WO2024065199A1 - 用于终端设备ue到ue中继场景的中继ue选择方法及其装置 - Google Patents

用于终端设备ue到ue中继场景的中继ue选择方法及其装置 Download PDF

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Publication number
WO2024065199A1
WO2024065199A1 PCT/CN2022/121814 CN2022121814W WO2024065199A1 WO 2024065199 A1 WO2024065199 A1 WO 2024065199A1 CN 2022121814 W CN2022121814 W CN 2022121814W WO 2024065199 A1 WO2024065199 A1 WO 2024065199A1
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relay
rsrp
predefined threshold
candidate
target
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PCT/CN2022/121814
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English (en)
French (fr)
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江小威
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北京小米移动软件有限公司
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Application filed by 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to PCT/CN2022/121814 priority Critical patent/WO2024065199A1/zh
Priority to CN202280003633.0A priority patent/CN118104306A/zh
Publication of WO2024065199A1 publication Critical patent/WO2024065199A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality

Definitions

  • the present disclosure relates to the field of communication technology, and in particular to a relay UE selection method and device for a terminal device UE to UE relay scenario.
  • terminal device UE A may not be directly connected to UE B, but may be connected to UE B through the relay of UE C.
  • UE C that provides the relay function is a relay UE, and the above-mentioned connected UEs communicate through sidelink unicast.
  • This architecture is called U2U (UE to UE) relay.
  • U2U UE to UE
  • the disclosed embodiments provide a relay UE selection method and apparatus for a terminal device UE to UE relay scenario, which can be applied to vehicle networking, such as vehicle to everything (V2X) communication, long term evolution-vehicle (LTE-V) communication, vehicle to vehicle (V2V) communication, etc., or can be used in the fields of intelligent driving, intelligent connected vehicles, etc., and select a target relay UE from at least one relay UE by obtaining SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE cannot select a suitable target relay UE from multiple relay UEs in the UE to UE relay scenario.
  • vehicle networking such as vehicle to everything (V2X) communication, long term evolution-vehicle (LTE-V) communication, vehicle to vehicle (V2V) communication, etc.
  • V2X vehicle to everything
  • LTE-V long term evolution-vehicle
  • V2V vehicle to vehicle
  • an embodiment of the present disclosure provides a relay UE selection method for a terminal device UE to UE relay scenario, the method being executed by a first UE, and the method comprising: receiving at least one first message sent by at least one relay UE; obtaining a sidelink reference signal received power SL-RSRP and/or a sidelink discovery reference signal received power SD-RSRP between the first UE and the at least one relay UE respectively; and selecting a target relay UE from the at least one relay UE based on the obtained SL-RSRP or the SD-RSRP and a predefined threshold.
  • the first UE can select a target relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE cannot select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • the selecting a target relay UE from the at least one relay UE based on the acquired SL-RSRP or the SD-RSRP and a predefined threshold includes: determining at least one candidate relay UE from the at least one relay UE based on the acquired SL-RSRP or the SD-RSRP and a predefined threshold; and selecting a candidate relay UE from the at least one candidate relay UE to be determined as the target relay UE.
  • the predefined threshold includes a first predefined threshold and/or a second predefined threshold, wherein the first predefined threshold is a minimum threshold and the second predefined threshold is a maximum threshold.
  • the predefined threshold is the first predefined threshold; the determining at least one candidate relay UE from the at least one relay UE based on the acquired SL-RSRP or the SD-RSRP and the predefined threshold includes: comparing the acquired SL-RSRP or the SD-RSRP with the first predefined threshold, and determining one or more relay UEs that meet the first candidate relay selection condition from the at least one relay UE; determining the one or more relay UEs that meet the first candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the first candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one lag parameter value of the first predefined threshold.
  • the predefined threshold is the second predefined threshold; determining at least one candidate relay UE from the at least one relay UE based on the acquired SL-RSRP or the SD-RSRP and the predefined threshold includes: comparing the acquired SL-RSRP or the SD-RSRP with the second predefined threshold, and determining one or more relay UEs that meet the second candidate relay selection condition from the at least one relay UE; determining the one or more relay UEs that meet the second candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the second candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than at least one lag parameter value of the second predefined threshold.
  • the predefined threshold includes the first predefined threshold and the second predefined threshold; the determining at least one candidate relay UE from the at least one relay UE based on the acquired SL-RSRP or the SD-RSRP and the predefined threshold includes: comparing the acquired SL-RSRP or the SD-RSRP with the first predefined threshold and the second predefined threshold, and determining one or more relay UEs that meet the third candidate relay selection condition from the at least one relay UE; determining the one or more relay UEs that meet the third candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the third candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one hysteresis parameter value of the first predefined threshold
  • the selecting a candidate relay UE from the at least one candidate relay UE to be determined as the target relay UE includes: selecting a candidate relay UE with the highest SL-RSRP or SD-RSRP between the candidate relay UE and the first UE as the target relay UE; or randomly selecting a candidate relay UE from the at least one candidate relay UE to be determined as the target relay UE.
  • the method also includes: in response to the at least one relay UE not being the candidate relay UE, selecting a relay UE with the highest SL-RSRP or SD-RSRP between the at least one relay UE and the first UE as the target relay UE, or randomly selecting a relay UE from the at least one relay UE as the target relay UE.
  • the at least one first message sent by the at least one relay UE is at least one notification message broadcast by the at least one relay UE; the first UE is a nearby terminal device.
  • the at least one first message sent by the at least one relay UE is at least one discovery request message forwarded by the at least one relay UE; and the first UE is a target remote UE.
  • the method further includes: based on the discovery request message forwarded by the target relay UE, the target remote UE generates a discovery response message; and the target remote UE forwards the discovery response message via the target relay UE.
  • the at least one first message sent by the at least one relay UE is at least one discovery response message forwarded by the at least one relay UE; and the first UE is a source remote UE.
  • an embodiment of the present disclosure provides a relay UE selection method for a terminal device UE to UE relay scenario, the method is executed by a second UE, the second UE is the relay UE in the UE to UE relay scenario, and the method includes: sending a first message to a first UE; the first message is used to assist the first UE to determine whether to select the second UE as the target relay UE based on the acquired sidelink reference signal received power SL-RSRP or sidelink discovery reference signal received power SD-RSRP between the first UE and the second UE, and a predefined threshold.
  • the first message is a notification message broadcast by the second UE; the first UE is a nearby terminal device.
  • the first message is a discovery request message forwarded by the second UE; and the first UE is a target remote UE.
  • the first message is a discovery response message forwarded by the second UE; the first UE is a source remote UE.
  • the second UE can send the first message to the first UE, so that the first UE can select a target relay UE from at least one relay UE based on the first message, thereby solving the problem that the first UE cannot select a suitable target relay UE from multiple relay UEs in a UE-to-UE relay scenario.
  • an embodiment of the present disclosure provides a communication device, the device comprising: a transceiver module, configured to receive at least one first message sent by at least one relay UE; obtain the SL-RSRP and/or SD-RSRP between the first UE and at least one relay UE respectively; a processing module, configured to select a target relay UE from at least one relay UE according to the obtained SL-RSRP or SD-RSRP and a predefined threshold.
  • the processing module is specifically configured to: determine at least one candidate relay UE from at least one relay UE according to the obtained SL-RSRP or SD-RSRP and a predefined threshold; and select a candidate relay UE from at least one candidate relay UE to be determined as the target relay UE.
  • the predefined threshold includes a first predefined threshold and/or a second predefined threshold, wherein the first predefined threshold is a minimum threshold and the second predefined threshold is a maximum threshold.
  • the predefined threshold is a first predefined threshold; the processing module is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold, and determine one or more relay UEs that meet the first candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the first candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the first candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one lag parameter value of the first predefined threshold.
  • the predefined threshold is a second predefined threshold; the processing module is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the second predefined threshold, and determine one or more relay UEs that meet the second candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the second candidate relay selection condition as at least one candidate relay UE; wherein, the one or more relay UEs that meet the second candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than at least one lag parameter value of the second predefined threshold.
  • the predefined threshold includes a first predefined threshold and a second predefined threshold; the processing module is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold and the second predefined threshold, and determine one or more relay UEs that meet the third candidate relay selection condition from at least one relay UE; determine the one or more relay UEs that meet the third candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the third candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one hysteresis parameter value of the first predefined threshold and less than at least one hysteresis parameter value of the second predefined threshold.
  • the processing module is specifically used to: select a candidate relay UE with the highest SL-RSRP or SD-RSRP between it and the first UE from at least one candidate relay UE to determine it as the target relay UE; or randomly select a candidate relay UE from at least one candidate relay UE to determine it as the target relay UE.
  • the processing module is also used to: in response to at least one relay UE not being a candidate relay UE, select, from at least one relay UE, a relay UE having the highest SL-RSRP or SD-RSRP with the first UE as a target relay UE, or randomly select one relay UE from at least one relay UE as a target relay UE.
  • At least one first message sent by at least one relay UE is at least one notification message broadcast by at least one relay UE; the first UE is a nearby terminal device.
  • At least one first message sent by at least one relay UE is at least one discovery request message forwarded by at least one relay UE; and the first UE is a target remote UE.
  • the processing module is further used for: based on the discovery request message forwarded by the target relay UE, the target remote UE generates a discovery response message; the transceiver module is further used for: the target remote UE forwards the discovery response message through the target relay UE.
  • At least one first message sent by at least one relay UE is at least one discovery response message forwarded by at least one relay UE; and the first UE is a source remote UE.
  • an embodiment of the present disclosure provides a communication device, comprising: a transceiver module, used to send a first message to a first UE; the first message is used to assist the first UE to determine whether to select the second UE as a target relay UE based on the acquired sidelink reference signal received power SL-RSRP or sidelink discovery reference signal received power SD-RSRP between the first UE and the second UE, and a predefined threshold.
  • the first message is a notification message broadcast by the second UE; the first UE is a nearby terminal device.
  • the first message is a discovery request message forwarded by the second UE; and the first UE is a target remote UE.
  • the first message is a discovery response message forwarded by the second UE; and the first UE is a source remote UE.
  • an embodiment of the present disclosure provides a communication device, which includes a processor.
  • the processor calls a computer program in a memory, the method described in the first aspect is executed.
  • an embodiment of the present disclosure provides a communication device, which includes a processor.
  • the processor calls a computer program in a memory, the method described in the second aspect is executed.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the first aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the second aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the first aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the second aspect above.
  • an embodiment of the present disclosure provides a relay UE selection system for a terminal device UE to UE relay scenario, the system including the communication device described in the third aspect and the communication device described in the fourth aspect, or the system including the communication device described in the fifth aspect and the communication device described in the sixth aspect, or the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the communication device described in the ninth aspect and the communication device described in the tenth aspect.
  • an embodiment of the present invention provides a computer-readable storage medium for storing instructions for the above-mentioned terminal device, and when the instructions are executed, the terminal device executes the method described in the first aspect.
  • an embodiment of the present invention provides a computer-readable storage medium for storing instructions for the above-mentioned terminal device, and when the instructions are executed, the terminal device executes the method described in the above-mentioned second aspect.
  • the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.
  • the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect above.
  • the present disclosure provides a chip system, which includes at least one processor and an interface, and is used to support a terminal device to implement the functions involved in the first aspect, for example, determining or processing at least one of the data and information involved in the above method.
  • the chip system also includes a memory, and the memory is used to store computer programs and data necessary for the terminal device.
  • the chip system can be composed of a chip, or it can include a chip and other discrete devices.
  • the present disclosure provides a chip system, which includes at least one processor and an interface, for supporting a terminal device to implement the functions involved in the second aspect, for example, determining or processing at least one of the data and information involved in the above method.
  • the chip system also includes a memory, which is used to store computer programs and data necessary for the terminal device.
  • the chip system can be composed of a chip, or it can include a chip and other discrete devices.
  • the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect.
  • the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in the second aspect.
  • FIG1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure.
  • FIG2 is a flow chart of a relay UE selection method for a terminal device UE to UE relay scenario provided by an embodiment of the present disclosure
  • FIG3 is a flow chart of another method for selecting a relay UE for a terminal device UE to UE relay scenario provided by an embodiment of the present disclosure
  • FIG4 is a flow chart of another method for selecting a relay UE for a terminal device UE to UE relay scenario provided by an embodiment of the present disclosure
  • FIG5 is a schematic diagram of the structure of a communication device provided by an embodiment of the present disclosure.
  • FIG6 is a schematic diagram of the structure of another communication device provided in an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of the structure of a chip provided in an embodiment of the present disclosure.
  • model A For U2U (UE to UE) scenarios, there are currently two modes for sending discovery request messages: model A and model B.
  • model A one or more relay UEs periodically broadcast notification messages that carry the address of the target remote terminal, and the source remote terminal can listen to the notification message.
  • model B one or more relay UEs forward the discovery request message sent by the source remote terminal.
  • the source remote terminal since the source remote terminal may receive notification messages from multiple relay UEs, the source remote terminal needs to determine a suitable target relay UE from multiple relay UEs.
  • model B since the target remote terminal may receive discovery request messages forwarded by multiple relay UEs, the target remote terminal needs to determine a suitable target relay UE from multiple relay UEs.
  • 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 a first UE and a relay UE.
  • the number and form of devices shown in Figure 1 are only used for example and do not constitute a limitation on the embodiment of the present disclosure. In actual applications, two or more first UEs and two or more relay UEs may be included.
  • the communication system shown in Figure 1 takes the first UE 102 and the relay UE 102 as an example.
  • LTE long term evolution
  • 5G fifth generation
  • NR 5G new radio
  • the first UE 101 and the relay UE 102 in the disclosed embodiment are entities for receiving or transmitting signals on the user side, such as a mobile phone.
  • the terminal device may also be referred to as a terminal device (terminal), a user equipment (UE), a mobile station (MS), a mobile terminal device (MT), etc.
  • the terminal device may be a car with communication function, a smart car, a mobile phone (mobile phone), a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in a smart city (smart city), a wireless terminal device in a smart home (smart home), etc.
  • the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal device.
  • the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure.
  • a person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.
  • FIG. 2 is a flow chart of a method for selecting a relay UE for a terminal device UE to UE relay scenario provided by an embodiment of the present disclosure.
  • the method is executed by a first UE.
  • the method may include but is not limited to the following steps:
  • Step S201 Receive at least one first message sent by at least one relay UE.
  • Step S202 Obtain SL-RSRP (sidelink reference signal receiving power) and/or SD-RSRP (sidelink-discovery reference signal receiving power) between the first UE and at least one relay UE.
  • SL-RSRP sidelink reference signal receiving power
  • SD-RSRP sidelink-discovery reference signal receiving power
  • the first UE obtains the SL-RSRP between the first UE and at least one relay UE.
  • the first UE obtains the SD-RSRP between the first UE and at least one relay UE.
  • the first UE obtains the SL-RSRP and SD-RSRP between the first UE and at least one relay UE.
  • Step S203 Select a target relay UE from at least one relay UE according to the acquired SL-RSRP or SD-RSRP and a predefined threshold.
  • the above-mentioned predefined threshold may be configured by a network side device, or may be pre-configured.
  • the first UE can obtain the above-mentioned predefined threshold based on a dedicated RRC (radio resource control) signaling or SIB (signaling in band) sent by a network side device.
  • RRC radio resource control
  • SIB signaling in band
  • different predefined thresholds may be pre-configured for different RSCs (relay service codes).
  • the relay UE may carry different RSCs according to actual conditions, so that the first UE may select the corresponding predefined threshold based on the RSC in the first message.
  • the first UE can select a target relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE cannot select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • the first UE may determine at least one candidate relay UE from at least one relay UE according to a preset relay selection condition, and select a candidate relay UE from at least one candidate relay UE to determine as a target relay UE.
  • FIG. 3 is a flowchart of another relay UE selection method for a terminal device UE to UE relay scenario provided by the embodiment of the present disclosure. The method is executed by the first UE. As shown in FIG. 3, the method may include but is not limited to the following steps:
  • Step S301 Receive at least one first message sent by at least one relay UE.
  • Step S302 Obtain SL-RSRP and/or SD-RSRP between the first UE and at least one relay UE.
  • Step S303 Determine at least one candidate relay UE from at least one relay UE according to the acquired SL-RSRP or SD-RSRP and a predefined threshold.
  • the predefined threshold includes a first predefined threshold and/or a second predefined threshold, wherein the first predefined threshold is a minimum threshold and the second predefined threshold is a maximum threshold.
  • the predefined threshold includes a first predefined threshold, and the first predefined threshold is a lowest threshold of SL-RSRP or SD-RSRP.
  • the predefined threshold includes a second predefined threshold, and the second predefined threshold is a highest threshold of SL-RSRP or SD-RSRP.
  • the predefined threshold includes a first predefined threshold and a second predefined threshold, wherein the first predefined threshold is the lowest threshold of SL-RSRP or SD-RSRP, and the second predefined threshold is the highest threshold of SL-RSRP or SD-RSRP.
  • the above-mentioned predefined threshold is a first predefined threshold; the above-mentioned determining at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and the predefined threshold may include the following steps: comparing the acquired SL-RSRP or SD-RSRP with the first predefined threshold, and determining one or more relay UEs that meet the first candidate relay selection condition from at least one relay UE; determining one or more relay UEs that meet the first candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the first candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one lag parameter value of the first predefined threshold.
  • Example 1 Taking the SL-RSRP between the first UE and at least one relay UE as an example, the first UE compares the SL-RSRP corresponding to each relay UE obtained with the first predefined threshold, and determines one or more relay UEs corresponding to the SL-RSRP greater than or equal to the first predefined threshold as candidate relay UEs.
  • Example 2 Taking the SD-RSRP between the first UE and at least one relay UE as an example, the first UE compares the SD-RSRP corresponding to each relay UE obtained with the first predefined threshold, and determines one or more relay UEs corresponding to the SD-RSRP greater than or equal to the first predefined threshold as candidate relay UEs.
  • Example 3 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 1 or Example 2 based on the result of the random selection.
  • Example 4 taking the SL-RSRP between the first UE and at least one relay UE as an example, the first UE will compare the SL-RSRP corresponding to each relay UE with the first predefined threshold, and determine one or more relay UEs corresponding to SL-RSRP that is greater than the first predefined threshold by a preset hysteresis or more as candidate relay UEs.
  • Example 5 taking the example of the first UE obtaining the SD-RSRP between itself and at least one relay UE, the first UE compares the SD-RSRP corresponding to each relay UE obtained with the first predefined threshold, and determines one or more relay UEs corresponding to an SD-RSRP greater than or equal to the first predefined threshold by a preset hysteresis or more as candidate relay UEs.
  • Example 6 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 4 or Example 5 based on the result of the random selection.
  • the above-mentioned predefined threshold is a second predefined threshold; the above-mentioned determining at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and the predefined threshold may include the following steps: comparing the acquired SL-RSRP or SD-RSRP with the second predefined threshold, and determining one or more relay UEs that meet the second candidate relay selection condition from at least one relay UE; determining one or more relay UEs that meet the second candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the second candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than at least one lag parameter value of the second predefined threshold.
  • Example 7 taking the example of the first UE obtaining the SL-RSRP between it and at least one relay UE, the first UE compares the SL-RSRP corresponding to each relay UE obtained with the second predefined threshold, and determines one or more relay UEs corresponding to the SL-RSRP less than or equal to the second predefined threshold as candidate relay UEs.
  • Example 8 Taking the SD-RSRP between the first UE and at least one relay UE as an example, the first UE compares the SD-RSRP corresponding to each relay UE with the second predefined threshold, and determines one or more relay UEs corresponding to the SD-RSRP less than or equal to the second predefined threshold as candidate relay UEs.
  • Example 9 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 7 or Example 8 based on the result of the random selection.
  • Example 10 taking the example of the first UE obtaining the SL-RSRP between itself and at least one relay UE, the first UE compares the SL-RSRP corresponding to each relay UE obtained with the second predefined threshold, and determines one or more relay UEs corresponding to the SL-RSRP that is less than the second predefined threshold by a preset hysteresis or smaller as candidate relay UEs.
  • Example 11 taking the example of the first UE obtaining the SD-RSRP between itself and at least one relay UE, the first UE compares the SD-RSRP corresponding to each relay UE obtained with the second predefined threshold, and determines one or more relay UEs corresponding to an SD-RSRP that is less than the second predefined threshold by a preset hysteresis or less as candidate relay UEs.
  • Example 12 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 10 or Example 11 based on the result of the random selection.
  • the above-mentioned predefined threshold includes a first predefined threshold and a second predefined threshold; the above-mentioned determining at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and the predefined threshold may include the following steps: comparing the acquired SL-RSRP or SD-RSRP with the first predefined threshold and the second predefined threshold, and determining one or more relay UEs that meet the third candidate relay selection condition from at least one relay UE; determining one or more relay UEs that meet the third candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the third candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold; or one or more relay UEs whose SL-RSRP or SD-RSRP with the first
  • the hysteresis parameter value corresponding to the first threshold and the hysteresis parameter value corresponding to the second threshold may be the same or different; at least one hysteresis parameter value greater than the first predefined threshold means greater than or equal to a preset hysteresis of the first predefined threshold or greater; at least one hysteresis parameter value less than the second predefined threshold means less than or equal to a preset hysteresis of the second predefined threshold or less.
  • Example 13 taking the example of the first UE obtaining the SL-RSRP between it and at least one relay UE, the first UE compares the SL-RSRP corresponding to each relay UE obtained with the first predefined threshold and the second predefined threshold, and determines one or more relay UEs corresponding to the SL-RSRP greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold as candidate relay UEs.
  • Example 14 Taking the SD-RSRP between the first UE and at least one relay UE as an example, the first UE compares the SD-RSRP corresponding to each relay UE with the first predefined threshold and the second predefined threshold, and determines one or more relay UEs corresponding to the SD-RSRP greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold as candidate relay UEs.
  • Example 15 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 13 or Example 14 based on the result of the random selection.
  • Example 16 taking the example of the first UE obtaining the SL-RSRP between it and at least one relay UE, the first UE compares the SL-RSRP corresponding to each relay UE with the first predefined threshold and the second predefined threshold, and determines one or more relay UEs corresponding to the SL-RSRP greater than at least one hysteresis parameter value of the first predefined threshold and less than at least one hysteresis parameter value of the second predefined threshold as candidate relay UEs.
  • Example 17 taking the SD-RSRP between the first UE and at least one relay UE as an example, the first UE compares the SD-RSRP corresponding to each relay UE with the first predefined threshold and the second predefined threshold, and determines one or more relay UEs corresponding to the SD-RSRP greater than at least one hysteresis parameter value of the first predefined threshold and less than at least one hysteresis parameter value of the second predefined threshold as candidate relay UEs.
  • Example 18 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE can randomly select one from the SL-RSRP and SD-RSRP based on the implementation, and perform the same process as the above Example 16 or Example 17 based on the result of the random selection.
  • Step S303 Select a candidate relay UE from at least one candidate relay UE and determine it as a target relay UE.
  • the first UE selects one with the highest communication efficiency from at least one candidate relay UE and determines it as the target relay UE.
  • selecting a candidate relay UE from at least one candidate relay UE to be determined as a target relay UE includes: selecting a candidate relay UE with the highest SL-RSRP or SD-RSRP between the candidate relay UE and the first UE to be determined as the target relay UE; or randomly selecting a candidate relay UE from at least one candidate relay UE to be determined as the target relay UE.
  • Example 19 taking the example of the first UE obtaining the SL-RSRP between itself and at least one relay UE, the first UE selects the candidate relay UE with the highest SL-RSRP between itself and the first UE as the target relay UE.
  • Example 20 taking the example of the first UE obtaining the SD-RSRP between itself and at least one relay UE, the first UE selects the candidate relay UE having the highest SD-RSRP with the first UE as the target relay UE.
  • Example 21 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE randomly selects one of the SL-RSRP and SD-RSRP based on the implementation in the previous step, and according to the result of the random selection, performs the same process as the above Example 19 or Example 20.
  • Example 22 The first UE randomly selects a candidate relay UE from at least one candidate relay UE as a target relay UE based on implementation.
  • the first UE can select a target relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE cannot select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • the first UE may determine the relay UE with the largest SL-RSRP or SD-RSRP between the first UE and the first UE as the target relay UE; or, the first terminal device may select the relay UE with the best communication effect based on implementation or randomly select a relay UE.
  • Example 23 taking the example of the first UE obtaining the SL-RSRP between it and at least one relay UE, if the SL-RSRP corresponding to all relay UEs does not meet the selection conditions of any embodiment of the present disclosure compared with the predefined threshold, the first UE can determine the relay UE with the largest SL-RSRP between it and the first UE as the target relay UE.
  • Example 24 taking the example of the first UE obtaining the SD-RSRP between it and at least one relay UE, if the SL-RSRP corresponding to all relay UEs does not meet the selection conditions of any embodiment of the present disclosure compared with the predefined threshold, the first UE can determine the relay UE with the largest SD-RSRP between it and the first UE as the target relay UE.
  • Example 25 taking the example of the first UE obtaining the SL-RSRP and SD-RSRP between it and at least one relay UE, the first UE randomly selects one of the SL-RSRP and SD-RSRP based on the implementation in the previous step, and according to the result of the random selection, performs the same process as the above Example 23 or Example 24.
  • the first terminal device can select a suitable relay UE when it is unable to determine at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE is unable to select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • At least one first message sent by at least one relay UE is at least one notification message broadcast by at least one relay UE; the first UE is a nearby terminal device.
  • the adjacent terminal devices are other UEs that are adjacent to the relay UE in the UE-to-UE relay communication scenario and need to communicate through the relay UE.
  • a nearby terminal device uses at least one notification message broadcast by at least one relay UE as a first message, and adopts the relay UE selection method for a terminal device UE to UE relay scenario of any of the above embodiments to determine a target relay UE.
  • At least one first message sent by at least one relay UE is at least one discovery request message forwarded by at least one relay UE; the first UE is a target remote UE.
  • the target remote UE refers to a remote UE that receives data in a UE-to-UE relay communication scenario.
  • the target remote UE uses at least one discovery request message forwarded by a relay UE as the first message, and adopts the relay UE selection method for the terminal device UE to UE relay scenario of any of the above embodiments to determine the target relay UE.
  • the above-mentioned relay UE selection method for the terminal device UE to UE relay scenario also includes: based on the discovery request message forwarded by the target relay UE, the target remote UE generates a discovery response message; the target remote UE forwards the discovery response message through the target relay UE.
  • the target remote UE determines the target relay UE, it generates a discovery response message based on the discovery request message forwarded by the target relay UE, and forwards the discovery response message only through the target relay UE.
  • At least one first message sent by at least one relay UE is at least one discovery response message forwarded by at least one relay UE; the first UE is a source remote UE.
  • the source remote UE refers to a remote UE that sends data in a UE-to-UE relay communication scenario.
  • the source remote UE takes at least one discovery response message forwarded by at least one relay UE as the first message, and adopts the relay UE selection method for the terminal device UE to UE relay scenario of any of the above embodiments to determine the target relay UE.
  • the above embodiment describes the implementation of the failure handling method of the embodiment of the present disclosure from the first UE side.
  • the embodiment of the present disclosure also proposes another relay UE selection method for a terminal device UE to UE relay scenario, and the implementation of the method will be described from the relay UE.
  • FIG. 4 is another relay UE selection method for a terminal device UE to UE relay scenario provided by an embodiment of the present disclosure.
  • the method is executed by the relay UE.
  • the method may include but is not limited to the following steps:
  • Step S401 Send a first message to a first UE.
  • the first message is used to assist the first UE to determine whether to select the second UE as the target relay UE based on the acquired SL-RSRP or SD-RSRP between the first UE and the second UE, and a predefined threshold.
  • the specific implementation method can be implemented by any one of the embodiments of the present disclosure. The embodiments of the present disclosure do not limit this and will not be repeated.
  • the first message is a notification message broadcast by the second UE; the first UE is a nearby terminal device.
  • the second UE sends a notification message to nearby terminal devices by broadcasting.
  • the first message is a discovery request message forwarded by the second UE; the first UE is a target remote UE.
  • the second UE forwards the discovery request message received by the second UE to the target remote UE.
  • the first message is a discovery response message forwarded by the second UE; the first UE is a source remote UE.
  • the second UE forwards the discovery response message received by the second UE to the source remote UE.
  • the second UE can send a first message to the first UE, so that the first UE can select a target relay UE from at least one relay UE based on the first message, thereby solving the problem that the first UE cannot select a suitable target relay UE from multiple relay UEs in a UE-to-UE relay scenario.
  • the communication device 50 shown in Figure 5 may include a transceiver module 501 and a processing module 502.
  • the transceiver module 501 may include a sending module and/or a receiving module, the sending module is used to implement the sending function, the receiving module is used to implement the receiving function, and the transceiver module 501 can implement the sending function and/or the receiving function.
  • the communication device 50 may be the first UE, or a device in the first UE, or a device that can be used together with the first UE.
  • the communication device 50 may be the second UE, or a device in the second UE, or a device that can be used together with the second UE.
  • the communication device 50 is a first UE: a transceiver module 501 is used to receive at least one first message sent by at least one relay UE; obtain the SL-RSRP and/or SD-RSRP between the first UE and at least one relay UE respectively; a processing module 502 is used to select a target relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold.
  • the processing module 502 is specifically used to: determine at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold; select a candidate relay UE from the at least one candidate relay UE to be determined as the target relay UE.
  • the predefined threshold includes a first predefined threshold and/or a second predefined threshold, wherein the first predefined threshold is a minimum threshold and the second predefined threshold is a maximum threshold.
  • the predefined threshold is a first predefined threshold
  • the processing module 502 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold, and determine one or more relay UEs that meet the first candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the first candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the first candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one lag parameter value of the first predefined threshold.
  • the predefined threshold is a second predefined threshold; the processing module 502 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the second predefined threshold, and determine one or more relay UEs that meet the second candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the second candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the second candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than at least one lag parameter value of the second predefined threshold.
  • the predefined threshold includes a first predefined threshold and a second predefined threshold; the processing module 502 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold and the second predefined threshold, and determine one or more relay UEs that meet the third candidate relay selection condition from at least one relay UE; determine the one or more relay UEs that meet the third candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the third candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one hysteresis parameter value of the first predefined threshold and less than at least one hysteresis parameter value of the second predefined threshold.
  • the processing module 502 is specifically used to: select a candidate relay UE with the highest SL-RSRP or SD-RSRP between it and the first UE from at least one candidate relay UE to determine it as the target relay UE; or randomly select a candidate relay UE from at least one candidate relay UE to determine it as the target relay UE.
  • the processing module 502 is also used to: in response to at least one relay UE not being a candidate relay UE, select, from at least one relay UE, a relay UE with the highest SL-RSRP or SD-RSRP with the first UE as a target relay UE, or randomly select a relay UE from at least one relay UE as a target relay UE.
  • At least one first message sent by at least one relay UE is at least one notification message broadcast by at least one relay UE; the first UE is a nearby terminal device.
  • At least one first message sent by at least one relay UE is at least one discovery request message forwarded by at least one relay UE; and the first UE is a target remote UE.
  • the processing module 502 is further used for: based on the discovery request message forwarded by the target relay UE, the target remote UE generates a discovery response message; the transceiver module 501 is further used for: the target remote UE forwards the discovery response message through the target relay UE.
  • At least one first message sent by at least one relay UE is at least one discovery response message forwarded by at least one relay UE; and the first UE is a source remote UE.
  • the first UE can select a target relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold, thereby solving the problem that the first UE cannot select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • the communication device 50 is a second UE: the transceiver module 501 is used to send a first message to the first UE; the first message is used to assist the first UE to determine whether to select the second UE as the target relay UE based on the acquired sidelink reference signal received power SL-RSRP or sidelink discovery reference signal received power SD-RSRP between the first UE and the second UE, and a predefined threshold.
  • the first message is a notification message broadcast by the second UE; the first UE is a nearby terminal device.
  • the first message is a discovery request message forwarded by the second UE; the first UE is a target remote UE.
  • the first message is a discovery response message forwarded by the second UE; the first UE is a source remote UE.
  • the second UE can send a first message to the first UE, so that the first UE can select a target relay UE from at least one relay UE based on the first message, thereby solving the problem that the first UE cannot select a suitable target relay UE among multiple relay UEs in a UE-to-UE relay scenario.
  • the communication device 60 can be a network device, or a terminal device, or a chip, a chip system, or a processor that supports the network device to implement the above method, or a chip, a chip system, or a processor that supports the terminal device to implement the above method.
  • the device can be used to implement the method described in the above method embodiment, and the details can be referred to the description in the above method embodiment.
  • the communication device 60 may include one or more processors 601.
  • the processor 601 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit.
  • the baseband processor may be used to process the communication protocol and communication data
  • the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a computer program, and process the data of the computer program.
  • the communication device 60 may further include one or more memories 602, on which a computer program 603 may be stored, and the processor 601 executes the computer program 603 so that the communication device 60 performs the method described in the above method embodiment.
  • data may also be stored in the memory 602.
  • the communication device 60 and the memory 602 may be provided separately or integrated together.
  • the communication device 60 may further include a transceiver 604 and an antenna 605.
  • the transceiver 604 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function.
  • the transceiver 604 may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.
  • the communication device 60 may further include one or more interface circuits 606.
  • the interface circuit 606 is used to receive code instructions and transmit them to the processor 601.
  • the processor 601 runs the code instructions to enable the communication device 60 to execute the method described in the above method embodiment.
  • the communication device 60 is a first UE: the processor 601 is used to execute step S202 in Figure 2; and execute step S302 and step S303 in Figure 3.
  • the transceiver 604 is used to execute step S201 in Figure 2 and step S301 in Figure 3; and execute step S401 in Figure 4.
  • the processor 601 may include a transceiver for implementing the receiving and sending functions.
  • the transceiver may be a transceiver circuit, an interface, or an interface circuit.
  • the transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated.
  • the above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.
  • the processor 601 may store a computer program, which runs on the processor 601 and enables the communication device 60 to perform the method described in the above method embodiment.
  • the computer program may be fixed in the processor 601, in which case the processor 601 may be implemented by hardware.
  • the communication device 60 may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiments.
  • the processor and transceiver described in the present disclosure may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc.
  • the processor and transceiver may also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.
  • CMOS complementary metal oxide semiconductor
  • NMOS N-type metal oxide semiconductor
  • PMOS P-type metal oxide semiconductor
  • BJT bipolar junction transistor
  • BiCMOS bipolar CMOS
  • SiGe silicon germanium
  • GaAs gallium arsenide
  • the communication device described in the above embodiments may be a network device or a terminal device, but the scope of the communication device described in the present disclosure is not limited thereto, and the structure of the communication device may not be limited by FIG. 6.
  • the communication device may be an independent device or may be part of a larger device.
  • the communication device may be:
  • the IC set may also include a storage component for storing data and computer programs;
  • ASIC such as modem
  • the communication device can be a chip or a chip system
  • the communication device can be a chip or a chip system
  • the chip shown in Figure 7 includes a processor 701 and an interface 702.
  • the number of processors 701 can be one or more, and the number of interfaces 702 can be multiple.
  • Interface 702 is used to receive at least one first message sent by at least one relay UE; obtain SL-RSRP and/or SD-RSRP between the first UE and at least one relay UE respectively; processor 701 is used to select a target relay UE from at least one relay UE based on the obtained SL-RSRP or SD-RSRP and a predefined threshold.
  • the processor 701 is specifically used to: determine at least one candidate relay UE from at least one relay UE based on the acquired SL-RSRP or SD-RSRP and a predefined threshold; select a candidate relay UE from the at least one candidate relay UE to be determined as the target relay UE.
  • the predefined threshold includes a first predefined threshold and/or a second predefined threshold, wherein the first predefined threshold is a minimum threshold and the second predefined threshold is a maximum threshold.
  • the predefined threshold is a first predefined threshold
  • the processor 701 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold, and determine one or more relay UEs that meet the first candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the first candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the first candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one lag parameter value of the first predefined threshold.
  • the predefined threshold is a second predefined threshold; the processor 701 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the second predefined threshold, and determine one or more relay UEs that meet the second candidate relay selection condition from at least one relay UE; determine one or more relay UEs that meet the second candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the second candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is less than at least one lag parameter value of the second predefined threshold.
  • the predefined threshold includes a first predefined threshold and a second predefined threshold; the processor 701 is specifically used to: compare the acquired SL-RSRP or SD-RSRP with the first predefined threshold and the second predefined threshold, and determine one or more relay UEs that meet the third candidate relay selection condition from at least one relay UE; determine the one or more relay UEs that meet the third candidate relay selection condition as at least one candidate relay UE; wherein the one or more relay UEs that meet the third candidate relay selection condition include: one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than or equal to the first predefined threshold and less than or equal to the second predefined threshold; or, one or more relay UEs whose SL-RSRP or SD-RSRP with the first UE is greater than at least one hysteresis parameter value of the first predefined threshold and less than at least one hysteresis parameter value of the second predefined threshold.
  • the processor 701 is specifically used to: select a candidate relay UE with the highest SL-RSRP or SD-RSRP between it and the first UE from at least one candidate relay UE to determine it as the target relay UE; or randomly select a candidate relay UE from at least one candidate relay UE to determine it as the target relay UE.
  • the processor 701 is also used to: in response to at least one relay UE not being a candidate relay UE, select, from at least one relay UE, a relay UE having the highest SL-RSRP or SD-RSRP with the first UE as a target relay UE, or randomly select one relay UE from at least one relay UE as a target relay UE.
  • At least one first message sent by at least one relay UE is at least one notification message broadcast by at least one relay UE; the first UE is a nearby terminal device.
  • At least one first message sent by at least one relay UE is at least one discovery request message forwarded by at least one relay UE; and the first UE is a target remote UE.
  • the processor 701 is further used for: based on the discovery request message forwarded by the target relay UE, the target remote UE generates a discovery response message; the interface 702 is further used for: the target remote UE forwards the discovery response message through the target relay UE.
  • At least one first message sent by at least one relay UE is at least one discovery response message forwarded by at least one relay UE; and the first UE is a source remote UE.
  • Interface 702 is used to send a first message to the first UE; the first message is used to assist the first UE to determine whether to select the second UE as the target relay UE based on the acquired sidelink reference signal received power SL-RSRP or sidelink discovery reference signal received power SD-RSRP between the first UE and the second UE, and a predefined threshold.
  • the first message is a notification message broadcast by the second UE; the first UE is a nearby terminal device.
  • the first message is a discovery request message forwarded by the second UE; the first UE is a target remote UE.
  • the first message is a discovery response message forwarded by the second UE; the first UE is a source remote UE.
  • the chip further includes a memory 703, and the memory 703 is used to store necessary computer programs and data.
  • An embodiment of the present disclosure also provides a relay UE selection system for a terminal device UE to UE relay scenario, the system includes a communication device as a first UE and a communication device as a relay UE in the embodiment of FIG. 5 above, or the system includes a communication device as a first UE and a communication device as a relay UE in the embodiment of FIG. 6 above.
  • the present disclosure also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.
  • the present disclosure also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.
  • the computer program product includes one or more computer programs.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer program can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer program can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.
  • a magnetic medium e.g., a floppy disk, a hard disk, a magnetic tape
  • an optical medium e.g., a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD solid state disk
  • At least one in the present disclosure may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present disclosure.
  • the technical features in the technical feature are distinguished by “first”, “second”, “third”, “A”, “B”, “C” and “D”, etc., and there is no order of precedence or size between the technical features described by the "first”, “second”, “third”, “A”, “B”, “C” and “D”.
  • the corresponding relationships shown in the tables in the present disclosure can be configured or predefined.
  • the values of the information in each table are only examples and can be configured as other values, which are not limited by the present disclosure.
  • the corresponding relationships shown in some rows may not be configured.
  • appropriate deformation adjustments can be made based on the above table, such as splitting, merging, etc.
  • the names of the parameters shown in the titles of the above tables can also use other names that can be understood by the communication device, and the values or representations of the parameters can also be other values or representations that can be understood by the communication device.
  • other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables.
  • the predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

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Abstract

一种用于终端设备UE到UE中继场景的中继UE选择方法，其中，该方法由第一UE执行，该方法包括：接收至少一个中继UE发送的至少一个第一消息；获取第一UE分别与至少一个中继UE之间的侧行链路参考信号接收功率SL-RSRP和/或侧行链路发现参考信号接收功率SD-RSRP；根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE。第一UE可以根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在多个中继UE中选择合适的目标中继UE的问题。

Description

用于终端设备UE到UE中继场景的中继UE选择方法及其装置 技术领域
本公开涉及通信技术领域，尤其涉及一种用于终端设备UE到UE中继场景的中继UE选择方法及其装置。
背景技术
相关技术中，终端设备UE A可以不直接与UE B连接，而通过UE C的中继实现与UE B的连接。其中提供中继功能的UE C为中继UE，上述连接的UE之间通过侧链路sidelink单播通信，这种架构称为U2U(UE to UE)中继。U2U场景中可能同时存在能够为UE A和UE B提供中继功能的多个中继UE，此时就需要从多个中继UE中确定出合适的目标中继UE，以使UE A和UE B通过该目标中继UE进行通信。
但是，目前尚缺乏用于U2U场景中确定出合适中继UE的有效手段。
发明内容
本公开实施例提供一种用于终端设备UE到UE中继场景的中继UE选择方法及其装置，可以应用于车联网，例如车与任何事物(vehicle to everything，V2X)通信、车间通信长期演进技术(long term evolution-vehicle，LTE-V)、车辆与车辆(vehicle to vehicle，V2V)通信等，或可以用于智能驾驶，智能网联车等领域，通过获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
第一方面，本公开实施例提供一种用于终端设备UE到UE中继场景的中继UE选择方法，所述方法由第一UE执行，所述方法包括：接收至少一个中继UE发送的至少一个第一消息；获取所述第一UE分别与所述至少一个中继UE之间的侧行链路参考信号接收功率SL-RSRP和/或侧行链路发现参考信号接收功率SD-RSRP；根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中选择目标中继UE。
在该技术方案中，第一UE可以根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
在一种实现方式中，所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中选择目标中继UE，包括：根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE；从所述至少一个候选中继UE之中选择一个候选中继UE确定为所述目标中继UE。
在一种可选地实现方式中，所述预定义门限包括第一预定义门限和/或第二预定义门限，其中，所述第一预定义门限为最低门限，所述第二预定义门限为最高门限。
可选地，其特征在于，所述预定义门限为所述第一预定义门限；所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：将获取到的所述SL-RSRP或所述SD-RSRP与所述第一预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；将所述满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，所述满足第一候选中继选择条件的一个或多个中继UE，包括：与所述第一UE之间的SL-RSRP或SD-RSRP大于或等于所述第一预定义门限的一个或多个中继UE；或者，与所述第一UE之间的SL-RSRP或SD-RSRP大于所述第一预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，所述预定义门限为所述第二预定义门限；所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：将获取到的所述SL-RSRP或所述SD-RSRP与所述第二预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；将所述满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，所述满足第二候选中继选择条件的一个或多个中继UE，包括：与所述第一UE之间的SL-RSRP或SD-RSRP小于或等于所述第二预定义门限的一个或多个中继UE；或者，与所述第一UE之间的SL-RSRP或SD-RSRP小于所述第二预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，所述预定义门限包括所述第一预定义门限和所述第二预定义门限；所述根据获取到的所述 SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：将获取到的所述SL-RSRP或所述SD-RSRP与所述第一预定义门限和所述第二预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；将所述满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，所述满足第三候选中继选择条件的一个或多个中继UE，包括：与所述第一UE之间的SL-RSRP或SD-RSRP大于或等于所述第一预定义门限且小于或等于所述第二预定义门限的一个或多个中继UE；或者，与所述第一UE之间的SL-RSRP或SD-RSRP大于所述第一预定义门限至少一个滞后参数值且小于所述第二预定义门限至少一个滞后参数值的一个或多个中继UE。
在一种可选地实现方式中，所述从所述至少一个候选中继UE之中选择一个候选中继UE确定为所述目标中继UE，包括：从所述至少一个候选中继UE之中，选择与所述第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为所述目标中继UE；或者，从所述至少一个候选中继UE之中随机选择一个候选中继UE确定为所述目标中继UE。
在一种可选地实现方式中，所述方法还包括：响应于所述至少一个中继UE均不是所述候选中继UE，从所述至少一个中继UE之中，选择与所述第一UE之间的SL-RSRP或SD-RSRP最高的中继UE确定为所述目标中继UE，或者，从所述至少一个中继UE之中随机选择一个中继UE确定为所述目标中继UE。
在一种实现方式中，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE广播的至少一个通知消息；所述第一UE为临近终端设备。
在一种实现方式中，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE转发的至少一个发现请求消息；所述第一UE为目标远端UE。
在一种可选地实现方式中，所述方法还包括：基于所述目标中继UE转发的发现请求消息，所述目标远端UE生成发现响应消息；所述目标远端UE通过所述目标中继UE转发所述发现响应消息。
在一种实现方式中，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE转发的至少一个发现响应消息；所述第一UE为源远端UE。
第二方面，本公开实施例提供一种用于终端设备UE到UE中继场景的中继UE选择方法，所述方法由第二UE执行，所述第二UE为所述UE到UE中继场景中的中继UE，所述方法包括：向第一UE发送第一消息；所述第一消息用于辅助所述第一UE根据获取到的与所述第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择所述第二UE为目标中继UE。
在一种实现方式中，所述第一消息为所述第二UE广播的通知消息；所述第一UE为临近终端设备。
在一种实现方式中，所述第一消息为所述第二UE转发的发现请求消息；所述第一UE为目标远端UE。
在一种实现方式中，所述第一消息为所述第二UE转发的发现响应消息；所述第一UE为源远端UE。在该技术方案中，第二UE可以向第一UE发送第一消息，使第一UE能够基于第一消息从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
第三方面，本公开实施例提供一种通信装置，所述装置包括：收发模块，用于接收至少一个中继UE发送的至少一个第一消息；获取第一UE分别与至少一个中继UE之间的SL-RSRP和/或SD-RSRP；处理模块，用于根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE。在一种实现方式中，处理模块具体用于：根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE；从至少一个候选中继UE之中选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，预定义门限包括第一预定义门限和/或第二预定义门限，其中，第一预定义门限为最低门限，第二预定义门限为最高门限。
可选地，预定义门限为第一预定义门限；处理模块具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限进行大小比较，从至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；将满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第一候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限为第二预定义门限；处理模块具体用于：将获取到的SL-RSRP或SD-RSRP与第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；将满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第二候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP小 于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限包括第一预定义门限和第二预定义门限；处理模块具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；将满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第三候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限且小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值且小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
在一种可选地实现方式中，处理模块具体用于：从至少一个候选中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为目标中继UE；或者，从至少一个候选中继UE之中随机选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，处理模块还用于：响应于至少一个中继UE均不是候选中继UE，从至少一个中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的中继UE确定为目标中继UE，或者，从至少一个中继UE之中随机选择一个中继UE确定为目标中继UE。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE广播的至少一个通知消息；第一UE为临近终端设备。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现请求消息；第一UE为目标远端UE。
在一种可选地实现方式中，处理模块还用于：基于目标中继UE转发的发现请求消息，目标远端UE生成发现响应消息；收发模块还用于：目标远端UE通过目标中继UE转发发现响应消息。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现响应消息；第一UE为源远端UE。
第四方面，本公开实施例提供一种通信装置，所述装置包括：收发模块，用于向第一UE发送第一消息；所述第一消息用于辅助所述第一UE根据获取到的与所述第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择所述第二UE为目标中继UE。
在一种实现方式中，所述第一消息为所述第二UE广播的通知消息；所述第一UE为临近终端设备。
在一种实现方式中，所述第一消息为所述第二UE转发的发现请求消息；所述第一UE为目标远端UE。
在一种实现方式中，所述第一消息为所述第二UE转发的发现响应消息；所述第一UE为源远端UE。
第五方面，本公开实施例提供一种通信装置，该通信装置包括处理器，当该处理器调用存储器中的计算机程序时，执行上述第一方面所述的方法。
第六方面，本公开实施例提供一种通信装置，该通信装置包括处理器，当该处理器调用存储器中的计算机程序时，执行上述第二方面所述的方法。
第七方面，本公开实施例提供一种通信装置，该通信装置包括处理器和存储器，该存储器中存储有计算机程序；所述处理器执行该存储器所存储的计算机程序，以使该通信装置执行上述第一方面所述的方法。
第八方面，本公开实施例提供一种通信装置，该通信装置包括处理器和存储器，该存储器中存储有计算机程序；所述处理器执行该存储器所存储的计算机程序，以使该通信装置执行上述第二方面所述的方法。
第九方面，本公开实施例提供一种通信装置，该装置包括处理器和接口电路，该接口电路用于接收代码指令并传输至该处理器，该处理器用于运行所述代码指令以使该装置执行上述第一方面所述的方法。
第十方面，本公开实施例提供一种通信装置，该装置包括处理器和接口电路，该接口电路用于接收代码指令并传输至该处理器，该处理器用于运行所述代码指令以使该装置执行上述第二方面所述的方法。
第十一方面，本公开实施例提供一种用于终端设备UE到UE中继场景的中继UE选择系统，该系统包括第三方面所述的通信装置以及第四方面所述的通信装置，或者，该系统包括第五方面所述的通信装置以及第六方面所述的通信装置，或者，第七方面所述的通信装置以及第八方面所述的通信装置，或者，第九方面所述的通信装置以及第十方面所述的通信装置。
第十二方面，本发明实施例提供一种计算机可读存储介质，用于储存为上述终端设备所用的指令，当所述指令被执行时，使所述终端设备执行上述第一方面所述的方法。
第十三方面，本发明实施例提供一种计算机可读存储介质，用于储存为上述终端设备所用的指令，当所述指令被执行时，使所述终端设备执行上述第二方面所述的方法。
第十四方面，本公开还提供一种包括计算机程序的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面所述的方法。
第十五方面，本公开还提供一种包括计算机程序的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第二方面所述的方法。
第十六方面，本公开提供一种芯片系统，该芯片系统包括至少一个处理器和接口，用于支持终端设备实现第一方面所涉及的功能，例如，确定或处理上述方法中所涉及的数据和信息中的至少一种。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存终端设备必要的计算机程序和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
第十七方面，本公开提供一种芯片系统，该芯片系统包括至少一个处理器和接口，用于支持终端设备实现第二方面所涉及的功能，例如，确定或处理上述方法中所涉及的数据和信息中的至少一种。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存终端设备必要的计算机程序和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
第十八方面，本公开提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述第一方面所述的方法。
第十九方面，本公开提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述第二方面所述的方法。
附图说明
为了更清楚地说明本公开实施例或背景技术中的技术方案，下面将对本公开实施例或背景技术中所需要使用的附图进行说明。
图1是本公开实施例提供的一种通信系统的架构示意图；
图2是本公开实施例提供的一种用于终端设备UE到UE中继场景的中继UE选择方法的流程示意图；
图3是本公开实施例提供的另一种用于终端设备UE到UE中继场景的中继UE选择方法的流程示意图；
图4是本公开实施例提供的又一种用于终端设备UE到UE中继场景的中继UE选择方法的流程示意图；
图5是本公开实施例提供的一种通信装置的结构示意图；
图6是本公开实施例提供的另一种通信装置的结构示意图；
图7是本公开实施例提供的一种芯片的结构示意图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。其中，在本公开的描述中，除非另有说明，“/”表示或的意思，例如，A/B可以表示A或B；本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
针对U2U(UE to UE，终端设备到终端设备)场景，目前有model A和model B两种发现请求消息的发送模式。model A模式中，一个或者多个中继UE周期性广播通知消息，该通知消息里携带目标远端终端的地址，源远端终端可以监听该通知消息。model B模式中，一个或者多个中继UE转发源远端终端发送的发现请求消息。对于Model A，由于源远端终端可能收到多个中继UE的通知消息，因此源远端终端需要在多个中继UE中确定出合适的目标中继UE。对于model B，由于目标远端终端可能收到多个中继UE转发的发现请求消息，因此目标远端终端需要在多个中继UE中确定出合适的目标中继UE。
为了更好的理解本公开实施例公开的一种用于终端设备UE到UE中继场景的中继UE选择方法，下面首先对本公开实施例适用的通信系统进行描述。
请参见图1，图1是本公开实施例提供的一种通信系统的架构示意图。该通信系统可包括但不限于一个第一UE和一个中继UE，图1所示的设备数量和形态仅用于举例并不构成对本公开实施例的限定，实际应用中可以包括两个或两个以上的第一UE，两个或两个以上的中继UE。图1所示的通信系统以包括第一UE102和中继UE102为例。
需要说明的是，本公开实施例的技术方案可以应用于各种通信系统。例如：长期演进(long term evolution，LTE)系统、第五代(5th generation，5G)移动通信系统、5G新空口(new radio，NR)系 统，或者其他未来的新型移动通信系统等。
本公开实施例中的第一UE101和中继UE102是用户侧的一种用于接收或发射信号的实体，如手机。终端设备也可以称为终端设备(terminal)、用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端设备(mobile terminal，MT)等。终端设备可以是具备通信功能的汽车、智能汽车、手机(mobile phone)、穿戴式设备、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self-driving)中的无线终端设备、远程手术(remote medical surgery)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端设备等等。本公开的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
可以理解的是，本公开实施例描述的通信系统是为了更加清楚的说明本公开实施例的技术方案，并不构成对于本公开实施例提供的技术方案的限定，本领域普通技术人员可知，随着系统架构的演变和新业务场景的出现，本公开实施例提供的技术方案对于类似的技术问题，同样适用。
下面结合附图对本公开所提供的用于终端设备UE到UE中继场景的中继UE选择方法及其装置进行详细地介绍。
请参见图2，图2是本公开实施例提供的一种用于终端设备UE到UE中继场景的中继UE选择方法的流程示意图。该方法由第一UE执行。如图2所示，该方法可以包括但不限于如下步骤：
步骤S201：接收至少一个中继UE发送的至少一个第一消息。
步骤S202：获取第一UE分别与至少一个中继UE之间的SL-RSRP(sidelinkreference signal receiving power，侧行链路参考信号接收功率)和/或SD-RSRP(sidelink-discoveryreference signal receiving power，侧行链路发现参考信号接收功率)。
作为一种示例，第一UE获取与至少一个中继UE之间的SL-RSRP。
作为另一种示例，第一UE获取与至少一个中继UE之间的SD-RSRP。
作为又一种示例，第一UE获取与至少一个中继UE之间的SL-RSRP和SD-RSRP。
步骤S203：根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE。
其中，在本公开的实施例中，上述预定义门限可以由网络侧设备配置，或者，也可以是预先配置的。
作为一种示例，第一UE可以基于网络侧设备发送的专用RRC(radio resource control，无线资源控制)信令或者SIB(signaling in band，带内信令)，获取上述预定义门限。
作为另一种示例，可以预先为不同的RSC(relay service code，中继服务编码)配置不同的预定义门限，中继UE在发送第一消息时可以根据实际情况携带不同的RSC，从而第一UE可以基于第一消息中的RSC选择对应的预定义门限。
通过实施本公开实施例，第一UE可以根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
在本公开实施例的一种实现方式中，第一UE可以根据预先设置的中继选择条件，从至少一个中继UE中确定至少一个候选中继UE，并从至少一个候选中继UE中选择一个候选中继UE确定为目标中继UE。作为一种示例，请参见图3，图3是本公开实施例提供的另一种用于终端设备UE到UE中继场景的中继UE选择方法的流程示意图。该方法由第一UE执行。如图3所示，该方法可以包括但不限于如下步骤：
步骤S301：接收至少一个中继UE发送的至少一个第一消息。
步骤S302：获取第一UE分别与至少一个中继UE之间的SL-RSRP和/或SD-RSRP。
步骤S303：根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE。
在本公开实施例的一种可选地实现方式中，预定义门限包括第一预定义门限和/或第二预定义门限，其中，第一预定义门限为最低门限，第二预定义门限为最高门限。
作为一种示例，预定义门限包括第一预定义门限，该第一预定义门限为SL-RSRP或SD-RSRP的最低门限。
作为另一种示例，预定义门限包括第二预定义门限，该第二预定义门限为SL-RSRP或SD-RSRP的最高门限。
作为又一种示例，预定义门限包括第一预定义门限和第二预定义门限，其中，该第一预定义门限为SL-RSRP或SD-RSRP的最低门限，该第二预定义门限为SL-RSRP或SD-RSRP的最高门限。
可选地，上述预定义门限为第一预定义门限；上述根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE，可以包括以下步骤：将获取到的SL-RSRP或SD-RSRP与第一预定义门限进行大小比较，从至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；将满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第一候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值的一个或多个中继UE。
示例1，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到的每个中继UE对应的SL-RSRP与第一预定义门限进行大小比较，将大于或等于第一预定义门限的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例2，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到的每个中继UE对应的SD-RSRP与第一预定义门限进行大小比较，将大于或等于第一预定义门限的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例3，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例1或者示例2相同的流程。
示例4，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到每个中继UE对应的SL-RSRP与第一预定义门限进行大小比较，将大于第一预定义门限一个预先设置的迟滞(hysteresis)或更大的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例5，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到每个中继UE对应的SD-RSRP与第一预定义门限进行大小比较，将大于或等于第一预定义门限一个预先设置的迟滞或更大的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例6，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例4或者示例5相同的流程。
在本公开实施例的另一种可选地实现方式中，上述预定义门限为第二预定义门限；上述根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE，可以包括以下步骤：将获取到的SL-RSRP或SD-RSRP与第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；将满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第二候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
示例7，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到每个中继UE对应的SL-RSRP与第二预定义门限进行大小比较，将小于或等于第二预定义门限的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例8，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到每个中继UE对应的SD-RSRP与第二预定义门限进行大小比较，将小于或等于第二预定义门限的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例9，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例7或者示例8相同的流程。
示例10，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到每个中继UE对应的SL-RSRP与第二预定义门限进行大小比较，将小于第二预定义门限一个预先设置的迟滞或更小的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例11，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到每个中继UE对应的SD-RSRP与第二预定义门限进行大小比较，将小于第二预定义门限一个预先设置的迟滞或更小的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例12，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例10或者示例11相同的流程。
在本公开实施例的又一种可选地实现方式中，上述预定义门限包括第一预定义门限和第二预定义门 限；上述根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE，可以包括以下步骤：将获取到的SL-RSRP或SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；将满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第三候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限且小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值且小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
需要说明的是，在本公开的实施例中，第一门限对应的滞后参数值和第二门限对应的滞后参数值可以相同也可以不同；大于第一预定义门限至少一个滞后参数值指大于或第一预定义门限一个预先设置的迟滞或更大；小于第二预定义门限至少一个滞后参数值指小于第二预定义门限一个预先设置的迟滞或更小。
示例13，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到每个中继UE对应的SL-RSRP与第一预定义门限和第二预定义门限进行大小比较，将大于或等于第一预定义门限，并且小于或等于第二预定义门限的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例14，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到每个中继UE对应的SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，将大于或等于第一预定义门限，并且小于或等于第二预定义门限的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例15，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例13或者示例14相同的流程。
示例16，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE将获取到每个中继UE对应的SL-RSRP与第一预定义门限和第二预定义门限进行大小比较，将大于第一预定义门限至少一个滞后参数值，并且小于第二预定义门限至少一个滞后参数值的SL-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例17，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE将获取到每个中继UE对应的SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，将大于第一预定义门限至少一个滞后参数值，并且小于第二预定义门限至少一个滞后参数值的SD-RSRP对应的一个或多个中继UE，确定为候选中继UE。
示例18，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，第一UE可以基于实现，从SL-RSRP和SD-RSRP之中随机选择一个，并根据随机选择的结果，执行与上述示例16或者示例17相同的流程。
步骤S303：从至少一个候选中继UE之中选择一个候选中继UE确定为目标中继UE。
举例而言，第一UE从至少一个候选中继UE之中选择通信效率最高的一个，确定为目标中继UE。
在一种可选地实现方式中，从至少一个候选中继UE之中选择一个候选中继UE确定为目标中继UE，包括：从至少一个候选中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为目标中继UE；或者，从至少一个候选中继UE之中随机选择一个候选中继UE确定为目标中继UE。
示例19，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，第一UE选择与该第一UE之间的SL-RSRP最高的候选中继UE确定为目标中继UE。
示例20，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，第一UE选择与该第一UE之间的SD-RSRP最高的候选中继UE确定为目标中继UE。
示例21，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，则第一UE基于上一步骤中第一UE基于实现从SL-RSRP和SD-RSRP之中随机选择的一个，并根据随机选择的结果，执行与上述示例19或者示例20相同的流程。
示例22，第一UE基于实现，从至少一个候选中继UE之中随机选择一个候选中继UE确定为目标中继UE。
通过实施本公开实施例，第一UE可以根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
在本公开的一些实施例中，如果第一UE无法根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE，即所有中继UE对应的SL-RSRP或SD-RSRP 与预定义门限相比都不满足本公开任一实施例的选择条件，则第一UE可以将与第一UE之间的SL-RSRP或SD-RSRP最大的中继UE，确定为目标中继UE；或者，第一终端设备可以基于实现选择出通信效果最好的中继UE或者随机选择一个中继UE。
示例23，以第一UE获取到与至少一个中继UE之间的SL-RSRP为例，如果所有中继UE对应的SL-RSRP与预定义门限相比都不满足本公开任一实施例的选择条件，则第一UE可以将与第一UE之间的SL-RSRP最大的中继UE，确定为目标中继UE。
示例24，以第一UE获取到与至少一个中继UE之间的SD-RSRP为例，如果所有中继UE对应的SL-RSRP与预定义门限相比都不满足本公开任一实施例的选择条件，则第一UE可以将与第一UE之间的SD-RSRP最大的中继UE，确定为目标中继UE。
示例25，以第一UE获取到与至少一个中继UE之间的SL-RSRP和SD-RSRP为例，则第一UE基于上一步骤中第一UE基于实现从SL-RSRP和SD-RSRP之中随机选择的一个，并根据随机选择的结果，执行与上述示例23或者示例24相同的流程。
通过实施本公开实施例，第一终端设备可以在无法根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE时，选择合适的中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
在本公开实施例的一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE广播的至少一个通知消息；第一UE为临近终端设备。
其中，在本公开的实施例中，临近终端设备为UE到UE中继通信场景中与中继UE临近的，需要通过中继UE进行通信的其他UE。
举例而言，临近终端设备将至少一个中继UE广播的至少一个通知消息作为第一消息，采用上述任一实施例的用于终端设备UE到UE中继场景的中继UE选择方法，确定目标中继UE。
在本公开实施例的一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现请求消息；第一UE为目标远端UE。
其中，在本公开的实施例中，目标远端UE指UE到UE中继通信场景中接收数据的远端UE。
举例而言，目标远端UE将一个中继UE转发的至少一个发现请求消息作为第一消息，采用上述任一实施例的用于终端设备UE到UE中继场景的中继UE选择方法，确定目标中继UE。
在一种可选地实现方式中，上述用于终端设备UE到UE中继场景的中继UE选择方法还包括：基于目标中继UE转发的发现请求消息，目标远端UE生成发现响应消息；目标远端UE通过目标中继UE转发发现响应消息。
举例而言，目标远端UE确定目标中继UE后，基于目标中继UE转发的发现请求消息生成发现响应消息，并将该发现响应消息只通过该目标中继UE进行转发。
在本公开实施例的一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现响应消息；第一UE为源远端UE。
其中，在本公开的实施例中，源远端UE指UE到UE中继通信场景中发送数据的远端UE。
举例而言，源远端UE将至少一个中继UE转发的至少一个发现响应消息作为第一消息，采用上述任一实施例的用于终端设备UE到UE中继场景的中继UE选择方法，确定目标中继UE。
可以理解，上述实施例是从第一UE侧描述本公开实施例的失败处理方法的实现方式。本公开实施例还提出了另一种用于终端设备UE到UE中继场景的中继UE选择方法，下面将从中继UE描述方法的实现方式。
请参见图4，图4是本公开实施例提供的又一种用于终端设备UE到UE中继场景的中继UE选择方法，该方法由中继UE执行，如图4所示，该方法可以包括但不限于如下步骤：
步骤S401：向第一UE发送第一消息。
其中，在本公开的实施例中，第一消息用于辅助第一UE根据获取到的与第二UE之间SL-RSRP或SD-RSRP，以及预定义门限，确定是否选择第二UE为目标中继UE，具体实现方式可分别采用本公开的各实施例中的任一种方式实现，本公开实施例并不对此作出限定，也不再赘述。
在一种实现方式中，第一消息为第二UE广播的通知消息；第一UE为临近终端设备。
举例而言，第二UE通过广播的方式向临近终端设备发送通知消息。
在一种实现方式中，第一消息为第二UE转发的发现请求消息；第一UE为目标远端UE。
举例而言，第二UE向目标远端UE转发该第二UE接收到的发现请求消息。
在一种实现方式中，第一消息为第二UE转发的发现响应消息；第一UE为源远端UE。
举例而言，第二UE向源远端UE转发该第二UE接收到的发现响应消息。
通过实施本公开实施例，第二UE可以向第一UE发送第一消息，使第一UE能够基于第一消息从 至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
请参见图5，图5是本公开实施例提供的一种通信装置的结构示意图。图5所示的通信装置50可包括收发模块501和处理模块502。收发模块501可包括发送模块和/或接收模块，发送模块用于实现发送功能，接收模块用于实现接收功能，收发模块501可以实现发送功能和/或接收功能。
通信装置50可以是第一UE，也可以是第一UE中的装置，还可以是能够与第一UE匹配使用的装置。或者，通信装置50可以是第二UE，也可以是第二UE中的装置，还可以是能够与第二UE匹配使用的装置。
通信装置50为第一UE：收发模块501，用于接收至少一个中继UE发送的至少一个第一消息；获取第一UE分别与至少一个中继UE之间的SL-RSRP和/或SD-RSRP；处理模块502，用于根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE。
在一种实现方式中，处理模块502具体用于：根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE；从至少一个候选中继UE之中选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，预定义门限包括第一预定义门限和/或第二预定义门限，其中，第一预定义门限为最低门限，第二预定义门限为最高门限。
可选地，预定义门限为第一预定义门限；处理模块502具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限进行大小比较，从至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；将满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第一候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限为第二预定义门限；处理模块502具体用于：将获取到的SL-RSRP或SD-RSRP与第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；将满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第二候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限包括第一预定义门限和第二预定义门限；处理模块502具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；将满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第三候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限且小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值且小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
在一种可选地实现方式中，处理模块502具体用于：从至少一个候选中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为目标中继UE；或者，从至少一个候选中继UE之中随机选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，处理模块502还用于：响应于至少一个中继UE均不是候选中继UE，从至少一个中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的中继UE确定为目标中继UE，或者，从至少一个中继UE之中随机选择一个中继UE确定为目标中继UE。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE广播的至少一个通知消息；第一UE为临近终端设备。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现请求消息；第一UE为目标远端UE。
在一种可选地实现方式中，处理模块502还用于：基于目标中继UE转发的发现请求消息，目标远端UE生成发现响应消息；收发模块501还用于：目标远端UE通过目标中继UE转发发现响应消息。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现响应消息；第一UE为源远端UE。
通过本公开实施例的装置，第一UE可以根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
通信装置50为第二UE：收发模块501，用于向第一UE发送第一消息；第一消息用于辅助第一UE根据获取到的与第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择第二UE为目标中继UE。
在一种实现方式中，第一消息为第二UE广播的通知消息；第一UE为临近终端设备。
在一种实现方式中，第一消息为第二UE转发的发现请求消息；第一UE为目标远端UE。
在一种实现方式中，第一消息为第二UE转发的发现响应消息；第一UE为源远端UE。
通过本公开实施例的装置，第二UE可以向第一UE发送第一消息，使第一UE能够基于第一消息从至少一个中继UE中选择目标中继UE，从而解决了UE到UE中继场景下第一UE无法在在多个中继UE中选择合适目标中继UE的问题。
请参见图6，图6是本公开实施例提供的另一种通信装置的结构示意图。如图6所示，通信装置60可以是网络设备，也可以是终端设备，也可以是支持网络设备实现上述方法的芯片、芯片系统、或处理器等，还可以是支持终端设备实现上述方法的芯片、芯片系统、或处理器等。该装置可用于实现上述方法实施例中描述的方法，具体可以参见上述方法实施例中的说明。
通信装置60可以包括一个或多个处理器601。处理器601可以是通用处理器或者专用处理器等。例如可以是基带处理器或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、基带芯片，终端设备、终端设备芯片，DU或CU等)进行控制，执行计算机程序，处理计算机程序的数据。
可选的，通信装置60中还可以包括一个或多个存储器602，其上可以存有计算机程序603，处理器601执行所述计算机程序603，以使得通信装置60执行上述方法实施例中描述的方法。可选的，所述存储器602中还可以存储有数据。通信装置60和存储器602可以单独设置，也可以集成在一起。
可选的，通信装置60还可以包括收发器604、天线605。收发器604可以称为收发单元、收发机、或收发电路等，用于实现收发功能。收发器604可以包括接收器和发送器，接收器可以称为接收机或接收电路等，用于实现接收功能；发送器可以称为发送机或发送电路等，用于实现发送功能。
可选的，通信装置60中还可以包括一个或多个接口电路606。接口电路606用于接收代码指令并传输至处理器601。处理器601运行所述代码指令以使通信装置60执行上述方法实施例中描述的方法。
通信装置60为第一UE：处理器601用于执行图2中的步骤S202；执行图3中的步骤S302和步骤S303。收发器604用于执行图2中的步骤S201和图3中的步骤S301；执行图4中的步骤S401。
在一种实现方式中，处理器601中可以包括用于实现接收和发送功能的收发器。例如该收发器可以是收发电路，或者是接口，或者是接口电路。用于实现接收和发送功能的收发电路、接口或接口电路可以是分开的，也可以集成在一起。上述收发电路、接口或接口电路可以用于代码/数据的读写，或者，上述收发电路、接口或接口电路可以用于信号的传输或传递。
在一种实现方式中，处理器601可以存有计算机程序，该计算机程序在处理器601上运行，可使得通信装置60执行上述方法实施例中描述的方法。该计算机程序可能固化在处理器601中，该种情况下，处理器601可能由硬件实现。
在一种实现方式中，通信装置60可以包括电路，所述电路可以实现前述方法实施例中发送或接收或者通信的功能。本公开中描述的处理器和收发器可实现在集成电路(integrated circuit，IC)、模拟IC、射频集成电路RFIC、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)、印刷电路板(printed circuit board，PCB)、电子设备等上。该处理器和收发器也可以用各种IC工艺技术来制造，例如互补金属氧化物半导体(complementary metal oxide semiconductor，CMOS)、N型金属氧化物半导体(nMetal-oxide-semiconductor，NMOS)、P型金属氧化物半导体(positive channel metal oxide semiconductor，PMOS)、双极结型晶体管(bipolar junction transistor，BJT)、双极CMOS(BiCMOS)、硅锗(SiGe)、砷化镓(GaAs)等。
以上实施例描述中的通信装置可以是网络设备或者终端设备，但本公开中描述的通信装置的范围并不限于此，而且通信装置的结构可以不受图6的限制。通信装置可以是独立的设备或者可以是较大设备的一部分。例如所述通信装置可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或子系统；
(2)具有一个或多个IC的集合，可选的，该IC集合也可以包括用于存储数据，计算机程序的存储部件；
(3)ASIC，例如调制解调器(Modem)；
(4)可嵌入在其他设备内的模块；
(5)接收机、终端设备、智能终端设备、蜂窝电话、无线设备、手持机、移动单元、车载设备、网络设备、云设备、人工智能设备等等；
(6)其他等等。
对于通信装置可以是芯片或芯片系统的情况，可参见图7所示的芯片的结构示意图。图7所示的芯片包括处理器701和接口702。其中，处理器701的数量可以是一个或多个，接口702的数量可以是多个。
对于芯片用于实现本公开实施例中第一UE的功能的情况：
接口702，用于接收至少一个中继UE发送的至少一个第一消息；获取第一UE分别与至少一个中继UE之间的SL-RSRP和/或SD-RSRP；处理器701，用于根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中选择目标中继UE。
在一种实现方式中，处理器701具体用于：根据获取到的SL-RSRP或SD-RSRP，以及预定义门限，从至少一个中继UE中确定至少一个候选中继UE；从至少一个候选中继UE之中选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，预定义门限包括第一预定义门限和/或第二预定义门限，其中，第一预定义门限为最低门限，第二预定义门限为最高门限。
可选地，预定义门限为第一预定义门限；处理器701具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限进行大小比较，从至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；将满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第一候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限为第二预定义门限；处理器701具体用于：将获取到的SL-RSRP或SD-RSRP与第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；将满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第二候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
可选地，预定义门限包括第一预定义门限和第二预定义门限；处理器701具体用于：将获取到的SL-RSRP或SD-RSRP与第一预定义门限和第二预定义门限进行大小比较，从至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；将满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；其中，满足第三候选中继选择条件的一个或多个中继UE，包括：与第一UE之间的SL-RSRP或SD-RSRP大于或等于第一预定义门限且小于或等于第二预定义门限的一个或多个中继UE；或者，与第一UE之间的SL-RSRP或SD-RSRP大于第一预定义门限至少一个滞后参数值且小于第二预定义门限至少一个滞后参数值的一个或多个中继UE。
在一种可选地实现方式中，处理器701具体用于：从至少一个候选中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为目标中继UE；或者，从至少一个候选中继UE之中随机选择一个候选中继UE确定为目标中继UE。
在一种可选地实现方式中，处理器701还用于：响应于至少一个中继UE均不是候选中继UE，从至少一个中继UE之中，选择与第一UE之间的SL-RSRP或SD-RSRP最高的中继UE确定为目标中继UE，或者，从至少一个中继UE之中随机选择一个中继UE确定为目标中继UE。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE广播的至少一个通知消息；第一UE为临近终端设备。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现请求消息；第一UE为目标远端UE。
在一种可选地实现方式中，处理器701还用于：基于目标中继UE转发的发现请求消息，目标远端UE生成发现响应消息；接口702还用于：目标远端UE通过目标中继UE转发发现响应消息。
在一种实现方式中，至少一个中继UE发送的至少一个第一消息为至少一个中继UE转发的至少一个发现响应消息；第一UE为源远端UE。
对于芯片用于实现本公开实施例中第二UE的功能的情况：
接口702，用于向第一UE发送第一消息；第一消息用于辅助第一UE根据获取到的与第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择第二UE为目标中继UE。
在一种实现方式中，第一消息为第二UE广播的通知消息；第一UE为临近终端设备。
在一种实现方式中，第一消息为第二UE转发的发现请求消息；第一UE为目标远端UE。
在一种实现方式中，第一消息为第二UE转发的发现响应消息；第一UE为源远端UE。
可选的，芯片还包括存储器703，存储器703用于存储必要的计算机程序和数据。
本领域技术人员还可以了解到本公开实施例列出的各种说明性逻辑块(illustrative logical block)和步骤(step)可以通过电子硬件、电脑软件，或两者的结合进行实现。这样的功能是通过硬件还是软件来实现取决于特定的应用和整个系统的设计要求。本领域技术人员可以对于每种特定的应用，可以使用各种方法实现所述的功能，但这种实现不应被理解为超出本公开实施例保护的范围。
本公开实施例还提供一种用于终端设备UE到UE中继场景的中继UE选择系统，该系统包括前述图5实施例中作为第一UE的通信装置和作为中继UE的通信装置，或者，该系统包括前述图6实施例中作为第一UE的通信装置和作为中继UE的通信装置。
本公开还提供一种可读存储介质，其上存储有指令，该指令被计算机执行时实现上述任一方法实施例的功能。
本公开还提供一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序。在计算机上加载和执行所述计算机程序时，全部或部分地产生按照本公开实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机程序可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以理解：本公开中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本公开实施例的范围，也表示先后顺序。
本公开中的至少一个还可以描述为一个或多个，多个可以是两个、三个、四个或者更多个，本公开不做限制。在本公开实施例中，对于一种技术特征，通过“第一”、“第二”、“第三”、“A”、“B”、“C”和“D”等区分该种技术特征中的技术特征，该“第一”、“第二”、“第三”、“A”、“B”、“C”和“D”描述的技术特征间无先后顺序或者大小顺序。
本公开中各表所示的对应关系可以被配置，也可以是预定义的。各表中的信息的取值仅仅是举例，可以配置为其他值，本公开并不限定。在配置信息与各参数的对应关系时，并不一定要求必须配置各表中示意出的所有对应关系。例如，本公开中的表格中，某些行示出的对应关系也可以不配置。又例如，可以基于上述表格做适当的变形调整，例如，拆分，合并等等。上述各表中标题示出参数的名称也可以采用通信装置可理解的其他名称，其参数的取值或表示方式也可以通信装置可理解的其他取值或表示方式。上述各表在实现时，也可以采用其他的数据结构，例如可以采用数组、队列、容器、栈、线性表、指针、链表、树、图、结构体、类、堆、散列表或哈希表等。
本公开中的预定义可以理解为定义、预先定义、存储、预存储、预协商、预配置、固化、或预烧制。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本公开的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种用于终端设备UE到UE中继场景的中继UE选择方法，其特征在于，所述方法由第一UE执行，所述方法包括：
    接收至少一个中继UE发送的至少一个第一消息；
    获取所述第一UE分别与所述至少一个中继UE之间的侧行链路参考信号接收功率SL-RSRP和/或侧行链路发现参考信号接收功率SD-RSRP；
    根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中选择目标中继UE。
  2. 如权利要求1所述的方法，其特征在于，所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中选择目标中继UE，包括：
    根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE；
    从所述至少一个候选中继UE之中选择一个候选中继UE确定为所述目标中继UE。
  3. 如权利要求2所述的方法，其特征在于，所述预定义门限包括第一预定义门限和/或第二预定义门限，其中，所述第一预定义门限为最低门限，所述第二预定义门限为最高门限。
  4. 如权利要求3所述的方法，其特征在于，所述预定义门限为所述第一预定义门限；所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：
    将获取到的所述SL-RSRP或所述SD-RSRP与所述第一预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第一候选中继选择条件的一个或多个中继UE；
    将所述满足第一候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；
    其中，所述满足第一候选中继选择条件的一个或多个中继UE，包括：
    与所述第一UE之间的SL-RSRP或SD-RSRP大于或等于所述第一预定义门限的一个或多个中继UE；或者，
    与所述第一UE之间的SL-RSRP或SD-RSRP大于所述第一预定义门限至少一个滞后参数值的一个或多个中继UE。
  5. 如权利要求3所述的方法，其特征在于，所述预定义门限为所述第二预定义门限；所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：
    将获取到的所述SL-RSRP或所述SD-RSRP与所述第二预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第二候选中继选择条件的一个或多个中继UE；
    将所述满足第二候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；
    其中，所述满足第二候选中继选择条件的一个或多个中继UE，包括：
    与所述第一UE之间的SL-RSRP或SD-RSRP小于或等于所述第二预定义门限的一个或多个中继UE；或者，
    与所述第一UE之间的SL-RSRP或SD-RSRP小于所述第二预定义门限至少一个滞后参数值的一个或多个中继UE。
  6. 如权利要求3所述的方法，其特征在于，所述预定义门限包括所述第一预定义门限和所述第二预定义门限；所述根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中确定至少一个候选中继UE，包括：
    将获取到的所述SL-RSRP或所述SD-RSRP与所述第一预定义门限和所述第二预定义门限进行大小比较，从所述至少一个中继UE之中确定出满足第三候选中继选择条件的一个或多个中继UE；
    将所述满足第三候选中继选择条件的一个或多个中继UE确定为至少一个候选中继UE；
    其中，所述满足第三候选中继选择条件的一个或多个中继UE，包括：
    与所述第一UE之间的SL-RSRP或SD-RSRP大于或等于所述第一预定义门限且小于或等于所述第二预定义门限的一个或多个中继UE；或者，
    与所述第一UE之间的SL-RSRP或SD-RSRP大于所述第一预定义门限至少一个滞后参数值且小于 所述第二预定义门限至少一个滞后参数值的一个或多个中继UE。
  7. 如权利要求2至6中任一项所述的方法，其特征在于，所述从所述至少一个候选中继UE之中选择一个候选中继UE确定为所述目标中继UE，包括：
    从所述至少一个候选中继UE之中，选择与所述第一UE之间的SL-RSRP或SD-RSRP最高的候选中继UE确定为所述目标中继UE；或者，
    从所述至少一个候选中继UE之中随机选择一个候选中继UE确定为所述目标中继UE。
  8. 如权利要求2至7中任一项所述的方法，其特征在于，还包括：
    响应于所述至少一个中继UE均不是所述候选中继UE，从所述至少一个中继UE之中，选择与所述第一UE之间的SL-RSRP或SD-RSRP最高的中继UE确定为所述目标中继UE，或者，从所述至少一个中继UE之中随机选择一个中继UE确定为所述目标中继UE。
  9. 如权利要求1至8中任一项所述的方法，其特征在于，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE广播的至少一个通知消息；所述第一UE为临近终端设备。
  10. 如权利要求1至8中任一项所述的方法，其特征在于，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE转发的至少一个发现请求消息；所述第一UE为目标远端UE。
  11. 如权利要求10所述的方法，其特征在于，还包括：
    基于所述目标中继UE转发的发现请求消息，所述目标远端UE生成发现响应消息；
    所述目标远端UE通过所述目标中继UE转发所述发现响应消息。
  12. 如权利要求1至8中任一项所述的方法，其特征在于，所述至少一个中继UE发送的至少一个第一消息为所述至少一个中继UE转发的至少一个发现响应消息；所述第一UE为源远端UE。
  13. 一种用于终端设备UE到UE中继场景的中继UE选择方法，其特征在于，所述方法由第二UE执行，所述第二UE为所述UE到UE中继场景中的中继UE，所述方法包括：
    向第一UE发送第一消息；所述第一消息用于辅助所述第一UE根据获取到的与所述第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择所述第二UE为目标中继UE。
  14. 如权利要求13所述的方法，其特征在于，所述第一消息为所述第二UE广播的通知消息；所述第一UE为临近终端设备。
  15. 如权利要求13所述的方法，其特征在于，所述第一消息为所述第二UE转发的发现请求消息；所述第一UE为目标远端UE。
  16. 如权利要求13所述的方法，其特征在于，所述第一消息为所述第二UE转发的发现响应消息；所述第一UE为源远端UE。
  17. 一种通信装置，其特征在于，包括：
    收发模块，用于接收至少一个中继UE发送的至少一个第一消息；
    处理模块，用于获取所述第一UE分别与所述至少一个中继UE之间的侧行链路参考信号接收功率SL-RSRP和/或侧行链路发现参考信号接收功率SD-RSRP；以及根据获取到的所述SL-RSRP或所述SD-RSRP，以及预定义门限，从所述至少一个中继UE中选择目标中继UE。
  18. 一种通信装置，其特征在于，包括：
    收发模块，用于向第一UE发送第一消息；所述第一消息用于辅助所述第一UE根据获取到的与所述第二UE之间侧行链路参考信号接收功率SL-RSRP或侧行链路发现参考信号接收功率SD-RSRP，以及预定义门限，确定是否选择所述第二UE为目标中继UE。
  19. 一种通信装置，其特征在于，所述装置包括处理器和存储器，所述存储器中存储有计算机程序， 所述处理器执行所述存储器中存储的计算机程序，以使所述装置执行如权利要求1至12或13至16中任一项所述的方法。
  20. 一种计算机可读存储介质，用于存储有指令，当所述指令被执行时，使如权利要求1至12或13至16中任一项所述的方法被实现。
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