WO2017057943A1

WO2017057943A1 - Method for transmitting uplink signal in wireless communication system and device therefor

Info

Publication number: WO2017057943A1
Application number: PCT/KR2016/010964
Authority: WO
Inventors: 황승계; 이윤정; 김봉회; 김기준
Original assignee: 엘지전자(주)
Priority date: 2015-09-30
Filing date: 2016-09-30
Publication date: 2017-04-06

Abstract

The present specification relates to a method by which a terminal transmits an uplink signal in a wireless communication system, comprising the steps of: receiving, from a base station, configuration information of a code pattern related to the transmission of additional information; configuring a first information block by using a phase shift keying (PSK) modulation scheme; configuring a second information block by using phase rotation or tone shifting of the first information block on the basis of the received configuration information of the code pattern; and transmitting an uplink signal, including the first information block and the second information block, to the base station through a single tone having a specific subcarrier spacing.

Description

Method and apparatus for transmitting uplink signal in wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method for transmitting an uplink signal in a wireless communication system and an apparatus for supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

An object of the present specification is to provide a method for supporting single tone transmission in consideration of data rate or power consumption in an NB-IoT (or NB-LTE) system.

In addition, an object of the present disclosure is to provide a method for determining a size of a subcarrier spacing suitable for coverage of a terminal or transmission data characteristics of a terminal.

In addition, the present specification generates a code pattern through phase rotation or tone shifting between symbols or groups of symbols to increase a data rate or increase data and control information. It is an object of the present invention to provide a method for piggybacking and transmitting.

The technical problems to be achieved in the present specification are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In the present specification, a method for transmitting an uplink signal in a wireless communication system, the method performed by a terminal, receiving configuration information of a code pattern related to transmission of additional information from a base station ; Constructing a first information block using a phase shift keying (PSK) modulation scheme; Constructing a second information block using phase rotation or tone shifting of the first information block based on the configuration information of the received code pattern; And transmitting an uplink signal including the first information block and the second information block to the base station through a single tone having a specific subcarrier spacing. .

Also, in the present specification, the first information block includes a plurality of symbols, and the second information block includes phase rotation or tone shifting between symbols or a group of symbols in the first information block. shifting).

In the present specification, the symbol group may be a slot unit, a subframe unit, a resource unit (RU) unit, or a frame unit.

Also, in the present specification, configuration information of the code pattern includes symbol number information indicating the number of symbols included in the first information block, size information indicating the size of the second information block, or the phase rotation or the tone. And at least one of the information indicating the number of times the shifting occurs.

In addition, in the present specification, the configuration information of the code pattern may be received from the base station through RRC (Radio Resource Control) signaling or downlink control information (DCI).

In the present specification, the additional information is the second information block, and the second information block corresponds to the code pattern.

Also, in the present specification, a symbol before the phase rotation or the tone shifting is generated and a symbol after the phase rotation or the tone shifting are generated may use different PSK modulation mapping schemes.

In the present specification, the symbols after the phase rotation or the tone shifting are generated are characterized in that the same PSK modulation mapping scheme is used.

In addition, in the present specification, the size of the second information block is determined based on the number of times of the phase rotation or the tone shifting.

In the present specification, the value of the phase rotation is determined by dividing ∏ by the modulation order of the PSK.

In addition, in the present specification, the second information block may be acknowledgment (ACK) or non-acknowledgement (NACK) information.

In the present specification, it is determined whether the second information block is ACK information or NACK information according to the number of times of the phase rotation or the tone shifting.

In the present specification, the ACK or NACK information is characterized in that it is repeatedly transmitted for a predetermined time to the base station.

In the present specification, the uplink signal is characterized by using NPUSCH (NB-Physical Uplink Shared Channel) format 1.

In addition, in the present specification, the specific subcarrier interval is a subcarrier interval defined in a narrowband (NB) of 200 kHz or less.

In addition, the present specification provides a terminal for transmitting an uplink signal in a wireless communication system, comprising: a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor operatively coupled to the RF unit, the processor receiving configuration information of a code pattern related to transmission of additional information from a base station; Configure a first information block using a phase shift keying (PSK) modulation scheme; Configure a second information block by using phase rotation or tone shifting of the first information block based on the configuration information of the received code pattern; And transmitting an uplink signal including the first information block and the second information block to the base station through a single tone having a specific subcarrier spacing.

In the present invention, by using a single tone transmission method in a CIoT (Cellular IoT) (or NB-IoT or NB-LTE) system, it is possible to satisfy low PAPR performance.

In addition, the present specification is to determine the size of the subcarrier interval to match the coverage of the terminal or the transmission data characteristics of the terminal in the NB-IoT (or NB-LTE) system, thereby increasing the data rate (data rate) or power consumption ( It can reduce the power consumption.

In addition, the present specification may generate a code pattern through phase rotation or tone shifting between symbols or between symbol groups to transmit additional information, thereby increasing data rate. It has an effect.

Effects obtained in the present specification are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical features of the present invention.

1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.

2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.

FIG. 5 shows an example of a form in which PUCCH formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.

6 shows a structure of a CQI channel in the case of a normal CP in a wireless communication system to which the present invention can be applied.

7 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.

8 shows an example of generating and transmitting five SC-FDMA symbols during one slot in a wireless communication system to which the present invention can be applied.

9 shows an example of a component carrier and carrier aggregation in a wireless communication system to which the present invention can be applied.

10 illustrates an example of a subframe structure according to cross carrier scheduling in a wireless communication system to which the present invention can be applied.

11 shows an example of transport channel processing of a UL-SCH in a wireless communication system to which the present invention can be applied.

12 shows an example of a signal processing procedure of an uplink shared channel which is a transport channel in a wireless communication system to which the present invention can be applied.

FIG. 13 illustrates a reference signal pattern mapped to a downlink resource block pair in a wireless communication system to which the present invention can be applied.

14 illustrates an uplink subframe including a sounding reference signal symbol in a wireless communication system to which the present invention can be applied.

15 is a diagram illustrating an example in which legacy PDCCH, PDSCH, and E-PDCCH are multiplexed.

16 shows an example of uplink numerology in the time domain.

17 illustrates an example of time units for uplink of NB-LTE based on a 2.5 kHz subcarrier spacing.

18 is a diagram illustrating an example of an operation system of an NB LTE system to which the method proposed in the present specification can be applied.

19 is a diagram illustrating an example of PUSCH processing in an NB-IoT system to which the method proposed in this specification can be applied.

20 is a diagram illustrating an example of an LTE turbo encoder used for a PUSCH in an NB-IoT system to which the method proposed in this specification can be applied.

FIG. 21 is a diagram illustrating the size of subcarrier spacing according to coverage proposed in the present specification.

FIG. 22 illustrates an example of resource usage in a time domain according to a difference in subcarrier intervals proposed in the present specification.

FIG. 23 is a diagram illustrating another example of resource use in a time domain according to a difference in subcarrier intervals proposed in the present specification.

24 is a flowchart illustrating an example of a single tone transmission method based on the size of the adaptive subcarrier spacing proposed in the present specification.

25 is a diagram illustrating an example of a phase rotation pattern PSK modulation scheme proposed in the present specification.

FIG. 26 is a diagram illustrating an example of a tone shift pattern PSK modulation method proposed in the specification. FIG.

27 is a flowchart illustrating an example of a single tone transmission method using a code pattern proposed in the present specification.

28 shows an example of an internal block diagram of a wireless communication device to which the methods proposed herein can be applied.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. . In addition, a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA It can be used in various radio access systems such as non-orthogonal multiple access. CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

For clarity, the following description focuses on 3GPP LTE / LTE-A, but the technical features of the present invention are not limited thereto.

시스템일반System General

3GPP LTE / LTE-A supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).

Figure 1 (a) illustrates the structure of a type 1 radio frame. A radio frame consists of 10 subframes. One subframe consists of two slots in the time domain. The time taken to transmit one subframe is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. 3GPP LTE uses OFDMA in downlink, so OFDM The symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period. A resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

FIG. 1B illustrates a frame structure type 2. FIG. Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). One subframe consists of two slots. DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. The guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

In a type 2 frame structure of a TDD system, an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes. Table 1 shows an uplink-downlink configuration.

Uplink-Downlink configuration

Downlink-to-Uplink Switch-point periodicity

Subframe number

0

One

2

3

4

5

6

7

8

9

0

5 ms

D

S

U

D

S

U

One

5 ms

D

S

U

D

S

U

D

2

5 ms

D

S

U

D

S

U

D

3

10 ms

D

S

U

D

4

10 ms

D

S

U

D

5

10 ms

D

S

U

D

6

5 ms

D

S

U

D

S

U

D

Referring to Table 1, for each subframe of a radio frame, 'D' represents a subframe for downlink transmission, 'U' represents a subframe for uplink transmission, and 'S' represents DwPTS, GP, UpPTS Indicates a special subframe consisting of three fields. The uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.

The time point when the downlink is changed from the uplink or the time point when the uplink is switched to the downlink is called a switching point. Switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are repeatedly switched in the same manner, and both 5ms or 10ms are supported. In case of having a period of 5ms downlink-uplink switching time, the special subframe S exists every half-frame, and in case of having a period of 5ms downlink-uplink switching time, it exists only in the first half-frame.

In all configurations,

subframes

0 and 5 and DwPTS are sections for downlink transmission only. The subframe immediately following the UpPTS and the subframe subframe is always an interval for uplink transmission.

The uplink-downlink configuration may be known to both the base station and the terminal as system information. When the uplink-downlink configuration information is changed, the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information. In addition, the configuration information is a kind of downlink control information, which may be transmitted through a physical downlink control channel (PDCCH) like other scheduling information, and is commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information. May be

The structure of the radio frame is only one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.

Referring to FIG. 2, one downlink slot includes a plurality of OFDM symbols in the time domain. Here, one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.

Each element on the resource grid is a resource element, and one resource block (RB) includes 12 × 7 resource elements. The number N ^DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.

The structure of the uplink slot may be the same as the structure of the downlink slot.

Referring to FIG. 3, up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated. data region). An example of a downlink control channel used in 3GPP LTE includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.

The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe. The PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ). Control information transmitted through the PDCCH is called downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.

The PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also referred to as a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal It may carry a set of transmission power control commands for the individual terminals in the group, activation of Voice over IP (VoIP), and the like. The plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs. The PDCCH consists of a set of one or a plurality of consecutive CCEs. CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.

The base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH. If the PDCCH for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI) may be masked to the CRC. If the system information, more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC. In order to indicate a random access response that is a response to the transmission of the random access preamble of the UE, a random access-RNTI (RA-RNTI) may be masked to the CRC.

Referring to FIG. 4, an uplink subframe may be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region. The data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data. In order to maintain a single carrier characteristic, one UE does not simultaneously transmit a PUCCH and a PUSCH.

A PUCCH for one UE is allocated a resource block (RB) pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).

물리상향링크제어채널(PUCCH)Physical Uplink Control Channel (PUCCH)

The uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.

HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful. In a conventional wireless communication system, one bit is transmitted as ACK / NACK information for downlink single codeword transmission, and two bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.

Channel measurement information refers to feedback information related to a multiple input multiple output (MIMO) technique, and includes channel quality indicator (CQI), precoding matrix index (PMI), and rank indicator (RI). : Rank Indicator) may be included. These channel measurement information may be collectively expressed as CQI.

20 bits per subframe may be used for transmission of the CQI.

PUCCH may be modulated using Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK). Control information of a plurality of terminals may be transmitted through a PUCCH, and a constant amplitude zero autocorrelation (CAZAC) sequence having a length of 12 is performed when code division multiplexing (CDM) is performed to distinguish signals of respective terminals. Mainly used. Since the CAZAC sequence has a characteristic of maintaining a constant amplitude in the time domain and the frequency domain, the coverage is reduced by reducing the Peak-to-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the UE. It has a suitable property to increase. In addition, ACK / NACK information for downlink data transmission transmitted through the PUCCH is covered using an orthogonal sequence or an orthogonal cover (OC).

In addition, the control information transmitted on the PUCCH may be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values. The cyclically shifted sequence may be generated by cyclically shifting a base sequence by a specific cyclic shift amount. The specific CS amount is indicated by the cyclic shift index (CS index). The number of cyclic shifts available may vary depending on the delay spread of the channel. Various kinds of sequences may be used as the base sequence, and the above-described CAZAC sequence is one example.

In addition, the amount of control information that can be transmitted in one subframe by the UE depends on the number of SC-FDMA symbols available for transmission of the control information (that is, RS transmission for coherent detection of PUCCH). SC-FDMA symbols except for the SC-FDMA symbol used).

In the 3GPP LTE system, PUCCH is defined in seven different formats according to transmitted control information, modulation scheme, amount of control information, and the like, and according to uplink control information (UCI) transmitted according to each PUCCH format, The attributes can be summarized as shown in Table 2 below.

PUCCH FormatPUCCH Format	Uplink Control Information(UCI)Uplink Control Information (UCI)
Format 1 Format 1	Scheduling Request(SR)(unmodulated waveform)Scheduling Request (SR) (unmodulated waveform)
Format 1a Format 1a	1-bit HARQ ACK/NACK with/without SR1-bit HARQ ACK / NACK with / without SR

Format 1bFormat 1b	2-bit HARQ ACK/NACK with/without SR2-bit HARQ ACK / NACK with / without SR

Format 2Format 2	CQI (20 coded bits)CQI (20 coded bits)
Format 2 Format 2	CQI and 1- or 2-bit HARQ ACK/NACK (20 bits) for extended CP onlyCQI and 1- or 2-bit HARQ ACK / NACK (20 bits) for extended CP only
Format 2a Format 2a	CQI and 1-bit HARQ ACK/NACK (20+1 coded bits)CQI and 1-bit HARQ ACK / NACK (20 + 1 coded bits)
Format 2b Format 2b	CQI and 2-bit HARQ ACK/NACK (20+2 coded bits)CQI and 2-bit HARQ ACK / NACK (20 + 2 coded bits)

PUCCH format 1 is used for single transmission of SR. In the case of SR transmission alone, an unmodulated waveform is applied, which will be described later in detail.

PUCCH format

1a or 1b is used for transmission of HARQ ACK / NACK. When HARQ ACK / NACK is transmitted alone in any subframe,

PUCCH format

1a or 1b may be used. Alternatively, HARQ ACK / NACK and SR may be transmitted in the same subframe using

PUCCH format

1a or 1b.

PUCCH format 2 is used for transmission of CQI, and

PUCCH format

2a or 2b is used for transmission of CQI and HARQ ACK / NACK.

In the case of an extended CP, PUCCH format 2 may be used for transmission of CQI and HARQ ACK / NACK.

In FIG. 5, N_RB ^ UL indicates the number of resource blocks in the uplink, and 0, 1, ..., N_RB ^ UL -1 means the number of physical resource blocks. Basically, the PUCCH is mapped to both edges of the uplink frequency block. As shown in FIG. 5, the PUCCH format 2 / 2a / 2b is mapped to the PUCCH region indicated by m = 0,1, which means that the resource blocks in which the PUCCH format 2 / 2a / 2b is located at the band-edge are located. It can be expressed as mapped to. In addition, PUCCH format 2 / 2a / 2b and PUCCH format 1 / 1a / 1b may be mixed together in a PUCCH region indicated by m = 2. Next, the PUCCH format 1 / 1a / 1b may be mapped to the PUCCH region represented by m = 3,4,5. The number of PUCCH RBs (N_RB ^ (2)) usable by the PUCCH format 2 / 2a / 2b may be indicated to terminals in a cell by broadcasting signaling.

The PUCCH format 2 / 2a / 2b will be described. PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQI, PMI, RI).

The reporting period of the channel measurement feedback (hereinafter, collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured may be controlled by the base station. Periodic and aperiodic CQI reporting can be supported in the time domain. PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting. In the case of aperiodic reporting, the base station may instruct the terminal to transmit an individual CQI report on a resource scheduled for uplink data transmission.

Of SC-FDMA symbols 0 to 6 of one slot, SC-FDMA symbols 1 and 5 (second and sixth symbols) are used for demodulation reference signal (DMRS) transmission, and CQI in the remaining SC-FDMA symbols. Information can be transmitted. Meanwhile, in the case of an extended CP, one SC-FDMA symbol (SC-FDMA symbol 3) is used for DMRS transmission.

In the PUCCH format 2 / 2a / 2b, modulation by a CAZAC sequence is supported, and a QPSK modulated symbol is multiplied by a length 12 CAZAC sequence. The cyclic shift (CS) of the sequence is changed between symbol and slot. Orthogonal covering is used for DMRS.

Reference signal (DMRS) is carried on two SC-FDMA symbols spaced by three SC-FDMA symbol intervals among seven SC-FDMA symbols included in one slot, and CQI information is carried on the remaining five SC-FDMA symbols. Two RSs are used in one slot to support a high speed terminal. In addition, each terminal is distinguished using a cyclic shift (CS) sequence. The CQI information symbols are modulated and transmitted throughout the SC-FDMA symbol, and the SC-FDMA symbol is composed of one sequence. That is, the terminal modulates and transmits the CQI in each sequence.

The number of symbols that can be transmitted in one TTI is 10, and modulation of CQI information is determined up to QPSK. When QPSK mapping is used for an SC-FDMA symbol, a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe. A frequency domain spread code is used to spread the CQI information in the frequency domain.

As the frequency domain spreading code, a length-12 CAZAC sequence (eg, a ZC sequence) may be used. Each control channel may be distinguished by applying a CAZAC sequence having a different cyclic shift value. IFFT is performed on the frequency domain spread CQI information.

12 different terminals may be orthogonally multiplexed on the same PUCCH RB by means of 12 equally spaced cyclic shifts. The DMRS sequence on SC-FDMA symbol 1 and 5 (on SC-FDMA symbol 3 in extended CP case) in the general CP case is similar to the CQI signal sequence on the frequency domain but no modulation such as CQI information is applied.

PUCCH 채널구조PUCCH Channel Structure

The PUCCH formats 1a and 1b will be described.

In the PUCCH format 1a / 1b, a symbol modulated using a BPSK or QPSK modulation scheme is multiply multiplied by a CAZAC sequence having a length of 12. For example, the result of multiplying modulation symbol d (0) by length CAZAC sequence r (n) (n = 0, 1, 2, ..., N-1) is y (0), y (1). ), y (2), ..., y (N-1). The y (0), ..., y (N-1) symbols may be referred to as a block of symbols. After multiplying the CAZAC sequence by the modulation symbol, block-wise spreading using an orthogonal sequence is applied.

A Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal.

A Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP.

7 exemplarily shows a PUCCH channel structure for HARQ ACK / NACK transmission without CQI.

A reference signal RS is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbols included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.

Meanwhile, in the case of an extended CP, RS may be carried on two consecutive symbols in the middle. The number and position of symbols used for the RS may vary depending on the control channel, and the number and position of symbols used for the ACK / NACK signal associated therewith may also be changed accordingly.

1 bit and 2 bit acknowledgment information (unscrambled state) may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPSK modulation techniques, respectively. The acknowledgment (ACK) may be encoded as '1', and the negative acknowledgment (NACK) may be encoded as '0'.

When transmitting control signals in the allocated band, two-dimensional spreading is applied to increase the multiplexing capacity. That is, frequency domain spreading and time domain spreading are simultaneously applied to increase the number of terminals or control channels that can be multiplexed.

In order to spread the ACK / NACK signal in the frequency domain, a frequency domain sequence is used as the base sequence. As the frequency domain sequence, one of the CAZAC sequences may be a Zadoff-Chu (ZC) sequence. For example, different cyclic shifts (CS) are applied to a ZC sequence, which is a basic sequence, so that multiplexing of different terminals or different control channels may be applied. The number of CS resources supported in SC-FDMA symbols for PUCCH RBs for HARQ ACK / NACK transmission is set by the cell-specific higher-layer signaling parameter.

The frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code. As the orthogonal spreading code, a Walsh-Hadamard sequence or a DFT sequence may be used. For example, the ACK / NACK signal may be spread using orthogonal sequences w0, w1, w2, and w3 of length 4 for four symbols. RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (OC).

A plurality of terminals may be multiplexed using a code division multiplexing (CDM) scheme using the CS resource in the frequency domain and the OC resource in the time domain as described above. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.

For this time domain spreading CDM, the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the multiplexing capacity of the RS is smaller than that of the ACK / NACK information.

For example, in case of a normal CP, ACK / NACK information may be transmitted in four symbols. For the ACK / NACK information, three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.

In the case where three symbols in one slot are used for RS transmission and four symbols are used for ACK / NACK information transmission in a subframe of a general CP, for example, six cyclic shifts (CS) and If three orthogonal cover (OC) resources are available in the time domain, HARQ acknowledgments from a total of 18 different terminals can be multiplexed within one PUCCH RB. If two symbols in one slot are used for RS transmission and four symbols are used for ACK / NACK information transmission in a subframe of an extended CP, for example, six cyclic shifts in the frequency domain ( If two orthogonal cover (OC) resources can be used in the CS) and the time domain, HARQ acknowledgments from a total of 12 different terminals can be multiplexed within one PUCCH RB.

Next, PUCCH format 1 will be described. The scheduling request SR is transmitted in such a manner that the terminal requests or does not request to be scheduled. The SR channel reuses the ACK / NACK channel structure in PUCCH formats 1a / 1b and is configured in an OOK (On-Off Keying) scheme based on the ACK / NACK channel design. Reference signals are not transmitted in the SR channel. Therefore, a sequence of length 7 is used for a general CP, and a sequence of length 6 is used for an extended CP. Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK. That is, for positive SR transmission, the UE transmits HARQ ACK / NACK through resources allocated for SR. In order to transmit a negative SR, the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.

Next, the enhanced-PUCCH (e-PUCCH) format will be described. The e-PUCCH may correspond to PUCCH format 3 of the LTE-A system. Block spreading can be applied to ACK / NACK transmission using PUCCH format 3.

Unlike the conventional PUCCH format 1 series or 2 series, the block spreading scheme modulates control signal transmission using the SC-FDMA scheme. As shown in FIG. 8, a symbol sequence may be spread and transmitted on a time domain using an orthogonal cover code (OCC). By using the OCC, control signals of a plurality of terminals may be multiplexed on the same RB. In the case of the above-described PUCCH format 2, one symbol sequence is transmitted over a time domain and control signals of a plurality of terminals are multiplexed using a cyclic shift (CS) of a CAZAC sequence, whereas a block spread based PUCCH format (for example, In the case of PUCCH format 3), one symbol sequence is transmitted over a frequency domain, and control signals of a plurality of terminals are multiplexed using time-domain spreading using OCC.

FIG. 8 illustrates an example of generating and transmitting five SC-FDMA symbols (ie, data portions) using an OCC having a length = 5 (or SF = 5) in one symbol sequence during one slot. In this case, two RS symbols may be used for one slot.

In the example of FIG. 8, an RS symbol may be generated from a CAZAC sequence to which a specific cyclic shift value is applied, and may be transmitted in a form in which a predetermined OCC is applied (or multiplied) over a plurality of RS symbols. In addition, in the example of FIG. 8, it is assumed that 12 modulation symbols are used for each OFDM symbol (or SC-FDMA symbol), and each modulation symbol is generated by QPSK. Becomes 12x2 = 24 bits. Therefore, the number of bits that can be transmitted in two slots is a total of 48 bits. As described above, when the block spread type PUCCH channel structure is used, control information having an extended size can be transmitted as compared to the PUCCH format 1 series and 2 series.

캐리어병합일반Carrier General

The communication environment considered in the embodiments of the present invention includes all of the multi-carrier support environments. That is, the multicarrier system or carrier aggregation (CA) system used in the present invention is one or more having a bandwidth smaller than the target band when configuring the target broadband to support the broadband A system that aggregates and uses a component carrier (CC).

In the present invention, the multi-carrier means the aggregation of carriers (or carrier aggregation), wherein the aggregation of carriers means not only merging between contiguous carriers but also merging between non-contiguous carriers. In addition, the number of component carriers aggregated between downlink and uplink may be set differently. The case where the number of downlink component carriers (hereinafter referred to as 'DL CC') and the number of uplink component carriers (hereinafter referred to as 'UL CC') is the same is called symmetric aggregation. This is called asymmetric aggregation. Such carrier aggregation may be used interchangeably with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.

Carrier aggregation, in which two or more component carriers are combined, aims to support up to 100 MHz bandwidth in an LTE-A system. When combining one or more carriers having a bandwidth smaller than the target band, the bandwidth of the combining carrier may be limited to the bandwidth used by the existing system to maintain backward compatibility with the existing IMT system. For example, the existing 3GPP LTE system supports {1.4, 3, 5, 10, 15, 20} MHz bandwidth, and the 3GPP LTE-advanced system (i.e., LTE-A) supports the above for compatibility with the existing system. Only bandwidths can be used to support bandwidths greater than 20 MHz. In addition, the carrier aggregation system used in the present invention may support carrier aggregation by defining a new bandwidth regardless of the bandwidth used in the existing system.

The LTE-A system uses the concept of a cell to manage radio resources.

The carrier aggregation environment described above may be referred to as a multiple cell environment. A cell is defined as a combination of a downlink resource (DL CC) and an uplink resource (UL CC), but the uplink resource is not an essential element. Accordingly, the cell may be configured with only downlink resources or with downlink resources and uplink resources. When a specific UE has only one configured serving cell, it may have one DL CC and one UL CC, but when a specific UE has two or more configured serving cells, as many DLs as the number of cells Has a CC and the number of UL CCs may be the same or less.

Alternatively, the DL CC and the UL CC may be configured on the contrary. That is, when a specific UE has a plurality of configured serving cells, a carrier aggregation environment in which a UL CC has more than the number of DL CCs may be supported. That is, carrier aggregation may be understood as merging two or more cells, each having a different carrier frequency (center frequency of a cell). Here, the term 'cell' should be distinguished from the 'cell' as an area covered by a generally used base station.

Cells used in the LTE-A system include a primary cell (PCell: Primary Cell) and a secondary cell (SCell: Secondary Cell). P cell and S cell may be used as a serving cell. In case of the UE that is in the RRC_CONNECTED state but the carrier aggregation is not configured or does not support the carrier aggregation, there is only one serving cell composed of the PCell. On the other hand, in case of a UE in RRC_CONNECTED state and carrier aggregation is configured, one or more serving cells may exist, and the entire serving cell includes a PCell and one or more SCells.

Serving cells (P cell and S cell) may be configured through an RRC parameter. PhysCellId is a cell's physical layer identifier and has an integer value from 0 to 503. SCellIndex is a short identifier used to identify an SCell and has an integer value from 1 to 7. ServCellIndex is a short identifier used to identify a serving cell (P cell or S cell) and has an integer value from 0 to 7. A value of 0 is applied to the Pcell, and SCellIndex is pre-assigned to apply to the Scell. That is, a cell having the smallest cell ID (or cell index) in ServCellIndex becomes a P cell.

P cell refers to a cell operating on a primary frequency (or primary CC). The UE may be used to perform an initial connection establishment process or to perform a connection re-establishment process, and may also refer to a cell indicated in a handover process. In addition, the P cell refers to a cell serving as a center of control-related communication among serving cells configured in a carrier aggregation environment. That is, the terminal may receive and transmit a PUCCH only in its own Pcell, and may use only the Pcell to acquire system information or change a monitoring procedure. E-UTRAN (Evolved Universal Terrestrial Radio Access) changes only the Pcell for the handover procedure by using an RRC ConnectionReconfigutaion message of a higher layer including mobility control information to a UE supporting a carrier aggregation environment. It may be.

The S cell may refer to a cell operating on a secondary frequency (or, secondary CC). Only one PCell may be allocated to a specific UE, and one or more SCells may be allocated. The SCell is configurable after the RRC connection is established and can be used to provide additional radio resources. PUCCH does not exist in the remaining cells excluding the P cell, that is, the S cell, among the serving cells configured in the carrier aggregation environment. When the E-UTRAN adds the SCell to the UE supporting the carrier aggregation environment, the E-UTRAN may provide all system information related to the operation of the related cell in the RRC_CONNECTED state through a dedicated signal. The change of the system information may be controlled by the release and addition of the related SCell, and at this time, an RRC connection reconfigutaion message of a higher layer may be used. The E-UTRAN may perform dedicated signaling having different parameters for each terminal, rather than broadcasting in the related SCell.

After the initial security activation process begins, the E-UTRAN may configure a network including one or more Scells in addition to the Pcells initially configured in the connection establishment process. In the carrier aggregation environment, the Pcell and the SCell may operate as respective component carriers. In the following embodiment, the primary component carrier (PCC) may be used in the same sense as the PCell, and the secondary component carrier (SCC) may be used in the same sense as the SCell.

9A shows a single carrier structure used in an LTE system. Component carriers include a DL CC and an UL CC. One component carrier may have a frequency range of 20 MHz.

9B shows a carrier aggregation structure used in the LTE_A system. In the case of FIG. 9B, three component carriers having a frequency size of 20 MHz are combined. Although there are three DL CCs and three UL CCs, the number of DL CCs and UL CCs is not limited. In case of carrier aggregation, the UE may simultaneously monitor three CCs, receive downlink signals / data, and transmit uplink signals / data.

If N DL CCs are managed in a specific cell, the network may allocate M (M ≦ N) DL CCs to the UE. In this case, the UE may monitor only M limited DL CCs and receive a DL signal. In addition, the network may assign L (L ≦ M ≦ N) DL CCs to allocate a main DL CC to the UE, in which case the UE must monitor the L DL CCs. This method can be equally applied to uplink transmission.

The linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by a higher layer message or system information such as an RRC message. For example, a combination of DL resources and UL resources may be configured by a linkage defined by SIB2 (System Information Block Type2). Specifically, the linkage may mean a mapping relationship between a DL CC on which a PDCCH carrying a UL grant is transmitted and a UL CC using the UL grant, and a DL CC (or UL CC) and HARQ ACK on which data for HARQ is transmitted. It may mean a mapping relationship between UL CCs (or DL CCs) through which a / NACK signal is transmitted.

크로스캐리어스케줄링(Cross Carrier Scheduling)Cross Carrier Scheduling

In a carrier aggregation system, there are two types of a self-scheduling method and a cross carrier scheduling method in terms of scheduling for a carrier (or carrier) or a serving cell. Cross carrier scheduling may be referred to as Cross Component Carrier Scheduling or Cross Cell Scheduling.

In cross-carrier scheduling, a DL CC in which a PDCCH (DL Grant) and a PDSCH are transmitted to different DL CCs, or a UL CC in which a PUSCH transmitted according to a PDCCH (UL Grant) transmitted in a DL CC is linked to a DL CC having received an UL grant This means that it is transmitted through other UL CC.

Whether to perform cross-carrier scheduling may be activated or deactivated UE-specifically and may be known for each UE semi-statically through higher layer signaling (eg, RRC signaling).

When cross-carrier scheduling is activated, a carrier indicator field (CIF: Carrier Indicator Field) indicating a PDSCH / PUSCH indicated by the corresponding PDCCH is transmitted to the PDCCH. For example, the PDCCH may allocate PDSCH resource or PUSCH resource to one of a plurality of component carriers using CIF. That is, when the PDCCH on the DL CC allocates PDSCH or PUSCH resources to one of the multi-aggregated DL / UL CC, CIF is set. In this case, the DCI format of LTE-A Release-8 may be extended according to CIF. In this case, the set CIF may be fixed as a 3 bit field or the position of the set CIF may be fixed regardless of the DCI format size. In addition, the PDCCH structure (same coding and resource mapping based on the same CCE) of LTE-A Release-8 may be reused.

On the other hand, if the PDCCH on the DL CC allocates PDSCH resources on the same DL CC or PUSCH resources on a single linked UL CC, CIF is not configured. In this case, the same PDCCH structure (same coding and resource mapping based on the same CCE) and DCI format as the LTE-A Release-8 may be used.

When cross carrier scheduling is possible, the UE needs to monitor the PDCCHs for the plurality of DCIs in the control region of the monitoring CC according to the transmission mode and / or bandwidth for each CC. Therefore, it is necessary to configure the search space and PDCCH monitoring that can support this.

In the carrier aggregation system, the terminal DL CC set represents a set of DL CCs scheduled for the terminal to receive a PDSCH, and the terminal UL CC set represents a set of UL CCs scheduled for the terminal to transmit a PUSCH. In addition, the PDCCH monitoring set represents a set of at least one DL CC that performs PDCCH monitoring. The PDCCH monitoring set may be the same as the terminal DL CC set or may be a subset of the terminal DL CC set. The PDCCH monitoring set may include at least one of DL CCs in the terminal DL CC set. Alternatively, the PDCCH monitoring set may be defined separately regardless of the UE DL CC set. The DL CC included in the PDCCH monitoring set may be configured to always enable self-scheduling for the linked UL CC. The UE DL CC set, the UE UL CC set, and the PDCCH monitoring set may be configured UE-specifically, UE group-specifically, or cell-specifically.

When cross-carrier scheduling is deactivated, it means that the PDCCH monitoring set is always the same as the UE DL CC set. In this case, an indication such as separate signaling for the PDCCH monitoring set is not necessary. However, when cross-carrier scheduling is activated, it is preferable that a PDCCH monitoring set is defined in the terminal DL CC set. That is, in order to schedule PDSCH or PUSCH for the UE, the base station transmits the PDCCH through only the PDCCH monitoring set.

Referring to FIG. 10, three DL CCs are combined in a DL subframe for an LTE-A terminal, and DL CC 'A' represents a case in which a PDCCH monitoring DL CC is configured. If CIF is not used, each DL CC may transmit a PDCCH for scheduling its PDSCH without CIF. On the other hand, when the CIF is used through higher layer signaling, only one DL CC 'A' may transmit a PDCCH for scheduling its PDSCH or PDSCH of another CC using the CIF. At this time, DL CCs 'B' and 'C' that are not configured as PDCCH monitoring DL CCs do not transmit the PDCCH.

일반적인 Normally ACKACK /Of NACKNACK 멀티플렉싱Multiplexing 방법 Way

In a situation where the UE needs to simultaneously transmit a plurality of ACK / NACKs corresponding to a plurality of data units received from the eNB, in order to maintain a single-frequency characteristic of the ACK / NACK signal and reduce the ACK / NACK transmission power, the PUCCH An ACK / NACK multiplexing method based on resource selection may be considered.

With ACK / NACK multiplexing, the contents of ACK / NACK responses for multiple data units are identified by the combination of the PUCCH resource and the resource of QPSK modulation symbols used for the actual ACK / NACK transmission.

For example, if one PUCCH resource transmits 4 bits and 4 data units can be transmitted at maximum, the ACK / NACK result may be identified at the eNB as shown in Table 3 below.

In Table 3, HARQ-ACK (i) represents the ACK / NACK result for the i-th data unit (data unit). In Table 3, DTX (Discontinuous Transmission) means that there is no data unit to be transmitted for the corresponding HARQ-ACK (i) or the terminal does not detect a data unit corresponding to HARQ-ACK (i).

According to Table 3, up to four PUCCH resources (

,

, And

B (0) and b (1) are two bits transmitted using the selected PUCCH.

For example, if the terminal successfully receives all four data units, the terminal

Transmits 2 bits (1,1) using.

If the terminal fails to decode in the first and third data units and decodes in the second and fourth data units, the terminal

Transmit bits (1,0) using.

In ACK / NACK channel selection, if there is at least one ACK, the NACK and the DTX are coupled. This is because a combination of reserved PUCCH resources and QPSK symbols cannot indicate all ACK / NACK states. However, in the absence of an ACK, the DTX decouples from the NACK.

In this case, the PUCCH resource linked to the data unit corresponding to one explicit NACK may also be reserved for transmitting signals of multiple ACK / NACKs.

반지속적 스케줄링(Semi-Persistent Scheduling)을 위한 For Semi-Persistent Scheduling PDCCHPDCCH 확인(validation) Validation

Semi-Persistent Scheduling (SPS) is a scheduling scheme in which resources are allocated to a specific UE so as to be continuously maintained for a specific time period.

When a certain amount of data is transmitted for a certain time, such as Voice over Internet Protocol (VoIP), it is not necessary to transmit control information every data transmission interval for resource allocation, so the waste of control information can be reduced by using the SPS method. . In the so-called semi-persistent scheduling (SPS) method, a time resource region in which resources can be allocated to a terminal is first allocated.

In this case, in the ring-based allocation method, a time resource region allocated to a specific terminal may be set to have periodicity. Then, the allocation of time-frequency resources is completed by allocating frequency resource regions as necessary. This allocation of frequency resource regions may be referred to as so-called activation. Using the ring-based allocation method, since the resource allocation is maintained for a period of time by one signaling, there is no need to repeatedly allocate resources, thereby reducing signaling overhead.

Thereafter, when resource allocation for the terminal is no longer needed, signaling for releasing frequency resource allocation may be transmitted from the base station to the terminal. This release of the frequency resource region may be referred to as deactivation.

In the current LTE, for the SPS for uplink and / or downlink, the UE first informs the UE of which subframes to perform SPS transmission / reception through RRC (Radio Resource Control) signaling. That is, a time resource is first designated among time-frequency resources allocated for SPS through RRC signaling. In order to inform the subframe that can be used, for example, the period and offset of the subframe can be informed. However, since the terminal receives only the time resource region through RRC signaling, even if it receives the RRC signaling, the UE does not immediately transmit and receive by the SPS, and completes the time-frequency resource allocation by allocating the frequency resource region as necessary. . This allocation of the frequency resource region may be referred to as activation, and release of the frequency resource region may be referred to as deactivation.

Therefore, after receiving the PDCCH indicating activation, the UE allocates a frequency resource according to the RB allocation information included in the received PDCCH, and modulates and codes according to MCS (Modulation and Coding Scheme) information. Rate) is applied to start transmission and reception according to the subframe period and offset allocated through the RRC signaling.

Then, the terminal stops transmission and reception when receiving the PDCCH indicating the deactivation from the base station. If a PDCCH indicating activation or reactivation is received after stopping transmission and reception, transmission and reception are resumed again with a subframe period and offset allocated by RRC signaling using an RB allocation or an MCS designated by the PDCCH. That is, the allocation of time resources is performed through RRC signaling, but the transmission and reception of the actual signal may be performed after receiving the PDCCH indicating the activation and reactivation of the SPS, and the interruption of the transmission and reception of the signal is indicated by the PDCCH indicating the deactivation of the SPS. After receiving it.

The UE may check the PDCCH including the SPS indication when all of the following conditions are satisfied. Firstly, the CRC parity bit added for the PDCCH payload must be scrambled with the SPS C-RNTI, and secondly, the New Data Indicator (NDI) field must be set to zero. Here, in the case of DCI formats 2, 2A, 2B, and 2C, the new data indicator field indicates one of active transport blocks.

When each field used for the DCI format is set according to Tables 4 and 5 below, the verification is completed. When this confirmation is completed, the terminal recognizes that the received DCI information is a valid SPS activation or deactivation (or release). On the other hand, if the verification is not completed, the UE recognizes that the non-matching CRC is included in the received DCI format.

Table 4 shows fields for PDCCH confirmation indicating SPS activation.

Table 5 shows a field for PDCCH confirmation indicating SPS deactivation (or release).

When the DCI format indicates SPS downlink scheduling activation, the TPC command value for the PUCCH field may be used as an index indicating four PUCCH resource values set by a higher layer.

PUCCHPUCCH piggybacking in piggybacking in RelRel -8 -8 LTELTE

In the 3GPP LTE system (= E-UTRA, Rel. 8), in the case of UL, the peak-to-average power ratio (PAPR) characteristic or CM (PAPR) affecting the performance of the power amplifier for efficient use of the power amplifier of the terminal. Cubic Metric is designed to maintain good single carrier transmission. That is, in the case of PUSCH transmission in the existing LTE system, the single carrier characteristics are maintained through DFT-precoding for data to be transmitted, and in the case of PUCCH transmission, information is transmitted on a sequence having a single carrier characteristic to transmit single carrier characteristics. I can keep it. However, when the DFT-precoding data is discontinuously allocated on the frequency axis or when PUSCH and PUCCH are simultaneously transmitted, this single carrier characteristic is broken. Accordingly, as shown in FIG. 11, when there is a PUSCH transmission in the same subframe as the PUCCH transmission, uplink control information (UCI) information to be transmitted in the PUCCH is transmitted together with the data through the PUSCH in order to maintain a single carrier characteristic.

As described above, since a conventional LTE terminal cannot simultaneously transmit a PUCCH and a PUSCH, a method of multiplexing uplink control information (UCI) (CQI / PMI, HARQ-ACK, RI, etc.) in a PUSCH region in a subframe in which a PUSCH is transmitted use.

For example, in case of transmitting Channel Quality Indicator (CQI) and / or Precoding Matrix Indicator (PMI) in a subframe allocated to transmit PUSCH, UL-SCH data and CQI / PMI are multiplexed before DFT-spreading and control information. You can send data together. In this case, UL-SCH data performs rate-matching in consideration of CQI / PMI resources. In addition, control information such as HARQ ACK, RI, and the like is multiplexed in the PUSCH region by puncturing UL-SCH data.

Hereinafter, a signal processing procedure of an uplink shared channel (hereinafter, referred to as "UL-SCH") may be applied to one or more transport channels or control information types.

Referring to FIG. 12, the UL-SCH transmits data to a coding unit in the form of a transport block (TB) once every transmission time interval (TTI).

Bit of transport block received from higher layer

CRC parity bit on

Attach (S120). In this case, A is the size of the transport block, L is the number of parity bits. Input bits with CRC attached

Same as In this case, B represents the number of bits of the transport block including the CRC.

Is segmented into a plurality of code blocks (CBs) according to the TB size, and a CRC is attached to the divided CBs (S121). Bits after code block split and CRC attached

Same as Where r is the number of code blocks (r = 0, ..., C-1) and K _r is the number of bits according to code block r. In addition, C represents the total number of code blocks.

Subsequently, channel coding is performed (S122). The output bit after channel coding is

Same as In this case, i is an encoded stream index and may have a value of 0, 1, or 2.

Denotes the number of bits of the i th coded stream for the code block r. r is a code block number (r = 0, ..., C-1), and C represents the total number of code blocks. Each code block may be encoded by turbo coding, respectively.

Next, rate matching is performed (S123). Bits after rate matching

Same as In this case, r is the number of code blocks (r = 0, ..., C-1), and C represents the total number of code blocks.

Denotes the number of rate matched bits of the r th code block.

Subsequently, concatenation between code blocks is performed again (S124). The bits after the concatenation of the code blocks are performed

Same as In this case, G represents the total number of encoded bits for transmission, and when the control information is multiplexed with the UL-SCH transmission, the number of bits used for transmission of the control information is not included.

On the other hand, when control information is transmitted in the PUSCH, channel coding is independently performed on the control information CQI / PMI, RI, and ACK / NACK (S126, S127, and S128). Since different coded symbols are allocated for transmission of each control information, each control information has a different coding rate.

In the time division duplex (TDD), two modes of ACK / NACK feedback mode and ACK / NACK bundling and ACK / NACK multiplexing are supported by higher layer configuration. For ACK / NACK bundling, the ACK / NACK information bit is composed of 1 bit or 2 bits, and for ACK / NACK multiplexing, the ACK / NACK information bit is composed of 1 to 4 bits.

After the step of combining between code blocks in step S134, the coded bits of the UL-SCH data

And coded bits of CQI / PMI

Multiplexing is performed (S125). The multiplexed result of the data and CQI / PMI

Same as At this time,

Is

Represents a column vector having a length.

ego,

to be.

Is the number of layers to which the UL-SCH transport block is mapped, and H is the transport block to which the transport block is mapped.

It indicates the total number of coded bits allocated for UL-SCH data and CQI / PMI information in three transport layers.

Subsequently, the multiplexed data, CQI / PMI, separate channel-coded RI, and ACK / NACK are channel interleaved to generate an output signal (S129).

Since data is transmitted over a wireless channel in a wireless communication system, the signal may be distorted during transmission. In order to correctly receive the distorted signal at the receiving end, the distortion of the received signal must be corrected using the channel information. In order to detect channel information, a signal transmission method known to both a transmitting side and a receiving side and a method of detecting channel information using a distorted degree when a signal is transmitted through a channel are mainly used. The above-mentioned signal is called a pilot signal or a reference signal RS.

When transmitting and receiving data using multiple input / output antennas, a channel state between a transmitting antenna and a receiving antenna must be detected in order to receive a signal accurately. Therefore, each transmit antenna must have a separate reference signal.

The downlink reference signal includes a common reference signal (CRS: common RS) shared by all terminals in one cell and a dedicated reference signal (DRS) dedicated for a specific terminal. Such reference signals may be used to provide information for demodulation and channel measurement.

The receiving side (i.e., the terminal) measures the channel state from the CRS and transmits an indicator related to the channel quality such as the channel quality indicator (CQI), precoding matrix index (PMI) and / or rank indicator (RI). Feedback to the base station). CRS is also referred to as cell-specific RS. On the other hand, a reference signal related to feedback of channel state information (CSI) may be defined as CSI-RS.

The DRS may be transmitted through resource elements when data demodulation on the PDSCH is needed. The UE may receive the presence or absence of a DRS through a higher layer and is valid only when a corresponding PDSCH is mapped. The DRS may be referred to as a UE-specific RS or a demodulation RS (DMRS).

Referring to FIG. 13, a downlink resource block pair may be represented by 12 subcarriers in one subframe × frequency domain in a time domain in which a reference signal is mapped. That is, one resource block pair on the time axis (x-axis) has a length of 14 OFDM symbols in case of normal cyclic prefix (normal CP) (FIG. 13A), and extended cyclic prefix (extended CP) Prefix) has a length of 12 OFDM symbols (FIG. 13B). The resource elements (REs) described as '0', '1', '2' and '3' in the resource block grid are determined by the CRS of the antenna port indexes '0', '1', '2' and '3', respectively. The location of the resource element described as 'D' means the location of the DRS.

Hereinafter, the CRS will be described in more detail. The CRS is used to estimate a channel of a physical antenna and is distributed in the entire frequency band as a reference signal that can be commonly received to all terminals located in a cell. In addition, the CRS may be used for channel quality information (CSI) and data demodulation.

CRS is defined in various formats depending on the antenna arrangement at the transmitting side (base station). The 3GPP LTE system (eg, Release-8) supports various antenna arrangements, and the downlink signal transmitting side has three types of antenna arrangements such as three single transmit antennas, two transmit antennas, and four transmit antennas. . If the base station uses a single transmit antenna, the reference signal for the single antenna port is arranged. When the base station uses two transmit antennas, the reference signals for the two transmit antenna ports are arranged using time division multiplexing (TDM) and / or FDM frequency division multiplexing (FDM) scheme. That is, the reference signals for the two antenna ports are assigned different time resources and / or different frequency resources so that each is distinguished.

In addition, when the base station uses four transmit antennas, reference signals for the four transmit antenna ports are arranged using the TDM and / or FDM scheme. The channel information measured by the receiving side (terminal) of the downlink signal may be transmitted by a single transmit antenna, transmit diversity, closed-loop spatial multiplexing, open-loop spatial multiplexing, or It may be used to demodulate data transmitted using a transmission scheme such as a multi-user MIMO.

When a multiple input / output antenna is supported, when a reference signal is transmitted from a specific antenna port, the reference signal is transmitted to a location of resource elements specified according to a pattern of the reference signal, and the location of resource elements specified for another antenna port. Is not sent to. That is, reference signals between different antennas do not overlap each other.

The rules for mapping CRSs to resource blocks are defined as follows.

In Equation 1, k and l represent a subcarrier index and a symbol index, respectively, and p represents an antenna port.

Denotes the number of OFDM symbols in one downlink slot,

Represents the number of radio resources allocated to the downlink.

Represents the slot index,

Represents a cell ID. mod stands for modulo operation. The position of the reference signal is in the frequency domain

It depends on the value.

Since is dependent on the cell ID (ie, the physical layer cell ID), the position of the reference signal has various frequency shift values according to the cell.

More specifically, the position of the CRS may be shifted in the frequency domain according to the cell in order to improve channel estimation performance through the CRS. For example, when reference signals are located at intervals of three subcarriers, reference signals in one cell are allocated to the 3k th subcarrier, and reference signals in another cell are allocated to the 3k + 1 th subcarrier. In terms of one antenna port, the reference signals are arranged at six resource element intervals in the frequency domain, and are separated at three resource element intervals from the reference signal allocated to another antenna port.

In the time domain, reference signals are arranged at constant intervals starting from symbol index 0 of each slot. The time interval is defined differently depending on the cyclic prefix length. In the case of the normal cyclic prefix, the reference signal is located at

symbol indexes

0 and 4 of the slot, and in the case of the extended cyclic prefix, the reference signal is located at

symbol indexes

0 and 3 of the slot. The reference signal for the antenna port having the maximum value of two antenna ports is defined in one OFDM symbol. Thus, for four transmit antenna transmissions, the reference signals for reference

signal antenna ports

0 and 1 are located at symbol indices 0 and 4 (

symbol indices

0 and 3 for extended cyclic prefix) of slots, The reference signal for is located at symbol index 1 of the slot. The positions in the frequency domain of the reference signal for

antenna ports

2 and 3 are swapped with each other in the second slot.

In more detail with respect to DRS, DRS is used to demodulate data. Precoding weights used for a specific terminal in multiple I / O antenna transmission are used without change to estimate the corresponding channel by combining with the transmission channel transmitted from each transmission antenna when the terminal receives the reference signal.

The 3GPP LTE system (eg, Release-8) supports up to four transmit antennas and a DRS for rank 1 beamforming is defined. The DRS for rank 1 beamforming also indicates a reference signal for antenna port index 5.

The rules for mapping DRS to resource blocks are defined as follows. Equation 2 shows a case of a general cyclic transpose, and Equation 3 shows a case of an extended cyclic transpose.

In

Equations

2 and 3, k and l represent subcarrier indices and symbol indices, respectively, and p represents an antenna port.

Denotes the resource block size in the frequency domain and is expressed as the number of subcarriers.

Represents the number of physical resource blocks. N_RB ^ PDSCH represents a frequency band of a resource block for PDSCH transmission.

Represents the slot index,

It depends on the value.

사운딩Sounding 참조 신호( Reference signal ( SRSSRS : Sounding Reference Signal): Sounding Reference Signal)

SRS is mainly used for measuring channel quality in order to perform frequency-selective scheduling of uplink and is not related to transmission of uplink data and / or control information. However, the present invention is not limited thereto, and the SRS may be used for various other purposes for improving power control or supporting various start-up functions of terminals which are not recently scheduled. Examples of start-up functions include initial modulation and coding scheme (MCS), initial power control for data transmission, timing advance, and frequency semi-selective scheduling. May be included. In this case, frequency semi-selective scheduling refers to scheduling in which frequency resources are selectively allocated to the first slot of a subframe, and pseudo-randomly jumps to another frequency in the second slot to allocate frequency resources.

In addition, the SRS may be used to measure downlink channel quality under the assumption that the radio channel is reciprocal between uplink and downlink. This assumption is particularly valid in time division duplex (TDD) systems where uplink and downlink share the same frequency spectrum and are separated in the time domain.

Subframes of the SRS transmitted by any terminal in the cell may be represented by a cell-specific broadcast signal. The 4-bit cell-specific 'srsSubframeConfiguration' parameter indicates an array of 15 possible subframes through which the SRS can be transmitted over each radio frame. Such arrangements provide flexibility for the adjustment of the SRS overhead in accordance with a deployment scenario.

The sixteenth arrangement of these switches completely switches off the SRS in the cell, which is mainly suitable for a serving cell serving high-speed terminals.

Referring to FIG. 14, the SRS is always transmitted on the last SC-FDMA symbol on the arranged subframe. Thus, the SRS and DMRS are located in different SC-FDMA symbols.

PUSCH data transmissions are not allowed in certain SC-FDMA symbols for SRS transmissions. As a result, the sounding overhead is equal to the highest sounding overhead, even if all subframes contain SRS symbols. It does not exceed about 7%.

Each SRS symbol is generated by a base sequence (random sequence or a set of sequences based on Zadoff-Ch (ZC)) for a given time unit and frequency band, and all terminals in the same cell use the same base sequence. In this case, SRS transmissions from a plurality of terminals in the same cell at the same frequency band and at the same time are orthogonal to each other by different cyclic shifts of the basic sequence to distinguish them from each other.

SRS sequences from different cells may be distinguished by assigning different base sequences to each cell, but orthogonality between different base sequences is not guaranteed.

COMP(Coordinated Multi-Point Transmission and Reception)Coordinated Multi-Point Transmission and Reception (COM)

In line with the demand of LTE-advanced, CoMP transmission has been proposed to improve the performance of the system. CoMP is also called co-MIMO, collaborative MIMO, network MIMO. CoMP is expected to improve the performance of the terminal located at the cell boundary, and improve the efficiency (throughput) of the average cell (sector).

In general, inter-cell interference reduces performance and average cell (sector) efficiency of a terminal located at a cell boundary in a multi-cell environment having a frequency reuse index of 1. In order to mitigate inter-cell interference, in the LTE system, a simple passive method such as fractional frequency reuse (FFR) is employed in an LTE system so that a terminal located at a cell boundary has an appropriate performance efficiency in an interference-limited environment. Applied. However, instead of reducing the use of frequency resources per cell, a method of reusing inter-cell interference or mitigating inter-cell interference as a desired signal that the terminal should receive is more advantageous. CoMP transmission scheme may be applied to achieve the above object.

CoMP schemes that can be applied to the downlink can be classified into JP (Joint Processing) scheme and CS / CB (Coordinated Scheduling / Beamforming) scheme.

In the JP scheme, data can be used at each point (base station) in CoMP units. CoMP unit means a set of base stations used in the CoMP scheme. The JP method may be further classified into a joint transmission method and a dynamic cell selection method.

The associated transmission scheme refers to a scheme in which a signal is simultaneously transmitted through a PDSCH from a plurality of points, which are all or part of a CoMP unit. That is, data transmitted to a single terminal may be simultaneously transmitted from a plurality of transmission points. Through such a cooperative transmission scheme, the quality of a signal transmitted to a terminal can be increased regardless of whether it is coherently or non-coherently, and can actively remove interference with another terminal. .

The dynamic cell selection method refers to a method in which a signal is transmitted through a PDSCH from a single point in a CoMP unit. That is, data transmitted to a single terminal at a specific time is transmitted from a single point, and data is not transmitted to the terminal at another point in the CoMP unit. The point for transmitting data to the terminal may be dynamically selected.

According to the CS / CB scheme, the CoMP unit performs beamforming in cooperation for data transmission to a single terminal. That is, although only the serving cell transmits data to the terminal, user scheduling / beamforming may be determined through cooperation between a plurality of cells in a CoMP unit.

In the case of uplink, CoMP reception means receiving a signal transmitted by cooperation between a plurality of geographically separated points. CoMP schemes applicable to uplink may be classified into a joint reception (JR) scheme and a coordinated scheduling / beamforming (CS / CB) scheme.

The JR method refers to a method in which a plurality of points, which are all or part of CoMP units, receive a signal transmitted through a PDSCH. The CS / CB scheme receives a signal transmitted through the PDSCH only at a single point, but user scheduling / beamforming may be determined through cooperation between a plurality of cells in a CoMP unit.

Cross-CC scheduling and E-Cross-CC scheduling and E- PDCCHPDCCH scheduling scheduling

In the existing 3GPP LTE Rel-10 system, when defining a cross-CC scheduling operation in an aggregation situation for multiple CCs (Component Carrier = (serving) cell), one CC (ie scheduled CC) is a specific CC (ie scheduling) In order to receive DL / UL scheduling only from the CC) (that is, to receive the DL / UL grant PDCCH for the scheduled CC), it may be set in advance.

The scheduling CC can basically perform DL / UL scheduling for itself.

In other words, all SSs for a PDCCH for scheduling a scheduling / scheduled CC in the cross-CC scheduling relationship may exist in a control channel region of a scheduling CC.

Meanwhile, in an LTE system, FDD DL carriers or TDD DL subframes use the first n OFDM symbols of a subframe for transmission of PDCCH, PHICH, PCFICH, etc., which are physical channels for transmitting various control information, and the remaining OFDM symbols for PDSCH transmission. use.

In this case, the number of symbols used for transmission of control channels in each subframe is transmitted to the terminal dynamically through a physical channel such as PCFICH or semi-statically through RRC signaling.

In this case, the n value may be set from 1 symbol up to 4 symbols according to subframe characteristics and system characteristics (FDD / TDD, system bandwidth, etc.).

On the other hand, PDCCH, which is a physical channel for transmitting DL / UL scheduling and various control information in the existing LTE system, has a limitation such as being transmitted through limited OFDM symbols.

Therefore, instead of a control channel transmitted through an OFDM symbol separated from the PDSCH, such as a PDCCH, an enhanced PDCCH (i.e. E-PDCCH) that is more freely multiplexed using a PDSCH and an FDM / TDM scheme may be introduced.

Here, legacy PDCCH may be represented by L-PDCCH.

NB(Narrow Band)-NB (Narrow Band)- LTELTE 시스템 일반 System general

Hereinafter, the NB-LTE (or NB-IoT) system will be described.

The uplink of NB-LTE is based on SC-FDMA, which is a special case of SC-FDMA and can flexibly allocate bandwidth of a terminal including single tone transmission.

One important aspect for uplink SC-FDMA is to match time for multiple terminals co-scheduled so that the arrival time difference at the base station is within a cyclic prefix (CP).

Ideally, uplink 15 kHz sub-carrier spacing should be used in NB-LTE, but time-accuracy that can be achieved when detecting PRACH from terminals in very poor coverage conditions should be considered. do.

Therefore, the CP duration needs to be increased.

One way to achieve the above objective is to divide the 15 kHz subcarrier spacing by 6 to reduce the subcarrier spacing for the NB-LTE M-PUSCH to 2.5 kHz.

Another motivation to reduce subcarrier spacing is to allow high levels of user multiplexing.

For example, one user is basically assigned to one subcarrier.

This is more effective for terminals in very limited coverage conditions, such as those where system capacity increases due to multiple terminals using the maximum TX power at the same time, while those that do not benefit from being allocated high bandwidth. .

SC-FDMA is used for transmission of multiple tones to support higher data rates with additional PAPR reduction techniques.

The uplink NB-LTE includes three basic channels including M-PRACH, M-PUCCH and M-PUSCH.

In the design of M-PUCCH, at least three alternatives are discussed below.

One tone at each edge of the system bandwidth

UL control information transmission on M-PRACH or M-PUSCH

Not having a dedicated UL control channel

시간 영역 Time domain 프래임Frame 구조(Time-domain frame and structure) Time-domain frame and structure

In uplink of NB-LTE having a 2.5 kHz subcarrier spacing, a radio frame and a subframe are defined as 60 ms and 6 ms, respectively.

As in the downlink of the NB-LTE, the M-frame and the M-subframe are identically defined in the uplink of the NB-LTE, respectively.

16 illustrates how uplink numerology is stretched in the time domain.

The NB-LTE carrier contains six PRBs in the frequency domain. Each NB-LTE PRB includes 12 subcarriers.

The uplink frame structure based on 2.5 kHz subcarrier spacing is shown in FIG. 17.

16 shows an example of uplink numerology unfolding in the time domain when the subcarrier spacing is reduced from 15 kHz to 2.5 kHz.

NB-NB- LTELTE 시스템 동작 System behavior 모드mode

Specifically, FIG. 18A shows an In-band system, FIG. 18B shows a Guard-band system, and FIG. 18C shows a Stand-alone system.

In-band system is in in-band mode, Guard-band system is in guard-band mode, stand-alone system May be expressed in a stand-alone mode.

The in-band system of FIG. 18A refers to a system or mode using a specific 1 RB in a legacy LTE band for NB-LTE (or LTE-NB), and may be operated by allocating some resource blocks of an LTE system carrier. .

The guardband system of FIG. 18b refers to a system or mode using NB-LTE in a space reserved for a guard band of a legacy LTE band, and allocates a guard-band of an LTE carrier that is not used as an RB in an LTE system. Can be operated.

The legacy LTE band has a guardband of at least 100 Khz at the end of each LTE band.

To use 200Khz, two non-contiguous guardbands can be used.

In-band system and Guard-band system represents a structure in which the NB-LTE coexist in the legacy LTE band.

In contrast, the standalone system of FIG. 18c refers to a system or mode configured independently from the legacy LTE band, and may be operated by separately assigning a frequency band (later reassigned GSM carrier) used in GERAN.

상향링크 프로세싱 체인(Uplink processing chain ( UplinkUplink processing chain) processing chain)

In NB LTE systems, single tone transmission is used for the M-PUSCH (or NPUSCH) to minimize PAPR, resulting in improved coverage.

A detailed procedure of M-PUSCH processing will be described with reference to FIG. 19.

CRC generation of M-PUSCH uses the same polynomial as polynomial for generating CRC of M-PDSCH.

Channel coding of the M-PUSCH in the NB LTE system is based on an LTE turbo code encoder as shown in FIG. 20.

Interleaving and rate matching are the same as the method of M-PDSCH.

The encoded bits after rate matching are scrambled with a scrambling mask generated according to the RNTI associated with the M-M-PUSCH transmission.

The scrambled codeword is modulated with BPSK or QPSK according to Table 6 below.

Table 6 shows an example of BPSK modulation mapping.

The modulated symbols are grouped into subcarriers assigned to the M-PUSCH.

In the case of single tone transmission, the transform precoding block of FIG. 19 is omitted, and the group of MF tones is indicated by the base station. MF can be 1, 2, 4, or 8.

If only one tone is indicated from the base station (ie MF = 1), the indicated one tone is used for M-PUSCH transmission.

Otherwise, if multiple tones are indicated from the base station, each set of log2MF + log2MQ bits is determined through a combination of modulation symbols and tones transmitted between the MF tones.

Here, MQ corresponds to the modulation order, and has 2 for BPSK and 4 for QPSK.

For SC-FDMA transmissions with multiple consecutive subcarriers in one cluster, the transform precoding block of FIG. 19 is applied to each group to obtain so-called frequency-domain symbols (known as SC-FDMA).

In addition, to further lower the PAPR for BPSK / QPSK, additional potential PAPR reduction techniques can be applied.

One example of PAPR reduction techniques is to apply an additional precoding filter in the MxL dimension (M> L) to the filter of LxL DFT precoding.

Thereafter, the l-th baseband time-continuous signal is generated based on frequency-domain symbols as shown in Equation 4 below.

Of equation (4)

For M, M denotes the number of subcarriers allocated to M-PUSCH,

,

Is,

Is the l symbol of

Represents a frequency-domain symbol of the subcarrier corresponding to.

Table 7 below is used

This table shows the values of.

For a special case of M = 1, the l-th baseband time-continuous signal is generated based on frequency-domain symbols as shown in Equation 5 below.

Table 7 is a table showing an example of an uplink CP length.

In

Equations

4 and 5 above

Denotes a subcarrier spacing,

Denotes a sampling time.

Hereinafter, various methods for supporting single tone transmission in the NB-IoT (or NB-LTE) system proposed herein will be described through embodiments described below.

The NB-IoT system is a system for supporting low cost, low complexity terminals using narrowband (NB).

Here, the narrow band may refer to 1 Resource Block (RB) of the LTE (-A) system and may mean a band of 200 kHz or less. In one example, the narrow band may be defined as 180 kHz.

The subcarrier spacing in the narrow band may be 15 kHz or 3.75 kHz, and the subcarrier spacing may be the same or different in the downlink and the uplink.

For example, in the NB-IoT system, the downlink subcarrier spacing may be 15 kHz, and the uplink subcarrier spacing may be 15 kHz and 3.75 kHz.

Since the UE (s) belonging to the NB-IoT system (or operating in the NB-IoT system) are required to have low Peak-to-Average Power Ratio (PAPR) performance, various methods are needed to solve this problem.

In particular, the single tone transmission scheme is considered to be an important part in NB-IoT system design because of the feature that does not increase the PAPR.

However, since a narrow tone single tone transmission method is specialized for low data rate, power consumption due to an increase in transmission time or a terminal requiring a high data rate is required. consumption problem should be solved.

Accordingly, the present specification provides various methods for supporting single tone transmission in the NB-IoT system to solve this problem.

Each method will be described in more detail with respect to a method for supporting single tone transmission.

제 1 실시 예First embodiment

The first embodiment provides a method for supporting single tone transmission by determining a size of subcarrier spacing according to coverage of a terminal or transmission data characteristics of the terminal.

That is, the first embodiment may be called an adaptive subcarrier spacing method.

NB-IoT system is a system for supporting a plurality of terminals (massive number of low throughput devices) having a low data rate.

Therefore, in the NB-IoT system, while the coverage extension is satisfied, the terminal (s) must satisfy a low transmit power condition.

In relation to the subcarrier spacing of the NB-IoT system, subcarrier spacings of various sizes are currently discussed.

In general, the NB-IoT system considers subcarrier spacings having a smaller size than the conventional LTE (-A) system for the characteristics of a narrowband system.

In particular, the NB-IoT system based on SC-FDMA in the uplink is affected by subcarrier spacing.

For example, as the subcarrier spacing decreases, the number of subcarriers that can be allocated per same bandwidth increases, which makes it more advantageous to ensure multiple connectivity.

On the other hand, if the subcarrier spacing is increased, the number of usable subcarriers is reduced, but the frame duration can be reduced.

Therefore, since the transmission time of the uplink is shortened, there is an advantage that the power efficiency of the terminal can be increased.

As such, since there are advantages and disadvantages according to the size of the subcarrier spacing, it is advantageous to determine the size of the subcarrier spacing according to the situation when the terminal can support various subcarrier spacings.

Accordingly, the first embodiment provides a method of determining the size of a subcarrier spacing and using the same when the terminal supports various subcarrier spacings in an NB-IoT situation.

The NB-IoT system requires a 20 dB coverage extension compared to the legacy GPRS (General Packet Radio Service).

On the other hand, the maximum transmit power of the terminal is limited to 23 dBm.

Under these conditions, UEs at the cell edge obtain an extension of coverage by transmitting a signal for a long transmit time using a small subcarrier spacing of a small size.

However, when the coverage is small, the UEs having a good link budget may be damaged in terms of transmission power and time domain resources due to an increase in symbol duration due to a decrease in subcarrier spacing size.

Link budget refers to a prediction task that satisfies the performance (gain, loss, bit error rate, etc.) required on a given communication link.

In consideration of this point, it may be desirable for each UE to transmit a signal by determining a subcarrier spacing suitable for its coverage.

Referring to FIG. 21, since the subcarrier group A 2110 has a relatively good link budget performance, the subcarrier group A 2110 shows a group of terminals that have a large subcarrier spacing instead of a short transmission time.

On the other hand, subcarrier group B (2120) shows a relatively low link budget performance and ensures a long transmit time, and represents a group of UEs that have a small subcarrier spacing.

In this case, the method of determining the size of the subcarrier spacing may be considered as a function of link budget.

As shown in FIG. 21, when different subcarrier spacings are applied according to coverage, several UEs may divide time axis resources in a subcarrier group having a relatively large subcarrier spacing. For this, refer to FIG. 22.

For example, when the size of the subcarrier spacing of the subcarrier group A is L times larger than the subcarrier spacing of the subcarrier group B, the subcarrier group A L terminals may participate in the subcarrier group A during the time allocated to the subcarrier group B.

FIG. 22 illustrates an example in which the subcarrier spacing of the subcarrier group B 2220 is twice as large as the subcarrier spacing of the subcarrier group A 2210.

That is, referring to FIG. 22, when the time allocated to each group is the same, it can be seen that the subcarrier group B can participate twice as many times as the subcarrier group A.

In addition, the subcarrier spacing in the NB-IoT system may be determined according to the characteristics of the data transmitted by the terminal.

In case of a terminal requiring a low data rate, a large number of subcarriers can be increased by increasing the number of total subcarriers using small subcarrier spacing.

However, in case of a terminal requiring a high data rate, the data rate may be increased by using all of the spare resources on the time axis generated while increasing the subcarrier spacing.

A description thereof is shown in FIG. 23.

That is, FIG. 23 illustrates an example in which subcarrier spacing differs twice between subcarrier groups according to data characteristics.

In FIG. 23, subcarrier group A 2310 represents a group of terminals having a low data rate, and subcarrier group B 2320 represents a group of terminals having a high data rate.

That is, the subcarrier group B can increase the data rate by using more spare resources in the time domain than the subcarrier group A.

Referring to FIG. 24, the terminal determines subcarrier spacing used for single tone transmission according to a predetermined criterion (S2410).

The predetermined criterion may be a coverage of the terminal or a transmission data characteristic of the terminal.

More specifically, the UE determines a relatively small subcarrier spacing when its coverage is narrow (eg, when the coverage of the UE is smaller than a threshold).

The relatively small meaning may mean smaller than a specific threshold.

On the other hand, the UE determines a relatively large subcarrier spacing when its coverage is wide (eg, when the coverage of the UE is larger than a threshold).

The relatively large meaning may mean greater than a specific threshold.

In addition, when the characteristic of the transmission data of the terminal is a low data rate, the terminal determines a relatively small subcarrier spacing.

On the other hand, if the characteristic of the transmission data of the terminal is a high data rate, the terminal determines a relatively large subcarrier spacing.

Thereafter, the terminal transmits a single tone having the determined subcarrier spacing to the base station (S2420).

The single tone may mean one subcarrier and may be used in a narrowband of 200 kHz or less.

That is, the subcarrier spacing may be 15 kHz, 3.75 kHz, or the like.

In addition, UEs using the same subcarrier spacing may configure specific UE groups.

For example, terminals using a first subcarrier spacing may configure a first terminal group, and terminals using a second subcarrier spacing may configure a second terminal group.

It may be assumed that the first subcarrier spacing has a smaller value than the second subcarrier spacing.

As such, the base station may receive a single tone having different subcarrier spacings from each terminal belonging to different terminal groups classified according to subcarrier spacings.

제 2 실시 예Second embodiment

The second embodiment uses NB-IoT by using a code pattern method using phase rotation or tone shifting in phase shift keying (PSK) modulation. The system provides a method for supporting single tone transmission.

That is, the second embodiment provides a method of increasing the data rate or piggybacking control information simultaneously with data by transmitting additional bits by using a code pattern method.

The method of the second embodiment may be called or represented by a code pattern PSK modulation method.

When the modulation order is M in a PSK modulation-based system, each symbol mapped to each other orthogonal communication resources represents a log ₂ M bit.

At this time, in order to further increase the number of bits that can be transmitted, there may be a method of increasing the number of subcarriers used or increasing the modulation order.

In particular, since the number of available subcarriers is limited in the NB-IoT system, a method of increasing the modulation order or using a position in which information is mapped among multiple subcarriers can be considered as an additional information amount.

Factors that should be dealt with in such modulation methods are limitations of communication resources such as usable subcarriers, number of symbols, transmit power, etc. and PAPR performance of uplink UEs.

Accordingly, the second embodiment proposes a method of increasing the modulation order without increasing the PAPR or generating additional communication resources.

In particular, the second embodiment modulates phase rotation information that each symbol may have in the time domain and information about a position where tone (or subcarrier) shifting occurs. How to use to increase.

In a conventional FDMA system using PSK modulation, one PSK signal is mapped and transmitted to each symbol in a time domain.

In this case, all time domain symbols use the same constellation, and there is no transmission of additional information due to the pattern difference between the symbols.

In addition, in the case of the PSK modulation scheme considering the phase rotation, phase rotation between time domain symbols may be utilized to lower the PAPR characteristic of the transmission signal.

At this time, phase rotation is performed periodically, and there is no addition of information amount according to the change of constellation due to phase rotation.

Accordingly, the second embodiment proposes a method of using a code pattern for increasing data rate or transmitting additional information such as control information in a system using PSK modulation.

The second embodiment considers a method of assigning a code pattern based on a position at which various states of available resources are shifted while maintaining a PSK modulation order.

Resources used to assign the code pattern may include tone shifting using multiple tones and phase rotation of the PSK.

That is, in the second embodiment, in order to transmit additional information, (1) a code pattern method using phase rotation of PSK modulation (method 1) and (2) a code pattern method using tone shifting in multiple tones (method 2) It can be divided into

In addition, in the PSK modulation method of the code pattern proposed in the second embodiment, a set of symbols having an arbitrary length is defined as one symbol set.

This may be expressed as a specific set of resources.

Therefore, when there is a symbol set of length N (or including N symbols), modulation is determined so that a change in the PSK mapping scheme occurs once within the symbol set, and used as pattern information of the symbol. This is an example, and modulation may be determined so that a change of the PSK mapping scheme occurs several times.

For example, the pattern for a symbol set of length 4 is (1,0,0,0), (0,1,0,0), (0,0,1,0), and (0,0,0). Four patterns of, 1) can be used.

In these four patterns, the position of '1' (or the value of '1') means the part where the PSK mapping changes.

That is, in the case of (0,0,1,0) pattern, if the first two symbols (the first symbol and the second symbol) follow the mapping scheme A, after the third symbol where '1' appears (that is, the third symbol) symbol and fourth symbol) Use mapping method B.

Such a change in the PSK mapping method may be used in the form of a kind of code (that is, a code pattern), and the generated code pattern may be used for an increase in a transmission rate or a multiplexing method.

The code pattern method may also be used for the purpose of piggyback transmitting uplink control information simultaneously with data.

For example, 1-bit ACK / NACK information is transmitted using a narrowband physical uplink shared channel (NPUSCH) without configuring a separate control channel in the NB-IoT system.

At this time, the 1-bit ACK / NACK signal (or information) is transmitted independently without being piggybacked on other uplink data or PUSCH.

In the case of applying the method of the second embodiment of the present invention, it may be defined to transmit the 1-bit ACK / NACK signal through a position where the PSK mapping scheme changes.

For example, when the ACK / NACK signal is expressed through a position where the PSK mapping changes (symbol) in one slot unit, the ACK information is changed when the PSK mapping changes in the nth symbol in one slot. If the PSK mapping is changed in the m th symbol in the slot of the slot can be defined to represent the NACK information.

That is, in the example of the symbol set pattern, the transmission of the ACK signal may be indicated in the case of the pattern of (0,1,0,0), and in the case of the pattern of (0,0,1,0). Can indicate transmission.

As another example, it may be defined to express ACK / NACK using whether a change in the PSK mapping scheme occurs.

For example, when a change in PSK mapping occurs in one slot, an ACK may be expressed, or a NACK may be expressed.

When using this method, NB-IoT terminals can piggy back with NPUSCH transmission without using a separate resource for ACK / NACK.

Here, the location of the transmission slot or subframe of the NPUSCH transmitted by piggybacking the ACK / NACK information may be informed by the base station (eNodeB) to the terminal through RRC signaling or Downlink Control Information (DCI).

Alternatively, in order to increase the reliability of the ACK / NACK, it may be defined that the representation of the ACK / NACK is continuously maintained in every slot or all subframe positions while uplink transmission (or NPUSCH transmission) is maintained.

At this time, the manner in which ACK / NACK is expressed in consecutive slots or subframes may be repeated in the same manner, or may be defined to follow a specific pattern.

If the same type of expression is repeated to transmit ACK / NACK, this may be the purpose of obtaining the effect of repetition gain.

When the expression of the same method is repeated, it may mean that the location where the PSK mapping occurs is the same or whether the PSK mapping occurs is the same.

In addition, when transmission of ACK / NACK is defined to follow a specific pattern, it may be an object for distinguishing a change in PSK mapping for each cell.

If the ACK / NACK is transmitted according to the specific pattern, the specific pattern may be a value determined by a parameter known to the base station and the terminal in advance, such as a predetermined function, a cell ID, and a system frame number (SFN). Alternatively, the base station may use a value informed by the base station to the terminal through RRC signaling or DCI.

In order to support transmission using this piggyback method, a physical channel may be newly defined in the NB-IoT system.

The newly defined physical channel may basically follow the same or similar structure as the NPUSCH format 1, and the DMRS (Demodulation Reference Signal) density may also follow the NPUSCH format 1.

The DMRS density may be interpreted as indicating an increase / decrease in the number of symbols in which a DMRS is transmitted in a specific unit.

Here, the same or similar structure as that of NPUSCH format 1 may mean that the number of slots, the number of tones, and the like are the same or similar.

However, a newly defined format for piggyback may be defined such that one PSK mapping change occurs in one slot or one subframe.

Alternatively, DMRS density may be increased similarly to NPUSCH format 2 in consideration of reliability of ACK / NCAK.

In this case, the number of slots constituting a resource unit (RU) may increase compared to NPUSCH format 1 to compensate for the number of data symbols that decrease according to the increasing density of DMRS.

The resource unit (RU) is a resource unit newly defined in the NB-IoT system and used to map an NPUSCH to a resource element (RE).

In addition, one resource unit may be defined as consecutive symbols in the time domain and consecutive subcarrier numbers in the frequency domain.

The number of consecutive symbols may be determined by the number of uplink symbols defined and the number of uplink slots defined, and the number of consecutive subcarriers may be determined by the number of subcarriers of the defined resource unit.

Hereinafter, (1) method 1 using phase rotation pattern and (2) method 2 using tone shifting pattern will be described as specific mapping methods of the code pattern PSK modulation method proposed in the second embodiment.

방법 1: 위상 회전 패턴 Method 1: phase rotation pattern PSKPSK 변조(Phase-rotation Pattern Phase-rotation Pattern PSKPSK (PP-(PP- PSKPSK ) Modulation) 방법Modulation method

First, let's look at Method 1.

Method 1, namely the phase-rotation pattern PSK (PPPSK) modulation method, is used to determine both the phase and position of the phase rotation of a signal determined according to the PSK order. This is the method used for transmission.

For convenience, PPPSK modulation using N symbols and M-ary PSK signals will be referred to as (N, M) -PPPSK.

In the (N, M) -PPPSK method, a PSK modulated signal is mapped to each symbol, and one phase rotation occurs.

After the phase rotation occurs, the symbols follow the changed phase rotation.

In addition, the position where the phase rotation occurs is determined by the pattern that the symbol can have.

In the Salping example above, for PPPSK modulation with a length of N = 4, the types (or types) of patterns that can have are (1,0,0,0), (0,1,0,0), (0, There may be four of 0, 1, 0), and (0, 0, 0, 1).

In each pattern, '0' means phase rotation does not occur and '1' means phase rotation.

Here, the value of '0' or '1' may represent a value corresponding to the index of each symbol in the corresponding pattern.

Thus, in the pattern of (1,0,0,0), all the symbols (four symbols) have the same constellation.

The pattern of (0,1,0,0) and the pattern of (0,0,0,1) have the same constellation of three symbols (second to fourth symbols), and (0,0,1,0 ), The two symbols (third symbol and fourth symbol) have the same constellation.

Even when the value of N is selected as another value, it may have N patterns in the same manner as the above example.

Herein, the size (or value) of N may be freely or variably determined according to the characteristics required by the NB-IoT system.

In addition, the PPPSK modulation method of Method 1 may use not only phase rotation in symbol units but also phase rotation differences between symbol sets in which a plurality of symbols are bundled.

The symbol set may be a slot, a subframe, a resource unit, a frame, or the like.

For example, the method 1 of the second embodiment of the present invention may be applied in the same manner by using a phase rotation pattern in a subframe or frame unit in which several symbols are collected.

In this case, the term of the symbol pattern 2510 in FIG. 25 may be represented by a slot pattern, a subframe pattern, a frame pattern, and the like.

That is, in FIG. 25, a value of '0' or '1' may indicate a value corresponding to a slot and subframe index.

In this case as well, a value of '1' may indicate that phase rotation occurs.

For example, a value of '1' may indicate that phase rotation does not occur, and a value of '0' may indicate that phase rotation occurs.

In addition, the degree (or value) of phase rotation occurring at the position where each phase rotation occurs may be defined to be determined by the modulation order M of the PSK.

That is, signals represented by phase rotation should be distinguished from signals in which phase rotation does not occur.

In addition, the values of constellations due to phase rotation determine the minimum distance to the constellation before phase rotation to be maximum.

As one method for this, when M-ary PSK is used, the degree or value at which phase rotation occurs may be set to ∏ / M.

In FIG. 25, the case where N = 4 and M = 4 is shown.

Information related to the configuration of the symbol pattern (symbol pattern configuration) used in the PPPSK modulation method of Method 1 is determined by the base station and transmitted to the terminal, so that the terminal can be defined to follow this.

For example, the information related to the configuration of the symbol pattern may include symbol number information indicating the number of symbols that are the structural units of the symbol pattern.

The symbol number information may directly inform the number of symbols, or may use index information corresponding to the number of symbols by making the number of symbols usable in advance in a table form.

Here, the number of symbols may be determined by a set unit for a plurality of symbols such as slots or subframes.

Information related to the configuration of the symbol pattern may include bit size information indicating the size of a bit additionally transmitted through the phase rotation pattern of the symbol.

The bit size information may indicate the number of bits per se and may be configured with information about the frequency of phase rotation occurring in one symbol set.

The information related to the configuration of the salping symbol pattern may inform the terminal through RRC signaling or DCI.

방법 2: 톤-이동 패턴 Method 2: tone-shift pattern PSKPSK 변조(Tone shifting Pattern Modulation (Tone shifting Pattern PSKPSK ( ( TPPSKTPPSK ) Modulation) 방법Modulation method

Next, look at Method 2.

Method 2 In other words, the Tone shifting pattern PSK (TPPSK) modulation method is a method of utilizing the time when the position of the tone to which the information generated by the PSK is mapped is shifted as additional information.

Here, tone means a subcarrier.

For convenience, TPPSK modulation considering L tones, PSK of M modulation order, and N symbols will be defined as (L, M, N) -TPPSK modulation.

In the TPPSK modulation method, a total of L tones are used, but the number of tones actually used for transmitting one symbol is one.

That is, the basic premise is a single tone transmission proposed in this specification.

In method 2, one tone shifting occurs while N symbols are in progress. This is an example, and may be defined so that two or more tone shiftings occur according to the number of tones.

When the information on the position where the tone shifting occurs is used as additional information, a total of (L-1) X N patterns may be generated according to the position of the shifted tone index.

Here, L represents the total number of tones, and N represents the interval of tone shifting.

For example, for the TPPSK modulation method of L = 4 and N = 4, (1,0,0,0), (0,1,0,0), (0,0,1,0), (0, 0,0,1), (2,0,0,0), (0,2,0,0), (0,0,2,0), (0,0,0,2), (3, A total of 12 patterns of 0,0,0), (0,3,0,0), (0,0,3,0), and (0,0,0,3) can occur.

At this time, the values of 1,2 and 3 are values indicating the index of the tone shifted through tone shifting.

The tone of the subsequent symbols from the time of the tone shifting is maintained until the tone shifting in the next symbol set.

In the case of Fig. 26, an example of (4,4,4) -TPPSK modulation is shown.

That is, a tone-shifting pattern PSK modulation method in the case where four tones, a PSK (QPSK) of modulation order 4, and four symbols form one symbol pattern.

The information related to the configuration of the symbol pattern (symbol pattern configuration) used in the TPPSK modulation method of Method 2 is determined by the base station, and the base station transmits the information related to the configuration of the symbol pattern to the terminal so that the terminal can follow it. have.

For example, the information related to the configuration of the symbol pattern may include symbol number information indicating the number of symbols that are a unit of the symbol pattern.

The symbol number information may directly inform the number of symbols, or use index information corresponding to the number of symbols by making the number of symbols usable in advance in a table form.

Here, the number of symbols may be determined in units of a set of several symbols, such as a slot or a subframe.

In addition, the information related to the configuration of the symbol pattern may include additional bit size information indicating the size of the bit added through the tone shifting pattern of the symbol.

The additional bit size information may directly indicate the number of bits, or may be configured as information on the frequency of tone shifting in one symbol set.

Information related to the configuration of the symbol pattern may be informed by the device station to the terminal through RRC signaling or downlink control information (DCI).

When information related to the symbol pattern configuration is known to the UE through the DCI, the DCI may use an NB Physical Downlink Control Channel (NPDCCH).

First, the terminal receives configuration information of a code pattern related to transmission of additional information from the base station (S2710).

The configuration information of the code pattern includes symbol number information indicating the number of symbols included in the first information block, size information indicating the size of the second information block, or the number of times the phase rotation or the tone shifting occurs. It may include at least one of the information indicating.

In addition, the configuration information of the code pattern may be received from the base station through RRC (Radio Resource Control) signaling or downlink control information (DCI).

The DCI may be transmitted through a narrowband physical downlink control channel (NPDCCH).

Thereafter, the terminal configures a first information block by using a phase shift keying (PSK) modulation method (S2720).

In addition, the terminal configures the second information block by using phase rotation or tone shifting of the first information block based on the received configuration information of the code pattern (S2730).

The first information block may include a plurality of symbols and may be represented by a specific resource set.

The second information block is constituted by phase rotation or tone shifting between symbols in the first information block or between symbol groups.

The additional information generated by the aforementioned code pattern may mean the second information block.

The symbol group may be a slot unit, a subframe unit, a resource unit (RU) unit, or a frame unit.

And the size of the second information block is determined based on the number of occurrences of the phase rotation or the tone shifting.

Here, the degree (or value) of phase rotation between the symbols or the symbol groups constituting the second information block may be a value obtained by dividing ∏ by a modulation order of PSK.

In addition, in the configuration of the second information block, that is, the code pattern, the UE may perform different PSK modulation on symbols before the phase rotation or the tone shifting and symbols after the phase rotation or the tone shifting. You can use the mapping method.

In addition, the terminal may use the same PSK modulation mapping scheme for symbols after the phase rotation or the tone shifting occurs.

If the second information block may be uplink control information.

The uplink control information may be acknowledgment (ACK) or non-acknowledgement (NACK) information.

If the second information block is acknowledgment (ACK) or non-acknowledgement (NACK) information, whether the second information block transmits ACK information or NACK information according to the number of times of phase rotation or tone shifting. Can be determined.

In addition, the ACK or NACK information may be repeatedly transmitted to the base station for a predetermined time.

The uplink signal including the first information block and the second information block may be transmitted using NNB-Physical Uplink Shared Channel (NPUSCH) format 1.

Thereafter, the terminal transmits an uplink signal including the first information block and the second information block to the base station through a single tone having a specific subcarrier spacing (S2740).

Here, the specific subcarrier spacing may be a subcarrier spacing defined in a narrowband (NB) of 200 kHz or less, for example, 15 kHz, 3.75 kHz, or the like.

본 발명이 적용될 수 있는 장치 일반General apparatus to which the present invention can be applied

Referring to FIG. 28, a wireless communication system includes a base station 2810 and a plurality of terminals 2820 located in an area of a base station 2810.

The base station 2810 includes a processor 2811, a memory 2812, and an RF unit 2813. The processor 2811 implements the functions, processes, and / or methods proposed in FIGS. 1 to 27. Layers of the air interface protocol may be implemented by the processor 2811. The memory 2812 is connected to the processor 2811 and stores various information for driving the processor 2811. The RF unit 2813 is connected to the processor 2811 and transmits and / or receives a radio signal.

The terminal 2820 includes a processor 2821, a memory 2822, and an RF unit 2823. The processor 2821 implements the functions, processes, and / or methods proposed in FIGS. 1 to 27. Layers of the air interface protocol may be implemented by the processor 2821. The memory 2822 is connected to the processor 2821 and stores various information for driving the processor 2821. The RF unit 2823 is connected to the processor 2821 and transmits and / or receives a radio signal.

The

memories

2812 and 2822 may be inside or outside the

processors

2811 and 2821, and may be connected to the

processors

2811 and 2821 by various well-known means.

In addition, the base station 2810 and / or the terminal 2820 may have a single antenna or multiple antennas.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The scheme for transmitting an uplink signal in the wireless communication system of the present specification has been described with reference to the example applied to the 3GPP LTE / LTE-A system, but is applied to various wireless communication systems such as 5G system in addition to the 3GPP LTE / LTE-A system. It is possible to do

Claims

In the method for transmitting an uplink signal in a wireless communication system, the method performed by the terminal,

Receiving configuration information of a code pattern related to transmission of additional information from a base station;

Constructing a first information block using a phase shift keying (PSK) modulation scheme;

Constructing a second information block using phase rotation or tone shifting of the first information block based on the configuration information of the received code pattern; And

And transmitting an uplink signal including the first information block and the second information block to the base station through a single tone having a specific subcarrier spacing. .
The method of claim 1,

The first information block includes a plurality of symbols,

And wherein the second information block is configured by phase rotation or tone shifting between symbols in the first information block or between symbol groups.
The method of claim 2,

The symbol group may be a slot unit, a subframe unit, a resource unit (RU) unit, or a frame unit.
The method of claim 1,

The configuration information of the code pattern includes symbol number information indicating the number of symbols included in the first information block, size information indicating the size of the second information block, or the number of times the phase rotation or the tone shifting occurs. And at least one of the information indicative of the information.
The method of claim 1,

The configuration information of the code pattern is received from the base station through RRC (Radio Resource Control) signaling or downlink control information (DCI).
The method of claim 1,

The additional information is the second information block;

And wherein the second information block corresponds to the code pattern.
The method of claim 2,

And a symbol before the phase rotation or the tone shifting occurs and a symbol after the phase rotation or the tone shifting use different PSK modulation mapping schemes.
The method of claim 7, wherein

And the symbols after the phase rotation or tone shifting have the same PSK modulation mapping scheme.
The method of claim 1,

And the size of the second information block is determined based on the number of occurrences of the phase rotation or the tone shifting.
The method of claim 1,

And wherein the value of phase rotation is determined by dividing ∏ by the modulation order of the PSK.
The method of claim 1,

And the second information block is acknowledgment (ACK) or non-acknowledgement (NACK) information.
The method of claim 11,

And determining whether the second information block is ACK information or NACK information according to the number of times of phase rotation or tone shifting.
The method of claim 11,

The ACK or NACK information is characterized in that it is repeatedly transmitted for a predetermined time to the base station.
The method of claim 11,

The uplink signal is characterized in that using the NPUSCH (Physical Uplink Shared Channel) format (1).
The method of claim 1,

Wherein the specific subcarrier spacing is a subcarrier spacing defined in a narrowband (NB) of 200 kHz or less.
A terminal for transmitting an uplink signal in a wireless communication system,

An RF unit for transmitting and receiving radio signals; And

A processor functionally connected with the RF unit, wherein the processor includes:

Receive configuration information of a code pattern related to transmission of additional information from a base station;

Configure a first information block using a phase shift keying (PSK) modulation scheme;

Configure a second information block by using phase rotation or tone shifting of the first information block based on the configuration information of the received code pattern; And

And transmitting the uplink signal including the first information block and the second information block to the base station through a single tone having a specific subcarrier spacing.