KR20200036717A - A METHOD AND APPARATUS FOR Transmission and reception of feedback for groupcast IN A WIRELSS CELLULAR COMMUNICATION SYSTEM - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5G communication system with an IoT technology to support a higher data transmission rate than that of a 4G system and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. Disclosed in the present invention are an HARQ-ACK feedback method, an automatic gain control method, and an apparatus applicable to communication between terminals. According to the present invention, a control signal processing method in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the first control signal received; and transmitting a second control signal generated based on the processing to the base station.

Description

A METHOD AND APPARATUS FOR Transmission and reception of feedback for groupcast IN A WIRELSS CELLULAR COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system, and specifically to a method and apparatus for transmitting HARQ-ACK feedback for groupcast data communication. It also relates to a method and apparatus for more efficiently performing automatic gain control for control and data signal reception in a side link.

Efforts have been made to develop an improved 5G communication system or a pre-5G communication system to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a 4G network (Beyond 4G Network) communication system or an LTE system (Post LTE) system. To achieve high data rates, 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, 60 gigahertz (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive array multiple input / output (massive MIMO), full dimensional multiple input / output (FD-MIMO) ), Array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in the 5G communication system, the evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, mobile network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation Technology development is being conducted. In addition, in 5G systems, advanced coding modulation (Advanced Coding Modulation (ACM)), hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), and advanced access technologies, FBMC (Filter Bank Multi Carrier), and NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges information between distributed components such as objects. Internet of Everything (IoE) technology, in which big data processing technology, etc. through connection to a cloud server, is combined with IoT technology is also emerging. In order to implement IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, a machine to machine (Machine to Machine) , M2M), and MTC (Machine Type Communication). In an IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects to create new values in human life may be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, high-tech medical service through convergence and complex between existing IT (information technology) technology and various industries. It can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, 5G communication technology such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) is implemented by techniques such as beamforming, MIMO, and array antenna. It is. It may be said that the application of cloud radio access network (cloud RAN) as the big data processing technology described above is an example of 5G technology and IoT technology convergence.

In addition, communication between terminals using a 5G communication system (or 5G and LTE) is being researched and may be referred to as sidelink communication.

There is a need to provide a method and apparatus for efficiently performing such communication between terminals. Specifically, a method and apparatus for transmitting HARQ-ACK feedback for the groupcast communication and an apparatus and an automatic gain control method for receiving signals on the sidelink should be provided.

The present invention for solving the above problems is a control signal processing method in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

According to the present invention, when a terminal capable of performing inter-terminal communication performs groupcast communication, HARQ-ACK feedback can be efficiently performed, and automatic gain control is performed through an automatic gain control method and apparatus proposed in the present invention. By reducing the time, more reliable signal reception can be performed.

1 is a diagram illustrating a downlink or uplink time-frequency domain transmission structure of a 5G (or NR, New Radio) system.
FIG. 2 is a diagram showing an example in which eMBB, URLLC, and mMTC data are allocated in a frequency-time resource in a communication system.
3 is a diagram showing another example in which eMBB, URLLC, and mMTC data are allocated in a frequency-time resource in a communication system.
4 is a diagram illustrating an example in which one transport block is divided into multiple code blocks and a CRC is added.
FIG. 5 is a diagram illustrating an example of groupcasting in which one terminal transmits common data to a plurality of terminals.
FIG. 6 is a diagram illustrating a process in which terminals receiving common data through group casting transmit information related to success or failure of data reception to a terminal transmitting data.
7 is a view showing a state in which a synchronization signal and a physical broadcast channel of an NR system are mapped in a frequency and time domain.
8 is a diagram illustrating which symbols are mapped to one SS / PBCH block in a slot.
FIG. 9 is a view showing which SS / PBCH blocks can be transmitted from among symbols within 1 ms according to subcarrier intervals.
FIG. 10 is a view showing which SS / PBCH blocks can be transmitted in which slots and symbols within 5 ms according to subcarrier intervals.
FIG. 11 is a diagram illustrating an example in which HARQ-ACK feedback is transmitted by terminals in a group using common resources when transmitting groupcast data according to the present invention.
12 is a diagram illustrating an example in which the terminals in a group transmit HARQ-ACK feedback using different resources when transmitting groupcast data according to the present invention.
13 is a diagram showing an example of a structure of an apparatus for performing automatic gain control in a receiver structure of a conventional terminal.
FIG. 14 is a diagram illustrating a process of amplifying a signal strength in an appropriate step by performing automatic gain control in a time domain.
15 is a diagram illustrating a process in the time domain of amplifying a signal strength to an appropriate step by performing automatic gain control when a signal transmitted at a wide subcarrier interval is received.
16 is a view showing an example of an apparatus for performing AGC by appropriately setting an initial value in order to reduce the time for performing automatic gain control provided by the present invention.
FIG. 17 is a diagram showing a process in the time domain of amplifying a signal strength to an appropriate step by performing automatic gain control according to the automatic gain control method provided by the present invention.
18 is a diagram illustrating an example in which a base station transmits a signal by applying another analog beam according to a symbol.
19 is a diagram illustrating an example of a terminal receiving signals from various TRPs.
20 is a diagram illustrating an internal structure of a terminal according to embodiments of the present invention.
21 is a diagram showing the internal structure of a base station according to embodiments of the present invention.
22A is a diagram illustrating a channel coding and decoding process when an outer code is not used.
22B is a diagram showing a channel coding and decoding process when an outer code is used.
23 is a diagram illustrating a process of obtaining code blocks (CBs) and parity bit CBs (PCBs) in a wireless communication system according to various embodiments of the present disclosure.
24 is a diagram illustrating a signal flow diagram illustrating a process of data transmission between a transmitting device and receiving devices in a wireless communication system according to various embodiments of the present disclosure.
25 is a flowchart illustrating a transmission apparatus for performing retransmission in a wireless communication system according to various embodiments of the present disclosure.

The new 5G communication, NR (New Radio access technology), is designed to allow multiple services to be freely multiplexed in time and frequency resources, and accordingly, waveforms, numerology, and reference signals can be used. It can be allocated dynamically or freely as needed. In the NR system, the types of supported services can be divided into categories such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC) (mMTC), and Ultra-Reliable and Low-latency Communications (URLLC). It can be considered that the high-speed transmission, mMTC is a service aimed at minimizing terminal power consumption and accessing multiple terminals, and URLLC is aiming for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal.

Meanwhile, as research on a next-generation communication system has recently been conducted, various methods for scheduling communication with a terminal are being discussed. Accordingly, an efficient scheduling and data transmission / reception method considering characteristics of a next-generation communication system is required.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents well known in the technical field to which the present invention pertains and which are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. The same reference numbers are assigned to the same or corresponding elements in each drawing.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

At this time, it will be understood that each block of the process flow chart drawings and combinations of the flow chart drawings can be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer or other programmable data processing equipment, those instructions performed through a processor of a computer or other programmable data processing equipment are described in flowchart block (s). It creates a means to perform functions. These computer program instructions can also be stored in computer readable or computer readable memory that can be oriented to a computer or other programmable data processing equipment to implement a function in a particular way, so that computer readable or computer readable memory It is also possible for the instructions stored in to produce an article of manufacture containing instructions means for performing the functions described in the flowchart block (s). Since computer program instructions may be mounted on a computer or other programmable data processing equipment, a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer to generate a computer or other programmable data. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block (s).

Also, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, it is also possible that the functions mentioned in the blocks occur out of sequence. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or it is also possible that the blocks are sometimes executed in reverse order according to a corresponding function.

At this time, the term '~ unit' used in this embodiment means a hardware component such as software or an FPGA or an ASIC, and '~ unit' performs certain roles. However, '~ wealth' is not limited to software or hardware. The '~ unit' may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors. Thus, as an example, '~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The functions provided within components and '~ units' may be combined into a smaller number of components and '~ units', or further separated into additional components and '~ units'. In addition, the components and '~ unit' may be implemented to play one or more CPUs in the device or secure multimedia card. Also, in the embodiment, '~ unit' may include one or more processors.

In describing the present invention, when it is determined that a detailed description of related functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, a base station is a subject that performs resource allocation of a terminal, and may be at least one of a gNode B (gNB), an eNode B (eNB), a Node B, a BS (Base Station), a radio access unit, a base station controller, or a node on a network. have. The terminal may perform a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a vehicle or vehicle, or a pedestrian or road side unit (RSU), computer, or communication function. It may include a multimedia system. In the present invention, the downlink (Downlink, DL) is a wireless transmission path of a signal transmitted by the base station to the terminal, and the uplink (Uplink, UL) means a wireless transmission path of a signal transmitted by the terminal to the base station. In addition, although the embodiment of the present invention will be described below using the NR system as an example, the embodiment of the present invention may be applied to other communication systems having similar technical backgrounds or channel types. In addition, the embodiments of the present invention can be applied to other communication systems through some modifications within a range not departing greatly from the scope of the present invention as judged by a skilled person.

In the present invention, the terms physical channel and signal can be used interchangeably with data or control signals. For example, PDSCH is a physical channel through which data is transmitted, but in the present invention, PDSCH may be referred to as data.

Hereinafter, in the present invention, the upper signaling is a signal transmission method transmitted from a base station to a terminal using a downlink data channel of a physical layer, or a signal transmission method transmitted from a terminal to a base station using an uplink data channel of a physical layer, RRC signaling or MAC control element (CE; control element) may be referred to.

The wireless communication system deviates from providing an initial voice-oriented service, for example, 3GPP High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced Advances into a broadband wireless communication system that provides high-speed, high-quality packet data services such as (LTE-A), 3GPP2 High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e. Doing. In addition, a 5G or NR (new radio) communication standard is being developed as a fifth generation wireless communication system.

In the NR system, which is a typical example of the wideband wireless communication system, an downlink (DL) and uplink OFDM (orthogonal frequency division multiplexing) scheme is adopted. More specifically, a cyclic-prefix OFDM (CP-OFDM) scheme is employed in the downlink, and two types of a discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme are employed in the uplink in addition to the CP-OFDM. In the multiple access method, data or control information of each user is usually distinguished by assigning and operating so that time-frequency resources for carrying data or control information for each user do not overlap with each other, that is, orthogonality is established. .

The NR system employs a hybrid automatic repeat reQuest (HARQ) method that retransmits the corresponding data in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ method, when the receiver fails to correctly decode (decode) data, the receiver transmits information (Negative Acknowledgement, NACK) indicating that the transmitter has failed decoding, so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines data retransmitted by the transmitter with data that has previously failed to improve data reception performance. In addition, when the receiver correctly decodes data, the receiver may transmit information (Acknowledgement, ACK) informing the transmitter of decoding success so that the transmitter can transmit new data.

FIG. 1 is a diagram showing a basic structure of a time-frequency domain, which is a radio resource domain in which the data or control information is transmitted in a downlink or uplink in an NR system.

In FIG. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb OFDM symbols 102 are collected to form one slot (106). The length of the subframe is defined as 1.0ms, and the radio frame 114 is defined as 10ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is composed of a total of N _BW subcarriers 104.

The basic unit of resources in the time-frequency domain is a resource element (RE, 112), which can be represented by an OFDM symbol index and a subcarrier index. The resource block (Resource Block, RB or Physical Resource Block, PRB, 108) is defined by N _symb consecutive OFDM symbols 102 in the time domain and N _RB consecutive subcarriers 110 in the frequency domain. Therefore, one RB 108 is composed of N _symb x N _RB REs 112. Generally, the minimum transmission unit of data is the RB unit. In an NR system, N _symb = 14, N _RB = 12, and N _BW is proportional to the bandwidth of the system transmission band. The data rate may increase in proportion to the number of RBs scheduled for the terminal. In the case of an FDD system in which the downlink and uplink of the NR system are divided into frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 1 and Table 2 show some of the correspondence between the system transmission bandwidth, subcarrier spacing and channel bandwidth defined in the NR system in a frequency band lower than 6 GHz and a frequency band higher than 6 GHz, respectively. For example, an NR system having a 100 MHz channel bandwidth with a 30 kHz subcarrier width consists of 273 RBs of transmission bandwidth. In the following, N / A may be a bandwidth-subcarrier combination not supported by the NR system.

Channel bandwidth
BW _Channel [MHz] Subcarrier width 5 10 20 50 80 100 Transmission bandwidth configuration N _RB 15 kHz 25 52 106 270 N / A N / A 30 kHz 11 24 51 133 217 273 60 kHz N / A 11 24 65 107 135

Channel bandwidth
BW _Channel [MHz] Subcarrier width 50 100 200 400 Transmission bandwidth configuration N _RB 60 kHz 66 132 264 N / A 120 kHz 32 66 132 264

In the NR system, scheduling information for downlink data or uplink data is transmitted from a base station to a terminal through downlink control information (DCI). DCI is defined according to various formats, and whether it is scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data according to each format, or whether compact DCI has a small control information size. , Whether or not spatial multiplexing using multiple antennas is applied, whether DCI is used for power control, and the like. For example, DCI format 1_1, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

-Carrier indicator: indicates which frequency carrier is transmitted.

-DCI format indicator: It is an indicator to distinguish whether the corresponding DCI is for downlink or uplink.

-Bandwidth part (BWP) indicator: indicates which BWP is transmitted.

-Frequency domain resource allocation: indicates the RB of the frequency domain allocated for data transmission. The resources to be expressed are determined according to the system bandwidth and resource allocation method.

-Time-domain resource allocation: Indicate which OFDM symbol of which slot and which data-related channel is to be transmitted.

-VRB-to-PRB mapping: indicates how to map the virtual RB (virtual RB) index and the physical RB (PRB) index.

-Modulation and coding scheme (MCS): indicates the modulation scheme and coding rate used for data transmission. That is, it is possible to indicate a coding rate value that can inform transport block size (TBS) and channel coding information together with information on whether it is QPSK, 16QAM, 64QAM, or 256QAM.

-CBG transmission information (Codeblock group transmission information): When CBG unit retransmission is set, indicates information about which CBG is transmitted.

-HARQ process number (HARQ process number): indicates the process number of the HARQ.

-New data indicator (New data indicator): indicates whether the HARQ initial transmission or retransmission.

-Redundancy version: indicates a redundancy version of HARQ.

-Transmit Power Control (TPC) command for PUCCH for Physical Uplink Control CHannel (PUCCH): Instructs a transmit power control command for PUCCH, an uplink control channel.

In the case of PDSCH transmission, the time domain resource assignment may be transmitted by information on a slot in which the PDSCH is transmitted and the number of symbols L in which the starting symbol position S and the PDSCH in the corresponding slot are mapped. In the above, S may be a relative position from the start of the slot, L may be the number of consecutive symbols, and S and L may be determined from a start and length indicator value (SLIV) defined as follows. have.

thenif

then

else

where

In the NR system, in general, through the RRC configuration, the UE may set a table including SLIV values in one row, PDSCH or PUSCH mapping type, and information on a slot in which the PDSCH or PUSCH is transmitted. Thereafter, the base station transmits information on the SLIV value, the PDSCH or PUSCH mapping type, the PDSCH or the slot through which the PUSCH is transmitted, by indicating the index value in the set table for the time domain resource allocation of the DCI. You can.

In the NR system, type A (type A) and type B (type B) are defined as PDSCH or PUSCH mapping types. In the PDSCH or PUSCH mapping type A, the first symbol of the DMRS symbol is located in the second or third OFDM symbol in the slot, and the PDSCH or PUSCH mapping type B is among the DMRS symbols in the first OFDM symbol of the time domain resource allocated by PUSCH transmission. The first symbol is located.

The DCI may be transmitted on a physical downlink control channel (PDCCH) which is a downlink physical control channel through channel coding and modulation. In general, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) independently for each UE, CRC (cyclic redundancy check) bits are added and channel-coded, and each channel is composed of independent PDCCHs and then transmitted. The PDCCH is transmitted by being mapped in a control resource set (CORESET) set for the terminal.

The downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH may be transmitted after the control resource set, and scheduling information such as a specific mapping position and modulation method in time and frequency domains is determined based on DCI transmitted through the PDCCH.

Among the control information constituting the DCI, the base station notifies the UE of the modulation scheme applied to the PDSCH to be transmitted and the size of the data to be transmitted (TBS). In an embodiment, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to the size before the channel coding for error correction is applied to data (transport block, transport block, TB) that the base station wants to transmit.

In the present invention, a transport block (TB) refers to a medium access control (MAC) header, a MAC control element (CE), one or more MAC service data units (SDUs), and padding bits. It can contain. Alternatively, the TB may refer to a unit of data or a MAC protocol data unit (PDU) transferred from the MAC layer to the physical layer.

The modulation schemes supported by the NR system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM, and each modulation order (Q _m ) corresponds to 2, 4, 6, and 8 do. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, 6 bits per symbol for 64QAM modulation, and 8 bits per symbol for 256QAM modulation.

2 and 3 are diagrams showing an example in which eMBB, URLLC, and mMTC data, which are services considered in a 5G or NR system, are allocated in a frequency-time resource.

2 and 3, it is possible to see how frequency and time resources are allocated for information transmission in each system. 2 shows an example in which eMBB, URLLC, and mMTC data are allocated in the entire system frequency band 200. When the eMBB data 201 and the mMTC data 209 are allocated and transmitted in a specific frequency band, and URLLC data 203, 205, and 207 occur during transmission, the transmitter needs to transmit the eMBB data 201 and mMTC data 209 ) May be empty, or URLLC data 203, 205, and 207 may be transmitted without transmitting. Since URLLC is required to reduce the delay time among the above services, URLLC data 203, 205, and 207 may be allocated and transmitted to a portion of the resource to which eMBB data 201 is allocated. Of course, when the URLLC data is additionally allocated and transmitted from the resource to which the eMBB data is allocated, the eMBB data may not be transmitted from the overlapped frequency-time resource, and thus the transmission performance of the eMBB data may be lowered. That is, eMBB data transmission failure due to URLLC allocation may occur in the above case.

FIG. 3 shows an example of dividing the entire system frequency band 300 into subbands 302, 304, and 306, and using each subband for the purpose of transmitting services and data. Information related to the subband setting may be determined in advance, and this information may be transmitted by the base station to the terminal through higher level signaling. Alternatively, the information related to the sub-band may be randomly divided by a base station or a network node to provide services to the terminal without transmitting additional sub-band configuration information. In FIG. 3, the subband 302 shows eMBB data 308 transmission, the subband 304 transmits URLLC data 310, 312, and 314, and the subband 306 shows the state used for the transmission of mMTC data 316.

Throughout the embodiment, the length of the transmission time interval (TTI) used for URLLC transmission may be shorter than the length of the TTI used for eMBB or mMTC transmission. In addition, the response of URLLC-related information can be transmitted faster than eMBB or mMTC, and accordingly, information can be transmitted and received with a low delay. The structure of a physical layer channel used for each type to transmit the three services or data may be different. For example, at least one of a length of a transmission time period (TTI), an allocation unit of frequency resources, a structure of a control channel, and a mapping method of data may be different.

Although three services and three data are described above, more types of services and corresponding data may exist, and in this case, the contents of the present invention may be applied.

4 is a diagram illustrating a process in which one transport block is divided into several code blocks and CRC is added.

Referring to FIG. 4, a CRC 403 may be added to the last or front part of one transport block 401 to be transmitted in uplink or downlink. The CRC may have 16 bits or 24 bits, a predetermined number of bits, or a variable number of bits according to a channel condition, and may be used to determine whether channel coding is successful. Blocks 401 and 403 in which CRC is added to the TB may be divided into several code blocks (codeblock, CB, (407, 409, 411, and 413)) (405) .The code block may be divided by a predetermined maximum size. In this case, the last code block 413 may be smaller in size than other code blocks or may be set to have the same length as other code blocks by putting 0, a random value, or 1. CRC for each of the divided code blocks. Fields 417, 419, 421, and 423 may be added 415. The CRC may have 16 bits or 24 bits or a predetermined number of bits, and may be used to determine whether channel coding is successful. have.

에 대해, CRC

는

를 상기 g_CRC24A(D)로 나누어 나머지가 0이 되는 값으로

를 결정할 수 있다. 상기에서 CRC 길이 L이 24인 일례를 설명하였지만 상기 길이는 12, 16, 24, 32, 40, 48, 64 등 여러 가지 길이로 결정될 수 있다. TB 401 and a cyclic generator polynomial may be used to generate the CRC 403, and the cyclic generator polynomial may be defined in various ways. For example, cyclic generation polynomial for 24-bit CRC g _CRC24A (D) = D ²⁴ + D ²³ + D ¹⁸ + D ¹⁷ + D ¹⁴ + D ¹¹ + D ¹⁰ + D ⁷ + D ⁶ + D ⁵ + D ⁴ Assuming + D ³ + D + 1, and L = 24, TB data

About, CRC

The

_Divide by g _CRC24A (D), and the remainder becomes 0.

Can decide. Although an example in which the CRC length L is 24 has been described above, the length can be determined in various lengths such as 12, 16, 24, 32, 40, 48, and 64.

After adding CRC to TB in the above process, the transmitter divides into N CBs (407, 409, 411, 413) (405). CRCs 417, 419, 421, and 423 are added to the divided CBs 407, 409, 411, and 413 (415). The CRC added to the CB may use a CRC of a different length than when generating the CRC added to the TB or another cyclic generation polynomial. However, the CRC 403 added to the TB and the CRCs added to the code block (417, 419, 421, 423) may be omitted depending on the type of channel code to be applied to the code block. For example, when a low-density parity-check (LDPC) code is applied to a code block rather than a turbo code, CRCs 417, 419, 421, and 423 to be inserted for each code block may be omitted. However, even when LDPC is applied, CRCs 417, 419, 421, and 423 may be added to the code block as it is. Also, even when a Polar code is used, CRC may be added or omitted.

As shown in FIG. 4, the maximum length of one code block is determined according to the type of channel coding applied to the TB to be transmitted, and the CRC added to TB and TB according to the maximum length of the code block is a code block Is divided into. In a conventional LTE system, a CRC for a CB is added to the divided CB, and data bits and CRC of the CB are encoded with a channel code to determine coded bits, and for each coded bit in advance As promised, the number of rate matched bits is determined.

The following embodiments provide a method and apparatus for performing data transmission and reception between a base station and a terminal or terminal. This may be the case where data is transmitted from one terminal to a plurality of terminals, or may be a case where data is transmitted from one terminal to one terminal. Or it may be a case where data is transmitted from a base station to a plurality of terminals. However, the present invention may be applied in various cases without being limited thereto.

FIG. 5 is a diagram illustrating an example of groupcasting (511) in which one terminal 501 transmits common data to a plurality of terminals (503, 505, 507, 509). The terminal may be a mobile terminal such as a vehicle. For the group casting, transmission of separate control information, physical control channels, and data may be performed.

FIG. 6 is a diagram illustrating a process in which terminals 603, 605, 607, and 609, which have received common data through group casting, transmit information related to data reception success or failure to the terminal 601 that has transmitted data. . The information may be information such as HARQ-ACK feedback (611). In addition, the terminals may be LTE-based sidelinks or NR-based sidelinks. If the terminal has only the LTE-based sidelink function, transmission and reception of the NR-based sidelink signal and physical channel will be impossible. In the present invention, the side link can be used in combination with PC5 or V2X or D2D. 5 and 6 illustrate an example of transmission and reception according to group casting, but this can also be applied to transmission and reception of a unicast signal between the terminal and the terminal.

7 is a diagram illustrating a mapped state in a frequency and time domain of a synchronization signal and a physical broadcast channel (PBCH) of an NR system. The primary synchronization signal (PSS, 701), the secondary synchronization signal (secondary synchronization signal, SSS, 703), and the PBCH 705 are mapped over 4 OFDM symbols, and the PSS and SSS are mapped to 12 RBs. , PBCH is mapped to 20 RBs. The table of FIG. 7 shows how the frequency bands of 20 RBs change according to subcarrier spacing (SCS). The resource region through which the PSS, SSS, and PBCH are transmitted may be referred to as an SS / PBCH block.

8 is a diagram illustrating which symbols are mapped to one SS / PBCH block in a slot. It shows an example of a conventional LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz, and avoids cell-specific reference signals (CRSs) that are always transmitted in the LTE system. It is designed to transmit SS / PBCH blocks 811, 813, 815, 817 of the NR system at the locations 801, 803, 805, 807. This may be to allow the LTE system and the NR system to coexist in one frequency band.

9 is a view showing the SS / PBCH block to which of the symbols within 1 ms can be transmitted according to the subcarrier interval, and FIG. 10 shows the SS / PBCH block transmitted to which slot and which symbols are within 5 ms. This is a diagram showing whether it can be done according to the subcarrier interval. In the area where the SS / PBCH block can be transmitted, the SS / PBCH block does not always have to be transmitted, and depending on the selection of the base station, the SS / PBCH block may or may not be transmitted.

[First Embodiment]

The first embodiment relates to a method and apparatus for receiving a groupcast data and transmitting feedback to a terminal configured to report feedback. The first embodiment will be described with reference to FIGS. 11 and 12.

The terminal may be configured to receive the control channel and data channel for groupcast from the transmitting end A, and to receive the control channel and data channel for unicast from the transmitting end B. In this embodiment, the transmitting end A and the transmitting end B may be the same transmitting end, or may be different transmitting ends. In the present invention, the transmitting terminal A and the transmitting terminal B may be base stations, or may be vehicles or general terminals. When the transmitting end is a base station, the groupcast and unicast data transmission may be transmitted from the base station, that is, transmitted through a Uu link. In the case where the transmitting end is a vehicle or a general terminal, the groupcast and unicast transmission may be sidelink transmission. At this time, the transmitting end is a terminal called a leader node or an anchor node in the group, and can perform groupcast transmission to other terminals in the group and perform a function of receiving control information from other terminals. It can be a terminal. In addition, in the present embodiment, it is possible that the transmitting end A is a vehicle and the transmitting end B is modified and applied as in the case of a base station. This embodiment is described on the assumption that the transmitting end A and the transmitting end B are one transmitting end, but may be modified and applied even in the case of different transmitting ends.

For receiving the control channel and data channel for the groupcast, the UE receives an RNTI value corresponding to a unique ID (hereinafter, a group RNTI (group RNTI, G-RNTI) or a group common RNTI, mixed with a group identifier, etc.) or a base station or group It can be delivered from my other terminal (which can be a leader node). The terminal may receive a control channel for groupcast by using the G-RNTI value, and receive a data channel based thereon. In this embodiment, the control channel for data scheduling is mixed with a physical downlink control channel (PDCCH) or a physical sidelink control channel (PSCCH), and the data channel is mixed with a physical downlink shared channel (PDSCH) or a physical sidelink shared channel (PSSCH). The feedback channel may be mixed with a physical uplink control channel (PUCCH) or PSCCH. In addition, control information for scheduling received by the terminal is hereinafter described as DCI, but this may be called differently.

The transmitting end may set a resource for transmitting HARQ-ACK feedback of data transmitted in a group cast to the terminal. FIG. 11 is a diagram illustrating an example in which terminals receiving groupcast data transmit feedback to the same frequency-time resource. The resource may be configured for each terminal using RRC signaling or / and DCI. Each terminal receives data from the transmitting end, decodes the data, reports HARQ-ACK feedback information indicating the result of receiving the data to the transmitting end through a feedback channel, and the example of FIG. 11 shows that all terminals have feedback information in the same resource. This is an example of reporting.

은

에 의해 정의될 수 있으며,

의 값

은 하기의 수학식으로 정의될 수 있다. The feedback channel in which each terminal of FIG. 11 reports feedback information may be a method using a specific sequence, and the sequence may be a Zadoff-Chu sequence. For example

silver

Can be defined by

The value of

Can be defined by the following equation.

로 결정될 수 있다. 상기 수식에서

는 라디오 프레임에서의 슬롯 번호이며, l은 피드백 채널이 매핑되는 OFDM 심볼 번호이며, 따라서 l 는 피드백 채널이 매핑되는 첫 번째 심볼을 의미한다. m₀은 상위 계층 시그널링에 의해 단말에게 설정된 값일 수 있으며, HARQ-ACK 피드백 정보는 상기 수식에서 m_cs 값으로 전달될 수 있다. 예를 들어 1비트의 HARQ-ACK 피드백을 전달하는 경우, HARQ-ACK 값이 0이면 (즉 NACK이면), m_cs를 0으로 결정하고, HARQ-ACK 값이 1이면 (즉 ACK이면), m_cs를 6로 결정한다. 다른 일례로, 2비트의 HARQ-ACK 피드백을 전달하는 경우는, 2비트의 HARQ-ACK의 조합이 {0,0}이면 m_cs를 0으로 결정하고, HARQ-ACK의 조합이 {0,1}이면 m_cs를 3으로 결정하고, HARQ-ACK의 조합이 {1,1}이면 m_cs를 6으로 결정하고, HARQ-ACK의 조합이 {1,0}이면 m_cs를 9로 결정할 수 있다. In the above, the length of the sequence is M _ZC , and N _ZC may be defined as the largest prime number among the numbers smaller than M _ZC . In the above, α may mean a cyclic shift, for example,

Can be determined as. In the above formula

Is a slot number in a radio frame, l is an OFDM symbol number to which a feedback channel is mapped, and l is a first symbol to which a feedback channel is mapped. m ₀ may be a value set to the terminal by higher layer signaling, and HARQ-ACK feedback information may be transmitted as an m _cs value in the above formula. For example, when 1-bit HARQ-ACK feedback is transmitted, if the HARQ-ACK value is 0 (that is, NACK), m _cs is determined to be 0, and if the HARQ-ACK value is 1 (that is, if it is ACK), m Determine _cs to be 6. As another example, when transmitting 2 bits of HARQ-ACK feedback, if the combination of 2 bits of HARQ-ACK is {0,0}, m _cs is determined to be 0, and the combination of HARQ-ACK is {0,1 If it is}, m _cs is determined as 3, if the combination of HARQ-ACKs is {1,1}, m _cs is determined as 6, and when the combination of HARQ-ACKs is {1,0}, m _cs is determined as 9. .

When the HARQ-ACK information is received, the transmitting end may retransmit the groupcast data when the NACK transmitted by the terminal receiving the groupcast data is received.

Another example in which terminals belonging to the same group transmit HARQ-ACK feedback on the same frequency-time resource for groupcast data transmission is as follows. The UE receives two frequency-time resources, one of which is used for feedback transmission when HARQ-ACK is ACK, that is, when data transmission is successful, and the other when HARQ-ACK is NACK, that is, data Can be used to send feedback when transmission fails. For example, the transmitting end sets specific frequency-time resources A and B to terminals belonging to the group, and when the data HARQ-ACK value is 1, the terminal transmits a feedback signal from the frequency-time resource A. On the other hand, if the data HARQ-ACK value is 0, the UE transmits a feedback signal in the frequency-time resource B. The transmitted feedback signal may be a signal made based on a specific sequence, and specifically, the above-described sequence may be used.

12 is a diagram illustrating an example in which terminals receiving groupcast data transmit feedback to different frequency-time resources. The resource may be configured for each terminal using RRC signaling or / and DCI. The UE may determine the number of HARQ-ACK bits from the union of the unicast PDSCH mapping allocation table and the multicast PDSCH mapping allocation table.

The base station may set one component carrier (CC) or multiple component carriers for downlink transmission to the terminal. In addition, downlink transmission and uplink transmission slots and symbols may be set in each CC. Meanwhile, when PDSCH, which is downlink data, is scheduled, slot timing information to which a PDSCH is mapped in a specific bit field of DCI, and information of a start symbol position to which a PDSCH is mapped and a number of symbols to which a PDSCH is mapped are transmitted in a corresponding slot. For example, when DCI is delivered in slot n and the PDSCH is scheduled, when the slot timing information K0, which is the PDSCH is transmitted, indicates 0, and the start symbol position is 0 and the symbol length is 7, the corresponding PDSCH is slot n It is transmitted after being mapped to 7 symbols from symbol 0 of. The time-domain resource setting allows the base station and the terminal to understand the starting symbol and length information in a specific slot as a table, and to transmit the time-domain resource information by indicating the index value of the table using the DCI to the terminal. It is done in a way. The above table uses a fixed value or, if it is set by higher level signaling, a set value. Table 3 below may be an example of a table including slot information, start symbol information, symbol number or length information to which the PDSCH is mapped.

Row index dmrs-TypeA-Position PDSCH mapping type K _{0 S L One 2 Type A 0 2 12 3 Type A 0 3 11 2 2 Type A 0 2 10 3 Type A 0 3 9 3 2 Type A 0 2 9 3 Type A 0 3 8 4 2 Type A 0 2 7 3 Type A 0 3 6 5 2 Type A 0 2 5 3 Type A 0 3 4 6 2 Type B 0 9 4 3 Type B 0 10 4 7 2 Type B 0 4 4 3 Type B 0 6 4 8 2,3 Type B 0 5 7 9 2,3 Type B 0 5 2 10 2,3 Type B 0 9 2 11 2,3 Type B 0 12 2 12 2,3 Type A 0 One 13 13 2,3 Type A 0 One 6 14 2,3 Type A 0 2 4 15 2,3 Type B 0 4 7 16 2,3 Type B 0 8 4}

According to Table 3, under the assumption that two PDSCHs cannot be mapped to the same OFDM symbol, up to three PDSCHs can be allocated to one slot. For example, Table 3 may be a table for unicast PDSCH resource allocation to a specific terminal, and a separate table, for example, a table as shown in Table 4 below, may be used for groupcast PDSCH resource allocation.

Row index dmrs-TypeA-Position PDSCH mapping type K _{0 S L One 2 Type A 0 2 6 3 Type A 0 3 5 2 2 Type A 0 2 10 3 Type A 0 3 9 3 2 Type A 0 2 9 3 Type A 0 3 8 4 2 Type A 0 2 7 3 Type A 0 3 6 5 2 Type A 0 2 5 3 Type A 0 3 4 6 2 Type B 0 6 4 3 Type B 0 8 2 7 2 Type B 0 4 4 3 Type B 0 6 4 8 2,3 Type B 0 5 6 9 2,3 Type B 0 5 2 10 2,3 Type B 0 9 2 11 2,3 Type B 0 10 2 12 2,3 Type A 0 One 11 13 2,3 Type A 0 One 6 14 2,3 Type A 0 2 4 15 2,3 Type B 0 4 6 16 2,3 Type B 0 8 4}

Under the assumption that two PDSCHs cannot be mapped to the same OFDM symbol, according to Table 4, up to three PDSCHs can be allocated to one slot.

On the other hand, the downlink data signal PDSCH is transmitted and HARQ-ACK feedback is transmitted from the terminal to the base station after the K1 slot. K1 information, which is timing information on which the HARQ-ACK is transmitted, is transmitted in DCI, and a candidate set of K1 values possible by higher signaling is transmitted and may be determined as one of the candidate sets in DCI.

The terminal collects and transmits HARQ-ACK feedback bits in order to transmit HARQ-ACK information to the base station. In the following, the collected HARQ-ACK feedback bits may be referred to as a mixture of HARQ-ACK codebooks. The base station transmits the HARQ-ACK feedback bits corresponding to the PDSCH that can be transmitted in slots and symbol positions of a predetermined timing regardless of whether the actual PDSCH is transmitted to the UE or not (semi-static HARQ-) ACK codebook). Alternatively, a dynamic HARQ-ACK codebook may be configured to transmit only HARQ-ACK feedback bits corresponding to the actually transmitted PDSCH. In this case, the UE includes a counter DAI (downlink assignment) included in DCI. index) or a total DAI to determine a feedback bit.

When the UE receives the semi-static HARQ-ACK codebook, the UE is a table (or slot information, start symbol information and symbol number according to the table) including slot information, start symbol information, symbol number or length information to which the PDSCH is mapped. Or length information) and K1 candidate values, which are HARQ-ACK feedback timing information for the PDSCH, determine a feedback bit to be transmitted. The table including the slot information, the start symbol information, the number of symbols or the length information to which the PDSCH is mapped may have a table according to a default value, and there may also be a table that the base station can set for the terminal. In addition, K1 candidate values, which are HARQ-ACK feedback timing information for PDSCH, may be determined as a default value, for example, {1,2,3,4,5,6,7,8}, and a base station or a transmitting end may have a higher layer The set of K1 candidate values can be set by signaling. For example, a set of K1 candidate values may be set to {2,4,6,8,10,12,14,16}, and one of them may be indicated as DCI.

A method for configuring a HARQ-ACK codebook when a specific terminal is configured from a base station or another terminal in a group to receive a unicast PDSCH and a groupcast PDSCH, and is configured to use a semi-static HARQ-ACK codebook for HARQ-ACK feedback transmission Provided below. In the above, another terminal in the group that sets such information to the corresponding terminal may be a leader node of the corresponding group.

A terminal for transmitting the HARQ-ACK feedback is a set of (occasion for candidates PDSCH receptions) when PDSCH reception candidate serving cell c M _{A, c} If to the same [pseudo-code 1] to the step M _A, called _c I can get it. M _{A, c} may be used to determine the number of HARQ-ACK bits to be transmitted by the UE. Specifically, the HARQ-ACK codebook may be configured using the cardinality of the M _{A, c} set.

[Start pseudo-code 1]

-Step 1: Initialize j to 0 and M _{A, c} to the empty set. Initialize k, the HARQ codebook index, to 0.

-Step 2: A set of group and PDSCH PDSCH candidates indicated by each row in a table (for example, Table 3) containing R slot information, start symbol information, symbol number or length information to which unicast PDSCH can be mapped Set to a union of a set of PDSCH candidates indicated by each row in a table (for example, Table 4) including slot information, start symbol information, symbol number, or length information that can be mapped. If the symbol used for PDSCH mapping indicated by each value of R is set as the UL symbol according to the DL and UL settings of each symbol set as higher layer signaling, the corresponding row is deleted from R. In this embodiment, the possible resource allocation of the unicast PDSCH and the groupcast PDSCH can be determined based on a table having differently configured PDSCH reception candidates. As an example, resource allocation may be determined based on Table 3 for unicast PDSCH, and resource allocation may be determined based on Table 4 for groupcast PDSCH.

-Step 3-1: If the UE can receive one PDSCH in one slot, and R is not empty _, add k to the set M _{A, c} .

-Step 3-2: If the UE can receive more than one PDSCH in one slot, count the number of unicast or groupcast PDSCHs that can be allocated to different symbols in the calculated R, and M _{A, c} as much as the corresponding number. Added to. This step is performed under the assumption that PDSCHs of unicast and groupcast cannot be received by being mapped together to the same OFDM symbol. That is, this is a step of determining how many unicast or groupcast PDSCHs can be received in one slot and adding the corresponding number to M _{A, c} .

-Step 4: Start again from step 2 by increasing k by 1.

[end of pseudo-code 1]

The pseudo-code may be a method of calculating how many unicast and multicast PDSCHs can be mapped to one slot in consideration of a set of unicast PDSCH mappable and multicast PDSCH mappable sets.

The above steps can be executed with the following [pseudo-code 2].

[Start pseudo-code 2]

, the UE determines

occasions for candidate PDSCH receptions or SPS PDSCH releases according to the following pseudo-code. For the set of slot timing values

, the UE determines

occasions for candidate PDSCH receptions or SPS PDSCH releases according to the following pseudo-code.

- index of occasion for candidate PDSCH reception or SPS PDSCH releaseSet

-index of occasion for candidate PDSCH reception or SPS PDSCH release

Set

Set

to the cardinality of set

Set

to the cardinality of set

in set

for serving cell

Set k = 0-index of slot timing values

in set

for serving cell

while

to the set of rows provided by the union of PDSCH-TimeDomainResourceAllocation_unicast and PDSCH-TimeDomainResourceAllocation_groupcast Set

to the set of rows provided by the union of PDSCH-TimeDomainResourceAllocation_unicast and PDSCH-TimeDomainResourceAllocation_groupcast

(In the above, PDSCH-TimeDomainResourceAllocation_unicast is a value set for a table having a unicast PDSCH reception candidate, and PDSCH-TimeDomainResourceAllocation_groupcast is a value set for a table having a groupcast PDSCH reception candidate)

to the cardinality of

, Set

to the cardinality of

,

- index of row provided by the union of PDSCH-TimeDomainResourceAllocation_unicast and PDSCH-TimeDomainResourceAllocation_groupcast Set

-index of row provided by the union of PDSCH-TimeDomainResourceAllocation_unicast and PDSCH-TimeDomainResourceAllocation_groupcast

is after a slot for an active DL BWP change on serving cell

or an active UL BWP change on the PCell and slot

is before the slot for the active DL BWP change on serving cell

or the active UL BWP change on the PCell if slot

is after a slot for an active DL BWP change on serving cell

or an active UL BWP change on the PCell and slot

is before the slot for the active DL BWP change on serving cell

or the active UL BWP change on the PCell

;

;

else

while

to slot

, at least one OFDM symbol of the PDSCH time resource derived by row

is configured as UL where

is the k-th slot timing value in set

, if the UE is provided higher layer parameter tdd-UL-DL-ConfigurationCommon , or higher layer parameter tdd-UL-DL- ConfigurationCommon2 , or higher layer parameter tdd-UL-DL-ConfigDedicated and, for each slot from slot

to slot

, at least one OFDM symbol of the PDSCH time resource derived by row

is configured as UL where

is the k -th slot timing value in set

,

;

;

end if

;

;

end while

, If the UE does not indicate a capability to receive more than one unicast PDSCH per slot and

,

The UE does not expect to receive SPS PDSCH release and unicast PDSCH in a same slot;

else

to the cardinality of

Set

to the cardinality of

to the smallest last OFDM symbol index, as determined by the SLIV, among all rows of

Set

to the smallest last OFDM symbol index, as determined by the SLIV , among all rows of

while

Set

while

for start OFDM symbol index

for row

if

for start OFDM symbol index

for row

; - index of occasion for candidate PDSCH reception or SPS PDSCH release associated with row

; -index of occasion for candidate PDSCH reception or SPS PDSCH release associated with row

;

;

end if

;

;

end while

;

;

to the smallest last OFDM symbol index among all rows of

;Set

to the smallest last OFDM symbol index among all rows of

;

end while

end if

;

;

end if

end while

[end of pseudo-code 2]

The pseudo-code 1 and pseudo-code 2 may be a method assuming that the unicast PDSCH and the multicast PDSCH are mapped to the same OFDM symbol and are not transmitted.

On the other hand, when the unicast PDSCH and the multicast PDSCH can be transmitted by being mapped to the same OFDM symbol, the UE configures the HARQ-ACK codebook for the unicast PDSCH (which can be called HARQ-ACK_codebook_unicast), and the groupcast. The HARQ-ACK codebook for the PDSCH is separately configured (can be referred to as HARQ-ACK_codebook_groupcast). The unicast PDSCH HARQ-ACK codebook and the groupcast PDSCH HARQ-ACK codebook may be configured based on different tables, for example, based on Tables 3 and 4, respectively. The terminal configures each HARQ-ACK codebook as described above, connects two codebooks, connects them, and encodes them before transmitting. In this case, the unicast HARQ-ACK codebook and the groupcast HARQ-ACK codebook may be concatenated, or the groupcast HARQ-ACK codebook and the unicast HARQ-ACK codebook may be concatenated, but are not limited thereto.

Specifically, the terminal may configure the HARQ-ACK codebook through the following process. The UE is a K1 candidate value that is a table including slot information, start symbol information, symbol number or length information, and HARQ feedback timing information to which PDSCH is mapped from a transmitting end (which may be a base station or another UE in a group) to higher layer signaling. Is set. In this case, the table for the groupcast and the table for unicast may be set differently. Thereafter, the terminal receives scheduling information for groupcast data transmission and scheduling information for unicast data transmission from the transmitting end. In this case, scheduling information for groupcast data transmission may be related to G-RNTI. The scheduling information may be referred to as DCI, and the DCI may include a bit field indicating an index value of one of the tables to deliver resource allocation information and one of K1 candidate values to convey HARQ-ACK feedback timing information. It may include a bit field indicating. Alternatively, one of the index value and / or the K1 candidate value may be indicated to the UE by other methods such as higher layer signaling or predetermined.

The terminal that has received the groupcast data and the unicast data according to the scheduling information checks the result of the groupcast data and the unicast data to configure the HARQ-ACK codebook. At this time _, M _{A, c} can be obtained by using the pseudo-code 1 or pseudo-code 2, or the entire HARQ-ACK codebook is configured by concatenating the unicast PDSCH HARQ-ACK codebook and the groupcast PDSCH HARQ-ACK codebook. can do. The terminal encodes the configured HARQ-ACK codebook and transmits it to the transmitting end on the set resource. After the HARQ-ACK codebook signal is transmitted, the UE may receive retransmitted groupcast data or / and unicast data from the transmitting end when the HARQ-ACK codebook indicates that the data has not been received.

[Example 1-1]

Embodiment 1-1 provides a method for determining a priority and transmitting HARQ-ACK feedback when a UE needs to simultaneously transmit HARQ-ACK feedback for unicast data and HARQ-ACK feedback for groupcast data. .

When a terminal receives downlink or sidelink control information and data and accordingly attempts to transmit each feedback signal to a base station or another terminal, it may be necessary to simultaneously transmit feedback for unicast data and feedback for groupcast data. Can occur. At this time, the terminal may perform some of the following methods. In this embodiment, unicast HARQ-ACK feedback may mean HARQ-ACK feedback for unicast data, and groupcast HARQ-ACK feedback may mean HARQ-ACK feedback for groupcast data. You can.

- Method 1: If the UE is configured or scheduled to simultaneously transmit unicast HARQ-ACK feedback and groupcast HARQ-ACK feedback, the groupcast HARQ-ACK feedback is not transmitted, but only the unicast HARQ-ACK feedback is transmitted.

- Method 2: If the UE is configured or scheduled to simultaneously transmit unicast HARQ-ACK feedback and groupcast HARQ-ACK feedback, unicast HARQ-ACK feedback is not transmitted, but only groupcast HARQ-ACK feedback is transmitted.

- Method 3: If the UE is configured or scheduled to simultaneously transmit unicast channel state information (CSI) feedback and groupcast HARQ-ACK feedback, the UE does not transmit unicast CSI feedback and does not transmit groupcast HARQ-ACK Send only feedback. This may be to prioritize HARQ-ACK feedback information over CSI reporting.

- Method 4: If the UE is configured or scheduled to simultaneously transmit the groupcast CSI feedback and the unicast HARQ-ACK feedback, the UE does not transmit the groupcast CSI feedback but only the unicast HARQ-ACK feedback. This may be to prioritize HARQ-ACK feedback information over CSI reporting.

- Method 5: When the UE attempts to transmit a scheduling request (SR) for unicast data transmission, if it is configured or scheduled to transmit groupcast HARQ-ACK or CSI feedback, the UE performs groupcast HARQ-ACK or CSI The SR for unicast data transmission is transmitted without transmitting feedback.

- Method 6: When the UE tries to transmit a scheduling request (SR) for unicast data transmission, if it is configured or scheduled to transmit groupcast HARQ-ACK or CSI feedback, the SR for unicast data transmission is not transmitted, Groupcast HARQ-ACK or CSI feedback is transmitted.

- Method 7: When the UE needs to simultaneously transmit HARQ-ACK for the sidelink unicast PSSCH (unicast data) and HARQ-ACK for the groupcast PSSCH (groupcast data), the UE performs some information according to the above detailed methods. You will be able to decide whether to send.

Method 7-1: This method is a method of determining which HARQ-ACK information is transmitted first based on the QoS value set in the resource pool to which the PSSCH is mapped. For example, QoS may be a parameter related to Priority or Latency, but may be applied without being limited thereto.

For example, if the priority set in the resource pool in which the unicast PSSCH is transmitted is 1 and the priority set in the resource pool in which the group cast PSSCH is transmitted is 4, the UE performs HARQ-ACK and sidecast PSSCH for the sidelink unicast PSSCH. When the HARQ-ACK for is simultaneously scheduled, the UE always transmits the HARQ-ACK for the unicast PSSCH. In the above method, it is assumed that Priority 1 has a higher priority than Priority 4, and of course, it may be applied differently depending on which value has a higher priority. In addition, in the above method, the Priority value corresponding to the unicast and the Priority value corresponding to the group cast are compared in the same way, but it may be possible to compare after adding or subtracting an offset value to any one. For example, in the case of unicast, if an offset of -2 is applied, and the priority set in the resource pool in which the unicast PSSCH is transmitted is 1, and the priority set in the resource pool in which the groupcast PSSCH is transmitted is 2, the UE is configured for the groupcast PSSCH. HARQ-ACK can be transmitted.

Method 7-2: This method is a method of determining which HARQ-ACK information is transmitted first based on QoS values included in sidelink control information (SCI) for scheduling PSSCH. For example, QoS may be a parameter related to Priority or Latency, but may be applied without being limited thereto. For example, if the Priority value included in the SCI scheduling the unicast PSSCH is 1 and the Priority included in the SCI scheduling the groupcast PSSCH is 4, the UE performs HARQ-ACK and groupcast for the sidelink unicast PSSCH. When the HARQ-ACK for the PSSCH is scheduled to be transmitted simultaneously, the UE always transmits the HARQ-ACK for the unicast PSSCH. In the above method, it is assumed that Priority 1 has a higher priority than Priority 4, and of course, it may be applied differently depending on which value has higher priority. In addition, in the above method, the Priority value corresponding to the unicast and the Priority value corresponding to the group cast are compared in the same way, but it may be possible to compare after adding or subtracting an offset value to any one. For example, in the case of unicast, if the offset of -2 is applied, the priority value included in the SCI scheduling unicast PSSCH is 1, and the priority value included in the SCI scheduling the groupcast PSSCH is 2, the UE performs the groupcast PSSCH. HARQ-ACK for can be transmitted.

Method 7-3: This method is based on channel sensing performed to transmit HARQ-ACK for a sidelink unicast PSSCH and channel sensing performed to transmit HARQ-ACK for a groupcast PSSCH. This is a method of determining whether to transmit ACK information first. The channel sensing may be a method of determining whether or not a corresponding resource is occupied by another terminal with respect to a resource for transmission, or may be a method of determining a possibility of collision of the corresponding resource. This can be done by measuring the received energy, such as the Listen-before-Talk (LBT) method, or in the process of decoding SCIs, or a combination of the two methods. Or, it may be performed based on the calculated value of how much the corresponding resource such as Channel Busy Ratio (CBR) was occupied in the past.

By performing the channel sensing as described above, the UE has a resource for transmitting HARQ-ACK for a sidelink unicast PSSCH and a probability for occupying a resource for transmitting HARQ-ACK for a sidelink groupcast PSSCH or another UE. The probability of a collision occurring is calculated, and the terminal identifies a resource that is not occupied or likely to have a collision, and transmits HARQ-ACK feedback to be transmitted from the resource. For example, a resource for transmitting HARQ-ACK for a sidelink unicast PSSCH is referred to as resource 1, and a resource for transmitting HARQ-ACK for a sidelink groupcast PSSCH is referred to as resource 2. The received energy level obtained by the terminal performing channel sensing like LBT on resource 1 is called A, and the received energy level obtained by performing channel sensing like LBT on resource 2 is called B. If A> B, since it may mean that the energy of the received signal received from resource 1 is higher, the UE does not transmit unicast HARQ-ACK and transmits groupcast HARQ-ACK from resource 2. This may be to increase the probability of successful transmission by transmitting a small probability that the terminal will collide in transmitting feedback. In this method, the energy level of resource 1 and the energy level of resource 2 are equally compared, but a method of comparing after adding or subtracting an offset value to any one value can also be applied. For example, rather than comparing A and B, rather than adding A and B + offset, offset values are compared. At this time, the offset value may be given in advance, or may be a set value.

This method has been described based on the sidelink, but may be applied to downlink and uplink in the same way. In addition, although the method is described on the assumption of HARQ-ACK feedback, it may be applied to CSI feedback or SR feedback.

One or more of the methods provided above may be applied in combination. As an example, Method 1, Method 3, and Method 5 may be applied together.

The terminal may be set whether to transmit the groupcast and whether to transmit the feedback from the transmitting end. Thereafter, the UE checks whether unicast HARQ-ACK feedback, groupcast HARQ-ACK feedback, and CSI, SR, etc. are configured or scheduled to be transmitted simultaneously. The unicast and groupcast HARQ-ACK feedback time point and the CSI feedback time point may be preset by the transmitting end by higher layer signaling and / or scheduling information. When the unicast HARQ-ACK feedback, groupcast HARQ-ACK feedback and CSI, SR, etc. are set or scheduled to be transmitted simultaneously, the terminal transmits information determined according to at least one of the above-described methods to the transmitting end.

[Second Embodiment]

The second embodiment describes a method in which the terminal divides and uses a soft buffer for data transmission from a base station and data transmission for a side link. This method may be a method in which the HARQ processes that the UE virtually sets or actually has are divided into data transmission for transmission from a base station and data transmission for transmission on a side link. In the present invention, data transmission and reception between a base station and a terminal may be referred to as data transmission and reception through a Uu link.

The terminal accessing the base station reports to the base station that it supports data transmission and reception through the side link in addition to data transmission and reception through the Uu link. The base station is configured to activate sidelink transmission and reception, and transmits configuration information necessary for transmission and reception to the terminal. In addition, the base station sets the number of HARQ processes to be used for data transmission and reception via the Uu link and the number of HARQ processes to be used for data transmission and reception via the side link. The set number of HARQ processes may be a basis for determining bitfield information of an HARQ process indicator to be included in control information for scheduling data.

The terminal determines the size of the soft buffer for data transmission and reception through the Uu link and the size of the soft buffer for data transmission and reception through the sidelink based on the set number of HARQ processes. For example, if the number of HARQ processes for data transmission and reception via the Uu link is set to 8 and the number of HARQ processes for data transmission and reception via the sidelink is set to 4, 8/12 of the total soft buffer of the terminal (about 67%) Is determined to be used for data transmission and reception via the Uu link, and 4/12 (about 33%) of the entire soft buffer may be designated for use for data transmission and reception via the side link.

비트일 수 있다), 사이드링크용 스케줄링을 위한 제어정보에 포함된 HARQ 프로세스 ID값은 0부터 M-1까지의 사이드링크용 HARQ 프로세스 중 하나를 가리키는 정보일 수 있다(이때 제어정보에서 HARQ 프로세스 ID를 지시하기 위해서는

비트일 수 있다). When the HARQ process is divided and used in the above, when the number of HARQ processes for the Uu link and the number of HARQ processes for the sidelink are set to be used, the index value of the HARQ process is 0 to N-1 for the Uu link, sidelink Dragons can be from 0 to M-1. In this case, the HARQ process ID value included in the control information for Uu link scheduling is information indicating one of the HARQ processes for Uu links 0 to N-1 (in order to indicate the HARQ process ID in the control information at this time)

May be a bit), the HARQ process ID value included in the control information for sidelink scheduling may be information indicating one of the HARQ processes for sidelinks from 0 to M-1 (in this case, the HARQ process ID in the control information) In order to instruct

Can be a bit).

비트일 수 있다). As another example, the index value of the HARQ process may be 0 to N-1 for a Uu link and N to N + M-1 for a side link. In this case, the HARQ process ID value included in the control information for Uu link and sidelink scheduling may be information indicating one of all HARQ processes from 0 to N + M-1 (in this case, the HARQ process in the control information) To indicate ID

Can be a bit).

[Example 3]

The third embodiment describes a method in which the terminal divides and uses the soft buffer for unicast data transmission on the sidelink and groupcast data transmission on the sidelink. In this embodiment, unicast means data transmission and reception from one terminal to a specific other terminal, and group cast refers to data transmission and reception from one terminal to terminals belonging to a specific group. This method may be a method in which the HARQ processes that the UE virtually configures or actually has are divided into unicast data transmission and group cast data transmission.

The terminal accessing the base station reports to the base station that it supports group transmission and reception of data in addition to unicast data transmission and reception. The base station is set to activate groupcast data transmission and reception, and transmits configuration information necessary for transmission and reception to the terminal. In addition, the base station sets the number of HARQ processes to be used to transmit and receive unicast data and the number of HARQ processes to be used to transmit and receive groupcast data. The set number of HARQ processes may be a basis for determining bitfield information of an HARQ process indicator to be included in control information for scheduling data. The terminal determines the size of the soft buffer for transmitting and receiving unicast data and the size of the soft buffer for transmitting and receiving groupcast based on the set number of HARQ processes. For example, if the number of HARQ processes for transmitting and receiving unicast data is set to 8, and the number of HARQ processes for transmitting and receiving groupcast data is set to 4, 8/12 (about 67%) of all soft buffers of the terminal are uni It is decided to use for transmitting and receiving cast data, and 4/12 (about 33%) of all soft buffers may be used for transmitting and receiving groupcast data.

비트일 수 있다), 그룹캐스트용 스케줄링을 위한 제어정보에 포함된 HARQ 프로세스 ID값은 0부터 M-1까지의 그룹캐스트용 HARQ 프로세스 중 하나를 가리키는 정보일 수 있다(이때 제어정보에서 HARQ 프로세스 ID를 지시하기 위해서는

비트일 수 있다). When the HARQ process is divided and used, N for unicast and M for groupcast are set, the index value of the HARQ process is from 0 to N-1 for unicast, and from 0 for groupcast. It may be up to M-1. In this case, the HARQ process ID value included in the control information for unicast scheduling is information indicating one of the unicast HARQ processes from 0 to N-1 (in order to indicate the HARQ process ID in the control information at this time)

May be a bit), the HARQ process ID value included in the control information for groupcast scheduling may be information indicating one of the HARQ processes for groupcast from 0 to M-1 (in this case, the HARQ process ID in the control information) In order to instruct

Can be a bit).

비트일 수 있다). As another example, the index value of the HARQ process may be 0 to N-1 for unicast, and N to N + M-1 for groupcast. In this case, the HARQ process ID value included in the control information for unicast and group cast scheduling may be information indicating one of all HARQ processes from 0 to N + M-1 (in this case, the HARQ process ID is used in the control information). To order

Can be a bit).

When one CB is input to the LDPC encoder in the NR system, parity bits may be added and output. At this time, the amount of parity bits may vary according to the LDPC base graph. A method of transmitting all parity bits generated by LDPC coding for a specific input may be called full buffer rate matching (FBRM), and a method of limiting the number of parity bits that can be transmitted is called limited buffer rate matching (LBRM). can do.

When the resource is allocated for data transmission, the LDPC encoder output is made into a circular buffer, and the bits of the created buffer are repeatedly transmitted as much as the allocated resource. At this time, the length of the circular buffer can be called N _cb . If the number of all LDPC codeword bits generated by LDPC coding is N, N _cb = N in the FBRM method. The LDPC codeword bit may include some information word bits for applying LDPC coding.

는

가 되며,

는

로 주어지며,

은 2/3으로 결정될 수 있다. 이 때 C는 해당 TB에 포함된 코드 블록의 개수를 나타내고,

은 전술한 TBS를 구하는 방법에서, 해당 셀에서 단말이 지원하는 최대 레이어 수를 나타내고, 이 때 해당 셀에서 단말에게 설정된 최대 변조 차수 또는 최대 변조 차수가 설정되지 않았을 경우에는 최대 변조 차수로 64QAM(Q_m=6)이 가정되고, 코드레이트(또는 코딩 레이트)는 최대 코드레이트인 948/1024이 가정되며,

는

로 가정되고

는

으로 가정될 수 있다.

는 하기의 표 7로 주어질 수 있다. In the LBRM method,

The

Becomes

The

Is given by

Can be determined as 2/3. At this time, C represents the number of code blocks included in the TB,

In the above-described method for obtaining the TBS, represents the maximum number of layers supported by the terminal in the corresponding cell, and when the maximum modulation order or the maximum modulation order set for the terminal in the corresponding cell is not set, 64QAM (Q _m = 6) is assumed, and the code rate (or coding rate) is assumed to be the maximum code rate 948/1024,

The

As being

The

Can be assumed as

Can be given in Table 7 below.

[Table 7]

x min(1,ceil(16/32))와 같이 재정의될 수 있다. 이는 단말이 HARQ process 수에 따라 수신 동작에서 저장해야 할 정보가 많아지기 때문에, 단말의 저장공간이 제약되어 있음을 고려한 방법일 수 있다. 상기 수식에서 16의 값은 NR 시스템에서 단말이 기지국으로부터 설정 받을 수 있는 HARQ 프로세스의 최대 개수가 16이기 때문일 수 있다. 하지만 본 발명은 특정 값에 한정되지 않고 다른 값을 이용한 수식으로 적용될 수 있을 것이다. 일례로 상기 32는 유니캐스트 또는 그룹캐스트 전송에 대한 최대 HARQ 프로세스 개수의 합일 수 있으며, 이를 일반화하면 유니캐스트 전송에 대한 HARQ 프로세스 개수의 합이 n이고 그룹캐스트 전송에 대한 HARQ 프로세스 개수의 합이 m이라면 상기 16/32는 n/(m+n) 또는 m/(n+m) 으로 표현될 수 있다.In this embodiment, the method of dividing the soft buffer is to redefine N _ref, which is a value required in a limited buffer rate matching (LBRM) process performed when mapping a unicast PDSCH (or PSSCH) and a groupcast PDSCH (or PSSCH). It can be a way. For example, when the sum of HARQ process for unicast and HARQ process for group cast is 32, N _ref is

x min (1, ceil (16/32)). This may be a method considering that the storage space of the terminal is limited because the information to be stored in the reception operation increases according to the number of HARQ processes. The value of 16 in the above formula may be because the maximum number of HARQ processes that the terminal can receive from the base station in the NR system is 16. However, the present invention is not limited to a specific value, but may be applied as a formula using other values. For example, the 32 may be the sum of the maximum number of HARQ processes for unicast or groupcast transmission, and if generalized, the sum of the number of HARQ processes for unicast transmission is n and the sum of the number of HARQ processes for groupcast transmission is m. If 16/32 can be expressed as n / (m + n) or m / (n + m).

In the above embodiments and subsequent embodiments, the unicast PDSCH and the groupcast PDSCH may be distinguished in the process of decoding the DCI scheduling the corresponding PDSCH. For example, when decoding the DCI, the UE checks the RNTI by scrambling or descrambling the CRC in the process of checking the CRC. If the RNTI is the RNTI allocated for unicast transmission, the UE is PDSCH scheduled with the DCI. Is identified as a unicast PDSCH, and if the RNTI is an RNTI allocated for groupcast transmission, the PDSCH scheduled for the DCI may be identified as a groupcast PDSCH. Or, a PDSCH for which a specific bitfield of DCI is scheduled may indicate whether it is for unicast or groupcast.

Similarly, in the above embodiments and subsequent embodiments, the unicast PSSCH and the groupcast PSSCH may be classified in the process of decoding the sidelink control information (SCI) scheduling the corresponding PSSCH. For example, when decoding the SCI, the UE checks the RNTI by scrambling or descrambling the CRC in the process of checking the CRC. If the RNTI is the RNTI allocated for unicast transmission, the PSSCH scheduled with the SCI is uni If it is identified as a cast PSSCH, and the RNTI is an RNTI allocated for groupcast transmission, it may be confirmed that the PSSCH scheduled with the corresponding SCI is a groupcast PSSCH. Or, it may indicate whether the PSSCH for which a specific bitfield of the SCI is scheduled is for unicast or groupcast. Alternatively, if the resource pool through which the PSSCH is transmitted is a resource pool configured for unicast, the corresponding PSSCH is a unicast PSSCH, and if the resource pool through which the PSSCH is transmitted is a resource pool configured for groupcast, the corresponding PSSCH may be interpreted as a groupcast PSSCH.

[Example 4]

The fourth embodiment provides a method and apparatus for efficiently performing automatic gain control (AGC) by a terminal performing sidelink data transmission and reception.

The terminal performs a step of amplifying a received signal in receiving the signal. Determining how much the signal is amplified in the amplifying step may be a signal strength and a dynamic range of a terminal amplifier. The dynamic range is a range of signal strengths in which the input and output of the amplifier have a linear relationship. If the input and output of the amplifier does not have a linear relationship and the phase of the signal changes arbitrarily, the signal may not be used to receive data. However, if the degree of amplification is too large, the signal is not amplified to a certain intensity or more and its phase is randomly changed, so the terminal cannot arbitrarily amplify the received signal. Also, if the intensity of amplification is too small, there may be a deterioration in data reception performance. Therefore, the terminal needs to amplify the received signal with an appropriate intensity. Therefore, when the terminal performs amplification, it may be important to first determine the strength of the received signal. For example, if the intensity of the received signal is too large, the amplification degree is reduced, and if the received signal is too small, the amplification degree is increased. In this way, the terminal needs to change the degree of amplification according to the strength of the received signal. This operation is called AGC.

13 is a diagram illustrating a partial structure of a receiver of a terminal for performing AGC. The input signal of the terminal is first amplified by passing through a variable gain amplifier (VGA, 1300), which is transmitted to a detector (1310) that estimates the amplification intensity. The estimated signal strength is compared to a set point determined by the dynamic range of the terminal, and the difference value is confirmed by an error amplifier 1320, and the gain control is a parameter of VGA Is delivered to. The amplification degree is determined in the VGA according to the difference between the estimated signal strength and the reference value, and the amplification degree serves to ensure that the amplified signal is included in the dynamic range of the terminal amplifier. After all, the AGC operation may be a process of determining how much to amplify the received signal.

14 is a diagram illustrating an example of the strength of a signal that has passed through an amplifier when performing AGC when CP-OFDM or DFT-S-OFDM symbols are received over time. As the signal is received, the terminal performs the AGC step, and it takes time to determine the degree of amplification to amplify to an appropriate intensity. The time it takes to determine the appropriate degree of amplification of the amplifier through the AGC may be referred to as AGC settling time. In the example of FIG. 14, the terminal determines the degree of amplification by performing AGC for about 2 symbols. Since the signal received during the AGC determination time is less reliable, it may be difficult to be used for decoding data or control signals, and the signal according to the stabilized value 1400 after the AGC determination time may be used for decoding data or control signals. You can. Therefore, the terminal will need to reduce the AGC decision time to minimize the degradation of data transmission and reception performance.

FIG. 15 is a diagram showing an example of AGC determination time when a wider subcarrier spacing is used compared to FIG. 14. For example, FIG. 14 shows an example of the AGC determination time in the case of a subcarrier interval of 15 kHz, and FIG. 15 is a diagram showing an example of AGC determination time in the case of a subcarrier interval of 60 kHz. The OFDM signal having a 60 kHz subcarrier interval has a shorter symbol length than the 15 kHz subcarrier, so more OFDM symbols are included in the AGC determination time. Therefore, when a wider subcarrier interval is used, the UE needs to perform AGC performance more efficiently.

16 is a diagram showing an example of a structure of a terminal for performing AGC proposed in the present invention. The initial value determined by the initializer by adding an initializer (1630) to determine the initial value while performing AGC to the terminal, variable gain amplifier 1600, detector 1610, error amplifier 1620 and initializer 1630 AGC can be performed using. The initial values may refer to initial values when starting AGC in FIGS. 14 and 15, or may be related parameters. When performing the AGC, if the initial value is similar to the already stabilized value, the AGC determination time can be reduced, and thus, efficient AGC can be performed. Therefore, the initializer stores the stabilized values (1400, 1500) or related parameters in the memory, and based on this, the initial value for performing the AGC can be determined. In addition, the initializer may transmit an initial value or a parameter related thereto when the terminal performs AGC to the variable gain amplifier 1600. Alternatively, the variable gain amplifier receiving the related parameter may determine an initial value based on the related parameter. Although each device for performing AGC is shown in FIG. 16, this technique is only an example, and the above operation can be performed by the processor and the transceiver.

17 is a diagram illustrating an example in which the AGC determination time is reduced when the initial value for performing AGC is similar to the stabilized value after performing AGC. Compared to FIG. 15, it can be observed that the AGC determination time was significantly reduced.

In particular, this can be applied in the following cases. When the terminal receives a signal from a resource pool that has been previously set for sidelink data transmission and reception, the terminal stores the strength of the received signal from the resource pool. For example, the terminal updates the strength of a recently received signal whenever a signal is received from the resource pool A and stores information for an initial value when performing AGC. The information may be already described. Thereafter, when the terminal receives the signal from the other resource pool and then performs AGC when trying to receive the signal from the resource pool A again, for performing AGC using the strength value of the signal received from the resource pool A stored in advance Can be used as an initial value.

The method may also be applied to data transmission and reception using analog beamforming. Since the strength of the signal received by the terminal may vary greatly according to the analog beam, the terminal may need to efficiently perform AGC according to each analog beam. For example, the base station may apply a different analog beam for each symbol while transmitting a signal to the terminal, which can be seen in the diagram illustrated in FIG. 18. 18 is a diagram illustrating an example in which a base station transmits a control signal and a data signal by applying different analog beams according to symbols. If the terminal stores the strength of the signal transmitted and received using a specific analog beam, it identifies the analog beam applied to the signal to be received in the next symbol or slot and sets the AGC initial value using the recently stored signal strength value. Will be able to. When the same analog beam is applied, since it is highly likely that the signal strength is similar, in this case, the UE can set the initial AGC value close to the stabilized value and reduce the AGC decision time.

Also, it can be applied to multiple transmission and reception point (TRP) transmissions. 19 is a diagram illustrating an example of a terminal receiving signals from various TRPs. The terminal 1900 may receive signals from the TRP 1 1910 and the TRP 2 1920, and the strength of the signal received by the terminal may vary greatly depending on which TRP the signal is received. Therefore, when the terminal stores the strength of a signal recently received at a specific TRP and performs AGC on a symbol that receives a signal at the corresponding TRP, the terminal may set the strength of the stored signal as an initial value for performing AGC. In order to apply the above method, the terminal stores the signal strength according to a TCI (transmission configuration indication) indicator value indicated by higher layer signaling or control information, and based on the stored signal strength in case of signal transmission related to the same TCI. You can set the initial value of AGC.

AGC using the initial value of the terminal may be performed as follows. When performing AGC, the terminal initializes the stabilized value (or related parameter) and / or the strength related parameter of the received signal together with resource pool identification information such as the identifier of the resource pool that received the signal or the frequency-time resource location of the resource pool Can be stored in. This information can be updated whenever a signal is received on the resource pool. Alternatively, the stabilized value and / or the parameter related to the strength of the received signal may be stored together with the analog beam related information of the received signal or the TCI related to the received signal. At this time, the analog beam-related information may be at least one of a signal reception time to which a beam is applied, or a frequency-time resource to which a signal to which the beam is applied is transmitted, or information used to identify the analog beam.

When receiving a signal, the UE checks whether the stabilized value associated with the received signal is associated with a stored resource pool or analog beam or TCI. Specifically, the terminal receives a signal from the same resource pool as the resource pool stored in the initializing unit, the terminal receives the signal transmitted using the same analog beam as the analog beam received, or the terminal has the same TCI as the stored TCI. You can check whether you have received the relevant signal.

Then, when the terminal determines that the stored information and the received signal are related, the terminal determines an initial value for the AGC using a stabilized value stored in the initialization unit and / or a parameter related to signal strength. The initial value may be determined by an initialization unit or a variable gain amplifier. In addition, when a signal is received multiple times on the same resource pool, the UE may determine an initial value using a stabilized value and / or a related parameter related to the most recent signal. This method can also be used when the received signal is related to an analog beam or TCI.

When the UE determines that the received signal is not related to the resource pool or analog beam or TCI in which the related stabilized value is stored, the UE performs AGC without setting the initial value.

[Example 5]

In a fifth embodiment, a method and apparatus for determining channel coding or mapping parameters for limited buffer rate matching (LBRM) in consideration of the limit of soft buffers and a set resource pool in transmitting and receiving sidelink signals through broadcast, unicast, and group cast Provides

A resource block that is a frequency resource belonging to a resource pool for PSSCH in the LTE V2X system may be determined in the following way.

In the NR-based sidelink communication system, a resource pool may be defined similarly to the above, and a granularity of resource allocation in time may be a slot. Although the present invention focuses on the case where the resource pool is non-contiguously allocated in time, it is noted that the resource pool may be continuously allocated in time. In addition, in an NR-based system, a BWP for a sidelink is defined, a resource pool can be defined within the BWP, and one or more resource pools can be set for the terminal.

은 하기와 같은 방법으로 결정될 수 있다. Subframes that are time resources belonging to a resource pool for PSSCH in LTE V2X system

Can be determined in the following way.

Similar to the above, in the NR-based sidelink communication system, time-domain resources belonging to a resource pool can be determined and modified and applied. When the terminal is connected to the base station, in a Uu link based communication including DL or UL, the base station transmits a UE capability enquiry message to the terminal, and the terminal transmits UE capability information to the base station. It can be reported by higher layer signaling (or RRC signaling). The UE capability information may include information indicating a function that the UE can support, for example, a maximum value of a layer that can be supported when transmitting PUSCH or / and PDSCH. In addition, the base station may check UE capability information from an Access and Mobility Management function (AMF).

The base station may transmit configuration information for data transmission to the terminal through higher layer signaling. Such configuration information may be transmitted to a terminal through a plurality of system information blocks (SIBs) or / and RRC messages. The following information may be included in the setting information.

-PDCCH-Config, PDCCH-ConfigCommon, etc. PDCCH configuration information: Control resources for transmitting downlink control information (DCI) for scheduling data to PDCCH configuration information for scheduling uplink data or downlink data transmission Information for setting the CORESET and setting the search space is included.

-PDSCH configuration information such as PDSCH-Config, PDSCH-ConfigCommon, PDSCH-TimeDomainResourceAllocationList: The configuration information for the PDSCH through which downlink data is transmitted includes DMRS configuration for transmitting PDSCH and PDSCH resource allocation type for frequency domain resource allocation, PDSCH configuration Transmission configuration indication (TCI) setting indicating beam-related information to be applied, PDSCH time domain resource allocation information for time domain resource allocation included in downlink control information for time domain resource allocation, and aggregation factor applied to PDSCH transmission ( aggregation factor), rate matching information applied to the PDSCH, the maximum number of MIMO layers used, and code block group transmission configuration information.

-PUCCH-Config, PUCCH-ConfigCommon, etc. PUCCH configuration information: beam-related configuration applied to PUCCH (PUCCH-) for configuration information for PUCCH to which reception acknowledgment information (HARQ-ACK) for downlink data transmitted on PDSCH is transmitted SpatialRelationInfo) PUCCH resource set (PUCCH resource set) setting, PUCCH resource (PUCCH resource) setting and setting for each PUCCH format are included.

PUSCH configuration information such as PUSCH-Config and PUSCH-ConfigCommon: DMSCH configuration for PUSCH transmission and PUSCH resource allocation type for frequency domain resource allocation, and time domain resource allocation for PUSCH for uplink data transmission PUSCH time domain resource allocation information for frequency domain resource allocation included in downlink control information, frequency hopping information, aggregation factor applied to PUSCH transmission, MCS table information applied to PUSCH, PUSCH power control information, trans It includes form precoder settings, the maximum number of MIMO layers used, and code block group transmission setting information.

Each of the above steps may be omitted or the order may be changed.

The base station transmits downlink control information (DCI) for scheduling uplink data or downlink data to the terminal on the PDCCH. The terminal receives the scheduled DCI to itself through blind decoding on the search space identified based on the setting information for the data transmission. That is, the UE checks whether the CRC attached to the DCI payload received in the search space is scrambled with a Cell-Radio Network Temporary Identifier (C-RNTI) corresponding to the ID of the UE, and confirms its own C-RNTI as a result of the CRC check. If it is confirmed that it has been scrambled, it can be seen that the corresponding DCI has been transmitted to itself. The C-RNTI is, for example, RA-RNTI (random access RNTI, scheduling random access response message), P-RNTI (paging RNTI, PDSCH scheduling for paging message), SI-RNTI (system information RNTI, for system information) PDSCH may be replaced by RNTI for other purposes, such as scheduling).

The DCI includes a fallback DCI format 0_0 for scheduling a PUSCH, a non-fallback DCI format 0_1 for scheduling a PUSCH, a fallback DCI format 1_0, and PDSCH for scheduling a PDSCH. It may be one of 1_1, which is a non-fallback DCI format for scheduling. Hereinafter, information included in DCI format 1_1 is described as an example of DCI format.

- Carrier indicator: indicates on which carrier DCI is scheduled to be transmitted-0 or 3 bits

- Identifier for DCI formats: indicates DCI format-[1] bits

- Bandwidth part indicator: Indicate when the bandwidth part is changed-0, 1 or 2 bits

- Frequency domain resource assignment: Resource allocation information indicating frequency domain resource allocation. The resource expressed is different depending on whether the resource allocation type is 0 or 1.

- Time domain resource assignment: Resource allocation information indicating time domain resource allocation, which may indicate one layer of upper layer signaling or a predetermined PDSCH time domain resource allocation list -1, 2, 3, or 4 bits

- VRB-to-PRB mapping: indicates the mapping relationship between a virtual resource block (VRB) and a physical resource block (PRB)-0 or 1 bit

- PRB bundling size indicator: indicates the physical resource block bundling size assuming the same precoding is applied-0 or 1 bit

- Rate matching indicator: indicates which rate match group is applied among the rate match groups set as a higher layer applied to the PDSCH-0, 1, or 2 bits

- ZP CSI-RS trigger: Trigger the reference signal for zero power channel status information-0, 1, or 2 bits

-Transport block (TB) related configuration information: MCS (Modulation and coding scheme), NDI (New data indicator) and RV (Redundancy version) for one or two TBs are indicated.

- HARQ process number: indicates the HARQ process number applied to the PDSCH-4 bits

- Downlink assignment index: An index for generating a dynamic HARQ-ACK codebook when reporting HARQ-ACK for PDSCH-0 or 2 or 4 bits

- TPC command for scheduled PUCCH: Power control information applied to PUCCH for HARQ-ACK reporting for PDSCH-2 bits

- PUCCH resource indicator: Information indicating PUCCH resource for HARQ-ACK reporting for PDSCH-3 bits

- PDSCH-to-HARQ_feedback timing indicator: configuration information on which slot the PUCCH for HARQ-ACK reporting for the PDSCH is transmitted from-3 bits

- Antenna ports: Information indicating the antenna ports of the PDSCH DMRS and the DMRS CDM group in which the PDSCH is not transmitted-4, 5 or 6 bits

- Transmission configuration indication: Information indicating beam related information of PDSCH-0 or 3 bits

- SRS request: Information to request SRS transmission-2 bits

- CBG transmission information: information indicating which code block group (CBG) data is transmitted through PDSCH when code block group-based retransmission is set-0, 2, 4, 6, or 8 bits

- CBG flushing out information: Information indicating whether a code block group previously received by the terminal can be used for HARQ combining-0 or 1 bit

- DMRS sequence initialization: indicates DMRS sequence initialization parameters-1 bit

As an example, information included in DCI format 1_1 is described, but the above-described information may be used in other DCI formats for scheduling data.

Thereafter, when the base station transmits the DCI for scheduling the downlink data to the terminal, the transmission block (TB) is received from the MAC layer to generate downlink data to be transmitted to the terminal through channel coding in the physical layer. Specifically, the base station attaches the TB CRC to the TB, and if necessary, splits the TB with the TB CRC attached to a code block (CB) to attach the CB CRC, and encodes data by applying LDCP coding. Thereafter, rate matching and CB concatenation may be applied to the encoded data. The size of TB at this time can be calculated as described in the present invention. When the base station transmits DCI for scheduling uplink data, the operation of the above-described base station may be performed by the terminal to generate uplink data.

The generated downlink data or uplink data is transmitted on resources determined according to time-frequency domain resource allocation information included in DCI on PDSCH or PUSCH, respectively. In addition, the downlink data or uplink data is transmitted together with higher layer signaling and DMRS set in DCI.

When receiving the downlink data, the UE transmits HARQ-ACK information indicating whether the downlink data is successfully transmitted on the PUCCH or PUSCH. At this time, when the HARQ-ACK information is transmitted on the PUCCH, it may be transmitted to the base station through the slot and PUCCH resource indicated by the DCI. Alternatively, HARQ-ACK information may be transmitted on PUSCH.

The size of TB in an NR system can be calculated through the following steps.

를 계산한다. Step 1: The number of REs allocated for PDSCH mapping in one PRB in the allocated resource

To calculate.

는

로 계산될 수 있다. 여기에서,

는 12이며,

는 PDSCH에 할당된 OFDM 심볼 수를 나타낼 수 있다.

는 같은 CDM 그룹의 DMRS가 차지하는, 한 PRB내의 RE 수이다.

는 상위 시그널링으로 설정되는 한 PRB내의 오버헤드가 차지하는 RE 수이며, 0, 6, 12, 18 중 하나로 설정될 수 있다. 이 후, PDSCH에 할당된 총 RE 수

가 계산될 수 있다.

는

로 계산되며,

는 단말에게 할당된 PRB 수를 나타낸다.

The

Can be calculated as From here,

Is 12,

Denotes the number of OFDM symbols allocated to the PDSCH.

Is the number of REs in a PRB occupied by DMRSs of the same CDM group.

Is the number of REs occupied by the overhead in the PRB as long as it is set as upper signaling, and may be set to one of 0, 6, 12, and 18. Subsequently, the total number of REs allocated to the PDSCH

Can be calculated.

The

Is calculated as,

Indicates the number of PRBs allocated to the terminal.

는

로 계산될 수 있다. 여기에서, R은 코드레이트이며, Qm은 변조 오더 (modulation order)이며, 이 값의 정보는 제어정보에서 MCS 비트필드와 미리 약속된 표를 이용하여 전달될 수 있다. 또한, υ는 할당된 레이어 수이다. 만약

이면, 하기의 단계 3을 통해 TBS가 계산될 수 있다. 이외에는 단계 4를 통해 TBS가 계산될 수 있다. Step 2: Number of temporary information bits

The

Can be calculated as Here, R is a code rate, Qm is a modulation order, and information of this value can be transmitted using an MCS bitfield and a predetermined table in control information. In addition, υ is the number of allocated layers. if

If it is, TBS can be calculated through Step 3 below. Otherwise, the TBS can be calculated through step 4.

와

의 수식을 통해

가 계산될 수 있다. TBS는 하기 [표 8]에서

보다 작지 않은 값 중

에 가장 가까운 값으로 결정될 수 있다. Step 3:

Wow

Through the formula of

Can be calculated. TBS is shown in Table 8 below.

Less than

It can be determined as the value closest to.

[Table 8]

와

의 수식을 통해

가 계산될 수 있다. TBS는

값과 하기 [pseudo-code 1]을 통해 결정될 수 있다.Step 4:

Wow

Through the formula of

Can be calculated. TBS

It can be determined through the value and the following [pseudo-code 1].

[Start Pseudo-code 1]

[End of Pseudo-code 1]

When one CB is input to the LDPC encoder in the NR system, parity bits may be added and output. At this time, the amount of parity bits may vary according to the LDPC base graph. A method of sending all parity bits generated by LDPC coding for a specific input may be called full buffer rate matching (FBRM), and a method of limiting the number of parity bits that can be transmitted is called limited buffer rate matching (LBRM). can do. When a resource is allocated for data transmission, the LDPC encoder output is made into a circular buffer, and the bits of the created buffer are repeatedly transmitted as much as the allocated resource. At this time, the length of the circular buffer may be referred to as Ncb. If N is the number of all LDPC codeword bits generated by LDPC coding, then Ncb = N in the FBRM method. The LDPC codeword bit may include some information word bits for applying LDPC coding.

는

가 되며,

는

로 주어지며,

은 2/3으로 결정될 수 있다.

은 전술한 TBS를 구하는 방법에서, 해당 셀에서 단말이 지원하는 최대 레이어 수를 나타내고, 해당 셀에서 단말에게 설정된 최대 변조오더 또는 설정되지 않았을 경우에는 64QAM을 가정하고, 코드레이트는 최대 코드레이트인 948/1024를 가정하며,

는

로 가정하고

는

으로 가정할 수 있다.

는 상기의 [표 7]으로 주어질 수 있다. In the LBRM method,

The

Becomes

The

Is given by

Can be determined as 2/3.

In the above-described method for obtaining the TBS, it indicates the maximum number of layers supported by the terminal in the cell, and assumes the maximum modulation order set to the terminal in the cell or 64QAM if not set, and the code rate is 948, the maximum code rate. Assuming / 1024,

The

Assuming

The

Can be assumed as

Can be given as [Table 7] above.

The maximum data rate supported by the terminal in the NR system may be determined through Equation 1 below.

[Equation 1]

는 최대 레이어 수,

는 최대 변조 오더,

는 스케일링 지수,

는 부반송파 간격을 의미할 수 있다.

는 1, 0.8, 0.75, 0.4 중 하나의 값을 단말이 보고할 수 있으며,

는 하기의 [표 9]로 주어질 수 있다.In Equation 1, J is the number of carriers bound by frequency aggregation (carrier aggregation), Rmax = 948/1024,

Is the maximum number of layers,

Is the maximum modulation order,

Is the scaling index,

Can mean the subcarrier spacing.

The terminal can report a value of 1, 0.8, 0.75, or 0.4,

Can be given as [Table 9] below.

[Table 9]

는 평균 OFDM 심볼 길이이며,

는

로 계산될 수 있고,

는 BW(j)에서 최대 RB 수이다.

는 오버헤드 값으로, FR1 (6 GHz 이하 대역)의 하향링크에서는 0.14, 상향링크에서는 0.18로 주어질 수 있으며, FR2 (6 GHz 초과 대역)의 하향링크에서는 0.08, 상향링크에서는 0.10로 주어질 수 있다. [수학식 1]을 통해 30 kHz 부반송파 간격에서 100 MHz 주파수 대역폭을 갖는 셀에서의 하향링크에서의 최대 데이터율은 하기의 [표 10]로 계산될 수 있다.Also,

Is the average OFDM symbol length,

The

Can be calculated as

Is the maximum number of RBs in BW (j).

Is an overhead value, and may be given as 0.14 in the downlink of FR1 (band below 6 GHz) and 0.18 in the uplink, 0.08 in the downlink of FR2 (band above 6 GHz), and 0.10 in the uplink. Through [Equation 1], the maximum data rate in downlink in a cell having a 100 MHz frequency bandwidth at a 30 kHz subcarrier interval can be calculated as [Table 10] below.

Table 10

On the other hand, the actual data rate that the terminal can measure in actual data transmission may be a value obtained by dividing the data amount by the data transmission time. This may be a value obtained by dividing the sum of TBS in TBS in 1 TB transmission or the TTI length in 2 TB transmission. As an example, assuming Table 9, the maximum actual data rate in downlink in a cell having a 100 MHz frequency bandwidth at a 30 kHz subcarrier interval may be determined as shown in [Table 11] according to the number of assigned PDSCH symbols. have.

[Table 11]

 The maximum data rate supported by the terminal can be checked through [Table 10], and the actual data rate according to the allocated TBS can be checked through [Table 11]. In this case, the actual data rate may be larger than the maximum data rate depending on the scheduling information.

In a wireless communication system, particularly a New Radio (NR) system, a data rate that a terminal can support can be promised to each other between a base station and a terminal. This can be calculated using the maximum frequency band supported by the terminal, the maximum modulation order, the maximum number of layers, and the like. However, the calculated data rate may be different from a value calculated from a transport block size (TBS) and a transmission time interval (TTI) length used for actual data transmission.

Accordingly, the terminal may be allocated a TBS larger than a value corresponding to a data rate supported by the terminal. It may be necessary to minimize this case and define the operation of the terminal in this case.

In NR-based sidelink data transmission, TBS calculation may be determined based on a combination of at least one of the following parameters.

- CP length set for the resource pool

- Number of symbols per slot set for the resource pool

- Scheduling information indicated in SCI (number of symbols of PSSCH, number of PRBs of frequency resources, and MCS index)

- Number of aggregated slots indicated by SCI

- Slot cycle information of a physical sidelink feedback channel (PSFCH) resource set for the corresponding resource pool (for example, indicating that PSFCH can be transmitted for each N slot)

- Whether to resend

In the side link, whether to use full buffer rate matching (FBRM), which can be transmitted using all parity generated by channel coding, or LBRM, which partially transmits parity generated by channel coding, is set for each resource pool (configuration or pre- configuration). Alternatively, whether to apply LBRM or FBRM on the sidelink may be set according to unicast, groupcast, and broadcast transmission / reception in a resource pool. That is, even in the same resource pool, LBRM can be applied in unicast and groupcast, and FBRM can be applied in broadcast. Alternatively, whether to apply LBRM or FBRM in the sidelink may be determined according to whether retransmission is possible. As an example, FBRM may be applied in a transmission mode in which only the initial transmission is ended and retransmission is not performed according to a resource pool or a setting in the resource pool, and FBRM may be applied in other cases. Or, when a terminal and a terminal are established with a PC5-RRC connection required for sidelink unicast or groupcast communication, FBRM is used by exchanging capabilities for FBRM or LBRM with each other through PC5-RRC signaling, or by sending and receiving a set value. You will be able to decide whether or not to use LBRM.

는

가 되며,

는

로 주어지며,

은 2/3으로 결정될 수 있다. 상기에서 N은 주어진 코드블록을 채널코딩을 수행하여 얻어진 모든 패리티를 포함한 coded bits 수를 의미할 수 있다.

은 전술한 TBS를 구하는 방법에서, 해당 셀에서 단말이 지원하는 최대 레이어 수를 나타내고, 해당 셀에서 단말에게 설정된 최대 변조오더가 설정되지 않았을 경우에는 64QAM을 가정하고, 코드레이트는 최대 코드레이트인 948/1024를 가정하며,

는

로 가정하고

는

으로 가정할 수 있다.

는 해당 리소스풀에 설정된 PRB 수일 수 있다. 또는 사이드링크 BWP에 설정된 송수신을 위한 사이드링크 리소스풀 중 가장 많은 PRB를 사용하도록 설정된 리소스풀의 PRB 수를 의미할 수 있다. FBRM을 사용한다고 하는 것은 상기 Ncb를 N으로 결정하는 것과 같은 의미일 수 있다. 상기에서

는

로 가정하는 것으로 설명하였지만, 이는 기지국과의 DL 또는 UL 통신을 위해 사용하는 값일 수 있고, 사이드링크에서는 N_RE를

로 계산할 수 있다. 상기에서 사용하는 144는 일례에 불과하며 뿐이며 이에 한정되지 않고 본 발명이 적용될 수 있다. 즉 사이드링크 통신을 위한 LBRM 적용시에,

또는

로 적용할 수 있을 것이며, 본 발명의 요지는, 기지국과의 DL 또는 UL 통신시에 LBRM 적용을 위한

와 사이드링크 통신시에 LBRM 적용을 위한

와 위해 사용하는 값이 다를 수 있거나, 또는 기지국과의 DL 또는 UL 통신시에 LBRM 적용을 위한

보다 사이드링크 통신시에 LBRM 적용을 위한

이 더 작을 수 있다는 것이다. 이는, 사이드링크에서 하나의 슬롯에서 송신과 수신 스위칭을 위한 시간을 확보하기 위한 1심볼 또는 미리 정해진 개수의 심볼 또는 설정된 개수의 심볼을 비워두는 것 때문에 종래 기지국과의 DL 또는 UL 통신에서보다 사용할 수 있는 심볼 수가 더 적어지는 것 때문일 수 있다.In the LBRM method for sidelink transmission,

The

Becomes

The

Is given by

Can be determined as 2/3. In the above, N may mean the number of coded bits including all parities obtained by performing channel coding on a given code block.

In the above-described method for obtaining the TBS, the maximum number of layers supported by the terminal in the cell is assumed, and when the maximum modulation order set for the terminal in the cell is not set, 64QAM is assumed, and the code rate is 948, the maximum code rate. Assuming / 1024,

The

Assuming

The

Can be assumed as

May be the number of PRBs set in the resource pool. Alternatively, it may mean the number of PRBs of the resource pool configured to use the largest PRB among the sidelink resource pools for transmission and reception set in the sidelink BWP. Using FBRM may have the same meaning as determining Ncb as N. From above

The

Although it has been described assuming as, it may be a value used for DL or UL communication with a base station, and N _RE in a side link.

Can be calculated as The 144 used above is only an example, and the present invention can be applied without being limited thereto. That is, when applying LBRM for sidelink communication,

or

The subject matter of the present invention is for applying LBRM in DL or UL communication with a base station.

For LBRM application in side link communication

The value used for and may be different, or for LBRM application in DL or UL communication with the base station.

For LBRM application in side link communication

It can be smaller. This can be used more than in a DL or UL communication with a conventional base station because one symbol or a predetermined number of symbols or a predetermined number of symbols are empty to secure time for transmission and reception switching in one slot in the sidelink. This may be due to fewer symbols being present.

[Example 6]

In the sixth embodiment, a method of transmitting and receiving HARQ-ACK feedback from a receiving terminal and a method of performing retransmission by receiving a HARQ-ACK feedback from receiving terminals is provided by a receiving terminal for transmitting and receiving HARQ-ACK feedback in groupcast data transmission and reception. In this embodiment, the base station may be applied as a transmitting terminal.

When the base station transmits a TB composed of one or more CBs to the receiving terminals in the groupcast, the receiving terminals perform decoding and determine which CB decoding has failed and decoding has not been successfully performed. Accordingly, it is possible to calculate how many CBs have failed decoding. The base station sets uplink resources or PUCCH resources for receiving terminals to perform HARQ-ACK transmission before performing corresponding data transmission. The setting of the PUCCH resources may be to enable a receiving terminal to transmit an uplink signal or PUCCH for transmitting HARQ-ACK feedback information in each PUCCH resource. For example, PUCCH resources may be determined based on the number of CBs that have failed decoding at the receiving terminal.

Of the one or more PUCCH resources, which PUCCH resource is set, which PUCCH resource to transmit HARQ-ACK feedback information on PUCCH may be determined based on the number of CBs that have failed decoding or the number of CBs that have been successfully decoded. In one example, the base station can set the first PUCCH resource, the second PUCCH resource, the third PUCCH resource, ..., the tenth PUCCH resource, and if one CB fails to decode, the receiving terminal receives the PUCCH from the first PUCCH resource. Transmit, if two CB decoding fails, the receiving terminal transmits PUCCH on the second PUCCH resource, if three CB decoding fails, the receiving terminal transmits PUCCH on the third PUCCH resource, and nine CB decoding fails The receiving terminal transmits PUCCH in the ninth PUCCH resource, and if ten or more CBs fail to decode, the receiving terminal may transmit PUCCH in the tenth PUCCH resource. As a result, since multiple terminals can transmit PUCCH on the 10 PUCCH resources set, one or a plurality of receiving terminals may be able to transmit PUCCH on a common PUCCH resource.

The base station attempts to receive an uplink signal or a physical channel from all configured PUCCH resources, and in all terminals receiving data and transmitting feedback information to the PUCCH, information about the maximum number of CBs that decoding fails in one terminal. Able to know. In addition, based on this, it is possible to know the maximum number of CBs that the receiving terminals fail to decode among the receiving terminals. For example, if the base station does not receive PUCCH in the 10th PUCCH resource and receives PUCCH in the ninth PUCCH resource, this means that among the multiple receiving terminals, the receiving terminal having the most CBs that failed to decode is decoded for 9 CBs. It may mean that you have failed.

For example, suppose that the base station sets the 10th PUCCH resource from the first PUCCH resource and transmits the TB including 14 CBs. If the 5 receiving terminals fail to decode 2, 1, 6, 8, and 1 CBs respectively, the first receiving terminal transmits feedback on the second PUCCH resource, and the second receiving terminal first The PUCCH resource sends feedback, the third receiving terminal sends feedback from the sixth PUCCH resource, the fourth receiving terminal sends feedback from the eighth PUCCH resource, and the fifth receiving terminal receives feedback from the first PUCCH resource. Can transmit. The base station may receive feedback information from the first PUCCH resource, the second PUCCH resource, the sixth PUCCH resource, and the eighth PUCCH resource. In this way, the base station will be able to confirm that 8 CBs have failed decoding at any one terminal.

Therefore, the base station can generate 8 or more parity CBs by applying 14 data CBs as an outer code, and transmits the generated parity CBs in retransmission. The receiving terminals will be able to obtain all data CBs by first decoding the 8 parity CBs with LDPC code or turbo code, and applying the parity CBs successfully decoded and the data CBs previously decoded to outer code decoding. The receiving terminals can check the information transmitted by the base station based on the data CB obtained by combining the data CB obtained through the parity CB with the data CB that was first received. In this way, the base station can perform the HARQ operation by transmitting the same retransmission (parity CB) to the receiving terminals, and can perform retransmission even if it does not know which terminal has failed to decode which CB. In the above, the number of parity CBs during initial transmission or retransmission may be transmitted in control information.

The base station may receive the HARQ-ACK feedback and generate and transmit a parity CB based on the number of CBs that have failed decoding as much as possible. The parity CB may be generated from data CBs using Reed-Solomon (RS) code, Luby-transform code, or Raptor code. This may be referred to as a linked code structure or outer code structure.

22A and 22B are diagrams illustrating a process of channel coding and decoding according to whether outer codes are used in a wireless communication system according to various embodiments of the present disclosure. Specifically, FIG. 22A is a diagram showing a channel coding and decoding process when an outer code is not used, and FIG. 22B is a diagram showing a channel coding and decoding process when an outer code is used.

Referring to FIG. 22A, when an outer code is not used, the first channel coding encoder 2211 of the transmitting device and the second channel coding decoder 2215 of the receiving device are used in the process of transmitting and receiving a signal through the channel 2213. The second channel coding encoder 2221 of the transmitting device and the second channel coding decoder 2223 of the receiving device may not be used. When the outer code is not used, the first channel coding encoder 2211 and the first channel coding decoder 915 may be configured in the same way as when the outer code is used.

Referring to FIG. 22B, when an outer code is used, data to be transmitted passes through a second channel coding encoder 2221 when an outer code is used. Bits or symbols that have passed through the second channel coding encoder 2221 pass through the first channel coding encoder 2211. When the channel-coded symbols through the second channel coding encoder 2221 and the first channel coding encoder 2211 are received by the receiving device through the channel 2213, the receiving device receives the received signal from the first channel coding decoder 2215 and the second channel coding decoder 2223. Can be passed sequentially. The first channel coding decoder 2215 and the second channel coding decoder 2223 may perform operations corresponding to the first channel coding encoder 2211 and the second channel coding encoder 2221, respectively.

23 is a diagram illustrating a process of obtaining code blocks (CBs) and parity bit CBs (PCBs) in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 23, TB 2311 to which TB 2311 and CRC 2313 are added may be divided into at least one CB. When one CB is generated according to the size of TB, CRC may not be added to the generated CB. When outer codes are applied to CBs 2321, 2323, 2325, and 2327 (or CBs 2331, 2333, 2335, and 2337) to be transmitted, CBs 2341 and 2343 may be generated.

According to various embodiments of the present disclosure, the CB divided by TB (or TB with CRC added), such as CBs 2321, 2323, 2325, and 2327 (or CBs 2331, 2333, 2335, 2337), is data CBs may be referred to as CBs, and CBs generated by applying an outer code to data CBs such as CBs 2341 and 2343 may be referred to as parity CBs (PCBs).

The PCBs 2341 and 2343 generated according to the application of the outer code may be located after the last CB 2337. After the outer code is applied, CRCs 2351, 2352, 2353, 2354, 2355, 2356 can be added to each CB or each PCB. Thereafter, each CB to which CRC is added or each PCB to which CRC is added may be encoded based on a channel code (eg, a first channel code).

The NR system employs an HARQ method that retransmits the corresponding data in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ method, when a receiving device fails to decode data, the receiving device transmits information (Negative Acknowledgement) (NACK) indicating that decoding is failed to the transmitting device so that the transmitting device can retransmit the corresponding data in the physical layer. Means the way. The receiving device may improve data reception performance by combining data retransmitted by the transmitting device with data that has previously failed decoding. In addition, when the receiving device successfully decodes the data, the receiving device may transmit information (ACK (Acknowledgement)) indicating the success of decoding to the transmitting device, so that the transmitting device may transmit new data.

Since there is a high likelihood that CBs in which decoding fails in a plurality of receivers are different, the number of CBs to be retransmitted increases as the number of receivers increases. When an outer code is used, even if CBs that have failed decoding by each of the plurality of receiving devices are different, the transmitting device receives by transmitting common parity CBs generated by applying the outer code to the plurality of receiving devices. It is possible for devices to restore desired data CBs using common parity CBs. To this end, since the receiving device can transmit information indicating the number of data CBs whose decoding has failed, rather than information indicating the index of the data CB whose decoding has failed, the number of bits of feedback information that the receiving device transmits to the transmitting device Can be reduced.

24 is a diagram illustrating a signal flow diagram illustrating a process of data transmission between a transmitting device and receiving devices in a wireless communication system according to various embodiments of the present disclosure. Below, the transmitting device is a device that transmits data using a side link or a cellular link, and may be, for example, a terminal or a base station, and the receiving device receives data from the transmitting device and receives HARQ-ACK feedback for the data. As an example of a device to be performed, it may be a terminal or a base station.

Referring to FIG. 24, in step 2401, the transmitting device transmits data to the receiving devices. The transmission of data performed in operation 2401 may be initial transmission of data. The transmitting device may transmit data transmitted from the MAC layer through a physical channel, and the physical channel may include a control channel. For example, the transmitting device can transmit at least one TB to the receiving devices. Each TB transmitted in operation 2401 may include at least one data CB.

In step 2403, the receiving devices may transmit feedback information such as HARQ-ACK feedback to the transmitting device. The feedback information may include decoding results for data corresponding to the initial transmission. For example, the feedback information may include information regarding the number of CBs that have failed decoding or the number of CBs that have successfully decoded among the CBs included in data corresponding to the initial transmission. In other words, the feedback information may include information indicating the number of CBs that have successfully decoded or the number of CBs that have successfully been decoded.

In step 2405, the transmitting device transmits the data CB and / or parity CBs to the receiving devices based on the feedback information received in step 2403. The transmission of data performed in operation 2405 may be retransmission of data. For example, the transmitting apparatus may transmit parity CBs not transmitted in the initial transmission stage in the retransmission stage. The transmitting apparatus may determine the number of parity CBs to transmit in the retransmission step based on the feedback information. For example, if the feedback information includes information indicating the number of CBs that decoding has failed by each receiving device, the transmitting device retransmits the number corresponding to the maximum value among the number of CBs that decoding has failed by each receiving device. In step, it may be determined by the number of parity CBs for transmission, and the transmitting device may transmit the corresponding number of parity CBs to the receiving devices.

In step 2407, the receiving devices may transmit feedback information such as HARQ-ACK feedback to the transmitting device. The feedback information may include a decoding result for data transmitted in the retransmission step. For example, the feedback information may include information about the number of CBs that have failed decoding or the number of CBs that have successfully decoded among the CBs included in the data transmitted in the retransmission step.

25 is a flowchart illustrating a transmission apparatus for performing retransmission in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 25, in step 2501, the transmitting device transmits the TB to at least one terminal. The transmission of step 2501 may be an initial transmission. When the transmitting device is a terminal, the terminal may be set or scheduled by a base station to transmit data to another terminal, or may be a terminal having authority to transmit data to other terminals in the group. At least one terminal that has received the TB decodes data based on the control information, and determines whether CBs of the received TB have been successfully decoded. Each at least one terminal transmits feedback information (eg, HARQ-ACK feedback) including information indicating the number of CBs for which decoding has failed or the number of CBs for which decoding has been successful.

In step 2503, the transmitting device determines whether all CBs in the TB have been successfully decoded by at least one receiving device. For example, the transmitting device may determine whether all CBs in the TB have been successfully decoded by the at least one receiving device based on feedback information received from the at least one receiving device. If all CBs in the TB have been successfully decoded by at least one receiving device, the transmitting device can terminate this algorithm.

If all CBs in the TB have not been successfully decoded by at least one receiving device, in step 2505, the transmitting device determines the number of parity CBs to transmit based on the feedback information received from the receiving device, and the determined number of parity CBs Are transmitted to at least one CB. The transmitting device may obtain parity CBs by applying an outer code to CBs in the TB. For example, the transmitting device identifies the maximum value of the number of CBs that decoding has failed by each receiving device based on the feedback information, and can transmit the number of parity CBs corresponding to the identified maximum value to the at least one receiving device. have.

According to various embodiments of the present disclosure, the transmitting device transmits and / or retransmits data based on the outer code, and the receiving device receiving the data has successfully decoded the number of CBs included in the data or decoding is successful. The number of CBs can be fed back to the transmitting device. This feedback method can achieve a performance gain effect that the amount of feedback or the amount of data to be retransmitted can be dramatically reduced, unlike the conventional method of feeding back information indicating the CB or CBG in which decoding has failed.

To perform the above embodiments of the present invention, a transmitting unit, a receiving unit, and a processing unit of a terminal and a base station are illustrated in FIGS. 20 and 21, respectively. In the above embodiments, a method of transmitting a HARQ-ACK of a terminal is determined, and a method of transmitting / receiving a terminal or a base station for performing AGC is shown. To accomplish this, a receiving unit, a processing unit, and a transmitting unit of the base station and the terminal are respectively performed according to the embodiment. It should work. In the following operation, the base station may be a terminal performing transmission on the sidelink or a conventional base station. In the following operation, the terminal may be a terminal that performs transmission or reception on the sidelink.

Specifically, FIG. 20 is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention. As illustrated in FIG. 20, the terminal of the present invention may include a terminal receiving unit 2000, a terminal transmitting unit 2004, and a terminal processing unit 2002. The terminal receiving unit 2000 and the terminal transmitting unit 2004 may be collectively referred to as a transmitting / receiving unit in an embodiment of the present invention. The transmitting and receiving unit may transmit and receive signals to and from a base station. The signal may include control information and data. To this end, the transmission / reception unit may be configured with an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that amplifies the received signal with low noise and down-converts the frequency. In addition, the transmission / reception unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 2002, and transmit a signal output from the terminal processing unit 2002 through the wireless channel. The terminal processing unit 2002 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present invention.

21 is a block diagram showing the internal structure of a base station according to an embodiment of the present invention. As shown in FIG. 21, the base station of the present invention may include a base station receiver 2101, a base station transmitter 2105, and a base station processor 2103. The base station receiver 2101 and the base station transmitter 2105 may be collectively referred to as a transmitter / receiver in an embodiment of the present invention. The transmitting and receiving unit may transmit and receive signals to and from the terminal. The signal may include control information and data. To this end, the transmission / reception unit may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, an RF receiver that amplifies the received signal with low noise, and down-converts the frequency. In addition, the transmission / reception unit may receive a signal through a wireless channel, output the signal to the base station processing unit 2103, and transmit a signal output from the base station processing unit 2103 through the wireless channel. The base station processor 2103 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.

On the other hand, the embodiments of the present invention disclosed in this specification and the drawings are merely to provide a specific example to easily explain the technical content of the present invention and to understand the present invention, and are not intended to limit the scope of the present invention. That is, it is apparent to those skilled in the art to which other modifications based on the technical idea of the present invention can be practiced. In addition, each of the above embodiments can be operated in combination with each other as necessary. For example, it may be possible to apply the first embodiment and the second embodiment in combination. In addition, the above embodiments may be implemented in other modifications based on the technical idea of the above embodiment, such as LTE system, 5G system.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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