Method and device for controlling UE transmission power in wireless communication system

Abstract

A method performed by a terminal in a wireless communication system is provided. The method includes receiving at least one physical sidelink shared channel (PSSCH) from at least one other terminal, determining the number of at least one physical sidelink feedback channel (PSFCH) based on a maximum number of at least one PSFCH for simultaneous transmission in response to the reception of the at least one PSSCH, and transmitting one or more PSFCHs to at least one other terminal based on the number of the at least one PSFCH.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for controlling the transmission power of a terminal in a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for configuring the transmission power of a sidelink synchronization channel and a sidelink feedback channel by a terminal. Background Art

[0002] In order to meet the growing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop an improved fifth generation (5G) communication system or a pre-5G communication system. For this reason, the 5G communication system or the pre-5G communication system is also referred to as a super 4G network communication system or a post-long term evolution (LTE) system. The 5G communication system specified in the third generation partnership project (3GPP) is called a new radio (NR) system. In order to achieve higher data transmission rates, the implementation of the communication system is being considered to be developed in an ultra-high frequency band millimeter wave (mmWave), such as, for example, 60 gigahertz (GHz). In the 5G communication system, beamforming, massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming and massive antenna technology have been discussed as a way to reduce the path loss of radio waves and increase the transmission distance of radio waves in the ultra-high frequency band, and have also been applied to the NR system. For system network improvement, in 5G communication systems, technologies such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMPs), and interference cancellation have been developed. In 5G systems, advanced coding modulation (ACM) schemes including hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) modulation (FQAM) and sliding window superposition coding (SWSC) have been developed, as well as advanced access schemes including filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA).

[0003] The Internet, a human-centric connected network in which humans generate and consume information, is now evolving into the Internet of Things (IoT), in which distributed entities (such as objects) exchange and process information. The Internet of Everything (IoE) has also emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers, etc. In order to realize the IoT, various technical elements are required, such as detection technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, and technologies related to sensor networks for connecting objects, machine-to-machine (M2M), machine-type communication (MTC), etc. have recently been studied. Such an IoT environment can provide intelligent Internet technology (IT) services to create new value in human life by collecting and analyzing data generated between connected objects. Through the integration and combination between existing information technology (IT) and various industries, IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, advanced medical services, etc.

[0004] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communications such as sensor networks, M2M, MTC, etc. have been implemented through schemes such as beamforming, MIMO, array antennas, etc. The application of cloud RAN as a big data processing technology can also be an example of the fusion of 5G technology and IoT technology.

[0005] As described above, with the development of mobile communication systems, various services can be provided, and thus, a method for efficiently providing such services is required.

[0006] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion has been made, as to whether any of the above might be applicable as prior art to the present disclosure. Summary of the invention

[0007] Technical Solutions

[0008] Aspects of the present disclosure at least solve the above problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method and apparatus for effectively controlling the transmission power of a terminal in a wireless communication system.

[0009] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0011] Figure 1A The operation in which all side link terminals are located within the coverage of a base station according to an embodiment of the present disclosure is shown;

[0012] Figure 1B Operations according to an embodiment of the present disclosure are illustrated, wherein among the sidelink terminals, one user equipment (UE) is located within the coverage of a base station and another UE is located outside the coverage of the base station;

[0013] Figure 1C The operation in the case where all side link terminals are outside the coverage of the base station according to an embodiment of the present disclosure is shown;

[0014] Figure 1D An operation of a scenario in which vehicle-to-everything (V2X) communication is performed between terminals located in different cells according to an embodiment of the present disclosure is illustrated;

[0015] Figure 2A The operation of unicast V2X communication according to an embodiment of the present disclosure is shown;

[0016] Figure 2B The operation of multicast V2X communication according to an embodiment of the present disclosure is shown;

[0017] Figure 3 A protocol of a side link terminal according to an embodiment of the present disclosure is shown;

[0018] Figure 4 A sidelink unicast communication process according to an embodiment of the present disclosure is shown;

[0019] Figure 5 A sidelink unicast communication process according to an embodiment of the present disclosure is shown;

[0020] Figure 6 shows the structure of a sidelink synchronization channel according to an embodiment of the present disclosure;

[0021] Figure 7 The structure of a sidelink control channel and a sidelink data channel according to an embodiment of the present disclosure is shown;

[0022] Figure 8 shows the structure of a sidelink feedback channel according to an embodiment of the present disclosure;

[0023] Fig. 9 shows the structure of a side link feedback channel according to another embodiment of the present disclosure;

[0024] Fig.10 The operation of sidelink transmit power control according to an embodiment of the present disclosure is shown;

[0025] Fig.11 The interference caused by a frequency block transmitted by a side link terminal to an adjacent frequency block according to an embodiment of the present disclosure is shown;

[0026] Fig.12 The interference caused by a frequency block transmitted by a side link terminal to an adjacent frequency block according to an embodiment of the present disclosure is shown;

[0027] Fig.13 A method for controlling the transmission power of a sidelink synchronization channel according to an embodiment of the present disclosure is shown;

[0028] Fig.14 The operation of timeline resource allocation of a sidelink feedback channel according to an embodiment of the present disclosure is shown;

[0029] Fig.15 The operation of a method for determining transmission power when a sidelink receiving terminal transmits multiple sidelink feedback channels according to an embodiment of the present disclosure is shown;

[0030] Fig.16 is a block diagram of a structure of a transmitting terminal according to an embodiment of the present disclosure; and

[0031] Fig.17 is a block diagram of a structure of a receiving terminal according to an embodiment of the present disclosure.

[0032] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0033] According to one aspect of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes receiving at least one physical sidelink shared channel (PSSCH) from at least one other terminal, in response to the reception of at least one PSSCH, determining the number of at least one physical sidelink feedback channel (PSFCH) for simultaneous transmission based on the maximum number of at least one PSFCH, and sending one or more PSFCHs to at least one other terminal based on the number of at least one PSFCH.

[0034] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and at least one processor, the at least one processor being configured to receive at least one physical side link shared channel (PSSCH) from at least one other terminal via the transceiver, in response to the reception of at least one PSSCH, determine the number of at least one physical side link feedback channel (PSFCH) for simultaneous transmission based on the maximum number of at least one PSFCH, and based on the number of at least one PSFCH, send one or more PSFCHs to at least one other terminal via the transceiver.

[0035] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0036] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these are to be regarded as exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0037] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it is apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and is not intended to limit the present disclosure as defined by the appended claims and their equivalents.

[0038] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0039] When describing the embodiments of the present disclosure, technical matters that are well known in the technical field of the present disclosure and are not directly related to the present disclosure will not be described. By omitting any unnecessary description, the subject matter of the present disclosure will be described more clearly without being ambiguous.

[0040] For the same reason, some elements in the accompanying drawings will be exaggerated, omitted or simplified. The size of each element does not fully reflect the actual size of the element. In each accompanying drawing, the same or corresponding elements will be referred to as the same reference numerals.

[0041] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0042] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0043] In this disclosure, a controller may also be referred to as a processor.

[0044] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0045] With reference to the embodiments of the present disclosure described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving them will become apparent. However, the present disclosure is not limited to the disclosed embodiments of the present disclosure, but can be implemented in various ways, and the embodiments of the present disclosure are provided to make the disclosure of the present disclosure complete and allow those of ordinary skill in the art to understand the scope of the present disclosure. The present disclosure is defined by the categories of the claims. Throughout the specification, the same reference numerals represent the same elements.

[0046] At the same time, it is known to those skilled in the art that the combination of the blocks of the flowchart and the flowchart can be represented and executed by computer program instructions. These computer program instructions can also be stored in a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the instructions implemented by the processor of the computer or programmable data processing device produce a device for performing the functions specified in one or more boxes of the flowchart and / or block diagram. These computer program instructions can also be stored in a computer-available or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-available or computer-readable memory produce a manufactured product including instructions for implementing the functions specified in one or more boxes of the flowchart and / or block diagram. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operations are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions of the execution computer or other programmable device can provide operations for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0047] In addition, each box represents a module, segment or part of a code, which includes one or more executable instructions for implementing (multiple) specified logical functions. It should also be noted that in other embodiments, (multiple) functions marked in the box may not occur in the order indicated. For example, two boxes shown in succession can actually be executed substantially simultaneously, or these boxes can sometimes be executed in reverse order, depending on the functions involved.

[0048] In the current embodiment of the present disclosure, the term '~ unit' used here means a software or hardware component that performs certain tasks, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the meaning of '~ unit' is not limited to software or hardware. '~ unit' can be advantageously configured to reside on an addressable storage medium and configured to reproduce one or more processors. Therefore, as an example, a unit may include components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided in components and '~ (multiple) units' can be merged into fewer components and '~ (multiple) units', or further divided into additional components and '~ (multiple) units'. In addition, components and '~ (multiple) units' can be implemented to execute one or more computer processing units (CPUs) in a device or a secure multimedia card. In an embodiment of the present disclosure, '~ unit' may include one or more processors.

[0049] Although the embodiments of the present disclosure will be described in detail with respect to a radio access network, a new radio access network (NR), a core network, and a packet core (fifth generation (5G) system, a 5G core network, or a next generation (NG) core) in the 5G mobile communication standard specified by the Third Generation Partnership Project (3GPP) as a mobile communication standardization organization, as determined by a person of ordinary skill in the art, the subject matter of the present disclosure may also be applied to other communication systems with a similar technical background with slight modifications without significantly departing from the scope of the present disclosure.

[0050] In the present disclosure, a sidelink terminal may indicate an NR vehicle-to-everything (V2X) terminal or a long-term evolution (LTE) V2X terminal. In the present disclosure, a sidelink terminal may refer to a terminal supporting device-to-device (D2D) communication. In the present disclosure, a V2X terminal may refer to a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication or a headset of a pedestrian (i.e., a smart phone), a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication. In the present disclosure, a UE may also refer to a roadside unit (RSU) having a UE function, an RSU having a base station function, an RSU having a portion of a UE function and a portion of a base station function.

[0051] In the present disclosure, a sidelink transmitting terminal may refer to a terminal that transmits sidelink data and control information, or a terminal that receives sidelink feedback information. A sidelink receiving terminal may refer to a terminal that receives sidelink data and control information, or a terminal that transmits sidelink feedback information.

[0052] Embodiments of the present disclosure may provide a method and apparatus for controlling the transmission power of a sidelink synchronization channel to improve the coverage of a sidelink system and minimize the interference caused by the sidelink system to a cellular system.

[0053] In addition, embodiments of the present disclosure may provide a method and apparatus for controlling the transmit power of a sidelink feedback channel to improve the reliability of the sidelink system and support a high transmission rate.

[0054] Furthermore, embodiments of the present disclosure may provide an apparatus and method for efficiently providing services in a mobile communication system.

[0055] According to an embodiment of the present disclosure, based on the channel quality between the base station and the side link terminal, the transmission power parameters of the side link synchronization channel and the side link feedback channel can be adjusted. In this way, in a side link system using vehicle communication or D2D communication, the coverage of the side link synchronization signal can be improved. In addition, the reliability and transmission rate of the side link feedback information can be improved. In addition, the amount of interference caused by the side link system to the cellular system can be reduced. Therefore, the embodiments of the present disclosure can support efficient side link communication. In addition, services can be effectively provided in a mobile communication system.

[0056] Figures 1A to 1D is a view illustrating a side link system according to various embodiments of the present disclosure.

[0057] refer to Figure 1A , which shows an example when all side link terminals UE-1 and UE-2 are located within the coverage of the base station.

[0058] All side link terminals UE-1 and UE-2 can receive data and control information from the base station via a downlink (DL), or send data and control information to the base station via an uplink (UL). In this case, the data and control information can be data and control information for side link communication. Alternatively, the data and control information can be data and control information for general cellular communication. The side link terminal can send / receive data and control information for side link communication via a side link (SL).

[0059] refer to Figure 1B , which shows an example in which, in the side link terminal, UE-1 is located within the coverage of the base station, and UE-2 is located outside the coverage of the base station. Figure 1B The example of can be considered as an example about partial coverage.

[0060] UE-1 located within the coverage of the base station can receive data and control information from the base station through DL, or send data and control information to the base station through UL.

[0061] UE-2 located out of the coverage of the base station may not be able to receive data and control information from the base station through DL, and may not be able to send data and control information to the base station through UL.

[0062] UE-2 may transmit and receive data and control information for sidelink communication to and from UE-1 through the SL.

[0063] refer to Figure 1C , which illustrates an example of a situation where all sidelink terminals are located outside the coverage of the base station.

[0064] Therefore, UE-1 and UE-2 may not be able to receive data and control information from the base station through DL, and may not be able to transmit data and control information to the base station through UL.

[0065] UE-1 and UE-2 can send and receive data and control information for sidelink communication through SL.

[0066] refer to Figure 1D , which shows an example of a scenario in which sidelink communication (or V2X communication) is performed between terminals located in different cells. More specifically, Figure 1D A situation is shown in which the SL transmitting terminal and the SL receiving terminal are connected to different base stations (radio resource control (RRC) connected state) or reside in different base stations (RRC disconnected state, i.e., RRC idle state). In this case, UE-1 can be a sidelink transmitting terminal and UE-2 can be a sidelink receiving terminal. Alternatively, UE-1 can be a sidelink receiving terminal and UE-2 can be a sidelink transmitting terminal. UE-1 can receive a SL dedicated system information block (SIB) from a base station to which UE-1 is connected (or where UE-1 resides), and UE-2 can receive a sidelink dedicated SIB from another base station to which UE-2 is connected (or where UE-2 resides). In this case, the information of the sidelink dedicated SIB received by UE-1 and the information of the sidelink dedicated SIB received by UE-2 can be different from each other. Therefore, in order to perform sidelink communication between terminals located in different cells, the information needs to be standardized.

[0067] Although for the sake of convenience, Figures 1A to 1D A side link system including two terminals UE-1 and UE-2 is shown, but the present disclosure is not limited thereto. The UL and DL between the base station and the side link terminal may be referred to as Uu interfaces, and the side link between the side link terminals may be referred to as PC5 interfaces. Therefore, in the present disclosure, the UL and DL and Uu interfaces between the base station and the side link terminal may be used interchangeably. Moreover, the side link between the side link terminal and the PC5 interface may be used interchangeably.

[0068] In the present disclosure, a terminal may refer to a terminal supporting D2D communication, a vehicle supporting V2V communication, a vehicle or a pedestrian's mobile phone (i.e., a smart phone) supporting V2P communication, or a vehicle supporting V2N communication, or a vehicle supporting V2I communication. In the present disclosure, a terminal may also refer to an RSU with a terminal function, an RSU with a base station function, or an RSU with partial terminal functions and partial base station functions.

[0069] In addition, in the present disclosure, a base station may be a base station that supports sidelink communication and general cellular communication, or a base station that supports sidelink communication. In this case, the base station may refer to a 5G base station (gNB), a 4G base station (evolved Node B (eNB)), or an RSU. Therefore, unless otherwise mentioned in the present disclosure, a base station and an RSU may be used as the same concept and therefore may be used interchangeably.

[0070] Figure 2A and Figure 2B is a view illustrating a method of side link communication performed through a side link according to various embodiments of the present disclosure.

[0071] refer to Figure 2A , the transmitting (TX) terminal and the receiving (RX) terminal can perform one-to-one communication, which can be referred to as unicast communication (or unicast V2X communication or unicast SL communication). For example, when UE-1 is a TX terminal, UE-2 can be an RX terminal. Alternatively, when UE-2 is a TX terminal, UE-1 can be an RX terminal.

[0072] refer to Figure 2B , the TX terminal and the RX terminal can perform one-to-many communication, which can be called groupcast or multicast communication (or groupcast V2X communication or multicast SL communication).

[0073] exist Figure 2B UE-1, UE-2, and UE-3 form a group (group A) to perform groupcast communication, and UE-4, UE-5, UE-6, and UE-7 form another group (group B) to perform groupcast communication. Each terminal can perform groupcast communication in the group to which the terminal belongs, and can perform communication between different groups through unicast, multicast, or broadcast communication. Figure 2B It is shown that two groups are formed, but the present disclosure is not limited thereto.

[0074] At the same time, although Figure 2A and Figure 2B Although not shown in the figure, the sidelink terminal may perform broadcast communication. Broadcast communication may refer to all sidelink terminals receiving data and control information transmitted by the sidelink transmitting terminal through the sidelink. For example, when UE-1 is assumed to be Figure 2BWhen UE-1 is a transmitting terminal for broadcast communication, all terminals UE-2, UE-3, UE-4, UE-5, UE-6 and UE-7 can receive data and control information sent by UE-1.

[0075] Figure 3 is a diagram illustrating a protocol of a side link terminal according to an embodiment of the present disclosure.

[0076] although Figure 3 , but the application layer of terminal-A UE-A and terminal-B UE-B may perform service discovery. In this case, service discovery may include discovery of which sidelink communication scheme (unicast, groupcast, or broadcast communication) each terminal will perform. Figure 3 It can be assumed that terminal-A UE-A and terminal-B UE-B recognize that unicast communication is to be performed through service discovery performed in the application layer. The side link terminal can obtain information about the source identifier (ID) and destination ID for side link communication in the aforementioned service discovery.

[0077] Once service discovery is complete, Figure 3 The PC5 signaling protocol layer shown may perform a terminal-to-terminal direct link connection establishment process. In this case, the PC5 signaling protocol layer may exchange security configuration information for terminal-to-terminal direct communication.

[0078] When the end-to-end direct link connection is established, you can Figure 3 The terminal-to-terminal PC5 RRC establishment process is performed in the PC5 RRC layer shown. At this time, information about the capabilities of terminal-A UE-A and information about the capabilities of terminal-B UE-B can be exchanged, and access layer (AS) layer parameter information for unicast communication can be exchanged. In this case, the information about terminal capabilities negotiated between terminals through PC5 RRC can be a subset of the information used in the capability negotiation between the base station and the terminal. For example, it can be assumed that the side link terminal reports information A, B, C and D about its capabilities to the base station. In this case, the side link terminal can negotiate a part of the information through PC5 RRC.

[0079] Once the PC5 RRC establishment procedure is completed, the terminal-A UE-A and the terminal-B UE-B can perform unicast communication.

[0080] Although the foregoing description has been made using unicast communication as an example, this can be extended to multicast communication. For example, when terminal-A UE-A, terminal-B UE-B, and Figure 3When the terminal-C UE-C not shown in the figure performs multicast communication, as described above, the terminal-A UE-A and the terminal-B UE-B can perform service discovery, terminal-to-terminal direct link establishment and PC5 RRC establishment for unicast communication. The terminal-A UE-A and the terminal-C UE-C can also perform service discovery, terminal-to-terminal direct link establishment and PC5 RRC establishment for unicast communication. The terminal-B UE-B and the terminal-C UE-C can also perform service discovery, terminal-to-terminal direct link establishment and PC5 RRC establishment for unicast communication. For example, a PC5RRC establishment process for unicast communication can be performed in each pair of a transmitting terminal and a receiving terminal that join the multicast communication, instead of a separate PC5 RRC establishment process for multicast communication.

[0081] Figure 4 is a diagram illustrating a sidelink unicast communication process according to an embodiment of the present disclosure.

[0082] More specifically, Figure 4 2 is a diagram for describing a side link communication process based on the mode 1 resource allocation described with reference to FIG. 2 .

[0083] refer to Figure 4 , a base station (e.g., eNB / gNB / RSU) can configure a transmitting terminal (TX-UE) and a receiving terminal (RX-UE) in a cell with parameters for sidelink communication through system information. For example, a base station (gNB) can configure information about a resource pool, with which sidelink communication can be performed in the cell of the base station. In this case, the resource pool may indicate a transmitting resource pool for sidelink transmission or a receiving resource pool for sidelink reception. The base station can configure the sidelink terminal with information about one or more resource pools. The base station can configure unicast communication, multicast communication, and broadcast communication to be performed in different resource pools through system information. For example, resource pool 1 can be used in unicast communication, resource pool 2 can be used in multicast communication, and resource pool 3 can be used in broadcast communication. In another example, the base station can configure unicast communication, multicast communication, and broadcast communication to be performed in the same resource pool. In another example, the base station can configure different resource pools based on whether resources of a physical sidelink feedback channel (PSFCH) for sending SL feedback information exist in the resource pool. More specifically, the PSFCH resource may exist in resource pool 1 and may not exist in resource pool 2. In this case, SL unicast and multicast data requiring hybrid automatic repeat and request (HARQ) feedback may use resource pool 1, while SL unicast and multicast data and broadcast data not requiring HARQ feedback may use resource pool 2.

[0084] The resource pool information configured by the base station may include at least one of the following information:

[0085] 1. Information about time domain resources of a resource pool: The information may include the index of the time slot in which the physical sidelink control channel (PSCCH), the physical sidelink shared channel (PSSCH), and the physical sidelink feedback channel (PSFCH) are to be transmitted, or the index of the time slot in which the PSCCH, PSSCH, and PSFCH are to be transmitted and the index of the corresponding symbol in the time slot. The information may also include the time period in which the resources of the PSCCH, PSSCH, and PSFCH are transmitted.

[0086] 2. Information about frequency domain resources of the resource pool: This information may mean information about the frequency axis in the resource pool, in which PSCCH, PSSCH and PSFCH can be sent, and more specifically, may include indexes of resource blocks constituting the resource pool or indexes of subchannels including two or more resource blocks.

[0087] 3. Information on whether to use SL HARQ-Acknowledgement (ACK) may be included in the resource pool configuration information.

[0088] (1) When SL HARQ-ACK is used, at least one of the following information may be included:

[0089] (1-1) Maximum retransmission count

[0090] (1-2) HARQ-ACK timing: This may mean the time from when the SL receiving terminal receives SL control information and data information from the SL transmitting terminal to when the SL receiving terminal sends HARQ-ACK / negative ACK (NACK) information about the sidelink control information and data information to the SL transmitting terminal. In this case, the time unit may be a time slot or one or more orthogonal frequency division multiplexing (OFDM) symbols.

[0091] (1-3) PSFCH format or HARQ feedback method: When two or more PSFCH formats are used, one PSFCH format can be used to send HARQ-ACK / NACK information consisting of one bit or two bits. Another PSFCH format can be used to send HARQ-ACK / NACK information consisting of 3 or more bits. At the same time, when HARQ-ACK / NACK information is sent through PSFCH, ACK information and NACK information can be sent through PSFCH respectively. In this case, when the SL receiving terminal successfully decodes the PSSCH sent from the SL transmitting terminal, the SL receiving terminal can send ACK through PSFCH. When the SL receiving terminal fails to decode, the SL receiving terminal can send NACK through PSFCH. In another example, when the PSSCH sent from the SL transmitting terminal is successfully decoded, the SL receiving terminal may not send ACK, and only when the decoding fails, NACK can be sent through PSFCH. On the other hand, when one PSFCH format is used, information on the above-mentioned HARQ feedback method (whether ACK information and NACK information will be transmitted through PSFCH respectively, or NACK information will be transmitted through PSFCH) may be included.

[0092] (1-4) Time / frequency / code resources or resource sets constituting PSFCH: Time resources may include the time slot or symbol and the index of the period in which PSFCH is transmitted. Frequency resources may include the frequency block (resource block (RB)) in which PSFCH is transmitted, or the start and end points of a subchannel including two or more consecutive blocks (or the start and length of frequency resources).

[0093] 4. Information on whether to use blind retransmission may be included in the resource pool configuration information.

[0094] Blind retransmission may mean that, unlike in HARQ-ACK / NACK-based retransmission, the transmitting terminal repeatedly performs transmission without receiving feedback information about ACK or NACK from the receiving terminal. When blind retransmission is used, the blind retransmission count may be included in the resource pool information. For example, when the blind retransmission count is configured to 4, when the transmitting terminal sends PSCCH / PSSCH to the receiving terminal, the transmitting terminal may always send the same information four times. In this case, the redundancy version (RV) value may be included in the SL control information (SCI) sent via the PSCCH.

[0095] 5. Information about the demodulation reference signal (DMRS) pattern available in the PSSCH transmitted in the corresponding resource pool

[0096] The DMRS modes available in PSSCH may vary with the speed of the terminal. For example, for high-speed terminals, in order to improve the accuracy of channel estimation, it is necessary to increase the number of OFDM symbols used in DMRS transmission in the time domain. For low-speed terminals, since the accuracy of channel estimation can be guaranteed even with a small number of DMRS symbols, it is necessary to reduce the number of OFDM symbols used in DMRS transmission on the time axis to reduce DMRS overhead. Therefore, the information about the resource pool may include information about the DMRS modes available in the resource pool. In this case, two or more DMRS modes may be configured in one resource pool, and the side link transmitting terminal may select and use a DMRS mode from the configured DMRS modes based on the speed of the side link transmitting terminal. The SL transmitting terminal may also send information about the DMRS mode selected by the SL transmitting terminal to the SL receiving terminal via the SCI of the PSCCH. The SL receiving terminal may obtain DMRS mode information by receiving information, perform channel estimation on the PSSCH, and obtain SL data information by performing demodulation and decoding.

[0097] 6. Whether to use SL channel state information reference signal (CSI-RS)

[0098] (1) When SL CSI-RS is used, at least one of the following information may be included:

[0099] (1-1) CSI-RS transmission starting point: This may indicate the starting point at which the SL transmitting terminal must send the CSI-RS to the SL receiving terminal. The starting point may refer to the index of the time slot in which the CSI-RS will be sent, the index of the symbol in which the CSI-RS will be sent, or both the index of the time slot and the index of the symbol.

[0100] (1-2) CSI report timing: This may mean the time from the time point when the SL receiving terminal receives the CSI-RS from the SL transmitting terminal (i.e., the index of the time slot in which the SL receiving terminal receives the CSI-RS from the SL transmitting terminal or the index of the symbol in the time slot) to the time point when the SL receiving terminal sends the CSI report to the SL transmitting terminal (i.e., the index of the time slot in which the SL receiving terminal sends the CSI report to the SL transmitting terminal). In this case, the unit representing time may be a time slot or one or more OFDM symbols.

[0101] 7. Parameters for SL transmit power control

[0102] (1) For SL transmit power control, an SL path loss estimation value may be required. In addition, when the Uu carrier and the SL carrier of the base station are the same as each other, the SL transmit power control can operate based on the DL path loss estimation value to reduce the interference caused by the side link transmission to the UL signal received by the base station receiving end. To this end, the base station can configure whether the SL transmitting terminal needs to configure the SL transmit power based on the SL path loss estimation value, whether the side link transmitting terminal needs to configure the SL transmit power based on the DL path loss estimation value, or whether the SL transmitting terminal needs to configure the SL transmit power based on the SL path loss estimation value and the DL path loss estimation value. For example, when the base station configures the synchronization signal block SSB or DL ​​CSI-RS as a signal that must be used for path loss estimation, the terminal can configure the SL transmit power based on the DL path loss estimation value. When the base station configures the SL DMRS or SL CSI-RS as a signal that must be used for path loss estimation, the terminal can configure the SL transmit power based on the SL path loss estimation value.

[0103] (2) As described above, the terminal may be configured with different transmission power parameters according to the signal used for path loss estimation.

[0104] Although the foregoing description has been made using an example in which the foregoing information is included in a resource pool configuration for SL communication, the present disclosure is not limited to the foregoing description. For example, the foregoing information may be configured for a SL transmitting terminal or a SL receiving terminal independently of a resource pool configuration.

[0105] refer to Figure 4 , when data (or V2X data or SL data) to be transmitted from the SL transmitting terminal to the SL receiving terminal is generated, the SL transmitting terminal may request the base station for SL resources to be transmitted to the SL receiving terminal by using a scheduling request (SR) or / and a buffer status report (BSR). The base station having received the BSR may recognize that the SL transmitting terminal has data for SL transmission, and determine resources required for SL transmission based on the BSR.

[0106] According to an embodiment of the present disclosure, a base station may send a SL scheduling grant including at least one of resource information for SCI transmission, resource information for SL data transmission, or resource information for SL feedback transmission to a SL transmitting terminal. The SL scheduling grant, which is information for permitting dynamic scheduling in SL, may be downlink control information (DCI) transmitted on a physical downlink control channel (PDCCH). The SL scheduling grant may include information indicating a bandwidth part (BWP) in which SL transmission is performed and a carrier indicator field (CIF) or a carrier frequency indicator in which SL transmission is performed for an NR base station, and may include a CIF for an LTE base station. The SL scheduling grant may also include resource allocation information for a PSFCH, in which feedback information about SL data, i.e., ACK / NACK information, is transmitted. When the SL transmission corresponds to a multicast transmission, the resource allocation information may include information for allocating multiple PSFCHs to multiple terminals in the group. The resource allocation information for the feedback information may be information indicating at least one of multiple feedback information resource candidate sets configured by higher layer signaling.

[0107] According to an embodiment of the present disclosure, a SL transmitting terminal that has received a SL scheduling grant may, in response to the sidelink scheduling grant, send an SCI for scheduling SL data to a SL receiving terminal on a PSCCH, and send SL data on a PSSCH. The SCI may include resource allocation information used in SL data transmission, modulation and coding scheme (MCS) information applied to SL data, group destination ID information, source ID information, unicast destination ID information, power control information for controlling SL power, timing advance (TA) information, DMRS configuration information for SL transmission (e.g., information about the number of repeated packet transmissions), resource allocation information corresponding to repeated packet transmissions, and at least one of a redundancy version (RV) or a HARQ process ID. The SCI may also include information indicating a resource in which feedback information (i.e., ACK / NACK information) about SL data is sent.

[0108] According to an embodiment of the present disclosure, a receiving terminal that has received SCI can receive SL data. Thereafter, the SL receiving terminal can send ACK / NACK information indicating the success or failure of SL data decoding to the SL sending terminal on PSFCH. The transmission of SL feedback information can be applied to unicast transmission or multicast transmission, without excluding broadcast transmission. When SL transmission corresponds to multicast transmission, each terminal that has received multicast data can send feedback information by using different PSFCH resources. Alternatively, each terminal that has received multicast data can send feedback information by using the same PSFCH resource, and in this case, NACK information can be fed back. For example, a terminal that has received data may not perform a feedback operation on ACK. In this case, PSFCH resources may include not only resources identified in the time domain or / and frequency domain, but also resources identified using codes such as scrambling codes, orthogonal cover codes, and resources identified using different sequences and cyclic shifts applied to different sequences.

[0109] According to an embodiment of the present disclosure, the base station can configure the SL transmitting terminal to report the HARQ feedback received from the SL receiving terminal by using system information or RRC. In this case, the SL transmitting terminal can send the SL HARQ feedback received from the SL receiving terminal to the base station via PUCCH or PUSCH. The base station can configure whether the SL transmitting terminal can multiplex and send the SL HARQ feedback information received from the SL receiving terminal and the UCI for the existing Uu.

[0110] According to an embodiment of the present disclosure, when the base station does not configure the SL transmitting terminal to multiplex the SL HARQ feedback information and the UCI, the SL transmitting terminal cannot multiplex the SL HARQ feedback information and the UCI for Uu and send them through one PUCCH. In this case, the base station can independently configure the PUCCH for sending the SL HARQ feedback information and the PUCCH for sending the UCI. For example, the PUCCH for sending the SL HARQ feedback information can exist independently, and any UCI may not be sent in the PUCCH.

[0111] On the other hand, when the base station is configured to multiplex SL HARQ feedback information and UCI, the SL transmitting terminal can multiplex SL HARQ feedback information and UCI and send them through one PUCCH. Assuming that the SL HARQ feedback information is N1 bits and the UCI is N2 bits, the order of multiplexing can follow N2+N1 (i.e., the SL HARQ feedback information is multiplexed after the UCI). When the code rate of the sum of the SL HARQ feedback bits and the UCI bits sent via PUCCH by multiplexing is greater than the code rate configured by the base station, the SL transmitting terminal can give up sending the SL HARQ feedback information (i.e., discard the SL HARQ feedback information).

[0112] Figure 4 Assume a scenario in which the SL transmitting terminal is in a state of UL connection to the base station (ie, RRC connection state), and both the SL transmitting terminal and the SL receiving terminal exist within the coverage of the base station. Figure 4 Although not shown in the figure, when the SL transmitting terminal is not configured with a UL connection to the base station (ie, RRC idle state), the SL transmitting terminal can perform a random access procedure for establishing a UL connection with the base station. Figure 4 Although not shown in the figure, in the case where the SL transmitting terminal exists within the coverage of the base station and the SL receiving terminal exists outside the coverage of the base station, the SL receiving terminal may be pre-configured with information for SL communication and then use the pre-configured information. Figure 4 As shown, the SL transmitting terminal can be configured with information for SL communication by the base station. In an embodiment of the present disclosure, when both the SL transmitting terminal and the SL receiving terminal exist outside the coverage of the base station, the SL transmitting terminal and the SL receiving terminal can be pre-configured with information for SL communication and then use the pre-configured information. In this case, when the terminal or the base station is pre-configured, this may refer to the terminal or the base station using a value embedded in the terminal when the terminal is released. In another example, in a case where the SL transmitting terminal or the SL receiving terminal has obtained information for SL communication through an RRC establishment connected to a base station or has obtained information for SL communication through system information of the base station, pre-configuration may include using the most recently obtained information.

[0113] although Figure 4 It is not shown in the figure, but it can be assumed that before the SL sending terminal sends the SR / BSR to the base station, the SL sending terminal has already passed the reference Figure 3 The mentioned process completes the service discovery, the terminal-to-terminal direct link connection establishment process and the PC5 RRC establishment process with the SL receiving terminal.

[0114] Figure 5 The side link unicast communication process according to an embodiment of the present disclosure is shown.

[0115] More specifically, Figure 5 The SL communication process based on mode 2 resource allocation described with reference to FIG2 is shown. Figure 5 In the present invention, the base station (gNB) can configure the SL transmitting and receiving terminals (TX-UE and RX-UE) in the cell with parameters for SL communication through system information. The parameters may include reference Figure 4 At least one of the parameter information described.

[0116] refer to Figure 5 , when data (or V2X data or SL data) to be sent to the SL receiving terminal is generated in the SL transmitting terminal, the SL transmitting terminal may send SCI to the SL receiving terminal on the PSCCH, and send the SL data to the SL receiving terminal on the PSSCH. In an embodiment of the present disclosure, the SCI may include resource allocation information used in SL data transmission, MCS information applied to SL data, group destination ID information, source ID information, unicast destination ID information, power control information for controlling SL power, TA information, DMRS configuration information for SL transmission, information about repeated packet transmission (e.g., the number of repeated packet transmissions), resource allocation information corresponding to repeated packet transmission, and at least one of RV or HARQ process ID. The SCI may also include information indicating the resources in which feedback information (ACK / NACK information) about SL data is sent.

[0117] According to an embodiment of the present disclosure, a SL receiving terminal that has received an SCI can receive SL data. Thereafter, the SL receiving terminal can send ACK / NACK information indicating the success or failure of SL data decoding to the SL sending terminal on the PSFCH. The transmission of feedback information for SL can be applied to unicast transmission or multicast transmission, without excluding broadcast transmission. When the SL transmission corresponds to a multicast transmission, each terminal that has received the multicast data can send feedback information by using different PSFCH resources. Alternatively, each terminal that has received the multicast data can send feedback information by using the same PSFCH resource, and in this case, only NACK information can be fed back (that is, when the terminal that has received the data determines the ACK information, the feedback operation is not performed). In this case, the PSFCH resources can include not only resources identified in the time domain or / and frequency domain, but also resources identified using codes such as scrambling codes, orthogonal cover codes, and resources identified using different sequences (and cyclic shifts applied to different sequences).

[0118] refer to Figure 4 ,exist Figure 5In the present invention, the base station can configure the SL transmitting terminal to report the HARQ feedback received from the SL receiving terminal by using system information or RRC. In this case, the SL transmitting terminal can send the SL HARQ feedback received from the SL receiving terminal to the base station through PUCCH or PUSCH. The base station can configure whether the SL transmitting terminal can multiplex and send the SL HARQ feedback information received from the SL receiving terminal and the UCI for the existing Uu.

[0119] When the base station does not configure the SL transmitting terminal to multiplex the SL HARQ feedback information and UCI, the SL transmitting terminal cannot multiplex the SL HARQ feedback information and UCI for Uu, and cannot send them through one PUCCH. In this case, the base station can independently configure the PUCCH for sending the SL HARQ feedback information and the PUCCH for sending the UCI. For example, the PUCCH for sending the SL HARQ feedback information can exist independently, and any UCI may not be sent through the PUCCH.

[0120] On the other hand, when the base station is configured to multiplex SL HARQ feedback information and UCI, the SL transmitting terminal can multiplex SL HARQ feedback information and UCI and send them through one PUCCH. Assuming that the SL HARQ feedback information is N1 bits and the UCI is N2 bits, the order of multiplexing can follow N2+N1 (i.e., the SL HARQ feedback information is multiplexed after the UCI). When the coding rate of the sum of the SL HARQ feedback bits and the UCI bits sent through PUCCH multiplexing is greater than the coding rate configured by the base station, the SL transmitting terminal can give up sending the SL HARQ feedback information (i.e., discard the SL HARQ feedback information).

[0121] Figure 5 is a diagram of a scenario assuming that all SL transmitting and receiving terminals exist within the coverage of a base station according to an embodiment of the present disclosure. Figure 5 Not shown, but Figure 5 It can also be applied to the case where all SL sending and receiving terminals are outside the coverage of the base station. In this case, the SL sending and receiving terminals can be pre-configured with the above information for SL communication. Figure 5 Not shown, but Figure 5 The scenario of may also be applied to a scenario in which one of the SL transmitting and receiving terminals exists within the coverage of the base station and the other terminal exists outside the coverage of the base station. In this case, the terminal existing within the coverage of the base station may be pre-configured with information for SL communication by the base station, and the terminal existing outside the coverage of the base station may be pre-configured with information for SL communication. In this case, 'information for SL communication' may be interpreted as the above reference Figure 4 Information describing at least one parameter of SL communication. When the terminal is preconfigured, this may refer to the terminal using a value embedded in the terminal when the terminal is released. In another example, where the SL sending terminal or the receiving terminal has obtained information for SL communication through RRC establishment connected to the base station or has obtained information for SL communication through system information of the base station, preconfiguration may include using the most recently obtained information.

[0122] although Figure 5 It is not shown in the figure, but it can be assumed that before the SL transmitting terminal sends PSCCH / PSSCH to the SL receiving terminal, the SL transmitting terminal has already passed the reference Figure 3 The mentioned process completes the service discovery, direct link connection establishment process with the SL receiving terminal and PC5 RRC establishment process.

[0123] Although the example reference has been made by using a unicast communication in which one SL receiving terminal exists Figure 5 Description is made, but the description can be equally applied to multicast communication and broadcast communication in which there are two or more SL receiving terminals.

[0124] Figure 6 is a diagram showing the structure of a sidelink synchronization channel according to an embodiment of the present disclosure.

[0125] refer to Figure 6 , the sidelink synchronization channel can be expressed as a sidelink synchronization signal block (S-SSB), and one S-SSB can include 14 symbols. One S-SSB can include a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), a physical sidelink broadcast channel (PSBCH), and a guard period (GAP). In this case, each of the S-PSS and the S-SSS can include two OFDM symbols, the PSBCH can include nine OFDM symbols, and the GAP can include one OFDM symbol.

[0126] In this case, reference Figure 6 , S-PSS can be mapped to OFDM symbol indexes 1 and 2, S-SSS can be mapped to OFDM symbol indexes 3 and 4, and GAP can be mapped to the last OFDM symbol of S-SSB (i.e., OFDM symbol index 13). PSBCH can be mapped to other OFDM symbols except S-PSS, S-SSS, and GAP. Although in Figure 6It is shown that the S-PSS and S-SSS are located in consecutive symbols, but the S-PSS and S-SSS can be separated from each other by one symbol. For example, the S-PSS can be mapped to OFDM symbol indices 1 and 2, the S-SSS can be mapped to OFDM symbol indices 4 and 5, and the PSBCH can be mapped to OFDM symbol indices 0, 3, 6, 7, 8, 9, 10, 11, 12, and 13. Although Figure 6 is not shown, the DMRS can be sent in each of the OFDM symbols to which the PSBCH is mapped.

[0127] Figure 7 The structure of the sidelink control channel and the sidelink data channel according to an embodiment of the present disclosure is shown.

[0128] Referring to Figure 7 , the PSCCH may include K1 symbols and N1 RBs. In the PSSCH, the K1 symbols may include N2 RBs, and the other K2 symbols may include M RBs. Meanwhile, Figure 7 it is shown that the PSFCH includes K3 symbols and M RBs, and the number of RBs of the PSSCH is equal to the number of RBs of the PSFCH. However, the resource size on the frequency axis of the PSFCH may be smaller than the number of RBs of the PSSCH. For example, the PSSCH may include ten RBs, and the PSFCH may include one RB.

[0129] Referring to Figure 7 , K1 and K2 may be equal to or different from each other. When K1 and K2 are different from each other, K1 > K2 or K1 < K2. In an embodiment of the present disclosure, K1 + K2 + guard symbol 1 + K3 + guard symbol 2 < K, and guard symbol 1 and guard symbol 2 may include one OFDM symbol or two or more OFDM symbols. In this case, guard symbol 1 and guard symbol 2 may include OFDM symbols with different lengths. For example, guard symbol 1 may include two OFDM symbols, and guard symbol 2 may include one OFDM symbol.

[0130] According to an embodiment of the present disclosure, the sidelink transmitting terminal may transmit the SCI through the PSCCH including K1 symbols on the time axis and N2 frequency blocks on the frequency axis, as Figure 7 shown. The SCI including the time / frequency allocation information of the PSSCH may be transmitted, and the PSSCH includes (K1 + K2) symbols on the time axis and M frequency blocks on the frequency axis. The SL receiving terminal may receive and decode the PSCCH transmitted from the transmitting terminal, then obtain the time / frequency allocation information of the PSSCH and decode the PSSCH. Figure 7, it is shown that the PSSCH including K2 symbols is physically located continuously after the K1 symbols of the PSCCH, but may be physically discontinuous (ie, may be logically located continuously and may be physically discontinuous).

[0131] According to an embodiment of the present disclosure, Figure 7 In the embodiment of the present invention, the SL transmitting terminal may use the protection symbol 1GAP-1 to transmit PSCCH and PSSCH to one or more SL receiving terminals, and receive PSFCH from one or more SL receiving terminals. For example, the protection symbol 1GAP-1 may be a period required for switching between PSCCH / PSSCH transmission and PSFCH reception according to the SL transmitting terminal, and a period required for switching between PSCCH / PSSCH reception and PSFCH transmission according to the SL receiving terminal.

[0132] At the same time, Figure 7 The SL time slot structure shown is different, and a time slot in which PSFCH does not exist can be considered. In this case, the SL time slot can include K1 frequency-division multiplexed PSCCH / PSSCH symbols, K2 PSSCH symbols, and a protection symbol GAP-2 located at the end of the time slot. For example, among the K symbols of the SL time slot, other symbols except the K1 frequency-division multiplexed PSCCH / PSSCH symbols (i.e., K-(K1+1) symbols, and in this case, the number of symbols of the protection symbol GAP-2 is assumed to be 1) can be used by the SL transmitting terminal for PSSCH transmission.

[0133] At the same time, Figure 7 , the PSCCH is shown to be located in the middle of the SL slot on the frequency axis, but the present disclosure is not limited thereto. For example, the PSCCH may include N1 RBs based on the lowest RB index or the highest RB index.

[0134] Figure 8 The structure of a sidelink feedback channel according to an embodiment of the present disclosure is shown.

[0135] Figure 8 The structure of a sidelink feedback channel (PSFCH) that can be sent by a (SL) receiving terminal is shown, where the PSFCH can be used to send Figure 4 and 5 SL HARQ feedback information described in.

[0136] refer to Figure 8, the DMRS overhead is assumed to be, but not limited to, 1 / 3 (i.e., four resource elements (REs) out of twelve resource elements (REs) are used for DMRS). For example, when the DMRS overhead is 1 / 4 (i.e., three REs out of twelve REs are used for DMRS), DMRS may be mapped to RE indexes 1, 5, and 9 (or 2, 6, and 10), and HARQ feedback information may be mapped to other RE indexes.

[0137] Although in Figure 8 , but the structure can also be equally applied to a PSFCH including two or more RBs. For example, when it is assumed that two RBs correspond to the size of the PSFCH frequency resource transmitted by one SL receiving terminal, DMRS can be mapped to RE indexes 1, 4, 7, 10, 13, 16, 19 and 22, and HARQ feedback information can be mapped to other RE indexes.

[0138] When a PSFCH transmitted by an SL receiving terminal includes two or more OFDM symbols on the time axis, the PSFCH including one OFDM symbol may be repeated. For example, when two OFDM symbols are included in the PSFCH or three OFDM symbols are included in the PSFCH, the PSFCH including one OFDM symbol may be repeated as follows: Figure 8 Repeat as shown. Figure 8 Not shown in FIG, but the principle can also be extended to the structure of a PSFCH comprising four or more OFDM symbols.

[0139] Figure 8 The PSFCH shown can be mapped to Figure 7 K3 symbols in the SL time slot resource shown. Figure 8 Not shown in FIG, but HARQ feedback information may be mapped to all REs of PSFCH, with no REs used for DMRS transmission.

[0140] In addition, despite the Figure 8 , it is shown that even when the number of OFDM symbols increases, DMRS exists in the same RE on the frequency axis, but the present disclosure is not limited to this. For example, for a PSFCH including two OFDM symbols, the DMRS RE position in the second OFDM symbol may be different from the DMRS RE position in the first OFDM symbol. Similarly, for a PSFCH including three OFDM symbols, the DMRS RE position in each OFDM symbol may be different. In another example, for a PSFCH including three or more OFDM symbols, the DMRS RE positions in at least two OFDM symbols may be the same as each other.

[0141] Fig. 9 The structure of the SL feedback channel according to another embodiment of the present disclosure is shown.

[0142] Fig. 9 shows the structure of a PSFCH that can be sent by a (SL) receiving terminal, where the PSFCH can be used to send Figure 4 and Figure 5 SL HARQ feedback information described in.

[0143] refer to Fig. 9 , the DMRS overhead is assumed to be, but not limited to, 1 / 3 (i.e., four REs out of twelve REs are used for DMRS). For example, when the DMRS overhead is 1 / 4 (i.e., three REs out of twelve REs may be used for DMRS), DMRS may be mapped to RE indexes 1, 5, and 9 (or 2, 6, and 10), and SL HARQ feedback information may be mapped to other RE indexes.

[0144] Although similar to Figure 8 ,exist Fig. 9 , but the structure can also be equally applied to a PSFCH including two or more RBs. For example, when it is assumed that two RBs correspond to the size of a PSFCH frequency resource transmitted by a SL receiving terminal, DMRS can be mapped to RE indexes 1, 4, 7, 10, 13, 16, 19 and 22, and SL HARQ feedback information can be mapped to other RE indexes.

[0145] When a PSFCH sent by a SL receiving terminal is Figure 8 When the time axis in includes two or more OFDM symbols, the PSFCH including one OFDM symbol is repeated. Fig. 9 In the example shown, the DMRS may exist in odd-numbered OFDM symbols, and the DMRS may not exist in even-numbered OFDM symbols (ie, the DMRS may exist in the first and third OFDM symbols, and the DMRS may not exist in the second OFDM symbol).

[0146] Fig. 9 The PSFCH shown can be mapped to Figure 7 K3 symbols in the SL time slot resource shown. Fig. 9 Not shown in FIG. 4 , SL HARQ feedback information may be mapped to all REs of PSFCH while no REs (ie, DMRS) are used for DMRS transmission.

[0147] In addition, despite the Fig. 9It is shown in FIG. 1 that even when the number of OFDM symbols increases, DMRS exists in the same RE on the frequency axis, but the present disclosure is not limited to this. For example, for a PSFCH including three OFDM symbols, the DMRS RE position in the third OFDM symbol may be different from the DMRS RE position in the first OFDM symbol. Similarly, for a PSFCH including four or more OFDM symbols, the DMRS RE position in each OFDM symbol where DMRS exists may be different. In another example, for a PSFCH including four or more OFDM symbols, the DMRS RE position in each OFDM symbol where DMRS exists may be different.

[0148] Fig.10 The operation of SL transmission power control according to an embodiment of the present disclosure is shown.

[0149] refer to Fig.10 , it can be assumed that the terminal UE1 is located near the base station gNB, and the terminal UE2 is located far away from the base station gNB (that is, the terminal UE1 can be located at the center of the cell, and the terminal UE2 can be located at the edge of the cell). The terminals UE1 and UE2 can perform SL communication with each other, wherein the terminal UE1 can be assumed to be a SL transmitting terminal, and the terminal UE2 can be assumed to be a SL receiving terminal. In this case, the terminal UE1 can perform SL transmit power control for SL transmission. As given in Equation 1, the parameters of the SL transmit power of the terminal UE1 may include at least P 0 , α, path loss estimate, and the size of the allocated frequency block.

[0150] [Equation 1]

[0151] SL transmission power = min{P cmax , P Congestion , P 0 +α·PL+10log10(M·2 μ )+Δ}[dBm].

[0152] In Equation 1, each parameter can mean the following information:

[0153] -P cmax : This may mean the maximum transmit power of the terminal and may be determined by the terminal based on a P-max value configured by the base station through system information or RRC (a pre-configured value in the absence of a base station), a power level of the terminal embedded in the terminal, etc.;

[0154] -P Congestion: This may represent a parameter reflecting the congestion level of the sidelink transmitting terminal, and may mean a maximum transmit power available to the SL transmitting terminal according to the congestion level as a parameter reflecting the congestion level of the SL transmitting terminal. More specifically, when the base station determines that the congestion level in the resource pool configured by the base station is high, the base station may send P to the SL transmitting terminal through system information or RRC establishment. Congestion In another example, the SL sending terminal can configure the PC in the unicast link connection establishment through PC-5RRC. ongestion In another example, the SL sending terminal may use the P included in the preconfigured resource pool information. Congestion .P Congestion The unit can be [dBm], ranging from -41[dBm] to 31[dBm] in 1[dBm] increments. Congestion It may have a relationship with the priority of the SL channel transmitted by the SL transmitting terminal. For example, when the priority of the SL channel transmitted by the SL transmitting terminal is high, the transmission of the SL channel must be successfully performed despite the high congestion level, so that the P configured or pre-configured by the base station or PC-5RRC Congestion On the other hand, when the priority of the SL channel sent by the SL sending terminal is low and the congestion level is high, there may be no problem even if the SL channel fails to send (or even if the sending is abandoned), so that the P configured or pre-configured by the base station or PC-5RRC Congestion It can be very small (for example -41 [dBm]). The above-mentioned SL channel may include a SL synchronization channel.

[0155] -P 0 : This may mean using system information from a base station or a value configured by RRC (or a pre-configured value in the absence of a base station) to ensure the link quality of the receiving terminal.

[0156] -α: This may mean a value between 0 and 1 as a parameter for compensating for path loss (PL), and may be a value configured by the base station through system information or RRC (in the absence of a base station, a preconfigured value). For example, for α=1, path loss may be compensated 100%, and for α=0.8, path loss may be compensated 80%.

[0157] -M: This can mean the size of the frequency block allocated to SL transmission. In this case, 2 μIt can be a parameter used to compensate for different power spectral densities (PSD) depending on the subcarrier spacing. For example, when a subcarrier spacing of 15kHz is used, μ=0. Although the same number of frequency blocks is used, when the subcarrier spacing is doubled to 30kHz, the PSD can be reduced to half of the case of using a subcarrier spacing of 15kHz. Therefore, in order to compensate for this, the power needs to be increased by two times. More specifically, when two frequency blocks are used, for a subcarrier spacing of 15kHz, 10log10(2×2 0 )=3dB transmission power, but for a 30kHz subcarrier spacing, the transmission power needs to be increased to 10log10(2×2 1 )=6dB to keep the same PSD as the subcarrier spacing of 15kHz.

[0158] -PL: This may mean a path loss estimate. In this case, the path loss value may be estimated using Equation 2.

[0159] [Equation 2]

[0160] Signal Transmit Power for Path Loss Estimation - Reference Signal Received Power (RSRP) measurement of the signal used for path loss estimation.

[0161] Equation 2 may be applied differently depending on the scenario as described below.

[0162] >When the signal used for path loss estimation is a SL signal: The SL transmitting terminal UE1 may transmit a SL reference signal to the SL receiving terminal UE2. The SL receiving terminal UE2 may receive the SL reference signal, measure the RSRP value, and report the measured RSRP value to the SL transmitting terminal UE1. In this case, the RSRP value may be transmitted through the PSFCH or PSSCH. When the RSRP value is transmitted through the PSSCH, the RSRP value may be transmitted through the MAC layer or the RRC layer. The SL transmitting terminal UE1 may estimate the SL path loss value by using Equation 2 based on the transmit power of the reference signal transmitted thereby to the SL receiving terminal UE2 and the RSRP value reported from the SL receiving terminal UE2. In another example, the SL transmitting terminal UE1 may transmit information about the transmit power of the reference signal transmitted thereby to the SL receiving terminal UE2. The SL receiving terminal UE2, which has received the information, may measure the RSRP value based on the reference value transmitted by the SL transmitting terminal UE1, and estimate the path loss value by Equation 2. The SL receiving terminal UE2 may transmit the SL path loss value to the SL transmitting terminal UE1 through the PSFCH or PSSCH. When the SL path loss estimate is sent via the PSSCH, a medium access control (MAC) control element (CE) may be used. Fig.11As shown, when the distance between the SL transmitting terminal UE1 and the SL receiving terminal UE2 is greater than the distance between the SL transmitting terminal UE1 and the base station gNB, the SL signal sent by the SL transmitting terminal UE1 can interfere with the gNB receiving signal. Fig.11 and 12 The figure shows the level of interference caused by SL signals to gNB receiving signals. Fig.11 , it can be assumed that SL control information or data information can be sent in RB index 12 (using one RB). In addition, refer to Fig.12 , it can be assumed that five RBs from RB index 12 to RB index 17 can be used to transmit SL control information or data information. Fig.11 In FIG. 1 , when SL transmission is performed in RB index 12, transmit power needs to be generated in the corresponding RB index 12, but transmit power may also be generated in nearby RB indexes (e.g., 9, 10, 11, 13, 14, and 15) due to interference (in-band emission). Fig.12 As shown, the amount of interference may increase with the number of RBs allocated to SL transmission. Therefore, the SL transmitting terminal located near the base station gNB may need to use low transmit power so as not to interfere with the UL receive signal of the base station gNB.

[0163] >When the signal used for path loss estimation is the DL signal of the base station gNB: In order to reduce the aforementioned interference to the received signal of the base station gNB, the SL transmitting terminal UE1 can use the DL path loss value with the base station gNB in ​​Equation 1. More specifically, the SL transmitting terminal UE1 can estimate the DL path loss value through the CSI-RS sent by the base station gNB. In another example, the SL transmitting terminal UE1 can estimate the DL path loss value by using the secondary synchronization signal (SSS) sent by the base station gNB, or by using both the SSS and DMRS sent through the physical broadcast channel (PBCH). The SL transmitting terminal UE1 can basically estimate the DL path loss value by using the SSS, and determine whether to also use the DMRS sent through the PBCH based on the implementation of the SL transmitting terminal UE1. In another example, the SL transmitting terminal UE1 can estimate the DL path loss value by using the CSI-RS to obtain the channel information sent by the base station gNB. Whether the SL transmitting terminal UE1 must estimate the DL path loss value through any one of the signals SSS and CSI-RS may depend on the connection state between the SL transmitting terminal UE1 and the base station gNB. For example, when the SL transmitting terminal UE1 is in an RRC connected state with the base station gNB, the SL transmitting terminal UE1 can be configured by the base station gNB whether to estimate the DL path loss value through any one signal. When the SL transmitting terminal UE1 is in an RRC idle state with the base station gNB, the SL transmitting terminal UE1 can estimate the DL path loss value by using the SSS sent through the PBCH or both the SSS and the DMRS. As described above, the SL transmitting terminal UE1 can basically estimate the DL path loss value by using the SSS, and determine whether to also use the DMRS sent through the PBCH based on the implementation of the SL transmitting terminal UE1. At the same time, the base station gNB can send information about the transmit power of the reference signal to the SL transmitting terminal UE1 through system information or RRC establishment, and the SL transmitting terminal UE1 can measure the RSRP value by using the reference signal sent by the base station gNB. The SL transmitting terminal UE1 can estimate the DL path loss value by using Equation 2 based on the transmit power of the reference signal sent from the base station gNB and the RSRP value measured thereby. By using the DL path loss value, the problem of Fig.11 and 12 The interference of the received signal of the base station gNB is shown.

[0164] >The base station gNB can configure reference signals for the terminal to use for PL (path loss) estimation (i.e., whether to use SSS or CSI-RS for DL ​​path loss estimation, or to use SL reference signal for SL path loss estimation).

[0165] -Δ: This can mean a transmit power control (TPC) command for closed-loop power control or other RRC parameters. For example, this can mean an offset value of the transmit power according to the format of the SL feedback channel. In another example, this can mean a compensation value of the transmit power according to the spectral efficiency of the SL feedback channel. For example, as the spectral efficiency increases (i.e., when fewer resources are used to transmit the same bits or more bits are transmitted in the same resources), a higher transmit power is required, such that it can be a parameter for compensating the transmit power based on the spectral efficiency. Although Δ includes one parameter in Equation 1, Δ can also include a combination of two or more parameters.

[0166] Fig.11 Illustrates the interference caused by a frequency block transmitted by a sidelink terminal to an adjacent frequency block according to an embodiment of the present disclosure.

[0167] Fig.12 Illustrates the interference caused by a frequency block transmitted by a sidelink terminal to an adjacent frequency block according to an embodiment of the present disclosure.

[0168] Fig.13 Illustrates a method for controlling the transmit power of an SL synchronization channel according to an embodiment of the present disclosure.

[0169] Reference Figure 11-13 , according to an embodiment of the present disclosure, whether to transmit the SL synchronization channel can depend on the capabilities of the SL terminal. For example, an SL terminal having the transmission capability of the SL synchronization channel can transmit the SL synchronization channel based on a command from the base station. In this case, the SL terminal can be in an RRC connected state with the base station, and the base station can command the SL terminal to transmit the SL synchronization channel via RRC or DCI.

[0170] In another example, an SL terminal having the transmission capability of the SL synchronization channel can autonomously determine whether to transmit the SL synchronization channel. In this case, even when the SL terminal is within the coverage area of the base station, the SL terminal may be in an RRC idle state. In this case, the base station can configure a threshold for the DL RSRP via the SIB. The SL terminal that has received the system information from the base station can compare the measured DL RSRP value (R_measure) with the base station with the threshold value of the DL RSRP value (R_threshold) and transmit the SL synchronization channel. More specifically, for R_measure < R_threshold or R_measure ≤ R_threshold, the SL terminal can transmit the SL synchronization channel.

[0171] Together with the command for sending the SL synchronization channel, the base station may send a transmit power parameter for SL synchronization channel transmission to the SL terminal through system information and / or RRC establishment. In this case, the transmit power parameter for SL synchronization channel transmission may mean P stated in Equation 1. 0 , α, μ, M or Δ.

[0172] In addition, the transmit power parameter for SL synchronization channel transmission may include information about whether the terminal needs to configure the transmit power by estimating the DL path loss, whether the terminal needs to configure the transmit power by estimating the SL path loss, or whether the terminal needs to configure the transmit power by estimating both the DL path loss and the SL path loss. This information may be sent by the base station to the terminal through system information or RRC, and may mean at least one of the following information:

[0173] 1) Sending link information used by the terminal for path loss estimation through indication or configuration of the reference signal type

[0174] For example, the base station may send information about the reference signal to be used by the terminal to estimate PL (path loss) based on an indication of the reference signal to be used among the DL SSB, DL CSI-RS, or DMRS of the SL data channel. For example, through a protocol between the base station and the terminal, indicator index 0 may mean DL SSB, indicator index 1 may mean DL CSI-RS, and indicator index 2 may mean DMRS of the SL data channel. Indicator index 3 may mean using both DL SSB and DMRS of the SL data channel. Indicator index 4 may mean using both DL CSI-RS and DMRS of the SL data channel. In another example, the system information or RRC configuration information may explicitly include the type of reference signal to be used by the terminal for path loss estimation.

[0175] 2) By sending power parameters, such as P 0 , α, etc., and are link information used by the sending terminal for path loss estimation.

[0176] For example, the base station may configure differently a transmit power parameter that may be used to apply a DL path loss and a transmit power parameter that may be used to apply a SL path loss. In operations S1303 and S1305, the terminal that has received the transmit power parameter in operation S1301 may determine whether to apply a DL path loss or a SL path loss. More specifically, the base station may configure differently the parameter P of equation 1 by different parameters according to the application of the DL path loss and the application of the SL path loss. 0 and α For example, when DL path loss must be applied, the base station can configure P 0_DL and αDL , and when SL path loss must be applied, the base station can configure P 0_SL and α SL When both DL path loss and SL path loss must be applied, the base station can configure P 0_DL , α DL , P 0_SL and α SL .

[0177] Through at least one of the aforementioned methods, the terminal sending the SL synchronization channel can determine whether to configure the transmit power based on the DL path loss with the base station, whether to configure the transmit power based on the SL path loss with another SL terminal, or whether to configure the transmit power based on both the DL path loss and the SL path loss.

[0178] The transmission power parameter for SL synchronization channel transmission and the aforementioned parameters may include the parameter for estimating path loss (PL) of Equation 1, which may mean the transmission power of the reference signal for path loss estimation mentioned in Equation 2.

[0179] More specifically, the base station may configure the terminal to use DL SSB or DL ​​CSI-RS through system information or RRC. The terminal that has received the information for sending the SL synchronization channel may use the DL SSB or DL ​​CSI-RS sent by the base station to perform the path loss (PL) estimation of equations 1 and 2. When the base station configures the terminal to use DL SSB, the base station may send information about the SSB transmit power to the terminal through system information or RRC signaling. Similarly, when the base station configures the terminal to use DL CSI-RS, the base station may send information about the CSI-RS transmit power to the terminal through signaling of at least one of system information, RRC or DCI. The method of signaling information about the CSI-RS transmit power may be performed through two operations. For example, the base station may send information about the SSB transmit power to the terminal through system information or RRC signaling, and send an offset (difference) of the SSB transmit power and the CSI-RS transmit power to the terminal through signaling of at least one of system information, RRC or DCI.

[0180] At least one of the above transmit power parameters may be included in the SL resource pool configuration information. For example, SL resource pool 1 may be configured with P 0_1 , α 1 , μ 1 、M 1 and Δ 1 , and SL resource pool 2 can be configured with P 0，2 , α 2 , μ 2 、M 2 and Δ2 In this case, each transmit power parameter that can be set for the SL resource pool can be different or the same for the SL resource pool. For example, the P configured for SL resource pool 1 0，1 and P configured for SL resource pool 2 0，2 can have values ​​equal to or different from each other. Similarly, α configured for SL resource pool 1 1 and α configured for SL resource pool 2 2 Can have the same or different values ​​from each other.

[0181] At the same time, reference Fig.13 In operation S1303, the terminal having received the transmission power parameter may receive a command from the base station on whether to transmit the SL synchronization channel at the maximum transmission power. In operations S1305 and S1307, the terminal having received the command may transmit the SL synchronization channel at the maximum transmission power, as shown in Equation 3.

[0182] [Equation 3]

[0183] P S-PSS =P CMAX，PSBCH |

[0184] P S-SSS =P CMAX.S-SSS

[0185] In [Equation 3], P S-PSS can mean the transmission power of S-PSS, and P S-SSSIt can mean the transmission power of S-SSS. When the base station commands the terminal to transmit the SL synchronization channel at the maximum transmission power, the terminal can transmit the SL synchronization channel by configuring the transmission power of S-PSS to be the same as the maximum transmission power of PSBCH. The transmission power of S-SSS can be set to be equal to the maximum transmission power of S-SSS for transmission. S-PSS and PSBCH apply the same power backoff or the same maximum power reduction (MPR) so that the maximum transmission power of S-PSS and the maximum transmission power of PSBCH can be equal to each other. However, since S-SSS applies more power backoff or more MPR compared to S-PSS / PSBCH, there may be a separate maximum transmission power in S-SSS, unlike in S-PSS / PSBCH. In this way, the power backoff of S-SSS and the power backoff of S-PSS / PSBCH are different because the peak-to-average power ratio (PAPR) characteristic of the sequence (gold sequence) used in S-SSS is much worse than the Zadoff-Chu sequence used in S-PSS. For example, when the PAPR characteristics of the sequences used in S-PSS and S-SSS are similar, the same power backoff or the same MPR may be applied to S-PSS, S-SSS, and PSBCH. In this case, Equation 3 may be replaced by Equation 4.

[0186] [Equation 4]

[0187] P S-PSS =P S-SSS =P CMAX，PSBCH |=P CMAX

[0188] In Equation 4, P CMAX can have the same P as Equation 1 CMAX Same meaning.

[0189] Meanwhile, when the base station does not indicate or configure the transmission of the maximum transmission power of the SL synchronization channel, the terminal may determine the transmission power of the S-PSS, S-SSS, and PSBCH by using Equations 5 and 6.

[0190] [Equation 5]

[0191] P S-PSS =P PSBCH =min{P CMAX，PSBCH , 10log 10 (2 μ ·M)+P 0 +α·PL}[dBm]

[0192] P S-SSS =min{P CMAX，S-SSS , 10log 10 (2μ .M)+P 0 +α·PL}[dBm]

[0193] When the DL path loss value is applied to Equation 5, Equation 5 may be as follows.

[0194] P S-PSS =P PSBCH =min{P CMAX，PSBCH , 10log 10 (2 μ ·M)+P 0_DL +α DL ·PL DL}[dBm]

[0195] P S-SSS =min{P CMAX，S-SSS , 10log 10 (2 μ ·M)+P 0_DL +α DL ·PL DL}[dBm]

[0196] When the SL path loss value is applied to Equation 5, Equation 5 may be as follows.

[0197] P S-PSS =P PSBCH =min{P CMAX，PSBCH , 10log 10 (2 μ ·M)+P 0_SL +α SL ·PL SL}[dBm]

[0198] P S-SSS =min{P CMAX，S-SSS ,101og 10 (2 μ ·M)+P 0_SL +α SL ·PL SL}[dBm]

[0199] When both the DL path loss value and the SL path loss value are applied to Equation 5, Equation 5 may be as follows.

[0200] P S-PSS =P PSBCH =min{P CMAX，PSBCH ,min(A,B)}[dBm]

[0201] P S-SSS =min{P CMAX，S-SSS ,min(A,B)}[dBm]

[0202] In the equation, A = 10log 10 (2 μ ·M)+P 0_DL +α DL ·PL DL and B = 10log 10 (2 μ ·M)+P 0_SL +α SL ·PL SL

[0203] [Equation 6]

[0204] P S-PSS =P S-SSS =P PSBCH =min{P CMAX , 10log 10 (2 μ ·M)+P 0 +α·PL}[dBm]

[0205] When the DL path loss value is applied to Equation 6, Equation 6 may be as follows.

[0206] P S-PSS =P S-SSS =P PSBCH =min{P CMAX , 10log 10 (2 μ ·M)+P 0_DL +α DL ·PL DL}[dBm]

[0207] When the SL path loss value is applied to Equation 6, Equation 6 may be as follows.

[0208] P S-PSS =P S-SSS =P PSBCH =min{P CMAX , 10log 10 (2 μ ·M)+P 0_SL +α SL ·PL SL}[dBm]

[0209] When both the DL path loss value and the SL path loss value are applied to Equation 6, Equation 6 may be as follows.

[0210] P S-PSS =P S-SSS =PPSBCH=min{P CMAX ,min(A,B)}[dBm]

[0211] In this case, A = 10log 10 (2 μ ·M)+P 0_DL +α DL ·PL DL and B = 10log 10 (2 μ ·M)+P 0_SL +α SL ·PL SL .

[0212] When S-PSS / PSBCH and S-SSS use different power backoffs or different MPRs, Equation 5 may be applied. Meanwhile, when S-PSS / PSBCH and S-SSS use the same power backoff or the same MPR, Equation 6 may be applied, where P in Equation 6 is CMAX It can be obtained from Equation 5 that P CMAX，PSBCH | or P CMAX，S-SSS replace.

[0213] In Equation 3, Equation 4, Equation 5, Equation 6 and their modified equations, P 0_DL , α DL , P 0_SL and α SL It can be used with the transmit power control P for SL control channel and data channel. 0_DL , α DL , P 0_SL and α SL In equation 3, equation 4, equation 5, equation 6 and their modified equations, P 0_DL , α DL , P 0_SL and α SL It can be used with the transmit power control P for the SL feedback channel 0_DL , α DL , P 0_SL and α SL Same or different.

[0214] In operation S1309, the terminal that determines the transmission power of the S-PSS, S-SSS and PSBCH according to at least one of Equation 3, Equation 4, Equation 5, Equation 6 or modified equations thereof can transmit the S-SSB based on the corresponding transmission power.

[0215] At the same time, Fig.13 Unlike the example shown in FIG. 1 , the operation of commanding the terminal to transmit the SL synchronization channel at the maximum transmission power performed by the base station can be omitted. Fig.13 In the process, the operation of determining whether the terminal sends the SL synchronization channel with the maximum transmission power can be omitted.

[0216] Fig.14 The operation of timeline resource allocation of the SL feedback channel according to an embodiment of the present disclosure is shown.

[0217] refer to Fig.14 , the time axis resource of PSFCH (SL feedback channel) may have a period of four time slots (N=4) starting from time slot 0. Therefore, the time axis resource of PSFCH (SL feedback channel) may exist in time slot 0, time slot 4, time slot 8, time slot 2, and time slot 6. Fig.14 , the time relationship (i.e., K) between the PSSCH transmitted by the SL transmitting terminal (i.e., the PSSCH received by the SL receiving terminal) and the PSFCH that must be transmitted by the SL receiving terminal is assumed to be 3 time slots. For example, in a time shorter than 3 time slots, the SL receiving terminal may not be able to decode the PSSCH transmitted from the SL transmitting terminal, prepare HARQ-ACK information and HARQ-NACK information, and transmit the PSFCH. Therefore, if Fig.12 As shown, HARQ-ACK / NACK information corresponding to the PSSCH received by the SL receiving terminal in time slots 0 and 1 can be sent in time slot 4. HARQ-ACK / NACK information corresponding to the PSSCH received by the SL receiving terminal in time slots 2, 3, 4, and 5 can be sent in time slot 8. In addition, HARQ-ACK / NACK information corresponding to the PSSCH received by the SL receiving terminal in time slots 6, 7, 8, and 9 can be sent in time slot 2.

[0218] refer to Fig.14 , the SL feedback channel (PSFCH) that transmits HARQ-ACK / NACK information of the SL data channel (PSSCH) may exist in some time slots with a specific period, rather than in every time slot. For example, Fig.14 An example of a period in which the PSFCH has four time slots is shown. One SL receiving terminal may receive different PSSCHs from multiple SL transmitting terminals. In this case, the SL receiving terminal may have to send multiple SL feedback channels. In addition, one SL receiving terminal may receive different PSSCHs from the same SL transmitting terminal. In this case, the SL receiving terminal may have to send multiple SL feedback channels. To this end, it is necessary to consider a method for determining the transmit power for multiple PSFCH transmissions.

[0219] Fig.15 The operation of a method for determining transmission power when one SL receiving terminal transmits a plurality of SL feedback channels according to an embodiment of the present disclosure is illustrated.

[0220] When a SL receiving terminal sends a SL feedback channel, the transmit power of PSFCH can be determined by Equation 7.

[0221] [Equation 7]

[0222] P PSFCH =min{P CMAX , 10log 10 (2 μ ·M)+P 0_PSFCH +α PSFCH PL[dBm]

[0223] In Equation 7, when the size of the frequency block used for one PSFCH transmission is 1, M may be omitted (ie, M=1). In Equation 7, the path loss (PL) value may mean a DL path loss value. In this case, as shown in FIG. Figures 10 to 13 As described above, the SL receiving terminal sending the PSFCH can estimate the DL path loss value through the SSB, the SSB and DMRS of the PBCH, or the CSI-RS sent from the base station. 0_PSFCH Can mean P 0_DL_PSFCH , and α PSFCH Can mean α DL_PSFCH .

[0224] At the same time, when the SL receiving terminal sending PSFCH is outside the coverage of the base station, it can be pre-configured, such as α in Equation 7 PSFCH = 0. For example, when the SL receiving terminal is outside the coverage of the base station, the transmit power of PSFCH can be set by min{P CMAX , 10log 10 (2 μ ·M)+P 0_PSFCH In another example, when the SL receiving terminal is outside the coverage of the base station, the transmit power of the PSFCH may be fixed to a preconfigured value instead of being determined by an equation (eg, Equation 7).

[0225] In an embodiment of the present disclosure, Equation 7 may mean an equation for a method of determining PSFCH transmission power when a SL receiving terminal transmits a PSFCH. Fig.14 As described above, one SL receiving terminal can send multiple PSFCHs, so it is necessary to consider a method for determining the PSFCH transmission power in this case.

[0226] The number of PSFCHs that can be transmitted simultaneously by a terminal can be assumed to be N (in Fig.13 In, N means the period of PSFCH time resources, but in Fig.15In this case, N may mean the number of PSFCHs that can be simultaneously transmitted by one terminal). In this case, N may have different values ​​according to the capabilities of the SL terminal. For example, SL terminal-1 may have N=4, SL terminal-2 may have N=2, and SL terminal-3 may have N=1. When the SL terminal exists within the coverage of the base station (within the coverage), the capabilities of the SL terminal may be reported to the base station. The base station may reflect the capabilities of the terminal in the resource allocation of the SL feedback channel (i.e., in the setting of the time period of the PSFCH time resource). At the same time, when the PC-5RRC connection establishment is performed, the SL transmitting terminal and the SL receiving terminal may exchange information about the capabilities.

[0227] The above N value may mean the maximum number of PSFCHs simultaneously transmitted by the SL terminal, and in actual PSFCH transmission, the terminal may transmit PSFCH by using a value less than N. For example, for N=4, the SL terminal may simultaneously transmit two PSFCHs less than four PSFCHs.

[0228] refer to Fig.15 In operation S1501, the SL receiving terminal that will transmit the PSFCH may receive a parameter for configuring the PSFCH transmit power from the base station through system information and / or RRC establishment. In this case, the parameter for configuring the PSFCH transmit power may mean P 0 , α, μ, M, Δ or Figures 10 to 13 At least one of the information about the link to which the path loss value will be applied. The S1 receiving terminal that has received the parameter can determine the number of PSSCHs required for PSFCH transmission. In this case, the PSFCH transmission resources can be determined based on the frequency resources of the PSSCH (for example, the starting subchannel index for receiving the PSSCH) and the time resources of the PSSCH (for example, the time slot index for receiving the PSSCH). In this way, when a PSSCH that requires PSFCH transmission is received, the SL receiving terminal can determine the PSFCH transmission power by Equation 7.

[0229] If it is determined in operation S1503 that a single PSSCH is received, the process moves to operation S1505, in which the PSFCH transmission power is set based on the power control formula for a single PSFCH transmission. On the other hand, if it is determined in operation S1503 that multiple PSSCHs that require PSFCH transmission are received and the PSFCHs need to be transmitted simultaneously, in operation S1509, the SL terminal may determine how many PSFCHs will be transmitted simultaneously. In this case, as described above, N, which indicates the maximum number of PSFCHs that can be transmitted simultaneously, may vary with the capabilities of the terminal. At the same time, the number of PSFCHs that the SL receiving terminal must transmit simultaneously may be configured for each resource pool. For example, assuming that the number of PSFCHs that the SL receiving terminal must transmit simultaneously is L, the condition of L≤N must be satisfied. More specifically, when a SL receiving terminal with capabilities of N=4, N=3, and N=2 must transmit PSFCHs in one resource pool, respectively, L may be equal to 2 (L=2) in the corresponding resource pool. For example, considering the capabilities of the SL receiving terminals, L can be set in the resource pool in which PSFCH transmission is possible based on the SL terminal with the minimum capability.

[0230] As described above, when L (L≤N) is set in the resource pool, the SL receiving terminal may have to send a smaller number of PSFCHs than N when the PSFCH is transmitted. In another example, due to a shortage of PSFCH resources, the SL receiving terminal may have to send a smaller number of PSFCHs than N when the PSFCH is transmitted. In this case, an operation of selecting L PSFCH transmission candidates from N PSFCH transmission candidates may be added. For example, as described above, the PSSCH resources may have a mapping relationship with the PSFCH resources. Since each SL data sent through the PSSCH may have a priority received from a higher layer, the SL receiving terminal may select L PSFCHs to be actually sent from the N PSFCH transmission candidates based on the priority (in this case, L may be greater than or equal to 1).

[0231] In operation S1511, as described above, the SL receiving terminal that has selected the number of PSFCHs that must be transmitted simultaneously based on priority and / or the number of PSFCH resources when transmitting can configure the transmission power of the PSFCH by using at least one of the following methods.

[0232] Method 1) Determine the PSFCH transmission power based on the number L of PSFCHs to be transmitted simultaneously

[0233] Method 1) may refer to determining the transmission power of L PSFCHs based on Equation 8.

[0234] [Equation 8]

[0235] P PSFCH =min{P CMAX，L , 10log 10 (2 μ ·M·L)+P 0_PSFCH +α PSFCH PL[dBm]

[0236] In Equation 8, P CMAX，L It can indicate the maximum transmission power allowed by the terminal when sending L PSFCHs simultaneously. CMAX It may refer to the maximum transmit power of the terminal, which is configured to be independent of the number of PSFCHs to be transmitted, so it may not be desirable for the maximum transmit power of the terminal to change with the number of PSFCHs transmitted simultaneously. Therefore, equation 8 may not be appropriate. In another example, equation 9 may be considered.

[0237] [Equation 9]

[0238] P PSFCH =min{P CMAX , 10log 10 (2 μ ·M·L)+P 0_PSFCH +α PSFCH PL[dBm]

[0239] In Equation 9, the SL receiving terminal that will simultaneously send L PSFCHs can be based on Z_dB=10log 10 (2 μ ·M·L)+P 0_PSFCH +α PSFCH ·PL is used to calculate the transmit power of L PSFCHs. CMAX In the case of Z_dB ≥ P, Z_dB can be used as the transmit power of L PSFCHs. CMAX , the terminal can equally scale down the transmit power of L PSFCHs so that Z_dB is less than or equal to P CMAX .

[0240] More specifically, the transmission power of one PSFCH configured for PSFCH transmission may be defined as X_dB=10log 10 (2 μ ·M)+P 0_PSFCH +α PSFCH·PL, where X = 10^(X_dB / 10)|. For example, X_dB in the dB scale is converted to X in the linear domain. In this case, a definition of Y = L·X can be made, where X (the linear domain expression of the transmit power of the PSFCH configured in the transmission of one PSFCH) is multiplied by L (i.e., L PSFCHs are transmitted). The linear domain Y can be changed into a dB value as follows. Y_dB = 10log 10 (Y) = 10log 10 (L·X)=10log 10 (L)+10log 10 (X) = 10log 10 (L)+X_dB in this case, since X_dB is defined above as 10log 10 (2 μ ·M)+P 0_PSFCH +α PSFCH PL, so Y_dB can be expressed as 10log 10 (L)+10log 10 (2 μ ·M)+P 0_PSFCH +α PSFCH PL, which may be the same as Z_dB defined above.

[0241] At the same time, the above-mentioned reduction operation can be performed in the linear domain instead of the dB domain. For example, Z_dB can be converted to the linear domain (Z = 10^(X_dB / 10)), and P CMAX can be converted to the linear domain (10^(P CMAX / 10)). In this case, in order to satisfy 10^(P CMAX / 10)≤β·Z, scaling by β may be performed, where β may have a value of 0≤β≤1.

[0242] Method 2) Determine the transmit power of one PSFCH based on the number of PSFCHs to be transmitted simultaneously and scale it.

[0243] Method 2) may be similar to method 1), but may have the following differences: For the transmission of N PSFCH transmissions, Equation 10 may be considered.

[0244] [Equation 10]

[0245] P PSFCH-1 =min{P CMAX , 10log 10 (2 μ_1 ·M 1 )+P 0_PSFCH-1 +α PSFCH-1 ·PL 1}[dBm]

[0246] P PSFCH-2 =min{P CMAX , 10log 10 (2 μ_2 ·M 2 )+P 0_PSFCH-2 +α PSFCH-2 ·PL 2}[dBm]

[0247] P PSFCH-N =min{P CMAX , 10log 10 (2 μ_N ·M N )+P 0_PSFCH-N +α PSFCH-N ·PL N}[dBm]

[0248] In Equation 10, P PSFCH-N It can refer to the transmission power of the nth PSFCH, and μ_N, M N , P 0_PSFCH-N , α PSFCH-N and PL N It can represent the subcarrier spacing of the nth PSFCH, the size of the allocated frequency block, P 0 , α and path loss value. When N PSFCHs are sent to different SL transmitting terminals, at least one of the above parameters may be different. For example, the first PSFCH and the second PSFCH may be sent to SL transmitting terminal-1, and the third PSFCH may be sent to SL transmitting terminal-2. In this case, the transmit power of each PSFCH may be different. When multiple PSFCHs are sent to the same transmitting terminal, at least one of the above parameters may have different values ​​based on the configuration of the base station, etc.

[0249] When the SL receiving terminal must send L PSFCHs out of N PSFCHs to the same transmitting terminal or different transmitting terminals at the same time, the transmit power of each PSFCH needs to be configured to be the same. This is because when the transmit power of each PSFCH transmitted in the same symbol is different, interference may be caused between the PSFCHs to be transmitted due to the imbalance of the transmit power of each PSFCH. To this end, at least one of the following operations can be considered.

[0250] Method 2-A) The transmit power of each of the L PSFCHs can be calculated based on equation 10, and the transmit power can be reduced or amplified so that the transmit power of each of the other PSFCHs except the PSFCH with the highest priority is equal to each other based on the transmit power of the PSFCH with the highest priority. In this case, as described above, the operation of reducing or amplifying can be performed in the linear domain.

[0251] Method 2-B) calculates the transmission power of each of the L PSFCHs based on equation 10, and unlike method 2-A), regardless of the priority, the transmission power can be increased proportionally so that the transmission power of each of the other PSFCHs except the PSFCH with the highest transmission power is equal to each other based on the transmission power of the PSFCH with the highest transmission power. Alternatively, the transmission power can be reduced so that the transmission power of the other PSFCHs except the PSFCH with the lowest transmission power is equal to each other based on the transmission power of the PSFCH with the lowest transmission power. In this case, as described above, the reduction or enlargement operation can be performed in the linear domain.

[0252] By method 2-A) or method 2-B), when calculating the transmit power value of each of the L PSFCHs transmitted simultaneously and the transmit power of each of the L PSFCHs remains equal, the S1 receiving terminal can calculate the transmit power of the L PSFCHs based on equation 9. As described above, it can be based on Z_dB=10log 10 (2 μ ·M·L)+P 0_PSFCH +α PSFCH ·PL is used to calculate the transmit power of L PSFCHs. CMAX In the case of Z_dB ≥ P, Z_dB can be used as the transmit power of L PSFCHs. CMAX , the terminal may perform additional scaling down operations to equally maintain the transmit power of the L PSFCHs so that Z_dB is less than or equal to P CMAX .

[0253] The present disclosure relates to a method and apparatus for controlling the transmission power of a SL synchronization channel in a wireless communication system, wherein the method according to an embodiment of the present disclosure may include: receiving a parameter for controlling the transmission power of the SL synchronization channel from a base station, determining the transmission power of the SL synchronization channel based on the parameter, and sending the SL synchronization channel based on the configuration of the transmission power in operation S1507.

[0254] The present disclosure relates to a method and apparatus for controlling the transmit power of a SL feedback channel in a wireless communication system, wherein the method according to an embodiment of the present disclosure may include: receiving a parameter for controlling the transmit power of the SL feedback channel from a base station, determining the transmit power of the SL feedback channel based on the parameter, and sending the SL feedback channel based on the configuration of the transmit power.

[0255] Fig.16 is a block diagram of a structure of a transmitting terminal according to an embodiment of the present disclosure.

[0256] refer to Fig.16 According to the present disclosure, a transmitting terminal may include a transceiver 1610, a memory 1620, and a processor 1630. According to the above communication method of the transmitting terminal, the processor 1630, the transceiver 1610, and the memory 1620 of the transmitting terminal may operate. However, the components of the transmitting terminal are not limited to the above examples. For example, the transmitting terminal may include more or less components than the above components. In addition, the processor 1630, the transceiver 1610, and the memory 1620 may be implemented in the form of a single chip. The processor 1630 may refer to one or more processors.

[0257] The transceiver 1610 may be collectively referred to as a receiver and a transmitter of a transmitting terminal, and transmits signals to and receives signals from a base station. The signals transmitted to and received from the base station may include control information and data. To this end, the transceiver 1610 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is merely an example of the transceiver 1610, and its components are not limited to the RF transmitter and the RF receiver.

[0258] The transceiver 1610 may receive a signal through a radio channel and output the received signal to the processor 1630 , and transmit a signal output from the processor 1630 through a radio channel.

[0259] The memory 1620 may store programs and data required for the operation of the transmitting terminal. The memory 1620 may also store control information or data included in a signal obtained by the transmitting terminal. The memory 1620 may include a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk (CD)-ROM, a digital versatile disk (DVD), etc., or a combination thereof.

[0260] The processor 1630 may control a series of processes so that the transmitting terminal operates according to the above-mentioned embodiments of the present disclosure. For example, according to an embodiment of the present disclosure, the processor 1630 may control the components of the transmitting terminal to perform a method for configuring the transmission power of the SL synchronization channel and the SL feedback channel. For example, the transceiver 1610 may receive a data signal including a control signal, and the processor 1230 may determine a reception result of the data signal.

[0261] Fig.17 is a block diagram of a structure of a receiving terminal according to an embodiment of the present disclosure.

[0262] refer to Fig.17 , a receiving terminal according to the present disclosure may include a transceiver 1710, a memory 1720, and a processor 1730. According to the above communication method of the base station, the processor 1730, the transceiver 1710, and the memory 1720 of the receiving terminal may operate. However, the components of the receiving terminal are not limited to the above examples. For example, the receiving terminal may include more or fewer components than the above components. In addition, the processor 1730, the transceiver 1710, and the memory 1720 may be implemented in the form of a single chip. The processor 1730 may refer to one or more processors.

[0263] The transceiver 1710 may be collectively referred to as a receiver and a transmitter of a receiving terminal, and transmits a signal to a base station and receives a signal from a base station. The signals transmitted to and received from the base station may include control information and data. To this end, the transceiver 1710 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is merely an example of the transceiver 1710, and its components are not limited to the RF transmitter and the RF receiver.

[0264] The transceiver 1710 may receive a signal through a radio channel and output the received signal to the processor 1730 , and transmit a signal output from the processor 1730 through a radio channel.

[0265] The memory 1720 may store programs and data required for the operation of the receiving terminal. The memory 1720 may also store control information or data included in the signal obtained by the receiving terminal. The memory 1720 may include a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc. or a combination thereof.

[0266] The processor 1730 may control a series of processes so that the receiving terminal operates according to the above-mentioned embodiments of the present disclosure. For example, according to an embodiment of the present disclosure, the processor 1730 may control the components of the receiving terminal to perform a method for configuring the transmission power of the SL synchronization channel and the SL feedback channel. For example, the transceiver 1710 may receive a data signal including a control signal, and the processor 1730 may determine a reception result of the data signal.

[0267] The method according to the embodiments of the present disclosure described in the claims or specification of the present disclosure may be implemented by hardware, software or a combination thereof.

[0268] When these methods are implemented as software, a computer-readable storage medium or a computer program product in which one or more programs (software modules) are stored may be provided. One or more programs stored in a computer-readable storage medium or a computer program product may be configured to be executed by one or more processors in an electronic device. One or more programs may include instructions that cause an electronic device to perform a method according to an embodiment of the present disclosure described in the claims or specification of the present disclosure.

[0269] These programs (software modules and software) may be stored in RAM, non-volatile memory including flash memory, ROM, electrically erasable programmable ROM (EEPROM), magnetic disk storage devices, CD-ROM, DVD, other types of optical storage devices, or cassette tapes. The programs may be stored in a memory configured by a combination of some or all of such storage devices. In addition, each of the memories may be provided in plurality.

[0270] The program can be stored in an attachable storage device of an electronic device, which can be accessed via a communication network, such as the Internet, an intranet, a local area network (LAN), a wireless LAN (WLAN) or a storage area network (SAN) or a communication network combining these networks. The storage device can access the device that performs the embodiments of the present disclosure through an external port. In addition, a separate storage device in the communication network can access the device that performs the embodiments of the present disclosure.

[0271] In the present disclosure, the term "computer program product" or "computer-readable medium" may be used to generally refer to a memory, a hard disk installed in a hard disk drive, a signal, etc. The term "computer program product" or "computer-readable medium" may be a device for providing a method for configuring the transmission power of the SL synchronization channel and the SL feedback channel according to the present disclosure.

[0272] The disclosed embodiments of the present disclosure may provide an apparatus and method for effectively providing services in a wireless communication system.

[0273] In the embodiments of the present disclosure, according to the embodiments provided by the present disclosure, the components included in the present disclosure have been expressed as singular or plural. However, for the conditions provided for the convenience of description, singular or plural expressions have been appropriately selected, and the present disclosure is not limited to singular or plural components, and the components expressed as plural may be configured as a single component, or the components expressed as singular may also be configured as multiple components.

[0274] At the same time, the embodiments of the present disclosure disclosed in the specification and the drawings have been provided to easily describe the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is obvious to a person of ordinary skill in the art that other modifications can be made based on the technical spirit of the present disclosure. In addition, the embodiments of the present disclosure can be used in combination when necessary. For example, the embodiments of the present disclosure can be combined with some parts of another embodiment of the present disclosure. In addition, other modifications based on the technical spirit of the above-mentioned embodiments of the present disclosure can also be performed in other systems (e.g., LTE systems, 5G systems, NR systems, etc.).

[0275] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first terminal in a wireless communication system, the method comprising: receiving a priority value, the priority value being used to determine a simultaneous physical sidelink feedback channel PSFCH transmission for a plurality of data, the plurality of data being transmitted via a plurality of physical sidelink shared channels PSSCH; receiving the plurality of data transmitted through the plurality of PSSCHs from at least one other terminal; In a case where the number of at least one PSFCH transmissions corresponding to the plurality of PSSCH receptions is greater than the maximum number of simultaneous PSFCH transmissions, determining the number of simultaneous PSFCH transmissions to be equal to the maximum number of simultaneous PSFCH transmissions based on the priority value; and performing one or more PSFCH transmissions to the at least one other terminal based on the number of simultaneous PSFCH transmissions, The maximum number of simultaneous PSFCH transmissions is determined based on the capability of the first terminal and has different values ​​according to the capability of the first terminal.

2. The method according to claim 1, in, The number of simultaneous PSFCH transmissions is equal to or greater than one.

3. The method according to claim 1, further comprising: When the number of at least one PSFCH transmission corresponding to the multiple PSSCH receptions is equal to or less than the maximum number of simultaneous PSFCH transmissions, determine that the number of simultaneous PSFCH transmissions is equal to the number of at least one PSFCH transmission corresponding to the multiple PSSCH receptions.

4. The method according to claim 1, in, The performing one or more PSFCH transmissions to the at least one other terminal comprises: determining a transmission power of the one or more PSFCH transmissions based on at least one of a maximum output power, a downlink path loss value, and a scaling factor, wherein the downlink path loss value is determined based on a channel state between the at least one other terminal and the base station, and The scaling factor is determined based on a subcarrier spacing value for all of the one or more PSFCHs.

5. The method according to claim 1, further comprising: receiving a side link synchronization signal block S-SSB from the at least one other terminal or at least one other other terminal, The S-SSB includes a sidelink primary synchronization signal S-PSS, a sidelink secondary synchronization signal S-SSS, a physical sidelink broadcast channel PSBCH, and Among them, the transmission power of each of S-PSS, S-SSS and PSBCH is equal.

6. The method according to claim 5, in, The transmit power of the S-SSB is determined based on at least one scaling factor, and Wherein, the at least one scaling factor is determined based on a subcarrier spacing value for all of the S-PSS, S-SSS and PSBCH.

7. A first terminal in a wireless communication system, the first terminal comprising: Transceiver; and At least one processor configured to: receiving a priority value, the priority value being used to determine a simultaneous physical sidelink feedback channel PSFCH transmission for a plurality of data, the plurality of data being transmitted via a plurality of physical sidelink shared channels PSSCH; receiving, via the transceiver, the plurality of data transmitted through the plurality of PSSCHs from at least one other terminal; In a case where the number of at least one PSFCH transmissions corresponding to the plurality of PSSCH receptions is greater than the maximum number of simultaneous PSFCH transmissions, determining the number of simultaneous PSFCH transmissions to be equal to the maximum number of simultaneous PSFCH transmissions based on the priority value; and performing, via the transceiver, one or more PSFCH transmissions to the at least one other terminal based on the number of simultaneous PSFCH transmissions, The maximum number of simultaneous PSFCH transmissions is determined based on the capability of the first terminal and has different values ​​according to the capability of the first terminal.

8. The first terminal according to claim 7, in, The number of simultaneous PSFCH transmissions is equal to or greater than one.

9. The first terminal according to claim 7, wherein: The at least one processor is further configured to: In a case where the number of at least one PSFCH transmission corresponding to the multiple PSSCH receptions is equal to or less than the maximum number of simultaneous PSFCH transmissions, the number of simultaneous PSFCH transmissions corresponding to the multiple PSSCH receptions is determined.

10. The first terminal according to claim 7, in, The at least one processor is further configured to determine a transmit power for the one or more PSFCH transmissions based on at least one of a maximum output power, a downlink path loss value, and a scaling factor, wherein the downlink path loss value is determined based on a channel state between the at least one other terminal and the base station, and The scaling factor is determined based on a subcarrier spacing value for all of the one or more PSFCHs.

11. The first terminal according to claim 7, in, The at least one processor is further configured to: receiving a side link synchronization signal block S-SSB from the at least one other terminal or at least one other other terminal via the transceiver, The S-SSB includes a sidelink primary synchronization signal S-PSS, a sidelink secondary synchronization signal S-SSS, a physical sidelink broadcast channel PSBCH, and Among them, the transmission power of each of S-PSS, S-SSS and PSBCH is equal.

12. The first terminal according to claim 11, in, The transmit power of the S-SSB is determined based on at least one scaling factor, and Wherein, the at least one scaling factor is determined based on a subcarrier spacing value for all of the S-PSS, S-SSS and PSBCH.

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