WO2021031896A1 - 用于辅链路的中继选择方法及装置、存储介质、终端 - Google Patents

用于辅链路的中继选择方法及装置、存储介质、终端 Download PDF

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Publication number
WO2021031896A1
WO2021031896A1 PCT/CN2020/108108 CN2020108108W WO2021031896A1 WO 2021031896 A1 WO2021031896 A1 WO 2021031896A1 CN 2020108108 W CN2020108108 W CN 2020108108W WO 2021031896 A1 WO2021031896 A1 WO 2021031896A1
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Prior art keywords
relay
terminal
candidate
link
message
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PCT/CN2020/108108
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English (en)
French (fr)
Inventor
张萌
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展讯通信（上海）有限公司
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Priority to US17/635,564 priority Critical patent/US20220303866A1/en
Publication of WO2021031896A1 publication Critical patent/WO2021031896A1/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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to the field of communication technology, in particular to a relay selection method and device, storage medium, and terminal for auxiliary links.
  • the relay at this time communicates with the base station and the remote UE (remote UE) respectively to establish a communication bridge between the base station and the UE.
  • UE User Equipment-to-network relay
  • UE-to-UE relay can be introduced.
  • the role of the relay is to enable normal communication between the two UEs when the communication distance is limited or the channel quality is limited.
  • the relay selection logic in the existing UE-network relay scenario cannot fully adapt to the UE-to-UE relay scenario, and if it is directly applied, it will affect the UE and the UE's sidelink communication quality.
  • the technical problem solved by the present invention is how to provide a relay selection logic suitable for UE-to-UE relay scenarios to ensure that the communication distance between the two UEs that are the communication peers in the auxiliary link is limited or the channel is limited. Normal communication can still be achieved even with limited quality.
  • an embodiment of the present invention provides a relay selection method for a secondary link, where the secondary link is a communication link between a first terminal and a second terminal, and the relay selection method
  • the method includes: receiving a first message, the first message including a first candidate relay set, the first candidate relay set including at least one candidate whose first link quality with the first terminal reaches a preset threshold Then; according to the second link quality between the second terminal and at least one candidate relay in the first candidate relay set, select a preferred relay from the first candidate relay set; select the preferred relay Then it is determined as the relay of the first terminal and the second terminal on the secondary link.
  • the selecting a preferred relay from the first candidate relay set according to the second link quality of the second terminal and at least one candidate relay in the first candidate relay set includes: Determine a second candidate relay set, where the second candidate relay set includes at least one candidate relay whose second link quality with the second terminal reaches the preset threshold; obtain the first candidate relay The intersection of the set and the second candidate relay set; determining the candidate relay in the intersection as the preferred relay.
  • the determining the candidate relay in the intersection as the preferred relay includes: for each candidate relay in the intersection , Respectively determine the first link quality between the candidate relay and the first terminal, and the second link quality between the candidate relay and the second terminal; and combine the intersection with the third link quality The highest candidate relay is selected as the preferred relay, wherein the third link quality is determined according to the first link quality and the second link quality.
  • the selecting a preferred relay from the first candidate relay set according to the second link quality of the second terminal and at least one candidate relay in the first candidate relay set includes: For each candidate relay in the first candidate relay set, obtain the second link quality between the candidate relay and the second terminal; determine the candidate relay with the highest second link quality Is the preferred relay.
  • the relay selection method before receiving the first message, further includes: sending a second message, where the second message is used to request the first candidate relay set.
  • the second message is further used to indicate the number of candidate relays included in the first candidate relay set.
  • the relay selection method further includes: receiving a third message, where the third message includes feedback information about the success of receiving the second message.
  • the relay selection method further includes: sending a fourth message, where the fourth message includes the preferred relay.
  • the relay selection method before receiving the first message, further includes: judging whether to trigger a relay selection operation according to the link quality of the secondary link; or, receiving a start instruction, the start instruction being used for Trigger the relay selection operation.
  • the relay selection method further includes: when the quality of the first link between the first terminal and the preferred relay is lower than the preset threshold, and/or the second terminal and the Preferably, when the quality of the second link of the relay is lower than the preset threshold, the relay is reselected.
  • the link quality is determined according to corresponding channel state information, and the channel state information is at least selected from: RSRP, RSSI, RSRQ, L1-SINR and CQI.
  • an embodiment of the present invention also provides a relay selection device for a secondary link, where the secondary link is a communication link between a first terminal and a second terminal, and the relay selection
  • the apparatus includes: a receiving module configured to receive a first message, the first message including a first candidate relay set, and the first candidate relay set includes at least one first link with the first terminal that has a quality A candidate relay with a preset threshold; a selection module, configured to select from the first candidate relay set according to the second link quality between the second terminal and at least one candidate relay in the first candidate relay set Select a preferred relay in the middle; a determining module, configured to determine the preferred relay as the relay of the first terminal and the second terminal on the secondary link.
  • an embodiment of the present invention also provides a storage medium on which computer instructions are stored, and the computer instructions execute the steps of the above method when the computer instructions are executed.
  • an embodiment of the present invention also provides a terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and when the processor runs the computer instructions Perform the steps of the above method.
  • the embodiment of the present invention provides a relay selection method for a secondary link, where the secondary link is a communication link between a first terminal and a second terminal, and the relay selection method includes: receiving a first message , The first message includes a first candidate relay set, and the first candidate relay set includes at least one candidate relay whose first link quality with the first terminal reaches a preset threshold; The second link quality between the second terminal and at least one candidate relay in the first candidate relay set, select a preferred relay from the first candidate relay set; determine the preferred relay as the first Relay of a terminal and a second terminal on the secondary link.
  • the solution of this embodiment can provide a relay selection logic suitable for UE-to-UE relay scenarios to ensure that the communication distance or channel quality is limited between the two UEs that are the communication peers in the secondary link. It can still communicate normally under the circumstances. Specifically, compared to the prior art relay selection logic that only considers the channel quality between the UE itself and the relay that performs relay selection, the solution of this embodiment also includes the channel quality between the UE and the relay as the receiving end. Following the consideration of selection, the final selected preferred relay is more suitable for both UEs at both ends communicating through the secondary link.
  • the second candidate relay set includes at least one candidate relay whose second link quality with the second terminal reaches the preset threshold; and obtain the first candidate relay
  • the intersection of the relay set and the second candidate relay set; and the candidate relay in the intersection is determined as the preferred relay. Therefore, the channel quality of the UE and the relay at both ends of the data transmission through the relay is included in the consideration of the relay selection, which helps to ensure that the final selected preferred relay is the same for the UEs at both ends communicating through the auxiliary link. More appropriate.
  • Fig. 1 is a flowchart of a relay selection method for a secondary link according to an embodiment of the present invention
  • Figure 2 is a signaling interaction diagram of a typical application scenario in an embodiment of the present invention.
  • FIG. 3 is a flowchart of a first specific implementation of step S102 in FIG. 1;
  • FIG. 4 is a flowchart of a specific implementation of step S1023 in FIG. 3;
  • FIG. 5 is a flowchart of a second specific implementation manner of step S102 in FIG. 1;
  • FIG. 6 is a schematic structural diagram of a relay selection device for a secondary link according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of another relay selection method for a secondary link according to an embodiment of the present invention.
  • Fig. 8 is a signaling interaction diagram of another typical application scenario of an embodiment of the present invention.
  • the UE when the reference signal received power (RSRP) of the Uu link (Uu link) between the UE and the base station is lower than a certain threshold, if the UE has not selected any of the secondary links Following the UE, the UE selects a candidate secondary link relay UE, and the candidate secondary link relays the measured secondary link discovery reference signal received power (Sidelink Discovery Reference Signal Received Power, referred to as SD-RSRP). ) Should be higher than a threshold.
  • RSRP reference signal received power
  • the UE should select a candidate secondary link relay UE, and the candidate secondary link relay UE The corresponding measured SD-RSRP should be higher than this threshold.
  • the UE If the UE does not detect any secondary link relay UE that meets the requirements, the UE considers that there is no secondary link relay UE to choose from.
  • the inventor of the present application found through analysis that the prior art only considers the UE-network relay scenario.
  • the channel between the relay and the base station can be considered to be guaranteed. Even if the channel quality is reduced, it can pass
  • another base station eNB
  • eNB another base station
  • the remote UE only needs to pay attention to the channel between itself and the relay when making relay selection or reselection.
  • the channels between the two UEs and the relay need to be included in the final decision-making consideration of the final relay selection or reselection, which is not considered in the prior art.
  • an embodiment of the present invention provides a relay selection method for a secondary link, where the secondary link is a communication link between a first terminal and a second terminal, and the relay selection method
  • the method includes: receiving a first message, the first message including a first candidate relay set, the first candidate relay set including at least one candidate whose first link quality with the first terminal reaches a preset threshold Then; according to the second link quality between the second terminal and at least one candidate relay in the first candidate relay set, select a preferred relay from the first candidate relay set; select the preferred relay Then it is determined as the relay of the first terminal and the second terminal on the secondary link.
  • the solution of this embodiment can provide a relay selection logic suitable for UE-to-UE relay scenarios to ensure that the communication distance or channel quality is limited between the two UEs that are the communication peers in the secondary link. It can still communicate normally under the circumstances. Specifically, the solution of this embodiment also takes the channel quality of the UE and the relay as the receiving end into the consideration of relay selection, so that the final selected preferred relay is more suitable for both UEs at both ends communicating through the secondary link. of.
  • Fig. 1 is a flowchart of a relay selection method for a secondary link according to an embodiment of the present invention.
  • the solution of this embodiment can be applied to the UE-to-UE relay scenario, that is, between the UE and the UE that perform data communication through the secondary link, a relay is added to realize message transfer and increase the communication between the UE and the UE. Communication distance improves communication quality.
  • the solution in this embodiment may be applied to the user equipment side, such as executed by the UE.
  • the secondary link may be a communication link between a first terminal and a second terminal, wherein one of the first terminal and the second terminal is a secondary link transmitting UE (Transmit Sidelink UE, Tx-UE for short) , One of the secondary links receives UE (Received Sidelink UE, Rx-UE for short).
  • UE Transmit Sidelink UE, Tx-UE for short
  • Rx-UE Received Sidelink UE
  • the Tx-UE may be the party that sends data transmission among the two terminals communicating through the secondary link, and correspondingly, the Rx-UE may be the party that receives the data transmission.
  • the Rx-UE may also be one of the two terminals communicating through the secondary link that monitors the link quality.
  • Tx-UE and Rx-UE reference may also be made to relevant provisions in existing or future agreements.
  • the solution in this embodiment can be executed by Rx-UE or Tx-UE. That is, the solution of this embodiment can be executed by one of two terminals communicating through the secondary link.
  • the second terminal may be an Rx-UE or a Tx-UE.
  • the relay selection method for the secondary link described in this embodiment may include the following steps:
  • Step S101 Receive a first message, where the first message includes a first candidate relay set, and the first candidate relay set includes at least one candidate whose first link quality with the first terminal reaches a preset threshold. relay;
  • Step S102 selecting a preferred relay from the first candidate relay set according to the second link quality of the second terminal and at least one candidate relay in the first candidate relay set;
  • Step S103 Determine the preferred relay as the relay of the first terminal and the second terminal on the secondary link.
  • the link quality between the first terminal and any relay is recorded as the first link quality
  • the link quality between the second terminal and any relay is recorded as the first link quality.
  • Link quality may also be referred to as channel quality.
  • the relay selection method of this embodiment may further include the step of judging whether to trigger a relay selection operation according to the link quality of the secondary link.
  • the first terminal 21 and the second terminal 22 can both perform Operation s1 is to detect the link quality of the secondary link and determine whether it is necessary to trigger the relay selection process in this embodiment.
  • the link quality may be determined according to corresponding channel state information, and the channel state information may at least be selected from: RSRP, Received Signal Strength Indication (RSSI) , Reference Signal Received Quality (Reference Signal Received Quality, RSRQ for short), Layer 1 Signal to Interference Plus Noise Ratio (L1-SINR for short), and Channel Quality Indication (CQI for short).
  • RSRQ Received Signal Strength Indication
  • RSRQ Reference Signal Received Quality
  • L1-SINR Layer 1 Signal to Interference Plus Noise Ratio
  • CQI Channel Quality Indication
  • the measurement of the channel state information of the secondary link may be performed on one of the following channels or RSs, but is not limited to these channels or RSs: Physical Sidelink Shared Channel (PSSCH) Or PSSCH demodulation reference signal (Demodulation Reference Signal, referred to as DMRS); physical secondary link discovery channel (Physical Sidelink Discovery Channel, referred to as PSDCH) or PSDCH DMRS; secondary link channel state information reference signal (Sidelink Channel State Information- Reference Signal, S-CSI-RS for short); Physical Sidelink Control Channel (PSCCH) or DMRS of PSCCH; Physical Sidelink Feedback Channel (PSFCH) or DMRS of PSFCH ; Secondary link synchronization signal block (Sidelink Synchronization Signal/Physical Broadcast Channel Block, referred to as SL-SSB), secondary link primary synchronization signal (Sidelink Primary Synchronization Signal, referred to as S-PSS), secondary link secondary synchronization signal (Sidelink Secondary Synchronization Signal, S-SSS for short), Physical Side
  • the link quality may be measured according to any one or more of the above parameters.
  • the channel state information when the channel state information is lower than a preset trigger threshold, it may be determined to trigger the relay selection operation.
  • the preset trigger threshold may be configured through high-layer signaling, or may also be pre-configured.
  • the high-level signaling may be selected from: radio resource control (Radio Resource Control, RRC for short), System Information Block (SIB for short), and Media Access Control-Control Element (MAC- for short).
  • RRC Radio Resource Control
  • SIB System Information Block
  • MAC- Media Access Control-Control Element
  • the first link quality can be obtained by measuring the channel state information of the link between the first terminal and the relay;
  • the channel state information of the link between the second terminal and the relay can obtain the second link quality.
  • auxiliary links may correspond to different or the same preset trigger threshold.
  • the preset trigger threshold may be configured by higher layer signaling of the base station or defined in advance.
  • the secondary link between the first terminal and the second terminal may be bidirectional. Therefore, when the trigger judgment is made, when the measurement result of one of the first terminal and the second terminal indicates When the link quality with the opposite end is lower than the preset trigger threshold, it can be determined to trigger the relay selection operation.
  • the one of the first terminal and the second terminal as the Tx-UE may receive the CQI report or the RSRP report as the Rx-UE. If the CQI or RSRP is lower than the preset trigger threshold, the party acting as the Tx-UE can determine to trigger the relay selection or reselection operation.
  • one of the first terminal and the second terminal as the Rx-UE may determine whether to trigger the relay selection or reselection operation through the CQI or RSRP measured by it. If the CQI or RSRP is lower than the preset trigger threshold, the party as the Rx-UE may determine to trigger the relay selection operation.
  • a preset adjustment amount another parameter (hysteresis, hereinafter referred to as a preset adjustment amount) can also be configured at the same time, when the link quality is lower than the preset trigger threshold minus the value of the parameter (hysteresis) When it is determined to trigger the relay selection or reselection operation.
  • the preset adjustment amount can be used to better avoid the ping-pong effect.
  • the first terminal and the second terminal may report the channel state information obtained by their own measurement to the base station, and the base station executes the trigger judgment operation.
  • the relay selection method of this embodiment may further include the step of receiving a start instruction, where the start instruction is used to trigger the relay selection operation.
  • the start instruction may be sent by the base station.
  • the start instruction can be sent to the first terminal and the second terminal through high-level signaling or sidelink control information (Sidelink Control Information, SCI for short), so that both of them can immediately enter the process. Following the selection process.
  • SCI Sidelink Control Information
  • the start instruction may only be sent to the first terminal or the second terminal, and the terminal that receives the start instruction informs the other terminal to enter the relay selection process through high-level signaling or SCI.
  • the terminal receiving the start instruction may be the terminal currently serving as the Rx-UE among the first terminal and the second terminal.
  • the base station may instruct the first terminal and/or the second terminal to perform a relay selection or relay reselection operation through high-level signaling or downlink control information (Downlink Control Information, DCI for short).
  • DCI Downlink Control Information
  • the base station may instruct the first terminal and/or the second terminal to terminate the relay operation through high-layer signaling or DCI. That is, it indicates that the first terminal and/or the second terminal cannot communicate using the relay.
  • the first terminal may instruct the second terminal to perform relay selection or relay reselection operations through high-layer signaling or SCI.
  • the operation s1 when the relay selection operation is triggered by an instruction from the base station, the operation s1 may be omitted.
  • the first terminal when the first terminal does not need to continue the relay service, the first terminal can indicate to the second terminal and/or the relay and/or the base station that it is terminating through high-level signaling or SCI. Following the operation. That is, it indicates that the first and second terminals cannot or do not need to continue to use the relay to communicate.
  • the relay or the base station may notify the second terminal that it cannot or does not need to continue to use the relay to communicate through the high-level signaling or SCI indication.
  • the first terminal may instruct the second terminal to terminate the relay operation through high-layer signaling or SCI. That is, it indicates that the second terminal cannot communicate using the relay.
  • the relay selection method of this embodiment may further include the step of sending a second message, the second message being used to request to obtain the first candidate Following the collection.
  • the second terminal 22 may perform the operation s2 to send the first terminal 21 to the first terminal 21.
  • the second message instructs the first terminal 21 to enter the relay selection process.
  • the second message may be carried by higher layer signaling, such as RRC, SIB or MAC-CE.
  • higher layer signaling such as RRC, SIB or MAC-CE.
  • the second message may also be carried by a dynamic indication, such as SCI.
  • the operation s2 when the relay selection process is triggered in response to a start instruction of the base station, the operation s2 may be omitted.
  • the second message may also be used to indicate the number of candidate relays included in the first candidate relay set.
  • the relay selection method of this embodiment may further include the step of: receiving a third message, and the third message may include the second The message is received successfully and feedback information.
  • the first terminal 21 may determine that the secondary link with the second terminal 22 needs to be configured with a relay.
  • the first terminal 21 may perform operation s3 to send the third message to the second terminal 22.
  • the third message may be carried by PSCCH or PSSCH. Similar to the second message, the third message may also be carried by higher layer signaling or dynamic indication.
  • the dynamic indication may include a control information indication.
  • the operation s3 may be omitted, and after sending the second message, the second terminal 22 may immediately perform the measurement operation of surrounding relays to obtain the second candidate relay set. Further, in response to receiving the second message, the first terminal 21 may immediately perform operation s4.
  • the first terminal 21 may perform operation s4 to measure the quality of the first link between itself and possible relays around it. .
  • the first terminal 21 may measure the channel quality between possible relays in the surroundings and the first terminal 21.
  • the first terminal 21 may determine the first link quality based on channel state information of links with possible relays around it.
  • the operation s3 and operation s4 may be executed synchronously or asynchronously.
  • the operation s3 may be omitted.
  • the first terminal 21 may use the qualified relays among the surrounding possible relays as candidate relays to form the first candidate relay set, and perform operations s5, to send the first candidate relay set to the second terminal 22 through a first message.
  • the operation s5 can be understood as a step corresponding to the step S101.
  • the first message may also be carried by higher layer signaling or dynamic indication.
  • the qualified relay means that the quality of the first link between the first terminal 21 and the relay reaches the preset threshold.
  • the preset threshold may be determined according to the preset trigger threshold.
  • the first terminal 21 may measure the RSRP of a reference signal or channel sent by a surrounding relay, and when the measured RSRP is greater than the preset trigger threshold, it may determine that the relay meets the condition.
  • the first terminal 21 may measure the RSRP of a reference signal or channel sent by a surrounding relay, and if the measured RSRP is greater than the sum of the preset trigger threshold and the preset adjustment amount (hysteresis), it may determine The relay meets the conditions.
  • the first terminal 21 may also measure other channel state information sent by a surrounding relay to determine whether the relay meets the conditions.
  • the preset adjustment amount can be configured through high-layer signaling or predefined.
  • the link quality can be measured based on channel state information.
  • the first candidate relay set may include all qualified relays measured by the first terminal.
  • the first terminal may obtain from all the relays that meet the conditions measured Select n relays with the highest first link quality to form the first candidate relay set.
  • the number n may be used to indicate n candidate relays that meet specific requirements that the first terminal needs to feed back; or, it may be n candidate relays with the best channel quality; or, it may be Any n candidate relays among the measured nearby relays.
  • the number n may be indicated to the first terminal and/or the second terminal by the base station through high layer signaling or SCI.
  • the number n may also be predefined.
  • the first candidate relay set may only include the relay with the highest first link quality among all the relays that are qualified by measurement.
  • the first candidate relay set may include all measured relays that meet the condition, regardless of whether the first link quality of the relay meets the condition.
  • the first candidate relay set may be autonomously determined by the first terminal to determine elements in the set.
  • the first candidate relay set may include an identification (Identification, ID for short) of the candidate relay, and/or the first link quality of each candidate relay. Specifically, this information can be carried by PSSCH.
  • step S102 may include the following steps:
  • Step S1021 Determine a second candidate relay set, where the second candidate relay set includes at least one candidate relay whose second link quality with the second terminal reaches the preset threshold;
  • Step S1022 Obtain the intersection of the first candidate relay set and the second candidate relay set;
  • Step S1023 Determine the candidate relay in the intersection as the preferred relay.
  • the channel quality of the UE and the relay at both ends of the data transmission through the relay is included in the consideration of the relay selection, which helps to ensure that the final selected preferred relay is the same for the UEs at both ends communicating through the auxiliary link. More appropriate.
  • the second terminal 22 may perform operation s6 to determine the second candidate relay set, and to obtain a connection with the first candidate relay set Select the preferred relay in the intersection of.
  • the second terminal 22 may also measure the second link quality between itself and possible relays around it.
  • the second terminal 22 may measure the RSRP of a reference signal or channel sent by possible relays around it, and compose the second candidate relay set with relays whose RSRP meets the conditions.
  • the preset trigger threshold for judging whether a relay can join the first candidate relay set can be the same as the preset trigger threshold for judging whether a relay can join the second candidate relay set. It can be different.
  • the preset adjustment amount used to determine whether the relay can join the first candidate relay set may be the same or different from the preset adjustment amount used to determine whether the relay can join the second candidate relay set.
  • the second candidate relay set may include all qualified relays measured by the second terminal.
  • the number of relays included in the second candidate relay set may be equal to the number indicated by the second terminal in the second message.
  • the second candidate relay set may only include the relay with the highest second link quality among all measured relays that meet the conditions.
  • the second candidate relay set may include all measured relays that meet the condition, regardless of whether the second link quality of the relay meets the condition.
  • the number of relays included in the second candidate relay set may be configured or predefined by the base station through high-layer signaling.
  • the second candidate relay set may include an identification (Identification, ID for short) of the candidate relay, and may also include the second link quality of each candidate relay.
  • the intersection of the first candidate relay set and the second candidate relay set can be obtained, that is, recorded in the first candidate at the same time
  • the candidate relay in the subsequent set and the second candidate relay set. This intersection can be recorded as the third candidate relay set.
  • the second terminal may resend the second message to the first terminal to perform the relay selection process again.
  • the second terminal may consider that there is no suitable relay to serve at present, and directly end the relay selection operation.
  • the second terminal may notify the base station through high-layer signaling that it has not found a suitable relay to serve.
  • the candidate relay may be determined as the preferred relay.
  • the second terminal may A candidate relay is selected from the third candidate relay set as the preferred relay.
  • the second terminal may randomly select a candidate relay from the third candidate relay set as the preferred relay.
  • the preferred relay is the service relay of the secondary link.
  • a candidate relay corresponding to max i min ⁇ RSRPi-1, RSRPi-2 ⁇ may be selected from the third candidate relay set as the preferred relay, where max i min ⁇ A i ,B i ⁇ function is used to select the smallest value from A i and B i , and then select the largest value corresponding to A i or B i from all the smallest values.
  • RSRPi-1 is the i-th candidate relay and The first link quality of a terminal
  • RSRPi-2 is the second link quality of the i-th candidate relay and the second terminal.
  • the minimum value of the first link quality and the second link quality of the candidate relay is used as the selection criterion, and the minimum value is The candidate relay with the largest numerical value is determined as the preferred relay.
  • the parameters in the max i min ⁇ function can also be replaced with other parameters that can measure link quality.
  • the step S1023 may include the following steps:
  • Step S10231 For each candidate relay in the intersection, determine the first link quality between the candidate relay and the first terminal, and the second link quality between the candidate relay and the second terminal. Link quality;
  • Step S10232 the candidate relay with the highest third link quality in the intersection is selected as the preferred relay, wherein the third link quality is determined according to the first link quality and the second link quality .
  • the third link quality may be the four arithmetic results of the first link quality and the second link quality.
  • the third link quality may be the sum of the first link quality and the second link quality in the third candidate relay set.
  • the third link quality may be the product of the first link quality and the second link quality in the third candidate relay set.
  • the step S1021 may be performed before/after/at the same time as the operation s4 shown in FIG. 2.
  • FIGS. 3 and 4 can be applied to scenarios where the first terminal and the second terminal do not monitor the link quality of the surrounding relays in real time.
  • the step S102 may include the following steps:
  • Step S1028 For each candidate relay in the first candidate relay set, obtain the second link quality between the candidate relay and the second terminal;
  • Step S1029 Determine the candidate relay with the highest second link quality as the preferred relay.
  • the second terminal may not perform any operation before receiving the first message, and after receiving the first message Then, directly select a suitable candidate relay from the first candidate relay set as the service relay.
  • the candidate relays in the first candidate relay set may be arranged in descending order of first link quality.
  • the second terminal may sequentially measure the second link quality with each candidate relay starting from the candidate relay with the highest ranking. If the second link quality after subtracting the preset adjustment amount is still greater than the preset trigger threshold, it may be determined that the candidate relay is the preferred relay.
  • the embodiment shown in FIG. 5 can be applied to a scenario where the first terminal and the second terminal monitor the link quality of surrounding relays in real time.
  • the relay selection method of this embodiment may further include the step of sending a fourth message, and the fourth message may include the preferred relay.
  • the fourth message may include the identification of the preferred relay.
  • the second terminal 22 may also perform an operation s7 to send the fourth message to the first terminal 21.
  • the relay selection method of this embodiment may further include the step: when the quality of the first link between the first terminal and the preferred relay is lower than When the preset threshold and/or the quality of the second link between the second terminal and the preferred relay is lower than the preset threshold, the relay is reselected.
  • the first terminal 21 and the second terminal 22 select the preferred relay and perform auxiliary link communication based on the preferred relay, the first Both the terminal 21 and the second terminal 22 can measure the link quality between themselves and the preferred relay.
  • the preferred relay when the first terminal 21 and the second terminal 22 simultaneously measure and find that the quality of the link between themselves and the preferred relay is lower than the preset threshold, it is determined that the preferred relay is no longer suitable for And perform operation s8 on the secondary link to trigger the peer end to perform a relay reselection operation.
  • the quality of the first link is lower than the preset trigger threshold minus a preset adjustment amount, it is determined that a relay needs to be reselected. Or, when the quality of the first link is lower than the preset trigger threshold, it is determined that the relay needs to be reselected.
  • the quality of the second link is lower than the preset trigger threshold minus a preset adjustment amount, it is determined that the relay needs to be reselected. Or, when the quality of the second link is lower than the preset trigger threshold, it is determined that the relay needs to be reselected.
  • the quality of the first link is lower than the preset trigger threshold minus a preset adjustment amount
  • the quality of the second link is lower than the preset trigger threshold minus a preset
  • the threshold judgment condition for triggering the relay selection or relay reselection operation may be: the link quality is lower than the preset trigger threshold (threshold), or the link quality is lower than the trigger threshold (threshold) minus the preset adjustment (hysteresis) value.
  • the criterion for determining that the relay meets the condition may be: the link quality is higher than the preset trigger threshold (threshold), or the link quality is higher than the sum of the trigger threshold (threshold) and the preset adjustment (hysteresis).
  • the solution of this embodiment can provide a relay selection logic suitable for UE-to-UE relay scenarios to ensure that the communication distance between the two UEs that are the communication peers in the secondary link is limited. Or it can communicate normally even when the channel quality is limited.
  • the solution of this embodiment also includes the channel quality between the UE and the relay as the receiving end. Following the consideration of selection, the final selected preferred relay is more suitable for both UEs at both ends communicating through the secondary link.
  • the first terminal or the second terminal may send a request to suspend the relay service to all Said relay or base station.
  • the request may be carried by higher layer signaling.
  • Fig. 6 is a schematic structural diagram of a relay selection device for a secondary link according to an embodiment of the present invention.
  • the relay selection device 6 for the secondary link hereinafter referred to as the relay selection device 6
  • the relay selection device 6 for the secondary link can be used to implement the above-mentioned embodiments shown in FIGS. 1 to 5 Method technical scheme.
  • the secondary link may be a communication link between the first terminal and the second terminal.
  • the relay selection device 6 of this embodiment may include: a receiving module 61, configured to receive a first message, where the first message includes a first candidate relay set, and the first The candidate relay set includes at least one candidate relay whose first link quality with the first terminal reaches a preset threshold; the selection module 62 is configured to determine whether the second terminal is in the first candidate relay set For the second link quality of at least one candidate relay, a preferred relay is selected from the first candidate relay set; a determining module 63, configured to determine the preferred relay as the first terminal and the second terminal Relay on the secondary link.
  • the embodiment of the present invention also discloses a storage medium on which computer instructions are stored, and when the computer instructions are run, the method and technical solutions described in the embodiments shown in FIGS. 1 to 5 are executed.
  • the storage medium may include a computer-readable storage medium such as a non-volatile memory or a non-transitory memory.
  • the storage medium may include ROM, RAM, magnetic disk or optical disk, etc.
  • an embodiment of the present invention also discloses a terminal, including a memory and a processor, the memory stores computer instructions that can run on the processor, and the processor executes the above diagram when the computer instructions are executed.
  • the terminal may be a 5G user terminal.
  • Fig. 7 is a flowchart of another relay selection method for a secondary link according to an embodiment of the present invention.
  • the fifth message is sent by the first terminal
  • the sixth message is sent by the second terminal
  • the fourth link refers to the link between the relay and the first terminal
  • the fifth link refers to the link between the relay and the second terminal.
  • the relay selection method of this embodiment may include: step S201, receiving a fifth message and/or a sixth message.
  • the fifth message may include information of a terminal whose link quality of the fourth link reaches a preset threshold; the sixth message may contain information of a terminal whose link quality of the fifth link reaches the preset threshold.
  • the relay may receive the fifth message sent by the first terminal.
  • the first terminal may be in charge of whether to perform auxiliary link communication through the relay.
  • the relay may receive the sixth message sent by the second terminal.
  • the second terminal may be in charge of whether to perform auxiliary link communication through the relay.
  • the relay may respectively receive the fifth message sent by the first terminal and the sixth message sent by the second terminal.
  • the terminal implementing the solution of this embodiment can determine whether it can provide a relay service for the secondary link between the first terminal and the second terminal according to the fifth message and the sixth message.
  • the fifth message may also include terminal information of other terminals whose link quality with the relay reaches the preset threshold.
  • the sixth message may also include terminal information of other terminals whose link quality with the relay reaches the preset threshold.
  • the fifth message or the sixth message may include at least one of the following information:
  • the first terminal identification (Identification, ID for short);
  • the first terminal ID may identify or uniquely identify the first terminal.
  • the second terminal ID may identify or uniquely identify the second terminal.
  • the relay ID can identify or uniquely identify the relay. Among them, multiple relay IDs can be included.
  • the number of the relay IDs may be configured by the base station through high-layer signaling, or determined by the first terminal or the second terminal, or predefined.
  • the relay in the fifth message needs to satisfy that the channel state information of the fourth link is greater than a threshold.
  • the relay included in the fifth message needs to satisfy that the RSRP or RSSI or RSRQ or CQI or L1-SINR of the corresponding fourth link channel is greater than a threshold.
  • the threshold can be configured by the base station through high-level signaling or predefined.
  • the relay in the sixth message needs to satisfy that the channel state information of the fifth link is greater than a threshold.
  • the relay included in the sixth message needs to satisfy that the RSRP or RSSI or RSRQ of the corresponding fifth link channel is greater than a threshold.
  • the threshold can be configured by the base station through high-level signaling or predefined.
  • the relay selection method of this embodiment may further include: Step S202: The relay determines which terminals the relay can provide relay services for according to the received fifth message and/or sixth message .
  • the relay determines that it can provide the relay service for the first terminal and the second terminal.
  • the relay implementation can determine which group or groups of first terminals and second terminals provide the relay service.
  • the relay can select the first terminal and the second terminal group, corresponding to max i min ⁇ RSRPi-1,RSRPi -2 ⁇ The group finally selected for relay service.
  • RSRPi-1 is the link quality between the i-th first terminal and the relay
  • RSRPi-2 is the link quality between the i-th second terminal and the relay.
  • the relay can select the first terminal and the second terminal group, which corresponds to RSRPi-1+RSRPi-2.
  • the group performs relay services.
  • RSRPi-1 is the link quality between the i-th first terminal and the relay
  • RSRPi-2 is the link quality between the i-th second terminal and the relay.
  • the relay can select the first terminal and the second terminal group, corresponding to RSRPi-1 ⁇ RSRPi-2 maximum
  • the group performs relay services.
  • RSRPi-1 is the link quality between the i-th first terminal and the relay
  • RSRPi-2 is the link quality between the i-th second terminal and the relay.
  • RSRP link quality prediction
  • other parameters that can measure link quality can also be selected as the selection basis, such as RSSI, CQI, L1-SINR, RSRQ, etc.
  • the relay selection method of this embodiment may further include: step S203, the relay sends a seventh message, and the seventh message may be used to indicate which terminals the relay can provide relay services for.
  • the seventh message may include at least one of the following information:
  • the relay ID may be the relay ID for sending the seventh message.
  • the first terminal 31 may perform operation s11 respectively to detect the link quality of the secondary link and determine whether it is necessary to trigger the relay selection process in this embodiment.
  • the first terminal 31 needs to communicate with the second terminal 32 through the secondary link, but the first terminal 31 fails to detect the existence of the second terminal 32, and/or the second terminal 32 fails to detect The existence of the first terminal 31 triggers the relay selection process at this time.
  • the first terminal 31 may determine the existence of the second terminal 32 based on the strength of the reference signal or the channel sent by the second terminal 32 and the information carried by the reference signal.
  • the reference signal or channel can be one of the following:
  • the operation s11 may be omitted.
  • the second terminal 32 may perform operation s12 to measure the link quality between itself and the relay, so as to determine which relays may be candidate relays.
  • the second terminal 32 may measure the channel quality (also referred to as link quality) with the relay 33, that is, the channel quality of the fifth link.
  • the channel quality can be obtained by measuring the reference signal or channel sent by the relay 33.
  • the reference signal or channel that the relay 33 may send may include at least one of the following:
  • the second terminal 32 may measure RSRP or RSSI or RSRQ or CQI or L1-SINR of the channel of the fifth link. If the RSRP or RSSI or RSRQ or CQI or L1-SINR of the channel of the fifth link is greater than a threshold, then the relay 33 corresponding to the fifth link can be selected as a candidate relay and placed in the fourth set , Corresponding to operation s12.
  • the fourth set includes relay information for the fifth link that meets the channel quality requirement.
  • the UE may select the relay with the best channel quality in the fourth set as the final candidate relay, and put its corresponding relay information in the sixth message.
  • the first terminal 31 may perform operation s13 to measure the link quality of the fourth link between itself and the relay, so as to determine which relays may be candidate relays.
  • the first terminal 31 may perform operation s14 to send the fifth message.
  • the second terminal 32 may perform operation s15 to send the sixth message.
  • the operations s12 and/or s15 may be omitted.
  • the first terminal 31 may measure the channel quality with the relay 33, that is, the channel quality of the fourth link.
  • the channel quality can be obtained by measuring the reference signal or channel sent by the relay 33.
  • the reference signal or channel that the relay 33 may send may include at least one of the following:
  • the first terminal 31 may measure the RSRP or RSSI or RSRQ or CQI or L1-SINR of the channel of the fourth link. If the RSRP or RSSI or RSRQ or CQI or L1-SINR of the channel of the fourth link is greater than a threshold, then the relay corresponding to the fourth link can be selected as a candidate relay and placed in the fifth set, Corresponds to operation s13.
  • the fifth set includes relay information for the fourth link that meets the channel quality requirement.
  • the UE may select the relay with the best channel quality in the fifth set as the final candidate relay, and put its corresponding relay information in the fifth message.
  • the first terminal 31 may perform operation s14 to send a fifth message.
  • the operations s13 and/or s14 may be omitted.
  • the relay 33 may perform operation s16 to determine the specific first message according to the received fifth message and/or sixth message.
  • a terminal and a second terminal group perform relay services.
  • the relay 33 may perform operation s17 and operation s18 to send a seventh message, and the seventh message may be used to indicate which terminals the relay 33 can perform relay services for.
  • the target terminal of the seventh message may be the first terminal 31 or the second terminal 32, or the seventh message may be sent to the first terminal 31 and the second terminal 32 respectively.
  • the first terminal 31 and/or the second terminal 32 may feed back whether it receives the seventh message correctly.
  • the first terminal 31 may perform operation s19 to send feedback information to the relay 33, the feedback information being used to indicate that the The seventh news.
  • the relay 33 may perform operation s20 to send an eighth message to the second terminal 32.
  • the eighth message may be used to indicate which terminals the relay 33 can perform relay services for.
  • one or more operations shown in FIG. 8 may be omitted.
  • the terminal in the embodiments of this application may refer to various forms of user equipment, access terminal, user unit, user station, mobile station, mobile station (mobile station, MS), remote station, remote terminal, mobile device, user terminal , Terminal equipment (terminal equipment), wireless communication equipment, user agent or user device.
  • the terminal device can also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (Public Land Mobile Network, referred to as The terminal equipment in the PLMN) is not limited in the embodiment of the present application.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • connection appearing in the embodiments of this application refers to various connection modes such as direct connection or indirect connection to realize communication between devices, which is not limited in the embodiments of this application.
  • the processor may be a central processing unit (Central Processing Unit, CPU for short), and the processor may also be other general-purpose processors or digital signal processors (DSP for short). , Application Specific Integrated Circuit (ASIC for short), Field Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be a read-only memory (Read-Only Memory, ROM for short), a programmable read-only memory (Programmable ROM, PROM for short), and an erasable programmable read-only memory (Erasable PROM, EPROM for short). , Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM for short) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM for short), which is used as an external cache.
  • Random Access Memory Random Access Memory
  • static random access memory SRAM for short
  • dynamic random access memory Dynamic Random Access Memory
  • DRAM synchronous dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • Enhanced SDRAM ESDRAM for short
  • SLDRAM Synchronous connection to DRAM
  • DR-RAM Direct Rambus RAM
  • the foregoing embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions or computer programs.
  • the computer instructions or computer programs are loaded or executed on the computer, the processes or functions according to the embodiments of the present invention are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium.
  • the semiconductor medium may be a solid state drive.
  • the size of the sequence number of the foregoing processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be used in the embodiments of the present invention
  • the implementation process constitutes any limitation.
  • the disclosed method, device, and system can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may be separately physically included, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.
  • the above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium.
  • the above-mentioned software function unit is stored in a storage medium, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute part of the steps of the method described in each embodiment of the present invention.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disks or optical disks, etc., which can store program codes Medium.

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Abstract

一种用于辅链路的中继选择方法及装置、存储介质、终端，所述辅链路为第一终端和第二终端之间的通信链路，所述方法包括：接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。本发明方案提供一种适用于UE-to-UE中继场景的中继选择逻辑，确保辅链路中互为通信对端的两个UE之间在通信距离受限或者信道质量受限的情况下仍能正常通信。

Description

用于辅链路的中继选择方法及装置、存储介质、终端
本申请要求于2019年8月16日提交中国专利局、申请号为201910759360.2、发明名称为“用于辅链路的中继选择方法及装置、存储介质、终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，具体地涉及一种用于辅链路的中继选择方法及装置、存储介质、终端。
背景技术
在协议版本12(Release 12，简称R12)至R15设备通信(Device-to-Device，简称D2D)的研究中，主要关注的是用户设备-网络中继(User Equipment-to-network relay，简称UE-to-network relay)的类型。也即，此时的中继(relay)分别与基站和远程UE(remote UE)进行通信，以在基站和UE间建立通信桥梁。
在未来的车联网及其他相似或者相关的应用场景中，车和车之间的通信由于通信距离受限或者信道质量受限，可以引入UE-to-UE中继(UE-to-UE relay)的应用。此时，中继的作用是使得两个UE之间在通信距离受限或者信道质量受限的情况下依然能够正常通信。
但是，现有UE-网络中继场景下的中继选择逻辑并不能很到的适应UE-to-UE中继场景，若直接应用会影响UE和UE的辅链路(sidelink)通信质量。
发明内容
本发明解决的技术问题是如何提供一种适用于UE-to-UE中继场景的中继选择逻辑，以确保辅链路中互为通信对端的两个UE之间在通信距离受限或者信道质量受限的情况下仍能正常通信。
为解决上述技术问题，本发明实施例提供一种用于辅链路的中继选择方法，所述辅链路为第一终端和第二终端之间的通信链路，所述中继选择方法包括：接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
可选的，所述根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继包括：确定第二候选中继集合，所述第二候选中继集合包括至少一个与所述第二终端的第二链路质量达到所述预设阈值的候选中继；获取所述第一候选中继集合与所述第二候选中继集合的交集；将所述交集中的候选中继确定为所述优选中继。
可选的，当所述交集中候选中继的数量为多个时，所述将所述交集中的候选中继确定为所述优选中继包括：对于所述交集中的每一候选中继，分别确定所述候选中继与所述第一终端的第一链路质量，以及所述候选中继与所述第二终端的第二链路质量；将所述交集中第三链路质量最高的候选中继选择为所述优选中继，其中，所述第三链路质量根据所述第一链路质量和第二链路质量确定。
可选的，所述根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继包括：对于所述第一候选中继集合中的每一候选中继，获取所述候选中继与所述第二终端的第二链路质量；将所述第二链路质量最高 的候选中继确定为所述优选中继。
可选的，在接收第一消息之前，所述中继选择方法还包括：发送第二消息，所述第二消息用于请求获取所述第一候选中继集合。
可选的，所述第二消息还用于指示所述第一候选中继集合包括的候选中继的数量。
可选的，在发送第二消息之后，接收第一消息之前，所述中继选择方法还包括：接收第三消息，所述第三消息包括第二消息接收成功反馈信息。
可选的，所述中继选择方法还包括：发送第四消息，所述第四消息包括所述优选中继。
可选的，在接收第一消息之前，所述中继选择方法还包括：根据所述辅链路的链路质量判断是否触发中继选择操作；或者，接收启动指令，所述启动指令用于触发所述中继选择操作。
可选的，所述中继选择方法还包括：当所述第一终端与所述优选中继的第一链路质量低于所述预设阈值，和/或所述第二终端与所述优选中继的第二链路质量低于所述预设阈值时，重新选择中继。
可选的，对于所述第一链路质量和第二链路质量中的任一链路质量，所述链路质量是根据对应的信道状态信息确定的，所述信道状态信息至少选自：RSRP、RSSI、RSRQ、L1-SINR以及CQI。
为解决上述技术问题，本发明实施例还提供一种用于辅链路的中继选择装置，所述辅链路为第一终端和第二终端之间的通信链路，所述中继选择装置包括：接收模块，用于接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；选择模块，用于根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；确定模块，用于将所述优选中继确定为所述第一终端和第二终端在所述辅链路 上的中继。
为解决上述技术问题，本发明实施例还提供一种存储介质，其上存储有计算机指令，所述计算机指令运行时执行上述方法的步骤。
为解决上述技术问题，本发明实施例还提供一种终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令时执行上述方法的步骤。
与现有技术相比，本发明实施例的技术方案具有以下有益效果：
本发明实施例提供一种用于辅链路的中继选择方法，所述辅链路为第一终端和第二终端之间的通信链路，所述中继选择方法包括：接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
本实施例的方案能够提供一种适用于UE-to-UE中继场景的中继选择逻辑，确保辅链路中互为通信对端的两个UE之间在通信距离受限或者信道质量受限的情况下仍能正常通信。具体而言，较之现有技术仅考虑执行中继选择的UE自身与中继之间的信道质量的中继选择逻辑，本实施例方案将作为接收端的UE与中继的信道质量也纳入中继选择的考量，使得最终选定的优选中继对于通过辅链路进行通信的两端UE均是较合适的。
进一步，确定第二候选中继集合，所述第二候选中继集合包括至少一个与所述第二终端的第二链路质量达到所述预设阈值的候选中继；获取所述第一候选中继集合与所述第二候选中继集合的交集；将所述交集中的候选中继确定为所述优选中继。由此，将通过中继实现数据传输的两端UE与中继的信道质量均纳入中继选择的考量，利于 确保最终选定的优选中继对于通过辅链路进行通信的两端UE均是较合适的。
附图说明
图1是本发明实施例的一种用于辅链路的中继选择方法的流程图；
图2是本发明实施例一个典型应用场景的信令交互图；
图3是图1中步骤S102的第一个具体实施方式的流程图；
图4是图3中步骤S1023的一个具体实施方式的流程图；
图5是图1中步骤S102的第二个具体实施方式的流程图；
图6是本发明实施例的一种用于辅链路的中继选择装置的结构示意图；
图7是本发明实施例的另一种用于辅链路的中继选择方法的流程图；
图8是本发明实施例另一个典型应用场景的信令交互图。
具体实施方式
如背景技术所言，目前协议中关于UE-网络中继场景下的选择(selection)与重选择(reselection)的相关描述可以参考协议36.331。
具体而言，当UE与基站之间的Uu链路(Uu link)的参考信号接收功率(Reference Signal Received Power，简称RSRP)低于某一阈值时，如果UE还没有选择任何一个辅链路中继UE，则该UE选择一个候选(candidate)辅链路中继UE，该候选辅链路中继UE对应测量的辅链路发现参考信号接收功率(Sidelink Discovery Reference Signal Received Power，简称SD-RSRP)应当高于一个阈值。
否则，如果UE已经选择了一个辅链路中继UE，但是其对应测量的SD-RSRP低于该阈值，此时UE应当选择一个候选辅链路中继UE，该候选辅链路中继UE对应测量的SD-RSRP应当高于该阈值。
如果UE没有检测到任何满足要求的辅链路中继UE，则该UE就认为没有任何辅链路中继UE可以选择。
本申请发明人经过分析发现，现有技术只考虑了UE-网络中继场景，在该场景下，中继和基站之间的信道可以认为是有保障的，即使信道质量发生了下降也可以通过切换(handover)的形式找到其他的基站(eNB)为中继提供可靠的Uu链路。在该场景下，远程UE在做中继选择或重选择时，只需要关注自己与中继之间的信道。
而在UE-to-UE中继场景下，两个UE与中继之间的信道都需要纳入最后中继选择或重选择的最后决策考虑中，而现有技术并未考虑到这一点。
为解决上述技术问题，本发明实施例提供一种用于辅链路的中继选择方法，所述辅链路为第一终端和第二终端之间的通信链路，所述中继选择方法包括：接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
本实施例的方案能够提供一种适用于UE-to-UE中继场景的中继选择逻辑，确保辅链路中互为通信对端的两个UE之间在通信距离受限或者信道质量受限的情况下仍能正常通信。具体而言，本实施例方案将作为接收端的UE与中继的信道质量也纳入中继选择的考量，使得最终选定的优选中继对于通过辅链路进行通信的两端UE均是较合适的。
为使本发明的上述目的、特征和有益效果能够更为明显易懂，下面结合附图对本发明的具体实施例做详细的说明。
图1是本发明实施例的一种用于辅链路的中继选择方法的流程图。
本实施例的方案可以应用于UE-to-UE中继场景，也即，在通过辅链路进行数据通信的UE和UE之间，增设中继以实现消息中转，增加UE和UE之间的通信距离，提高通信质量。
本实施例的方案可以应用于用户设备侧，如由UE执行。
所述辅链路可以为第一终端和第二终端之间的通信链路，其中，所述第一终端和第二终端之一为辅链路发送UE(Transmit Sidelink UE，简称Tx-UE)，其中之另一位辅链路接收UE(Received Sidelink UE，简称Rx-UE)。
所述Tx-UE可以是通过辅链路通信的两个终端中发送数据传输的一方，相应的，所述Rx-UE可以是接收数据传输的一方。
所述Rx-UE还可以是通过辅链路通信的两个终端中监听链路质量的一方。关于所述Tx-UE和Rx-UE的描述还可以参考现有或将来协议中的相关规定。
本实施例的方案可以由Rx-UE执行，也可以由Tx-UE执行。即本实施例的方案可以由通过辅链路通信的两个终端之一来执行。
接下来以所述第二终端执行本实施例所述方案为例进行详细阐述。其中，所述第二终端可以为Rx-UE，也可以为Tx-UE。
具体地，参考图1，本实施例所述用于辅链路的中继选择方法可以包括如下步骤：
步骤S101，接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；
步骤S102，根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；
步骤S103，将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
为便于表述，本实施例将所述第一终端与任一中继的链路质量均记作第一链路质量，将所述第二终端与任一中继的链路质量均记作第二链路质量。其中，所述链路质量也可以称为信道质量。
在一个非限制性实施例中，在所述步骤S101之前，本实施例所述中继选择方法还可以包括步骤：根据所述辅链路的链路质量判断是否触发中继选择操作。
例如，参考图2，在已有一对辅链路UE(即所述第一终端和第二终端)进行辅链路传输的前提下，所述第一终端21和第二终端22均可以分别执行操作s1，以检测所述辅链路的链路质量，并判断是否需要触发本实施例所述中继选择流程。
在一个非限制性实施例中，所述链路质量可以是根据对应的信道状态信息确定的，所述信道状态信息至少可以选自：RSRP、接收信号强度指示(Received Signal Strength Indication，简称RSSI)、参考信号接收质量(Reference Signal Received Quality，简称RSRQ)、层1信号与干扰加噪声比(Layer 1Signal to Interference Plus Noise Ratio，简称L1-SINR)以及信道质量指示(Channel Quality Indication，简称CQI)。在实际应用中，本领域技术人员还可以测量其他能够反映链路质量的参数来监测所述辅链路的信道质量。
例如，对所述辅链路的信道状态信息的测量可以是针对下列信道或者RS之一进行的，但不局限于这些信道或者RS：物理辅链路共享信道(Physical Sidelink Shared Channel，简称PSSCH)或者PSSCH的解调参考信号(Demodulation Reference Signal，简称DMRS)；物 理辅链路发现信道(Physical Sidelink Discovery Channel，简称PSDCH)或者PSDCH的DMRS；辅链路信道状态信息参考信号(Sidelink Channel State Information-Reference Signal，简称S-CSI-RS)；物理辅链路控制信道(Physical Sidelink Control Channel，简称PSCCH)或者PSCCH的DMRS；物理辅链路反馈信道(Physical Sidelink Feedback Channel，简称PSFCH)或者PSFCH的DMRS；辅链路同步信号块(Sidelink Synchronization Signal/Physical Broadcast Channel Block，简称SL-SSB)、辅链路主同步信号(Sidelink Primary Synchronization Signal，简称S-PSS)、辅链路辅同步信号(Sidelink Secondary Synchronization Signal，简称S-SSS)、辅链路物理广播信道(Physical Sidelink Broadcast Channel，简称PSBCH)或者辅链路PSBCH的DMRS、辅链路相位追踪参考信号(Sidelink Phase-tracking Reference Signal，简称S-PTRS)。
在一个具体实施中，可以根据以上任一个或任多个参数测量得到所述链路质量。
进一步地，当所述信道状态信息低于预设触发阈值时，可以确定触发所述中继选择操作。其中，所述预设触发阈值可以是通过高层信令配置的，或者，也可以是预定义(pre-configure)的。
所述高层信令可以选自：无线资源控制(Radio Resource Control，简称RRC)、系统信息块(System Information Block，简称SIB)以及媒体访问控制层控制单元(Media Access Control-Control Element，简称MAC-CE)。
相应的，在执行本实施例所述中继选择流程时，通过测量所述第一终端与中继之间的链路的信道状态信息，可以得到所述第一链路质量；通过测量所述第二终端与中继之间的链路的信道状态信息，可以得到所述第二链路质量。
进一步地，不同的辅链路可以对应不同或者相同的预设触发阈值。其中，所述预设触发阈值可以由基站的高层信令配置或者预先定 义。
在一个具体实施中，所述第一终端和第二终端之间的辅链路可以是双向的，因而，在进行触发判断时，当所述第一终端和第二终端之一的测量结果表明与对端的链路质量低于所述预设触发阈值时，即可确定触发所述中继选择操作。
在一个变化例中，可以在所述第一终端和第二终端的双向链路的链路质量均低于所述预设触发阈值时，才确定触发所述中继选择操作。
在一个变化例中，所述第一终端和第二终端中作为Tx-UE的一方可以接收作为Rx-UE一方的CQI汇报或者RSRP汇报。如果所述CQI或RSRP低于所述预设触发阈值，则作为Tx-UE的一方可以确定触发所述中继选择或者重选择操作。
在一个变化例中，所述第一终端和第二终端中作为Rx-UE的一方可以通过其测量的CQI或者RSRP来判断是否触发所述中继选择或者重选择操作。如果所述CQI或RSRP低于所述预设触发阈值，则作为Rx-UE的一方可以确定触发所述中继选择操作。
在一个变化例中，还可以同时配置另一参数(hysteresis，以下称为预设调整量)，当所述链路质量低于所述预设触发阈值减去所述参数(hysteresis)后的值时，确定触发所述中继选择或者重选择操作。在一个具体实施中，所述预设调整量可以用于更好的避免乒乓效应。
在一个非限制性实施例中，所述第一终端和第二终端可以将自己测量获得的信道状态信息汇报至基站，由所述基站执行触发判断操作。相应的，在执行所述步骤S101之前，本实施例所述中继选择方法还可以包括步骤：接收启动指令，所述启动指令用于触发所述中继选择操作。其中，所述启动指令可以是由所述基站发送的。
在一个具体实施中，所述启动指令可以通过高层信令或者辅链路控制信息(Sidelink Control Information，简称SCI)分别发送至所述 第一终端和第二终端，以使两者均立即进入中继选择流程。
在一个变化例中，所述启动指令可以仅发送至所述第一终端或第二终端，由接收到所述启动指令的终端通过高层信令或者SCI通知另一终端进入中继选择流程。优选地，接收所述启动指令的终端可以是所述第一终端和第二终端中当前作为Rx-UE的终端。
在一个非限制性实施例中，基站可以通过高层信令或者下行控制信息(Downlink Control Information，简称DCI)来指示第一终端和/或第二终端进行中继选择或者中继重选择操作。
在一个非限制性实施例中，基站可以通过高层信令或者DCI来指示第一终端和/或第二终端终止中继操作。即，指示第一终端和/或第二终端不能使用中继进行通信。
在一个非限制性实施例中，第一终端可以通过高层信令或者SCI来指示第二终端进行中继选择或者中继重选择操作。
在一个变化例中，当所述中继选择操作是由基站指示触发时，所述操作s1可以被省略。
在一个非限制性实施例中，当第一终端不需要再继续进行中继服务时，第一终端可以通过高层信令或者SCI来指示第二终端和/或中继和/或基站其终止中继操作。即，指示第一与第二终端不能或者不需要继续使用中继进行通信。可选的，中继或者基站在收到第一终端发送的所述高层信令或者SCI指示之后，可以再通过高层信令或者SCI指示通知第二终端不能或者不需要继续使用中继进行通信。
在一个非限制性实施例中，第一终端可以通过高层信令或者SCI来指示第二终端终止中继操作。即，指示第二终端不能使用中继进行通信。在一个非限制性实施例中，在所述步骤S101之前，本实施例所述中继选择方法还可以包括步骤：发送第二消息，所述第二消息用于请求获取所述第一候选中继集合。
例如，继续参考图2，假设所述第二终端22执行所述操作s1确 定触发中继选择操作，则所述第二终端22可以执行操作s2，以向所述第一终端21发送所述第二消息，从而指示所述第一终端21进入中继选择流程。
进一步地，所述第二消息可以由高层信令承载，如RRC、SIB或MAC-CE。
或者，所述第二消息也可以由动态指示承载，如SCI。
在一个变化例中，当所述中继选择流程是响应于基站的启动指令触发时，所述操作s2可以被省略。
在一个非限制性实施例中，所述第二消息还可以用于指示所述第一候选中继集合包括的候选中继的数量。
在一个非限制性实施例中，在发送第二消息之后，所述步骤S101之前，本实施例所述中继选择方法还可以包括步骤：接收第三消息，所述第三消息可以包括第二消息接收成功反馈信息。
例如，继续参考图2，响应于接收到所述第二消息，所述第一终端21可以确定与所述第二终端22的辅链路需要设置中继。
相应的，所述第一终端21可以执行操作s3，以向所述第二终端22发送所述第三消息。
进一步地，所述第三消息可以通过PSCCH或PSSCH承载。与所述第二消息类似，所述第三消息也可以通过高层信令或动态指示承载。例如，所述动态指示可以包括控制信息指示。
在一个变化例中，所述操作s3可以被省略，在发送所述第二消息后，所述第二终端22可以立即进行周围中继的测量操作，以得到所述第二候选中继集合。进一步地，响应于接收到所述第二消息，所述第一终端21可以立即执行操作s4。
在一个非限制性实施例中，继续参考图2，响应于接收到所述第二消息，所述第一终端21可以执行操作s4，以测量自己与周围可能 的中继的第一链路质量。
例如，所述第一终端21可以测量周围可能的中继与所述第一终端21之间的信道质量。
具体地，所述第一终端21可以基于与周围可能的中继的链路的信道状态信息确定所述第一链路质量。
在一个变化例中，所述操作s3和操作s4可以是同步或异步执行的。或者，所述操作s3可以被省略。
在一个非限制性实施例中，继续参考图2，所述第一终端21可以将周围可能的中继中符合条件的中继作为候选中继组成所述第一候选中继集合，并执行操作s5，以将所述第一候选中继集合通过第一消息发送至第二终端22。所述操作s5可以理解为与所述步骤S101相呼应的步骤。
与所述第二消息类似，所述第一消息也可以通过高层信令或动态指示承载。
在一个具体实施中，所述符合条件的中继是指，所述第一终端21与所述中继的第一链路质量达到所述预设阈值。其中，所述预设阈值可以根据所述预设触发阈值确定。
例如，所述第一终端21可以测量周围一中继发送的参考信号或者信道的RSRP，并且，当测量得到的RSRP大于所述预设触发阈值时，可以确定该中继符合条件。
又例如，所述第一终端21可以测量周围一中继发送的参考信号或者信道的RSRP，如果测量得到的RSRP大于所述预设触发阈值与预设调整量(hysteresis)之和，则可以确定该中继符合条件。或者，所述第一终端21还可以测量周围一中继发送的其他信道状态信息来确定该中继是否符合条件。
进一步地，所述预设调整量可以通过高层信令配置或者预先定 义。
进一步地，所述链路质量可以基于信道状态信息来衡量。
在一个具体实施中，所述第一候选中继集合可以包括所述第一终端测量得到的所有符合条件的中继。
在一个变化例中，当所述第二消息还指示有所述第一候选中继集合包括的候选中继的数量n时，所述第一终端可以从测量得到的所有符合条件的中继中选择第一链路质量最高的n个中继组成所述第一候选中继集合。
例如，所述第二消息中指示的数量n＝4，相应的，所述第一候选中继集合可以包含RSRP最大的4个中继。
在一个变化例中，所述数量n可以用于指示第一终端需要反馈的满足特定要求的n个候选中继；或者，可以是信道质量最好的n个候选中继；或者，可以是能够测量得到的附近中继中任意的n个候选中继。
在一个变化例中，所述数量n可以是由基站通过高层信令或SCI指示给第一终端和/或第二终端的。
或者，所述数量n还可以是预先定义好的。
在一个变化例中，所述第一候选中继集合可以仅包括测量得到的所有符合条件的中继中第一链路质量最高的中继。
在一个变化例中，所述第一候选中继集合可以包括测量得到的所有符合条件的中继，不论该中继的第一链路质量是否满足条件。
在一个变化例中，所述第一候选中继集合可以由所述第一终端自主决定集合中的元素。
进一步地，所述第一候选中继集合可以包含所述候选中继的标识(Identification，简称ID)，和/或各候选中继的第一链路质量。具体地，这些信息可以通过PSSCH承载。
在一个变化例中，图2示出的一个或多个操作均可以省略。在一个非限制性实施例中，参考图3，所述步骤S102可以包括如下步骤：
步骤S1021，确定第二候选中继集合，所述第二候选中继集合包括至少一个与所述第二终端的第二链路质量达到所述预设阈值的候选中继；
步骤S1022，获取所述第一候选中继集合与所述第二候选中继集合的交集；
步骤S1023，将所述交集中的候选中继确定为所述优选中继。
由此，将通过中继实现数据传输的两端UE与中继的信道质量均纳入中继选择的考量，利于确保最终选定的优选中继对于通过辅链路进行通信的两端UE均是较合适的。
例如，继续参考图2，响应于接收到所述第一消息，所述第二终端22可以执行操作s6，以确定所述第二候选中继集合，并从与所述第一候选中继集合的交集中选择所述优选中继。
具体地，在所述步骤S1021中，与前述操作s4相类似，所述第二终端22也可以测量自己与周围可能的中继的第二链路质量。
例如，所述第二终端22可以测量周围可能的中继发送的参考信号或者信道的RSRP，并将RSRP符合条件的中继组成所述第二候选中继集合。
关于所述符合条件的中继的描述可以参考上述关于第一候选中继集合的相关描述，在此不予赘述。
在一个具体实施中，用于判断中继是否能加入第一候选中继集合的预设触发阈值，与用于判断中继是否能加入第二候选中继集合的预设触发阈值可以相同，也可以不相同。用于判断中继是否能加入第一候选中继集合的预设调整量，与用于判断中继是否能加入第二候选中继集合的预设调整量可以相同，也可以不相同。
在一个具体实施中，所述第二候选中继集合可以包括所述第二终端测量得到的所有符合条件的中继。
在一个变化例中，所述第二候选中继集合包括的中继数量可以等于所述第二终端在所述第二消息中指示的数量。
在一个变化例中，所述第二候选中继集合可以仅包括测量得到的所有符合条件的中继中第二链路质量最高的中继。
在一个变化例中，所述第二候选中继集合可以包括测量得到的所有符合条件的中继，不论该中继的第二链路质量是否满足条件。
在一个变化例中，所述第二候选中继集合包括的中继数量可以由基站通过高层信令配置或者预定义确定。
进一步地，所述第二候选中继集合可以包含所述候选中继的标识(Identification，简称ID)，还可以包括各候选中继的第二链路质量。
进一步地，在所述步骤S1022中，通过比较候选中继的ID，可以得到所述第一候选中继集合和第二候选中继集合的交集，也即，同时记录于所述第一候选中继集合和第二候选中继集合中的候选中继。该交集可以记作第三候选中继集合。
在一个变化例中，如果所述第一候选中继集合和第二候选中继集合没有交集，则所述第二终端可以重新发送第二消息至第一终端，以重新进行中继选择流程。
或者，所述第二终端可以认为目前没有合适的中继可以服务，进而直接结束中继选择操作。可选的，第二终端可以通过高层信令告知基站其没有找到合适的中继可以服务。
在一个非限制性实施例中，在所述步骤S1023中，当所述第三候选中继集合仅包括一个候选中继时，可以将该候选中继确定为所述优选中继。
在一个非限制性实施例中，当所述交集中候选中继的数量为多个 时，也即，当所述第三候选中继集合包括多个候选中继时，所述第二终端可以从所述第三候选中继集合中选取一个候选中继作为所述优选中继。
在一个具体实施中，所述第二终端可以从所述第三候选中继集合中随机选择一个候选中继作为所述优选中继。所述优选中继即为所述辅链路的服务中继。
在一个具体实施中，可以从所述第三候选中继集合中选择max i min{RSRPi-1,RSRPi-2}对应的的候选中继作为所述优选中继，其中，max i min{A i,B i}函数用于从A i和B i中选取最小值的后，从所有最小值中选择最大的数值对应的A i或B i，RSRPi-1为第i个候选中继与第一终端的第一链路质量，RSRPi-2为第i个候选中继与第二终端的第二链路质量。
也即，针对所述第三候选中继集合中的每一候选中继，将该候选中继的第一链路质量和第二链路质量中的最小值作为选择标准，将各最小值中数值最大的候选中继确定为所述优选中继。例如，假设所述第三候选中继集合包括{relay-1,relay-2}，其中，第1个候选中继(relay-1)与第一终端的第一链路质量RSRP1-1＝3，第1个候选中继(relay-1)与第二终端的第二链路质量RSRP1-2＝5，第2个候选中继(relay-2)与第一终端的第一链路质量RSRP2-1＝2，第2个候选中继(relay-2)与第二终端的第二链路质量RSRP2-2＝7。此时，min{RSRP1-1,RSRP1-2}＝3,min{RSRP2-1,RSRP2-2}＝2,根据max i min{}准则，此时应当选择relay-1作为所述优选中继。
在一个变化例中，除RSRP外，max i min{}函数中的参数也可以替换为其他能够衡量链路质量的参数。
在一个具体实施中，参考图4，所述步骤S1023可以包括如下步骤：
步骤S10231，对于所述交集中的每一候选中继，分别确定所述 候选中继与所述第一终端的第一链路质量，以及所述候选中继与所述第二终端的第二链路质量；
步骤S10232，将所述交集中第三链路质量最高的候选中继选择为所述优选中继，其中，所述第三链路质量根据所述第一链路质量和第二链路质量确定。
具体地，所述第三链路质量可以是所述第一链路质量和第二链路质量的四则运算结果。
例如，对于每一候选中继，所述第三链路质量可以为所述第三候选中继集合中第一链路质量和第二链路质量的加和。
又例如，对于每一候选中继，所述第三链路质量可以为所述第三候选中继集合中第一链路质量和第二链路质量的乘积。
在一个具体实施中，所述步骤S1021可以在图2所示操作s4之前/之后/同时执行。
图3和图4所示实施例可以应用于第一终端和第二终端不是实时监测周边中继的链路质量的场景。
在一个非限制性实施例中，参考图5，所述步骤S102可以包括如下步骤：
步骤S1028，对于所述第一候选中继集合中的每一候选中继，获取所述候选中继与所述第二终端的第二链路质量；
步骤S1029，将所述第二链路质量最高的候选中继确定为所述优选中继。
与上述图3和图4所示实施例的区别在于，在本实施例中，所述第二终端在接收所述第一消息之前，可以不进行任何操作，并在接收到所述第一消息后，直接从所述第一候选中继集合中选择合适的候选中继作为服务中继。
在一个变化例中，所述第一候选中继集合中的各候选中继可以按 第一链路质量由高到低的顺序排列。
响应于接收到所述第一消息，所述第二终端可以自排序最靠前的候选中继开始，依次测量与每一候选中继的第二链路质量，若当前测量的候选中继的所述第二链路质量减去预设调整量后仍大于所述预设触发阈值，则可以确定该候选中继为所述优选中继。
图5所示实施例可以应用于第一终端和第二终端实时监测周边中继的链路质量的场景。
在一个非限制性实施例中，在所述步骤S102之后，本实施例所述中继选择方法还可以包括步骤：发送第四消息，所述第四消息可以包括所述优选中继。
例如，所述第四消息可以包含所述优选中继的标识。
例如，继续参考图2，在所述操作s6之后，所述第二终端22还可以执行操作s7，以向所述第一终端21发送所述第四消息。
在一个非限制性实施例中，在所述步骤S102之后，本实施例所述中继选择方法还可以包括步骤：当所述第一终端与所述优选中继的第一链路质量低于所述预设阈值，和/或所述第二终端与所述优选中继的第二链路质量低于所述预设阈值时，重新选择中继。
例如，继续参考图2，在所述操作s7之后，所述第一终端21和第二终端22选定所述优选中继并基于所述优选中继进行辅链路通信后，所述第一终端21和第二终端22均可以测量自己与所述优选中继的链路质量。
当第一终端21和第二终端22中的任一终端测量发现自己与所述优选中继的链路质量低于所述预设阈值时，确定所述优选中继已经不再适合于所述辅链路，并执行操作s8，以触发对端进行中继重选择操作
作为一个变化例，当第一终端21和第二终端22中同时测量发现 自己与所述优选中继的链路质量低于所述预设阈值时，确定所述优选中继已经不再适合于所述辅链路，并执行操作s8，以触发对端进行中继重选择操作。
在一个具体实施中，当所述第一链路质量低于所述预设触发阈值减去预设调整量时，确定需要重新选择中继。或者，当所述第一链路质量低于所述预设触发阈值时，确定需要重新选择中继。
在一个具体实施中，当所述第二链路质量低于所述预设触发阈值减去预设调整量时，确定需要重新选择中继。或者，当所述第二链路质量低于所述预设触发阈值时，确定需要重新选择中继。
在一个具体实施中，当所述第一链路质量低于所述预设触发阈值减去预设调整量，并且，所述第二链路质量低于所述预设触发阈值减去预设调整量时，确定需要重新选择中继。或者，当所述第一链路质量低于所述预设触发阈值，并且，所述第二链路质量低于所述预设触发阈值时，确定需要重新选择中继。
进一步地，关于所述中继重选择操作的具体流程，可以参考本实施例关于所述中继选择操作的具体描述，两者的最大区别在于触发时机不同。
需要注意的是，在本实施例中，触发中继选择或中继重选择操作的阈值判断条件可以是：链路质量低于预设触发阈值(threshold)，或者，链路质量低于触发阈值(threshold)减去预设调整量(hysteresis)后的值。
确定中继符合条件的判断标准可以是：链路质量高于预设触发阈值(threshold)，或者，链路质量高于触发阈值(threshold)与预设调整量(hysteresis)之和。
由上，采用本实施例的方案，能够提供一种适用于UE-to-UE中继场景的中继选择逻辑，确保辅链路中互为通信对端的两个UE之间在通信距离受限或者信道质量受限的情况下仍能正常通信。具体而 言，较之现有技术仅考虑执行中继选择的UE自身与中继之间的信道质量的中继选择逻辑，本实施例方案将作为接收端的UE与中继的信道质量也纳入中继选择的考量，使得最终选定的优选中继对于通过辅链路进行通信的两端UE均是较合适的。
在本实施例的一个变化例中，当第一终端或第二终端确定接下来的通信不需要中继服务时，所述第一终端或第二终端可以将中止中继服务的请求发送至所述中继或基站。其中，所述请求可以由高层信令承载。
图6是本发明实施例的一种用于辅链路的中继选择装置的结构示意图。本领域技术人员理解，本实施例所述用于辅链路的中继选择装置6(以下简称为中继选择装置6)可以用于实施上述图1至图5所示实施例中所述的方法技术方案。
具体地，所述辅链路可以为第一终端和第二终端之间的通信链路。
更为具体地，参考图6，本实施例所述中继选择装置6可以包括：接收模块61，用于接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；选择模块62，用于根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；确定模块63，用于将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
关于所述中继选择装置6的工作原理、工作方式的更多内容，可以参照上述图1至图5中的相关描述，这里不再赘述。
进一步地，本发明实施例还公开一种存储介质，其上存储有计算机指令，所述计算机指令运行时执行上述图1至图5所示实施例中所述的方法技术方案。优选地，所述存储介质可以包括诸如非挥发性(non-volatile)存储器或者非瞬态(non-transitory)存储器等计算机 可读存储介质。所述存储介质可以包括ROM、RAM、磁盘或光盘等。
进一步地，本发明实施例还公开一种终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，所述处理器运行所述计算机指令时执行上述图1至图5所示实施例中所述的方法技术方案。优选地，所述终端可以是5G用户终端。
图7是本发明实施例的另一种用于辅链路的中继选择方法的流程图。
在图7所示实施例中，第五消息由第一终端发送，第六消息由第二终端发送，第四链路指的是中继和第一终端之间的链路，第五链路指的是中继和第二终端之间的链路。
具体地，参考图7，本实施例所述中继选择方法可以包括：步骤S201，接收第五消息和/或第六消息。
其中，所述第五消息可以包含第四链路的链路质量达到预设阈值的终端信息；所述第六消息可以包含第五链路的链路质量达到预设阈值的终端信息。
例如，中继可以接收第一终端发送的第五消息。此时，可以由所述第一终端主导是否通过中继进行辅链路通信。
又例如，中继可以接收第二终端发送的第六消息。此时，可以由所述第二终端主导是否通过中继进行辅链路通信。
再例如，中继可以分别接收第一终端发送的第五消息，以及第二终端发送的第六消息。执行本实施例方案的终端可以根据第五消息和第六消息确定自身能否为第一终端和第二终端之间的辅链路提供中继服务。
进一步地，所述第五消息还可以包含其他与所述中继的链路质量达到所述预设阈值的终端的终端信息。类似的，所述第六消息还可以包含其他与所述中继的链路质量达到所述预设阈值的终端的终端信 息。
在一个具体实施中，所述第五消息或第六消息可以包含下列至少一个信息：
1.第一终端标识(Identification，简称ID)；
2.第二终端ID；
3.第一终端ID和第二终端ID；
4.第四链路的信道状态信息；
5.第五链路的信道状态信息；
6.中继ID。
其中，所述第一终端ID可以标识或者唯一标识第一终端。
所述第二终端ID可以标识或者唯一标识第二终端。
所述中继ID可以标识或者唯一标识中继。其中，可以包含多个中继ID。
所述中继ID的数目可以由基站通过高层信令配置或者由第一终端或者第二终端自行决定或者预先定义。
作为一个非限制性实施例，所述第五消息中的中继需要满足第四链路的信道状态信息大于一个阈值。
例如，第五消息中包含的中继需要满足其对应的第四链路的信道的RSRP或者RSSI或者RSRQ或者CQI或者L1-SINR大于一个阈值。其中，阈值可以由基站通过高层信令配置或者预先定义。
作为一个非限制性实施例，所述第六消息中的中继需要满足第五链路的信道状态信息大于一个阈值。
例如，第六消息中包含的中继需要满足其对应的第五链路的信道的RSRP或者RSSI或者RSRQ大于一个阈值。其中，阈值可以由基 站通过高层信令配置或者预先定义。
继续参考图7，本实施例所述中继选择方法还可以包括：步骤S202，中继根据收到的第五消息和/或第六消息，确定所述中继可以为哪些终端进行中继服务。
作为一个实施例，根据在第五消息和/或第六消息中获得的第一终端和/或第二终端的信道状态信息，如果所述中继与第一终端的链路质量满足信道质量要求，同时所述中继与第二终端的链路质量也满足信道质量要求，那么所述中继确定自身可以为所述第一终端与第二终端提供中继服务。
作为一个变化例，如果同时存在多个第一终端与第二终端满足信道质量要求，此时可以由中继实现决定具体为哪一组或者哪些组第一终端与第二终端提供中继服务。
作为一个变化例，如果同时存在多个第一终端与第二终端满足信道质量要求，此时可以由中继选择第一终端与第二终端组中，对应着max i min{RSRPi-1,RSRPi-2}中最终选定的那一组进行中继服务。其中，RSRPi-1为第i个第一终端与所述中继的链路质量，RSRPi-2为第i个第二终端与所述中继的链路质量。
作为一个变化例，如果同时存在多个第一终端与第二终端满足信道质量要求，此时可以由中继可以选择第一终端与第二终端组中，对应着RSRPi-1+RSRPi-2最大的那一组进行中继服务。其中，RSRPi-1为第i个第一终端与所述中继的链路质量，RSRPi-2为第i个第二终端与所述中继的链路质量。
作为一个变化例，如果同时存在多个第一终端与第二终端满足信道质量要求，此时可以由中继可以选择第一终端与第二终端组中，对应着RSRPi-1×RSRPi-2最大的那一组进行中继服务。其中，RSRPi-1为第i个第一终端与所述中继的链路质量，RSRPi-2为第i个第二终端与所述中继的链路质量。
作为一个变化例，除RSRP外，还可以选用其他能够衡量链路质量的参数作为选定依据，如RSSI、CQI、L1-SINR、RSRQ等。
继续参考图7，本实施例所述中继选择方法还可以包括：步骤S203，中继发送第七消息，所述第七消息可以用于指示所述中继可以为哪些终端进行中继服务。
在一个具体实施中，所述第七消息可以包含下列至少一个信息：
1.第一终端ID
2.第二终端ID
3.第一终端ID和第二终端ID
4.中继ID
所述中继ID可以是发送第七消息的中继ID。
在本实施例的一个典型应用场景中，参考图8，在已有一对辅链路UE(如第一终端31和第二终端32)进行辅链路传输的前提下，所述第一终端31和第二终端32可以分别执行操作s11，以检测所述辅链路的链路质量，并判断是否需要触发本实施例所述中继选择流程。
在一个变化例中，第一终端31需要和第二终端32通过辅链路进行通信，但是第一终端31没有成功检测到第二终端32的存在，和/或第二终端32没有成功检测到第一终端31的存在，此时触发中继选择流程。
其中，第一终端31可以通过第二终端32发送的参考信号或者信道的强度以及其所携带的信息来判断第二终端32的存在。
具体来说，参考信号或者信道可以是下列之一：
1.辅链路SSB
2.辅链路PSS
3.辅链路SSS
4.辅链路PSBCH
5.辅链路PSBCH的DMRS
6.辅链路PSDCH
7.辅链路PSDCH的DMRS
8.辅链路PSSCH和/或PSCCH
9.辅链路PSSCH的DMRS和/或PSCCH的DMRS
10.辅链路CSI-RS
11.辅链路PSFCH
12.辅链路PSFCH的DMRS
13.辅链路PTRS
在一个变化例中，所述操作s11可以被省略。
进一步地，所述第二终端32可以执行操作s12，以测量自身和中继之间的链路质量，从而判断哪些中继可以是候选中继。
作为一个实施例，第二终端32可以测量与中继33之间的信道质量(也可称为链路质量)，也即第五链路的信道质量。其中，信道质量可以通过测量中继33发送的参考信号或者信道来获得。具体来说，中继33可能的发送的参考信号或者信道可以包含下列至少一种：
1.辅链路SSB
2.辅链路PSS
3.辅链路SSS
4.辅链路PSBCH
5.辅链路PSBCH的DMRS
6.辅链路PSDCH
7.辅链路PSDCH的DMRS
8.辅链路PSSCH和/或PSCCH
9.辅链路PSSCH的DMRS和/或PSCCH的DMRS
10.辅链路CSI-RS
11.辅链路PSFCH
12.辅链路PSFCH的DMRS
13.辅链路PTRS
其中，第二终端32可以测量第五链路的信道的RSRP或者RSSI或者RSRQ或CQI或者L1-SINR。如果第五链路的信道的RSRP或者RSSI或者RSRQ或者CQI或者L1-SINR大于一个阈值，那么所述第五链路对应的中继33就可以选为候选中继，并置于第四集合中，对应着操作s12。其中，所述第四集合中包含有第五链路满足信道质量要求的中继信息。可选的，UE可以选择第四集合中信道质量最好的中继作为最终候选中继，并将其对应的中继信息至于第六消息中。
类似的，第一终端31可以执行操作s13，以测量自身与中继之间的第四链路的链路质量，从而判断哪些中继可以是候选中继。
在触发中继选择或者中继重选择之后，第一终端31可以执行操作s14，以发送第五消息。
类似的，在触发中继选择或者中继重选择之后，第二终端32可以执行操作s15，以发送第六消息。
在一个变化例中，所述操作s12和/或s15可以被省略。
在所述操作s13中，第一终端31可以测量与中继33之间的信道质量，也即第四链路的信道质量。其中，信道质量可以通过测量中继33发送的参考信号或者信道来获得。具体来说，中继33可能的发送 的参考信号或者信道可以包含下列至少一种：
1.辅链路SSB
2.辅链路PSS
3.辅链路SSS
4.辅链路PSBCH
5.辅链路PSBCH的DMRS
6.辅链路PSDCH
7.辅链路PSDCH的DMRS
8.辅链路PSSCH和/或PSCCH
9.辅链路PSSCH的DMRS和/或PSCCH的DMRS
10.辅链路CSI-RS
11.辅链路PSFCH
12.辅链路PSFCH的DMRS
13.辅链路PTRS
其中，第一终端31可以测量第四链路的信道的RSRP或者RSSI或者RSRQ或CQI或者L1-SINR。如果第四链路的信道的RSRP或者RSSI或者RSRQ或者CQI或者L1-SINR大于一个阈值，那么所述第四链路对应的中继就可以选为候选中继，并置于第五集合中，对应着操作s13。其中，所述第五集合中包含有第四链路满足信道质量要求的中继信息。可选的，UE可以选择第五集合中信道质量最好的中继作为最终候选中继，并将其对应的中继信息至于第五消息中。
在触发中继选择或者中继重选择之后，第一终端31可以执行操作s14即发送第五消息。
在一个变化例中，所述操作s13和/或s14可以被省略。
进一步地，响应于接收到所述第五消息和/或第六消息，所述中继33可以执行操作s16，以根据收到的第五消息和/或第六消息确定具体可以为哪一个第一终端与第二终端组进行中继服务。
进一步地，中继33可以执行操作s17和操作s18，以发送第七消息，所述第七消息可以用于指示所述中继33可以为哪些终端进行中继服务。
可选的，第七消息的目标终端可以是第一终端31也可以是第二终端32，或者，所述第七消息可以分别发送至所述第一终端31和第二终端32。
进一步地，响应于接收到所述第七消息，所述第一终端31和/或第二终端32可以反馈其是否正确接收第七消息。
例如，参考图8，响应于接收到所述第七消息，所述第一终端31可以执行操作s19，以向所述中继33发送反馈信息，所述反馈信息用于指示已成功接收到所述第七消息。
进一步地，响应于接收到所述第一终端31发送的反馈信息，所述中继33可以执行操作s20，以向第二终端32发送第八消息。其中，所述第八消息可以用于指示所述中继33可以为哪些终端进行中继服务。
在一个变化例中，图8示出的一个或多个操作均可以省略。
本申请实施例中的终端可以指各种形式的用户设备、接入终端、用户单元、用户站、移动站、移动台(mobile station，简称MS)、远方站、远程终端、移动设备、用户终端、终端设备(terminal equipment)、无线通信设备、用户代理或用户装置。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，简称SIP)电话、无线本地环路(Wireless Local Loop，简称WLL)站、个人数字处理(Personal Digital Assistant，简称PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设 备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，简称PLMN)中的终端设备等，本申请实施例对此并不限定。
应理解，本文中术语“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。另外，本文中字符“/”，表示前后关联对象是一种“或”的关系。
本申请实施例中出现的“多个”是指两个或两个以上。
本申请实施例中出现的第一、第二等描述，仅作示意与区分描述对象之用，没有次序之分，也不表示本申请实施例中对设备个数的特别限定，不能构成对本申请实施例的任何限制。
本申请实施例中出现的“连接”是指直接连接或者间接连接等各种连接方式，以实现设备间的通信，本申请实施例对此不做任何限定。
本申请实施例中出现的“网络”与“系统”表达的是同一概念，通信系统即为通信网络。
应理解，本发明实施例中，所述处理器可以为中央处理单元(Central Processing Unit，简称CPU)，该处理器还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，简称DSP)、专用集成电路(Application Specific Integrated Circuit，简称ASIC)、现成可编程门阵列(Field Programmable Gate Array，简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本发明实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，简称ROM)、可编程只读存储器(Programmable ROM，简称PROM)、可擦除可编程只读 存储器(Erasable PROM，简称EPROM)、电可擦除可编程只读存储器(Electrically EPROM，简称EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，简称RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(Random Access Memory，简称RAM)可用，例如静态随机存取存储器(Static RAM，简称SRAM)、动态随机存取存储器(Dynamic Random Access Memory，简称DRAM)、同步动态随机存取存储器(Synchronous DRAM，简称SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，简称DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，简称ESDRAM)、同步连接动态随机存取存储器(Synchronous connection to DRAM，简称SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，简称DR-RAM)。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例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指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令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，所述计算机指令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合的服务器、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，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并 不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
在本申请所提供的几个实施例中，应该理解到，所揭露的方法、装置和系统，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理包括，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元，可以存储在一个计算机可读取存储介质中。上述软件功能单元存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，简称ROM)、随机存取存储器(Random Access Memory，简称RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
虽然本发明披露如上，但本发明并非限定于此。任何本领域技术人员，在不脱离本发明的精神和范围内，均可作各种更动与修改，因此本发明的保护范围应当以权利要求所限定的范围为准。

Claims (14)

  1. 一种用于辅链路的中继选择方法，所述辅链路为第一终端和第二终端之间的通信链路，其特征在于，所述中继选择方法包括：
    接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；
    根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；
    将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
  2. 根据权利要求1所述的中继选择方法，其特征在于，所述根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继包括：
    确定第二候选中继集合，所述第二候选中继集合包括至少一个与所述第二终端的第二链路质量达到所述预设阈值的候选中继；
    获取所述第一候选中继集合与所述第二候选中继集合的交集；
    将所述交集中的候选中继确定为所述优选中继。
  3. 根据权利要求2所述的中继选择方法，其特征在于，当所述交集中候选中继的数量为多个时，所述将所述交集中的候选中继确定为所述优选中继包括：
    对于所述交集中的每一候选中继，分别确定所述候选中继与所述第一终端的第一链路质量，以及所述候选中继与所述第二终端的第二链路质量；
    将所述交集中第三链路质量最高的候选中继选择为所述优选中继，其中，所述第三链路质量根据所述第一链路质量和第二链路质量确定。
  4. 根据权利要求1所述的中继选择方法，其特征在于，所述根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继包括：
    对于所述第一候选中继集合中的每一候选中继，获取所述候选中继与所述第二终端的第二链路质量；
    将所述第二链路质量最高的候选中继确定为所述优选中继。
  5. 根据权利要求1所述的中继选择方法，其特征在于，在接收第一消息之前，还包括：
    发送第二消息，所述第二消息用于请求获取所述第一候选中继集合。
  6. 根据权利要求5所述的中继选择方法，其特征在于，所述第二消息还用于指示所述第一候选中继集合包括的候选中继的数量。
  7. 根据权利要求5所述的中继选择方法，其特征在于，在发送第二消息之后，接收第一消息之前，还包括：
    接收第三消息，所述第三消息包括第二消息接收成功反馈信息。
  8. 根据权利要求1所述的中继选择方法，其特征在于，还包括：
    发送第四消息，所述第四消息包括所述优选中继。
  9. 根据权利要求1所述的中继选择方法，其特征在于，在接收第一消息之前，还包括：
    根据所述辅链路的链路质量判断是否触发中继选择操作或者，
    接收启动指令，所述启动指令用于触发所述中继选择操作。
  10. 根据权利要求1所述的中继选择方法，其特征在于，还包括：
    当所述第一终端与所述优选中继的第一链路质量低于所述预设阈值，和/或所述第二终端与所述优选中继的第二链路质量低于所述预设阈值时，重新选择中继。
  11. 根据权利要求1至10中任一项所述的中继选择方法，其特征在于，对于所述第一链路质量和第二链路质量中的任一链路质量，所述链路质量是根据对应的信道状态信息确定的，所述信道状态信息至少选自：RSRP、RSSI、RSRQ、L1-SINR以及CQI。
  12. 一种用于辅链路的中继选择装置，所述辅链路为第一终端和第二终端之间的通信链路，其特征在于，所述中继选择装置包括：
    接收模块，用于接收第一消息，所述第一消息包括第一候选中继集合，所述第一候选中继集合包括至少一个与所述第一终端的第一链路质量达到预设阈值的候选中继；
    选择模块，用于根据所述第二终端与所述第一候选中继集合中至少一个候选中继的第二链路质量，从所述第一候选中继集合中选择优选中继；
    确定模块，用于将所述优选中继确定为所述第一终端和第二终端在所述辅链路上的中继。
  13. 一种存储介质，其上存储有计算机指令，其特征在于，所述计算机指令运行时执行权利要求1至11任一项所述方法的步骤。
  14. 一种终端，包括存储器和处理器，所述存储器上存储有能够在所述处理器上运行的计算机指令，其特征在于，所述处理器运行所述计算机指令时执行权利要求1至11任一项所述方法的步骤。
PCT/CN2020/108108 2019-08-16 2020-08-10 用于辅链路的中继选择方法及装置、存储介质、终端 WO2021031896A1 (zh)

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