UE identification method and device, terminal equipment and storage medium

Abstract

The embodiment of the invention provides a UE (User Equipment) identification method and device, terminal equipment and a storage medium. The UE identification method and device are used for an opposite-end UE to quickly identify UE which is connected with the opposite-end UE from multiple UEs. The first UE establishes a connection with the second UE; the first UE sends first indication information to the second UE, wherein the first indication information is used for indicating the first UE to send the first resource of the S-SSB; and the first UE sends the S-SSB on the first resource. And 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 embodiment, the first UE which has established a connection with the second UE informs the second UE of the first resource for sending the S-SSB by the first UE, so that the second UE knows that the first UE sends the S-SSB on the first resource. In this way, the second UE can be directly positioned on the first resource to receive the S-SSB, so that the connection with the first UE can be quickly established. The first UE can be identified without traversing all peripheral UEs.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communications, and in particular, to a UE identification method and apparatus, terminal equipment, and storage medium. Background Art

[0002] Sidelink frequency range 2 (FR2) is a new research direction, which aims to use the high-frequency resources of FR2 (24.25 GHz to 71 GHz) to transmit sidelink services. Specifically, it involves various directions related to sidelink beams, including initial beam training, beam maintenance, and beam failure recovery.

[0003] 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 for 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.

[0004] 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 around, but also multiple other UEs. 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 around it through the S-SSBs sent by the surrounding UEs. If the second UE wants to identify the first UE, it 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 around it. It can be seen that the process of the second UE discovering the first UE that has established a connection with it from the multiple UEs around it is very time-consuming. Summary of the invention

[0005] The present application provides a UE identification method and apparatus, a terminal device and a storage medium, so that a counterpart UE can quickly identify a UE with which a connection has been established from multiple UEs.

[0006] 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 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 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.

[0007] In this embodiment, the first UE that has established a connection with the second UE tells the second UE 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, so that the second UE can quickly identify the first UE that has established a connection with it from multiple UEs, and the second UE can quickly perform beam tracking on the first UE.

[0008] 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. 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.

[0009] In a possible implementation, the first resource is one time domain resource among multiple time domain resources configured by configuration information for sending S-SSB.

[0010] 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 S-SSB, and the first time domain resource is outside the resource pool. In another possible implementation, when the first resource is a first time domain resource, the first resource is in the resource pool. A resource pool is a logical concept, and a resource pool includes multiple physical resources, wherein the resources can be used to transmit data.

[0011] In a 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 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 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 for the time domain resource most recently occupied by the first UE before sending S-SSB on the first time domain resource. Indicating the first time domain resource by number is simple and clear.

[0012] In a 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 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. The first time domain resource is indicated by specific information, and the indication method is flexible.

[0013] In a 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 executes, 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 second 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.

[0014] In a 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 too many time domain resources.

[0015] In a possible implementation, the first UE further sends S-PSS and S-SSS on symbols after the third symbol. The S-PSS and S-SSS are repeatedly sent to improve the efficiency of detecting S-SSB.

[0016] In a possible implementation, when a physical sidelink feedback channel PSFCH is configured in the time slot, the first UE sends 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 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.

[0017] 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.

[0018] In the second aspect, a method for identifying a UE is provided, and 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 a 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 a 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.

[0019] In a possible implementation, the first resource is one time domain resource among multiple time domain resources configured by configuration information for sending S-SSB.

[0020] In a 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 by the configuration information for sending S-SSB, and the first time domain resource is outside the resource pool. A resource pool is a logical concept, and a resource pool includes multiple physical resources, wherein the resources can be used to transmit data.

[0021] In a possible implementation, the first resource is a first time domain resource, and the first resource is in a resource pool.

[0022] In one possible implementation, the first resource is a first time domain resource, and the first time domain resource 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 in 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.

[0023] 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 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.

[0024] 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 a first symbol in the time slot, receiving a side primary synchronization signal S-PSS and a side second 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.

[0025] 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.

[0026] In a possible implementation, the second UE further receives the S-PSS and the S-SSS on a symbol following the third symbol.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In 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 at least one CSI-RS resource configured by the first configuration information.

[0031] In this embodiment, the first UE that has established a connection with the second UE tells the second UE the CSI-RS resource, so that the second UE knows the resource location where the first UE sends the CSI-RS. The second UE can directly locate the corresponding resource location to receive the CSI-RS sent by the first UE, without traversing all surrounding UEs to identify the first UE, so that the second UE can quickly identify the first UE that has established a connection with it from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on the first UE.

[0032] In a 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.

[0033] In a possible implementation, 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 at least include the second UE. The power consumption of the first UE can be reduced.

[0034] 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.

[0035] In a 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 indicate that the second UE performs 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 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 at least one CSI-RS resource.

[0036] In this embodiment, the first UE that has established a connection with the second UE tells the second UE the CSI-RS resource, so that the second UE knows the resource location where the first UE sends the CSI-RS. The second UE can directly locate the corresponding resource location to receive the CSI-RS sent by the first UE, without traversing all surrounding UEs to identify the first UE, so that the second UE can quickly identify the first UE that has established a connection with it from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on 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 a fifth aspect, a communication device is provided, wherein the device has the functions of implementing any possible implementation of the first aspect to the fourth aspect and each aspect. These functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more functional modules corresponding to the above functions.

[0039] In a 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, they are 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 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.

[0040] In a possible implementation, the device may further include a transceiver, the transceiver being configured to send a signal processed by the processor, or receive a signal input to the processor. The transceiver may perform a sending action or a receiving action performed 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, perform a sending action or a receiving action performed 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.

[0041] 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 may not be located 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, they are 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 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.

[0042] 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 a signal processed by the processor, or to receive a signal input to the processor. The input / output interface may execute a sending action or a 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 a sending action or a 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 a sending action, and the input interface executes a receiving action.

[0043] In a possible implementation, the chip system may be composed of a chip, or may include a chip and other discrete devices.

[0044] 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.

[0045] 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.

[0046] In the ninth aspect, a computer program product is provided, comprising: a computer program code, wherein when the computer program code runs on a computer, the computer executes the method 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 executes the method 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.

[0047] 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.

[0048] In the eleventh aspect, a communication system is provided, comprising a first UE executing the third aspect and any possible implementation of the third aspect and a second UE executing the fourth aspect and any possible implementation of the fourth aspect.

[0049] The technical effects of the fifth to eleventh aspects mentioned above can refer to the descriptions in the first to fourth aspects, and the repeated parts will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of the architecture of a mobile communication system provided in an embodiment of the present application;

[0051] Figure 2 A schematic diagram of a UE identification process provided in an embodiment of the present application;

[0052] Figure 3aA schematic diagram of the structure of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0053] Figure 3b A schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0054] Figure 3c A schematic diagram of the structure of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0055] Figure 3d A schematic diagram of the structure of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0056] Figure 3e A schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0057] Figure 3f A schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0058] Figure 3g A schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0059] Figure 3h A schematic diagram of the structure of an S-SSB of a PSCCH occupying 2 symbols provided in an embodiment of the present application;

[0060] Figure 3i 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] Figure 3j A schematic diagram of the structure of an S-SSB of a PSCCH occupying 3 symbols provided in an embodiment of the present application;

[0062] Figure 4 A schematic diagram of a UE switching time-frequency resources provided in an embodiment of the present application;

[0063] Figure 5 A schematic diagram of different UEs occupying different time domain resources provided in an embodiment of the present application;

[0064] Figure 6 A schematic diagram of a UE identification process provided in an embodiment of the present application;

[0065] Figure 7 A schematic diagram of a UE identification process provided in an embodiment of the present application;

[0066] Figure 8 It is a structural schematic diagram of S-SSB in the prior art;

[0067] Fig. 9 A schematic diagram of the structure of an S-SSB provided in an embodiment of the present application;

[0068] Fig.10 A schematic diagram of the structure of an S-SSB provided in an embodiment of the present application;

[0069] Fig.11 A schematic diagram of the structure of an S-SSB provided in an embodiment of the present application;

[0070] Fig.12 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0071] Fig.13 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0072] Figure 1 Schematic diagram of the architecture of the communication system used in the embodiment of the present application. Figure 1 As shown, the communication system includes multiple terminals, namely terminal 11 to terminal 17, and the terminals can communicate with each other through sidelinks.

[0073] The 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, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0074] Terminals can communicate with each other through authorized spectrum, unauthorized spectrum, or both; can communicate with each other through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0075] 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.

[0076] 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 in 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 in the embodiments of the present application are also applicable to similar technical problems.

[0077] In frequency range 2 (FR2) (24.25 GHz to 71 GHz), UEs perform beam tracking via the side synchronization signal block S-SSB to ensure communication quality. Figure 1 Taking the terminal 11 and the terminal 14 in as an example, the process of beam tracking is introduced: UE14 uses different beams to send multiple S-SSBs and direct communication requests (direct communication request, DCR) on resource 1, and the direct communication request includes the identifier of the UE14. UE11 receives multiple S-SSBs and DCRs from UE14 based on different beams on resource 1. UE11 selects a reliable beam from the multiple beams of the received S-SSBs based on the signal quality of the multiple S-SSBs, and sends information for 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 domain 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 for establishing an initial beam pair to UE14 based on the spatial domain filter used when receiving the S-SSB that meets the signal quality requirements. The communication connection between UE11 and UE14 is realized through the S-SSB sent by UE14.

[0078] In addition, UE14 periodically sends S-SSB (the time domain resources in resource 1 are periodic). UE14 can use a single beam to send S-SSB or multiple beams to send S-SSB. After UE11 selects a reliable beam from multiple beams for receiving S-SSB, it can periodically detect 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 beams. If the signal quality does not meet the signal quality requirements, it is necessary to reselect a reliable beam.

[0079] When UE11 uses different beams to send multiple S-SSBs on resource 2, UE14 can also monitor the S-SSBs sent by UE11 on resource 2. Similar to UE14, UE11 also needs to use one or more beams to send multiple S-SSBs around, so that UEs connected to UE11 can detect changes in the beam quality of UE11 around. For UE14, there are not only UE11 around, but also UE15 and UE16. UE15 and UE16 will also send 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.

[0080] Based on this, the present application proposes a method for identifying UE so that the originating UE that has established a communication connection through S-SSB can quickly identify the counterpart UE.

[0081] The following is an introduction to the solution provided by the embodiments of the present application in conjunction with the accompanying drawings.

[0082] 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 communications 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 an 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, the time domain resources include the position of the time slot or symbol for sending CSI-RS, the frequency domain resources include the subcarrier position occupied by sending CSI-RS in the frequency domain, and the code domain resources include the sequence used by CSI-RS.

[0083] Figure 2 A schematic diagram of a process of identifying a UE provided in an embodiment of the present application is shown, including the following steps:

[0084] Step 201: A first UE establishes a connection with a second UE.

[0085] In a possible implementation, the first UE establishes a connection with the second UE by monitoring the S-SSB sent by the second UE. Figure 1 UE11 in the example, the second UE is Figure 1 UE14 in.

[0086] In step 201, the time domain resources occupied by the second UE for sending S-SSB include the following examples: In one example, the time domain resources occupied by the second UE for sending S-SSB are one of the N time domain resources configured by the second configuration information for sending S-SSB. In one example, the time domain resources occupied by the second UE for sending S-SSB do not belong to the multiple time domain resources configured by the second configuration information for sending 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 S-SSB are: a time domain resource in the time domain resources outside the resource pool except the multiple time domain resources configured by the second configuration information for sending S-SSB. In one example, the time domain resources occupied by the second UE for sending S-SSB are time domain resources within the resource pool. For the specific contents of these examples of the time domain resources occupied by the second UE for sending S-SSB, please refer to the relevant introduction of Example 1, Example 2 and Example 3 about the first time domain resource below.

[0087] 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 for S-SSB.

[0088] Correspondingly, the second UE receives the first indication information from the first UE.

[0089] The first indication information is carried in a physical sidelink shared channel (PSSCH), a medium access channel control element (MAC-CE), or sidelink control information (SCI).

[0090] Step 203: The first UE sends an S-SSB on the first resource.

[0091] Correspondingly, the second UE receives S-SSB on the first resource.

[0092] The 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.

[0093] The first frequency domain resource may be a specific frequency range. The first time domain resource will be introduced in detail later.

[0094] The following introduces the first code domain resource: When the first UE generates an S-SSB, the identification information of the first UE is one of the parameters that need to be considered. The first UE can carry the identification information of the first UE in the first indication information. The second UE can determine the identification of the first UE based on the first indication information. Furthermore, the second UE can determine the synchronization signal sequence that needs to be detected, that is, the first code domain resource, based on the identification information of the first UE. The second UE can receive the S-SSB based on the first code domain resource.

[0095] In one possible implementation, the first UE generates an S-PSS and / or S-SSS in an S-SSB based on the identification information of the first UE. The second UE determines an S-PSS sequence and / or S-SSS sequence in a first code domain resource based on the identification information of the first UE. In an optional example, the first indication information indicates a first time domain resource and a first code domain resource, so that the second UE can detect the code domain sequence (resource) on the first time domain resource.

[0096] Step 204: The second UE determines the S-SSB received on the first resource as the S-SSB sent by the first UE.

[0097] 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).

[0098] In order 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 cannot receive the S-SSB from the first UE on the first resource.

[0099] In this embodiment, the first UE that has established a connection with the second UE tells the second UE 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, so that the second UE can quickly identify the first UE that has established a connection with it from multiple UEs, and the second UE can quickly perform beam tracking on the first UE.

[0100] In one possible example, in the above Figure 2 On the basis of, the first UE may also 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 first UE sends a signal on at least one CSI-RS resource using the same beam as the first UE sends 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.

[0101] 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 the S-SSB on the first resource, the second UE cannot receive the S-SSB from the first UE on the first resource.

[0102] 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.

[0103] A specific implementation method for the second UE to perform beam tracking or channel measurement on the first UE according to at least one CSI-RS resource configured by the first configuration information is: the first UE sends CSI-RS on 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 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 at least one CSI-RS resource.

[0104] The following introduces several examples in which the first resource is a first time domain resource (it can be understood that the examples of the present application are numbered in no particular order and do not reflect the priority of the examples, but are only for the convenience of description):

[0105] 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.

[0106] 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 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. For example, the transmission period of S-SSB is 160ms.

[0107] In the present application, the second configuration information configures at least 3 time domain resources for sending S-SSB.

[0108] The multiple time domain resources used to send 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, among which the 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, including parameters such as the number of symbols occupied by the control channel in the time slot and the period of the feedback channel.

[0109] 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.

[0110] Example 1.1: 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 second configuration information for sending S-SSB.

[0111] The second UE can use the number to identify which time domain resource among the multiple time domain resources for sending S-SSB configured by the second configuration information that the first UE wants to use as the first time domain resource. The first time domain resource is indicated by the number, and the indication method is simple and clear.

[0112] 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 allocation 1, time allocation 2, and time allocation 3; when 2 bits are 00, it indicates time allocation 1; when 2 bits are 01, it indicates time allocation 2; when 2 bits are 10, it indicates time allocation 3. This application does not restrict which time allocation is specifically represented by different values ​​of 2 bits.

[0113] 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 last time sending S-SSB before sending the S-SSB on the first time domain resource.

[0114] 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.

[0115] For example, the first indication information indicates the order of the first time domain resource in the multiple time domain resources configured by the second configuration information for sending S-SSB except the second time domain resource. The second UE can identify, through the order, which time domain resource other than the second time domain resource in the multiple time domain resources configured by the second configuration information for sending S-SSB that the first UE wants to use as the first time domain resource.

[0116] For example, the configuration information configures three time allocations for sending S-SSB, including: time allocation 1, time allocation 2 and time allocation 3; the first UE occupies time allocation 2 (i.e., the second time domain resource) to send S-SSB. After a period of time, the first UE decides to occupy time allocation 1 (i.e., the first time domain resource) to send S-SSB. The first UE informs the second UE of time allocation 1 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 allocation 2 (i.e., the second time domain resource). The first indication information can occupy 1 bit; when 1 bit is 0, it indicates an earlier time allocation in the remaining time allocations. For example, the order is reflected by numbering, and the earlier the order, the smaller the number, that is, the earlier time allocation is time allocation 1; when 1 bit is 1, it indicates a later time allocation in the remaining time allocations, that is, time allocation 3.

[0117] This example 1.2 can be applicable to the scenario in which 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.

[0118] Example 1.3: The first indication information includes: the number of S-SSBs 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 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.

[0119] Typically, the transmission period of an S-SSB is 160ms.

[0120] The second UE can determine the time slot occupied by the first S-SSB by the offset value of the time slot for initially sending the S-SSB 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 for sending the S-SSBs. 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 for sending S-SSBs 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.

[0121] Example 2: The first time domain resource is: a plurality of time domain resources configured by the second configuration information for sending S-SSB, and the first time domain is outside the resource pool (i.e., a time domain resource that is not a time domain resource in the resource pool). In other words, the first time domain resource is: a time domain resource in the time domain resources outside the resource pool except for the plurality of time domain resources configured by the second configuration information for sending S-SSB.

[0122] For example, the first indication information includes: the number of S-SSBs 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 sending each S-SSB. The first indication information is used to determine the time slot included in the first time domain resource. The first time domain resource is indicated by specific information, and the indication method is flexible.

[0123] Let's introduce an example different from the example {10, 30, 50, 70} in Example 1.3 to avoid mutual influence. The offset value is 20 time slots, the number of S-SSBs sent is 4, and the interval is 20 time slots. Then, the time slots for sending S-SSBs in one cycle are numbered {20, 40, 50, 80} respectively. That is, the first time domain resources include: time slot 20, time slot 40, time slot 60, and time slot 80.

[0124] Example 3: The first time domain resource is in a resource pool (ie, belongs to a time domain resource in a resource pool).

[0125] 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 symbol after the first symbol; the PSCCH is used to indicate / reserve a time slot for sending S-SSB after the current time slot.

[0126] This application does not limit the transmission of the physical sidelink broadcast channel (PSBCH) in S-SSB.

[0127] 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.

[0128] 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.

[0129] 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, the UE sends S-SSB outside the resource pool without considering other data transmissions in the resource pool. This example proposes that the UE sends S-SSB in the resource pool. Considering 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. PSCCH reserves the time slot position for sending S-SSB in the future, so as to achieve 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.

[0130] Several examples of the first UE sending the S-PSS and S-SSS on symbols after the first symbol are described below:

[0131] Example 3.1: The S-PSS is sent on a second symbol that is located after the first symbol and adjacent to the first symbol in the time slot, 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 too many time domain resources.

[0132] In one example, the second symbol includes 2 symbols, and the third symbol includes 2 symbols.

[0133] like Figure 3a As shown, 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, and symbols 8 and thereafter do not send S-PSS and S-SSS.

[0134] like Figure 3b As shown, 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 thereafter do not send S-PSS and S-SSS.

[0135] 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.

[0136] like Figure 3c As shown, 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-SSS.

[0137] like Figure 3d As shown, 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.

[0138] like Figure 3e As shown, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced, where symbol 1 and symbol 2 are used to send PSCCH, symbol 3 and symbol 4 are used to send S-PSS, symbol 5 and symbol 6 are used to send S-SSS, symbol 7 to symbol 10 are repetitions of symbol 3 to symbol 6, and symbol 11 and subsequent symbols do not send S-PSS and S-SSS.

[0139] like Figure 3f As shown, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced, where symbol 1 and symbol 2 are used to send PSCCH, symbol 3 and symbol 4 are used to send S-PSS, symbol 5 and symbol 6 are used to send S-SSS, symbol 7 to symbol 10 are repetitions of symbol 3 to symbol 6, and symbol 11 and symbol 12 send S-PSS.

[0140] like Figure 3g As shown, a possible S-SSB structure of a PSCCH occupying 2 symbols is introduced, where symbol 1 and symbol 2 are used to send PSCCH, symbol 3 and symbol 4 are used to send S-PSS, symbol 5 and symbol 6 are used to send S-SSS, symbol 7 to symbol 10 are repetitions of symbol 3 to symbol 6, and symbol 11 and symbol 12 send S-SSS.

[0141] 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. The S-PSS and S-SSS are transmitted on the symbol after the first symbol in the time slot, including: when the physical sidelink feedback channel PSFCH is configured in the time slot, the S-PSS and S-SSS are transmitted on part or all of the symbols after the first symbol in the time slot and outside the symbols used to transmit PSFCH. That is, in the time slot configured with PSFCH, the symbols used to transmit PSFCH are not used to transmit S-PSS and S-SSS to avoid conflicts with PSFCH.

[0142] Optionally, a 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 middle symbols can be used to send S-PSS and S-SSS. In a time slot, if PSFCH is sent on symbol 12 and symbol 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 other than the symbol used to send PSFCH.

[0143] like Figure 3h As shown, a possible S-SSB structure of PSCCH occupying 2 symbols is introduced, where symbol 1 and symbol 2 are used to send PSCCH, symbol 3 and symbol 4 are used to send S-PSS, symbol 5 and symbol 6 are used to send S-SSS, and symbol 7 and symbol 8 are used to send S-PSS.

[0144] like Figure 3i As shown, a possible S-SSB structure of a 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.

[0145] like Figure 3j As shown, 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, and symbols 8 and 9 are used to send P-SSS.

[0146] 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;

[0147] Solution 1: Still select a 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 using Solution 1 is exactly Example 1 introduced above.

[0148] Solution 2: Select a time domain resource from the time domain resources outside the resource pool, except for the multiple time domain resources configured by the second configuration information for sending S-SSB, as the first time domain resource. The first time domain resource selected by using Solution 2 is exactly Example 2 introduced above. That is to say, Example 2 introduced above can be applied to the scenario where the first UE detects that the multiple time domain resources configured by the second configuration information for sending S-SSB are all occupied by surrounding UEs. Of course, this scenario is just an example and is not a limitation on Example 2.

[0149] Solution 3: Select a first time domain resource from the resource pool. The first time domain resource selected by using Solution 3 is exactly Example 3 introduced above. (ie, Example 3). That is to say, Example 3 introduced above can be applicable to a scenario in which the first UE detects that multiple time domain resources configured by the second configuration information for sending S-SSB are all occupied by surrounding UEs. Of course, this scenario is only an example and is not a limitation of Example 3.

[0150] In one example, the first UE may periodically and cyclically execute scheme 1, that is, at intervals, it selects a time domain resource from multiple time domain resources configured by the second configuration information for sending S-SSB to send S-SSB, instead of occupying a certain time domain resource all the time. If the first UE always occupies a certain time domain resource, when there is a new UE that needs to communicate on the occupied time domain resource, the first UE cannot detect it. By periodically changing the time domain resources, the first UE can ensure that the existing link is accessible to the UE for potential communication when there is no beam failure.

[0151] like Figure 4 As shown, an example of periodically changing time domain resources is introduced.

[0152] 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 the conflict between sending and receiving, the first UE cannot monitor the S-SSB sent by UEc.

[0153] After a period of time, the first UE wants to switch to sending S-SSB on time allocation 1; the first UE sends a first indication message to UEb, indicating time allocation 1. The first UE switches to sending S-SSB on time allocation 1, and the first UE can monitor the S-SSB sent by UEc on time allocation 3, and UEc establishes a connection.

[0154] After a period of time, the first UE wants to switch to time allocation 3 to send S-SSB, and the first UE sends first indication information to UEb and / or UEa respectively, indicating time allocation 3. The first UE switches to time allocation 3 to send S-SSB, and the first UE can monitor the S-SSBs sent by UEs other than those occupying time allocation 3.

[0155] In a possible scenario, in step 202: before the first UE sends the first indication information to the second UE, the first UE sends the 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, and the first UE tells the second UE the switched first time domain resource to avoid the second UE failing to detect the S-SSB on the second time domain resource and considering the beam tracking failure.

[0156] 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 except for 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 about the first time domain resource above, and no further details will be given.

[0157] 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.

[0158] 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.

[0159] 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 according to 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 S-PSS and S-SSS based on the synchronization ID, the S-PSS and S-SSS in the S-SSB sent by any UE contain the synchronization ID corresponding to the GNSS, and the S-SSS or S-PSS is generated based on the synchronization ID. The surrounding UE can determine the synchronization source corresponding to the synchronization ID of the S-SSB with the highest priority as its 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 its own synchronization source.

[0160] Take an example of switching the synchronization source. 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 S-SSB to time allocation 2. The first UE loses synchronization. The first UE searches for a synchronization source 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 S-SSB to time allocation 3. The first UE loses synchronization. The first UE searches for a synchronization source in time allocation 1 and time allocation 2.

[0161] Take an example without switching the synchronization source. 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 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 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.

[0162] 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 to select the first time domain resource for sending the S-SSB (for example, select the first time domain resource from time allocation 1 and time allocation 3), which can avoid frequent switching of the synchronization source.

[0163] In the example of not switching the synchronization source, the first UE switches the first time domain resource for sending S-SSB to time allocation1. Possible reasons why the first UE can still use the synchronization source on time allocation2 as the synchronization source of the first UE are: the priority of the synchronization source on time allocation2 is higher than the priority of the synchronization source on time allocation3; or the priority of the synchronization source on time allocation 2 is the same as the priority of the synchronization source on time allocation3, but the RSRP of the S-SSB detected on time allocation 2 is higher than the RSRP of the S-SSB detected on time allocation3. Similarly, the first UE switches the first time domain resource for sending S-SSB to time allocation3. Possible reasons why the first UE can still use the synchronization source on time allocation2 as the synchronization source of the first UE are: the priority of the synchronization source on time allocation2 is higher than the priority of the synchronization source on time allocation3; or the priority of the synchronization source on time allocation 2 is the same as the priority of the synchronization source on time allocation3, but the RSRP of the S-SSB detected on time allocation 2 is higher than the RSRP of the S-SSB detected on time allocation3.

[0164] 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.

[0165] In a 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-SSB 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 The schematic diagram shows that different UEs occupy 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 an S-SSB, 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-SSB 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 the 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.

[0166] In another possible scenario, the first UE determines, through the monitored S-SSB, that N-1 time domain resources among the N time domain resources configured by the second configuration information for sending S-SSB are occupied by multiple surrounding UEs, and the remaining one time domain resource is occupied by the first UE itself. For example, the first UE monitors the S-SSB 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, so that UEa and UEb can 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 repeated time domain resources can perform beam tracking on the first UE based on the CSI-RS resources.

[0167] Figure 6 A schematic diagram of another process of identifying a UE provided in an embodiment of the present application is shown, and a process of identifying a UE by configuring CSI-RS resources is introduced, including the following steps:

[0168] Step 601: A first UE establishes a connection with a second UE.

[0169] In a possible implementation, the first UE establishes a connection with the second UE by monitoring the S-SSB sent by the second UE. Figure 1 UE11 in the example, the second UE is Figure 1 UE14 in.

[0170] 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.

[0171] Correspondingly, the second UE receives the first configuration information from the first UE.

[0172] 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.

[0173] 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 according to 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 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.

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

[0175] 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.

[0176] Step 602 and step 603 may be performed simultaneously, or step 602 may be performed earlier than step 603 .

[0177] The first configuration information and the second indication information may be carried in the same message or in different messages.

[0178] 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.

[0179] Step 604: After receiving the second indication information, the second UE 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.

[0180] 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.

[0181] The second UE 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. A specific implementation method is: the first UE sends CSI-RS on the at least one CSI-RS resource configured by the first configuration information, and correspondingly, 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.

[0182] The CSI-RS resources in this application indicate 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, the time domain resources include the position of the time slot or symbol for sending CSI-RS, the frequency domain resources include the subcarrier position occupied by sending CSI-RS in the frequency domain, and the code domain resources include the sequence used by 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 according to the CSI-RS resources configured by the first configuration information.

[0183] In this embodiment, the first UE that has established a connection with the second UE configures CSI-RS resources to the second UE, so that the second UE knows the resource location of the CSI-RS sent by the first UE. The second UE can directly locate the corresponding resource location to receive the CSI-RS sent by the first UE, without traversing all surrounding UEs to identify the first UE, so that the second UE can quickly identify the first UE that has established a connection with it from multiple UEs, and the second UE can quickly perform beam tracking or channel measurement on the first UE.

[0184] In the existing technology, the 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, the UE is beam tracked or the channel is measured based on the CSI-RS received on the configured CSI-RS resources, without detecting the S-SSB, which can reduce the power consumption of the UE and will not consider the beam tracking or channel measurement failed due to the failure to detect the S-SSB.

[0185] 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 the S-SSB or may not send the S-SSB.

[0186] 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 (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 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.

[0187] For example, Figure 5 As shown, the second configuration information configures 3 time allocations for sending S-SSB, including: time allocation 1, time allocation 2 and time allocation 3. The first UE detects that UEa sends S-SSB on time allocation 1, UEb sends S-SSB on time allocation 2, and UEc sends S-SSB on time allocation 3, and the first UE has established connections with all three UEs. At this time, no matter which time allocation the first UE chooses to send S-SSB, a transmission and reception conflict will occur, so the first UE does not need to send S-SSB.

[0188] 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.

[0189] 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.

[0190] In the example where the first UE sends an S-SSB, the resources occupied by the S-SSB sent by the first UE may be the same as or different from the resources occupied by the S-SSB sent by the second UE. Figure 6 The process can be applicable to the scenario where the resources occupied by the first UE for sending the S-SSB are the same as the resources occupied by the second UE for sending the S-SSB, and can also be applicable to the scenario where the resources occupied by the first UE for sending the S-SSB and the second UE for sending the S-SSB are different.

[0191] 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 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 an identifier of at least one 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 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.

[0192] Combination Figure 2 and Figure 6 The UE identification process introduced, such as Figure 7 As shown, another possible UE identification method is introduced:

[0193] Step 701: For the first UE, it can monitor the S-SSBs sent by multiple surrounding UEs respectively, and establish connections with the multiple surrounding UEs respectively based on the S-SSBs.

[0194] The first UE wants to send S-SSB on the first resource. Among multiple surrounding UEs, some of the surrounding UEs may also send S-SSB on the first resource, and some of the surrounding UEs may not send S-SSB on the first resource. For the sake of description, the UEs that do not send S-SSB on the first resource are called surrounding UE1, and the UEs that send S-SSB on the first resource are called surrounding UE2. The surrounding UE1 can be one or more UEs, and the surrounding UE2 can be one or more UEs.

[0195] For the surrounding UE1 that does not send S-SSB on the first resource, the first UE and the surrounding UE1 may perform Figure 2 The UE identification process introduced here regards these surrounding UE1 as Figure 2For the surrounding UE2 that sends S-SSB on the first resource, the first UE and these surrounding UE2 can perform Figure 6 The UE identification process introduced here regards these surrounding UE2 as Figure 6 The second UE in the process. That is, the first UE sends the first indication information to the surrounding UE1 to inform the first UE to send S-SSB on the first resource, so that these surrounding UE1 can monitor the S-SSB from the first UE on the first resource. The first UE sends the first configuration information and the second indication information 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 to send S-SSB on the first resource, these surrounding UE2 cannot monitor the S-SSB sent by the first UE on the first resource, so these surrounding UE2 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.

[0196] For the surrounding UE that does not send the S-SSB on the first resource, that is, the surrounding UE1, the following steps are performed:

[0197] 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.

[0198] Correspondingly, the surrounding UE1 receives the first indication information from the first UE.

[0199] The specific process of step 702a refers to the introduction in step 202 and will not be repeated here.

[0200] Step 703a: The first UE sends an S-SSB on the first resource.

[0201] Correspondingly, the surrounding UE1 receives S-SSB on the first resource.

[0202] Step 704a: The surrounding UE1 determines the S-SSB received on the first resource as the S-SSB sent by the first UE.

[0203] For the surrounding UE that sends the S-SSB on the first resource, that is, the surrounding UE2, the following steps are performed:

[0204] Step 702b: the first UE sends first configuration information to surrounding UE2, and correspondingly, the surrounding UE2 receives the first configuration information from the first UE.

[0205] 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 first UE sends a signal on at least one CSI-RS resource using the same beam as the first UE sends 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.

[0206] 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.

[0207] Step 703b: The first UE sends a second indication information to the surrounding UE2, where the second indication information is used to indicate that the first UE is to be beam tracked or the channel measured only according to the at least one CSI-RS resource configured by the first configuration information. In other words: the second indication information is used to indicate that the second UE is to be beam tracked or the channel measured according to the at least one CSI-RS resource configured by the first configuration information, without the need to be beam tracked or the channel measured according to the S-SSB.

[0208] Correspondingly, the surrounding UE2 receives the second indication information from the first UE.

[0209] Step 704b: After receiving the second indication information, the surrounding UE2 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.

[0210] 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.

[0211] A specific implementation method of the surrounding UE2 performing beam tracking or channel measurement on the first UE according to at least one CSI-RS resource configured by the first configuration information is: the first UE sends CSI-RS on 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 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 at least one CSI-RS resource.

[0212] 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, and the channel is the channel between the first UE and the UE receiving the first configuration information.

[0213] The UE that receives the first configuration information sends the channel measurement result corresponding to the at least one CSI-RS resource to the first UE, and correspondingly, the first UE receives the channel measurement result corresponding to the at least one CSI-RS resource.

[0214] 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.

[0215] In an optional example, the first configuration information configures a CSI-RS resource, and the first UE receives a channel measurement result, and the first UE determines the transmission code rate based on the channel measurement result. The transmission code rate is adjusted according to the channel measurement result to achieve better communication.

[0216] like Figure 8 As shown in FIG. 1 , an existing S-SSB structure is introduced. It can be seen that in a time slot, PSBCH is sent on symbol 0, S-PSS is sent on symbol 1 and symbol 2, S-SSS is sent on symbol 3 and symbol 4, and PSBCH is sent on symbol 5 to symbol 12.

[0217] In the prior art, in FR1, S-SSB is only used for UE synchronization, and in FR2, another function of S-SSB is 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 send PSBCH. In other words, S-SSB no longer occupies symbols 5 and after symbol 5. This can reduce transmission overhead and reduce UE transmission power consumption.

[0218] In addition, symbol 0 may still be used to send PSBCH, or may be used to send S-PSS or S-SSS instead.

[0219] See also Fig. 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.

[0220] See also Fig.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.

[0221] See also Fig.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.

[0222] It is understandable 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 execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0223] Fig.12 and Fig.13 Schematic diagram of the structure of possible communication devices provided in the 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 method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be as follows Figure 1One of the UE11 to UE17 shown may also be a module (such as a chip) applied to the second UE or the first UE.

[0224] like Fig.12 As shown, the communication device 1200 includes a processing unit 1210 and a transceiver unit 1220. The communication device 1200 is used to implement the above Figure 2 , Figure 4 , Figure 6 , Figure 7 Functions of the second UE or the first UE in the method embodiment shown in .

[0225] When the communication device 1200 is used to implement Figure 2 The functions of the first UE in the method embodiment shown are: 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.

[0226] When the communication device 1200 is used to implement Figure 2 When the function of the second UE in the method embodiment shown is: 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.

[0227] For a more detailed description of the processing unit 1210 and the transceiver unit 1220, please refer to Figure 2 The relevant description in the method embodiment shown is directly obtained, and no further description is given 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 no further description is given here.

[0228] When the communication device 1200 is used to implement Figure 6 The functions of the first UE in the method embodiment shown are: 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.

[0229] When the communication device 1200 is used to implement Figure 6The functions of the second UE in the method embodiment shown are: 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.

[0230] For a more detailed description of the processing unit 1210 and the transceiver unit 1220, please refer to Figure 6 The relevant description in the method embodiment shown is directly obtained, and no further description is given 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 in the method embodiment, and no further description is given here.

[0231] like Fig.13 As shown, the communication device 1300 includes a processor 1310 and an interface circuit 1320. The processor 1310 and the interface circuit 1320 are coupled to each other. It is understood that the interface circuit 1320 can be a transceiver or an input-output interface. Optionally, the communication device 1300 may also include a memory 1330 for storing instructions executed by the processor 1310 or storing input data required by the processor 1310 to execute instructions or storing data generated after the processor 1310 executes instructions.

[0232] When the communication device 1300 is used to implement Fig.12 When the method is shown, the processor 1310 is used to implement the function of the above-mentioned processing unit 1210, and the interface circuit 1320 is used to implement the function of the above-mentioned transceiver unit 1220.

[0233] When the above communication device is a module applied to the first UE, the first UE module implements the function of the first UE in the above method embodiment. The first UE module receives information from other modules (such as a radio frequency module or an antenna) in the first UE, and the information is sent by the second UE to the first UE; or the first UE module sends information to other modules (such as a radio frequency module or an antenna) in the first UE, and the information is sent by the first UE to the second UE.

[0234] When the above communication device is a chip applied to the second UE, the second UE chip implements the function of the second UE in the above method embodiment. The second UE chip receives information from other modules (such as a radio frequency module or an 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 an antenna) in the second UE, and the information is sent by the second UE to the first UE.

[0235] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or 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.

[0236] 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 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 can write information to the storage medium. Of course, the storage medium can also be a component 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 be present in the first UE or the second UE as discrete components.

[0237] The embodiment of the present application further 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.

[0238] The embodiment of the present application further provides a computer program product, including: a computer program code, when the computer program code is executed on a computer, the computer can execute the UE identification method provided above.

[0239] 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.

[0240] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part 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 instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed 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 instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0241] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0242] In the present application, "at least one" means one or more, and "more than one" 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 the present application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of the present 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.

[0243] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal 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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