Method and apparatus for determining the target UE in a terminal device (UE) to UE relay scenario.

Abstract

[Solution] An embodiment of the present disclosure discloses a method for determining a target UE in a terminal device UE-to-UE relay scenario, the method being executed by a first UE and including the steps of: acquiring sidelink measurements between the first UE and a second UE, the sidelink measurements including a sidelink communication reference signal received power (SL-RSRP) and / or a sidelink discovery reference signal received power (SD-RSRP); determining whether the first UE can serve as a relay UE based on the sidelink measurements between the first UE and the second UE and a predefined threshold; and periodically broadcasting a notification message in response to the first UE being able to serve as a relay UE. By implementing the embodiment of the present disclosure, the first UE can determine whether it can serve as a relay UE and provide a relay function to other UEs based on the acquired sidelink measurements between the first UE and the second UE and the predefined threshold.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and particularly to a method and apparatus for determining a target UE in a terminal device (UE) - to - UE relay scenario.

Background Art

[0002] In related technologies, instead of directly connecting to UE B, terminal device (UE) A can be connected to UE B through the relay of UE C. Here, UE A and UE B are remote UEs, and UE C that provides the relay function is a relay UE, and the connected UEs communicate via unicast through a sidelink. Such an architecture is called U2U (UE to UE) relay. To ensure the smooth progress of U2U relay, UE C needs to determine whether UE A and UE B are target UEs that can use the relay function of UE C.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Embodiments of the present disclosure provide a method and apparatus for determining a target UE in a terminal device (UE) - to - UE relay scenario, which can be used in fields such as telematics such as vehicle - to - everything (V2X) communication, long - term evolution - vehicle (LTE - V) for vehicle - to - vehicle communication, vehicle - to - vehicle (V2V) communication, or fields such as smart driving and smart - interconnected vehicles. A relay UE can determine whether another UE can be a target UE in a UE - to - UE relay scenario.

[0004] According to a first aspect, an embodiment of the present disclosure provides a method for determining a target UE in a terminal device (UE) to UE relay scenario, the method being performed by a first UE, the method comprising the steps of: measuring the signal strength between the first UE and a second UE; and determining that the second UE whose signal strength satisfies a first condition can be the target UE.

[0005] In this proposed technology, the first UE can determine whether the second UE can be the target UE based on the signal strength between it and the second UE, thus solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0006] In one implementation, the signal intensity satisfying the first condition includes the signal intensity satisfying the requirement of a first threshold, or the signal intensity continuing to satisfy the requirement of the first threshold for a first time length.

[0007] In one selectable implementation, the first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold, or the first threshold includes the minimum threshold and the maximum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold.

[0008] In this proposed technology, the first UE can determine whether the second UE can be the target UE based on the signal strength, first threshold, and first time length between it and the second UE, thus solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0009] In one selectable implementation, the method further includes the step of determining the first threshold and / or the first time length based on the second UE.

[0010] The step of selectively determining the first threshold and / or the first time length based on the second UE includes the step of receiving the first threshold and / or the first time length transmitted from the second UE.

[0011] The step of selectively determining the first threshold and / or the first time length based on the second UE includes the steps of determining a correspondence between the threshold and / or time length and a service, receiving service instruction information transmitted from the second UE, and determining the first threshold and / or the first time length based on the service instruction information and the correspondence.

[0012] Selectively, the correspondence between the threshold and / or time duration and the service is provided by at least one of the network-side device, the upper layer, and the application layer.

[0013] In one implementation, the method further includes the step of including (carrying) the identification information of the target UE and / or the measurement results of the target UE in the discovery signal.

[0014] In this proposed technology, after the first UE determines that the second UE can be the target UE, the target UE can use the relay function of the first UE based on the discovery signal by including the target UE's identification information and / or measurement results in the discovery signal.

[0015] In one selectable implementation, the measurement result is intensity indication information, and the method further includes the steps of: comparing the signal intensity between the first UE and the target UE with a second threshold; and determining the intensity indication information of the target UE based on the comparison result between the signal intensity between the first UE and the target UE and the second threshold.

[0016] The step of selectively including the identification information of the target UE in the discovery signal includes the step of including the identification information of the target UE in a corresponding list in the discovery signal according to the intensity indication information of the target UE.

[0017] Selectively, the second threshold is provided by at least one of the network-side device, the upper layer, the application layer, and the target UE.

[0018] According to a second aspect, embodiments of the present disclosure provide a method for determining a target UE in a terminal device (UE)-to-UE relay scenario, the method being performed by a second UE, the method including the step of transmitting first information to the first UE for determining whether the second UE can be a target UE.

[0019] In one implementation, the first information includes at least one of a first threshold, a first time length, and service instruction information for determining the first threshold and / or the first time length.

[0020] In one selectable implementation, the first information further includes a second threshold for determining the intensity indication information of the target UE.

[0021] According to a third aspect, an embodiment of the present disclosure provides a method for determining a target UE in a terminal device (UE) to UE relay scenario, the method being performed by a network-side device, the method comprising the steps of transmitting second information to a first UE for determining a first threshold and / or first time length, wherein the first threshold and / or first time length is for determining whether a second UE can be a target UE, wherein the second UE is a neighboring UE of the first UE.

[0022] In one implementation, the second information includes at least one of a threshold and the correspondence between the threshold and a service, and a time length and the correspondence between the time length and a service.

[0023] According to a fourth aspect, embodiments of the present disclosure provide a communication device comprising some or all of the functions of a terminal device that implements the method described in the first aspect, for example, the functions of the communication device may comprise some or all of the functions in some or all embodiments of the present disclosure, or they may comprise functions that implement any one embodiment of the present disclosure independently. The functions can be implemented by hardware, which can also be implemented by the hardware running corresponding software. The hardware or software comprises one or more units or modules that correspond to the functions described above.

[0024] In one implementation, the structure of the communication device may include a transmit / receive module and a processing module, the processing module being configured to support the communication device in performing the corresponding functions of the above method. The transmit / receive module supports communication between the communication device and other devices. The communication device may further include a storage module, which is used to connect the transmit / receive module and the processing module, and which stores the computer programs and data required for the communication device.

[0025] For example, the processing module may be a processor, the transmitting / receiving module may be a transceiver or a communication interface, and the storage module may be memory.

[0026] According to a fifth aspect, an embodiment of the present disclosure provides a communication device comprising some or all of the functions of a terminal device that implements the method described in the second aspect, for example, the functions of the communication device may comprise some or all of the functions in some or all embodiments of the present disclosure, or they may comprise functions that implement any one embodiment of the present disclosure independently. The functions can be implemented by hardware, which can also be implemented by the hardware running corresponding software. The hardware or software comprises one or more units or modules that correspond to the functions.

[0027] In one implementation, the structure of the communication device may include a transceiver module and a processing module. The processing module is configured to support the communication device in executing the corresponding functions of the above method. The transceiver module supports communication between the communication device and other devices. The communication device may further include a storage module. The storage module is used for the connection between the transceiver module and the processing module and stores the computer programs and data required by the communication device.

[0028] As an example, the processing module may be a processor, the transceiver module may be a transceiver or a communication interface, and the storage module may be a memory.

[0029] According to the sixth aspect, an embodiment of the present disclosure provides a communication device, and the communication device realizes the method described in the above third aspect. Network side It has some or all of the functions of the device. For example, the functions of the communication device may include some or all of the functions in the embodiments of the present disclosure, or may have the function of implementing any one embodiment of the present disclosure alone. The functions can be realized by hardware, or can also be realized by hardware executing the corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0030] In one implementation, the structure of the communication device may include a transceiver module and a processing module. The processing module is configured to support the communication device in executing the corresponding functions of the above method. The transceiver module supports communication between the communication device and other devices. The communication device may further include a storage module. The storage module is used for the connection between the transceiver module and the processing module and stores the computer programs and data required by the communication device.

[0031] For example, the processing module may be a processor, the transmitting / receiving module may be a transceiver or a communication interface, and the storage module may be memory.

[0032] According to the seventh aspect, an embodiment of the present disclosure provides a communication device comprising a processor, the processor performing the method described in the first aspect when calling a computer program in memory.

[0033] According to the eighth aspect, an embodiment of the present disclosure provides a communication device which includes a processor which performs the method described in the second aspect when calling a computer program in memory.

[0034] According to the ninth aspect, an embodiment of the present disclosure provides a communication device including a processor, the processor performing the method described in the third aspect when calling a computer program in memory.

[0035] According to the tenth aspect, an embodiment of the present disclosure provides a communication device comprising a processor and a memory, the memory storing a computer program, and the processor causing the communication device to perform the method described in the first aspect by executing the computer program stored in the memory.

[0036] According to the eleventh aspect, an embodiment of the present disclosure provides a communication device comprising a processor and a memory, the memory storing a computer program, and the processor causing the communication device to perform the method described in the second aspect above by executing the computer program stored in the memory.

[0037] According to the twelfth aspect, an embodiment of the present disclosure provides a communication device comprising a processor and a memory, the memory storing a computer program, and the processor causing the communication device to perform the method described in the third aspect above by executing the computer program stored in the memory.

[0038] According to the 13th aspect, an embodiment of the present disclosure provides a communication device comprising a processor and an interface circuit, the interface circuit receiving and transmitting code instructions to the processor, the processor executing the code instructions to cause the device to perform the method described in the first aspect.

[0039] According to the fourteenth aspect, an embodiment of the present disclosure provides a communication device comprising a processor and an interface circuit, the interface circuit receiving and transmitting code instructions to the processor, the processor executing the code instructions to cause the device to perform the method described in the second aspect above.

[0040] According to the 15th aspect, an embodiment of the present disclosure provides a communication device comprising a processor and an interface circuit, the interface circuit receiving and transmitting code instructions to the processor, the processor executing the code instructions to cause the device to perform the method described in the third aspect above.

[0041] According to the 16th aspect, an embodiment of the present disclosure provides a target UE determination system in a terminal device (UE) to UE relay scenario, the system comprising the communication device described in the 4th aspect, the 5th aspect, and the 6th aspect, or the system comprising the communication device described in the 7th aspect, the 8th aspect, and the 9th aspect, or the system comprising the communication device described in the 10th aspect, the 11th aspect, and the 12th aspect, or the system comprising the communication device described in the 13th aspect, the 14th aspect, and the 15th aspect.

[0042] According to the 17th aspect, an embodiment of the present invention provides a computer-readable storage medium for storing instructions used in the above-mentioned terminal device, and when the instructions are executed, causes the terminal device to perform the method described in the first aspect.

[0043] According to the 18th aspect, the embodiments of the present invention are as described above. terminal A readable storage medium is provided to store instructions used for the device, and when such instructions are executed, terminal The device is made to perform the method described in the second embodiment above.

[0044] According to the 19th aspect, an embodiment of the present invention provides a readable storage medium for storing instructions used in the network-side device, and when the instructions are executed, causes the network-side device to perform the method described in the third aspect.

[0045] According to the 20th aspect, the disclosure further provides a computer program product, which includes a computer program, and which, when executed on a computer, causes the computer to perform the method described in the first aspect above.

[0046] According to the 21st aspect, the Disclosure further provides a computer program product, which, when executed on a computer, causes the computer to perform the method described in the second aspect above.

[0047] According to the 22nd aspect, the disclosure further provides a computer program product, which, when executed on a computer, causes the computer to perform the method described in the third aspect above.

[0048] According to the 23rd aspect, the Disclosure provides a chip system which includes at least one processor and interface to support a terminal device in realizing a function according to the first aspect, such as determining or processing at least one of the data and information relating to the above method. In one possible design, the chip system further includes memory which stores computer programs and data required by the terminal device. The chip system may consist of a chip, or it may include a chip and other discrete devices.

[0049] According to the 24th aspect, the present disclosure provides a chip system, which is terminal The chip system includes at least one processor and interface to support the device in realizing a function according to a second embodiment, such as determining or processing at least one of the data and information relating to the above method. In one possible design, the chip system further includes memory, which stores computer programs and data required by the terminal device. The chip system may consist of a chip, or it may include a chip and other discrete devices.

[0050] According to aspect 25, the Disclosure provides a chip system which includes at least one processor and interface to support a network-side device in realizing a function according to a second aspect, such as determining or processing at least one of the data and information relating to the above method. In one possible design, the chip system further includes memory which stores computer programs and data required by a terminal device. The chip system may consist of a chip, or it may include a chip and other discrete devices.

[0051] According to the 26th aspect, the Disclosure provides a computer program which, when executed on a computer, causes the computer to perform the method described in the first aspect above.

[0052] According to aspect 27, the Disclosure provides a computer program which, when executed on a computer, causes the computer to perform the method described in aspect 2 above.

[0053] According to the 28th aspect, the Disclosure provides a computer program which, when executed on a computer, causes the computer to perform the method described in the third aspect above. [Brief explanation of the drawing]

[0054] To more clearly illustrate the technical concepts in the embodiments or background art of this disclosure, the drawings necessary for use in the embodiments or background art of this disclosure are described below. [Figure 1] This is a schematic diagram of the architecture of the communication system provided by the embodiments of this disclosure. [Figure 2] This is a schematic flowchart of the method for determining the target UE in a terminal device (UE) to UE relay scenario provided by the embodiments of this disclosure. [Figure 3] This is a schematic flowchart of a method for determining the target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure. [Figure 4] This is a schematic flowchart of a method for determining the target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure. [Figure 5] This is a schematic flowchart of a method for determining the target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure. [Figure 6] This is a schematic flowchart of a method for determining the target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure. [Figure 7] This is a schematic diagram of a communication device provided by the embodiments of this disclosure. [Figure 8]This is a schematic diagram of another communication device provided by the embodiments of the present disclosure. [Figure 9] This is a schematic diagram of the chip provided by the embodiments of this disclosure. [Modes for carrying out the invention]

[0055] The embodiments of the present disclosure will be described in detail below, examples of which are shown in the accompanying drawings, where the same or similar reference numerals from beginning to end indicate the same or similar elements or elements having the same or similar function. The embodiments described below with reference to the accompanying drawings are for illustrative purposes only and should not be understood as limitations to the present disclosure. In the description of the present disclosure, unless otherwise stated, " / " means "or", for example, the notation A / B may mean A or B, and the "and / or" in this specification is solely for the purpose of describing the relationship between related objects, indicating that three relationships are possible. For example, the notation A and / or B may mean that A exists alone, A and B exist together, or B exists alone.

[0056] To better understand the method for determining the target UE in the terminal device (UE)-to-UE relay scenario disclosed in the embodiments of this application, the communication system applied in the embodiments of this disclosure will be described below.

[0057] Referring to Figure 1, Figure 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure. The communication system may include, but is not limited to, one first terminal device, one second terminal device, and one network-side device. The number and form of devices shown in Figure 1 are for illustrative purposes only and do not constitute a limitation of the embodiments of the present application. In actual applications, two or more first terminal devices, two or more second terminal devices, and two or more network-side devices may be included. For example, the communication system shown in Figure 1 includes one first terminal device 101, one second terminal device 102, and one network-side device 103.

[0058] Furthermore, the technical concepts of the embodiments described herein are applicable to various communication systems, such as long-term evolution (LTE) systems, fifth-generation (5G) mobile communication systems, 5G new radio (NR) systems, or other future new mobile communication systems.

[0059] In the embodiments of this disclosure, the network-side device 103 is a network-side entity for transmitting or receiving signals. For example, a network-side device 103This could include evolved NodeBs (eNBs), transmission reception points (TRPs), next-generation NodeBs (gNBs) in NR systems, base stations in other future mobile communication systems, or access nodes in wireless fidelity (WiFi) systems. The embodiments of this disclosure do not limit the specific technologies and device forms employed by the network-side devices. The network-side devices provided by the embodiments of this disclosure may consist of a central unit (CU) and a distributed unit (DU), where the CU is also called a control unit, and a CU-DU structure can be adopted to separate the protocol layer of the network-side device, such as a base station, with some protocol layer functions centrally controlled by the CU and some or all of the remaining protocol layer functions distributed to the DU, with the CU centrally controlling the DU.

[0060] In the embodiments of this disclosure, the first terminal device 101 and the second terminal device 102 are user-side entities for receiving or transmitting signals, such as those from a mobile phone. Terminal devices can also be called terminals, user equipment (UE), mobile stations (MS), mobile terminal devices (MT), etc. Terminal devices may include automobiles with communication functions, smart cars, mobile phones, wearable devices, tablets (Pads), personal computers with wireless transmission and reception functions, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminal devices for industrial control, wireless terminal devices for self-driving, wireless terminal devices for remote medical surgery, wireless terminal devices for smart grids, wireless terminal devices for transportation safety, wireless terminal devices for smart cities, wireless terminal devices for smart homes, etc. The embodiments of this disclosure do not limit the specific technologies or device configurations employed by terminal devices. The communication systems described in the embodiments of this disclosure are provided to more clearly illustrate the technical proposals of the embodiments and do not constitute limitations on the technical proposals provided by the embodiments of this disclosure. Those skilled in the art will understand that, as system architectures evolve and new traffic scenarios emerge, the technical proposals provided by the embodiments of this disclosure will be similarly applicable to similar problems.

[0061] The method and apparatus for determining the target UE in a terminal device (UE)-to-UE relay scenario provided by this disclosure will be described in detail below, along with the drawings.

[0062] Referring to Figure 2, Figure 2 is a schematic flowchart of a method for determining a target UE in a terminal device (UE) to UE relay scenario provided by an embodiment of the present disclosure. The method is performed by a first UE. As shown in Figure 2, the method may include, but is not limited to, the following steps:

[0063] Step S201: Measure the signal strength between the first UE and the second UE.

[0064] In the embodiments of this disclosure, the signal strength may be SD-RSRP (sidelink discovery reference signal receiving power) or SL-RSRP (sidelink reference signal receiving power), where SD-RSRP is the RSRP of the discovery signal transmitted from the sidelink 2UE, and SL-RSRP is the RSRP of the communication signal between the 2UE and the sidelink.

[0065] For example, when the first UE receives a discovery signal from the second UE, the first UE measures the SD-RSRP between itself and the second UE.

[0066] As another example, if the first UE has already established a sidelink unicast connection with the second UE, the first UE measures the SL-RSRP between itself and the second UE.

[0067] In the embodiments of this disclosure, the first UE is a relay UE in a UE-to-UE relay scenario, and the second UE is a remote UE in a UE-to-UE relay scenario.

[0068] Step S202: It is determined that the second UE whose signal strength satisfies the first condition can be the target UE.

[0069] Selectively, in a terminal device (UE) to UE relay scenario, a first UE may transmit a discovery signal containing the sidelink identifier (carry) of a target UE capable of establishing a sidelink connection with the first UE. After receiving the discovery signal transmitted from the first UE, the second UE may determine, based on the sidelink identifier contained therein, whether it is a target UE capable of establishing a sidelink connection with the first UE, and whether to engage in UE-to-UE relay communication with the first UE.

[0070] Selectively, the first UE can determine that the second UE whose signal strength satisfies the first condition can be the target UE, that is, the first UE can determine that the second UE whose signal strength satisfies the first condition can be the target UE on which a sidelink connection can be established.

[0071] In some implementations of this disclosure, a second UE whose signal strength satisfies a first condition is determined as a target UE that can perform relay communication via the relay function of the first UE, and by establishing a sidelink link with the second UE, the second UE can be made to communicate using the relay function of the first UE.

[0072] In some other implementations of this disclosure, a second UE whose signal strength satisfies a first condition can be determined as a candidate target UE that can perform relay communication via the relay function of the first UE. If the second UE needs to perform relay communication via the first UE, a sidelink link can be directly established with the second UE.

[0073] By implementing the embodiments of this disclosure, the first UE can determine whether the second UE can be a target UE based on the signal strength between it and the second UE, thereby solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0074] In some embodiments of the present disclosure, the satisfaction of a first condition by the signal intensity may include the signal intensity satisfying the requirement of a first threshold, or the signal intensity continuing to satisfy the requirement of the first threshold for a first time length. Optionally, referring to Figure 3, Figure 3 is a schematic flowchart of a method for determining a target UE in a terminal device (UE)-to-UE relay scenario provided by embodiments of the present disclosure. The method is performed by a first UE. As shown in Figure 3, the method may include, but is not limited to, the following steps:

[0075] Step S301: Measure the signal strength between the first UE and the second UE.

[0076] In the embodiments of this disclosure, step S301 can be implemented using any of the embodiments of this disclosure, and is not limited to the embodiments of this disclosure, nor is it described further. For example, the signal strength between the first UE and the second UE can be measured as in step 201, and further details are omitted.

[0077] Step S302: It is determined that a second UE can be the target UE if its signal strength meets the requirements of the first threshold, or if its signal strength continues to meet the requirements of the first threshold for a first time length.

[0078] For example, a second UE can be designated as a target UE if its signal strength between it and the first UE satisfies the requirement of a first threshold (e.g., is equal to or greater than the first threshold).

[0079] As another example, a second UE can be determined to be a target UE if the time duration for which the signal strength between it and the first UE satisfies the requirement of the first threshold is equal to or greater than the first time duration.

[0080] In one selectable implementation, the first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold, or the first threshold includes a minimum threshold and a maximum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold.

[0081] As an example, assuming that the first threshold is the minimum threshold, a second UE whose signal strength between it and the first UE is equal to or greater than the first threshold can be determined to be the target UE.

[0082] As another example, assuming that the first threshold is the minimum threshold, a second UE can be determined to be the target UE if the duration of the signal intensity between it and the first UE is greater than or equal to the first threshold and is greater than or equal to the first time length.

[0083] As another example, if the first threshold includes both a minimum and maximum threshold, then a second UE whose signal intensity between it and the first UE is greater than or equal to the minimum threshold and less than or equal to the maximum threshold can be determined to be the target UE.

[0084] As another example, if the first threshold includes a minimum threshold and a maximum threshold, then the signal intensity between the first UE is lowest A second UE whose duration is above the threshold and below the highest threshold, and whose duration is greater than or equal to the first duration, is determined to be the target UE.

[0085] By implementing the embodiments of this disclosure, the first UE can determine whether the second UE can be a target UE based on the signal strength, first threshold, and first time length between it and the second UE, thereby solving the problem in UE-to-UE relay scenarios where a relay UE cannot determine the target UE.

[0086] In some embodiments of the present disclosure, the method for determining the target UE in the above terminal device (UE)-to-UE relay scenario may further include the step of determining a first threshold and / or first time length based on a second UE.

[0087] For example, the first UE determines the first threshold based on the information transmitted from the second UE.

[0088] As another example, the first UE determines the first time length based on information transmitted from the second UE.

[0089] As another example, the first UE determines the first threshold and the first time length based on the information transmitted from the second UE.

[0090] In one selectable implementation, the step of determining a first threshold and / or first time length based on the second UE described above may include the steps of determining a correspondence between the threshold and / or time length and a service, receiving service instruction information transmitted from the second UE, and determining a first threshold and / or first time length based on the service instruction information and the correspondence.

[0091] As an example, taking the determination of the first threshold based on the second UE as an example, different thresholds corresponding to different service information are set in advance to obtain a correspondence between different service information and different thresholds. After the first UE receives service instruction information transmitted from the second UE, it determines the service information instructed by the service instruction information, and based on the service information and the above correspondence, it determines the threshold corresponding to the service information and determines the threshold corresponding to the service information as the first threshold.

[0092] As another example, taking the determination of the first time length based on the second UE as an example, different time lengths corresponding to different service information are set in advance to obtain a correspondence between different service information and different time lengths. After the first UE receives service instruction information transmitted from the second UE, it determines the service information instructed by the service instruction information, and based on the service information and the above correspondence, it determines the time length corresponding to the service information and sets the time length corresponding to the service information as the first time length.

[0093] As another example, taking the determination of the first threshold and first time length based on the second UE as an example, different thresholds corresponding to different service information are set in advance to obtain a correspondence between different service information and different thresholds, different time lengths corresponding to different service information are set in advance to obtain a correspondence between different service information and different time lengths, the service information corresponding to different thresholds and the service information corresponding to different time lengths are different, the first UE receives service instruction information for indicating the first threshold and service instruction information for indicating the first time length transmitted from the second UE, and determines the corresponding threshold and time length based on the above service information and the above correspondence, determining the threshold corresponding to the above service information as the first threshold, and determining the time length corresponding to the above service information as the first time length.

[0094] As another example, thresholds and time lengths are pre-set for various types of service information, with different thresholds and time lengths corresponding to different service information. This provides a correspondence between different service information and different thresholds and time lengths. The first UE receives service instruction information transmitted from the second UE, determines the service information instructed by the service instruction information, and determines the threshold and time length corresponding to the service information based on the service information and the above correspondence. The threshold corresponding to the service information is determined as the first threshold, and the time length corresponding to the service information is determined as the first time length.

[0095] In the embodiments of this disclosure, the service instruction information may be an RSC (relay service code).

[0096] Selectively, the correspondence between the above thresholds and / or time lengths and services may be provided by at least one of the network-side devices, the upper layer, and the application layer.

[0097] In one embodiment of the embodiments of the present disclosure, the first UE may, after determining that it can be a target UE, transmit a discovery signal containing identification information of the target UE and / or measurement results of the target UE. Referring to Figure 4 as an example, Figure 4 is a schematic flowchart of a method for determining a target UE in another terminal device (UE)-to-UE relay scenario provided by embodiments of the present disclosure. The method is performed by the first UE. As shown in Figure 4, the method may include, but is not limited to, the following steps:

[0098] Step S401: Measure the signal strength between the first UE and the second UE.

[0099] In the embodiments of this disclosure, step S401 can be implemented using any of the embodiments of this disclosure, and is not limited to the embodiments of this disclosure, nor is it described further. For example, the signal strength between the first UE and the second UE can be measured as in step 201, and further details are omitted.

[0100] Step S402: It is determined that the second UE whose signal strength satisfies the first condition can be the target UE.

[0101] In the embodiments of this disclosure, step S402 can be implemented using any of the embodiments of this disclosure, and is not limited to the embodiments of this disclosure, nor is it described in detail.

[0102] Step S403: The discovery signal includes identification information of the target UE and / or measurement results of the target UE.

[0103] Here, the identification information may include the sidelink identifier of a target UE capable of establishing a sidelink connection with the first UE. If the discovery signal contains the identification information, after receiving the discovery signal of the relay UE, the remote UE determines, based on the UE identifier contained therein, whether or not it is the target UE, and then decides whether or not to perform UE-to-UE relay communication with the first UE as the relay UE.

[0104] For example, the first UE includes the identification information of the target UE in the discovery signal that is transmitted.

[0105] As another example, the first UE includes the measurement results of the target UE in the discovery signal that is transmitted.

[0106] As another example, the first UE includes the identification information of the target UE and the measurement results of the target UE in the discovery signal that is transmitted.

[0107] In one selectable embodiment of the embodiments of the present disclosure, the above measurement result is intensity indication information, and the above method may further include the steps of: comparing the signal intensity between a first UE and a target UE with a second threshold; and determining the intensity indication information of the target UE based on the comparison result between the signal intensity between the first UE and the target UE and the second threshold.

[0108] For example, the first UE compares the signal strength between itself and the target UE with a second threshold to obtain a comparison result. In response to the comparison result indicating that the signal strength between itself and the target UE is greater than or equal to the second threshold, it determines that the strength indication information for the target UE is strong indication information. Alternatively, in response to the comparison result indicating that the signal strength between itself and the target UE is less than the second threshold, it determines that the strength indication information for the target UE is weak indication information.

[0109] The step of selectively including the identification information of the target UE in the discovery signal may include the step of including the identification information of the target UE in a corresponding list in the discovery signal, according to the intensity indication information of the target UE.

[0110] For example, different lists corresponding to different intensity instruction information are set up in advance, and based on the acquired intensity instruction information of the target UE, the list corresponding to the intensity instruction information of the target UE is determined, and the identification information of the target UE is included in the list corresponding to the intensity instruction information of the target UE.

[0111] Selectively, the second threshold described above may be provided by at least one of the network-side devices, higher layers, application layers, and target UEs.

[0112] By implementing the embodiments of this disclosure, after the first UE has determined that the second UE can be the target UE, the target UE can use the relay function of the first UE based on the discovery signal by including the identification information of the target UE and / or the measurement results of the target UE in the discovery signal.

[0113] The above embodiment is an embodiment that explains the method for determining the target UE in a terminal device (UE) to UE relay scenario according to the embodiment of this disclosure, starting from the first UE. The embodiment of this disclosure further provides a method for determining the target UE in a terminal device (UE) to UE relay scenario, and the implementation form of the method for determining the target UE in a terminal device (UE) to UE relay scenario will be described below starting from the second UE.

[0114] Referring to Figure 5, Figure 5 shows a method for determining a target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure, the method being performed by a second UE, and as shown in Figure 5, the method may include, but is not limited to, the following steps.

[0115] Step S501: Send the first information to the first UE.

[0116] In the embodiments of this disclosure, the first information is used to determine whether the second UE can be a target UE.

[0117] For example, the second UE transmits first information to the first UE to determine whether or not the second UE can be designated as a target UE.

[0118] In one implementation, the first information includes at least one of a first threshold, a first time length, and service instruction information for determining the first threshold and / or the first time length.

[0119] As an example, the service instruction information is used by the first UE to determine a first threshold based on the service instruction information.

[0120] As another example, the service instruction information is for the first UE to determine the length of one hour based on the service instruction information.

[0121] As another example, the service instruction information is used by the first UE to determine a first threshold and a first time length based on the service instruction information.

[0122] In one selectable implementation, the first information further includes a second threshold for determining the intensity indication information of the target UE.

[0123] For example, the second UE transmits first information, including a second threshold, to the first UE, enabling the first UE to determine the strength indication information of the second UE based on the second threshold.

[0124] By implementing the embodiments of this disclosure, the second UE transmits the first information to the first UE, enabling the first UE to determine whether the second UE can be the target UE based on the specific information in the first information, thereby resolving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE. In one implementation, the embodiment shown in Figure 5 is implemented together with any of the embodiments in Figures 2, 3, or 4; that is, the target UE is determined by any of the embodiments in Figures 2, 3, or 4, and the embodiment shown in Figure 5 allows the second UE to transmit the first information to the first UE to notify the first UE whether or not the second UE can be the target UE.

[0125] The above embodiments describe the method for determining the target UE in a terminal device (UE)-to-UE relay scenario according to the embodiments of this disclosure, from the perspective of the first UE and the second UE. The embodiments of this disclosure further provide a method for determining the target UE in a terminal device (UE)-to-UE relay scenario, and the implementation form of the method for determining the target UE in a terminal device (UE)-to-UE relay scenario will be described below from the perspective of the network-side device.

[0126] Referring to Figure 6, Figure 6 shows a method for determining a target UE in another terminal device (UE)-to-UE relay scenario provided by an embodiment of the present disclosure, the method being performed by a network-side device, and as shown in Figure 6, the method may include, but is not limited to, the following steps.

[0127] Step S601: Send the second information to the first UE.

[0128] Here, the second piece of information is used to determine the first threshold and / or the first time length, and the first threshold and / or the first time length is used to determine whether the second UE can be the target UE.

[0129] For example, a network-side device transmits second information to the first UE to determine a first threshold, which the first UE uses to determine whether the second UE can be a target UE.

[0130] As another example, a network-side device transmits second information to the first UE to determine a first time length, which the first time length is used to determine whether the second UE can be a target UE.

[0131] As another example, a network-side device transmits second information to the first UE for determining a first threshold and a first time length, which the first threshold and first time length are used by the first UE to determine whether the second UE can be a target UE.

[0132] Here, the second UE is the adjacent UE to the first UE.

[0133] In one implementation, the second information includes at least one of the following: a threshold and the correspondence between the threshold and a service, and a time length and the correspondence between the time length and a service.

[0134] By implementing the embodiments of this disclosure, the network-side device transmits instruction information to the first UE, enabling the first UE to determine, based on the second information, whether the second UE can be the target UE, thereby resolving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0135] Referring to Figure 7, Figure 7 is a schematic diagram of a communication device 70 provided by an embodiment of the present disclosure. The communication device 70 shown in Figure 7 may include a transceiver module 701 and a processing module 702. The transceiver module 701 may include a transmit module and / or a receive module, the transmit module being used to implement a transmit function and the receive module being used to implement a receive function, and the transceiver module 701 may implement a transmit function and / or a receive function.

[0136] The communication device 70 may be the first UE, a device within the first UE, or a device that can be matched with and used by the first UE. The communication device 70 may be the second UE, a device within the second UE, or a device that can be matched with and used by the second UE. Alternatively, the communication device 70 may be a network-side device, a device within a network-side device, or a device that can be matched with and used by a network device.

[0137] If the communication device 70 is the first UE, the processing module 702 measures the signal strength between the first UE and the second UE and determines that the second UE, whose signal strength satisfies the first condition, can be the target UE.

[0138] According to the apparatus of the embodiment of this disclosure, the first UE can determine whether the second UE can be the target UE based on the signal strength between it and the second UE, thus solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0139] In one implementation, the signal intensity satisfying the first condition includes the signal intensity satisfying the requirement of the first threshold, or the signal intensity continuing to satisfy the requirement of the first threshold for a first time length.

[0140] In one selectable implementation, the first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold, or the first threshold includes a minimum threshold and a maximum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold.

[0141] In one selectable implementation, the transmit / receive module 701 determines a first threshold and / or first time length based on the second UE.

[0142] Selectively, the transmit / receive module 701 receives, specifically, a first threshold and / or first time length transmitted from the second UE.

[0143] Selectively, the processing module 702 specifically determines the correspondence between a threshold and / or time length and a service, the transmitting / receiving module 701 specifically receives service instruction information transmitted from the second UE, and the processing module 702 further determines a first threshold and / or first time length based on the service instruction information and the correspondence.

[0144] Selectively, the correspondence between thresholds and / or time lengths and services is provided by at least one of the network-side devices, the upper layer, and the application layer.

[0145] In one implementation, the transmit / receive module 701 specifically includes identification information of the target UE and / or measurement results of the target UE in the discovery signal.

[0146] Selectively, the measurement result is strength indication information, and the processing module 702 further compares the signal strength between the first UE and the target UE with the second threshold, and determines the strength indication information for the target UE based on the comparison result between the signal strength between the first UE and the target UE and the second threshold.

[0147] Selectively, the transmit / receive module 701 specifically includes the identification information of the target UE in the corresponding list in the discovery signal, according to the strength indication information of the target UE.

[0148] Selectively, the second threshold may be provided by at least one of the network-side devices, higher layers, application layers, and target UEs.

[0149] If the communication device 70 is the second UE, the transmitting / receiving module 701 transmits first information to the first UE to determine whether or not the second UE can be the target UE.

[0150] In one implementation, the first information includes at least one of a first threshold, a first time length, and service instruction information for determining the first threshold and / or the first time length.

[0151] In one selectable implementation, the first information further includes a second threshold for determining the intensity indication information of the target UE.

[0152] According to the apparatus of the embodiment of this disclosure, the second UE transmits first information to the first UE, enabling the first UE to determine whether the second UE can be the target UE based on the specific information in the first information, thereby solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0153] If the communication device 70 is a network-side device, the transmitting / receiving module 701 transmits second information to the first UE for determining a first threshold and / or first time length, where the first threshold and / or first time length is for determining whether the second UE can be a target UE, where the second UE is a neighboring UE of the first UE.

[0154] In one implementation, the second information includes at least one of the following: a threshold and the correspondence between the threshold and a service, and a time length and the correspondence between the time length and a service.

[0155] According to the apparatus of the embodiment of this disclosure, the network-side device transmits instruction information to the first UE, enabling the first UE to determine, based on the second information, whether or not the second UE can be the target UE, thereby solving the problem in UE-to-UE relay scenarios where the relay UE cannot determine the target UE.

[0156] Referring to Figure 8, which is a schematic diagram of another communication device 80 provided by an embodiment of the present disclosure, the communication device 80 may be a first UE, a second UE, a network-side device, a chip, chip system, or processor etc. that assists the first UE in implementing the above method, a chip, chip system, or processor etc. that assists the second UE in implementing the above method, or a chip, chip system, or processor etc. that assists the network-side device in implementing the above method. This device may be used to implement the method described in the embodiments of the above method, for which specific descriptions can be found.

[0157] The communication device 80 may include one or more processors 801. The processors 801 may be general-purpose processors or dedicated processors, for example. They may be baseband processors or central processors. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute computer programs, and process data from computer programs.

[0158] Selectively, the communication device 80 may further include one or more memories 802 capable of storing a computer program 803, and the processor 801 executes the computer program 803 so that the communication device 80 performs the method described in the embodiment of the above method. Selectively, further data may be stored in the memories 802. The communication device 80 and the memories 802 may be provided separately or integrated.

[0159] Selectively, the communication device 80 may further include a transceiver 804 and an antenna 808. The transceiver 804 may be called a transmit / receive unit, transceiver, or transmit / receive circuit, etc., for implementing transmit / receive functions. The transceiver 804 may include a receiver and a transmitter, the receiver may be called a receiver or receiving circuit, etc., for implementing a receive function, and the transmitter may be called a transmitter or transmitting circuit, etc., for implementing a transmit function.

[0160] Selectively, the communication device 80 may further include one or more interface circuits 806. The interface circuits 806 are used to receive code instructions and transmit them to the processor 801. The processor 801 executes the code instructions to cause the communication device 80 to perform the method described in the embodiments of the above method.

[0161] Here, the processor 801 is used to perform steps S201 and S202 in Figure 2, steps S301 and S302 in Figure 3, and steps S401 and S402 in Figure 4. The transceiver 804 is used to perform step S501 in Figure 5 and step S601 in Figure 6.

[0162] In one embodiment, the processor 801 may include a transceiver for implementing receiving and transmitting functions. For example, this transceiver may be a transmit / receive circuit, an interface, or an interface circuit. The transmit / receive circuit, interface, or interface circuit for implementing receiving and transmitting functions may be separate or integrated. The transmit / receive circuit, interface, or interface circuit may be used for reading or writing code or data, or it may be used for transmitting or transmitting signals.

[0163] In one implementation, the processor 801 can store a computer program that, when executed on the processor 801, causes the communication device 80 to execute the method described in the embodiment of the above method. The computer program may be hardened within the processor 801, in which case the processor 801 may be implemented by hardware.

[0164] In one embodiment, the communication device 80 may include a circuit capable of implementing the transmission, reception, or communication functions in the embodiment of the above method. The processor and transceiver described herein can be implemented in integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), hybrid signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies such as complementary metal oxide semiconductors (CMOS), n-metal oxide semiconductors (NMOS), positive channel metal oxide semiconductors (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon germanium (SiGe), and gallium arsenide (GaAs).

[0165] The communication device described in the above embodiments may be a network-side device or a terminal device, but the scope of the communication device described in this disclosure is not limited thereto, and the structure of the communication device may not be limited to Figure 8. The communication device may be an independent device or part of a larger device. For example, the communication device may be as follows: (1) an independent integrated circuit IC, or chip, or chip system or subsystem, (2) Having one or more sets of ICs, which optionally include storage components for storing data, computer programs, (3) ASICs such as modems, (4) Modules that can be incorporated into other devices (5) Receivers, terminal devices, smart terminal devices, mobile phones, wireless devices, handhelds, mobile units, in-vehicle devices, network-side devices, cloud devices, artificial intelligence devices, etc. (6) Others, etc.

[0166] If the communication device is a chip or a chip system, you can refer to the schematic configuration diagram of the chip shown in Figure 9. The chip shown in Figure 9 includes a processor 901 and an interface 902. Here, there may be one or more processors 901 and multiple interfaces 902.

[0167] When the chip is used to implement the functionality of the first UE, the processor 901 measures the signal strength between the first UE and the second UE and determines that the second UE, whose signal strength satisfies the first condition, can be the target UE.

[0168] In one implementation, the signal intensity satisfying the first condition includes the signal intensity satisfying the requirement of the first threshold, or the signal intensity continuing to satisfy the requirement of the first threshold for a first time length.

[0169] In one selectable implementation, the first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold, or the first threshold includes a minimum threshold and a maximum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold.

[0170] In one selectable implementation, interface 902 determines a first threshold and / or first time length based on the second UE.

[0171] Selectively, interface 902 receives, specifically, a first threshold and / or first time length transmitted from the second UE.

[0172] Selectively, the processor 901 specifically determines the correspondence between a threshold and / or time length and a service, the interface 902 specifically receives service instruction information transmitted from the second UE, and the processor 901 further determines a first threshold and / or first time length based on the service instruction information and the correspondence.

[0173] Selectively, the correspondence between thresholds and / or time lengths and services is provided by at least one of the network-side devices, the upper layer, and the application layer.

[0174] In one implementation, interface 902 specifically includes identification information of the target UE and / or measurement results of the target UE in the discovery signal. Selectively, the measurement results are strength indication information, and processor 901 further compares the signal strength between the first UE and the target UE with a second threshold, and determines the strength indication information of the target UE based on the comparison result between the signal strength between the first UE and the target UE and the second threshold.

[0175] Selectively, interface 902 specifically includes the identification information of the target UE in the corresponding list in the discovery signal, according to the strength indication information of the target UE.

[0176] Selectively, the second threshold may be provided by at least one of the network-side devices, higher layers, application layers, and target UEs.

[0177] If the chip is used to implement the functions of the second UE, interface 902 transmits first information to the first UE to determine whether the second UE can be a target UE.

[0178] In one implementation, the first information includes at least one of a first threshold, a first time length, and service instruction information for determining the first threshold and / or the first time length.

[0179] In one selectable implementation, the first information further includes a second threshold for determining the intensity indication information of the target UE.

[0180] When the chip is used to implement the functionality of a network-side device, interface 902 transmits second information to the first UE for determining a first threshold and / or first time length, where the first threshold and / or first time length is for determining whether the second UE can be a target UE, where the second UE is a neighboring UE of the first UE.

[0181] In one implementation, the second information includes at least one of the following: a threshold and the correspondence between the threshold and a service, and a time length and the correspondence between the time length and a service.

[0182] Selectively, the chip further includes memory 903 for storing necessary computer programs and data.

[0183] Those skilled in the art will also understand that the various illustrative logical blocks and steps described in the embodiments of this disclosure can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented in hardware or software will depend on the specific application and the design requirements of the overall system. Those skilled in the art may implement the described functionality using various methods for each specific application, but this implementation should not be understood as exceeding the scope of protection of the embodiments of this disclosure.

[0184] The embodiments of this disclosure include a communication device designated as the first UE in the embodiment of Figure 7, a communication device designated as the second UE, and a communication device designated as a network-side device, or an embodiment of the first UE, a communication device designated as the second UE, and a communication device designated as a network-side device in the embodiment of Figure 8. communication We will provide further systems.

[0185] This disclosure further provides a readable storage medium in which instructions are stored that, when executed by a computer, enable the functionality of any of the embodiments of the above methods.

[0186] This disclosure further provides computer program products that, when executed by a computer, implement the functionality of embodiments of any of the methods described above.

[0187] The embodiments described above can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, they 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. The processes or functions according to the embodiments of this disclosure are generated in whole or in part when the computer program is loaded and executed on a computer. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable device. The computer program may be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired connection (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless connection (e.g., infrared, radio, microwave, etc.). The computer-readable storage medium may be any available medium accessible by a computer, or it may include a data storage device such as a server or data center integrated by one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0188] Those skilled in the art will understand that the various numerical designations such as "First," "Second," etc., in this disclosure are merely classifications for explanatory convenience and do not limit the scope of the embodiments of this disclosure, nor do they represent priority.

[0189] At least one of the disclosures may be described as one or more, and the number may be two, three, four or more, and is not limited to the disclosures. In the embodiments of the disclosures, a technical feature of a given type is distinguished by "First," "Second," "Third," "A," "B," "C," and "D," and there is no hierarchical or hierarchical order between the technical features described in "First," "Second," "Third," "A," "B," "C," and "D."

[0190] The correspondences shown in each table in this disclosure may be set or predefined. The values ​​of the information in each table are merely examples and can be set to other values, and are not limited to this disclosure. When setting the correspondence between information and each parameter, it is not necessary to set all of the correspondences shown in each table. For example, in the tables of this disclosure, the correspondence shown by a certain row may not be set. As another example, appropriate transformation adjustments such as splitting and merging can be performed based on the above tables. The names of the parameters shown in the titles of each table above may be other names that the communication device can understand, and the values ​​or representations of those parameters may be other values ​​or representations that the communication device can understand. In implementation, each of the above tables may adopt other data structures, such as arrays, queues, containers, stacks, linear tables, pointers, linked tables, trees, diagrams, structures, classes, heaps, hash lists, or hash tables.

[0191] In this disclosure, "pre-defined" can be understood as definition, pre-defined, memory, pre-storage, pre-negotiated, pre-set, hardened, or pre-fired.

[0192] Those skilled in the art will recognize that each example unit and algorithmic step described in the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. How a certain function is performed in hardware or software will depend on the specific application and design constraints of the invention. Those skilled in the art may implement the described functions using different methods for each specific application, but such implementations should not be considered beyond the scope of this disclosure.

[0193] For the convenience and brevity of explanation, as will be obvious to those skilled in the art, the specific operating processes of the systems, apparatus, and units described above can be described by referring to the corresponding processes in the embodiments of the above methods, and are therefore omitted here.

[0194] As described above, although only specific embodiments of this disclosure are shown, the scope of protection of this disclosure is not limited thereto, and a person skilled in the art will readily realize that modifications or substitutions within the scope of the art disclosed should be included in the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be based on the scope of protection of the claims.

Claims

1. A method for determining a target UE in a terminal device (UE) to UE relay scenario, wherein the method is performed by a first UE, and the method is A step of measuring the signal strength between the first UE and the second UE, wherein the first UE is a relay UE in a UE-to-UE relay scenario, and the second UE is a remote UE in a UE-to-UE relay scenario, The step of determining that a second UE whose signal intensity satisfies the first condition can be designated as a target UE, The step of transmitting a discovery signal that includes identification information of the target UE and / or measurement results of the target UE, A method for determining a target UE in a UE-to-UE relay scenario, characterized by the following features.

2. The signal intensity satisfying the first condition means that The signal intensity satisfies the requirement of the first threshold, or This includes the condition that the signal intensity continues to satisfy the requirement of the first threshold for a first time duration, A method for determining a target UE in a UE-to-UE relay scenario as described in feature 1.

3. The first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being equal to or greater than the minimum threshold, or The first threshold includes the minimum threshold and the maximum threshold, and the signal intensity satisfying the requirements of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold. The method for determining a target UE in a UE-to-UE relay scenario as described in feature 2.

4. The further step includes determining the first threshold and / or the first time length based on the information transmitted from the second UE, The method for determining a target UE in a UE-to-UE relay scenario as described in feature 2.

5. The step of determining the first threshold and / or the first time length based on the information transmitted from the second UE is: The step includes receiving the first threshold and / or the first time length transmitted from the second UE, Or, The step of determining the first threshold and / or the first time length based on the information transmitted from the second UE is: A step of determining the correspondence between thresholds and / or time lengths and services, The steps include receiving service instruction information transmitted from the second UE, The step of determining the first threshold and / or the first time length based on the service instruction information and the correspondence relationship, The correspondence between the threshold and / or time duration and the service is provided by at least one of the network-side device, the upper layer, and the application layer. The method for determining a target UE in a UE-to-UE relay scenario as described in feature 4.

6. The measurement result is strength indication information, and the method is A step of comparing the signal intensity between the first UE and the target UE with a second threshold, The method further includes the step of determining strength indication information for the target UE based on the result of comparing the signal intensity between the first UE and the target UE with the second threshold, The step of including the identification information of the target UE in the discovery signal is: The step includes including the identification information of the target UE in the corresponding list in the discovery signal according to the strength indication information of the target UE, The second threshold is provided by at least one of the network-side device, the upper layer, the application layer, and the target UE. A method for determining a target UE in a UE-to-UE relay scenario as described in feature 1.

7. A method for determining a target UE in a terminal device (UE) to UE relay scenario, wherein the method is performed by a second UE, and the method is A step of receiving a discovery signal transmitted from a first UE, wherein the discovery signal includes identification information of a target UE and / or measurement results of the target UE, the first UE is a relay UE in a UE-to-UE relay scenario, the second UE is a remote UE in a UE-to-UE relay scenario, and the target UE is determined by the first UE measuring the signal strength between the first UE and the second UE, and determining that the second UE whose signal strength satisfies a first condition can be the target UE. A method for determining a target UE in a UE-to-UE relay scenario, characterized by the following features.

8. The signal intensity satisfying the first condition means that The signal intensity satisfies the requirement of the first threshold, or This includes the condition that the signal intensity continues to satisfy the requirement of the first threshold for a first time duration, A method for determining a target UE in a UE-to-UE relay scenario as described in feature 7.

9. The first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being equal to or greater than the minimum threshold, or The first threshold includes the minimum threshold and the maximum threshold, and the signal intensity satisfying the requirements of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold. The method for determining a target UE in a UE-to-UE relay scenario according to feature 8.

10. The method according to any one of claims 1 to 9 is performed. A communication device characterized by the following features.

11. A method for determining a target UE in a terminal device (UE) to UE relay scenario, wherein the method is applied to a communication system, the communication system includes a first UE, a second UE and a network-side device, the first UE is a relay UE in a UE-to-UE relay scenario, the second UE is a remote UE in a UE-to-UE relay scenario, and the method is: The first UE measures the signal strength between the first UE and the second UE, The first UE determines that the second UE whose signal intensity satisfies the first condition can be designated as the target UE, The first UE transmits a discovery signal that includes identification information of the target UE and / or measurement results of the target UE, A method for determining a target UE in a UE-to-UE relay scenario, characterized by the following features.

12. The signal intensity satisfying the first condition means that The signal intensity satisfies the requirement of the first threshold, or This includes the condition that the signal intensity continues to satisfy the requirement of the first threshold for a first time duration, The method for determining a target UE in a UE-to-UE relay scenario according to feature 11.

13. The first threshold is a minimum threshold, and the signal intensity satisfying the requirement of the first threshold includes the signal intensity being equal to or greater than the minimum threshold, or The first threshold includes the minimum threshold and the maximum threshold, and the signal intensity satisfying the requirements of the first threshold includes the signal intensity being greater than or equal to the minimum threshold and less than or equal to the maximum threshold. The method for determining a target UE in a UE-to-UE relay scenario according to feature 12.

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