KR20200107725A - Apparatus and method for transmitting feedback information in wireless communication system - Google Patents

Abstract

The present invention relates to a 5^th generation (5G) or pre-5G communication system to support a higher data transmission rate than that of a 4^th generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the present invention, an operation method of a terminal in a wireless communication system comprises the processes of: receiving sidelink feedback control information (SFCI) from another terminal; identifying a resource region for transmitting the SFCI to a base station; and transmitting control information including the SFCI and uplink control information (UCI) to the base station in the resource region.

Description

Device and method for transmitting feedback information in a wireless communication system {APPARATUS AND METHOD FOR TRANSMITTING FEEDBACK INFORMATION IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for transmitting feedback information in a wireless communication system.

4G (4 ^th generation) to meet the traffic demand in the radio data communication system increases since the commercialization trend, efforts to develop improved 5G (5 ^th generation) communication system, or pre-5G communication system have been made. For this reason, the 5G communication system or the pre-5G communication system is called a Beyond 4G Network communication system or a Long Term Evolution (LTE) system (Post LTE) system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (for example, the 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed.

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

Sidelink refers to a communication method in which a terminal communicates directly with another terminal without going through a base station. The terminal may transmit data and control information to another terminal through a sidelink, and may receive data and control information from the other terminal. In addition, the terminal performing sidelink communication may be located within the coverage of the base station, and in this case, the terminal may also perform communication with the base station.

In a wireless communication system (e.g., a new radio (NR) system), a receiving device receives data according to data transmission from a transmitting device to a receiving device, and then HARQ-ACK (hybrid automatic repeat request-acknowledgment) feedback information for the data Can be transmitted to the transmitting device. For example, in downlink data transmission, the terminal transmits HARQ-ACK feedback information for data transmitted from the base station in the configured resource to the base station. Even in sidelink data transmission, the receiving terminal may transmit HARQ-ACK feedback to the transmitting terminal. At this time, when the sidelink transmission is performed according to the scheduling of the base station, the terminal transmitting the data may transmit information such as whether the sidelink data transmission is successful or the amount of data that the terminal needs to transmit to the baselink. . For example, information such as whether sidelink data transmission is successful or an amount of data to be transmitted by the terminal through the sidelink may be information necessary for the base station to schedule sidelink transmission. When the terminal performing the sidelink data transmission transmits the sidelink feedback to the base station, not only the sidelink feedback information but also other control information needs to be transmitted in the uplink. For example, control information such as HARQ-ACK for downlink data and channel state information (CSI) feedback for channel information transmission may be transmitted in uplink together with sidelink feedback information.

Based on the above discussion, the present disclosure provides an apparatus and method for transmitting feedback information in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for a terminal to transmit a feedback on sidelink data transmission to a base station in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting HARQ-ACK information for sidelink data in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting uplink control information related to feedback on sidelink data in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for a receiving terminal to transmit HARQ-ACK feedback to a transmitting terminal in data communication for sidelink group cast in a wireless communication system.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system includes a process of receiving sidelink feedback control information (SFCI) from another terminal, and a process of identifying a resource region for transmitting the SFCI to a base station. And, transmitting control information including the SFCI and uplink control information (UCI) to the base station in the resource region.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system includes a process of receiving sidelink control information (SCI) including location information of at least one terminal from another terminal, and from the other terminal. A process of acquiring measurement information related to the strength of a received signal, and a process of determining whether to transmit feedback information on sidelink groupcast data received from the other terminal based on the location information and the measurement information. Include.

According to various embodiments of the present disclosure, an apparatus of a terminal in a wireless communication system includes a transceiver for receiving sidelink feedback control information (SFCI) from another terminal, and at least one identifying a resource region for transmitting the SFCI to a base station. Including the processor of. The transceiver transmits control information including the SFCI and uplink control information (UCI) to the base station in the resource region.

According to various embodiments of the present disclosure, a device of a terminal in a wireless communication system includes a transceiver for receiving sidelink control information (SCI) including location information for at least one terminal from another terminal, and receiving from the other terminal At least one processor for acquiring measurement information related to the strength of the obtained signal, and determining whether to transmit feedback information on sidelink groupcast data received from the other terminal based on the location information and the measurement information. Include.

An apparatus and method according to various embodiments of the present disclosure is a resource used to transmit and/or receive feedback information by transmitting uplink control information (UCI) and sidelink feedback control information (SFCI) to a base station in the same resource area. To decrease.

The apparatus and method according to various embodiments of the present disclosure define a processing time for transmitting the SFCI to the base station after receiving the SFCI in the sidelink, thereby providing sufficient processing for the terminal to process the SFCI before transmitting the SFCI to the base station. It allows you to free up time.

An apparatus and method according to various embodiments of the present disclosure may prevent unnecessary resource allocation by selectively transmitting feedback information on sidelink groupcast data to other terminals according to whether the sidelink groupcast data is valid information for the terminal. Make it possible.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates a structure of a time-frequency domain in which data or control information is transmitted in downlink or uplink in a wireless communication system according to various embodiments of the present disclosure.
6 shows an example in which data for eMBB, URLLC, and mMTC are allocated to time-frequency resources in a wireless communication system according to various embodiments of the present disclosure.
7 shows another example in which data for eMBB, URLLC, and mMTC are allocated to time-frequency resources in a wireless communication system according to various embodiments of the present disclosure.
8 illustrates an example of performing unicast communication between terminals through a side link in a wireless communication system according to various embodiments of the present disclosure.
9 shows an example of a case in which group cast communication is performed through a sidelink in a wireless communication system according to various embodiments of the present disclosure.
10 illustrates an example of transmitting feedback information indicating success or failure of reception of groupcast data in a wireless communication system according to various embodiments of the present disclosure.
11 illustrates a structure of a resource to which a synchronization signal (SS) and a physical broadcast channel are mapped in a wireless communication system according to various embodiments of the present disclosure.
12 illustrates symbols to which an SS/PBCH block is mapped in a slot in a wireless communication system according to various embodiments of the present disclosure.
13 illustrates an example of symbols in which an SS/PBCH block may be transmitted according to a subcarrier interval in a wireless communication system according to various embodiments of the present disclosure.
14 illustrates another example of symbols in which an SS/PBCH block may be transmitted according to a subcarrier interval in a wireless communication system according to various embodiments of the present disclosure.
15 illustrates an example of a case where a base station schedules sidelink data transmission in a wireless communication system according to various embodiments of the present disclosure.
16 illustrates an example of transmitting feedback information on a sidelink in a wireless communication system according to various embodiments of the present disclosure.
17 illustrates an example of transmitting feedback information on sidelink data in a wireless communication system according to various embodiments of the present disclosure.
18 illustrates an example of division of code blocks and addition of CRC to code blocks in a wireless communication system according to various embodiments of the present disclosure.
19 shows an example of a configuration of feedback bits to be transmitted to a base station in an uplink in a wireless communication system according to various embodiments of the present disclosure.
20 illustrates an example of a sidelink groupcast in a wireless communication system according to various embodiments of the present disclosure.
21 is a flowchart of a terminal for sidelink communication in a wireless communication system according to various embodiments of the present disclosure.
22 is a flowchart of a terminal for sidelink groupcast in a wireless communication system according to various embodiments of the present disclosure.

Terms used in the present disclosure are used only to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the technical field described in the present disclosure. Among the terms used in the present disclosure, terms defined in a general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related technology, and unless explicitly defined in the present disclosure, an ideal or excessively formal meaning Is not interpreted as. In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware approach is described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude a software-based approach.

Hereinafter, the present disclosure relates to an apparatus and method for transmitting feedback information in a wireless communication system. Specifically, the present disclosure describes a technique for transmitting hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback information for sidelink data transmission and information related to HARQ-ACK feedback information in a wireless communication system.

In the following description, 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, etc. are for convenience of description. It is illustrated. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

In addition, the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), but this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

It is assumed that the wireless communication system of the present disclosure may include a new radio (NR) system, and various embodiments of the present disclosure may be applied to the NR system. However, this is only an example for description, and various embodiments of the present disclosure may be easily modified and applied to other communication systems.

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

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

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

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

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

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

1 illustrates a wireless communication system according to various embodiments of the present disclosure. 1 illustrates a base station 110, a terminal 120, and a terminal 130 as some of nodes using a radio channel in a wireless communication system. 1 shows only one base station, but another base station that is the same as or similar to the base station 110 may be further included.

The base station 110 is a network infrastructure that provides wireless access to the terminals 120 and 130. The base station 110 has a coverage defined as a certain geographic area based on a distance at which signals can be transmitted. In addition to the base station, the base station 110 is'access point (AP)','eNodeB (eNodeB, eNB)','gNodeB (gNB)', '5G node (5th generation node)' ,'Wireless point','transmission/reception point (TRP)', or another term having an equivalent technical meaning.

Each of the terminal 120 and terminal 130 is a device used by a user and performs communication with the base station 110 through a radio channel. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without user involvement. 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'user equipment (UE)','mobile station','subscriber station','remote terminal', and'other than terminal'. It may be referred to as'wireless terminal','user device', or another term having an equivalent technical meaning.

The base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in a millimeter wave (mmWave) band (eg, 28 GHz, 30 GHz, 38 GHz, 60 GHz). In this case, 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 transmission beamforming and reception 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, subsequent 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.

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as the configuration of the base station 110. Terms such as'~ unit' and'~ group' used hereinafter refer to a unit that processes at least one function or operation, which may be implemented as hardware or 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 function of converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, 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 stream 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 and transmits it 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 transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. In addition, the wireless communication unit 210 may include a plurality of transmission/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 and operating frequency. Can be. 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 are used in a sense including the processing as described above is performed by the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit stream 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 a physical signal received from another node into a bit stream. Convert to

The storage unit 230 stores data such as a basic program, an application program, and setting information for the operation of the base station. The storage unit 230 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. Then, 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 controller 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. In addition, 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 a communication standard. 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 various embodiments, the controller 240 may control the base station to perform operations according to various embodiments described below.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 may be understood as the configuration of the terminal 120. Terms such as'~ unit' and'~ group' used hereinafter refer to a unit that processes at least one function or operation, which may be implemented as hardware or 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 function of converting between a baseband signal and a bit stream 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 through demodulation and decoding of the baseband signal. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal and transmits it 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 transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, 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 be composed of 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. In addition, the communication unit 310 may include a plurality of 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'transmitting/receiving unit'. In addition, in the following description, transmission and reception performed through a wireless channel are used in a sense including the processing as described above by the communication unit 310.

The storage unit 320 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 320 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. Further, the storage unit 320 provides 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. In addition, the controller 330 may perform functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or a micro processor, or may be a part of a processor. In addition, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP).

According to various embodiments, the controller 330 may control the terminal to perform operations according to various embodiments to be described later.

4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. 4 shows an example of 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 part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3, and illustrates components for performing beamforming.

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

The encoding and modulating 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 modulating unit 402 generates modulation symbols by performing constellation mapping.

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

The plurality of transmission paths 406-1 to 406-N convert digital beamformed digital signals into 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) scheme, and may be excluded when another physical layer scheme (eg, filter bank multi-carrier (FBMC)) is applied. That is, a plurality of transmission paths 406-1 to 406-N provide an independent signal processing process 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 beamforming unit 408 performs beamforming on an analog signal. To this end, the digital beamforming unit 404 multiplies analog signals by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of the signal. Specifically, according to a plurality of transmission paths 406-1 to 406-N and a connection structure between antennas, the analog beamforming unit 440 may be configured in various ways. For example, each of the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, a plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. As another example, the plurality of transmission paths 406-1 to 406-N may be adaptively connected to one antenna array or to two or more antenna arrays.

The wireless communication system not only provides an initial voice-oriented service, but also includes, for example, 3GPP high speed packet access (HSPA), long term evolution (LTE), evolved universal terrestrial radio access (E-UTRA), and LTE- A broadband wireless communication system that provides high-speed, high-quality packet data services such as LTE-advanced (A), high rate packet data (HRPD), ultra mobile broadband (UMB), and/or IEEE 802.16e communication standards of 3GPP2. Is developing. Further, the communications standard is made of three 5 (5 ^th generation, 5G) as a wireless communication system 5G or NR (new radio).

An NR system, which is a representative example of a broadband wireless communication system, employs an orthogonal frequency division multiplexing (OFDM) scheme in downlink (DL) and uplink. In more detail, in the NR system, a cyclic-prefix OFDM (CP-OFDM) scheme was employed for downlink, and a CP-OFDM and discrete Fourier transform spreading OFDM (DFT-S-OFDM) scheme were employed for uplink. In various embodiments of the present disclosure, the uplink refers to a radio link through which the UE transmits data or control signals to the base station, and the downlink refers to a radio link through which the base station transmits data or control signals to the UE. In the multiple access schemes such as OFDM, CP-OFDM and/or DFT-S-OFDM described above, time-frequency resources for carrying data or control information for each user do not overlap with those for other users. Radio resources are allocated and/or operated so as not to overlap, that is, orthogonality is established, and thus data or control information of each user is distinguished.

In addition, the NR system is designed so that various services can be freely multiplexed in time and frequency resources. Accordingly, in the NR system, waveforms, numerology, and/or reference signals are used according to the needs of the service. It can be allocated dynamically or freely. In wireless communication, in order to provide an optimal service to a terminal, optimized data transmission based on measurement of channel quality and interference amount is important, and accurate channel measurement is essential for optimized data transmission. However, unlike 4G channels, in which the channel and interference characteristics do not change significantly depending on frequency resources, in the case of 5G channels, the channel and interference characteristics change significantly depending on the service. It is necessary to support a subset of the (frequency resource group) unit.

Meanwhile, the types of services supported in the NR system may be divided into categories such as enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). For example, eMBB may be a high-speed transmission of high-capacity data, mMTC may be a service aiming at minimizing terminal power and connecting multiple terminals, and URLLC for high reliability and low latency. Different requirements may be applied according to the type of service applied to the terminal. As described above, a plurality of services can be provided to users in a communication system, and in order to provide a plurality of services to users, an apparatus and method for providing each service within the same time period according to the characteristics of each service is required. do.

The NR system employs a hybrid automatic repeat request (HARQ) scheme in which the physical layer retransmits the data when a decoding failure for data occurs in initial transmission. In the HARQ scheme, when the receiving device fails to accurately decode (decode) data, the receiving device transmits negative acknowledgment (NACK) notifying the transmitting device of the decoding failure so that the transmitting device can retransmit the corresponding data in the physical layer. do. The receiving device may improve data reception performance by combining data retransmitted by the transmitting device with data that has previously failed to be decoded. In addition, when the receiving device correctly decodes data, the HARQ scheme allows the receiving device to transmit new data by transmitting acknowledgment (ACK) notifying the transmitting device of the decoding success.

5 illustrates a structure of a time-frequency domain in which data or control information is transmitted in downlink or uplink in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 5, 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 may constitute one slot 506. The length of the subframe may be defined as 1.0 ms, and the length of the radio frame 514 may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N _BW subcarriers 504.

The basic unit of a resource in the time-frequency domain may be a resource element (RE) 512, and RE 502 may be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or physical resource block, PRB) 508 may be defined as one OFDM symbol in the time domain and N _RB subcarriers in the frequency domain. Therefore, one RB 508 may be composed of N _RB RE 512s. In various embodiments, the minimum transmission unit of data may be an RB. In the NR system, N _symb = 14 and N _RB = 12, and N _BW and N _RB are proportional to the bandwidth of the system transmission band. The data rate may increase in proportion to the number of RBs scheduled to the terminal.

In the case of frequency division duplex (FDD) in which downlink and uplink are divided into frequencies in the NR system, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Tables 1 and 2 show the correspondence between the system transmission bandwidth, subcarrier spacing (SCS) and channel bandwidth defined in the NR system in a frequency band lower than 6 GHz and a frequency band higher than 6 GHz, respectively. Show.

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

Channel bandwidth BW _Channel [MHz] 50 100 20 50 Subcarrier spacing 60 kHz 132 264 N/A 270 120 kHz 66 132 264 133

For example, when the subcarrier interval is 30 kHz and the channel bandwidth is 100 MHz, the transmission bandwidth may consist of 273 RBs. In <Table 1> and <Table 2>, N/A may correspond to a bandwidth-subcarrier combination that is not supported by the NR system. Scheduling information for downlink data or uplink data in the NR system is downlink control information ( It may be transmitted from the base station to the terminal through downlink control information, DCI). DCI is defined according to various formats, each format is DCI scheduling information for uplink data (UL grant), scheduling information for downlink data (DL grant), compact DCI with a small size of control information, multiple antennas It may be indicated that it is DCI for applying spatial multiplexing or DCI for power control. For example, DCI format 1-1, which is scheduling control information (DL grant) for downlink data, may include at least the following control information:

-Carrier indicator: indicates a frequency carrier for transmission

-DCI format indicator: indicates whether it is DCI for downlink or DCI for uplink

-Bandwidth part (BWP) indicator: indicates the BWP for transmission

-Frequency domain resource allocation: indicates RBs in the frequency domain allocated for data transmission. The resource represented by the frequency domain resource allocation is determined according to the system bandwidth and resource allocation scheme.

-Time domain resource allocation: indicates a slot through which a data-related channel is transmitted and an OFDM symbol

-VRB-to-PRB mapping: Indicate a method of mapping a virtual RB (virtual RB, VRB) index and a physical RB (physical RB, PRB) index

-Modulation and coding scheme (MCS): Indicates the modulation method used for data transmission and the size of the transport block, which is the data to be transmitted.

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

-New data indicator (NDI): indicates initial HARQ transmission or retransmission

-Redundancy version (RV): indicates redundancy version of HARQ

-Transmission power control command for PUCCH (transmit power control, TPC, command for physical uplink control channel, PUCCH): Instructs a transmission power control command for the uplink control channel PUCCH

인 경우,

일 수 있고, 그 외의 경우

일 수 있다. 여기에서,

이 만족될 수 있다.For example, in the case of data transmission through PUSCH, time domain resource assignment includes information on a slot in which a PUSCH is transmitted, and a start symbol position S in a corresponding slot and the number of symbols L to which the PUSCH is mapped. I can instruct you. Here, S may be a relative position from the beginning of the slot, L may be the number of consecutive symbols, and S and L may be determined from a start and length indicator value (SLIV). For example,

If is,

Can be, otherwise

Can be From here,

Can be satisfied.

In the NR system, the UE may receive information on a slot in the form of a table indicating a SLIV value, a PUSCH mapping type, and a PUSCH in one row through radio resource control (RRC) configuration. Thereafter, the base station transmits the DCI including the time domain resource allocation indicating the index value in the set table to the terminal, thereby transmitting the SLIV value, the PUSCH mapping type, and information about the slot in which the PUSCH is transmitted to the terminal.

In the NR system, the PUSCH mapping type may include type A and type B. According to the PUSCH mapping type A, the first symbol among demodulation reference signal (DMRS) symbols is located in the second or third OFDM symbol of a slot. According to PUSCH mapping type B, the first symbol among DMRS symbols is located in the first OFDM symbol in the time domain resource allocated for PUSCH transmission.

DCI may be transmitted on a downlink physical downlink control channel (PDCCH) through channel coding and modulation. According to various embodiments of the present disclosure, transmission of control information through PDCCH or PUCCH may be expressed as transmission of PDCCH or PUCCH. Similarly, transmission of data through PUSCH or PDSCH may be expressed as transmission of PUSCH or PDSCH.

For each terminal, a CRC (cyclic redundancy check) scrambled with a specific radio network temporary identifier (RNTI) (or terminal identifier) is added to the DCI, and after channel coding is applied to the DCI, the DCI is each independent PDCCH. Constructed and transmitted. The PDCCH may be mapped and transmitted in a control resource set (CORESET) set to the terminal.

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

Among the control information including DCI, through the MCS, the base station may notify the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size, TBS). In various embodiments, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to the size of the TB before the channel coding for error correction is applied to the data (transport block, TB) intended to be transmitted by the base station.

In various embodiments, a transport block (TB) is at least one of a medium access control (MAC) header, a control element (CE), one or more MAC service data units (SDUs), and padding bits. It may include. Alternatively, the TB may indicate a unit of data delivered from the MAC layer to a physical layer or a MAC protocol data unit (PDU).

Modulation schemes supported in the NR system may include quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, and 256QAM, and each modulation order (Qm) is 2, 4, 6 , Corresponds to 8. That is, 2 bits per symbol in QPSK modulation, 4 bits per symbol in 16QAM modulation, 6 bits per symbol in 64QAM modulation, and 8 bits per symbol in 256QAM modulation may be transmitted.

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

In various embodiments of the present disclosure, higher signaling refers to signal transfer from a base station to a terminal through a downlink data channel of a physical layer or from a terminal to a base station through an uplink data channel of a physical layer, for example, It may include RRC signaling or MAC control element signaling.

6 shows an example in which data for eMBB, URLLC, and mMTC are allocated to time-frequency resources in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 6, FIG. 6 shows a pattern in which data for eMBB, URLLC, and mMTC are allocated in a total system bandwidth of 600. While the eMBB data 601 and the mMTC data 609 are allocated and transmitted in a specific frequency band, URLLC data 603, 605, and 607 may be generated so that transmission of the URLLC data 603, 605, and 607 may be requested. In this case, URLLC data 603, 605, and 607 may be transmitted in the corresponding part by emptying or not transmitting the part in which the eMBB data 601 and the mMTC data 609 are already allocated. Since it is necessary to reduce the delay time for the URLLC service, URLLC data 603, 605, and 607 may be allocated and transmitted to a part of the resource to which the eMBB data 601 is allocated. When URLLC data 603, 605, and 607 are additionally allocated and transmitted from the resource to which the eMBB data 601 is allocated, the eMBB data 601 may not be transmitted in the overlapping frequency-time resource, and thus the transmission performance of the eMBB data 601 is reduced. can do. In other words, transmission of the eMBB data 601 may fail due to the allocation of the URLLC data 603, 605, and 607.

7 shows another example in which data for eMBB, URLLC, and mMTC are allocated to time-frequency resources in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 7, the total system bandwidth 700 may be divided into subbands 702, 704, and 706, and each subband may be used to transmit service and data. Information related to subband configuration (or information related to subband) may be determined in advance or may be transmitted from the base station to the terminal through higher level signaling. Alternatively, the base station or the network node may provide services to the terminal without transmitting separate subband configuration information to the terminal. In FIG. 7, subband 302 may be used for transmission of eMBB data 708, subband 704 may be used for transmission of URLLC data 710, 712, and 714, and subband 706 may be used for transmission of mMTC data 716.

In various embodiments, a length of a transmission time interval (TTI) used for transmission of URLLC data 710, 712, and 714 may be shorter than a length of a TTI used for transmission of eMBB data 708 or mMTC data 716. In addition, a response of information related to URLLC may be transmitted promptly than a response of information related to eMBB or information related to mMTC, and accordingly, information related to URLLC may be transmitted with a low delay. The structure of a physical layer channel used for each service or data to transmit the above three services or data (eg, eMBB, URLLC, and mMTC) may be different. For example, at least one of a length of a transmission time interval (TTI), an allocation unit of a frequency resource, a structure of a control channel, or a mapping method of data may be different.

In FIGS. 6 and 7, three services and/or data (eg, eMBB, URLLC, and mMTC) have been described, but this is exemplary, and there may be more types of services and data corresponding to each service. Also, in this case, various embodiments of the present disclosure may be applied.

Hereinafter, a method and apparatus for performing data communication between a base station and a terminal or terminals are provided. In various embodiments of the present disclosure, the type of data transmission may include a case where data is transmitted from one terminal to a plurality of terminals, or a case where data is transmitted from one terminal to one terminal. Alternatively, the type of data transmission may include a case where data is transmitted from a base station to a plurality of terminals. However, various embodiments of the present disclosure are not limited to the above-described types, and various modifications are possible.

8 illustrates an example of performing unicast communication between terminals through a side link in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 8, terminal 801 (eg, terminal 120) may transmit a signal to terminal 805 (eg, terminal 130). Although not shown, the terminal 805 may transmit a signal to the terminal 801. Other terminals 807 and 809 other than the terminal 801 and the terminal 805 cannot receive signals exchanged between the terminal 801 and the terminal 805 through unicast. The exchange of signals through unicast between the terminal 801 and the terminal 805 is performed by mapping the exchanged data to the resources promised between the terminal 801 and the terminal 805, or scrambling using mutually promised values, mapping control information, and setting each other. It may be performed based on at least one of data transmission using a value and a method of checking each other's unique ID values. In various embodiments, the plurality of terminals 801, 805, 807, and 809 may include a vehicle terminal. In various embodiments, separate control information, a physical control channel, and/or data may be transmitted for unicast transmission.

9 shows an example of a case in which group cast communication is performed through a sidelink in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 9, a terminal 901 (eg, terminal 120) may transmit common data to a plurality of terminals 903, 905, 907, and 909 through a sidelink. Signals transmitted for groupcast may be received by a plurality of terminals 903, 905, 907, and 909 in the group, but other terminals 911 and 913 not included in the group may receive signals transmitted for groupcasting. Can't.

The terminal 901 transmitting the groupcast signal can be another terminal in the group, and the resource allocation for the transmission of the groupcast signal is provided by the base station, or the terminal serving as a leader in the group, or the terminal 901 itself You can decide. In various embodiments, the terminals 901, 903, 907, 905, 909, 911, and 913 may include a vehicle terminal. In addition, separate control information, a physical control channel, and/or data may be transmitted for groupcast transmission.

10 illustrates an example of transmitting feedback information indicating success or failure of reception of groupcast data in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 10, terminals 1003, 1005, 1007, and 1009 that have received common data through groupcasting provide feedback information (eg, HARQ-ACK feedback information) indicating whether groupcast data has been successfully received. It can be transmitted to the terminal 1001 transmitting common data. In various embodiments, the terminals 1001, 1003, 1005, 1007, and 1009 may support an LTE and/or NR-based sidelink function. If the terminals 1001, 1003, 1005, 1007, and 1009 support the LTE-based sidelink function, but cannot support the NR-based sidelink function, the terminals 1001, 1003, 1005, 1007, 1009 are the NR-based sidelink functions. Link signals and physical channels cannot be transmitted/received.

In various embodiments of the present disclosure, the sidelink may be used interchangeably with PC5, vehicle to everything (V2X), or device to device (D2D).

9 and 10 illustrate an example of data transmission/reception according to groupcasting, but the embodiments of FIGS. 9 and 10 may be applied even when transmission and reception of a unicast signal is performed between terminals.

11 illustrates a structure of a resource to which a synchronization signal (SS) and a physical broadcast channel are mapped in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 11, a primary synchronization signal (PSS) 1101, a secondary synchronization signal (SSS) 1103, and a PBCH 1105 are mapped to four consecutive OFDM symbols. PSS 1101 and SSS 1103 may be mapped to 12 RBs, and PBCH 1105 may be mapped to 20 RBs. In various embodiments, the resource region in which the PSS (eg, PSS 1101), SSS (eg, SSS 1103), and PBCH (eg, PBCH 1105) are transmitted may be referred to as an SS/PBCH block or a synchronization signal block (SSB). .

In various embodiments, a frequency band of 20 RBs to which an SS/PBCH block is mapped may vary according to a subcarrier spacing (SCS). For example, when the SCS is 15 kHz, the frequency band to which the SS/PBCH block is mapped is 3.6 MHz. As another example, when the SCS is 30 kHz, the frequency band to which the SS/PBCH block is mapped is 7.2 MHz. As another example, when the SCS is 120 kHz, the frequency band to which the SS/PBCH block is mapped is 28.8 MHz. As another example, when the SCS is 240 kHz, the frequency band to which the SS/PBCH block is mapped is 57.6 MHz.

12 illustrates symbols to which an SS/PBCH block is mapped in a slot in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 12, an LTE system employing a subcarrier spacing of 15 kHz and an NR system employing a subcarrier spacing of 30 kHz are illustrated. In the NR system, SS/PBCH blocks 1211, 1213, 1215, and 1217 are different from the location at which cell-specific reference signals (CRSs) 1201, 1203, 1205, and 1207 are always transmitted in the LTE system. Can be transmitted from location. Therefore, the LTE system and the NR system can coexist in one frequency band.

13 illustrates an example of symbols in which an SS/PBCH block may be transmitted according to a subcarrier interval in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 13, the subcarrier interval may be set to one of 15 kHz, 30 kHz, 120 kHz, and 240 kHz, and positions of symbols to which an SS/PBCH block (or SSB) can be transmitted may be determined according to each subcarrier interval. have. 13 illustrates positions of symbols in which SSBs can be transmitted according to subcarrier intervals in symbols within 1 ms, and SSBs are not always required to be transmitted in the region illustrated in FIG. 13. In other words, FIG. 13 exemplifies positions of candidate symbols through which an SSB can be transmitted according to a subcarrier interval.

For example, when the subcarrier interval is 15 kHz 1301, the index of the first symbol of the SS/PBCH block within 1 ms may be {2, 8}.

For example, when the subcarrier interval is 30 kHz 1303, the index of the first symbol of the SS/PBCH block within 1 ms may be {4, 8} in the first slot and {2, 6} in the second slot. .

For example, if the subcarrier interval is 30 kHz 1305, the index of the first symbol of the SS/PBCH block within 1 ms may be {2, 8} in the first slot and {2, 8} in the second slot. .

For example, the subcarrier spacing of the SS/PBCH block may not be 60 kHz 1307.

For example, when the subcarrier interval is 120 kHz, the index of the first symbol of the SS/PBCH block within 0.25 ms may be {4, 8} in the first slot and {2, 6} in the second slot. .

For example, if the subcarrier interval is 240 kHz, the index of the first symbol of the SS/PBCH block within 0.25 ms is {8, 12} in the first slot, {2, 6} in the second slot, and It may be {4, 8, 12} in the th slot and 2 in the fourth slot.

In various embodiments, the positions of symbols to which the SSB can be transmitted may be set in the terminal through system information or dedicated signaling.

14 illustrates another example of symbols in which an SS/PBCH block may be transmitted according to a subcarrier interval in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 14, the subcarrier interval may be set to one of 15 kHz, 30 kHz, 120 kHz, and 240 kHz, and positions of symbols to which an SS/PBCH block (or SSB) can be transmitted may be determined according to each subcarrier interval. have. 14 illustrates positions of symbols in which an SSB can be transmitted according to a subcarrier interval in symbols within a half frame 1400 (ie, 5 ms). In various embodiments, the positions of symbols through which the SSB is transmitted may be set in the terminal through system information or dedicated signaling. The SS/PBCH block does not always have to be transmitted in the region in which the SS/PBCH block (eg, SSB block 1410) can be transmitted, for example, the SS/PBCH block may or may not be transmitted according to the selection of the base station. I can.

In various embodiments of the present disclosure, 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). In addition, a broadcast channel broadcast with a synchronization signal may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel for transmitting feedback information may be referred to as a physical sidelink feedback channel (PSFCH). In various embodiments, PSCCH or PSSCH may be used to transmit feedback information. In various embodiments, PSCCH and PSSCH may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, or NR-PSSCH according to a communication system (eg, NR system, LTE system). In the present disclosure, a sidelink may mean a link between terminals, and a Uu link may mean a link between a base station and a terminal.

Various embodiments may be applied when a base station schedules data transmission on a sidelink for communication between terminals in a wireless communication system.

Definitions of terms used in various embodiments of the present disclosure are as follows:

“Sidelink” refers to a communication method in which a UE communicates directly with another UE without going through a base station.

“Sidelink data” means data transmitted on the sidelink. In various embodiments, “sidelink data” may have the same meaning as “sidelink transmission” and “sidelink data transmission”, and may be used interchangeably.

"Sidelink channel" means a channel between terminals performing communication in the sidelink.

“Wireless access channel” means a channel between a base station and a terminal.

“CSI (channel state information)” means channel state information of a radio access channel. “SL-CSI (sidelink-CSI)” means channel state information of a sidelink channel.

“Sidelink feedback information” refers to feedback information provided by a terminal receiving sidelink data to a terminal transmitting sidelink data. For example, the sidelink feedback information includes channel state information of a sidelink channel, HARQ-ACK feedback information for sidelink data, sidelink scheduling request (SL-SR), sidelink control information (SCI), or sidelink control information (SL-BSR). buffer status report). In various embodiments, “sidelink feedback information” may have the same meaning as “sidelink feedback information”, “sidelink feedback”, and “sidelink feedback control information (SFCI)”, and may be used interchangeably. have. SFCI may be transmitted through a physical sidelink feedback control channel (PSFCH).

"Feedback information on sidelink data" means sidelink feedback information related to sidelink data. For example, feedback information on sidelink data may include HARQ-ACK feedback information on sidelink data.

“HARQ-ACK” means information indicating whether the receiving terminal has successfully received the data transmitted by the transmitting terminal to the receiving terminal. In various embodiments, “HARQ-ACK” may have the same meaning as “HARQ-ACK feedback”, “HARQ-ACK information”, and “HARQ-ACK feedback information”, and may be used interchangeably.

“Sidelink groupcast data” means sidelink data transmitted based on a groupcast method.

Embodiment 1

15 and 16, the terminal transmits HARQ-ACK information (or HARQ-ACK feedback information) for sidelink data transmission to the base station in an RRC connected state according to the first embodiment An example for this is described. In various embodiments, the terminal may transmit a scheduling request for sidelink data transmission to the base station for sidelink data transmission.

15 illustrates an example of a case where a base station schedules sidelink data transmission in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 15, a base station 1511 (e.g., base station 110) can transmit scheduling information for a terminal 1501 (e.g., terminal 120) to transmit data through a sidelink to a terminal 1505 (e.g., terminal 130) to terminal 1501. have. In FIG. 15, the terminal 1501 transmitting data in the sidelink may be in a state of being connected to the base station 1511 (ie, an RRC connection state). For example, the scheduling information received from the base station 1511 may be transmitted through at least one of DCI on the PDCCH, RRC signaling, which is higher level signaling, or MAC CE. The terminal 1501 may transmit data and a control signal in the sidelink based on scheduling information from the base station 1501. Transmission of data and control signals in the sidelink may include at least one of transmission of a physical sidelike share channel (PSSCH) or transmission of a physical sidelink control channel (PSCCH). Here, the PSCCH may include information on PSSCH transmission. The PSCCH may be a physical channel carrying sidelink control information (SCI), and the SCI is a HARQ process ID, MCS, mapping resource information, NDI, RV, retransmission status, and feedback transmission used for PSSCH transmission. It may include at least one of information on time-frequency resources or information on timing for feedback transmission. In various embodiments, as illustrated in FIG. 15, the communication method in which the terminal 1501 receives scheduling information from the base station 1511 and communicates with another terminal (eg, terminal 1505) according to the received scheduling information is'NR mode 1 sidelink. It may be referred to as'communication' or'mode 1 sidelink communication'.

16 illustrates an example of transmitting feedback information on a sidelink in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 16, a terminal 1605 (eg, terminal 130) may transmit control information such as feedback information to a terminal 1601 (eg, terminal 120) through a sidelink, and the terminal 1601 receiving the control information transmits the feedback information. The included control information may be transmitted to the base station 1611 (eg, base station 110), or information generated or determined based on the feedback information may be transmitted to the base station 1611. In various embodiments, the'feedback information on the sidelink' may include at least one of feedback information transmitted through the sidelink or information generated or determined based on the feedback information transmitted through the sidelink. For example, in order for the terminal 1601 to transmit feedback information on the sidelink to the base station 1611, the terminal 1601 must be in a state connected to the base station 1611 (or in an RRC connected state). In various embodiments, feedback information on the sidelink may be transmitted to the base station 1611 through PUCCH and PUSCH. In this disclosure, a shared channel may be used interchangeably with a data channel. When the terminal 1605 transmits control information such as feedback information to another terminal 1601 through the sidelink, control information such as feedback information may be transmitted through a physical sidelink feedback channel (PSFCH) or PSCCH. In various embodiments, the feedback information on the sidelink may also be referred to as sidelink feedback control information (SFCI). Control information such as feedback information may include at least one of HARQ-ACK feedback information for sidelink data transmission shown in FIG. 15 or sidelink channel state information measured based on a sidelink reference signal. In various embodiments, the sidelink channel state information is a measurement such as a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), or radio resource management (RRM) and/or radio link monitoring (RLM). Can contain results.

When the terminal 1601 is connected to the base station 1611 (or the RRC connection state), the base station 1601 may configure one or more component carriers (CCs) for downlink transmission to the terminal 1601. In addition, downlink transmission, uplink transmission slot and symbol may be set in each CC. On the other hand, when the PDSCH, which is downlink data, is scheduled, slot timing information to which the PDSCH is mapped in a specific bit field of the DCI, the position of the start symbol among symbols to which the PDSCH is mapped in the corresponding slot, and the number of symbols to which the PDSCH is mapped. Information can be conveyed. For example, if the DCI delivered in slot n schedules the PDSCH, and K ₀ , which is the slot timing information in which the PDSCH is transmitted, indicates 0, the position of the start symbol is 0, and the number of symbols is 7, the corresponding PDSCH is a slot From symbol 0 of n, 7 symbols may be mapped and transmitted. In various embodiments, in order to set a time domain resource for PDSCH transmission, a table (hereinafter, may be referred to as a PDSCH resource allocation table) indicating information on the number of symbols and a start symbol of a PDSCH in a specific slot / Or can be set in the terminal, the base station in the PDSCH resource allocation table, by instructing the terminal an index value corresponding to the number of symbols and the start symbol of the allocated PDSCH using DCI, to the terminal by using the time domain resource of the PDSCH I can instruct. In various embodiments, the PDSCH resource allocation table may be a fixed value, may be preset, and/or may be set by higher level signaling. The following <Table 3> is an example of a PDSCH resource allocation table indicating slot information to which the PDSCH is mapped, start symbol information, and number or length information of symbols:

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

According to <Table 3>, a maximum of 3 PDSCHs may be allocated in one slot. All three PDSCHs may be related to transmission for one terminal, or may be related to transmission for each different terminal. The base station may transmit the start symbol position and transfer information of each PDSCH to the terminal through higher level signaling and/or DCI. In various embodiments of the present disclosure, the length of the PDSCH or PUSCH may refer to the number of OFDM symbols to which the PDSCH or PUSCH is mapped. In various embodiments, from the time when the downlink data signal PDSCH is transmitted, after the K ₁ slot HARQ-ACK feedback may be transmitted from the terminal to the base station. K ₁ information, which is timing information for transmitting HARQ-ACK feedback, may be carried by DCI. For example, a candidate set of possible K ₁ values may be transmitted by higher signaling, and one K ₁ value may be determined from the candidate set by DCI.

The terminal may transmit HARQ-ACK information including HARQ-ACK feedback bits to the base station. In various embodiments, HARQ-ACK feedback bits may also be referred to as'HARQ-ACK codebook'.

According to an embodiment, the base station is semi-static in which the UE transmits HARQ-ACK feedback bits corresponding to the PDSCH that can be transmitted at a slot and symbol position of a predetermined timing regardless of transmission of the PDSCH. The HARQ-ACK codebook can be set to the terminal. According to the semi-static HARQ-ACK codebook, the number of uplink HARQ-ACK feedback bits to be transmitted may be fixed regardless of the scheduling of the base station. The semi-static codebook is a type-1 HARQ-ACK codebook in the NR system, or may correspond thereto.

According to another embodiment, the base station may set a dynamic HARQ-ACK codebook for the terminal to transmit HARQ-ACK feedback bits corresponding to the transmitted PDSCH to the terminal. In this case, the UE may determine the number of feedback bits and/or feedback bits based on a counter DAI (downlink assignment index) and/or total DAI included in the DCI. According to the flexible HARQ-ACK codebook, the number of uplink HARQ-ACK feedback bits to be transmitted may be determined based on scheduling information of the base station. The flexible HARQ-ACK codebook may be a type-2 HARQ-ACK codebook in the NR system, or may correspond thereto.

When the UE is configured with a semi-static HARQ-ACK codebook, the UE includes a PDSCH resource allocation table including information on the slot information to which the PDSCH is mapped, information on the start symbol of the PDSCH, the number of symbols of the PDSCH and/or length information of the PDSCH, and the PDSCH. The number of feedback bits and/or feedback bits to be transmitted may be determined based on K ₁ candidate values that are timing information of HARQ-ACK feedback for. The PDSCH resource allocation table including slot information to which the PDSCH is mapped, start symbol information of the PDSCH, the number of symbol balls of the PDSCH, or length information of the PDSCH may have a default value or may be set to a terminal by the base station. In addition, K ₁ candidate values, which are timing information of HARQ-ACK feedback for PDSCH, are default values such as {1,2,3,4,5,6,7,8}, or the base station selects a set of K ₁ candidate values. Can be set on the terminal. For example, the base station may set a set of K ₁ candidate values to the terminal as {2,4,6,8,10,12,14,16}, and one of these values may be indicated by DCI. have.

When the set of candidate PDSCH reception okays in the serving cell c is M _A,c , M _A,c may be determined based on the [pseudo-code 1] steps of <Table 4> as follows:

[start pseudo-code 1]
-Step 1: Initialize j to 0 and M _A,c to empty set. Initializes the HARQ-ACK transmission timing index k to 0.
-Step 2: Set R as a set of rows in the PDSCH resource allocation table including slot information to which PDSCH is mapped, start symbol information of PDSCH, number of symbols of PDSCH and/or length information of PDSCH. If the symbol to which the PDSCH indicated by the row included in R can be mapped is set as the UL symbol according to the DL and UL settings set in the upper layer, the row is deleted from R.
-Step 3-1: If the UE can receive a PDSCH for one unicast in one slot and R is not an empty set, k is added to the set M _A,c .
-Step 3-2: If the UE can receive more than one PDSCH for unicast in one slot, R counts PDSCHs that can be allocated to different symbols, and j is added to M _A,c And increase j by 1. Repeat steps 3-2 until there are no more PDSCH positions that can be allocated to the slot.
-Step 4: Start over from Step 2 by increasing k by 1.
[end of pseudo-code 1]

In various embodiments, the steps of pseudo-code 1 may be executed as pseudo-code 2 of Table 5 below:

, the UE determines

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

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

Set

Set

to the cardinality of set

Set k =0 - index of slot timing values

in set

for serving cell

while

Set

to the set of rows provided by PDSCH-TimeDomainResourceAllocation
Set

to the cardinality of

,
Set

- index of row provided by PDSCH-TimeDomainResourceAllocation
if slot

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

or an active UL BWP change on the PCell and slot

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

or the active UL BWP change on the PCell

;
else
while

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

to slot

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

is configured as UL where

is the k-th slot timing value in set

,

;
end if

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

,

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

to the cardinality of

Set

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

while

Set

while

if

for start OFDM symbol index

for row

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

;

end if

;
end while

;
Set

to the smallest last OFDM symbol index among all rows of

;
end while
end if

;
end if
end while
[pseudo-code 2 끝][start pseudo-code 2]
For the set of slot timing values

, the UE determines

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

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

Set

Set

to the cardinality of set

Set k = 0-index of slot timing values

in set

for serving cell

while

Set

to the set of rows provided by PDSCH-TimeDomainResourceAllocation
Set

to the cardinality of

,
Set

-index of row provided by PDSCH-TimeDomainResourceAllocation
if slot

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

or an active UL BWP change on the PCell and slot

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

or the active UL BWP change on the PCell

;
else
while

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

to slot

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

is configured as UL where

is the k -th slot timing value in set

,

;
end if

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

,

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

to the cardinality of

Set

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

while

Set

while

if

for start OFDM symbol index

for row

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

;

end if

;
end while

;
Set

to the smallest last OFDM symbol index among all rows of

;
end while
end if

;
end if
end while
[end of pseudo-code 2]

17 illustrates an example of transmitting feedback information on sidelink data in a wireless communication system according to various embodiments of the present disclosure. Referring to FIG. 17, a terminal 1701 for transmitting sidelink data (eg, terminal 120) may receive the scheduling information 1715 from the base station 1711 (eg, base station 110), and transmit sidelink data to the terminal 1705 (eg, terminal 130) through a sidelink. The terminal 1701 that has transmitted the sidelink data may receive HARQ-ACK feedback information for the sidelink data from the terminal 1705 that has received the sidelink data. Thereafter, the terminal 1701 may transmit the HARQ-ACK feedback to the base station 1711 to which the terminal 1701 is connected. 17 illustrates an example in which HARQ-ACK feedback is transmitted on the sidelink, but this is exemplary, and the embodiments of FIG. 17 may be applied even when other control information is transmitted such as CSI.

As shown in FIG. 17, the terminal 1701 that transmits feedback information on sidelink data to the base station 1711 must be connected to the base station 1711. In other words, in order for the terminal 1701 to transmit the feedback information on the sidelink data to the base station 1711, the terminal 1701 must be in an RRC connection state. While the terminal 1701 is connected to the base station 1711 in an RRC connected state, the terminal 1701 may receive downlink data and uplink scheduling information from the base station 1711. Terminal 1701 receiving downlink data through the PDSCH may transmit HARQ-ACK feedback for the PDSCH to base station 1711, and feed back CSI for downlink to base station 1711 according to configuration and instruction by base station 1711. In addition, the terminal 1701 receiving the uplink scheduling information may transmit uplink data to the base station 1711 through the PUSCH according to the uplink scheduling information. For example, the UE 1701 transmits uplink control information (UCI) including HARQ-ACK feedback and CSI, and an uplink scheduling request (SR) to a physical uplink control channel (PUCCH) or a physical uplink control channel (PUSCH). Uplink shared channel) can be transmitted to the base station 1711.

Downlink data transmission may be performed as follows. The base station transmits data to the terminal through the PDSCH. In order to transmit the PDSCH, the base station may transmit a PDCCH including control information such as scheduling information to the terminal, or pre-transmit scheduling information through higher signaling, and periodic PDSCH transmission and/or semi-periodic transmission through the PDCCH. (semi-persistent) PDSCH transmission can be activated or deactivated. In order to activate or deactivate periodic or semi-periodic PDSCH transmission, the base station may instruct the terminal to activate or deactivate by setting values of specific bit fields of the DCI carried by the PDCCH to specific values.

The UE may receive the PDSCH and decode at least one TB carried in the PDSCH. The PDSCH may include one or two TBs, and each TB may be decoded using information such as MCS of scheduling information set to DCI or higher signaling and resource allocation information. In addition, each TB may include one or more code blocks (CBs), and the code block may be a unit that performs channel coding and decoding. While decoding the code blocks, the UE can check the CRC to determine whether decoding for each code block has succeeded or failed, and can determine whether decoding for the entire TB has succeeded or failed by checking the CRC included in the TB. have. In various embodiments, when the CRC is not included in the code block, the UE may determine whether the decoding of the code block is successful using the TB CRC.

18 illustrates an example of division of code blocks and addition of CRC to code blocks in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 18, a CRC 1803 may be added to the last or first part of one transport block 1801 to be transmitted in uplink or downlink. In various embodiments, the CRC 1803 may have 16 bits or 24 bits, or a fixed number of bits, or may have a variable number of bits according to a channel state or quality, and may be used to determine whether channel coding has been successfully performed. have. A block including TB 1801 and CRC 1803 may be divided into a plurality of code blocks 1807, 1809, 1811, and 1813. The maximum size of each code block may be predefined. In this case, the last code block 1813 is smaller in size than other code blocks, or 0, a random value, or 1 is added to the last code block 1813, and the length of the last code block 1813 Can be equal to other code blocks. CRCs 1817, 1819, 1821, and 1823 may be added to each of the divided code blocks. CRCs 1817, 1819, 1821, 1823 may have 16 bits or 24 bits or a predetermined number of bits, and may be used to determine whether channel coding has been successfully performed. According to an embodiment, the CRC 1803 added to the TB and the CRCs 1817, 1819, 1821, and 1823 added to the code block may be omitted depending on the type of channel code to be applied to the code block. According to another embodiment, when a low density parity check (LDPC) code is applied, CRCs 1817, 1819, 1821, 1823) may be added to a code block.

In various embodiments of the present disclosure, terms of retransmission per CB group, retransmission per CBG, partial retransmission, and CBG retransmission may be used interchangeably. In various embodiments, the number of CBGs set from the base station to the terminal or the set maximum number of CBGs may be defined as N_{CBG,max}. Here, N_{CBG,max} may be mixed with NCBG,max. In addition, the number of CBs included in the scheduled TB may be defined as C. In this case, when TB is scheduled, the number M of CBGs may be determined as M=min(NCBG,max, C), and min(x,y) may mean a smaller value of x and y. The C CBs included in the TB may be grouped according to the following rules to constitute M CBGs:

개의 CB들을 포함한다.-The first mod (C, M) CBG is ceil (C/M) or

Includes four CBs.

개의 CB들을 포함한다.-The last M-mod (C,M) CBGs are each floor (C/M) or

Includes four CBs.

는 C/M보다 작지 않은 최소 정수를 의미하고, floor(C/M) 또는

는 C/M보다 크지 않은 최대 정수를 의미한다. 예를 들어, C/M이 4.3이라면, ceil(C/M)은 5가 되며, floor(C/M)은 4가 된다. 상기 규칙에 따라 CB들은 순차적으로 앞의 CBG에서부터 그룹핑될 수 있다. Where, ceil(C/M) or

Means the minimum integer not less than C/M, floor(C/M) or

Means the maximum integer not greater than C/M. For example, if C/M is 4.3, ceil(C/M) is 5 and floor(C/M) is 4. According to the above rule, CBs may be sequentially grouped from the previous CBG.

When the maximum number of CBGs set to the terminal is NCBG,max, the DCI transmitted to schedule retransmission per CBG may include NCBG,max bits for CBG transmission information (CBGTI). In various embodiments, the CBG transmission information may indicate CBGs transmitted in current scheduling. For example, when the base station sets NCBG,max=4 to the terminal, one TB may include up to 4 CBGs, and DCI may include 4 bits for CBGTI, and each bit is each CBG Can indicate whether or not is being transmitted. For example, when the CBGTI included in the DCI is 1111 and there are 4 CBGs, the CBGTI may indicate that all CBGs are transmitted because each bit is 1. As another example, when the CBGTI included in the DCI is 1100 and there are 4 CBGs, the CBGTI may indicate that only the first and second CBGs are transmitted.

The MAC (medium access control) protocol may allocate a transport block received at the physical layer to a corresponding HARQ process. When the receiving device receives the TB and scheduling information, if the NDI of the HARQ process is toggled (or if the NDI is different from the previously received NDI), or if the transmission is broadcast transmission, or the TB When is first transmitted, the receiving device may regard the transmission as a new transmission, otherwise, the transmission may be regarded as a retransmission.

The base station may inform the terminal of related configuration and indication information through higher signaling and physical layer control signals so that the terminal transmits HARQ-ACK information on the PDSCH to be transmitted through the downlink to the base station. In various embodiments, the HARQ-ACK information for the PDSCH includes at least one of HARQ-ACK information in units of TB for TBs included in the PDSCH, or HARQ-ACK information in units of CBG when retransmission and feedback in units of CBG are configured. Can include. In various embodiments, higher signaling may include at least one of MAC CE configuration and RRC configuration. The configuration information for HARQ-ACK may include one or more of the following information:

- HARQ process IDs for transmitting HARQ-ACK information

- The number of HARQ processes for transmitting HARQ-ACK information

- Time period for transmitting HARQ-ACK information

- Offset of time for transmitting HARQ-ACK information

- PUCCH format and frequency-time resource for transmitting HARQ-ACK information

- Information on whether HARQ-ACK information is based on a TB unit or a CBG unit

- When HARQ-ACK information is based on a CBG unit, information on the maximum number of CBGs per TB or the number of CBGs or the number of HARQ-ACK bits per TB

In various embodiments, the above-described configuration information for HARQ-ACK may also be applied to sidelink data transmission. Referring to FIG. 17, the terminal 1701 may inform the terminal 1705 of related configuration and indication information through higher signaling and a physical layer control signal so that the terminal 1705 transmits HARQ-ACK information for a PSSCH to be transmitted through the sidelink to the terminal 1701. . In various embodiments, the HARQ-ACK information for the PSSCH is at least one of HARQ-ACK information in TB units of TBs included in the PSSCH, or HARQ-ACK information in CBG units when retransmission and feedback per CBG in the sidelink are set. It may include. In various embodiments, higher signaling in the sidelink may include at least one of MAC CE configuration and PC5-RRC configuration. The related configuration information for the sidelink HARQ-ACK may include one or more of the following information:

- HARQ process IDs for transmitting sidelink HARQ-ACK information

- The number of HARQ processes for transmitting sidelink HARQ-ACK information

- Time period for transmitting sidelink HARQ-ACK information

- Offset of time for transmitting sidelink HARQ-ACK information

- Format and frequency-time resources of PSFCH or PSCCH for transmitting sidelink HARQ-ACK information

- Information on whether HARQ-ACK information is based on a TB unit or a CBG unit

- When HARQ-ACK information is based on a CBG unit, information on the maximum number of CBGs per TB or the number of CBGs or the number of HARQ-ACK bits per TB

In various embodiments, the UE may simultaneously transmit feedback for sidelink data transmission to the base station as shown in FIGS. 15, 16 and 17 together with transmission of uplink control information. In other words, the UE can simultaneously transmit UCI and sidelink feedback. In various embodiments, simultaneous transmission may include at least one of transmission in the same symbol or a case where some or all of the transmission points overlap. In order to transmit sidelink feedback information together with UCI to the base station, one or more of the following methods may be applied.

In FIG. 17, the terminal 1701 connected to the base station 1711 may transmit sidelink data to the terminal 1705 and transmit HARQ-ACK feedback information for the sidelink data transmitted from the terminal 1705 to the base station 1711. In this case, the terminal 1701 may transmit sidelink feedback information together with UCI to be transmitted to the base station 1711. In various embodiments, the terminal 1701 may transmit UCI and sidelink feedback information through PUCCH or PUSCH. A physical channel (eg, PUCCH or PUSCH) through which UCI and sidelink feedback information is transmitted may be determined based on configuration or scheduling information from the base station 1711. Control information for scheduling sidelink transmission from the base station 1711 may include information on PUCCH resources for transmitting sidelink feedback and/or information on timing for transmitting sidelink feedback. Feedback information that the terminal 1701 should transmit to the base station 1711 may vary according to the UCI and sidelink feedback information that the terminal 1701 should transmit to the base station 1711.

When a semi-static HARQ-ACK codebook is configured for UCI transmission (that is, the number of uplink HARQ-ACK feedback bits to be transmitted regardless of the scheduling of the base station 1711 is fixed, or the type-1 HARQ-ACK codebook in the NR system is When configured) and when a flexible HARQ-ACK codebook is configured (that is, the number of uplink HARQ-ACK feedback bits to be transmitted is determined based on the scheduling information of the base station 1711, or a type-2 HARQ-ACK codebook in the NR system) If this is configured), HARQ-ACK feedback for sidelink data may be configured to be transmitted in slot n in which UCI is transmitted for each downlink serving cell configured in UE 1701.

In various embodiments, sidelink feedback information may be appended to the rear or front portion of the HARQ-ACK feedback information for downlink data. The number of bits of the sidelink feedback information is the number of code words set for sidelink transmission (that is, the number of TBs transmitted in one physical channel, for example, one PSSCH), the number of sidelink transmissions set or indicated by the base station. It may be determined based on a combination of one or more of timing, timing for transmitting the sidelink feedback, timing information about when to transmit the sidelink feedback to the base station, or the number of sidelink serving cells configured for sidelink communication.

19 shows an example of a configuration of feedback bits to be transmitted to a base station in an uplink in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 19, bits 1901 of HARQ-ACK feedback information for downlink data and bits 1903 of HARQ-ACK feedback information for sidelink data are concatenated and bits of feedback information to be transmitted through uplink. You can configure them. In other words, bits 1901 of HARQ-ACK feedback information for downlink data and bits 1903 of HARQ-ACK feedback information for sidelink data may be continuous. In various embodiments, bits 1903 of HARQ-ACK feedback information for sidelink data are added to the rear or front part of bits 1901 of HARQ-ACK feedback information for downlink data, and HARQ-ACK for downlink data It may be contiguous with bits 1901 of the feedback information.

In various embodiments, a scheduling request for sidelink retransmission (or transmission) instead of bits 1903 of HARQ-ACK feedback information for sidelink data (hereinafter referred to as a sidelink scheduling request (SL-SR)) Can be) can be applied. In this case, bits 1901 of HARQ-ACK feedback information for downlink data and SL-SR bits are connected to configure bits of feedback information to be transmitted through uplink. In other words, bits 1901 and SL-SR bits of HARQ-ACK feedback information for downlink data may be consecutive. In various embodiments, the SL-SR bits are added after or before bits 1901 of HARQ-ACK feedback information for downlink data, and may be contiguous with bits 1901 of HARQ-ACK feedback information for downlink data. have.

In various embodiments, when the UE needs to transmit HARQ-ACK for downlink data in uplink, the UE may transmit only HARQ-ACK for downlink data in uplink without transmitting sidelink feedback information. In other words, the terminal may not transmit the sidelink feedback information to the base station even if it receives the sidelink feedback information from another terminal. Similarly, when the UE needs to transmit CSI or SR in uplink, the UE may transmit only CSI or SR in uplink without transmitting sidelink feedback information.

In various embodiments, when the terminal needs to transmit sidelink feedback information through uplink, the terminal may transmit only sidelink feedback information to the base station without transmitting HARQ-ACK for downlink data. In other words, after the terminal transmitting the sidelink data receives the feedback information for the sidelink data and/or the sidelink feedback information including the SL-SCI from the terminal receiving the sidelink data, the sidelink feedback information is transmitted to the base station. It may be transmitted as, but may not transmit UCI.

As described above, for uplink control information including feedback information for downlink data and/or feedback information for sidelink data, CRC is added to uplink control information, and uplink control information is added to a channel code such as a polar code. After being encoded based on the base station, it may be transmitted to the base station using a PUCCH format or PUSCH in a resource previously set by the base station or determined based on scheduling information. Whether PUCCH or PUSCH is used may be determined based on the number of bits of the uplink control information and/or uplink scheduling information.

Second embodiment

According to the second embodiment, examples in which the terminal transmits HARQ-ACK information for sidelink data transmission to the base station in consideration of the signal processing time of the terminal in the RRC connected state will be described.

In FIG. 17, the terminal 1701 receiving scheduling information for sidelink transmission from the base station 1711 may receive the sidelink feedback from the terminal 1705 that received the sidelink transmission, and transmit sidelink feedback related information to the base station 1711. Upon receiving the sidelink feedback, the terminal 1701 may require processing time to transmit the sidelink feedback to the base station after receiving the sidelink feedback. In various embodiments, the processing time is the time required for channel estimation for receiving the sidelink feedback, the time required for a process such as decoding the sidelink feedback, or the encoding required to prepare for transmission of the sidelink feedback to the base station 1711. It may include at least one of the time required for. Accordingly, the base station 1711 needs to consider the processing time when scheduling the sidelink transmission to the terminal 1701 and/or when indicating the timing for transmitting the sidelink feedback to the base station 1711. Therefore, after the terminal 1701 receives the sidelink feedback, the minimum processing time required to transmit the sidelink feedback to the base station 1711 needs to be defined, and information about the processing time needs to be shared between the base station 1711 and the terminal 1701. There is.

For example, the processing time may be defined as N symbols or T _msec . N and T may be determined based on a subcarrier interval used for sidelink transmission, a length of an OFDM symbol, a subcarrier interval used for downlink and uplink transmission, or a length of an OFDM symbol. As another example, N and T may be determined based on a combination of at least two of a subcarrier interval used for sidelink transmission, a length of an OFDM symbol, a subcarrier interval used for downlink and uplink transmission, or a length of an OFDM symbol. .

Third embodiment

According to the third embodiment, examples of transmitting groupcast data in the sidelink and transmitting feedback such as HARQ-ACK for groupcast data or sidelink channel status report as shown in FIGS. 9 and 10 are described. Is explained.

20 illustrates an example of a sidelink groupcast in a wireless communication system according to various embodiments of the present disclosure.

Referring to FIG. 20, terminals 2001, 2003, 2005, 2007, 2009, 2011, and 2013 may all belong to the same group. When the transmitting terminal 2001 transmits data in the groupcast, all terminals in the group may not need to receive the groupcast data transmitted by the transmitting terminal 2001. For example, the groupcast data transmitted by the transmitting terminal 2001 may be within a certain distance 2015 from the transmitting terminal 2001, or may be valid data only for terminals located in the same area among preset areas. Accordingly, the transmitting terminal 2001 may receive HARQ-ACK feedback for sidelink groupcast data only from terminals 2003, 2005, 2007, and 2009 within a predetermined distance 2015.

In FIG. 20, terminals 2003, 2005, 2007, 2009, 2011, and 2013 may be configured to receive sidelink groupcast data from terminal 2001. In order to transmit sidelink groupcast data, the terminals 2003, 2005, 2007, 2009, 2011, 2013 may receive control information. For example, control information may be obtained by receiving PSCCH and/or SCI. As another example, the control information may be obtained by receiving at least one SCI. Terminals 2003, 2005, 2007, 2009, 2011, and 2013 may decode control information to obtain target distance or location information for sidelink groupcast data. In various embodiments, information that can be obtained by decoding control information may be referred to as'indication information'. The indication information may include at least one of the following contents:

- Location information of the terminal that transmitted the control information (eg terminal 2001)

- Position ID information of the position in which the terminal that transmitted the control information is located (for example, the ID and/or index value of the region where the position where the terminal is located)

- Location information of the position at which the terminal to transmit feedback information should be located among terminals that have received control information

- Location ID information of the position in which the terminal to transmit the feedback information should be located among the terminals receiving control information (e.g., the ID and/or index of the region in which the position where the terminal receiving the sidelink groupcast data should be located belongs value)

The terminal may acquire measurement information based on a decoding reference signal (DMRS) for decoding at least one of control information or data scheduled by the control information. In various embodiments, measurement information may be obtained by measuring at least one of the following physical channels or physical signals:

- PSCCH

- DMRS for PSCCH

- PSSCH

- DMRS for PSSCH

- Reference signal for positioning

- Signal for synchronization acquisition (e.g. SSB, PSS, SSS, etc. for sidelink)

- Signals carried from a global positioning system (GPS) or a global navigation satellite system (GNSS)

- Signal for positioning

In addition, in various embodiments, the measurement information may have the same meaning as the following terms, and may be replaced by the following terms:

- Received signal strength

- Information on the channel status between the sending device and the receiving device

- Information about the distance between the sending device and the receiving device

- The location of the receiving device

In FIG. 20, terminals 2003, 2005, 2007, 2009, 2011, and 2013 receive control information and/or PSCCH for sidelink groupcast from terminal 2001, and the above-described indication information and measurement information based on the received information Can be identified. Terminals 2003, 2005, 2007, 2009, 2011, and 2013 may determine whether to transmit HARQ-ACK feedback for the received PSSCH based on the indication information and measurement information. For example, when a parameter indicating that a groupcast signal is transmitted from the resource pool received by the terminal (eg, GroupCastEnabled) is enabled or is set to an activated value (eg 1), the terminal is used for sidelink groupcast. Receiving the PSCCH, identifying indication information from the information of the PSCCH, identifying measurement information from the strength of the received signal measured from the DMRS of the PSCCH and/or the DMRS of the PSSCH, or the location information of the terminal obtained from the GPS signal, and indicating Information and measurement information can be compared. The UE may compare indication information and measurement information to determine whether to transmit HARQ-ACK feedback for the PDSSCH. In various embodiments, the UE may determine whether to transmit HARQ-ACK for the PSSCH when it is indicated by the SCI bit field that the PSCCH is for groupcast.

For example, in FIG. 20, even though terminals 2003, 2005, 2007, 2009, 2011, and 2013 receive control information and/or PSCCH for sidelink groupcast from terminal 2001, terminals 2011 and 2013 It may be determined not to perform HARQ-ACK feedback according to the comparison result of the measurement information. In this case, UEs 2011 and 2013 may not transmit HARQ-ACK feedback for sidelink groupcast data.

In various embodiments, the indication information may include an ID and/or an index value of a region to which a transmitting terminal that has transmitted sidelink groupcast data belongs, and may be indicated by SCI. The measurement information may include an ID and/or an index value of an area to which the receiving terminal belongs, determined by the receiving terminal receiving the sidelink groupcast data by measuring the location of the receiving terminal. When the indication information and the measurement information match, the receiving terminal may transmit the HARQ-ACK feedback to the transmitting terminal.

In various embodiments, the indication information is (x, y) indicating a combination of an x-axis and y-axis value of a region to which the transmitting terminal that transmitted the sidelink groupcast data belongs, or an index indicating east-west and an index indicating north-south. It may include a coordinate value, and the indication information may be indicated by SCI. The measurement information is a combination of the x-axis and Y-axis values of the region to which the receiving terminal belongs, or an index representing the east and west-an index representing the north and south, determined by the receiving terminal receiving the sidelink groupcast data by measuring the location of the receiving terminal. It may include the indicated (a, b) coordinate values. The receiving terminal may determine whether to transmit HARQ-ACK feedback based on the indication information and measurement information. For example, when the absolute value of the difference between x and a is less than N and the absolute value of the difference between y and b is less than M, the receiving terminal may transmit HARQ-ACK feedback to the transmitting terminal. In other words, when |x-a|≤N and |y-b|≤M are satisfied, the receiving terminal may transmit HARQ-ACK feedback to the transmitting terminal. As another example, when |x-a|<N and |y-b|<M are satisfied, the receiving terminal may transmit HARQ-ACK feedback to the transmitting terminal. N and M may be the same value or may be different values. Further, N and M may be fixed values (eg, 1). The fixed value is not limited to 1, and may be various values. In various embodiments, N and M may be set in the receiving terminal by higher level signaling from the base station and/or the transmitting terminal.

In various embodiments, the receiving terminal receiving the sidelink groupcast data may determine a time-frequency resource to transmit HARQ-ACK based on the measurement information. For example, resources set in the receiving terminal may include resources for transmission of a physical sidelink feedback channel (PSFCH). The receiving terminal may determine a resource for transmitting a PSFCH including HARQ-ACK feedback information based on the indication information and measurement information. For example, the ID and/or index of the area in which the transmitting terminal that transmitted the sidelink groupcast data is located, indicated by the indication information, and the ID and/or index of the area in which the receiving terminal indicated by the measurement information, are matched. In this case, the receiving terminal may transmit the PSFCH in PSFCH resource 1, and if it does not match, it may transmit the PSFCH in PSFCH resource 2. The PSFCH resource #1 and the PSFCH resource #2 include time-frequency resources, and may be preset in the transmitting terminal and the receiving terminal, set by higher-level signaling, or may be flexibly indicated by DCI and/or SCI.

Embodiment 4

According to the fourth embodiment, when a sidelink transmits groupcast data and transmits a feedback such as HARQ-ACK for groupcast data or sidelink channel state information, as shown in FIGS. 9 and 10, the transmit power of the feedback Examples are described for determining

In FIG. 20, terminals 2003, 2005, 2007, 2009, 2011, and 2013 may receive control information or PSCCH for sidelink groupcast from terminal 2001, and identify indication information and measurement information based on the received information. have. In various embodiments, the receiving terminals 2003, 2005, 2007, 2009, 2011, 2013 may determine the power to be used to transmit the sidelink feedback based on the indication information and/or measurement information. For example, a receiving terminal receiving sidelink data may measure the strength of a signal (ie, a received signal) received by the receiving terminal and determine the transmit power of the PSFCH based on the measured strength of the received signal.

Embodiment 5

According to the fifth embodiment, examples for determining timing at which the HARQ-ACK feedback in the sidelink is transmitted to the base station according to the scheduling of the base station are described.

In various embodiments, in sidelink communication, the transmitting terminal transmits data for unicast or groupcast to the receiving terminal, and the receiving terminal transmits HARQ-ACK information for the received unicast or groupcast data to the transmitting terminal. Can be transmitted. In mode 2 sidelink communication, the transmitting terminal determines the resource to transmit data without scheduling of the base station, but in mode 1 sidelink communication, the transmitting terminal receives scheduling information for scheduling resources for sidelink transmission from the base station, and is scheduled. Sidelink data transmission can be performed in the resource.

Scheduling information from the base station for mode 1 sidelink communication may be obtained by the transmitting terminal receiving downlink control information (DCI), and such DCI may include at least one of the following parameters. have:

-Carrier indicator: Can be used to schedule a sidelink of another carrier in a situation in which carrier aggregation (CA) is applied.

-Lowest index of subchannel allocation for initial transmission: Can be used for frequency resource allocation for initial transmission.

-Information to be included in the sidelink control information

-Frequency resource allocation information: may include resource allocation or resource reservation information for initial transmission, retransmission, and subsequent N-th transmission.

-Time interval information between initial transmission and retransmission

-Information on the sidelink slot structure: It may include information on which slot and which symbols can be used for the sidelink.

-HARQ-ACK/CSI feedback timing information: May include timing information for transmitting HARQ-ACK or CSI feedback in the sidelink to the base station.

-Recipient ID: ID information on receiving terminals

-Quality of service (QoS) information (e.g., priority): Information on which priority data to transmit

-Downlink assignment index (DAI) or sidelink assignment index (SAI) for sidelink.

-PUCCH resource indicator (resource indicator): may indicate the resource of the PUCCH to be transmitted HARQ-ACK feedback.

In various embodiments, the HARQ-ACK/CSI feedback timing information is, in the sidelink, the transmitting terminal receives HARQ-ACK feedback information for sidelink data transmission from the receiving terminal, or sidelink CSI feedback information, which is sidelink channel information. When received, it is possible to indicate information about a time point for transmitting the feedback information to the base station. In order to deliver the feedback information to the base station, one or more of the following methods may be applied:

1.Transmits HARQ-ACK feedback information and/or sidelink CSI feedback information for sidelink data transmission to the base station through uplink PUCCH or PUSCH at a certain point in the bitfield of the HARQ-ACK/CSI feedback timing information of DCI How to dictate what to do. In this method, an offset (or time difference) from a slot in which the scheduling DCI is transmitted to a slot in which a PUCCH or PUSCH including feedback information is transmitted may be indicated. In various embodiments, a slot in which DCI is transmitted and a PUCCH or PUSCH A slot to which is transmitted may include a sub-slot having a length smaller than that of the slot, and the offset may include an index difference for the subslots. Alternatively, the base station transmits a set of possible values among the offset values to the sidelink data transmission terminal through higher layer signaling, and indicates one value from the set transmitted through the higher layer signal through DCI, thereby giving the transmitting terminal an accurate Offset value can be indicated. In various embodiments, a set of possible values among offset values transmitted by the base station through higher layer signaling may include different offset values according to subcarrier spacing (or numerology).

2. Method in which the transmitting terminal transmits the HARQ-ACK or CSI feedback of the sidelink to the base station at a time point previously promised by the base station and the transmitting terminal.

In various embodiments, the SAI may cause the transmitting terminal to count the amount or number of receiving sidelink scheduling from the base station. The SAI may include at least one of a counter SAI and a total SAI. In various embodiments, in transmission of data that needs to transmit feedback to the base station at the same time in sidelink data transmission, the base station uses the SAI included in each sidelink scheduling DCI to indicate to the transmitting terminal the scheduling order of the data. I can. In various embodiments, the total SAI value may or may not be used. That is, in the SAI, the HARQ-ACK bit for data transmission for the sidelink indicated by the currently scheduled DCI should be mapped to the number of bits among all HARQ-ACK feedbacks to be transmitted on the PUCCH or PUSCH at the same time. I can. Alternatively, the SAI indicates which bits of the HARQ-ACK bit for data transmission for the sidelink indicated by the currently scheduled DCI should be mapped to the number of bits among all HARQ-ACK feedbacks to be transmitted in the PUCCH or PUSCH at the same time. I can. Alternatively, the SAI may indicate how many bits of HARQ-ACK feedback to be transmitted on the PUCCH or PUSCH at a specific point in time should be transmitted. For example, the base station schedules the sidelink data transmission in which the sidelink HARQ-ACK feedback is transmitted using the PUCCH or PUSCH of slot 2n in slot n+1, slot n+2, slot n+3, and slot n+. In case 4 is transmitted to each transmitting terminal, SAI values included in the scheduling DCI may indicate 0, 1, 2, and 3, respectively. Therefore, even if the terminal does not receive DCI in slots n+2 and slot n+3, respectively, based on this SAI, 4-bit HARQ-ACK can be transmitted to the base station in slot 2n, and the base station successfully 4-bits HARQ-ACK feedback information can be received. When the SAI is absent, the UE has not received two DCIs, so only 2 bits of HARQ-ACK feedback will be transmitted, but the base station receives the HARQ-ACK feedback assuming that the HARQ-ACK feedback is 4 bits. , The base station may not be able to correctly decode the HARQ-ACK feedback.

In various embodiments, a transmitting terminal receives a DCI including HARQ-ACK/CSI feedback timing information from a base station, and is required for signal processing from DCI reception to transmitting a PUCCH or PUSCH including HARQ-ACK or CSI feedback information. There may be a certain amount of time. The minimum time required for signal processing can be calculated by taking one or more of the following times into account:

-Time required for the transmitting terminal to receive and process the PDCCH

-Time required for the transmitting terminal to sense the sidelink channel

-Time required for the transmitting terminal to transmit the sidelink data PSSCH

-Time required for the receiving terminal to receive the PSSCH and transmit the feedback on the PSSCH

-Location of the slot in which the resource of the PSFCH to which feedback can be transmitted is set according to the resource pool setting

-Time required for the transmitting terminal to receive the PSFCH and to transmit the PSFCH to the base station using PUCCH or PUSCH

The base station is required to transmit HARQ-ACK/CSI feedback timing information including a value greater than or equal to the calculated minimum time to the transmitting terminal in consideration of the minimum time required for signal processing by the transmitting terminal. When the HARQ-ACK/CSI feedback timing information includes a value smaller than the minimum time required for signal processing by the transmitting terminal, the transmitting terminal may not transmit valid HARQ-ACK/CSI feedback information to the base station.

In various embodiments, scheduling from the base station may include at least one of scheduling for single sidelink transmission, periodic transmission or semi-persistent (SPS) scheduling, or configured grant sidelink scheduling. The scheduling method may be classified by an indicator included in the DCI, an RNTI scrambled in the CRC added to the DCI, or an ID value. A bit (eg, 0 bit) may be added to the DCI so that the size of the DCI is the same as the size of another DCI format such as downlink scheduling or DCI for uplink scheduling.

The transmitting terminal may receive the DCI for sidelink scheduling from the base station, transmit a PSCCH including sidelink scheduling information to the receiving terminal, and transmit a PSSCH, which is data scheduled by the PSCCH, to the receiving terminal. The sidelink scheduling information may be sidelink control information (SCI), and the SCI may include at least one of the following parameters:

-HARQ process number: HARQ process ID for HARQ-related operation of transmitted data

-New data indicator (NDI): information indicating whether the currently transmitted data is new data

-Redundancy version: Information on parity bits used for mapping data to which channel coding is applied.

-Layer-1 source ID: ID information at the physical layer of the transmitting terminal

-Layer-1 destination ID: ID information at the physical layer of the receiving terminal

-Frequency-domain resource assignment for scheduling PSSCH: frequency domain resource configuration information of data to be transmitted

-MCS: Modulation order and coding rate information

-QoS indication: includes at least one of priority, target latency/delay, target distance, and target error rate wnd.

-Antenna port(s): antenna port information for data transmission

-DMRS sequence initialization: Includes information such as an ID value for initialization of a DMRS sequence.

-PTRS-DMRS association: Contains information on PTRS mapping.

-CBGTI: Can be used as an indicator for retransmission in units of CBG.

-Resource reservation: information for resource reservation

-Time gap between initial transmission and retransmission: Time interval information between initial transmission and retransmission

-Retransmission index: an indicator to distinguish retransmission

-Transmission format/cast type indicator: Classification indicator of transmission format or unicast/groupcast/broadcast

-Zone (zone ID): location information of the transmitting terminal

-NACK distance: a reference indicator used to determine whether the receiving terminal should transmit HARQ-ACK/NACK

-HARQ feedback indication: contains whether or not HARQ feedback should be transmitted.

-Time-domain resource assignment for scheduling PSSCH: time-domain resource information of transmitted sidelink data

-Second SCI indication: In the case of second-stage control information, an indicator including mapping information of the second SCI

-DMRS pattern (pattern): DMRS pattern (eg, location of a symbol to which DMRS is mapped) information

In various embodiments, the above-described control parameters may be transmitted to the receiving terminal through one SCI, or may be transmitted through two or more SCIs. Transmission of control parameters through two SCIs may be referred to as a two-stage SCI transmission method.

Embodiment 6

According to the sixth embodiment, a method for determining a frequency resource through which HARQ-ACK feedback in a sidelink is transmitted to a base station according to scheduling of a base station is described.

In various embodiments, in sidelink communication, the transmitting terminal transmits data for unicast or groupcast to the receiving terminal, and the receiving terminal transmits HARQ-ACK information for the received unicast or groupcast data to the transmitting terminal. Can be transmitted. In mode 2 sidelink communication, the transmitting terminal determines the resource to transmit data without scheduling of the base station, but in mode 1 sidelink communication, the transmitting terminal receives scheduling information for scheduling resources for sidelink transmission from the base station, and is scheduled. Sidelink data transmission can be performed in the resource.

The scheduling information from the base station for sidelink communication through Mode 1 may be obtained by receiving downlink control information (DCI), and the DCI may include the following information.

-Carrier indicator: Can be used to schedule a sidelink of another carrier in a situation in which carrier aggregation (CA) is applied.

-Lowest index of subchannel allocation for initial transmission: Can be used for frequency resource allocation for initial transmission.

-Information to be included in the sidelink control information

-Frequency resource allocation information: may include resource allocation or resource reservation information for initial transmission, retransmission, and subsequent N-th transmission.

-Time interval information between initial transmission and retransmission

-Information on the sidelink slot structure: It may include information on which slot and which symbols can be used for the sidelink.

-HARQ-ACK/CSI feedback timing information: May include timing information for transmitting HARQ-ACK or CSI feedback in the sidelink to the base station.

-Recipient ID: ID information on receiving terminals

-Quality of service (QoS) information (e.g., priority): Information on which priority data to transmit

-Downlink assignment index (DAI) or sidelink assignment index (SAI) for sidelink.

-PUCCH resource indicator (resource indicator): may indicate the resource of the PUCCH to be transmitted HARQ-ACK feedback.

In various embodiments, the PUCCH resource indicator is, when the transmitting terminal receives HARQ-ACK feedback information for sidelink data transmission from the receiving terminal in the sidelink, or sidelink CSI feedback information, which is sidelink channel information, is received, Information on frequency resources to be transmitted to the base station through the PUCCH of the received feedback information can be indicated. The PUCCH resource indicator may indicate one PUCCH among one or more PUCCH resources configured through higher layer signaling (the configured PUCCH resource may include a PUCCH resource for transmitting sidelink HARQ-ACK feedback information to the base station). .

If a plurality of PUCCHs are instructed to be transmitted at the same time point or in one slot, the base station and/or the transmitting terminal may select (determine) the PUCCH resource to transmit the actual feedback information based on the following priority. In various embodiments, even if one specific PUCCH resource is determined, the feedback information transmitted in the corresponding PUCCH resource may include a bundle of feedback information instructed to be transmitted in various PUCCH resources.

One. PUCCH resource indicated by the DCI delivered last

2. PUCCH resource indicated by DCI delivered at the lowest serving cell index

3. DCI delivered for Uu link scheduling

4. DCI delivered for SL link scheduling

For example, DCI instructed to transmit HARQ-ACK feedback for the first PSSCH related to sidelink transmission scheduled in slot n through the first PUCCH resource in slot 2n, and sidelink transmission scheduled in slot n+1 When the DCI instructs that the HARQ-ACK feedback for the second PSSCH related to is transmitted through the second PUCCH resource in slot 2n, the transmitting terminal uses the second PUCCH resource in slot 2n to HARQ-ACK for the first PSSCH. The feedback and HARQ-ACK feedback information for the second PSSCH may be multiplexed, and multiplexed HARQ-ACK feedback information may be transmitted. In various embodiments, multiplexing of a plurality of information elements may mean concatenating a plurality of information elements, channel-coding the concatenated information elements, and transmitting them.

As another example, DCI instructed to transmit HARQ-ACK feedback for the first PDSCH related to downlink transmission scheduled in slot n through the first PUCCH resource in slot 2n, and sidelink transmission scheduled in slot n+1 When the DCI instructs that the HARQ-ACK feedback for the first PSSCH related to is transmitted through the second PUCCH resource in slot 2n, the transmitting terminal uses the second PUCCH resource in slot 2n to HARQ-ACK for the first PDSCH. The feedback and HARQ-ACK feedback information of the first PSSCH may be multiplexed, and the multiplexed HARQ-ACK feedback information may be transmitted. In other words, the transmitting terminal may transmit the HARQ-ACK feedback in the second PUCCH resource configured to transmit the sidelink feedback to the base station.

As another example, the DCI instructed that HARQ-ACK feedback for the first PDSCH related to the downlink transmission scheduled in slot n is transmitted through the first PUCCH resource in slot 2n, and the second related to the sidelink transmission scheduled in slot n When the DCI instructs that HARQ-ACK feedback for 1 PSSCH is transmitted through the second PUCCH resource in slot 2n, DCI so that HARQ-ACK feedback for the first PDSCH and HARQ-ACK feedback for the first PSSCH are simultaneously transmitted. Although scheduled by, since the Uu link scheduling DCI takes precedence over the SL link scheduling DCI, the transmitting terminal uses the first PUCCH resource in slot 2n to provide HARQ-ACK feedback for the first PDSC and HARQ-ACK for the first PSSCH. Feedback information may be multiplexed and multiplexed HARQ-ACK feedback information may be transmitted. In other words, the transmitting terminal may transmit the HARQ-ACK feedback in the first PUCCH resource configured to transmit the feedback for downlink data transmission to the base station.

21 is a flowchart of a terminal for sidelink communication in a wireless communication system according to various embodiments of the present disclosure. 21 illustrates an operation method of terminal 120 or terminal 1701.

Referring to FIG. 21, in step 2101, a terminal may receive an SFCI from another terminal. For example, the terminal may transmit sidelink data to another terminal and receive SFCI including feedback information on the sidelink data.

In step 2103, the terminal may identify a resource region for transmitting SFCI to the base station. For example, the UE may identify a PUCCH resource or PUSCH resource for transmitting SFCI to the base station and a slot timing for transmitting SFCI based on the control information received from the base station.

In step 2105, the terminal may transmit control information including SFCI and UCI to the base station in the resource region. In other words, the UE may transmit SFCI and UCI together to the base station in the identified resource region.

In various embodiments, the SFCI is an SL-SR for requesting scheduling of resources for transmission or retransmission in a sidelink, HARQ-ACK for sidelink data, SL-CSI, which is channel state information for a sidelink channel, Alternatively, it may include at least one of a sidelink-buffer status report (SL-BSR) indicating the amount of data to be transmitted by another terminal.

In various embodiments, the UCI may include at least one of SR for requesting scheduling of resources for transmission or retransmission by the terminal, HARQ-ACK for downlink data, or channel state information in a radio access channel.

In various embodiments, bits of HARQ-ACK for downlink data and bits of SL-SR may be consecutive to each other in control information. In other words, bits of HARQ-ACK for downlink data and bits of SL-SR may constitute contiguous bits. In this case, the bits of the SL-SR may be located before or after the bits of the HARQ-ACK for downlink data.

In various embodiments, bits of HARQ-ACK for downlink data and bits of SL-BSR may be consecutive to each other in control information. In other words, bits of HARQ-ACK for downlink data and bits of SL-BSR may constitute contiguous bits. In this case, the bits of the SL-BSR may be located before or after the bits of the HARQ-ACK for downlink data.

In various embodiments, the HARQ-ACK bits for downlink data and the HARQ-ACK bits for sidelink data may be consecutive to each other in control information. In other words, HARQ-ACK bits for downlink data and bits of HARQ-ACK for sidelink data may constitute consecutive bits. In this case, bits of HARQ-ACK for sidelink data may be located before or after HARQ-ACK bits for downlink data.

In various embodiments, SFCI may be transmitted from another terminal to the terminal through the PSFCH.

In various embodiments, the transmit power of the PSFCH may be determined based on the strength of a signal received by another terminal. Signals are PSCCH, DMRS for PSCCH, PSSCH, DMRS for PSSCH, a reference signal for positioning or a signal for positioning, a signal for obtaining synchronization in a sidelink, a global positioning system (GPS) or a global navigation satellite system (GNSS). ) May include at least one of signals carried from.

In various embodiments, the resource region may be included in a PUCCH resource region or a PUSCH resource region.

In various embodiments, at least one of the symbols in which SCFI is transmitted in the resource domain and at least one of the symbols in which UCI is transmitted in the resource domain are the same, the frequency resource in which the SCFI is transmitted in the resource domain, and the UCI in the resource domain Frequency resources in which are transmitted may be different from each other. In other words, SFCI may be frequency multiplexed in PUSCH resources or PUCCH resources.

In various embodiments, a frequency resource in which SCFI is transmitted in a resource domain, and at least a part of a frequency resource in which UCI is transmitted in a resource domain are overlapped, symbols in which SCFI is transmitted in a resource domain, and UCI in a resource domain. The symbols can be different from each other. In other words, SFCI may be time multiplexed in PUSCH resources or PUCCH resources (time multiplexed).

In various embodiments, the UE receives a PUCCH resource or a PUSCH resource for transmitting the SCFI to the base station, and first information indicating slot timing, and based on the first information, a PUCCH resource in a slot indicated by the slot timing. Alternatively, a resource region corresponding to a PUSCH resource may be determined, and control information including SFCI and UCI may be transmitted to the base station through a PUCCH resource or a PUSCH resource in a slot. The first information may be DCI.

In various embodiments, the UE receives a PUCCH resource or a PUSCH resource for transmitting UCI to the base station, and second information indicating slot timing, and based on the second information, a PUCCH resource in a slot indicated by the slot timing. Alternatively, a resource region corresponding to a PUSCH resource may be determined, and control information including SFCI and UCI may be transmitted to the base station through a PUCCH resource or a PUSCH resource in a slot. The second information may be DCI.

In various embodiments, the first information and the second information may be the same or different.

In various embodiments, the resource region includes a slot, and the UE identifies a first slot timing for transmitting SFCI, identifies a second slot timing for transmitting UCI, and identifies a first slot timing and a second slot. In response to identifying that the timing indicates the slot, SFCI and UCI can be transmitted in the slot.

In various embodiments, the timing for transmitting the SFCI to the base station may be determined based on the processing time required to transmit the SFCI to the base station after the terminal receives the SFCI from another terminal.

22 is a flowchart of a terminal for sidelink groupcast in a wireless communication system according to various embodiments of the present disclosure. 22 illustrates a method of operating terminal 120 or terminal 1701.

Referring to FIG. 22, in step 2201, a terminal may receive an SCI including location information for at least one terminal from another terminal. The location information on at least one terminal may include location information on the terminal and other terminals.

In step 2203, the terminal may acquire measurement information related to the strength of a signal received from another terminal. For example, the terminal may measure the strength of a signal received from another terminal and obtain measurement information based on the measured signal strength.

In step 2205, the terminal may determine whether to transmit feedback information for sidelink groupcast data received from another terminal based on the location information and the measurement information. For example, the terminal may determine whether the sidelink groupcast data is valid data for the terminal based on the measurement information and location information, and if the data is valid, the terminal may determine to transmit the feedback information. In contrast, if the data is not valid, the terminal may determine not to transmit the feedback information.

In various embodiments, the location information is information about a position of another terminal, an ID of an area in which the other terminal is located, information about a position at which the terminal is required to transmit feedback information for sidelink groupcast data, or the terminal It may include at least one of IDs of a region where feedback information on sidelink groupcast data is requested to be transmitted.

In various embodiments, the measurement information is among information about the strength of a signal received from another terminal, information about a channel state of a channel between another terminal and a terminal, information about a distance between another terminal and a terminal, or information about the location of the terminal. It may include at least one.

In various embodiments, the terminal identifies the ID of the area where the other terminal is located, determines the ID of the area where the terminal is located, based on the information on the location of the terminal, and determines the ID of the area where the other terminal is located and the area where the terminal is located. Based on the determination that the ID of is matched, it is determined to transmit the feedback information on the sidelink groupcast data received from the other terminal, and the feedback information may be transmitted to the other terminal.

In various embodiments, the terminal identifies the coordinate value of the area where the other terminal is located, and based on the information on the location of the terminal, identifies the coordinate value of the area where the terminal is located, and the coordinate value of the area where the other terminal is located and the terminal Based on the determination that the difference in the coordinate value of the location in which the coordinate value is less than the threshold value, it is determined to transmit the feedback information for the sidelink groupcast data received from the other terminal, and the feedback information can be transmitted to the other terminal. The threshold value may be set in the terminal by higher level signaling from the base station or another terminal.

In various embodiments, the terminal identifies the ID of the area where the other terminal is located, determines the ID of the area where the terminal is located, based on the information on the location of the terminal, and determines the ID of the area where the other terminal is located and the area where the terminal is located. If the IDs of are identical, feedback information may be transmitted to another terminal through a first physical sidelink feedback channel (PSFCH). If the ID of the region where the other terminal is located and the ID of the region where the terminal is located do not match, the terminal may transmit feedback information to the other terminal through the second PSFCH. The first PSFCH and the second PSFCH may be different from each other.

In various embodiments, a signal received from another terminal is a PSCCH, a DMRS for a PSCCH, a PSSCH, a DMRS for a PSSCH, a reference signal for positioning or a signal for positioning, a signal for obtaining synchronization in a sidelink, a global positioning system) or a signal carried from a global navigation satellite system (GNSS).

In various embodiments, the feedback information includes an SL-SR for requesting scheduling of resources for transmission or retransmission in a sidelink, HARQ-ACK for sidelink groupcast data, and SL, which is channel state information for a sidelink channel. It may include at least one of CSI or a sidelink-buffer status report (SL-BSR) indicating the amount of data to be transmitted by the terminal.

The methods according to the embodiments described in the claims or the 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 are configured to be executable by one or more processors in an electronic device (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.

These programs (software modules, software) 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 forms of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is through a communication network composed of 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 combination thereof. It may be stored in 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 the communication network may access a device performing an embodiment of the present disclosure.

In the above-described specific embodiments of the present disclosure, components included in the disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is limited to the described embodiments and should not be determined, and should be determined by the scope of the claims to be described later as well as the scope and equivalents of the claims.

Claims (24)

In the device of the terminal in a wireless communication system,
A transceiver for receiving sidelink feedback control information (SFCI) from another terminal,
Including at least one processor for identifying a resource region for transmitting the SFCI to the base station,
The transceiver is an apparatus for transmitting control information including the SFCI and uplink control information (UCI) to the base station in the resource region.
The method according to claim 1, wherein the SFCI is a sidelink scheduling request (SL-SR) for requesting scheduling of a resource for transmission or retransmission in a sidelink, hybrid automatic repeat request-acknowledgement (HARQ-ACK) for sidelink data. , Including at least one of sidelink-channel state information (SL-CSI), which is channel state information for a sidelink channel, or a sidelink-buffer status report (SL-BSR), indicating an amount of data to be transmitted by the other terminal,
The UCI includes at least one of SR for requesting scheduling of resources for transmission or retransmission by the terminal, HARQ-ACK for downlink data, or channel state information (CSI) for a radio access channel.
The apparatus of claim 2, wherein bits of HARQ-ACK for the downlink data and bits of the SL-SR are contiguous with each other in the control information.
The apparatus of claim 2, wherein bits of HARQ-ACK for the downlink data and bits of the SL-BSR are contiguous with each other in the control information.
The apparatus of claim 2, wherein HARQ-ACK bits for the downlink data and HARQ-ACK bits for the sidelink data are consecutive to each other in the control information.
The apparatus of claim 1, wherein the SFCI is transmitted from the other terminal to the terminal through a physical sidelink feedback channel (PSFCH).
The method of claim 6, wherein the transmission power of the PSFCH is determined based on the strength of a signal received by the other terminal,
The signal is a PSCCH (physical sidelink control channel), a demodulation reference signal (DMRS) for the PSCCH, a physical sidelink shared channel (PSSCH), a DMRS for the PSSCH, a reference signal for positioning or a signal for positioning, synchronization in the sidelink An apparatus including at least one of a signal for acquisition, a global positioning system (GPS), or a signal carried from a global navigation satellite system (GNSS).
The apparatus of claim 1, wherein the resource region is included in a resource region of a physical uplink control channel (PUCCH) or a resource region of a physical uplink control channel (PUSCH).
The method according to claim 1, wherein at least one of symbols in which the SCFI is transmitted in the resource region and at least one of symbols in which the UCI is transmitted in the resource region are the same,
A frequency resource through which the SCFI is transmitted in the resource region and a frequency resource through which the UCI is transmitted in the resource region are different from each other.
The method according to claim 1, wherein at least a part of a frequency resource through which the SCFI is transmitted in the resource domain and a frequency resource through which the UCI is transmitted in the resource domain overlap,
Symbols for transmitting the SCFI in the resource region and symbols for transmitting the UCI in the resource region are different from each other.
The method of claim 1, wherein the transceiver receives first information indicating a physical uplink control channel (PUCCH) resource or a physical uplink shared channel (PUSCH) resource for transmitting the SCFI to the base station, and slot timing,
The at least one processor, based on the first information, determines the resource region corresponding to the PUCCH resource or the PUSCH resource in a slot indicated by the slot timing,
The transceiver transmits control information including the SFCI and UCI to the base station through the PUCCH resource or the PUSCH resource in the slot.
The method according to claim 1, wherein the transceiver receives second information indicating a physical uplink control channel (PUCCH) resource or a physical uplink shared channel (PUSCH) resource for transmitting the UCI to the base station, and slot timing,
The at least one processor, based on the second information, determines the resource region corresponding to the PUCCH resource or the PUSCH resource in a slot indicated by the slot timing,
The transceiver transmits control information including the SFCI and UCI to the base station through the PUCCH resource or the PUSCH resource in the slot.
The method according to claim 1, wherein the resource region includes a slot,
The at least one processor identifies a first slot timing for transmitting the SFCI, identifies a second slot timing for transmitting the UCI, and wherein the first slot timing and the second slot timing determine the slot. In response to identifying the indication, the apparatus for transmitting the SFCI and the UCI in the slot.
The apparatus of claim 1, wherein the timing for transmitting the SFCI to the base station is determined based on a processing time required to transmit the SFCI to the base station after the terminal receives the SFCI from the other terminal.
In the device of the terminal in a wireless communication system,
A transceiver for receiving sidelink control information (SCI) including location information for at least one terminal from another terminal,
Acquiring measurement information related to the strength of a signal received from the other terminal, and determining whether to transmit feedback information on the sidelink groupcast data received from the other terminal based on the location information and the measurement information An apparatus comprising at least one processor.
The method of claim 15, wherein the location information includes information on a position of the other terminal, an ID of an area in which the other terminal is located, and information on a position at which the terminal is requested to transmit feedback information on the sidelink groupcast data. , Or includes at least one of the ID of a region where the terminal is requested to transmit feedback information for the sidelink groupcast data,
The measurement information includes: strength of a signal received from the other terminal, information on a channel state of a channel between the other terminal and the terminal, information about a distance between the other terminal and the terminal, or a location of the terminal. A device comprising at least one of information.
The method of claim 16, wherein the at least one processor identifies an ID of an area in which the other terminal is located, determines an ID of an area in which the terminal is located, based on information on the location of the terminal, and the other terminal Based on the determination that the ID of the location where the terminal is located and the ID of the area where the terminal is located match, it is determined to transmit feedback information on the sidelink groupcast data received from the other terminal,
The transceiver is an apparatus for transmitting the feedback information to the other terminal.
The method of claim 16, wherein the at least one processor identifies a coordinate value of an area in which the other terminal is located, and based on information on the location of the terminal, identifies a coordinate value of an area in which the terminal is located, and the other Based on the determination that the difference between the coordinate value of the area where the terminal is located and the coordinate value of the area where the terminal is located is less than a threshold value, it is determined to transmit the feedback information on the sidelink groupcast data received from the other terminal,
The transceiver is an apparatus for transmitting the feedback information to the other terminal.
The apparatus of claim 18, wherein the threshold value is set in the terminal by higher order signaling from a base station or another terminal.
The method of claim 16, wherein the at least one processor identifies an ID of an area in which the other terminal is located, and, based on information about the location of the terminal, determines an ID of an area in which the terminal is located,
The transceiver,
When the ID of the region where the other terminal is located and the ID of the region where the terminal is located match, the feedback information is transmitted to the other terminal through a first physical sidelink feedback channel (PSFCH),
When the ID of the region where the other terminal is located and the ID of the region where the terminal is located do not match, the apparatus for transmitting the feedback information to the other terminal through a second PSFCH.
The method of claim 15, wherein the signal is a physical sidelink control channel (PSCCH), a demodulation reference signal (DMRS) for the PSCCH, a physical sidelink shared channel (PSSCH), a DMRS for the PSSCH, a reference signal for positioning, or a signal for positioning. , An apparatus comprising at least one of a signal for obtaining synchronization in a sidelink, a signal carried from a global positioning system (GPS) or a global navigation satellite system (GNSS).
The method of claim 15, wherein the feedback information is a sidelink scheduling request (SL-SR) for requesting scheduling of a resource for transmission or retransmission in a sidelink, a hybrid automatic repeat request (HARQ-ACK) for sidelink groupcast data. -acknowledgement), sidelink-channel state information (SL-CSI) that is channel state information for a sidelink channel, or at least one of a sidelink-buffer status report (SL-BSR) indicating the amount of data to be transmitted by the terminal Device.
In the method of operating a terminal in a wireless communication system,
A process of receiving sidelink feedback control information (SFCI) from another terminal, and
The process of identifying a resource region for transmitting the SFCI to a base station,
And transmitting control information including the SFCI and uplink control information (UCI) to the base station in the resource region.
In the method of operating a terminal in a wireless communication system,
A process of receiving sidelink control information (SCI) including location information for at least one terminal from another terminal, and
A process of obtaining measurement information related to the strength of a signal received from the other terminal, and the location information
And determining whether to transmit feedback information for sidelink groupcast data received from the other terminal based on the measurement information.

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