WO2024090955A1 - Method and device for beam management based on resource sensing in sidelink communication - Google Patents

Abstract

Disclosed are a method and device for beam management based on resource sensing in sidelink communication. A method of a first UE comprises the steps of: determining a resource by performing an RSS operation; comparing priorities between a first signal to be transmitted by the first UE in the resource and a second signal to be transmitted by a second UE in the resource; determining whether to perform a preemption operation for the resource on the basis of a comparison result of the priorities; and performing SL communication depending on whether the preemption operation is performed.

Description

Method and apparatus for beam management based on resource sensing in sidelink communication

This disclosure relates to sidelink communication technology, and more specifically to beam management technology based on resource sensing.

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. The first terminal may transmit a beam management signal for bin management operation. When transmission of a beam management signal from a first terminal and transmission of sidelink (SL) data from a second terminal are required on the same resource, methods for solving the collision problem of the transmissions are needed.

The purpose of the present disclosure to solve the above problems is to provide a method and device for beam management based on resource sensing in sidelink communication.

A method of a first UE according to embodiments of the present disclosure for achieving the above purpose includes determining a resource by performing an RSS operation, a first signal to be transmitted by the first UE in the resource, and a first signal in the resource. Comparing priorities between second signals to be transmitted by the second UE, determining whether to perform a preemption operation for the resource based on the comparison result of the priorities, and performing the preemption operation. and performing SL communication based on availability.

The method of the first UE may further include receiving an enable/disable indicator of the preemption operation from a base station, wherein the enable/disable indicator indicates enable of the preemption operation. In this case, the first UE may determine whether to perform the preemption operation for the resource.

The method of the first UE includes enabling/disabling the preemption operation between SL data transmissions, enabling/disabling the preemption operation between BM signal transmissions for BM operation, and SL data transmission and BM It may further include receiving configuration information indicating enabling/disabling of the preemption operation between signal transmissions from the base station, and whether to perform the preemption operation for the resource may be determined based on the configuration information. You can.

Enabling or disabling the preemption operation can be set for each RP.

The first priority of the first signal may be included in the first SCI transmitted by the first UE, and the second priority of the second signal may be included in the second SCI transmitted by the second UE. there is.

Each of the first signal and the second signal may be a BM signal or SL data, and SCI for transmission of the BM signal may be distinguished from SCI for transmission of the SL data.

The SL data may be transmitted in the SL-RP, and the BM signal may be transmitted in the BM-RP or the SL-RP set for BM operation, and the BM-RP is set to be distinct from the SL-RP. It can be.

“If the priority of the BM signal is higher than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource may not be performed. and the BM signal can be transmitted in the resource.

“If the priority of the BM signal is higher than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource may be performed , the SL data may not be transmitted in the resource.

“If the priority of the BM signal is lower than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource may be performed , the BM signal may not be transmitted in the resource.

“If the priority of the BM signal is lower than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource may not be performed. and the SL data can be transmitted in the resource.

A first UE according to embodiments of the present disclosure for achieving the above purpose includes at least one processor, wherein the at least one processor determines a resource by allowing the first UE to perform an RSS operation, and determines the resource. Compare the priorities between the first signal to be transmitted by the first UE and the second signal to be transmitted by the second UE in the resource, and preemption operation for the resource based on the comparison result of the priorities. determines whether to perform, and causes SL communication to be performed based on whether or not the preemption operation is performed.

The at least one processor may further cause the first UE to receive an enable/disable indicator of the preemption operation from the base station, wherein the enable/disable indicator enables the preemption operation. When indicated, the first UE can determine whether to perform the preemption operation for the resource.

The at least one processor allows the first UE to enable/disable the preemption operation between SL data transmissions, enable/disable the preemption operation between BM signal transmissions for BM operation, and SL It may be further caused to receive configuration information indicating enable/disable of the preemption operation between data transmission and BM signal transmission from the base station, and whether to perform the preemption operation for the resource is based on the configuration information. It can be decided.

Enabling or disabling the preemption operation can be set for each RP.

The first priority of the first signal may be included in the first SCI transmitted by the first UE, and the second priority of the second signal may be included in the second SCI transmitted by the second UE. there is.

“If the priority of the BM signal is higher than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource may not be performed. and the BM signal can be transmitted in the resource.

“If the priority of the BM signal is higher than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource may be performed , the SL data may not be transmitted in the resource.

“If the priority of the BM signal is lower than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource may be performed , the BM signal may not be transmitted in the resource.

“If the priority of the BM signal is lower than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource may not be performed. and the SL data can be transmitted in the resource.

According to the present disclosure, the first terminal can transmit a BM signal for a BM (beam management) operation. When transmission of the BM signal of the first terminal and transmission of data of the second terminal are required in the same resource, the first terminal may perform a transmission operation or a preemption operation for the BM signal based on priority. there is. According to the above method, the problem of transmission collision in the same resource can be resolved, and sidelink (SL) communication can be performed efficiently.

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

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

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

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

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

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

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

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

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

Figure 9 is a flowchart showing a first 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.

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 reverse operation 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 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 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.

In this disclosure, it can be assumed that the resource sensing/selection operation is performed based on the basic procedure(s) below. Resource sensing/selection operation may mean a resource sensing operation and/or a resource selection operation.

- Basic procedure 1: The terminal can acquire the SCI of another terminal by performing a decoding operation (e.g., a blind decoding operation) on the PSCCH(s), and other terminals based on the information element(s) included in the SCI. Resources reserved by the terminal (eg, scheduled resources) can be checked. The terminal can continuously perform the above operation.

- Basic procedure 2: When the transmitting terminal receives resource selection triggering at a specific point in time, the transmitting terminal may set a time section including the specific point in time and a past time point based on the specific point in time as a sensing window. The transmitting terminal can set a future time interval as a selection window. The transmitting terminal may check available resource(s) (eg, candidate resource(s)) by performing a resource sensing operation in the sensing window.

- Basic procedure 3: The transmitting terminal can perform a resource sensing operation in the sensing window and connect to the resource(s) identified by the resource sensing operation (e.g., available resource(s), candidate resource(s)). Based on this, specific resource(s) can be selected among resources not occupied by other terminals within the selection window, and SL (sidelink) communication can be performed using the selected specific resource(s).

The basic procedures 1, 2, and 3 may be the basic procedures of the full sensing operation. Partial sensing operation can be performed as follows. The operations proposed in this disclosure, modifications of the operations, extensions of the operations, and/or combinations of the operations and other operations may be applied to various resource sensing/selection procedures.

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

Referring to FIG. 9, the transmitting terminal may perform a resource sensing/selection operation to sense and select transmission resources for the BM signal (S901). In the present disclosure, the BM signal may include at least one of a BSI request, BM-RS, or BSI report. For example, the transmitting terminal may determine candidate resource(s) by performing a resource sensing operation, and may select one or more resources from the candidate resource(s) by performing a resource selection operation. The preemption operation described later may be applied in a resource sensing operation, a resource selection operation, or an additional resource selection operation after the resource selection operation. For example, a preemption operation may be applied to determine candidate resource(s) in a resource sensing operation. Alternatively, the preemption operation may be applied to select resource(s) in a resource selection operation. Alternatively, the preemption operation may be applied to select resource(s) in an additional resource selection operation.

The transmitting terminal may transmit a BSI request to the receiving terminal using the resource(s) selected in S901 (S902). The receiving terminal may receive a BSI request from the transmitting terminal. When a BSI request is received, the receiving terminal may determine that transmission of a BSI report is requested. In other words, a BSI request may trigger transmission of a BSI report.

The transmitting terminal may transmit the BM-RS to the receiving terminal using the resource(s) selected in S901 (S903). The receiving terminal may generate the BSI by performing a measurement operation (eg, beam measurement operation) on the BM-RS received from the transmitting terminal. The receiving terminal may transmit a BSI report to the transmitting terminal (S904). The transmitting terminal can receive a BSI report from the receiving terminal. The transmitting terminal may change (eg, determine, set) the transmission beam of the transmitting terminal based on the BSI report of the receiving terminal. The receiving terminal may change (eg, determine, set) the receiving beam of the receiving terminal 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 set.

In S901 and/or S902, the transmitting terminal may explicitly or implicitly instruct the performance of an operation to change (e.g., determine, set) the reception beam of the receiving terminal based on the BM operation. In this case, the receiving terminal may perform a receiving beam change (e.g., decision, setting) 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 (eg, determine, set) operation after transmission of the BSI report.

BSI requests can be transmitted by standalone SCI or two-level SCI. In other words, BSI requests may be included in SCI. The BSI request and BM-RS may be transmitted in the same slot (e.g., the same SL slot). Alternatively, the BSI request and BM-RS may be transmitted in different slots. For example, the BSI request may be transmitted in slot #n, and the BM-RS may be transmitted in slot #m after slot #n. Each of n and m may be a natural number. m can be larger than n. If the BM-RS is transmitted after transmission of the BSI request, the BSI request (or SCI including the BSI request) includes resource information for transmission of the BM-RS (e.g., time resource information and/or frequency resource information) ) may include. Resource(s) for transmission of BM-RS may belong to the resources selected in S901. Additionally, the BSI request (or SCI including the BSI request) may include resource information (eg, time resource information and/or frequency resource information) for transmission of the BSI report. Resource(s) for transmission of the BSI request may belong to the resources selected in S901.

The BSI request (or SCI including the BSI request) may include information indicating that the resource indicated by the BSI request (or the SCI) is a resource for BM-RS transmission. The terminal(s) performing blind decoding on PSCCH (e.g., SCI) may determine that the BM-RS is transmitted in a specific resource area based on the indication information included in the BSI request (or SCI). .

Each of the BM signals (e.g., BSI Request, BM-RS, and/or BSI Report) has a resource pool (RP) (SL-RP) or BM allocated for SL communication (e.g., SL data communication). It may be transmitted and received within at least one RP among dedicated RPs for operation (e.g., BM-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. 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 in 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: Two BM signals (e.g., BSI request, BSI report) are transmitted within SL-RP, and one BM signal (e.g., BM-RS) is transmitted through SL-RP or BM-RP. Selectively sent within

- Case 4: 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 4, 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 only BM-RS is transmitted through BM-RP in Case 2 or Case 3, the problem of Case 1 (e.g., traffic congestion within SL-RP) can be alleviated. In case 2 or case 3, the BSI request is transmitted through the SL-RP, so the receiving terminal performs monitoring operations (e.g., decoding operation, blind decoding operation) only on the SL-RP to detect the BSI request, The problem in case 4 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).

For convenience of explanation in this disclosure, it may be assumed that the BSI request is transmitted via SCI, and the BSI request (or SCI including the BSI request) includes time and/or frequency resource information for transmission of the BM-RS. It may be assumed to include, and the BSI request (or, SCI including the BSI request) includes information indicating that the resource indicated by the BSI (or the SCI) is a resource for BM-RS transmission. It can be assumed that The terminal can obtain the SCI by performing blind decoding on the PSCCH, and the slot scheduled by the SCI (e.g., scheduled resource, reserved slot) is used to transmit data based on the indication information included in the SCI. You can check whether it is a resource for or a resource for BM-RS transmission. Resources for transmission of data or BM-RS can be allocated in the slot where SCI is transmitted. Alternatively, resources for data or BM-RS transmission may be allocated in a slot following the slot in which SCI is transmitted.

Alternatively, BM-RNTI for BM operation can be set. If the UE succeeds in decoding the SCI using the BM-RNTI, it may determine that the resource indicated by the SCI is a resource for BM operation (eg, BM-RS transmission). If the terminal succeeds in decoding the SCI using another RNTI (eg, SL-RNTI) instead of the BM-RNTI, it may determine that the resource indicated by the SCI is a resource for data transmission.

For convenience of explanation in this disclosure, it may be assumed that a pre-emption operation in SL communication is performed as follows. Preemption operation can be enabled or disabled for each RP set in each terminal. When the preemption operation is enabled, the first terminal performing a resource sensing/selection operation in the RP with the preemption operation enabled performs a blind decoding operation on the PSCCH to detect the SCI of the second terminal (e.g., 1 SCI) can be obtained. “If the priority indicated by the SCI of the second terminal is higher than the priority of the first terminal, and the resources reserved by the SCI of the second terminal overlap with the reserved resources of the first terminal,” the first terminal is itself Reserved resources can be released. The preemption operation may be performed based on the priority of transmission data.

In each case, signaling operations for data transmission, signaling operations for BM operations, resource sensing/selection operations for transmission of BM signals, etc. will be described below. In each case, when a terminal's reservation resource (e.g., selected resource, candidate resource) overlaps with another terminal's reservation resource (e.g., selected resource, candidate resource), the operation of the terminal will be described below. . The reserved resource of another terminal may be confirmed based on the information element(s) included in the SCI of the other terminal obtained by a blind decoding operation for the PSCCH.

In each case, if the preemption operation is not performed within the RP (for example, if the preemption operation is disabled), resources for transmission of data and/or BM signals are reserved by existing resource sensing/selection operations. It can be. The terminal can select resources not reserved by other terminals by performing a resource sensing/selection operation, and can transmit data and/or BM signals using the selected resources. In this disclosure, the resource sensing/selection operation may be referred to as a resource sensing and selection (RSS) operation. “Performing an RSS operation” means “an operation in which the terminal checks idle resources (e.g., available resources, candidate resources) by performing a resource sensing operation” or “the terminal performs a resource sensing operation.” This may mean “checking child resources (e.g., available resources, candidate resources) and selecting one or more resources among the child resources by performing a resource selection operation.”

[Case 1: 3 BM signals transmitted within SL-RP]

When BM signals are transmitted within the SL-RP, there may be a terminal that performs an RSS operation for data transmission and a terminal that performs an RSS operation for BM signal transmission.

If the preemption operation is supported, the RSS operation may be performed considering the priority of data transmission and/or the priority of BM signal transmission.

(Method 1) The priority of BM signal transmission may be higher than the priority of data transmission, and the RSS operation may be performed considering the priority.

(Method 2) The priority of data transmission may be higher than the priority of BM signal transmission, and the RSS operation may be performed considering the priority.

(Method 3) The priority of BM signal transmission can be defined, the priority of BM signal transmission can be compared with the priority of data transmission, and the RSS operation can be performed considering the result of the priority comparison. . If the priority of BM signal transmission is the same as the priority of data transmission, it may be assumed that BM signal transmission or data transmission has a high priority.

The priority of data (eg, SL data) may be indicated by a priority field included in the first stage SCI. A field indicating the priority of data may be referred to as a D(data)-priority field. The size of the D-priority field can be 3 bits, and 8 priorities can be expressed by the D-priority field. The D-priority field included in the first stage SCI may indicate one priority among eight priorities.

A BM-priority field indicating the priority of the BM signal can be defined. The size of the BM-Priority field can be defined as 3 bits. In this case, the BM-Priority field can express 8 priorities. The BM-Priority field may be included in the SCI. In other words, the SCI may include a D-priority field and a BM-priority field, and within the SCI, the D-priority field and the BM-priority field can be distinguished. Alternatively, the BM-priority field may not be set separately, and the priority field (eg, D-priority field) may be used to indicate the priority of the BM signal. In this case, the SCI including the priority field may include information explicitly or implicitly indicating that the SCI is an SCI for transmission of BM signals. A new first-level SCI format (eg, SCI Format 1-B) for transmission of BM signals may be defined. Alternatively, the priority field included in the SCI decoded by SL-RNTI can be interpreted as a D-priority field, and the priority field included in SCI decoded by BM-RNTI can be interpreted as a BM-priority field. It can be interpreted as:

The size of the priority field (eg, D-priority field and/or BM-priority field) may be smaller or larger than 3 bits. The number of priority levels for data may be different from the number of priority levels for the BM signal. In this case, for comparison between the priority levels for the data and the priority levels for the BM signal, relative priority mapping can be performed between the data and the BM signal, and the priority of the data and the priority of the BM signal are Comparison can be made based on the results of priority mapping. For example, a specific priority level of the BM signal can be mapped to a certain priority level of data, and the priority of the data and the priority of the BM signal can be compared based on the results of the priority mapping. The result information of priority mapping can be set to the terminal(s) through signaling.

In method 1, the priority of BM signal transmission may be higher than the priority of data transmission. In this case, operations based on RSS results can be performed according to Table 4 below. In Table 4 below, “the signal that the first terminal performing the RSS operation wants to transmit (e.g., priority of the signal)” and/or “the reserved resource (e.g., occupied resource) confirmed by the RSS operation ), the RSS operation and/or preemption operation considering the signal (e.g., signal priority) that another terminal wants to transmit will be explained. Resources selected by the RSS operation of the first terminal (or candidate resources determined by the RSS operation) may include reserved resources (eg, occupied resources) of another terminal. The reserved resource of another terminal and/or the type of signal transmitted on the reserved resource (eg, data or BM signal) may be confirmed based on the information element(s) included in the SCI of the other terminal.

Referring to Table 4, when both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are BM signals, the first terminal The terminal can decide whether to perform a preemption operation based on the priorities of BM signals. If the priority of the BM signal of the first terminal is higher than that of the BM signal of the other terminal, the first terminal may not release the resources selected by the RSS operation and may transmit the BM signal on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the BM signal of the first terminal is lower than the priority of the BM signal of the other terminal, the first terminal may release the resources selected by the RSS operation and do not transmit the BM signal in the released resources. It may not be possible. In other words, the first terminal can perform a preemption operation. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations.

Referring to Table 4, "If the signal that the first terminal performing the RSS operation wants to transmit is a BM signal, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is data," BM signal Since the priority of is higher than the priority of data, the first terminal may not perform the preemption operation. In other words, the first terminal may not release the resources selected by the RSS operation and may transmit the BM signal on the selected resources.

Referring to Table 4, "If the signal that the first terminal performing the RSS operation wants to transmit is data, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is a BM signal," BM signal Since the priority of is higher than the priority of data, the first terminal can perform a preemption operation. In other words, the first terminal may release resources selected by the RSS operation and may not transmit data on the released resources. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations.

Referring to Table 4, when both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are data, the first terminal can determine whether to perform the preemption operation based on the priority of the data. If the priority of the data of the first terminal is higher than that of the data of other terminals, the first terminal may not release the resources selected by the RSS operation and may transmit data from the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the data of the first terminal is lower than that of the data of the other terminal, the first terminal may release the resources selected by the RSS operation and may not transmit data on the released resources. . In other words, the first terminal can perform a preemption operation. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations.

In method 2, the priority of data transmission may be higher than the priority of BM-RS transmission. In this case, operations based on RSS results can be performed according to Table 5 below. In Table 5 below, “the signal that the first terminal performing the RSS operation wants to transmit (e.g., priority of the signal)” and/or “the reserved resource (e.g., occupied resource) confirmed by the RSS operation ), the RSS operation and/or preemption operation considering the signal (e.g., signal priority) that another terminal wants to transmit will be explained. Resources selected by the RSS operation of the first terminal (or candidate resources determined by the RSS operation) may include reserved resources (eg, occupied resources) of another terminal. The reserved resource of another terminal and/or the type of signal transmitted on the reserved resource (eg, data or BM signal) may be confirmed based on the information element(s) included in the SCI of the other terminal.

Referring to Table 5, if both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are BM signals, the first terminal The terminal can decide whether to perform a preemption operation based on the priorities of BM signals. If the priority of the BM signal of the first terminal is higher than that of the BM signal of the other terminal, the first terminal may not release the resources selected by the RSS operation and may transmit the BM signal on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the BM signal of the first terminal is lower than the priority of the BM signal of the other terminal, the first terminal may release the resources selected by the RSS operation and do not transmit the BM signal in the released resources. It may not be possible. In other words, the first terminal can perform a preemption operation. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations.

Referring to Table 5, "If the signal that the first terminal performing the RSS operation wants to transmit is a BM signal, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is data," BM signal Since the priority of is lower than the priority of data, the first terminal can perform a preemption operation. In other words, the first terminal may release resources selected by the RSS operation and may not transmit BM signals on the released resources. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations.

Referring to Table 5, "If the signal that the first terminal performing the RSS operation wants to transmit is data, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is a BM signal," BM signal Since the priority of is lower than the priority of the data, the first terminal may not perform the preemption operation. In other words, the first terminal may not release the resources selected by the RSS operation and may transmit data on the selected resources.

Referring to Table 5, when both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are data, the first terminal Can determine whether to perform the preemption operation based on the priority of the data. If the priority of the data of the first terminal is higher than that of the data of the other terminals, the first terminal may not release the resources selected by the RSS operation and may transmit data from the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the data of the first terminal is lower than that of the data of the other terminal, the first terminal may release the resources selected by the RSS operation and may not transmit data on the released resources. . In other words, the first terminal can perform a preemption operation. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations.

In method 3, the priority of BM signal transmission can be defined, the priority of BM signal transmission can be compared with the priority of data transmission, and the RSS operation can be performed considering the result of the priority comparison. If the priority of BM signal transmission is the same as the priority of data transmission, it may be assumed that either BM signal transmission or data transmission has a higher priority. The number of priority levels of the BM signal and the number of priority levels of data may be defined to be the same. A low value of the priority level can be defined as having high priority, and a high value of the priority level can be defined as having low priority.

If the priority level of the BM signal and the priority level of the data are the same, one of the BM signals or data may be determined to have high priority, and transmission of the BM signal or data determined to have high priority may be It can be done. In Table 6 below, if the priority level of the BM signal and the priority level of the data are the same, the BM signal can be assumed to have higher priority than the data. Resources selected by the RSS operation of the first terminal (or candidate resources determined by the RSS operation) may include reserved resources (eg, occupied resources) of another terminal. The reserved resource of another terminal and/or the type of signal transmitted on the reserved resource (eg, data or BM signal) may be confirmed based on the information element(s) included in the SCI of the other terminal.

Referring to Table 6, if both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are BM signals, the first terminal The terminal can decide whether to perform a preemption operation based on the priorities of BM signals. If the priority of the BM signal of the first terminal is higher than that of the BM signal of the other terminal, the first terminal may not release the resources selected by the RSS operation and may transmit the BM signal on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the BM signal of the first terminal is lower than the priority of the BM signal of the other terminal, the first terminal may release the resources selected by the RSS operation and do not transmit the BM signal in the released resources. It may not be possible. In other words, the first terminal can perform a preemption operation. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations.

Referring to Table 6, "the signal that the first terminal performing the RSS operation wants to transmit is the BM signal, the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is data, and method 3 is applied. In this case, the first terminal may decide whether to perform the preemption operation based on the comparison result of the priority between the BM signal and the data. If the priority of the BM signal of the first terminal is higher than the priority of the data of other terminals, the first terminal may not release the resources selected by the RSS operation and may transmit the BM signal on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the BM signal of the first terminal is lower than the priority of the data of other terminals, the first terminal may release the resources selected by the RSS operation and may not transmit the BM signal on the released resources. You can. In other words, the first terminal can perform a preemption operation. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations. If the priority of the BM signal of the first terminal is the same as the priority of the data of the other terminal, the first terminal may not release the resources selected by the RSS operation because BM signal transmission takes priority over data transmission, and the selected resources BM signals can be transmitted. In other words, the first terminal may not perform the preemption operation.

Referring to Table 6, "the signal that the first terminal performing the RSS operation wants to transmit is data, the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is the BM signal, and method 3 is applied. In this case, the first terminal may decide whether to perform the preemption operation based on the comparison result of the priority between the data and the BM signal. If the priority of the data of the first terminal is higher than the priority of the BM signal of the other terminal, the first terminal may not release the resources selected by the RSS operation and may transmit data on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the data of the first terminal is lower than the priority of the BM signal of the other terminal, the first terminal may release the resources selected by the RSS operation and may not transmit data on the released resources. there is. In other words, the first terminal can perform a preemption operation. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations. If the priority of the data of the first terminal is the same as the priority of the BM signal of the other terminal, the first terminal can release the resources selected by the RSS operation because BM signal transmission takes priority over data transmission, and the released resources Data may not be transmitted. In other words, the first terminal can perform a preemption operation. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations.

Referring to Table 6, when both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are data, the first terminal Can determine whether to perform the preemption operation based on the priority of the data. If the priority of the data of the first terminal is higher than that of the data of the other terminals, the first terminal may not release the resources selected by the RSS operation and may transmit data from the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, if the priority of the data of the first terminal is lower than that of the data of the other terminal, the first terminal may release the resources selected by the RSS operation and may not transmit data on the released resources. . In other words, the first terminal can perform a preemption operation. In this case, the first terminal can transmit data from another resource. Other resources may be re-selected by RSS operations.

A variation of Scheme 1, an extension of Scheme 1, a variation of Scheme 2, an extension of Scheme 2, a variation of Scheme 3, and/or an extension of Scheme 3 may be applied. A combination of Scheme 1, Scheme 2, and/or Scheme 3 may be applied.

A combination of Method 1 and Method 2 (hereinafter referred to as “Combination 1-2”) can be applied. When combination 1-2 is applied, the priority of the BM signal can be indicated by a 1-bit indicator. When the 1-bit indicator is set to the first value (eg, 0), the priority of the BM signal may be higher than the priority of the data. If the 1-bit indicator is set to a second value (eg, 1), the priority of the BM signal may be lower than the priority of the data. Whether to perform the preemption operation can be determined based on the 1-bit indicator of the BM signal.

When transmission of BM signals (e.g., a first BM signal and a second BM signal) are required on the same resources, whether to perform a preemption operation depends on the priority of the first BM signal and the priority of the second BM signal. It can be decided by considering the ranking. When different terminals want to transmit BM signals on the same resources (e.g., the same reserved resources), the different terminals can decide whether to perform a preemption operation based on the 1-bit indicator of each BM signal. there is.

For example, if both “the signal that the first terminal that performs the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource identified by the RSS operation” are both BM signals, the first terminal The 1-bit indicator of the BM signal of the first terminal can be compared with the 1-bit indicator of the BM signal of the other terminal. “If the 1-bit indicator of the BM signal of the first terminal is the first value and the bit indicator of the BM signal of the other terminal is the second value,” the first terminal transmits the BM signal of the first terminal when transmitting the BM signal of the other terminal It may be determined to have higher priority, the resources selected by the RSS operation may not be released, and the BM signal may be transmitted on the selected resources. In other words, the first terminal may not perform the preemption operation. On the other hand, when "the 1-bit indicator of the BM signal of the first terminal is the second value, and the bit indicator of the BM signal of the other terminal is the first value," the first terminal transmits the BM signal of the other terminal to the BM of the first terminal. It may be determined that priority is given to signal transmission, resources selected by the RSS operation may be released, and BM signals may not be transmitted on the released resources. In other words, the first terminal can perform a preemption operation. In this case, the first terminal may transmit the BM signal on another resource. Other resources may be re-selected by RSS operations.

Any specific method among the methods described above may be used. The base station can set the method used for each RP to the terminal(s) through signaling. For example, enable/disable indicators for each of method 1, method 2, and method 3 may be set for each RP. Whether to perform the preemption operation can be determined by considering the enable/disable indicator. The base station may transmit an enable indicator or a disable indicator for preemption operation (e.g., preemption operation for each RP) to the terminal(s) through signaling. Enabling/disabling of preemption operation between data transmissions on the same resource, enabling/disabling of preemption operation between transmissions of BM signals on the same resource, and preemption operation between data transmission and BM signal transmission on the same resource. Enable/disable can be set for each RP. The enable/disable settings of preemption operation for each RP can be defined as shown in Table 7 below. The base station can pre-configure the configuration methods defined in Table 7 to the terminal(s) through signaling (e.g., RRC signaling) and signal information indicating one of the configuration methods (e.g., It can be transmitted to the terminal(s) through MAC signaling and/or PHY signaling.

Referring to Table 7, enabling/disabling of preemption operation between data transmissions on the same resource, enabling/disabling of preemption operation between transmissions of BM signals on the same resource, and data transmission and BM on the same resource. Enabling/disabling of preemption operation between signal transmissions can be set for one RP. Enabling/disabling of preemption operation between data transmissions on the same resource, enabling/disabling of preemption operation between transmissions of BM signals on the same resource, and preemption operation between data transmission and BM signal transmission on the same resource. Eight configuration methods (eg, configuration methods #1 to #8) can be defined depending on the enable/disable of .

In configuration scheme #1, preemption operation between data transmissions on the same resource can be enabled, preemption operation between transmissions of BM signals on the same resource can be enabled, and data transmission and BM on the same resource Preemption operation between signal transmissions may be enabled. In configuration scheme 8, the preemption operation between data transmissions on the same resource can be disabled, the preemption operation between transmissions of BM signals on the same resource can be disabled, and the preemption operation between data transmissions and BM signals on the same resource can be disabled. Preemption operation between transmissions can be disabled. In other words, the preemption operation may not be performed in configuration method #8.

In configuration method #7, “if the signal that the first terminal performing the RSS operation wants to transmit is a BM signal, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is data” or “RSS If the signal that the first terminal performing the operation wants to transmit is data, and the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation is a BM signal, the preemption operation can be enabled. In this case, the first terminal may decide whether to perform the preemption operation based on the comparison result of priorities between the BM signal and data.

In configuration method #7, both “the signal that the first terminal performing the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit in the reserved resource confirmed by the RSS operation” are either BM signals or all data. In this case, preemption operation may be disabled. In this case, the first terminal may not perform the preemption operation regardless of the priorities of the BM signal and data.

In another setting method in Table 7, the first terminal can determine whether to perform the preemption operation based on the enable/disable of the preemption operation. The examples in Table 4, the examples in Table 5, and/or the examples in Table 6 may be applied to the examples in Table 7. Additionally, modifications, extensions, and/or combinations of the examples in Table 4, the examples in Table 5, and/or the examples in Table 6 may be applied to the examples in Table 7.

[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 ]

Specific preemption operations may be supported, and RSS operations within SL-RP and/or BM-RP may be performed based on the priority of the BM signal. BSI request and/or BSI report may be transmitted in SL-RP, and BM-RS may be transmitted in BM-RP. In SL-RP and/or BM-RP, preemption operation may be the default operation. Alternatively, preemption operation may be enabled or disabled in SL-RP and/or BM-RP. As in case 1 to which the embodiment of Table 7 is applied, enabling/disabling of preemption operation between data transmissions on the same resource, enabling/disabling of preemption operation between transmissions of BM signals on the same resource, and Enable/disable of preemption operation between data transmission and BM signal transmission in the resource can be set for SL-RP. Enabling/disabling of preemption operation between transmissions of BM signals on the same resource can be set for BM-RP.

Embodiments of Table 4 in Case 1, “Variations, Extensions, and/or Combinations of Embodiments of Table 4”, Table 5, when preemption operations are set to be performed within SL-RP and/or BM-RP Examples of, “Variations, Extensions, and/or Combinations of the Examples of Table 5”, Examples of Table 6, “Variations, Extensions, and/or Combinations of the Examples of Table 6”, Examples of Table 7 Examples, and/or “variations, extensions, and/or combinations of the examples in Table 7” may apply to Case 2.

Since only BM-RS is transmitted in BM-RP, the preemption operation in BM-RP includes "the signal that the first terminal performing the RSS operation wants to transmit" and "the signal that other terminals transmit on the reserved resource confirmed by the RSS operation." This can be performed when the “signals asking to do this” are all BM signals. For example, the first terminal performs a preemption operation based on the comparison result of the priority between the BM signal (e.g., BM-RS) of the first terminal and the BM signal (e.g., BM-RS) of the other terminal. You can decide whether to perform or not. The priority of the BM signal may be indicated by an information element included in the BSI request (or SCI). In case 1, a pre-emption method between BM signals, a modification of the pre-amplification method, an extension of the pre-amplification method, and/or a combination of the pre-amplification method and another method are used to pre-amplify the BM-RP in case 2. It can be applied.

[Case 3: Two BM signals (e.g., BSI request, BSI report) are transmitted within SL-RP, and one BM signal (e.g., BM-RS) is transmitted through SL-RP or BM-RP. Selectively transmitted within]

Specific preemption operations may be supported, and RSS operations within SL-RP and/or BM-RP may be performed based on the priority of the BM signal. The BSI request and/or BSI report may be transmitted in the SL-RP, and the BM-RS may be selectively transmitted in the SL-RP or BM-RP. In SL-RP and/or BM-RP, preemption operation may be the default operation. Alternatively, preemption operation may be enabled or disabled in SL-RP and/or BM-RP.

The preemption method in Case 1 and/or Case 2 may be applied to Case 3. In case 3, when the BM-RS is transmitted within the SL-RP, the embodiment of case 1, a modification to the embodiment of case 1, an extension to the embodiment of case 1, and/or a different embodiment from the embodiment of case 1 Combinations of embodiments may be applied. In case 3, when the BM-RS is transmitted within the BM-RP, the embodiment of case 2, a variation of the embodiment of case 2, an extension of the embodiment of case 2, and/or different from the embodiment of case 2 Combinations of embodiments may be applied. In this case, the BSI request (eg, SCI including BSI request) may include information indicating the RP (eg, BM-RP or SL-RP) to which the BM-RS is transmitted.

[Case 4: Three BM signals (e.g., BSI request, BM-RS, BSI report) are transmitted within BM-RP]

Specific preemption operations may be supported, and RSS operations within BM-RP may be performed based on the priority of the BM signal. In BM-RP, preemption operation may be the default operation. Alternatively, preemption operation may be enabled or disabled in BM-RP. All BM signals can be transmitted within the BM-RP, and the following operations can be performed when the preemption operation is enabled in the BM-RP.

In BM-RP, the preemption operation is performed when both “the signal that the first terminal performing the RSS operation wants to transmit” and “the signal that the other terminal wants to transmit on the reserved resource confirmed by the RSS operation” are BM signals. It can be done. For example, the first terminal may determine whether to perform a preemption operation based on a comparison result of priorities between the BM signal of the first terminal and the BM signal of another terminal. In Case 1, a pre-emption method between BM signals, a modification of the pre-amplification method, an extension of the pre-amplification method, and/or a combination of the pre-amplification method and other methods may be applied to Case 4.

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, the methods are preferably 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)

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

   determining resources by performing a resource sensing and selection (RSS) operation;

   Comparing priorities between a first signal to be transmitted by the first UE in the resource and a second signal to be transmitted by the second UE in the resource;

   determining whether to perform a pre-emption operation for the resource based on a result of comparing the priorities; and

   Comprising the step of performing sidelink (SL) communication based on whether the preemption operation is performed.

   Method of first UE.
2. In claim 1,

   The method of the first UE is:

   It further includes receiving an enable/disable indicator of the preemption operation from the base station,

   When the enable/disable indicator indicates enabling of the preemption operation, the first UE determines whether to perform the preemption operation for the resource.

   Method of first UE.
3. In claim 1,

   The method of the first UE is:

   Enabling/disabling of the preemption operation between SL data transmissions, enabling/disabling of the preemption operation between BM signal transmissions for beam management (BM) operation, and the enabling/disabling of the preemption operation between SL data transmission and BM signal transmission It further includes receiving setting information indicating enabling/disabling of the preemption operation from the base station,

   Whether to perform the preemption operation for the resource is determined based on the configuration information,

   Method of first UE.
4. In claim 1,

   Enabling or disabling the preemption operation is set for each RP (resource pool),

   Method of first UE.
5. In claim 1,

   The first priority of the first signal is included in the first SCI (sidelink control information) transmitted by the first UE, and the second priority of the second signal is included in the second sidelink control information (SCI) transmitted by the second UE. Included in SCI,

   Method of first UE.
6. In claim 1,

   Each of the first signal and the second signal is a BM signal or SL data, and the SCI for transmission of the BM signal is distinct from the SCI for transmission of the SL data,

   Method of first UE.
7. In claim 6,

   The SL data is transmitted in the SL-RP, the BM signal is transmitted in the BM-RP or the SL-RP set for BM operation, and the BM-RP is set to be distinguished from the SL-RP,

   Method of first UE.
8. In claim 1,

   “If the priority of the BM signal is higher than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource is not performed, The BM signal is transmitted from the resource,

   Method of first UE.
9. In claim 1,

   “If the priority of the BM signal is higher than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource is performed, and the The SL data is not transmitted in the resource,

   Method of first UE.
10. In claim 1,

    “If the priority of the BM signal is lower than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource is performed, and The BM signal is not transmitted in the resource,

    Method of first UE.
11. In claim 1,

    “If the priority of the BM signal is lower than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource is not performed, The SL data is transmitted from the resource,

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

    Contains at least one processor,

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

    determine resources by performing a resource sensing and selection (RSS) operation;

    compare priorities between a first signal to be transmitted by the first UE in the resource and a second signal to be transmitted by the second UE in the resource;

    determine whether to perform a pre-emption operation for the resource based on a comparison result of the priorities; and

    causing sidelink (SL) communication to be performed based on whether the preemption operation is performed,

    1st U.E.
13. In claim 12,

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

    Further causing an enable/disable indicator of the preemption operation to be received from the base station,

    When the enable/disable indicator indicates enabling of the preemption operation, the first UE determines whether to perform the preemption operation for the resource.

    1st U.E.
14. In claim 12,

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

    Enabling/disabling of the preemption operation between SL data transmissions, enabling/disabling of the preemption operation between BM signal transmissions for BM (beam management) operation, and the enabling/disabling of the preemption operation between SL data transmission and BM signal transmission further causing to receive configuration information indicating enabling/disabling of the preemption operation from the base station,

    Whether to perform the preemption operation for the resource is determined based on the configuration information,

    1st U.E.
15. In claim 12,

    Enabling or disabling the preemption operation is set for each RP (resource pool),

    1st U.E.
16. In claim 12,

    The first priority of the first signal is included in the first SCI (sidelink control information) transmitted by the first UE, and the second priority of the second signal is included in the second sidelink control information (SCI) transmitted by the second UE. Included in SCI,

    1st U.E.
17. In claim 12,

    “If the priority of the BM signal is higher than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource is not performed, The BM signal is transmitted from the resource,

    1st U.E.
18. In claim 12,

    “If the priority of the BM signal is higher than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource is performed, and the The SL data is not transmitted in the resource,

    1st U.E.
19. In claim 12,

    “If the priority of the BM signal is lower than that of the SL data, the first signal is the BM signal, and the second signal is the SL data,” the preemption operation for the resource is performed, and The BM signal is not transmitted in the resource,

    1st U.E.
20. In claim 12,

    “If the priority of the BM signal is lower than that of the SL data, the first signal is the SL data, and the second signal is the BM signal,” the preemption operation for the resource is not performed, The SL data is transmitted from the resource,

    1st U.E.

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