KR20230020784A - Method and apparatus for transmission and reception of control information and data in communications system using sidelink - Google Patents

Abstract

The present invention relates to a communication technique that combines a 5G communication system with an IoT technology to support a higher data transmission rate after a 4G system and a system thereof. The present invention can be applied to intelligent services (eg, 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. The present invention provides a method for generating and interpreting an SCI by a transmitting terminal and a receiving terminal for PSSCH transmission in a sidelink and a device.

Description

Method and device for transmitting and receiving control information and data in a communication system using sidelink

The present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for instructing resource allocation for data transmission and reception of a terminal through a sidelink in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system to meet the growing demand for wireless data traffic after the commercialization of the 4G communication system. For this reason, the 5G communication system or pre-5G communication system is being called a Beyond 4G Network communication system or a Post LTE system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation etc. are being developed. In addition, in the 5G system, advanced coding modulation (Advanced Coding Modulation: ACM) methods FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non orthogonal multiple access) and SCMA (sparse code multiple access) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network in which humans create and consume information to an Internet of Things (IoT) network in which information is exchanged and processed between distributed components such as things. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with a cloud server, etc., 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, sensor networks for connection between objects and machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new values in human life by collecting and analyzing data generated from connected objects can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, and 5G communication technologies There is. The application of the cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology.

In addition, in the 5G system, Advanced Coding Modulation (ACM) methods such as FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding) and advanced access technology FBMC (Filter Bank Multi Carrier) ), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed.

As a wireless communication system develops, such as a 5G system, it is expected to be able to provide various services. Therefore, there is a need for a method for smoothly providing services related to a method of mapping control information and a method of indicating the location of resources to be transmitted next when data is transmitted in sidelink communication.

The present disclosure provides a method and apparatus for indicating the location of a resource for transmitting data through a sidelink in a wireless communication system. By determining the location of the resource previously occupied according to the method and apparatus of the present disclosure, the receiving terminal can preliminarily determine the location of the resource to be used by the transmitting terminal.

The present disclosure also provides a method and apparatus for determining control information mapping in a sidelink. Since the control information mapping method is determined according to the method and apparatus of the present disclosure, the transmitting terminal and the receiving terminal can understand the mapping of control information transmitted and received using the same mapping method.

The present disclosure for solving the above problems provides 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 invention proposed in this disclosure, since the location of a transmission resource in a sidelink can be effectively indicated through control information, a transmitting terminal and a receiving terminal can effectively perform sidelink communication.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
5 is a diagram illustrating a resource structure in a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.
6A is a diagram illustrating an example of allocating data for each service to frequency-time resources in a wireless communication system according to an embodiment of the present disclosure.
6B is a diagram illustrating another example of allocating data for each service to frequency-time resources in a wireless communication system according to an embodiment of the present disclosure.
7 is a diagram illustrating an encoding method of data in a wireless communication system according to an embodiment of the present disclosure.
8 is a diagram illustrating mapping of synchronization signals and broadcast channels in a wireless communication system according to an embodiment of the present disclosure.
9 is a diagram illustrating an example of arrangement of a synchronization signal/physical broadcast channel block (SSB) in a wireless communication system according to an embodiment of the present disclosure.
10A is a diagram illustrating transmittable symbol positions of SSBs according to subcarrier intervals in a wireless communication system according to an embodiment of the present disclosure.
10B is a diagram illustrating transmittable symbol positions of SSBs according to subcarrier intervals in a wireless communication system according to an embodiment of the present disclosure.
11 is a diagram illustrating an example of generation and transmission of parity bits in a wireless communication system according to an embodiment of the present disclosure.
12A is a diagram illustrating an example of groupcasting transmission in a wireless communication system according to an embodiment of the present disclosure.
12B is a diagram illustrating an example of hybrid automatic repeat request (HARQ) feedback transmission according to group casting in a wireless communication system according to an embodiment of the present disclosure.
13 is a diagram illustrating an example of unicasting transmission in a wireless communication system according to an embodiment of the present disclosure.
14A is a diagram illustrating an example of sidelink data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
14B is a diagram illustrating an example of sidelink data transmission without scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.
15 is a diagram illustrating an example of a channel structure of a slot used for sidelink communication in a wireless communication system according to an embodiment of the present disclosure.
16A is a diagram illustrating a first example of a distribution of feedback channels in a wireless communication system according to an embodiment of the present disclosure.
16B is a diagram illustrating a second example of a distribution of feedback channels in a wireless communication system according to an embodiment of the present disclosure.
17A is a diagram illustrating an example of a method in which resource allocation of a PSSCH is performed in units of subchannels according to an embodiment of the present disclosure.
17B is a diagram illustrating an example of a method in which resource allocation of a PSSCH is performed in units of subchannels according to an embodiment of the present disclosure.
18 is a flowchart illustrating a method for a transmitting terminal to determine values of bit fields of first control information and second control information according to an embodiment of the present disclosure.
19 is a flowchart illustrating a method of sequentially decoding first control information and second control information by a receiving terminal according to an embodiment of the present disclosure and decoding a PSSCH based thereon.
20 is a diagram illustrating an example in which a frequency domain is divided in units of subchannels in a given resource pool and resources are allocated for data transmission in units of subchannels according to an embodiment of the present disclosure.
21 is a diagram illustrating an example in which a transmitting terminal transmits a PSCCH and a PSSCH in a sidelink.
22 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
23 is a block diagram illustrating the internal structure of a base station according to an embodiment of the present disclosure.
24 is a block diagram of a terminal according to an embodiment of the present disclosure.
25 is a block diagram of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring it by omitting unnecessary description.

For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In each figure, the same reference number is given to the same or corresponding component.

Advantages and features of the present disclosure, and methods of achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms, only the present embodiments make the disclosure of the present disclosure complete, and common knowledge in the art to which the present disclosure belongs. It is provided to completely inform the person who has the scope of the invention, and the present disclosure is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

At this time, it will be understood that each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). Create means to perform functions. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory The instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s). The computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).

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

At this time, the term '~unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~unit' performs certain roles. do. However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Components and functions provided within '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card. Also, in the embodiment, '~ unit' may include one or more processors.

A term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, a term referring to a component of a device, and a connection node used in the following description. Terms for identification, terms for messages, terms for interfaces between network objects, and terms for various types of identification information are illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

Hereinafter, in the present disclosure, a physical channel and a signal may be used interchangeably with data or control signals. For example, a physical downlink shared channel (PDSCH) is a term that refers to a physical channel through which data is transmitted, but PDSCH may also be used to refer to data. That is, in the present disclosure, the expression 'transmitting a physical channel' may be interpreted as equivalent to the expression 'transmitting data or signals through a physical channel'.

Hereinafter, in the present disclosure, higher-order signaling refers to a method of transmitting a signal from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer. Upper signaling may be understood as radio resource control (RRC) signaling or MAC control element (hereinafter referred to as 'CE').

In addition, in the present disclosure, the expression of more than or less than is used to determine whether a specific condition is satisfied or fulfilled, but this is only a description to express an example and excludes more or less description. It's not about doing it. Conditions described as 'above' may be replaced with 'exceeds', conditions described as 'below' may be replaced with 'below', and conditions described as 'above and below' may be replaced with 'above and below'.

For convenience of description below, the present disclosure uses terms and names defined in 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) or NR (New Radio) standards, or modified terms and names based thereon. However, the present disclosure is not limited by the above-described terms and names, and may be equally applied to systems conforming to other standards. In particular, the present disclosure is applicable to 3GPP NR (5th generation mobile communication standard). In addition, the present disclosure provides intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety related services) based on 5G communication technology and IoT related technology. etc.) can be applied.

Hereinafter, the present disclosure relates to an apparatus and method for managing a soft buffer in a wireless communication system. Specifically, the present disclosure relates to a receiver determining a soft buffer for storing a received signal or a modified received signal when a transmitted signal reaches a receiver after channel coding in a wireless communication system, and a transmitting terminal. Describes a technique for determining the parity bits to be transmitted based on the decision for the soft buffer.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.

FIG. 1 is a diagram showing a base station 110, a terminal 120, and a terminal 130 as parts of nodes using a radio channel in a wireless communication system. Although FIG. 1 shows only one base station, other base stations identical or similar to the base station 110 may be further included.

Base station 110 is a network infrastructure that provides wireless access to terminals 120 and 130 . The base station 110 has coverage defined as a certain geographical area based on a distance over which signals can be transmitted. The base station 110 includes 'access point (AP)', 'eNodeB (eNB)', '5G node (5th generation node)', 'next generation nodeB (next generation nodeB)' in addition to the base station. , gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms having equivalent technical meaning.

Each of the terminal 120 and terminal 130 is a device used by a user and communicates with the base station 110 through a radio channel. A link from the base station 110 to the terminal 120 or terminal 130 is downlink (DL), and a link from the terminal 120 or terminal 130 to the base station 110 is uplink (UL) ) is referred to as Also, the terminal 120 and the terminal 130 may perform communication through a mutual wireless channel. In this case, a device-to-device link (D2D) between the terminal 120 and the terminal 130 is referred to as a sidelink, and the sidelink may be used interchangeably with the PC5 interface. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without user intervention. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the terminal 120 and terminal 130 is a 'user equipment (UE)', a 'mobile station', a 'subscriber station', a 'remote terminal' other than a terminal. )', 'wireless terminal', 'user device', or other terms having an equivalent technical meaning.

The base station 110, terminal 120, and terminal 130 may transmit and receive wireless signals in a mmWave band (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz). At this time, in order to improve the channel gain, the base station 110, the terminal 120, and the terminal 130 may perform beamforming. Here, beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may give directivity to a transmitted signal or a received signal. To this end, the base station 110 and the terminals 120 and 130 may select serving beams 112, 113, 121 and 131 through a beam search or beam management procedure. . After the serving beams 112, 113, 121, and 131 are selected, communication may be performed through a resource having a quasi co-located (QCL) relationship with a resource transmitting the serving beams 112, 113, 121, and 131. there is.

If the large-scale characteristics of the channel carrying the symbol on the first antenna port can be inferred from the channel carrying the symbol on the second antenna port, the first antenna port and the second antenna port are said to be in a QCL relationship. can be evaluated. For example, a wide range of properties are delay spread, doppler spread, doppler shift, average gain, average delay, spatial receiver parameter may include at least one of them.

2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.

The configuration illustrated in FIG. 2 may be understood as a configuration of the base station 110 . Hereinafter, terms such as '??unit' and '??group' refer to a unit that processes at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Referring to FIG. 2 , the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, during data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit string through demodulation and decoding of the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. In addition, the wireless communication unit 210 may include a plurality of transmission and reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit is composed of a plurality of sub-units according to operating power, operating frequency, etc. may consist of The digital unit may be implemented with at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel may be used to mean that the above-described processing is performed by the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts the physical signal received from the other node into a physical signal. convert to bit string

The storage unit 230 stores data such as basic programs for operation of the base station, application programs, and setting information. The storage unit 230 may include volatile memory, non-volatile memory, or a combination of volatile and non-volatile memories. And, the storage unit 230 provides the stored data according to the request of the control unit 240.

The controller 240 controls overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or the backhaul communication unit 220 . Also, the control unit 240 writes and reads data in the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by communication standards. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the controller 240 may include at least one processor. According to an embodiment, the control unit 240 may control the base station to perform operations according to an embodiment to be described later.

3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.

The configuration illustrated in FIG. 3 may be understood as a configuration of the terminal 120 . Hereinafter, terms such as '??unit' and '??group' refer to a unit that processes at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

Referring to FIG. 3 , the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream by demodulating and decoding the baseband signal. In addition, the communication unit 310 up-converts the baseband signal into an RF band signal, transmits the signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. Also, the communication unit 310 may include multiple RF chains. Furthermore, the communication unit 310 may perform beamforming.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitting unit', a 'receiving unit' or a 'transceiving unit'. In addition, in the following description, transmission and reception performed through a wireless channel may be used to mean that the above-described processing is performed by the communication unit 310.

The storage unit 320 stores data such as basic programs for operation of the terminal, application programs, and setting information. The storage unit 320 may include volatile memory, non-volatile memory, or a combination of volatile and non-volatile memories. And, the storage unit 320 provides the stored data according to the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310 . Also, the control unit 330 writes and reads data in the storage unit 320 . Also, the control unit 330 may perform protocol stack functions required by communication standards. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to an embodiment, the controller 330 may control the terminal to perform operations according to an embodiment to be described later.

4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.

FIG. 4 is a diagram showing a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 is a diagram showing components for performing beamforming as part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 .

Referring to FIG. 4, the wireless communication unit 210 or the communication unit 310 includes an encoding and modulation unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, or analog A beamformer 408 is included.

The encoding and modulation unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulation unit 402 generates modulation symbols by performing constellation mapping.

The digital beamformer 404 performs beamforming on digital signals (eg, modulation symbols). To this end, the digital beamformer 404 multiplies modulation symbols by beamforming weights. Here, beamforming weights are used to change the amplitude and phase of a signal, and may be referred to as a 'precoding matrix' or a 'precoder'. The digital beamformer 404 outputs digital beamformed modulation symbols to a plurality of transmission paths 406-1 to 406-N. In this case, according to a multiple input multiple output (MIMO) transmission technique, modulation symbols may be multiplexed or the same modulation symbols may be provided to multiple transmission paths 406-1 to 406-N.

Multiple transmit paths 406-1 through 406-N convert digital beamformed digital signals to analog signals. To this end, each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a DAC, and an up-conversion unit. The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) method, and may be excluded when another physical layer method (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide independent signal processing processes for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406-1 to 406-N may be used in common.

The analog beamformer 408 performs beamforming on an analog signal. To this end, the digital beamformer 404 multiplies analog signals by beamforming weights. Here, beamforming weights may be used to change the magnitude and phase of a signal. Specifically, the analog beamformer 440 may be configured in various ways according to the plurality of transmission paths 406-1 to 406-N and a connection structure between antennas. For example, each of the plurality of transmit paths 406-1 through 406-N may be coupled with one antenna array. As another example, multiple transmit paths 406-1 through 406-N may be coupled with one antenna array. As another example, multiple transmit paths 406-1 through 406-N may be adaptively coupled with one antenna array or coupled with two or more antenna arrays.

The wireless communication system has moved away from providing voice-oriented services in the early days and, for example, 3GPP's high speed packet access (HSPA), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-A (advanced), HRPD (high rate packet data) of 3GPP2, UMB (ultra mobile broadband), and IEEE's 802.16e communication standards such as high-speed, high-quality packet data services are evolving into broadband wireless communication systems. . In addition, as a 5G wireless communication system, a communication standard of 5G or new radio (NR) is being created.

The NR system employs an orthogonal frequency division multiplexing (OFDM) method in downlink (DL) and uplink. More specifically, a cyclic-prefix OFDM (CP-OFDM) scheme is employed in downlink and a discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme along with CP-OFDM in uplink. Uplink refers to a radio link in which a terminal transmits data or a control signal to a base station, and downlink refers to a radio link in which a base station transmits data or a control signal to a terminal. In the multiple access method, data or control information of each user is usually distinguished by assigning and operating time-frequency resources to carry data or control information for each user so as not to overlap each other, that is, to establish orthogonality.

The NR system employs a hybrid automatic repeat request (HARQ) method for retransmitting corresponding data in a physical layer when decoding failure occurs in initial transmission. According to the HARQ scheme, when the receiver fails to accurately decode data, the receiver transmits a negative acknowledgment (NACK), which is information informing the transmitter of the decoding failure, so that the transmitter can retransmit the corresponding data in the physical layer. . The receiver can improve data reception performance by combining the data retransmitted by the transmitter with previously failed decoding data. In addition, when the receiver accurately decodes data, the transmitter can transmit new data by transmitting acknowledgment (ACK), which is information informing the transmitter of successful decoding.

5 is a diagram illustrating a resource structure in a time-frequency domain in a wireless communication system according to an embodiment of the present disclosure.

5 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in downlink or uplink.

In FIG. 5 , 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 502 are gathered to form one slot 506. The length of the subframe is defined as 1.0 ms, and the length of the radio frame 514 is defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of a total of N _BW subcarriers 504 . Specific values such as N _symb and N _BW may be variably applied depending on the system.

A basic unit of resources in the time-frequency domain is a resource element (hereinafter referred to as 'RE') 512, which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or physical resource block, hereinafter 'PRB') 508 consists of N symb consecutive OFDM symbols 502 in the time domain and _{N RB consecutive} subcarriers 510 in the frequency domain. is defined Accordingly, one RB 508 includes N _symb ХN _RB REs 512 . In general, the minimum transmission unit of data is an RB. In an NR system, generally N _symb =14, N _RB =12, and N _BW and N _RB are proportional to the bandwidth of the system transmission band. A data rate may increase in proportion to the number of RBs scheduled for the UE. In the NR system, in the case of a frequency division duplex (FDD) system in which downlink and uplink are operated by dividing into frequencies, a downlink transmission bandwidth and an uplink transmission bandwidth may be different from each other. The channel bandwidth represents a radio frequency (RF) bandwidth corresponding to a system transmission bandwidth. [Table 1] and [Table 2] show the correspondence between system transmission bandwidth, subcarrier spacing (SCS) and channel bandwidth defined in NR systems in frequency bands lower than 6 GHz and higher than 6 GHz represents part of For example, in an NR system having a channel bandwidth of 100 MHz with a subcarrier spacing of 30 kHz, the transmission bandwidth consists of 273 RBs. In [Table 1] and [Table 2], N/A may be a bandwidth-subcarrier combination not supported by the NR system.

[Table 1]

[Table 2]

In the NR system, scheduling information for downlink data or uplink data may be transmitted from a base station to a terminal through downlink control information (DCI). DCI is defined in various formats, and according to each format, whether it is an uplink grant, which is scheduling information for uplink data, or a downlink grant, which is scheduling information for downlink data, and the size of control information Whether it is a small compact DCI, whether spatial multiplexing using multiple antennas is applied, whether it is a DCI for power control, and the like can be determined. For example, DCI format 1-1, which is scheduling control information for downlink data, may include at least one of the items shown in [Table 3] below.

[Table 3]

In [Table 3], in the case of PDSCH transmission, time domain resource assignment is represented by information about a slot through which the PDSCH is transmitted, a start symbol position S in the corresponding slot, and the number of symbols L to which the PDSCH is mapped. can Here, S may be a relative position from the start of the slot, L may be the number of consecutive symbols, and S and L are start and length indicator values defined as shown in [Table 4] below. SLIV) can be determined.

[Table 4]

In an NR system, information on a correspondence relationship between an SLIV value, a PDSCH or physical uplink shared channel (PUSCH) mapping type, and information on a slot through which PDSCH or PUSCH is transmitted is generally configured in one row through RRC configuration ( can be configured). Thereafter, by indicating an index value defined in the configured correspondence relationship using time domain resource allocation of DCI, the base station informs the terminal of the SLIV value, PDSCH or PUSCH mapping type, information on the slot through which the PDSCH or PUSCH is transmitted can deliver.

In the case of an NR system, PDSCH or PUSCH mapping types are defined as type A and type B. In the case of PDSCH or PUSCH mapping type A, a demodulation reference signal (DMRS) symbol starts at a second or third OFDM symbol in a slot. In the case of PDSCH or PUSCH mapping type B, a DMRS symbol starts from the first OFDM symbol of time domain resources allocated for PUSCH transmission.

DCI may be transmitted in a physical downlink control channel (PDCCH) that is a downlink control channel after channel coding and modulation. PDCCH may also be used to refer to control information itself rather than a channel. In general, DCI is scrambled using a specific radio network temporary identifier (RNTI) or terminal identifier independently for each terminal, and after adding a cyclic redundancy check (CRC) and channel coding, each is composed of independent PDCCHs and transmitted. can The PDCCH may be mapped to a control resource set (CORESET) configured for the UE.

Downlink data can be transmitted on PDSCH, which is a physical channel for downlink data transmission. The PDSCH may be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position in the frequency domain and a modulation method may be indicated by DCI transmitted through the PDCCH. Among the control information constituting the DCI, the base station notifies the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (eg, transport block size (TBS)) to the terminal through the MCS. In one embodiment, the MCS It may consist of 5 bits or more or less bits TBS corresponds to a size before channel coding for error correction is applied to a transport block (TB), which is data that the base station wants to transmit.

In the present disclosure, a transport block (TB) may include a medium access control (MAC) header, a MAC CE, one or more MAC service data units (SDUs), and padding bits. Alternatively, TB may indicate a unit of data or a MAC protocol data unit (PDU) that is transmitted from the MAC layer to the physical layer.

The modulation schemes supported by the NR system are quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, and 256 QAM, and each modulation order (Qm) is 2, 4, 6 or may be 8 That is, 2 bits per symbol can be transmitted in the case of QPSK, 4 bits per symbol in the case of 16 QAM, 6 bits per symbol in the case of 64 QAM, 8 bits per symbol can be transmitted in the case of 256 QAM, and 1024 When QAM is supported, 10 bits per symbol of 1024 QAM may be mapped and transmitted.

In terms of services, the NR system is designed to allow various services to be freely multiplexed in time and frequency resources, and accordingly, waveform/numerology, reference signals, etc. can be freely adjusted. In order to provide optimal services to terminals in wireless communication, it is important to optimize data transmission through measurement of channel quality and interference amount, and accordingly, accurate measurement of channel conditions is essential. However, unlike 4G communication in which channel and interference characteristics do not vary greatly depending on frequency resources, in the case of 5G channels, channel and interference characteristics vary greatly depending on service. Support for a subset of is required. Meanwhile, the NR system may classify supported service types into enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). eMBB is a high-speed transmission of high-capacity data, mMTC is a service aimed at minimizing terminal power and accessing multiple terminals, and URLLC is a service that aims for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal. Examples of resource distribution of each service are shown in FIGS. 6A and 6B. Referring to FIGS. 6A and 6B , a scheme in which frequency and time resources are allocated for information transmission in each system can be confirmed.

6A is a diagram illustrating an example of allocating data for each service to frequency-time resources in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 6A , resources may be allocated for an eMBB 622 , URLLCs 612 , 614 , and 616 , and mMTC 632 in an overall system frequency band 610 . If URLLC (612, 614, 616) data is generated while eMBB (622) data and mMTC (632) data are allocated and transmitted in a specific frequency band, the already allocated for eMBB (622) and mMTC (632) URLLC (612, 614, 616) data may be transmitted without emptying the part or not transmitting the eMBB (622) data and mMTC (632). Since URLLC requires reduction of delay time, a portion of the resources allocated to the eMBB 622 may be allocated to URLLCs 612, 614, and 616 to transmit data. Of course, when the URLLCs 612, 614, and 616 are additionally allocated and transmitted in the resource to which the eMBB 622 is allocated, the eMBB 622 data may not be transmitted in the overlapping frequency-time resource, and thus, the eMBB ( 622) Data transmission performance may be lowered. That is, in this case, data transmission failure of the eMBB 622 may occur due to allocation of resources for the URLLCs 612, 614, and 616. The scheme shown in FIG. 6A may be referred to as a preemption scheme.

6B is a diagram illustrating another example of allocating data for each service to frequency-time resources in a wireless communication system according to an embodiment of the present disclosure.

FIG. 6B is a diagram illustrating an embodiment in which each service is provided in each of subbands 662, 664, and 666 in which the entire system frequency band 660 is divided. Specifically, subband 662 may be used for URLLC (672, 674, 576) data transmission, subband 664 may be used for eMBB (682) data transmission, and subband 666 may be used for mMTC (692) data transmission. . Information related to the configuration of the subbands 662, 664, and 666 may be determined in advance, and the information may be transmitted from the base station to the terminal through upper signaling. Alternatively, the base station or the network node may arbitrarily divide information related to the subbands 662, 664, and 666 without transmitting separate subband configuration information to the terminal and provide corresponding services.

According to an embodiment, the length of a transmission time interval (TTI) used for URLLC transmission may be shorter than the length of a TTI used for eMBB or mMTC transmission. In addition, a response of information related to URLLC can be transmitted faster than eMBB or mMTC, and thus, a terminal using the URLLC service can transmit and receive information with a low delay response. In order to transmit the above three services or data, the structure of a physical layer channel used for each type may be different. For example, at least one of a TTI length, a frequency resource allocation unit, a control channel structure, and a data mapping method may be different from each other.

Although the above three services and three data types have been described, more types of services and corresponding data types may exist. Even in this case, various embodiments described below may be implemented.

7 is a diagram illustrating an encoding method of data in a wireless communication system according to an embodiment of the present disclosure.

7 is a diagram illustrating that one TB is segmented into several codeblocks (CBs) and a CRC is added.

Referring to FIG. 7, a CRC 714 may be added to the rear end or front end of one TB 712 to be transmitted in uplink or downlink. The CRC 714 may have 16-bits, 24-bits, or a pre-fixed number of bits, or may have a variable number of bits according to channel conditions, etc., and may be used by a receiver to determine whether channel coding is successful. A block to which the TB 712 and the CRC 714 are added may be divided into a plurality of CBs 722-1, 722-2, 722-(N-1), and 722-N. CBs can be divided into predefined sizes, in which case the last CB 722-N is smaller in size than the other CBs, or by adding 0, a random value, or 1 to have the same length as the other CBs. can be configured. CRCs 732-1, 732-2, 732-(N-1), and 732-N may be added to each of the divided CBs. The CRCs 732-1, 732-2, 732-(N-1), and 732-N may have 16 bits or 24 bits or a pre-fixed number of bits, and the receiver determines whether channel coding is successful. can be used for

The TB 712 and a cyclic generator polynomial may be used to generate the CRC 714. Cyclic generator polynomials can be defined in various ways. For example, the recursive generation polynomial for a 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, for TB data a ₀ ,a ₁ ,a ₂ ,a ₃ ,??,a _A-1 , CRC p ₁ ,p ₂ ,??, p _L-1 is a ₀ D ^A+23 +a ₁ D ^A+22 +??+a _A-1 D ²⁴ +p ₀ D ²³ +p ₁ D ²² +??+p ₂₂ D ¹ +p ₂₃ It can be determined by dividing by g _CRC24A (D) so that the remainder is 0. In the example above, the CRC length L is described as being 24, but the length L may be defined differently, such as 12, 16, 24, 32, 40, 48, or 64.

After adding CRC to TB as described above, the sum of TB and CRC may be divided into N CBs 722-1, 722-2, 722-(N-1), 722-N. CRCs 732-1, 732-2, 732-(N-1), and 732-N are added to the CBs 722-1, 722-2, 722-(N-1), and 722-N, respectively. can The CRC added to each CB may be generated based on a CRC of a different length or another cyclic generation polynomial than when generating the CRC added to the TB. However, according to another embodiment, the CRC 714 added to the TB and the CRCs 732-1, CBs 722-1, 722-2, 722-(N-1), and 722-N 732-2, 732-(N-1), and 732-N) may be omitted depending on the type of channel code to be applied to the CB. For example, when a low density parity code (LDPC) code is applied to a CB instead of a turbo code, CRCs 732-1, 732-2, 732-(N-1), and 732-N added for each CB can be omitted. However, even when LDPC is applied, the CRCs 732-1, 732-2, 732-(N-1), and 732-N are CBs 732-1, 732-2, and 732-(N-1). ), 732-N). Also, even when a polar code is used, a CRC may be added or omitted.

As shown in FIG. 7, the maximum length of one CB is determined according to the type of channel coding applied to the TB, and the TB and the CRC added to the TB can be divided into CBs according to the maximum length of the CB. there is. In the LTE system, the CRC for the CB is added to the divided CB, and the data bits and CRC of the CB are encoded with a channel code. The number of bits that are rate matched together may be determined.

8 is a diagram illustrating mapping of synchronization signals and broadcast channels in a wireless communication system according to an embodiment of the present disclosure.

8 is a diagram illustrating an example of a mapping result in frequency and time domains of synchronization signals and a physical broadcast channel (PBCH) of a 3GPP NR system. A primary synchronization signal (PSS) 802, a secondary synchronization signal (SSS) 806, and a PBCH 804 are mapped over 4 OFDM symbols, and the PSS 802 and SSS ( 806) may be mapped to 12 RBs, and PBCH 804 may be mapped to 20 RBs. The frequency bandwidth of 20 RBs according to subcarrier spacing (SCS) is shown in FIG. 8. A set of PSS 802, SSS 806, and PBCH 804, or a resource region carrying PSS 802, SSS 806, and PBCH 804 is referred to as an SS/PBCH block (SS block, SSB). can be referred to.

9 is a diagram illustrating an example of SSB arrangement in a wireless communication system according to an embodiment of the present disclosure.

9 is a diagram showing an example of an LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz, as examples of symbols to which one SSB is mapped in a slot. Referring to FIG. 9, SSBs of the NR system at locations 902, 904, 906, and 908 that do not overlap with cell-specific reference signals (CRSs) always transmitted in the LTE system 912, 914, 916, 918) may be transmitted. The design of FIG. 9 may be to allow the LTE system and the NR system to coexist in one frequency band.

10A and 10B are diagrams illustrating transmittable symbol positions of SSBs according to subcarrier intervals in a wireless communication system according to an embodiment of the present disclosure. FIG. 10A is a diagram illustrating symbol positions at which SSBs can be transmitted within a 1 ms interval, and FIG. 10B is a diagram illustrating symbol positions within a 5 ms interval. In the area where the SSB shown in FIGS. 10A and 10B can be transmitted, the SSB does not always have to be transmitted, and the SSB may or may not be transmitted according to the selection of the base station.

In a wireless communication system according to an embodiment, the size of a TB may be calculated through the following steps.

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 N_RE가 계산될 수 있다. N_RE는

로 계산되며, n_PRB는 단말에게 할당된 PRB 수를 나타낸다. Step 1: Calculate N' _RE , which is the number of REs allocated to PDSCH mapping in one PRB in the allocated resource. _N'RE is

can be calculated as From here,

is 12,

may indicate the number of OFDM symbols allocated to the PDSCH.

is the number of REs in one PRB occupied by DMRSs of the same CDM group.

is the number of REs occupied by overhead in the PRB as long as it is set by higher signaling, and can be set to one of 0, 6, 12, and 18. Then, the total number of REs N _RE allocated to the PDSCH may be calculated. N _RE is

It is calculated as , and n _PRB represents the number of PRBs allocated to the UE.

로 계산될 수 있다. 여기에서, R은 코드 레이트이며, Q_m은 변조 오더 (modulation order)이며, 이 값의 정보는 DCI의 MCS 비트필드와 미리 약속된 표를 이용하여 전달될 수 있다. 또한, v는 할당된 레이어의 수이다. 만약 N_info≤3824이면, 하기의 단계 3을 통해 TBS가 계산될 수 있다. 이외에는 단계 4를 통해 TBS가 계산될 수 있다. Step 2: The number of temporary information bits N _info is

can be calculated as Here, R is a code rate, Q _m is a modulation order, and information of this value can be transmitted using the MCS bit field of DCI and a prearranged table. Also, v is the number of allocated layers. If N _info ≤3824, TBS may be calculated through step 3 below. Otherwise, TBS may be calculated through step 4.

와

의 수식을 통해 N'_info가 계산될 수 있다. TBS는 하기 표 5에서 N'_info보다 작지 않은 값 중 N'_info에 가장 가까운 값으로 결정될 수 있다. Step 3:

and

N' _info can be calculated through the formula of TBS may be determined as a value closest to _N'info among values not smaller than _N'info in Table 5 below.

[Table 5]

와

의 수식을 통해 N'_info가 계산될 수 있다. TBS는 N'_info 값과 하기 표 6의 pseudo-code 를 통해 결정될 수 있다. 아래에서 C는 한 TB가 포함하는 코드블록의 수에 해당한다.Step 4:

and

N' _info can be calculated through the formula of TBS can be determined through the N' _info value and the pseudo-code in Table 6 below. Below, C corresponds to the number of code blocks included in one TB.

[Table 6]

When one CB is input to the LDPC encoder, parity bits may be added and output. In this case, the size of parity bits may vary according to the LDPC base graph. According to a rate matching method, all parity bits generated by LDPC coding may be transmittable or only partially transmittable. The method of processing all parity bits generated by LDPC coding to be transmittable is called 'FBRM (full buffer rate matching)', and the method of limiting the number of transmittable parity bits is 'LBRM (limited buffer rate matching)' is referred to as When a resource is allocated for data transmission, an LDPC encoder output is input to a circular buffer, and bits of the buffer may be repeatedly transmitted as many times as the allocated resource.

로 주어지며, R_LBRM은 2/3으로 결정될 수 있다. TBS_LBRM을 구하기 위해서는 전술한 TBS를 구하는 방법을 이용하되, 해당 셀에서 단말이 지원하는 최대 레이어 수 및 최대 변조 오더를 가정하며, 최대 변조 오더 Q_m는 해당 셀에서 적어도 하나의 BWP에 대해 256QAM을 지원하는 MCS 테이블을 사용하도록 설정된 경우 8, 설정되지 않았을 경우에는 6(64QAM)으로 가정되고, 코드 레이트는 최대 코드레이트인 948/1024으로 가정되며, N_RE는

로 가정되고 n_PRB는 n_PRB,LBRM으로 가정되어 계산된다. n_PRB,LBRM는 하기의 표 7로 주어질 수 있다. If the number of all parity bits generated by LDPC coding is N, then N _cb = N in the FBRM method. In the LBRM method, N _cb becomes min(N, N _ref ), and N _ref is

, and R _LBRM can be determined as 2/3. In order to obtain the TBS _LBRM , the above-described method for obtaining the TBS is used, but the maximum number of layers and maximum modulation order supported by the terminal in the cell are assumed, and the maximum modulation order Q _m is 256QAM for at least one BWP in the cell If the supported MCS table is set to use, 8 is assumed, if not set, 6 (64QAM) is assumed, the code rate is assumed to be the maximum code rate of 948/1024, and N _RE is

, and n _PRB is calculated assuming n _PRB,LBRM . n _PRB,LBRM can be given in Table 7 below.

[Table 7]

In a wireless communication system according to an embodiment, the maximum data rate supported by the terminal may be determined through Equation 1 below.

[Equation 1]

는 최대 레이어 수,

는 최대 변조 오더, f^(j)는 스케일링 지수, μ 는 부반송파 간격을 의미할 수 있다. f^(j)는 1, 0.8, 0.75, 0.4 중 하나의 값을 단말이 보고할 수 있으며, μ는이하 [표 8]과 같이 주어질 수 있다. In [Equation 1], J is the number of carriers bound by carrier aggregation, R _max = 948/1024,

is the maximum number of layers,

is a maximum modulation order, f ^(j) is a scaling index, and μ is a subcarrier spacing. For f ^(j) , one of 1, 0.8, 0.75, and 0.4 may be reported by the terminal, and μ may be given as shown in [Table 8] below.

[Table 8]

는 평균 OFDM 심볼 길이이며,

는

로 계산될 수 있고,

는 BW(j)에서 최대 RB 수이다. OH^(j)는 오버헤드 값으로, FR1 (6 GHz 이하 또는 7.125GHz 이하 대역)의 하향링크에서는 0.14, 상향링크에서는 0.18로 주어질 수 있으며, FR2 (6 GHz 초과 또는 7.125 GHz 초과 대역)의 하향링크에서는 0.08, 상향링크에서는 0.10로 주어질 수 있다. 수학식 1를 통해 30 kHz 부반송파 간격에서 100 MHz 주파수 대역폭을 갖는 셀에서의 하향링크에서의 최대 데이터율은 하기의 표 9로 계산될 수 있다. also,

is the average OFDM symbol length,

Is

can be calculated as,

is the maximum number of RBs in BW(j). OH ^(j) is an overhead value, which can be given as 0.14 in downlink of FR1 (band below 6 GHz or below 7.125 GHz) and 0.18 in uplink, and downlink of FR2 (band above 6 GHz or above 7.125 GHz) It may be given as 0.08 in , and as 0.10 in uplink. Through Equation 1, the maximum data rate in downlink in a cell having a frequency bandwidth of 100 MHz in a 30 kHz subcarrier interval can be calculated from Table 9 below.

[Table 9]

On the other hand, the actual data rate that can be measured in actual data transmission by the terminal may be a value obtained by dividing the amount of data by the data transmission time. This may be a value obtained by dividing the sum of TBS (TB size) in 1 TB transmission or the TTI length in 2 TB transmission. For example, the maximum actual data rate in downlink in a cell having a frequency bandwidth of 100 MHz at a subcarrier interval of 30 kHz may be determined as shown in Table 10 according to the number of allocated PDSCH symbols.

[Table 10]

The maximum data rate supported by the terminal can be confirmed through [Table 9], and the actual data rate according to the allocated TBS can be confirmed through [Table 10]. In this case, there may be a case where the actual data rate is greater than the maximum data rate according to scheduling information.

In a wireless communication system, in particular, a NR system, a data rate that a terminal can support may be preset between a base station and a terminal. The data rate may be calculated using the maximum frequency band supported by the terminal, the maximum modulation order, and the maximum number of layers. However, the calculated data rate may be different from a value calculated from the transport block size (TBS) and transmission time interval (TTI) length used for actual data transmission. Accordingly, the terminal can be allocated a TBS larger than the value corresponding to the data rate supported by the terminal, and to prevent this, there may be restrictions on the TBS that can be scheduled according to the 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 addition, when LBRM is applied in the communication system defined in the current NR, TBS _LBRM is determined based on the number of layers or rank supported by the terminal, but the process is inefficient or the parameter configuration is ambiguous, Alternatively, there is a problem in that it is difficult to stably apply LBRM in the terminal. Hereinafter, the present disclosure describes various embodiments capable of solving this problem.

11 is a diagram illustrating an example of generation and transmission of parity bits in a wireless communication system.

11 is a diagram illustrating an example of a process of dividing data to be transmitted into code blocks, generating parity bits by applying channel coding to the divided CBs, and determining and transmitting parity bits to be transmitted.

Referring to FIG. 11 , one CB may be transmitted to a channel encoder 1102, and data bits 1112 and parity bits 1114 and 1116 may be generated by the channel encoder 1102. For example, the channel encoder 1102 can perform encoding using LDPC, polar codes, or other channel codes. In this case, the amount of parity bits generated may vary according to the type and details of the channel code. If the total length of the bits 1110 generated by the encoding of the channel encoder 1102 is N bits, when all parity bits 1114 and 1116 are transmitted, the receiver can store N bits of received information A soft buffer or memory may be required. If the receiver uses a soft buffer smaller than N bits in size, reception performance may deteriorate.

로 주어지는 방법으로, 송신 가능한 패리티 비트들이 제한될 수 있다. 이와 같이, 전송 가능한 패리티 비트 개수에 제한을 두는 방식은 'LBRM(limited buffer rate matching)'로 지칭된다. In order to reduce the size of the required soft buffer, a method of determining parity bits 1116 that are not transmitted and not transmitting the determined parity bits 1116 may be used. That is, only the data bits 1112 and some parity bits 1114 are input to the transmit buffer 1120 and transferred to the soft buffer 1130 so that they can be transmitted. That is, transmittable parity bits may be limited, and the limited amount is the sum of the size of the data bits 1112 and the size of some of the parity bits 1114, and may be referred to as N _cb . If N _cb is N, it means that parity bits that can be transmitted are not limited, which means that all parities generated as channel codes can be transmitted and received without restriction within allocated resources. In this way, a method of processing all parity bits to be transferable may be referred to as full buffer rate matching (FBRM). On the other hand, N _cb is determined as N _cb =min(N,N _ref ),

With the method given by , transmittable parity bits may be limited. As such, the method of limiting the number of transmittable parity bits is referred to as 'limited buffer rate matching (LBRM)'.

In embodiments described below, a base station is a subject that performs resource allocation of a terminal, and may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication. That is, a base station may mean a gNB, an eNB, a road site unit (RSU), or a fixed station. A terminal is not only a general UE and a mobile station, but also a vehicle supporting vehicle-to-vehicular (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication, or a pedestrian vehicle. A handset (e.g. smartphone), a vehicle supporting vehicle-to-network (V2N) communication or a vehicle-to-infrastructure (V2I) communication, and It may be one of an RSU equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function.

In a V2X environment, data may be transmitted from one terminal to a plurality of terminals, or data may be transmitted from one terminal to one terminal. Alternatively, data may be transmitted from the base station to a plurality of terminals. However, the present disclosure is not limited thereto and may be applied to various cases.

In order for a UE to transmit/receive in a sidelink, the UE operates based on a resource pool previously defined or configured between UEs. A resource pool may be a set of frequency and time domain resources that can be used for transmitting and receiving sidelink signals. That is, in order to transmit and receive sidelink signals, transmission and reception of sidelink signals must be performed in predetermined frequency-time resources, and such resources are defined as resource pools. A resource pool may be defined for each of transmission and reception, and may be commonly defined and used for transmission and reception. In addition, terminals may be configured with one or a plurality of resource pools and transmit/receive sidelink signals. Configuration information on the resource pool used for sidelink transmission and reception and other configuration information for the sidelink are pre-installed when the terminal is produced, configured from the current base station, or other configuration information prior to access to the current base station. It may be pre-configured from a base station or another network unit, or a fixed value, or provisioned from a network, or self-constructed.

In order to indicate the frequency domain resources of the resource pool, the base station may indicate the start index and length (eg, number of PRBs) of PRBs belonging to the resource pool, but is not limited thereto, and by indicating PRBs using a bitmap, one of resource pools can be configured. In addition, in order to indicate time domain resources of the resource pool, the base station may indicate indexes of OFDM symbols or slots belonging to the resource pool in units of bitmaps. Alternatively, according to another method, the system may use a formula in a set of specific slots to define slots satisfying the formula to belong to the corresponding resource pool. In configuring the time domain resources, for example, the base station may use a bitmap to inform which slots among the slots for a specific time belong to a specific resource pool. At this time, the resource pool of the time resource corresponds to the specific time Whether or not it is performed may be indicated according to a bitmap.

Meanwhile, a subchannel may be defined as a resource unit on a frequency including a plurality of RBs. For example, a subchannel may be defined as an integer multiple of RB. The size of a subchannel may be set to be the same or different for each subchannel, and one subchannel is generally composed of consecutive PRBs, but there is no limitation that it must be composed of consecutive PRBs. A subchannel may be a basic unit of resource allocation for a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH). Accordingly, the size of the subchannel may be set differently depending on whether the corresponding channel is PSSCH or PSCCH. In addition, the term subchannel may be replaced with other terms such as a resource block group (RBG), a set of RBGs, or a set of PRBs.

For example, 'startRBSubchannel', which is higher level signaling or configuration information, may indicate a start position of a subchannel on a frequency in a resource pool. For example, in an LTE V2X system, a resource block, which is a frequency resource belonging to a resource pool for PSSCH, may be determined in the same manner as in [Table 11] below.

[Table 11]

For resource pool configuration, a granularity of resource allocation in the time domain may be a slot. In the present disclosure, the resource pool is exemplified as a slot allocated non-contiguously in time, but the resource pool may be allocated contiguously in time, or it may be possible to set it in a symbol unit or a unit consisting of a plurality of symbols (eg, mini-slot). can

은 이하 [표 12]와 같은 방법으로 결정될 수 있다. As another example, when 'startSlot', which is upper signaling or configuration information, indicates the start position of a slot in time in a resource pool, subframes that are time resources belonging to a resource pool for PSSCH in an LTE V2X system

can be determined in the same way as in [Table 12] below.

[Table 12]

According to the procedure of [Table 12], a slot is included in the resource pool except for at least one slot used for downlink among the slots (subframes in [Table 14]) for a specific period as a bitmap. Whether or not a slot is actually included in the resource pool and used for sidelink transmission and reception may be indicated according to the bitmap information among slots indicated to belong to the resource pool.

The sidelink control channel may be referred to as a physical sidelink control channel (PSCCH), and the sidelink shared channel or data channel may be referred to as a physical sidelink shared channel (PSSCH). Also, a broadcast channel broadcast together with a synchronization signal may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel for transmitting feedback may be referred to as a physical sidelink feedback channel (PSFCH). However, PSCCH or PSSCH may be used for feedback transmission. Depending on the communication system, the aforementioned channels may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, NR-PSSCH, and the like. In the present disclosure, a side link may mean a link between terminals, and a Uu link may mean a link between a base station and a terminal.

The information transmitted in the sidelink includes sidelink control information (SCI), sidelink feedback control information (SFCI), sidelink channel state information (SCSI), and transport channel information. In sidelink shared channel (sidelink shared channel, SL-SCH) may be included.

The aforementioned information and transport channels may be mapped to physical channels as shown in [Table 13] and [Table 14] below.

[Table 13]

[Table 14]

Alternatively, if SCSI is transmitted through the PSFCH, transport channel-physical channel mapping as shown in [Table 15] and [Table 16] below can be applied.

[Table 15]

[Table 16]

Alternatively, if SCSI is delivered to a higher layer, for example, using MAC CE, higher layer signaling corresponds to SL-SCH, so it can be transmitted through PSSCH, and below [Table 17] and [Table 18] Transport channel-physical channel mapping such as ] may be applied.

[Table 17]

[Table 18]

When the CSI of the sidelink is transmitted through the MAC CE, the receiving terminal may transmit at least one of the following additional information to the transmitting terminal together.

- Information on the slot in which the sidelink CSI-RS used to measure CSI was transmitted, that is, information about the timing at which the sidelink CSI-RS was transmitted

- Information on the frequency domain in which CSI is measured, that is, information on the frequency domain in which the sidelink CSI-RS is transmitted. An index of a subchannel may be included.

- Information of rank indicator (RI) and channel quality indicator (CQI)

- Information on the preferred precoding matrix

- Information about your preferred beamforming

- ID information of the receiving terminal that has received the sidelink CSI-RS

- ID information of the transmitting terminal that transmitted the sidelink CSI-RS

- ID information of a transmitting terminal that transmits sidelink CSI feedback information

- ID information of a receiving terminal receiving sidelink CSI feedback information

12A is a diagram illustrating an example of groupcasting transmission in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 12A, a terminal 1220 transmits common data to a plurality of terminals 1221a, 1221b, 1221c, and 1221d, that is, transmits data in a group casting method. The terminal 1220 and terminals 1221a, 1221b, 1221c, and 1221d may be devices that move like a vehicle. For group casting, at least one of separate control information (eg, sidelink control information (SCI)), a physical control channel (eg, physical sidelink control channel (PSCCH), and data) may be further transmitted.

12B is a diagram illustrating an example of HARQ feedback transmission according to group casting in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 12B, terminals 1221a, 1221b, 1221c, and 1221d that have received common data through group casting transmit information indicating success or failure in data reception to the terminal 1220 that has transmitted the data. Information indicating success or failure of data reception may include HARQ-ACK feedback. Data transmission and feedback operations as shown in FIGS. 12A and 12B are performed based on group casting. However, according to another embodiment, data transmission and feedback operations as shown in FIGS. 12A and 12B may also be applied to unicast transmission.

13 is a diagram illustrating an example of unicasting transmission in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 13 , the first terminal 1320a transmits data to the second terminal 1320b. As another example, the transmission direction of data may be reversed (eg, from the second terminal 1320b to the first terminal 1320a). The other terminals 1320c and 1320d other than the first terminal 1320a and the second terminal 1320b cannot receive data transmitted and received between the first terminal 1320a and the second terminal 1320b in a unicast manner. . Transmission and reception of data through unicast between the first terminal 1320a and the second terminal 1320b is performed by mapping on a preset resource between the first terminal 1320a and the second terminal 1320b or scrambling using a preset value. or may be transmitted using a preset value. Alternatively, control information related to data through unicast between the first terminal 1320a and the second terminal 1320b may be mapped to each other in a preset manner. Alternatively, transmission and reception of data through unicast between the first terminal 1320a and the second terminal 1320b may include an operation of checking each other's unique ID. Terminals may be devices that move like vehicles. For unicast, at least one of separate control information, a physical control channel, and data may be further transmitted.

14A is a diagram illustrating an example of sidelink data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.

14A is a diagram illustrating mode 1, which is a scheme in which a terminal receiving scheduling information from a base station transmits sidelink data. Although this disclosure refers to a method of performing sidelink communication based on scheduling information as mode 1, it may be referred to as another name. Referring to FIG. 14A, a terminal 1420a (hereinafter referred to as a 'transmitting terminal') desiring to transmit data on a sidelink receives scheduling information for sidelink communication from a base station 1410. Upon receiving the scheduling information, the transmitting terminal 1420a transmits sidelink data to another terminal 1420b (hereinafter referred to as a 'receiving terminal') based on the scheduling information. Scheduling information for sidelink communication is included in DCI, and the DCI may include at least one of the items shown in [Table 19] below.

[Table 19]

Scheduling may be performed for one-time sidelink transmission, or may be performed for periodic transmission or semi-persistent scheduling (SPS) or configured grant transmission. Scheduling methods can be distinguished by indicators included in DCI or by RNTI or ID values scrambled in CRC added to DCI. To have the same size as other DCI formats such as DCI for downlink scheduling or uplink scheduling, DCI for sidelink transmission may further include padding bits (eg, 0 bits).

The transmitting terminal 1420a receives the DCI for sidelink scheduling from the base station 1410, transmits the PSCCH including the sidelink scheduling information to the receiving terminal 1420b, and then transmits the PSSCH, which is data corresponding to the PSCCH. . PSCCH, which is sidelink scheduling information, includes SCI, and SCI may include at least one of the items shown in [Table 20] below.

[Table 20]

Control information including at least one of the items of [Table 20] may be included in one SCI or two SCIs in order to be delivered to the receiving terminal. A method of dividing and transmitting two SCIs may be referred to as a 2-stage SCI.

14B is a diagram illustrating an example of sidelink data transmission without scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure.

14B is a diagram illustrating mode 2, which is a scheme in which a terminal transmits sidelink data without receiving scheduling information from a base station. Although this disclosure refers to a method of performing sidelink communication without scheduling information as mode 2, it may be referred to by other names. The UE 1420a desiring to transmit data on the sidelink may transmit sidelink scheduling control information and sidelink data to the receiving UE 1420b based on its own judgment without scheduling from the base station. In this case, the SCI of the same format as the SCI used in mode 1 sidelink communication may be used as the sidelink scheduling control information. For example, the scheduling control information may include at least one of the items shown in [Table 20].

15 is a diagram illustrating an example of a channel structure of a slot used for sidelink communication in a wireless communication system according to an embodiment of the present disclosure. 15 is a diagram illustrating physical channels mapped to slots for sidelink communication. Referring to FIG. 15 , a preamble 1502 may be mapped before the start of a slot, that is, after the previous slot. Then, from the start of the slot, PSCCH 1504, PSSCH 1506, gap 1508, physical sidelink feedback channel (PSFCH) 1510, and gap 1512 may be mapped.

Before transmitting a signal in a corresponding slot, the transmitting terminal transmits a preamble 1502 in one or more symbols. The preamble may be used to enable the receiving terminal to correctly perform automatic gain control (AGC) for adjusting the strength of amplification when amplifying the power of the received signal. Also, the preamble may or may not be transmitted depending on whether the transmitting terminal transmits the previous slot. That is, when the transmitting terminal transmits a signal to the same terminal in a previous slot (eg, slot #n-1) of the corresponding slot (eg, slot #n), transmission of the preamble 1502 may be omitted. The preamble 1502 is 'sync signal', 'sidelink sync signal', 'sidelink reference signal', 'midamble', 'initial signal', 'wake-up signal' or the like. It may be referred to by other terms having equivalent technical meanings.

A PSCCH 1504 including control information is transmitted using symbols transmitted at the beginning of the slot, and a PSSCH 1506 scheduled by the control information of the PSCCH 1504 may be transmitted. PSCCH 1504 may be mapped with at least a part of SCI, which is control information. Thereafter, a GAP 1508 may exist, and PSFCH 1510, which is a physical channel for transmitting feedback information, may be mapped.

The terminal may receive a preset location of a slot capable of transmitting the PSFCH. Receiving preset means that a terminal is pre-determined in the process of being created, or is transmitted when accessing a sidelink-related system, or is transmitted from a base station when accessing a base station, or is received from another terminal.

Referring to FIG. 15, the PSFCH 1510 may be located at the last part of the slot. By securing a gap 1508, which is an empty time of a predetermined time, between the PSSCH 1506 and the PSFCH 1510, the UE transmitting or receiving the PSSCH 1506 prepares for receiving or transmitting the PSFCH 1510 (eg : transmit/receive conversion). After the PSFCH 1510, a gap 1512, which is an empty section for a certain period of time, may exist.

16A is a diagram illustrating a first example of a distribution of feedback channels in a wireless communication system according to an embodiment of the present disclosure.

16A is a diagram illustrating a case in which resources capable of transmitting and receiving a PSFCH are allocated in each slot. In FIG. 16A, an arrow indicates a slot of a PSFCH through which HARQ-ACK feedback information corresponding to the PSSCH is transmitted. Referring to FIG. 16A, HARQ-ACK feedback information for PSSCH 1612 transmitted in slot #n may be transmitted in PSFCH 1614 in slot #n+1. Since the PSFCH is allocated to each slot, the PSFCH may correspond 1:1 with the slot including the PSSCH. For example, if a period of a resource capable of transmitting and receiving a PSFCH is configured by a parameter such as 'periodicity_PSFCH_resource', in the case of FIG. 16A, periodicity_PSFCH_resource indicates 1 slot. Alternatively, the period may be set in units of msec, and may be indicated by a value assigned to each slot according to a subcarrier interval.

16B is a diagram illustrating a second example of a distribution of feedback channels in a wireless communication system according to an embodiment of the present disclosure.

16B is a diagram illustrating a case in which resources are allocated to transmit and receive a PSFCH in every 4 slots. In FIG. 16B, an arrow indicates a slot of a PSFCH through which HARQ-ACK feedback information corresponding to the PSSCH is transmitted. Referring to FIG. 16B, only the last slot among the four slots may include the PSFCH. Similarly, only the last slot of the next 4 slots contains the PSFCH. Accordingly, HARQ-ACK feedback for the PSSCH 1622a of slot #n, the PSSCH 1622b of slot #n+1, the PSSCH 1622c of slot #n+2, and the PSSCH 1622d of slot #n+3 Information may be transmitted on PSFCH 1624 in slot #+4. Here, the slot index may be an index of slots included in the resource pool. That is, the four slots may not actually be physically consecutive slots, but may be consecutively listed slots among slots included in a resource pool (or slot pool) used for sidelink communication between terminals. The reason why the HARQ-ACK feedback information of the PSSCH transmitted in the 4th slot cannot be transmitted in the PSFCH of the same slot may be because the processing time is not short enough for the terminal to finish decoding the PSSCH transmitted in the corresponding slot and transmit the PSFCH in the same slot. there is.

When the UE transmits or receives the PSFCH, the number of HARQ-ACK feedback bits included in the PSFCH must be known so that the transmission or reception can be performed correctly. The number of HARQ-ACK feedback bits included in the PSFCH and the HARQ-ACK bits of which PSSCH are included may be determined based on at least one or a combination of two or more of the items shown in Table 21 below.

[Table 21]

When a resource capable of transmitting the PSFCH is configured or given in slot #n+x, the UE receiving the PSSCH in slot #n uses the smallest x among integers greater than or equal to K to determine the HARQ-ACK feedback of the PSSCH. Information is transmitted using the PSFCH of slot #n+x. K may be a preset value from the transmitting terminal or a value set in a resource pool through which the corresponding PSSCH or PSFCH is transmitted. For the setting of K, each terminal may exchange its own capability information with the transmitting terminal in advance. For example, K may be determined according to at least one of a subcarrier interval, a terminal capability, a setting value with a transmitting terminal, or a resource pool setting.

In Mode2 operation in the NR sidelink system, the transmitting terminal may perform resource selection after sensing without pre-reserving resources for initial transmission of one TB. Meanwhile, as a method of reserving resources for initial transmission, resources can be reserved using SCI for other TBs, and this function can be enabled or disabled by (pre-)configuration (ie, transmission of TB1 SCI1 for controlling can reserve resources for initial transmission of TB2). For example, when the function is enabled, when the previous TB (TB1) is transmitted, reservation interval information is set in SCI1, and the time when the same frequency resource as the resource selected to transmit the previous TB (TB1) is set as the reservation interval It can be reserved for initial transmission of TB2 after an interval.

As another method of reserving initial transmission resources, in addition to the above-mentioned method of reserving resources using SCI to control another TB, a method of reserving initial resources for the corresponding TB using SCI through standalone PSCCH transmission this can be considered.

Also, when initial transmission is performed, retransmission resources for one same TB may be reserved using SCI at the time of initial transmission. At this time, time gap information between initial transmission and retransmission for the same TB and frequency resource allocation information may be included in the SCI and transmitted. In this case, when the same frequency allocation size for initial transmission and retransmission resources for the same TB is always supported (first method) and when different frequency allocation sizes for initial transmission and retransmission resources are allowed (second method) can be considered.

In general, when the frequency allocation sizes for initial transmission and retransmission resources are allowed to be different, there is an advantage in that resource selection can be more flexible. It can become very complex, and the performance of SCI may decrease due to the increase in the number of bits transmitted in SCI (eg, the coverage of SCI may decrease or the reception error rate may increase). On the other hand, if the frequency allocation sizes for initial transmission and retransmission resources are always supported identically, the flexibility for resource allocation is small, but it becomes simple to indicate retransmission resource information in SCI as reservation information for retransmission resources. It has the advantage of guaranteeing the performance of the SCI by reducing the number of bits transmitted through the SCI. Therefore, the above two methods have their respective advantages and disadvantages.

As a method for mutually complementing the advantages and disadvantages of the above two methods, a method in which initial transmission resources are fixed and transmitted through X sub-channels, and retransmission resources for these are transmitted through one or more sub-channels. can be considered For example, consider a method of allowing the frequency allocation size for initial transmission and retransmission resources to be different while supporting a method of indicating reservation for retransmission resources through SCI for one and the same TB in the initial transmission as simply as possible. can According to this method, since the frequency allocation size of the initial transmission resource is always fixed, only the frequency allocation size for the retransmission resource needs to be indicated through the SCI. If more than one retransmission resource is reserved for the same TB, the frequency allocation size of all retransmission resources may be equally limited. Also, a method of limiting the number X of subchannels to one subchannel for an initial transmission resource (ie, limiting X to 1) may be considered. However, the above is only an example, and the value of X is not always limited to 1 in the embodiments of the present disclosure, and the value of X may be variously determined. If the initial transmission resources are transmitted with a fixed value of subchannel X, the PSCCH and the PSSCH are transmitted through X subchannels. At this time, the SCI transmitted through the PSCCH can reserve retransmission resources. Y subchannels may be allocated with a size of .

If the NR sidelink system always supports the same frequency allocation size for initial transmission and retransmission resources for the same TB (hereinafter, the first method), and the initial transmission resources are fixed to X sub-channels Indicates which of the two methods is used with 1-bit information in SCI when two methods (hereinafter, the second method) in which retransmission resources can be transmitted through one or more subchannels are considered It can be. This is to be able to interpret the resource reservation information included in the SCI. Hereinafter, resource reservation information included in SCI is proposed in more detail when these two methods are considered. The following is an example of a method of indicating reservation information for initial transmission and one retransmission resource for a corresponding TB.

17A and 17B are diagrams illustrating an example of a method in which resource allocation of a PSSCH is performed in units of subchannels according to an embodiment of the present disclosure. Referring to FIG. 17A, 17a-10 shows a method of multiplexing a PSCCH and a PSSCH. Referring to FIGS. 17A and 17B , the PSCCH may be transmitted in a subchannel corresponding to the lowest subchannel index among subchannels allocated to the PSSCH. In the NR sidelink, a method in which the PSCCH is always included in a subchannel and transmitted may be considered. In this case, a method of transmitting the PSCCH in the subchannel may be determined according to the size of the configured subchannel. In addition, a method of repeatedly transmitting the PSCCH within the PSSCH region according to the size of the subchannel may be considered (17a-40).

Specifically, a method in which a PSCCH is included in a subchannel and transmitted using the first method in which the frequency allocation size for initial transmission and retransmission resources for the same TB is always supported is the same, as shown in 17a-20 and 17a- of FIG. 17a. 30 is shown. In addition, the PSCCH is included in a sub-channel and transmitted using the second method in which initial transmission resources are fixed and transmitted in X sub-channels, and retransmission resources for these are transmitted in one or more sub-channels. The method is shown at 17b-50 and 17b-60 in FIG. 17B.

Referring to FIGS. 17A and 17B, a UE may receive startRB-Subchannel, sizeSubchannel, and numSubchannel settings as frequency configuration information for a resource pool. First, an example of indicating resource reservation information through SCI when a method in which the same frequency allocation size for initial transmission and retransmission resources for the same TB is always used is used. Specifically, the following method is a chain reservation method indicating resource allocation for current transmission and next retransmission. Resource reservation information for PSSCH indicated by SCI in slot tn allocated to the original pool can be determined as follows:

1) If the time gap (SFgap) between the current transmission and the next retransmission is 0 (no retransmission), the time and frequency allocation positions for the PSSCH are as follows (17a-20)

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +LsubCH-1 in slot tn

2) If the time gap (SFgap) between the current transmission and the next retransmission is not 0 (corresponding to the current transmission), the time and frequency allocation positions for the PSSCH are as follows.

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +LsubCH-1 in slot tn (17a-20)

b) sub-channel(s) nsubCHstart(RE), nsubCHstart(RE) +1,??, nsubCHstart(RE) +LsubCH-1 in slot tn+SFgap (17a-30)

3) If the time gap (SFgap) between the current transmission and the next retransmission is not 0 (corresponding to the next retransmission), the time and frequency allocation positions for the PSSCH are as follows.

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +LsubCH-1 in slot tn-SFgap

b) sub-channel(s) nsubCHstart(RE), nsubCHstart(RE) +1,??, nsubCHstart(RE) +LsubCH-1 in slot tn

The LsubCH indicates the length of a subchannel allocated to the PSSCH, and nsubCHstart and nsubCHstart (RE) indicate start positions of subchannels allocated to the PSSCH for initial transmission and retransmission. nsubCHstart and nsubCHstart (RE) information may be included in SCI.

In contrast, when a method in which initial transmission resources are fixed and transmitted through X sub-channels and retransmission resources for these are transmitted through one or more sub-channels is used, resource reservation information is indicated through SCI. An example is described. Specifically, the following method is a chain reservation method indicating resource allocation for current transmission and next retransmission. Resource reservation information for PSSCH indicated by SCI in slot tn allocated to the original pool can be determined as follows:

1) If the time gap (SFgap) between the current transmission and the next retransmission is 0 (no retransmission), the time and frequency allocation positions for the PSSCH are as follows (17b-50)

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +X-1 in slot tn

2) If the time gap (SFgap) between the current transmission and the next retransmission is not 0 (corresponding to the current transmission), the time and frequency allocation positions for the PSSCH are as follows.

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +X-1 in slot tn (17b-50)

b) sub-channel(s) nsubCHstart(RE), nsubCHstart(RE) +1,??, nsubCHstart(RE) +LsubCH-1 in slot tn+SFgap (17b-60)

3) If the time gap (SFgap) between the current transmission and the next retransmission is not 0 (corresponding to the next retransmission), the time and frequency allocation positions for the PSSCH are as follows.

a) sub-channel(s) nsubCHstart, nsubCHstart +1,??, nsubCHstart +X-1 in slot tn-SFgap

b) sub-channel(s) nsubCHstart(RE), nsubCHstart(RE) +1,??, nsubCHstart(RE) +LsubCH-1 in slot tn

The X represents the length of a subchannel allocated to the PSSCH in initial transmission, and LsubCH represents the length of a subchannel allocated to the PSSCH in retransmission. As described above, a method in which X=1 is fixed may be considered. In addition, nsubCHstart and nsubCHstart(RE) indicate start positions of subchannels allocated to the PSSCH for initial transmission and retransmission, and nsubCHstart and nsubCHstart(RE) information may be included in SCI.

When the frequency resource allocation information is indicated through the above two methods, the start position nsubCHstart of the subchannel allocated to the PSSCH for initial transmission is not separately indicated by SCI, but can be replaced with the value of PSCCH resource m and used ( see Figure 17b). This can be supported when the PSCCH is capable of one-to-one connection in the area where the PSSCH is transmitted. When only the start position nsubCHstart (RE) of a subchannel allocated to PSSCH for retransmission is indicated by SCI, RIV (Resource Indication Value) may be defined as follows.

Here, N _subCH represents the total number of subchannels set in the resource pool by the upper layer.

18 is a flowchart illustrating a method for a transmitting terminal to determine values of bit fields of first control information and second control information according to an embodiment of the present disclosure. Referring to FIG. 18, a transmitting terminal determines a resource to transmit a PSSCH through a method such as channel occupation and channel reservation described above (18-01). The transmitting terminal determines scheduling parameters to be included in the SCI based on the determined resource to transmit the PSSCH. Scheduling parameters may include frequency and time resources of PSSCH, MCS, RV, NDI, H17RQ process ID, and the like. The transmitting terminal determines values of bit fields of the second control information based on the determined scheduling parameter, and determines transmission resources on where to map the second control information (18-03). In addition, the transmitting terminal determines the bit field value of the first control information based on the scheduling parameter of the PSSCH, the bit field value of the second control information, and the transmission resource to which the second control information is mapped (18-05). This is because information for decoding the second control information may be included in the first control information. In addition, the transmitting terminal may determine a transmission resource to which the first control information is mapped based on the scheduling parameter of the PSSCH, the bit field value of the second control information, and the transmission resource to which the second control information is mapped. Based on the determined information, the transmitting terminal transmits first control information, second control information, and PSSCH (18-07).

19 is a flowchart illustrating a method of sequentially decoding first control information and second control information by a receiving terminal according to an embodiment of the present disclosure and decoding a PSSCH based thereon.

Referring to FIG. 19, the receiving terminal attempts to decode first control information based on preset information (19-01). The receiving terminal determines whether or not to decode the second control information according to the bitfield value of the first control information that has been successfully decoded, and if decoding of the second control information is necessary, determines which resource the second control information is mapped to. and decoding is performed (19-03). Here, the reason why it is determined whether to decode the second control information is that decoding of the PSSCH may be possible only with decoding of the first control information in a specific transmission type or transmission mode. Thereafter, the receiving terminal determines PSSCH transmission resources and other scheduling information based on the bitfield values of the decoded first control information (SCI 1) and second control information (SCI 2) (19-05). The receiving terminal performs PSSCH decoding using the identified scheduling information and performs necessary subsequent operations (19-07).

As described above, after the terminal successfully decodes the first control information, it may not necessarily be necessary to decode the second control information. Successfully decoding the control information may mean success in CRC checking.

20 is a diagram illustrating an example in which a frequency domain is divided into subchannel units in a given resource pool and resources are allocated for data transmission in subchannel units according to an embodiment of the present disclosure.

Assume that the number of subchannels in the resource pool is Nsubchannel. One subchannel may be composed of one or more PRBs, and Nsubchannel may be a value set or preset in a resource pool, or may be a value calculated by a specific parameter. Here, data may be transmitted in PSSCH, and resource allocation for data transmission may indicate a resource region used for PSSCH mapping.

If initial transmission is performed in slot n ₁ and retransmission for the initial transmission is performed in slot n ₂ , control information transmitted in slot n ₁ may include resource allocation information for initial transmission and retransmission #1. there is. This may be time domain resource information for slot n ₂ , or frequency domain information for slot n ₁ and slot n ₂ .

If it is assumed that the number of subchannels in the frequency domain used for initial transmission and retransmission is the same, the information of the first subchannel to which mapping of the PSSCH in the corresponding slot starts is determined from the mapping position of the corresponding control information transmitted in the same slot. In this case, the control information transmitted in the initial transmission needs to include the number of subchannels used for PSSCH mapping and information on the first subchannel to which the PSSCH for retransmission is mapped. In this case, in order to deliver frequency domain resource allocation information of PSSCH of initial transmission and retransmission, a bit field having the following size (or smaller or larger size within several bits) may be used for control information.

는 PSSCH가 매핑되는 서브채널의 수와 재전송 PSSCH의 시작 서브채널 위치의 가능한 조합의 경우의 수를 나타내는 것일 수 있다. 베이스를 2로 하는 log를 사용하는 것은 경우의 수의 가능한 경우를 지시하기 위한 비트 수를 계산하기 위한 것일 수 있다.

는

보다 큰 정수 중 제일 작은 정수를 가리킬 수 있으며, 이는 필요한 비트필드의 크기를 정수로 나타내기 위한 것일 수 있다. A bitfield of this size may be for indicating the number of subchannels to which the PSSCH is mapped and the position of the starting subchannel of the retransmission PSSCH.

may indicate the number of possible combinations of the number of subchannels to which the PSSCH is mapped and the starting subchannel position of the retransmitted PSSCH. Using a base 2 log may be to calculate the number of bits to indicate the number of possible cases.

Is

It may point to the smallest integer among larger integers, which may be used to indicate the size of a required bit field as an integer.

As shown in FIG. 20, in order to indicate the frequency resource information to which the PSSCH for initial transmission and three retransmissions is mapped, the size of the bit field for frequency resource allocation must be calculated using at least one of the following methods. You will be able to.

- Method 1: In order to deliver frequency domain resource allocation information of PSSCH of initial transmission and retransmission No. 3, a bit field of the following size (or smaller or larger size within several bits) may be used for control information.

로 나타낼 수 있기 때문에 방법 1과 같이 비트필드의 크기를 결정할 수 있다. As an example, in FIG. 20, the number of cases of the starting subchannel position of the PSSCH transmitted in slot n ₃ and slot n ₄ is

Since it can be expressed as Method 1, the size of the bit field can be determined.

- Method 2: In order to deliver frequency domain resource allocation information of PSSCH of initial transmission and retransmission No. 3, a bit field of the following size (or smaller or larger size within several bits) can be used for control information.

As an example, in FIG. 20, it may be possible for the starting subchannel positions of the PSSCH transmitted in slot n ₃ and slot n ₄ to have N _subchannel positions, respectively. In this case, the size of the bitfield can be determined as in Method 2 . Method 2 may be a method of conveying information on the starting subchannel positions of the PSSCH transmitted in slot n ₃ and slot n ₄ as independent separate bits.

- Method 3: In order to deliver frequency domain resource allocation information of PSSCH of initial transmission and retransmission No. 3, a bit field of the following size (or smaller or larger size within several bits) may be used for control information.

As an example, in FIG. 20, it may be possible for the starting subchannel positions of the PSSCH transmitted in slot n ₃ and slot n ₄ to have N _subchannel positions, respectively. In this case, the size of the bitfield can be determined as in Method 3 . Method 3 may be a method of transmitting the starting subchannel positions of the PSSCH transmitted in slot n ₃ and slot n ₄ together with several bits.

Hereinafter, the present disclosure describes embodiments for performing a method of transmitting and receiving sidelink data. More specifically, a method and apparatus for indicating the location of occupied resources for sidelink transmission are provided.

[First Embodiment]

The present disclosure provides a method and apparatus for occupying resources in a sidelink and indicating the occupied resources to a receiving terminal.

21 is a diagram illustrating an example in which a transmitting terminal transmits a PSCCH and a PSSCH in a sidelink. While transmitting the PSCCH 2102, the transmitting terminal can instruct the receiving terminal in which slot and frequency position the next PSSCHs 2103 and 2107 are transmitted, and this indicator can indicate through TRIV and FRIV values there is. The sidelink control information (SCI) transmitted on the PSCCH may include the following bitfields.

bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise

bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS 38.214].- Frequency resource assignment -

bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise

bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS 38.214].

- Time resource assignment - 5 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise 9 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS 38.214].

In the above, sl-MaxNumPerReserve is a parameter set to 2 or 3 by higher signaling. When sl-MaxNumPerReserve is 2, it indicates resources for transmission of up to two PSSCHs, including the PSSCH in the slot in which the indicated SCI is transmitted. If sl-MaxNumPerReserve is 3, it means that resources for up to 3 PSSCH transmissions including the PSSCH in the slot in which the indicated SCI is transmitted can be indicated.

In the above, the value TRIV of the Time resource assignment bitfield can be calculated as follows.

In the above, t1 means the time offset of the first resource and the second resource, and may be a slot difference on the resource pool. t2 means time offsets of the first resource and the third resource, and may be a slot difference in a resource pool. That is, t1 < t2, and since resources that can be indicated in TRIV can only indicate resources within 32 slots, since t0 = 0, t1 < t2 < 31. In the above, the TRIV value becomes a Time resource assignment bitfield value in SCI. In the above, N is the number of actually indicated resources. The maximum number of resources that can be indicated is set by sl-MaxNumPerReserve , but the number of actually indicated or reserved resources may be smaller than sl-MaxNumPerReserve , so N < sl-MaxNumPerReserve . The transmitting terminal may determine N according to the number of resources to be actually indicated, determine a TRIV value accordingly, configure and transmit an SCI bitfield based on the TRIV value. Upon receiving the SCI, the receiving terminal can know the TRIV value and can find the N value from the TRIV value.

FRIV, which is a value of a frequency resource assignment bitfield for frequency resource allocation in SCI, is determined as follows.

상기에서

,

,

는 각각 첫번째, 두번째, 세번째 자원의 주파수 영역에서 시작하는 서브채널의 인덱스를 의미한다.

는 PSSCH가 할당되는 서브채널의 갯수이다. 첫번째, 두번째, 세번째 전송에서 모두 동일하다.

는 해당 리소스풀 또는 해당 사이드링크 캐리어에서 설정된 전체 서브채널의 개수다. 수신 단말은 상기에서 수신한 SCI의 TRIV 값에서부터 실제 지시하는 (또는 예약하는) 자원의 수인 N을 알 수 있다. 만약, N < sl-MaxNumPerReserve 이면,

또는

과

은 사용되지 않으므로, 송신 단말은 상기 FRIV의 값을 하기와 같은 방법중 하나 또는 하나 이상의 결합으로 결정할 필요가 있다. 또한 수신 단말은 상기 FRIV의 값으로부터 전송 자원 및 예약된 자원의 주파수 위치를 하기와 같은 방법 중 하나 또는 하나 이상의 결합으로 결정할 필요가 있다. 왜냐하면 파라미터(일례로

,

,

,

중 적어도 하나)의 값을 정하지 않고서는 송신단말은 FRIV 값을 결정할 수 없기 때문이다. 수신단말은 미리 설정을 통해 sl-MaxNumPerReserve값을 알고 있으며, SCI를 수신하고, TRIV 값을 알아내면 실제 지시하는 자원의 수인 N을 알아낼 수 있다. 수신단말은 N을 획득한 후 하기와 같은 방법 중 하나 또는 하나 이상의 결합을 기반으로 수신 자원 및 예약 자원의 주파수 위치를 결정한다.

from above

,

,

denotes the index of a subchannel starting in the frequency domain of the first, second, and third resources, respectively.

is the number of subchannels to which the PSSCH is allocated. The first, second and third transmissions are all the same.

is the total number of subchannels configured in the corresponding resource pool or the corresponding sidelink carrier. The receiving terminal can know N, which is the number of actually indicated (or reserved) resources, from the TRIV value of the SCI received above. If N < sl-MaxNumPerReserve ,

or

class

Since is not used, the transmitting terminal needs to determine the value of the FRIV by one or a combination of one or more of the following methods. In addition, the receiving terminal needs to determine the frequency location of the transmission resource and the reserved resource from the value of the FRIV by one or a combination of one or more of the following methods. because the parameters (e.g.

,

,

,

This is because the transmitting terminal cannot determine the FRIV value without determining the value of at least one of The receiving terminal knows the value of sl-MaxNumPerReserve through presetting, receives the SCI, and finds out the TRIV value, so that it can find out N, the number of actually indicated resources. After acquiring N, the receiving terminal determines the frequency positions of the reception resource and the reserved resource based on one or a combination of one or more of the following methods.

의 값을 0으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T1: When sl-MaxNumPerReserve is 2 and N=1, the transmitting terminal

The FRIV value is calculated by setting or assuming that the value of is 0, and based on this, the SCI bitfield is configured.

과

의 값을 0으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T2: When sl-MaxNumPerReserve is 3 and N=1, the transmitting terminal

class

The FRIV value is calculated by setting or assuming that the value of is 0, and based on this, the SCI bitfield is configured.

의 값을 0으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T3: When sl-MaxNumPerReserve is 3 and N=2, the transmitting terminal

The FRIV value is calculated by setting or assuming that the value of is 0, and based on this, the SCI bitfield is configured.

의 값을 0부터

사이의 값중에서 임의의 값으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T4: When sl-MaxNumPerReserve is 2 and N=1, the transmitting terminal

value from 0

The FRIV value is calculated by setting or assuming an arbitrary value among the values in between, and based on this, the SCI bitfield is configured.

과

의 값을 0부터

사이의 값중에서 임의의 값으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T5: When sl-MaxNumPerReserve is 3 and N=1, the transmitting terminal

class

value from 0

The FRIV value is calculated by setting or assuming an arbitrary value among the values in between, and based on this, the SCI bitfield is configured.

의 값을 0부터

사이의 값중에서 임의의 값으로 정하거나 가정하여 FRIV값을 계산하고 이를 기반하여 SCI 비트필드를 구성한다. -Method T6: When sl-MaxNumPerReserve is 3 and N=2, the transmitting terminal

value from 0

The FRIV value is calculated by setting or assuming an arbitrary value among the values in between, and based on this, the SCI bitfield is configured.

의 값을 0으로 가정하고, FRIV 값으로부터

값을 알아낸다. -Method R1: When sl-MaxNumPerReserve is 2 and N=1, the receiving terminal

Assuming the value of 0, from the FRIV value

find out the value

과

의 값을 0으로 가정하고, FRIV 값으로부터

값을 알아낸다.-Method R2: When sl-MaxNumPerReserve is 3 and N=1, the receiving terminal

class

Assuming the value of 0, from the FRIV value

find out the value

의 값을 0으로 가정하고, FRIV 값으로부터

와

값을 알아낸다.-Method R3: When sl-MaxNumPerReserve is 3 and N=2, the receiving terminal

Assuming the value of 0, from the FRIV value

and

find out the value

값을 알아낸다. -Method R4: When sl-MaxNumPerReserve is 2 and N=1, the receiving terminal obtains from the FRIV value

find out the value

값을 알아낸다.-Method R5: When sl-MaxNumPerReserve is 3 and N=1, the receiving terminal obtains from the FRIV value

find out the value

와

값을 알아낸다.-Method R6: When sl-MaxNumPerReserve is 3 and N=2, the receiving terminal obtains from the FRIV value

and

find out the value

In the present disclosure, a method and implementation of configuring and interpreting SCI by a transmitting terminal and a receiving terminal have been described, but the method and apparatus proposed in the present disclosure can apply the same method or embodiment even in a system without HARQ-ACK feedback. there is.

In addition, in the present disclosure, a method and an embodiment of receiving control and data information in consideration of initial transmission and retransmission for convenience have been described, but even when repetition or repeated transmission is applied to the initial transmission instead of retransmission, The same method or embodiment thereof can be applied. Here, repeated transmission means additional transmission corresponding to the TB used for the initial transmission after the initial transmission.

A transmitting unit, a receiving unit, and a processing unit of a terminal and a base station capable of performing the above embodiments of the present disclosure are illustrated in FIGS. 22 (and 24) and 23 (and 25), respectively. In order to perform the operation for determining signal transmission and reception described in the first to fourth embodiments, a transmission and reception method between a base station and a terminal or between a transmitting end and a receiving end is shown. may operate according to each embodiment.

22 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 22 , a terminal of the present disclosure may include a terminal receiving unit 22-00, a terminal transmitting unit 22-04, and a terminal processing unit 22-02. The terminal receiver 22-00 and the terminal transmitter 22-04 may be collectively referred to as a transceiver in an embodiment of the present disclosure. The transmitting/receiving unit may transmit/receive signals with the base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency. In addition, the transmitting/receiving unit may receive a signal through a wireless channel, output the signal to the terminal processing unit 22-02, and transmit the signal output from the terminal processing unit 22-02 through the wireless channel. The terminal processing unit 22-02 may control a series of processes so that the terminal may operate according to the above-described embodiment of the present disclosure. For example, the terminal receiving unit 22-00 receives downlink control information from the base station, and the terminal processing unit 22-02 determines an HARQ ID according to the control information and prepares for transmission and reception accordingly. . Thereafter, the terminal transmission unit 22-04 may transmit scheduled data to the base station.

23 is a block diagram illustrating the internal structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 23 , the base station of the present disclosure may include a base station receiving unit 23-01, a base station transmitting unit 23-05, and a base station processing unit 23-03. The base station receiving unit 23-01 and the base station transmitting unit 23-05 may collectively be referred to as transceivers in an embodiment of the present disclosure. The transmission/reception unit may transmit/receive signals with the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency. In addition, the transmission/reception unit may receive a signal through a radio channel, output the signal to the base station processing unit 23-03, and transmit the signal output from the base station processing unit 23-03 through a radio channel. The base station processing unit 23-03 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, the base station processing unit 23-03 may transmit a downlink control signal to the terminal if necessary according to the configuration information set by the base station processing unit 23-03. Thereafter, the base station transmitter 23-05 transmits related scheduling control information and data, and the base station receiver 23-01 receives feedback information from the terminal.

24 is a block diagram of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 24, a terminal may include a transceiver 24-05, a memory 24-10, and a processor 24-15. According to the communication method of the terminal described above, the transceiver 24-05, the processor 24-15, and the memory 24-10 of the terminal may operate. However, the components of the terminal are not limited to the above-described examples. For example, a terminal may include more or fewer components than the aforementioned components. In addition, the transceiver 24-05, the processor 24-15, and the memory 24-10 may be implemented as a single chip. Additionally, processors 24-15 may include one or more processors.

The transmission/reception unit 24-05 collectively refers to a reception unit of a terminal and a transmission unit of a terminal, and may transmit/receive signals to/from a network entity, a base station, or other terminals. Signals transmitted to and from a network entity, base station, or other terminal may include control information and data. To this end, the transceiver 24-05 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts its frequency. However, this is only one embodiment of the transceiver 24-05, and components of the transceiver 24-05 are not limited to the RF transmitter and the RF receiver.

In addition, the transceiver 24-05 may receive a signal through a radio channel, output the signal to the processor 24-15, and transmit the signal output from the processor 24-15 through the radio channel.

The memory 24-10 may store programs and data required for operation of the terminal. Also, the memory 24-10 may store control information or data included in a signal obtained from the terminal. The memory 24-10 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the memory 24-10 may not exist separately but may be included in the processor 24-15.

The processor 24-15 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure. For example, the processor 24-15 may receive a control signal and a data signal through the transceiver 24-05 and process the received control signal and data signal. In addition, the processor 24-15 may The processed control signal and data signal can be transmitted through the transceiver 24-05. In addition, the processor 24-15 may control components of the terminal to simultaneously receive a plurality of PDSCHs by receiving DCI composed of two layers. There may be a plurality of processors 24-15, and the processor 24-15 may perform a component control operation of the terminal by executing a program stored in the memory 24-10.

25 is a block diagram of a base station according to an embodiment of the present disclosure.

Referring to FIG. 25, base 7 may include a transceiver 25-05, a memory 25-10, and a processor 25-15. According to the communication method of the base station described above, the transceiver 25-05, the processor 25-15, and the memory 25-10 of the base station can operate. However, components of the base station are not limited to the above-described examples. For example, a base station may include more or fewer components than those described above. In addition, the transceiver 25-05, the processor 25-15, and the memory 25-10 may be implemented as a single chip. Additionally, processor 25-15 may include one or more processors.

The transmission/reception unit 25-05 collectively refers to a reception unit of a base station and a transmission unit of a base station, and may transmit/receive a signal to/from a terminal or a network entity. A signal transmitted and received with a terminal or network entity may include control information and data. To this end, the transceiver 25 - 05 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts its frequency. However, this is only one embodiment of the transceiver 25-05, and components of the transceiver 25-05 are not limited to the RF transmitter and the RF receiver.

In addition, the transceiver 25-05 may receive a signal through a radio channel, output the signal to the processor 25-15, and transmit the signal output from the processor 25-15 through a radio channel.

The memory 25-10 may store programs and data necessary for the operation of the base station. Also, the memory 25-10 may store control information or data included in a signal obtained from the base station. The memory 25 - 10 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the memory 25-10 may not exist separately but may be included in the processor 25-15.

The processor 25-15 may control a series of processes so that the base station operates according to the above-described embodiment of the present disclosure. For example, the processor 25-15 may receive a control signal and a data signal through the transceiver 25-05 and process the received control signal and data signal. In addition, the processor 25-15 may The processed control signal and data signal can be transmitted through the transceiver 25-05. In addition, the processor 25-15 may control each component of the base station to configure and transmit DCI including allocation information for the PDSCH. There may be a plurality of processors 25-15, and the processor 25-15 may perform a component control operation of the base station by executing a program stored in the memory 25-10.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure are possible. In addition, each of the above embodiments can be operated in combination with each other as needed. In addition, the above embodiments will be able to implement other modifications based on the technical idea of the above embodiments, such as an LTE system and a 5G system.

Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium may be configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

Such programs (software modules, software) may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

In addition, the program is provided through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a communication network consisting of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in singular or plural numbers according to the specific embodiments presented. However, the singular or plural expressions are selected appropriately for the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural are composed of the singular number or singular. Even the expressed components may be composed of a plurality.

Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments and should not be defined by the scope of the claims described below as well as those equivalent to the scope of these claims.

Claims (1)

A 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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