WO2022121982A1 - 执行侧行通信中继重选的方法及用户设备 - Google Patents

执行侧行通信中继重选的方法及用户设备 Download PDF

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Publication number
WO2022121982A1
WO2022121982A1 PCT/CN2021/136780 CN2021136780W WO2022121982A1 WO 2022121982 A1 WO2022121982 A1 WO 2022121982A1 CN 2021136780 W CN2021136780 W CN 2021136780W WO 2022121982 A1 WO2022121982 A1 WO 2022121982A1
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rsrp
relay
measurement result
period
rsrp measurement
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PCT/CN2021/136780
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English (en)
French (fr)
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刘蕾
刘仁茂
张崇铭
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夏普株式会社
刘蕾
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Publication of WO2022121982A1 publication Critical patent/WO2022121982A1/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
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • 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
    • 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
    • H04W40/125—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality using a measured number of retransmissions as a link metric

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  • the present invention relates to the technical field of wireless communication, and more particularly, the present invention relates to a method for performing sideline communication relay reselection by a user equipment and a corresponding user equipment.
  • the remote UE receives the reference signal by measuring the discovery message (or discovery channel). power to determine whether to trigger relay reselection.
  • the discovery message or discovery channel
  • the remote UE receives the reference signal by measuring the discovery message (or discovery channel). power to determine whether to trigger relay reselection.
  • the NR sidelink relaying research project of version 17 if a PC5 unicast link is established between the remote UE and the relay UE, it is also possible to measure the received power of the reference signal on the unicast link to determine whether triggering is required. Reselection is followed, thereby reducing the power consumption caused by broadcasting or listening to discovery messages to obtain measurement results.
  • the present invention discusses the related problem of how the remote UE determines to trigger relay reselection based on the measurement based on the discovery message or the measurement based on the PC5 unicast link.
  • the purpose of the present invention is to provide a method for triggering relay reselection performed by a remote UE.
  • a method for triggering relay reselection performed by a remote UE the relay reselection being used to reselect a relay UE that provides a sideline communication relay for the remote UE
  • the method includes: when the SL-RSRP measurement configuration between the remote UE and the current relay UE is obtained, performing SL-RSRP measurement to obtain the measurement configuration between the remote UE and the current relay UE SL-RSRP measurement result of line communication; if the SL-RSRP measurement result is acquired within the first given period, then based on the acquired SL-RSRP measurement result, it is judged whether relay reselection should be triggered; If the SL-RSRP measurement result is obtained within the first given period, then: based on the SD-RSRP measurement result of the discovery message transmitted by the candidate relay UE for the remote UE, determine whether relay reselection should be triggered ; or it is determined that relay reselection should be triggered; and when it
  • the first given period is the first timing period from the moment when the SL-RSRP measurement configuration information is acquired, and when the following conditions are met, it is determined that the acquisition is within the first given period:
  • the SL-RSRP measurement result is reached: the SL-RSRP measurement result is acquired before the first timing timeout corresponding to the first timing period.
  • the method further includes: when the SL-RSRP measurement result is acquired, recording the SL-RSRP acquisition time when the SL-RSRP measurement result is acquired.
  • the first given period is a discovery period for discovering candidate relay UEs, and for each discovery period, when the following conditions are met, it is determined that the SL has been acquired within the first given period -RSRP measurement result: the currently recorded acquisition time of the SL-RSRP is within the discovery period.
  • the first given period is a given number of discovery periods, and when the following conditions are met, it is determined that the SL-RSRP measurement result is obtained within the first given period:
  • the judgment result is that the number of times of the currently recorded SL-RSRP acquisition time in the discovery period exceeds the first given number of times ,
  • the first given period is a given number of discovery periods, and when the following conditions are met, it is determined that the SL-RSRP measurement result is not obtained within the first given period:
  • the judgment result is that the number of times the currently recorded SL-RSRP acquisition time is not within the discovery period exceeds the first given time frequency.
  • the method further includes: for each acquired SL-RSRP measurement result, judging the time between the SL-RSRP acquisition time of the SL-RSRP measurement result and the previous acquired SL-RSRP measurement result. Whether the first time interval at the time of obtaining an SL-RSRP exceeds one discovery period, wherein, when any of the following conditions are met, it is determined that the SL-RSRP measurement result is obtained within the first given period: for For each acquired SL-RSRP, the first time interval corresponding to the SL-RSRP does not exceed one discovery period; for each acquired SL-RSRP, determine whether the first time interval corresponding to the SL-RSRP exceeds one discovery period , the judgment result is that the number of times that the first time interval does not exceed one discovery period exceeds the second given number of times,
  • the judgment result is that the number of times the first time interval exceeds one discovery period exceeds the second predetermined number of times.
  • the method further includes: when the SL-RSRP measurement configuration between the remote UE and the current relay UE is obtained, stopping the transmission of the discovery message for discovering the candidate relay UE; If the SL-RSRP measurement result is not obtained at the end of the first given period, the discovery message transmission is started.
  • judging whether to trigger relay reselection includes: if the SL-RSRP measurement result is obtained within a first given period, then when the SL-RSRP measurement result is lower than a first given threshold, determining Relay reselection should be triggered; and/or if the SL-RSRP measurement result is not obtained within the first given period, then when the obtained SD-RSRP is lower than the second given threshold, it is determined as Relay reselection should be triggered.
  • the method further includes: if during the second given period If the SL-RSRP measurement result is obtained, then: stop the execution of discovery message transmission, and/or restart the first given period, to determine again whether the SL-RSRP measurement result is obtained within the first given period. Judging operation, and based on the judgment result to decide whether to trigger relay reselection; and based on the acquired SL-RSRP measurement result, judging whether relay reselection should be triggered, the second given period is from the first The period from the moment the given period ends.
  • the method further includes: if the SL-RSRP measurement result is not obtained within the first given period, starting a second timing, wherein when any of the following conditions are met, it is determined that The SL-RSRP measurement result is acquired within the second given period: the SL-RSRP measurement result is acquired before the second timing expires; the number of times the SL-RSRP measurement result is acquired within the second timing period reached the predetermined number of times.
  • triggering relay reselection includes performing the following actions: starting to transmit a discovery message for the candidate relay UE to search for the candidate relay UE; acquiring SD-RSRP of the discovery message transmitted by the candidate relay UE ; and selecting a candidate relay UE whose SD-RSRP exceeds the third given threshold as a new relay UE.
  • a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method as described above.
  • a method that can save power consumption and can trigger relay reselection in time can be provided.
  • FIG. 1 is a schematic diagram for explaining a remote UE and a relay UE involved in the present invention.
  • FIG. 2 is a flowchart of a method for triggering relay reselection according to Embodiment 1 of the present invention.
  • FIG. 3 is a partial flowchart of a method for triggering relay reselection according to Embodiment 2 of the present invention.
  • FIG. 4 is a flowchart of a method for triggering relay reselection according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • UE User Equipment user equipment
  • RRC Radio Resource Control Radio Resource Control
  • RRC_IDLE RRC idle state
  • Radio Access Network Radio Access Layer
  • SCI Sidelink Control Information, side communication control information
  • RSRP Reference Signal Receiving Power, reference signal receiving power
  • PSCCH Physical Sidelink Control Channel, Physical Sidelink Communication Control Channel
  • PSSCH Physical Sidelink Shared Channel, physical side communication shared channel
  • PDCCH Physical downlink control channel, physical downlink control channel
  • BWP Bandwidth Part, bandwidth fragment
  • DCI Downlink Control Information, downlink control information
  • MIB Master Information Block, the main information block
  • SIB System Information Block, system information block
  • DCI Downlink Control Information, downlink control information
  • DM-RS Dedicated demodulation reference signal, dedicated demodulation reference signal
  • SD-RSRP Sidelink Discovery Reference Signal Received Power, Sidelink Discovery Reference Signal Received Power
  • SL-RSRP Sidelink RSRP, Sidelink Communication Reference Signal Received Power
  • network, base station and RAN can be used interchangeably, and the network can be a long-term evolution LET network, a new radio access technology (New RAT, NR) network, an enhanced long-term evolution eLTE network, or a 3GPP subsequent evolution version other networks as defined in .
  • New RAT new radio access technology
  • eLTE enhanced long-term evolution eLTE network
  • 3GPP subsequent evolution version other networks as defined in .
  • the user equipment UE may refer to the NR device supporting the NR Sidelink relay function described in the background art, or may refer to other types of NR devices or LTE devices.
  • the PC5 interface is an interface for sidelink communication between the UE and the control plane and the user plane.
  • the PC5-RRC connection is an AS layer logical connection between a pair of source layer two IDs and target layer two IDs.
  • FIG. 1 is a schematic diagram for explaining UE-to-UE relay.
  • the UE-to-UE relay is shown in Figure 1.
  • the left and right sides are the remote UEs (the left UE can also be called the source side remote UE, and the right UE can also be called the target side remote UE).
  • the remote UE and the relay UE are respectively connected through the PC5 interface. Since the two remote UEs are far apart or the communication environment is poor, the relay UE needs to relay and forward the signaling and data between the two.
  • Mode A There are two modes found in the Sidelink relay, namely Mode A and Mode B:
  • notify UE and monitor UE Two roles are defined: notify UE and monitor UE. Notify the UE to broadcast discovery notifications periodically, and monitor the UE to read and process the discovery notifications.
  • the discovering UE sends a discovery request, and the discovered UE responds to the discovery request.
  • Discovery notifications, discovery requests, and discovery responses may be collectively referred to as discovery messages.
  • the remote UE if it has selected a relay (relay) UE to provide it with a relay service of sidelink communication, it is determined by measuring the received power of the reference signal to determine whether it is necessary to trigger the reselection of the relay UE. If the discovery relay mode A is adopted, the relay UE periodically broadcasts the discovery notification, and the remote UE monitors the received power of the reference signal of the discovery notification. If the discovery relay mode B is adopted, the remote UE sends a discovery request message, the relay UE replies with a discovery response message, and the remote UE monitors the received power of the reference signal of the discovery response message.
  • the discovery relay mode A the relay UE periodically broadcasts the discovery notification, and the remote UE monitors the received power of the reference signal of the discovery notification. If the discovery relay mode B is adopted, the remote UE sends a discovery request message, the relay UE replies with a discovery response message, and the remote UE monitors the received power of the reference signal of the discovery response message.
  • the AS layer of the remote UE triggers relay reselection .
  • the sending and monitoring period of the discovery message can be configured or pre-configured by the network. If a PC5 unicast link is established between the remote UE and the relay UE, it can also be determined whether the relay UE reselection needs to be triggered by measuring the reference signal received power (SL-RSRP) on the unicast link. The SL-RSRP measurement on the PC5 unicast link is based on the measurement of the DM-RS on the PSSCH channel.
  • the DM-RS is only accompanied by data transmission on the PC5 unicast link, so if the relay UE has no data to send , the remote UE cannot get SL-RSRP.
  • SL-RSRP measurements can be configured by the peer UE or by the network.
  • the discovery message is also transmitted on the PSSCH channel, and the AS layer needs to distinguish between the discovery message and other data. In order to reduce the power consumption caused by broadcasting or monitoring the discovery message to obtain the measurement result, it is possible to determine whether relay reselection is required based on SL-RSRP.
  • the remote UE Since SL-RSRP depends on whether there is data transmission on the unicast link, the data transmission of the relay UE can be aperiodic, the remote UE cannot predict when the relay UE will send data, and the relay UE may not send data for a long time, so the remote UE The UE may not acquire SL-RSRP for a long time. In this case, the remote UE needs to have a way to determine whether to trigger relay reselection based on SL-RSRP measurement instead of triggering relay reselection based on SD-RSRP.
  • the present invention provides a corresponding method, so that power consumption can be saved, and reselection delay can be minimized, thereby avoiding adverse effects on service experience.
  • the present invention describes in detail how the remote UE determines to trigger relay reselection based on SD-RSRP measurement or SL-RSRP measurement based on PC5 unicast link.
  • the steps performed for the user equipment UE include: steps 101 , 103 , and 105 .
  • step 101 when the remote UE receives the SL-RSRP measurement configuration, the remote UE performs one or more of the following actions:
  • the discovery message includes but is not limited to discovery notification, discovery request, and discovery response.
  • the remote UE receives the SL-RSRP measurement configuration in one or more of the following scenarios:
  • the Remote UE and the relay UE After the Remote UE and the relay UE establish a PC5 unicast link, they receive the SL-RSRP measurement configuration configured by the peer UE;
  • the Remote UE receives the SL-RSRP measurement configuration configured by the network, which can be sent to the remote UE through system message broadcast or RRC dedicated signaling;
  • -Remote UE pre-configures SL-RSRP measurement configuration according to the protocol definition.
  • the duration of the T1 timer can be:
  • the remote UE determines whether to trigger relay reselection based on SL-RSRP.
  • step 103 when the remote UE obtains the SL-RSRP measurement result, it restarts the T1 timer. If the SL-RSRP measurement result is lower than a certain threshold, relay reselection is triggered.
  • the action of relay reselection may include one or more of the following:
  • step 105 when the T1 timer expires, the UE performs one or more of the following actions:
  • the remote UE starts broadcasting or listening for discovery messages.
  • the remote UE sends an AS layer message (possible forms include but not limited to: RRC message, MAC CE, physical layer indication, etc.) to the Relay UE to instruct the Relay UE to send a discovery message; for discovery mode A, the Relay UE receives After the indication message arrives, a discovery notification message is sent; for discovery mode B, the Relay UE sends a discovery response message after receiving the indication message.
  • AS layer message possibly forms include but not limited to: RRC message, MAC CE, physical layer indication, etc.
  • the Remote UE sends an AS layer message (possible forms include but not limited to: RRC message, MAC CE, physical layer indication, etc.) to the Relay UE to instruct the Relay UE to send data or a response; the Relay UE receives the indication message Then send AS layer data (optionally, the data is normal data or null data) or AS layer response message.
  • AS layer message possibly forms include but not limited to: RRC message, MAC CE, physical layer indication, etc.
  • the remote UE searches for candidate sideline communication relay UEs
  • the remote UE applies layer 3 filtering to the SD-RSRP measurement result
  • the remote UE selects a candidate sideline communication relay UE whose SD-RSRP exceeds a certain threshold value as the relay UE;
  • the remote UE triggers relay reselection, and the relay reselection includes selecting a candidate sideline communication relay whose SD-RSRP exceeds a certain threshold
  • the UE acts as a relay UE.
  • the relay reselection can be directly triggered; or after the T1 timer expires, it starts broadcasting or monitoring the discovery message, and then judges whether to trigger the relay reselection according to SD-RSRP.
  • the steps performed for the user equipment UE include: steps 201 and 203 .
  • step 201 when the timer T1 times out, the T2 timer is started.
  • the duration of the T2 timer can be:
  • step 203 while the T2 timer is running:
  • the remote UE obtains the SL-RSRP measurement result
  • the T2 timer is stopped, and the remote UE performs one or more of the following actions: optionally, start the T1 timer; optionally, stop broadcasting or Listen for discovery messages.
  • the T2 timer when the T2 timer is running, if the number of SL-RSRP measurement results obtained continuously by the remote UE exceeds a threshold, the T2 timer is stopped, and the remote UE performs one or more of the following actions: Optionally, start the T1 timer; optionally, stop broadcasting or monitor the discovery message.
  • the steps performed for the user equipment UE include: steps 301 , 303 , 305 , and 307 .
  • step 301 when the remote UE obtains the SL-RSRP measurement result, it records the first SL-RSRP time information (SL-RSRP acquisition time), and the recorded first SL-RSRP time information may be:
  • the relative time at which the SL-RSRP measurement result is obtained includes one or more of the following: a radio frame number, a subframe number, a time slot number, and the like.
  • step 303
  • the remote UE checks the first SL-RSRP time information (ie, the currently recorded SL-RSRP acquisition moment).
  • the broadcast or monitoring of the discovery message is stopped, and the remote UE determines whether to trigger relay reselection based on the SL-RSRP.
  • the counter C1 is incremented by 1 (the initial value of C1 is 0). If the counter C1 exceeds a certain threshold value, the counter C1 is cleared, the broadcast or monitoring of the discovery message is stopped, and the remote UE determines whether to trigger relay reselection based on SL-RSRP.
  • the counter C2 is incremented by 1 (the initial value of C2 is 0).
  • the remote UE first checks the stored first SL-RSRP time information for acquiring the previous SL-RSRP.
  • the broadcast or monitoring of the discovery message is stopped, and the remote UE determines whether to trigger relay reselection based on SL-RSRP.
  • the counter C1 is incremented by 1 (the initial value of C1 is 0). If the counter C1 exceeds a certain threshold value, the counter C1 is cleared, the broadcast or monitoring of the discovery message is stopped, and the remote UE determines whether to trigger relay reselection based on SL-RSRP.
  • the counter C2 is incremented by 1 (the initial value of C2 is 0).
  • the discovery message includes but is not limited to discovery notification, discovery request, and discovery response.
  • step 305 if the SL-RSRP measurement result is lower than a certain threshold, relay reselection is triggered.
  • the action of relay reselection may include one or more of the following:
  • step 307 when the counter C2 exceeds a certain threshold, the remote UE clears the counter C2, and other actions performed by the UE are the same as in step 105.
  • relay reselection can be directly triggered; or when the counter C2 exceeds a certain threshold value, it starts broadcasting or monitors the discovery message, and then judges whether to trigger relay reselection according to SD-RSRP.
  • FIG. 5 is a schematic structural block diagram of the user equipment UE involved in the present invention.
  • the user equipment UE 500 includes a processor 501 and a memory 502.
  • the processor 501 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 502 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • the memory 502 has program instructions stored thereon. When the instructions are executed by the processor 501, the above-mentioned method described in detail in the present invention and executed by the user equipment can be executed.
  • a program running on a device may be a program that causes a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called "computer system” as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that dynamically stores a program for a short period of time, or any other recording medium readable by a computer.
  • circuits eg, monolithic or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a result of advances in semiconductor technology to replace existing integrated circuits, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the above-described embodiments. Although various examples of the described embodiments have been described, the invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

一种由远端UE执行的触发中继重选的方法和用户设备。中继重选用于重新选择为远端UE提供侧行通信中继的中继UE，方法包括：在获取到远端UE与当前中继UE之间的SL-RSRP测量配置时，进行SL-RSRP测量，以获取远端UE与当前中继UE之间的侧行通信的SL-RSRP测量结果；如果在第一给定期间内获取到了SL-RSRP测量结果，则基于所获取的SL-RSRP测量结果，判断是否应当触发中继重选；如果未在第一给定期间内获取到SL-RSRP测量结果，则：基于候选中继UE针对远端UE传输的发现消息的SD-RSRP测量结果，判断是否应当触发中继重选；或判定为应当触发中继重选；以及在判定为应当触发中继重选时，触发中继重选。

Description

执行侧行通信中继重选的方法及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及由用户设备执行侧行通信中继重选的方法以及相应的用户设备。
背景技术
2018年6月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#80全会上，版本16基于5G NR网络技术的V2X可行性研究课题(参见非专利文献：RP-181480，New SID Proposal:Study on NR V2X)获得批准。版本16的NR V2X包含的主要功能为支持无网络覆盖和有网络覆盖场景下的单播、组播和广播。
2019年12月，RAN#86次全会上，针对版本17的NR sidelink relaying(侧行通信中继)的研究项目被提出(参见非专利文献：RP-193253 New Study Item on NR Sidelink Relaying)，并获批准。该研究项目的最新版本参见非专利文献：RP-201474 reivsed SID NR sidelink relay。该研究项目主要研究UE(用户设备)到网络和UE到UE的中继解决方案，用于扩展基于侧行通信的覆盖。该研究项目的目标之一是支持侧行通信中继的选择和重选。
在现有的中继架构中，远端(remote)UE已经选择了一个中继(relay)UE为其提供侧行通信的中继服务后，通过测量发现消息(或发现信道)的参考信号接收功率，判断是否需要触发中继重选。在版本17的NR sidelink relaying研究项目中，如果远端UE和中继UE之间建立了PC5单播链路，也可以通过测量该单播链路上参考信号的接收功率来判断是否需要触发中继重选，从而减少由广播或者监听发现消息以获取测量结果所产生的功率消耗。
本发明讨论远端UE如何判断基于发现消息的测量或者基于PC5单播链路的测量来触发中继重选的相关问题。
发明内容
本发明的目的在于提供一种由远端UE执行的触发中继重选的方法。
根据本发明的一个方面，提供由远端UE执行的触发中继重选的方法，所述中继重选用于重新选择为所述远端UE提供侧行通信中继的中继UE，所述方法包括：在获取到所述远端UE与当前中继UE之间的SL-RSRP测量配置时，进行SL-RSRP测量，以获取所述远端UE与所述当前中继UE之间的测行通信的SL-RSRP测量结果；如果在第一给定期间内获取到了所述SL-RSRP测量结果，则基于所获取的SL-RSRP测量结果，判断是否应当触发中继重选；如果未在所述第一给定期间内获取到所述SL-RSRP测量结果，则：基于候选中继UE针对所述远端UE传输的发现消息的SD-RSRP测量结果，判断是否应当触发中继重选；或判定为应当触发中继重选；以及在判定为应当触发中继重选时，触发中继重选。
可选的，所述第一给定期间是自获取到所述SL-RSRP测量配置信息的时刻起的第一定时期间，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：在对应于第一定时期间的第一定时超时前获取到了所述SL-RSRP测量结果。
可选的，所述方法还包括：在获取到所述SL-RSRP测量结果时，记录获取到所述SL-RSRP测量结果的SL-RSRP获取时刻。其中，所述第一给定期间是用于发现候选中继UE的一个发现周期，针对每个发现周期，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：当前被记录的所述SL-RSRP获取时刻在该发现周期内。
可选的，所述第一给定期间是给定个数的发现周期，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：在针对每个发现周期判断当前被记录的所述SL-RSRP获取时刻是否在该发现周期内时，判断结果为当前被记录的所述SL-RSRP获取时刻在该发现周期内的次数超过第一给定次数，
可选的，所述第一给定期间是给定个数的发现周期，在满足如下条件时，判断为未在所述第一给定期间内获取到所述SL-RSRP测量结果：在针对每个发现周期判断当前被记录的所述SL-RSRP获取时刻是否在该发现周期内时，判断结果为当前被记录的所述SL-RSRP获取时刻不在该发现周期内的次数超过第一给定次数。
可选的，所述方法还包括：针对每次获取到的所述SL-RSRP测量结果，判断该SL-RSRP测量结果的SL-RSRP获取时刻与前一次获取到的 SL-RSRP测量结果的前一SL-RSRP获取时刻的第一时间间隔是否超过一个发现周期，其中，在满足如下的任一条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：针对每次获取的SL-RSRP，该SL-RSRP对应的第一时间间隔不超过一个发现周期；在针对每次获取的SL-RSRP，判断该SL-RSRP对应的第一时间间隔是否超过一个发现周期时，判断结果为所述第一时间间隔不超过一个发现周期的次数超过第二给定次数，
可选的，在满足如下的条件时，判断为未在所述第一给定期间内获取到所述SL-RSRP测量结果：在针对每次获取的SL-RSRP，判断该SL-RSRP对应的第一时间间隔是否超过一个发现周期时，判断结果为所述第一时间间隔超过一个发现周期的次数超过第二给定次数。
可选的，所述方法还包括：在获取到所述远端UE与当前中继UE之间的SL-RSRP测量配置时，停止用于发现候选中继UE的发现消息传输；以及如果在所述第一给定期间结束时未获取到所述SL-RSRP测量结果，则开始进行所述发现消息传输。
可选的，判断是否触发中继重选包括：如果在第一给定期间内获取到了所述SL-RSRP测量结果，则在所述SL-RSRP测量结果低于第一给定阈值时，判定为应当触发中继重选；和/或如果未在第一给定期间内获取到所述SL-RSRP测量结果，则在所获取到的SD-RSRP低于第二给定阈值时，判定为应当触发中继重选。
可选的，在基于候选中继UE针对所述远端UE传输的发现消息的SD-RSRP测量结果，判断是否应当触发中继重选时，所述方法还包括：如果在第二给定期间内，获取到了SL-RSRP测量结果，则：停止执行发现消息传输，和/或重启所述第一给定期间，以再次进行判定是否在第一给定期间内获取到SL-RSRP测量结果的判断操作，并基于判断结果来决定是否触发中继重选；以及基于所获取到的SL-RSRP测量结果，判断是否应当触发中继重选，所述第二给定期间是从所述第一给定期间结束的时刻起的期间。
可选的，所述方法还包括：如果未在所述第一给定期间内获取到所述SL-RSRP测量结果，则启动第二定时，其中，在满足如下任一条件时，判断为在第二给定期间内获取到了SL-RSRP测量结果：在所述第二定时超时前获取到了SL-RSRP测量结果；在所述第二定时期间内，获取到所述SL-RSRP测量结果的次数达到预定次数。
可选的，触发中继重选包括执行以下动作：开始进行针对候选中继UE的发现消息传输，以搜索所述候选中继UE；获取所述候选中继UE传输的发现消息的SD-RSRP；以及选择SD-RSRP超过第三给定阈值的候选中继UE作为新的中继UE。
根据本发明的另一方面，提供一种用户设备，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行如上所述的方法。
根据本发明的方法，能够提供一种既能节省功耗又能够及时触发中继重选的方法。
附图说明
图1是用于说明本发明涉及的远端UE和中继UE的示意图。
图2是根据本发明的实施例1的触发中继重选的方法的流程图。
图3是根据本发明的实施例2的触发中继重选的方法的部分流程图。
图4是根据本发明的实施例3的触发中继重选的方法的流程图。
图5是本发明涉及的用户设备UE的简要结构框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
下面描述本发明涉及的部分术语，术语的具体含义见3GPP最新标准规范，例如TS38.300、TS38.331、TS36.300、TS36.331等。除非另有指出，本发明中涉及的术语都具有下文的含义。
UE：User Equipment用户设备
NR：New Radio新一代无线技术
RRC：Radio Resource Control无线资源控制
RRC_CONNECTED：RRC连接态
RRC_INACTIVE：RRC非激活态
RRC_IDLE：RRC空闲态
RAN：Radio Access Network，无线接入层
Sidelink:侧行通信
SCI:Sidelink Control Information，侧行通信控制信息
RSRP:Reference Signal Receiving Power，参考信号接收功率
PSCCH:Physical Sidelink Control Channel，物理侧行通信控制信道
PSSCH:Physical Sidelink Shared Channel，物理侧行通信共享信道
AS:Access Stratum，接入层
PDCCH：Physical downlink control channel，物理下行控制信道
BWP:Bandwidth Part，带宽片段
DCI:Downlink Control Information，下行控制信息
DL:Downlink，下行
IE:Information Element，信息元素
CE：Control Element，控制元素
MIB:Master Information Block，主信息块
NR:New Radio，新无线电
SIB:System Information Block，系统信息块
DCI:Downlink Control Information,下行控制信息
DM-RS:Dedicated demodulation reference signal，专有解调参考信号
SD-RSRP:Sidelink Discovery Reference Signal Received Power，侧行通信发现参考信号接收功率
SL-RSRP:Sidelink RSRP，侧行通信参考信号接收功率
本发明中，网络、基站和RAN可互换使用，所述网络可以是长期演进LET网络、新无线访问技术(New RAT，NR)网络、增强的长期演进eLTE网络，也可以是3GPP后续演进版本中定义的其他网络。
本发明中，用户设备UE可以指背景技术中所述的支持NR Sidelink中继功能的NR设备，也可以指其他类型的NR设备或者LTE设备。
PC5接口是UE和UE之间进行控制面和用户面Sidelink通信的接口。对于Sidelink单播，PC5-RRC连接是一对源层二ID和目标层二ID之间的AS层逻辑连接。一个PC5单播链路建立就会对应有一个PC5-RRC连接建立。
图1是用于说明UE-to-UE中继的示意图。UE-to-UE中继如图1所示，左右两侧为远端UE(左侧UE也可以称为源侧远端UE，右侧UE也可以称为目标侧远端UE)，中间为中继UE。远端UE和中继UE之间分别通过PC5接口连接。由于两个远端UE距离较远或者通信环境不佳，需要中继UE对两者间的信令和数据进行中继转发。
在Sidelink中继发现有两种模式，即模式A和模式B：
-模式A相当于“我在这里！”。
其中定义了两个角色：通知UE和监听UE。通知UE周期性地广播发现通知，监听UE读取和处理发现通知。
-模式B相当于“谁在那里？”或者“你在那里吗？”。
其中也定义了两个角色：发现UE和被发现UE。发现UE发送发现请求，被发现UE响应发现请求。
发现通知、发现请求和发现响应可以统称为发现消息。
在现有技术中，如果remote UE已经选择了一个中继(relay)UE为其提供侧行通信的中继服务后，通过测量发现参考信号接收功率判断是否需要触发中继UE重选。如果采用发现中继模式A，relay UE周期性广播发现通知，remote UE监听发现通知的参考信号接收功率。如果采用发现中继模式B，remote UE发送发现请求消息，relay UE回复发现响应消息，remote UE监听发现响应消息的参考信号接收功率。如果当前已经选择的这个relay UE的发现消息的参考信号接收功率(SD-RSRP)低于一个给定的门限值，或者上层判断需要改变中继，则remote UE的AS层触发中继重选。发现消息的发送和监听周期可以网络配置或者预配置。如果远端UE和中继UE之间建立了PC5单播链路，也可以通过测量该单播链路上参考信号的接收功率(SL-RSRP)来判断是否需要触发中继UE重选。PC5单播链路上的SL-RSRP测量是基于对PSSCH信道上的DM-RS的测量，只有当PC5单播链路上有数据传输才伴随有DM-RS，因此如果relay UE没有数据发送时，remote UE无法得到SL-RSRP。SL-RSRP测量可以由对端UE配置或者由网络配置。发现消息也在PSSCH信道上传输，AS层需要区分处理发现消息和其他数据。为了减少广播或者监听发现消息以获取测量结果所产生的功率消耗，可以基于SL-RSRP判断是否需要中继重选。
由于SL-RSRP是依赖于单播链路上是否有数据发送，relay UE的数据发送可以是非周期的，remote UE无法预期relay UE何时会发送数据，relay UE可能长时间不发送数据，因此remote UE可能长时间获取不到SL-RSRP。在这种情况下，remote UE需要有办法确定不再基于SL-RSRP测量触发中继重选，而改为基于SD-RSRP来判断是否触发中继重选。本发明给出了相应的办法，从而可以既节省了功耗，又尽量减少了重选延迟，进而避免对业务体验造成不良影响。
以下，详细描述本发明对remote UE如何判断基于SD-RSRP测量或者基于PC5单播链路的SL-RSRP测量来触发中继重选的若干实施例。
实施例1
如图2所示，在本发明的实施例1中，对于用户设备UE执行的步骤包括：步骤101，103，105。
在步骤101，当remote UE收到SL-RSRP测量配置，remote UE执行动作包括如下一种或者多种：
-启动T1定时器；
-停止广播或者监听发现消息。其中，发现消息包括但不限于发现通知、发现请求、发现响应。
其中，remote UE收到SL-RSRP测量配置可以在如下一种或多种场景下：
-Remote UE和relay UE建立PC5单播链路后，收到对端UE配置的SL-RSRP测量配置；
-Remote UE收到网络配置的SL-RSRP测量配置，该配置可以通过系统消息广播或者RRC专有信令发送给remote UE；
-Remote UE根据协议定义，预配置SL-RSRP测量配置。
T1定时器的时长可以为：
-可选地，为发现周期(discovery period)长度的若干倍数(整数倍或小数倍)；
-可选地，为若干个时隙(slot)；
-可选地，为若干个子帧(subframe)；
-可选地，为若干个无线帧(radio frame)；
-可选地，为若干毫秒；
-可选地，为若干秒。
在T1运行期间，remote UE基于SL-RSRP判断是否触发中继重选。
在步骤103中，当remote UE获取到SL-RSRP测量结果，重启T1定时器。如果SL-RSRP测量结果低于某个门限值，则触发中继重选。
其中，中继重选的动作可以包括如下一种或者多种：
-开始广播或者监听发现消息(对应于“发现消息传输”)；
-搜索候选侧行通信中继UE；
-对SD-RSRP测量结果应用层三滤波；
-选择SD-RSRP超过某一门限值的候选侧行通信中继UE作为中继UE。
在步骤105中，当T1定时器超时，UE执行如下动作的一种或多种：
-可选地，remote UE开始广播或者监听发现消息。
-可选地，remote UE发送一条AS层消息(可能的形式包括但不限于：RRC消息，MAC CE，物理层指示等)给Relay UE指示Relay UE发送发现消息；对于发现模式A，Relay UE收到该指示消息后发送发现通知消息；对于发现模式B，Relay UE收到该指示消息后发送发现响应消息。
-可选地，Remote UE发送一条AS层消息(可能的形式包括但不限于：RRC消息，MAC CE，物理层指示等)给Relay UE指示Relay UE发送数据或者响应；Relay UE收到该指示消息后发送AS层数据(可选地，数据为普通数据或空数据)或者AS层响应消息。
-可选地，remote UE搜索候选侧行通信中继UE；
-可选地，remote UE对SD-RSRP测量结果应用层三滤波；
-可选地，remote UE选择SD-RSRP超过某一门限值的候选侧行通信中继UE作为中继UE；
-可选地，如果SD-RSRP测量结果低于某个门限值，则remote UE触发中继重选，中继重选包括选择SD-RSRP超过某一门限值的候选侧行通信中继UE作为中继UE。
T1定时器超时可以直接触发中继重选；或者T1定时器超时后先开始广播或者监听发现消息，之后根据SD-RSRP判断是否触发中继重选。
实施例2
如图3所示，在本发明的实施例2中，对于用户设备UE执行的步骤包括：步骤201，203。
在步骤201中，基于实施例1，当定时器T1超时后，启动T2定时器。T2定时器的时长可以为：
-可选地，为发现周期(discovery period)长度的若干倍数(整数倍或小数倍)；
-可选地，为若干个时隙(slot)；
-可选地，为若干个子帧(subframe)；
-可选地，为若干个无线帧(radio frame)；
-可选地，为若干毫秒；
-可选地，为若干秒。
在步骤203中，当T2定时器运行期间：
-可选地，如果remote UE获取到SL-RSRP测量结果，则停止T2定时器，则remote UE执行如下动作一种或多种：可选地，启动T1定时器；可选地，停止广播或者监听发现消息。
-可选地，当T2定时器运行期间，如果remote UE连续获取到的SL-RSRP测量结果次数超过一个门限值，则停止T2定时器，则remote UE执行如下动作一种或多种：可选地，启动T1定时器；可选地，停止广播或者监听发现消息。
之后对于T1的相关处理和实施例1相同。
实施例3
如图4所示，在本发明的实施例3中，对于用户设备UE执行的步骤包括：步骤301，303，305，307。
在步骤301中，当remote UE获取到SL-RSRP测量结果，记录第一SL-RSRP时间信息(SL-RSRP获取时刻)，记录的第一SL-RSRP时间信息可以为：
-可选地，获取到SL-RSRP测量结果的绝对时间(如UTC时间，GPS时间等)；
-可选地，获取到SL-RSRP测量结果的相对时间，包括如下一种或者多种：无线帧号，子帧号，时隙号等。
在步骤303中，
-可选地，在每个发现周期，remote UE检查第一SL-RSRP时间信息(即，当前被记录的SL-RSRP获取时刻)。
■可选地，如果第一SL-RSRP时间信息表明获取到SL-RSRP的时间在该发现周期内，则停止广播或者监听发现消息，remote UE基于SL-RSRP判断是否触发中继重选。
■可选地，如果第一SL-RSRP时间信息表明获取到SL-RSRP的时间在该发现周期内，则计数器C1加1(C1初始值为0)。如果计数器C1超过某个门限值，计数器C1清零，停止广播或者监听发现消息，remote UE基于SL-RSRP判断是否触发中继重选。
■可选地，如果第一SL-RSRP时间信息表明获取到SL-RSRP的时间不在该发现周期内，则计数器C2加1(C2初始值为0)。
-可选地，在每次获取到SL-RSRP时，remote UE先检查保存的获取到前一次SL-RSRP的第一SL-RSRP时间信息。
■如果该第一SL-RSRP时间信息距离当前时间的差值不超过一个发现周期，则停止广播或者监听发现消息，remote UE基于SL-RSRP判断是否触发中继重选。
■可选地，如果该第一SL-RSRP时间信息距离当前时间的差值不超过一个发现周期，则计数器C1加1(C1初始值为0)。如果计数器C1超过某个门限值，计数器C1清零，停止广播或者监听发现消息，remote UE基于SL-RSRP判断是否触发中继重选。
■如果该第一SL-RSRP时间信息距离当前时间的差值超过一个发现周期，则计数器C2加1(C2初始化值为0)。
其中，发现消息包括但不限于发现通知、发现请求、发现响应。
在步骤305中，如果SL-RSRP测量结果低于某个门限值，则触发中继 重选。
其中，中继重选的动作可以包括如下一种或者多种：
-开始广播或者监听发现消息；
-搜索候选侧行通信中继UE；
-对SD-RSRP测量结果应用层三滤波；
-选择SD-RSRP超过某一门限值的候选侧行通信中继UE作为中继UE。
在步骤307中，当计数器C2超过某个门限值，remote UE将计数器C2清零，UE执行的其他动作同步骤105。
计数器C2超过某个门限值可以直接触发中继重选；或者计数器C2超过某个门限值后先开始广播或者监听发现消息，之后根据SD-RSRP判断是否触发中继重选。
图5是本发明涉及的用户设备UE的简要结构框图。如图5所示，该用户设备UE 500包括处理器501和存储器502。处理器501例如可以包括微处理器、微控制器、嵌入式处理器等。存储器502例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器502上存储有程序指令。该指令在由处理器501运行时，可以执行本发明详细描述的由用户设备执行的上述方法。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些 程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本发明的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本发明并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本发明的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (10)

  1. 一种由远端UE执行的触发中继重选的方法，所述中继重选用于重新选择为所述远端UE提供侧行通信中继的中继UE，所述方法包括：
    在获取到所述远端UE与当前中继UE之间的SL-RSRP测量配置时，进行SL-RSRP测量，以获取所述远端UE与所述当前中继UE之间的测行通信的SL-RSRP测量结果；
    如果在第一给定期间内获取到了所述SL-RSRP测量结果，则基于所获取的SL-RSRP测量结果，判断是否应当触发中继重选；
    如果未在所述第一给定期间内获取到所述SL-RSRP测量结果，则：基于候选中继UE针对所述远端UE传输的发现消息的SD-RSRP测量结果，判断是否应当触发中继重选；或判定为应当触发中继重选；以及
    在判定为应当触发中继重选时，触发中继重选。
  2. 根据权利要求1所述的方法，其中，所述第一给定期间是自获取到所述SL-RSRP测量配置信息的时刻起的第一定时期间，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：
    在对应于第一定时期间的第一定时超时前获取到了所述SL-RSRP测量结果。
  3. 根据权利要求1所述的方法，还包括：
    在获取到所述SL-RSRP测量结果时，记录获取到所述SL-RSRP测量结果的SL-RSRP获取时刻，其中，
    所述第一给定期间是用于发现候选中继UE的一个发现周期，针对每个发现周期，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：
    当前被记录的所述SL-RSRP获取时刻在该发现周期内，
    或，
    所述第一给定期间是给定个数的发现周期，在满足如下条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：
    在针对每个发现周期判断当前被记录的所述SL-RSRP获取时刻是 否在该发现周期内时，判断结果为当前被记录的所述SL-RSRP获取时刻在该发现周期内的次数超过第一给定次数，
    或，
    所述第一给定期间是给定个数的发现周期，在满足如下条件时，判断为未在所述第一给定期间内获取到所述SL-RSRP测量结果：
    在针对每个发现周期判断当前被记录的所述SL-RSRP获取时刻是否在该发现周期内时，判断结果为当前被记录的所述SL-RSRP获取时刻不在该发现周期内的次数超过第一给定次数。
  4. 根据权利要求1所述的方法，还包括：
    针对每次获取到的所述SL-RSRP测量结果，判断该SL-RSRP测量结果的SL-RSRP获取时刻与前一次获取到的SL-RSRP测量结果的前一SL-RSRP获取时刻的第一时间间隔是否超过一个发现周期，其中，
    在满足如下的任一条件时，判断为在所述第一给定期间内获取到了所述SL-RSRP测量结果：
    针对每次获取的SL-RSRP，该SL-RSRP对应的第一时间间隔不超过一个发现周期；
    在针对每次获取的SL-RSRP，判断该SL-RSRP对应的第一时间间隔是否超过一个发现周期时，判断结果为所述第一时间间隔不超过一个发现周期的次数超过第二给定次数，
    或，
    在满足如下的条件时，判断为未在所述第一给定期间内获取到所述SL-RSRP测量结果：
    在针对每次获取的SL-RSRP，判断该SL-RSRP对应的第一时间间隔是否超过一个发现周期时，判断结果为所述第一时间间隔超过一个发现周期的次数超过第二给定次数。
  5. 根据权利要求1-4中任一项所述的方法，还包括：
    在获取到所述远端UE与当前中继UE之间的SL-RSRP测量配置时，停止用于发现候选中继UE的发现消息传输；以及
    如果在所述第一给定期间结束时未获取到所述SL-RSRP测量结果， 则开始进行所述发现消息传输。
  6. 根据权利要求1-4中任一项所述的方法，其中，判断是否触发中继重选包括：
    如果在第一给定期间内获取到了所述SL-RSRP测量结果，则在所述SL-RSRP测量结果低于第一给定阈值时，判定为应当触发中继重选；和/或
    如果未在第一给定期间内获取到所述SL-RSRP测量结果，则在所获取到的SD-RSRP低于第二给定阈值时，判定为应当触发中继重选。
  7. 根据权利要求1-4中任一项所述的方法，其中，在基于候选中继UE针对所述远端UE传输的发现消息的SD-RSRP测量结果，判断是否应当触发中继重选时，还包括：
    如果在第二给定期间内，获取到了SL-RSRP测量结果，则：
    停止执行发现消息传输，和/或重启所述第一给定期间；以及
    基于所获取到的SL-RSRP测量结果，判断是否应当触发中继重选，所述第二给定期间是从所述第一给定期间结束的时刻起的期间。
  8. 根据权利要求7所述的方法，还包括：
    如果未在所述第一给定期间内获取到所述SL-RSRP测量结果，则启动第二定时，其中，
    在满足如下任一条件时，判断为在第二给定期间内获取到了SL-RSRP测量结果：
    在所述第二定时超时前获取到了SL-RSRP测量结果；
    在所述第二定时期间内，获取到所述SL-RSRP测量结果的次数达到预定次数。
  9. 根据权利要求1-4中任一项所述的方法，其中，触发中继重选包括：
    执行以下动作：
    开始进行针对候选中继UE的发现消息传输，以搜索所述候选中继 UE；
    获取所述候选中继UE传输的发现消息的SD-RSRP；以及
    选择SD-RSRP超过第三给定阈值的候选中继UE作为新的中继UE。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至9中任一项所述的方法。
PCT/CN2021/136780 2020-12-11 2021-12-09 执行侧行通信中继重选的方法及用户设备 WO2022121982A1 (zh)

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