WO2024076064A1

WO2024076064A1 - Method and device for synchronization signal-based beam tracking and management in sidelink communication

Info

Publication number: WO2024076064A1
Application number: PCT/KR2023/014467
Authority: WO
Inventors: 홍의현; 손혁민
Original assignee: 현대자동차주식회사; 기아 주식회사; 가천대학교 산학협력단
Priority date: 2022-10-06
Filing date: 2023-09-22
Publication date: 2024-04-11
Also published as: KR20240048479A

Abstract

A method and a device for synchronization signal-based beam tracking and management in sidelink communication are disclosed. A method for a first UE comprises the steps of: transmitting a BSI request to a second UE; transmitting, to the second UE, first S-SSBs according to the BSI request; and receiving, from the second UE, first BSI measured on the basis of the first S-SSBs.

Description

Method and device for synchronization signal-based beam tracking and management in sidelink communication

This disclosure relates to sidelink communication technology, and more specifically to synchronization signal-based beam tracking and management technology.

Communication networks (e.g., 5G communication network, 6G communication network, etc.) are being developed to provide improved communication services than existing communication networks (e.g., LTE (long term evolution), LTE-A (advanced), etc.). there is. 5G communication networks (e.g., new radio (NR) communication networks) may support frequency bands above 6 GHz as well as below 6 GHz. In other words, the 5G communication network may support the FR1 band and/or FR2 band. The 5G communication network can support a variety of communication services and scenarios compared to the LTE communication network. For example, usage scenarios of 5G communication networks may include enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

The 6G communication network can support a variety of communication services and scenarios compared to the 5G communication network. 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 various and wide frequency bands and can be applied to various usage scenarios (e.g., terrestrial communication, non-terrestrial communication, sidelink communication, etc.) there is.

Meanwhile, beam tracking and/or beam management operations for sidelink communication may be necessary. Beam tracking/management operations may be performed based on a channel state information-reference signal (CSI-RS). Additionally, beam tracking/management operations using sidelink-synchronization signal block (S-SSB) may be considered. In this case, specific procedures for beam tracking/management operations using S-SSB may be required.

The purpose of the present disclosure to solve the above problems is to provide a method and device for beam tracking/management in sidelink communication.

A method of a first UE according to embodiments of the present disclosure for achieving the above purpose includes transmitting a BSI request to a second UE, transmitting first S-SSBs according to the BSI request to the second UE. and receiving a first BSI measured based on the first S-SSBs from the second UE.

The BSI request may include configuration information of the first S-SSBs, and the configuration information may include at least one of time resource information, frequency resource information, or transmission period information of the first S-SSBs. .

The first S-SSBs may be configured for beam management operation, and the first S-SSBs may be distinguished from S-SSBs configured for synchronization.

The BSI request may include information indicating whether to perform BSI reporting, and when the information indicates performing the BSI reporting, the first BSI may be received from the second UE, and the information If indicates not to perform the BSI reporting, the first BSI may not be received from the second UE.

The BSI request may be included in an SCI, MAC CE, or RRC message transmitted to the second UE.

The first BSI may include measurement information about the beams of the first UE and information indicating whether to stop S-SSB transmission, and if the information indicates to stop S-SSB transmission, the first BSI After receiving the BSI, the first UE may stop transmitting the S-SSB, and if the information does not indicate stopping the S-SSB transmission, after receiving the first BSI, the first UE may stop transmitting the S-SSB. Transmission can be performed.

The method of the first UE further includes transmitting second S-SSBs to the second UE, and receiving a second BSI measured based on the second S-SSBs from the second UE. It may include, the first S-SSBs may be a first S-SSB group, the second S-SSBs may be a second S-SSB group, and the BSI measurement operation in the second UE may be S- It can be performed as a unit of SSB group.

The method of the first UE may further include receiving a BM request from the second UE, and the BM request may include information indicating whether a beam management operation is necessary, and the information may be If the information indicates that a beam management operation is necessary, the first UE may transmit the BSI request, and if the information indicates that the beam management operation is not necessary, the first UE may not transmit the BSI request. It may not be possible.

A method of a second UE according to embodiments of the present disclosure for achieving the above purpose includes receiving a BSI request from a first UE, receiving first S-SSBs according to the BSI request from the first UE. generating a first BSI by performing a beam measurement operation based on the first S-SSBs, and transmitting the first BSI to the first UE.

The BSI request may include information indicating whether to perform BSI reporting, and if the information indicates performing the BSI reporting, the second UE may transmit the first BSI to the first UE. And, if the information indicates not to perform the BSI reporting, the second UE may not transmit the first BSI to the first UE.

The BSI request may be included in an SCI, MAC CE, or RRC message received from the first UE.

The first BSI may include measurement information about the beams of the first UE and information indicating whether to stop S-SSB transmission, and if the information indicates to stop S-SSB transmission, the first BSI After transmitting the BSI, the second UE may stop receiving the S-SSB, and if the information does not indicate stopping the S-SSB transmission, after transmitting the first BSI, the second UE may stop receiving the S-SSB. can be performed.

The method of the second UE includes receiving second S-SSBs from the first UE, generating a second BSI by performing the beam measurement operation based on the second S-SSBs, and It may further include transmitting a second BSI to the first UE, wherein the first S-SSBs may be a first S-SSB group, and the second S-SSBs may be a second S-SSB group. and the second UE can perform the beam measurement operation in units of S-SSB groups.

The method of the second UE may further include transmitting a BM request to the first UE, wherein the BM request may include information indicating whether a beam management operation is necessary, and the information may include the step of transmitting a BM request to the first UE. If the information indicates that a beam management operation is required, the second UE may perform a reception operation for the BSI request, and if the information indicates that the beam management operation is not necessary, the second UE may perform the Receiving operations for BSI requests may not be performed.

A first UE according to embodiments of the present disclosure for achieving the above purpose includes at least one processor, wherein the first UE transmits a BSI request to the second UE, and the BSI Transmit first S-SSBs according to the request to the second UE, and cause to receive a first BSI measured based on the first S-SSBs from the second UE.

The BSI request may include configuration information of the first S-SSBs, and the configuration information may include at least one of time resource information, frequency resource information, or transmission period information of the first S-SSBs, , the first S-SSBs may be configured for beam management operation, and the first S-SSBs may be distinguished from S-SSBs configured for synchronization.

The at least one processor causes the first UE to transmit second S-SSBs to the second UE, and to receive a second BSI measured based on the second S-SSBs from the second UE. It may further cause, the first S-SSBs may be a first S-SSB group, the second S-SSBs may be a second S-SSB group, and the BSI measurement operation in the second UE is S -Can be performed as a unit of SSB group.

The at least one processor may further cause the first UE to receive a BM request from the second UE, where the BM request may include information indicating whether a beam management operation is required, and the information If the information indicates that the beam management operation is necessary, the first UE may transmit the BSI request, and if the information indicates that the beam management operation is not necessary, the first UE may transmit the BSI request. It may not be transmitted.

According to the present disclosure, the transmitting terminal can transmit a beam state information (BSI) request to the receiving terminal and can transmit sidelink-synchronization signal blocks (S-SSBs) according to the BSI request to the receiving terminal. The receiving terminal can transmit the BSI to the transmitting terminal by performing a measurement operation on S-SSBs. According to the above operation, S-SSB-based beam management operation can be performed and SL communication can be performed efficiently.

Figure 1 is a conceptual diagram showing scenarios of V2X communication.

Figure 2 is a conceptual diagram showing a first embodiment of a communication system.

Figure 3 is a block diagram showing a first embodiment of a communication node constituting a communication system.

Figure 4 is a block diagram showing a first embodiment of communication nodes performing communication.

Figure 5A is a block diagram showing a first embodiment of a transmission path.

Figure 5b is a block diagram showing a first embodiment of a receive path.

Figure 6 is a block diagram showing a first embodiment of a user plane protocol stack of a UE performing sidelink communication.

Figure 7 is a block diagram showing a first embodiment of a control plane protocol stack of a UE performing sidelink communication.

Figure 8 is a block diagram showing a second embodiment of a control plane protocol stack of a UE performing sidelink communication.

Figure 9 is a conceptual diagram showing the first embodiment of S-SSB.

Figure 10 is a conceptual diagram showing the first embodiment of the S-SSB section.

Figure 11 is a flowchart showing a first embodiment of a beam management method.

Figure 12 is a flowchart showing a second embodiment of the beam management method.

Figure 13 is a flowchart showing a third embodiment of a beam management method.

Figure 14 is a flowchart showing a fourth embodiment of a beam management method.

Figure 15 is a flowchart showing a fifth embodiment of the beam management method.

Figure 16 is a flowchart showing a sixth embodiment of the beam management method.

Figure 17 is a flowchart showing a seventh embodiment of a beam management method.

Figure 18 is a flowchart showing the eighth embodiment of the beam management method.

Since the present disclosure can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present disclosure.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present disclosure. The term “and/or” can mean any one of a plurality of related stated items or a combination of a plurality of related stated items.

In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Additionally, in the present disclosure, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B.”

In this disclosure, (re)transmit can mean “transmit”, “retransmit”, or “transmit and retransmit”, and (re)set means “set”, “reset”, or “set and reset”. can mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection can mean “connection,” “reconnection,” or “connection and reconnection.” It can mean.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this disclosure are only used to describe specific embodiments and are not intended to limit the disclosure. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present disclosure, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present disclosure, should not be interpreted in an idealized or excessively formal sense. No.

Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate overall understanding in explaining the present disclosure, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted. In addition to the embodiments explicitly described in this disclosure, operations may be performed according to combinations of embodiments, extensions of embodiments, and/or variations of embodiments. Performance of some operations may be omitted, and the order of performance of operations may be changed.

In an embodiment, even when a method performed in a first communication node among communication nodes (e.g., transmission or reception of a signal) is described, the corresponding second communication node is similar to the method performed in the first communication node. A method (eg, receiving or transmitting a signal) may be performed. In other words, when the operation of a user equipment (UE) is described, the corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, when the operation of the base station is described, the corresponding UE may perform an operation corresponding to the operation of the base station.

The base station is NodeB, evolved NodeB, gNodeB (next generation node B), gNB, device, apparatus, node, communication node, BTS (base transceiver station), RRH ( It may be referred to as a radio remote head (radio remote head), transmission reception point (TRP), radio unit (RU), road side unit (RSU), radio transceiver, access point, access node, etc. . UE is a terminal, device, device, node, communication node, end node, access terminal, mobile terminal, station, subscriber station, mobile station. It may be referred to as a mobile station, a portable subscriber station, or an on-broad unit (OBU).

In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or physical (PHY) signaling. Messages used for upper layer signaling may be referred to as “upper layer messages” or “higher layer signaling messages.” Messages used for MAC signaling may be referred to as “MAC messages” or “MAC signaling messages.” Messages used for PHY signaling may be referred to as “PHY messages” or “PHY signaling messages.” Upper layer signaling may refer to transmission and reception operations of system information (e.g., master information block (MIB), system information block (SIB)) and/or RRC messages. MAC signaling may refer to the transmission and reception operations of a MAC CE (control element). PHY signaling may refer to the transmission and reception of control information (e.g., downlink control information (DCI), uplink control information (UCI), and sidelink control information (SCI)). Signaling may mean signaling between a base station and a terminal and/or signaling between terminals.

In the present disclosure, “setting an operation (e.g., a transmission operation)” means “setting information (e.g., information element, parameter) for the operation” and/or “performing the operation.” This may mean that “indicating information” is signaled. “An information element (eg, parameter) is set” may mean that the information element is signaled. In this disclosure, “signal and/or channel” may mean a signal, a channel, or “signal and channel,” and signal may be used to mean “signal and/or channel.”

The communication network to which the embodiment is applied is not limited to the content described below, and the embodiment may be applied to various communication networks (eg, 4G communication network, 5G communication network, and/or 6G communication network). Here, communication network may be used in the same sense as communication system.

Figure 1 is a conceptual diagram illustrating scenarios of V2X (Vehicle to everything) communication.

Referring to Figure 1, V2X communication may include V2V (Vehicle to Vehicle) communication, V2I (Vehicle to Infrastructure) communication, V2P (Vehicle to Pedestrian) communication, V2N (Vehicle to Network) 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 is referred to as "C-V2X (Cellular-Vehicle to everything) communication." It can be. The communication system 140 is a 4th Generation (4G) communication system (e.g., Long Term Evolution (LTE) communication system, Advanced (LTE-A) communication system), a 5th Generation (5G) communication system (e.g., NR (New Radio) communication system), etc.

V2V communication is communication between vehicle #1 (100) (e.g., a communication node located in vehicle #1 (100)) and vehicle #2 (110) (e.g., a communication node located in vehicle #1 (100)) It can mean. Driving information (e.g., speed, heading, time, position, etc.) may be exchanged between

vehicles

100 and 110 through V2V communication. Autonomous driving (eg, platooning) may be supported based on driving information exchanged through V2V communication. V2V communication supported by the communication system 140 may be performed based on sidelink communication technology (eg, ProSe (Proximity based Services) communication technology, D2D (Device to Device) communication technology). In this case, communication between

vehicles

100 and 110 may be performed using a sidelink channel.

V2I communication may refer to communication between vehicle #1 (100) and infrastructure (eg, road side unit (RSU)) 120 located at the roadside. The infrastructure 120 may be a traffic light or street light located on the roadside. For example, when V2I communication is performed, communication may be performed between a communication node located in vehicle #1 (100) and a communication node located at a traffic light. Driving information, traffic information, etc. can be exchanged between vehicle #1 (100) and infrastructure (120) through V2I communication. V2I communication supported by the communication system 140 may be performed based on sidelink communication technology (eg, ProSe communication technology, D2D communication technology). In this case, communication between vehicle #1 (100) and infrastructure 120 may be performed using a sidelink channel.

V2P communication may mean communication between vehicle #1 (100) (e.g., a communication node located in vehicle #1 (100)) and a person 130 (e.g., a communication node possessed by the person 130). You can. Through V2P communication, driving information of vehicle #1 (100) and movement information of person (130) (e.g., speed, direction, time, location, etc.) are exchanged between vehicle #1 (100) and person (130). It may be that the communication node located in vehicle #1 (100) or the communication node possessed by the person (130) determines a dangerous situation based on the acquired driving information and movement information and generates an alarm indicating danger. . V2P communication supported by communication system 140 may be performed based on sidelink communication technology (eg, ProSe communication technology, D2D communication technology). In this case, communication between the communication node located in vehicle #1 (100) or the communication node possessed by the person (130) may be performed using a sidelink channel.

V2N communication may mean communication between vehicle #1 (100) (eg, a communication node located in vehicle #1 (100)) and a communication system (eg, communication network) 140. V2N communication can be performed based on 4G communication technology (e.g., LTE communication technology and LTE-A communication technology specified in 3GPP standards), 5G communication technology (e.g., NR communication technology specified in 3GPP standards), etc. there is. In addition, V2N communication is a communication technology specified in the IEEE (Institute of Electrical and Electronics Engineers) 702.11 standard (e.g., WAVE (Wireless Access in Vehicular Environments) communication technology, WLAN (Wireless Local Area Network) communication technology, etc.), IEEE It may be performed based on communication technology specified in the 702.15 standard (e.g., WPAN (Wireless Personal Area Network), etc.).

Meanwhile, the communication system 140 supporting V2X communication may be configured as follows.

Referring to FIG. 2, the communication system may include an access network, a core network, etc. The access network may include a base station 210, a relay 220, and user equipment (UE) 231 to 236. UEs 231 to 236 may be communication nodes located in

vehicles

100 and 110 of FIG. 1, communication nodes located in infrastructure 120 of FIG. 1, communication nodes possessed by person 130 of FIG. 1, etc. If the communication system supports 4G communication technology, the core network includes a serving-gateway (S-GW) 250, a packet data network (PDN)-gateway (P-GW) 260, and a mobility management entity (MME) ( 270), etc. may be included.

If 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. there is. Alternatively, if NSA (Non-StandAlone) is supported in the communication system, the core network consisting of S-GW (250), P-GW (260), MME (270), etc. supports not only 4G communication technology but also 5G communication technology. The core network consisting of UPF (250), SMF (260), AMF (270), etc. can support not only 5G communication technology but also 4G communication technology.

Additionally, if the communication system supports network slicing technology, the core network may be divided into a plurality of logical network slices. For example, a network slice that supports V2X communication (e.g., V2V network slice, V2I network slice, V2P network slice, V2N network slice, etc.) may be set, and V2X communication is performed on the V2X network slice set in the core network. can be supported by

Communication nodes that make up the communication system (e.g., base station, relay, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) use CDMA (code division multiple access) technology, WCDMA (wideband CDMA) ) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)- 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) Communication may be performed using at least one communication technology among the technologies.

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

Referring to FIG. 3, the communication node 300 may include at least one processor 310, a memory 320, and a transmitting and receiving device 330 that is connected to a network and performs communication. Additionally, 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 is connected by a bus 370 and can communicate with each other.

However, each component included in the communication node 300 may be connected through an individual interface or individual bus centered on the processor 310, rather than the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transmission and reception device 330, the input interface device 340, the output interface device 350, and the storage device 360 through a dedicated interface. .

The processor 310 may execute a program command 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 methods according to embodiments of the present disclosure are performed. Each of the memory 320 and the storage device 360 may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may be comprised of at least one of read only memory (ROM) and random access memory (RAM).

Referring again to FIG. 2, in the communication system, the base station 210 may form a macro cell or small cell and may be connected to the core network through ideal backhaul or non-ideal backhaul. The base station 210 may transmit signals received from the core network to the UEs 231 to 236 and the relay 220, and may transmit signals received from the UEs 231 to 236 and the relay 220 to the core network. . UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) may belong to the cell coverage of the base station 210. UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) can be connected to the base station 210 by performing a connection establishment procedure with the base station 210. . UE #1, #2, #4, #5, and #6 (231, 232, 234, 235, 236) can communicate with the base station 210 after being connected to the base station 210.

The relay 220 may be connected to the base station 210 and may relay communication between the base station 210 and UE #3 and #4 (233, 234). The relay 220 may transmit signals received from the base station 210 to UE #3 and #4 (233, 234), and may transmit signals received from UE #3 and #4 (233, 234) to the base station 210. can be transmitted to. UE #4 234 may belong to the cell coverage of the base station 210 and the cell coverage of the relay 220, and UE #3 233 may belong to the cell coverage of the relay 220. In other words, UE #3 233 may be located outside the cell coverage of the base station 210. UE #3 and #4 (233, 234) can be connected to the relay 220 by performing a connection establishment procedure with the relay 220. UE #3 and #4 (233, 234) may communicate with the relay 220 after being connected to the relay 220.

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

Here, the base station 210 is a NodeB, an evolved NodeB, a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), and an RSU ( It may be referred to as a road side unit, a radio transceiver, an access point, an access node, etc. Relay 220 may be referred to as a small base station, relay node, etc. UEs 231 to 236 are terminals, access terminals, mobile terminals, stations, subscriber stations, mobile stations, and portable subscriber stations. It may be referred to as a subscriber station, a node, a device, an on-broad unit (OBU), etc.

Meanwhile, communication nodes that perform communication in a communication network may be configured as follows. The communication node shown in FIG. 4 may be a specific embodiment of the communication node shown in FIG. 3.

Referring to FIG. 4, each of the first communication node 400a and the second communication node 400b may be a base station or UE. The first communication node 400a may transmit a signal to the second communication node 400b. The transmission processor 411 included in the first communication node 400a may receive data (eg, data unit) from the data source 410. Transmitting processor 411 may receive control information from controller 416. Control information may be at least one of system information, RRC configuration information (e.g., information set by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI). It can contain one.

The transmission processor 411 may generate data symbol(s) by performing processing operations (eg, encoding operations, symbol mapping operations, etc.) on data. The transmission processor 411 may generate control symbol(s) by performing processing operations (eg, encoding operations, symbol mapping operations, etc.) on control information. Additionally, the transmit processor 411 may generate synchronization/reference symbol(s) for the synchronization signal and/or reference signal.

The Tx MIMO processor 412 may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and/or synchronization/reference symbol(s). there is. The output (eg, symbol stream) of the Tx MIMO processor 412 may be provided to modulators (MODs) included in the transceivers 413a to 413t. A modulator (MOD) may generate modulation symbols by performing processing operations on the symbol stream, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols. A signal can be generated by performing Signals generated by the modulators (MODs) of the transceivers 413a through 413t may be transmitted through antennas 414a through 414t.

Signals transmitted by the first communication node 400a may be received at the antennas 464a to 464r of the second communication node 400b. Signals received from the antennas 464a to 464r may be provided to demodulators (DEMODs) included in the transceivers 463a to 463r. A demodulator (DEMOD) may obtain samples by performing processing operations (eg, filtering operation, amplification operation, down-conversion operation, digital conversion operation) on the signal. A demodulator (DEMOD) may perform additional processing operations on the samples to obtain symbols. MIMO detector 462 may perform MIMO detection operation on symbols. The receiving processor 461 may perform processing operations (eg, deinterleaving operations, decoding operations) on symbols. The output of receiving processor 461 may be provided to 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.

Meanwhile, the second communication node 400b may transmit a signal to the first communication node 400a. The transmission processor 468 included in the second communication node 400b may receive data (e.g., a data unit) from the data source 467 and perform a processing operation on the data to generate data symbol(s). can be created. Transmission processor 468 may receive control information from controller 466 and may perform processing operations on the control information to generate control symbol(s). Additionally, the transmit processor 468 may generate reference symbol(s) by performing a processing operation on the reference signal.

The Tx MIMO processor 469 may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and/or reference symbol(s). The output (e.g., symbol stream) of the Tx MIMO processor 469 may be provided to modulators (MODs) included in the transceivers 463a to 463t. A modulator (MOD) may generate modulation symbols by performing processing operations on the symbol stream, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols. A signal can be generated by performing Signals generated by the modulators (MODs) of the transceivers 463a through 463t may be transmitted through antennas 464a through 464t.

Signals transmitted by the second communication node 400b may be received at the antennas 414a to 414r of the first communication node 400a. Signals received from the antennas 414a to 414r may be provided to demodulators (DEMODs) included in the transceivers 413a to 413r. A demodulator (DEMOD) may obtain samples by performing processing operations (eg, filtering operation, amplification operation, down-conversion operation, digital conversion operation) on the signal. A demodulator (DEMOD) may perform additional processing operations on the samples to obtain symbols. The MIMO detector 420 may perform a MIMO detection operation on symbols. The receiving processor 419 may perform processing operations (eg, deinterleaving operations, decoding operations) on symbols. The output of receive processor 419 may be provided to data sink 418 and controller 416. For example, data may be provided to data sink 418 and control information may be provided to controller 416.

Memories

415 and 465 may store data, control information, and/or program code. The scheduler 417 may perform scheduling operations for communication. The

processors

411, 412, 419, 461, 468, 469 and the

controllers

416, 466 shown in FIG. 4 may be the processor 310 shown in FIG. 3 and are used to perform the methods described in this disclosure. can be used

FIG. 5A is a block diagram showing a first embodiment of a transmit path, and FIG. 5B is a block diagram showing a first embodiment of a receive path.

5A and 5B, the transmit path 510 may be implemented in a communication node that transmits a signal, and the receive path 520 may be implemented in a communication node that receives a signal. The transmission path 510 includes a channel coding and modulation block 511, a serial-to-parallel (S-to-P) block 512, an Inverse Fast Fourier Transform (N IFFT) block 513, and a P-to-S (parallel-to-serial) block 514, a cyclic prefix (CP) addition block 515, and up-converter (UC) 516. The reception path 520 includes a down-converter (DC) 521, a CP removal block 522, an S-to-P block 523, an N FFT block 524, a P-to-S block 525, and a channel decoding and demodulation block 526. Here, N may be a natural number.

Information bits in the transmission path 510 may be input to the channel coding and modulation block 511. The channel coding and modulation block 511 performs coding operations (e.g., low-density parity check (LDPC) coding operations, polar coding operations, etc.) and modulation operations (e.g., low-density parity check (LDPC) coding operations, etc.) on information bits. , QPSK (Quadrature Phase Shift Keying), QAM (Quadrature Amplitude Modulation), etc.) can be performed. The output of channel coding and modulation block 511 may be a sequence of modulation symbols.

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

The CP addition block 515 can insert CP into the signal. The UC 516 may up-convert the frequency of the output of the CP addition block 515 to a radio frequency (RF) frequency. Additionally, the output of CP addition block 515 may be filtered at baseband prior to upconversion.

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

In FIGS. 5A and 5B, Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. Each of the blocks (eg, components) in FIGS. 5A and 5B may be implemented by at least one of hardware, software, or firmware. For example, in FIGS. 5A and 5B, some blocks may be implemented by software, and other blocks may be implemented by hardware or a “combination of hardware and software.” 5A and 5B, one block may be subdivided into a plurality of blocks, a plurality of blocks may be integrated into one block, some blocks may be omitted, and blocks supporting other functions may be added. It can be.

Meanwhile, communication between UE #5 235 and UE #6 236 may be performed based on cyclic link communication technology (eg, ProSe communication technology, D2D communication technology). Sidelink communication may be performed based on a one-to-one method or a one-to-many method. When V2V communication is performed using Cylink communication technology, UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) may indicate a communication node located in vehicle #1 (100) of FIG. 1. The communication node located in vehicle #2 (110) can be indicated. When V2I communication is performed using Cyclink communication technology, UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) may indicate a communication node located in vehicle #1 (100) of FIG. 1. A communication node located in the infrastructure 120 may be indicated. When V2P communication is performed using Cyclink communication technology, UE #5 (235) may indicate a communication node located in vehicle #1 (100) of FIG. 1, and UE #6 (236) may indicate a communication node located in vehicle #1 (100) of FIG. 1. The communication node possessed by the person 130 can be indicated.

Scenarios to which sidelink communication is applied can be classified as shown in Table 1 below according to the locations of UEs (e.g., UE #5 (235), UE #6 (236)) participating in sidelink communication. For example, the scenario for sidelink communication between UE #5 (235) and UE #6 (236) shown in FIG. 2 may be sidelink communication scenario #C.

Meanwhile, the user plane protocol stack of UEs performing sidelink communication (e.g., UE #5 (235), UE #6 (236)) may be configured as follows.

Referring to FIG. 6, UE #5 (235) may be UE #5 (235) shown in FIG. 2, and UE #6 (236) may be UE #6 (236) shown in FIG. 2. The scenario for sidelink communication between UE #5 (235) and UE #6 (236) may be one of sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack of UE #5 (235) and UE #6 (236) each includes a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer. It may include etc.

Sidelink communication between UE #5 (235) and UE #6 (236) may be performed using the PC5 interface (e.g., PC5-U interface). For sidelink communication, a layer 2-ID (identifier) (e.g., source layer 2-ID, destination layer 2-ID) may be used, and layer 2-ID is set for V2X communication. It may be an ID. Additionally, in sidelink communication, hybrid ARQ (automatic repeat request) feedback operation may be supported, and RLC Acknowledged Mode (AM) or RLC Unacknowledged Mode (UM) may be supported.

Meanwhile, the control plane protocol stack of UEs performing sidelink communication (e.g., UE #5 (235), UE #6 (236)) may be configured as follows.

FIG. 7 is a block diagram showing a first embodiment of a control plane protocol stack of a UE performing sidelink communication, and FIG. 8 is a block diagram showing a second embodiment of a control plane protocol stack of a UE performing sidelink communication. It is a block diagram.

Referring to Figures 7 and 8, UE #5 (235) may be UE #5 (235) shown in Figure 2, and UE #6 (236) may be UE #6 (236) shown in Figure 2. You can. The scenario for sidelink communication between UE #5 (235) and UE #6 (236) may be one of sidelink communication scenarios #A to #D in Table 1. The control plane protocol stack shown in FIG. 7 may be a control plane protocol stack for transmitting and receiving broadcast information (eg, Physical Sidelink Broadcast Channel (PSBCH)).

The control plane protocol stack shown in FIG. 7 may include a PHY layer, MAC layer, RLC layer, and radio resource control (RRC) layer. Sidelink communication between UE #5 (235) and UE #6 (236) may be performed using the PC5 interface (e.g., PC5-C interface). The control plane protocol stack shown in FIG. 8 may be a control plane protocol stack for one-to-one sidelink communication. The control plane protocol stack shown in FIG. 8 may include a PHY layer, MAC layer, RLC layer, PDCP layer, PC5 signaling protocol layer, etc.

Meanwhile, the channels used in sidelink communication between UE #5 (235) and UE #6 (236) are PSSCH (Physical Sidelink Shared Channel), PSCCH (Physical Sidelink Control Channel), PSDCH (Physical Sidelink Discovery Channel), and PSBCH ( Physical Sidelink Broadcast Channel), etc. PSSCH can be used for transmission and reception of sidelink data, and can be set to UE (e.g., UE #5 (235), UE #6 (236)) by higher layer signaling. PSCCH can be used for transmission and reception of sidelink control information (SCI) and can be set to UE (e.g., UE #5 (235), UE #6 (236)) by higher layer signaling. there is.

PSDCH can be used for discovery procedures. For example, the discovery signal may be transmitted via PSDCH. PSBCH can be used for transmission and reception of broadcast information (eg, system information). Additionally, a demodulation reference signal (DMRS), a synchronization signal, etc. may be used in sidelink communication between UE #5 (235) and UE #6 (236). The synchronization signal may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

Meanwhile, sidelink transmission mode (TM) can be classified into sidelink TM #1 to #4 as shown in Table 2 below.

If sidelink TM #3 or #4 is supported, UE #5 (235) and UE #6 (236) each perform sidelink communication using the resource pool set by the base station 210. You can. A resource pool can be set up for each of sidelink control information or sidelink data.

A resource pool for sidelink control information may be set based on an RRC signaling procedure (e.g., dedicated RRC signaling procedure, broadcast RRC signaling procedure). The resource pool used for receiving sidelink control information can be set by the broadcast RRC signaling procedure. If sidelink TM #3 is supported, the resource pool used for transmission of sidelink control information can be set by a dedicated RRC signaling procedure. In this case, sidelink control information may be transmitted through resources scheduled by the base station 210 within a resource pool established by a dedicated RRC signaling procedure. If sidelink TM #4 is supported, the resource pool used for transmission of sidelink control information can be set by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, the sidelink control information is autonomously selected by the UE (e.g., UE #5 (235), UE #6 (236)) within the resource pool established by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure. Can be transmitted through resources.

If sidelink TM #3 is supported, the resource pool for transmission and reception of sidelink data may not be set. In this case, sidelink data can be transmitted and received through resources scheduled by the base station 210. If sidelink TM #4 is supported, the resource pool for transmission and reception of sidelink data can be established by a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, the sidelink data uses resources autonomously selected by the UE (e.g., UE #5 (235), UE #6 (236)) within the resource pool established by the RRC signaling procedure or the broadcast RRC signaling procedure. It can be sent and received through.

Next, sidelink communication methods will be described. Even when a method (e.g., transmission or reception of a signal) performed in a first communication node among communication nodes is described, the corresponding second communication node is described as a method (e.g., transmitting or receiving a signal) corresponding to the method performed in the first communication node. For example, reception or transmission of a signal) can be performed. In other words, when the operation of UE #1 (e.g., vehicle #1) is described, the corresponding UE #2 (e.g., vehicle #2) may perform the operation corresponding to the operation of UE #1. You can. Conversely, when the operation of UE #2 is described, the corresponding UE #1 may perform the operation corresponding to the operation of UE #2. In the embodiments described below, the operation of the vehicle may be the operation of a communication node located in the vehicle.

The sidelink signal may be a synchronization signal and a reference signal used 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), DMRS, phase tracking-reference signal (PT-RS), cell specific reference signal (CRS), sounding reference signal (SRS), discovery reference signal (DRS), etc. You can.

The sidelink channel may be PSSCH, PSCCH, PSDCH, PSBCH, physical sidelink feedback channel (PSFCH), etc. Additionally, the sidelink channel may refer to a sidelink channel that includes a sidelink signal mapped to specific resources within the sidelink channel. Sidelink communication may support broadcast service, multicast service, groupcast service, and unicast service.

The base station may transmit system information (e.g., SIB12, SIB13, SIB14) and an RRC message including configuration information (e.g., sidelink configuration information) for sidelink communication to the UE(s). The UE can receive system information and an RRC message from the base station, check sidelink configuration information included in the system information and RRC message, and perform sidelink communication based on the sidelink configuration information. SIB12 may include sidelink communication/discovery configuration information. SIB13 and SIB14 may include configuration information for V2X sidelink communication.

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

Additionally, the base station can set a resource pool to the UE using higher layer signaling. Upper layer signaling may include SL-BWP-PoolConfig , SL-BWP-PoolConfigCommon , SL-BWP-DiscPoolConfig , and/or SL-BWP-DiscPoolConfigCommon . SL-BWP-PoolConfig can be used to configure the sidelink communication resource pool. SL-BWP-PoolConfigCommon can be used to configure a cell-specific sidelink communication resource pool. SL-BWP-DiscPoolConfig can be used to configure a resource pool dedicated to UE-specific sidelink discovery. SL-BWP-DiscPoolConfigCommon can be used to configure a resource pool dedicated to cell-specific sidelink discovery. The UE can perform sidelink communication within the resource pool set by the base station.

Sidelink communication may support SL DRX (discontinuous reception) operation. The base station may transmit a higher layer message (eg, SL-DRX-Config ) containing SL DRX related parameter(s) to the UE. The UE can perform SL DRX operation based on SL-DRX-Config received from the base station. Sidelink communication may support inter-UE coordination operations. The base station may transmit a higher layer message (eg, SL-InterUE-CoordinationConfig ) containing inter-UE coordination parameter(s) to the UE. The UE may perform inter-UE coordination operations based on SL-InterUE-CoordinationConfig received from the base station.

Sidelink communication can be performed based on a single SCI method or a multi-SCI method. When a single SCI method is used, data transmission (e.g., sidelink data transmission, sidelink-shared channel (SL-SCH) transmission) is performed based on one SCI (e.g., 1 ^st -stage SCI) It can be. When a multiple SCI method is used, data transmission may be performed using two SCIs (e.g., 1 ^st -stage SCI and 2 ^nd -stage SCI). SCI may be transmitted via PSCCH and/or PSSCH. If a single SCI method is used, SCI (e.g., 1 ^st -stage SCI) may be transmitted on PSCCH. When the multiple SCI method is used, 1 ^st -stage SCI can be transmitted on PSCCH, and 2 ^nd -stage SCI can be transmitted on PSCCH or PSSCH. 1 ^st -stage SCI may be referred to as “first stage SCI” and 2 ^nd -stage SCI may be referred to as “second stage SCI”. The first level SCI format may include SCI Format 1-A, and the second level SCI format may include SCI Format 2-A, SCI Format 2-B, and SCI Format 2-C.

SCI format 1-A can be used for scheduling PSSCH and second stage SCI. SCI format 1-A includes priority information, frequency resource assignment information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) pattern information, and second stage. SCI format information, beta_offset indicator, number of DMRS ports, MCS (modulation and coding scheme) information, additional MAC table indicator, PSFCH overhead indicator, or conflict information receiver flag. ) may include at least one of the following.

SCI format 2-A can be used for decoding of PSSCH. SCI format 2-A includes HARQ processor number, new data indicator (NDI), redundancy version (RV), source ID, destination ID, HARQ feedback enabled/disabled. It may include at least one of an indicator, a cast type indicator, or a CSI request.

SCI format 2-B can be used for decoding of PSSCH. SCI format 2-B includes at least one of HARQ processor number, NDI, RV, source ID, destination ID, HARQ feedback enable/disable indicator, zone ID, or communication range requirement. can do.

SCI format 2-C can be used for decoding of PSSCH. Additionally, SCI format 2-C can be used to provide or request inter-UE coordination information. SCI format 2-C may include at least one of a HARQ processor number, NDI, RV, source ID, destination ID, HARQ feedback enable/disable indicator, CSI request, or providing/requesting indicator. there is.

If 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 is resource combinations, first resource location, reference slot location, resource set type, or lowest subchannel index. It may further include at least one of the lowest subchannel indices.

If the value of the provide/request indicator is set to 1, this may indicate that SCI format 2-C is used to request inter-UE coordination information. In this case, SCI format 2-C includes priority, number of subchannels, resource reservation period, resource selection window location, resource set type, or padding. It may contain at least one more bit.

Meanwhile, sidelink (SL) communication can support beam management operations. Beam management operations may be supported in the FR2 band. In the present disclosure, a beam management operation may mean an operation including a beam tracking operation. The beam management operation may be performed based on at least one of aperiodic channel state information (CSI) reporting, periodic CSI reporting, or semi-persistent CSI reporting. The 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 reporting based on the SCI.

The first terminal may transmit CSI-RS (eg, CSI-RS for beam management) in each symbol belonging to the SL slot. The first terminal may transmit CSI-RS based on a beam sweeping operation. In other words, the first terminal may transmit the CSI-RS using different beams (eg, different transmission beams) in each of the symbols belonging to the SL slot. The second terminal can receive CSI-RS from the first terminal. CSI-RS reception operation may be performed based on beam sweeping operation. For example, the second terminal may perform a reception operation for CSI-RS using different beams (eg, different reception beams). When transmission and reception of a CSI-RS (eg, a reference signal) is performed based on a beam sweeping operation, resources for transmission and reception of the CSI-RS may not be sufficient.

When resources for a beam sweeping operation for a reference signal are allocated, symbols (eg, PSSCH symbols) for transmission of SL data may be insufficient. Therefore, in SL communication, a beam management operation based on a signal (eg, synchronization signal) other than the reference signal may be necessary.

Beam management operation in NR Uu link can be defined as follows.

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

■ CQI (channel quality indicator) metric for beam: L1-RSRP (reference signal received power)

■ Maximum number of reportable CSIs per terminal: 4 (for example, CSI reporting for 4 beams is possible)

■ Reporting information: The largest L1-RSRP among the L1-RSRPs of the beams and/or the difference between the L1-RSRP of the remaining beams and the largest L1-RSRP

■ CSI-RS transmission type: CSI reporting type + channel used for CSI reporting

- Periodic type: Periodic CSI report + PUCCH (physical uplink control channel)

- Semi-static type: periodic CSI reporting + PUCCH or semi-static CSI reporting + PUSCH (physical uplink shared channel)

- Aperiodic type: Aperiodic CSI reporting (e.g., aperiodic CSI reporting triggered by a DCI with a CSI request field) + PUSCH

■ Beam adjustment can be performed for each of the downlink transmission and reception beams. If beam reciprocity is satisfied between uplink and downlink, beam management operations (e.g., beam steering operations) can be performed only for downlink.

CSI-related operations in the NR SL link can be defined as follows.

■ Signals used for CSI measurement: CSI-RS set

■ CQI metric: L1-RSRP

■ Maximum CSI-RS port: 2

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

In NR communication, sidelink-synchronization signal block (S-SSB)-related operations can be defined as follows.

■ Unlike SSB transmission in the NR Uu link, S-SSB transmission in the NR SL link can be performed in a fixed cycle. The fixed period may be 160ms.

■ Referring to Table 3 below, transmission of multiple S-SSBs may be possible depending on FR (frequency range) and/or SCS (subcarrier spacing) in one S-SSB section.

In SL communication, S-SSB can be used for beam management (e.g., beam quality measurement) for beams (e.g., transmission beam and/or reception beam) between the transmitting terminal and the receiving terminal. In other words, beam management operations can be performed using S-SSB.

In the present disclosure, a terminal that transmits S-SSB to measure information about a beam may be referred to as a transmitting terminal (or, a first terminal), and a terminal that receives the S-SSB may be referred to as a receiving terminal (or, a second terminal. ) can be referred to as. The receiving terminal may acquire (eg, measure) beam information based on the S-SSB and, if necessary, report the beam information to the transmitting terminal. Beam information measured by the receiving terminal may be defined as beam state information (BSI). For example, BSI may include the index of a specific beam, beam quality information (e.g., RSRP, reference signal received quality (RSRQ), received signal strength indicator (RSSI), etc.), and/or measurements of beam quality (e.g., For example, it may include calculation results for RSRP, RSRQ, RSSI, etc.).

Figure 9 is a conceptual diagram showing the first embodiment of S-SSB.

Referring to FIG. 9, the S-SSB may include a primary synchronization signal (S-PSS), a secondary synchronization signal (S-SSS), and a PSBCH. S-SSB may further include PSBCH DMRS. PSBCH DMRS may be a DMRS used for demodulation of PSBCH. S-SSB can be transmitted within one slot. In the S-SSB shown in FIG. 9, a normal cyclic prefix (CP) can be applied. In the present disclosure, the S-SSB shown in FIG. 9, the S-SSB modified for the S-SSB shown in FIG. 9, the extended S-SSB for the S-SSB shown in FIG. 9, and/or the S-SSB shown in FIG. 9 A combined S-SSB for the S-SSB shown in can be used.

Referring to FIG. 10, one or more S-SSBs may be transmitted in the S-SSB interval. The period of the S-SSB section may be 160ms. The period of the S-SSB section may be a fixed period. The time offset from the start time of the S-SSB interval to the transmission time of the first S-SSB and/or the time interval between S-SSBs can be set in the terminal(s) through signaling. The UE may transmit S-SSB(s) in various ways depending on time offset and/or time interval. In the present disclosure, an S-SSB section shown in FIG. 10, a modified S-SSB section for the S-SSB section shown in FIG. 10, an extended S-SSB section for the S-SSB section shown in FIG. 10, and/or a combined S-SSB interval for the S-SSB interval shown in FIG. 10 may be used.

FIG. 11 is a flowchart showing a first embodiment of a beam management method, and FIG. 12 is a flowchart showing a second embodiment of a beam management method.

Referring to Figures 11 and 12, the transmitting terminal may transmit a BSI (beam state information) request to the receiving terminal (S1101, S1201). The receiving terminal may receive a BSI request from the transmitting terminal. A BSI request may indicate S-SSB transmission for BSI measurement. When a BSI request is received from a sending terminal, the receiving terminal receives S-SSB(s) (e.g., S-SSB(s) according to a BSI request or S-SSB(s) associated with a BSI request) from the sending terminal. It can be judged as being transmitted. After transmitting the BSI request, the transmitting terminal may transmit S-SSB(s) to the receiving terminal (S1101, S1201). S-SSB transmission(s) may be triggered by a BSI request. S-SSB(s) may be associated with the BSI request. For example, the S-SSB(s) may be S-SSB(s) for beam management operations, such that the S-SSB(s) for beam management operations are distinct from the S-SSB(s) for synchronization. can be set. Alternatively, the S-SSB(s) for beam management operation may be the same as the S-SSB(s) for synchronization.

The transmitting terminal can transmit S-SSBs based on a beam sweeping method. In other words, the transmitting terminal can transmit S-SSBs using different beams. The receiving terminal may receive S-SSB(s) from the transmitting terminal and perform a measurement operation for the beam (eg, BSI measurement operation) based on the S-SSB(s). In the embodiment of FIG. 11, the receiving terminal can generate a BSI, which is a measurement result for the beam, and report the BSI to the transmitting terminal (S1103). The transmitting terminal can receive the BSI from the receiving terminal and perform beam management operations based on the BSI. For example, the transmitting terminal can change or maintain the transmission beam based on the BSI. In the embodiment of FIG. 12, the receiving terminal may not perform BSI reporting.

The BSI request may be transmitted to the receiving terminal through signaling (e.g., RRC signaling, MAC signaling (e.g., MAC CE), and/or PHY signaling (e.g., SCI)). The BSI request may include all or partial information about the S-PSS and/or S-SSS included in the S-SSB. The BSI request may include all or part of the information of the sidelink synchronization signal (SLSS) ID (identifier) for identifying the S-SSB transmitted by the transmitting terminal. The transmitting terminal can determine the SLSS ID using a SLSS ID generation method classified according to priority level. The priority level may be determined depending on the location of the terminal (eg, within or outside the coverage of the base station) and/or the type of synchronization source.

The BSI request may include configuration information of the S-SSB. The configuration information of S-SSB includes full or partial information of the time resource(s) through which S-SSB is transmitted, complete or partial information of frequency resource(s) through which S-SSB is transmitted, and transmission interval between S-SSBs. It may include at least one of information or information about the transmission period of S-SSB. The BSI request is a time offset from the transmission time of the BSI request to the start time of the slot in which the first S-SSB (e.g., the first S-SSB transmission among S-SSB transmissions triggered by the BSI request) is transmitted. may include information. The BSI request is transmitted from the start time of the S-SSB interval after the BSI request to the first S-SSB within the S-SSB interval (e.g., the first S-SSB transmission among S-SSB transmissions triggered by the BSI request). ) may include information on the time offset up to the transmission time. The start time of the slot where S-SSB is transmitted and/or the start time of the slot where the S-SSB section begins is determined by the setting value of the SFN (system frame number), DFN (direct frame number), and/or the S-SSB section. It can be confirmed based on

The BSI request may include information on the number of S-SSBs transmitted within one S-SSB interval and/or information on the time interval between S-SSBs within one S-SSB interval. The BSI request may indicate whether to report information (e.g., BSI) about the measured beam based on S-SSB(s). The report indicator indicating whether to perform BSI reporting may have a size of 1 bit. A reporting indicator set to a first value (eg, 0) may indicate not performing BSI reporting. In this case, the receiving terminal may not transmit the BSI to the transmitting terminal, and the transmitting terminal may not expect to receive the BSI from the receiving terminal. The reporting indicator set to a second value (eg, 1) may indicate performing BSI reporting. In this case, the receiving terminal can transmit the BSI to the transmitting terminal, and the transmitting terminal can expect to receive the BSI from the receiving terminal.

BSI requests may be transmitted via PSCCH and/or PSSCH. For example, a BSI request may be included in SCI and/or MAC CE. BSI reporting can be activated or deactivated. If BSI reporting is activated by SCI or MAC CE, the receiving terminal can perform BSI reporting for the BSI request. If BSI reporting is disabled by SCI or MAC CE, the receiving terminal may not perform BSI reporting for the BSI request. Alternatively, whether to perform BSI reporting (eg, BSI reporting for BSI requests) may be preset. Whether to perform BSI reporting may be preset by SI signaling and/or RRC signaling. Whether to perform BSI reporting can be set as RP (resource pool)-specific, SL-specific, and/or UE-specific.

When the BSI request includes information indicating performing BSI reporting, in the embodiment of FIG. 11, the receiving terminal may measure the transmission beam(s) of the transmitting terminal based on the S-SSB, and the transmission beam(s) ) can be reported to the transmitting terminal. When the BSI request includes information indicating not to perform BSI reporting, in the embodiment of FIG. 12, the receiving terminal may measure the received beam(s) based on the S-SSB, and Measurement information (for example, BSI) may not be reported to the transmitting terminal.

The BSI request may include information indicating a measurement operation of a transmission beam and/or a measurement operation of a reception beam, and the information included in the BSI request may implicitly indicate whether to perform BSI reporting. If the BSI request includes information indicating a measurement operation of a reception beam (eg, a reception beam of the receiving terminal), the receiving terminal may not perform BSI reporting. In other words, information indicating the measurement operation of the reception beam may implicitly indicate that BSI reporting is not performed. If the BSI request includes information indicating a measurement operation of a transmission beam (eg, a transmission beam of the transmitting terminal), the receiving terminal may perform BSI reporting. In other words, information indicating a measurement operation of a transmission beam may implicitly indicate performing BSI reporting.

Alternatively, the information indicating whether to perform BSI reporting included in the BSI request may implicitly indicate the measurement operation of the transmission beam and/or the measurement operation of the reception beam. If the BSI request includes information indicating performing BSI reporting, the receiving terminal may perform a measurement operation of the transmission beam(s) of the transmitting terminal, and measurement information of the transmission beam(s) (e.g., BSI) can be reported to the transmitting terminal. In other words, information indicating performing BSI reporting may implicitly indicate performing a measurement operation of a transmission beam. If the BSI request includes information indicating not to perform BSI reporting, the receiving terminal may perform a measurement operation of the receiving beam(s) of the receiving terminal, and send the measurement information of the receiving beam(s) to the transmitting terminal. You may not report it. In other words, information indicating not to perform BSI reporting may implicitly indicate to perform a measurement operation of a reception beam. The measurement operation of the reception beam can be performed by sweeping the reception beams of the receiving terminal.

Whether to perform a measurement operation of a transmission beam, whether to perform a measurement operation of a reception beam, and/or whether to perform a BSI report may be set in advance before transmitting a BSI request. In this case, modified embodiments of the above-described embodiments, extended embodiments of the above-described embodiments, and/or combined embodiments of the above-described embodiments may be used. Whether to perform a measurement operation of a transmission beam, whether to perform a measurement operation of a reception beam, and/or whether to perform BSI reporting may be preset by SI signaling, RRC signaling, and/or MAC signaling. The above-described embodiments may be performed based on configuration by SI signaling, RRC signaling, and/or MAC signaling.

When a measurement operation for the transmission beam of the transmitting terminal is performed, the receiving terminal may report measurement information (eg, BSI) about the transmission beam to the transmitting terminal. When a measurement operation for the reception beam of the receiving terminal is performed, the receiving terminal may not report measurement information about the reception beam to the transmitting terminal. Since measurement information about the reception beam is not used by the transmitting terminal, measurement information about the reception beam may not be transmitted to the transmitting terminal. The receiving terminal can change or maintain the receiving beam based on measurement information about the receiving beam. In other words, the receiving terminal can perform a beam management operation based on measurement information about the received beam.

Information indicating the measurement operation for the transmission beam of the transmitting terminal may be separated from information indicating whether to report the measurement result (eg, the result of the measurement operation). Information indicating a measurement operation for a receiving beam of a receiving terminal may be separated from information indicating whether to report a measurement result (eg, a result of a measurement operation). For the indication operation, an indicator with a size of 2 bits can be used. For example, one bit of the indicator may indicate performance of a measurement operation for a transmission beam or a measurement operation for a reception beam, and another bit of the indicator may indicate whether to perform BSI reporting. The indicator can be defined as shown in Table 4 below.

The indicators in Table 4 may be transmitted by signaling (e.g., RRC signaling, MAC signaling, and/or PHY signaling). Modified directives for the directives in Table 4, extended directives for the directives in Table 4, and/or combined directives for the directives in Table 4 may be used.

The BSI request may include information on the number of S-SSB sections. In other words, the information included in the BSI request may limit the number of S-SSBs transmitted for beam measurement (eg, BSI measurement). For example, if "the information included in the BSI request indicates two S-SSB sections, and four S-SSB transmissions are indicated in each of the two S-SSB sections," the transmitting terminal Eight S-SSBs can be transmitted, and the receiving terminal can perform a measurement operation on the eight S-SSBs. The BSI request may include an indicator indicating the number of S-SSB sections, the size of the indicator may be 2 bits, and the indicator indicates 2, 4, 6, or 8 as the number of S-SSB sections. can do. The indicator may indicate various numbers of S-SSB sections. The indicator can be set in various forms.

The receiving terminal can measure beam information based on the S-SSB transmitted by the transmitting terminal and report the BSI including the measurement result of the beam information to the transmitting terminal. If a BSI report is received from the receiving terminal, the sending terminal may stop S-SSB transmission. If it is determined that additional measurement of beam information is not necessary, S-SSB transmission may be stopped. To support the above operation, the BSI transmitted by the receiving terminal may include not only beam measurement information but also information indicating whether S-SSB transmission is interrupted. If the information included in the BSI indicates interruption of S-SSB transmission, the transmitting terminal may stop S-SSB transmission after receiving the BSI. If the information included in the BSI indicates that S-SSB transmission is not interrupted, the transmitting terminal can perform S-SSB transmission after receiving the BSI.

Alternatively, in the procedure where the transmitting terminal sets up S-SSB transmission for BSI measurement, “no additional S-SSB transmission is performed after the BSI report is received” may be set. “No additional S-SSB transmission is performed after the BSI report is received” may be set by BSI reporting and/or higher layer signaling. The above operation can be applied in the same or similar manner even when the number of S-SSB sections is not set (for example, when periodic S-SSB transmission is performed).

The BSI request may include information on the number of S-SSBs and/or S-SSB groups measured for BSI reporting. In other words, the BSI request may include range information of the S-SSB(s) measured for BSI reporting. The BSI request may include beam pattern information for the beam(s) transmitting the S-SSB(s).

Referring to FIG. 13, the transmitting terminal may transmit a BSI request to the receiving terminal (S1301). The receiving terminal can receive a BSI request from the transmitting terminal and check the information element(s) included in the BSI request. When a BSI request is received, the receiving terminal can expect the S-SSB(s) associated with the BSI request to be transmitted. The transmitting terminal may transmit S-SSBs to the receiving terminal after transmitting the BSI request (S1302). S-SSBs may be associated with a BSI request. S-SSB transmissions can be triggered by a BSI request. The receiving terminal may perform a measurement operation on a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s), and BSI including the result of the measurement operation. can be created. In other words, the receiving terminal can perform a measurement operation for S-SSB(s) falling within a preset range.

The receiving terminal can report the BSI to the transmitting terminal (S1303). The transmitting terminal can receive BSI from the receiving terminal. The transmitting terminal can perform beam management operations based on BSI. After the BSI is received from the receiving terminal, the transmitting terminal may transmit S-SSBs to the receiving terminal (S1304). The receiving terminal may perform a measurement operation on a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s), and BSI including the result of the measurement operation. can be created. The receiving terminal may report the BSI to the transmitting terminal (S1305). The transmitting terminal can perform beam management operations based on BSI.

“If it is set that beam information (e.g., BSI) is measured for each unit of S-SSB section(s) and BSI reporting is performed for each unit of S-SSB section(s),” the receiving terminal is connected to the S-SSB The measured BSI can be reported for each unit of section(s). “When it is set that beam information (e.g., BSI) is measured for each unit of four S-SSB sections and BSI reporting is performed for each unit of four S-SSB sections,” the receiving terminal is configured to measure four S-SSB sections. The BSI measured for each section can be reported. The S-SSB range measured for BSI reporting can be set in units of S-SSB section(s), units of S-SSB(s), units of slot(s), configurable units, and/or a combination of units. You can.

Referring to FIG. 14, the transmitting terminal may transmit a BSI request to the receiving terminal (S1401). The receiving terminal can receive a BSI request from the transmitting terminal and check the information element(s) included in the BSI request. When a BSI request is received, the receiving terminal can expect S-SSB(s) associated with the BSI request to be transmitted from the receiving terminal. The transmitting terminal may transmit S-SSBs to the receiving terminal (S1402). The receiving terminal may perform a measurement operation on a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s), and BSI including the result of the measurement operation. can be created. In other words, the receiving terminal can perform a measurement operation for S-SSB(s) falling within a preset range.

If not performing BSI reporting is set, the receiving terminal may not report the BSI to the transmitting terminal. In other words, even if it is set not to perform BSI reporting, the measurement operation of BSI for a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s) Performance can be directed.

Additionally, the transmitting terminal may transmit S-SSBs to the receiving terminal (S1403). A BSI measurement operation for a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s) may be performed at the receiving terminal. For BSI measurement, a preset number of S-SSB(s) or S-SSB(s) within a preset number of S-SSB section(s) may be referred to as an S-SSB group. In the embodiment of FIG. 13 and/or FIG. 14, it may be possible to indicate whether to perform BSI reporting for each S-SSB group.

Referring to FIG. 15, performing BSI reporting for the first S-SSB group may be instructed or configured in the terminal(s), and not performing BSI reporting for the second S-SSB group may be instructed or configured by the terminal(s). ) may be indicated or set. If the indication of whether to perform BSI reporting implicitly indicates a measurement operation on the transmit beam or a measurement operation on the receive beam, the measurement operation on the transmit beam for the first S-SSB group will be implicitly indicated. and the measurement operation for the reception beam for the second S-SSB group may be implicitly indicated. Alternatively, the measurement operation for the transmission beam or the measurement operation for the reception beam for each S-SSB group may be explicitly instructed, and the transmitting terminal and/or the receiving terminal may operate regardless of whether BSI reporting is performed. there is.

The transmitting terminal may transmit a BSI request to the receiving terminal (S1501). The receiving terminal can receive a BSI request from the transmitting terminal and check the information element(s) included in the BSI request. When a BSI request is received, the receiving terminal can expect S-SSB(s) associated with the BSI request to be transmitted from the transmitting terminal. The transmitting terminal may perform transmission of the first S-SSB group (S1502). The receiving terminal can perform a measurement operation for the first S-SSB group and generate a BSI including the results of the measurement operation. In “when a measurement operation for the transmission beam of the transmitting terminal is instructed” or “when performing BSI reporting is instructed”, the receiving terminal may report the BSI to the transmitting terminal (S1503).

The transmitting terminal can receive BSI from the receiving terminal. The transmitting terminal can perform beam management operations based on BSI. For example, the transmitting terminal may maintain or change the transmission beam based on the BSI. After the BSI is received from the receiving terminal, the transmitting terminal may perform transmission for the second S-SSB group (S1504). The receiving terminal can perform a measurement operation for the second S-SSB group. In “when a measurement operation for the reception beam of the receiving terminal is indicated” or “when not performing BSI reporting is indicated”, the receiving terminal may not report the BSI to the transmitting terminal. When the receiving terminal is instructed to perform a measurement operation on the received beam, the receiving terminal may perform a measurement operation on the received beam based on the second S-SSB group. A measurement operation for a received beam may be performed based on a beam sweeping method. The receiving terminal may change or maintain the receiving beam based on the measurement results for the second S-SSB group.

Different beam patterns can be applied to each of the S-SSB groups or S-SSB sections. The transmitting terminal may perform transmission of S-SSB group(s) using different beam patterns. The receiving terminal may perform a reception operation for the S-SSB group(s) using different beam patterns. The transmitting terminal can transmit S-SSB in S-SSB sections using different beam patterns. The receiving terminal can perform a reception operation for S-SSBs in S-SSB sections using different beam patterns.

Setting information of the S-SSB group, information indicating whether to perform a measurement operation on the transmission beam for each S-SSB group, information indicating whether to perform a measurement operation on the reception beam for each S-SSB group, Information indicating whether to perform BSI reporting for each S-SSB group, transmission beam pattern information, and/or reception beam pattern information may be included in the BSI request. Setting information of the S-SSB group, information indicating whether to perform a measurement operation on the transmission beam for each S-SSB group, information indicating whether to perform a measurement operation on the reception beam for each S-SSB group, Information indicating whether to perform BSI reporting for each S-SSB group, transmission beam pattern information, and/or reception beam pattern information may be transmitted by at least one of RRC signaling, MAC signaling, or PHY signaling.

Referring to FIG. 16, after transmission of one BSI request, the entire S-SSB section for beam measurement may be set to be the same as one S-SSB group. In this case, the transmitting terminal may transmit a BSI request for each S-SSB group. For example, the transmitting terminal may transmit BSI request #1 for S-SSB group #1 and BSI request #2 for S-SSB group #2. When BSI reporting is instructed, the receiving terminal can report the BSI measured for one S-SSB group to the transmitting terminal. Performance of BSI reporting for BSI request #1 may not be directed, and performance of BSI reporting for BSI request #2 may be directed. The receiving terminal may report the BSI measured for S-SSB group #2 to the transmitting terminal.

The transmitting terminal may transmit BSI request #1 to the receiving terminal (S1601). The receiving terminal can receive BSI request #1 from the transmitting terminal and check the information element(s) included in BSI request #1. When BSI Request #1 is received, the receiving terminal can expect transmission of S-SSB Group #1 associated with BSI Request #1 to be performed at the transmitting terminal. The transmitting terminal can perform transmission for S-SSB group #1 (S1602). The receiving terminal can perform a measurement operation for S-SSB group #1. If performance of BSI reporting for S-SSB group #1 is not instructed, the receiving terminal may not report the result of the measurement operation (eg, BSI) for S-SSB group #1 to the transmitting terminal.

The transmitting terminal may transmit BSI request #2 to the receiving terminal (S1603). The receiving terminal can receive BSI Request #2 from the transmitting terminal and check the information element(s) included in BSI Request #2. When BSI Request #2 is received, the receiving terminal can expect transmission of S-SSB Group #2 associated with BSI Request #2 to be performed at the transmitting terminal. The transmitting terminal can perform transmission for S-SSB group #2 (S1604). The receiving terminal can perform measurement operations for S-SSB group #2. When performing BSI reporting for S-SSB group #2 is instructed, the receiving terminal may report the result of the measurement operation (e.g., BSI) for S-SSB group #2 to the transmitting terminal (S1605) . The transmitting terminal can receive the BSI measured for S-SSB group #2 from the receiving terminal. The transmitting terminal can change or maintain the transmission beam based on the BSI.

In the present disclosure, all or part of the information element(s) that may be included in the BSI request may be established by higher layer signaling (e.g., SI signaling, RRC signaling, and/or MAC signaling). In this case, modified embodiments of the above embodiments, extended embodiments of the above embodiments, and/or combined embodiments of the above embodiments may be performed.

A transmitting terminal that transmits S-SSB for beam measurement may be a synchronous terminal (eg, a synchronous reference terminal). A synchronization terminal (eg, a transmitting terminal) may transmit S-SSB for synchronization with the receiving terminal. When an S-SSB-based beam management operation is performed, the receiving terminal may regard the transmitting terminal as a synchronization terminal, obtain synchronization information based on the S-SSB received from the transmitting terminal, and correct synchronization. can do. In other words, the receiving terminal can synchronize with the transmitting terminal based on the S-SSB received from the transmitting terminal.

In the above embodiment, the triggering signal for beam measurement operation and/or BSI reporting may be a BSI request from the transmitting terminal. The condition(s) for the transmitting terminal to transmit the BSI request is determined by the terminal(s) (e.g., the transmitting terminal and/or the receiving terminal) by higher layer signaling (e.g., SI signaling, RRC signaling, and/or MAC signaling). terminal) can be set. If the condition(s) set by higher layer signaling is satisfied, the transmitting terminal can transmit a BSI request. If the condition(s) set by upper layer signaling are satisfied, the receiving terminal can expect the transmitting terminal to transmit a BSI request.

For example, “if the quality of SL communication (e.g., beam-based SL communication) is below the threshold” and/or “the measurement result for the reference signal (e.g., CSI-RS) transmitted by the transmitting terminal is “If it is below the threshold,” the transmitting terminal may transmit a BSI request for triggering a beam management operation. The transmitting terminal may transmit S-SSB(s) after transmitting the BSI request. Beam management operations may be performed based on measurement results for S-SSB(s). The quality (e.g., measurement result) for the beam may be RSRP, RSRQ, RSSI, etc. Alternatively, the quality for a beam may be the result of specific operations on RSRP, RSRQ, and/or RSSI.

Referring to FIG. 17, the receiving terminal may transmit a BM (beam management) request to the transmitting terminal (S1701). The BM request may include information indicating whether beam management operation is required. If it is determined that a beam management operation is necessary, the receiving terminal may transmit a BM request to the transmitting terminal. The BM request may include information indicating that beam management operations are required. The beam measurement operation and/or BSI reporting operation may be triggered by the receiving terminal (eg, BM request of the receiving terminal). The BM request may be transmitted via PSCCH and/or PSSCH. In this case, the BM request may be included in the SCI and/or MAC CE. Alternatively, the BM request may be transmitted via PSFCH. The size of the BM request may be 1 bit. When a BM request is transmitted via PSFCH, the BM request may be set in the form of a preset sequence requesting performance of a BM operation. When the BM request is indicated with 1 bit of information, a BM request set to a first value (eg, 0) may indicate that a beam management operation is not required. A BM request set to a second value (e.g., 1) may indicate that a beam management operation is required. The transmitting terminal may receive a BM request from the receiving terminal. When a BM request is received from the receiving terminal, the transmitting terminal may determine that a beam management operation is necessary. Alternatively, the transmitting terminal may determine that a beam management operation is necessary based on information included in the BM request. Therefore, the transmitting terminal can transmit a BSI request to the receiving terminal (S1702).

The receiving terminal can receive a BSI request from the transmitting terminal and check the information element(s) included in the BSI request. When a BSI request is received, the receiving terminal can expect to receive S-SSB(s) associated with the BSI request from the transmitting terminal. After transmitting the BSI request, the transmitting terminal may transmit S-SSB(s) to the receiving terminal (S1703). The receiving terminal can perform a measurement operation on the S-SSB(s) of the transmitting terminal and report the BSI including the measurement result to the transmitting terminal (S1704). The transmitting terminal can receive the BSI from the receiving terminal and perform beam management operations based on the BSI. For example, the transmitting terminal may maintain or change the transmission beam based on the BSI. The BM request transmission and reception operation (eg, S1701) may be applied to at least one of the embodiments of FIGS. 11 to 16 described above. Operations after S1701 in the embodiment of FIG. 17 may be the same or similar to operations in at least one of the embodiments of FIGS. 11 to 16 .

Referring to FIG. 18, the S-SSB-based beam management operation can be performed without a BSI request from the transmitting terminal. Configuration values (e.g., all configuration values) for S-SSB transmission for beam management operation are preset to the terminal(s) by signaling (e.g., SI signaling, RRC signaling, and/or MAC signaling) It can be. The transmitting terminal may transmit S-SSB(s) to the receiving terminal(s) without transmitting a BSI request (S1801). A receiving terminal(s) performing SL communication with a transmitting terminal can receive S-SSB from the transmitting terminal and measure beam quality based on the S-SSB. The receiving terminal(s) may report beam quality information (eg, BSI) to the transmitting terminal (S1802). The transmitting terminal can receive BSI from the receiving terminal(s). The transmitting terminal can maintain or change the transmission beam based on the BSI.

Embodiments that are variations on the embodiment of FIG. 18, extended embodiments of the embodiment of FIG. 18, and/or combined embodiments of the embodiment of FIG. 18 may be performed. The combined embodiment may be a combination of the embodiment of FIG. 18 and other embodiment(s) of the present disclosure. The transmitting terminal may be a synchronous terminal (eg, a synchronous reference terminal) for the receiving terminal. Alternatively, the transmitting terminal may be a synchronous terminal that replaces the existing synchronous reference terminal of the receiving terminal. In this case, the receiving terminal may receive S-SSB (e.g., S-SSB for beam management operation) and perform synchronization correction operation, beam quality measurement operation, BSI reporting operation, etc. based on the S-SSB. can do.

In this disclosure, S-SSB for beam management operation can be distinguished from S-SSB for synchronization. In this case, S-SSB for beam management operation and/or S-SSB for synchronization may be set in the terminal through signaling. The transmission resources (e.g., time resources, frequency resources, transmission period) of the S-SSB for beam management operations may be set differently from the transmission resources of the S-SSB for synchronization. Alternatively, the S-SSB for beam management operation may be the same as the S-SSB for synchronization.

The operation of the method according to the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store information that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner.

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

Although some aspects of the disclosure have been described in the context of an apparatus, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, programmable computer, or electronic circuit. In some embodiments, at least one or more of the most important method steps may be performed by such a device.

A programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functionality of the methods described in this disclosure. A field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in this disclosure. In general, it is desirable for the methods to be performed by some hardware device.

Although the present disclosure has been described above with reference to preferred embodiments, those skilled in the art may modify and change the present disclosure in various ways without departing from the spirit and scope of the present disclosure as set forth in the claims below. You will understand that it is possible.

Claims

As a method of a first UE (user equipment),

Transmitting a beam state information (BSI) request to a second UE;

Transmitting first sidelink-synchronization signal blocks (S-SSBs) according to the BSI request to the second UE; and

Comprising receiving a first BSI measured based on the first S-SSBs from the second UE,

Method of first UE.
In claim 1,

The BSI request includes configuration information of the first S-SSBs, and the configuration information includes at least one of time resource information, frequency resource information, or transmission period information of the first S-SSBs,

Method of first UE.
In claim 1,

The first S-SSBs are configured for beam management operation, and the first S-SSBs are distinguished from S-SSBs configured for synchronization.

Method of first UE.
In claim 1,

The BSI request includes information indicating whether to perform BSI reporting, and when the information indicates performing the BSI reporting, the first BSI is received from the second UE, and the information is received from the BSI reporting. When indicating not to perform, the first BSI is not received from the second UE,

Method of first UE.
In claim 1,

The BSI request is included in a sidelink control information (SCI), medium access control (MAC) control element (CE), or radio resource control (RRC) message transmitted to the second UE.

Method of first UE.
In claim 1,

The first BSI includes measurement information about the beams of the first UE and information indicating whether S-SSB transmission is interrupted, and when the information indicates interruption of S-SSB transmission, the first BSI After reception, the first UE stops transmitting the S-SSB, and if the information does not indicate stopping the S-SSB transmission, after receiving the first BSI, the first UE performs the S-SSB transmission. ,

Method of first UE.
In claim 1,

The method of the first UE is:

transmitting second S-SSBs to the second UE; and

Further comprising receiving a second BSI measured based on the second S-SSBs from the second UE,

The first S-SSBs are a first S-SSB group, the second S-SSBs are a second S-SSB group, and the BSI measurement operation in the second UE is performed in units of S-SSB groups.

Method of first UE.
In claim 1,

The method of the first UE is:

Further comprising receiving a beam management (BM) request from the second UE,

The BM request includes information indicating whether a beam management operation is necessary, and if the information indicates that the beam management operation is necessary, the first UE transmits the BSI request, and the information indicates that the beam management operation is necessary. The first UE does not transmit the BSI request if it indicates that no action is required.

Method of first UE.
As a method of a second UE (user equipment),

Receiving a beam state information (BSI) request from a first UE;

Receiving first sidelink-synchronization signal blocks (S-SSBs) according to the BSI request from the first UE;

generating a first BSI by performing a beam measurement operation based on the first S-SSBs; and

Including transmitting the first BSI to the first UE,

Method of the second UE.
In claim 9,

The BSI request includes configuration information of the first S-SSBs, and the configuration information includes at least one of time resource information, frequency resource information, or transmission period information of the first S-SSBs,

Method of the second UE.
In claim 9,

The first S-SSBs are configured for beam management operation, and the first S-SSBs are distinguished from S-SSBs configured for synchronization.

Method of the second UE.
In claim 9,

The BSI request includes information indicating whether to perform BSI reporting, and when the information indicates performing the BSI reporting, the second UE transmits the first BSI to the first UE, and The second UE does not transmit the first BSI to the first UE if information indicates not to perform the BSI reporting,

Method of the second UE.
In claim 9,

The BSI request is included in a sidelink control information (SCI), medium access control (MAC) control element (CE), or radio resource control (RRC) message received from the first UE.

Method of the second UE.
In claim 9,

The first BSI includes measurement information about the beams of the first UE and information indicating whether S-SSB transmission is interrupted, and when the information indicates interruption of S-SSB transmission, the first BSI After transmitting, the second UE stops receiving S-SSB, and if the information does not indicate stopping S-SSB transmission, after transmitting the first BSI, the second UE performs the S-SSB reception.

Method of the second UE.
In claim 9,

The method of the second UE is,

Receiving second S-SSBs from the first UE;

generating a second BSI by performing the beam measurement operation based on the second S-SSBs; and

Further comprising transmitting the second BSI to the first UE,

The first S-SSBs are a first S-SSB group, the second S-SSBs are a second S-SSB group, and the second UE performs the beam measurement operation in units of S-SSB groups.

Method of the second UE.
In claim 9,

The method of the second UE is,

Further comprising transmitting a beam management (BM) request to the first UE,

The BM request includes information indicating whether a beam management operation is necessary, and if the information indicates that the beam management operation is necessary, the second UE performs a reception operation for the BSI request, and the information If indicates that the beam management operation is not necessary, the second UE does not perform a reception operation for the BSI request.

Method of the second UE.
As a first user equipment (UE),

Contains at least one processor,

The at least one processor is configured to allow the first UE to:

Send a beam state information (BSI) request to the second UE;

Transmitting first sidelink-synchronization signal blocks (S-SSBs) according to the BSI request to the second UE; and

causing to receive from the second UE a first BSI measured based on the first S-SSBs,

1st U.E.
In claim 17,

The BSI request includes configuration information of the first S-SSBs, and the configuration information includes at least one of time resource information, frequency resource information, or transmission period information of the first S-SSBs, and the first S-SSBs S-SSBs are configured for beam management operation, and the first S-SSBs are distinguished from S-SSBs configured for synchronization.

1st U.E.
In claim 17,

The at least one processor is configured to allow the first UE to:

transmit second S-SSBs to the second UE; and

further cause to receive a second BSI measured based on the second S-SSBs from the second UE,

The first S-SSBs are a first S-SSB group, the second S-SSBs are a second S-SSB group, and the BSI measurement operation in the second UE is performed in units of S-SSB groups.

1st U.E.
In claim 17,

The at least one processor is configured to allow the first UE to:

Further causing to receive a beam management (BM) request from the second UE,

The BM request includes information indicating whether a beam management operation is necessary, and if the information indicates that the beam management operation is necessary, the first UE transmits the BSI request, and the information indicates that the beam management operation is necessary. The first UE does not transmit the BSI request if it indicates that no action is required.

1st U.E.