WO2024020862A1 - 侧行链路的切换方法、装置、设备、系统及介质 - Google Patents

侧行链路的切换方法、装置、设备、系统及介质 Download PDF

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Publication number
WO2024020862A1
WO2024020862A1 PCT/CN2022/108277 CN2022108277W WO2024020862A1 WO 2024020862 A1 WO2024020862 A1 WO 2024020862A1 CN 2022108277 W CN2022108277 W CN 2022108277W WO 2024020862 A1 WO2024020862 A1 WO 2024020862A1
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Prior art keywords
terminal
remote terminal
sidelink
remote
target
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PCT/CN2022/108277
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English (en)
French (fr)
Inventor
张博源
卢前溪
冷冰雪
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Oppo广东移动通信有限公司
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Priority to PCT/CN2022/108277 priority Critical patent/WO2024020862A1/zh
Publication of WO2024020862A1 publication Critical patent/WO2024020862A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the present application relates to the field of sidelink communication, and in particular to sidelink switching methods, devices, equipment, systems and media.
  • the remote terminal can connect to the network device through a direct link or through a relay link, that is, through a relay link.
  • the relay terminal establishes a connection between the remote terminal and the network device.
  • Embodiments of the present application provide a sidelink link switching method, device, equipment, system and medium, which can be used for the terminal-to-terminal relay switching process in sidelink communication.
  • the technical solution is as follows:
  • a sidelink link switching method is provided, the method is performed by a first remote terminal, and the method includes:
  • the first remote terminal sends a PC5-RRC connection establishment request to the target terminal.
  • the PC5-RRC connection establishment request is used to request the establishment of a target sidelink between the first remote terminal and the target terminal. , to switch the source sidelink between the first remote terminal and the source terminal;
  • the first remote terminal receives the PC5-RRC connection establishment response sent by the target terminal.
  • a sidelink link switching method is provided, the method is executed by a target terminal, and the method includes:
  • the target terminal receives a PC5-RRC connection establishment request sent by the first remote terminal.
  • the PC5-RRC connection establishment request is used to request the establishment of a target sidelink between the first remote terminal and the target terminal. path to switch the source sidelink between the first remote terminal and the source terminal;
  • the target terminal sends a PC5-RRC connection establishment response to the first remote terminal.
  • a sidelink link measurement reporting method is provided.
  • the method is executed by a first remote terminal.
  • the method includes:
  • the target sidelink is a sidelink between the first remote terminal and the target terminal
  • the source sidelink is a sidelink between the first remote terminal and the source terminal. road.
  • a method for releasing a sidelink is provided.
  • the method is performed by a first remote terminal.
  • the method includes:
  • the first remote terminal releases the source sidelink when the first timer stops or times out;
  • the source sidelink is a sidelink between the first remote terminal and the source terminal
  • the first timer is when the first remote terminal sends a PC5-RRC connection establishment request. or, the first timer is started by the first remote terminal according to the first message.
  • a method for releasing a sidelink is provided.
  • the method is performed by a serving relay terminal.
  • the method includes:
  • the serving relay terminal releases the side link between the serving relay terminal and the second remote terminal.
  • a method for releasing a sidelink is provided.
  • the method is performed by a second remote terminal.
  • the method includes:
  • the third timer is stopped.
  • a method for determining the status of a sidelink is provided.
  • the method is performed by a first remote terminal.
  • the method includes:
  • the received second message indicates that the sidelink link quality between the serving relay terminal and the second remote terminal is lower than a tenth threshold value
  • a method for selecting a sidelink is provided.
  • the method is performed by a first remote terminal.
  • the method includes:
  • the relay terminal is added to the appropriate relay terminal set;
  • a terminal device which includes: a processor; a transceiver connected to the processor; a memory for storing executable instructions of the processor; wherein, the The processor is configured to load and execute the executable instructions to implement the sidelink switching method as described in the above aspect.
  • a network device includes: a processor; a transceiver connected to the processor; a memory for storing executable instructions of the processor; wherein, the The processor is configured to load and execute the executable instructions to implement the switching method of the sensing node sidelink as described in the above aspect.
  • a computer-readable storage medium in which executable instructions are stored in the computer program product, and the executable instructions are loaded and executed by the processor to implement the above aspect.
  • Sidelink switching method is provided, in which executable instructions are stored in the computer program product, and the executable instructions are loaded and executed by the processor to implement the above aspect.
  • a computer program product is provided, executable instructions are stored in the computer program product, and the executable instructions are loaded and executed by the processor to implement the side processing as described in the above aspect.
  • Link switching method is provided.
  • a chip includes a programmable logic circuit and/or program instructions, and is used to implement the sidelink switching method as described in the above aspect when the chip is running.
  • a communication system includes at least two terminal devices, or a terminal device and a network device.
  • the terminal device and the network device are used to implement the above aspect.
  • the sidelink switching method is provided.
  • the first remote terminal sends a PC5-RRC connection establishment request to the target terminal, thereby switching the source sidelink with the source terminal to the target terminal according to the PC5-RRC connection establishment response fed back by the target terminal.
  • Target sidelink thereby realizing the switching process between terminals and terminal relays, and improving the flexibility of communication between terminals in sidelink communication scenarios.
  • FIG. 1 shows a schematic diagram of transmission mode A in the related art
  • FIG. 2 shows a schematic diagram of transmission mode B in the related art
  • Figure 3 shows a flow chart of a sidelink switching method provided by an exemplary embodiment of the present application
  • Figure 4 shows a flow chart of a sidelink link measurement reporting method provided by an exemplary embodiment of the present application
  • Figure 5 shows a flow chart of a sidelink release method provided by an exemplary embodiment of the present application
  • Figure 6 shows a schematic diagram of the application process of the first timer provided by an exemplary embodiment of the present application
  • Figure 7 shows a flow chart of a sidelink release method provided by an exemplary embodiment of the present application.
  • Figure 8 shows a flow chart of a sidelink release method provided by an exemplary embodiment of the present application.
  • Figure 9 shows a flow chart of a method for determining the status of a sidelink provided by an exemplary embodiment of the present application.
  • Figure 10 shows a flow chart of a sidelink selection method provided by an exemplary embodiment of the present application
  • Figure 11 shows a flow chart of a PDCP retransmission method provided by an exemplary embodiment of the present application
  • Figure 12 shows a flow chart of a sidelink switching method provided by an exemplary embodiment of the present application
  • Figure 13 shows a structural block diagram of a sidelink switching device provided by an exemplary embodiment of the present application.
  • Figure 14 shows a structural block diagram of a sidelink switching device provided by an exemplary embodiment of the present application.
  • Figure 15 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application.
  • first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other.
  • first information may also be called second information, and similarly, the second information may also be called first information.
  • word “if” as used herein may be interpreted as "when” or “when” or “in response to determining.”
  • device-to-device communication is a side link transmission technology based on device-to-device communication (D2D). It is different from the communication data in traditional cellular systems through The base station receives or transmits in different ways.
  • the Internet of Vehicles system uses terminal-to-terminal direct communication, so it has higher spectrum efficiency and lower transmission delay. There are two transmission modes defined in 3GPP: Mode A and Mode B.
  • FIG. 1 it shows transmission mode A.
  • mode A the transmission resources between terminal 101 and terminal 102 are allocated by base station 103.
  • Terminal 101 and terminal 102 are on the sideline according to the resources allocated by base station 103.
  • Data is sent on the link; the base station 103 can allocate single transmission resources to the terminal 101 and the terminal 102, or can allocate semi-static transmission resources to the terminal 101 and the terminal 102.
  • the terminal 201 selects a resource in the resource pool for data transmission.
  • D2D is divided into different stages for research, including Proximity based Service (ProSe), Vehicle to X (V2X), Wearable Devices (Further Enhancements to LTE Device to Device, FeD2D) , multi-carrier.
  • Proximity based Service Proximity based Service
  • V2X Vehicle to X
  • Wearable Devices Further Enhancements to LTE Device to Device, FeD2D
  • multi-carrier multi-carrier.
  • ProSe Device-to-device communication in Rel-12/13 is studied for ProSe scenarios, which are mainly targeted at public safety services.
  • the resource pool is discontinuous in the time domain, so that the user equipment (User Equipment, UE) can send/receive data discontinuously on the sidelink, thereby achieving saving Electrical effect.
  • User Equipment User Equipment
  • V2X In Rel-14/15, the Internet of Vehicles system is studied for vehicle-to-vehicle communication scenarios, which is mainly oriented to relatively high-speed moving vehicle-to-vehicle and vehicle-to-human communication services.
  • V2X since the vehicle system has continuous power supply, power efficiency is not the main issue, but the delay of data transmission is the main issue. Therefore, the system design requires the terminal equipment to transmit and receive continuously.
  • FeD2D In Rel-14, this scenario studies the scenario of wearable devices accessing the network through mobile phones. It is mainly oriented to low mobile speed and low power access scenarios. In FeD2D, during the pre-research phase, 3GPP concluded that the base station can configure the DRX parameters of the remote terminal through a relay terminal. However, since this topic has not further entered the standardization stage, there is no conclusion on the specific details of how to configure DRX.
  • Multi-carrier In Rel-15 LTE V2X, a multi-carrier mechanism is introduced. Specifically, the multi-carrier mechanism is reflected in that the UE can support data packet segmentation and use multiple carriers to transmit data packets to improve the data transmission rate; data packet replication, Copy the same data packet twice and send it using two carriers to improve transmission reliability; and enhance multi-carrier reception at the receiving end.
  • V2X side-chain communication supports side-chain packet replication and is executed at the UE's Packet Data Convergence Protocol (PDCP) layer.
  • PDCP Packet Data Convergence Protocol
  • PDU Packet Data Convergence Protocol
  • the duplicate packet data protocol (Packet Data Protocol, pdp) pdu of the same PDCP entity is submitted to two different Radio Link Control (Radio Link Control, RLC) entities and associated to two different side chain logical channels respectively.
  • Duplicate PDPPDUs of the same PDCP entity are only allowed to be transmitted on different sidechain carriers.
  • the UE can activate or deactivate sidechain packet replication based on (pre)configuration. Sidechain packet replication does not apply to transports with Rel-14 transport profile (TS 23.285[72]).
  • ProSe Per-Packet Reliability (PPPR) values in distance-based services that support sidechain packet replication can be (pre-)configured through PPPR thresholds.
  • the UE shall perform side-chain packet replication for data with configured PPPR values until packet replication is unconfigured for these PPPR values.
  • the UE reports the amount of data associated with one or more PPPR values and the destination to which the data belongs through the side chain buffer status report (Buffer Status Report, BSR).
  • BSR Side Chain buffer Status Report
  • the mapping of PPPR values to logical channel groups may be configured by the eNB, and the PPPR values are reflected by the associated logical channel group ID included in the side chain BSR.
  • a list of one or more PPPR values may be reported by a Radio Resource Control (RRC) connected UE in sidechain UE information.
  • RRC Radio Resource Control
  • NR V2X is not limited to broadcast scenarios based on LTE V2X, but has been further expanded to unicast and multicast scenarios. The application of V2X is studied in these scenarios.
  • NR V2X will also define the above two resource authorization modes mode-1/2; further, users may be in a mixed mode, that is, they can use mode-1 to obtain resources and at the same time Use mode-2 to obtain resources.
  • the resource acquisition is indicated through sidelink authorization, that is, the sidelink authorization indicates the time when the corresponding physical sidelink control channel (PSCCH) and physical sidelink shared channel (PysicalSidelink Share Channel, PSSCH) resources frequency location.
  • PSCCH physical sidelink control channel
  • PSSCH Physical Sidelink shared channel
  • NR V2X introduces feedback-based HARQ retransmission, which is not limited to unicast communication, but also includes multicast communication;
  • the sidelink terminal will trigger the sidelink RRC reconfiguration process in the following scenarios:
  • CSI Channel State Information
  • DRX Discontinuous Reception
  • the remote terminal performs the handover process between the direct link and the relay link.
  • the remote terminal performs measurement reporting and includes the relay terminal identification, serving cell identification, reference signal received power (RSRP) measurement and other information in the measurement reporting information.
  • RSRP reference signal received power
  • the remote terminal performs link switching from the relay link to the direct link, for the serving relay terminal, it is more recommended to use SL-RSRP for measurements on the sidelink; when the remote terminal performs direct link During link handover to the trunk link, SD-RSRP is used for measurements on the sidelink.
  • two new measurement reporting trigger events are defined for terminal to network relay handover.
  • Event 1 when the link quality of the serving relay terminal is lower than the configured threshold, and, optionally, the link quality of the adjacent cell is higher than the configured threshold, the remote terminal performs measurement reporting;
  • Event 2 When the link quality of the serving cell is lower than the configured threshold, and, optionally, when the link quality of the candidate relay terminal is higher than the configured threshold, the remote terminal performs measurement reporting.
  • a new timer is introduced. When the remote terminal receives an RRC reconfiguration message indicating direct link to relay link handover, The remote terminal starts the timer. When the timer expires, the remote terminal performs RRC re-establishment.
  • FIG. 3 shows a flow chart of a sidelink switching method provided by an exemplary embodiment of the present application.
  • This embodiment uses the example of the method being executed by the first remote terminal to illustrate, where: A remote terminal is a terminal device participating in sidelink communications. The method includes the following steps:
  • Step 310 The first remote terminal sends a PC5-RRC connection establishment request to the target terminal.
  • the above PC5-RRC connection establishment request is used to request the establishment of a target sidelink between the first remote terminal and the target terminal, so as to switch the source sidelink between the first remote terminal and the source terminal. That is, the source sidelink between the first remote terminal and the source terminal is switched to the target sidelink between the first remote terminal and the target terminal through the PC5-RRC connection establishment request.
  • the sidelink switching involved in the embodiments of this application can be implemented in the following scenarios:
  • the source terminal is a second remote terminal
  • the target terminal is a target relay terminal
  • the source side link is a side direct link
  • the target side link is a side relay link. That is, the first remote terminal and the second remote terminal currently communicate through a side direct link, and the side direct link needs to be switched to a side relay link implemented through the target relay terminal.
  • the source terminal is a serving relay terminal
  • the target terminal is a target relay terminal
  • both the source sidelink and the target sidelink are sidelink relay links. That is, the first remote terminal and the second remote terminal currently communicate through the side relay link provided by the serving relay terminal, and it is necessary to switch the above-mentioned side relay link with the serving relay terminal to that with the serving relay terminal. Sideline relay link between target relay terminals.
  • the source terminal is a serving relay terminal
  • the target terminal is a second remote terminal
  • the source sidelink is a sidelink relay link
  • the target sidelink is a sidelink direct link. That is, the first remote terminal and the second remote terminal currently communicate through the side relay link provided by the serving relay terminal, and it is necessary to switch the above-mentioned side relay link with the serving relay terminal to that with the serving relay terminal. Direct side link to the second remote terminal.
  • the PC5-RRC connection establishment request carries at least one of the following information: the identifier of the second remote terminal; the identifier of the serving relay terminal; the terminal-to-terminal relay service identifier; the identifier of the first remote terminal Capability information; resource pool configuration of the first remote terminal; discontinuous reception configuration of the first remote terminal.
  • the first remote terminal receives a first message, and the first message is used to indicate the target terminal. That is, the first remote terminal determines the target terminal to be subjected to link switching according to the first message.
  • the first message is sent by at least one of the following entities: a network device connected to the first remote terminal; a service relay terminal connected to the first remote terminal; Two remote terminals.
  • the first message is carried in at least one of the following signaling: RRC message; PC5-RRC message; PC5-S message.
  • the first remote terminal can also determine the target terminal by itself, that is, the first remote terminal does not need to receive the first message.
  • the first remote terminal receives a configuration of the link quality threshold S.
  • the first message is configured with a link quality threshold S between the first remote terminal and the target terminal during the handover process.
  • the link quality threshold S is configured based on the following granularity: first remote terminal; target terminal; layer 2 target address identification.
  • Step 320 The first remote terminal receives the PC5-RRC connection establishment response sent by the target terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal.
  • the PC5-RRC connection establishment response also includes at least one of the following information: capability information of the target terminal; bearer configuration of the target terminal; resource pool configuration of the target terminal; discontinuous reception configuration of the target terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to reject the PC5-RRC connection establishment request of the first remote terminal.
  • the source terminal is a serving relay terminal and the source side link is a side link
  • the first remote terminal has released the source side link with the serving relay terminal
  • the first remote terminal performs relay terminal reselection; when the first remote terminal does not release the source side link with the serving relay terminal, the first remote terminal continues to perform measurement reporting to the serving relay terminal.
  • the sidelink measurement involved in this implementation can be measured through SL-RSRP or SD-RSRP.
  • the handover execution process of the sidelink of the first remote terminal includes:
  • the first remote terminal receives the first message, and the first message is used to indicate the target terminal;
  • the first message carries the terminal identification of the target terminal
  • the target terminal includes the target relay terminal or the second remote terminal.
  • the first message is sent by at least one of the following entities: a network device connected to the first remote terminal; a service relay terminal connected to the first remote terminal; Two remote terminals.
  • the first message is configured with a link quality threshold S between the first remote terminal and the target terminal used in the handover process.
  • the link quality threshold S can be configured according to the following granularity: each first remote terminal is configured with an S; each second remote terminal/target relay terminal is configured with an S; each layer 2 target address The logo is configured with an S.
  • the first remote terminal sends a PC5-RRC connection establishment request to the target terminal;
  • the PC5-RRC connection establishment request carries at least one of the following information: the second remote terminal ID; the serving relay terminal ID; the terminal-to-terminal relay service identifier; the first remote terminal capability information; the first The bearer configuration of the remote terminal; the resource pool configuration of the first remote terminal; and the discontinuous reception configuration of the first remote terminal.
  • the first remote terminal receives the PC5-RRC connection establishment response sent by the target terminal;
  • the PC5-RRC connection establishment response may carry at least one of the following information: accepting the PC5-RRC connection establishment request of the first remote terminal; rejecting the PC5-RRC connection establishment request of the first remote terminal.
  • the target terminal accepts the PC5-RRC connection establishment request of the first remote terminal, it further includes at least one of the following information: capability information of the target terminal; bearer configuration of the target terminal; resource pool configuration of the target terminal; Discontinuous receive configuration.
  • the first remote terminal sends a PC5-RRC connection establishment request to the target terminal, thereby realizing the connection with the source terminal according to the PC5-RRC connection establishment response fed back by the target terminal.
  • the source sidelink is switched to the target sidelink with the target terminal, thereby realizing the switching process between terminals and terminal relays, and improving the flexibility of communication between terminals in the sidelink communication scenario.
  • the first remote terminal before performing sidelink link switching, the first remote terminal will perform measurement reporting on the relay link, thereby ensuring handover accuracy during the sidelink link switching process.
  • Figure 4 shows a flow chart of a sidelink link measurement reporting method provided by an exemplary embodiment of the present application. This embodiment takes the method as being executed by the first remote terminal as an example. Note that this method includes the following steps:
  • Step 410 When the sidelink quality of the target sidelink and/or the source sidelink meets the measurement reporting triggering event, send a measurement report.
  • the target side link is a side link between the first remote terminal and the target terminal
  • the source side link is a side link between the first remote terminal and the source terminal.
  • the first remote terminal receives a measurement reporting configuration, where the measurement reporting configuration includes a measurement reporting triggering event.
  • the measurement reporting configuration is sent by any one of the following entities: the network device connected to the first remote terminal; the service relay terminal connected to the first remote terminal; the second remote terminal connected to the first remote terminal. remote terminal.
  • the measurement reporting configuration is carried in any of the following signaling: RRC message; PC5-RRC message; PC5-S message; SL MAC CE (SidelinkMedia Access Control Control Element, sidelink media access layer control unit); DL MAC CE (DownlinkMedia Access Control Control Element, downlink media access layer control unit); SCI (Subscriber Controlled Input, user input control); DCI (Downlink Control Information, downlink control information).
  • the above measurement reporting triggering event includes: a first event, and the first event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is higher than the first threshold.
  • the admission conditions for the first event include: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal minus the hysteresis value is greater than the first threshold value; the departure of the first event
  • the condition includes: the measured value of the sidelink link quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the first threshold value.
  • the above measurement reporting triggering event further includes: a second event, and the second event includes that the quality of the sidelink link between the serving relay terminal and the second remote terminal is higher than the second threshold.
  • the admission conditions for the second event include: the measured value of the sidelink quality between the serving relay terminal and the second remote terminal minus the hysteresis value is greater than the second threshold value; the departure of the second event
  • the condition includes: the measured value of the sidelink quality between the serving relay terminal and the second remote terminal plus the hysteresis value is less than the second threshold value.
  • the above measurement reporting triggering event includes: a third event, and the third event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than a third threshold.
  • the access conditions for the third event include: the measured value of the sidelink link quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the third threshold value; the departure of the third event
  • the condition includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal minus the hysteresis value is greater than the third threshold value.
  • the above measurement reporting triggering event further includes: a fourth event, and the fourth event includes that the quality of the sidelink link between the serving relay terminal and the second remote terminal is lower than a fourth threshold.
  • the access conditions for the fourth event include: the measured value of the sidelink link quality between the serving relay terminal and the second remote terminal plus the hysteresis value is less than the fourth threshold value; the departure of the fourth event
  • the condition includes: the measured value of the sidelink quality between the serving relay terminal and the second remote terminal minus the hysteresis value is greater than the fourth threshold value.
  • the above measurement reporting triggering event includes: a fifth event, and the fifth event includes that the quality of the sidelink link between the first remote terminal and the candidate relay terminal is higher than a fifth threshold.
  • the admission conditions for the fifth event include: the measured value of the sidelink quality between the first remote terminal and the candidate relay terminal minus the hysteresis value is greater than the fifth threshold; the departure of the fifth event
  • the condition includes: the measured value of the sidelink quality between the first remote terminal and the candidate relay terminal plus the hysteresis value is less than the fifth threshold value.
  • the above measurement reporting triggering event further includes: a sixth event.
  • the sixth event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than a sixth threshold.
  • the admission conditions for the sixth event include: the sidelink link quality plus the hysteresis value between the first remote terminal and the serving relay terminal is less than the sixth threshold; the departure conditions for the sixth event include: The sidelink link quality minus the hysteresis value between the first remote terminal and the serving relay terminal is greater than the sixth threshold value.
  • the above-mentioned measurement reporting triggering event includes: a seventh event, and the seventh event includes that the difference between the quality of the first sidelink and the quality of the second sidelink is greater than or equal to the first offset;
  • the first sidelink quality is the sidelink quality between the first remote terminal and the candidate relay terminal
  • the second sidelink quality is the sidelink quality between the first remote terminal and the candidate relay terminal.
  • the admission conditions for the seventh event include: the measured value of the first sidelink quality plus the first offset minus the hysteresis value is greater than the measured value of the second sidelink quality plus the first offset. shift and final offset; the departure conditions for the seventh event include: the measured value of the first sidelink quality plus the first offset minus the hysteresis value is less than the measured value of the second sidelink quality plus The first offset and the final offset; where the final offset includes the offset configured for the current measurement object.
  • the above-mentioned first offset and final offset are configured according to at least one of the following granularities: cell-level granularity; remote terminal-level granularity; relay terminal-level granularity; and service priority level granularity.
  • the above measurement reporting triggering event includes: an eighth event, and the eighth event includes that the difference between the quality of the third sidelink and the quality of the second sidelink is greater than or equal to the second offset;
  • the third sidelink quality is the sidelink quality between the first remote terminal and the second remote terminal
  • the second sidelink quality is the sidelink quality between the first remote terminal and the candidate relay terminal.
  • the access conditions for the eighth event include: the measured value of the third sidelink quality plus the second offset minus the hysteresis value is greater than the measured value of the second sidelink quality plus the second offset. shift plus the final offset; the departure conditions for the eighth event include: the measured value of the third sidelink quality plus the second offset minus the hysteresis value is less than the measured value of the second sidelink quality plus The second offset is added to the final offset; where the final offset includes the offset configured for the current measurement object.
  • the second offset and the final offset are configured according to at least one of the following granularities: cell level granularity; remote terminal level granularity; relay terminal level granularity; service priority level granularity.
  • the above measurement reporting triggering event includes: a ninth event, and the ninth event includes that the quality of the sidelink link between the first remote terminal and the second remote terminal is higher than the seventh threshold.
  • the access conditions for the ninth event include: the measured value of the sidelink quality between the first remote terminal and the second remote terminal minus the hysteresis value is greater than the seventh threshold value;
  • the leaving condition includes: the measured value of the sidelink quality between the first remote terminal and the second remote terminal plus the hysteresis value is less than a seventh threshold value.
  • the above measurement reporting triggering event includes: a tenth event, and the tenth event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than the eighth threshold.
  • the admission conditions for the tenth event include: the measured value of the sidelink link quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the eighth threshold; the departure of the tenth event
  • the condition includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal minus the hysteresis value is greater than an eighth threshold value.
  • the sidelink link quality between the serving relay terminal and the second remote terminal is notified to the first remote terminal by at least one of the following signaling: PC5-RRC message; PC5-S message ;Discovery message;SL-MAC CE;DCI.
  • the first remote terminal sends the measurement report to at least one of the following entities: the network device to which the first remote terminal is connected; the service relay terminal to which the first remote terminal is connected; the first remote terminal The second remote terminal to which the terminal is connected.
  • the above measurement report is carried in any one of the following signaling: RRC message; PC5-RRC message; PC5-S message; SL MAC CE; UL MAC CE; SCI; UCI (Uplink Control Information, uplink control information ).
  • the method provided by this embodiment ensures that when the sidelink quality of the target sidelink and/or the source sidelink meets the measurement reporting triggering event, the measurement report is reported. Handover accuracy of sidelink handover process.
  • the first remote terminal is configured with a first timer to control the release of the sidelink.
  • Figure 5 shows a flow chart of a sidelink release method provided by an exemplary embodiment of the present application. This embodiment takes the method being executed by the first remote terminal as an example to illustrate. , the method includes the following steps:
  • Step 510 The first remote terminal releases the source sidelink when the first timer stops or times out.
  • the source side link is a side link between the first remote terminal and the source terminal.
  • the first timer is started when the first remote terminal sends a PC5-RRC connection establishment request, or the first timer is started by the first remote terminal according to the first message.
  • the first timer may be started in at least one of the following situations:
  • the first remote terminal When the first remote terminal sends a PC5-RRC connection establishment request, the first remote terminal starts the first timer; or, the first remote terminal starts the first timer through the first message, and the first message is to indicate the target terminal.
  • the above-mentioned first message may be a message sent by the first remote terminal, that is, when the first remote terminal sends the first message, the first timer is started.
  • the above-mentioned first message is sent to at least one of the following entities: serving relay terminal; target relay terminal; second remote terminal.
  • the above-mentioned first message may include at least one of the following information: the second remote terminal ID; the service relay terminal ID; the terminal-to-terminal relay service identifier; the capability information of the first remote terminal; Bearer configuration of a remote terminal; resource pool configuration of the first remote terminal; discontinuous reception configuration of the first remote terminal.
  • the above-mentioned first message may also be a message received by the first remote terminal, that is, when the first remote terminal receives the first message, the first timer is started.
  • the above-mentioned first message is sent by at least one of the following entities: serving relay terminal; target relay terminal; second remote terminal.
  • the above-mentioned first message contains a switchable target relay terminal identification.
  • the first timer is stopped; or, when the first remote terminal sends a specified message, stop the first timer.
  • the above designated message is sent to at least one of the following entities: serving relay terminal; target relay terminal; second remote terminal.
  • the above designated message may include at least one of the following information: capability information of the serving relay terminal and/or the target relay terminal; bearer configuration of the serving relay terminal and/or the target relay terminal; in service The resource pool configuration of the relay terminal and/or the target relay terminal; the discontinuous reception configuration of the serving relay terminal and/or the target relay terminal.
  • the first remote terminal receives the configuration of the first timer.
  • the configuration of the first timer is sent by at least one of the following entities: a network device connected to the first remote terminal; a service relay terminal connected to the first remote terminal; The second remote terminal connected.
  • the first remote terminal reports the handover failure.
  • the first remote terminal fails to send a handover when the first timer times out; or the first remote terminal receives a PC5-RRC connection establishment response, and the PC5-RRC connection establishment response is used to indicate rejection.
  • the sending switch fails; or, in the case where the link measurement value of the first remote terminal sending the target terminal is lower than the link quality threshold S, the sending switch fails.
  • the first remote terminal reports the handover failure to at least one of the following entities: the network device to which the first remote terminal is connected; the service relay terminal to which the first remote terminal is connected; the second remote terminal.
  • the first remote terminal receives a configuration of the link quality threshold S.
  • the link quality threshold S is configured based on the following granularity: first remote terminal; target terminal; layer 2 target address identification.
  • the first remote terminal sends a connection release request to the source terminal.
  • the above connection release request is used to trigger the serving relay terminal to release the connection with the second remote terminal.
  • the above connection release request is indicated using at least one of the following signaling: PC5-RRC; PC5-S; SLMACCE; SCI.
  • the source sidelink and the target sidelink are both sidelinks.
  • the system includes a first remote terminal 601, a serving relay terminal 602, a second remote terminal 603 and a target relay terminal 604.
  • the process includes the following steps: S610, the serving relay terminal 602
  • the first remote terminal 601 sends the measurement reporting configuration;
  • S620, the first remote terminal 601 sends a measurement report to the serving relay terminal 602;
  • S630, the serving relay terminal 602 sends the first message to the first remote terminal 601.
  • the first The message is used to indicate the target relay terminal; S641, the first remote terminal 601 starts the first timer; S642, the first remote terminal 601 sends a PC5-RRC connection establishment request to the target relay terminal 604; S650, the target relay The terminal 604 sends a PC5-RRC connection establishment response to the first remote terminal 601.
  • the PC5-RRC connection establishment response indicates that the PC5-RRC connection establishment request of the first remote terminal 601 is accepted; S660, the first remote terminal 601 stops the first remote terminal 601. A timer.
  • the service relay terminal is configured with a second timer to control the release of the sidelink.
  • a second timer to control the release of the sidelink.
  • Step 710 When the second timer times out, the serving relay terminal releases the side link between the serving relay terminal and the second remote terminal.
  • the serving relay terminal receives the configuration of the second timer.
  • the configuration of the second timer is sent by at least one of the following entities: the network device to which the service relay terminal is connected; the first remote terminal to which the service relay terminal is connected; Second remote terminal.
  • the second timer is started.
  • the second timer is stopped.
  • the second remote terminal is configured with a third timer to control the release of the sidelink.
  • a third timer to control the release of the sidelink.
  • Figure 8 shows the side link provided by an exemplary embodiment of the present application.
  • the method is executed by the second remote terminal as an example. The method includes the following steps:
  • Step 810 When the second remote terminal receives the connection release request sent by the service relay terminal, the third timer is stopped.
  • connection release request is carried in any one of the following signaling: PC5-RRC; PC5-S; SL MAC CE; SCI.
  • the third timer is started.
  • the above-mentioned first message includes a switchable target relay terminal identifier.
  • the configuration of the third timer is sent by at least one of the following entities: the network device connected to the second remote terminal; the first remote device connected to the second remote terminal; the second remote terminal The connected service relay terminal.
  • the method provided by this embodiment controls the release of the sidelink by setting a timer in the first remote terminal and/or the service relay terminal and/or the second remote terminal, thereby improving the efficiency of Handover efficiency of sidelink handover process.
  • Figure 9 shows a flow chart of a method for determining the status of a sidelink provided by an exemplary embodiment of the present application.
  • This embodiment uses the example of the method being executed by the first remote terminal to illustrate the method. Includes the following steps:
  • Step 910 When the third sidelink quality and/or the fourth sidelink quality meet specified conditions, it is determined that the serving relay terminal is not suitable for continued selection.
  • the third sidelink quality is the quality of the sidelink between the first remote terminal and the serving relay terminal
  • the fourth sidelink quality is the quality of the sidelink between the serving relay terminal and the second remote terminal. sidelink quality.
  • the first remote terminal may consider that the serving relay terminal is not suitable for continued selection.
  • the ninth threshold value may be configured by at least one of the following entities: the second remote terminal connected to the first remote terminal; the network device connected to the first remote terminal; the first remote terminal The service relay terminal to which the terminal is connected.
  • the first remote terminal may consider that the serving relay terminal is not suitable for continued selection.
  • the above-mentioned second message may be indicated by the service relay terminal and/or the second remote terminal to the first remote terminal.
  • the second message uses at least one of the following signaling to indicate: PC5-RRC message; PC5-S message; SL MAC CE message; SCI.
  • the tenth threshold value may be configured by at least one of the following entities: the first remote terminal to which the second remote terminal is connected; the network device to which the second remote terminal is connected; the second remote terminal The connected service relay terminal.
  • the ninth threshold and the tenth threshold are configured according to at least one of the following granularities: QoS flow; Layer 2 target address; SL-RB (Sidelink-Resource Block, sidelink resource block) .
  • the method provided by this embodiment uses the sidelink link quality between the first remote terminal and the serving relay terminal and/or the sidelink link quality between the serving relay terminal and the second remote terminal.
  • the quality of the side link determines whether the serving relay terminal is suitable to continue to serve as a relay terminal, thereby ensuring that the first remote terminal performs side link switching under appropriate circumstances.
  • Figure 10 shows a flow chart of a sidelink link selection method provided by an exemplary embodiment of the present application.
  • This embodiment takes the method being executed by the first remote terminal as an example to illustrate. The method includes follow these steps:
  • Step 1010 If the adding conditions are met, add the relay terminal to the appropriate relay terminal set.
  • the added condition includes: the quality of the sidelink link between the first remote terminal and the relay terminal is higher than the eleventh threshold.
  • the added condition further includes: the quality of the sidelink link between the first remote terminal and the second remote terminal is lower than the twelfth threshold.
  • Step 1020 Select the serving relay terminal or the target relay terminal from the relay terminal set according to the selection method.
  • the selection method can be implemented as at least one of the following: the selection method is implemented by the first remote terminal; or the selection method is to select the relay terminal with the highest side link quality; or the selection method is implemented by the second remote terminal.
  • the end terminal instructs the first remote terminal.
  • the second remote terminal uses at least one of the following signaling to indicate: discovery message; SL MAC CE; SCI.
  • the method provided by this embodiment determines the appropriate relay terminal by adding conditions, and determines the serving relay terminal or the target relay terminal that participates in the establishment of the sidelink through selection, thereby ensuring the establishment of the side link. Sidelink reliability.
  • PDCP Packet Data Convergence Protocol, Packet Data Convergence Protocol
  • Retransmission Retransmission
  • FIG. 11 shows a flow chart of a PDCP retransmission method provided by an exemplary embodiment of the present application.
  • This embodiment takes the method being executed by the first remote terminal as an example to illustrate. The method includes the following steps:
  • Step 1110 The first remote terminal obtains the updated PDCP key through a specified method.
  • the above designated method includes at least one of the following methods: the first remote terminal obtains the updated PDCP through the upper layer of the first remote terminal; or the first remote terminal obtains the updated PDCP through the first remote terminal itself PDCP key; or, the first remote terminal obtains the updated PDCP key through the third message, and the third message is sent by the first remote terminal when the first remote terminal is switched from the current serving relay terminal to the target relay terminal.
  • the second remote terminal sends the message, or the third message is sent to the second remote terminal when the first remote terminal switches from the current serving relay terminal to the target relay terminal.
  • the third message is triggered by the second remote terminal after the target relay terminal sends a handover completion indication to the second remote terminal; or the third message is sent by the target relay terminal to the second remote terminal.
  • the completion instruction is sent by the first remote terminal to the second remote terminal through the target relay terminal.
  • Step 1120 The first remote terminal performs PDCP operation.
  • the first remote terminal is triggered by an upper layer of the first remote terminal to perform the PDCP operation; or the first remote terminal is triggered by the fourth message to perform the PDCP operation.
  • the above PDCP operation includes at least one of the following: PDCP reconstruction; PDCP data recovery; discarding stored PDCP PDUs (Protocol Data Unit, protocol data unit)/SDUs (ServiceData Unit, service data unit).
  • the fourth message is sent by the first remote terminal to the second remote terminal; or the fourth message is sent by the second remote terminal to the first remote terminal.
  • the fourth message uses at least one of the following signaling to indicate: PC5-RRC; PC5-S.
  • the method provided in this embodiment ensures the security of PDCP operations during the unicast connection process by updating the PDCP key.
  • FIG. 12 shows a flow chart of a sidelink switching method provided by an exemplary embodiment of the present application.
  • This embodiment takes the method being executed by a target terminal as an example for explanation. The method includes the following steps:
  • Step 1210 The target terminal receives the PC5-RRC connection establishment request sent by the first remote terminal.
  • the above PC5-RRC connection establishment request is used to request the establishment of a target sidelink between the first remote terminal and the target terminal, so as to switch the source sidelink between the first remote terminal and the source terminal.
  • the sidelink switching involved in the embodiments of this application can be implemented in the following scenarios:
  • the source terminal is a second remote terminal
  • the target terminal is a target relay terminal
  • the source side link is a side direct link
  • the target side link is a side relay link. That is, the first remote terminal and the second remote terminal currently communicate through a side direct link, and the side direct link needs to be switched to a side relay link implemented through the target relay terminal.
  • the source terminal is a serving relay terminal
  • the target terminal is a target relay terminal
  • both the source sidelink and the target sidelink are sidelink relay links. That is, the first remote terminal and the second remote terminal currently communicate through the side relay link provided by the serving relay terminal, and it is necessary to switch the above-mentioned side relay link with the serving relay terminal to that with the serving relay terminal. Sideline relay link between target relay terminals.
  • the source terminal is a serving relay terminal
  • the target terminal is a second remote terminal
  • the source sidelink is a sidelink relay link
  • the target sidelink is a sidelink direct link. That is, the first remote terminal and the second remote terminal currently communicate through the side relay link provided by the serving relay terminal, and it is necessary to switch the above-mentioned side relay link with the serving relay terminal to that with the serving relay terminal. Direct side link to the second remote terminal.
  • the PC5-RRC connection establishment request carries at least one of the following information: the identifier of the second remote terminal; the identifier of the serving relay terminal; the terminal-to-terminal relay service identifier; the identifier of the first remote terminal Capability information; resource pool configuration of the first remote terminal; discontinuous reception configuration of the first remote terminal.
  • the first remote terminal determines the target terminal to be subjected to link switching according to the first message.
  • the first message is sent by at least one of the following entities: a network device connected to the first remote terminal; a service relay terminal connected to the first remote terminal; Two remote terminals.
  • the first message is carried in at least one of the following signaling: RRC message; PC5-RRC message; PC5-S message.
  • the first remote terminal can also determine the target terminal by itself, that is, the first remote terminal does not need to receive the first message.
  • Step 1220 The target terminal sends a PC5-RRC connection establishment response to the first remote terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal.
  • the PC5-RRC connection establishment response also includes at least one of the following information: capability information of the target terminal; bearer configuration of the target terminal; resource pool configuration of the target terminal; discontinuous reception configuration of the target terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to reject the PC5-RRC connection establishment request of the first remote terminal.
  • Figure 13 shows a structural block diagram of a sidelink switching device provided by an exemplary embodiment of the present application.
  • the device includes at least some of the following modules:
  • the first sending module 1310 is used for the first remote terminal to send a PC5-RRC connection establishment request to the target terminal.
  • the PC5-RRC connection establishment request is used to request the establishment of the first remote terminal and the target terminal.
  • the target sidelink between the first remote terminal and the source terminal to switch the source sidelink between the first remote terminal and the source terminal;
  • the first receiving module 1320 is configured for the first remote terminal to receive the PC5-RRC connection establishment response sent by the target terminal.
  • the source terminal is a second remote terminal
  • the target terminal is a target relay terminal
  • the source sidelink is a side direct link
  • the target side link is a side link. line relay link
  • the source terminal is a serving relay terminal
  • the target terminal is a target relay terminal
  • the source side link and the target side link are both side line relay links path
  • the source terminal is a serving relay terminal
  • the target terminal is a second remote terminal
  • the source sidelink is a sidelink relay link
  • the target sidelink is a sidelink direct link.
  • the PC5-RRC connection establishment request carries at least one of the following information: the identifier of the second remote terminal; the identifier of the serving relay terminal; the terminal-to-terminal relay service identifier; Capability information of the first remote terminal; bearer configuration of the first remote terminal; resource pool configuration of the first remote terminal; discontinuous reception configuration of the first remote terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal; or, the PC5-RRC connection establishment response is used to indicate that the target terminal accepts the PC5-RRC connection establishment request of the first remote terminal; Instructing the target terminal to reject the PC5-RRC connection establishment request of the first remote terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal, and the PC5-RRC connection establishment response also includes the following information: At least one of: the capability information of the target terminal; the bearer configuration of the target terminal; the resource pool configuration of the target terminal; and the discontinuous reception configuration of the target terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to reject the PC5-RRC connection establishment request of the first remote terminal;
  • the source terminal is the serving relay terminal, so
  • the source sidelink is a sidelink relay link;
  • the device also includes:
  • a reselection module 1330 configured to perform relay terminal reselection when the first remote terminal has released the source side link with the serving relay terminal;
  • the first sending module 1310 is also configured to continue sending messages to the first remote terminal when the first remote terminal does not release the source side link with the serving relay terminal.
  • the above-mentioned service relay terminal performs measurement reporting.
  • the first receiving module 1320 is also configured for the first remote terminal to receive a first message, where the first message is used to indicate the target terminal.
  • the first message is sent by at least one of the following entities: a network device to which the first remote terminal is connected; a service relay terminal to which the first remote terminal is connected; A second remote terminal connected to the first remote terminal.
  • the first message is carried in at least one of the following signaling: RRC message; PC5-RRC message; PC5-S message.
  • the device further includes:
  • the release module 1340 is used for the first remote terminal to release the source side link when the first timer stops or times out.
  • the first receiving module 1320 is also used for the first remote terminal to receive the configuration of the first timer.
  • the configuration of the first timer is sent by at least one of the following entities: a network device connected to the first remote terminal; a service relay connected to the first remote terminal Terminal; a second remote terminal connected to the first remote terminal.
  • the device further includes a control module 1350;
  • the control module 1350 includes:
  • the starting unit 1351 is configured to start the first timer when the first remote terminal sends the PC5-RRC connection establishment request; or, the first remote terminal starts the first timer through the first message.
  • the first timer; the first message is used to indicate the target terminal.
  • control module 1350 also includes:
  • the stopping unit 1352 is configured to stop the first timer when the first remote terminal receives the PC5-RRC connection establishment response, and the PC5-RRC connection establishment response is used to indicate acceptance.
  • the first sending module 1310 is also configured to cause the first remote terminal to fail to send and switch when the first timer times out; or, the first remote terminal receives the When the PC5-RRC connection establishment response is used to indicate rejection, the handover fails; or the first remote terminal sends a link measurement value of the target terminal lower than In the case of link quality threshold S, transmission switching fails.
  • the first receiving module 1320 is also configured to receive the configuration of the link quality threshold S.
  • the link quality threshold S is configured based on the following granularity: the first remote terminal; the target terminal; and the layer 2 target address identification.
  • the first sending module 1310 is also configured to send a measurement report when a measurement reporting triggering event is met.
  • the first receiving module 1320 is further configured to receive a measurement reporting configuration, where the measurement reporting configuration includes the measurement reporting triggering event.
  • the measurement reporting configuration is sent by any one of the following entities: the network device connected to the first remote terminal; the service relay terminal connected to the first remote terminal; The second remote terminal to which the first remote terminal is connected.
  • the measurement reporting configuration is carried in any one of the following signaling: RRC message; PC5-RRC message; PC5-S message; SL MAC CE; DL MAC CE; SCI; DCI.
  • the measurement reporting triggering event includes: a first event, the first event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is higher than that of the first gate. limit.
  • the admission condition for the first event includes: a measured value of sidelink quality between the first remote terminal and the serving relay terminal minus a hysteresis value is greater than the first gate. Limit value; the leaving condition of the first event includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the first threshold value.
  • the measurement reporting triggering event further includes: a second event, the second event includes that the quality of the sidelink link between the serving relay terminal and the second remote terminal is higher than that of the second gate. limit.
  • the admission condition for the second event includes: a measured value of sidelink quality between the serving relay terminal and the second remote terminal minus a hysteresis value is greater than the second gate. Limit value; the leaving condition of the second event includes: the measured value of the sidelink link quality between the serving relay terminal and the second remote terminal plus the hysteresis value is less than the second threshold value.
  • the measurement reporting triggering event includes: a third event, the third event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than the third gate. limit.
  • the admission condition for the third event includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the third gate. Limit value; the leaving condition of the third event includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal minus the hysteresis value is greater than the third threshold value.
  • the measurement reporting triggering event further includes: a fourth event, the fourth event includes that the quality of the sidelink link between the serving relay terminal and the second remote terminal is lower than the fourth gate. limit.
  • the admission condition for the fourth event includes: the measured value of the sidelink quality between the serving relay terminal and the second remote terminal plus the hysteresis value is less than the fourth gate. Limit value; the leaving condition of the fourth event includes: the measured value of the sidelink quality between the serving relay terminal and the second remote terminal minus the hysteresis value is greater than the fourth threshold value.
  • the measurement reporting triggering event includes: a fifth event, the fifth event includes that the quality of the sidelink link between the first remote terminal and the candidate relay terminal is higher than the fifth gate. limit.
  • the admission condition for the fifth event includes: a measured value of sidelink quality between the first remote terminal and the candidate relay terminal minus a hysteresis value is greater than the fifth gate. Limit value; the leaving condition of the fifth event includes: the measured value of the sidelink quality between the first remote terminal and the candidate relay terminal plus the hysteresis value is less than the fifth threshold value.
  • the measurement reporting triggering event further includes: a sixth event, the sixth event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than the sixth gate. limit.
  • the admission condition for the sixth event includes: the sidelink link quality plus hysteresis value between the first remote terminal and the serving relay terminal is less than the sixth threshold value;
  • the leaving condition of the sixth event includes: the sidelink link quality minus the hysteresis value between the first remote terminal and the serving relay terminal is greater than the sixth threshold value.
  • the measurement reporting triggering event includes: a seventh event.
  • the seventh event includes that the difference between the quality of the first sidelink and the quality of the second sidelink is greater than or equal to the first deviation. Shift amount; wherein, the first sidelink quality is the sidelink quality between the first remote terminal and the candidate relay terminal, and the second sidelink quality is the first sidelink quality. Sidelink link quality between the remote terminal and the candidate relay terminal.
  • the admission condition for the seventh event includes: the measured value of the first sidelink quality plus the first offset minus the hysteresis value is greater than the second sidelink quality.
  • the departure condition of the seventh event includes: the measured value of the first sidelink quality plus the first offset
  • the amount minus the hysteresis value is less than the measured value of the second sidelink quality plus the first offset and the final offset
  • the final offset includes the offset configured for the current measurement object. Shift amount.
  • the first offset and the final offset are configured according to at least one of the following granularities: cell-level granularity; remote terminal-level granularity; relay terminal-level granularity; service priority level granularity.
  • the measurement reporting triggering event includes: an eighth event, the eighth event includes that the difference between the quality of the third sidelink and the quality of the second sidelink is greater than or equal to the second Offset; wherein the third sidelink quality is the sidelink quality between the first remote terminal and the second remote terminal, and the second sidelink quality is the Sidelink link quality between the first remote terminal and the candidate relay terminal.
  • the admission condition for the eighth event includes: the measured value of the third sidelink quality plus the second offset minus the hysteresis value is greater than the second sidelink quality.
  • the leaving condition of the eighth event includes: the measured value of the third sidelink quality plus the second offset.
  • the shift amount minus the hysteresis value is less than the measured value of the second sidelink quality plus the second offset plus the final offset; wherein the final offset includes the configuration configured for the current measurement object offset.
  • the second offset and the final offset are configured according to at least one of the following granularities: cell-level granularity; remote terminal-level granularity; relay terminal-level granularity; service priority level granularity.
  • the measurement reporting triggering event includes: a ninth event, the ninth event includes that the quality of the sidelink link between the first remote terminal and the second remote terminal is higher than the seventh event. threshold value.
  • the admission condition for the ninth event includes: a measured value of sidelink quality between the first remote terminal and the second remote terminal minus a hysteresis value is greater than the seventh event. Threshold value; the leaving condition of the ninth event includes: the measured value of the sidelink quality between the first remote terminal and the second remote terminal plus the hysteresis value is less than the seventh threshold value .
  • the measurement reporting triggering event further includes: a tenth event, the tenth event includes that the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than the eighth gate. limit.
  • the admission condition of the tenth event includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal plus the hysteresis value is less than the eighth gate Limit value; the leaving condition of the tenth event includes: the measured value of the sidelink quality between the first remote terminal and the serving relay terminal minus the hysteresis value is greater than the eighth threshold value.
  • the sidelink link quality between the serving relay terminal and the second remote terminal is notified to the first remote terminal by at least one of the following signaling: PC5-RRC Message; PC5-S message; Discovery message; SL-MAC CE; DCI.
  • the measurement report is sent to at least one of the following entities: a network device to which the first remote terminal is connected; a service relay terminal to which the first remote terminal is connected; The second remote terminal to which the first remote terminal is connected.
  • the measurement report is carried in any one of the following signaling: RRC message; PC5-RRC message; PC5-S message; SL MAC CE; UL MAC CE; SCI; UCI.
  • the device further includes:
  • Determining module 1360 configured to determine whether the first remote terminal and the serving relay terminal are connected to each other when the quality of the sidelink link between the first remote terminal and the serving relay terminal is lower than the ninth threshold A wireless link failure occurs between relay terminals; or, when the received second message indicates that the sidelink link quality between the serving relay terminal and the second remote terminal is lower than the tenth threshold value Next, it is determined that a wireless link failure occurs between the serving relay terminal and the second remote terminal.
  • the ninth threshold value and the tenth threshold value are configured according to at least one of the following granularities: QoS flow; Layer 2 target address; SL-RB.
  • the determining module 1360 also includes:
  • Adding unit 1361 is used to add the relay terminal to the appropriate relay terminal set when the adding conditions are met;
  • the selection unit 1362 is configured to select a service target relay terminal from the set of relay terminals in a selection manner.
  • the added condition includes: the quality of the sidelink link between the first remote terminal and the relay terminal is higher than an eleventh threshold.
  • the added condition further includes: the sidelink link quality between the first remote terminal and the second remote terminal is lower than a twelfth threshold.
  • the selection method is implemented by the first remote terminal; or the selection method is to select the relay terminal with the highest sidelink quality; or the selection method is by the second remote terminal.
  • the end terminal instructs the first remote terminal.
  • the second remote terminal uses at least one of the following signaling to indicate: discovery message; SL MAC CE; SCI.
  • the first receiving module 1320 is also configured for the first remote terminal to obtain the updated PDCP through the upper layer of the first remote terminal; or, the first remote terminal obtains the updated PDCP through the upper layer of the first remote terminal;
  • the first remote terminal obtains the updated PDCP key by itself; or, the first remote terminal obtains the updated PDCP key through a third message, and the third message is when the first remote terminal is changed from the current
  • the third message is sent by the second remote terminal when the serving relay terminal switches to the target relay terminal, or the third message is sent when the first remote terminal switches from the current serving relay terminal to the target relay terminal. sent to the second remote terminal.
  • the third message is triggered by the second remote terminal after the target relay terminal sends a handover completion indication to the second remote terminal; or, the third message is When the target relay terminal sends the handover completion indication to the second remote terminal, the first remote terminal sends it to the second remote terminal through the target relay terminal.
  • the device further includes:
  • the processing module 1370 is configured for the first remote terminal to perform a PDCP operation through an upper layer trigger of the first remote terminal; or, the first remote terminal to perform a PDCP operation through a fourth message trigger.
  • the PDCP operation includes at least one of the following: PDCP reconstruction; PDCP data recovery; discarding stored PDCP PDUs/SDUs.
  • the fourth message is sent by the first remote terminal to the second remote terminal; or the fourth message is sent by the second remote terminal to the third remote terminal. of a remote terminal.
  • Figure 14 shows a structural block diagram of a sidelink switching device provided by an exemplary embodiment of the present application.
  • the device includes at least some of the following modules:
  • the second receiving module 1410 is used for the target terminal to receive the PC5-RRC connection establishment request sent by the first remote terminal.
  • the PC5-RRC connection establishment request is used to request the establishment of the first remote terminal and the target. a target sidelink between terminals to switch a source sidelink between the first remote terminal and the source terminal;
  • the second sending module 1420 is configured for the target terminal to send a PC5-RRC connection establishment response to the first remote terminal.
  • the source terminal is a second remote terminal
  • the target terminal is a target relay terminal
  • the source sidelink is a side direct link
  • the target side link is a side link. line relay link
  • the source terminal is a serving relay terminal
  • the target terminal is a target relay terminal
  • the source side link and the target side link are both side line relay links path
  • the source terminal is a serving relay terminal
  • the target terminal is a second remote terminal
  • the source sidelink is a sidelink relay link
  • the target sidelink is a sidelink direct link.
  • the PC5-RRC connection establishment request carries at least one of the following information: the identifier of the second remote terminal; the identifier of the serving relay terminal; the terminal-to-terminal relay service identifier; Capability information of the first remote terminal; bearer configuration of the first remote terminal; resource pool configuration of the first remote terminal; discontinuous reception configuration of the first remote terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal; or, the PC5-RRC connection establishment response is used to indicate that the target terminal accepts the PC5-RRC connection establishment request of the first remote terminal; Instructing the target terminal to reject the PC5-RRC connection establishment request of the first remote terminal.
  • the PC5-RRC connection establishment response is used to instruct the target terminal to accept the PC5-RRC connection establishment request of the first remote terminal, and the PC5-RRC connection establishment response also includes the following information: At least one of: the capability information of the target terminal; the bearer configuration of the target terminal; the resource pool configuration of the target terminal; and the discontinuous reception configuration of the target terminal.
  • FIG. 15 shows a schematic structural diagram of a communication device (terminal device or network device) provided by an exemplary embodiment of the present application.
  • the communication device 1500 includes: a processor 1501, a receiver 1502, a transmitter 1503, a memory 1504 and a bus 1505 .
  • the processor 1501 includes one or more processing cores.
  • the processor 1501 executes various functional applications and information processing by running software programs and modules.
  • the receiver 1502 and the transmitter 1503 can be implemented as a communication component, and the communication component can be a communication chip.
  • Memory 1504 is connected to processor 1501 through bus 1505.
  • the memory 1504 can be used to store at least one instruction, and the processor 1501 is used to execute the at least one instruction to implement each step in the above method embodiment.
  • memory 1504 may be implemented by any type of volatile or non-volatile storage device, or combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable Read-only memory (Electrically Erasable Programmable Read Only Memory, EEPROM), Erasable Programmable Read-Only Memory (EPROM), Static Random-Access Memory (SRAM), read-only Memory (Read-Only Memory, ROM), magnetic memory, flash memory, programmable read-only memory (Programmable Read-Only Memory, PROM).
  • magnetic or optical disks electrically erasable programmable Read-only memory (Electrically Erasable Programmable Read Only Memory, EEPROM), Erasable Programmable Read-Only Memory (EPROM), Static Random-Access Memory (SRAM), read-only Memory (Read-Only Memory, ROM), magnetic memory, flash memory, programmable read-only memory (Programmable Read-Only Memory, PROM).
  • PROM Programmable Read-Only Memory
  • a computer-readable storage medium stores at least one program, and the at least one program is loaded and executed by the processor to implement each of the above methods.
  • the embodiment provides a sidelink switching method.
  • a chip is also provided.
  • the chip includes programmable logic circuits and/or program instructions. When the chip is run on a communication device, it is used to implement the side provided by each of the above method embodiments. Line link switching method.
  • a computer program product which when run on a processor of a computer device causes the computer device to perform the above sidelink switching method.
  • a communication system includes at least two terminal devices as described above, or a terminal device and a network device, for implementing the sidelink switching provided by each of the above method embodiments. method.
  • Computer-readable media includes computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • Storage media can be any available media that can be accessed by a general purpose or special purpose computer.

Abstract

本申请公开了一种侧行链路的切换方法、装置、设备、系统及介质，涉及侧行链路通信领域。该方法包括：第一远端终端向目标终端发送PC5-RRC连接建立请求，PC5-RRC连接建立请求用于请求建立第一远端终端和目标终端之间的目标侧行链路，以切换第一远端终端和源终端之间的源侧行链路；第一远端终端接收目标终端发送的PC5-RRC连接建立响应。该方法提升了侧行链路通信场景下终端和终端之间通信的灵活性。

Description

侧行链路的切换方法、装置、设备、系统及介质 技术领域
本申请涉及侧行链路通信领域，特别涉及侧行链路的切换方法、装置、设备、系统及介质。
背景技术
在Rel-17中，讨论了终端到网络进行通信的中继场景下，远端终端可以通过直接链路与网络设备进行连接，也可以通过中继链路与网络设备进行连接，即，通过中继终端建立远端终端和网络设备之间的连接。
在侧行链路(Sidelink，SL)传输技术的场景下，还提供有终端和终端之间的通信，相关技术中，针对终端和终端之间如何实现中继切换目前尚没有可行方案。
发明内容
本申请实施例提供了一种侧行链路的切换方法、装置、设备、系统及介质，可以用于侧行通信中终端到终端之间的中继切换过程。该技术方案如下：
根据本申请的一个方面，提供了一种侧行链路的切换方法，所述方法由第一远端终端执行，所述方法包括：
所述第一远端终端向目标终端发送PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
所述第一远端终端接收所述目标终端发送的PC5-RRC连接建立响应。
根据本申请的一个方面，提供了一种侧行链路的切换方法，所述方法由目标终端执行，所述方法包括：
所述目标终端接收第一远端终端发送的PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
所述目标终端向所述第一远端终端发送PC5-RRC连接建立响应。
根据本申请的一个方面，提供了一种侧行链路的测量上报方法，所述方法由第一远端终端执行，所述方法包括：
在目标侧行链路和/或源侧行链路的侧行链路质量满足测量上报触发事件的情况下，发送测量报告；
所述目标侧行链路是所述第一远端终端和目标终端之间的侧行链路，所述源侧行链路是所述第一远端终端和源终端之间的侧行链路。
根据本申请的一个方面，提供了一种侧行链路的释放方法，所述方法由第一远端终端执行，所述方法包括：
所述第一远端终端在第一定时器停止或超时的情况下，释放源侧行链路；
所述源侧行链路是所述第一远端终端和源终端之间的侧行链路，所述第一定时器是在所述第一远端终端发送PC5-RRC连接建立请求的情况下启动的，或，所述第一定时器是所述第一远端终端根据第一消息启动的。
根据本申请的一个方面，提供了一种侧行链路的释放方法，所述方法由服务中继终端执行，所述方法包括：
所述服务中继终端在第二定时器超时，释放所述服务中继终端和第二远端终端之间的侧行链路。
根据本申请的一个方面，提供了一种侧行链路的释放方法，所述方法由第二远端终端执行，所述方法包括：
在所述第二远端终端接收到服务中继终端发送的连接释放请求时，停止第三定时器。
根据本申请的一个方面，提供了一种侧行链路的状态确定方法，所述方法由第一远端终端执行，所述方法包括：
在所述第一远端终端与服务中继终端之间的侧行链路质量低于第九门限值的情况下，确定所述第一远端终端与所述服务中继终端之间发生无线链路失败；
或，
在接收到的第二消息指示所述服务中继终端和第二远端终端之间的侧行链路质量低于第十门限值的情况下，确定所述服务中继终端和所述第二远端终端之间发生无线链路失败。
根据本申请的一个方面，提供了一种侧行链路的选择方法，所述方法由第一远端终端执行，所述方法包括：
在满足添加条件的情况下，将中继终端添加到合适的中继终端集合；
按照选择方式从所述中继终端集合中，选择目标中继终端。
根据本申请的一个方面，提供了一种终端设备，所述终端设备包括：处理器；与所述处理器相连的收发器；用于存储所述处理器的可执行指令的存储器；其中，所述处理器被配置为加载并执行所述可执行指令以实现如上述方面所述侧行链路的切换方法。
根据本申请的一个方面，提供了一种网络设备，所述终端设备包括：处理器；与所述处理器相连的收发器；用于存储所述处理器的可执行指令的存储器；其中，所述处理器被配置为加载并执行所述可执行指令以实现如上述方面所述的感知节侧行链路的切换方法。
根据本申请的一个方面，提供了一种计算机可读存储介质，所述计算机程序产品中存储有可执行指令，所述可执行指令由所述处理器加载并执行以实现如上述方面所述的侧行链路的切换方法。
根据本申请的一个方面，提供了一种计算机程序产品，所述计算机程序产品中存储有可执行指令，所述可执行指令由所述处理器加载并执行以实现如上述方面所述的侧行链路的切换方法。
根据本申请的一个方面，提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片运行时用于实现如上述方面所述的侧行链路的切换方法。
根据本申请的一个方面，提供了一种通信系统，所述侧行通信系统包括至少两个终端设备，或者，终端设备和网络设备，所述终端设备和所述网络设备用于实现如上述方面所述的侧行链路的切换方法。
本申请实施例提供的技术方案带来的有益效果至少包括：
第一远端终端通过向目标终端发送PC5-RRC连接建立请求，从而根据目标终端反馈的PC5-RRC连接建立响应来实现将与源终端之间的源侧行链路切换为与目标终端之间的目标侧行链路，从而实现终端与终端中继的切换过程，提升侧行链路通信场景下终端和终端之间通信的灵活性。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1示出了相关技术中传输模式A的示意图；
图2示出了相关技术中传输模式B的示意图；
图3示出了本申请一个示意性实施例提供的侧行链路的切换方法的流程图；
图4示出了本申请一个示意性实施例提供的侧行链路的测量上报方法的流程图；
图5示出了本申请一个示意性实施例提供的侧行链路的释放方法的流程图；
图6示出了本申请一个示意性实施例提供的第一定时器的应用流程的示意图；
图7示出了本申请一个示意性实施例提供的侧行链路的释放方法的流程图；
图8示出了本申请一个示意性实施例提供的侧行链路的释放方法的流程图；
图9示出了本申请一个示意性实施例提供的侧行链路的状态确定方法的流程图；
图10示出了本申请一个示意性实施例提供的侧行链路的选择方法的流程图；
图11示出了本申请一个示意性实施例提供的PDCP重传方法的流程图；
图12示出了本申请一个示意性实施例提供的侧行链路的切换方法的流程图；
图13示出了本申请一个示意性实施例提供的侧行链路的切换装置的结构框图；
图14示出了本申请一个示意性实施例提供的侧行链路的切换装置的结构框图；
图15示出了本申请一个示意性实施例提供的通信设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本申请相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本申请的一些方面相一致的装置和方法的例子。
在本申请使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也是旨在包括多数形式，除非上下文清楚地表示其它含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
应当理解，尽管在本申请可能采用术语第一、第二、第三等来描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本申请范围的情况下，第一信息也可以被称为第二信息，类似地，第二信息也可以被称为第一信息。取决于语境，例如，在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”。
首先，对本申请实施例涉及的相关技术背景进行介绍：
在长期演进(Long Term Evolution，LTE)下，设备到设备通信是基于设备间通信(Device-to-Device Communication，D2D)的一种侧行链路传输技术，与传统的蜂窝系统中通信数据通过基站接收或者发送的方式不同，车联网系统采用终端到终端直接通信的方式，因此具有更高的频谱效率以及更低的传输时延。在3GPP定义了两种传输模式：模式A和模式B。
如图1所示，其示出了传输模式A，在模式A下，终端101和终端102之间的传输资源是由基站103分配的，终端101和终端102根据基站103分配的资源在侧行链路上进行数据的发送；基站103可以为终端101和终端102分配单次传输的资源，也可以为终端101和终端102分配半静态传输的资源。
如图2所示，其示出了传输模式B，在模式B下，终端201在资源池中选取一个资源进行数据的传输。
在3GPP中，D2D分成了不同的阶段进行研究，包括基于距离的服务(Proximity based Service，ProSe)、车联网(Vehicle to X，V2X)、可穿戴设备(Further Enhancements to LTE Device to Device，FeD2D)、多载波。
ProSe：在Rel-12/13中设备到设备通信，是针对ProSe的场景进行了研究，其主要针对公共安全类的业务。在ProSe中，通过配置资源池在时域上的位置，例如资源池在时域上非连续，达到用户设备(User Equipment，UE)在侧行链路上非连续发送/接收数据，从而达到省电的效果。
V2X：在Rel-14/15中，车联网系统针对车车通信的场景进行了研究，其主要面向相对高速移动的车车、车人通信的业务。在V2X中，由于车载系统具有持续的供电，因此功率效率不是主要问题，而数据传输的时延是主要问题，因此在系统设计上要求终端设备进行连续的发送和接收。
FeD2D：在Rel-14中，这个场景对于可穿戴设备通过手机接入网络的场景进行了研究，其主要面向是低移动速度以及低功率接入的场景。在FeD2D中，在预研阶段3GPP结论为基站可以通过一个relay终端去配置remote终端的DRX参数，但是由于该课题没有进一步进入标准化阶段，如何进行DRX配置的具体细节没有结论。
多载波：在Rel-15 LTE V2X中，引入了多载波机制，具体地，多载波机制体现在UE可以支持数据包分割，用多个载波传输数据包，以提升数据传输率；数据包复制，将一个相同的数据包复制两份，用两个载波发送，以提升传输可靠性；以及接收端的多载波接收增强。具体地，针对数据包复制：V2X侧链通信支持侧链分组复制，并在UE的分组数据聚合协议(Packet Data Convergence Protocol，PDCP)层执行。对于用于传输的侧链路分组复制，PDCP协议数据单元(Protocol Data Unit，PDU)在PDCP实体处被复制。同一PDCP实体的复制数据包协议(Packet Data Protocol，pdp)pdu被提交给两个不同的无线链路控制(Radio Link Control，RLC)实体并分别关联到两个不同的侧链逻辑信道。同一PDCP实体的复制pdppdu只允许在不同的侧链载波上传输。UE可以基于(预)配置来激活或停用侧链分组复制。侧链数据包复制不适用于具有Rel-14传输配置文件(TS 23.285[72])的传输。支持侧链数据包复制的基于距离服务中每数据包可靠性(ProSe Per-Packet Reliability，PPPR)值可以通过PPPR阈值(预)配置。对于UE自主的资源选择和调度的资源分配，UE应对具有配置的PPPR值的数据执行侧链分组复制，直到为这些PPPR值取消分组复制配置为止。对于调度的资源分配，UE通过侧链缓存状态报告(Buffer Status Report，BSR)报告与一个或多个PPPR值相关联的数据量以及数据所属的目的地。PPPR值到逻辑信道组的映射可以由eNB配置，并且PPPR值由包括在侧链BSR中的相关联的逻辑信道组ID反映。一个或多个PPPR值的列表可以由一个无线资源控制(Radio Resource Control，RRC)连接的UE在侧链UE信息中报告。
在新空口(New Radio，NR)下，NR V2X在LTE V2X的基础上，不局限于广播场景，而是进一步拓展到了单播和组播的场景，在这些场景下研究V2X的应用。
类似于LTE V2X，NR V2X也会定义上述mode-1/2两种资源授权模式；更进一步，用户可能处在一个混合的模式下，即既可以使用mode-1进行资源的获取，又同时可以使用mode-2进行资源的获取。该资源获取通过侧行链路授权的方式指示，即侧行链路授权指示相应的物理侧行控制信道(PysicalSidelink Control Channel，PSCCH)与物理侧行共享信道(PysicalSidelink Share Channel，PSSCH)资源的时频位置。
不同于LTE V2X，除了无反馈的、UE自主发起的混合自动重传请求(Hybrid Automatic Repeat-reQuest，HARQ)重传，NR V2X引入了基于反馈的HARQ重传，不限于单播通信，也包括组播通信；
与LTE V2X相同，在NR V2X中，由于车载系统具有持续的供电，因此功率效率不是主要问题，而数据传输的时延是主要问题，因此在系统设计上要求终端设备进行连续的发送和接收。
侧行链路终端会在以下场景中触发侧行链路RRC重配过程：
a.在单播通信中释放侧行链路数据承载；
b.在单播通信中建立侧行链路数据承载；
c.在单播通信中修改侧行链路数据承载的相关配置；
d.在终端到网络中继场景中，释放层二中继终端与远端终端之间的PC5中继无线链路控制(Radio Link Control，RLC)信道；
e.在终端到网络中继场景中，建立层二中继终端与远端终端之间的PC5中继RLC信道；
f.在终端到网络中继场景中，修改层二中继终端与远端终端之间的PC5中继RLC信道相关的配置参数；
g.NR侧行链路测量上报相关参数的重配置；
h.侧行链路信道状态信息(Channel State Information，CSI)参考信号资源与CSI上报延迟边界的重配；
i.对于对端终端侧行链路非连续接收(Discontinuous Reception，DRX)的重配。
针对终端到网络中继的场景下，在Rel-17中，讨论了远端终端执行直接链路到中继链路之间的切换过程。远端终端进行测量上报，将中继终端标识，服务小区标识，参考信号接收功率(Reference Signal Received Power，RSRP)测量等信息包含在测量上报信息内。在远端终端执行中继链路到直接链路的链路切换时，对于服务中继终端来说，更推荐使用SL-RSRP进行侧行链路上的测量；在远端终端执行直接链路到中继链路的链路切换时，使用SD-RSRP进行侧行链路上的测量。另外，在执行测量上报时，为终端到网络的中继切换定义了两个新的测量上报触发事件。即，事件1当服务中继终端的链路质量低于所配置门限值，且，可选地，相邻小区的链路质量高于所配置门限值时，远端终端执行测量上报；事件2当服务小区链路质量低于所配置门限值时，且，可选地，候选中继终端链路质量高于所配置门限值时，远端终端执行测量上报。另外，为了辅助远端终端执行直接链路到中继链路的切换，引入了一个新的定时器，当远端终端接收到指示直接链路到中继链路切换的RRC重配消息时，远端终端开启定时器。当定时器超时，远端终端执行RRC重建立。
然而，针对终端和终端中继场景下，相关技术中，终端和终端之间如何实现中继切换目前尚没有可行方案。
针对上述问题，本申请实施例提供了一种侧行链路的切换方法，提供了终端和终端中继的解决方案。请参考图3，其示出了本申请一个示例性实施例提供的侧行链路的切换方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，其中，第一远端终端是参与侧行链路通信的终端设备。该方法包括如下步骤：
步骤310，第一远端终端向目标终端发送PC5-RRC连接建立请求。
上述PC5-RRC连接建立请求用于请求建立第一远端终端和目标终端之间的目标侧行链路，以切换第一远端终端和源终端之间的源侧行链路。即，通过PC5-RRC连接建立请求将第一远端终端和源终端之间的源侧行链路切换为和目标终端之间的目标侧行链路。
在一些实施例中，本申请实施例涉及的侧行链路的切换可以实现为以下场景：
可选地，源终端是第二远端终端，目标终端是目标中继终端，源侧行链路是侧行直接链路，目标侧行链路是侧行中继链路。即，当前第一远端终端和第二远端终端之间通过侧行直接链路进行通信，需要将上述侧行直接链路切换为通过目标中继终端实现的侧行中继链路。
可选地，源终端是服务中继终端，目标终端是目标中继终端，源侧行链路和目标侧行链路都是侧行中继链路。即，当前第一远端终端和第二远端终端通过服务中继终端提供的侧行中继链路进行通信，需要将上述与服务中继终端之间的侧行中继链路切换为与目标中继终端之间的侧行中继链路。
可选地，源终端是服务中继终端，目标终端是第二远端终端，源侧行链路是侧行中继链路，目标侧行链路是侧行直接链路。即，当前第一远端终端和第二远端终端通过服务中继终端提供的侧行中继链路进行通信，需要将上述与服务中继终端之间的侧行中继链路切换为与第二远端终端直连的侧行直接链路。
在一些实施例中，PC5-RRC连接建立请求携带以下信息中的至少之一：第二远端终端的标识；服务中继终端的标识；终端到终端中继业务标识；第一远端终端的能力信息；第一远端终端的资源池配置；第一远端终端的非连续接收配置。
在一些实施例中，第一远端终端接收第一消息，上述第一消息用于指示目标终端。即，第一远端终端根据第一消息确定待进行链路切换的目标终端。
可选地，第一消息由如下实体中的至少之一发送：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
可选地，第一消息携带在如下信令中的至少之一：RRC消息；PC5-RRC消息；PC5-S消息。
值得注意的是，在另一些实施例中，第一远端终端也可以通过自身来确定目标终端，即，第一远端终端无需接收第一消息。
在一些实施例中，第一远端终端接收链路质量门限值S的配置。在一个示例中，第一消息中被配置有切换过程中第一远端终端和目标终端之间的链路质量门限值S。
可选地，链路质量门限值S基于如下粒度进行配置：第一远端终端；目标终端；层二目标地址标识。
步骤320，第一远端终端接收目标终端发送的PC5-RRC连接建立响应。
在一些实施例中，PC5-RRC连接建立响应用于指示目标终端接受第一远端终端的PC5-RRC连接建立请求。示意性的，PC5-RRC连接建立响应还包括以下信息中的至少之一：目标终端的能力信息；目标终端的承载配置；目标终端的资源池配置；目标终端的非连续接收配置。
在另一些实施例中，PC5-RRC连接建立响应用于指示目标终端拒绝第一远端终端的PC5-RRC连接建立请求。示意性的，当源终端是服务中继终端，源侧行链路是侧行中继链路时，在第一远端终端已经释放与服务中继终端之间的源侧行链路，则第一远端终端执行中继终端重选；在第一远端终端未释放与服务中继终端之间的源侧行链路，则第一远端终端继续向服务中继终端进行测量上报。
可选地，本实施所涉及的侧行链路测量，可以通过SL-RSRP或SD-RSRP进行测量。
在一些实施例中，第一远端终端的侧行链路的切换执行过程包括：
S10，第一远端终端接收第一消息，第一消息用于指示目标终端；
可选地，第一消息中携带目标终端的终端标识，目标终端包括目标中继终端或第二远端终端。
可选地，第一消息由以下实体中的至少之一发送：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
可选地，第一消息中被配置切换过程中所使用的第一远端终端和目标终端之间的链路质量门限值S。具体的，链路质量门限值S可以按照以下粒度进行配置：每个第一远端终端配置一个S；每个第二远端终端/目标中继终端配置一个S；每个层二目标地址标识配置一个S。
S20，第一远端终端向目标终端发送PC5-RRC连接建立请求；
可选地，PC5-RRC连接建立请求携带以下信息中的至少之一：第二远端终端ID；服务中继终端ID；终端到终端中继业务标识；第一远端终端能力信息；第一远端终端的承载配置；第一远端终端的资源池配置；第一远端终端的非连续接收配置。
S30，第一远端终端接收目标终端发送的PC5-RRC连接建立响应；
可选地，PC5-RRC连接建立响应可以携带以下信息中的至少之一：接受第一远端终端的PC5-RRC连接建立请求；拒绝第一远端终端的PC5-RRC连接建立请求。
若目标终端接受第一远端终端的PC5-RRC连接建立请求，则进一步包含以下信息中的至少之一：目标终端的能力信息；目标终端的承载配置；目标终端的资源池配置；目标终端的非连续接收配置。
S41，若第一远端终端已经释放与服务中继终端之间的连接，则第一远端终端执行中继终端重选；
S42，若第一远端终端未释放与服务中继终端之间的连接，则第一远端终端继续向服务中继终端进行测量上报。
综上所述，本实施例提供的方法，第一远端终端通过向目标终端发送PC5-RRC连接建立请求，从而根据目标终端反馈的PC5-RRC连接建立响应来实现将与源终端之间的源侧行链路切换为与目标终端之间的目标侧行链路，从而实现终端与终端中继的切换过程，提升侧行链路通信场景下终端和终端之间通信的灵活性。
定义终端到终端中继测量上报触发事件：
在一些实施例中，在进行侧行链路的切换之前，第一远端终端会进行中继链路的测量上报，从而保证侧行链路切换过程的切换准确度。示意性的，请参考图4，其示出了本申请一个示例性实施例提供的侧行链路的测量上报方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，该方法包括如下步骤：
步骤410，在目标侧行链路和/或源侧行链路的侧行链路质量满足测量上报触发事件的情况下，发送测量报告。
示意性的，上述目标侧行链路是第一远端终端和目标终端之间的侧行链路，上述源侧行链路是第一远端终端和源终端之间的侧行链路。
在一些实施例中，第一远端终端接收测量上报配置，上述测量上报配置包括测量上报触发事件。
可选地，测量上报配置由如下实体中的任意一个发送：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
可选地，测量上报配置携带在如下信令中的任意一种：RRC消息；PC5-RRC消息；PC5-S消息；SL MAC CE(SidelinkMedia Access Control Control Element，侧行链路媒体接入层控制单元)；DL MAC CE(DownlinkMedia Access Control Control Element，下行链路媒体接入层控制单元)；SCI(Subscriber  Controlled Input，用户输入控制)；DCI(Downlink Control Information，下行控制信息)。
在一些实施例中，上述测量上报触发事件包括：第一事件，第一事件包括第一远端终端和服务中继终端之间的侧行链路质量高于第一门限值。
示意性的，第一事件的准入条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于第一门限值；第一事件的离开条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于第一门限值。
可选地，上述测量上报触发事件还包括：第二事件，第二事件包括服务中继终端与第二远端终端之间的侧行链路质量高于第二门限值。
示意性的，第二事件的准入条件包括：服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于第二门限值；第二事件的离开条件包括：服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于第二门限值。
在另一些实施例中，上述测量上报触发事件包括：第三事件，第三事件包括第一远端终端和服务中继终端之间的侧行链路质量低于第三门限值。
示意性的，第三事件的准入条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于第三门限值；第三事件的离开条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于第三门限值。
可选地，上述测量上报触发事件还包括：第四事件，第四事件包括服务中继终端与第二远端终端之间的侧行链路质量低于第四门限值。
示意性的，第四事件的准入条件包括：服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于第四门限值；第四事件的离开条件包括：服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于第四门限值。
在另一些实施例中，上述测量上报触发事件包括：第五事件，第五事件包括第一远端终端和候选中继终端之间的侧行链路质量高于第五门限值。
示意性的，第五事件的准入条件包括：第一远端终端和候选中继终端之间的侧行链路质量的测量值减去迟滞值大于第五门限值；第五事件的离开条件包括：第一远端终端和候选中继终端之间的侧行链路质量的测量值加上迟滞值小于第五门限值。
可选地，上述测量上报触发事件还包括：第六事件，第六事件包括第一远端终端和服务中继终端之间的侧行链路质量低于第六门限值。
示意性的，第六事件的准入条件包括：第一远端终端和服务中继终端之间的侧行链路质量加上迟滞值小于第六门限值；第六事件的离开条件包括：第一远端终端和服务中继终端之间的侧行链路质量减去迟滞值大于第六门限值。
在另一些实施例中，上述测量上报触发事件包括：第七事件，第七事件包括第一侧行链路质量高于第二侧行链路质量的差值大于或等于第一偏移量；其中，第一侧行链路质量为第一远端终端和候选中继终端之间的侧行链路质量，第二侧行链路质量为第一远端终端和候选中继终端之间的侧行链路质量。
示意性的，第七事件的准入条件包括：第一侧行链路质量的测量值加上第一偏移量减去迟滞值大于第二侧行链路质量的测量值加上第一偏移量和最终偏移量；第七事件的离开条件包括：第一侧行链路质量的测量值加上第一偏移量减去迟滞值小于第二侧行链路质量的测量值加上第一偏移量和最终偏移量；其中，最终偏移量包括为当前测量对象所配置的偏移量。
可选地，上述第一偏移量和最终偏移量根据以下粒度至少之一配置：小区级别的粒度；远端终端级别的粒度；中继终端级别的粒度；业务优先级别的粒度。
在另一些实施例中，上述测量上报触发事件包括：第八事件，第八事件包括第三侧行链路质量高于第二侧行链路质量的差值大于或等于第二偏移量；其中，第三侧行链路质量为第一远端终端和第二远端终端之间的侧行链路质量，第二侧行链路质量为第一远端终端和候选中继终端之间的侧行链路质量。
示意性的，第八事件的准入条件包括：第三侧行链路质量的测量值加上第二偏移量减去迟滞值大于第二侧行链路质量的测量值加上第二偏移量加上最终偏移量；第八事件的离开条件包括：第三侧行链路质量的测量值加上第二偏移量减去迟滞值小于第二侧行链路质量的测量值加上第二偏移量加上最终偏移量；其中，最终偏移量包括为当前测量对象所配置的偏移量。
可选地，第二偏移量和最终偏移量根据以下粒度至少之一配置：小区级别的粒度；远端终端级别的粒度；中继终端级别的粒度；业务优先级别的粒度。
在另一些实施例中，上述测量上报触发事件包括：第九事件，第九事件包括第一远端终端和第二远端终端之间的侧行链路质量高于第七门限值。
示意性的，第九事件的准入条件包括：第一远端终端和第二远端终端之间的侧行链路质量的测量值减 去迟滞值大于第七门限值；第九事件的离开条件包括：第一远端终端和第二远端终端之间的侧行链路质量的测量值加上迟滞值小于第七门限值。
在另一些实施例中，上述测量上报触发事件包括：第十事件，第十事件包括第一远端终端和服务中继终端之间的侧行链路质量低于第八门限值。
示意性的，第十事件的准入条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于第八门限值；第十事件的离开条件包括：第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于第八门限值。
在一些实施例中，服务中继终端与第二远端终端之间的侧行链路质量由如下信令中的至少之一通知给第一远端终端：PC5-RRC消息；PC5-S消息；发现消息；SL-MAC CE；DCI。
可选地，第一远端终端将测量报告发送至如下实体中的至少之一：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
可选地，上述测量报告携带在如下信令中的任意一种：RRC消息；PC5-RRC消息；PC5-S消息；SL MAC CE；UL MAC CE；SCI；UCI(Uplink Control Information，上行控制信息)。
综上所述，本实施例提供的方法，在目标侧行链路和/或源侧行链路的侧行链路质量满足测量上报触发事件的情况下，通过对测量报告进行上报，保证了侧行链路切换过程的切换准确度。
定时器配置：
在一些实施例中，第一远端终端被配置第一定时器，从而控制侧行链路的释放。示意性的，请参考图5，其示出了本申请一个示例性实施例提供的侧行链路的释放方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，该方法包括如下步骤：
步骤510，第一远端终端在第一定时器停止或超时的情况下，释放源侧行链路。
其中，源侧行链路是第一远端终端和源终端之间的侧行链路。第一定时器是在第一远端终端发送PC5-RRC连接建立请求的情况下启动的，或，第一定时器是第一远端终端根据第一消息启动的。
示意性的，第一定时器可以是在以下情况的至少之一启动的：
在第一远端终端发送PC5-RRC连接建立请求的情况下，第一远端终端启动第一定时器；或，第一远端终端通过第一消息启动第一定时器，上述第一消息用于指示目标终端。
可选地，上述第一消息可以是第一远端终端发送的消息，即，当第一远端终端发送第一消息时，开启第一定时器。上述第一消息发送至以下实体中的至少之一：服务中继终端；目标中继终端；第二远端终端。可选地，上述第一消息中可以包括以下信息中的至少之一：第二远端终端ID；服务中继终端ID；终端到终端中继业务标识；第一远端终端的能力信息；第一远端终端的承载配置；第一远端终端的资源池配置；第一远端终端的非连续接收配置。
可选地，上述第一消息也可以是第一远端终端接收到的消息，即，当第一远端终端接收到第一消息时，开启第一定时器。上述第一消息由以下实体中的至少之一发送：服务中继终端；目标中继终端；第二远端终端。可选地，上述第一消息包含可切换的目标中继终端标识。
可选地，在第一远端终端接收到PC5-RRC连接建立响应，且PC5-RRC连接建立响应用于指示接受的情况下，停止第一定时器；或者，在第一远端终端发送指定消息时，停止第一定时器。可选地，上述指定消息发送至以下实体中的至少之一：服务中继终端；目标中继终端；第二远端终端。可选地，上述指定消息中可以包括以下信息中的至少之一：服务中继终端和/或目标中继终端的能力信息；服务中继终端和/或目标中继终端的承载配置；服务中继终端和/或目标中继终端的资源池配置；服务中继终端和/或目标中继终端的非连续接收配置。
在一些实施例中，第一远端终端接收第一定时器的配置。
可选地，第一定时器的配置由如下实体中的至少之一发送：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
在一些实施例中，第一远端终端对切换失败的情况进行上报。可选地，第一远端终端在第一定时器超时的情况下，发送切换失败；或，第一远端终端接收到PC5-RRC连接建立响应，且PC5-RRC连接建立响应用于指示拒绝的情况下，发送切换失败；或，第一远端终端发送目标终端的链路测量值低于链路质量门限值S的情况下，发送切换失败。
可选地，第一远端终端向以下实体至少之一上报切换失败：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。
在一些实施例中，第一远端终端接收链路质量门限值S的配置。可选地，链路质量门限值S基于如下粒度进行配置：第一远端终端；目标终端；层二目标地址标识。
在释放源侧行链路的过程中，可选地，第一远端终端向源终端发送连接释放请求，上述连接释放请求 用于触发服务中继终端释放与第二远端终端之间的连接。可选地，上述连接释放请求采用如下信令中的至少之一进行指示：PC5-RRC；PC5-S；SLMACCE；SCI。
在一个示例中，如图6所示，其示出了本申请一个示例性实施例提供的第一定时器的应用流程的示意图，以源侧行链路和目标侧行链路均为侧行中继链路为例，该系统包括第一远端终端601、服务中继终端602、第二远端终端603和目标中继终端604，该流程包括如下步骤：S610，服务中继终端602向第一远端终端601发送测量上报配置；S620，第一远端终端601向服务中继终端602发送测量报告；S630，服务中继终端602向第一远端终端601发送第一消息，第一消息用于指示目标中继终端；S641，第一远端终端601开启第一定时器；S642，第一远端终端601向目标中继终端604发送PC5-RRC连接建立请求；S650，目标中继终端604向第一远端终端601发送PC5-RRC连接建立响应，该PC5-RRC连接建立响应指示接受第一远端终端601的PC5-RRC连接建立请求；S660，第一远端终端601停止第一定时器。
在一些实施例中，服务中继终端被配置第二定时器，从而控制侧行链路的释放，示意性的，请参考图7，其示出了本申请一个示例性实施例提供的侧行链路的释放方法的流程图，本实施例以该方法由服务中继终端执行为例进行说明，该方法包括如下步骤：
步骤710，服务中继终端在第二定时器超时，释放服务中继终端和第二远端终端之间的侧行链路。
在一些实施例中，服务中继终端接收第二定时器的配置。
可选地，第二定时器的配置由如下实体中的至少之一发送：服务中继终端所连接的网络设备；服务中继终端所连接的第一远端终端；服务中继终端所连接的第二远端终端。
在一些实施例中，在服务中继终端发送第一消息时，启动第二定时器。
在一些实施例中，在服务中继终端接收到第一远端终端发送的连接释放请求时，停止第二定时器。
在一些实施例中，第二远端终端被配置第三定时器，从而控制侧行链路的释放，示意性的，请参考图8，其示出了本申请一个示例性实施例提供的侧行链路的释放方法的流程图，本实施例以该方法由第二远端终端执行为例进行说明，该方法包括如下步骤：
步骤810，在第二远端终端接收到服务中继终端发送的连接释放请求时，停止第三定时器。
可选地，连接释放请求携带在如下信令中的任意一种：PC5-RRC；PC5-S；SL MAC CE；SCI。
在一些实施例中，在第二远端终端向第一远端终端发送第一消息时，开启第三定时器。示意性的，上述第一消息中包含可切换的目标中继终端标识。
可选地，第三定时器的配置由如下实体中的至少之一发送：第二远端终端所连接的网络设备；第二远端终端所连接的第一远端设备；第二远端终端所连接的服务中继终端。
综上所述，本实施例提供的方法，通过在第一远端终端和/或服务中继终端和/或第二远端终端中设置定时器，从而控制侧行链路的释放，提升了侧行链路的切换过程的切换效率。
无线链路失败：
请参考图9，其示出了本申请一个示例性实施例提供的侧行链路的状态确定方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，该方法包括如下步骤：
步骤910，在第三侧行链路质量和/或第四侧行链路质量满足指定条件下，确定服务中继终端不适合被继续选择。
示意性的，第三侧行链路质量为第一远端终端与服务中继终端之间的侧行链路质量，第四侧行链路质量是服务中继终端和第二远端终端之间的侧行链路质量。
可选地，在第一远端终端与服务中继终端之间的侧行链路质量低于第九门限值的情况下，确定第一远端终端与服务中继终端之间发生无线链路失败。即，第三侧行链路质量低于第九门限的情况下，第一远端终端可认为服务中继终端不适合被继续选择。
可选地，上述第九门限值可以由以下实体至少之一进行配置：第一远端终端所所连接的第二远端终端；第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端。
可选地，在接收到的第二消息指示服务中继终端和第二远端终端之间的侧行链路质量低于第十门限值的情况下，确定服务中继终端和第二远端终端之间发生无线链路失败。即，第四侧行链路质量低于第十门限值的情况下，第一远端终端可认为服务中继终端不适合被继续选择。
可选地，上述第二消息可以是服务中继终端和/或第二远端终端指示给第一远端终端的。可选地，第二消息采用如下信令中的至少之一进行指示：PC5-RRC消息；PC5-S消息；SL MAC CE消息；SCI。
可选地，上述第十门限值可以由以下实体至少之一进行配置：第二远端终端所连接的第一远端终端；第二远端终端所连接的网络设备；第二远端终端所连接的服务中继终端。
可选地，第九门限值和第十门限值按照以下粒度中的至少之一进行配置：QoS flow；层二目标地址；SL-RB(Sidelink-Resource Block，侧行链路资源块)。
综上所述，本实施例提供的方法，通过第一远端终端与服务中继终端之间的侧行链路质量，和/或，服务中继终端和第二远端终端之间的侧行链路质量确定服务中继终端是否适合继续作为中继终端，从而保证第一远端终端在合适的情况下进行侧行链路的切换。
中继终端选择/重选：
请参考图10，其示出了本申请一个示例性实施例提供的侧行链路的选择方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，该方法包括如下步骤：
步骤1010，在满足添加条件的情况下，将中继终端添加到合适的中继终端集合。
可选地，添加条件包括：第一远端终端与中继终端之间的侧行链路质量高于第十一门限值。
可选地，添加条件还包括：第一远端终端和所述第二远端终端之间的侧行链路质量低于第十二门限值。
步骤1020，按照选择方式从中继终端集合中，选择服务中继终端或目标中继终端。
可选地，选择方式可以实现为以下至少一种：选择方式由第一远端终端实现；或，选择方式为选择侧行链路质量最高的中继终端；或，选择方式为由第二远端终端向第一远端终端进行指示。
当选择方式为由第二远端终端向第一远端终端进行指示时，第二远端终端采用如下信令中的至少之一进行指示：发现消息；SL MAC CE；SCI。
综上所述，本实施例提供的方法，通过添加条件来确定合适的中继终端，通过选择方式确定出参与侧行链路建立的服务中继终端或目标中继终端，从而保证了建立的侧行链路的可靠性。
PDCP(Packet Data Convergence Protocol，分组数据聚合协议)重传(Retransmission)：
请参考图11，其示出了本申请一个示例性实施例提供的PDCP重传方法的流程图，本实施例以该方法由第一远端终端执行为例进行说明，该方法包括如下步骤：
步骤1110，第一远端终端通过指定方式获取更新的PDCP密钥。
可选地，上述指定方式包括以下方式中的至少一种：第一远端终端通过第一远端终端的上层获取更新的PDCP；或，第一远端终端通过第一远端终端自身获取更新的PDCP密钥；或，第一远端终端通过第三消息获得更新的PDCP密钥，第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中由第二远端终端发送的，或者，第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中向第二远端终端发送的。
可选地，第三消息是目标中继终端向第二远端终端发送切换完成指示后触发第二远端终端发送的；或者，第三消息是目标中继终端向第二远端终端发送切换完成指示的同时第一远端终端通过目标中继终端向第二远端终端发送的。
步骤1120，第一远端终端进行PDCP操作。
可选地，第一远端终端通过第一远端终端的上层触发，进行PDCP操作；或，第一远端终端通过第四消息触发，进行PDCP操作。
可选地，上述PDCP操作包括如下至少之一：PDCP重建；PDCP数据恢复；丢弃存储的PDCP PDUs(Protocol Data Unit，协议数据单元)/SDUs(ServiceData Unit，服务数据单元)。
可选地，第四消息是第一远端终端发送给第二远端终端的；或者，第四消息是第二远端终端发送给第一远端终端的。可选地，第四消息采用如下信令中的至少之一进行指示：PC5-RRC；PC5-S。
综上所述，本实施例提供的方法，通过更新PDCP密钥来保证单播连接过程中PDCP操作的安全性。
值得注意的是，上述多个实施例可以通过任意组合从而得到新的实施例。
示意性的，请参考图12，其示出了本申请一个示例性实施例提供的侧行链路的切换方法的流程图，本实施例以该方法由目标终端执行为例进行说明。该方法包括如下步骤：
步骤1210，目标终端接收第一远端终端发送的PC5-RRC连接建立请求。
上述PC5-RRC连接建立请求用于请求建立第一远端终端和目标终端之间的目标侧行链路，以切换第一远端终端和源终端之间的源侧行链路。
在一些实施例中，本申请实施例涉及的侧行链路的切换可以实现为以下场景：
可选地，源终端是第二远端终端，目标终端是目标中继终端，源侧行链路是侧行直接链路，目标侧行链路是侧行中继链路。即，当前第一远端终端和第二远端终端之间通过侧行直接链路进行通信，需要将上述侧行直接链路切换为通过目标中继终端实现的侧行中继链路。
可选地，源终端是服务中继终端，目标终端是目标中继终端，源侧行链路和目标侧行链路都是侧行中继链路。即，当前第一远端终端和第二远端终端通过服务中继终端提供的侧行中继链路进行通信，需要将上述与服务中继终端之间的侧行中继链路切换为与目标中继终端之间的侧行中继链路。
可选地，源终端是服务中继终端，目标终端是第二远端终端，源侧行链路是侧行中继链路，目标侧行链路是侧行直接链路。即，当前第一远端终端和第二远端终端通过服务中继终端提供的侧行中继链路进行通信，需要将上述与服务中继终端之间的侧行中继链路切换为与第二远端终端直连的侧行直接链路。
在一些实施例中，PC5-RRC连接建立请求携带以下信息中的至少之一：第二远端终端的标识；服务中继终端的标识；终端到终端中继业务标识；第一远端终端的能力信息；第一远端终端的资源池配置；第一远端终端的非连续接收配置。
在一些实施例中，第一远端终端根据第一消息确定待进行链路切换的目标终端。可选地，第一消息由如下实体中的至少之一发送：第一远端终端所连接的网络设备；第一远端终端所连接的服务中继终端；第一远端终端所连接的第二远端终端。可选地，第一消息携带在如下信令中的至少之一：RRC消息；PC5-RRC消息；PC5-S消息。
值得注意的是，在另一些实施例中，第一远端终端也可以通过自身来确定目标终端，即，第一远端终端无需接收第一消息。
步骤1220，目标终端向第一远端终端发送PC5-RRC连接建立响应。
在一些实施例中，PC5-RRC连接建立响应用于指示目标终端接受第一远端终端的PC5-RRC连接建立请求。示意性的，PC5-RRC连接建立响应还包括以下信息中的至少之一：目标终端的能力信息；目标终端的承载配置；目标终端的资源池配置；目标终端的非连续接收配置。
在另一些实施例中，PC5-RRC连接建立响应用于指示目标终端拒绝第一远端终端的PC5-RRC连接建立请求。
图13示出了本申请一个示意性实施例提供的一种侧行链路的切换装置的结构框图，该装置包括如下模块中的至少部分模块：
第一发送模块1310，用于所述第一远端终端向目标终端发送PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
第一接收模块1320，用于所述第一远端终端接收所述目标终端发送的PC5-RRC连接建立响应。
在一些实施例中，所述源终端是第二远端终端，所述目标终端是目标中继终端，所述源侧行链路是侧行直接链路，所述目标侧行链路是侧行中继链路；或，所述源终端是服务中继终端，所述目标终端是目标中继终端，所述源侧行链路和所述目标侧行链路都是侧行中继链路；或，所述源终端是服务中继终端，所述目标终端是第二远端终端，所述源侧行链路是侧行中继链路，所述目标侧行链路是侧行直接链路。
在一些实施例中，所述PC5-RRC连接建立请求携带以下信息中的至少之一：所述第二远端终端的标识；所述服务中继终端的标识；终端到终端中继业务标识；所述第一远端终端的能力信息；所述第一远端终端的承载配置；所述第一远端终端的资源池配置；所述第一远端终端的非连续接收配置。
在一些实施例中，所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的所述PC5-RRC连接建立请求；或，所述PC5-RRC连接建立响应用于指示所述目标终端拒绝所述第一远端终端的所述PC5-RRC连接建立请求。
在一些实施例中，所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的PC5-RRC连接建立请求，所述PC5-RRC连接建立响应还包括以下信息中的至少之一：所述目标终端的能力信息；所述目标终端的承载配置；所述目标终端的资源池配置；所述目标终端的非连续接收配置。
在一些实施例中，所述PC5-RRC连接建立响应用于指示所述目标终端拒绝所述第一远端终端的PC5-RRC连接建立请求；所述源终端是所述服务中继终端，所述源侧行链路是侧行中继链路；
该装置还包括：
重选模块1330，用于在所述第一远端终端已经释放与所述服务中继终端之间的所述源侧行链路，则所述第一远端终端执行中继终端重选；
所述第一发送模块1310，还用于在所述第一远端终端未释放与所述服务中继终端之间的所述源侧行链路，则所述第一远端终端继续向所述服务中继终端进行测量上报。
在一些实施例中，所述第一接收模块1320，还用于所述第一远端终端接收第一消息，所述第一消息用于指示所述目标终端。
在一些实施例中，所述第一消息由如下实体中的至少之一发送：所述第一远端终端所连接的网络设备；所述第一远端终端所连接的服务中继终端；所述第一远端终端所连接的第二远端终端。
在一些实施例中，所述第一消息携带在如下信令中的至少之一：RRC消息；PC5-RRC消息；PC5-S消息。
在一些实施例中，所述装置还包括：
释放模块1340，用于所述第一远端终端在第一定时器停止或超时的情况下，释放所述源侧行链路。
在一些实施例中，所述第一接收模块1320，还用于所述第一远端终端接收所述第一定时器的配置。
在一些实施例中，所述第一定时器的配置由如下实体中的至少之一发送：所述第一远端终端所连接的网络设备；所述第一远端终端所连接的服务中继终端；所述第一远端终端所连接的第二远端终端。
在一些实施例中，所述装置还包括，控制模块1350；
所述控制模块1350，包括：
启动单元1351，用于在所述第一远端终端发送所述PC5-RRC连接建立请求的情况下，启动所述第一定时器；或，所述第一远端终端通过第一消息启动所述第一定时器；所述第一消息用于指示所述目标终端。
在一些实施例中，所述控制模块1350，还包括：
停止单元1352，用于在所述第一远端终端接收到所述PC5-RRC连接建立响应，且所述PC5-RRC连接建立响应用于指示接受的情况下，停止所述第一定时器。
在一些实施例中，所述第一发送模块1310，还用于所述第一远端终端在第一定时器超时的情况下，发送切换失败；或，所述第一远端终端接收到所述PC5-RRC连接建立响应，且所述PC5-RRC连接建立响应用于指示拒绝的情况下，发送切换失败；或，所述第一远端终端发送所述目标终端的链路测量值低于链路质量门限值S的情况下，发送切换失败。
在一些实施例中，所述第一接收模块1320，还用于接收所述链路质量门限值S的配置。
在一些实施例中，所述链路质量门限值S基于如下粒度进行配置：所述第一远端终端；所述目标终端；层二目标地址标识。
在一些实施例中，所述第一发送模块1310，还用于在满足测量上报触发事件的情况下，发送测量报告。
在一些实施例中，所述第一接收模块1320，还用于接收测量上报配置，所述测量上报配置包括所述测量上报触发事件。
在一些实施例中，所述测量上报配置由如下实体中的任意一个发送：所述第一远端终端所连接的网络设备；所述第一远端终端所连接的服务中继终端；所述第一远端终端所连接的第二远端终端。
在一些实施例中，所述测量上报配置携带在如下信令中的任意一种：RRC消息；PC5-RRC消息；PC5-S消息；SL MAC CE；DL MAC CE；SCI；DCI。
在一些实施例中，所述测量上报触发事件，包括：第一事件，所述第一事件包括所述第一远端终端和服务中继终端之间的侧行链路质量高于第一门限值。
在一些实施例中，所述第一事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第一门限值；所述第一事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第一门限值。
在一些实施例中，所述测量上报触发事件还包括：第二事件，所述第二事件包括所述服务中继终端与第二远端终端之间的侧行链路质量高于第二门限值。
在一些实施例中，所述第二事件的准入条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第二门限值；所述第二事件的离开条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第二门限值。
在一些实施例中，所述测量上报触发事件，包括：第三事件，所述第三事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第三门限值。
在一些实施例中，所述第三事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第三门限值；所述第三事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第三门限值。
在一些实施例中，所述测量上报触发事件还包括：第四事件，所述第四事件包括所述服务中继终端与第二远端终端之间的侧行链路质量低于第四门限值。
在一些实施例中，所述第四事件的准入条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第四门限值；所述第四事件的离开条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第四门限值。
在一些实施例中，所述测量上报触发事件，包括：第五事件，所述第五事件包括所述第一远端终端和候选中继终端之间的侧行链路质量高于第五门限值。
在一些实施例中，所述第五事件的准入条件包括：所述第一远端终端和候选中继终端之间的侧行链路 质量的测量值减去迟滞值大于所述第五门限值；所述第五事件的离开条件包括：所述第一远端终端和候选中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第五门限值。
在一些实施例中，所述测量上报触发事件还包括：第六事件，所述第六事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第六门限值。
在一些实施例中，所述第六事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量加上迟滞值小于所述第六门限值；所述第六事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量减去迟滞值大于所述第六门限值。
在一些实施例中，所述测量上报触发事件，包括：第七事件，所述第七事件包括第一侧行链路质量高于第二侧行链路质量的差值大于或等于第一偏移量；其中，所述第一侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量，所述第二侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量。
在一些实施例中，所述第七事件的准入条件包括：所述第一侧行链路质量的测量值加上所述第一偏移量减去迟滞值大于所述第二侧行链路质量的测量值加上所述第一偏移量和最终偏移量；所述第七事件的离开条件包括：所述第一侧行链路质量的测量值加上所述第一偏移量减去迟滞值小于所述第二侧行链路质量的测量值加上所述第一偏移量和最终偏移量；其中，所述最终偏移量包括为当前测量对象所配置的偏移量。
在一些实施例中，所述第一偏移量和所述最终偏移量根据以下粒度至少之一配置：小区级别的粒度；远端终端级别的粒度；中继终端级别的粒度；业务优先级别的粒度。
在一些实施例中，，所述测量上报触发事件，包括：第八事件，所述第八事件包括第三侧行链路质量高于第二侧行链路质量的差值大于或等于第二偏移量；其中，所述第三侧行链路质量为所述第一远端终端和第二远端终端之间的侧行链路质量，所述第二侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量。
在一些实施例中，所述第八事件的准入条件包括：所述第三侧行链路质量的测量值加上所述第二偏移量减去迟滞值大于所述第二侧行链路质量的测量值加上所述第二偏移量加上最终偏移量；所述第八事件的离开条件包括：所述第三侧行链路质量的测量值加上所述第二偏移量减去迟滞值小于所述第二侧行链路质量的测量值加上所述第二偏移量加上最终偏移量；其中，所述最终偏移量包括为当前测量对象所配置的偏移量。
在一些实施例中，所述第二偏移量和所述最终偏移量根据以下粒度至少之一配置：小区级别的粒度；远端终端级别的粒度；中继终端级别的粒度；业务优先级别的粒度。
在一些实施例中，所述测量上报触发事件，包括：第九事件，所述第九事件包括所述第一远端终端和第二远端终端之间的侧行链路质量高于第七门限值。
在一些实施例中，所述第九事件的准入条件包括：所述第一远端终端和第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第七门限值；所述第九事件的离开条件包括：所述第一远端终端和第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第七门限值。
在一些实施例中，所述测量上报触发事件还包括：第十事件，所述第十事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第八门限值。
在一些实施例中，所述第十事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第八门限值；所述第十事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第八门限值。
在一些实施例中，所述服务中继终端与所述第二远端终端之间的侧行链路质量由如下信令中的至少之一通知给所述第一远端终端：PC5-RRC消息；PC5-S消息；发现消息；SL-MAC CE；DCI。
在一些实施例中，所述测量报告发送至如下实体中的至少之一：所述第一远端终端所连接的网络设备；所述第一远端终端所连接的服务中继终端；所述第一远端终端所连接的第二远端终端。
在一些实施例中，所述测量报告携带在如下信令中的任意一种：RRC消息；PC5-RRC消息；PC5-S消息；SL MAC CE；UL MAC CE；SCI；UCI。
在一些实施例中，所述装置还包括：
确定模块1360，用于在所述第一远端终端与服务中继终端之间的侧行链路质量低于第九门限值的情况下，确定所述第一远端终端与所述服务中继终端之间发生无线链路失败；或，在接收到的第二消息指示所述服务中继终端和第二远端终端之间的侧行链路质量低于第十门限值的情况下，确定所述服务中继终端和所述第二远端终端之间发生无线链路失败。
在一些实施例中，所述第九门限值和所述第十门限值按照以下粒度中的至少之一进行配置：QoS flow；层二目标地址；SL-RB。
在一些实施例中，所述确定模块1360，还包括：
添加单元1361，用于在满足添加条件的情况下，将中继终端添加到合适的中继终端集合；
选择单元1362，用于按照选择方式从所述中继终端集合中，选择服务目标中继终端。
在一些实施例中，所述添加条件包括：所述第一远端终端与所述中继终端之间的侧行链路质量高于第十一门限值。
在一些实施例中，所述添加条件还包括：所述第一远端终端和所述第二远端终端之间的侧行链路质量低于第十二门限值。
在一些实施例中，所述选择方式由所述第一远端终端实现；或，所述选择方式为选择侧行链路质量最高的中继终端；或，所述选择方式为由第二远端终端向第一远端终端进行指示。
在一些实施例中，所述第二远端终端采用如下信令中的至少之一进行指示：发现消息；SL MAC CE；SCI。
在一些实施例中，所述第一接收模块1320，还用于所述第一远端终端通过所述第一远端终端的上层获取更新的PDCP；或，所述第一远端终端通过所述第一远端终端自身获取更新的PDCP密钥；或，所述第一远端终端通过第三消息获得所述更新的PDCP密钥，所述第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中由第二远端终端发送的，或者，所述第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中向第二远端终端发送的。
在一些实施例中，所述第三消息是所述目标中继终端向所述第二远端终端发送切换完成指示后触发所述第二远端终端发送的；或者，所述第三消息是所述目标中继终端向所述第二远端终端发送切换完成指示的同时所述第一远端终端通过所述目标中继终端向所述第二远端终端发送的。
在一些实施例中，所述装置还包括：
处理模块1370，用于所述第一远端终端通过所述第一远端终端的上层触发，进行PDCP操作；或，所述第一远端终端通过第四消息触发，进行PDCP操作。
在一些实施例中，所述PDCP操作包括如下至少之一：PDCP重建；PDCP数据恢复；丢弃存储的PDCP PDUs/SDUs。
在一些实施例中，所述第四消息是所述第一远端终端发送给所述第二远端终端的；或者，所述第四消息是所述第二远端终端发送给所述第一远端终端的。
图14示出了本申请一个示意性实施例提供的一种侧行链路的切换装置的结构框图，该装置包括如下模块中的至少部分模块：
第二接收模块1410，用于所述目标终端接收第一远端终端发送的PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
第二发送模块1420，用于所述目标终端向所述第一远端终端发送PC5-RRC连接建立响应。
在一些实施例中，所述源终端是第二远端终端，所述目标终端是目标中继终端，所述源侧行链路是侧行直接链路，所述目标侧行链路是侧行中继链路；或，所述源终端是服务中继终端，所述目标终端是目标中继终端，所述源侧行链路和所述目标侧行链路都是侧行中继链路；或，所述源终端是服务中继终端，所述目标终端是第二远端终端，所述源侧行链路是侧行中继链路，所述目标侧行链路是侧行直接链路。
在一些实施例中，所述PC5-RRC连接建立请求携带以下信息中的至少之一：所述第二远端终端的标识；所述服务中继终端的标识；终端到终端中继业务标识；所述第一远端终端的能力信息；所述第一远端终端的承载配置；所述第一远端终端的资源池配置；所述第一远端终端的非连续接收配置。
在一些实施例中，所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的所述PC5-RRC连接建立请求；或，所述PC5-RRC连接建立响应用于指示所述目标终端拒绝所述第一远端终端的所述PC5-RRC连接建立请求。
在一些实施例中，所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的PC5-RRC连接建立请求，所述PC5-RRC连接建立响应还包括以下信息中的至少之一：所述目标终端的能力信息；所述目标终端的承载配置；所述目标终端的资源池配置；所述目标终端的非连续接收配置。
图15示出了本申请一个示例性实施例提供的通信设备(终端设备或网络设备)的结构示意图，该通信设备1500包括：处理器1501、接收器1502、发射器1503、存储器1504和总线1505。
处理器1501包括一个或者一个以上处理核心，处理器1501通过运行软件程序以及模块，从而执行各种功能应用以及信息处理。
接收器1502和发射器1503可以实现为一个通信组件，该通信组件可以是一块通信芯片。
存储器1504通过总线1505与处理器1501相连。存储器1504可用于存储至少一个指令，处理器1501 用于执行该至少一个指令，以实现上述方法实施例中的各个步骤。
此外，存储器1504可以由任何类型的易失性或非易失性存储设备或者它们的组合实现，易失性或非易失性存储设备包括但不限于：磁盘或光盘，电可擦除可编程只读存储器(Electrically Erasable Programmable Read Only Memory，EEPROM)，可擦除可编程只读存储器(Erasable Programmable Read-Only Memory，EPROM)，静态随时存取存储器(Static Random-Access Memory，SRAM)，只读存储器(Read-Only Memory，ROM)，磁存储器，快闪存储器，可编程只读存储器(Programmable Read-Only Memory，PROM)。
在示例性实施例中，还提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有至少一段程序，所述至少一段程序由所述处理器加载并执行以实现上述各个方法实施例提供的侧行链路的切换方法。
在示例性实施例中，还提供了一种芯片，所述芯片包括可编程逻辑电路和/或程序指令，当所述芯片在通信设备上运行时，用于实现上述各个方法实施例提供的侧行链路的切换方法。
在示例性实施例中，还提供了一种计算机程序产品，该计算机程序产品在计算机设备的处理器上运行时，使得计算机设备执行上述侧行链路的切换方法。
在示例性实施例中，还提供了一种通信系统，该通信系统包括上述至少两个终端设备，或者，终端设备和网络设备，用于实现上述各个方法实施例提供的侧行链路的切换方法。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (79)

  1. 一种侧行链路的切换方法，其特征在于，所述方法由第一远端终端执行，所述方法包括：
    所述第一远端终端向目标终端发送PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
    所述第一远端终端接收所述目标终端发送的PC5-RRC连接建立响应。
  2. 根据权利要求1所述的方法，其特征在于，
    所述源终端是第二远端终端，所述目标终端是目标中继终端，所述源侧行链路是侧行直接链路，所述目标侧行链路是侧行中继链路；
    或，
    所述源终端是服务中继终端，所述目标终端是目标中继终端，所述源侧行链路和所述目标侧行链路都是侧行中继链路；
    或，
    所述源终端是服务中继终端，所述目标终端是第二远端终端，所述源侧行链路是侧行中继链路，所述目标侧行链路是侧行直接链路。
  3. 根据权利要求2所述的方法，其特征在于，所述PC5-RRC连接建立请求携带以下信息中的至少之一：
    所述第二远端终端的标识；
    所述服务中继终端的标识；
    终端到终端中继业务标识；
    所述第一远端终端的能力信息；
    所述第一远端终端的承载配置；
    所述第一远端终端的资源池配置；
    所述第一远端终端的非连续接收配置。
  4. 根据权利要求2所述的方法，其特征在于，
    所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的所述PC5-RRC连接建立请求；
    或，
    所述PC5-RRC连接建立响应用于指示所述目标终端拒绝所述第一远端终端的所述PC5-RRC连接建立请求。
  5. 根据权利要求4所述的方法，其特征在于，所述PC5-RRC连接建立响应用于指示所述目标终端接受所述第一远端终端的PC5-RRC连接建立请求，所述PC5-RRC连接建立响应还包括以下信息中的至少之一：
    所述目标终端的能力信息；
    所述目标终端的承载配置；
    所述目标终端的资源池配置；
    所述目标终端的非连续接收配置。
  6. 根据权利要求4所述的方法，其特征在于，所述PC5-RRC连接建立响应用于指示所述目标终端拒绝所述第一远端终端的PC5-RRC连接建立请求；所述源终端是所述服务中继终端，所述源侧行链路是侧行中继链路；
    所述方法还包括：
    在所述第一远端终端已经释放与所述服务中继终端之间的所述源侧行链路，则所述第一远端终端执行中继终端重选；
    在所述第一远端终端未释放与所述服务中继终端之间的所述源侧行链路，则所述第一远端终端继续向所述服务中继终端进行测量上报。
  7. 根据权利要求1至6任一所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端接收第一消息，所述第一消息用于指示所述目标终端。
  8. 根据权利要求7所述的方法，其特征在于，所述第一消息由如下实体中的至少之一发送：
    所述第一远端终端所连接的网络设备；
    所述第一远端终端所连接的服务中继终端；
    所述第一远端终端所连接的第二远端终端。
  9. 根据权利要求7所述的方法，其特征在于，所述第一消息携带在如下信令中的至少之一：
    RRC消息；
    PC5-RRC消息；
    PC5-S消息。
  10. 根据权利要求1至6任一所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端在第一定时器停止或超时的情况下，释放所述源侧行链路。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端接收所述第一定时器的配置。
  12. 根据权利要求11所述的方法，其特征在于，所述第一定时器的配置由如下实体中的至少之一发送：
    所述第一远端终端所连接的网络设备；
    所述第一远端终端所连接的服务中继终端；
    所述第一远端终端所连接的第二远端终端。
  13. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    在所述第一远端终端发送所述PC5-RRC连接建立请求的情况下，启动所述第一定时器；
    或，
    所述第一远端终端通过第一消息启动所述第一定时器；所述第一消息用于指示所述目标终端。
  14. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    在所述第一远端终端接收到所述PC5-RRC连接建立响应，且所述PC5-RRC连接建立响应用于指示接受的情况下，停止所述第一定时器。
  15. 根据权利要求1至6任一所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端在第一定时器超时的情况下，发送切换失败；
    或，
    所述第一远端终端接收到所述PC5-RRC连接建立响应，且所述PC5-RRC连接建立响应用于指示拒绝的情况下，发送切换失败；
    或，
    所述第一远端终端发送所述目标终端的链路测量值低于链路质量门限值S的情况下，发送切换失败。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    接收所述链路质量门限值S的配置。
  17. 根据权利要求16所述的方法，其特征在于，所述链路质量门限值S基于如下粒度进行配置：
    所述第一远端终端；
    所述目标终端；
    层二目标地址标识。
  18. 根据权利要求1至17任一所述的方法，其特征在于，所述方法还包括：
    在满足测量上报触发事件的情况下，发送测量报告。
  19. 根据权利要18所述的方法，其特征在于，所述方法还包括：
    接收测量上报配置，所述测量上报配置包括所述测量上报触发事件。
  20. 根据权利要求19所述的方法，其特征在于，所述测量上报配置由如下实体中的任意一个发送：
    所述第一远端终端所连接的网络设备；
    所述第一远端终端所连接的服务中继终端；
    所述第一远端终端所连接的第二远端终端。
  21. 根据权利要求19所述的方法，其特征在于，所述测量上报配置携带在如下信令中的任意一种：
    RRC消息；
    PC5-RRC消息；
    PC5-S消息；
    SL MAC CE；
    DL MAC CE；
    SCI；
    DCI。
  22. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第一事件，所述第一事件包括所述第一远端终端和服务中继终端之间的侧行链路质量高于第一门限值。
  23. 根据权利要求22所述的方法，其特征在于，
    所述第一事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第一门限值；
    所述第一事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第一门限值。
  24. 根据权利要求22所述的方法，其特征在于，所述测量上报触发事件还包括：
    第二事件，所述第二事件包括所述服务中继终端与第二远端终端之间的侧行链路质量高于第二门限值。
  25. 根据权利要求24所述的方法，其特征在于，
    所述第二事件的准入条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第二门限值；
    所述第二事件的离开条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第二门限值。
  26. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第三事件，所述第三事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第三门限值。
  27. 根据权利要求26所述的方法，其特征在于，
    所述第三事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第三门限值；
    所述第三事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第三门限值。
  28. 根据权利要求26所述的方法，其特征在于，所述测量上报触发事件还包括：
    第四事件，所述第四事件包括所述服务中继终端与第二远端终端之间的侧行链路质量低于第四门限值。
  29. 根据权利要求28所述的方法，其特征在于，
    所述第四事件的准入条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第四门限值；
    所述第四事件的离开条件包括：所述服务中继终端与第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第四门限值。
  30. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第五事件，所述第五事件包括所述第一远端终端和候选中继终端之间的侧行链路质量高于第五门限值。
  31. 根据权利要求30所述的方法，其特征在于，
    所述第五事件的准入条件包括：所述第一远端终端和候选中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第五门限值；
    所述第五事件的离开条件包括：所述第一远端终端和候选中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第五门限值。
  32. 根据权利要求30所述的方法，其特征在于，所述测量上报触发事件还包括：
    第六事件，所述第六事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第六门限值。
  33. 根据权利要求32所述的方法，其特征在于，
    所述第六事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量加上迟滞值小于所述第六门限值；
    所述第六事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量减去迟滞值大于所述第六门限值。
  34. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第七事件，所述第七事件包括第一侧行链路质量高于第二侧行链路质量的差值大于或等于第一偏移量；
    其中，所述第一侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量，所述第二侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量。
  35. 根据权利要求34所述的方法，其特征在于，
    所述第七事件的准入条件包括：所述第一侧行链路质量的测量值加上所述第一偏移量减去迟滞值大于所述第二侧行链路质量的测量值加上所述第一偏移量和最终偏移量；
    所述第七事件的离开条件包括：所述第一侧行链路质量的测量值加上所述第一偏移量减去迟滞值小于所述第二侧行链路质量的测量值加上所述第一偏移量和最终偏移量；
    其中，所述最终偏移量包括为当前测量对象所配置的偏移量。
  36. 根据权利要求34或35所述的方法，其特征在于，所述第一偏移量和所述最终偏移量根据以下粒度至少之一配置：
    小区级别的粒度；
    远端终端级别的粒度；
    中继终端级别的粒度；
    业务优先级别的粒度。
  37. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第八事件，所述第八事件包括第三侧行链路质量高于第二侧行链路质量的差值大于或等于第二偏移量；
    其中，所述第三侧行链路质量为所述第一远端终端和第二远端终端之间的侧行链路质量，所述第二侧行链路质量为所述第一远端终端和候选中继终端之间的侧行链路质量。
  38. 根据权利要求37所述的方法，其特征在于，
    所述第八事件的准入条件包括：所述第三侧行链路质量的测量值加上所述第二偏移量减去迟滞值大于所述第二侧行链路质量的测量值加上所述第二偏移量加上最终偏移量；
    所述第八事件的离开条件包括：所述第三侧行链路质量的测量值加上所述第二偏移量减去迟滞值小于所述第二侧行链路质量的测量值加上所述第二偏移量加上最终偏移量；
    其中，所述最终偏移量包括为当前测量对象所配置的偏移量。
  39. 根据权利要求37或38所述的方法，其特征在于，所述第二偏移量和所述最终偏移量根据以下粒度至少之一配置：
    小区级别的粒度；
    远端终端级别的粒度；
    中继终端级别的粒度；
    业务优先级别的粒度。
  40. 根据权利要求18至21任一所述的方法，其特征在于，所述测量上报触发事件，包括：
    第九事件，所述第九事件包括所述第一远端终端和第二远端终端之间的侧行链路质量高于第七门限值。
  41. 根据权利要求40所述的方法，其特征在于，
    所述第九事件的准入条件包括：所述第一远端终端和第二远端终端之间的侧行链路质量的测量值减去迟滞值大于所述第七门限值；
    所述第九事件的离开条件包括：所述第一远端终端和第二远端终端之间的侧行链路质量的测量值加上迟滞值小于所述第七门限值。
  42. 根据权利要求40所述的方法，其特征在于，所述测量上报触发事件还包括：
    第十事件，所述第十事件包括所述第一远端终端和服务中继终端之间的侧行链路质量低于第八门限值。
  43. 根据权利要求42所述的方法，其特征在于，
    所述第十事件的准入条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值加上迟滞值小于所述第八门限值；
    所述第十事件的离开条件包括：所述第一远端终端和服务中继终端之间的侧行链路质量的测量值减去迟滞值大于所述第八门限值。
  44. 根据权利要求24或28所述的方法，其特征在于，所述服务中继终端与所述第二远端终端之间的侧行链路质量由如下信令中的至少之一通知给所述第一远端终端：
    PC5-RRC消息；
    PC5-S消息；
    发现消息；
    SL-MAC CE；
    DCI。
  45. 根据权利要求18至44任一所述的方法，其特征在于，所述测量报告发送至如下实体中的至少之一：
    所述第一远端终端所连接的网络设备；
    所述第一远端终端所连接的服务中继终端；
    所述第一远端终端所连接的第二远端终端。
  46. 根据权利要求45所述的方法，其特征在于，所述测量报告携带在如下信令中的任意一种：
    RRC消息；
    PC5-RRC消息；
    PC5-S消息；
    SL MAC CE；
    UL MAC CE；
    SCI；
    UCI。
  47. 根据权利要求1至46任一所述的方法，其特征在于，所述方法还包括：
    在所述第一远端终端与服务中继终端之间的侧行链路质量低于第九门限值的情况下，确定所述第一远端终端与所述服务中继终端之间发生无线链路失败；
    或，
    在接收到的第二消息指示所述服务中继终端和第二远端终端之间的侧行链路质量低于第十门限值的情况下，确定所述服务中继终端和所述第二远端终端之间发生无线链路失败。
  48. 根据权利要求47所述的方法，其特征在于，所述第九门限值和所述第十门限值按照以下粒度中的至少之一进行配置：
    QoS flow；
    层二目标地址；
    SL-RB。
  49. 根据权利要求1至48任一所述的方法，其特征在于，所述方法还包括：
    在满足添加条件的情况下，将中继终端添加到合适的中继终端集合；
    按照选择方式从所述中继终端集合中，选择目标中继终端。
  50. 根据权利要求49所述的方法，其特征在于，所述添加条件包括：
    所述第一远端终端与所述中继终端之间的侧行链路质量高于第十一门限值。
  51. 根据权利要求50所述的方法，其特征在于，所述添加条件还包括：
    所述第一远端终端和所述第二远端终端之间的侧行链路质量低于第十二门限值。
  52. 根据权利要求49至51任一所述的方法，其特征在于，
    所述选择方式由所述第一远端终端实现；
    或，
    所述选择方式为选择侧行链路质量最高的中继终端；
    或，
    所述选择方式为由第二远端终端向第一远端终端进行指示。
  53. 根据权利要求52所述的方法，其特征在于，所述第二远端终端采用如下信令中的至少之一进行指示：
    发现消息；
    SL MAC CE；
    SCI。
  54. 根据权利要求1至53任一所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端通过所述第一远端终端的上层获取更新的PDCP；
    或，
    所述第一远端终端通过所述第一远端终端自身获取更新的PDCP密钥；
    或，
    所述第一远端终端通过第三消息获得所述更新的PDCP密钥，所述第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中由第二远端终端发送的，或者，所述第三消息是当第一远端终端由当前服务中继终端切换到目标中继终端的过程中向第二远端终端发送的。
  55. 根据权利要求54所述的方法，其特征在于，所述第三消息是所述目标中继终端向所述第二远端终端发送切换完成指示后触发所述第二远端终端发送的；或者，所述第三消息是所述目标中继终端向所述第二远端终端发送切换完成指示的同时所述第一远端终端通过所述目标中继终端向所述第二远端终端发送的。
  56. 根据权利要求54所述的方法，其特征在于，所述方法还包括：
    所述第一远端终端通过所述第一远端终端的上层触发，进行PDCP操作；
    或，
    所述第一远端终端通过第四消息触发，进行PDCP操作。
  57. 根据权利要求56所述的方法，其特征在于，所述PDCP操作包括如下至少之一：
    PDCP重建；
    PDCP数据恢复；
    丢弃存储的PDCP PDUs/SDUs。
  58. 根据权利要求56所述的方法，其特征在于，所述第四消息是所述第一远端终端发送给所述第二远端终端的；或者，所述第四消息是所述第二远端终端发送给所述第一远端终端的。
  59. 一种侧行链路的切换方法，其特征在于，所述方法由目标终端执行，所述方法包括：
    所述目标终端接收第一远端终端发送的PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
    所述目标终端向所述第一远端终端发送PC5-RRC连接建立响应。
  60. 一种侧行链路的测量上报方法，其特征在于，所述方法由第一远端终端执行，所述方法包括：
    在目标侧行链路和/或源侧行链路的侧行链路质量满足测量上报触发事件的情况下，发送测量报告；
    所述目标侧行链路是所述第一远端终端和目标终端之间的侧行链路，所述源侧行链路是所述第一远端终端和源终端之间的侧行链路。
  61. 一种侧行链路的释放方法，其特征在于，所述方法由第一远端终端执行，所述方法包括：
    所述第一远端终端在第一定时器停止或超时的情况下，释放源侧行链路；
    所述源侧行链路是所述第一远端终端和源终端之间的侧行链路，所述第一定时器是在所述第一远端终端发送PC5-RRC连接建立请求的情况下启动的，或，所述第一定时器是所述第一远端终端根据第一消息启动的。
  62. 一种侧行链路的释放方法，其特征在于，所述方法由服务中继终端执行，所述方法包括：
    所述服务中继终端在第二定时器超时，释放所述服务中继终端和第二远端终端之间的侧行链路。
  63. 根据权利要求62所述的方法，其特征在于，所述方法还包括：
    所述服务中继终端接收第二定时器的配置。
  64. 根据权利要求63所述的方法，其特征在于，所述第二定时器的配置由如下实体中的至少之一发送：
    所述服务中继终端所连接的网络设备；
    所述服务中继终端所连接的第一远端终端；
    所述服务中继终端所连接的所述第二远端终端。
  65. 根据权利要求62至64任一所述的方法，其特征在于，所述方法还包括：
    在所述服务中继终端发送第一消息时，启动所述第二定时器。
  66. 根据权利要求62至64任一所述的方法，其特征在于，所述方法还包括：
    在所述服务中继终端接收到第一远端终端发送的连接释放请求时，停止所述第二定时器。
  67. 一种侧行链路的释放方法，其特征在于，所述方法由第二远端终端执行，所述方法包括：
    在所述第二远端终端接收到服务中继终端发送的连接释放请求时，停止第三定时器。
  68. 根据权利要求67所述的方法，其特征在于，所述连接释放请求携带在如下信令中的任意一种：
    PC5-RRC；
    PC5-S；
    SL MAC CE；
    SCI。
  69. 根据权利要求67所述的方法，其特征在于，所述方法还包括：
    在所述第二远端终端向第一远端终端发送第一消息时，开启所述第三定时器。
  70. 根据权利要求67至69任一所述的方法，其特征在于，所述第三定时器的配置由如下实体中的至少之一发送：
    所述第二远端终端所连接的网络设备；
    所述第二远端终端所连接的第一远端设备；
    所述第二远端终端所连接的服务中继终端。
  71. 一种侧行链路的状态确定方法，其特征在于，所述方法由第一远端终端执行，所述方法包括：
    在所述第一远端终端与服务中继终端之间的侧行链路质量低于第九门限值的情况下，确定所述第一远端终端与所述服务中继终端之间发生无线链路失败；
    或，
    在接收到的第二消息指示所述服务中继终端和第二远端终端之间的侧行链路质量低于第十门限值的情况下，确定所述服务中继终端和所述第二远端终端之间发生无线链路失败。
  72. 一种侧行链路的选择方法，其特征在于，所述方法由第一远端终端执行，所述方法包括：
    在满足添加条件的情况下，将中继终端添加到合适的中继终端集合；
    按照选择方式从所述中继终端集合中，选择目标中继终端。
  73. 一种侧行链路的切换装置，其特征在于，所述装置包括：
    第一发送模块，用于所述第一远端终端向目标终端发送PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端终端和源终端之间的源侧行链路；
    第一接收模块，用于所述第一远端终端接收所述目标终端发送的PC5-RRC连接建立响应。
  74. 一种侧行链路的切换装置，其特征在于，所述装置包括：
    第二接收模块，用于所述目标终端接收第一远端终端发送的PC5-RRC连接建立请求，所述PC5-RRC连接建立请求用于请求建立所述第一远端终端和所述目标终端之间的目标侧行链路，以切换所述第一远端 终端和源终端之间的源侧行链路；
    第二发送模块，用于所述目标终端向所述第一远端终端发送PC5-RRC连接建立响应。
  75. 一种终端设备，其特征在于，所述终端设备包括：
    处理器；
    与所述处理器相连的收发器；
    用于存储所述处理器的可执行指令的存储器；
    其中，所述处理器被配置为加载并执行所述可执行指令以实现如权利要求1至60任一所述的侧行链路的测量上报方法，或者，实现如权利要求61至70任一所述的侧行链路的释放方法，或者，实现如权利要求71所述的侧行链路的状态确定方法，或者，实现如权利要求72所述的侧行链路的选择。
  76. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有可执行指令，所述可执行指令由处理器加载并执行以实现如权利要求1至60任一所述的侧行链路的测量上报方法，或者，实现如权利要求61至70任一所述的侧行链路的释放方法，或者，实现如权利要求71所述的侧行链路的状态确定方法，或者，实现如权利要求72所述的侧行链路的选择。
  77. 一种芯片，其特征在于，所述芯片包括可编程逻辑电路或程序，安装有所述芯片的终端用于实现如权利要求1至60任一所述的侧行链路的测量上报方法，或者，实现如权利要求61至70任一所述的侧行链路的释放方法，或者，实现如权利要求71所述的侧行链路的状态确定方法，或者，实现如权利要求72所述的侧行链路的选择。
  78. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机指令，所述计算机指令存储在计算机可读存储介质中，计算机设备的处理器从所述计算机可读存储介质读取所述计算机指令，所述处理器执行所述计算机指令，使得所述计算机设备执行如权利要求1至60任一所述的侧行链路的测量上报方法，或者，实现如权利要求61至70任一所述的侧行链路的释放方法，或者，实现如权利要求71所述的侧行链路的状态确定方法，或者，实现如权利要求72所述的侧行链路的选择。
  79. 一种通信系统，其特征在于，所述通信系统包括：第一远端终端、源终端、目标终端；
    所述第一远端终端、源终端、目标终端是如权利要求75所述的设备。
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