Method and apparatus for configuring and transmitting synchronization signals for beam tracking and management in sidelink communications

Abstract

Methods and apparatus for configuring and transmitting synchronization signals for beam tracking and management in sidelink communications are disclosed. The method for a first UE comprises the steps of: transmitting one or more BM-S-SSBs to a second UE; and receiving the measured BSI from the second UE on the basis of the one or more BM-S-SSBs, where each of the one or more BM-S-SSBs includes an S-PSS and an S-SSS, without the need for a PSBCH.

Description

Technical Field

[0001] The present invention relates to a side link communication technology, and more particularly, to a technology for configuring and transmitting a synchronization signal for beam tracking and management. Background Art

[0002] Communication networks (e.g., 5G communication networks or 6G communication networks) are being developed to provide enhanced communication services compared to existing communication networks (e.g., long term evolution (LTE), LTE-Advanced, etc.). 5G communication networks (e.g., New Radio (NR) communication networks) can support frequency bands below 6 GHz and frequency bands above 6 GHz. In other words, 5G communication networks can support frequency region 1 (FR1) bands and / or FR2 bands. Compared with LTE communication networks, 5G communication networks can support various communication services and scenarios. For example, usage scenarios of 5G communication networks may include enhanced Mobile BroadBand (eMBB), UltraReliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared with 5G communication networks, 6G communication networks can support a wide variety of communication services and scenarios. 6G communication networks can meet the requirements of ultra-performance, ultra-bandwidth, ultra-space, ultra-precision, ultra-intelligence and / or ultra-reliability. 6G communication networks can support multiple broadband bands and can be applied to various usage scenarios, such as terrestrial communication, non-terrestrial communication, sidelink communication, etc.

[0004] On the other hand, beam tracking and / or beam management operations for sidelink communications may be required. Beam tracking / management operations may be performed based on channel state information-reference signals (CSI-RS). In addition, beam tracking / management operations utilizing sidelink-synchronization signal blocks (S-SSB) may be considered. In this case, S-SSB configuration and transmission methods for beam tracking / management operations may be required. Summary of the invention

[0005] Technical issues

[0006] The present invention is directed to providing a method and apparatus for configuring and transmitting a synchronization signal for beam tracking / management in sidelink communication.

[0007] Technical Solution

[0008] A method of a first user equipment (UE) for achieving the above-mentioned purpose according to an exemplary embodiment of the present invention may include: sending one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) to a second UE; and receiving beam state information (BSI) measured based on one or more BM-S-SSBs from the second UE, wherein each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

[0009] The method may further include: before sending one or more BM-S-SSBs, sending one or more Sync-S-SSBs to the second UE, wherein the one or more Sync-S-SSBs are used for synchronization between the first UE and the second UE, and each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

[0010] Each of the one or more BM-S-SSBs may further include a BM reference signal (RS), and the BM RS may be mapped to a transmission resource of the PSBCH in the time domain.

[0011] The BM RS may be mapped in the frequency domain to one or more subcarriers that do not overlap with a PSBCH demodulation reference signal (DMRS) included in a Sync-S-SSB transmitted by the first UE.

[0012] One or more subcarriers to which the BM RS is mapped in the frequency domain may be determined based on an offset with respect to a subcarrier to which the PSBCH DMRS is mapped.

[0013] The BM-S-SSB may further include one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs may be mapped to the transmission resources of the PSBCH in the time domain.

[0014] The method may further include: receiving synchronization configuration information including first configuration information of Sync-S-SSB and second configuration information of BM-S-SSB from the base station, wherein one or more Sync-S-SSBs may be sent based on the first configuration information, and one or more BM-S-SSBs may be sent based on the second configuration information.

[0015] One or more Sync-S-SSBs and one or more BM-S-SSBs may be independently configured, and transmission resources of the one or more Sync-S-SSBs may be different from transmission resources of the one or more BM-S-SSBs.

[0016] The method may further include maintaining or changing a beam used in SL communication between the first UE and the second UE based on the BSI.

[0017] One or more BM-S-SSBs may be transmitted based on a beam scanning scheme according to a beam pattern, and may be transmitted through different beams in units of n BM-S-SSBs, where n is a natural number.

[0018] According to an exemplary embodiment of the present invention, a method of a second user equipment (UE) for achieving the above-mentioned purpose may include: receiving one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) from a first UE; measuring beam information for the first UE based on one or more BM-S-SSBs; and sending beam state information (BSI) including beam information to the first UE, wherein each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

[0019] The method may further include: receiving one or more Sync-S-SSBs from the first UE before receiving one or more BM-S-SSBs; and obtaining synchronization information of the first UE based on the one or more Sync-S-SSBs, wherein each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

[0020] Each of the one or more BM-S-SSBs may further include a BM reference signal (RS), and the BM RS may be mapped to a transmission resource of the PSBCH in the time domain.

[0021] The BM RS may be mapped in the frequency domain to one or more subcarriers that do not overlap with a PSBCH demodulation reference signal (DMRS) included in a Sync-S-SSB received from the first UE.

[0022] The BM-S-SSB may further include one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs may be mapped to the transmission resources of the PSBCH in the time domain.

[0023] According to an exemplary embodiment of the present invention, a first user equipment (UE) for achieving the above-mentioned purpose may include at least one processor, wherein the at least one processor may enable the first UE to execute: sending one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) to a second UE; and receiving beam state information (BSI) measured based on one or more BM-S-SSBs from the second UE, wherein each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

[0024] At least one processor may further cause the first UE to perform: before sending one or more BM-S-SSBs, sending one or more Sync-S-SSBs to the second UE, wherein the one or more Sync-S-SSBs may be used for synchronization between the first UE and the second UE, and each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

[0025] Each of the one or more BM-S-SSBs may further include a BM reference signal (RS), and the BM RS may be mapped to a transmission resource of the PSBCH in the time domain.

[0026] The BM RS may be mapped in the frequency domain to one or more subcarriers that do not overlap with a PSBCH demodulation reference signal (DMRS) included in a Sync-S-SSB transmitted by the first UE.

[0027] The BM-S-SSB may further include one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs may be mapped to the transmission resources of the PSBCH in the time domain.

[0028] Beneficial Effects

[0029] According to the present invention, the transmitting terminal can send Sync-side link (S)-synchronization signal block (SSB) and beam management (BM)-S-SSB to the receiving terminal. Sync-S-SSB can be used for synchronization between the transmitting terminal and the receiving terminal, and BM-S-SSB can be used for beam management operations between the transmitting terminal and the receiving terminal. The receiving terminal can measure the beam information of the transmitting terminal based on the BM-S-SSB, and send the measurement result of the beam information to the transmitting terminal. The transmitting terminal can receive the measurement result of the beam information from the receiving terminal, and maintain or change the transmitting beam of the transmitting terminal based on the measurement result of the beam information. According to the above operations, the beam management operation in the SL communication can be appropriately performed, and the performance of the SL communication can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a conceptual diagram showing a scenario of vehicle-to-everything (V2X) communication.

[0031] Figure 2 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0032] Figure 3 is a conceptual diagram showing a first exemplary embodiment of a communication node constituting a communication system.

[0033] Figure 4 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0034] Figure 5a is a block diagram illustrating a first exemplary implementation of a transmit path.

[0035] Figure 5b is a block diagram illustrating a first exemplary implementation of a receive path.

[0036] Figure 6 is a block diagram illustrating a first exemplary implementation of a user plane protocol stack of a UE performing sidelink communications.

[0037] Figure 7 is a block diagram illustrating a first exemplary implementation of a control plane protocol stack of a UE performing sidelink communications.

[0038] Figure 8 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communications.

[0039] Fig. 9 is a conceptual diagram showing a first exemplary embodiment of S-SSB.

[0040] Fig.10 is a conceptual diagram illustrating a first exemplary embodiment of an S-SSB period.

[0041] Fig.11 is a conceptual diagram showing a first exemplary embodiment of the structure of a synchronization signal.

[0042] Fig.12 is a conceptual diagram showing a second exemplary embodiment of the structure of a synchronization signal.

[0043] Fig.13 is a conceptual diagram showing a third exemplary embodiment of the structure of a synchronization signal.

[0044] Fig.14 is a conceptual diagram showing a fourth exemplary embodiment of the structure of a synchronization signal.

[0045] Fig.15 is a conceptual diagram showing a fifth exemplary embodiment of the structure of a synchronization signal.

[0046] Fig.16 is a conceptual diagram showing a sixth exemplary embodiment of the structure of a synchronization signal.

[0047] Fig.17 is a conceptual diagram illustrating a first exemplary embodiment of a method for transmitting a synchronization signal.

[0048] Fig.18 is a conceptual diagram illustrating a second exemplary embodiment of a method for transmitting a synchronization signal.

[0049] Fig.19 is a conceptual diagram illustrating a third exemplary embodiment of a method for transmitting a synchronization signal.

[0050] Fig. 20 is a conceptual diagram illustrating a fourth exemplary embodiment of a method for transmitting a synchronization signal.

[0051] Fig.21 is a conceptual diagram illustrating a fifth exemplary embodiment of a method for transmitting a synchronization signal.

[0052] Fig. 22 is a conceptual diagram illustrating a sixth exemplary embodiment of a method for transmitting a synchronization signal.

[0053] Fig.23 is a conceptual diagram illustrating a seventh exemplary embodiment of a method for transmitting a synchronization signal.

[0054] Fig.24 is a conceptual diagram illustrating an eighth exemplary embodiment of a method for transmitting a synchronization signal.

[0055] Fig.25 is a sequence listing illustrating a first exemplary embodiment of a beam management method. DETAILED DESCRIPTION

[0056] Since the present invention can be variously modified and can have multiple forms, specific exemplary embodiments will be shown in the drawings and described in detail in the specific embodiments. However, it should be understood that it is not intended to limit the present invention to specific exemplary embodiments, but on the contrary, the present invention covers all modifications and alternative forms that fall within the spirit and scope of the present invention.

[0057] Relational terms such as first, second, etc. can be used to describe various elements, but these elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present invention, a first component can be named as a second component, and the second component can also be similarly named as the first component. The term "and / or" means any one or combination of multiple related and described matters.

[0058] In the present invention, "at least one of A and B" may mean "at least one of A or B" or "at least one of a combination of one or more of A and B". In addition, "one or more of A and B" may mean "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0059] In the present invention, "(re)transmission" may refer to "transmission", "retransmission" or "transmission and retransmission", "(re)configuration" may refer to "configuration", "reconfiguration" or "configuration and reconfiguration", "(re)connection" may refer to "connection", "reconnection" or "connection and reconnection", and "(re)access" may refer to "access", "reaccess" or "access and reaccess".

[0060] When it is mentioned that a certain component is "coupled" or "connected" to another component, it should be understood that the certain component is directly "coupled" or "connected" to the other component, or another component may be provided therebetween. On the contrary, when it is mentioned that a certain component is "directly coupled" or "directly connected" to another component, it should be understood that no other component is provided therebetween.

[0061] The terms used in the present invention are only used to describe specific exemplary embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "including" or "having" are intended to indicate the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that these terms do not exclude the presence or addition of one or more features, quantities, steps, operations, components, parts, or combinations thereof.

[0062] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those generally understood by those of ordinary skill in the art to which the present invention belongs. Terms commonly used in dictionaries and already in dictionaries should be interpreted as having meanings that match the contextual meanings in the art. In this specification, unless explicitly defined, terms are not necessarily interpreted as having formal meanings.

[0063] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate a comprehensive understanding of the present invention, the same reference numerals refer to the same elements in the description of the entire accompanying drawings, and repeated descriptions thereof will be omitted. Operations of the exemplary embodiments clearly described in the present invention and combinations of the exemplary embodiments, expansions of the exemplary embodiments, and / or variants of the exemplary implementations may be performed. Some operations may be omitted, and the sequence of operations may be changed.

[0064] Even when a method (e.g., transmission or reception of a signal) performed at a first communication node among communication nodes is described in an exemplary embodiment, a corresponding second communication node may perform a method (e.g., reception or transmission of a signal) corresponding to the method performed at the first communication node. That is, when the operation of a user equipment (UE) is described, a base station corresponding thereto may perform an operation corresponding to the operation of the UE. Conversely, when the operation of a base station is described, a corresponding UE may perform an operation corresponding to the operation of the base station.

[0065] A base station may be referred to by various terms, such as node B, evolved node B, next generation node B (gNodeB), gNB, equipment, device, node, communication node, base transceiver station (BTS), radio remote head (RRH), transmission reception point (TRP), radio unit (RU), roadside unit (RSU), radio transceiver, access point, access node, etc. User equipment (UE) may be referred to by various terms, such as terminal, equipment, device, node, communication node, end node, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, on-board unit (OBU), etc.

[0066] In the present invention, signaling may be one, or a combination of two or more of higher layer signaling, MAC signaling, and physical (PHY) signaling. A message for higher layer signaling may be referred to as a "higher layer message" or a "higher layer signaling message". A message for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message". A message for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message". Higher layer signaling may refer to the operation of sending and receiving system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to the operation of sending and receiving a MAC control element (CE). PHY signaling may refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI), or sidelink control information (SCI)).

[0067] In the present invention, "configuration of an operation (e.g., sending an operation)" may refer to configuration information (e.g., information element, parameter) required for the operation and / or signaling of information indicating the execution of the operation. "Configuration of an information element (e.g., parameter)" may refer to signaling of an information element. In the present invention, "signal and / or channel" may refer to a signal, a channel, or both a signal and a channel, and "signal" may be used to mean "signal and / or channel".

[0068] The communication network to which the exemplary embodiment is applied is not limited to the communication network described below, and the exemplary embodiment can be applied to various communication networks (e.g., 4G communication network, 5G communication network and / or 6G communication network). Here, "communication network" can be used interchangeably with the term "communication system".

[0069] Figure 1 It is a conceptual diagram showing a scenario of vehicle-to-everything (V2X) communication.

[0070] like Figure 1As shown, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication may be supported by a communication system (e.g., a communication network) 140, and V2X communication supported by the communication system 140 may be referred to as "cellular-V2X (C-V2X) communication". Here, the communication system 140 may include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0071] V2V communication may include communication between a first vehicle 100 (e.g., a communication node located in the vehicle 100) and a second vehicle 110 (e.g., a communication node located in the vehicle 110). Various driving information such as speed, heading, time, location, etc. may be exchanged between the vehicle 100 and the vehicle 110 through V2V communication. For example, autonomous driving (e.g., platoon driving) may be supported based on the driving information exchanged through V2V communication. V2V communication supported by the communication system 140 may be performed based on a sidelink communication technology (e.g., based on Proximity Based Services (ProSe) and Device-to-Device (D2D) communication technology, etc.). In this case, communication between the vehicle 100 and the vehicle 110 may be performed using at least one sidelink channel.

[0072] V2I communication may include communication between the first vehicle 100 and an infrastructure (e.g., a roadside unit (RSU)) 120 located on the roadside. The infrastructure 120 may include a traffic light or a street light located on the roadside. For example, when performing V2I communication, communication may be performed between a communication node located in the first vehicle 100 and a communication node located in a traffic light. Traffic information, driving information, and the like may be exchanged between the first vehicle 100 and the infrastructure 120 through V2I communication. V2I communication supported by the communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the vehicle 100 and the infrastructure 120 may be performed using at least one sidelink channel.

[0073] V2P communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and the person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and movement information of the person 130, such as speed, forward direction, time, location, etc., may be exchanged between the vehicle 100 and the person 130 through V2P communication. By judging a dangerous situation based on the obtained driving information and movement information, the communication node located in the vehicle 100 or the communication node carried by the person 130 may generate an alarm indicating the danger. V2P communication supported by the communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the communication node located in the vehicle 100 and the communication node carried by the person 130 may be performed using at least one sidelink channel.

[0074] V2N communication may be communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and a communication system (e.g., a communication network) 140. V2N communication may be performed based on 4G communication technology (e.g., LTE or LTE-A as described in the 3GPP standard) or 5G communication technology (e.g., NR as described in the 3GPP standard). In addition, V2N communication may be performed based on Wireless Access in Vehicular Environments (WAVE) communication technology or Wireless Local Area Network (WLAN) communication technology defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11, Wireless Personal Area Network (WPAN) communication technology defined in IEEE 802.15, and the like.

[0075] On the other hand, the communication system 140 supporting V2X communication may be configured as follows.

[0076] Figure 2 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0077] like Figure 2 As shown, the communication system may include an access network, a core network, etc. The access network may include a base station 210, a relay station 220, user equipments (UEs) 231 to 236, etc. UEs 231 to 236 may include a Figure 1 The communication nodes in the vehicle 100 and the vehicle 110 are located Figure 1The communication nodes in the infrastructure 120 are Figure 1 When the communication system supports 4G communication technology, the core network may include a serving gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, and the like.

[0078] When the communication system supports 5G communication technology, the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, etc. Alternatively, when the communication system operates in a non-standalone (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 may support 5G communication technology as well as 4G communication technology, and the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support 4G communication technology as well as 5G communication technology.

[0079] In addition, when the communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, a network slice supporting V2X communication (e.g., V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.) can be configured, and V2X communication can be supported by the V2X network slice configured in the core network.

[0080] The communication nodes constituting the communication system (e.g., base stations, relay stations, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) can perform communication by utilizing at least one of the following communication technologies: code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiplexing (OFDM) technology, filtered OFDM technology, orthogonal frequency division multiple access (OFDMA) technology, single carrier FDMA (SC-FDMA) technology, non-orthogonal multiple access (NOMA) technology, generalized frequency division multiplexing (GFDM) technology, filter bank multi-carrier (FBMC) technology, universal filtered multi-carrier (UFMC) technology, and space division multiple access (SDMA) technology. access, SDMA) technology.

[0081] The communication nodes constituting the communication system (e.g., base stations, relay stations, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) may be configured as follows.

[0082] Figure 3 is a conceptual diagram showing a first exemplary embodiment of a communication node constituting a communication system.

[0083] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network for performing communication. In addition, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can communicate with each other when connected through a bus 370.

[0084] However, each component included in the communication node 300 may be connected to the processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transceiver 330, the input interface device 340, the output interface device 350, and the storage device 360 ​​via a dedicated interface.

[0085] The processor 310 may execute at least one program instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to the exemplary embodiment of the present invention is executed. Each of the memory 320 and the storage device 360 ​​may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0086] Reference again Figure 2 In the communication system, the base station 210 may form a macro cell or a small cell and may be connected to the core network via an ideal backhaul or a non-ideal backhaul. The base station 210 may send a signal received from the core network to UE 231 to UE 236 and the relay station 220, and may send a signal received from UE 231 to UE 236 and the relay station 220 to the core network. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may belong to the cell coverage of the base station 210. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may be connected to the base station 210 by performing a connection establishment process with the base station 210. UE#1 231 , UE#2 232 , UE#4 234 , UE#5 235 , and UE#6 236 may communicate with the base station 210 after being connected to the base station 210 .

[0087] The relay station 220 may be connected to the base station 210, and may relay communication between the base station 210 and UE#3 233 and UE#4 234. That is, the relay station 220 may transmit a signal received from the base station 210 to the UE#3 233 and UE#4 234, and may transmit a signal received from the UE#3 233 and UE#4 234 to the base station 210. The UE#4 234 may belong to both the cell coverage of the base station 210 and the cell coverage of the relay station 220, and the UE#3 233 may belong to the cell coverage of the relay station 220. That is, the UE#3 233 may be located outside the cell coverage of the base station 210. The UE#3 233 and UE#4 234 may be connected to the relay station 220 by performing a connection establishment procedure with the relay station 220. The UE#3 233 and UE#4 234 may communicate with the relay station 220 after being connected to the relay station 220.

[0088] The base station 210 and the relay station 220 may support multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) communication technology, carrier aggregation (CA) communication technology, unlicensed band communication technology (e.g., Licensed Assisted Access (LAA), enhanced LAA (eLAA), etc.), side link communication technology (e.g., ProSe communication technology, D2D communication technology), etc. UE#1 231, UE#2 232, UE#5 235, and UE#6 236 may perform operations corresponding to the base station 210 and operations supported by the base station 210. UE#3 233 and UE#4 234 may perform operations corresponding to the relay station 220 and operations supported by the relay station 220.

[0089] Here, the base station 210 may refer to a Node B (NB), an evolved Node B (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmit receive point (TRP), a radio unit (RU), a road side unit (RSU), a radio transceiver, an access point, an access node, etc. The relay station 220 may refer to a small base station, a relay node, etc. Each of the UEs 231 to 236 may refer to a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, an on-board unit (OBU), etc.

[0090] On the other hand, a communication node that performs communication in a communication network may be configured as follows. Figure 4 The communication nodes shown may be Figure 3 A specific exemplary embodiment of a communication node is shown.

[0091] Figure 4 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0092] like Figure 4 As shown, each of the first communication node 400a and the second communication node 400b can be a base station or a UE. The first communication node 400a can send a signal to the second communication node 400b. The transmission processor 411 included in the first communication node 400a can receive data (e.g., data unit) from the data source 410. The transmission processor 411 can receive control information from the controller 416. The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE) or PHY control information (e.g., DCI, SCI).

[0093] The transmit processor 411 may generate data symbols by performing processing operations on data (e.g., encoding operations, symbol mapping operations, etc.). The transmit processor 411 may generate control symbols by performing processing operations on control information (e.g., encoding operations, symbol mapping operations, etc.). In addition, the transmit processor 411 may generate synchronization / reference symbols for synchronization signals and / or reference signals.

[0094] The Tx MIMO processor 412 may perform spatial processing operations (e.g., precoding operations) on data symbols, control symbols, and / or synchronization / reference symbols. The output (e.g., symbol stream) of the Tx MIMO processor 412 may be provided to a modulator (MOD) included in the transceiver 413a to the transceiver 413t. The modulator may generate modulation symbols by performing processing operations on the symbol stream, and may generate signals by performing additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations, etc.) on the modulation symbols. The signals generated by the modulators of the transceivers 413a to the transceivers 413t may be transmitted through the antennas 414a to the antennas 414t.

[0095] The signal transmitted by the first communication node 400a may be received at the antenna 464a to the antenna 464r of the second communication node 400b. The signal received at the antenna 464a to the antenna 464r may be provided to a demodulator (DEMOD) included in the transceiver 463a to the transceiver 463r. The demodulator (DEMOD) may obtain samples by performing processing operations (e.g., filtering operations, amplification operations, down-conversion operations, digital conversion operations, etc.) on the signal. The demodulator may perform additional processing operations on the samples to obtain symbols. The MIMO detector 462 may perform MIMO detection operations on the symbols. The receiving processor 461 may perform processing operations (e.g., deinterleaving operations, decoding operations, etc.) on the symbols. The output of the receiving processor 461 may be provided to the data sink. 460 and controller 466. For example, data may be provided to data sink 460, and control information may be provided to controller 466.

[0096] On the other hand, the second communication node 400b can send a signal to the first communication node 400a. The transmission processor 469 included in the second communication node 400b can receive data (e.g., data unit) from the data source 467, and perform processing operations on the data to generate data symbols. The transmission processor 468 can receive control information from the controller 466, and perform processing operations on the control information to generate control symbols. In addition, the transmission processor 468 can generate reference symbols by performing processing operations on reference signals.

[0097] The Tx MIMO processor 469 may perform spatial processing operations (e.g., precoding operations) on data symbols, control symbols, and / or reference symbols. The output (e.g., symbol stream) of the Tx MIMO processor 469 may be provided to a modulator (MOD) included in the transceiver 463a to the transceiver 463t. The modulator may generate modulation symbols by performing processing operations on the symbol stream, and may generate signals by performing additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations) on the modulation symbols. The signals generated by the modulators of the transceivers 463a to the transceivers 463t may be transmitted via the antennas 464a to the antennas 464t.

[0098] The signal transmitted by the second communication node 400b can be received at the antenna 414a to the antenna 414r of the first communication node 400a. The signal received at the antenna 414a to the antenna 414r can be provided to the demodulator (DEMOD) included in the transceiver 413a to the transceiver 413r. The demodulator can obtain samples by performing processing operations (e.g., filtering operations, amplification operations, down-conversion operations, digital conversion operations) on the signal. The demodulator can perform additional processing operations on the samples to obtain symbols. The MIMO detector 420 can perform MIMO detection operations on the symbols. The receiving processor 419 can perform processing operations (e.g., deinterleaving operations, decoding operations, etc.) on the symbols. The output of the receiving processor 419 can be provided to the data sink 418 and the controller 416. For example, data can be provided to the data sink 418, and control information can be provided to the controller 416.

[0099] Memory 415 and storage 465 may store data, control information and / or program codes. Scheduler 417 may perform scheduling operations for communications. Figure 4 The processors 411, 412, 419, 461, 468, 469 and the controllers 416 and 466 shown may be Figure 3 The processor 310 shown may be used to execute the methods described in the present invention.

[0100] Figure 5a is a block diagram illustrating a first exemplary embodiment of a transmit path, Figure 5b is a block diagram illustrating a first exemplary implementation of a receive path.

[0101] like Figure 5a and Figure 5bAs shown, the transmission path 510 can be implemented in a communication node that transmits a signal, and the reception path 520 can be implemented in a communication node that receives a signal. The transmission path 510 may include a channel coding and modulation block 511, a serial-to-parallel (S to P) block 512, an N-point inverse fast Fourier transform (N-point IFFT) block 513, a parallel-to-serial (P to S) block 514, a cyclic prefix (CP) adding block 515, and an up-converter (UC) 516. The reception path 520 may include a down-converter (DC) 521, a CP deletion block 522, an S to P block 523, an N-point FFT block 524, a P to S block 525, and a channel decoding and demodulation block 526. Here, N may be a natural number.

[0102] In the transmission path 510, the information bits may be input to the channel coding and modulation block 511. The channel coding and modulation block 511 may perform coding and decoding operations (e.g., low-density parity check (LDPC) coding and decoding operations, polar coding and decoding operations, etc.) and modulation operations (e.g., quadrature phase shift keying (OPSK), quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block 511 may be a modulation symbol sequence.

[0103] The S to P block 512 may convert the frequency domain modulation symbols into parallel symbol streams to generate N parallel symbol streams. N may be an IFFT size or an FFT size. The N-point IFFT block 513 may generate a time domain signal by performing an IFFT operation on the N parallel symbol streams. The P to S block 514 may convert the output (e.g., parallel signals) of the N-point IFFT block 513 into a serial signal to generate a serial signal.

[0104] The CP adding block 515 may insert a CP into the signal. The UC 516 may up-convert the frequency of the output of the CP adding block 515 to a radio frequency (RF) frequency. In addition, the output of the CP adding block 515 may be filtered in baseband before up-conversion.

[0105] The signal transmitted from the transmission path 510 may be input to the reception path 520. The operation in the reception path 520 may be the reverse operation of the operation in the transmission path 510. The DC 521 may down-convert the frequency of the received signal to the baseband frequency. The CP removal block 522 may remove the CP from the signal. The output of the CP removal block 522 may be a serial signal. The S to P block 523 may convert the serial signal into a parallel signal. The N-point FFT block 524 may generate N parallel signals by performing an FFT algorithm. The P to S block 525 may convert the parallel signal into a modulation symbol sequence. The channel decoding and demodulation block 526 may perform a demodulation operation on the modulation symbol, and may recover the data by performing a decoding operation on the result of the demodulation operation.

[0106] exist Figure 5a and Figure 5b In the present invention, discrete Fourier transform (DFT) and inverse DFT (IDFT) can be used to replace FFT and IFFT. Figure 5a and Figure 5b Each of the blocks (eg, components) in the embodiment may be implemented by at least one of hardware, software, or firmware. Figure 5a and Figure 5b Some blocks in the can be implemented by software, and other blocks can be implemented by hardware or a combination of hardware and software. Figure 5a and Figure 5b In the , a block can be subdivided into multiple blocks, multiple blocks can be integrated into one block, some blocks can be omitted, and blocks that support other functions can be added.

[0107] On the other hand, the communication between UE#5 235 and UE#6 236 may be performed based on a sidelink communication technology (e.g., ProSe communication technology, D2D communication technology). The sidelink communication may be performed based on a one-to-one scheme or a one-to-many scheme. When V2V communication is performed using the sidelink communication technology, UE#5 235 may refer to a UE located at Figure 1 The communication node in the first vehicle 100, and UE#6 236 may refer to a communication node located at Figure 1 When V2I communication is performed using the sidelink communication technology, UE#5 235 may refer to a communication node located in the second vehicle 110. Figure 1 The communication node in the first vehicle 100, and UE#6236 may refer to a communication node located at Figure 1 When V2P communication is performed using the sidelink communication technology, UE#5 235 may refer to a communication node located in Figure 1The communication node in the first vehicle 100, and UE#6 236 may refer to a communication node carried by the person 130.

[0108] The scenarios in which the side link communication is applied can be classified according to the locations of the UEs (e.g., UE#5 235 and UE#6 236) participating in the side link communication, as shown in Table 1 below. For example, Figure 2 The scenario of sidelink communication between UE#5 235 and UE#6 236 shown may be sidelink communication scenario #C.

[0109] [Table 1]

[0110] Sidelink communication scenario UE#5 235 location UE#6 236 location #A Outside the coverage of base station 210 Outside the coverage of base station 210 #B Within the coverage area of ​​base station 210 Outside the coverage of base station 210 #C Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210 #D Within the coverage area of ​​base station 210 In the coverage area of ​​other base stations

[0111] On the other hand, the user plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0112] Figure 6 is a block diagram illustrating a first exemplary implementation of a user plane protocol stack of a UE performing sidelink communications.

[0113] like Figure 6 As shown, UE#5 235 can be Figure 2 UE#5 235 is shown, and UE#6 236 may be Figure 2 UE#6 236 is shown. The scenario of the sidelink communication between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack of each of UE#5 235 and UE#6 236 can include a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer.

[0114] A PC5 interface (e.g., PC5-U interface) may be used to perform sidelink communication between UE#5 235 and UE#6 236. A layer 2 identifier (ID) (e.g., source layer 2 ID, destination layer 2 ID) may be used for sidelink communication, and the layer 2 ID may be an ID configured for V2X communication. In addition, in the sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation may be supported, and an RLC acknowledged mode (AM) or an RLC unacknowledged mode (UM) may be supported.

[0115] On the other hand, the control plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0116] Figure 7 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communications, Figure 8 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communications.

[0117] like Figure 7 and Figure 8 As shown, UE#5 235 can be Figure 2 UE#5 235 is shown, and UE#6 236 may be Figure 2 UE#6 236 is shown. The scenario of the side link communication between UE#5 235 and UE#6 236 can be one of the side link communication scenarios #A to #D in Table 1. Figure 7 The control plane protocol stack shown may be a control plane protocol stack for sending and receiving broadcast information (eg, Physical Sidelink Broadcast Channel (PSBCH)).

[0118] Figure 7 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer. A sidelink communication between UE#5 235 and UE#6 236 may be performed using a PC5 interface (eg, PC5-C interface). Figure 8 The control plane protocol stack shown may be a control plane protocol stack for one-to-one sidelink communications. Figure 8 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0119] On the other hand, channels utilized in the sidelink communication between UE#5 235 and UE#6 236 may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). PSSCH may be used to transmit and receive sidelink data and may be configured in a UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling. PSCCH may be used to transmit and receive sidelink control information (SCI) and may also be configured in a UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling.

[0120] PSDCH can be used for discovery process. For example, discovery signal can be transmitted via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). In addition, demodulation reference signal (DMRS), synchronization signal, etc. can be used in sidelink communication between UE#5 235 and UE#6 236. The synchronization signal can include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

[0121] On the other hand, the side link transmission mode (TM) can be divided into side links TM#1 to TM#4, as shown in Table 2 below.

[0122] [Table 2]

[0123] SidelinkTM illustrate #1 Transmission using resources scheduled by the base station #2 UE automatic transmission without base station scheduling #3 Transmission using resources scheduled by a base station in V2X communications #4 UE automatic transmission without base station scheduling in V2X communication

[0124] When supporting sidelink TM#3 or TM#4, each of UE#5 235 and UE#6 236 may perform sidelink communication using a resource pool configured by base station 210. A resource pool may be configured for each of sidelink control information and sidelink data.

[0125] A resource pool for side link control information may be configured based on an RRC signaling process (e.g., a dedicated RRC signaling process, a broadcast RRC signaling process). A resource pool for receiving side link control information may be configured by a broadcast RRC signaling process. When side link TM#3 is supported, a resource pool for transmitting side link control information may be configured by a dedicated RRC signaling process. In this case, the side link control information may be transmitted via resources scheduled by the base station 210 within a resource pool configured by a dedicated RRC signaling process. When side link TM#4 is supported, a resource pool for transmitting side link control information may be configured by a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the side link control information may be transmitted via resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within a resource pool configured by a dedicated RRC signaling process or a broadcast RRC signaling process.

[0126] When side link TM#3 is supported, a resource pool for sending and receiving side link data may not be configured. In this case, the side link data may be sent and received through resources scheduled by the base station 210. When side link TM#4 is supported, a resource pool for sending and receiving side link data may be configured through a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the side link data may be sent and received via resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within a resource pool configured through a dedicated RRC signaling process or a broadcast RRC signaling process.

[0127] In the following, the side link communication method will be described. Even when describing a method performed at a first communication node in a communication node (e.g., sending or receiving a signal), the corresponding second communication node may also perform a method corresponding to the method performed at the first communication node (e.g., receiving or sending a signal). That is, when describing the operation of UE#1 (e.g., vehicle #1), the corresponding UE#2 (e.g., vehicle #2) may perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 may perform an operation corresponding to the operation of UE#2. In the exemplary embodiment described below, the operation of the vehicle may be the operation of a communication node located in the vehicle.

[0128] The sidelink signal may be a synchronization signal and a reference signal for sidelink communication. For example, the synchronization signal may be a synchronization signal / physical broadcast channel (SS / PBCH) block, a sidelink synchronization signal (SLSS), a primary sidelink synchronization signal (PSSS), a secondary sidelink synchronization signal (SSSS), etc. The reference signal may be a channel state information-reference signal (CSI-RS), a DM-RS, a phase tracking-reference signal (PT-RS), a cell specific reference signal (CRS), a sounding reference signal (SRS), a discovery reference signal (DRS), etc.

[0129] The sidelink channel may be a PSSCH, a PSCCH, a PSDCH, a PSBCH, a physical sidelink feedback channel (PSFCH), etc. In addition, a sidelink channel may refer to a sidelink channel including a sidelink signal mapped to a specific resource in a corresponding sidelink channel. Sidelink communications may support broadcast services, multicast services, groupcast services, and unicast services.

[0130] The base station may send system information (e.g., SIB12, SIB13, SIB14) and an RRC message including configuration information for sidelink communication (i.e., sidelink configuration information) to the UE. The UE may receive the system information and the RRC message from the base station, identify the sidelink configuration information included in the system information and the RRC message, and perform sidelink communication based on the sidelink configuration message. SIB12 may include sidelink communication / discovery configuration information. SIB13 and SIB14 may include configuration information for V2X sidelink communication.

[0131] Sidelink communications may be performed within a SL bandwidth part (BWP). The base station may configure the SL BWP to the UE using higher layer signaling. The higher layer signaling may include SL-BWP-Config and / or SL-BWP-ConfigCommon. SL-BWP-Config may be used to configure the SL BWP for UE-specific sidelink communications. SL-BWP-ConfigCommon may be used to configure cell-specific configuration information.

[0132] In addition, the base station may configure a resource pool to the UE using higher layer signaling. The higher layer signaling may include SL-BWP-PoolConfig, SL-BWP-PoolConfigCommon, SL-BWP-DiscPoolConfig and / or SL-BWP-DiscPoolConfigCommon. SL-BWP-PoolConfig may be used to configure a sidelink communication resource pool. SL-BWP-PoolConfigCommon may be used to configure a cell-specific sidelink communication resource pool. SL-BWP-DiscPoolConfig may be used to configure a resource pool dedicated to UE-specific sidelink discovery. SL-BWP-DiscPoolConfigCommon may be used to configure a resource pool dedicated to cell-specific sidelink discovery. The UE may perform sidelink communication within a resource pool configured by the base station.

[0133] Sidelink communication may support SL discontinuous reception (DRX) operation. The base station may send a higher layer message (e.g., SL-DRX-Config) including parameters related to SL DRX to the UE. The UE may perform SL DRX operation based on the SL-DRX-Config received from the base station. Sidelink communication may support inter-UE coordination operation. The base station may send a higher layer message (e.g., SL-InterUE-CoordinationConfig) including inter-UE coordination parameters to the UE. The UE may perform inter-UE coordination operation based on the SL-InterUE-CoordinationConfig received from the base station.

[0134] The side link communication may be performed based on a single SCI scheme or a multi-SCI scheme. When a single SCI scheme is used, the side link communication may be performed based on one SCI (e.g., the first-stage SCI (1 st -stage SCI)) to perform data transmission (e.g., sidelink data transmission, sidelink shared channel (SL-SCH) transmission). When a multi-SCI scheme is used, two SCIs (e.g., first-stage SCI and second-stage SCI (2 nd-stage SCI)) to perform data transmission. SCI can be transmitted on PSCCH and / or PSSCH. When a single SCI scheme is utilized, SCI (e.g., first-stage SCI) can be transmitted on PSCCH. When a multi-SCI scheme is utilized, first-stage SCI can be transmitted on PSCCH, and second-stage SCI can be transmitted on PSCCH or PSSCH. The first-stage SCI can be referred to as "first-stage SCI (first-stage SCI)", and the second-stage SCI can be referred to as "second-stage SCI (second-stage SCI)". The format of the first-stage SCI may include SCI format 1-A, and the format of the second-stage SCI may include SCI format 2-A, SCI format 2-B, and SCI format 2-C.

[0135] SCI format 1-A can be used to schedule PSSCH and second-stage SCI. SCI format 1-A may include priority information, frequency resource allocation information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) mode information, second-stage SCI format information, beta_offset indicator, number of DMRS ports, modulation and coding scheme (MCS) information, additional MCS table indicator, PSFCH overhead indicator, or at least one of a conflict information receiver flag.

[0136] SCI format 2-A may be used for decoding of PSSCH. SCI format 2-A may include at least one of a HARQ processor number, a new data indicator (NDI), a redundancy version (RV), a source ID, a destination ID, a HARQ feedback enable / disable indicator, a cast type indicator, or a CSI request.

[0137] SCI format 2-B may be used for decoding of PSSCH. SCI format 2-B may include at least one of the number of HARQ processors, NDI, RV, source ID, destination ID, HARQ feedback enable / disable indicator, zone ID, or communication range requirement.

[0138] SCI format 2-C may be used for decoding of PSSCH. In addition, SCI format 2-C may be used to provide or request inter-UE coordination information. SCI format 2-C may include at least one of the number of HARQ processors, NDI, RV, source ID, destination ID, HARQ feedback enable / disable indicator, CSI request, or provide / request indicator.

[0139] When the value of the provide / request indicator is set to 0, this may indicate that SCI format 2-C is used to provide inter-UE coordination information. In this case, SCI format 2-C may include at least one of a resource combination, a first resource position, a reference time slot position, a resource set type, or a lowest subchannel index.

[0140] When the value of the offer / request indicator is set to 1, this may indicate that the SCI format 2-C is used to request inter-UE coordination information. In this case, the SCI format 2-C may include at least one of a priority, a number of subchannels, a resource reservation period, a resource selection window position, a resource set type, or a padding bit.

[0141] On the other hand, side link (SL) communication may support beam management operations. Beam management operations may be supported in the FR2 band. In the present invention, beam management operations may refer to operations including beam tracking operations. Beam management operations may be performed based on at least one of aperiodic channel state information (CSI) report, a periodic CSI report, or a semi-persistent CSI report. SCI (e.g., SCI format 2-A and / or 2-C) may include a CSI request field, and beam management operations may be performed based on aperiodic CSI reports triggered by SCI.

[0142] The first terminal may transmit a CSI-RS (e.g., a CSI-RS for beam management) in each symbol belonging to the SL time slot. The first terminal may transmit the CSI-RS based on a beam scanning operation. In other words, the first terminal may transmit the CSI-RS using different beams (e.g., different transmit beams) in each symbol belonging to the SL time slot. The second terminal may receive the CSI-RS from the first terminal. A reception operation for the CSI-RS may be performed based on the beam scanning operation. For example, the second terminal may perform a reception operation for the CSI-RS using different beams (e.g., different receive beams). If transmission and reception operations of the CSI-RS (e.g., a reference signal) are performed based on a beam scanning operation, resources for transmission and reception of the CSI-RS may be insufficient.

[0143] When resources are allocated for beam scanning operations of reference signals, symbols (e.g., PSSCH symbols) for SL data transmission may be insufficient. Therefore, beam management operations based on signals other than reference signals (e.g., synchronization signals) may be required in SL communication.

[0144] The beam management operations in the NR Uu link can be defined as follows.

[0145] ■Signals used for CSI measurement: CSI-RS set and / or synchronization signal block (SSB)

[0146] ■Channel quality indicator (CQI) metric for beam: L1 - reference signal received power (RSRP)

[0147] ■ Maximum number of CSIs that can be reported per terminal: 4 (e.g. CSI reporting for 4 beams is possible)

[0148] ■ Report information: the maximum L1-RSRP among the L1-RSRPs of a beam and / or the difference between the maximum L1-RSRP and the L1-RSRPs of the remaining beams

[0149] ■CSI-RS transmission type: CSI report type + channel used for CSI reporting

[0150] -Periodic type: periodic CSI report + physical uplink control channel (PUCCH)

[0151] - Semi-persistent type: periodic CSI report + PUCCH or semi-persistent CSI report + physical uplink shared channel (PUSCH)

[0152] - Aperiodic type: Aperiodic CSI report (e.g., aperiodic CSI report triggered by DCI with CSI request field) + PUSCH

[0153] ■ Beam adjustment for each of a downlink transmission beam and a reception beam may be performed. If beam reciprocity is established between an uplink and a downlink, a beam management operation (eg, a beam adjustment operation) may be performed only for the downlink.

[0154] The CSI related operations in the NR SL link can be defined as follows.

[0155] ■Signal used for CSI measurement: CSI-RS set

[0156] ■CQI metric: L1-RSRP

[0157] ■Maximum CSI-RS ports: 2

[0158] ■CSI-RS transmission type: CSI report type + channel used for CSI reporting

[0159] - Aperiodic type: Aperiodic CSI report (e.g., aperiodic CSI report triggered by SCI format 2-A or 2-C with CSI request field) + PSSCH (e.g., MAC CE)

[0160] The following sidelink-synchronization signal block (S-SSB) related operations in NR communication can be defined.

[0161] ■ Unlike SSB transmission in NR Uu link, S-SSB transmission in NR SL link can be performed with a fixed period. The fixed period can be 160ms.

[0162] ■As shown in Table 3 below, depending on the frequency range (FR) and / or subcarrier spacing (SCS), it is possible to transmit multiple S-SSBs within one S-SSB period.

[0163] [Table 3]

[0164]

[0165] In SL communication, S-SSB can be used for beam management (e.g., beam quality measurement) of beams (e.g., transmit beams and / or receive beams) between a transmitting terminal and a receiving terminal. In other words, S-SSB can be used to perform beam management operations.

[0166] In the present invention, a terminal that sends an S-SSB for beam information measurement may be referred to as a transmitting terminal (or a first terminal), and a terminal that receives an S-SSB may be referred to as a receiving terminal (or a second terminal). The receiving terminal may obtain (e.g., measure) beam information based on the S-SSB, and may report the beam information to the transmitting terminal when necessary. The beam information may be information about a transmitting beam of a transmitting terminal and / or information about a receiving beam of a receiving terminal. The beam information measured by the receiving terminal may be defined as beam state information (BSI). For example, the BSI may include an index of a specific beam, beam quality information (e.g., RSRP, reference signal received quality (RSRQ), received signal strength indicator (RSSI), etc.) and / or calculation results for beam quality measurement values ​​(e.g., RSRP, RSRQ, RSSI, etc.).

[0167] Fig. 9 is a conceptual diagram showing a first exemplary embodiment of S-SSB.

[0168] like Fig. 9 As shown, the S-SSB may include a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS) and a PSBCH. The S-SSB may further include a PSBCH DMRS. The PSBCH DMRS may be a DMRS for demodulation of the PSBCH. The S-SSB may be transmitted in a single time slot. Fig. 9 In the S-SSB shown in FIG. 1 , a normal cyclic prefix (CP) may be applied. In the present invention, a normal cyclic prefix (CP) may be applied. Fig. 9 The S-SSB shown, from Fig. 9 The variant S-SSB shown is S-SSB from Fig. 9 The extended S-SSB shown and / or from Fig. 9 The combination of S-SSB shown is S-SSB.

[0169] Fig.10 is a conceptual diagram illustrating a first exemplary embodiment of an S-SSB period.

[0170] like Fig.10 As shown, one or more S-SSBs may be transmitted within an S-SSB period. The period of the S-SSB period may be 160ms. The period of the S-SSB period may be a fixed period. The time offset from the start time of the S-SSB period to the transmission time of the first S-SSB and / or the time interval between S-SSBs may be configured to the terminal through signaling. The terminal may transmit the S-SSB in various ways based on the time offset and / or the time interval. In the present invention, the S-SSB may be transmitted in a fixed period. Fig.10 The S-SSB period shown, from Fig.10 The variant S-SSB period shown is from Fig.10 The extended S-SSB period of the S-SSB period shown and / or from Fig.10 The combined S-SSB period of the S-SSB period shown.

[0171] Fig.11 is a conceptual diagram showing a first exemplary embodiment of the structure of a synchronization signal.

[0172] like Fig.11 As shown, the resources (e.g., resource segments, resource regions) used for PSBCH transmission may be symbols #1 to #9. Nine symbols (e.g., symbols #1 to #9) within a time slot (e.g., a time slot in which a synchronization signal is transmitted) may be used for beam management operations. For example, symbols #1 to #9 may be used for purposes other than PSBCH transmission (e.g., purposes related to beam management operations).

[0173] In the present invention, S-SSB may be classified into beam management (BM)-S-SSB and Sync-S-SSB. BM-S-SSB may refer to an S-SSB used for beam management operations (e.g., beam measurement operations). In a time slot in which a BM-S-SSB is transmitted and / or arranged, specific resources (e.g., symbols #1 to #9) may be used for purposes other than PSBCH transmission (e.g., purposes related to beam management operations). BM-S-SSB may include an S-PSS and an S-SSS without a PSBCH. Sync-S-SSB may refer to an S-SSB used for synchronization. Sync-S-SSB may correspond to Fig. 9The S-SSB shown. The Sync-S-SSB may include an S-PSS, an S-SSS, and a PSBCH. In addition, the Sync-S-SSB may further include a PSBCH DMRS. The transmission resources of the BM-S-SSB may be configured differently from the transmission resources of the Sync-S-SSB. The transmission resources may include time resources, frequency resources, space resources, and / or transmission periodicity. Alternatively, the transmission resources of the BM-S-SSB may be configured to be the same as the transmission resources of the Sync-S-SSB.

[0174] In order to distinguish S-SSBs (e.g., BM-S-SSBs and / or Sync-S-SSBs), a SLSS identifier (ID) may be used. The transmitting terminal may send all or part of the information of the SLSSID to the receiving terminal through signaling (e.g., RRC signaling, MAC signaling, and / or PHY signaling). The receiving terminal may identify the S-SSB sent by the transmitting terminal based on the information (e.g., SLSSID) received from the transmitting terminal.

[0175] The present invention will describe the BM-S-SSB structure. Configuration information of BM-S-SSB (hereinafter referred to as "synchronization configuration information") can be sent to the terminal with a signal. The synchronization configuration information may include configuration information of BM-S-SSB and / or configuration information of Sync-S-SSB. The synchronization configuration information may include at least one of transmission resource information, identifier information (e.g., SLSSID), beam pattern information, structure information, or type information of a synchronization signal (e.g., BM-S-SSB). The transmission resource information may include at least one of time resource information, frequency resource information, space resource information, or transmission period information of the BM-S-SSB. The beam pattern information may indicate a transmission beam of a transmitting terminal for BM-S-SSB transmission. The structure information may indicate the structure of the BM-S-SSB (e.g., the type of signal included in the BM-S-SSB). The type information may indicate whether the synchronization signal sent by the transmitting terminal is a BM-S-SSB or a Sync-S-SSB. In the present invention, the synchronization signal may refer to a BM-S-SSB and / or a Sync-S-SSB.

[0176] The base station may send synchronization configuration information to the terminal with a signal. Alternatively, the transmitting terminal may send synchronization configuration information to the receiving terminal with a signal. The signaling may include at least one of system information (SI) signaling, RRC signaling, MAC signaling, or PHY signaling. The terminal (e.g., a transmitting terminal and / or a receiving terminal) may receive the synchronization configuration information through signaling. The transmitting terminal may send a synchronization signal (e.g., BM-S-SSB and / or Sync-S-SSB) to the receiving terminal based on the synchronization configuration information. The transmitting terminal may provide synchronization information to the receiving terminal performing the beam management operation by sending the BM-S-SSB. The receiving terminal may perform a receiving operation for the BM-S-SSB based on the synchronization configuration information, and may perform synchronization configuration and / or beam management based on the BM-S-SSB.

[0177] The receiving terminal can receive a synchronization signal (e.g., BM-S-SSB and / or Sync-S-SSB) and can identify the transmitting terminal that transmits the synchronization signal. For example, in the case where the receiving terminal performs SL communication with one or more transmitting terminals or the receiving terminal performs beam management operations with one or more transmitting terminals, the receiving terminal can receive a synchronization signal from one or more transmitting terminals and can identify the transmitting terminal that transmits the synchronization signal received by the receiving terminal. The synchronization signal can be configured to be transmitted through a beam between the transmitting terminal and the receiving terminal. In this case, the receiving terminal can periodically measure the state of the beam based on the synchronization signal received from the transmitting terminal.

[0178] Fig.12 is a conceptual diagram showing a second exemplary embodiment of the structure of a synchronization signal.

[0179] like Fig.12 As shown, the BM-S-SSB may include the S-PSS and the S-SSS. The BM-S-SSB may not include the PSBCH and the PSBCH DMRS. In other words, the PSBCH transmission resources (e.g., Fig.11 In the embodiment of the present invention, a BM-S-SSB (e.g., a BM-S-SSB not including a PSBCH) and a Sync-S-SSB are transmitted in the same resource, and the BM-S-SSB may not cause interference to the PSBCH included in the Sync-S-SSB. In this case, the initial access terminal and / or the re-access terminal can easily acquire synchronization information.

[0180] Fig.13 is a conceptual diagram showing a third exemplary embodiment of the structure of a synchronization signal.

[0181] like Fig.13As shown, the BM-S-SSB may include an S-PSS, an S-SSS, and a beam management (BM) reference signal (RS). The BM RS may be used for beam management operations (e.g., for measurement operations of beam information). An existing RS may be reused as a BM RS. For example, the BM RS may be a CSI-RS. Alternatively, the BM RS may be a newly defined RS specifically for beam management. The BM-S-SSB may not include the PSBCH and the PSBCH DMRS. In the time domain, the BM RS may be arranged on (e.g., mapped to) a PSBCH transmission resource (e.g., Fig.11 Symbols #1 to #9 shown in ). The BM RS may be mapped to some of the PSBCH symbols. A PSBCH symbol may refer to a symbol that transmits (e.g., maps) the PSBCH. In the frequency domain, the BMRS may be mapped to one or more subcarriers of a frequency resource (e.g., a frequency region) of the PSBCH, excluding the subcarriers to which the PSBCH DMRS is mapped. In other words, in the frequency domain, the BM RS may be mapped to one or more subcarriers that do not overlap with the PSBCH DMRS. In this case, the interference caused by the BM-S-SSB to the PSBCH DMRS of the Sync-S-SSB can be minimized, and the number of symbols used to measure beam information (e.g., information about a transmitting beam of a transmitting terminal and / or information about a receiving beam of a receiving terminal) in a beam management operation based on the BM-S-SSB can be maximized.

[0182] In the frequency domain, the BM RS can be configured relative to the PSBCH DMRS. The gap between the position of the BM RS in the frequency domain and the position of the PSBCH DMRS can be expressed as an offset. If the offset is set to +X, the BM RS can be mapped to a subcarrier of X subcarriers above the subcarrier mapping the PSBCH DMRS in the frequency domain. If the offset is set to -X, the BM RS can be mapped to a subcarrier of X subcarriers below the subcarrier mapping the PSBCH DMRS in the frequency domain. The offset (X) can be signaled to the terminal. For example, the synchronization configuration information may include an offset X. X can be a natural number.

[0183] The transmitting terminal may transmit the BM-S-SSB based on the synchronization configuration information. The BM RS included in the BM-S-SSB may be transmitted on the subcarrier determined based on the offset X. The receiving terminal may perform a receiving operation for the BM-S-SSB based on the synchronization configuration information. The receiving terminal may identify the subcarrier on which the BM RS included in the BM-S-SSB is transmitted based on the offset X, and may receive the BM RS in the identified subcarrier. The receiving terminal may measure beam information based on the BM RS.

[0184] Alternatively, the index and subcarrier offset of the lowest subcarrier (or highest subcarrier) in the frequency region in which the BM-S-SSB is transmitted may be configured to the terminal. The BM RS may be mapped to a subcarrier corresponding to the subcarrier offset of the lowest subcarrier (or highest subcarrier) in the frequency region of the BM-S-SSB. The BM RS may be mapped in the frequency domain according to the interval of the subcarrier offset. The transmitting terminal and / or the receiving terminal may identify the subcarrier to which the BM RS is mapped based on the index and subcarrier offset of the lowest subcarrier (or highest subcarrier). The transmitting terminal may send the BM RS in the identified subcarrier, and the receiving terminal may receive the BM RS in the identified subcarrier.

[0185] The BM RS may be configured based on various schemes. The configuration information of the BM RS may be included in the synchronization configuration information. The configuration information of the BM RS may include at least one of information indicating the time resource to which the BM RS is mapped, information indicating the frequency resource to which the BM RS is mapped (e.g., the lowest subcarrier index, the highest subcarrier index and / or the subcarrier offset), a transmission mode of the BM RS, or a transmission density of the BM RS. The configuration information of the BM RS may be transmitted based on at least one of RRC signaling, MAC signaling, or PHY signaling. The BM RS may be configured in a resource pool-specific, sidelink-specific, and / or UE-specific manner.

[0186] Fig.14 is a conceptual diagram showing a fourth exemplary embodiment of the structure of a synchronization signal.

[0187] like Fig.14 As shown, the BM-S-SSB may include S-PSS, S-SSS, and BM RS. The BM RS may be used for beam management operations (e.g., measurement operations for beam information). Existing RSs may be reused as BM RSs. For example, the BM RS may be a CSI-RS. Alternatively, the BM RS may be a newly defined RS specifically for beam management. The BM-S-SSB may not include PSBCH and PSBCH DMRS. In the time domain, the time resources to which the BM RS is mapped may be time resources to which the PSBCH included in the Sync-S-SSB is mapped. The BM RS may be mapped to some of the PSBCH symbols. In the frequency domain, the frequency resources to which the BM RS is mapped may be frequency resources other than the frequency resources to which the Sync-S-SSB (e.g., PSBCH) is mapped.

[0188] For example, the BM RS may be mapped to at least one of the x1 subcarrier and the x2 subcarrier. The x1 subcarrier and the x2 subcarrier may be subcarriers outside the frequency resources to which the Sync-S-SSB (e.g., PSBCH) is mapped. Each of x1 and x2 may be a natural number. Additional frequency resources (e.g., additional subcarriers) may be allocated for the BM RS. The frequency region for transmitting the BM-S-SSB may be wider than the frequency region for transmitting the Sync-S-SSB. The interference caused by the BM-S-SSB to the PSBCH of the Sync-S-SSB may be minimized, and the number of symbols used for beam information measurement in the beam management operation based on the BM-S-SSB may be maximized.

[0189] The index and subcarrier offset of the lowest subcarrier (or highest subcarrier) in the frequency region in which the BM-S-SSB is transmitted may be configured to the terminal. The BM RS may be mapped to a subcarrier corresponding to the subcarrier offset of the lowest subcarrier (or highest subcarrier) in the frequency region of the BM-S-SSB. The BM RS may be mapped in the frequency domain according to the interval of the subcarrier offset. The transmitting terminal and / or the receiving terminal may identify the subcarrier to which the BM RS is mapped based on the index and subcarrier offset of the lowest subcarrier (or highest subcarrier). The transmitting terminal may send the BM RS in the identified subcarrier, and the receiving terminal may receive the BM RS in the identified subcarrier.

[0190] The BM RS may be configured based on various schemes. The configuration information of the BM RS may be included in the synchronization configuration information. The configuration information of the BM RS may include at least one of information indicating the time resource to which the BM RS is mapped, information indicating the frequency resource to which the BM RS is mapped (e.g., the lowest subcarrier index, the highest subcarrier index and / or the subcarrier offset), the transmission mode of the BM RS, or the transmission density of the BM RS. The frequency resources for the transmission of the BM-RS may be additionally configured. The configuration information of the BM RS may be transmitted based on at least one of RRC signaling, MAC signaling, or PHY signaling. The BM RS may be configured in a resource pool-specific, sidelink-specific, and / or UE-specific manner.

[0191] Fig.15 is a conceptual diagram showing a fifth exemplary embodiment of the structure of a synchronization signal.

[0192] like Fig.15As shown, the BM-S-SSB may include S-PSS, S-SSS, and S-XSS. The BM-S-SSB may not include a reference signal (e.g., BM RS). The S-XSS may be an S-PSS (e.g., an additional S-PSS) or an S-SSS (e.g., an additional S-SSS). In other words, the S-PSS and / or S-SSS may be transmitted additionally. The S-PSS and / or S-SSS may be signals known to the terminal. The S-XSS may be arranged in (e.g., mapped to) a PSBCH transmission resource (e.g., Fig.11 Configuration information of the BM-S-SSB (eg, synchronization configuration information) may be signaled to the terminal.

[0193] The transmitting terminal may transmit a BM-S-SSB to the receiving terminal. The receiving terminal may receive the BM-S-SSB and measure beam information (e.g., information of the transmitting beam of the transmitting terminal and / or information of the receiving beam of the receiving terminal) based on the BM-S-SSB. Since the S-SSS, S-PSS, and S-XSS of the BM-S-SSB are mapped to all symbols within a time slot (e.g., excluding automatic gain control (AGC) symbols and / or protection symbols), the receiving terminal may perform beam information measurement operations in all symbols within a time slot (e.g., excluding AGC symbols and / or protection symbols).

[0194] Fig.16 is a conceptual diagram showing a sixth exemplary embodiment of the structure of a synchronization signal.

[0195] like Fig.16 As shown, the BM-S-SSB may include S-PSS, S-SSS and S-XSS. The BM-S-SSB may not include a reference signal (e.g., BM RS). The S-XSS may be an S-PSS (e.g., an additional S-PSS) or an S-SSS (e.g., an additional S-SSS). In other words, the S-PSS and / or S-SSS may be transmitted additionally. The S-PSS and / or S-SSS may be signals known to the terminal. The BM-S-SSB may be transmitted not only in existing symbols for transmitting the S-SSS / S-PSS, but also in additional symbols. In this case, the receiving terminal may perform beam information measurement operations in both the existing symbols and the additional symbols.

[0196] In order to minimize the interference caused by BM-S-SSB to Sync-S-SSB (e.g., PSBCH included in Sync-S-SSB), S-XSS may be mapped to some symbols in the PSBCH transmission resources. S-XSS may be mapped to five symbols (e.g., 9 PSBCH symbols) of all PSBCH symbols, and S-XSS may not be mapped to the remaining 4 PSBCH symbols. In this case, the interference caused by S-XSS of BM-S-SSB to PSBCH of Sync-S-SSB can be reduced.

[0197] In an exemplary embodiment, symbol #1 (e.g., the first symbol in a time slot) may be used for AGC operation. Accordingly, a sequence or signal known to the transmitting terminal and the receiving terminal (e.g., S-SSS, P-SSS, reference signal, and / or PSBCH) may be transmitted in symbol #1. A variant BM-S-SSB, an extended BM-S-SSB, and / or a combined BM-S-SSB from the above-described BM-S-SSB may be used.

[0198] In an exemplary embodiment, the position of the BM RS may be configured differently for each transmitting terminal. For example, the position of the first BM RS of the first transmitting terminal may be configured differently from the position of the second BM RS of the second transmitting terminal. In this case, interference between BM RSs may be minimized. Configuration information of the BM RS may be included in the synchronization configuration information. The receiving terminal may identify the transmitting terminal that transmits the BM-S-SSB by detecting the S-PSS and / or S-SSS included in the BM-S-SSB transmitted by the transmitting terminal. The receiving terminal may perform a receiving operation (e.g., a decoding operation) for the BM RS based on the configuration information of the BM RS associated with the identified transmitting terminal. The receiving terminal may perform a beam information measurement operation based on the BM RS and send a measurement result of the beam information (e.g., BSI) to the transmitting terminal. The transmitting terminal may maintain or change the transmitting beam of the transmitting terminal based on the BSI.

[0199] The receiving terminal can receive a BM-S-SSB from a transmitting terminal based on the configuration information of the BM-S-SSB and / or the BM RS. By detecting the S-PSS and / or the S-SSS included in the BM-S-SSB, the receiving terminal can identify the position of the BM RS and perform a receiving operation (e.g., a decoding operation) for the BM RS at the identified position. For example, based on the detected S-PSS and / or the detected S-SSS, the index of the sequence, the type of the sequence, and / or the SLSSID can be identified, and the position of the transmission resource for the BM RS can be indicated by the index of the sequence, the type of the sequence, and / or the SLSSID. In this case, the receiving terminal can identify the position of the transmission resource for the BM RS based on the index of the sequence, the type of the sequence, and / or the SLSSID, and can perform a receiving operation (e.g., a decoding operation) for the BM RS at the identified position.

[0200] The transmitting terminal may use BM-S-SSB with different structures. For example, the first transmitting terminal may transmit Fig.12 As shown in the BM-S-SSB, the second transmitting terminal can transmit Fig.13 BM-S-SSB shown, and the third transmitting terminal can transmit Fig.15 BM-S-SSB shown. BM RS can be used as a reference signal for beam information measurement configured by CSI-RS. A new reference signal for beam information measurement can be defined.

[0201] Can be based on Fig.10 The BM-S-SSB is transmitted according to the scheme shown. Configuration values ​​for transmission of synchronization signals (e.g., BM-S-SSB and / or Sync-S-SSB) may be preconfigured. Alternatively, the configuration value for transmission of the synchronization signal may be a fixed value. The configuration value for transmission of the synchronization signal may include an S-SSB period, a periodicity of the S-SSB period, a time offset, a time interval, and / or the number of S-SSBs transmitted within a single S-SSB period. All or part of the configuration value for transmission of the synchronization signal may be configured to the terminal through signaling (e.g., SI signaling, RRC signaling, MAC signaling, and / or PHY signaling).

[0202] On the other hand, BM-S-SSB transmission may be performed continuously over a plurality of time slots. A plurality of time slots in which BM-S-SSB transmission is performed may be configured based on a specific period. A synchronization time slot may be a time slot in which a synchronization signal (e.g., BM-S-SSB and / or Sync-S-SSB) is transmitted.

[0203] Fig.17 is a conceptual diagram illustrating a first exemplary embodiment of a method for transmitting a synchronization signal.

[0204] refer to Fig.17 , continuous BM-S-SSB transmission may be performed within an S-SSB period. Continuous BM-S-SSB transmission may be performed in consecutive time slots. Alternatively, continuous BM-S-SSB transmission may be performed in time slots having an interval of n time slots. n may be a natural number and may be included in the synchronization configuration information. Continuous BM-S-SSB group transmission may be performed within an S-SSB period. A BM-S-SSB group may include one or more BM-S-SSBs. The synchronization configuration information may include at least one of information about an S-SSB period (e.g., the length and / or period of an S-SSB period), a time offset for an S-SSB period, a time interval for an S-SSB period, the number of BM-S-SSBs that may be transmitted within an S-SSB period (e.g., consecutive BM-S-SSBs), an interval between time slots in which a BM-S-SSB may be transmitted, the number of BM-S-SSB groups (e.g., consecutive BM-S-SSB groups) that may be transmitted within an S-SSB period, or a time interval of a BM-S-SSB group. All or part of the synchronization configuration information may be transmitted using at least one of SI signaling, RRC signaling, MAC signaling, or PHY signaling.

[0205] The BM-S-SSB may be transmitted in an aperiodic manner or a semi-persistent manner. In this case, the transmitting terminal may transmit the BM-S-SSB in an aperiodic manner or a semi-persistent manner during a preconfigured period (e.g., a predetermined period). If the base station enables BM-S-SSB transmission, the transmitting terminal may transmit the BM-S-SSB. If the base station disables BM-S-SSB transmission, the transmitting terminal may not transmit the BM-S-SSB. Alternatively, the BM-S-SSB may be transmitted in a periodic manner. In this case, the transmitting terminal may transmit the BM-S-SSB periodically. When the BM-S-SSB is transmitted in an aperiodic manner or a semi-persistent manner, the transmission period (e.g., transmission range) of the BM-S-SSB may be configured or indicated to the terminal based on at least one of SI signaling, RRC signaling, MAC signaling, or PHY signaling.

[0206] A beam pattern for transmitting a synchronization signal (e.g., BM-S-SSB and / or Sync-S-SSB) may be defined. The beam pattern may be configured in units of n synchronization signals, n synchronization signal groups, or n S-SSB periods. n may be a natural number and may be configured to the terminal through signaling. n may be included in the synchronization configuration information. In a time period corresponding to a configuration unit of the beam pattern, the transmitting terminal may transmit a synchronization signal using all transmit beams based on the beam pattern. In this case, a beam scanning scheme based on a beam pattern may be used to transmit the synchronization signal.

[0207] A single BM-S-SSB or a single BM-S-SSB group can be configured to transmit using a single transmit beam. In this case, within a BM-S-SSB or a BM-S-SSB group, the same transmit beam can be used for all transmission symbols of the S-PSS, S-SSS, and BM RS used for beam information measurement.

[0208] Unlike the above method, the transmission operation using the same beam (e.g., the same transmit beam) can be configured to be performed in units of n symbols. n can be a natural number. If n is configured to be 1, the transmitting terminal can perform BM-S-SSB transmission using a different beam for each symbol during the BM-S-SSB transmission process. For example, the transmitting terminal can use transmit beam #1 to transmit S-PSS in symbol #m, and can use transmit beam #2 to transmit S-SSS in symbol #m+1.

[0209] Fig.18 is a conceptual diagram illustrating a second exemplary embodiment of a method for transmitting a synchronization signal, and Fig.19 is a conceptual diagram illustrating a third exemplary embodiment of a method for transmitting a synchronization signal.

[0210] like Fig.18 and Fig.19 As shown, the transmitting terminal may transmit a BM-S-SSB within an S-SSB period. The transmitting terminal may transmit eight BM-S-SSBs within an S-SSB period. For example, the transmitting terminal may transmit four consecutive BM-S-SSBs (e.g., BM-S-SSB #1 to #4), and after a time interval starting from the transmission time of the four consecutive BM-S-SSBs, another four consecutive BM-S-SSBs (e.g., BM-S-SSB #5 to #8) may be transmitted. BM-S-SSB #1 to #4 may constitute BM-S-SSB group #1, and BM-S-SSB #5 to #8 may constitute BM-S-SSB group #2. The transmitting terminal may transmit BM-S-SSB based on a beam scanning scheme. The transmitting terminal may transmit BM-S-SSB using four beams (e.g., four transmit beams). The four beams may include beam #1, beam #2, beam #3, and beam #4. The maximum number of beams that can be supported by the transmitting terminal may be 4.

[0211] The transmitting terminal can use one beam to transmit one BM-S-SSB. Fig.18 and Fig.19 In an exemplary embodiment of the present invention, the beam pattern may follow the sequence of "beam #1-beam #2-beam #3-beam #4". The beam pattern information may be configured or indicated to the terminal through signaling. Fig.18In an exemplary embodiment, a different beam may be used for each BM-S-SSB transmission. For example, the transmitting terminal may transmit BM-S-SSB #1 using beam #1, transmit BM-S-SSB #2 using beam #2, transmit BM-S-SSB #3 using beam #3, transmit BM-S-SSB #4 using beam #4, transmit BM-S-SSB #5 using beam #1, transmit BM-S-SSB #6 using beam #2, transmit BM-S-SSB #7 using beam #3, and transmit BM-S-SSB #8 using beam #4.

[0212] exist Fig.19 In an exemplary embodiment, different beams may be used for every 2 BM-S-SSB transmissions. For example, the transmitting terminal may transmit BM-S-SSB #1 and #2 using beam #1, transmit BM-S-SSB #3 and #4 using beam #2, transmit BM-S-SSB #5 and #6 using beam #3, and transmit BM-S-SSB #7 and #8 using beam #4.

[0213] Fig. 20 is a conceptual diagram illustrating a fourth exemplary embodiment of a method for transmitting a synchronization signal.

[0214] like Fig. 20 As shown, the sending terminal can be based on Fig.18 or Fig.19 The method shown is to transfer Fig.12 Since one beam is used for a single BM-S-SSB transmission, the transmitting terminal can transmit the S-PSS and S-SSS belonging to one BM-S-SSB using a single beam (eg, beam #1).

[0215] In the BM-S-SSB transmission process, different beams can be configured for every two symbols (e.g., two consecutive symbols or two non-consecutive symbols). In this case, the transmitting terminal can Fig.21 The method shown or Fig. 22 Shown is the method to transmit BM-S-SSB.

[0216] Fig.21 is a conceptual diagram illustrating a fifth exemplary embodiment of a method for transmitting a synchronization signal.

[0217] like Fig.21 As shown, the sending terminal can transmit Fig.12For example, the transmitting terminal may transmit the first S-PSS of the BM-S-SSB using beam #1, transmit the second S-PSS of the BM-S-SSB using beam #2, transmit the first S-SSS of the BM-S-SSB using beam #1, and transmit the second S-SSS of the BM-S-SSB using beam #2.

[0218] Fig. 22 is a conceptual diagram illustrating a sixth exemplary embodiment of a method for transmitting a synchronization signal.

[0219] refer to Fig. 22 , the sending terminal can transmit Fig.12 For example, the transmitting terminal may transmit the first S-PSS and the second S-PSS of the BM-S-SSB using beam #1, and may transmit the first S-SSS and the second S-SSS of the BM-S-SSB using beam #2.

[0220] based on Fig.21 or Fig. 22 The BM-S-SSB transmission of the method shown can be as follows Fig.23 is performed as shown in the exemplary embodiment of the present invention.

[0221] Fig.23 is a conceptual diagram illustrating a seventh exemplary embodiment of a method for transmitting a synchronization signal.

[0222] like Fig.23 As shown, the transmitting terminal can transmit one BM-S-SSB using two beams. For example, the transmitting terminal can transmit BM-S-SSB#1 using beams #1 and #2, transmit BM-S-SSB#2 using beams #3 and #4, transmit BM-S-SSB#3 using beams #1 and #2, transmit BM-S-SSB#4 using beams #3 and #4, transmit BM-S-SSB#5 using beams #1 and #2, transmit BM-S-SSB#6 using beams #3 and #4, transmit BM-S-SSB#7 using beams #1 and #2, and transmit BM-S-SSB#8 using beams #3 and #4. In this case, a beam scanning operation covering all beams (e.g., four beams) of the transmitting terminal can be achieved through two BM-S-SSB transmissions.

[0223] exist Fig.23In the example of , the beam pattern (e.g., beam scanning pattern) of the transmitting terminal can be defined in units of two BM-S-SSB transmissions. Alternatively, the beam pattern (e.g., beam scanning pattern) of the transmitting terminal can be defined in units of four BM-S-SSB transmissions. In other words, the beam pattern of the transmitting terminal can be defined in units of n BM-S-SSB transmissions. n can be a natural number and can be included in the synchronization configuration information.

[0224] Fig.24 is a conceptual diagram illustrating an eighth exemplary embodiment of a method for transmitting a synchronization signal.

[0225] like Fig.24 As shown, the transmitting terminal can perform BM-S-SSB transmission using a different beam for each symbol. For example, the transmitting terminal can use beam #1 to transmit the first S-PSS of the BM-S-SSB, use beam #2 to transmit the second S-PSS of the BM-S-SSB, use beam #3 to transmit the first S-SSS of the BM-S-SSB, and use beam #4 to transmit the second S-SSS of the BM-S-SSB. When a beam scanning operation (e.g., a beam pattern) is configured, the transmitting terminal can scan all beams during the transmission process of a single BM-S-SSB.

[0226] In the present invention, the synchronization signal (e.g., BM-S-SSB and / or Sync-S-SSB) may have various structures, and resources for transmitting the synchronization signal may be configured in various ways. The transmitting terminal (e.g., a synchronization terminal or a synchronization reference terminal) may independently operate the BM-S-SSB and the Sync-S-SSB. The BM-S-SSB and the Sync-S-SSB may be independently configured.

[0227] In order to prevent the conflict between BM-S-SSB and Sync-S-SSB, BM-S-SSB and Sync-S-SSB can be configured independently. BM-S-SSB transmission can be performed based on the configuration information of BM-S-SSB, and Sync-S-SSB transmission can be performed based on the configuration information of Sync-S-SSB. The configuration information of BM-S-SSB and Sync-S-SSB can be configured to the terminal through signaling.

[0228] Fig.25 is a sequence listing illustrating a first exemplary embodiment of a beam management method.

[0229] like Fig.25As shown, for the case where a transmitting terminal is used as a synchronization terminal (e.g., Sync-UE) for a receiving terminal, an exemplary implementation scheme of a beam management method involving independent operation of Sync-S-SSB and BM-S-SSB may be shown. A synchronization terminal may refer to a terminal that transmits an S-SSB, and a receiving terminal receives the S-SSB for initial synchronization. A base station may generate synchronization configuration information and send the synchronization configuration information to a terminal (e.g., a transmitting terminal and / or a receiving terminal) through signaling. The terminal may receive the synchronization configuration information from the base station. The synchronization configuration information may include configuration information for Sync-S-SSB and / or BM-S-SSB. Sync-S-SSB and BM-S-SSB may be configured independently. Alternatively, a transmitting terminal may generate synchronization configuration information and send it to a receiving terminal through signaling. The receiving terminal may receive synchronization configuration information from the transmitting terminal.

[0230] The transmitting terminal may send a Sync-S-SSB to the receiving terminal based on the synchronization configuration information (S2501). The Sync-S-SSB may be used for synchronization between the transmitting terminal and the receiving terminal. The Sync-S-SSB may have Fig. 9 Structure shown. The receiving terminal can receive Sync-S-SSB from the transmitting terminal based on the synchronization configuration information, and obtain the synchronization information of the transmitting terminal based on the Sync-S-SSB. The receiving terminal can synchronize with the transmitting terminal based on the synchronization information. Thereafter, SL communication (S2502) between the transmitting terminal and the receiving terminal can be performed. SL communication can be performed using a beam. For example, a beam pair between a transmitting beam of the transmitting terminal and a receiving beam of the receiving terminal can be configured, and SL communication can be performed using a beam pair (e.g., a transmitting beam-receiving beam).

[0231] In SL communication, a beam management operation (e.g., a beam measurement operation) may be required. When a beam management operation is required, the transmitting terminal may send a BM-S-SSB to the receiving terminal based on the synchronization configuration information (S2503). Alternatively, the transmitting terminal may send a BM-S-SSB to the receiving terminal regardless of the necessity of the beam management operation. If BM-S-SSB transmission is enabled or activated by the base station (e.g., when information indicating the enabling or activation of BM-S-SSB transmission is received from the base station), the transmitting terminal may send a BM-S-SSB to the receiving terminal. The BM-S-SSB may have Fig.12 , Fig.13 , Fig.14 , Fig.15 or Fig.16 The structure shown in . Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 , Fig. 22 , Fig.23 and / or Fig.24 The method shown in performs BM-S-SSB transmission. BM-S-SSB can be used for beam management operations between a transmitting terminal and a receiving terminal.

[0232] The receiving terminal may receive a BM-S-SSB from the transmitting terminal based on the synchronization configuration information, and measure beam information based on the BM-S-SSB. The receiving terminal may send a measurement result of beam information (e.g., beam state information (BSI)) to the transmitting terminal (S2504). The BSI may include an index of a beam with the best quality among beams (e.g., a transmit beam) of the transmitting terminal and / or quality information of the beam of the transmitting terminal. The transmitting terminal may receive the BSI from the receiving terminal, and maintain or change the transmit beam based on the information element included in the BSI.

[0233] The transmitting terminal may receive information indicating the disabling or deactivation of BM-S-SSB transmission from the base station. In this case, the transmitting terminal may stop BM-S-SSB transmission. When BM-S-SSB transmission is disabled or deactivated, the beam management operation may be stopped.

[0234] In step S2502, before sending the BM-S-SSB, the transmitting terminal may send a request message for BSI to the receiving terminal. The transmitting terminal may send the BM-S-SSB after sending the request message for BSI. In this case, the request message for BSI may include all or part of the configuration information related to BM-S-SSB transmission and / or the configuration information related to the BSI to be reported by the receiving terminal.

[0235] although Fig.25 The exemplary implementation scheme belongs to the case where the transmitting terminal is a synchronous terminal. If the initial synchronization of the receiving terminal is obtained based on another synchronization source (for example, a base station, a satellite, etc.), the receiving terminal can perform the above operations (for example, steps S2503 to S2504) without performing the step of receiving Sync-S-SSB from the transmitting terminal (S2501).

[0236] The operation of the method according to the exemplary embodiment of the present invention can be implemented as a computer-readable program or code in a computer-readable recording medium. The computer-readable recording medium may include a recording device of all types having data that can be read by a computer system. In addition, the computer-readable recording medium can store and execute programs or codes, which can be distributed in a computer system connected via a network and read by a computer in a distributed manner.

[0237] Computer readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM or flash memory. Program instructions may include not only machine language codes created by a compiler, but also high-level language codes that can be executed by a computer using an interpreter.

[0238] Although some aspects of the present invention have been described in the context of a device, these aspects may indicate the corresponding description according to the method, and a block or device may correspond to the step of the method or the feature of the step. Similarly, the aspects described in the context of the method may be represented as the feature of a corresponding block or project or a corresponding device. Some or all steps of the method may be performed by (or using) a hardware device such as a microprocessor, a programmable computer or an electronic circuit. In some embodiments, one or more of the most important steps of the method may be performed by such a device.

[0239] In some exemplary embodiments, a programmable logic device such as a field programmable gate array can be used to perform some or all of the functions of the methods described herein. In some exemplary embodiments, the field programmable gate array can be operated with a microprocessor to perform one of the methods described herein. Typically, the method is preferably performed by a specific hardware device.

[0240] The description of the present invention is merely exemplary in nature, and therefore variant forms that do not deviate from the essence of the present invention are intended to be within the scope of the present invention. Such variant forms should not be considered as departing from the spirit and scope of the present invention. Therefore, it will be understood by those of ordinary skill in the art that various changes in form and details may be made without departing from the spirit and scope defined by the appended claims.

Claims

1. A method of a first user equipment (UE), comprising: sending one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) to a second UE; as well as receiving beam state information (BSI) based on one or more BM-S-SSB measurements from a second UE, Among them, each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

2. The method according to claim 1, further comprising: before sending the one or more BM-S-SSBs, sending one or more Sync-S-SSBs to the second UE, Among them, one or more Sync-S-SSBs are used for synchronization between the first UE and the second UE, and each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

3. The method according to claim 1, wherein: Each of the one or more BM-S-SSBs further includes a BM reference signal (RS), and the BM RS is mapped to a transmission resource of the PSBCH in the time domain.

4. The method according to claim 3, wherein: The BM RS is mapped to one or more subcarriers in the frequency domain, and the one or more subcarriers do not overlap with a PSBCH demodulation reference signal (DMRS) included in the Sync-S-SSB transmitted by the first UE.

5. The method according to claim 4, wherein: One or more subcarriers to which the BM RS is mapped in the frequency domain are determined based on an offset with respect to a subcarrier to which the PSBCH DMRS is mapped.

6. The method according to claim 1, wherein: The BM-S-SSB further includes one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs are mapped to the transmission resources of the PSBCH in the time domain.

7. The method according to claim 2, further comprising: receiving synchronization configuration information including first configuration information of Sync-S-SSB and second configuration information of BM-S-SSB from a base station, Among them, one or more Sync-S-SSBs are sent based on the first configuration information, and one or more BM-S-SSBs are sent based on the second configuration information.

8. The method according to claim 2, wherein: One or more Sync-S-SSBs and one or more BM-S-SSBs are independently configured, and transmission resources of the one or more Sync-S-SSBs are different from transmission resources of the one or more BM-S-SSBs.

9. The method according to claim 1, further comprising: Maintain or change the beam used in SL communication between the first UE and the second UE based on the BSI.

10. The method according to claim 1, wherein: One or more BM-S-SSBs are transmitted based on a beam scanning scheme according to a beam pattern, and are transmitted through different beams in units of n BM-S-SSBs, where n is a natural number.

11. A method of a second user equipment (UE), comprising: receiving one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) from a first UE; beam information for the first UE based on the one or more BM-S-SSB measurements; as well as sending beam state information (BSI) including beam information to the first UE, Among them, each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

12. The method according to claim 11, further comprising: Before receiving one or more BM-S-SSBs, receiving one or more Sync-S-SSBs from the first UE; as well as obtaining synchronization information of the first UE based on one or more Sync-S-SSBs, Each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

13. The method according to claim 11, wherein: Each of the one or more BM-S-SSBs further includes a BM reference signal (RS), and the BM RS is mapped to a transmission resource of the PSBCH in the time domain.

14. The method according to claim 13, wherein: The BM RS is mapped to one or more subcarriers in the frequency domain, and the one or more subcarriers do not overlap with a PSBCH demodulation reference signal (DMRS) included in the Sync-S-SSB received from the first UE.

15. The method according to claim 11, wherein: The BM-S-SSB further includes one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs are mapped to the transmission resources of the PSBCH in the time domain.

16. A first user equipment (UE), comprising at least one processor, wherein the at least one processor causes the first UE to execute: sending one or more beam management (BM)-sidelink (S)-synchronization signal blocks (SSBs) to a second UE; and receiving beam state information (BSI) based on one or more BM-S-SSB measurements from a second UE, in, Each of the one or more BM-S-SSBs includes a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) without a physical sidelink broadcast channel (PSBCH).

17. The first UE according to claim 16, wherein: The at least one processor further causes the first UE to perform: before sending the one or more BM-S-SSBs, sending one or more Sync-S-SSBs to the second UE, Among them, one or more Sync-S-SSBs are used for synchronization between the first UE and the second UE, and each of the one or more Sync-S-SSBs includes S-PSS, S-SSS and PSBCH.

18. The first UE according to claim 16, wherein: Each of the one or more BM-S-SSBs further includes a BM reference signal (RS), and the BM RS is mapped to a transmission resource of the PSBCH in the time domain.

19. The first UE according to claim 18, wherein: The BM RS is mapped to one or more subcarriers in the frequency domain, and the one or more subcarriers do not overlap with a PSBCH demodulation reference signal (DMRS) included in the Sync-S-SSB transmitted by the first UE.

20. The first UE according to claim 16, wherein: The BM-S-SSB further includes one or more additional S-PSSs or at least one of one or more additional S-SSSs, and the one or more additional S-PSSs or at least one of the one or more additional S-SSSs are mapped to the transmission resources of the PSBCH in the time domain.

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