WO2024091012A1 - Method and device for beam management according to ra mode in sidelink communication - Google Patents

Abstract

A method and a device for beam management according to an RA mode in sidelink communication are disclosed. A method for a first UE comprises the steps of: transmitting, to a base station, an SR-BM requesting resource allocation for a BM operation; receiving, from the base station, a response-SR comprising resource allocation information in response to the SR-BM; and performing the BM operation with a second UE on the basis of resources indicated by the resource allocation information.

Description

Method and apparatus for beam management according to RA mode in sidelink communication

This disclosure relates to sidelink communication technology, and more specifically to beam management technology according to resource allocation (RA) mode.

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 frequency bands 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, sidelink communication between terminals may be performed based on a beamforming method, and beam management operations for sidelink communication may be necessary. Sidelink communication may be performed based on resource allocation (RA) mode 1 or RA mode 2. Specific procedures for beam management operations in RA mode 1 and specific procedures for beam management operations in RA mode 2 may be required.

The purpose of the present disclosure to solve the above problems is to provide a method and device for beam management according to resource allocation (RA) mode in sidelink communication.

The method of the first UE according to embodiments of the present disclosure for achieving the above purpose includes transmitting an SR-BM requesting resource allocation for BM operation to the base station, allocating resources in response to the SR-BM. Receiving a response-SR containing information from the base station, and performing the BM operation with a second UE based on resources indicated by the resource allocation information.

Performing the BM operation includes transmitting a BSI request to the second UE based on the resources indicated by the resource allocation information, and transmitting a BSI request to the second UE based on the resources indicated by the resource allocation information. - Transmitting an RS to the second UE, receiving a BSI report including beam measurement information based on the BM-RS from the second UE, and based on the beam measurement information included in the BSI report It may include managing the transmission beam of the first UE, and the BSI request may trigger transmission of the BSI report.

The BSI request may be included in the SCI transmitted from the first UE to the second UE, and the BM-RS may be transmitted on the PSSCH scheduled by the SCI.

The BM-RP for the BM operation may be set independently of the SL-RP for SL communication between the first UE and the second UE, and includes at least one of the BSI request, the BM-RS, or the BSI report. Can be transmitted and received within the BM-RP.

The pair of the BM-RP and the SL-RP may be set in the first UE, and within the BM-RP, either the transmission beam of the first UE or the reception beam of the second UE determined by the BM operation. At least one may be used for the SL communication between the first UE and the second UE within the SL-RP paired with the BM-RP.

The resource allocation information of the response-SR may include resource information for the SL-RP and resource information for the BM-RP.

The BSI request may include transmission method information of the BM-RS, and the transmission method is “the first UE transmits the BM-RS using the same transmission beam” or “the first UE transmits the BM-RS using the same transmission beam.” “Transmitting the BM-RS based on a beam sweeping method” may be indicated.

The BSI request may include resource information for transmission of the BSI report, and the BSI report may be received from resources indicated by the resource information included in the BSI request.

The method of the first UE may further include receiving a BM request from the second UE indicating that the BM operation is required, and the transmission operation of the SR-BM may be triggered based on the BM request. You can.

The SR-BM may be transmitted when the BM operation is necessary, and when the BM operation is necessary, “when a change in the transmission beam of the first UE is necessary” and “when a change in the reception beam of the second UE is necessary.” At least one of the following: “when necessary”, “when a change in the beam pair between the first UE and the second UE is necessary”, or “when a beam failure occurs between the first UE and the second UE” It can be.

A method of a second UE according to embodiments of the present disclosure for achieving the above purpose includes receiving an SCI including a BSI request from a first UE, receiving a BM-RS in a PSSCH scheduled by the SCI. 1 receiving from a UE, generating beam state information by performing a beam measurement operation based on the BM-RS, transmitting a BSI report including the beam state information to the first UE, and the beam and managing the reception beam of the second UE based on state information.

The BSI request may trigger transmission of the BSI report, the BSI request may include resource information for transmission of the BSI report, and the BSI report may be indicated by the resource information included in the BSI request. It can be transmitted from available resources.

The BM-RP for BM operation may be set independently of the SL-RP for SL communication between the first UE and the second UE, and at least one of the BSI request, the BM-RS, or the BSI report Can be transmitted and received within the BM-RP.

The pair of the BM-RP and the SL-RP may be set in the second UE, and within the BM-RP, either the transmission beam of the first UE or the reception beam of the second UE determined by the BM operation. At least one may be used for the SL communication between the first UE and the second UE within the SL-RP paired with the BM-RP.

The BSI request may include transmission method information of the BM-RS, and the transmission method is “the first UE transmits the BM-RS using the same transmission beam” or “the first UE transmits the BM-RS using the same transmission beam.” “Transmitting the BM-RS based on a beam sweeping method” may be indicated.

The method of the second UE may further include transmitting a BM request indicating that a BM operation is required to the first UE, and the BM operation may be triggered based on the BM request.

The BM request may be transmitted when the BM operation is necessary, and when the BM operation is necessary, “when a change in the transmission beam of the first UE is necessary” or “when a change in the reception beam of the second UE is necessary” It may be at least one of the following: “case”, “case where a beam pair between the first UE and the second UE needs to be changed”, or “case where a beam failure occurs between the first UE and the second UE”.

The first UE according to embodiments of the present disclosure for achieving the above purpose includes at least one processor, and the at least one processor is an SR-BM for which the first UE requests resource allocation for a BM operation. transmits to the base station, receives a response-SR containing resource allocation information in response to the SR-BM from the base station, and bases the resources indicated by the resource allocation information on the second UE and the BM. Causes an action to be performed.

When performing the BM operation, the at least one processor causes the first UE to transmit a BSI request to the second UE based on the resources indicated by the resource allocation information, and to the resource allocation information. transmit a BM-RS to the second UE based on the resources indicated by, receive a BSI report including beam measurement information based on the BM-RS from the second UE, and include it in the BSI report It may cause the transmission beam of the first UE to be managed based on the beam measurement information, and the BSI request may trigger transmission of the BSI report.

The at least one processor may further cause the first UE to receive a BM request from the second UE indicating that the BM operation is required, and the transmission operation of the SR-BM is based on the BM request. Can be triggered.

According to the present disclosure, a transmitting terminal can request resource allocation for a BM (beam management) operation from the base station and receive resource allocation information from the base station. The transmitting terminal can perform a BM operation with the receiving terminal based on resources indicated by resource allocation information. By BM operation, a beam pair between the transmission beam of the transmitting terminal and the reception beam of the receiving terminal can be set. Therefore, sidelink communication between the transmitting terminal and the receiving terminal can be performed efficiently, and the performance of the communication system can be improved.

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 flowchart showing a first embodiment of BM operation.

Figure 10 is a conceptual diagram showing a first embodiment of a BM-RS transmission method.

Figure 11 is a flowchart showing a second embodiment of BM operation.

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 can mean “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 should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present disclosure. 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 PHY (physical) 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.” In this disclosure, information may be used in the sense of information element, field, field value, field information, and/or parameter.

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.

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

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), and AMF (270) 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 and 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.

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

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.

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

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 into 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) in FIG. 1, and UE #6 (236) may indicate a communication node located in vehicle #1 (100) in FIG. 1. The communication node located in vehicle #2 (110) can be indicated. When V2I communication is performed using Cylink communication technology, UE #5 (235) may indicate a communication node located in vehicle #1 (100) in FIG. 1, and UE #6 (236) may indicate a communication node located in vehicle #1 (100) in 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.

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

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 corresponding 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 this disclosure, the beam management operation may be referred to as a beam management (BM) operation. BM operations may be performed using a channel state information-reference signal (CSI-RS). In this case, restrictions on the number of symbols within a transmittable SL (sidelink) slot may occur. For example, enough PSSCH symbols for PSSCH transmission may not be secured. BM operations may be performed using synchronization signal blocks (SSB). In this case, restrictions on SSB transmission may exist. For example, considering SSB transmission, the transmission timing according to the triggering timing for BM operation may be changed. Therefore, inefficiency in SL communication may increase.

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

■ Signals used for CSI measurement: CSI-RS set and/or 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 reporting + PUCCH (physical uplink control channel)

- Semi-persistent 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

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

- 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.

The following terms may be defined for description of BM operations in this disclosure.

■ Sending terminal

A transmitting terminal may refer to a terminal that transmits data (eg, SL data, user data) in SL communication. The transmitting terminal may be referred to as a TX terminal, transmitting UE, or TX UE. For convenience of explanation, the transmitting terminal may be referred to as a first terminal or first UE. In this disclosure, the terminal may be interpreted as a transmitting terminal depending on the context.

■ Receiving terminal

The receiving terminal may refer to a terminal that receives data (eg, SL data, user data) in SL communication. The receiving terminal may be referred to as an RX terminal, receiving UE, or RX UE. For convenience of explanation, the receiving terminal may be referred to as a second terminal or a second UE. In the present disclosure, the terminal may be interpreted as a receiving terminal depending on the context.

■ BM-RS(beam management-reference signal)

BM-RS may be a reference signal used to measure beam quality for a beam (eg, transmission and reception beam) between a transmitting terminal and a receiving terminal in SL communication. In other words, BM-RS may be a reference signal used for BM operation. The measurement operation of beam quality can be performed continuously. The BM-RS may be a CSI-RS (e.g., CSI-RS in existing SL communication), a modified CSI-RS, or an extended CSI-RS. Alternatively, a new reference signal for BM-RS can be defined.

■ BSI (beam state information)

BSI may be beam information measured based on BM-RS. The BSI may include at least one of a beam index, beam measurement information (eg, beam quality information), or an operation result for a beam measurement value. The beam index may be an index for the beam with the best quality or an index (s) for the beam(s) with a beam quality above a threshold. Beam measurement information may be reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), etc.

■ SR-BM (scheduling request for beam management)

SR-BM may be used to request resources for BM operations (e.g., transmission of BSI requests, transmission of BM-RSs, and/or reception of BSI reports). The UE may request resources for BM operations (e.g., transmission of a BSI request, transmission of a BM-RS, and/or reception of a BSI report) by transmitting an SR-BM to the base station.

■ Response-SR (response for scheduling request)

The base station may transmit a response-SR to the terminal in response to the SR-BM. The response-SR may include resource information for BM operations (e.g., transmission of a BSI request, transmission of a BM-RS, and/or reception of a BSI report). Response-SR may be a signaling message.

In resource allocation (RA) mode 1, the base station allocates resources for BM operations (e.g., transmission of a BSI request, transmission of a BM-RS, and/or reception of a BSI report) to a terminal (e.g., a transmitting terminal and/or Or it can be assigned to the receiving terminal). The transmitting terminal may receive resource information (eg, resource allocation information) for BM operation from the base station. Afterwards, in order to obtain beam information (e.g., beam measurement information, beam quality information, beam state information), the transmitting terminal may transmit a BSI request and/or BM-RS using resources allocated by the base station. there is. In the present disclosure, beam information may mean beam measurement information, beam quality information, and/or beam state information. The receiving terminal can receive the BM-RS from the transmitting terminal, generate beam information by performing a measurement operation on the BM-RS, and transmit the beam information to the transmitting terminal.

In other words, the receiving terminal can transmit the BSI to the transmitting terminal, and the transmitting terminal can receive the BSI from the receiving terminal. Based on the operation (eg, BM operation), the transmitting terminal may determine and/or change the transmission beam, and the receiving terminal may determine and/or change the reception beam. In other words, a beam pair between the transmission beam of the transmitting terminal and the reception beam of the receiving terminal can be set. In this disclosure, signaling schemes for BM operation will be proposed, and modification and/or expansion of the proposed signaling schemes may be possible. Additionally, combinations between the proposed signaling schemes and other signaling schemes may be possible.

In RA mode 2, without signaling operation for resource allocation for BM operation between the base station and the transmitting terminal, the transmitting terminal performs resource sensing/selection operation to perform BM operation (e.g., transmission of BSI request, transmission of BM-RS, and/or receiving a BSI report) may be selected, and a BM operation may be performed using the selected resource(s). In the present disclosure, a resource sensing/selection operation may mean a resource sensing operation and/or a resource selection operation. The BM operation using resource(s) allocated by the base station in RA mode 1 and the BM operation using resource(s) selected by the transmitting terminal in RA mode 2 may be performed based on the same or similar method. In this disclosure, the BM operation will be described based on RA mode 1, but the BM operation described in this disclosure can be applied not only to a communication system supporting RA mode 1 but also to a communication system supporting RA mode 2. For example, BM operation according to RA mode 1 can be applied as is in a communication system supporting RA mode 2. Alternatively, modification and/or expansion of BM operation according to RA mode 1 may be applied in a communication system supporting RA mode 2.

Figure 9 is a flowchart showing a first embodiment of BM operation.

Referring to FIG. 9, the transmitting terminal (eg, first UE) may transmit an SR-BM to the base station to request resource allocation for BM operation (S901). The transmitting terminal can transmit SR-BM when BM operation is required. Cases where BM operation is required include “when the transmission beam of the transmitting terminal needs to be changed,” “when the receiving beam of the receiving terminal needs to be changed,” “when the beam pair between the transmitting terminal and the receiving terminal needs to be changed,” and/ Or, it may be “a case where a beam failure occurs between the transmitting terminal and the receiving terminal.” The base station can receive the SR-BM from the transmitting terminal and allocate resources for the BM operation of the transmitting terminal. The base station may transmit a response-SR containing resource allocation information for BM operation to the transmitting terminal (S902). The transmitting terminal can receive the response-SR from the base station and check the resource allocation information for BM operation included in the response-SR.

SR-BM and response-SR can each be signaled on the Uu interface between the base station and the transmitting terminal. For example, each of the SR-BM and response-SR may be transmitted through at least one of upper layer signaling, MAC signaling, or PHY signaling. PHY signaling messages may be transmitted on PUCCH and/or PUSCH.

The SR-BM may include information (e.g., location information) of time and/or frequency resources required by the transmitting terminal for transmission of a BSI request, transmission of a BM-RS, and/or reception of a BSI report. there is. In other words, SR-BM may include resource request information. The time resource information may include at least one of symbol number information, a start symbol index, an end symbol index, indices of one or more symbols, number of slots information, a start slot index, an end slot index, or an index of one or more slots. You can. Frequency resource information includes information on the number of subchannels, a start subchannel index, an end subchannel index, indices of one or more subchannels, information on the number of RBs (resource blocks), a start RB index, an end RB index, and an index of one or more RBs. It may include at least one of s, or interlace index(s).

Table 4 below may indicate resource request information indicated by SR-BM.

SR-BM may include indication bits. The transmitting terminal may transmit an SR-BM set to 00 to the base station to request allocation of T1 slot(s) and F1 subchannel(s) to the base station. T1 slot(s) may be consecutive T1 slots. Alternatively, the T1 slot(s) may have regular time intervals. The F1 subchannel(s) may be F1 consecutive subchannels. Alternatively, the F1 subchannel(s) may have constant frequency spacing.

The transmitting terminal may transmit an SR-BM set to 11 to the base station to request the base station for allocation of quasi-static slot(s) (e.g., quasi-static SL slot(s)) and F4 subchannel(s). there is. In other words, in order to repeatedly use one or more consecutive slots at regular time intervals, the transmitting terminal may transmit an SR-BM set to 11 to the base station. In this case, the SR-BM includes at least one of the number of one or more consecutive slots, the time interval of one or more consecutive slots, information on the start slot among one or more consecutive slots, or information on the end slot among one or more consecutive slots. It can contain one.

The following operations may be performed for indication of resource information, request for various resources, and/or indication of resources allocated according to the request. The base station can pre-set information on resources that are allowed to be used to the transmitting terminal through signaling. The transmitting terminal may transmit an SR-BM indicating a specific resource among the resources set by the base station to the base station. Based on the indication bits defined in Table 4, aperiodic BM operation and/or quasi-static BM operation may be performed. In the present disclosure, signaling may mean at least one of higher layer signaling (eg, SI signaling, RRC signaling), MAC signaling, or PHY signaling.

SR-BM can be set as a sequence instead of indication bits. For example, four different sequences may indicate requests for different resources. The transmitting terminal can request allocation of resources corresponding to one sequence by transmitting an SR-BM set to one of four different sequences to the base station. SR-BM can be used to request allocation of only time resources or only frequency resources.

After receiving the SR-BM, the base station may transmit a response-SR including time resource information and/or frequency resource information to the transmitting terminal. Time resource information may include interval information between time resources. When an SR-BM set to 11 is received, the base station can allocate one or more consecutive slots that are used repeatedly at regular time intervals to the transmitting terminal. In this case, the base station includes at least one of the number of one or more consecutive slots, the interval of one or more consecutive slots, information on the start slot among one or more consecutive slots, or information on the end slot among one or more consecutive slots. A response-SR can be transmitted to the sending terminal.

In order to indicate resources allocated by the base station, the base station can pre-set information on various types of resources that can be allocated to the transmitting terminal through signaling. The base station may transmit resource allocation information (eg, response-SR) indicating a specific resource among resources preset to the terminal to the transmitting terminal. Response-SR may be transmitted through signaling on the Uu interface between the base station and the transmitting terminal.

The transmitting terminal may receive a response-SR from the base station and check resource allocation information (eg, time resource information and/or frequency resource information) included in the response-SR. The transmitting terminal may transmit a BSI request to the receiving terminal (e.g., the second UE) in the resource(s) indicated by the response-SR (e.g., resource allocation information) (S903). The receiving terminal may receive a BSI request from the transmitting terminal and determine that BSI reporting is requested based on the BSI request. A BSI request may trigger transmission of a BSI report. The response-SR can be received not only by the transmitting terminal that transmitted the SR-BM but also by the receiving terminal. When the response-SR is received from the base station, the receiving terminal may perform a monitoring operation for reception of the BSI request on the resource(s) indicated by the response-SR.

After transmission of the BSI request, the transmitting terminal may transmit a BM-RS to the receiving terminal on the resource(s) indicated by the response-SR (eg, resource allocation information) (S904). Transmission resources of the BM-RS may be indicated by “resource allocation information included in the BSI request” or “resource allocation information included in the SCI including the BSI request.” The BM-RS transmission resource indicated by the resource allocation information included in the BSI request or SCI may belong to the resources allocated by the base station in S902.

The receiving terminal can receive the BM-RS from the transmitting terminal and generate BSI (eg, beam quality information, beam measurement information) by performing a measurement operation on the BM-RS. The response-SR can be received not only by the transmitting terminal that transmitted the SR-BM but also by the receiving terminal. When the response-SR is received from the base station, the receiving terminal may perform a monitoring operation for reception of the BM-RS on the resource(s) indicated by the response-SR. The receiving terminal may transmit a BSI report to the transmitting terminal (S905). The transmitting terminal may receive a BSI report from the receiving terminal, and may perform BM operations (eg, beam determination, beam change, beam setting, etc.) based on the BSI report. The receiving terminal may perform BM operations (eg, beam determination, beam change, beam setting, etc.) based on the BSI. According to the above operations, a beam pair between the transmission beam of the transmitting terminal and the reception beam of the receiving terminal can be established.

In S903 and/or S904, the transmitting terminal may explicitly or implicitly instruct the receiving terminal to perform an operation to change (or determine) the reception beam of the receiving terminal based on the BM operation. In this case, the receiving terminal may perform a receiving beam change (or decision) operation without transmitting a BSI report after receiving the BM-RS. The transmitting terminal may not expect to receive a BSI report from the receiving terminal. Alternatively, the receiving terminal may perform a receiving beam change (or decision) operation after transmitting the BSI report.

BSI requests, BM-RSs, and/or BSI reports can be generated from a resource pool (RP) (SL-RP) allocated for SL communications (e.g., SL data communications) or a dedicated RP for BM operations (e.g., BM-RP) can be transmitted and received within at least one RP. When both SL-RP and BM-RP are used (e.g., operated), the RP setting information may include information indicating that the RP set by the RP setting information is SL-RP or BM-RP. there is. The base station may generate RP configuration information and transmit the RP configuration information to a terminal (eg, a transmitting terminal and/or a receiving terminal) through signaling. Alternatively, the transmitting terminal may generate RP configuration information and transmit the RP configuration information to the receiving terminal through signaling. The transmitting terminal and/or the receiving terminal may receive RP configuration information. The transmitting terminal may perform a BSI request transmission operation, a BM-RS transmission operation, and/or a BSI report reception operation within the RP indicated by the RP configuration information. The receiving terminal may perform a BSI request reception operation, a BM-RS reception operation, and/or a BSI report transmission operation within the RP indicated by the RP configuration information.

The same frequency resources (e.g., the same frequency band) may be allocated (e.g., set) for BM-RP and SL-RP, and different time resources may be allocated (e.g., set) for BM-RP and SL-RP. For example, it can be set).

Alternatively, the frequency band of BM-RP may include part or all of the frequency band of SL-RP. The frequency band of the BM-RP may include “the frequency band of the SL-RP” and “the frequency band adjacent to the frequency band of the SL-RP.” The time resources of BM-RP and the time resources of SL-RP can be set to not overlap. Alternatively, the frequency band of SL-RP may include part or all of the frequency band of BM-RP.

The frequency resources of the BM-RP can be set so that the beam information measured in the BM-RP is effectively used in the SL-RP. The base station signals a plurality of resource areas for the SL-RP and/or a plurality of resource areas for the BM-RP to a terminal (e.g., a transmitting terminal and/or a receiving terminal) through signaling (e.g., higher layer signaling). ) can be set in advance, and a specific resource area among a plurality of resource areas can be allocated to the terminal as the resource area of the SL-RP and/or BM-RP. SL-RP and BM-RP may be paired (e.g., mapped), and a pair of SL-RP and BM-RP may be set in the terminal. In other words, the base station can transmit mapping information between SL-RP and BM-RP to the terminal through signaling (e.g., higher layer signaling). The SL-RP paired (e.g., mapped) with the BM-RP may be an SL-RP for which beam information measured in the BM-RP is effectively used. The terminal can perform a BM operation in the BM-RP, and perform SL communication using a beam (e.g., determined beam, set beam) changed by the BM operation in the SL-RP paired with the BM-RP. can do.

The three BM signals (e.g., BSI Request, BM-RS, BSI Report) may be transmitted from the same RP or different RPs. In this case, BM signals can be transmitted according to the cases below.

- Case 1: Three BM signals (e.g., BSI request, BM-RS, BSI report) are transmitted within SL-RP

- Case 2: Two BM signals (e.g., BSI request, BSI report) are transmitted within the SL-RP, and one BM signal (e.g., BM-RS) is transmitted within the BM-RP.

- Case 3: Three BM signals (e.g., BSI request, BM-RS, BSI report) are transmitted within BM-RP

In case 1, BM operation can be performed without operation of additional RP other than SL-RP. Resource utilization for transmission of BSI requests, BM-RS, and BSI reports within SL-RP may increase. Accordingly, traffic congestion may occur. In this case, resources for transmission of SL data within the SL-RP may be insufficient, and transmission collisions between terminals may occur in a slot (eg, SL slot).

In case 3, the BM operation is performed in an additional RP (eg, BM-RP), so the problem in case 1 can be solved. However, the receiving terminal must perform additional monitoring operations (e.g., decoding operation, blind decoding operation) in the BM-RP in addition to the SL-RP to detect the BSI request. Accordingly, the load and/or energy consumption of the receiving terminal may increase.

Since in case 2 only BM-RS is transmitted through BM-RP, the problem of case 1 (e.g., traffic congestion within SL-RP) can be alleviated. In case 2, the BSI request is transmitted through the SL-RP, so the receiving terminal performs monitoring operations (e.g., decoding operation, blind decoding operation) only in the SL-RP to detect the BSI request, so in case 3 The problem can be alleviated. If only BM-RS is transmitted in BM-RP, resource allocation within SL-RP can be performed more flexibly. In other words, resource allocation within SL-RP may be performed in time units smaller than slots (e.g., symbol units).

[Case 1]

In Case 1, three BM signals can be transmitted and received within SL-RP. The response-SR may include resource information for transmission of a BSI request, transmission of a BM-RS, and/or reception of a BSI report within the SL-RP.

Additionally, the response-SR may include resource information for transmission of the BSI report within the SL-RP. If the response-SR includes resource information for transmission of the BSI report, the transmitting terminal may transmit a BSI request including resource information for transmission of the BSI report to the receiving terminal. The receiving terminal can receive a BSI request from the transmitting terminal, check resource information included in the BSI request, and transmit a BSI report on the resource indicated by the resource information. When a BSI request is included in the SCI, resource information for transmission of the BSI report may be included in the SCI.

The transmitting terminal may transmit an SCI including a BSI request in a specific slot and transmit a BM-RS in a slot scheduled by the SCI (e.g., scheduled PSSCH, reserved slot, reserved PSSCH). SCI including a BSI request may be transmitted in standalone or two-step SCI form. The SCI may include information indicating that the reserved resource (eg, scheduled resource, allocated resource) is a resource for BM-RS transmission. For example, a 1-bit indicator included in SCI may indicate that the reserved slot is a resource for BM-RS transmission.

A new SCI and/or a new SCI field to indicate transmission resources of the BM-RS may be defined. The new SCI may include information indicating that the reserved resource is a resource for BM-RS transmission. The new SCI field in SCI may include information indicating that the reserved resource is a resource for BM-RS transmission. A new SCI for BM operation can be defined in SCI format 2-D. If the value of the second stage SCI format field included in SCI format 1-A is set to 11, this may indicate that SCI format 2-D is used. Resources reserved by SCI format 2-D may be resources for BM-RS transmission. In other words, it may be indicated that the resource reserved by SCI format 2-D is BM-RS transmission. Alternatively, a new first level SCI format for BM operation (eg, SCI Format 1-B) may be defined. In this case, resources reserved by SCI format 1-B may be resources for BM-RS transmission. In other words, it can be indicated that the resources reserved by SCI format 1-B are resources for BM-RS transmission.

The BSI request may include BM-RS transmission method information. Transmission method information is “the transmitting terminal transmits the BM-RS using the same transmission beam,” “the transmitting terminal transmits the BM-RS using different transmission beams,” or “the transmitting terminal transmits the BM-RS using beam sweeping.” “Transmitting BM-RS using different transmission beams based on a (beam sweeping) method” may be indicated. In other words, the transmission method information may be pattern information of the transmission beam of the transmitting terminal. When a two-step SCI procedure is used, some of the above-described information elements may be transmitted through the first step SCI, and remaining information elements of the above-described information elements may be transmitted through the second step SCI. . For example, the first stage SCI may include information indicating that the reserved resource is a resource for BM-RS transmission, and the second stage SCI associated with the first stage SCI may be reserved for BM-RS transmission. It may include resource information and/or BM-RS transmission method information (eg, transmission beam pattern information).

In Case 1, the transmitting terminal may transmit an SCI including a BSI request and transmit a BM-RS in the PSSCH area within the slot in which the SCI is transmitted. In this case, SCI may be transmitted in standalone form or two-step SCI form. SCI may include information indicating that the slot in which the SCI is transmitted is a resource for BM-RS transmission. For example, a 1-bit indicator included in the SCI may indicate that the slot in which the SCI is transmitted is a resource for BM-RS transmission.

The new SCI format and/or new SCI field (e.g., reserved resource field of BM-RS) for BM-RS transmission is the current slot (e.g., the slot in which the new SCI format and/or new SCI field is transmitted) This may indicate that this is a resource for BM-RS transmission. A new SCI for BM operation can be defined in SCI format 2-D. If the value of the second stage SCI format field included in SCI format 1-A is set to 11, this may indicate that SCI format 2-D is used. Resources reserved by SCI format 2-D may be resources for BM-RS transmission. In other words, it can be indicated that the resources reserved by SCI format 2-D are resources for BM-RS transmission. Alternatively, a new first level SCI format for BM operation (eg, SCI Format 1-B) may be defined. In this case, resources reserved by SCI format 1-B may be resources for BM-RS transmission. In other words, it can be indicated that the resources reserved by SCI format 1-B are resources for BM-RS transmission.

The BSI request may include BM-RS transmission method information. Transmission method information is “the transmitting terminal transmits the BM-RS using the same transmission beam,” “the transmitting terminal transmits the BM-RS using different transmission beams,” or “the transmitting terminal transmits the BM-RS using beam sweeping.” “Transmitting the BM-RS using different transmission beams based on the method” may be indicated. In other words, the transmission method information may be pattern information of the transmission beam of the transmitting terminal. When a two-step SCI procedure is used, some of the above-described information elements may be transmitted through the first step SCI, and remaining information elements of the above-described information elements may be transmitted through the second step SCI. . For example, the first stage SCI indicates that the current slot (e.g., the slot in which the first stage SCI is transmitted or the slot in which the second SCI associated with the first stage SCI is transmitted) is a resource for BM-RS transmission. It may include information and/or BM-RS transmission method information (e.g., transmission beam pattern information), and the second stage SCI associated with the first stage SCI is reserved resource information for BM-RS transmission. may include.

In the embodiments for Case 1 described above, SCI may include a sequence type, multiplexing method, and/or resource mapping method of BM-RS. In other words, SCI may include some or all of the information elements required by the terminal for BM-RS reception. When a two-step SCI procedure is used, some of the above-described information elements may be transmitted through the first step SCI, and remaining information elements of the above-described information elements may be transmitted through the second step SCI. .

[Case 2]

In case 2, the BSI request and BSI report may be transmitted within the SL-RP, and the BM-RS may be transmitted within the BM-RP. To support the above operation, the response-SR may include resource information for transmission of the BSI request and BSI report in the SL-RP and resource information for transmission of the BM-RS in the BM-RP. If the response-SR includes resource information for transmission of the BSI report, the transmitting terminal may transmit a BSI request including resource information for transmission of the BSI report to the receiving terminal. The receiving terminal can receive a BSI request from the transmitting terminal, check resource information included in the BSI request, and transmit a BSI report on the resource indicated by the resource information. When a BSI request is included in the SCI, resource information for transmission of the BSI report may be included in the SCI.

The transmitting terminal may transmit an SCI including a BSI request in a slot within the SL-RP, and in a slot scheduled by the SCI within the BM-RP (e.g., scheduled PSSCH, reserved slot, reserved PSSCH). BM-RS can be transmitted. SCI including a BSI request can be transmitted in standalone form or two-step SCI form. The SCI may include information indicating that the reserved resource (eg, scheduled resource, allocated resource) is a resource for BM-RS transmission. For example, a 1-bit indicator included in SCI may indicate that the reserved slot is a resource for BM-RS transmission within the BM-RP.

A new SCI and/or a new SCI field to indicate transmission resources of the BM-RS may be defined. The new SCI may include information indicating that the reserved resource is a resource for BM-RS transmission. The new SCI field in SCI may include information indicating that the reserved resource is a resource for BM-RS transmission. A new SCI for BM operation can be defined in SCI format 2-D. If the value of the second stage SCI format field included in SCI format 1-A is set to 11, this may indicate that SCI format 2-D is used. Resources reserved by SCI format 2-D may be resources for BM-RS transmission. In other words, it may be indicated that resources reserved by SCI format 2-D are resources for BM-RS transmission. Alternatively, a new first level SCI format for BM operation (eg, SCI Format 1-B) may be defined. In this case, resources reserved by SCI format 1-B may be resources for BM-RS transmission. In other words, it can be indicated that the resources reserved by SCI format 1-B are resources for BM-RS transmission.

The BSI request may include BM-RS transmission method information. Transmission method information is “the transmitting terminal transmits the BM-RS using the same transmission beam,” “the transmitting terminal transmits the BM-RS using different transmission beams,” or “the transmitting terminal transmits the BM-RS using beam sweeping.” “Transmitting the BM-RS using different transmission beams based on the method” may be indicated. In other words, the transmission method information may be pattern information of the transmission beam of the transmitting terminal. SCI may include sequence type, multiplexing method, and/or resource mapping method of BM-RS. In other words, SCI may include some or all of the information elements required by the terminal for BM-RS reception. When a two-step SCI procedure is used, some of the above-described information elements may be transmitted through the first step SCI, and remaining information elements of the above-described information elements may be transmitted through the second step SCI. . For example, the first stage SCI may include information indicating that the reserved resource is a resource for BM-RS transmission, and the second stage SCI associated with the first stage SCI may be reserved for BM-RS transmission. It may include resource information and/or BM-RS transmission method information (for example, transmission beam pattern information).

In Case 2, the BM-RP may be a dedicated resource (e.g., a dedicated RP) for BM-RS transmission. The resource allocation unit in BM-RP may be set and/or operated differently from the resource allocation unit (e.g., one slot unit) in SL-RP. For example, time resources allocated for BM-RS transmission may be a plurality of slots. The plurality of slots may be contiguous slots or non-consecutive slots. All symbols in each of the slots can be used for BM-RS transmission. Alternatively, only some symbols in each of the slots may be used (eg, allocated) for BM-RS transmission. Alternatively, symbols having a specific time interval within one slot may be allocated to be used for BM-RS transmission (eg, periodic BM-RS transmission). A method of allocating a transmission symbol of a BM-RS based on one slot, a modification of the allocation method, an extension of the allocation method, and/or a combination of the allocation method and another method may be used in a plurality of slots (e.g., It can be applied for allocation of transmission symbols of BM-RS in consecutive slots or non-consecutive slots).

The symbol used for initial BM-RS transmission may be an automatic gain control (AGC) symbol. In the AGC symbol, any signal known to the transmitting terminal and the receiving terminal can be transmitted. A specific BM-RS may be transmitted based on configuration information between the transmitting terminal and the receiving terminal. The specific BM-RS may be transmitted in an AGC symbol. The base station can transmit resource allocation information for BM-RS transmission to the transmitting terminal through signaling. The transmitting terminal can receive resource allocation information for BM-RS transmission from the base station. Resource allocation information may include information on a plurality of candidate resources for BM-RS transmission. The transmitting terminal may transmit an SCI containing information indicating a specific candidate resource among a plurality of candidate resources set by the base station to the receiving terminal. The receiving terminal can receive the SCI from the transmitting terminal and check resources for BM-RS transmission indicated by the SCI. The transmitting terminal can transmit the BM-RS on the resource indicated by the SCI, and the receiving terminal can receive (e.g., detect, measure) the BM-RS on the resource indicated by the SCI. Based on the above operations, resources for BM-RS transmission can be set aperiodically or quasi-statically.

Figure 10 is a conceptual diagram showing a first embodiment of a BM-RS transmission method.

Referring to FIG. 10, the transmitting terminal can transmit a BM-RS within the BM-RP. Two slots within BM-RP can be allocated for transmission of BM-RS. In other words, symbols (eg, 27 symbols) included in two slots within the BM-RP may be candidate resources for transmission of BM-RS. Each of the slots may contain 14 symbols, and the first symbol of slot #1 may be an AGC symbol. The ACG symbol can be used for ACG operations. AGC symbols may not be used for BM-RS transmission. In this case, candidate resources for BM-RS transmission within two slots may be 27 symbols. Depending on resource allocation for BM-RS transmission, the transmitting terminal may transmit BM-RS in all symbols (e.g., 27 symbols), some symbols, consecutive symbols, or discontinuous symbols within two slots. RS can be transmitted. The transmitting terminal may transmit BM-RS periodically or aperiodically.

The symbol through which BM-RS is transmitted may be referred to as a BM-RS symbol. The transmitting terminal may transmit the BM-RS using the same transmission beam or different transmission beams in the BM-RS symbol(s). BM-RS may be transmitted based on a beam sweeping method. In this case, a beam sweeping pattern for BM-RS transmission can be set, and the transmitting terminal can transmit the BM-RS based on the beam sweeping pattern. The base station may set various types of BM-RS resource allocation information and various types of beam sweeping patterns to the terminal (eg, the transmitting terminal and/or the receiving terminal) through signaling. The transmitting terminal may transmit a BSI request containing information indicating a specific setting among the settings of the base station to the receiving terminal. BM operation between the transmitting terminal and the receiving terminal may be performed based on settings indicated by the transmitting terminal.

[Case 3]

In case 3, all BM signals (e.g., BSI request, BM-RS, BSI report) can be transmitted and received within the BM-RP. To support the above operation, the response-SR may include resource information for transmission of the BSI request and BM-RS in the BM-RP. Additionally, the response-SR may further include resource information for transmission of the BSI report. If the response-SR includes resource information for transmission of the BSI report, the transmitting terminal may transmit a BSI request including resource information for transmission of the BSI report to the receiving terminal. The receiving terminal can receive a BSI request from the transmitting terminal, check resource information included in the BSI request, and transmit a BSI report on the resource indicated by the resource information. When a BSI request is included in the SCI, resource information for transmission of the BSI report may be included in the SCI.

In case 3, both the BSI request and the BM-RS can be transmitted in the BM-RP. Therefore, the transmission operation of the BSI request and BM-RS within the SL-RS defined in Case 1, modification of the transmission operation, extension of the transmission operation, and/or a combination of the transmission operation and other operations can be applied to Case 3. there is. However, since only BM operations are performed within the BM-RP, the BSI request does not need to indicate that the reserved resource is a resource for BM-RS transmission within the BM-RP. “when a BSI request and a BM-RS are transmitted sequentially in the time domain” and/or “a BSI request containing resource allocation information (e.g., resource reservation information) is transmitted, and then When a BM-RS is transmitted from a resource", unlike case 1, the BSI request contains "information indicating whether the resource indicated by the BSI request is a resource within the BM-RP" and/or "information indicating whether the resource indicated by the BSI request is a resource within the BM-RP." It may not include “information indicating whether the indicated resource is a reserved resource for BM-RS.”

In the resource allocation procedure for BM operation, when both SL-RP and BM-RP are operated as in case 2, SR-BM may include request information for resource allocation in each of SL-RP and BM-RP. Table 4 for BM-RP and Table 4 for SL-RP can be set and/or operated independently. Alternatively, resource allocation may be requested in each of the SL-RP and BM-RP based on one Table 4 (e.g., a common table). When a common table is used, a 1-bit indicator can be additionally used to distinguish between the SL-RP's resource allocation request and the BM-RP's resource allocation request within the SR-BM. Alternatively, the field in the SR-BM may be composed of a subfield for the SL-RP's resource allocation request and a subfield for the BM-RP's resource allocation request.

BM-RS transmission may be transmitted in SL-RP or BM-RP. In other words, the transmitting terminal can select an RP for BM-RS transmission and perform BM-RS transmission in the selected RP (eg, SL-RP or BM-RP). In this case, a combination of Case 1 and Case 2 can be used. To support the above operation, the BSI request may include information indicating the RP through which the BM-RS is transmitted.

In Case 1, Case 2, and/or Case 3, the receiving terminal may receive (e.g., detect) the BSI request by performing a monitoring operation (e.g., a decoding operation, a blind decoding operation), and the BSI request The BM-RS can be received from the transmitting terminal on the resource indicated by, the BSI can be generated through measurement of the BM-RS, and the BSI report can be transmitted to the transmitting terminal. Information (eg, additional information) necessary to support the operations of the receiving terminal may be transmitted to the receiving terminal. The above required information may be included in the BSI request.

Combinations of Case 1, Case 2, and Case 3, extensions of the combinations, and/or variations of the combinations may be used. To operate the above combination, SR-BM may include instruction information to distinguish each case.

Figure 11 is a flowchart showing a second embodiment of BM operation.

Referring to FIG. 11, when a BM operation is required, the receiving terminal (eg, the second UE) may transmit a BM request to the transmitting terminal (eg, the first UE) (S1101). Cases where BM operation is required include “when the transmission beam of the transmitting terminal needs to be changed,” “when the receiving beam of the receiving terminal needs to be changed,” “when the beam pair between the transmitting terminal and the receiving terminal needs to be changed,” and/ Or, it may be “a case where a beam failure occurs between the transmitting terminal and the receiving terminal.” The BM request may include information about why the BM operation is needed. 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 can perform a BM operation. In other words, the transmitting terminal may transmit the SR-BM to the base station after receiving the BM request (S1102). Alternatively, the transmitting terminal may determine whether to perform the BM operation based on the BM request (eg, information included in the BM request). If it is determined that the BM operation is to be performed, the transmitting terminal may transmit the SR-BM to the base station. If it is determined that the BM operation is not performed, the transmitting terminal may not transmit the SR-BM to the base station. Performance of BM operations may be triggered by a BM request.

The second embodiment shown in FIG. 11 may further include S1101 compared to the first embodiment shown in FIG. 9. Steps after S1101 in FIG. 11 may be performed identically or similarly to the steps in FIG. 9 . For example, each of S1102, S1103, S1104, S1105, and S1106 in FIG. 11 may be performed identically or similarly to each of S901, S902, S903, S904, and S905 in FIG. 9.

A beam pair problem (eg, beam failure problem) between the transmitting terminal and the receiving terminal may be first recognized (or detected) in the receiving terminal. In the first embodiment of FIG. 9, the receiving terminal may detect a beam pair problem and transmit a CSI report to the transmitting terminal to inform the transmitting terminal of the need for BM operation for beam pair change. In the first embodiment of FIG. 9, it may be necessary to perform a CSI-RS-based CSI reporting procedure. The transmitting terminal may receive a CSI report from the receiving terminal and determine whether to perform a BM operation based on the CSI report. CSI reporting can be used for triggering BM operations. The triggering operation of CSI reporting may be performed by the transmitting terminal. “If periodic CSI reporting is triggered and the CSI reporting period is long,” the receiving terminal may not immediately transmit the CSI report even if it recognizes a beam pair problem between the transmitting terminal and the receiving terminal. In this case, the transmitting terminal may confirm the beam pair problem late.

In the first implementation of FIG. 9, “when the operation of periodic CSI reporting is not supported”, “when the operation of periodic BSI reporting is not supported”, and/or “when the cycle of CSI reporting/BSI reporting is long” , the transmitting terminal may not be able to trigger the BM operation at the point when the BM operation needs to be performed due to a beam pair problem.

To solve the above problem, in the second embodiment of FIG. 11, the receiving terminal may transmit a BM request to the transmitting terminal when it is necessary to perform a BM operation. The BM request may be transmitted to the transmitting terminal through signaling. The transmitting terminal may trigger a BM operation based on the BM request. In other words, the transmitting terminal may initiate BM operation based on the BM request without CSI reporting and/or BSI reporting.

Embodiments according to Table 4, Figures 9, and Figure 10, variations of the above embodiments, extensions of the above embodiments, and/or combinations of the above embodiments and other embodiments can be applied to the embodiment of Fig. 11. In the embodiment according to Table 4, FIGS. 9, 10, and 11, without a procedure for transmitting and receiving a BM signal (e.g., SR-BM and/or response-SR) between the transmitting terminal and the base station, the base station sends a BSI request, Resources (e.g., periodic resources, semi-static resources, aperiodic resources) for transmission of BM-RS and/or BSI reports may be set (e.g., allocated) to the transmitting terminal. The operation of configuring resources for transmission of a BSI request, BM-RS, and/or BSI report in the transmitting terminal may be performed on the Uu interface between the base station and the transmitting terminal. Resource information for transmission of a BSI request, BM-RS, and/or BSI report may be transmitted to the transmitting terminal through signaling. The transmitting terminal can check the resources (e.g., allocated resources) set in the base station, and use the confirmed resources to perform a transmission operation of a BSI request, a transmission operation of a BM-RS, and/or a reception operation of a BSI report. can do.

In RA mode 2, without a procedure for transmitting and receiving a BM signal (e.g., SR-BM and/or response-SR) between the transmitting terminal and the base station according to the embodiment according to Table 4, Figures 9, 10, and 11, The transmitting terminal may select a resource by performing a resource sensing/selection operation, and may perform a BSI request transmission operation, a BM-RS transmission operation, and/or a BSI report reception operation on the selected resource. The transmitting terminal may receive a BSI report from the receiving terminal and determine (eg, change, set) a beam based on the BSI report. In other words, when the first embodiment of FIG. 9 is applied to RA mode 2, S901 and S902 may not be performed, and S903, S904, and S905 may be performed. When the second embodiment of FIG. 11 is applied to RA mode 2, S1102 and S1103 may not be performed, and S1101, S1104, S1105, and S1106 may be performed.

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 (20)

As a method of a first UE (user equipment), Transmitting a scheduling request (SR)-BM requesting resource allocation for a beam management (BM) operation to the base station; Receiving a response-SR including resource allocation information in response to the SR-BM from the base station; and Comprising the step of performing the BM operation with a second UE based on resources indicated by the resource allocation information, Method of first UE. In claim 1, The step of performing the BM operation is, Transmitting a beam state information (BSI) request to the second UE based on the resources indicated by the resource allocation information; Transmitting a BM-RS (reference signal) to the second UE based on the resources indicated by the resource allocation information; Receiving a BSI report including beam measurement information based on the BM-RS from the second UE; and Comprising managing the transmission beam of the first UE based on the beam measurement information included in the BSI report, The BSI request triggers transmission of the BSI report, Method of first UE. In claim 2, The BSI request is included in sidelink control information (SCI) transmitted from the first UE to the second UE, and the BM-RS is transmitted on a physical sidelink shared channel (PSSCH) scheduled by the SCI, Method of first UE. In claim 2, The BM-RP (resource pool) for the BM operation is set independently of the SL-RP for sidelink (SL) communication between the first UE and the second UE, and the BSI request, the BM-RS, or the At least one of the BSI reports is transmitted and received within the BM-RP, Method of first UE. In claim 4, The pair of the BM-RP and the SL-RP is set in the first UE, and at least one of the transmission beam of the first UE or the reception beam of the second UE determined by the BM operation within the BM-RP Is used for the SL communication between the first UE and the second UE within the SL-RP paired with the BM-RP, Method of first UE. In claim 4, The resource allocation information of the response-SR includes resource information for the SL-RP and resource information for the BM-RP, Method of first UE. In claim 2, The BSI request includes transmission method information of the BM-RS, and the transmission method is “the first UE transmits the BM-RS using the same transmission beam” or “the first UE transmits the BM-RS using beam sweeping” Instructing “to transmit the BM-RS based on the method,” Method of first UE. In claim 2, The BSI request includes resource information for transmission of the BSI report, and the BSI report is received from resources indicated by the resource information included in the BSI request. Method of first UE. In claim 1, The method of the first UE is: Further comprising receiving a BM request from the second UE indicating that the BM operation is required, The transmission operation of the SR-BM is triggered based on the BM request, Method of first UE. In claim 1, The SR-BM is transmitted when the BM operation is necessary, and when the BM operation is necessary, “when the transmission beam of the first UE needs to be changed” and “when the reception beam of the second UE needs to be changed” ", "when a change in the beam pair between the first UE and the second UE is necessary", or "when a beam failure occurs between the first UE and the second UE", Method of the first UE. As a method of a second UE (user equipment), Receiving sidelink control information (SCI) including a beam state information (BSI) request from a first UE; Receiving a beam management-reference signal (BM-RS) from the first UE on a physical sidelink shared channel (PSSCH) scheduled by the SCI; generating beam state information by performing a beam measurement operation based on the BM-RS; Transmitting a BSI report including the beam state information to the first UE; and Comprising managing a reception beam of the second UE based on the beam state information, Method of the second UE. In claim 11, The BSI request triggers transmission of the BSI report, the BSI request includes resource information for transmission of the BSI report, and the BSI report is generated from resources indicated by the resource information included in the BSI request. transmitted, Method of the second UE. In claim 11, BM-RP (resource pool) for BM operation is set independently from the SL-RP for sidelink (SL) communication between the first UE and the second UE, and the BSI request, the BM-RS, or the BSI At least one of the reports is transmitted and received within the BM-RP, Method of the second UE. In claim 13, The pair of the BM-RP and the SL-RP is set in the second UE, and at least one of the transmission beam of the first UE or the reception beam of the second UE determined by the BM operation within the BM-RP Is used for the SL communication between the first UE and the second UE within the SL-RP paired with the BM-RP, Method of the second UE. In claim 11, The BSI request includes transmission method information of the BM-RS, and the transmission method is “the first UE transmits the BM-RS using the same transmission beam” or “the first UE transmits the BM-RS using beam sweeping” Instructing “to transmit the BM-RS based on the method,” Method of the second UE. In claim 11, The method of the second UE is, Further comprising transmitting a BM request to the first UE indicating that BM operation is required, The BM operation is triggered based on the BM request, Method of the second UE. In claim 11, The BM request is transmitted when the BM operation is necessary, and when the BM operation is necessary, “when the transmission beam of the first UE needs to be changed” and “when the reception beam of the second UE needs to be changed” , “when a change in the beam pair between the first UE and the second UE is necessary”, or “when a beam failure occurs between the first UE and the second UE”, in the case of at least one of the following, 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: Transmitting a scheduling request (SR)-BM requesting resource allocation for a beam management (BM) operation to the base station; Receive a response-SR including resource allocation information in response to the SR-BM from the base station; and causing the BM to perform an operation with a second UE based on resources indicated by the resource allocation information, 1st U.E. In claim 18, When performing the BM operation, the at least one processor allows the first UE to: transmitting a beam state information (BSI) request to the second UE based on the resources indicated by the resource allocation information; transmitting a BM-RS (reference signal) to the second UE based on the resources indicated by the resource allocation information; Receive a BSI report including beam measurement information based on the BM-RS from the second UE; and Causes to manage the transmission beam of the first UE based on the beam measurement information included in the BSI report, The BSI request triggers transmission of the BSI report, 1st U.E. In claim 18, The at least one processor is configured to allow the first UE to: further cause to receive a BM request from the second UE indicating that the BM operation is required, The transmission operation of the SR-BM is triggered based on the BM request, 1st U.E.

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