configuration.
- the wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), or the like.
- the wireless communication system 1 includes a wireless base station 10 and a plurality of user terminals 20A, 20B, and 20C that are wirelessly connected to the wireless base station 10.
- the radio base station 10 is connected to the higher station apparatus 30 and is connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- the plurality of user terminals 20 ⁇ / b> A, 20 ⁇ / b> B, and 20 ⁇ / b> C can communicate with the radio base station 10 in the cell 50.
- the user terminal 20A is a user terminal (hereinafter, LTE terminal) that supports LTE (up to Rel-10) or LTE-Advanced (including Rel-10 and later), and the other user terminals 20B and 20C are machine
- the MTC terminal is a communication device in the communication system.
- the user terminals 20 ⁇ / b> A, 20 ⁇ / b> B, and 20 ⁇ / b> C are simply referred to as the user terminal 20 unless it is necessary to distinguish between them.
- the MTC terminals 20B and 20C are terminals compatible with various communication systems such as LTE and LTE-A, and are not limited to fixed communication terminals such as electric meters, gas meters, and vending machines, but also mobile communication terminals such as vehicles. Good. Further, the user terminal 20 may communicate directly with another user terminal 20 or may communicate via the radio base station 10.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access methods are not limited to these combinations.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, and predetermined SIB (System Information Block) are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), MPDCCH (MTC PDCCH), etc. including.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the HAICH transmission confirmation signal (ACK / NACK) for PUSCH is transmitted by PHICH.
- the EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH.
- the MPDCCH is a PDCCH (PDCCH for MTC) used for an MTC terminal, and is used for transmission of DCI and the like in the same way as the PDCCH and EPDCCH.
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH) shared by each user terminal 20 are used. Physical Random Access Channel) is used.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH random access channel
- Physical Random Access Channel Physical Random Access Channel
- User data and higher layer control information are transmitted by PUSCH.
- downlink radio quality information (CQI: Channel Quality Indicator), a delivery confirmation signal, and the like are transmitted by PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- FIG. 8 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to each transmitting / receiving unit 103.
- Each transmission / reception unit 103 converts the baseband signal output by precoding from the baseband signal processing unit 104 for each antenna to a radio frequency band and transmits the converted signal.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device which is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can transmit and receive various signals with a narrow bandwidth (for example, 1.4 MHz) limited by the system bandwidth (for example, one component carrier).
- the transmission / reception unit 103 can send a CDI for selecting a narrow band for a plurality of narrow band sets in which a plurality of narrow bands are continuously formed in the frequency direction. In addition, the plurality of narrowband sets may be shifted in the frequency direction. Also, the transmission / reception unit 103 may transmit to the user terminal 20 information necessary for monitoring a subframe received by the EPDCCH and information related to a PRB (Physical Resource Block) constituting the PDSCH, EPDCCH, and the like. Good.
- PRB Physical Resource Block
- the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102.
- Each transmitting / receiving unit 103 receives the upstream signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- FIG. 9 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment of the present invention. Note that FIG. 9 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes a control unit (scheduler) 301, a transmission signal generation unit (generation unit) 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. It is equipped with.
- the control unit (scheduler) 301 controls the entire radio base station 10.
- the control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
- the control unit 301 controls signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example.
- the control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
- the control unit 301 controls scheduling (for example, resource allocation) of system information, a downlink data signal transmitted by PDSCH, and a downlink control signal transmitted by PDCCH and / or EPDCCH (MPDCCH). It also controls scheduling of synchronization signals and downlink reference signals such as CRS (Cell-specific Reference Signal), CSI-RS (Channel State Information Reference Signal), DM-RS (Demodulation Reference Signal).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DM-RS Demodulation Reference Signal
- the control unit 301 also transmits an uplink data signal transmitted on the PUSCH, an uplink control signal transmitted on the PUCCH and / or PUSCH (for example, a delivery confirmation signal (HARQ-ACK)), a random access preamble transmitted on the PRACH, Controls scheduling of uplink reference signals and the like.
- an uplink data signal transmitted on the PUSCH for example, an uplink control signal transmitted on the PUCCH and / or PUSCH (for example, a delivery confirmation signal (HARQ-ACK)), a random access preamble transmitted on the PRACH, Controls scheduling of uplink reference signals and the like.
- HARQ-ACK delivery confirmation signal
- the control unit 301 controls the transmission signal generation unit 302 and the mapping unit 303 so that various signals are allocated to a narrow band and transmitted to the user terminal 20.
- the control unit 301 performs control so that downlink broadcast information (MIB, SIB), EPDCCH, PDSCH, and the like are transmitted in a narrow band.
- MIB downlink broadcast information
- SIB downlink broadcast information
- control unit 301 controls the allocation of RBG (Resource Block Group) configured by a predetermined number of PRBs (Physical Resource Blocks) according to the width of the system band.
- RBG Resource Block Group
- the RBG is used for communication with the user terminal 20A, for example.
- the control unit 301 controls allocation of a narrow band (NB: Narrow Nand) composed of a predetermined number of PRBs (for example, 6 PRBs).
- the NB is used for communication with the user terminals 20B and 20C, for example.
- a plurality of NBs may be set.
- RBG and NB are continuously arranged in the frequency direction, and are called an RBG set and an NB set.
- the control unit 301 controls the amount of shift in the frequency direction of at least one NB set of the plurality of NB sets according to the PRB that configures the RBG to be used. Specifically, the control unit 301 may control the shift amount so that the PRB constituting the RBG to be used does not overlap with the PRB constituting the NB of the NB set shifted in the frequency direction (first). Embodiment). In this case, the control unit 301 may perform control so as to notify the user terminals 20B and 20C of an instruction to switch the NB set to be used among the plurality of NB sets. In this case, the control unit 301 may perform control so as to have a configuration for notifying the user terminals 20B and 20C using DCI or the like.
- the control unit 301 may perform control so that the EPDCCH is always transmitted to a predetermined NB. Further, the control unit 301 may notify a predetermined NB for transmitting the EPDCCH by an upper layer signal (for example, MTC-SIB, RAR (Random Access Response), Message 4), DCI, or the like. Moreover, the control part 301 may control the transmission signal generation part 302 so that EPDCCH may be transmitted by NB which transmitted PDSCH to the user terminal 20 (2nd Embodiment).
- an upper layer signal for example, MTC-SIB, RAR (Random Access Response), Message 4
- control unit 301 controls the user terminal 20 to transmit information necessary for monitoring the EPDCCH (for example, the number of subframes for monitoring the EPDCCH, information for specifying the NB to be monitored, etc.). May be.
- the control unit 301 may perform control so as to notify the user terminal 20 of information related to the NB and PRB that transmit the PDSCH according to an RA (Resource Allocation) field included in the DCI of the received EPDCCH (third embodiment). ). Further, the control unit 301 may control the subframe position for transmitting the EPDCCH and the PDSCH to the user terminal 20 according to the relationship between the EPDCCH PRB and the PDSCH PRB.
- RA Resource Allocation
- the control unit 301 controls to notify whether scheduling in the same subframe (Same SF-scheduling) or scheduling in a different subframe (Cross SF-scheduling) is performed by DCI or higher layer signal. (Modification of the third embodiment).
- the transmission signal generation unit (generation unit) 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303.
- the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301. Further, the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI) from each user terminal 20.
- CSI channel state information
- the transmission signal generation unit 302 outputs to the mapping unit 303 a signal including information on the NB set that has been frequency-shifted according to the frequency shift amount set for the NB.
- the transmission signal generation unit 302 Based on an instruction from the control unit 301, the transmission signal generation unit 302 generates DCI including RA including information related to the PDSCH position, and outputs the DCI to the mapping unit 303.
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined narrowband radio resource (for example, a maximum of 6 resource blocks) based on an instruction from the control unit 301, and transmits and receives To 103. Further, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource (for example, RBG) based on an instruction from the control unit 301 and outputs the mapped signal to the transmission / reception unit 103.
- the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
- the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301.
- the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 may measure, for example, received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 301.
- FIG. 10 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a transmission / reception antenna 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the user terminal 20 may include a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, and the like.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission / reception unit 203 can receive DCI for selecting a narrow band for a plurality of narrow band sets in which a plurality of narrow bands are configured continuously or discontinuously in the frequency direction. In addition, the plurality of narrowband sets may be shifted in the frequency direction. Further, the transmission / reception unit 203 may receive from the radio base station 10 information necessary for monitoring a subframe received by the EPDCCH, and information related to a PRB (Physical Resource Block) constituting the PDSCH, EPDCCH, and the like. .
- PRB Physical Resource Block
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- FIG. 11 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. Note that FIG. 11 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit (generation unit) 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit. 405.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403.
- the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
- the control unit 401 obtains, from the reception signal processing unit 404, a downlink control signal (signal transmitted by PDCCH / EPDCCH (MPDCCH)) and a downlink data signal (signal transmitted by PDSCH) transmitted from the radio base station 10. To do.
- the control unit 401 generates an uplink control signal (for example, an acknowledgment signal (HARQ-ACK)) or an uplink data signal based on a downlink control signal, a result of determining whether retransmission control is necessary for the downlink data signal, or the like. To control.
- HARQ-ACK acknowledgment signal
- control unit 401 can determine the mode of the own terminal based on the information.
- the control unit 401 selects an NB set to be used for transmission / reception of signals with the radio base station 10 from a plurality of NB sets based on information included in DCI transmitted from the radio base station 10 (first embodiment). . And the control part 401 communicates with the wireless base station 10 using NB of the selected NB set. Further, the control unit 401 controls the reception signal processing unit 404 and the measurement unit 405 according to the selection of the NB.
- the control unit 401 may perform control so that the upper layer signaling (for example, MTC-SIC, RAR, Message4, etc.) transmitted from the radio base station 10 or the NB notified by DCI receives the EPDCCH. Further, the control unit 401 may perform control so that the NB that has received the PDSCH receives the EPDCCH. In this case, the control unit 401 may control to receive the EPDCCH in the NB that finally received the PDSCH (second embodiment).
- the upper layer signaling for example, MTC-SIC, RAR, Message4, etc.
- control unit 401 changes the EPDCCH according to information necessary for monitoring the EPDCCH transmitted from the radio base station (for example, the number of subframes for monitoring the EPDCCH, information for specifying the NB to be monitored, etc.). You may control to monitor.
- control unit 401 determines the PDSCH reception position based on information related to the PDSCH specified by the information included in the RA field included in the DCI of the received EPDCCH (for example, information on the PRB of the NB or PDSCH). May be. In this case, the control unit 401 may perform control so as to appropriately determine “same SF Scheduling” and “cross SF Scheduling” according to the positional relationship between the EPDCCH and the PDSCH in the NB (third embodiment).
- control unit 401 may perform switching between the same SF Scheduling and the cross SF Scheduling on the notified signal. Specifically, the control unit 401 may perform switching based on the received DCI or an upper layer signal.
- the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403.
- the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates an uplink control signal related to a delivery confirmation signal (HARQ-ACK) or channel state information (CSI) based on an instruction from the control unit 401, for example.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- the mapping unit 403 Based on an instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource (for example, a maximum of 6 resource blocks) and outputs the radio signal to the transmission / reception unit 203.
- the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
- the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10.
- the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the reception signal processing unit 404 applies reception processing to the reception signal from the radio base station 10.
- Reception signal processing section 404 outputs information decoded by the reception processing to control section 401.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 may measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 401.
- each functional block is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- the radio base station 10 and the user terminal 20 are realized using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array). May be.
- the radio base station 10 and the user terminal 20 are each a computer device including a processor (CPU: Central Processing Unit), a communication interface for network connection, a memory, and a computer-readable storage medium holding a program. It may be realized. That is, the radio base station, user terminal, and the like according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method according to the present invention.
- Computer-readable recording media include, for example, flexible disks, magneto-optical disks, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), CD-ROM (Compact Disc-ROM), RAM (Random Access Memory), A storage medium such as a hard disk.
- the program may be transmitted from a network via a telecommunication line.
- the radio base station 10 and the user terminal 20 may include an input device such as an input key and an output device such as a display.
- the functional configurations of the radio base station 10 and the user terminal 20 may be realized by the hardware described above, may be realized by a software module executed by a processor, or may be realized by a combination of both.
- the processor controls the entire user terminal by operating an operating system. Further, the processor reads programs, software modules and data from the storage medium into the memory, and executes various processes according to these.
- the program may be a program that causes a computer to execute the operations described in the above embodiments.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in a memory and operated by a processor, and may be realized similarly for other functional blocks.
- software, instructions, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave.
- DSL digital subscriber line
- wireless technology such as infrared, wireless and microwave.
- the radio resource may be indicated by an index.
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be called a carrier frequency, a cell, or the like.
- notification of predetermined information is not limited to explicitly performed, and may be performed implicitly (for example, notification of the predetermined information is not performed). Good.
- notification of information is not limited to the aspect / embodiment shown in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
- the RRC signaling may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the information, signals, etc. shown in this specification may be represented using any of a variety of different technologies.
- data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of
- Each aspect / embodiment shown in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 5G
- FRA Full Radio Access
- CDMA2000 Code Division Multiple Access 2000
- UMB User Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX
- IEEE 802.20 UWB (Ultra-WideBand)
- Bluetooth registered trademark
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
第1の実施形態では、既存のユーザ端末が無線基地局とRBGを用いて通信を行い、MTC端末が2つのNBセットを用いて無線基地局と下りリンク及び/又は上りリンク通信を行う場合の、NBセットの無線リソースの配置について説明する。
なお、図4Aに示したNBの配置は一例に過ぎない。例えば、NBセットは、複数NBが周波数方向に連続して配置される構成でなくてもよい。具体的には、図4Bに示すように、各NBセットにおいて複数のNBがそれぞれ周波数方向に離されて(周波数方向に非連続で)配置される構成であってもよい。図4Bに示す例であれば、通常のユーザ端末がRBG#1、#4を用いてデータ通信を行う場合であっても、NB1#1や、NB2#2を用いることによって、6PRBを用いてMTC端末が無線基地局と通信を行うことが可能となる。これによりMTC端末のスループットの低下を抑制することが可能となる。また、図4BのようにNBセットを構成することで、NBセットを構成するNBの数を減少させることが可能となり、MTC端末に割り当てるNBの個数を減少させることができる。
第2の実施形態では、下り制御チャネルを検出(モニタ)する周波数位置をPDSCH(Physical Downlink Shared Channel)に基づいて制御する場合について説明する。
第3の実施形態では、クロスサブフレームスケジューリング(SF Scheduling)と同一サブフレームスケジューリングの適用について説明する。なお、同一サブフレームスケジューリングを適用するMTC端末としては、Normal Coverage UE、周波数ホッピングを用いるが繰り返しの少ないSmall enhancement Coverage UEとすることができる。
ケース(1):PDSCHのPRBとして、EPDCCHと同一のNBで、EPDCCHのPRBと異なるPRBを指定した場合は、Same SF-scheduling(同一サブフレームスケジューリング)であると判断する。
ケース(2):PDSCHのPRBとして、EPDCCHと同一のNBで、少なくとも一部がEPDCCHと同一のPRBを指定した場合は、Cross SF-scheduling(クロスサブフレームスケジューリング)であると判断する。
ケース(3):PDSCHのPRBとして、EPDCCHと異なるNBを指定した場合には、Cross SF-schedulingであると判断する。
上述した例では、EPDCCHと、PDSCHのNB上での配置に応じて、Same SF-scheduling及びCross SF-schedulingを切り替える構成としたがこれに限らない。SFスケジューリングのタイプに関する情報をMTC端末に送信することで、SFスケジューリングのタイプを変更可能としてもよい。例えば、DCIを用いて当該情報を送信する構成としてもよいし、上位レイヤシグナリグを用いて当該情報を送信する構成としてもよい。この場合、DCIの送信頻度は上位レイヤシグナリングの送信頻度に比べて高頻度であるため、動的なスケジューリングの場合にはDCIを用いて通知する構成とし、動的ではないスケジューリング(固定的なスケジューリング)の場合には、上位レイヤシグナリングを用いて通知する構成とすることが好ましい。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上述した本発明の実施形態に係る無線通信方法が適用される。なお、上記の各実施形態に係る無線通信方法は、それぞれ単独で適用されてもよいし、組み合わせて適用されてもよい。ここでは、狭帯域に利用帯域が制限されたユーザ端末(UE)としてMTC端末を例示するが、MTC端末に限定されるものではない。
図8は、本発明の一実施形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。
図10は、本発明の一実施形態に係るユーザ端末の全体構成の一例を示す図である。なお、ここでは詳細な説明を省略するが、通常のLTE端末がMTC端末として振る舞うように動作してもよい。ユーザ端末20は、送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。また、ユーザ端末20は、送受信アンテナ201、アンプ部202、送受信部203などを複数備えてもよい。
Claims (10)
- システム帯域の一部の狭帯域に使用帯域が制限されたユーザ端末であって、
複数の狭帯域で構成される所定の狭帯域セットを選択する制御部と、
前記所定の狭帯域セットに含まれる狭帯域で下り信号を受信する受信部と、を有し、
前記制御部は、前記所定の狭帯域セットを、それぞれ異なる周波数シフトが適用される複数の狭帯域セットから選択することを特徴とするユーザ端末。 - 前記複数の狭帯域セットのうち、1つの狭帯域セットは、他の狭帯域セットに比べて2PRB(Physical Resource Block)以上4PRB以下の周波数シフトが適用されることを特徴とする請求項1に記載のユーザ端末。
- 前記受信部は、DCI(Downlink Control Information)を受信し、
前記制御部は、前記DCIに基づいて、前記所定の狭帯域セットを選択することを特徴とする請求項1又は2に記載のユーザ端末。 - 前記受信部は、PDSCH(Physical Downlink Shared Channel)を受信し、前記PDSCHを受信した狭帯域で下り制御チャネルの検出を行うことを特徴とする請求項1から3のいずれかに記載のユーザ端末。
- 前記受信部は、下り制御チャネルのPRBと、下り制御チャネルで送信されるDCIのRA(Resource Allocation)フィールドによって指定されるPDSCHのPRBと、の位置関係に応じて、同一サブフレームスケジューリングされた信号又はクロスサブフレームスケジューリングされた信号の受信処理を行うことを特徴とする請求項1から4のいずれかに記載のユーザ端末。
- 前記受信部は、前記下り制御チャネルのPRBの位置と、前記RAフィールドによって指定されるPDSCHのPRBの位置と、が同一の狭帯域であって異なるPRBである場合には、同一サブフレームスケジューリングを適用された信号を受信することを特徴とする請求項5に記載のユーザ端末。
- 前記受信部は、前記下り制御チャネルのPRBの位置と、前記RAフィールドによって指定されるPDSCHのPRBの位置と、が同一の狭帯域であって少なくとも一部が重複するPRBである場合には、クロスサブフレームスケジューリングを適用された信号を受信することを特徴とする請求項5に記載のユーザ端末。
- システム帯域の一部の狭帯域に使用帯域が制限されたユーザ端末と通信する無線基地局であって、
複数の狭帯域で構成される複数の狭帯域セットのそれぞれに異なる周波数シフトを適用する制御部と、
前記所定の狭帯域セットに含まれる狭帯域で下り信号を送信する送信部と、を有することを特徴とする無線基地局。 - システム帯域の一部の狭帯域に使用帯域が制限されたユーザ端末が無線基地局と通信する無線通信システムであって、
複数の狭帯域で構成される所定の狭帯域セットを選択する制御部と、
前記所定の狭帯域セットに含まれる狭帯域で下り信号を受信する受信部と、を有し、
前記制御部は、前記所定の狭帯域セットを、それぞれ異なる周波数シフトが適用される複数の狭帯域セットから選択することを特徴とする無線通信システム。 - システム帯域の一部の狭帯域に使用帯域が制限されたユーザ端末が無線基地局と通信する無線通信方法であって、
複数の狭帯域で構成される所定の狭帯域セットを選択する工程と、
前記所定の狭帯域セットに含まれる狭帯域で下り信号を受信する工程と、を有し、
前記所定の狭帯域セットを、それぞれ異なる周波数シフトが適用される複数の狭帯域セットから選択することを特徴とする無線通信方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680027922.9A CN107534967A (zh) | 2015-05-14 | 2016-05-13 | 用户终端、无线基站、无线通信系统以及无线通信方法 |
JP2017518000A JPWO2016182050A1 (ja) | 2015-05-14 | 2016-05-13 | ユーザ端末、無線基地局、無線通信システム及び無線通信方法 |
US15/572,807 US20180124752A1 (en) | 2015-05-14 | 2016-05-13 | User terminal, radio base station, radio communication system and radio communication method |
EP16792774.8A EP3297356A1 (en) | 2015-05-14 | 2016-05-13 | User terminal, wireless base station, wireless communication system, and wireless communication method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015-099542 | 2015-05-14 | ||
JP2015099542 | 2015-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016182050A1 true WO2016182050A1 (ja) | 2016-11-17 |
Family
ID=57248869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/064244 WO2016182050A1 (ja) | 2015-05-14 | 2016-05-13 | ユーザ端末、無線基地局、無線通信システム及び無線通信方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20180124752A1 (ja) |
EP (1) | EP3297356A1 (ja) |
JP (1) | JPWO2016182050A1 (ja) |
CN (1) | CN107534967A (ja) |
WO (1) | WO2016182050A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020503808A (ja) * | 2017-01-05 | 2020-01-30 | 日本電気株式会社 | ダウンリンク制御情報の送信および受信のための方法および装置 |
JP2020519167A (ja) * | 2017-05-05 | 2020-06-25 | 華為技術有限公司Huawei Technologies Co.,Ltd. | リソース割り当て方法、ユーザ機器、およびネットワークデバイス |
CN111684847A (zh) * | 2017-12-04 | 2020-09-18 | 株式会社Ntt都科摩 | 用户终端以及无线通信方法 |
US11277223B2 (en) | 2016-05-20 | 2022-03-15 | Apple Inc. | Control channel design for category-A devices |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20230104751A (ko) * | 2016-08-10 | 2023-07-10 | 아이디에이씨 홀딩스, 인크. | 무선망에서 효율적 전력을 절약하기 위한 방법 및 접근법 |
CN108023849A (zh) * | 2016-11-04 | 2018-05-11 | 北京三星通信技术研究有限公司 | 一种信道状态信息的汇报方法和装置 |
BR112019015948A2 (pt) * | 2017-02-02 | 2020-03-24 | Ntt Docomo, Inc. | Terminal e método de radiocomunicação para um terminal |
CN110149706B (zh) * | 2018-02-13 | 2022-09-13 | 中兴通讯股份有限公司 | Pdsch资源分配的方法、装置、基站和存储介质 |
EP3753170B1 (en) | 2018-02-16 | 2021-12-29 | Sony Group Corporation | Telecommunications apparatus, methods and integrated circuit |
CN110831226B (zh) * | 2018-08-08 | 2023-11-21 | 夏普株式会社 | 由用户设备执行的方法以及用户设备 |
US11044679B2 (en) * | 2019-03-27 | 2021-06-22 | Cypress Semiconductor Corporation | Devices, systems and methods for extending the range of a wireless communication system |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9094987B2 (en) * | 2011-09-26 | 2015-07-28 | Electronics And Telecommunications Research Institute | Method for generating random access signal of machine type communication device using narrow bandwidth |
US9596069B2 (en) * | 2011-11-04 | 2017-03-14 | Intel Corporation | Narrow bandwidth device in a broadband network |
CN103379552B (zh) * | 2012-04-24 | 2016-10-05 | 华为技术有限公司 | 一种在宽带系统中支持窄带通信的方法及装置 |
US9591429B2 (en) * | 2012-05-11 | 2017-03-07 | Qualcomm Incorporated | Methods and apparatus for managing machine-type communications |
CN103684675B (zh) * | 2012-09-24 | 2018-10-02 | 夏普株式会社 | 针对窄带用户设备的下行链路控制信息发送/接收方法 |
US9973362B2 (en) * | 2014-03-07 | 2018-05-15 | Huawei Technologies Co., Ltd. | Common broadcast channel low PAPR signaling in massive MIMO systems |
US11057921B2 (en) * | 2014-10-01 | 2021-07-06 | Samsung Electronics Co., Ltd. | System and method for improving spectral efficiency and coverage for user equipments |
EP3243341B1 (en) * | 2015-04-10 | 2019-06-26 | HFI Innovation Inc. | Resource allocation design for low cost machine-type communication |
-
2016
- 2016-05-13 US US15/572,807 patent/US20180124752A1/en not_active Abandoned
- 2016-05-13 EP EP16792774.8A patent/EP3297356A1/en not_active Withdrawn
- 2016-05-13 CN CN201680027922.9A patent/CN107534967A/zh active Pending
- 2016-05-13 WO PCT/JP2016/064244 patent/WO2016182050A1/ja active Application Filing
- 2016-05-13 JP JP2017518000A patent/JPWO2016182050A1/ja active Pending
Non-Patent Citations (3)
Title |
---|
HUAWEI ET AL.: "On cross-subframe scheduling options", 3GPP TSG-RAN WG1#80BIS, R1-151263, 24 April 2015 (2015-04-24), XP050934143 * |
HUAWEI ET AL.: "Supporting FDM for MTC UEs and other UEs", 3GPP TSG-RAN WG1#80, R1-150400, 13 February 2015 (2015-02-13), XP050933609 * |
NTT DOCOMO: "Time and Frequency Relationship for MPDSCH and PDSCH", 3GPP TSG-RAN WG1#81, R1-153320, 16 May 2015 (2015-05-16), XP050973747 * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11277223B2 (en) | 2016-05-20 | 2022-03-15 | Apple Inc. | Control channel design for category-A devices |
JP2020503808A (ja) * | 2017-01-05 | 2020-01-30 | 日本電気株式会社 | ダウンリンク制御情報の送信および受信のための方法および装置 |
US11343034B2 (en) | 2017-01-05 | 2022-05-24 | Nec Corporation | Methods and apparatuses for downlink control information transmission and receiving |
US11683135B2 (en) | 2017-01-05 | 2023-06-20 | Nec Corporation | Methods and apparatuses for downlink control information transmission and receiving |
JP2020519167A (ja) * | 2017-05-05 | 2020-06-25 | 華為技術有限公司Huawei Technologies Co.,Ltd. | リソース割り当て方法、ユーザ機器、およびネットワークデバイス |
CN111491379A (zh) * | 2017-05-05 | 2020-08-04 | 华为技术有限公司 | 资源分配的方法、用户设备和网络设备 |
CN111491379B (zh) * | 2017-05-05 | 2021-05-18 | 华为技术有限公司 | 资源分配的方法、用户设备和网络设备 |
US11089594B2 (en) | 2017-05-05 | 2021-08-10 | Huawei Technologies Co., Ltd. | Resource allocation method, user equipment, and network device |
RU2764150C2 (ru) * | 2017-05-05 | 2022-01-13 | Хуавэй Текнолоджиз Ко., Лтд. | Способ, пользовательское оборудование и сетевое устройство распределения ресурсов |
CN111684847A (zh) * | 2017-12-04 | 2020-09-18 | 株式会社Ntt都科摩 | 用户终端以及无线通信方法 |
CN111684847B (zh) * | 2017-12-04 | 2024-04-30 | 株式会社Ntt都科摩 | 用户终端以及无线通信方法 |
Also Published As
Publication number | Publication date |
---|---|
CN107534967A (zh) | 2018-01-02 |
US20180124752A1 (en) | 2018-05-03 |
JPWO2016182050A1 (ja) | 2018-03-01 |
EP3297356A1 (en) | 2018-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10455579B2 (en) | User terminal, radio base station, and radio communication method | |
WO2017078128A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP6779212B2 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP6153575B2 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2016182050A1 (ja) | ユーザ端末、無線基地局、無線通信システム及び無線通信方法 | |
WO2016072257A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP6472463B2 (ja) | 無線基地局、ユーザ端末及び無線通信方法 | |
WO2016182052A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2017051847A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2017135345A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2017135419A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP6777627B2 (ja) | 無線基地局、ユーザ端末及び無線通信方法 | |
WO2017026513A1 (ja) | ユーザ端末、無線基地局、無線通信方法及び無線通信システム | |
JP2022078322A (ja) | 端末、基地局、通信方法及びシステム | |
WO2017078129A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
CN108702629B (zh) | 用户终端、无线基站以及无线通信方法 | |
JP6153574B2 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP6163181B2 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2016121776A1 (ja) | ユーザ端末および無線通信方法 | |
WO2017135418A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
WO2017135344A1 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
JP2018046589A (ja) | ユーザ端末、無線基地局及び無線通信方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16792774 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15572807 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2017518000 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2016792774 Country of ref document: EP |