UE identification method and apparatus, terminal device, and storage medium

Abstract

Embodiments of the present application provide a UE identification method and apparatus, a terminal device, and a storage medium. A first UE establishes a connection with a second UE; the first UE sends first instruction information to the second UE, the first instruction information being used for instructing the first UE to send a first resource of an S-SSB; and the first UE sends the S-SSB on the first resource. The second UE receives the S-SSB on the first resource, and determines the S-SSB received on the first resource as the S-SSB sent by the first UE. In the embodiments, the first UE that has established a connection with the second UE informs the second UE of the first resource of the S-SSB sent by the first UE, such that the second UE knows that the first UE sends the S-SSB on the first resource. The second UE can directly locate the first resource to receive the S-SSB, thereby quickly establishing a connection with the first UE. The first UE can be identified without traversing all surrounding UEs.

Description

A UE identification method and device, terminal equipment and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on August 11, 2023, with application number 202311019554.1 and invention name "A UE identification method and its device, terminal equipment and storage medium", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The embodiments of the present application relate to the field of wireless communications, and in particular to a UE identification method and apparatus, terminal device, and storage medium. Background Art

[0004] Frequency Range 2 (FR2) sidelink is a new research area aimed at using high-frequency resources in FR2 (24.25 GHz to 71 GHz) to transmit sidelink services. This research specifically addresses various aspects of sidelink beams, including initial beam training, beam maintenance, and beam failure recovery.

[0005] In FR2, one of the functions of the Sidelink Synchronization Signal Block (S-SSB) is to perform beam tracking. The beam tracking process is introduced by taking the first UE and the second UE as an example: the second UE periodically sends multiple S-SSBs, and the first UE receives multiple S-SSBs from the second UE based on different beams. In a certain period, the first UE selects a reliable beam from the multiple beams receiving S-SSBs based on the signal quality of the multiple S-SSBs, and accesses the second UE through the reliable beam. In subsequent periods, the first UE periodically detects the signal quality of the S-SSB received on the reliable beam. If the signal quality always meets the signal quality requirements, there is no need to switch the beam. If the signal quality does not meet the signal quality requirements, a reliable beam is reselected. The beam tracking of the second UE by the first UE is realized.

[0006] When the first UE periodically sends multiple S-SSBs, the second UE can also monitor the S-SSBs sent by the first UE. For the second UE, there is not only the first UE in the surrounding area, but there may also be multiple other UEs, and multiple other UEs will also send S-SSBs, and these S-SSBs will also be monitored by the second UE. Although the first UE has accessed the second UE by monitoring the S-SSB sent by the second UE, the second UE cannot identify the first UE among the multiple UEs in the surrounding area through the S-SSBs sent by the surrounding UEs. In order to identify the first UE, the second UE needs to select a reliable beam for each surrounding UE through the S-SSBs sent by it, and then access each surrounding UE through a reliable beam before it can identify the first UE from the multiple UEs in the surrounding area. It can be seen that the process of the second UE discovering the first UE with which it has established a connection from the multiple UEs in the surrounding area is very time-consuming.

[0007] Summary of the Invention

[0008] The present application provides a UE identification method and apparatus, a terminal device, and a storage medium, so that a peer UE can quickly identify a UE with which a connection has been established from multiple UEs.

[0009] In the first aspect, a method for identifying a UE is provided, wherein the execution subject of the method may be a first UE, or a component applied to the first UE, such as a chip, a processor, etc. The following description is made by taking the execution subject being the first UE as an example. The first UE establishes a connection with the second UE. Then, the first UE sends a first indication message to the second UE, and the first indication message is used to indicate the first resource for the first UE to send a sidelink synchronization signal block S-SSB; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource. Next, the first UE sends the S-SSB on the first resource so that the second UE receives the S-SSB from the first resource.

[0010] In this embodiment, a first UE that has established a connection with a second UE informs the second UE of the first resource on which it sends the S-SSB, so that the second UE knows that the first UE is sending the S-SSB on the first resource. The second UE can directly locate the first resource to receive the S-SSB, and the second UE does not need to traverse all surrounding UEs to identify the first UE. Therefore, the second UE can quickly identify the first UE with which it has established a connection from multiple UEs, and the second UE can quickly perform beam tracking on the first UE.

[0011] In one possible implementation, the first resource is a first time domain resource; the first time domain resource is different from the time domain resource occupied by the S-SSB where the synchronization source of the first UE is located; and / or the first time domain resource is a time domain resource other than the time domain resource occupied by the second UE sending the S-SSB. When selecting the first time domain resource, the first UE avoids the time domain resource occupied by the S-SSB where the synchronization source is located, so as to avoid frequent switching of the synchronization source. The first UE preferentially selects the time domain resource that is not occupied by the UE that has established a connection with the first UE as the first time domain resource, so as to avoid the problem of transmission and reception conflicts with the UE that has established a connection.

[0012] In one possible implementation, the first resource is one of the multiple time domain resources configured by the configuration information for sending S-SSB.

[0013] In one possible implementation, when the first resource is a first time domain resource, the first time domain resource does not belong to the multiple time domain resources configured by the configuration information for sending an S-SSB, and the first time domain resource is outside a resource pool. In another possible implementation, when the first resource is a first time domain resource, the first resource is within a resource pool. A resource pool is a logical concept; a resource pool includes multiple physical resources, wherein the resources can be used to transmit data.

[0014] In one possible implementation, when the first resource is a first time domain resource, the first time domain resource is one of the multiple time domain resources configured by the configuration information for sending an S-SSB; the first indication information is used to indicate the number of the first time domain resource in the multiple time domain resources configured by the configuration information for sending an S-SSB; or, the first indication information is used to indicate that the first time domain resource is one of the multiple time domain resources configured by the configuration information for sending an S-SSB, excluding the time domain resource most recently occupied by the first UE before sending an S-SSB on the first time domain resource. Indicating the first time domain resource by number is simple and clear.

[0015] In one possible implementation, when the first resource is a first time domain resource, the first indication information includes: the number of S-SSBs allowed to be sent in an S-SSB transmission cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between the time slots for sending each S-SSB, and the first indication information is used to determine the time slots included in the first time domain resource. The first time domain resource is indicated by specific information, and the indication method is flexible.

[0016] In one possible implementation, when the first resource is a first time domain resource, the first time domain resource is in a resource pool; the first UE performs, for each of the multiple time slots included in the first time domain resource: sending a physical side link control channel PSCCH on the first symbol in the time slot, sending a side primary synchronization signal S-PSS and a side secondary synchronization signal S-SSS on a symbol located after the first symbol in the time slot, and the PSCCH is used to indicate a time slot for sending S-SSB located after the current time slot.

[0017] In one possible implementation, the first UE sends the S-PSS on a second symbol that is located after the first symbol and adjacent to the first symbol in the time slot, and sends the S-SSS on a third symbol that is located after the second symbol and adjacent to the second symbol. The S-PSS and S-SSS are not sent in subsequent symbols to avoid occupying excessive time domain resources.

[0018] In one possible implementation, the first UE further transmits an S-PSS and an S-SSS on symbols following the third symbol. The S-PSS and S-SSS are repeatedly transmitted to improve the efficiency of detecting the S-SSB.

[0019] In one possible implementation, when a physical sidelink feedback channel (PSFCH) is configured in the timeslot, the first UE transmits the S-PSS and S-SSS on some or all symbols in the timeslot that follow the first symbol and are outside the symbols used to transmit the PSFCH. That is, in the timeslot where the PSFCH is configured, the symbols used to transmit the PSFCH are not used to transmit the S-PSS and S-SSS to avoid conflict with the PSFCH.

[0020] In a possible implementation, the first indication information may be carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

[0021] In the second aspect, a method for identifying a UE is provided. The execution subject of the method may be a second UE, or a component applied to the second UE, such as a chip, a processor, etc. The following description is made by taking the execution subject being the second UE as an example. The second UE establishes a connection with the first UE; then, the second UE receives first indication information from the first UE, and the first indication information is used to indicate the first resource of the first UE to send a sidelink synchronization signal block S-SSB; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource. Next, the second UE receives the S-SSB on the first resource; the second UE determines the S-SSB received on the first resource as the S-SSB sent by the first UE. In one possible implementation, the first resource is a first time domain resource; the first time domain resource is different from the time domain resource occupied by the S-SSB where the synchronization source of the first UE is located; and / or the first time domain resource is a time domain resource other than the time domain resource occupied by the second UE to send the S-SSB.

[0022] In one possible implementation, the first resource is one of the multiple time domain resources configured by the configuration information for sending S-SSB.

[0023] In one possible implementation, the first resource is a first time domain resource, the first time domain resource does not belong to the multiple time domain resources configured in the configuration information for sending the S-SSB, and the first time domain resource is outside a resource pool. A resource pool is a logical concept that includes multiple physical resources, each of which can be used to transmit data.

[0024] In a possible implementation, the first resource is a first time domain resource, and the first resource is in a resource pool.

[0025] In one possible implementation, the first resource is a first time domain resource, which is one of the multiple time domain resources configured by the configuration information for sending S-SSB; the first indication information is used to indicate the number of the first time domain resource among the multiple time domain resources configured by the configuration information for sending S-SSB; or, the first indication information is used to indicate that the first time domain resource is one of the multiple time domain resources configured by the configuration information for sending S-SSB, except the time domain resource most recently occupied by the first UE before sending S-SSB on the first time domain resource.

[0026] In one possible implementation, the first resource is a first time domain resource, and the first indication information includes: the number of S-SSBs allowed to be sent in an S-SSB sending cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between the time slots for each S-SSB sending, and the first indication information is used to determine the time slots included in the first time domain resource.

[0027] In one possible implementation, the first resource is a first time domain resource, and the first time domain resource is in a resource pool; the second UE performs, for each of the multiple time slots included in the first time domain resource: receiving a physical side link control channel PSCCH on the first symbol in the time slot, and receiving a side primary synchronization signal S-PSS and a side secondary synchronization signal S-SSS on a symbol located after the first symbol in the time slot, wherein the PSCCH is used to indicate a time slot for sending an S-SSB located after the current time slot.

[0028] In one possible implementation, the second UE receives the S-PSS on a second symbol that is located after the first symbol and adjacent to the first symbol in the time slot, and receives the S-SSS on a third symbol that is located after the second symbol and adjacent to the second symbol.

[0029] In a possible implementation, the second UE further receives the S-PSS and S-SSS on symbols following the third symbol.

[0030] In one possible implementation, when a physical sidelink feedback channel PSFCH is configured in the time slot, the second UE receives S-PSS and S-SSS on part or all of the symbols in the time slot that are located after the first symbol and outside the symbols used to receive the PSFCH.

[0031] In a possible implementation, the first indication information may be carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

[0032] The technical effects of the second aspect and various possible implementations can refer to the technical effects of the first aspect and various possible implementations, and will not be repeated.

[0033] On the third aspect, a method for identifying a UE is provided, wherein the execution subject of the method may be a first UE, or a component applied in the first UE, such as a chip, a processor, etc. The following description is made by taking the execution subject being the first UE as an example. The first UE establishes a connection with the second UE; then, the first UE sends first configuration information to the second UE, and the first configuration information is used to configure at least one channel state information reference signal CSI-RS resource. Next, the first UE sends second indication information to the second UE, and the second indication information is used to instruct the second UE to perform channel measurement or beam tracking on the first UE only based on the at least one CSI-RS resource; the first UE sends CSI-RS on the at least one CSI-RS resource configured by the first configuration information.

[0034] In this embodiment, a first UE that has established a connection with a second UE informs the second UE of the CSI-RS resources, so that the second UE knows the resource location where the first UE transmits the CSI-RS. The second UE can directly locate the corresponding resource location to receive the CSI-RS transmitted by the first UE, without having to traverse all surrounding UEs to identify the first UE. This allows the second UE to quickly identify the first UE it has established a connection with from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on the first UE.

[0035] In one possible implementation, a first UE establishes a connection with a second UE, including: the first UE establishes a connection with the second UE based on an S-SSB received from the second UE on a first resource; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; after the first UE sends the first configuration information and the second indication information to the second UE, the first UE also sends an S-SSB on the first resource; wherein a set for detecting the quality of a wireless link includes an identifier of the CSI-RS resource and an identifier of the S-SSB sent by the first UE on the first resource. The beam associated with the CSI-RS resource is the same as the beam associated with the S-SSB, and the second UE implements beam tracking or channel measurement of the first UE through the CSI-RS resource.

[0036] In one possible implementation, if the multiple time domain resources configured in the second configuration information for sending an S-SSB are all occupied by other UEs connected to the first UE, the first UE does not send an S-SSB; the other UEs include at least the second UE. This can reduce power consumption of the first UE.

[0037] In a possible implementation, the second indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

[0038] In the fourth aspect, a method for identifying a UE is provided, wherein the execution subject of the method may be a second UE, or a component applied in the second UE, such as a chip, a processor, etc. The following description is made by taking the execution subject being the second UE as an example. The second UE establishes a connection with the first UE; then, the second UE receives first configuration information from the first UE, and the first configuration information is used to configure at least one channel state information reference signal CSI-RS resource. Next, the second UE receives second indication information from the first UE, and the second indication information is used to instruct the second UE to perform channel measurement or beam tracking on the first UE only based on the at least one CSI-RS resource. Next, the second UE receives the CSI-RS from the first UE on the at least one CSI-RS resource configured by the first configuration information; the second UE performs channel measurement or beam tracking on the first UE based on the CSI-RS received on the at least one CSI-RS resource.

[0039] In this embodiment, a first UE that has established a connection with a second UE informs the second UE of the CSI-RS resources, so that the second UE knows the resource location where the first UE transmits the CSI-RS. The second UE can directly locate the corresponding resource location to receive the CSI-RS transmitted by the first UE, without having to traverse all surrounding UEs to identify the first UE. This allows the second UE to quickly identify the first UE it has established a connection with from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on the first UE.

[0040] In a possible implementation, the second indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

[0041] In a fifth aspect, a communication device is provided, wherein the device has the functions of implementing any possible implementation of the first to fourth aspects and each aspect. These functions can be implemented through hardware or through hardware executing corresponding software implementations. The hardware or software includes one or more functional modules corresponding to the above functions.

[0042] In the sixth aspect, a communication device is provided, comprising a processor, and optionally, a memory; the processor and the memory are coupled; the memory is used to store computer programs or instructions; the processor is used to execute part or all of the computer programs or instructions in the memory, and when the part or all of the computer programs or instructions are executed, it is used to implement the functions of the first UE in the above-mentioned first aspect and any possible implementation of the first aspect, the third aspect and any possible implementation of the third aspect, or to implement the functions of the second UE in the above-mentioned second aspect and any possible implementation of the second aspect, the fourth aspect and any possible implementation of the fourth aspect.

[0043] In one possible implementation, the apparatus may further include a transceiver configured to transmit a signal processed by the processor or receive a signal input to the processor. The transceiver may perform the transmitting action or receiving action performed by the first UE in the first aspect and any possible implementation of the first aspect, or the third aspect and any possible implementation of the third aspect; or perform the transmitting action or receiving action performed by the second UE in the second aspect and any possible implementation of the second aspect, or the fourth aspect and any possible implementation of the fourth aspect.

[0044] In the seventh aspect, the present application provides a chip system, which includes one or more processors (also referred to as processing circuits), and the processors are electrically coupled to a memory (also referred to as a storage medium); the memory may be located in the chip system or not in the chip system; the memory is used to store computer programs or instructions; the processor is used to execute part or all of the computer programs or instructions in the memory, and when the part or all of the computer programs or instructions are executed, it is used to implement the functions of the first UE in the above-mentioned first aspect and any possible implementation of the first aspect, the third aspect and any possible implementation of the third aspect, or to implement the functions of the second UE in the above-mentioned second aspect and any possible implementation of the second aspect, the fourth aspect and any possible implementation of the fourth aspect.

[0045] In a possible implementation, the chip system may further include an input / output interface (also referred to as a communication interface), the input / output interface being used to output signals processed by the processor or to receive signals input to the processor. The input / output interface may execute the sending action or receiving action executed by the first UE in the first aspect and any possible implementation of the first aspect, the third aspect and any possible implementation of the third aspect; or, execute the sending action or receiving action executed by the second UE in the second aspect and any possible implementation of the second aspect, the fourth aspect and any possible implementation of the fourth aspect. Specifically, the output interface executes the sending action, and the input interface executes the receiving action.

[0046] In a possible implementation, the chip system may be composed of a chip, or may include a chip and other discrete devices.

[0047] In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program includes instructions for implementing the functions of any possible implementation of the first to fourth aspects and each aspect.

[0048] Alternatively, a computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, it can enable the computer to execute the method executed by the first UE in the above-mentioned first aspect and any possible implementation of the first aspect, the third aspect and any possible implementation of the third aspect, or execute the method executed by the second UE in the above-mentioned second aspect and any possible implementation of the second aspect, the fourth aspect and any possible implementation of the fourth aspect.

[0049] In the ninth aspect, a computer program product is provided, comprising: a computer program code, which, when the computer program code runs on a computer, enables the computer to execute the method executed by the first UE in the above-mentioned first aspect and any possible implementation of the first aspect, the third aspect and any possible implementation of the third aspect, or execute the method executed by the second UE in the above-mentioned second aspect and any possible implementation of the second aspect, the fourth aspect and any possible implementation of the fourth aspect.

[0050] In a tenth aspect, a communication system is provided, comprising a first UE executing the above-mentioned first aspect and any possible implementation of the first aspect and a second UE executing the above-mentioned second aspect and any possible implementation of the second aspect.

[0051] In the eleventh aspect, a communication system is provided, which includes a first UE executing the above-mentioned third aspect and any possible implementation of the third aspect and a second UE executing the above-mentioned fourth aspect and any possible implementation of the fourth aspect.

[0052] The technical effects of the above-mentioned fifth to eleventh aspects can refer to the descriptions in the first to fourth aspects, and the repeated parts will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1 is a schematic diagram of the architecture of a mobile communication system provided in an embodiment of the present application;

[0054] FIG2 is a schematic diagram of a UE identification process according to an embodiment of the present application;

[0055] FIG3a is a schematic structural diagram of an S-SSB of a PSCCH occupying three symbols provided in an embodiment of the present application;

[0056] FIG3 b is a schematic diagram of the structure of an S-SSB of a PSCCH occupying two symbols provided in an embodiment of the present application;

[0057] FIG3 c is a schematic structural diagram of an S-SSB of a PSCCH occupying three symbols provided in an embodiment of the present application;

[0058] FIG3 d is a schematic structural diagram of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0059] FIG3e is a schematic structural diagram of an S-SSB of a PSCCH occupying two symbols provided in an embodiment of the present application;

[0060] FIG3 f is a schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0061] FIG3g is a schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0062] FIG3h is a schematic structural diagram of an S-SSB of a PSCCH occupying two symbols provided in an embodiment of the present application;

[0063] FIG3i is a schematic diagram of the structure of an S-SSB of a PSCCH occupying two symbols provided in an embodiment of the present application;

[0064] FIG3j is a schematic structural diagram of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0065] FIG4 is a schematic diagram of a UE switching time-frequency resources provided in an embodiment of the present application;

[0066] FIG5 is a schematic diagram of different UEs occupying different time domain resources according to an embodiment of the present application;

[0067] FIG6 is a schematic diagram of a process of identifying a UE according to an embodiment of the present application;

[0068] FIG7 is a schematic diagram of a process of identifying a UE according to an embodiment of the present application;

[0069] FIG8 is a schematic structural diagram of an S-SSB in the prior art;

[0070] FIG9 is a schematic structural diagram of an S-SSB provided in an embodiment of the present application;

[0071] FIG10 is a schematic structural diagram of an S-SSB provided in an embodiment of the present application;

[0072] FIG11 is a schematic structural diagram of an S-SSB provided in an embodiment of the present application;

[0073] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0074] FIG13 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] Figure 1 is a schematic diagram of the architecture of a communication system used in an embodiment of the present application. As shown in Figure 1 , the communication system includes multiple terminals, namely terminal 11 to terminal 17, which can communicate with each other via sidelinks.

[0076] A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0077] Terminals can communicate with each other through licensed spectrum, unlicensed spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or both. The embodiments of this application do not limit the spectrum resources used for wireless communications.

[0078] In the embodiments of the present application, the functions of the terminal may be performed by a module (such as a chip or a modem) in the terminal, or may be performed by a device including the terminal functions.

[0079] To facilitate understanding of the embodiments of the present application, the application scenarios of the present application are introduced below. The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Ordinary technicians in this field can know that with the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0080] In frequency range 2 (FR2) (24.25 GHz to 71 GHz), beam tracking is performed between UEs through side synchronization signal blocks (S-SSBs) to ensure communication quality. Taking terminal 11 and terminal 14 in Figure 1 as an example, the beam tracking process is introduced: UE14 uses different beams to send multiple S-SSBs and direct communication requests (DCRs) on resource 1. The direct communication request includes the identifier of UE14. UE11 receives multiple S-SSBs and DCRs from UE14 based on different beams on resource 1. Based on the signal quality of multiple S-SSBs, UE11 selects a reliable beam from the multiple beams of the received S-SSBs, and sends information on establishing an initial beam pair to UE14 through the reliable beam, thereby establishing a connection with UE14. Specifically, UE11 receives multiple S-SSBs and DCRs from UE14 on resource 1 based on different spatial filters. UE11 selects an S-SSB that meets the signal quality requirements based on the signal quality of the multiple S-SSBs, and sends information about establishing an initial beam pair to UE14 based on the spatial filter used when receiving the S-SSB that meets the signal quality requirements. The communication connection between UE11 and UE14 is achieved through the S-SSB sent by UE14.

[0081] In addition, UE14 periodically transmits S-SSBs (the time domain resources in resource 1 are periodic). UE14 can use a single beam to transmit S-SSBs or multiple beams to transmit S-SSBs. After UE11 selects a reliable beam from multiple beams for receiving S-SSBs, it can periodically detect the signal quality of the S-SSBs received on the reliable beam. If the signal quality always meets the signal quality requirements, there is no need to switch beams. If the signal quality does not meet the signal quality requirements, it is necessary to reselect a reliable beam.

[0082] When UE11 transmits multiple S-SSBs using different beams on resource 2, UE14 can also monitor the S-SSBs transmitted by UE11 on resource 2. Similar to UE14, UE11 also needs to transmit multiple S-SSBs using one or more beams so that UEs connected to UE11 can monitor changes in the beam quality of UE11. For UE14, not only UE11 is nearby, but also UE15 and UE16. UE15 and UE16 will also transmit S-SSBs on their respective selected resources, and these S-SSBs will also be monitored by UE14 on the corresponding resources. Although UE11 has established a connection with UE14 by monitoring the S-SSB sent by UE14, UE14 cannot identify UE11 among the multiple surrounding UEs through the S-SSBs sent by the surrounding UEs on different resources. In order to identify UE11, UE14 needs to select a reliable beam for each surrounding UE through the multiple S-SSBs sent by it, and then establish a connection with each surrounding UE through a reliable beam before it can identify UE11 from the multiple surrounding UEs. It can be seen that the process of UE14 discovering UE11 that has established a connection with it from the multiple surrounding UEs is very time-consuming.

[0083] Based on this, the present application proposes a method for identifying UEs so that the originating UE that has established a communication connection through S-SSB can quickly identify the counterpart UE.

[0084] The following describes the solution provided by the embodiments of the present application in conjunction with the accompanying drawings.

[0085] It should be noted that “beam tracking or channel measurement of the first UE” in all embodiments of the present application means that the second UE selects a reliable beam to communicate with the first UE based on the signal quality of the signal (such as S-SSB or CSI-RS) sent by the first UE, and periodically receives the signal sent by the first UE through the reliable beam, and determines whether the reliable beam always meets the needs of subsequent communication through the signal strength of the received signal. If not, a new reliable beam is replaced. In addition, the “reliable beam” in all embodiments of the present application can be understood as “a beam used for communication or data transmission”. The “CSI-RS resource identifier” in all embodiments of the present application is specifically a CSI-RS resource configuration identifier, which refers to the identifier set for the CSI-RS resource by the first UE when performing CSI-RS resource configuration. The “CSI-RS resource” in all embodiments of the present application indicates the resources for the first UE to send CSI-RS, and the resources include: one or more of time domain resources, frequency domain resources and code domain resources. For example, time domain resources include the position of the time slot or symbol for sending CSI-RS, frequency domain resources include the subcarrier position occupied by sending CSI-RS in the frequency domain, and code domain resources include the sequence used by CSI-RS.

[0086] FIG2 shows a schematic diagram of a process for identifying a UE according to an embodiment of the present application, including the following steps:

[0087] Step 201: A first UE establishes a connection with a second UE.

[0088] In one possible implementation, the first UE establishes a connection with the second UE by monitoring the S-SSB sent by the second UE. For example, the first UE is UE11 in Figure 1, and the second UE is UE14 in Figure 1.

[0089] In step 201, the time domain resources occupied by the second UE for sending the S-SSB include the following examples: In one example, the time domain resources occupied by the second UE for sending the S-SSB are one of the N time domain resources configured by the second configuration information for sending the S-SSB. In one example, the time domain resources occupied by the second UE for sending the S-SSB do not belong to the multiple time domain resources configured by the second configuration information for sending the S-SSB, and are time domain resources outside the resource pool. In other words, the time domain resources occupied by the second UE for sending the S-SSB are: one time domain resource among the time domain resources outside the resource pool, excluding the multiple time domain resources configured by the second configuration information for sending the S-SSB. In one example, the time domain resources occupied by the second UE for sending the S-SSB are time domain resources within the resource pool. For the specific content of these examples of the time domain resources occupied by the second UE for sending the S-SSB, please refer to the relevant introduction of Example 1, Example 2 and Example 3 below regarding the first time domain resources.

[0090] Step 202: The first UE sends first indication information to the second UE, where the first indication information is used to instruct the first UE to send a first resource of an S-SSB.

[0091] Correspondingly, the second UE receives the first indication information from the first UE.

[0092] The first indication information is carried in a physical sidelink shared channel (PSSCH), a medium access control element (MAC-CE), or sidelink control information (SCI).

[0093] Step 203: The first UE sends an S-SSB on the first resource.

[0094] Correspondingly, the second UE receives S-SSB on the first resource.

[0095] Resources include: one or more of time domain resources, frequency domain resources and code domain resources. Based on this, the first resources include: one or more of first time domain resources, first frequency domain resources and first code domain resources.

[0096] The first frequency domain resource may be a specific frequency range. The first time domain resource will be described in detail later.

[0097] The following describes the first code domain resource: When the first UE generates an S-SSB, the first UE's identification information is one of the parameters that need to be considered. The first UE can carry the first UE's identification information in the first indication information. The second UE can determine the first UE's identification based on the first indication information. Furthermore, the second UE can determine the synchronization signal sequence to be detected, i.e., the first code domain resource, based on the first UE's identification information. The second UE can then receive the S-SSB based on the first code domain resource.

[0098] In one possible implementation, the first UE generates an S-PSS and / or S-SSS in the S-SSB based on the identification information of the first UE. The second UE determines the S-PSS sequence and / or S-SSS sequence in the first code domain resource based on the identification information of the first UE. In an optional example, the first indication information indicates the first time domain resource and the first code domain resource, so that the second UE can detect the code domain sequence (resource) on the first time domain resource.

[0099] Step 204: The second UE determines the S-SSB received on the first resource as the S-SSB sent by the first UE.

[0100] Subsequently, the second UE can perform beam tracking or channel measurement on the first UE based on the S-SSB sent by the first UE, that is, the second UE selects a reliable beam to communicate with the first UE based on the signal quality of the S-SSB sent by the first UE, and periodically receives the S-SSB sent by the first UE through a reliable beam, and determines whether the reliable beam always meets the needs of subsequent communications through the signal strength of the received S-SSB. If not, a new reliable beam is replaced. Signal quality can be reflected by reference signal received power (RSRP) and / or reference signal received quality (RSRQ).

[0101] To avoid transmission and reception conflicts, the resources occupied by the second UE when sending the S-SSB are not the first resources. If the second UE sends the S-SSB on the first resource, the second UE will not be able to receive the S-SSB from the first UE on the first resource.

[0102] In this embodiment, a first UE that has established a connection with a second UE informs the second UE of the first resource on which it sends the S-SSB, so that the second UE knows that the first UE is sending the S-SSB on the first resource. The second UE can directly locate the first resource to receive the S-SSB, and the second UE does not need to traverse all surrounding UEs to identify the first UE. Therefore, the second UE can quickly identify the first UE with which it has established a connection from multiple UEs, and the second UE can quickly perform beam tracking on the first UE.

[0103] In a possible example, based on FIG2 above, the first UE may further send first configuration information to the second UE, and correspondingly, the second UE receives the first configuration information from the first UE; the first configuration information is used to configure at least one channel state information reference signal (CSI-RS) resource; wherein, a set for detecting a wireless link includes an identifier of at least one channel state information reference signal CSI-RS resource configured by the first configuration information and an identifier of the S-SSB sent by the first UE on the first resource. It can be understood that: the signal sent by the first UE on at least one CSI-RS resource is the same as the beam used by the first UE to send the S-SSB on the first resource, that is, the beam associated with at least one CSI-RS resource is the same as the beam associated with the S-SSB sent by the first UE on the first resource.

[0104] On this basis, the second UE can perform beam tracking or channel measurement on the first UE based on the S-SSB received on the first resource and at least one CSI-RS resource configured by the first configuration information. This method needs to meet the premise that the resource occupied by the second UE when sending the S-SSB is not the first resource. If the second UE sends an S-SSB on the first resource, the second UE cannot receive the S-SSB from the first UE on the first resource.

[0105] In another possible example, the second UE sends an S-SSB on the first resource, the first UE sends first indication information and first configuration information to the second UE, the second UE determines based on the first indication information that it cannot receive the S-SSB sent by the first UE on the first resource, and the second UE performs beam tracking or channel measurement on the first UE according to at least one CSI-RS resource configured by the first configuration information, and no longer performs beam tracking or channel measurement on the first UE in combination with the S-SSB sent by the first UE.

[0106] A specific implementation method for the second UE to perform beam tracking or channel measurement on the first UE based on the at least one CSI-RS resource configured by the first configuration information is: the first UE sends CSI-RS on the at least one CSI-RS resource configured by the first configuration information, and accordingly, the second UE receives CSI-RS from the first UE on the at least one CSI-RS resource configured by the first configuration information; the second UE performs channel measurement or beam tracking on the first UE based on the CSI-RS received on the at least one CSI-RS resource.

[0107] The following introduces several examples in which the first resource is a first time domain resource (it can be understood that the examples of this application are numbered in no particular order and do not reflect the priority of the examples, and are only for the convenience of description):

[0108] Example 1: The first time domain resource is: one of the multiple time domain resources configured by the second configuration information for sending S-SSB.

[0109] The second configuration information configures the time domain resources for sending S-SSB, namely time allocation. The second configuration information can be sent by the base station to the UE, or it can be stored before the UE leaves the factory. In one example: the second configuration information includes: the number of S-SSBs allowed to be sent within an S-SSB transmission cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between the time slots for sending each S-SSB. For example, the transmission cycle of the S-SSB is 160ms.

[0110] In this application, the second configuration information configures at least 3 time domain resources for sending S-SSB.

[0111] The multiple time domain resources for sending S-SSB configured by the second configuration information are outside the resource pool (that is, time domain resources outside the resource pool). The so-called resource pool is a logical concept. A resource pool includes multiple physical resources, where resources are used to transmit data. When the UE transmits data, it needs to use one or more resources in the resource pool for transmission. The resource pool is configured by the parameter SL-ResourcePool in the TS38.331 standard, which includes parameters such as the number of symbols occupied by the control channel in the time slot and the period of the feedback channel.

[0112] The following describes an example of how the first indication information indicates one time domain resource among multiple time domain resources configured by the second configuration information for sending S-SSB.

[0113] Example 1.1: The first indication information is used to indicate the number of the first time domain resource among the multiple time domain resources configured by the second configuration information for sending S-SSB.

[0114] The second UE can use the number to identify which time domain resource among the multiple time domain resources configured by the second configuration information for sending the S-SSB that the first UE wants to use as the first time domain resource. Indicating the first time domain resource by number is simple and clear.

[0115] When the number of time domain resources for sending S-SSB configured by the second configuration information is less than or equal to 4, the first indication information can occupy 2 bits to indicate the number. For example, the second configuration information configures 3 time allocations for sending S-SSB, including: time allocation1, time allocation2, and time allocation3; when 2 bits is 00, it indicates time allocation1; when 2 bits is 01, it indicates time allocation2; when 2 bits is 10, it indicates time allocation3. This application does not limit which time allocation is specifically represented by different values ​​of 2 bits.

[0116] Example 1.2: The first indication information is used to indicate a time domain resource other than the second time domain resource among the multiple time domain resources for sending S-SSB configured by the second configuration information, wherein the second time domain resource is the time domain resource occupied by the first UE for the most recent transmission of S-SSB before sending the S-SSB on the first time domain resource.

[0117] Example 1.2 requires that the second UE knows that the time domain resource on which the first UE last sent an S-SSB before sending the S-SSB on the first time domain resource is the second time domain resource.

[0118] For example, the first indication information indicates the order of the first time domain resource among the multiple time domain resources configured by the second configuration information for sending the S-SSB, excluding the second time domain resource. The second UE can identify, through the order, which time domain resource excluding the second time domain resource among the multiple time domain resources configured by the second configuration information for sending the S-SSB that the first UE wants to use as the first time domain resource.

[0119] For example, the configuration information configures three time allocations for sending S-SSB, including: time allocation1, time allocation2 and time allocation3; the first UE occupies time allocation2 (i.e., the second time domain resource) to send S-SSB. After a period of time, the first UE decides to occupy time allocation1 (i.e., the first time domain resource) to send S-SSB. The first UE informs the second UE of time allocation1 through the first indication information. At this time, the first indication information can indicate a time allocation of the remaining two time allocations except time allocation2 (i.e., the second time domain resource). The first indication information can occupy 1 bit; when 1 bit is 0, it indicates the time allocation with an earlier ranking in the remaining time allocations. For example, the ranking is reflected by numbering, and the earlier the ranking, the smaller the number, that is, the time allocation with an earlier ranking is time allocation1; when 1 bit is 1, it indicates the time allocation with a later ranking in the remaining time allocations, that is, time allocation3.

[0120] This example 1.2 can be applied to the scenario where the first UE switches the time domain resources for sending S-SSB, that is, the first UE first sends S-SSB on the second time domain resources, and then switches to the first time domain resources to send S-SSB.

[0121] Example 1.3: The first indication information includes: the number of S-SSBs sent in an S-SSB transmission cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between the time slots for sending each S-SSB. The first indication information is used to determine the time slots included in the first time domain resource. The first time domain resource is indicated by specific information, and the indication method is flexible.

[0122] Typically, the transmission period of an S-SSB is 160ms.

[0123] The second UE can determine the time slot occupied by the first S-SSB by the offset value of the time slot in which the S-SSB is initially sent relative to the start time of the cycle. The second UE determines the time slots occupied by the second and subsequent S-SSBs based on the intervals between the time slots in which the S-SSBs are sent. The second UE determines the time slot occupied by the last S-SSB based on the number of S-SSBs sent in an S-SSB sending cycle. For example, if the offset value is 10 time slots, the number of S-SSBs sent is 4, and the interval is 20 time slots, the time slots in which the S-SSBs are sent in one cycle are numbered {10, 30, 50, 70} respectively. That is, the first time domain resources include: time slot 10, time slot 30, time slot 50, and time slot 70.

[0124] Example 2: The first time domain resource is: a time domain resource that does not belong to the multiple time domain resources configured by the second configuration information for sending an S-SSB, and the first time domain is outside the resource pool (that is, a time domain resource that does not belong to the resource pool). In other words, the first time domain resource is: a time domain resource among the time domain resources outside the resource pool, excluding the multiple time domain resources configured by the second configuration information for sending an S-SSB.

[0125] For example, the first indication information includes: the number of S-SSBs sent in an S-SSB transmission cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between the time slots for sending each S-SSB. The first indication information is used to determine the time slots included in the first time domain resource. The first time domain resource is indicated by specific information, and the indication method is flexible.

[0126] Let's introduce an example different from the example {10, 30, 50, 70} in Example 1.3. To avoid mutual interference, assume an offset of 20 time slots, four S-SSBs are sent, and the interval is 20 time slots. Then, the time slots for sending S-SSBs within a period are numbered {20, 40, 50, 80}. That is, the first time domain resources include time slot 20, time slot 40, time slot 60, and time slot 80.

[0127] Example 3: The first time domain resource is in a resource pool (ie, is a time domain resource in a resource pool).

[0128] The first time domain resources include multiple time slots. For each time slot, the first UE sends a physical sidelink control channel (PSCCH) on the first symbol in the time slot, and sends a sidelink primary synchronization signal (S-PSS) and a sidelink secondary synchronization signal (S-SSS) on the symbols after the first symbol; the PSCCH is used to indicate / reserve a time slot for sending S-SSB after the current time slot.

[0129] This application does not limit the transmission of the physical sidelink broadcast channel (PSBCH) in S-SSB.

[0130] In one example, the first symbol used to send the PSCCH includes two consecutive symbols starting from the second symbol, that is, the first symbol includes two symbols numbered 2 and 3 in the current time slot.

[0131] In one example, the first symbol used to send the PSCCH includes three consecutive symbols starting from the second symbol, that is, the first symbol includes three symbols numbered 2, 3, and 4 in the current time slot.

[0132] PSCCH can reserve the time slot after the current time slot to send S-SSB, which can avoid conflicts with other transmissions in the resource pool. In the current technology, when the UE sends S-SSB outside the resource pool, it does not need to consider other data transmissions in the resource pool. This example proposes that the UE sends S-SSB in the resource pool. Taking into account the compatibility with other transmissions, it is proposed to carry PSCCH in the process of sending S-SSB. The PSCCH indicates the time slot for sending S-SSB after the current time slot. The PSCCH reserves the time slot position for sending S-SSB several times in the future, thereby achieving the purpose of coexistence with other transmissions in the resource pool. After hearing the reservation, UEs other than the first UE can avoid the time slot reserved by the first UE, thereby avoiding transmission conflicts.

[0133] The following describes several examples of the first UE sending the S-PSS and S-SSS on symbols after the first symbol:

[0134] Example 3.1: In the time slot, the S-PSS is sent on a second symbol that is located after the first symbol and adjacent to the first symbol, and the S-SSS is sent on a third symbol that is located after the second symbol and adjacent to the second symbol. The S-PSS and S-SSS are not sent in subsequent symbols to avoid occupying excessive time domain resources.

[0135] In one example, the second symbol includes 2 symbols, and the third symbol includes 2 symbols.

[0136] As shown in Figure 3a, a possible structure of the S-SSB of the PSCCH occupying 3 symbols is introduced. Symbols 1 to 3 are used to send PSCCH, symbols 4 and 5 are used to send S-PSS, symbols 6 and 7 are used to send S-SSS, and symbols 8 and thereafter do not send S-PSS and S-SSS.

[0137] As shown in Figure 3b, a possible structure of the S-SSB of the PSCCH occupying 2 symbols is introduced, where symbols 1 and 2 are used to send the PSCCH, symbols 3 and 4 are used to send the S-PSS, symbols 5 and 6 are used to send the S-SSS, and symbols 7 and thereafter do not send the S-PSS and S-SSS.

[0138] Example 3.2: S-PSS is sent on the second symbol that is located after the first symbol and adjacent to the first symbol in the time slot, S-SSS is sent on the third symbol that is located after the second symbol and adjacent to the second symbol, and the symbol after the symbol used to send S-SSS is used to send S-PSS and S-SSS, that is, S-PSS and S-SSS can be repeatedly sent on subsequent idle symbols to improve the efficiency of detecting S-SSB.

[0139] As shown in Figure 3c, a possible S-SSB structure of a PSCCH occupying 3 symbols is introduced. Symbols 1 to 3 are used to send PSCCH, symbols 4 and 5 are used to send S-PSS, symbols 6 and 7 are used to send S-SSS, symbols 8 to 11 are repetitions of symbols 4 to 7, and symbol 12 is used to send S-SSS.

[0140] As shown in Figure 3d, a possible S-SSB structure of a PSCCH occupying 3 symbols is introduced, where symbols 1 to 3 are used to send PSCCH, symbols 4 and 5 are used to send S-PSS, symbols 6 and 7 are used to send S-SSS, symbols 8 to 11 are repetitions of symbols 4 to 7, and symbol 12 is used to send S-PSS.

[0141] As shown in Figure 3e, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced. Symbols 1 and 2 are used to send PSCCH, symbols 3 and 4 are used to send S-PSS, symbols 5 and 6 are used to send S-SSS, symbols 7 to 10 are repetitions of symbols 3 to 6, and symbols 11 and thereafter do not send S-PSS and S-SSS.

[0142] As shown in Figure 3f, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced. Symbols 1 and 2 are used to send PSCCH, symbols 3 and 4 are used to send S-PSS, symbols 5 and 6 are used to send S-SSS, symbols 7 to 10 are repetitions of symbols 3 to 6, and symbols 11 and 12 send S-PSS.

[0143] As shown in Figure 3g, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced. Symbols 1 and 2 are used to send PSCCH, symbols 3 and 4 are used to send S-PSS, symbols 5 and 6 are used to send S-SSS, symbols 7 to 10 are repetitions of symbols 3 to 6, and symbols 11 and 12 send S-SSS.

[0144] Furthermore, if a physical sidelink feedback channel (PSFCH) is configured in the time slot, the transmission of S-PSS and S-SSS needs to avoid PSFCH. Sending S-PSS and S-SSS on the symbol after the first symbol in the time slot includes: when the physical sidelink feedback channel PSFCH is configured in the time slot, sending S-PSS and S-SSS on part or all of the symbols after the first symbol in the time slot and outside the symbols used to send PSFCH. That is, in the time slot where PSFCH is configured, the symbols used to send PSFCH are not used to send S-PSS and S-SSS to avoid conflict with PSFCH.

[0145] Optionally, one symbol before the PSFCH needs to be left empty for transceiver conversion. That is, after the first symbol where the PSCCH is located and before one symbol before the symbol where the PSFCH is located, these intermediate symbols can be used to send S-PSS and S-SSS. In a time slot, if PSFCH is sent on symbols 12 and 13, symbols 12 and 13 should be avoided when sending S-PSS and S-SSS. It is also best to avoid symbol 11 because symbol 11 needs to be transceiver converted. Of course, the transceiver conversion can also be ignored, and S-PSS and S-SSS can be sent on all symbols in the time slot that are located after the first symbol and are not the symbols used to send PSFCH.

[0146] As shown in Figure 3h, a possible structure of the S-SSB of the PSCCH occupying 2 symbols is introduced, where symbols 1 and 2 are used to send PSCCH, symbols 3 and 4 are used to send S-PSS, symbols 5 and 6 are used to send S-SSS, and symbols 7 and 8 are used to send S-PSS.

[0147] As shown in Figure 3i, a possible structure of the S-SSB of the PSCCH occupying 2 symbols is introduced, where symbols 1 and 2 are used to send PSCCH, symbols 3 and 4 are used to send S-PSS, symbols 5 and 6 are used to send S-SSS, symbols 7 and 8 are used to send S-PSS, and symbol 9 is used to send S-SSS.

[0148] As shown in Figure 3j, a possible structure of the S-SSB of the PSCCH occupying 3 symbols is introduced, where symbols 1 to 3 are used to send PSCCH, symbols 4 and 5 are used to send S-PSS, symbols 6 and 7 are used to send S-SSS, and symbols 8 and 9 are used to send P-SSS.

[0149] In a possible example, the first UE preferentially selects one of the multiple time domain resources for sending the S-SSB configured by the second configuration information as the first time domain resource. When it is determined that the multiple time domain resources for sending the S-SSB configured by the second configuration information are all occupied by other UEs connected to the first UE or by surrounding UEs (regardless of whether the surrounding UEs are connected to the first UE), there are the following possible solutions to determine the first time domain resource;

[0150] Solution 1: Still select one time domain resource from the multiple time domain resources configured by the second configuration information for sending the S-SSB as the first time domain resource. The first time domain resource selected by Solution 1 is exactly the same as Example 1 described above.

[0151] Solution 2: Select a time domain resource from the time domain resources outside the resource pool, excluding the multiple time domain resources configured by the second configuration information for sending the S-SSB, as the first time domain resource. The first time domain resource selected using Solution 2 is exactly Example 2 described above. That is, Example 2 described above can be applied to a scenario where the first UE detects that the multiple time domain resources configured by the second configuration information for sending the S-SSB are all occupied by surrounding UEs. Of course, this scenario is only an example and does not limit Example 2.

[0152] Solution 3: Selecting a first time domain resource from the resource pool. The first time domain resource selected using Solution 3 is exactly Example 3 described above. (i.e., Example 3). That is, Example 3 described above can be applied to a scenario where the first UE detects that the multiple time domain resources configured by the second configuration information for transmitting S-SSBs are all occupied by surrounding UEs. Of course, this scenario is merely an example and does not limit Example 3.

[0153] In one example, the first UE may periodically and cyclically execute Solution 1, that is, at intervals, it selects a time domain resource from the multiple time domain resources configured by the second configuration information for sending S-SSB to send S-SSB, rather than constantly occupying a certain time domain resource. If the first UE constantly occupies a certain time domain resource, when a new UE that needs to communicate appears on the occupied time domain resource, the first UE cannot detect it. By periodically changing the time domain resource, the first UE can ensure that it is accessible to potential UEs for communication when no beam failure occurs in the existing link.

[0154] As shown in FIG4 , an example of periodically changing time domain resources is introduced.

[0155] The first UE first sends an S-SSB on time allocation 3. UEa sends an S-SSB on time allocation 1, UEb sends an S-SSB on time allocation 2, and UEc also sends an S-SSB on time allocation 3. The first UE establishes a connection with UEb based on the S-SSB sent by UEb. The first UE establishes a connection with UEa based on the S-SSB sent by UEa. Due to a transmission / reception conflict, the first UE cannot monitor the S-SSB sent by UEc.

[0156] After a while, the first UE wants to switch to sending S-SSBs on time allocation 1. The first UE sends a first indication to UEb, indicating time allocation 1. The first UE switches to sending S-SSBs on time allocation 1. The first UE can monitor the S-SSBs sent by UEc on time allocation 3 and establish a connection with UEc.

[0157] After a period of time, the first UE wants to switch to sending S-SSBs on time allocation 3. The first UE sends a first indication message to UEb and / or UEa, indicating time allocation 3. The first UE switches to sending S-SSBs on time allocation 3. The first UE can monitor S-SSBs sent by UEs other than those occupying time allocation 3.

[0158] In one possible scenario, before the first UE sends the first indication information to the second UE in step 202, the first UE sends an S-SSB on the second time domain resource. In this scenario, the first UE switches the time domain resource for sending the S-SSB from the second time domain resource to the first time domain resource. The first UE notifies the second UE of the switched first time domain resource to avoid the second UE failing to detect the S-SSB on the second time domain resource and deeming beam tracking failure.

[0159] The following introduces several examples of the second time domain resource: In one example, the second time domain resource is one of the multiple time domain resources configured by the second configuration information for sending S-SSB. In one example, the second time domain resource is: a time domain resource outside the resource pool, excluding the multiple time domain resources configured by the second configuration information for sending S-SSB. In one example, the second time domain resource is: a time domain resource within the resource pool. For the specific content of these examples of the second time domain resource, please refer to the relevant introduction of Example 1, Example 2, and Example 3 above regarding the first time domain resource, and no further details will be given.

[0160] In another possible scenario, step 203: the first UE sends an S-SSB on the first time domain resource, specifically: the first UE sends an S-SSB on the first time domain resource for the first time. The first UE has not sent an S-SSB since startup, the first UE sends an S-SSB for the first time, and selects the first time domain resource to send the S-SSB.

[0161] The first time domain resource used by the first UE to send the S-SSB satisfies the following conditions: the first time domain resource is different from the time domain resource occupied by the S-SSB where the synchronization source of the first UE is located; and / or, the first time domain resource is a time domain resource other than the time domain resource occupied by the second UE to send the S-SSB, or in other words, the first time domain resource is a time domain resource occupied by a UE that has not established a connection with the first UE.

[0162] When selecting the first time domain resource, the first UE avoids the time domain resource occupied by the S-SSB where the synchronization source is located, so as to avoid frequent switching of the synchronization source. After any UE sends an S-SSB, the surrounding UEs can monitor the S-SSB, and the surrounding UEs will determine the priority of the S-SSB based on the synchronization ID contained in the monitored S-SSB, and then determine the synchronization source based on the priority of the S-SSB. The synchronization ID refers to the category of the synchronization source used by the UE that sends the S-SSB. For example, the synchronization source of the UE is the global navigation satellite system (GNSS). If any UE generates an S-PSS and S-SSS based on the synchronization ID, the S-PSS and S-SSS in the S-SSB sent by any UE will contain the synchronization ID corresponding to the GNSS, and the S-SSS or S-PSS is generated based on the synchronization ID. The surrounding UEs can determine the synchronization source corresponding to the synchronization ID of the S-SSB with the highest priority as their own synchronization source. When the priorities are the same, the synchronization source corresponding to the synchronization ID of the S-SSB with the strongest reference signal received power (RSRP) is determined as their own synchronization source.

[0163] For example, when switching synchronization sources, the first UE sends an S-SSB in time allocation 3. The first UE searches for synchronization sources in time allocation 1 and time allocation 2. The first UE uses the synchronization source on time allocation 2 as the synchronization source of the first UE. After a period of time, the first UE switches the first time domain resource for sending the S-SSB to time allocation 2. The first UE loses synchronization. The first UE searches for synchronization sources in time allocation 1 and time allocation 3. The first UE uses the synchronization source on time allocation 3 as the synchronization source of the first UE. After a period of time, the first UE switches the first time domain resource for sending the S-SSB to time allocation 3. The first UE loses synchronization. The first UE searches for synchronization sources in time allocation 1 and time allocation 2.

[0164] For example, if the synchronization source is not switched, the first UE sends an S-SSB in time allocation 3. The first UE searches for a synchronization source in time allocation 1 and time allocation 2. The first UE uses the synchronization source on time allocation 2 as the synchronization source of the first UE. After a period of time, the first UE switches the first time domain resource for sending the S-SSB to time allocation 1. The first UE can still use the synchronization source on time allocation 2 as the synchronization source of the first UE. After a period of time, the first UE switches the first time domain resource for sending the S-SSB to time allocation 3. The first UE can still use the synchronization source on time allocation 2 as the synchronization source of the first UE.

[0165] The first UE selects the time allocation occupied by the S-SSB where the synchronization source is located (for example, time allocation 2) as the first time domain resource for sending the S-SSB. The first UE will lose synchronization and need to find the synchronization source again. The first UE avoids the time allocation occupied by the S-SSB where the synchronization source is located and selects the first time domain resource for sending the S-SSB (for example, selecting the first time domain resource from time allocation 1 and time allocation 3), which can avoid frequent switching of the synchronization source.

[0166] In the example where the synchronization source is not switched, the first UE switches the first time domain resource for sending the S-SSB to time allocation 1. Possible reasons why the first UE can still use the synchronization source on time allocation 2 as its synchronization source are: the priority of the synchronization source on time allocation 2 is higher than the priority of the synchronization source on time allocation 3; or the priority of the synchronization source on time allocation 2 is the same as the priority of the synchronization source on time allocation 3, but the RSRP of the S-SSB detected on time allocation 2 is higher than the RSRP of the S-SSB detected on time allocation 3. Similarly, if the first UE switches the first time domain resource for sending the S-SSB to time allocation 3, the first UE can still use the synchronization source on time allocation 2 as its synchronization source. Possible reasons why the first UE can still use the synchronization source on time allocation 2 as its synchronization source are: the priority of the synchronization source on time allocation 2 is higher than the priority of the synchronization source on time allocation 3; or the priority of the synchronization source on time allocation 2 is the same as the priority of the synchronization source on time allocation 3, but the RSRP of the S-SSB detected on time allocation 2 is higher than the RSRP of the S-SSB detected on time allocation 3.

[0167] The first UE preferentially selects the time domain resources that are not occupied by the UE that has established a connection with the first UE as the first time domain resources, so as to avoid the problem of transmission and reception conflicts with the UE that has established a connection. For example, UEa sends S-SSB on time allocation 1, and UEb sends S-SSB on time allocation 2. The first UE establishes a connection with UEb based on the S-SSB sent by UEb. The first UE establishes a connection with UEa based on the S-SSB sent by UEa. The first UE can select time allocation 3 as the first time domain resource to send S-SSB, avoiding time allocation 1 occupied by UEa that has established a connection to send S-SSB and time allocation 2 occupied by UEb to send S-SSB.

[0168] In one possible scenario, the first UE determines, through the monitored S-SSB, that the N time domain resources configured by the second configuration information for sending S-SSBs are all occupied by multiple surrounding UEs. For example, the N time domain resources are: time allocation 1, time allocation 2, and time allocation 3. Figure 5 shows a schematic diagram of different UEs occupying different time domain resources. The first UE monitors the S-SSBs sent by the surrounding UEs and detects that the S-SSB of UEa occupies time allocation 1, the S-SSB of UEb occupies time allocation 2, and the S-SSB of UEc occupies time allocation 3. If the first UE repeatedly occupies any of the time domain resources (for example, time allocation 3) to send S-SSBs, then due to the transmission and reception conflict, the surrounding UEs (for example, UEc) occupying the repeated time domain resources will find it difficult to detect the S-SSBs sent by the first UE. In this case, the first UE can send configuration information to the surrounding UEs occupying the repeated time domain resources to configure CSI-RS resources so that the surrounding UEs occupying the repeated time domain resources can perform beam tracking on the first UE based on the CSI-RS resources.

[0169] In another possible scenario, the first UE determines, through the monitored S-SSB, that N-1 time domain resources of the N time domain resources configured by the second configuration information for sending S-SSB are occupied by multiple surrounding UEs, and the remaining time domain resource is occupied by the first UE itself. For example, the first UE monitors the S-SSBs sent by the surrounding UEs, detects that the S-SSB of UEa occupies time allocation 1, the S-SSB of UEb occupies time allocation 2, and the first UE has occupied time allocation 3 to send S-SSB for UEa and UEb to track the S-SSB beam of the first UE. In this case, there is also the problem that UEc occupying time allocation 3 has difficulty detecting the S-SSB of the first UE. In this case, the first UE can send configuration information to UEc to configure CSI-RS resources so that the surrounding UEs occupying the duplicate time domain resources can perform beam tracking on the first UE based on the CSI-RS resources.

[0170] FIG6 shows a schematic diagram of another process for identifying a UE according to an embodiment of the present application, which introduces a process for identifying a UE by using configured CSI-RS resources, including the following steps:

[0171] Step 601: A first UE establishes a connection with a second UE.

[0172] In one possible implementation, the first UE establishes a connection with the second UE by monitoring the S-SSB sent by the second UE. For example, the first UE is UE11 in Figure 1, and the second UE is UE14 in Figure 1.

[0173] Step 602: The first UE sends first configuration information to the second UE, where the first configuration information is used to configure at least one channel state information reference signal CSI-RS resource.

[0174] Correspondingly, the second UE receives the first configuration information from the first UE.

[0175] In one possible implementation, the first UE sends first configuration information to the second UE based on the spatial domain filter used when receiving the S-SSB from the second UE.

[0176] Step 603: The first UE sends second indication information to the second UE, where the second indication information is used to instruct the second UE to perform beam tracking or channel measurement on the first UE only based on the at least one CSI-RS resource configured by the first configuration information. In other words, the second indication information is used to instruct the second UE to perform beam tracking or channel measurement on the first UE based on the at least one CSI-RS resource configured by the first configuration information, without performing beam tracking or channel measurement on the first UE based on the S-SSB.

[0177] Correspondingly, the second UE receives second indication information from the first UE.

[0178] The second indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

[0179] Step 602 and step 603 may be performed simultaneously, or step 602 may be performed earlier than step 603 .

[0180] The first configuration information and the second indication information may be carried in the same message or in different messages.

[0181] In one possible implementation, the first UE sends second indication information to the second UE based on the spatial domain filter used when receiving the S-SSB from the second UE.

[0182] Step 604: After receiving the second indication information, the second UE responds to the second indication information and performs beam tracking or channel measurement on the first UE only according to the at least one CSI-RS resource configured by the first configuration information.

[0183] In other words: after the second UE receives the second indication information, it performs beam tracking or channel measurement on the first UE according to the at least one CSI-RS resource configured by the first configuration information, and the second UE does not need to perform beam tracking or channel measurement on the first UE according to S-SSB.

[0184] The second UE performs beam tracking or channel measurement on the first UE based on the at least one CSI-RS resource configured by the first configuration information. A specific implementation manner is: the first UE sends a CSI-RS on the at least one CSI-RS resource configured by the first configuration information, and accordingly, the second UE receives a CSI-RS from the first UE on the at least one CSI-RS resource configured by the first configuration information. The second UE performs channel measurement or beam tracking on the first UE based on the CSI-RS received on the at least one CSI-RS resource.

[0185] The CSI-RS resources in this application indicate the resources used by the first UE to send CSI-RS, and the resources include: one or more of time domain resources, frequency domain resources, and code domain resources. For example, the time domain resources include the position of the time slot or symbol where the CSI-RS is sent, the frequency domain resources include the subcarrier position occupied by the CSI-RS in the frequency domain, and the code domain resources include the sequence used by the CSI-RS. The second UE receives the CSI-RS sent by the first UE at the corresponding time domain and / or frequency domain and / or code domain position based on the CSI-RS resources configured in the first configuration information.

[0186] In this embodiment, a first UE that has established a connection with a second UE configures CSI-RS resources for the second UE, so that the second UE knows the resource location of the CSI-RS transmitted by the first UE. The second UE can directly locate the corresponding resource location to receive the CSI-RS transmitted by the first UE, without having to traverse all surrounding UEs to identify the first UE. Therefore, the second UE can quickly identify the first UE with which it has established a connection from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on the first UE.

[0187] In existing technologies, a UE performs beam tracking or channel measurement on another UE based on both the configured CSI-RS resources and the S-SSB. In this example, beam tracking or channel measurement is performed on the UE based on the CSI-RS received on the configured CSI-RS resources, eliminating the need to detect the S-SSB. This reduces UE power consumption and prevents the beam tracking or channel measurement from being considered a failure due to the lack of S-SSB detection.

[0188] In this example, the second UE does not need to consider the S-SSB sent by the first UE when performing beam tracking or channel measurement on the first UE. For the first UE, the first UE may send an S-SSB or not.

[0189] In one example, when the multiple time domain resources configured by the second configuration information for sending S-SSB are all occupied by other UEs (the other UEs include at least the second UE) connected to the first UE, the first UE does not send S-SSB; when the multiple time domain resources configured by the second configuration information for sending S-SSB are not all occupied by other UEs connected to the first UE, the first UE sends S-SSB. And the first time domain resource for the first UE to send S-SSB is the unoccupied time domain resource among the multiple time domain resources configured by the second configuration information for sending S-SSB. In other words: the first UE only sends S-SSB on the time domain resources other than the time domain resources occupied by other UEs connected to the first UE among the multiple time domain resources configured by the second configuration information for sending S-SSB. When the other UEs connected to the first UE occupy all the time domain resources configured by the second configuration information for sending S-SSB, the first UE does not send S-SSB.

[0190] For example, as shown in Figure 5, the second configuration information configures three time allocations for sending S-SSBs: time allocation 1, time allocation 2, and time allocation 3. The first UE detects that UEa sends an S-SSB on time allocation 1, UEb sends an S-SSB on time allocation 2, and UEc sends an S-SSB on time allocation 3, and the first UE has established connections with all three UEs. At this point, no matter which time allocation the first UE selects to send an S-SSB, a transmission / reception conflict will occur. Therefore, the first UE does not need to send an S-SSB.

[0191] In another example, the first UE does not consider whether the multiple time domain resources configured by the second configuration information for sending S-SSB are all occupied, and the first UE does not send S-SSB.

[0192] In another example, the first UE sends the S-SSB regardless of whether the multiple time domain resources configured by the second configuration information for sending the S-SSB are all occupied. The first UE will send the S-SSB.

[0193] In the example of the first UE sending an S-SSB, the resources occupied by the S-SSB sent by the first UE and the resources occupied by the S-SSB sent by the second UE may be the same or different. The process of Figure 6 can be applied to the scenario where the resources occupied by the first UE sending the S-SSB and the resources occupied by the second UE sending the S-SSB are the same, and can also be applied to the scenario where the resources occupied by the first UE sending the S-SSB and the resources occupied by the second UE sending the S-SSB are different.

[0194] Taking the first UE sending S-SSB as an example, another possible example is introduced: it is set that the first UE sends S-SSB on the first resource. In an optional example, the relationship between the at least one CSI-RS resource configured by the first configuration information and the beam for sending S-SSB is restricted, specifically: a set for detecting wireless links includes the identifier of at least one CSI-RS resource configured by the first configuration information and the identifier of the S-SSB sent by the first UE on the first resource. It can be understood that: the signal sent by the first UE on at least one CSI-RS resource is the same as the beam used by the first UE to send S-SSB on the first resource, that is, the beam associated with at least one CSI-RS resource is the same as the beam associated with the S-SSB sent by the first UE on the first resource.

[0195] In combination with the UE identification process described in FIG2 and FIG6 , as shown in FIG7 , another possible UE identification method is introduced:

[0196] Step 701: For the first UE, it can monitor the S-SSBs sent by multiple surrounding UEs and establish connections with multiple surrounding UEs based on the S-SSBs.

[0197] A first UE intends to transmit an S-SSB on a first resource. Among multiple surrounding UEs, some may also transmit S-SSBs on the first resource, while others may not. For ease of description, these UEs that do not transmit S-SSBs on the first resource are referred to as surrounding UE1, and these UEs that transmit S-SSBs on the first resource are referred to as surrounding UE2. Surrounding UE1 can be one or more UEs, and surrounding UE2 can be one or more UEs.

[0198] For the surrounding UE1 that does not send S-SSB on the first resource, the first UE and the surrounding UE1 can execute the UE identification process described in Figure 2, and regard these surrounding UE1 as the second UE in the process of Figure 2. For the surrounding UE2 that sends S-SSB on the first resource, the first UE and these surrounding UE2 can execute the UE identification process described in Figure 6, and regard these surrounding UE2 as the second UE in the process of Figure 6. That is, the first UE sends a first indication message to the surrounding UE1 to inform the first UE to send S-SSB on the first resource, so that these surrounding UE1 listen to the S-SSB from the first UE on the first resource. The first UE sends a first configuration message and a second indication message to the surrounding UE2 to inform these surrounding UE2 to perform beam tracking or channel measurement on the first UE according to the at least one CSI-RS resource configured by the first configuration information, without the need to perform beam tracking or channel measurement on the first UE according to the S-SSB. Because of the transmission and reception conflict, even if the first UE sends the first indication information to the surrounding UE2 that sends S-SSB on the first resource to inform the first UE of S-SSB on the first resource, these surrounding UE2s will not be able to monitor the S-SSB sent by the first UE on the first resource. Therefore, these surrounding UE2s can perform beam tracking or channel measurement on the first UE according to the at least one CSI-RS resource configured by the first configuration information, without the need to perform beam tracking or channel measurement on the first UE according to the S-SSB.

[0199] For a surrounding UE that does not send an S-SSB on the first resource, that is, a surrounding UE1, the following steps are performed:

[0200] Step 702a: The first UE sends first indication information to the surrounding UE1, where the first indication information is used to instruct the first UE to send the first resource of S-SSB.

[0201] Correspondingly, the surrounding UE1 receives the first indication information from the first UE.

[0202] The specific process of step 702a is described in step 202 and will not be repeated here.

[0203] Step 703a: The first UE sends an S-SSB on the first resource.

[0204] Correspondingly, the surrounding UE1 receives S-SSB on the first resource.

[0205] Step 704a: The surrounding UE1 determines the S-SSB received on the first resource as the S-SSB sent by the first UE.

[0206] For a surrounding UE that sends an S-SSB on the first resource, that is, a surrounding UE2, the following steps are performed:

[0207] Step 702b: The first UE sends first configuration information to the surrounding UE2. Correspondingly, the surrounding UE2 receives the first configuration information from the first UE.

[0208] The first configuration information is used to configure at least one channel state information reference signal CSI-RS resource; wherein, a set for detecting a wireless link includes an identifier of at least one channel state information reference signal CSI-RS resource configured by the first configuration information and an identifier of the S-SSB sent by the first UE on the first resource. It can be understood that: the beam used by the first UE to send a signal on at least one CSI-RS resource is the same as the beam used by the first UE to send an S-SSB on the first resource, that is, the beam associated with at least one CSI-RS resource is the same as the beam associated with the S-SSB sent by the first UE on the first resource.

[0209] The CSI-RS resources configured by the first configuration information sent by the first UE to different surrounding UE2s may be the same or different.

[0210] Step 703b: The first UE sends second indication information to the surrounding UE2, where the second indication information is used to instruct the second UE to perform beam tracking or channel measurement on the first UE only based on the at least one CSI-RS resource configured by the first configuration information. In other words, the second indication information is used to instruct the second UE to perform beam tracking or channel measurement on the first UE based on the at least one CSI-RS resource configured by the first configuration information, without performing beam tracking or channel measurement on the first UE based on the S-SSB.

[0211] Correspondingly, the surrounding UE2 receives the second indication information from the first UE.

[0212] Step 704b: After receiving the second indication information, the surrounding UE2 responds to the second indication information and performs beam tracking or channel measurement on the first UE only according to the at least one CSI-RS resource configured by the first configuration information.

[0213] In other words: after the surrounding UE2 receives the second indication information, the surrounding UE2 performs beam tracking or channel measurement on the first UE according to the at least one CSI-RS resource configured by the first configuration information, and the surrounding UE2 does not need to perform channel measurement or beam tracking on the first UE according to S-SSB.

[0214] A specific implementation method of the surrounding UE2 performing beam tracking or channel measurement on the first UE according to the at least one CSI-RS resource configured by the first configuration information is: the first UE sends CSI-RS on the at least one CSI-RS resource configured by the first configuration information, and accordingly, the surrounding UE2 receives CSI-RS from the first UE on the at least one CSI-RS resource configured by the first configuration information; the surrounding UE2 performs channel measurement or beam tracking on the first UE based on the CSI-RS received on the at least one CSI-RS resource.

[0215] In a possible example, the UE receiving the first configuration information in the present application can perform channel measurement based on at least one CSI-RS resource indicated by the first configuration information, where the channel is the channel between the first UE and the UE receiving the first configuration information.

[0216] The UE that receives the first configuration information sends the channel measurement results corresponding to the at least one CSI-RS resource to the first UE. Correspondingly, the first UE receives the channel measurement results corresponding to the at least one CSI-RS resource.

[0217] In an optional example, the first configuration information configures multiple CSI-RS resources, and the first UE receives multiple channel measurement results. The first UE selects a channel measurement result that meets the conditions from the multiple channel measurement results, and uses the beam used for transmission on the CSI-RS resource corresponding to the selected channel measurement result that meets the conditions as the beam for subsequent communication with the UE that received the first configuration information.

[0218] In an optional example, the first configuration information configures a CSI-RS resource, and the first UE receives a channel measurement result. The first UE determines a transmission code rate based on the channel measurement result, and adjusts the transmission code rate based on the channel measurement result to achieve better communication quality.

[0219] Figure 8 shows an existing S-SSB structure. In a time slot, the PSBCH is transmitted in symbol 0, the S-PSS is transmitted in symbols 1 and 2, the S-SSS is transmitted in symbols 3 and 4, and the PSBCH is transmitted in symbols 5 to 12.

[0220] In existing technologies, in FR1, S-SSB is used only for UE synchronization. In FR2, S-SSB also has the function of beam tracking. For S-SSB used only for beam tracking, this application stipulates that symbols starting from symbol 5 and after symbol 5 are no longer used to transmit PSBCH. In other words, S-SSB no longer occupies symbols 5 and after symbol 5. This can reduce transmission overhead and lower UE transmission power consumption.

[0221] In addition, symbol 0 can still be used to send PSBCH, or it can be used to send S-PSS or S-SSS.

[0222] Referring to Figure 9, symbol 0 is used to send PSBCH, symbol 1 and symbol 2 are used to send S-PSS, symbol 3 and symbol 4 are used to send S-SSS, symbol 5 and subsequent symbols are no longer used to send PSBCH, and S-SSB no longer occupies symbol 5 and the symbols after symbol 5.

[0223] Referring to Figure 10, symbol 0 is used to send S-PSS, symbol 1 and symbol 2 are used to send S-PSS, symbol 3 and symbol 4 are used to send S-SSS, symbol 5 and subsequent symbols are no longer used to send PSBCH, and S-SSB no longer occupies symbol 5 and the symbols after symbol 5.

[0224] Referring to Figure 11, symbol 0 is used to send S-SSS, symbol 1 and symbol 2 are used to send S-PSS, symbol 3 and symbol 4 are used to send S-SSS, symbol 5 and subsequent symbols are no longer used to send PSBCH, and S-SSB no longer occupies symbol 5 and the symbols after symbol 5.

[0225] It is understood that, in order to implement the functions in the above embodiments, the first UE and the second UE include hardware structures and / or software modules corresponding to the respective functions. Those skilled in the art should readily appreciate that, in conjunction with the various exemplary units and method steps described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0226] Figures 12 and 13 are schematic diagrams of the structures of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the second UE or the first UE in the above-mentioned method embodiments, thereby also achieving the beneficial effects possessed by the above-mentioned method embodiments. In the embodiments of the present application, the communication device can be one of UE11 to UE17 as shown in Figure 1, or a module (such as a chip) applied to the second UE or the first UE.

[0227] As shown in Figure 12, the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220. The communication device 1200 is used to implement the functions of the second UE or the first UE in the method embodiments shown in Figures 2, 4, 6, and 7 above.

[0228] When the communication device 1200 is used to implement the function of the first UE in the method embodiment shown in Figure 2: the transceiver unit 1220 is used to: receive the S-SSB from the second UE, send the first indication information to the second UE, and send the S-SSB on the first resource; the processing unit 1210 is used to: establish a connection with the second UE based on the S-SSB from the second UE.

[0229] When the communication device 1200 is used to implement the function of the second UE in the method embodiment shown in Figure 2: the transceiver unit 1220 is used to: send an S-SSB, receive first indication information from the first UE, and receive the S-SSB on the first resource; the processing unit 1210 is used to: determine the S-SSB received on the first resource as the S-SSB sent by the first UE.

[0230] A more detailed description of the processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to the relevant description in the method embodiment shown in Figure 2, and will not be repeated here. A more detailed description of the first indication information and the first resource can be directly obtained by referring to the relevant description in the method embodiment, and will not be repeated here.

[0231] When the communication device 1200 is used to implement the function of the first UE in the method embodiment shown in Figure 6: the transceiver unit 1220 is used to: receive the S-SSB from the second UE, send the first configuration information and the second indication information to the second UE, and send the CSI-RS on the CSI-RS resources configured by the first configuration information; the processing unit 1210 is used to: establish a connection with the second UE based on the S-SSB from the second UE.

[0232] When the communication device 1200 is used to implement the function of the second UE in the method embodiment shown in Figure 6: the transceiver unit 1220 is used to: send S-SSB, receive first configuration information and second indication information from the first UE, and receive CSI-RS on the CSI-RS resource configured by the first configuration information; the processing unit 1210 is used to: perform channel measurement or beam tracking on the first UE only based on the CSI-RS received on at least one CSI-RS resource.

[0233] A more detailed description of the processing unit 1210 and the transceiver unit 1220 can be directly obtained by referring to the relevant description of the method embodiment shown in Figure 6, and is not repeated here. A more detailed description of the first configuration information and the second indication information can be directly obtained by referring to the relevant description of the method embodiment, and is not repeated here.

[0234] As shown in Figure 13, communication device 1300 includes a processor 1310 and an interface circuit 1320. Processor 1310 and interface circuit 1320 are coupled to each other. It is understood that interface circuit 1320 can be a transceiver or an input / output interface. Optionally, communication device 1300 may also include a memory 1330 for storing instructions executed by processor 1310, input data required by processor 1310 to execute instructions, or data generated by processor 1310 after executing instructions.

[0235] When the communication device 1300 is used to implement the method shown in FIG. 12 , the processor 1310 is used to implement the functions of the processing unit 1210 , and the interface circuit 1320 is used to implement the functions of the transceiver unit 1220 .

[0236] When the above-mentioned communication device is a module applied to a first UE, the first UE module implements the functions of the first UE in the above-mentioned method embodiment. The first UE module receives information from other modules in the first UE (such as a radio frequency module or an antenna), and the information is sent by the second UE to the first UE; or the first UE module sends information to other modules in the first UE (such as a radio frequency module or an antenna), and the information is sent by the first UE to the second UE.

[0237] When the above-mentioned communication device is a chip applied to a second UE, the second UE chip implements the functions of the second UE in the above-mentioned method embodiment. The second UE chip receives information from other modules (such as a radio frequency module or antenna) in the second UE, and the information is sent by the first UE to the second UE; or the second UE chip sends information to other modules (such as a radio frequency module or antenna) in the second UE, and the information is sent by the second UE to the first UE.

[0238] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0239] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in the first UE or the second UE. Of course, the processor and the storage medium can also exist in the first UE or the second UE as discrete components.

[0240] The present application also provides a computer-readable storage medium storing a computer program, which, when executed by a computer, enables the computer to perform the above-mentioned UE identification method. In other words, the computer program includes instructions for implementing the above-mentioned UE identification method.

[0241] An embodiment of the present application further provides a computer program product, including: computer program code, which, when executed on a computer, enables the computer to execute the UE identification method provided above.

[0242] An embodiment of the present application further provides a communication system, which includes: a first UE and a second UE that execute the above-mentioned UE identification method.

[0243] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0244] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0245] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0246] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A method for identifying a UE, characterized in that: include: The first UE establishes a connection with the second UE; The first UE sends first indication information to the second UE, where the first indication information is used to instruct the first UE to send a first resource of a sidelink synchronization signal block S-SSB; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; The first UE sends the S-SSB on the first resource so that the second UE receives the S-SSB from the first resource.

2. The method according to claim 1, characterized in that The first resource is a first time domain resource; The first time domain resource is different from the time domain resource occupied by the S-SSB where the synchronization source of the first UE is located; and / or, The first time domain resources are time domain resources other than the time domain resources occupied by the second UE to send S-SSB.

3. The method according to claim 1 or 2, characterized in that The first resource is a first time domain resource; The first time domain resource is one of the multiple time domain resources configured by the configuration information for sending the S-SSB; or, The first time domain resource does not belong to the multiple time domain resources configured by the configuration information for sending S-SSB, and the first time domain resource is outside the resource pool; or, The first time domain resource is in a resource pool.

4. The method according to any one of claims 1 to 3, characterized in that: The first resource is a first time domain resource, and the first time domain resource is one of multiple time domain resources configured by the configuration information for sending the S-SSB; The first indication information is used to indicate the number of the first time domain resource in the multiple time domain resources configured in the configuration information for sending the S-SSB; or, The first indication information is used to indicate that the first time domain resource is a time domain resource among the multiple time domain resources configured in the configuration information for sending S-SSB, except the time domain resource most recently occupied by the first UE before sending the S-SSB on the first time domain resource.

5. The method according to any one of claims 1 to 3, characterized in that: The first resource is a first time domain resource, and the first indication information includes: the number of S-SSBs allowed to be sent in an S-SSB sending cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between each time slot for sending the S-SSB, and the first indication information is used to determine the time slots included in the first time domain resource.

6. The method according to any one of claims 1 to 3, characterized in that: The first resource is a first time domain resource, and the first time domain resource is in a resource pool; The sending, by the first UE, of an S-SSB on the first time domain resource includes: For each time slot of the multiple time slots included in the first time domain resource, executing: A physical side link control channel PSCCH is sent on the first symbol in the time slot, and a side primary synchronization signal S-PSS and a side secondary synchronization signal S-SSS are sent on the symbol after the first symbol in the time slot, and the PSCCH is used to indicate a time slot for sending S-SSB after the current time slot.

7. The method according to claim 6, characterized in that Sending an S-PSS and an S-SSS on a symbol located after the first symbol in the time slot, comprising: The S-PSS is transmitted on a second symbol that is subsequent to the first symbol and adjacent to the first symbol in the time slot, and the S-SSS is transmitted on a third symbol that is subsequent to the second symbol and adjacent to the second symbol.

8. The method according to claim 7, characterized in that Also includes: The S-PSS and S-SSS are transmitted on symbols following the third symbol.

9. The method according to any one of claims 6 to 8, characterized in that: Sending an S-PSS and an S-SSS on a symbol located after the first symbol in the time slot, comprising: When a physical sidelink feedback channel PSFCH is configured in the time slot, S-PSS and S-SSS are transmitted on part or all of the symbols in the time slot that are located after the first symbol and outside the symbols used to transmit the PSFCH.

10. The method according to any one of claims 1 to 9, characterized in that: The first indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

11. A method for identifying a UE, characterized in that: include: The second UE establishes a connection with the first UE; The second UE receives first indication information from the first UE, where the first indication information is used to indicate a first resource of the first UE to send a sidelink synchronization signal block S-SSB; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; The second UE receives an S-SSB on the first resource; The second UE determines the S-SSB received on the first resource as the S-SSB sent by the first UE.

12. The method according to claim 11, characterized in that The first resource is a first time domain resource; The first time domain resource is different from the time domain resource occupied by the S-SSB where the synchronization source of the first UE is located; and / or, The first time domain resources are time domain resources other than the time domain resources occupied by the second UE to send S-SSB.

13. The method according to claim 11 or 12, characterized in that The first resource is a first time domain resource; The first time domain resource is one of the multiple time domain resources configured by the configuration information for sending the S-SSB; or, The first time domain resource does not belong to the multiple time domain resources configured by the configuration information for sending S-SSB, and the first time domain resource is outside the resource pool; or, The first time domain resource is in a resource pool.

14. The method according to any one of claims 11 to 13, characterized in that: The first resource is a first time domain resource, and the first time domain resource is one of multiple time domain resources configured by the configuration information for sending the S-SSB; The first indication information is used to indicate the number of the first time domain resource in the multiple time domain resources configured in the configuration information for sending the S-SSB; or, The first indication information is used to indicate that the first time domain resource is a time domain resource among the multiple time domain resources configured in the configuration information for sending S-SSB, except the time domain resource most recently occupied by the first UE before sending the S-SSB on the first time domain resource.

15. The method according to any one of claims 11 to 13, characterized in that: The first resource is a first time domain resource, and the first indication information includes: the number of S-SSBs allowed to be sent in an S-SSB sending cycle, the offset value of the time slot for initially sending the S-SSB relative to the start time of the cycle, and the interval between each time slot for sending the S-SSB, and the first indication information is used to determine the time slots included in the first time domain resource.

16. The method according to any one of claims 11 to 13, characterized in that: The first resource is a first time domain resource, and the first time domain resource is in a resource pool; Receiving, by the second UE, the S-SSB from the first UE on the first resource, includes: For each time slot of the multiple time slots included in the first time domain resource, executing: A physical side link control channel PSCCH is received on the first symbol in the time slot, and a side primary synchronization signal S-PSS and a side secondary synchronization signal S-SSS are received on the symbol following the first symbol in the time slot, wherein the PSCCH is used to indicate a time slot following the current time slot for sending an S-SSB.

17. The method according to claim 16, characterized in that Receiving an S-PSS and an S-SSS on a symbol following the first symbol in the time slot, comprising: The S-PSS is received on a second symbol that is subsequent to the first symbol and adjacent to the first symbol in the time slot, and the S-SSS is received on a third symbol that is subsequent to the second symbol and adjacent to the second symbol.

18. The method according to claim 17, characterized in that Also includes: The S-PSS and S-SSS are received on symbols following the third symbol.

19. The method according to any one of claims 16 to 18, characterized in that: Receiving an S-PSS and an S-SSS on a symbol following the first symbol in the time slot, comprising: When a physical sidelink feedback channel PSFCH is configured in the time slot, S-PSS and S-SSS are received on part or all of the symbols in the time slot that are located after the first symbol and outside the symbols used to receive the PSFCH.

20. The method according to any one of claims 11 to 19, characterized in that: The first indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

21. A method for identifying a UE, characterized in that: include: The first UE establishes a connection with the second UE; The first UE sends first configuration information to the second UE, where the first configuration information is used to configure at least one channel state information reference signal CSI-RS resource; The first UE sends second indication information to the second UE, where the second indication information is used to instruct the second UE to perform channel measurement or beam tracking on the first UE only according to the at least one CSI-RS resource; The first UE sends a CSI-RS on at least one CSI-RS resource configured by the first configuration information.

22. The method according to claim 21, characterized in that The first UE establishes a connection with the second UE, including: The first UE establishes a connection with the second UE based on the S-SSB received from the second UE on the first resource; wherein the resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; After the first UE sends the first configuration information and the second indication information to the second UE, the method further includes: The first UE sends an S-SSB on the first resource; wherein a set for detecting the quality of a wireless link includes an identifier of the CSI-RS resource and an identifier of the S-SSB sent by the first UE on the first resource.

23. The method of claim 21, wherein: Also includes: When the multiple time domain resources configured by the second configuration information for sending S-SSB are all occupied by other UEs connected to the first UE, the first UE does not send S-SSB; wherein the other UEs include at least the second UE.

24. The method according to any one of claims 21 to 23, characterized in that The second indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

25. A method for identifying a UE, characterized in that: include: The second UE establishes a connection with the first UE; The second UE receives first configuration information from the first UE, where the first configuration information is used to configure at least one channel state information reference signal CSI-RS resource; The second UE receives second indication information from the first UE, where the second indication information is used to instruct the second UE to perform channel measurement or beam tracking on the first UE only according to the at least one CSI-RS resource; The second UE receives the CSI-RS from the first UE on at least one CSI-RS resource configured by the first configuration information; The second UE performs channel measurement or beam tracking on the first UE only based on the CSI-RS received on at least one CSI-RS resource.

26. The method of claim 25, wherein: The second indication information is carried in a physical sidelink shared channel PSSCH, a media access channel control element MAC-CE, or sidelink control information SCI.

27. A communication device, characterized in that: include: A functional module for implementing the method according to any one of claims 1 to 26.

28. A communication device, characterized in that: include: a processor coupled to the memory; The processor is used to execute part or all of the computer programs or instructions in the memory, and when the part or all of the computer programs or instructions are executed, it is used to implement the method according to any one of claims 1 to 26.

29. A communication device, characterized in that: include: Processor and memory; The memory is used to store computer programs or instructions; The processor is used to execute part or all of the computer programs or instructions in the memory, and when the part or all of the computer programs or instructions are executed, it is used to implement the method according to any one of claims 1 to 26.

30. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein the computer program includes instructions for implementing the method according to any one of claims 1 to 26.

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