Bypass communication method and user equipment

Abstract

The embodiment of the invention provides a bypass communication method and user equipment. The method comprises the following steps: determining configuration parameters of a periodic SL CSI-RS window; determining at least one resource for SL CSI-RS transmission, the at least one resource being within the periodic SL CSI-RS window; sending the SL CSI-RS to the second UE on at least one resource; and the measurement report based on the SL CSI-RS is received from the second UE, so that the measurement report of bypass communication for the FR2 frequency band is realized, and beam management of the bypass communication is facilitated.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a bypass communication method and a user equipment (UE). Background Art

[0002] In order to meet the increased demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems."

[0003] 5G communication systems are implemented in higher frequency (millimeter wave, mmWave) bands, such as the 60GHz band, to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems.

[0004] In addition, in the 5G communication system, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0006] In the fifth generation (5G) New Radio (NR) system, bypass communication is currently only available for low frequency bands (i.e., FR1 band with a carrier frequency range of 450MHz to 6000MHz). Due to the severe shortage of FR1 spectrum resources, it is necessary to support bypass communication in high frequency bands (i.e., FR2 band with a carrier frequency range of 24250MHz to 52600MHz) in the Rel-18 version of the bypass communication system. However, in the FR2 scenario of bypass communication, the technical details of beam reporting are still unclear. Summary of the invention

[0007] The purpose of the embodiments of the present application is to solve the problem of how to perform beam reporting related to bypass communication.

[0008] According to one aspect of an embodiment of the present application, a method performed by a first UE in a communication system is provided, the method including:

[0009] Determining configuration parameters of a periodic SL CSI-RS window;

[0010] determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within a periodic SL CSI-RS window;

[0011] sending the SL CSI-RS to the second UE on at least one resource;

[0012] A SL CSI-RS based measurement report is received from the second UE.

[0013] Optionally, the configuration parameters of the periodic SL CSI-RS window are determined based on at least one of the following methods:

[0014] receiving configuration parameters of a periodic SL CSI-RS window from a base station;

[0015] Preconfigured bypass parameters;

[0016] Configuration parameters of a periodic SL CSI-RS window are received from the second UE.

[0017] Optionally, the configuration parameters of the periodic SL CSI-RS window include at least one of the following:

[0018] The period size of the SL CSI-RS window;

[0019] The starting position of the SL CSI-RS window;

[0020] The length of the SL CSI-RS window;

[0021] The index number of one or more SL CSI-RS resources transmitted within the SL CSI-RS window;

[0022] The index number of one or more SL CSI-RS resource sets transmitted within the SL CSI-RS window;

[0023] The maximum number of SL CSI-RS resources allowed to be transmitted within the SL CSI-RS window;

[0024] The maximum number of SL CSI-RS resource sets allowed to be transmitted within the SL CSI-RS window;

[0025] The maximum number of SL CSI-RS time units allowed to be transmitted within the SL CSI-RS window.

[0026] Optionally, the starting position of the SL CSI-RS window is determined based on at least one of the following:

[0027] An identity number ID of the first UE;

[0028] ID of the second UE.

[0029] Optionally, the length or minimum length of the SL CSI-RS window is determined based on at least one of the following:

[0030] The number of SL CSI-RS resources configured for transmission within the SL CSI-RS window;

[0031] The number of SL CSI-RS resource sets configured for transmission within the SL CSI-RS window;

[0032] The number of SL CSI-RS time units configured for transmission within the SL CSI-RS window;

[0033] Subcarrier spacing size.

[0034] Optionally, the method further comprises:

[0035] A direct communication interface radio resource control PC5 RRC signaling is sent to the second UE to indicate the configuration parameters of the periodic SL CSI-RS window.

[0036] Optionally, the method further comprises:

[0037] A bypass media access control layer control element SL MAC CE is sent to the second UE to activate or deactivate the periodic SLCSI-RS window.

[0038] Optionally, sending a SL MAC CE to a second UE includes:

[0039] Sending a physical bypass shared channel PSSCH to the second UE, where the PSSCH carries a SL MAC CE for activating or deactivating a periodic SLCSI-RS window;

[0040] Receiving a physical bypass feedback channel PSFCH from the second UE, where the PSFCH carries confirmation ACK information corresponding to the PSSCH transmission;

[0041] The first time unit or the first bypass time unit that meets the first preset interval after the time unit in which the PSFCH is transmitted is used as the starting position of the SL CSI-RS window.

[0042] Optionally, determining at least one resource for SL CSI-RS transmission includes:

[0043] At least one resource for SL CSI-RS transmission is determined based on a resource subset, wherein the resource subset is determined based on a resource selection window, and the resource selection window is a most recent SL CSI-RS window.

[0044] Optionally, the resource selection window is a most recent SL CSI-RS window after a preset time interval is satisfied.

[0045] Optionally, determining at least one resource for SL CSI-RS transmission based on the resource subset includes:

[0046] In the case of configured Mode 2 resource allocation, the upper layer requests the physical layer to determine a resource subset for SL CSI-RS transmission, the physical layer determines all candidate resources in the most recent SL CSI-RS window after the request moment as the initial set of candidate resources, excludes candidate resources that meet preset conditions in the initial set based on sensing, and ensures that the number of remaining candidate resources is not less than a fourth preset number, determines the remaining set of candidate resources as a resource subset, reports the determined resource subset to the upper layer, and the upper layer selects at least one resource from the resource subset for SL CSI-RS transmission.

[0047] Optionally, each periodic SL CSI-RS window corresponds to one measurement report, and the measurement report is carried by the SL MACCE.

[0048] Optionally, the measurement report corresponding to the SL CSI-RS window of each period is sent by the second UE within a first preset delay boundary after at least one of the following time units:

[0049] The starting position of the SL CSI-RS window;

[0050] The end position of the SL CSI-RS window;

[0051] The time unit where the first SL CSI-RS transmission occurs within the SL CSI-RS window;

[0052] The time unit of the last SL CSI-RS transmission in the SL CSI-RS window.

[0053] Optionally, the value of the first preset delay boundary is configured by the first UE to the second UE through PC5 RRC signaling.

[0054] Optionally, the measurement report is a measurement result of the second UE on the SL CSI-RS received in the SL CSI-RS window, and the SL CSI-RS reception of the second UE in the SL CSI-RS window should meet at least one of the following expectations:

[0055] The second UE expects to receive at least one of at least one SL CSI-RS transmission, at least one SL CSI-RS resource, and at least one SL CSI-RS resource set within the SL CSI-RS window;

[0056] The second UE expects to receive at least one of at least a first preset number of SL CSI-RS transmissions, at least a second preset number of SL CSI-RS resources, and at least a third preset number of SL CSI-RS resource sets within the SL CSI-RS window.

[0057] Optionally, the method further comprises:

[0058] In case of being configured with Mode 1 resource allocation, the configuration parameters of the periodic SL CSI-RS window are reported to the base station.

[0059] Optionally, the method further comprises:

[0060] In case of being configured with Mode 1 resource allocation, a scheduling request SR is triggered to request at least one resource for SL CSI-RS transmission from the base station.

[0061] Optionally, the SR configuration for requesting SL CSI-RS transmission resources and the SR configuration for requesting PSSCH transmission resources are configured separately.

[0062] Optionally, the method further comprises:

[0063] If the resources allocated by the base station for SL CSI-RS transmission are within the SL CSI-RS window, the bypass grant corresponding to the resources is determined to be valid;

[0064] If the resources allocated by the base station for SL CSI-RS transmission are outside the SL CSI-RS window, the bypass grant corresponding to the resources is determined to be invalid.

[0065] Optionally, the priority of the SR corresponds to the priority of the SL CSI-RS transmission, and the priority of the SL CSI-RS transmission is predefined.

[0066] Optionally, triggering the SR to request the base station for at least one resource for SL CSI-RS transmission includes:

[0067] When a second preset interval is met before the SL CSI-RS window of each period, the SR is triggered to request the base station for resources for SL CSI-RS transmission.

[0068] Optionally, the SL CSI-RS is received by the second UE within a second SL DRX activation time, and the second SL DRX activation time includes at least one of the following time periods:

[0069] if a fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window are not received, a time period corresponding to the SL CSI-RS window;

[0070] If a fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received, a time period from the start position of the SL CSI-RS window to the time when the fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received;

[0071] The time period from the starting position of the SL CSI-RS window to the time when the last SL CSI-RS transmission in the SL CSI-RS window is received, wherein the bypass control information SCI associated with the SL CSI-RS transmission indicates whether the SL CSI-RS transmission is the last SL CSI-RS transmission in the SL CSI-RS window.

[0072] Optionally, receiving a measurement report based on an SL CSI-RS from a second UE, and / or receiving a measurement report based on an SLCSI-RS cluster from a second UE includes:

[0073] Monitor the SCI sent by the second UE within the first SL DRX activation time, and the PSSCH scheduled by the SCI carries the measurement report;

[0074] Receive measurement reports based on SCI;

[0075] The first SL DRX activation time includes at least one of the following time periods:

[0076] If the measurement report is not received, the time period corresponding to the third preset delay boundary window of the measurement report;

[0077] If the measurement report is received, the time period from the start position of the third preset delay boundary window of the measurement report to the time period when the measurement report is received.

[0078] Optionally, if the SL CSI-RS transmission is configured to share a resource pool with the PSSCH transmission, there is no automatic gain control AGC symbol between the SL CSI-RS transmission and a physical bypass control channel PSCCH in the time unit where the SL CSI-RS transmission is located;

[0079] If the SL CSI-RS transmission is configured with a dedicated resource pool, an AGC symbol is reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located. The AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0080] Optionally, if the dedicated resource pool is configured as the first mode, there is no AGC symbol between two adjacent SL CSI-RS resources in the time unit;

[0081] If the dedicated resource pool is configured as the second mode, an AGC symbol is reserved between two adjacent SL CSI-RS resources in a time unit, and the AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0082] Optionally, the SL CSI-RS transmission includes multiple SL CSI-RS resources within one time unit, and each of the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0083] Optionally, the method further comprises:

[0084] Send at least one of the following configuration information to the second UE through PC5 RRC signaling:

[0085] Configuration information of multiple SL CSI-RS resources, wherein the configuration information of each SL CSI-RS resource includes at least one of an index number of the SL CSI-RS resource, a transmission configuration indicator TCI state ID, a frequency domain density, and an antenna port;

[0086] Configuration information of multiple SL CSI-RS resource sets, wherein the configuration information of each SL CSI-RS resource set includes an index number of the SL CSI-RS resource set and configuration information of multiple SL CSI-RS resources.

[0087] According to another aspect of an embodiment of the present application, there is provided another method performed by a first UE in a communication system, the method comprising:

[0088] The second UE sends a first SCI and a SL CSI-RS cluster scheduled by the first SCI, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster;

[0089] A measurement report based on the SL CSI-RS cluster is received from the second UE, wherein the measurement report is a measurement result of the second UE on the plurality of SL CSI-RSs on the indicated transmission resources.

[0090] Optionally, the first SCI is also used to indicate that resources are reserved according to a preset period and the preset period.

[0091] Optionally, the first SL CSI-RS transmission in the SL CSI-RS cluster is sent in the same time unit as the first SCI, or the first SL CSI-RS transmission in the SL CSI-RS cluster is sent after the time unit in which the first SCI is located.

[0092] Optionally, the method further comprises:

[0093] Sending a PSSCH transmission indicated by the first SCI to the second UE in the time unit where the first SCI is located;

[0094] Among them, the PSSCH carries the SL MAC CE, and the SL MAC CE is used to indicate the relevant information of the SL CSI-RS cluster.

[0095] Optionally, the relevant information of the SL CSI-RS cluster includes at least one of the following information:

[0096] Related information of measurement report corresponding to SL CSI-RS cluster;

[0097] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the transmission configuration indication TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0098] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0099] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0100] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster;

[0101] The relevant information reported by the measurement includes at least one of the following:

[0102] Information used to indicate that the reported measurement indicator type is at least one of reference received power RSRP, signal to interference plus noise ratio SINR and CSI;

[0103] Information used to indicate the number of SL CSI-RS resources reported corresponding to the best measurement indicator. Optionally, the TCI state corresponding to the first SCI transmission is pre-indicated by the first UE to the second UE.

[0104] Optionally, after the time unit in which the first SCI is located, a second SCI is also sent in the time unit in which each SL CSI-RS in the SL CSI-RS cluster is transmitted;

[0105] The second SCI is at least used to indicate the resources for SL CSI-RS transmission within the time unit where the second SCI is located, and the second SCI is also used to indicate that the resources are reserved according to a preset period and the preset period.

[0106] Optionally, the second SCI is not expected to be decoded by the second UE.

[0107] Optionally, the second SCI is used to indicate the resource for transmission of each SL CSI-RS in the SL CSI-RS cluster; or,

[0108] The second SCI is used to indicate resources for each SL CSI-RS transmission after the second SCI in the SL CSI-RS cluster.

[0109] Optionally, the first SCI includes a first-stage SCI and a second-stage SCI, the second SCI includes the first-stage SCI, and the second SCI does not include the second-stage SCI.

[0110] Optionally, the second SCI is used to assist the second UE in performing measurement based on SL CSI-RS transmission associated with the second SCI.

[0111] Optionally, after the time unit where the first SCI is located, the symbol corresponding to the SCI in the time unit where each SL CSI-RS in the SL CSI-RS cluster is transmitted is a repetition of the SL CSI-RS signal on part of the symbols in the time unit.

[0112] Optionally, the method further comprises:

[0113] ACK information sent by the second UE is received on a physical bypass feedback channel PSFCH resource corresponding to the first SCI.

[0114] Optionally, an interval between a time unit where the first SCI is located and a time unit where a first SL CSI-RS transmission is located after the time unit where the first SCI is located is greater than or equal to a third preset interval; or,

[0115] The interval between the time unit where the PSFCH corresponding to the first SCI is located and the time unit where the first SLCSI-RS is transmitted after the time unit where the first SCI is located is greater than or equal to the fourth preset interval.

[0116] Optionally, the first SCI indicates the size of frequency domain resources occupied by SL CSI-RS transmission.

[0117] Optionally, if Mode 1 resource allocation is configured, the first SCI indicates a frequency domain position of a SL CSI-RS transmission, wherein the frequency domain position is applicable to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0118] If Mode 2 resource allocation is configured, the first SCI indicates the starting frequency domain position of each SL CSI-RS transmission in the SL CSI-RS cluster.

[0119] Optionally, the first field in the first SCI and the first field in the third SCI for scheduling PSSCH are used to indicate the SCI format for scheduling SL CSI-RS cluster or the SCI format for scheduling PSSCH; or,

[0120] The first SCI and the third SCI use different demodulation reference signal DMRS sequences; or,

[0121] The first SCI and the third SCI use the same first-phase SCI format and different second-phase SCI formats.

[0122] Optionally, the method further comprises:

[0123] The smaller one of the first SCI and the third SCI is padded with zeros until the payload sizes of the two are equal.

[0124] Optionally, the measurement report corresponding to the SL CSI-RS cluster is sent by the second UE within a second preset delay boundary after at least one of the following time units:

[0125] The time unit in which the first SCI is transmitted;

[0126] The time unit in which the first SL CSI-RS in the SL CSI-RS cluster is transmitted;

[0127] The time unit in which the last SL CSI-RS in the SL CSI-RS cluster is transmitted.

[0128] Optionally, the value of the second preset delay boundary is configured by the first UE to the second UE through PC5 RRC signaling.

[0129] Optionally, the first SCI indicates at least one of the following information:

[0130] Related information of measurement report corresponding to SL CSI-RS cluster;

[0131] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0132] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0133] The relevant information reported by the measurement includes at least one of the following:

[0134] Information used to indicate that the type of the reported measurement indicator is at least one of RSRP, SINR and CSI;

[0135] Information used to indicate the number of SL CSI-RS resources reported corresponding to the best measurement indicator.

[0136] Optionally, the index number information of the SL CSI-RS resource set is indicated in a bitmap manner; or,

[0137] The index number information of at least one SL CSI-RS resource is indicated in a bitmap manner.

[0138] Optionally, the method further comprises:

[0139] In the case of Mode 1 resource allocation, the SR is triggered to request the base station for resources for SL CSI-RS cluster transmission;

[0140] Downlink control information DCI is received from the base station, where the DCI is used to indicate the transmission resources of the SL CSI-RS cluster.

[0141] Optionally, receiving a measurement report based on an SL CSI-RS from a second UE, and / or receiving a measurement report based on an SLCSI-RS cluster from a second UE includes:

[0142] Monitor the SCI sent by the second UE within the first SL DRX activation time, and the PSSCH scheduled by the SCI carries the measurement report;

[0143] Receive measurement reports based on SCI;

[0144] The first SL DRX activation time includes at least one of the following time periods:

[0145] If the measurement report is not received, the time period corresponding to the third preset delay boundary window of the measurement report;

[0146] If the measurement report is received, the time period from the start position of the third preset delay boundary window of the measurement report to the time period when the measurement report is received.

[0147] Optionally, if the SL CSI-RS transmission is configured to share a resource pool with the PSSCH transmission, there is no automatic gain control AGC symbol between the SL CSI-RS transmission and a physical bypass control channel PSCCH in the time unit where the SL CSI-RS transmission is located;

[0148] If the SL CSI-RS transmission is configured with a dedicated resource pool, an AGC symbol is reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located. The AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0149] Optionally, if the dedicated resource pool is configured as the first mode, there is no AGC symbol between two adjacent SL CSI-RS resources in the time unit;

[0150] If the dedicated resource pool is configured as the second mode, an AGC symbol is reserved between two adjacent SL CSI-RS resources in a time unit, and the AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0151] Optionally, the SL CSI-RS transmission includes multiple SL CSI-RS resources within one time unit, and each of the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0152] Optionally, the method further comprises:

[0153] Send at least one of the following configuration information to the second UE through PC5 RRC signaling:

[0154] Configuration information of multiple SL CSI-RS resources, wherein the configuration information of each SL CSI-RS resource includes at least one of an index number of the SL CSI-RS resource, a transmission configuration indicator TCI state ID, a frequency domain density, and an antenna port;

[0155] Configuration information of multiple SL CSI-RS resource sets, wherein the configuration information of each SL CSI-RS resource set includes an index number of the SL CSI-RS resource set and configuration information of multiple SL CSI-RS resources.

[0156] According to another aspect of an embodiment of the present application, a method performed by a second UE in a communication system is provided, the method including:

[0157] Determining configuration parameters of a periodic SL CSI-RS window;

[0158] determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within a periodic SL CSI-RS window;

[0159] receiving, on at least one resource, a SL CSI-RS transmitted by a first UE;

[0160] Send a SL CSI-RS based measurement report to the first UE.

[0161] According to another aspect of an embodiment of the present application, there is provided another method performed by a second UE in a communication system, the method including:

[0162] Receiving a first SCI sent by a first UE and a SL CSI-RS cluster scheduled by the first SCI, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster;

[0163] A measurement report based on the SL CSI-RS cluster is sent to the first UE, wherein the measurement report is a measurement result of the second UE on the multiple SL CSI-RSs on the indicated transmission resources.

[0164] According to another aspect of an embodiment of the present application, a user equipment is provided, the user equipment comprising:

[0165] a transceiver configured to transmit and receive signals; and

[0166] The processor is coupled to the transceiver and is configured to execute the method performed by the UE provided in the embodiment of the present application.

[0167] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method performed by the UE provided in the embodiment of the present application is implemented.

[0168] According to another aspect of an embodiment of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the method performed by the UE provided in the embodiment of the present application is implemented.

[0169] The bypass communication method and user equipment provided in the embodiments of the present application determine the configuration parameters of the periodic SL CSI-RS window; determine at least one resource for SL CSI-RS transmission, wherein at least one resource is within the periodic SL CSI-RS window; send SL CSI-RS to the second UE on at least one resource; receive measurement reports based on SL CSI-RS from the second UE, thereby realizing measurement reports of bypass communication for the FR2 frequency band, so as to perform beam management of bypass communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0170] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in describing the embodiments of the present application are briefly introduced below.

[0171] Figure 1 A schematic diagram of the overall structure of a wireless network provided in an embodiment of the present application;

[0172] Figure 2a A schematic diagram of a transmission path provided in an embodiment of the present application;

[0173] Figure 2b A schematic diagram of a receiving path provided in an embodiment of the present application;

[0174] Figure 3a A schematic diagram of the structure of a UE provided in an embodiment of the present application;

[0175] Figure 3b A schematic diagram of the structure of a base station provided in an embodiment of the present application;

[0176] Figure 4a A flowchart of a method performed by a first UE provided in an embodiment of the present application;

[0177] Figure 4b A flowchart of another method performed by a first UE provided in an embodiment of the present application;

[0178] Figure 4c A flowchart of another method performed by a first UE provided in an embodiment of the present application;

[0179] Figure 5 A schematic diagram of a first time slot structure 1 provided in an embodiment of the present application;

[0180] Figure 6 A schematic diagram of a second time slot structure provided in an embodiment of the present application;

[0181] Figure 7 A schematic diagram of a third time slot structure provided in an embodiment of the present application;

[0182] Figure 8A schematic diagram of a fourth time slot structure provided in an embodiment of the present application;

[0183] Fig. 9 A schematic diagram of a fifth time slot structure provided in an embodiment of the present application;

[0184] Fig.10 A schematic diagram of a sixth time slot structure provided in an embodiment of the present application;

[0185] Fig.11 A schematic diagram of a seventh time slot structure provided in an embodiment of the present application;

[0186] Fig.12 A schematic diagram of an eighth time slot structure provided in an embodiment of the present application;

[0187] Fig.13 A schematic diagram of a periodic SL CSI-RS window provided in an embodiment of the present application;

[0188] Fig.14 A schematic diagram of a fifth preset interval provided in an embodiment of the present application;

[0189] Fig.15 A schematic diagram of a first SCI scheduling SL CSI-RS cluster provided in an embodiment of the present application;

[0190] Fig.16 A schematic diagram of a third SCI scheduling SL CSI-RS cluster provided in an embodiment of the present application;

[0191] Fig.17 A schematic diagram of a resource allocation process provided in an embodiment of the present application;

[0192] Fig.18a A flowchart of a method performed by a second UE provided in an embodiment of the present application;

[0193] Fig.18b A flowchart of another method performed by a second UE provided in an embodiment of the present application;

[0194] Fig.19 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0195] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should be considered as exemplary only. Therefore, one of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0196] The terms and expressions used in the following specification and claims are not limited to their dictionary meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined in the appended claims and their equivalents.

[0197] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0198] The term "include" or "may include" refers to the presence of the corresponding disclosed functions, operations or components that can be used in various embodiments of the present disclosure, rather than limiting the presence of one or more additional functions, operations or features. In addition, the term "include" or "have" may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0199] The term "or" used in various embodiments of the present disclosure includes any of the listed terms and all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0200] Unless defined differently, all terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as understood by those skilled in the art of the present disclosure. Common terms as defined in dictionaries are interpreted as having meanings consistent with the context in the relevant technical field, and should not be interpreted ideally or overly formally unless explicitly defined in the present disclosure.

[0201] Figure 1 An example wireless network 100 is shown in accordance with various embodiments of the present disclosure. Figure 1 The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0202] Wireless network 100 includes gNodeB (gNB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data network.

[0203] Depending on the network type, other well-known terms such as "base station" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, other well-known terms such as "mobile station", "subscriber station", "remote terminal", "wireless terminal" or "user device" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses a gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or a commonly thought of fixed device (such as a desktop computer or vending machine).

[0204] The gNB 102 provides wireless broadband access to a network 130 for a plurality of first user equipments (UEs) within a coverage area 120 of the gNB 102. The plurality of first UEs include: UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop, a wireless PDA, etc. The gNB 103 provides wireless broadband access to the network 130 for a plurality of second UEs within a coverage area 125 of the gNB 103. The plurality of second UEs include UE 115 and UE 116. In some embodiments, one or more of the gNBs 101-103 may be capable of communicating with each other and with the UEs 111-116 using 5G, long term evolution (LTE), LTE-A, WiMAX, or other advanced wireless communication technologies.

[0205] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with gNBs, such as coverage areas 120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0206] As described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook design and structure for a system with a 2D antenna array.

[0207] although Figure 1 One example of a wireless network 100 is shown, but Figure 1 Various changes may be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. Also, gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0208] Figure 2a and Figure 2b Example wireless transmit and receive paths according to the present disclosure are shown. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102) and receive path 250 can be described as being implemented in a UE (such as UE 116). However, it should be understood that receive path 250 can be implemented in a gNB and transmit path 200 can be implemented in a UE. In some embodiments, receive path 250 is configured to support codebook design and structure for a system with a 2D antenna array as described in embodiments of the present disclosure.

[0209] The transmit path 200 includes a channel coding and modulation block 205, a serial to parallel (S to P) block 210, an N-point inverse fast Fourier transform (IFFT) block 215, a parallel to serial (P to S) block 220, an add cyclic prefix block 225, and an upconverter (UC) 230. The receive path 250 includes a downconverter (DC) 255, a remove cyclic prefix block 260, a serial to parallel (S to P) block 265, an N-point fast Fourier transform (FFT) block 270, a parallel to serial (P to S) block 275, and a channel decoding and demodulation block 280.

[0210] In the transmit path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as low-density parity check (LDPC) coding), and modulates the input bits (such as using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulation symbols. The serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulation symbols into parallel data to generate N parallel symbol streams, where N is the number of IFFT / FFT points used in the gNB 102 and the UE 116. The N-point IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from the N-point IFFT block 215 to generate a serial time-domain signal. The add cyclic prefix block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the add cyclic prefix block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at baseband before conversion to RF frequency.

[0211] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through a wireless channel, and an operation opposite to that at gNB 102 is performed at UE 116. Downconverter 255 downconverts the received signal to a baseband frequency, and remove cyclic prefix block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 275 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0212] Each of gNBs 101-103 may implement a transmit path 200 similar to that for transmitting in the downlink to UEs 111-116 and may implement a receive path 250 similar to that for receiving in the uplink from UEs 111-116. Similarly, each of UEs 111-116 may implement a transmit path 200 for transmitting in the uplink to gNBs 101-103 and may implement a receive path 250 for receiving in the downlink from gNBs 101-103.

[0213] Figure 2a and Figure 2b Each of the components in can be implemented using hardware only, or a combination of hardware and software / firmware. As a specific example, Figure 2a and Figure 2bAt least some of the components in can be implemented with software, while other components can be implemented by configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 can be implemented as a configurable software algorithm, in which the value of the number of points N can be modified according to the implementation.

[0214] In addition, although described as using FFT and IFFT, this is illustrative only and should not be construed as limiting the scope of the present disclosure. Other types of transforms can be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N can be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N can be any integer as a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0215] although Figure 2a and Figure 2b An example of a wireless transmit and receive path is shown, but the Figure 2a and Figure 2b Make various changes. For example, Figure 2a and Figure 2b The various components in can be combined, further subdivided or omitted, and additional components can be added according to specific needs. Figure 2a and Figure 2b It is intended to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communications in a wireless network.

[0216] Figure 3a An example UE 116 according to the present disclosure is shown. Figure 3a The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111-115 can have the same or similar configurations. However, UEs have a variety of configurations, and Figure 3a The scope of the present disclosure is not limited to any particular implementation of the UE.

[0217] UE 116 includes antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuit 315, microphone 320, and receive (RX) processing circuit 325. UE 116 also includes speaker 330, processor / controller 340, input / output (I / O) interface (IF) 345, input device(s) 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0218] The RF transceiver 310 receives incoming RF signals from the antenna 305 transmitted by the gNB of the wireless network 100. The RF transceiver 310 downconverts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 sends the processed baseband signal to the speaker 330 (such as for voice data) or to the processor / controller 340 (such as for web browsing data) for further processing.

[0219] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or receives other outgoing baseband data (such as network data, email, or interactive video game data) from the processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0220] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0221] The processor / controller 340 is also capable of executing other processes and programs resident in the memory 360, such as operations for channel quality measurement and reporting for a system with a 2D antenna array as described in the embodiments of the present disclosure. The processor / controller 340 is capable of moving data into or out of the memory 360 as needed for the executed process. In some embodiments, the processor / controller 340 is configured to execute applications 362 based on the OS 361 or in response to signals received from the gNB or operator. The processor / controller 340 is also coupled to the I / O interface 345, where the I / O interface 345 provides the UE 116 with the ability to connect to other devices such as laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor / controller 340.

[0222] Processor / controller 340 is also coupled to input device(s) 350 and display 355. An operator of UE 116 can input data into UE 116 using input device(s) 350. Display 355 can be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). Memory 360 is coupled to processor / controller 340. A portion of memory 360 can include random access memory (RAM), while another portion of memory 360 can include flash memory or other read-only memory (ROM).

[0223] although Figure 3a An example of UE 116 is shown, but it is possible to Figure 3a Make various changes. For example, Figure 3a The various components in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. As a specific example, processor / controller 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although Figure 3a The UE 116 is shown configured as a mobile phone or smart phone, but the UE can be configured to operate as other types of mobile or stationary devices.

[0224] Figure 3b An example gNB 102 according to the present disclosure is shown. Figure 3b The embodiment of the gNB 102 shown in FIG. is for illustration only, and Figure 1 Other gNBs can have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 3b The scope of the present disclosure is not limited to any particular implementation of the gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structure as gNB 102.

[0225] like Figure 3b As shown in FIG. 1 , gNB 102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, transmit (TX) processing circuitry 374, and receive (RX) processing circuitry 376. In some embodiments, one or more of the multiple antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0226] The RF transceivers 372a-372n receive incoming RF signals from the antennas 370a-370n, such as signals transmitted by a UE or other gNB. The RF transceivers 372a-372n downconvert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to the RX processing circuitry 376, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuitry 376 sends the processed baseband signals to the controller / processor 378 for further processing.

[0227] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 378. The TX processing circuit 374 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers 372a-372n receive the outgoing processed baseband or IF signals from the TX processing circuit 374 and up-convert the baseband or IF signals to RF signals that are transmitted via the antennas 370a-370n.

[0228] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, the RX processing circuitry 376, and the TX processing circuitry 374 in accordance with well-known principles. The controller / processor 378 can also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process, such as performed through a Blind Interference Sensing (BIS) algorithm, and decode a received signal with an interference signal subtracted. The controller / processor 378 can support any of a variety of other functions in the gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0229] The controller / processor 378 can also execute programs and other processes resident in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller / processor 378 supports communications between entities such as web RTC. The controller / processor 378 can move data into or out of the memory 380 as needed by the executing process.

[0230] The controller / processor 378 is also coupled to a backhaul or network interface 382. The backhaul or network interface 382 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The backhaul or network interface 382 can support communication via any suitable (multiple) wired or wireless connections. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A), the backhaul or network interface 382 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow the gNB 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0231] The memory 380 is coupled to the controller / processor 378. A portion of the memory 380 can include RAM, while another portion of the memory 380 can include flash memory or other ROM. In some embodiments, a plurality of instructions such as a BIS algorithm are stored in the memory. The plurality of instructions are configured to cause the controller / processor 378 to perform the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0232] As described in more detail below, the transmit and receive paths of the gNB 102 (implemented using the RF transceivers 372a-372n, the TX processing circuitry 374, and / or the RX processing circuitry 376) support aggregated communications with FDD cells and TDD cells.

[0233] although Figure 3b An example of a gNB 102 is shown, but the Figure 3b For example, gNB 102 can include any number of Figure 3a . As a specific example, an access point can include a number of backhaul or network interfaces 382, ​​and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, while shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, the gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0234] In the above communication system, the communication interface between the network base station and the UE is called the UU interface. The UE performs data transmission and signaling interaction with the network through the UU interface. Two UEs with communication needs can access the same network through their respective UU interfaces and achieve communication based on data transfer within the network. In the bypass communication system, two UEs that are close to each other can communicate directly without the need for data transfer through the network base station. The wireless link between the two UEs is called a bypass (Sidelink, SL), and the communication interface between the two UEs is called a PC5 interface (direct communication interface).

[0235] The current bypass system mainly has the following physical channels / signals: Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Control Channel (PSCCH), Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Feedback Channel (PSFCH), and Sidelink Channel State Information Reference Signal (SL CSI-RS). Among them, PSBCH is used for synchronization and indicating important broadcast information; PSCCH is used to indicate the resource allocation and related information of PSSCH. In addition to indicating the resources of PSSCH in the same time slot, it can also indicate one or more subsequent resources for PSSCH transmission. In addition, it can also indicate whether PSSCH resources are reserved at intervals; PSSCH is used to transmit data, including MAC (Medium Access Control) PDU (Protocol Data Unit) and / or MAC CE (Control Element); PSFCH is used to indicate HARQ (Hybrid Automatic Repeat Request) feedback of PSSCH, for example, ACK (ACKnowledge Character) is fed back for successful decoding, and NACK (Negative ACKnowledgement) is fed back for unsuccessful decoding; SL CSI-RS is used for CSI (Channel State Information) measurement. The current bypass system only supports non-periodic and non-independent SL CSI-RS, that is, SL CSI-RS is always transmitted together with PSSCH, that is, it does not have the characteristics of independent transmission.

[0236] In the current bypass system, the bypass control information (Sidelink Control Infromation, SCI) used to indicate the PSSCH includes two stages, the first stage SCI and the second stage SCI. The UE with the purpose of resource sensing only needs to decode the first stage SCI, and does not need to decode the second stage SCI. The UE with the purpose of SCI monitoring needs to decode both the first stage SCI and the second stage SCI. The second stage SCI has a variety of SCI formats, and the first stage SCI indicates the format of the corresponding second stage SCI.

[0237] In the bypass communication system, three communication modes are supported, namely broadcast, multicast and unicast. Broadcast means that a UE sends data to all UEs around it, and all UEs need to receive the broadcast PSSCH; groupcast means that a UE sends data to a specific group of UEs around it, that is, only a specific UE group needs to receive the multicast PSSCH, and PSCCH indicates the target UE group ID (Identity document) that needs to receive the corresponding multicast PSSCH; unicast means that a UE sends data to a specific UE around it, that is, only a specific UE needs to receive the unicast PSSCH, and PSCCH indicates the target UE ID that needs to receive the corresponding unicast PSSCH. For unicast, a PC5 RRC (Radio Resource Control) connection will be established between the two UEs to control the underlying physical transmission.

[0238] Currently, bypass communication is only available in the FR1 band. Due to the severe shortage of spectrum resources in FR1, it is necessary to support bypass communication in the high-frequency FR2 band. The high-frequency carrier attenuates very severely in the wireless transmission environment, and narrow beam transmission is required to improve coverage. The main difference between FR2 communication and FR1 communication is that FR2 communication uses directional beams for transmission, that is, all channels / signals are transmitted in a specific beam direction. The purpose is to concentrate the transmission power in a certain direction to increase the signal power at the receiving end, thereby improving the coverage range.

[0239] In the FR2 scenario of bypass communication, the technical details of beam measurement and beam reporting are still unclear. The existing SL CSI-RS used for CSI measurement is not suitable for beam measurement. This is because the existing SL CSI-RS is always accompanied by PSSCH, and in fact, beam measurement has nothing to do with whether there is data transmission. If the SL CSI-RS used for beam measurement is always transmitted with PSSCH, it is bound to reduce resource utilization efficiency.

[0240] Based on this, the embodiment of the present application provides an independent SL CSI-RS, which is more suitable for beam measurement and reporting, and proposes relevant technical details for the independent SL CSI-RS used for beam measurement.

[0241] An embodiment of the present application provides a method performed by a first UE in a communication system, such as Figure 4a As shown, the method includes:

[0242] Step S101: Sending configuration information of an independent SL CSI-RS to a second UE;

[0243] Step S102: Determine resources for independent SL CSI-RS transmission;

[0244] Step S103: Sending an independent SL CSI-RS to the second UE on the determined resources;

[0245] Step S104: receiving a measurement report based on an independent SL CSI-RS from a second UE.

[0246] In an embodiment of the present application, a time unit may refer to any one of an aggregated time slot, a time slot, and a mini time slot, wherein an aggregated time slot corresponds to an aggregation of multiple consecutive time slots, a mini time slot corresponds to an OFDM symbol, or multiple consecutive OFDM symbols in a time slot, and a time slot may include multiple mini time slots.

[0247] In the embodiment of the present application, the UE that sends data is referred to as the first UE or UE1 or the sending UE (i.e., TransmissionUE, TX UE), and the UE that receives data is referred to as the second UE or UE2 or the receiving UE (i.e., Reception UE, RX UE). A PC5 RRC connection is established between the first UE and the second UE to support unicast transmission. The ID of the first UE is referred to as the first UE ID or source ID (Source ID), and the ID of the second UE is referred to as the second UE ID or target ID (Destination ID). The first UE sends PSCCH / PSSCH to the second UE, and the second UE feeds back PSFCH to the first UE.

[0248] For the embodiments of the present application, different SL CSI-RS resources can be associated with different transmit beams of the first UE (i.e., corresponding to different spatial domain transmit filters), the first UE uses different spatial domain transmit filters to send different SL CSI-RS resources, the second UE measures L1-RSRP (Layer 1-Reference Signal Receiving Power, reference receive power of layer 1) or L1-SINR (Layer 1-Signal to Interference plus Noise Ratio, signal to interference plus noise ratio of layer 1, SINR can be referred to as signal to interference and noise ratio) on different SL CSI-RS resources, and reports the measurement results to the first UE, the first UE manages the beam based on the beam measurement results reported by the second UE, for example, always determines the transmit beam with the best communication quality as the service beam, the first UE indicates the service beam to the second UE, and sends PSCCH and PSSCH based on the service beam, and the second UE uses the receive beam paired with the service beam to receive PSCCH and PSSCH.

[0249] The first UE can configure one or more SL CSI-RS resource sets for the second UE through PC5 RRC signaling, and one SLCSI-RS resource set can include multiple SL CSI-RS resources. In one example, the multiple SL CSI-RS resources included in the SL CSI-RS resource set can be located in different OFDM (Orthogonal Frequency Division Multiplexing) symbols in the same time slot, and these multiple SL CSI-RS resources can be associated with the same transmit beam, that is, the transmit beam is transmitted repeatedly (repetition), the purpose is to facilitate the second UE to use different receive beams to perform measurements on these multiple SLCSI-RS resources, that is, receive beam scanning, to assist the second UE to determine the corresponding optimal receive beam for each transmit beam of the first UE; in another example, the multiple SL CSI-RS resources included in the SL CSI-RS resource set can be located in different time slots, and these multiple SL CSI-RS resources can be associated with different transmit beams, that is, the transmit beam is transmitted by scanning (sweeping), so that the second UE can measure different transmit beams of the first UE.

[0250] In addition, the first UE can use a PC5 RRC parameter repetition to indicate whether the multiple SL CSI-RS resources included in the SL CSI-RS resource set are associated with different transmit beams. For example, if the parameter repetition is configured to "on", then the multiple SL CSI-RS resources included in the SL CSI-RS resource set are associated with the same transmit beam (i.e., the same spatial domain transmit filter is repeatedly used for transmission); if the parameter repetition is configured to "off", then the multiple SL CSI-RS resources included in the SL CSI-RS resource set are associated with different transmit beams (i.e., different spatial domain transmit filters are used for transmission).

[0251] In an embodiment of the present application, the mentioned transmit beam can be characterized by a sidelink transmission configuration indication (Sidelink Transmission Configuration Indicator, SL TCI) state ID, and the signal corresponding to the same SL TCI state ID can be understood as being sent by the TX UE from the same spatial domain transmit filter, and the RX UE can use the same spatial domain receive filter to receive, and the RX UE can determine the spatial domain receive filter to be used according to the TCI state ID of the PSSCH / PSCCH transmission indicated by the TX UE. For example, referring to the TCI framework used in the communication system of the UU interface, the SL TCI can indicate that the DMRS (Demodulation Reference Signal) of the PSSCH / PSCCH has a quasi-co-located (Quasi-CoLocated, QCL) characteristic with a reference bypass reference signal in terms of large-scale parameters. This reference bypass reference signal can be an SL SSB (Synchronization Signal Block) or an SL CSI-RS (Channel State Information-Reference Signal).

[0252] QCL means that the antenna ports of two quasi-co-located physical signals have the same large-scale parameters, that is, the large-scale parameters of the wireless channel experienced by PSSCH / PSCCH can be measured from the reference signal of its QCL. According to the different types of large-scale parameters, QCL can be divided into four types: Type A, Type B, Type C, and Type D. QCL Type A means that the two antenna ports have the same delay spread, Doppler spread, Doppler shift, and average delay. QCL Type B means that the two antenna ports have the same Doppler spread and Doppler shift. QCL Type C means that the two antenna ports have the same Doppler shift and average delay. QCL Type D means that the two antenna ports have the same spatial reception parameters. QCL Type A, Type B, and Type C can be used in all frequency bands, while QCL Type D is only used in FR2, which means that the signals of the two antenna ports are sent using the same beam (that is, sent using the same spatial domain transmit filter), and the receiving end can use the same receive beam to receive.

[0253] Each SL TCI state can indicate the index number of the associated reference bypass reference signal, such as the index number of SL SSB or SLCSI-RS, and indicate the QCL type associated with this reference bypass reference signal (indicating one from Type A, Type B, Type C, Type D); or, each SL TCI state can only indicate the index number of the associated reference bypass reference signal, such as the index number of SL SSB or SL CSI-RS, and the QCL relationship associated with this reference bypass reference signal defaults to Type D.

[0254] In addition to the SL TCI state, the transmit beam of the PSSCH / PSCCH transmission can also be characterized by the index number of the SL SSB or SL CSI-RS. For example, the DMRS of the PSCCH / PSSCH is indicated to be associated with a reference bypass reference signal, and the QCL relationship associated with the reference bypass reference signal defaults to Type D, where the reference bypass reference signal can be an SL SSB or SL CSI-RS.

[0255] In an embodiment of the present application, the first UE configures (indicates) the transmit beam information of PSSCH / PSCCH (e.g., SL TCI state ID, or the index number of the associated bypass reference signal) to the second UE so that the second UE uses the receive beam paired with the transmit beam to receive PSSCH / PSCCH.

[0256] In an embodiment of the present application, the transmit beam of PSSCH / PSCCH may be referred to as a service beam. The first UE indicates the service beam information to the second UE through PC5 RRC signaling, MAC CE and / or SCI. The service beam information may be an SL TCI state ID or an index number of an associated reference bypass reference signal. During the beam maintenance process, the first UE selects a transmit beam with the best communication quality from a plurality of transmit beams as a service beam based on the beam measurement information reported by the second UE. When the position of the first UE, the position of the second UE, and / or the wireless channel environment changes, the first UE may switch the service beam from one beam to another to keep the service beam always the beam with the best communication quality. Before switching the service beam, the first UE indicates the updated service beam information to the second UE.

[0257] In the embodiment of the present application, steps S101 to S104 may be regarded as the first UE performing beam maintenance for a PC5 RRC connection through an independent SL CSI-RS.

[0258] The independent SL CSI-RS can be understood as an independently transmitted SL CSI-RS, that is, the SL CSI-RS is not transmitted together with the PSSCH. For the convenience of description, unless otherwise indicated as a non-independent SL CSI-RS, all SL CSI-RSs hereinafter refer to independent SL CSI-RSs.

[0259] Specifically, in step S101, the first UE configures the configuration information of the independent SL CSI-RS for beam measurement to the second UE through PC5 RRC signaling, including but not limited to resource configuration information and measurement report configuration information. In step S102, the first UE determines the bypass resources for independent SL CSI-RS transmission; in step S103, the first UE sends the independent SL CSI-RS to the second UE on the determined bypass resources; further, the second UE receives the independent SL CSI-RS sent by the first UE to perform measurement, and reports the measurement result to the first UE; in step S104, the first UE receives the measurement report based on the independent SL CSI-RS from the second UE. In the embodiment of the present application, beam measurement and reporting based on independent SL-CSI-RS is adopted, and the measurement based on the SL-CSI-RS can be called beam measurement, and the measurement report based on the SL-CSI-RS can be called beam reporting or beam measurement reporting.

[0260] In the embodiment of the present application, the independent SL CSI-RS may have the following optional time slot structures:

[0261] In the first optional scheme, the independent SL CSI-RS has no accompanying SCI and PSSCH in the same slot. For example, the time and frequency resources of the SL CSI-RS are pre-configured to the second UE by the first UE through PC5 RRC signaling, or the time and frequency resources of the SL CSI-RS are indicated in advance by the previous SCI. Therefore, there is no need for an accompanying SCI to indicate the frequency domain resources of the SL CSI-RS in the same slot when the SL CSI-RS is transmitted.

[0262] Depending on whether there is an accompanying PSFCH, it can be divided into two time slot structures, namely Figure 5 and Figure 6 When SLCSI-RS is not accompanied by PSFCH, the time slot structure is as follows: Figure 5 As shown, in a time slot, except for the first symbol used as an automatic gain control (AGC) symbol and the last symbol used as a guard interval (GP) symbol, the other symbols are used for SL CSI-RS mapping. In addition, the SL CSI-RS signal on the second symbol can be repeatedly mapped to the first symbol (AGC symbol);

[0263] In the case where the SL CSI-RS has an accompanying PSFCH, that is, each SL CSI-RS transmission has a corresponding PSFCH transmission, the time slot structure is as follows Figure 6 As shown, the last few symbols of the time slot can be used for PFSCH transmission, because the SLCSI-RS and PSFCH in the same time slot can be sent by different UEs, GP and AGC symbols need to be reserved between the SL CSI-RS symbols and the PSFCH symbols, and the PSFCH symbols may not be available in every bypass time slot. Which bypass time slots have PSFCH symbols can be determined by the corresponding parameters configured in the resource pool. For each subchannel occupied by the SL CSI-RS, the corresponding PSFCH resource can be determined in the first time slot with a PSFCH symbol that meets the preset interval after the SL CSI-RS transmission.

[0264] In an embodiment of the present application, the accompanying PSFCH of the SL CSI-RS can be used to roughly feedback the measurement results of the SL CSI-RS. For example, if the layer 1 RSRP value or layer 1 SINR value of the SL CSI-RS measured by the second UE is greater than the first preset threshold value, then ACK is fed back on the PSFCH resources corresponding to the SL CSI-RS, otherwise, no information is fed back; or, if the layer 1 RSRP value or layer 1 SINR value of the SL CSI-RS measured by the second UE is greater than the second preset threshold value, then ACK is fed back on the PSFCH resources corresponding to the SL CSI-RS; if the layer 1 RSRP value or layer 1 SINR value of the SL CSI-RS measured by the second UE is less than the second preset threshold value and greater than the third preset threshold value, then NACK is fed back on the PSFCH resources corresponding to the SL CSI-RS, otherwise, no information is fed back.

[0265] In the second optional scheme, the SL CSI-RS has an associated SCI in the same time slot, that is, an accompanying SCI, but no accompanying PSSCH. The accompanying SCI can be used to indicate the frequency domain resources of the SL CSI-RS in the same time slot, and can also indicate that the resources are reserved according to the indicated period. The accompanying SCI can be used to indicate resource allocation information to the second UE, and for resource sensing of other UEs. In the embodiment of the present application, the accompanying SCI of the SL CSI-RS transmission refers to the associated SCI in the time slot where the SL CSI-RS transmission is located, and the accompanying SCI can also be called the associated SCI.

[0266] Similarly, depending on whether there is an accompanying PSFCH, it can be divided into two time slot structures, namely Figure 7 and Figure 8 As shown. Figure 7 and Figure 8 In a time slot, the first few symbols are PSCCH symbols corresponding to the SCI associated with the SL CSI-RS, followed by the SL CSI-RS symbol.

[0267] In the third optional scheme, the SL CSI-RS has an associated SCI and an associated SL MACCE (Sidelink Medium Access Control Control Element) in the same time slot, that is, an accompanying SCI and an accompanying SL MAC CE. The accompanying SCI can be used to indicate the frequency domain resources of the SL CSI-RS in the same time slot, and can also indicate that the resources are reserved according to the indicated period. The accompanying SL MAC CE is used to indicate related information such as SL CSI-RS resource configuration and / or measurement report configuration, wherein the accompanying SL MAC CE is carried by the PSSCH.

[0268] Similarly, depending on whether there is an accompanying PSFCH, it can be divided into two time slot structures, namely Fig. 9 and Fig.10 As shown. Fig. 9 and Fig.10 In a time slot, the first few symbols are PSCCH symbols corresponding to the SCI of the SL CSI-RS ( Fig. 9 and Fig.10 Take 2 as an example), followed by the PSSCH symbol corresponding to the SL MAC CE accompanying the SL CSI-RS ( Fig. 9 and Fig.10 Taking 3 as an example), followed by SL CSI-RS symbols; or, in a time slot, the first few symbols are PSCCH symbols corresponding to the accompanying SCI of SL CSI-RS, followed by a mixed mapping of SL CSI-RS and PSSCH, for example, SL CSI-RS is mapped to some REs (Resource Element) on some symbols of PSSCH resources.

[0269] In actual applications, the system may use one or more of the above optional schemes. For example, if the first UE is configured for Mode (Type) 1 resource allocation, the first UE may request periodic bypass resources from the base station for SL CSI-RS transmission, and the base station allocates time-frequency resources for the first UE to send SL CSI-RS. The first UE configures the SLCSI-RS transmission resources to the second UE through PC5 RRC signaling. In this case, the time-frequency resources of the SL CSI-RS are pre-configured and do not need to be indicated by the accompanying SCI. Therefore, the first optional scheme mentioned above may be used to map the resources corresponding to the accompanying SCI to the SLCSI-RS to improve resource utilization efficiency.

[0270] If the first UE is configured with Mode 2 resource allocation, it is difficult for the first UE to obtain periodic bypass resources for SLCSI-RS transmission. SL CSI-RS resources can be dynamically allocated on the resource pool based on resource sensing. In this case, the accompanying SCI can be used to indicate the time-frequency resources of the dynamically scheduled SL CSI-RS. Therefore, the second optional scheme and / or the third optional scheme can be used. For the third optional scheme, the accompanying SL MAC CE may not be present for each SLCSI-RS transmission, and the accompanying SCI may include a field for indicating whether there is an accompanying SL MAC CE, that is, the second optional scheme and the third optional scheme can be determined based on the indication of the accompanying SCI. From the perspective of unified system design, Mode 1 resource allocation can use the same time slot structure as the Mode 2 resource allocation mode.

[0271] In at least one of the above-mentioned time slot structures, if the SL CSI-RS and the accompanying SCI use different transmit beams (that is, use different spatial transmit filters), then an AGC symbol needs to be reserved between the SL CSI-RS and the PSCCH, and the SL CSI-RS signal on the first symbol after the AGC symbol is repeatedly mapped to the AGC symbol. All receiving UEs on the resource pool adjust the AGC on the AGC symbol. This is because the receiving power difference of signals sent by different transmit beams may be large, and the AGC level value used for the previous signal may not be suitable for the subsequent signal. The UE needs to readjust the AGC before receiving the subsequent signal.

[0272] Similarly, if the SL CSI-RS and the accompanying PSSCH (used to carry the accompanying SL MAC CE) use different transmit beams (that is, use different spatial transmit filters), then an AGC symbol needs to be reserved between the SL CSI-RS and the corresponding PSSCH, and the PSSCH signal on the first symbol after the AGC symbol is repeatedly mapped to the AGC symbol.

[0273] Similarly, if the accompanying SCI of the SL CSI-RS and the accompanying SL MAC CE use different transmit beams (that is, use different spatial transmit filters), then an AGC symbol needs to be reserved between the PSCCH and the PSSCH, and the PSSCH signal on the first symbol after the AGC symbol is repeatedly mapped to the AGC symbol.

[0274] For each of the above-mentioned AGC symbols, all receiving UEs on the resource pool adjust the AGC on the AGC symbol, so the reservation of AGC symbols will greatly reduce the resource utilization efficiency. Therefore, the most reasonable transmission scheme is that the SL CSI-RS and the accompanying SCI and / or the accompanying SL MAC CE use the same transmission beam.

[0275] Accordingly, multiple SL CSI-RS resources can be transmitted in one SL CSI-RS time slot. If these multiple SL CSI-RS resources use different transmit beams (i.e., use different spatial transmit filters), then an AGC symbol needs to be reserved between two adjacent SL CSI-RS resources, and the SL CSI-RS signal on the first symbol after the AGC symbol is repeatedly mapped to the AGC symbol. Fig.11As shown, all receiving UEs on the resource pool adjust the AGC on the AGC symbol. On the first UE side, the signal on each SL CSI-RS symbol can be repeatedly mapped on the AGC symbol before it. On the second UE side, before receiving each SL CSI-RS resource, the AGC is adjusted on the AGC symbol corresponding to it. This transmission scheme can be called intra-slot beam scanning, that is, the high-level parameter "repetition" of the SL CSI-RS resource set mentioned above is configured as "off". This transmission scheme can traverse all beams in a short time, greatly saving the time of beam measurement.

[0276] Alternatively, multiple SL CSIR-S resources within a SL CSI-RS time slot may also use the same transmit beam (i.e., use the same spatial transmit filter). This transmission scheme may be referred to as intra-time slot transmit beam repetition, and its purpose is to facilitate receive beam scanning on the second UE side, i.e., when the high-level parameter "repetition" of the SL CSI-RS resource set mentioned above is configured as "on", the second UE may use different receive beams to sequentially measure the reference signal from the same transmit beam, thereby determining the corresponding optimal receive beam for this transmit beam. The difference in receive power of signals received by different receive beams may be large, and the AGC level used by the previous receive beam may not be suitable for the next receive beam. After switching the receive beam, the second UE should use the switched receive beam to adjust the AGC before using the switched receive beam to receive the SL CSI-RS. Therefore, each SL CSI-RS resource occupies at least 2 symbols, such as Fig.12 As shown, for each SL CSI-RS resource, the second UE adjusts the AGC on the first symbol based on the implementation and receives the SL CSI-RS on the second symbol.

[0277] Fig.12 and Fig.11 The difference is that Fig.11 An AGC symbol is reserved between two adjacent SL CSI-RS resources in the resource pool. All receiving UEs on the resource pool need to adjust the AGC on the AGC symbol. Fig.12 In the embodiment, there is no need to reserve AGC symbols between two adjacent SL CSI-RS resources, and the corresponding UE receiving the SL CSI-RS can adjust the AGC based on the first symbol of each SL CSI-RS resource.

[0278] In practical applications, use Fig.12 still Fig.11 The time slot structure may depend on the configuration of the SL CSI-RS resource pool.

[0279] For example, if SL CSI-RS transmission is configured to share a resource pool with PSSCH transmission, that is, PSSCH transmission is allowed on the resource pool, then it is not suitable to use Fig.11 The time slot structure is because the AGC symbol is applicable to all receiving UEs on the resource pool, that is, it is applicable to all transmissions on the resource pool, whether it is SL CSI-RS transmission or PSSCH transmission. Introducing AGC symbols in the SLCSI-RS transmission time slot will greatly affect the resource utilization rate of PSSCH transmission, that is, the symbol in the PSSCH transmission time slot corresponding to the AGC symbol in the SL CSI-RS transmission time slot should also be set to the AGC symbol. Therefore, in this configuration, it can be set that there is no AGC symbol between the SL CSI-RS transmission and the physical bypass control channel PSCCH in the time unit where the SL CSI-RS transmission is located, such as using Fig.12 The time slot structure in the SL CSI-RS resource set, that is, the parameter "repetition" is configured as "off" by default.

[0280] For another example, if the SL CSI-RS transmission is configured with a dedicated resource pool, that is, no PSSCH transmission is allowed on the resource pool, then Fig.11 The AGC symbol in the PSSCH will not affect the PSSCH transmission, and the transmit beam scanning mode in the SL CSI-RS time slot can be applied. Optionally, the SL CSI-RS transmission on the resource pool can use transmit beam repetition or transmit beam scanning, that is, the parameter "repetition" of the SL CSI-RS resource set can be configured as "on" or "off". Considering the uniformity of the AGC symbol, an AGC symbol can be set to be reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located. The AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol, such as using Fig.11 The time slot structure in the resource pool; or optionally, the SL CSI-RS transmission on the resource pool uses either transmit beam repetition or transmit beam scanning. It can be set that if the dedicated resource pool is configured as the first mode, there is no AGC symbol between two adjacent SL CSI-RS resources in the time unit; if the dedicated resource pool is configured as the second mode, an AGC symbol is reserved between two adjacent SL CSI-RS resources in the time unit, and the AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol. That is, the parameter "repetition" of the SL CSI-RS resource set can be fixed to "on" or "off". For example, when the resource pool is configured to use the first mode, it can be used Fig.11When the time slot structure in , the parameter "repetition" of the SL CSI-RS resource set is configured as "off" by default. When the resource pool is configured to use the second mode, you can use Fig.12 When the time slot structure is in , the parameter "repetition" of the SL CSI-RS resource set is configured as "on" by default.

[0281] In the embodiment of the present application, Figure 4a Based on the above, a method performed by a first UE in a communication system is further provided, such as Figure 4b As shown, the method includes:

[0282] Step S201: Determine configuration parameters of a periodic SL CSI-RS window;

[0283] Step S202: determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within a periodic SL CSI-RS window;

[0284] Step S203: Sending a SL CSI-RS to a second UE on at least one resource;

[0285] Step S204: receiving a measurement report based on the SL CSI-RS from the second UE.

[0286] That is, in the embodiment of the present application, a periodic SL CSI-RS window is used to transmit the SL CSI-RS. Considering that beam measurement needs to be performed periodically to continuously track changes in beam quality, periodic or semi-continuous SLCSI-RS transmission is necessary. However, in bypass resource allocation mode 2 (Mode 2), the bypass resources used for bypass channel transmission are shared by multiple UEs through competition. It is very difficult for UEs to preempt periodic bypass resources. The preemption of periodic resources will also affect the resource allocation of other UEs. It is difficult for the first UE to ensure periodic transmission of SLCSI-RS on the same resource for a long time. To address this problem, an embodiment of the present application introduces the concept of a periodic window of SL CSI-RS, that is, the SL CSI-RS window appears periodically, and the transmission position of the SL CSI-RS within the window is uncertain, that is, the SL CSI-RS within the window can be transmitted based on dynamic scheduling. For example, the SL CSI-RS can be accompanied by SCI to indicate its scheduled resources. The first UE only needs to ensure that the SL CSI-RS is transmitted in one or more time slots within each SL CSI-RS window, and there is no need to ensure that the transmission position of the SL CSI-RS is periodic. In other words, transmitting the SL CSI-RS in a periodic SL CSI-RS window through dynamic scheduling can achieve an effect similar to that of periodic SL CSI-RS transmission. The advantage of this method is that it makes SL CSI-RS resource allocation based on the Mode 2 resource allocation scheme feasible.

[0287] Specifically, in step S201, the first UE determines the configuration parameters of the periodic SL CSI-RS window, including but not limited to at least one of the following: the period size of the SL CSI-RS window; the starting position of the SL CSI-RS window; the length of the SL CSI-RS window. Among them, the period size and starting position of the SL CSI-RS window can be determined by the same parameter. In step S202, the first UE determines the bypass resources for independent SL CSI-RS transmission within the SL CSI-RS window of each period; in step S203, the first UE sends an independent SL CSI-RS to the second UE on the bypass resources determined within the SL CSI-RS window of each period; further, the second UE listens to the independent SL CSI-RS sent by the first UE within the SL CSI-RS window of each period, and performs beam measurement based on the listened independent SL CSI-RS, and the second UE reports the measurement result to the first UE. In step S204, the first UE receives a measurement report based on the independent SL CSI-RS from the second UE.

[0288] In the embodiment of the present application, the periodic SL CSI-RS window can be as follows: Fig.13 As shown, the actual transmission position of the SL CSI-RS within the window is uncertain, and the resources of the SL CSI-RS transmission can be indicated by the associated SCI (such as the accompanying SCI). The first UE can send one or more SL CSI-RS resources within the SL CSI-RS window, or the first UE can send one or more SL CSI-RS resource sets within the SL CSI-RS window, and correspondingly, the first UE can send one or more SL CSI-RS transmissions within the SL CSI-RS window. That is, the configuration parameters of the periodic SL CSI-RS window also include but are not limited to at least one of the following: the index number of one or more SL CSI-RS resources transmitted within the SL CSI-RS window; the index number of one or more SL CSI-RS resource sets transmitted within the SL CSI-RS window.

[0289] In the embodiment of the present application, an optional implementation is provided for step S201, which may specifically include at least one of the following methods:

[0290] (1) Autonomous determination, i.e., the first UE autonomously determines the relevant parameter values ​​of the periodic SL CSI-RS window, and configures the relevant parameter values ​​of the periodic SL CSI-RS window to the second UE through PC5 RRC signaling;

[0291] (2) receiving configuration parameters of the periodic SL CSI-RS window from the base station, that is, the first UE receives relevant parameter values ​​of the periodic SL CSI-RS window configured by RRC signaling from the base station, and configures the received relevant parameter values ​​of the periodic SL CSI-RS window to the second UE through PC5 RRC signaling;

[0292] (3) pre-configured bypass parameters, i.e., the first UE obtains relevant parameter values ​​of the periodic SL CSI-RS window from the pre-configured high-layer bypass parameters, and configures the received relevant parameter values ​​of the periodic SL CSI-RS window to the second UE through PC5 RRC signaling;

[0293] (4) Receiving configuration parameters of the periodic SL CSI-RS window from the second UE, that is, the first UE receives relevant parameter values ​​of the periodic SL CSI-RS window configured by PC5 RRC signaling from the second UE, that is, the periodic SL CSI-RS window is configured by the second UE to the first UE, and the first UE sends an independent SL CSI-RS to the second UE within the periodic SL CSI-RS window configured by the second UE.

[0294] Among them, for the first three methods of determining the relevant parameters of the periodic SL CSI-RS window, the first UE sends PC5 RRC signaling to the second UE to indicate the configuration parameters of the periodic SL CSI-RS window; for the fourth method of determining the relevant parameters of the periodic SL CSI-RS window, the first UE receives PC5 RRC signaling from the second UE to indicate the configuration parameters of the periodic SLCSI-RS window.

[0295] In an optional implementation, at most one (i.e., one configured) periodic SL CSI-RS window can be configured. For example, the first UE configures a periodic SL CSI-RS window for the second UE through PC5 RRC signaling. In addition to configuring the period size, the starting position of the period, and the size of the window, the first UE also configures one or more SL CSI-RS resources (or resource sets) transmitted within the SL CSI-RS window for the second UE. The benefit of this implementation is that it saves the power consumption of the second UE monitoring the SL CSI-RS to the greatest extent. The first UE can implement SL CSI-RS transmission of different periods within a periodic SL CSI-RS window. For example, some SL CSI-RS can be transmitted in each SL CSI-RS window, while other SL CSI-RS can be transmitted in part of the SL CSI-RS window.

[0296] In another optional implementation, multiple (i.e., multiple configurations) periodic SL CSI-RS windows may be configured. For example, the first UE configures corresponding periodic SL CSI-RS windows for each SL CSI-RS resource set through PC5 RRC signaling. The periodic sizes of SL CSI-RS windows of different SL CSI-RS resource sets may be different. SL CSI-RS windows of different SL CSI-RS resource sets may not overlap, partially overlap, or completely overlap. The benefit of this implementation is that it provides sufficient flexibility for independent SL CSI-RS transmission.

[0297] In an embodiment of the present application, within a periodic SL CSI-RS window, not only is the transmission position of the SL CSI-RS uncertain, but the number of SL CSI-RS resources or resource sets actually transmitted is also uncertain. For example, the first UE may transmit one or more SL CSI-RS resources or resource sets within the window according to the actual channel conditions. When the change in the first UE position, the second UE position, and / or the channel environment is very small, the first UE may send fewer SL CSI-RS resources (corresponding to fewer transmit beams) within the window. Conversely, the first UE may send more SL CSI-RS resources (corresponding to more transmit beams) within the window. The maximum number of SL CSI-RS resources or resource sets that can be transmitted within the window may be preconfigured by the first UE to the second UE through PC5 RRC signaling. That is, the configuration parameters of the periodic SL CSI-RS window also include but are not limited to at least one of the following: the maximum number of SL CSI-RS resources allowed to be transmitted within the SL CSI-RS window; the maximum number of SL CSI-RS resource sets allowed to be transmitted within the SL CSI-RS window; the maximum number of SL CSI-RS time units allowed to be transmitted within the SL CSI-RS window (that is, the maximum number of SL CSI-RS transmissions allowed within the SL CSI-RS window).

[0298] Optionally, independent SL CSI-RS transmission includes multiple SL CSI-RS resources within one time unit, and each SL CSI-RS resource in the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0299] Optionally, the accompanying SCI of the SL CSI-RS may indicate whether the current transmission is the last SLCSI-RS transmission in the corresponding window. If it is the last SL CSI-RS transmission in the corresponding window, the second UE may stop monitoring the SLCSI-RS.

[0300] Optionally, the SCI accompanying the SL CSI-RS may also indicate the number of SLCSI-RS transmissions in the corresponding window for the current transmission, and the second UE may determine whether there is a missed SL CSI-RS based on this indication information. If there is a missed SLCSI-RS, the second UE may cancel reporting the beam measurement corresponding to the window.

[0301] In an embodiment of the present application, the first UE can configure a periodic SL CSI-RS window for the second UE through PC5 RRC signaling, but this configuration does not mean that the periodic SL CSI-RS window is effective. The first UE can also send a SLMAC CE to the second UE to activate or deactivate the periodic SL CSI-RS window. After the second UE receives the SL MAC CE for activation, the periodic SL CSI-RS window becomes effective.

[0302] Specifically, the first UE may send a PSSCH to the second UE, where the PSSCH carries the SL MAC CE for activating or deactivating the periodic SL CSI-RS window; receive a PSFCH from the second UE, where the PSFCH carries the confirmation ACK information corresponding to the PSSCH transmission; and use the first time unit or the first bypass time unit that meets the first preset interval after the time unit where the PSFCH transmission is located as the starting position of the SL CSI-RS window. That is, the starting position of the first SL CSI-RS window may be the position that meets the first preset interval after the ACK feedback corresponding to the SL MAC CE for activation, and the size of the first preset interval may be predefined. After the second UE receives the SL MAC CE for deactivation, the periodic SL CSI-RS window becomes invalid. This periodic SL CSI-RS window within a period of time may be called a semi-persistent SL CSI-RS window.

[0303] In an embodiment of the present application, the starting position of the periodic SL CSI-RS window can be determined by the first UE according to a predefined rule. For example, the starting position of the SL CSI-RS window is determined based on at least one of the following: the identity identification number ID of the first UE; the ID of the second UE. That is, the first UE can determine the starting position of the periodic SL CSI-RS window based on its own ID (Source ID) and / or the ID (Destination ID) of the second UE. The advantage of such a design is that the SL CSI-RS windows paired with different UEs can be staggered in time, that is, the probability of SL CSI-RS windows paired with different UEs overlapping in time is reduced, and the interference level of SL CSI-RS in the resource pool is reduced.

[0304] As an example, the subframe SL-CSI-RS-Window-StartOffest where the starting position of the SL CSI-RS window is located can be determined by the following formula:

[0305] SL-CSI-RS-Window-StartOffest=Destination Layer-2 ID modulo SL-CSI-RS-Window-Cycle; or,

[0306] SL-CSI-RS-Window-StartOffest=Source Layer-2 ID modulo SL-CSI-RS-Window-Cycle; or,

[0307] SL-CSI-RS-Window-StartOffest=(Destination Layer-2 ID+Source Layer-2ID)modulo SL-CSI-RS-Window-Cycle

[0308] As another example, the time slot SL-CSI-RS-Window-SlotOffest where the starting position of the SL CSI-RS window is located can be determined by the following formula:

[0309] SL-CSI-RS-Window-SlotOffest=Destination Layer-2 ID modulo the number of slots in one subframe; or,

[0310] SL-CSI-RS-Window-SlotOffest=Source Layer-2 ID modulo the number of slots in one subframe; or,

[0311] SL-CSI-RS-Window-SlotOffest=(Destination Layer-2 ID+Source Layer-2ID)modulo the number of slots in one subframe

[0312] In the above formulas, Destination Layer-2 ID refers to the layer 2 ID of the target UE in a PC5 RRC connection, Source Layer-2 ID refers to the layer 2 ID of the source UE in a PC5 RRC connection, SL-CSI-RS-Window-Cycle refers to the period size of the periodic SL CSI-RS window, the number of slots in one subframe refers to the number of time slots included in a subframe, and modulo refers to the modulo operation. When the first UE and the second UE are in the process of establishing a PC5 RRC connection, they will exchange their respective ID information, that is, the first UE and the second UE are both known to each other's ID information.

[0313] If the second UE is configured with a periodic SL CSI-RS window, and a subframe number satisfies [(DFN×10)+subframe number] modulo SL-CSI-RS-Window-Cycle=SL-CSI-RS-Window-StartOffest, then the second UE starts monitoring the SL CSI-RS in the SL-CSI-RS-Window-SlotOffest time slot of this subframe, that is, monitors the SCI that schedules the SL CSI-RS. DFN refers to the direct frame number (DFN) in the bypass communication system.

[0314] In an embodiment of the present application, the length of the SL CSI-RS window of all UEs on a resource pool may be the same, for example, the length of the SL CSI-RS window is a predefined value; or, the length of the SL CSI-RS window is based on the resource pool configuration, that is, the first UE cannot autonomously determine the length of the SL CSI-RS window.

[0315] As an example, the length of the SL CSI-RS window is related to the number of SL CSI-RS resources (or resource sets) that need to be transmitted within the window. Optionally, the length or minimum length of the SL CSI-RS window is determined based on at least one of the following: the number of SL CSI-RS resources configured to be transmitted within the SL CSI-RS window; the number of SL CSI-RS resource sets configured to be transmitted within the SL CSI-RS window; the number of SL CSI-RS time units configured to be transmitted within the SL CSI-RS window; the subcarrier spacing size.

[0316] For example, for Mode 2 resource allocation mode, in order to ensure that the first UE can seize sufficient resources for SL CSI-RS transmission in the SL CSI-RS window, the length of the SL CSI-RS window should be related to the number of SL CSI-RS time slots that need to be transmitted. For example, if the number of SL CSI-RS time slots that need to be transmitted is larger, the length of the SL CSI-RS window should be longer. The number of SL CSI-RS time slots that need to be transmitted within the SL CSI-RS window can be determined by the number of SL CSI-RS resources or resource sets that need to be transmitted within the SL CSI-RS window.

[0317] In one example, the relationship between the length of the SL CSI-RS window and the number of SLCSI-RS slots to be transmitted in the window may be defined by a table. As shown in Table 1, the length or minimum length of the SL CSI-RS window may be determined based on the number of SL CSI-RS slots to be transmitted in the window and the applied subcarrier spacing (SCS).

[0318]

[0319]

[0320] Table 1

[0321] In the embodiment of the present application, each periodic SL CSI-RS window corresponds to a measurement report, and the measurement report is carried by the SL MAC CE. That is, the second UE monitors the SL CSI-RS in the SL CSI-RS window, performs beam measurement on all SLCSI-RS resources monitored in the window, and reports the beam measurement result to the first UE through the SL MAC CE. For example, the second UE reports the best SL L1-RSRP value or the best SL L1-SINR value measured in all monitored SL CSI-RS resources, and the corresponding SL CSI-RS resource index number to the first UE; or, the second UE reports the best X SL L1-RSRP values ​​or the best X SL L1-SINR values ​​measured in all monitored SL CSI-RS resources, and their respective corresponding SL CSI-RS resource index numbers to the first UE, where X is a predefined or preconfigured value.

[0322] For the embodiment of the present application, in order to ensure the timeliness of the beam measurement, the second UE cannot report the beam measurement result later than the maximum delay (the first preset delay boundary). If the second UE fails to report the beam measurement within the first preset delay boundary, the beam measurement result may be discarded. The value of the first preset delay boundary for beam measurement reporting may be configured to the second UE by the first UE through PC5 RRC signaling. The measurement report corresponding to the SL CSI-RS window of each period is sent by the second UE within the first preset delay boundary after at least one of the following time units (that is, the position of the first preset delay boundary for determining the beam measurement report can be determined by one of the following):

[0323] (1) The starting position of the SL CSI-RS window, i.e., the second UE reports beam measurement through the SL MAC CE within the delay boundary after the starting position of the SL CSI-RS window;

[0324] (2) The end position of the SL CSI-RS window, i.e., the second UE reports beam measurement through the SL MAC CE within the delay boundary after the end position of the SL CSI-RS window;

[0325] (3) reporting beam measurement through SL MAC CE within the time unit of the first SL CSI-RS transmission in the SL CSI-RS window, such as within the delay boundary after the first SL CSI-RS transmission monitored by the second UE in the SL CSI-RS window;

[0326] (4) Report beam measurement through SL MAC CE within the time unit where the last SL CSI-RS transmission in the SL CSI-RS window is located, such as within the delay boundary after the last SL CSI-RS transmission monitored by the second UE in the SL CSI-RS window.

[0327] In the embodiment of the present application, the measurement report is the measurement result of the SL CSI-RS received by the second UE in the SL CSI-RS window. The SL CSI-RS reception of the second UE in the SL CSI-RS window should meet at least one of the following expectations:

[0328] (1) The second UE expects to receive at least one of at least one SL CSI-RS transmission, at least one SL CSI-RS resource, and at least one SL CSI-RS resource set within the SL CSI-RS window;

[0329] (2) the second UE expects to receive at least one of a first preset number of SL CSI-RS transmissions, a second preset number of SL CSI-RS resources, and a third preset number of SL CSI-RS resource sets within the SL CSI-RS window, wherein the size of the preset number (the first preset number, the second preset number, or the third preset number) may be predefined or preconfigured, and the preset number is smaller than the maximum number of SL CSI-RS time slots that can be transmitted within the window, that is, the preset number is smaller than the maximum number of SL CSI-RS transmissions allowed within the window;

[0330] (3) The second UE expects to receive at least one of all SL CSI-RS transmissions, all SL CSI-RS resources, and all SL CSI-RS resource sets within the SL CSI-RS window.

[0331] In the embodiment of the present application, if the SL CSI-RS reception of the second UE within the SL CSI-RS window does not meet expectations, the operations performed by the second UE (the MAC layer) include at least one of the following:

[0332] (1) The second UE does not trigger the measurement report corresponding to the SL CSI-RS window;

[0333] (2) The second UE triggers reporting of information of the NACK state. Specifically, the second UE may not trigger reporting of beam measurement corresponding to the SL CSI-RS window, but instead triggers information reporting to report to the first UE that no SL CSI-RS resource is monitored within the SL CSI-RS window. For example, the reported information may be the NACK state, and the information reporting may be carried by the SLMAC CE.

[0334] (3) The second UE triggers measurement reporting of the SL CSI-RS resources received in the SL CSI-RS window. Specifically, the corresponding beam measurement reporting may be triggered. The second UE reports beam measurement based on the monitored part of the SL CSI-RS resources, and reports the index number of each monitored SL CSI-RS resource and its corresponding SL L1-RSRP value or SL L1-SINR value to the first UE. The measurement reporting may be carried by the SL MAC CE.

[0335] (4) The second UE triggers reporting of information about the SL CSI-RS resource index number not received within the SL CSI-RS window, that is, the second UE reports the index number of the SL CSI-RS resource not monitored to the first UE. The information reporting may be carried by the SLMAC CE.

[0336] In an embodiment of the present application, an optional implementation is provided for step S202, which may specifically include: determining at least one resource for SL CSI-RS transmission based on a resource subset, wherein the resource subset is determined based on a resource selection window, and the resource selection window is a recent SL CSI-RS window. Further optionally, the resource selection window is a recent SL CSI-RS window after a preset time interval is satisfied.

[0337] To support independent SL CSI-RS transmission, the first UE needs to allocate resources for SL CSI-RS. Similar to the resource allocation of PSSCH, the resource allocation of SL CSI-RS can include two modes. In Mode 1 resource allocation mode, the base station allocates SL CSI-RS transmission resources to the first UE; in Mode 2 resource allocation mode, the first UE autonomously allocates resources for SL CSI-RS transmission based on sensing of the resource pool.

[0338] Specifically, determining at least one resource for SL CSI-RS transmission based on a resource subset may include: in the case of configured Mode 2 resource allocation, the high-level layer requests the physical layer to determine a resource subset for SL CSI-RS transmission, the physical layer determines all candidate resources within the most recent SL CSI-RS window after the request moment as an initial set of candidate resources, excludes candidate resources that meet preset conditions in the initial set based on sensing, and ensures that the number of remaining candidate resources is not less than a fourth preset number, determines the remaining set of candidate resources as a resource subset, reports the determined resource subset to the high-level layer, and the high-level layer selects at least one resource from the resource subset for SL CSI-RS transmission.

[0339] For the embodiment of the present application, the first UE is configured with Mode 2 resource allocation mode. When the MAC layer of the first UE requests the physical layer to determine a resource subset (or resource subgroup) for a SL CSI-RS transmission, the physical layer determines the SL CSI-RS window as a resource selection window (Resource Selection Window), that is, only the bypass resources within the SL CSI-RS window can be used as single-slot candidate resources for SL CSI-RS transmission. The information of the SL CSI-RS window can be indicated to the physical layer by the high layer of the first UE. The SL CSI-RS window is the same as the periodic SL CSI-RS window configured by the first UE for the second UE. Considering that the determination of the resource subset requires processing time, the MAC layer of the first UE should request the physical layer to determine the resource subset at a position that meets the fifth preset interval before the starting position of each SL CSI-RS window, that is, the resource allocation of the SL CSI-RS cannot be performed later than the position that meets the fifth preset interval before the starting position of the SL CSI-RS window, for example, as Fig.14 As shown, the size of the fifth preset interval (Gap) is a predefined value, for example, it can be an existing and T 3 .

[0340] In an embodiment of the present application, the first UE can also report the configuration parameters of the periodic SLCSI-RS window to the base station when configured with Mode 1 resource allocation, so that the base station can allocate periodic SL CSI-RS resources corresponding to the SL CSI-RS window to the first UE.

[0341] In the embodiment of the present application, the first UE may also trigger a Scheduling Request (SR) to request the base station for at least one resource for independent SL CSI-RS transmission when Mode 1 resource allocation is configured.

[0342] Furthermore, if the resources allocated by the base station for SL CSI-RS transmission are within the SL CSI-RS window, the bypass authorization corresponding to the resources is judged to be valid; if the resources allocated by the base station for SL CSI-RS transmission are outside the SL CSI-RS window, the bypass authorization corresponding to the resources is judged to be invalid.

[0343] Among them, in order to distinguish it from requesting PSSCH transmission resources, the SR configuration (i.e., PUCCH resources) used to request SL CSI-RS transmission resources can be dedicated, that is, the SR configuration (i.e., PUCCH resources) used to request SL CSI-RS transmission resources and the SR configuration (i.e., PUCCH resources) used to request PSSCH transmission resources are configured separately, and the priority of SR corresponds to the priority of independent SL CSI-RS transmission, and the priority of independent SL CSI-RS transmission is predefined.

[0344] In an embodiment of the present application, the step of the first UE triggering SR to request the base station for at least one resource for independent SL CSI-RS transmission may specifically include: triggering SR to request the base station for resources for independent SL CSI-RS transmission at a position that satisfies the second preset interval before the SL CSI-RS window of each period. That is, the position that triggers SR may be a position that satisfies the second preset interval before the SLCSI-RS window, and the size of the second preset interval may be predefined.

[0345] In a bypass system, the UE can be configured with SL DRX to save power consumption, that is, the UE only monitors SCI during the SL DRX activation time, and does not need to monitor SCI during the SL DRX inactive time, thereby saving power consumption. Independent SL CSI-RS transmission may change the SL DRX activation time range.

[0346] For the embodiment of the present application, if the second UE is configured with SL DRX, and if the second UE is configured with the above-mentioned periodic SL CSI-RS window, the second UE should maintain the SL DRX activation state within the SL CSI-RS window to monitor the SCI of the SLCSI-RS. That is, the independent SL CSI-RS is received by the second UE within the second SL DRX activation time, and the second SL DRX activation time includes at least one of the following time periods:

[0347] (1) if the fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window is not received, the time period corresponding to the SL CSI-RS window;

[0348] If the fifth preset number of SL CSI-RSs in the SL CSI-RS window has not been monitored, a period of time in the SL CSI-RS window should be included in the activation time of SL DRX. In other words, the second UE continues to monitor the SL CSI-RS in the SL CSI-RS window.

[0349] (2) if a fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window are received, the time period from the start position of the SL CSI-RS window to the time unit at which the fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window are received;

[0350] If the fifth preset number of SL CSI-RS in the SL CSI-RS window are all monitored, the period between the start position of the SL CSI-RS window and the last SL CSI-RS transmission monitored should be included in the activation time of SL DRX. In other words, after monitoring the fifth preset number of SL CSI-RS, the second UE stops monitoring the SL CSI-RS sent by the first UE.

[0351] In the above two descriptions, the fifth preset number of SL CSI-RS can be preconfigured by the first UE to the second UE through PC5 RRC signaling, for example, the relevant parameter configuration information of the periodic SL CSI-RS window includes the maximum number of SL CSI-RS resources or resource sets allowed to be transmitted within the window, and the relevant parameter configuration information of the periodic SL CSI-RS window includes the maximum number of SL CSI-RS transmissions allowed within the window. Alternatively, the fifth preset number can be implicitly indicated by the first UE to the second UE through the associated SCI (accompanying SCI) of the SL CSI-RS.

[0352] (3) The time period from the start position of the SL CSI-RS window to the time when the last SL CSI-RS transmission within the SL CSI-RS window is received, wherein the SCI associated with the SL CSI-RS transmission indicates whether the SL CSI-RS transmission is the last SL CSI-RS transmission within the SL CSI-RS window.

[0353] As an example, the associated SCI (accompanying SCI) of the SL CSI-RS may include a field for indicating whether the current SL CSI-RS transmission is the last SL CSI-RS in the corresponding window. If the indication is the last SL CSI-RS transmission, the second UE should stop monitoring the SL CSI-RS sent by the first UE; otherwise, the second UE continues to monitor the SL CSI-RS sent by the first UE.

[0354] In an embodiment of the present application, if the first UE is configured with SL DRX, after the first UE sends a SL CSI-RS request beam measurement to the second UE, the first UE expects to receive the beam measurement report of the second UE within the maximum delay of the beam measurement report (the third preset delay boundary), then the first UE should keep the SL DRX activated to receive the beam measurement report of the second UE.

[0355] Specifically, the measurement report of the second UE is carried by the SL MAC CE, and step S204 may specifically include: monitoring the measurement report based on the independent SL CSI-RS within the first SL DRX activation time.

[0356] Specifically, the SCI sent by the second UE can be monitored within the first SL DRX activation time, and the PSSCH scheduled by the SCI carries the measurement report; and the measurement report is received based on the SCI.

[0357] The first SL DRX activation time includes at least one of the following time periods:

[0358] (1) if the measurement report is not received, the time period corresponding to the third preset delay boundary window of the measurement report;

[0359] That is, if the beam measurement report of the SL CSI-RS has not been received, then a period of time within the third preset delay boundary of the corresponding beam measurement report (i.e., the reporting window of the beam measurement) should be included in the activation time of the SL DRX. In other words, the first UE continues to listen to the beam measurement report from the second UE within the third preset delay boundary of the beam measurement report.

[0360] (2) If the measurement report is received, the time period from the start position of the third preset delay boundary window of the measurement report to the time when the measurement report is received.

[0361] If the beam measurement report of the SL CSI-RS is received, the period of time between the sending of the beam measurement report request (which can determine the starting position of the third preset delay boundary window of the measurement report) and the beam measurement report should be included in the activation time of the SL DRX. In other words, after receiving the beam measurement report, the first UE stops listening to the beam measurement report from the second UE.

[0362] In the above two descriptions, the length of the beam measurement reporting window (the third preset delay boundary window) (i.e., the third preset delay boundary) is configured by the first UE to the second UE through PC5 RRC signaling, and the starting position of the beam measurement reporting window is related to the beam measurement request transmission. For example, in one example, the first UE requests beam measurement reporting through SCI, and the starting position of the beam measurement reporting window is the moment when the beam measurement request is transmitted; in another example, the first UE requests beam measurement reporting through MAC CE, and the starting position of the beam measurement reporting window is the sixth preset interval position after the ACK feedback corresponding to the beam measurement request transmission, and the size of the sixth preset interval is predefined.

[0363] In an embodiment of the present application, the SL CSI-RS and its accompanying SCI use the same transmit beam (i.e., use the same spatial domain transmit filter), which can avoid introducing AGC symbols between the SL CSI-RS and the PSCCH. In addition, multiple SL CSI-RS resources in the same time slot should also use the same transmit beam (i.e., use the same spatial domain transmit filter) to avoid introducing AGC symbols between two adjacent SL CSI-RS resources, thereby improving resource utilization. This is especially important for the situation where SL CSI-RS and PSSCH share a resource pool, because the AGC symbol will greatly affect the transmission efficiency of PSSCH.

[0364] Based on this, in the embodiment of the present application, Figure 4a Based on the above, another method performed by a first UE in a communication system is further provided, such as Figure 4c As shown, the method includes:

[0365] Step S301: sending a first SCI and a SL CSI-RS cluster scheduled by the first SCI to a second UE, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster;

[0366] Step S302: receiving a measurement report based on the SL CSI-RS cluster from the second UE, wherein the measurement report is a measurement result of the second UE on multiple SL CSI-RSs on the indicated transmission resources.

[0367] An SL CSI-RS resource set may include multiple SL CSI-RS resources, and all SL CSI-RS resources included in the SL CSI-RS resource set have the same frequency domain density, the same antenna port, the same mapping pattern, the same transmission period, and / or the same size of frequency domain resources. In an example, all SL CSI-RS resources in an SL CSI-RS resource set may be mapped to be transmitted in the same time slot, for example, each SL CSI-RS resource occupies two consecutive symbols, that is, one SL CSI-RS resource set corresponds to one SL CSI-RS time slot (that is, one SL CSI-RS transmission), in which case, the SL CSI-RS cluster corresponds to multiple SL CSI-RS resource sets.

[0368] In another example, all SL CSI-RS resources within a SL CSI-RS resource set can be mapped to be transmitted in multiple (for example, two or three) consecutive or discrete time slots, and the resources of these multiple SL CSI-RS transmissions can be indicated by the same SCI (first SCI). In this case, the SL CSI-RS cluster corresponds to an SL CSI-RS resource set, and each SL CSI-RS transmission (time slot) in the SL CSI-RS cluster corresponds to an SL CSI-RS resource in the resource set. This SLCSI-RS resource is repeatedly mapped on multiple OFDM symbols in a time slot.

[0369] In other words, the SL CSI-RS cluster includes multiple SL CSI-RS transmissions, the multiple SL CSI-RS transmissions may be continuous or discontinuous in time, and the first SCI indicates transmission resources for the multiple SL CSI-RS transmissions respectively. Optionally, the SL CSI-RS transmission includes multiple SL CSI-RS resources in one time unit, and each of the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0370] For the embodiments of the present application, for the convenience of description, multiple SL CSI-RS transmissions scheduled by the same SCI (first SCI) are referred to as a SL CSI-RS cluster. In addition, multiple SL CSI-RS transmissions scheduled by the same SCI (first SCI) can also be referred to as a group of SL CSI-RS transmissions, a SL CSI-RS burst or a SL CSI-RS transmission set, etc.

[0371] In the embodiment of the present application, the solution can be Fig.15To indicate, SCI (i.e., the first SCI) can indicate the transmission resources of the SL CSI-RS cluster, each SL CSI-RS transmission in the SL CSI-RS cluster can use a different transmit beam (i.e., a different spatial domain transmit filter), the first SL CSI-RS transmission in the SL CSI-RS cluster can be in the same time slot as the first SCI, the first SL CSI-RS transmission can use the same transmit beam as the first SCI, and both correspond to the service beam, other SL CSI-RS transmissions can use the same transmit beam as the accompanying SCI (i.e., the second SCI), and can correspond to non-service beams. If the second UE monitors the SCI (i.e., the first SCI) that schedules the SL CSI-RS cluster, the second UE receives all SL CSI-RS transmissions of the SL CSI-RS cluster to perform beam measurement without decoding the accompanying SCI (i.e., the second SCI) of other SL CSI-RS transmissions in the SL CSI-RS cluster except for the first SLCSI-RS transmission. That is, regardless of whether the second UE decodes the second SCI or whether the decoding is successful, the second UE can receive the SL CSI-RS transmission on the time slot where the second SCI is located to perform beam measurement.

[0372] In an embodiment of the present application, an independent SL CSI-RS for beam measurement is transmitted in a cluster-based manner. An SL CSI-RS cluster includes multiple SL CSI-RS transmissions. The time-frequency resources used for the multiple SL CSI-RS transmissions are indicated by the same SCI (first SCI). For example, the first SL CSI-RS transmission in the SL CSI-RS cluster is sent in the same time unit as the first SCI, that is, the accompanying SCI of the first SL CSI-RS transmission in the SL CSI-RS cluster is used to indicate the resources of all SL CSI-RS transmissions in the cluster. The first SL CSI-RS transmission should be transmitted using a serving beam, and other SL CSI-RS transmissions can be transmitted through non-serving beams, specifically including the following process:

[0373] In step S301, the first UE uses the service beam to send an SL CSI-RS transmission and its accompanying SCI (first SCI) to the second UE. In addition to indicating the current SL CSI-RS transmission resources, the accompanying SCI also indicates the resources of multiple other SL CSI-RS transmissions. The first UE can use a non-service beam to send multiple other SL CSI-RS transmissions; further, the second UE receives the accompanying SCI (first SCI) of the SL CSI-RS transmission of the corresponding service beam sent by the first UE, and receives the SL CSI-RS on the multiple resources indicated by the first SCI to perform beam measurement; the second UE reports the beam measurement results to the first UE.

[0374] Assuming that one SL CSI-RS transmission (time slot) corresponds to one transmit beam, the SL CSI-RS used for beam measurement should be transmitted in multiple time slots using a transmit beam scanning method, that is, the first UE uses different transmit beams in turn to transmit the SL CSI-RS in multiple time slots. If the transmit beam used by an SL CSI-RS transmission and its accompanying SCI is not a service beam, then the second UE may not be able to successfully monitor the corresponding accompanying SCI, that is, it cannot determine the transmission resources of the SL CSI-RS by successfully decoding the accompanying SCI. Therefore, the transmission resources of the SL CSI-RS corresponding to the non-service beam need to be indicated in advance through the SCI, and the SCI (first SCI) is transmitted through the service beam to ensure that it can be successfully monitored by the second UE. In other words, the first UE preferentially transmits the SL CSI-RS corresponding to the service beam, and indicates the resources of the other multiple SL CSI-RS transmissions through its accompanying SCI (first SCI).

[0375] In an embodiment of the present application, after the time unit where the first SCI is located, a second SCI is also sent within the time unit where each SLCSI-RS transmission in the SL CSI-RS cluster is located, that is, each SL CSI-RS transmission in the SL CSI-RS cluster has a corresponding accompanying SCI, except for the first SL CSI-RS transmission in the SL CSI-RS cluster, the accompanying SCI (second SCI) of other SL CSI-RS transmissions is mainly used for resource perception of other UEs, that is, to inform other UEs to avoid the SL CSI-RS resources reserved for the next period, and the second SCI is not related to SL CSI-RS reception. The second SCI can only indicate the resource information of the SL CSI-RS transmission without indicating other information of the SL CSI-RS transmission, and the second UE does not need to decode the second SCI.

[0376] Optionally, the second SCI is at least used to indicate the resources of the SL CSI-RS transmission within the time unit where the second SCI is located. For example, for a SL CSI-RS cluster, the accompanying SCI of the first SL CSI-RS transmission needs to indicate the transmission resources of the entire SL CSI-RS cluster, and the accompanying SCI of other SL CSI-RS transmissions may only indicate the transmission resources of the SL CSI-RS in the time slot.

[0377] Or optionally, the accompanying SCI of other SL CSI-RS transmissions also indicates the transmission resources of the entire SL CSI-RS cluster, that is, the second SCI is used to indicate the resources of each SL CSI-RS transmission in the SL CSI-RS cluster. For the embodiments of the present application, the information content contained in the first SCI and the second SCI may be the same. That is, each SL CSI-RS transmission in the SL CSI-RS cluster has an accompanying SCI, and each SL CSI-RS transmission uses the same transmission beam as its corresponding accompanying SCI, and the accompanying SCI of each SL CSI-RS transmission may have exactly the same indication information, that is, they all indicate the transmission resources of the entire SL CSI-RS cluster. For example, assuming that the SL CSI-RS cluster includes N SL CSI-RS transmissions, the accompanying SCI of the first SL CSI-RS transmission (assuming it is the first SCI) indicates not only the resources of the current transmission, but also the following N-1 transmission resources, the accompanying SCI of the second SL CSI-RS transmission (which may be the second SCI) indicates not only the resources of the current transmission, but also the previous 1 transmission resource and the following N-2 transmission resources, the accompanying SCI of the third SL CSI-RS transmission (which may be the second SCI) indicates not only the resources of the current transmission, but also the previous 2 transmission resources and the following N-3 transmission resources, and so on. The advantage of this design is that the SL CSI-RS transmission corresponding to each transmit beam can indicate resource reservation to other UEs through the accompanying SCI for resource sensing of other UEs, so that other UEs can avoid these reserved resources to reduce the interference level on the resource pool.

[0378] Alternatively, the second SCI is used to indicate the resources of each SL CSI-RS transmission after the second SCI in the SL CSI-RS cluster. For example, for a SL CSI-RS cluster, the accompanying SCI of each SL CSI-RS transmission indicates not only the resources of the SL CSI-RS transmission in the time slot, but also the resources of other SL CSI-RS transmissions after the time slot.

[0379] Optionally, the scheduling SCI (first SCI) used for scheduling the SL CSI-RS cluster includes the first stage SCI and the second stage SCI, while the accompanying SCI (second SCI) of the SL CSI-RS transmission after the time slot where the first SCI is located in the SL CSI-RS cluster only includes the first stage SCI and does not include the second stage SCI. This is because the first stage SCI is used for resource sensing of other UEs, and the second stage SCI is used to indicate information related to scheduling transmission and not related to resource sensing. For SL CSI-RS cluster transmission, since the second stage SCI of the first SCI has indicated the relevant information of SL CSI-RS transmission, the second SCI does not need to include the second stage SCI, and the second SCI only includes the first stage SCI for resource sensing of other UEs. Among them, the information content contained in the first stage SCI of the first SCI and the first stage SCI of the second SCI can be exactly the same.

[0380] Optionally, since the second UE can obtain the transmission resources of the entire SL CSI-RS cluster by decoding the scheduling SCI (i.e., the first SCI) of the SL CSI-RS cluster, the second UE does not need to decode the accompanying SCI (i.e., the second SCI) of the SL CSI-RS cluster after the time slot where the first SCI is located, that is, the second SCI is not expected to be decoded by the second UE. Moreover, the second UE can infer the information bit content of the second SCI based on the decoding of the first SCI. Therefore, the second UE can perform measurements on the second SCI as a known signal sequence, and use the second SCI to assist the second UE in measuring the SL CSI-RS transmission associated with the second SCI. For example, the second UE locally regenerates the second SCI signal based on the information bit content of the second SCI, and measures the received second SCI signal based on the locally generated second SCI signal. The second SCI and the SL CSI-RS in the same time slot can use the same transmit power by default, that is, use the same energy power per resource particle (Eneregy Power Per Element, EPRE), or the second SCI and the SL CSI-RS in the same time slot use different transmit powers, but the power difference between the two can be indicated to the second UE by the first UE. Since the second SCI and the SLCSI-RS transmission in the same time slot correspond to the same transmit beam, the second UE can combine the measurement results of the second SCI and the measurement results of the SL CSI-RS as the result of beam measurement, that is, the second SCI is used to assist SL CSI-RS measurement.

[0381] Or optionally, after the time unit where the first SCI is located, the second SCI is not sent in the time unit where each SL CSI-RS transmission in the SL CSI-RS cluster is located, and the symbol corresponding to the SCI in the time unit where each SL CSI-RS transmission in the SL CSI-RS cluster is located is a repetition of the SL CSI-RS signal on part of the symbols in the time unit. That is, only the first SL CSI-RS transmission in the SL CSI-RS cluster has a corresponding accompanying SCI, and other SL CSI-RS transmissions do not have an accompanying SCI, because the resources of these SL CSI-RS transmissions have been indicated by the accompanying SCI of the first SL CSI-RS transmission, and their corresponding accompanying SCIs can be saved, and the corresponding accompanying SCI resources can be used for SL CSI-RS mapping, that is, the first SL CSI-RS transmission in the SL CSI-RS cluster uses such Figure 7 to Figure 10 At least one slot structure is shown, while other SL CSI-RS transmissions use Figure 5 or Figure 6 The time slot structure shown can repeatedly map the SL CSI-RS signals on some symbols (such as the first few symbols or the last few symbols) in the SL CSI-RS time slot on the symbols corresponding to the accompanying SCI. The benefit of this design is to improve the resource utilization efficiency.

[0382] In other embodiments, the first SL CSI-RS transmission in the SL CSI-RS cluster and the first SCI may not be in the same time unit. For example, the first SL CSI-RS transmission in the SL CSI-RS cluster is sent after the time unit where the first SCI is located. The first UE can send a PSSCH in the time unit where the first SCI is located. The PSSCH can be used to carry the accompanying SL MAC CE of the SL CSI-RS cluster. As described below, the accompanying SL MAC CE of the SL CSI-RS cluster can be used to indicate relevant information of the SL CSI-RS cluster, such as Fig.16 shown.

[0383] In the embodiment of the present application, the first SCI indicates the size of the frequency domain resources occupied by the SL CSI-RS transmission, and the frequency domain resource size is applicable to each SL CSI-RS transmission in the SL CSI-RS cluster, that is, multiple SL CSI-RS transmissions in the SL CSI-RS cluster use the same size of frequency domain resources. For example, each SL CSI-RS transmission occupies the same number of consecutive subchannels, so when the accompanying SCI indicates the frequency domain resource allocation (Frequency resource assignment) of the transmission resources of multiple SL CSI-RSs, it can indicate the starting subchannel position of each SL CSI-RS transmission and the number of subchannels occupied by these SL CSI-RS transmissions.

[0384] In an embodiment of the present application, in addition to indicating the time-frequency resources of the SL CSI-RS cluster, the accompanying SCI (first SCI) of the first SL CSI-RS transmission of the SL CSI-RS cluster can also be used to indicate that the resources are reserved according to a preset period and the corresponding preset period; for example, the "Resource Reservation Period" field in the SCI indicates the reservation period of the transmission resources of the current SL CSI-RS cluster, that is, the same frequency domain resources are reserved for the transmission of the SLCSI-RS cluster in the next period. Whether the first SCI includes the "Resource Reservation Period" can be configured through high-level parameters. The reservation period of the SL CSI-RS transmission resources and the reservation period of the PSSCH transmission resources can have different candidate values. For example, multiple reservation period values ​​dedicated to the SL CSI-RS transmission are pre-configured, and the first SCI indicates one of them. In addition, the first SCI may also include a 1-bit field to indicate whether the transmission resources of the SL CSI-RS cluster are reserved on a periodic basis. If the indication value is "1", the reserved resources for the next period are valid; if the indication value is "0", the reserved resources for the next period are invalid.

[0385] In one example, if the second UE successfully decodes the scheduling SCI (first SCI) of the current SL CSI-RS cluster, and the first SCI SCI indicates that the transmission resources are reserved on a periodic basis, then the second UE monitors the SCI on the resources reserved for the next period. If the second UE does not successfully decode the scheduling SCI of the SL CSI-RS cluster of the next period, then there is no need to perform beam measurement on the SL CSI-RS cluster of the next period. In other words, the resource reservation indicated in the SCI is only used for UE sensing, and does not mean that the reserved resources of the next period must be used for SL CSI-RS transmission.

[0386] In another example, if the second UE successfully decodes the scheduling SCI (first SCI) of the current SL CSI-RS cluster, and the first SCI indicates that the transmission resources are reserved on a periodic basis, then the second UE receives the SLCSI-RS on the resources reserved for the next period to perform beam measurement, regardless of whether the second UE successfully decodes the scheduling SCI (first SCI) of the SL CSI-RS cluster of the next period. In other words, as long as the current first SCI is successfully decoded, it is considered that there is SLCSI-RS transmission on the reserved resources of the next period. Similarly, the above-mentioned second SCI can also be used to indicate that resources are reserved according to a preset period and the corresponding preset period. For details, please refer to the introduction of the first SCI, which will not be repeated here.

[0387] In the embodiment of the present application, one SL CSI-RS cluster corresponds to one measurement report. Specifically, after monitoring the first SCI that schedules the SL CSI-RS cluster, the second UE performs beam measurement on the SL CSI-RS cluster and reports the beam measurement result to the first UE.

[0388] Optionally, the measurement report corresponding to the SL CSI-RS cluster is sent by the second UE within a second preset delay boundary after at least one of the following time units:

[0389] (1) The time unit in which the first SCI is transmitted, such as the second UE reporting the beam measurement result through the MAC CE within the reporting delay boundary after the first SCI is transmitted;

[0390] (2) The time unit in which the first SL CSI-RS in the SL CSI-RS cluster is transmitted, such as the second UE reporting the beam measurement result through the MAC CE within the reporting delay boundary after the first SL CSI-RS in the SL CSI-RS cluster is transmitted;

[0391] (3) The time unit where the last SL CSI-RS transmission in the SL CSI-RS cluster is located, such as the second UE reporting the beam measurement result through MAC CE within the reporting delay boundary after the last SL CSI-RS transmission in the SL CSI-RS cluster.

[0392] That is, the second UE should report the beam measurement result no later than the preconfigured reporting delay boundary (i.e., the second preset delay boundary, also referred to as the latest reporting delay). If the measurement result is not reported within the reporting delay boundary, it can be directly discarded. The value of the second preset delay boundary can be configured by the first UE to the second UE through PC5 RRC signaling.

[0393] In an embodiment of the present application, the number or maximum number of SL CSI-RS transmissions that can be scheduled by the first SCI is configurable, that is, the number or maximum number of SL CSI-RS transmissions included in the SL CSI-RS cluster is configurable, and the number or maximum number of schedulable SL CSI-RS transmissions can be indicated in the configuration information of the resource pool. For example, the number or maximum number of SLCSI-RS transmissions included in the SL CSI-RS cluster can be configured to 2, 3 or 4. Based on this configuration, the number of bits in the indication field of the frequency domain resource allocation and time domain resource allocation of the SLCSI-RS cluster in the first SCI can be determined. The actual number of SL CSI-RS transmissions scheduled by the first SCI can be less than or equal to the preconfigured maximum number, that is, the actual number of SL CSI-RS transmissions included in the SL CSI-RS cluster can be less than or equal to the preconfigured maximum number. For example, assuming that the number of preconfigured SL CSI-RS transmissions is 4, the number of SL CSI-RS transmissions that can actually be scheduled can be 1, 2, 3 or 4.

[0394] In an embodiment of the present application, the first UE may send the SL CSI-RS only after confirming that the second UE has successfully decoded the scheduling SCI (first SCI) of the SL CSI-RS cluster. Therefore, the first SCI transmission needs to have corresponding HARQ-ACK feedback. For example, if the second UE successfully decodes the scheduling SCI of the SL CSI-RS cluster, then it feeds back ACK through PSFCH, and the first UE receives the ACK information sent by the second UE on the PSFCH resources corresponding to the first SCI; otherwise, the second UE does not feed back anything. Similar to the association between PSSCH resources and PSFCH resources, the resources used for SL CSI-RS transmission can also be associated with PSFCH resources, and the second UE feeds back ACK on the PSFCH resources corresponding to the SL CSI-RS.

[0395] In addition, considering the delay of HARQ feedback transmission, the interval between the SL CSI-RS transmission after the first SCI and the first SCI transmission should be greater than the preset interval, so that the first UE transmits the SL CSI-RS only after receiving the ACK from the second UE. For example, the interval between the time unit where the first SCI is located and the time unit where the first SL CSI-RS transmission after the time unit where the first SCI is located is greater than or equal to the third preset interval. Assuming that the first SL CSI-RS transmission in the SL CSI-RS cluster is located in the same time unit as the first SCI, then the time interval between the second SL CSI-RS transmission in the SL CSI-RS cluster and the first SLCSI-RS transmission should satisfy the minimum preset interval (third preset interval), or, the interval between the time unit where the PSFCH corresponding to the first SCI is located and the time unit where the first SL CSI-RS transmission after the time unit where the first SCI is located is greater than or equal to the fourth preset interval. Assuming that the first SL CSI-RS transmission in the SL CSI-RS cluster is located in the same time unit as the first SCI, then the time interval between the second SL CSI-RS transmission in the SL CSI-RS cluster and the PSFCH corresponding to the first SL CSI-RS transmission should satisfy the minimum preset interval (fourth preset interval), and the minimum preset interval can be a predefined number of time slots.

[0396] In an embodiment of the present application, step S301 may also include: in the time unit where the first SCI is located, sending a PSSCH transmission indicated by the first SCI to the second UE; wherein the PSSCH may not include a MAC SDU, and only carry a SL MAC CE, and the SL MACCE is used to indicate relevant information of the SL CSI-RS cluster, and the SL MAC CE may be called a companion SL MACCE of the SL CSI-RS cluster.

[0397] In one example, in the time slot where the first SCI is located, in addition to the first SL CSI-RS transmission in the SL CSI-RS cluster, there is also a PSSCH for carrying the accompanying SL MAC CE, while other SL CSI-RS transmissions of the SL CSI-RS cluster have only the accompanying SCI (the second SCI) in the same time slot, without the accompanying SL MAC CE, that is, the first SL CSI-RS transmission in the SL CSI-RS cluster uses the following: Fig. 9 or Fig.10 The slot structure shown in FIG. 1 is used for the other SL CSI-RS transmissions. Figure 7 or Figure 8 The time slot structure is shown.

[0398] In another example, in the time slot where the first SCI is located, there is also a PSSCH for carrying the accompanying SL MAC CE, but does not include SL CSI-RS transmission, that is, the first SL CSI-RS transmission of the SL CSI-RS cluster is after the first SCI, for example Fig.16 shown.

[0399] The accompanying SL MAC CE of the SL CSI-RS cluster may be used to indicate at least one of the following related information of the SL CSI-RS cluster:

[0400] (1) Measurement and reporting related information corresponding to the SL CSI-RS cluster;

[0401] Specifically, it may include but is not limited to at least one of the following:

[0402] 1. Information indicating that the type of measurement indicator reported is at least one of RSRP (Reference Signal Receiving Power), SINR (Signal to Interference plus Noise Ratio) and CSI;

[0403] That is, the SL MAC CE indicates the type of measurement indicator reported. For example, the SL MAC CE may indicate that the measurement indicator reported is one or more of SL L1-RSRP, SL L1-SINR, and SL CQI.

[0404] 2. Information used to indicate the number of SL CSI-RS resources reporting the corresponding best measurement indicator.

[0405] For example, the second UE may report Z best measurement indicator values ​​among all measured SL CSI-RS resources and their corresponding SL CSI-RS resource index numbers, where the value of Z is indicated by the SL MAC CE.

[0406] Optionally, the SL MAC CE indicates one of multiple measurement reporting configurations. For example, the first UE configures multiple measurement reports for the second UE through PC5 RRC signaling. Each measurement reporting configuration includes relevant information of the measurement report. For example, each measurement reporting configuration may include information for indicating that the reported measurement indicator is one or more of SL L1-RSRP, SL L1-SINR, and SL CQI, and / or each measurement reporting configuration includes information for indicating the number of SLCSI-RS resources corresponding to the best measurement indicator reported.

[0407] (2) index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the transmission configuration indication TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0408] That is, the SL MAC CE indicates the corresponding index number of the SL CSI-RS resource set transmitted for each SL CSI-RS in the SL CSI-RS cluster, and / or indicates the corresponding TCI state ID for at least one SL CSI-RS resource included in the SL CSI-RS resource set.

[0409] (3) the index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0410] That is, the SL MAC CE indicates the corresponding index number for the SL CSI-RS resource set corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster, and / or indicates the corresponding TCI state ID for at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0411] (4) Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0412] That is, the SL MAC CE indicates the corresponding index number and / or TCI state ID for at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster.

[0413] (5) index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster;

[0414] That is, the SL MAC CE indicates the corresponding index number and / or TCI state ID for at least one SL CSI-RS resource included in each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster.

[0415] (6) At least one UE ID

[0416] That is, the SL MAC CE indicates the ID of one or more UEs that need to perform beam measurement and reporting, that is, the SL CSI-RS can be measured by multiple second UEs. If the second UE detects its own UE ID in the accompanying SL MAC CE of the SL CSI-RS cluster, it is necessary to perform beam measurement and reporting on this SL CSI-RS cluster;

[0417] Optionally, the SL MAC CE indicates the IDs of one or more UEs that need to perform beam measurement reporting, and indicates measurement-related configuration information for each UE.

[0418] In an embodiment of the present application, the TCI state corresponding to the first SCI transmission is pre-indicated by the first UE to the second UE, that is, the PSCCH used to carry the first SCI is sent using the spatial domain transmission filter corresponding to the service beam, and the TCI state corresponding to the service beam is pre-indicated by the first UE to the second UE.

[0419] Alternatively, in the embodiment of the present application, the first SCI may also be used to indicate relevant information of the SL CSI-RS cluster. Similarly, the first SCI may be used to indicate at least one of the following information (i.e., relevant information of the SL CSI-RS cluster):

[0420] (1) Measurement and reporting related information corresponding to the SL CSI-RS cluster;

[0421] Specifically, it may include but is not limited to at least one of the following:

[0422] 1. Information used to indicate that the type of measurement indicator reported is at least one of RSRP, SINR and CSI;

[0423] That is, the first SCI indicates that the measurement indicator reported is one or more of SL L1-RSRP, SL L1-SINR, and SL CQI.

[0424] 2. Information used to indicate the number of SL CSI-RS resources reporting the corresponding best measurement indicator.

[0425] For example, the second UE may report the M best measurement indicator values ​​among all measured SL CSI-RS resources and their corresponding SL CSI-RS resource index numbers, that is, the value of the first SCI indication M.

[0426] Optionally, the first SCI indicates one of multiple measurement reporting configurations. For example, the first UE configures multiple measurement reports for the second UE through PC5 RRC signaling. Each measurement reporting configuration includes relevant information of the measurement report. For example, each measurement reporting configuration may include information for indicating that the reported measurement indicator is one or more of SL L1-RSRP, SL L1-SINR, SL CQI, and / or each measurement reporting configuration includes information for indicating the number of SL CSI-RS resources corresponding to the best measurement indicator reported.

[0427] (2) the index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0428] That is, the first SCI indicates the corresponding index number for the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or indicates the corresponding TCI state ID for at least one SL CSI-RS resource included in the SL CSI-RS resource set.

[0429] (3) Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0430] That is, the first SCI indicates the corresponding index number and / or TCI state ID for at least one SL CSI-RS resource included in each SL CSI-RS transmission within the SL CSI-RS cluster.

[0431] In an embodiment of the present application, the index number information of the SL CSI-RS resource set is indicated by a bitmap; or, the index number information of at least one SL CSI-RS resource is indicated by a bitmap.

[0432] Taking the example that the index number information of at least one SL CSI-RS resource is indicated by a bitmap, the accompanying SL MAC CE or scheduling SCI of the SL CSI-RS cluster contains a field that indicates the index number of the SL CSI-RS resource transmitted within the SL CSI-RS cluster by means of a bit map. For example, the UE can be pre-configured with up to M SL CSI-RS resources, and the bit map includes M bits. In the order of the SL CSI-RS resource index number from small to large, each bit corresponds to a pre-configured SL CSI-RS resource index number. If the indication value is "1", it means that the SL CSI-RS resource with the corresponding index number is scheduled (transmitted). If the indication value is "0", it means that the SL CSI-RS with the corresponding index number is not scheduled (transmitted).

[0433] In an example, one SL CSI-RS transmission corresponds to one SL CSI-RS resource. Assuming that the maximum number of schedulable SL CSI-RS transmissions in the SL CSI-RS cluster is preconfigured to S, then 1 to S bits can be indicated as "1" in the bit map, and the first bit with an indication value of "1" corresponds to the first SL CSI-RS transmission of the SL CSI-RS cluster, the second bit with an indication value of "1" corresponds to the second SL CSI-RS transmission of the SL CSI-RS cluster, and so on. That is, the kth bit with an indication value of "1" corresponds to the kth SL CSI-RS transmission of the SL CSI-RS cluster, where 1≤k≤S.

[0434] In another example, one SL CSI-RS transmission corresponds to P SL CSI-RS resources. Assuming that the number of schedulable SL CSI-RS transmissions in the SL CSI-RS cluster is preconfigured to S, then P to P*S bits in the bit map may be indicated as "1", and the first bit with an indication value of "1" corresponds to the first SL CSI-RS resource in the first SL CSI-RS transmission of the SL CSI-RS cluster, the second bit with an indication value of "1" corresponds to the second SL CSI-RS resource in the first SL CSI-RS transmission of the SL CSI-RS cluster, the Pth bit with an indication value of "1" corresponds to the Pth SL CSI-RS resource in the first SL CSI-RS transmission of the SL CSI-RS cluster, and so on. That is, the P*(k-1)+jth bit with an indication value of "1" corresponds to the jth SL CSI-RS resource in the kth SL CSI-RS transmission of the SLCSI-RS cluster, where 1≤k≤S, 1≤j≤P.

[0435] In the embodiment of the present application, if the independent SL CSI-RS transmission and the PSSCH transmission are configured to use different resource pools, that is, the independent SL CSI-RS transmission uses a dedicated resource pool, then the accompanying SCI of the independent SL CSI-RS and the accompanying SCI of the PSSCH do not need to be distinguished; if the SL CSI-RS transmission and the PSSCH transmission are configured to share the same resource pool, the first SCI for scheduling the independent SL CSI-RS or the SL CSI-RS cluster and the third SCI for scheduling the PSSCH include at least one of the following situations:

[0436] (1) The first field in the first SCI and the first field in the third SCI for scheduling PSSCH are used to indicate the SCI format for scheduling SL CSI-RS clusters or the SCI format for scheduling PSSCH;

[0437] Optionally, the smaller one of the first SCI and the third SCI is padded with zeros until the payload sizes of the two are equal. The SCI after payload alignment includes a 1-bit field indicating whether the SCI is in the SCI format for scheduling SL CSI-RS or the format for scheduling PSSCH. If it indicates scheduling independent SL CSI-RS transmission, the remaining indication field is interpreted according to the accompanying SCI (first SCI) format of SL CSI-RS. If it indicates scheduling PSSCH transmission, the remaining indication field is interpreted according to the accompanying SCI (third SCI) format of PSSCH.

[0438] (2) The first SCI and the third SCI use different DMRS sequences;

[0439] That is, the DMRS sequence implicitly indicates the type of SCI.

[0440] (3) The first SCI and the third SCI use the same first-stage SCI format but different second-stage SCI formats;

[0441] That is, the first SCI and the third SCI both include the first stage SCI and the second stage SCI, the PSSCH transmission and the SL CSI-RS transmission have the same first stage SCI format, the first stage SCI indicates the format of the second stage SCI, and the PSSCH transmission and the SL CSI-RS transmission use different second stage SCI formats.

[0442] In the embodiment of the present application, the SCI used to indicate the SL CSI-RS cluster resource is not the accompanying SCI (first SCI) of the SL CSI-RS, but the accompanying SCI (third SCI) of the PSSCH. Fig.16As shown, the SL CSI-RS cluster is scheduled by the accompanying SCI of the PSSCH. For example, the accompanying SCI of the PSSCH indicates not only the frequency domain resources of the PSSCH in the same time slot, but also the time-frequency resources of the following three SL CSI-RS transmissions. Here, the PSSCH may not carry a MAC SDU (Service Data Unit) but only a SL MAC CE. As described above, the SL MAC CE may be used to indicate the relevant information of the SL CSI-RS resource configuration and measurement report. In one example, each SL CSI-RS transmission of the SL CSI-RS cluster is accompanied by an SCI, and the SCI is used to indicate the transmission resources of the SL CSI-RS in the time slot, or the SCI is used to indicate the transmission resources of the entire SL CSI-RS cluster. In another example, each SL CSI-RS transmission of the SL CSI-RS is not accompanied by an SCI, and the SL CSI-RS signal on some symbols of the SL CSI-RS transmission (such as the first few symbols or the last few symbols) may be repeatedly mapped on the symbols corresponding to the accompanying SCI, that is, the following may be used. Figure 5 or Figure 6 The time slot structure is shown.

[0443] From the above introduction, it can be seen that in order to support independent SL CSI-RS transmission, the first UE needs to allocate resources for SL CSI-RS. Similar to the resource allocation of PSSCH, the resource allocation of SL CSI-RS can include two modes. In Mode 1 resource allocation mode, the base station allocates SL CSI-RS transmission resources to the first UE; in Mode 2 resource allocation mode, the first UE autonomously allocates resources for SL CSI-RS transmission based on sensing of the resource pool.

[0444] In Mode 1 resource allocation mode, the base station can allocate periodic SL CSI-RS resources to the first UE. For example, the base station can configure periodic SL CSI-RS resources for the first UE through RRC signaling; or, the base station can allocate semi-persistent SL CSI-RS resources to the first UE, such as the base station can activate or deactivate the semi-persistent SL CSI-RS resources through DCI (Downlink Control Information), and activate the transmission resources indicating the SL CSI-RS in the DCI; or, the base station schedules non-periodic SL CSI-RS resources for the first UE through DCI signaling.

[0445] As introduced above, the SL CSI-RS cluster can be the basic form of independent SL CSI-RS transmission. Correspondingly, the base station can configure the resources of the periodic SL CSI-RS cluster for the first UE through RRC signaling, or activate or deactivate the resources of the semi-continuous SL CSI-RS cluster through DCI, or schedule the resources of the non-periodic SL CSI-RS cluster through DCI.

[0446] Among them, one SL CSI-RS cluster resource includes multiple continuous or discrete SL CSI-RS transmissions. For semi-continuous SL CSI-RS cluster transmissions and non-periodic SL CSI-RS cluster transmissions, the DCI can indicate the resources of multiple continuous or discrete SL CSI-RS transmissions. Here, due to the convenience of the base station controlling resources, multiple SL CSI-RS transmissions of an SL CSI-RS cluster can occupy the same frequency domain resources, that is, have the same starting subchannel and the same number of subchannels, thereby saving the signaling overhead of resource indication. Therefore, the accompanying SCI (first SCI) of the SL CSI-RS can have two formats, corresponding to Mode 1 and Mode 2 resource allocation schemes, respectively.

[0447] Optionally, if a resource pool of the UE is configured as Mode 1 resource allocation mode, then the accompanying SCI of the SL CSI-RS monitored or sent by the UE on this resource pool uses a first SCI format, wherein the accompanying SCI only indicates one frequency domain resource allocation, that is, if Mode 1 resource allocation is configured, the first SCI indicates the frequency domain position of the SL CSI-RS transmission, wherein the frequency domain position applies to each SL CSI-RS transmission in the SL CSI-RS cluster, that is, the frequency domain resources of all SLCSI-RS transmissions in the SL CSI-RS cluster are exactly the same; if a resource pool of the UE is configured as Mode 2 resource allocation mode, then the accompanying SCI of the SL CSI-RS monitored or sent by the UE on this resource pool uses a second format, wherein the accompanying SCI indicates the respective frequency domain resource positions for each SL CSI-RS cluster in the SLCSI-RS cluster, that is, if Mode 2 resource allocation is configured, the first SCI respectively indicates the starting frequency domain position of each SL CSI-RS transmission in the SL CSI-RS cluster, that is, different SLs in the SL CSI-RS cluster are The frequency domain resource positions of CSI-RS transmissions may be different, but the sizes of frequency domain resources occupied by different SL CSI-RS transmissions may be the same.

[0448] In the case of configured Mode 1 resource allocation, for non-periodic SL CSI-RS transmission, the first UE can trigger SR to request resources for SL CSI-RS cluster transmission from the base station, and receive DCI from the base station, where DCI is used to indicate resources for SL CSI-RS cluster transmission, i.e., one DCI can indicate resources for multiple SL CSI-RS transmissions. That is, the first UE can request transmission resources for the SL CSI-RS cluster from the base station through SR. In order to distinguish it from requesting transmission resources for PSSCH, the SR configuration (i.e., PUCCH resources) for requesting transmission resources for the SL CSI-RS cluster can be dedicated, i.e., the SR configuration for requesting transmission resources for the SL CSI-RS cluster and the SR configuration for requesting transmission resources for PSSCH are configured separately, and the priority of the SL CSI-RS corresponds to the priority of this SR configuration.

[0449] In Mode 2 resource allocation mode, the first UE autonomously allocates resources for SL CSI-RS transmission in the resource pool through sensing. The resource allocation process for SL CSI-RS transmission can refer to the existing PSSCH resource allocation process. The MAC layer of the first UE requests the physical layer to determine a resource subset for SL CSI-RS transmission. The physical layer reports the determined resource subset to the MAC layer, and the MAC layer selects one or more resources for SL CSI-RS transmission. Fig.17 As shown in FIG. 1 , the Mode 2 resource allocation process performed by the physical layer in time slot n can be simply described as the following steps:

[0450] Step 1: Determine a resource selection window, determine each time slot or part of a time slot belonging to the bypass resource pool in the resource selection window as a candidate time slot, and determine a plurality of preset number of continuous sub-channels corresponding to the bypass resource pool on the candidate time slot as candidate single time slot resources R x,y , the total number of candidate single-slot resources can be recorded as M total In one example, as described above, the first SL CSI-RS transmission window after time n is determined as the resource selection window; in another example, the resource selection window is [n+T 1 ,n+T 2 ], where T 1 and T 2 and are predefined values.

[0451] Step 2: Determine the resource sensing window The UE performs sensing on each time slot or part of the time slots belonging to the bypass resource pool within the resource sensing window. The so-called sensing on the time slots means that the UE decodes the first-stage SCI and performs measurements on these time slots. For example, if the first-stage SCI schedules PSSCH, the UE measures RSRP based on the DMRS of PSCCH and / or PSSCH. If the first-stage SCI schedules independent SL CSI-RS transmission, the UE measures RSRP based on the DMRS and / or SL CSI-RS of PSCCH. The UE will exclude candidate resources that meet the preset conditions from the candidate resources based on the sensing results, thereby determining the candidate resource subset. Among them, T 0 and These are predefined values.

[0452] Step 3: Set the initial RSRP threshold Th(p i ,p j ), the RSRP threshold is used to determine whether candidate resources are excluded, Th(p i ,p j ) is the indication value of the i-th field of the pre-configured parameter sl-Thres-RSRP-List, where i=p i +(p j -1)*8.

[0453] Step 4: Set S A Initialized to all candidate single-slot resources R x,y .

[0454] Step 5: UE selects from the set S A Exclude the candidate single-slot resources R that meet the following conditions x,y :

[0455] -Time slots where the UE does not perform sensing in step 2

[0456] - For each reservation interval value allowed by the higher-level parameter sl-ResourceReservePeriodList, in this time slot A hypothetical SCI is received, the "Resource reservation period" field of the SCI is indicated as the period value, the SCI indicates that all subchannels belonging to the bypass resource pool in this time slot are reserved, and the condition c in step 6 is satisfied. In other words, if the UE should perform sensing in a time slot but does not perform it, and if the reserved time slot corresponding to each reservation interval of this time slot overlaps with the reserved time slot corresponding to the candidate resource, then the candidate single-slot resource R x,y Should be excluded.

[0457] Step 5a: If S in the set A The number of remaining candidate single-slot resources is less than the preset threshold (X*M total ), X is the pre-configured ratio, then S is set as in step 4 A Initialized to all candidate single-slot resources.

[0458] Step 6: UE selects from the set S A Exclude the candidate single-slot resources R that meet the following conditions x,y :

[0459] -Condition a: UE is in the time slot Receive an SCI, in which the "Resource reservation period" and "Priority" fields indicate P rsvp_RX and prio RX The value of .

[0460] - Condition b: The RSRP value measured based on the received SCI is higher than the threshold value Th(prio RX ,prio TX ). Among them, prio TX is the priority value of SL CSI-RS transmission, prio RX The priority value indicated in the SCI, the priority value of the SL CSI-RS transmission may be a predefined or preconfigured value.

[0461] -Condition c: In the time slot The received SCI includes the "Resource reservation period" field, that is, the resources indicated by this SCI are reserved periodically. A reserved resource corresponding to this SCI overlaps with a reserved resource corresponding to a candidate resource, that is, the SCI is in the time slot The reserved resources on the same node as the reserved resources corresponding to the candidate resources There is overlap, where q = 1, 2, ..., Q, j = 0, 1, ..., C resel -1, in other words, the resources reserved by other UEs according to the periodicity collide with the candidate resources or the reserved resources corresponding to the candidate resources, P′ rsvp_RX Based on P rsvp_RX The number of converted logical time slots, P′ svp_TX Based on P rsvp_TX The number of converted logical time slots, P rsvp_TX is the resource reservation interval indicated by the high-level layer for this resource allocation. The conversion formula is: T′ maxIt is the total number of time slots within 10240 ms excluding reserved time slots, non-bypass resource pool time slots, and SL-SSB time slots.

[0462] Combined with conditions a to c, the exclusion condition can be simply summarized as follows: if the periodic reserved resources indicated by other UEs through SCI collide with the candidate single-slot resources, or the periodic reserved resources indicated by other UEs through SCI collide with the periodic reserved resources corresponding to the candidate single-slot resources, and the RSRP measured based on the SCI is higher than the preset threshold value, then the candidate single-slot resource R x,y Should be excluded.

[0463] Step 7: If the set S A The number of remaining candidate single time slot resources is less than the preset threshold value (X·M total ), then the RSRP threshold value Th(p i ,p j ) are increased by a preset amount, for example by 3dB, and return to step 4 to continue the process.

[0464] In the above resource allocation process, the parameters used to determine the resource subset for SL CSI-RS transmission may be different from the parameters used to determine the resource subset for PSSCH transmission. For example, at least one of the following parameters may be configured for SL CSI-RS transmission and PSSCH transmission respectively:

[0465] (1) Periodic reservation interval of resources;

[0466] (2) the minimum ratio of the number of single-slot candidate resources included in the resource subset to the initial number of single-slot candidate resources, that is, the value of X in the above resource allocation process;

[0467] (3) an initial RSRP threshold value used to exclude single-slot candidate resources;

[0468] (4) An adjustment amount for adjusting the RSRP threshold value;

[0469] In an optional implementation, the MAC layer of the first UE requests the physical layer to determine a resource subset for SL CSI-RS transmission in a transmit beam direction, and the MAC layer selects a resource from the resource subset for the SL CSI-RS transmission corresponding to the specified transmit beam, which cannot be used for other SL CSI-RS transmissions. The MAC layer indicates the transmit beam information corresponding to the SL CSI-RS transmission to the physical layer, and the transmit beam information may be at least one of a TCI state ID, a spatial transmit filter, or an SL CSI-RS resource index number. In other words, the UE can determine the SLCSI-RS resources for different transmit beam transmissions at different time points, with the advantage of having sufficient flexibility.

[0470] In another optional implementation, the MAC layer of the first UE requests the physical layer to determine a resource subset for each SL CSI-RS transmission in a SL CSI-RS cluster, that is, the number of resource subsets is the number of SLCSI-RS transmissions (time slots) contained in the SL CSI-RS cluster, each resource subset corresponds to a transmit beam, and the MAC layer selects a resource from each resource subset for the SL CSI-RS transmission of the corresponding transmit beam.

[0471] In an optional solution, the first UE is configured with Mode 2 resource allocation mode. When the MAC layer of the first UE requests the physical layer to determine a resource subset for a SL CSI-RS transmission or a SL CSI-RS cluster, the physical layer determines the SL CSI-RS window in the above text as the resource selection window, that is, only the bypass resources within the SL CSI-RS window can be used as single-slot candidate resources for SL CSI-RS transmission. The method for determining the information of the SL CSI-RS window can refer to the introduction above and will not be repeated here.

[0472] Similarly, if the first UE is configured with SL DRX, after the first UE sends the first SCI and the SL CSI-RS cluster scheduled by the first SCI to the second UE requesting beam measurement, the first UE expects to receive the beam measurement report of the second UE within the maximum delay of the beam measurement report (the third preset delay boundary), then the first UE should keep the SL DRX activated to receive the beam measurement report of the second UE.

[0473] Specifically, the measurement report of the second UE is carried by the SL MAC CE, and step S302 may specifically include: monitoring the measurement report based on the SL CSI-RS cluster within the first SL DRX activation time.

[0474] Specifically, the SCI sent by the second UE can be monitored within the first SL DRX activation time, and the PSSCH scheduled by the SCI carries the measurement report; and the measurement report is received based on the SCI.

[0475] The first SL DRX activation time includes at least one of the following time periods:

[0476] (1) if the measurement report is not received, the time period corresponding to the third preset delay boundary window of the measurement report;

[0477] That is, if the beam measurement report of the SL CSI-RS has not been received, then a period of time within the third preset delay boundary of the corresponding beam measurement report (i.e., the reporting window of the beam measurement) should be included in the activation time of the SL DRX. In other words, the first UE continues to listen to the beam measurement report from the second UE within the third preset delay boundary of the beam measurement report.

[0478] (2) If the measurement report is received, the time period from the start position of the third preset delay boundary window of the measurement report to the time period when the measurement report is received.

[0479] If the beam measurement report of the SL CSI-RS is received, the period of time between the sending of the beam measurement report request (which can determine the starting position of the third preset delay boundary window of the measurement report) and the beam measurement report should be included in the activation time of the SL DRX. In other words, after receiving the beam measurement report, the first UE stops listening to the beam measurement report from the second UE.

[0480] In the above two descriptions, the length of the beam measurement reporting window (the third preset delay boundary window) (i.e., the third preset delay boundary) is configured by the first UE to the second UE through PC5 RRC signaling, and the starting position of the beam measurement reporting window is related to the beam measurement request transmission. For example, in one example, the first UE requests beam measurement reporting through SCI, and the starting position of the beam measurement reporting window is the moment when the beam measurement request is transmitted; in another example, the first UE requests beam measurement reporting through MAC CE, and the starting position of the beam measurement reporting window is the sixth preset interval position after the ACK feedback corresponding to the beam measurement request transmission, and the size of the sixth preset interval is predefined.

[0481] In an embodiment of the present application, for at least one of the above embodiments, the method may further include: sending at least one of the following configuration information to the second UE through PC5 RRC signaling:

[0482] (1) configuration information of multiple SL CSI-RS resources, wherein the configuration information of each SL CSI-RS resource includes at least one of an index number of the SL CSI-RS resource, a transmission configuration indicator TCI state ID, a frequency domain density, and an antenna port;

[0483] (2) Configuration information of multiple SL CSI-RS resource sets, wherein the configuration information of each SL CSI-RS resource set includes an index number of the SL CSI-RS resource set and configuration information of multiple SL CSI-RS resources.

[0484] In an embodiment of the present application, one SL CSI-RS transmission may correspond to one time slot, that is, one SL CSI-RS transmission is mapped to one time slot, or one SL CSI-RS transmission may correspond to two consecutive bypass time slots, that is, one SL CSI-RS transmission is mapped to two consecutive time slots; or, one SL CSI-RS transmission corresponds to several consecutive OFDM symbols, that is, one SL CSI-RS transmission is mapped to several consecutive OFDM symbols within one time slot.

[0485] The embodiment of the present application also provides a method performed by a second UE in a communication system, such as Fig.18a As shown, the method includes:

[0486] Step S401: Determine configuration parameters of a periodic SL CSI-RS window;

[0487] Step S402: determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within a periodic SL CSI-RS window;

[0488] Step S403: receiving a SL CSI-RS sent by a first UE on at least one resource;

[0489] Step S404: Send a measurement report based on the SL CSI-RS to the first UE.

[0490] The configuration parameters of the periodic SL CSI-RS window are determined based on at least one of the following methods:

[0491] receiving configuration parameters of a periodic SL CSI-RS window from a base station;

[0492] Preconfigured bypass parameters;

[0493] Configuration parameters of a periodic SL CSI-RS window are received from a first UE.

[0494] Optionally, the configuration parameters of the periodic SL CSI-RS window are determined based on at least one of the following methods:

[0495] receiving configuration parameters of a periodic SL CSI-RS window from a base station;

[0496] Preconfigured bypass parameters;

[0497] Configuration parameters of a periodic SL CSI-RS window are received from a first UE.

[0498] Optionally, the configuration parameters of the periodic SL CSI-RS window include at least one of the following:

[0499] The period size of the SL CSI-RS window;

[0500] The starting position of the SL CSI-RS window;

[0501] The length of the SL CSI-RS window;

[0502] The index number of one or more SL CSI-RS resources transmitted within the SL CSI-RS window;

[0503] The index number of one or more SL CSI-RS resource sets transmitted within the SL CSI-RS window;

[0504] The maximum number of SL CSI-RS resources allowed to be transmitted within the SL CSI-RS window;

[0505] The maximum number of SL CSI-RS resource sets allowed to be transmitted within the SL CSI-RS window;

[0506] The maximum number of SL CSI-RS time units allowed to be transmitted within the SL CSI-RS window.

[0507] Optionally, the starting position of the SL CSI-RS window is determined based on at least one of the following:

[0508] An identity number ID of the first UE;

[0509] ID of the second UE.

[0510] Optionally, the length or minimum length of the SL CSI-RS window is determined based on at least one of the following:

[0511] The number of SL CSI-RS resources configured for transmission within the SL CSI-RS window;

[0512] The number of SL CSI-RS resource sets configured for transmission within the SL CSI-RS window;

[0513] The number of SL CSI-RS time units configured for transmission within the SL CSI-RS window;

[0514] Subcarrier spacing size.

[0515] Optionally, the method further includes: receiving PC5 RRC signaling from the first UE to indicate configuration parameters of the periodic SL CSI-RS window.

[0516] Optionally, the method also includes: receiving a SL MAC CE from the first UE to activate or deactivate the periodic SL CSI-RS window.

[0517] Optionally, receiving a SL MAC CE from a first UE includes:

[0518] receiving a PSSCH from a first UE, the PSSCH carrying a SLMAC CE for activating or deactivating a periodic SL CSI-RS window;

[0519] Sending a PSFCH to the first UE, where the PSFCH carries confirmation ACK information corresponding to the PSSCH transmission;

[0520] The first time unit or the first bypass time unit that meets the first preset interval after the time unit in which the PSFCH is transmitted is used as the starting position of the SL CSI-RS window.

[0521] Optionally, step S402 may specifically include: determining at least one resource for SL CSI-RS transmission based on a resource subset, wherein the resource subset is determined based on a resource selection window, and the resource selection window is a most recent SL CSI-RS window.

[0522] Optionally, the resource selection window is a most recent SL CSI-RS window after a preset time interval is satisfied.

[0523] Optionally, at least one resource for SL CSI-RS transmission is determined based on a resource subset, including: in the case of configured Mode 2 resource allocation, the upper layer requests the physical layer to determine a resource subset for SL CSI-RS transmission, the physical layer determines all candidate resources in the most recent SL CSI-RS window after the request moment as an initial set of candidate resources, excludes candidate resources that meet preset conditions in the initial set based on sensing, and ensures that the number of remaining candidate resources is not less than a fourth preset number, determines the remaining set of candidate resources as a resource subset, reports the determined resource subset to the upper layer, and the upper layer selects at least one resource from the resource subset for SL CSI-RS transmission.

[0524] Optionally, each periodic SL CSI-RS window corresponds to one measurement report, and the measurement report is carried by the SL MACCE.

[0525] Optionally, the measurement report corresponding to the SL CSI-RS window of each period is sent by the second UE within a first preset delay boundary after at least one of the following time units:

[0526] The starting position of the SL CSI-RS window;

[0527] The end position of the SL CSI-RS window;

[0528] The time unit where the first SL CSI-RS transmission occurs within the SL CSI-RS window;

[0529] The time unit of the last SL CSI-RS transmission in the SL CSI-RS window.

[0530] Optionally, the value of the first preset delay boundary is configured by the first UE to the second UE through PC5 RRC signaling.

[0531] Optionally, the measurement report is a measurement result of the second UE on the SL CSI-RS received in the SL CSI-RS window, and the SL CSI-RS monitoring of the second UE in the SL CSI-RS window should meet at least one of the following expectations:

[0532] The second UE expects to receive at least one of at least one SL CSI-RS transmission, at least one SL CSI-RS resource, and at least one SL CSI-RS resource set within the SL CSI-RS window;

[0533] The second UE expects to receive at least one of at least a first preset number of SL CSI-RS transmissions, at least a second preset number of SL CSI-RS resources, and at least a third preset number of SL CSI-RS resource sets within the SL CSI-RS window.

[0534] Optionally, if the SL CSI-RS reception of the second UE within the SL CSI-RS window does not meet expectations, the operations performed by the second UE include at least one of the following:

[0535] The second UE does not trigger measurement reporting corresponding to the SL CSI-RS window;

[0536] The second UE triggers reporting of information of a negative NACK state;

[0537] The second UE triggers measurement reporting of the SL CSI-RS resources received within the SL CSI-RS window;

[0538] The second UE triggers reporting of information of the SL CSI-RS resource index number not received within the SL CSI-RS window.

[0539] Optionally, the SL CSI-RS is received by the second UE within a second SL DRX activation time, and the second SL DRX activation time includes at least one of the following time periods:

[0540] if a fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window are not received, a time period corresponding to the SL CSI-RS window;

[0541] If a fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received, a time period from the start position of the SL CSI-RS window to the time when the fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received;

[0542] The time period from the start position of the SL CSI-RS window to the time when the last SL CSI-RS transmission in the SL CSI-RS window is received, wherein the SCI associated with the SL CSI-RS transmission indicates whether the SL CSI-RS transmission is the last SL CSI-RS transmission in the SL CSI-RS window.

[0543] Optionally, if the SL CSI-RS transmission is configured to share a resource pool with the PSSCH transmission, there is no AGC symbol between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located;

[0544] If the SL CSI-RS transmission is configured with a dedicated resource pool, an AGC symbol is reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located. The AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0545] Optionally, if the dedicated resource pool is configured as the first mode, there is no AGC symbol between two adjacent SL CSI-RS resources in the time unit;

[0546] If the dedicated resource pool is configured as the second mode, an AGC symbol is reserved between two adjacent SL CSI-RS resources in a time unit, and the AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0547] Optionally, the SL CSI-RS transmission includes multiple SL CSI-RS resources within one time unit, and each of the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0548] Optionally, the method further comprises:

[0549] Receiving at least one of the following configuration information sent by the first UE through PC5 RRC signaling:

[0550] Configuration information of multiple SL CSI-RS resources, wherein the configuration information of each SL CSI-RS resource includes at least one of an index number of the SL CSI-RS resource, a transmission configuration indicator TCI state ID, a frequency domain density, and an antenna port;

[0551] Configuration information of multiple SL CSI-RS resource sets, wherein the configuration information of each SL CSI-RS resource set includes an index number of the SL CSI-RS resource set and configuration information of multiple SL CSI-RS resources.

[0552] The embodiment of the present application also provides a method performed by a second UE in a communication system, such as Fig.18b As shown, the method includes:

[0553] Step S501: receiving a first SCI sent by a first UE and a SL CSI-RS cluster scheduled by the first SCI, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster

[0554] Step S502: Send a measurement report based on the SL CSI-RS cluster to the first UE, wherein the measurement report is a measurement result of the second UE on multiple SL CSI-RSs on the indicated transmission resources.

[0555] Optionally, the first SCI is also used to indicate that resources are reserved according to a preset period and the preset period.

[0556] Optionally, the first SL CSI-RS transmission in the SL CSI-RS cluster is sent in the same time unit as the first SCI, or the first SL CSI-RS transmission in the SL CSI-RS cluster is sent after the time unit in which the first SCI is located.

[0557] Optionally, the method further includes: receiving, from the first UE, a PSSCH transmission indicated by the first SCI in the time unit where the first SCI is located;

[0558] Among them, the PSSCH carries the SL MAC CE, and the SL MAC CE is used to indicate the relevant information of the SL CSI-RS cluster.

[0559] Optionally, the relevant information of the SL CSI-RS cluster includes at least one of the following information:

[0560] Related information of measurement report corresponding to SL CSI-RS cluster;

[0561] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the transmission configuration indication TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0562] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0563] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0564] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster;

[0565] The relevant information reported by the measurement includes at least one of the following:

[0566] Information used to indicate that the type of the reported measurement indicator is at least one of RSRP, SINR and CSI;

[0567] Information used to indicate the number of SL CSI-RS resources reported corresponding to the best measurement indicator.

[0568] Optionally, the TCI state corresponding to the first SCI transmission is pre-indicated by the first UE to the second UE.

[0569] Optionally, after the time unit in which the first SCI is located, a second SCI is also sent in the time unit in which each SL CSI-RS in the SL CSI-RS cluster is transmitted;

[0570] The second SCI is at least used to indicate the resources for SL CSI-RS transmission within the time unit where the second SCI is located, and the second SCI is also used to indicate that the resources are reserved according to a preset period and the preset period.

[0571] Optionally, the second SCI is not expected to be decoded by the second UE.

[0572] Optionally, the second SCI is used to indicate the resource for transmission of each SL CSI-RS in the SL CSI-RS cluster; or,

[0573] The second SCI is used to indicate resources for each SL CSI-RS transmission after the second SCI in the SL CSI-RS cluster.

[0574] Optionally, the first SCI includes a first-stage SCI and a second-stage SCI, the second SCI includes the first-stage SCI, and the second SCI does not include the second-stage SCI.

[0575] Optionally, the second SCI is used to assist the second UE in performing measurement based on SL CSI-RS transmission associated with the second SCI.

[0576] Optionally, after the time unit where the first SCI is located, the symbol corresponding to the SCI in the time unit where each SL CSI-RS in the SL CSI-RS cluster is transmitted is a repetition of the SL CSI-RS signal on part of the symbols in the time unit.

[0577] Optionally, the method also includes: sending ACK information to the first UE on the PSFCH resources corresponding to the first SCI.

[0578] Optionally, an interval between a time unit where the first SCI is located and a time unit where a first SL CSI-RS transmission is located after the time unit where the first SCI is located is greater than or equal to a third preset interval; or,

[0579] The interval between the time unit where the PSFCH corresponding to the first SCI is located and the time unit where the first SLCSI-RS is transmitted after the time unit where the first SCI is located is greater than or equal to the fourth preset interval.

[0580] Optionally, the first SCI indicates the size of frequency domain resources occupied by SL CSI-RS transmission.

[0581] Optionally, if Mode 1 resource allocation is configured, the first SCI indicates a frequency domain position of a SL CSI-RS transmission, wherein the frequency domain position is applicable to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0582] If Mode 2 resource allocation is configured, the first SCI indicates the starting frequency domain position of each SL CSI-RS transmission in the SL CSI-RS cluster.

[0583] Optionally, the first field in the first SCI and the first field in the third SCI for scheduling PSSCH are used to indicate the SCI format for scheduling SL CSI-RS cluster or the SCI format for scheduling PSSCH; or,

[0584] The first SCI and the third SCI use different DMRS sequences; or,

[0585] The first SCI and the third SCI use the same first-phase SCI format and different second-phase SCI formats.

[0586] Optionally, the method further includes: padding the smaller one of the first SCI and the third SCI with zeros until the payload sizes of the two are equal.

[0587] Optionally, the measurement report corresponding to the SL CSI-RS cluster is sent by the second UE within a second preset delay boundary after at least one of the following time units:

[0588] The time unit in which the first SCI is transmitted;

[0589] The time unit in which the first SL CSI-RS in the SL CSI-RS cluster is transmitted;

[0590] The time unit in which the last SL CSI-RS in the SL CSI-RS cluster is transmitted.

[0591] Optionally, the value of the second preset delay boundary is configured by the first UE to the second UE through PC5 RRC signaling.

[0592] Optionally, the first SCI indicates at least one of the following information:

[0593] Related information of measurement report corresponding to SL CSI-RS cluster;

[0594] The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set;

[0595] Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster;

[0596] The relevant information reported by the measurement includes at least one of the following:

[0597] Information used to indicate that the type of the reported measurement indicator is at least one of RSRP, SINR and CSI;

[0598] Information used to indicate the number of SL CSI-RS resources reported corresponding to the best measurement indicator.

[0599] Optionally, the index number information of the SL CSI-RS resource set is indicated in a bitmap manner; or,

[0600] The index number information of at least one SL CSI-RS resource is indicated in a bitmap manner.

[0601] Optionally, if the SL CSI-RS transmission is configured to share a resource pool with the PSSCH transmission, there is no automatic gain control AGC symbol between the SL CSI-RS transmission and a physical bypass control channel PSCCH in the time unit where the SL CSI-RS transmission is located;

[0602] If the SL CSI-RS transmission is configured with a dedicated resource pool, an AGC symbol is reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located. The AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0603] Optionally, if the dedicated resource pool is configured as the first mode, there is no AGC symbol between two adjacent SL CSI-RS resources in the time unit;

[0604] If the dedicated resource pool is configured as the second mode, an AGC symbol is reserved between two adjacent SL CSI-RS resources in a time unit, and the AGC symbol is a copy of the SL CSI-RS signal on the first symbol after the AGC symbol.

[0605] Optionally, the SL CSI-RS transmission includes multiple SL CSI-RS resources within one time unit, and each of the multiple SL CSI-RS resources occupies at least two consecutive symbols.

[0606] Optionally, the method further includes: receiving, through PC5 RRC signaling, at least one of the following configuration information sent by the first UE:

[0607] Configuration information of multiple SL CSI-RS resources, wherein the configuration information of each SL CSI-RS resource includes at least one of an index number of the SL CSI-RS resource, a transmission configuration indicator TCI state ID, a frequency domain density, and an antenna port;

[0608] Configuration information of multiple SL CSI-RS resource sets, wherein the configuration information of each SL CSI-RS resource set includes an index number of the SL CSI-RS resource set and configuration information of multiple SL CSI-RS resources.

[0609] The methods executed by the second UE in each embodiment of the present application correspond to the methods in each embodiment on the first UE side. The detailed functional description and the beneficial effects produced can be specifically referred to the description of the corresponding methods shown in the embodiments on the first UE side in the previous text, and will not be repeated here.

[0610] An electronic device is provided in an embodiment of the present application, including a transceiver configured to send and receive signals; and a processor coupled to the transceiver and configured to implement the steps of the aforementioned method embodiments. Optionally, the electronic device may refer to a first UE or a second UE, and the processor is configured to implement the steps of the method embodiments performed by the first UE or the second UE. The detailed functional description and the beneficial effects produced can be specifically referred to the description of the method embodiments performed by the first UE or the second UE in the foregoing text, which will not be repeated here. In practical applications, the first UE or the second UE can be understood as different network nodes.

[0611] An embodiment of the present application also provides an electronic device, which includes a processor and, optionally, may also include a transceiver and / or a memory coupled to the processor, and the processor is configured to execute the steps of the method provided in any optional embodiment of the present application.

[0612] Fig.19 A schematic diagram of the structure of an electronic device applicable to an embodiment of the present invention is shown in FIG. Fig.19 As shown, Fig.19 The electronic device 4000 shown includes: a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, such as through a bus 4002. Optionally, the electronic device 4000 may also include a transceiver 4004, which can be used for data interaction between the electronic device and other electronic devices, such as data transmission and / or data reception. It should be noted that in actual applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 does not constitute a limitation on the embodiments of the present application. Optionally, the electronic device may be a first network node, a second network node, or a third network node.

[0613] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. Processor 4001 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0614] The bus 4002 may include a path to transmit information between the above components. The bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 4002 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.19 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0615] The memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium that can be used to carry or store computer programs and can be read by a computer, without limitation herein.

[0616] The memory 4003 is used to store the computer program for executing the embodiment of the present application, and the execution is controlled by the processor 4001. The processor 4001 is used to execute the computer program stored in the memory 4003 to implement the steps shown in the above method embodiment.

[0617] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps and corresponding contents of the aforementioned method embodiment can be implemented.

[0618] The embodiment of the present application also provides a computer program product, including a computer program, which can implement the steps and corresponding contents of the aforementioned method embodiment when executed by a processor.

[0619] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described in the drawings.

[0620] It should be understood that, although each operation step is indicated by arrows in the flowchart of the embodiment of the present application, the implementation order of these steps is not limited to the order indicated by the arrows. Unless clearly stated herein, in some implementation scenarios of the embodiment of the present application, the implementation steps in each flowchart can be performed in other orders according to demand. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, and each sub-step or stage in these sub-steps or stages may also be executed at different times respectively. In different scenarios of execution time, the execution order of these sub-steps or stages may be flexibly configured according to demand, and the embodiment of the present application does not limit this.

[0621] The above text and drawings are provided only as examples to help readers understand the present disclosure. They are not intended and should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the contents disclosed herein, it is obvious to those skilled in the art that the embodiments and examples shown can be changed without departing from the scope of the present disclosure, and other similar implementation means based on the technical ideas of the present application are adopted, which also belong to the protection scope of the embodiments of the present application.

Claims

1. A method performed by a first user equipment UE in a communication system, characterized in that: include: Determine configuration parameters of a periodic bypass channel state information reference signal SL CSI-RS window; determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within the periodic SL CSI-RS window; sending a SL CSI-RS to the second UE on the at least one resource; A measurement report based on the SL CSI-RS is received from the second UE.

2. The method according to claim 1, characterized in that The configuration parameters of the periodic SL CSI-RS window are determined based on at least one of the following methods: receiving configuration parameters of the periodic SL CSI-RS window from a base station; Preconfigured bypass parameters; A configuration parameter of the periodic SL CSI-RS window is received from the second UE.

3. The method according to claim 2, characterized in that The configuration parameters of the periodic SL CSI-RS window include at least one of the following: The period size of the SL CSI-RS window; The starting position of the SL CSI-RS window; The length of the SL CSI-RS window; The index number of one or more SL CSI-RS resources transmitted within the SL CSI-RS window; The index number of one or more SL CSI-RS resource sets transmitted within the SL CSI-RS window; The maximum number of SL CSI-RS resources allowed to be transmitted within the SL CSI-RS window; The maximum number of SL CSI-RS resource sets allowed to be transmitted within the SL CSI-RS window; The maximum number of SL CSI-RS time units allowed to be transmitted within the SL CSI-RS window.

4. The method according to claim 1, characterized in that: The SL CSI-RS window of each period corresponds to a measurement report, and the measurement report is carried by the SL MAC CE.

5. The method according to claim 1, characterized in that The measurement report corresponding to the SL CSI-RS window of each period is sent by the second UE within a first preset delay boundary after at least one of the following time units: The starting position of the SL CSI-RS window; the end position of the SL CSI-RS window; The time unit where the first SL CSI-RS transmission in the SL CSI-RS window occurs; The time unit where the last SL CSI-RS transmission in the SL CSI-RS window occurs.

6. The method according to claim 1, characterized in that Also includes: In case of being configured with Mode 1 resource allocation, the configuration parameters of the periodic SL CSI-RS window are reported to the base station.

7. The method according to claim 1, characterized in that The SL CSI-RS is received by the second UE within a second SL DRX activation time, where the second SL DRX activation time includes at least one of the following time periods: if a fifth preset number of SL CSI-RS transmissions within the SL CSI-RS window is not received, a time period corresponding to the SL CSI-RS window; If a fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received, a time period from the start position of the SL CSI-RS window to when the fifth preset number of SL CSI-RS transmissions in the SL CSI-RS window are received; The time period from the starting position of the SL CSI-RS window to the time when the last SL CSI-RS transmission in the SL CSI-RS window is received, wherein the bypass control information SCI associated with the SL CSI-RS transmission indicates whether the SL CSI-RS transmission is the last SL CSI-RS transmission in the SL CSI-RS window.

8. A method performed by a first user equipment UE in a communication system, characterized in that: include: Sending first bypass control information SCI and a bypass channel state information reference signal SL CSI-RS cluster scheduled by the first SCI to a second UE, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster; A measurement report based on the SL CSI-RS cluster is received from the second UE, wherein the measurement report is a measurement result of the second UE on the multiple SL CSI-RSs on the indicated transmission resources.

9. The method according to claim 8, characterized in that Also includes: Sending a PSSCH transmission indicated by the first SCI to the second UE in the time unit where the first SCI is located; The PSSCH carries the SL MAC CE, and the SL MAC CE is used to indicate relevant information of the SL CSI-RS cluster.

10. The method according to claim 8, characterized in that The relevant information of the SL CSI-RS cluster includes at least one of the following information: Relevant information of the measurement report corresponding to the SL CSI-RS cluster; The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster, and / or the transmission configuration indication TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set; The index number information of the SL CSI-RS resource set corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster, and / or the TCI state ID of at least one SL CSI-RS resource included in the SL CSI-RS resource set; Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission in the SL CSI-RS cluster; Index number information and / or TCI state ID of at least one SL CSI-RS resource corresponding to each SL CSI-RS transmission except the first SL CSI-RS transmission in the SL CSI-RS cluster; The relevant information reported by the measurement includes at least one of the following: Information used to indicate that the reported measurement indicator type is at least one of reference received power RSRP, signal to interference plus noise ratio SINR and CSI; Information used to indicate the number of SL CSI-RS resources reported corresponding to the best measurement indicator.

11. The method according to claim 8, characterized in that Also includes: Receive ACK information sent by the second UE on a physical bypass feedback channel PSFCH resource corresponding to the first SCI.

12. The method according to claim 11, characterized in that The interval between the time unit where the first SCI is located and the time unit where the first SL CSI-RS transmission is located after the time unit where the first SCI is located is greater than or equal to a third preset interval; or, An interval between a time unit where the PSFCH corresponding to the first SCI is located and a time unit where the first SLCSI-RS transmission is located after the time unit where the first SCI is located is greater than or equal to a fourth preset interval.

13. The method according to claim 8, characterized in that The measurement report corresponding to the SL CSI-RS cluster is sent by the second UE within a second preset delay boundary after at least one of the following time units: The time unit in which the first SCI is transmitted; A time unit in which the first SL CSI-RS in the SL CSI-RS cluster is transmitted; The time unit in which the last SL CSI-RS in the SL CSI-RS cluster is transmitted.

14. The method according to any one of claims 1 to 13, characterized in that: The receiving, from the second UE, a measurement report based on the SL CSI-RS, and / or the receiving, from the second UE, a measurement report based on the SL CSI-RS cluster, includes: Monitoring the SCI sent by the second UE within the first SL DRX activation time, wherein the PSSCH scheduled by the SCI carries the measurement report; receiving the measurement report based on the SCI; The first SL DRX activation time includes at least one of the following time periods: If the measurement report is not received, the time period corresponding to the third preset delay boundary window of the measurement report; If the measurement report is received, the time period from the starting position of the third preset delay boundary window of the measurement report to the time when the measurement report is received.

15. The method according to any one of claims 1 to 13, characterized in that: If the SL CSI-RS transmission is configured to share a resource pool with the PSSCH transmission, there is no automatic gain control AGC symbol between the SL CSI-RS transmission and the physical bypass control channel PSCCH in the time unit where the SL CSI-RS transmission is located; If the SL CSI-RS transmission is configured with a dedicated resource pool, an AGC symbol is reserved between the SL CSI-RS transmission and the PSCCH in the time unit where the SL CSI-RS transmission is located, and the AGC symbol is a copy of the SLCSI-RS signal on the first symbol after the AGC symbol.

16. A method performed by a second user equipment UE in a communication system, characterized in that: include: Determine configuration parameters of a periodic bypass channel state information reference signal SL CSI-RS window; determining at least one resource for SL CSI-RS transmission, wherein the at least one resource is within the periodic SL CSI-RS window; receiving, on the at least one resource, a SL CSI-RS sent by the first UE; Send a measurement report based on the SL CSI-RS to the first UE.

17. The method according to claim 16, characterized in that The measurement report is a measurement result of the second UE on the SL CSI-RS received in the SLCSI-RS window. The SLCSI-RS reception of the second UE in the SL CSI-RS window should meet at least one of the following expectations: The second UE expects to receive at least one of at least one SL CSI-RS transmission, at least one SLCSI-RS resource, and at least one SL CSI-RS resource set within the SL CSI-RS window; The second UE expects to receive at least one of a first preset number of SL CSI-RS transmissions, a second preset number of SL CSI-RS resources, and a third preset number of SL CSI-RS resource sets within the SL CSI-RS window.

18. The method according to claim 17, characterized in that If the SL CSI-RS reception of the second UE within the SL CSI-RS window does not meet the expectation, the operations performed by the second UE include at least one of the following: The second UE does not trigger measurement reporting corresponding to the SL CSI-RS window; The second UE triggers reporting of information of a negative acknowledgement (NACK) state; The second UE triggers measurement reporting of the SL CSI-RS resources received within the SL CSI-RS window; The second UE triggers reporting of information of the SL CSI-RS resource index number not received within the SL CSI-RS window.

19. A method performed by a second user equipment UE in a communication system, characterized in that: include: Receiving first bypass control information SCI sent by a first UE and a bypass channel state information reference signal SL CSI-RS cluster scheduled by the first SCI, wherein the first SCI indicates transmission resources for a plurality of SL CSI-RS transmissions included in the SL CSI-RS cluster; Sending a measurement report based on the SL CSI-RS cluster to the first UE, wherein the measurement report is a measurement result of the second UE on the multiple SL CSI-RSs on the indicated transmission resources.

20. A user equipment, characterized in that: include: transceiver, and A processor is coupled to the transceiver and configured to execute the method of any one of claims 1-15 or claims 16-19.

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