WO2021190442A1 - 副链路中继架构中的切换方法和设备 - Google Patents

副链路中继架构中的切换方法和设备 Download PDF

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Publication number
WO2021190442A1
WO2021190442A1 PCT/CN2021/082053 CN2021082053W WO2021190442A1 WO 2021190442 A1 WO2021190442 A1 WO 2021190442A1 CN 2021082053 W CN2021082053 W CN 2021082053W WO 2021190442 A1 WO2021190442 A1 WO 2021190442A1
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Prior art keywords
link
relay
message
terminal
information
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PCT/CN2021/082053
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English (en)
French (fr)
Inventor
刘佳敏
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维沃移动通信有限公司
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Priority to EP21774472.1A priority Critical patent/EP4080938A4/en
Priority to KR1020227023360A priority patent/KR20220114000A/ko
Publication of WO2021190442A1 publication Critical patent/WO2021190442A1/zh
Priority to US17/946,015 priority patent/US20230014969A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • 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
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the embodiments of the present application relate to the field of communications, and in particular to a handover and equipment in a sidelink (sidelink, or translated as side link, side link, etc.) relay architecture.
  • LTE Long Term Evolution
  • a sidelink relay (relay) scenario has been proposed in related technologies.
  • the remote terminal equipment (remote UE, or remote terminal for short) passes through the sidelink link (or relay link) between the relay terminal equipment (relay UE, or relay terminal for short). ), the relay terminal forwards its data to the network equipment.
  • the relay terminal In this sidelink relay scenario, data is transmitted between the remote terminal and the network device, and the relay terminal plays the role of data transfer.
  • the purpose of the embodiments of the present application is to provide a handover method and device in a sidelink relay architecture to solve the problem of service interruption caused by remote terminals in the sidelink relay architecture that cannot perform handover.
  • a handover method in a secondary link relay architecture is provided, the method is executed by a terminal device, and the method includes: receiving a first message from a network device, the first message containing handover information ; According to the switching information, switching from the source link to the target link, at least one of the source link and the target link is a relay link.
  • a handover method in a secondary link relay architecture is provided, the method is executed by a network device, and the method includes: sending a first message, where the first message includes handover information; and the handover information It is used to instruct the terminal device to switch from the source link to the target link, and at least one of the source link and the target link is a relay link.
  • a handover method in a secondary link relay architecture is provided, the method is executed by a relay terminal device, and the method includes: receiving a second message from a network device, the second message including Reconfiguration information; at least one of the following is performed based on the reconfiguration information: the configuration of the secondary link interface is added; the configuration of the secondary link interface is deleted; the Uu interface is reconfigured.
  • a terminal device including: a receiving module, configured to receive a first message from a network device, the first message containing switching information; and a link switching module, configured according to the switching information, Switching from the source link to the target link, and at least one of the source link and the target link is a relay link.
  • a network device including: a sending module, configured to send a first message, the first message containing switching information; the switching information is used to instruct the terminal device to switch from a source link to a target link At least one of the source link and the target link is a relay link.
  • a terminal device including: a receiving module, configured to receive a second message from a network device, the second message containing reconfiguration information; and a configuration update module, configured to be based on the reconfiguration information Perform at least one of the following: add the configuration of the secondary link interface; delete the configuration of the secondary link interface; reconfigure the Uu interface.
  • a terminal device in a seventh aspect, includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor.
  • the computer program When the computer program is executed by the processor, The handover method in the secondary link relay architecture as described in any one of the first aspect and the third aspect is implemented.
  • a network device in an eighth aspect, includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor.
  • the computer program When the computer program is executed by the processor, Implement the handover method in the secondary link relay architecture as described in the second aspect.
  • a computer-readable storage medium is provided, and a computer program is stored on the computer-readable storage medium.
  • the computer program is executed by a processor, any of the first, second, and third aspects is implemented
  • the network device to which the remote terminal belongs can send handover information, and the remote terminal performs handover according to the handover information, thereby completing the handover process to ensure business continuity and further improve system performance and user experience.
  • Fig. 1 is a schematic flowchart of a handover method in a secondary link relay architecture according to an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a handover method in a secondary link relay architecture according to another embodiment of the present application
  • Fig. 3 is a schematic flowchart of a handover method in a secondary link relay architecture according to still another embodiment of the present application
  • Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • Figure 5 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a terminal device according to still another embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of a network device according to another embodiment of the present application.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • 5G Long Term Evolution
  • NR New Radio
  • terminal equipment may include, but is not limited to, a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a user equipment (User Equipment, UE), and a mobile phone (handset) And portable equipment (portable equipment), vehicles (vehicle), etc.
  • the terminal equipment can communicate with one or more core networks through a radio access network (Radio Access Network, RAN), for example, the terminal equipment can be a mobile phone (or It is called a "cellular" phone), a computer with wireless communication function, etc.
  • the terminal device can also be a portable, pocket-sized, handheld, built-in computer or a mobile device in a vehicle.
  • a network device is a device deployed in a wireless access network to provide wireless communication functions for terminal devices.
  • the network device may be a base station, and the base station may include various forms of macro base stations, micro base stations, relay stations, and access points.
  • the names of devices with base station functions may be different.
  • an evolved NodeB evolved NodeB, eNB or eNodeB
  • 3G third generation
  • NodeB Node B
  • 5G 5G system
  • gNB Generation Node B
  • gNB network equipment in subsequent evolved communication systems, etc., however, the terminology does not constitute a restriction.
  • a typical sidelink relay scenario includes remote terminal equipment (remote UE, or remote terminal for short) and relay terminal equipment (relay UE, or relay terminal for short).
  • remote terminal equipment remote terminal equipment
  • relay terminal equipment relay terminal equipment
  • the serving cell/base station of the relay terminal is its own serving cell/base station, or the primary cell (Pcell) of the relay terminal It can be used as a service cell for remote terminals.
  • the serving cell of the remote terminal may also be another cell under the serving base station of the relay terminal, which is different from the serving cell of the relay terminal.
  • the core of the L2 sidelink relay architecture is the layer three protocol layers corresponding to the remote terminal, such as the radio resource control (Radio Resource Control, RRC) layer, the Packet Data Convergence Protocol (PDCP) layer, etc.
  • the layer three protocol stack is located Network equipment (such as base station) side.
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the serving cell can control the remote terminal to switch and change the path of the remote terminal.
  • an embodiment of the present application provides a handover method 100 in a secondary link relay architecture.
  • the method can be executed by the terminal device.
  • the method can be installed on The software or hardware of the terminal device is executed, and the method includes the following steps.
  • S102 Receive a first message from a network device, where the first message includes handover information.
  • This embodiment can be executed by a terminal device: the terminal device can be directly connected to the network device.
  • the terminal device is switched from the Uu link directly connected to the network device to the relay chain connected to the relay terminal road.
  • the terminal device can also be a remote terminal.
  • the terminal device is switched from the relay link connected to the relay terminal to the Uu link directly connected to the network device; or, the terminal device is connected to the relay terminal The relay link is switched to the relay link connected to another relay terminal.
  • the first message may be a reconfiguration message, such as an RRCReconfiguration message.
  • the first message includes handover information.
  • the handover information may be mobilityinfo.
  • S104 Switch from the source link to the target link according to the switching information, and at least one of the source link and the target link is a relay link.
  • the terminal device can switch from the relay link to the Uu link according to the switching information; it can also switch from the Uu link to the relay link; it can also switch from the relay link to the relay link.
  • the terminal device switches from the first relay link to the first Uu link according to the switching information.
  • the first relay link and the first Uu link may belong to the same network node (which may refer to the network device , Serving cell, serving base station, etc., follow-up similar), can also belong to different network nodes.
  • the terminal device switches from the second Uu link to the second relay link according to the switching information.
  • the second relay link and the second Uu link may belong to the same network node or belong to the same network node. In different network nodes.
  • the terminal device switches from the third relay link to the fourth relay link according to the switching information.
  • the third relay link and the fourth relay link may belong to the same network node, and Can belong to different network nodes.
  • the terminal device may also send a completion message for the first message to the network device, where the completion message is used to indicate that the terminal device switching is completed.
  • the terminal device directly sends a completion message to the target network device; if the target link after the handover is a relay link, the terminal device sends the target relay terminal After sending the completion message, the target relay terminal forwards the completion message to the network device.
  • the network device to which the remote terminal belongs can send switching information, and the remote terminal performs switching according to the switching information, thereby completing the switching process to ensure business continuity and further improve the system Performance and user experience.
  • the serving cell can perform measurement configuration on the terminal device for the terminal device to its surrounding cells and/or relay terminals Perform measurement and report the measurement report when the reporting conditions are met.
  • a terminal device such as a remote terminal (Remote UE) establishes a connection with its serving cell/base station
  • the serving cell can perform measurement configuration on the terminal device for the terminal device to its surrounding cells and/or relay terminals Perform measurement and report the measurement report when the reporting conditions are met.
  • the method before the embodiment 100 receives the first message from the network device, the method further includes: receiving measurement configuration information; and performing measurement report according to the measurement configuration information.
  • the above measurement configuration information is used to instruct the terminal device to measure at least one of the following 1) to 4): 1) the signal quality of the current serving cell; 2) the signal quality of potential cells other than the serving cell, and That is, it is possible for the terminal equipment to switch to the potential cell, which may be a neighboring cell of the serving cell, etc.; 3) Link quality with the relay terminal currently serving; 4) Communication with the potential relay terminal Link quality, that is, it is possible for the terminal device to switch to establish a relay link with the potential relay terminal.
  • the above-mentioned measurement configuration information is used to instruct the end device to measure the link quality with the potential relay terminal in 4) above.
  • the method further includes the following 1 ) And 2) at least one of the two steps.
  • the potential relay terminal actively sends a broadcast message to show that it supports the provision of relay services to other UEs.
  • the broadcast message may also include supported service information, that is, the potential relay terminal may broadcast the service information that it can support relaying.
  • the request message is used to request a relay terminal that provides a relay service; receive a response message from the potential relay terminal, the response message is used to instruct the potential relay terminal to support the provision of Relay service.
  • the terminal device broadcasts a message to the surroundings asking which relay terminals can provide relay services for itself, and a capable potential relay terminal can respond and inform the remote terminal that it supports providing relay services.
  • the request information sent by the terminal device may also carry service information, and only the potential relay terminal that can support the service providing relay service for the service (corresponding to the service information) responds,
  • the above-mentioned measuring the link quality with the potential relay terminal includes: measuring the link quality with the potential relay terminal according to at least one of the following 1) to 4) : 1) the broadcast message; 2) the request message; 3) the response message; 4) the reference signal from the potential relay terminal.
  • the potential relay terminal reported by the terminal device is among the multiple potential relay terminals: 1) the potential relay terminal with the best link quality; or 2 ) Potential relay terminals capable of providing preset service requirements, such as service requirements such as large bandwidth and low latency; or 3) Potential relay terminals that have an association relationship with the terminal device, such as the user’s The binding relationship established between the wearable device and the user's mobile phone.
  • the measurement report according to the measurement configuration information mentioned in each of the foregoing embodiments includes: reporting when at least one of the following 1) to 9) is met.
  • the measurement result of the serving cell or the relay terminal currently serving is higher than the first threshold (it can be understood that the first threshold corresponding to the serving cell and the first threshold corresponding to the relay terminal may be different, and the subsequent examples are similar) .
  • the measurement result of the serving cell is lower than the fourth threshold, and the measurement result of the potential relay terminal is higher than the fifth threshold.
  • the measurement result of the relay terminal currently serving is lower than the sixth threshold, and the measurement result of the potential relay terminal or the potential cell is higher than the seventh threshold.
  • the measurement result of the potential cell across the radio access technology (RAT) or the potential relay terminal across the RAT is higher than the eighth threshold.
  • the measurement result of the serving cell is lower than the ninth threshold, and the measurement result of the potential relay terminal across RATs is higher than the tenth threshold.
  • the measurement result of the relay terminal currently serving is lower than the eleventh threshold, and the measurement result of the potential relay terminal across RATs or the potential cell across RATs is higher than the twelfth threshold.
  • these thresholds may all be different, or may be partly the same and partly different.
  • the terminal device may also receive PDCP reconstruction instruction information; according to the PDCP reconstruction instruction information, perform operations of security reset and header compression reset.
  • the terminal device may also receive PDCP recovery indication information; and perform data recovery related operations according to the PDCP recovery indication information.
  • the method further includes: sending a first status report; according to the received second status report, retransmitting in the The source link did not transmit a successful packet.
  • the embodiment 100 further includes at least one of the following: deleting the RLC entity configuration; deleting the configuration related to the source link at the MAC layer; and stopping the timer related to the source link at the MAC layer.
  • the serving cell when a UE is directly connected to the serving cell or the UE is connected to the serving cell through a relay, the serving cell can be based on UE capability information (for example, whether to support cross-carrier capability) or tendency information (for example, energy saving is expected). , It is more desirable to connect to a relay link, etc.), or to request information (for example, energy saving is desired, and a Uu link is more desirable to connect, etc.) to configure measurement configurations related to sidelink relay path switching for the UE.
  • UE capability information for example, whether to support cross-carrier capability
  • tendency information for example, energy saving is expected
  • the serving cell For a remote UE connected to a serving cell through a relay UE, the serving cell clearly knows that this is a remote UE through the information in the signaling and/or path information, and can learn the relay UE node corresponding to the remote UE, then optionally After querying the remote UE capabilities/inclinations/requests, etc., the measurement configuration can be configured for the remote UE for the next handover to select the target node (which may be a network node or a relay terminal).
  • the target node which may be a network node or a relay terminal
  • the serving cell can query the UE's capabilities/inclinations/requests, etc., and configure measurement configuration for it, for example, send measurement configuration information for the next handover to select the target relay node.
  • the UE measurement configuration mainly includes at least one of the following 1) to 4).
  • the signal quality of the UE’s current serving cell (the UE directly connects to the serving cell, and/or the remote UE connects to the serving cell through a relay UE), the signal quality such as reference signal received power (RSRP), reference signal received power ( RSRQ) and so on.
  • RSRP reference signal received power
  • RSRQ reference signal received power
  • the UE can be configured for periodic reporting or event-triggered reporting.
  • Event-triggered can configure the measurement threshold. If the RSRP of the serving cell is lower than threshold 1, or the RSRP of the serving cell is higher than threshold 2, the measurement report can be triggered. .
  • the UE measures the signal quality of other non-serving cells (referred to as other potential cells), such as RSRP, RSRQ, etc.
  • the UE can be configured for periodic reporting or event-triggered reporting, where the event trigger can be configured with a measurement threshold, for example, the RSRP of the potential cell is higher than the threshold 1, or the RSRP of the potential cell is higher than the RSRP of the own cell plus an offset Can trigger measurement report reporting.
  • the event trigger can be configured with a measurement threshold, for example, the RSRP of the potential cell is higher than the threshold 1, or the RSRP of the potential cell is higher than the RSRP of the own cell plus an offset Can trigger measurement report reporting.
  • the remote UE can be configured for periodic reporting or event-triggered reporting.
  • the event-triggered event can be configured with a measurement threshold, for example. When the link quality between the remote UE and the current relay UE is lower than the threshold, the measurement report is triggered.
  • the UE can obtain continuous and stable measurement results by measuring the signal, but to save resources and reduce interference , UEs generally do not send periodic reference signals specifically for measurement.
  • the measurement between UE and UE is generally performed by reference signals carried by data.
  • the measurement value is performed Special processing, for example, the measured value is not updated or the measured value of the previous cycle is adopted, or special report is performed. For example, in the periodic report, there is no measured value in this cycle and directly report null.
  • the UE measures the link quality with other potential relay UEs.
  • the remote UE can be configured as event-triggered reporting, for example, when the link quality with other potential relay UEs is higher than the threshold, or the link quality with other potential relay UEs is higher than the current service Relay Report when UE quality plus offset, etc.
  • the method for the UE to measure the surrounding potential relay UE can be as follows:
  • the UE needs to clearly know that the other party's relay UE is a UE that has the relay function and can provide the relay function for itself.
  • the relay UE actively sends information and broadcasts it to the surroundings, showing that it can support relay services to other UEs; the other is the way that the remote UE makes requests, and the remote UE broadcasts to the surroundings.
  • the link between the remote UE and the corresponding relay UE can be determined to meet the communication requirements, and the link between the remote UE and the relay UE can be completed through the above-mentioned response or signal detection and measurement in the broadcast process.
  • the remote UE continuously monitors the signal sent by the relay UE (for example, measurement reference signal, or data reference signal, etc.) to further confirm the link quality.
  • the link quality between the remote UE and the relay UE needs to meet the minimum threshold requirement.
  • the remote UE can select the appropriate one among all the relay UEs that meet the minimum link quality threshold and report it to the network device: 1 ⁇ If the services provided by each relay UE are similar, you can choose the best link quality; 2.
  • the relay service requirements of the remote UE are higher, such as large bandwidth or low delay, you can choose to provide these services
  • For the relay UE select the candidate with the best link quality, or the highest capability, or a balance between the two among the candidates that meet the requirements; 3.
  • the remote UE has special requirements, for example, it has a binding relationship with the relay UE.
  • a typical example is that a mobile package is generally shared between the user’s mobile phone and the user’s wearable device. If there are advantages in billing and services, the measurement report can be preferred.
  • the trigger conditions for triggering the measurement report reporting are related to the measurement report trigger events between the serving cell, the serving relay UE, other potential cells, and other potential relay UEs, except for those mentioned in the above examples.
  • the measurement result of serving relay UE is lower than threshold 1, and the measurement result of other potential relay UE is higher than threshold 2; cross-RAT (RADIO ACCESS TECHNOLOGY)
  • the measurement results of other potential cells of radio access technology are higher than the threshold; the measurement results of other potential relay UEs across RATs are higher than the threshold; the measurement result of the serving cell is lower than the threshold 1, and the measurement results of other potential cells across RATs Higher than threshold 2; the measurement result of the serving cell is lower than threshold 1, and the measurement result of other potential relay UEs across RATs is higher than threshold 2; the measurement result of serving relay UE is lower than threshold 1, and the measurement result of other potential cells across RATs is lower than threshold 1.
  • the measurement result is higher than the threshold 2; the measurement result of the serving relay UE is lower than the threshold 1, and the measurement result of other potential relay UEs across RATs is higher than the threshold 2.
  • the aforementioned other potential cells across RATs are, for example, LTE cells, and other relay UEs across RATs, for example, LTE V2X UEs (only LTE PC5/sidelink interfaces are supported).
  • threshold 1 and threshold 2. These thresholds may all be different, or some of them may be the same, some may be different, and so on.
  • the measurement results from the network equipment are only compared with the measurement structure from the same network equipment, and the measurement results from the relay are only compared with the measurement results from the relay UE.
  • the two generally do not directly compare the size and can meet their respective requirements. Threshold requirements, or the threshold needs to be met at the same time to trigger.
  • the measurement result of the serving cell needs to be lower than the threshold, and the measurement result with the relay UE is higher than the threshold.
  • the event trigger condition is met, and the measurement report is reported.
  • the network device receives such a measurement report, it can switch the UE from the Uu link to the relay link.
  • Embodiment 2 Switch between the Uu link and the relay link of the common network device (base station)
  • This embodiment of the application provides a typical handover process in the L2 sidelink relay architecture, that is, the handover process between the UE1 ⁇ ->gNB1 link and the remote UE1 ⁇ ->relay UE2 ⁇ ->gNB1 link.
  • UE1 in the previous link and remote UE1 in the next link are the same terminal equipment, but have different names in different links.
  • the switching process provided by this embodiment is as follows.
  • Step 0 UE1/remote UE1 accesses gNB1, selects a cell under gNB1 as its serving cell cell1, and establishes an RRC connection between UE1 and cell1.
  • UE1 may have multiple serving cells, for example, multiple secondary cells (secondary, Scell) configured in the case of carrier aggregation (CA).
  • cell1 may be the primary cell (primary cell).
  • relay UE1 If it is remote UE1, it establishes a connection with cell1 through relay UE2, that is, the RRC protocol stack peers are located in remote UE1 and cell1 respectively, and relay UE2 only performs Layer 2 transfer of data.
  • cell1 is also the serving cell of relay UE2, and it is usually the Pcell or spcell of relay UE2. If it is a remote UE1, because it is logically connected to gNB1, it can only connect to one cell1, and there is no need to view other Scells of the relay UE2.
  • Step 1 Cell1 configures measurement for UE1.
  • cell1 can configure various combined measurement quantities for serving cells, other cells, serving relays, and other relays according to the capabilities/inclinations/requests of UE1.
  • the most effective measurement configuration is that the serving cell is below the threshold and the relay UE is above the threshold. After this condition is met, it is convenient for gNB1 to switch the UE to the relay link as soon as possible.
  • UE1 is a remote UE. According to whether it has a bound relay relationship, the network side can configure different measurement configurations. If remote UE1 is open to access any relay UE, the measurement configuration needs to consider the service relay UE quality, and other potential Relay UE quality, serving cell quality and other potential cell quality, etc., to easily determine whether remote UE1 chooses other relay links or Uu links; if remote UE1 only wants to access a specific relay UE2, only the service needs to be considered in the measurement configuration Relay quality, serving cell quality and other cell quality, etc., are convenient for remote UE1 to choose the best among relay UE2 and Uu links.
  • the measurement configuration is transferred through relay UE2, first sent from cell1 to relay UE2 through the Uu interface, and then from relay UE2 to remote UE1 through the sidelink interface.
  • Step 2 UE1 meets the measurement trigger condition and reports the measurement result to cell1.
  • the measurement trigger generally includes that the link quality of the current node is poor and/or the link quality of other nodes is good. For example, when UE1 is directly connected to cell1, it is reported that the link quality of cell1 is lower than the threshold, and the link quality of UE2 is higher than the threshold. Then UE1 can be switched from the path directly connected to cell1 to the path connected to cell1 through relay UE2. path. Conversely, when remote UE1 is connected to cell1 through relay UE2, it is reported that the link quality of cell1 is higher than the threshold, and the link quality of relay UE2 is lower than the threshold. Then UE1 can be switched from the path connected to cell1 through relay UE2 to direct connection. The path to cell1.
  • cell1 may need to interact with relay UE2, whether relay UE2 supports UE1 to switch from direct link to relay UE2's relay path, and after obtaining the confirmation of relay UE2, send the reconfiguration information/ Switch command.
  • this process can also be omitted.
  • Remote UE1 and relay UE2 confirm each other in the measurement phase. Only when relay UE2 agrees to accept remote UE1, remote UE1 will report the measurement results related to relay UE2.
  • Step 3 Cell1 sends the first message to UE1.
  • the first message may be a reconfiguration message, which contains switching information, for example, a new path indication, and a configuration under the new path.
  • cell1 informs UE1 to switch to relay UE2 through the first message, and carries the configuration related to the relay UE2 link at the same time.
  • each data radio bearer Data Radio Bearer, DRB
  • signaling radio bearer Signaling Radio Bearer, SRB
  • the security operation decides whether to perform the security update process according to the needs.
  • the RLC/MAC/PHY layers of UE1 will be directly connected to the relay UE2, so they can be reconfigured. Of course, it can also be in the old logic. Make incremental changes to the configuration. You can also carry some configurations of UE1 on the sidelink link, because UE1 has a better understanding of the business situation of cell1, and you can directly configure sidelink link resources for UE1 at this time, for example, a resource pool or authorized dedicated periodic resources.
  • remote UE1 is connected to cell1 through relay UE2, cell1 informs UE1 to switch to the path directly connected to cell1 through the first message, carrying the new path configuration.
  • the third part of the layer has not changed, and the PDCP/RRC is still anchored in cell1. Therefore, the two layers generally do not need to be reconfigured (of course, you can also reconfigure).
  • the security operation determines whether to perform the security update process according to the needs, UE1
  • the RLC/MAC/PHY layers of the RLC/MAC/PHY will be directly connected to cell1, so they need to be reconfigured. Of course, the old configuration can also be incrementally changed logically. It is also possible to carry some configurations of UE1 on the Uu link, because the service situation of UE1 is better known to cell1. At this time, UE1 can be directly configured with Uu link resources, such as authorized dedicated periodic resources.
  • step 4 cell1 sends a second message (for example, a reconfiguration message) to relay UE2, which carries path information and configuration information about remote UE1.
  • a second message for example, a reconfiguration message
  • cell1 informs relay UE2 about remote UE1 to switch over through the second message, configure sidelink configuration for relay UE2 to facilitate communication with remote UE1, and configure or modify the configuration of the Uu interface for relay UE2 , In order to carry remote UE1 data.
  • cell1 informs relay UE2 that remote UE1 wants to switch away through a second message, and can release the sidelink connection with remote UE1, and delete the configuration or modification of Uu interface for relay UE2. Configure to release the resources used to carry remote UE1 data.
  • Step 4 UE1 receives the first message of cell1, and after accessing the new node, sends a completion message of the first message (for example, handover completion signaling) to cell1.
  • a completion message of the first message for example, handover completion signaling
  • UE1 directly connected to cell1 receives the command to switch to relay UE2, that is, the first message, it initiates the establishment of PC5RRC and bearer with relay UE2, applies the relevant configuration, and sends the handover completion signaling to relay UE2, and then forwards it to cell1 .
  • remote UE1 If remote UE1 is connected to cell1 through relay UE2 and receives a command to switch to directly connected cell1, that is, the first message, it initiates a random access procedure to cell1, applies Uu interface configuration, sends a handover completion signal to cell1, and releases the Relay PC5RRC and bearer of UE2.
  • relay UE2 receives the second message of cell1, and after making a link change, sends a completion message of the second message to cell1.
  • relay UE2 If UE1 is directly connected to cell1 and receives the command to switch to relay UE2, that is, the second message, relay UE2 establishes PC5 RRC and bearer with remote UE1, applies the relevant sidelink configuration and Uu configuration, and sends the completion message of the second message (handover completion letter). Command) to cell1, and relay the signaling and data of UE1 remotely.
  • relay UE2 If UE1 connects to cell1 through relay UE2 and receives the command to switch the direct connection, that is, the second message, relay UE2 disconnects the sidelink link with remote UE1, applies the relevant Uu configuration modification, and sends the completion message of the second message (handover complete) Signaling) to cell1.
  • Step 5 Cell1 receives the handover completion signaling of UE1 (that is, the completion message of the first message).
  • cell1 receives the completion message of the second message of relay UE2, and the entire handover process ends.
  • Embodiment 3 Switch between the relay link and the relay link of the common base station
  • This embodiment provides a process for the remote UE1 to switch between the relay UE2 and the relay UE3, where the serving base station of the relay UE2 and the relay UE3 are the same, and no cross-base station interaction is required.
  • the switching process in this embodiment is as follows.
  • Step 0 Remote UE1 first establishes a connection with cell1 through relay UE2, the anchor point of the layer 3 protocol stack of remote UE1 is in cell1, and relay UE2 transfers data through the L2 protocol stack.
  • Step 1 Cell1 configures measurement for remote UE1.
  • remote UE1 is an open UE, or both relay UE2 and relay UE3 belong to its expected connection device.
  • the measurement configuration information can include measuring the link quality of the serving relay UE2, measuring the Uu link quality (the serving cell cell1, and other cells), and measuring the link quality of other potential relay UEs (including relay UE3).
  • Step 2 A measurement event is triggered, and UE1 remotely reports the measurement result.
  • the measurement event in this embodiment is: the link quality of the serving relay UE2 is lower than the threshold, and/or the link quality of the potential relay UE3 is higher than the threshold, or the link quality of the serving relay UE2 is lower than the potential relay The link quality of UE3 plus offset, etc.
  • cell1 can also interact with relay UE3, for example, inquire whether relay UE3 supports the relay path of UE1 being switched from relay UE2 to relay UE3, and send the first message after obtaining the confirmation from relay UE3 .
  • this process can also be omitted.
  • Remote UE1 and relay UE3 confirm each other in the measurement phase. Only when relay UE3 agrees to accept remote UE1, remote UE1 will report the measurement results related to relay UE3.
  • Step 3 Cell1 sends a first message to remote UE1 to inform remote UE1 to switch to relay UE3.
  • the first message may include the configuration update of the bearer or layer 3. Generally, it does not need to be updated because there is no change, indicating whether the security operation is updated, and carrying the sidelink configuration of the new link.
  • step 4 cell1 sends a second message (for example, a reconfiguration message) to relay UE2 to inform remote UE1 to be handed over by relay UE2.
  • a second message for example, a reconfiguration message
  • the second message may include the reconfiguration of the relay UE2 Uu interface, such as deleting some DRBs, or deleting some data streams mapped in the DRB, deleting the configuration related to remote UE1 transmission, and instructing the release of sidelink resources and configurations. .
  • step 4 cell1 sends a second message to relay UE3 to inform remote UE1 to switch to relay UE3.
  • the second message contains the reconfiguration of the relay UE3 Uu interface, for example, adding or modifying some DRBs, or adding some data streams mapped in the DRB, adding configurations related to remote UE1 transmission, and indicating sidelink resource allocation and Configuration.
  • Step 4 Remote UE1 receives the first message, releases the PC5 RRC connection with the source relay UE2, establishes PC5 RRC with the target relay UE3, and the corresponding data bearer configuration, and then sends the completion message of the first message (handover completion letter) to cell1. make).
  • the relay UE2 After the relay UE2 receives the second message, it releases the PC5 RRC connection with the remote UE1, executes the Uu interface bearer change configuration according to the new configuration, and then sends the completion message of the second message to cell1.
  • the relay UE3 After the relay UE3 receives the second message, it establishes a PC5 RRC connection and bearer with the remote UE1, performs Uu interface bearer configuration according to the new configuration, and then sends a completion message of the second message to cell1.
  • Step 5 Cell1 receives the completion message of remote UE1, and optionally, receives the completion message of relay UE2 and the completion message of relay UE3, and considers that the handover process is over.
  • Embodiment 4 Switch between Uu link and relay link across base stations
  • This embodiment is similar to the second embodiment.
  • the switch between the Uu link and the relay link is given.
  • the difference is that the source path and the target path of the second embodiment are both under the control of the same base station, and this embodiment considers the cross-base station Scenes.
  • This embodiment omits the parts similar to the second embodiment during the introduction, and focuses on the differences from the second embodiment.
  • the switching steps are as follows.
  • Step 0 UE1 directly accesses or UE2 accesses cell1 under gNB1 through a relay.
  • Step 1 Cell1 configures measurement for UE1.
  • the measurement configuration for the UE1 may or may not be restricted to other potential neighboring cells/neighboring base stations; or the relay UE under the neighboring cells/neighboring base stations.
  • Step 2 UE1 triggers the measurement report and reports the measurement result to cell1.
  • These measurement results generally include the cell of the neighboring base station, or the relay UE under the neighboring base station.
  • the remote UE1 located at the edge of the cell due to the deterioration of its relay link, for example, the sidelink link quality is lower than the threshold, and the link quality of the UE1 to cell2 under the neighboring gNB2 is higher than the threshold; or the UE1 at the edge of the cell directly connected to cell1,
  • the link quality of the cell is lower than the threshold, and the link quality between UE1 and the relay under cell2 of the neighboring cell gNB2 is higher than the threshold.
  • Step 3 Cell1 (under gNB1) decides to switch UE1 to the neighboring base station gNB2, and initiates a handover request to the neighboring base station through the Xn interface between the base stations (the interface between NR base stations) or the X2 interface (the interface with the LTE base station).
  • the handover request generally carries the configuration, service conditions, measurement results, etc. of the UE1 in the source cell, and is sent by gNB1 to gNB2.
  • Step 4 After receiving the handover request information carried in the inter-base station interface message sent by gNB1, gNB2 makes admission decision and configuration, and returns configuration information under the new link to gNB1.
  • gNB2 makes the decision directly.
  • gNB2 can first confirm to relay UE2, and then reply to the handover acceptance result and configuration after obtaining permission confirmation; or by default before When UE1 and UE2 are performing sidelink measurements, they have already exchanged information that each other can support relay.
  • UE1 can be placed in UE2 reported in the measurement report, indicating that UE2’s capabilities and willingness have been confirmed, so there is no need to consult UE2 here, gNB2 does it directly Decision and configuration.
  • the configuration information returned by gNB2 to gNB1 mainly includes one of the following 1) and 2).
  • step 5 cell2 under gNB2 sends a second message (such as a reconfiguration message) to relay UE2 for sidelink interface configuration and resource configuration with UE1, and Uu interface bearer change Wait; after UE2 applies the second message for configuration, it returns the completion message of the second message to cell2.
  • a second message such as a reconfiguration message
  • Step 5 gNB1 receives the handover acceptance message and configuration message returned by gNB2, organizes them into the first message, and sends it to UE1 by cell1.
  • Step 6 UE1 receives the message, disconnects the source connection, accesses the new target node, applies the new configuration, and returns a completion message to the new serving cell cell2.
  • the new configuration is applied, the sidelink link is established with the relay UE2, and the completion message is returned to the cell2 through the relay UE2.
  • Step 7 Cell2 receives the completion message of UE1, and optionally, receives the completion message of relay UE2, and considers that the handover is successful, and the handover is completed.
  • Embodiment 5 switching between relay link and relay link across base stations
  • This embodiment provides a process for remote UE1 to switch from relay UE2 under gNB1 to relay UE3 under gNB2.
  • the switching process is as follows.
  • Step 0 Remote UE1 accesses cell1 under gNB1 through relay UE2.
  • Step 1 Cell1 configures measurement for remote UE1.
  • the measurement quantity can include various measurements of neighboring cells and the measurement of relay UE in neighboring cells.
  • Step 2 Remote UE1 triggers a measurement event and reports measurement to cell1.
  • possible measurement and report results include that the link quality from remote UE1 to relay UE2 is lower than the threshold, and/or the link quality from remote UE1 to relay UE3 is higher than the threshold, and relay UE3 belongs to the base station/cell information.
  • Step 3 Cell1 decides to switch remote UE1 from relay UE2 to relay UE3 under neighboring gNB2.
  • gNB1 sends an interface message to gNB2, carrying handover request information, including UE1’s configuration and service information in the source cell.
  • Step 4 gNB2 receives the handover request message, generates admission and configuration information, and returns successful admission and configuration information to gNB1.
  • gNB2 may perform signaling interaction with relay UE3, asking whether to agree to remote UE1 access, and the acceptance is successful only after confirmation.
  • step 5 cell2 sends a second message (for example, a reconfiguration message) to relay UE3, including the sidelink configuration and Uu port configuration update of relay UE3 and remote UE1; relay UE3 receives the second message After that, the completion message of the second message is sent to cell2.
  • a second message for example, a reconfiguration message
  • Step 5 Cell1 receives the successful admission and configuration information, organizes the first message and sends it to UE1.
  • the first message mainly includes bearer configuration, sidelink interface configuration, resource configuration, and so on.
  • cell1 sends a second message to relay UE2 to release and modify the sidelink configuration related to remote UE1 and the Uu interface configuration; relay UE2 is successfully configured and returns a completion message to cell1.
  • Step 6 UE1 receives the first message, performs new configuration according to the instructions, releases the old sidelink connection with relay UE2, establishes a new connection with relay UE3, and the corresponding bearer and layer three configuration, and sends it to cell2 through relay UE3 Complete the message.
  • Step 7 Cell2 receives the response from UE1 and the completion message from UE3, and considers that the handover is complete.
  • Embodiment 6 PDCP/RLC/MAC processing and data forwarding caused by remote UE handover
  • each layer performs the following operations:
  • PDCP layer apply the new configuration, if it receives a PDCP rebuild instruction, it will perform a safety reset and a header compression reset, and take the safety operations and header compression after resetting for subsequent data, and if the AM is configured with a status report function, it will report to The opposite end returns a status report, and according to the status report sent by the opposite end, retransmits the unsuccessful data packet, and then starts a new data transmission. If the PDCP data recovery instruction is received, the corresponding behavior of data recovery is executed, security and header compression continue. If the AM is configured with the status report function, the status report will be returned to the opposite end, and the status report sent by the opposite end will be restarted. Transmission of unsuccessful data packets, and then start a new data transmission.
  • remote UE serving cells belong to different gNBs, which can instruct PDCP re-establishment to maintain security isolation between different nodes. If the service cell of the remote UE does not change or belongs to the same gNB, PDCP data recovery can be selected in principle, because at this time only the data path has changed, and the PDCP anchor point has not changed. It is still in cell1/gNB1, and security can continue. , But it can also instruct PDCP to rebuild and perform a security update process.
  • the RLC entity configuration is deleted, all unfinished PDUs/SDUs are deleted, the new configuration is applied, and the data is retransmitted.
  • the MAC layer deletes and stops the configuration and timers related to the source link, and reapplies the new configuration.
  • Source relay UE delete all configuration and data related to remote UE.
  • New relay UE establish new sidelink bearer and configuration for remote, modify Uu interface configuration, etc.
  • the data anchor point is still under the same gNB, no data forwarding is required, and the gNB performs PDCP reconstruction or data recovery instructions as needed, and performs data on the AM support status report bearer. Receive status feedback and retransmission process.
  • gNB1 needs to send the PDCP SN status to gNB2, and according to the negotiation, UE1's up and down The line data is forwarded to gNB2 and sent on the new path.
  • the handover method in the secondary link relay architecture according to the embodiment of the present application is described in detail above with reference to FIG. 1.
  • the handover method in the secondary link relay architecture according to another embodiment of the present application will be described in detail below with reference to FIG. 2. It can be understood that the interaction between the network device and the terminal device described from the network device side is the same as the description on the terminal device side in the method shown in FIG. 1, and to avoid repetition, the related description is appropriately omitted.
  • FIG. 2 is a schematic diagram of the implementation process of the switching method in the secondary link relay architecture of the embodiment of the present application, which can be applied to the network device side.
  • the method 200 includes: S202: Send a first message, the first message contains switching information; the switching information is used to instruct the terminal device to switch from the source link to the target link, the source link and the target link At least one of them is a relay link.
  • the network device to which the remote terminal belongs can send switching information, and the remote terminal performs switching according to the switching information to complete the switching process to ensure business continuity and further improve system performance and user experience.
  • the method further includes: sending a second message, the second message containing reconfiguration information; the reconfiguration information is used to instruct the relay terminal to perform at least one of the following: The configuration of the road interface is added; the configuration of the secondary link interface is deleted; the reconfiguration of the Uu interface.
  • the method before the sending the first message, further includes: sending an access request message to the target relay terminal, where the request message is used to request the terminal device to access the target relay. Terminal; receiving a response message from the target relay terminal, the response message indicating that the terminal device is allowed to access.
  • the method further includes: sending a handover request message to the target network device; the handover request message is used to request the terminal device to switch to the target relay terminal, where the target relay terminal is located in the In the cell provided by the target network device; or the handover request message is used to request the terminal device to switch to the cell provided by the target network device.
  • the method further includes: receiving configuration information from the target network device; the configuration information includes at least one of the following: Uu configuration of the target network device; The configuration related to the bearer of the device; the configuration of the secondary link interface of the target relay terminal; the configuration of the secondary link resource of the target relay terminal.
  • the method further includes: sending measurement configuration information; the measurement configuration information is used to instruct the terminal device to perform measurement report.
  • FIG. 3 is a schematic diagram of the implementation process of the switching method in the secondary link relay architecture of the embodiment of the present application, which can be applied to the side of the relay terminal. As shown in FIG. 3, the method 300 includes the following steps.
  • S302 Receive a second message from the network device, where the second message includes reconfiguration information.
  • S304 Perform at least one of the following based on the reconfiguration information: add configuration of the secondary link interface; delete the configuration of the secondary link interface; and reconfigure the Uu interface.
  • the network device to which the remote terminal belongs can send handover information, and the remote terminal performs handover according to the handover information, thereby completing the handover process to ensure business continuity and further improve system performance and user experience.
  • the method further includes: receiving an access request message from the network device, the request message is used to request the terminal device to access; and sending a response message, the response message indicating permission The terminal device accesses.
  • the method further includes: establishing an RRC connection of the PC5 interface and a bearer of the PC5 interface with the terminal device; and sending the completion message switching completion signaling of the second message to the network device.
  • the method further includes: releasing the RRC connection with the PC5 interface of the terminal device and the bearer of the PC5 interface; and sending the completion message switching completion signaling of the second message to the network device.
  • the handover method in the secondary link relay architecture according to the embodiment of the present application is described in detail above with reference to FIGS. 1 to 3.
  • the terminal device according to the embodiment of the present application will be described in detail below with reference to FIG. 4.
  • Fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 400 includes: a receiving module 402, which can be used to receive a first message from a network device, where the first message contains switching information; and a link switching module 404, which can be used to switch according to the Information, switching from a source link to a target link, and at least one of the source link and the target link is a relay link.
  • the network device to which the remote terminal belongs can send handover information, and the remote terminal performs handover according to the handover information, thereby completing the handover process to ensure business continuity and further improve system performance and user experience.
  • the link switching module 404 may be configured to switch from the first relay link to the first Uu link according to the switching information; or from the second Uu link according to the switching information The link is switched to the second relay link; or according to the switching information, the third relay link is switched to the fourth relay link; wherein, the first relay link and the first Uu The links belong to the same network node or belong to different network nodes; the second relay link and the second Uu link belong to the same network node or belong to different network nodes; the third The relay link and the fourth relay link belong to the same network node or belong to different network nodes.
  • the terminal device 400 further includes a sending module, which may be used to send a completion message for the first message.
  • a sending module which may be used to send a completion message for the first message.
  • the receiving module 402 may be used to receive measurement configuration information; and perform measurement report according to the measurement configuration information.
  • the measurement configuration information is used to instruct the terminal device to measure at least one of the following: the signal quality of the serving cell; the signal quality of potential cells other than the serving cell; and the current serving cell.
  • the measurement configuration information is used to instruct the terminal device to measure the link quality with the potential relay terminal
  • the receiving module 402 may be used to receive data from the potential relay terminal.
  • the broadcast message is used to indicate that the potential relay terminal supports the provision of relay services; and/or the terminal device 400 further includes a sending module, which can be used to send a request message, which is used to request A relay terminal that provides a relay service; the receiving module 402 may be used to receive a response message from the potential relay terminal, where the response message is used to indicate that the potential relay terminal supports the provision of the relay service.
  • the measuring the link quality with the potential relay terminal includes: measuring the link quality with the potential relay terminal according to at least one of the following: The broadcast message; the request message; the response message; the reference signal from the potential relay terminal.
  • the reported potential relay terminals are among the multiple potential relay terminals: the potential relay terminal with the best link quality; A potential relay terminal that provides preset service requirements; a potential relay terminal that has an association relationship with the terminal device.
  • the performing measurement report according to the measurement configuration information includes: performing the report when at least one of the following is satisfied: measurement of the serving cell or the relay terminal currently serving The result is higher than the first threshold; the measurement result of the serving cell or the relay terminal currently serving is lower than the second threshold; the measurement result of the potential relay terminal is higher than the measurement result of the relay terminal currently serving The result plus the offset; the measurement result of the potential cell or the potential relay terminal is higher than the third threshold; the measurement result of the serving cell is lower than the fourth threshold, and the measurement result of the potential relay terminal is high At the fifth threshold; the measurement result of the relay terminal currently serving is lower than the sixth threshold, and the measurement result of the potential relay terminal or the potential cell is higher than the seventh threshold; the potential cell across the RAT Or the measurement result of the potential relay terminal across the RAT is higher than the eighth threshold; the measurement result of the serving cell is lower than the ninth threshold, and the measurement result of the potential relay terminal across the RAT is higher than the tenth threshold
  • the measurement result of the relay terminal currently serving is
  • the receiving module 402 may be configured to receive PDCP reconstruction indication information; according to the PDCP reconstruction indication information, perform operations of security reset and header compression reset.
  • the receiving module 402 may be configured to receive PDCP recovery indication information, and perform data recovery related operations according to the PDCP recovery indication information.
  • the terminal device further includes: a sending module for sending the first status report; and retransmitting the status report according to the received second status report The source link did not transmit a successful data packet.
  • the terminal device may further include a processing module, which may be used to perform at least one of the following: delete the RLC entity configuration; delete the configuration related to the MAC layer and the source link; stop the MAC layer and the source link Road-related timers.
  • a processing module which may be used to perform at least one of the following: delete the RLC entity configuration; delete the configuration related to the MAC layer and the source link; stop the MAC layer and the source link Road-related timers.
  • the terminal device 400 can refer to the process of the method 100 corresponding to the embodiment of the present application, and each unit/module in the terminal device 400 and the other operations and/or functions described above are used to implement the corresponding methods in the method 100.
  • Fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • the network device 500 includes: a sending module 502, which can be used to send a first message, the first message contains switching information; the switching information is used to instruct the terminal device to switch from a source link to a target link At least one of the source link and the target link is a relay link.
  • the network device to which the remote terminal belongs can send handover information, and the remote terminal performs handover according to the handover information, thereby completing the handover process to ensure business continuity and further improve system performance and user experience.
  • the sending module 502 may be used to send a second message, where the second message contains reconfiguration information; the reconfiguration information is used to instruct the relay terminal to perform at least one of the following: The configuration of the link interface is added; the configuration of the secondary link interface is deleted; the reconfiguration of the Uu interface.
  • the sending module 502 may be used to send an access request message to a target relay terminal, where the request message is used to request a terminal device to access the target relay terminal; the network device 500 It may also include a receiving module, which may be used to receive a response message from the target relay terminal, where the response message indicates that the terminal device is allowed to access.
  • the sending module 502 may be used to send a handover request message to the target network device; the handover request message is used to request the terminal device to switch to the target relay terminal, where the target relay terminal is located. In the cell provided by the target network device; or the handover request message is used to request the terminal device to switch to the cell provided by the target network device.
  • the network device 500 may further include a receiving module, which may be used to receive configuration information from the target network device; the configuration information includes at least one of the following: the target network device The Uu configuration of the target network device; the configuration related to the bearer of the target network device; the configuration of the secondary link interface of the target relay terminal; the configuration of the secondary link resource of the target relay terminal.
  • a receiving module which may be used to receive configuration information from the target network device; the configuration information includes at least one of the following: the target network device The Uu configuration of the target network device; the configuration related to the bearer of the target network device; the configuration of the secondary link interface of the target relay terminal; the configuration of the secondary link resource of the target relay terminal.
  • the sending module 502 may be used to send measurement configuration information; the measurement configuration information is used to instruct the terminal device to perform measurement report.
  • the network device 500 can refer to the process of the method 200 corresponding to the embodiment of the present application, and each unit/module in the network device 500 and the other operations and/or functions described above are used to implement the corresponding steps in the method 200.
  • Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 600 includes: a receiving module 602, which can be used to receive a second message from a network device, where the second message contains reconfiguration information; and a configuration update module 604, which can be used to The configuration information performs at least one of the following: the configuration of the secondary link interface is added; the configuration of the secondary link interface is deleted; the Uu interface is reconfigured.
  • the network device to which the remote terminal belongs can send handover information, and the remote terminal performs handover according to the handover information, thereby completing the handover process to ensure business continuity and further improve system performance and user experience.
  • the receiving module 602 may be used to receive an access request message from the network device, where the request message is used to request a terminal device to access; the terminal device 600 may also include sending The module can be used to send a response message indicating that the terminal device is allowed to access.
  • the terminal device 600 may also include a sending module, which may be used to establish an RRC connection of the PC5 interface and a bearer of the PC5 interface with the terminal device; and send the completion message of the second message to the network device.
  • a sending module which may be used to establish an RRC connection of the PC5 interface and a bearer of the PC5 interface with the terminal device; and send the completion message of the second message to the network device.
  • the terminal device 600 may further include a sending module, which may be used to release the RRC connection with the PC5 interface of the terminal device and the bearer of the PC5 interface; and send the completion message of the second message to the network device.
  • a sending module which may be used to release the RRC connection with the PC5 interface of the terminal device and the bearer of the PC5 interface; and send the completion message of the second message to the network device.
  • the network device 600 can refer to the process of the method 300 corresponding to the embodiment of the present application, and each unit/module in the network device 600 and the other operations and/or functions described above are used to implement the corresponding methods in the method 300.
  • Fig. 7 is a block diagram of a terminal device according to another embodiment of the present application.
  • the terminal device 700 shown in FIG. 7 includes: at least one processor 701, a memory 702, at least one network interface 704, and a user interface 703.
  • the various components in the terminal device 700 are coupled together through the bus system 705.
  • the bus system 705 is used to implement connection and communication between these components.
  • the bus system 705 also includes a power bus, a control bus, and a status signal bus.
  • various buses are marked as the bus system 705 in FIG. 7.
  • the user interface 703 may include a display, a keyboard, a pointing device (for example, a mouse, a trackball), a touch panel or a touch screen, etc.
  • the memory 702 in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • Synchronous DRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Double Data Rate SDRAM Double Data Rate SDRAM
  • DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Synchronous Link Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DRRAM Direct Rambus RAM
  • the memory 702 of the system and method described in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.
  • the memory 702 stores the following elements, executable modules or data structures, or a subset of them, or an extended set of them: an operating system 7021 and an application program 7022.
  • the operating system 7021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks.
  • the application program 7022 includes various application programs, such as a media player (Media Player), a browser (Browser), etc., which are used to implement various application services.
  • the program for implementing the method of the embodiment of the present application may be included in the application program 7022.
  • the terminal device 700 further includes: a computer program stored in the memory 702 and capable of running on the processor 701. The computer program is executed by the processor 701 to implement the steps of the following method embodiments 100 and 300.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 701 or implemented by the processor 701.
  • the processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 701 or instructions in the form of software.
  • the aforementioned processor 701 may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a computer readable storage medium mature in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the computer-readable storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and completes the steps of the foregoing method in combination with its hardware.
  • a computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor 701, the steps of the foregoing method embodiments 100 and 300 are implemented.
  • the embodiments described in the embodiments of the present application may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof.
  • the processing unit can be implemented in one or more application specific integrated circuits (ASIC), digital signal processor (Digital Signal Processing, DSP), digital signal processing equipment (DSP Device, DSPD), programmable Logic device (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, and others for performing the functions described in this application Electronic unit or its combination.
  • ASIC application specific integrated circuits
  • DSP Digital Signal Processing
  • DSP Device digital signal processing equipment
  • PLD programmable Logic Device
  • PLD Field-Programmable Gate Array
  • FPGA Field-Programmable Gate Array
  • the technology described in the embodiments of the present application can be implemented by modules (for example, procedures, functions, etc.) that execute the functions described in the embodiments of the present application.
  • the software codes can be stored in the memory and executed by the processor.
  • the memory can be implemented in the processor or external to the processor.
  • the terminal device 700 can implement each process implemented by the terminal device in the foregoing embodiments, and can achieve the same or equivalent technical effects. To avoid repetition, details are not described herein again.
  • FIG. 8 is a structural diagram of a network device applied in an embodiment of the present application, which can implement the details of the method embodiment 200 and achieve the same effect.
  • the network device 800 includes: a processor 801, a transceiver 802, a memory 803, and a bus interface, where:
  • the network device 800 further includes: a computer program stored in the memory 803 and capable of running on the processor 801, and the computer program is executed by the processor 801 to implement the steps of the method embodiment 200.
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 801 and various circuits of the memory represented by the memory 803 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein.
  • the bus interface provides the interface.
  • the transceiver 802 may be a plurality of elements, including a transmitter and a receiver, and provide a unit for communicating with various other devices on a transmission medium.
  • the processor 801 is responsible for managing the bus architecture and general processing, and the memory 803 can store data used by the processor 801 when performing operations.
  • the embodiment of the present application also provides a computer-readable storage medium, and a computer program is stored on the computer-readable storage medium.
  • a computer program is stored on the computer-readable storage medium.
  • the computer-readable storage medium such as read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), magnetic disk, or optical disk, etc.
  • the technical solution of this application essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes several instructions to make a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present application.
  • a terminal which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.

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Abstract

本申请实施例公开了一种sidelink中继架构中的切换方法和设备，用以解决sidelink中继架构中的远程终端无法进行切换，造成的业务中断的问题。该方法由远程终端执行，包括：接收来自于网络设备的第一消息，所述第一消息包含切换信息；根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。

Description

副链路中继架构中的切换方法和设备
交叉引用
本申请要求在2020年03月25日提交中国专利局、申请号为202010219518.X、发明名称为“副链路中继架构中的切换方法和设备”的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，尤其涉及一种副链路(sidelink，或译为侧链路，边链路等)中继架构中的切换和设备。
背景技术
长期演进(Long Term Evolution，LTE)系统从第12个发布版本开始支持sidelink，用于终端设备之间不通过网络设备进行直接数据传输。
随着sidelink的发展，相关技术中提出了sidelink中继(relay)场景。在典型的sidelink中继场景中，远程终端设备(remote UE，或简称远程终端)通过和中继终端设备(relay UE，或简称中继终端)之间的sidelink链路(或称中继链路)，由中继终端将它的数据向网络设备进行转发。在该sidelink中继场景中，远程终端和网络设备之间进行数据传输，中继终端起到数据中转作用。
相关技术中，并没有对sidelink中继架构中远程终端的切换进行设计，缺乏相关的方案，而Uu接口的切换流程无法直接适用于远程终端，导致远程终端无法进行正常切换，造成业务中断，用户体验降低。
发明内容
本申请实施例的目的是提供一种sidelink中继架构中的切换方法和设备，用以解决sidelink中继架构中的远程终端无法进行切换，造成的业务中断的问题。
第一方面，提供了一种副链路中继架构中的切换方法，所述方法由终端 设备执行，所述方法包括：接收来自于网络设备的第一消息，所述第一消息包含切换信息；根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
第二方面，提供了一种副链路中继架构中的切换方法，所述方法由网络设备执行，所述方法包括：发送第一消息，所述第一消息包含切换信息；所述切换信息用于指示终端设备从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
第三方面，提供了一种副链路中继架构中的切换方法，所述方法由中继终端设备执行，所述方法包括：接收来自于网络设备的第二消息，所述第二消息包含重配置信息；基于所述重配置信息执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
第四方面，提供了一种终端设备，包括：接收模块，用于接收来自于网络设备的第一消息，所述第一消息包含切换信息；链路切换模块，用于根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
第五方面，提供了一种网络设备，包括：发送模块，用于发送第一消息，所述第一消息包含切换信息；所述切换信息用于指示终端设备从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
第六方面，提供了一种终端设备，包括：接收模块，用于接收来自于网络设备的第二消息，所述第二消息包含重配置信息；配置更新模块，用于基于所述重配置信息执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
第七方面，提供了一种终端设备，该终端设备包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如第一方面和第三方面中任意一个方面所述的副链路中继架构中的切换方法。
第八方面，提供了一种网络设备，该网络设备包括处理器、存储器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如第二方面所述的副链路中继架构中的切换方法。
第九方面，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上存储计算机程序，所述计算机程序被处理器执行时实现如第一方面、第二方面和第三方面中任意一个方面所述的副链路中继架构中的切换方法。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是根据本申请的一个实施例的副链路中继架构中的切换方法的示意性流程图；
图2是根据本申请的另一个实施例的副链路中继架构中的切换方法的示意性流程图；
图3是根据本申请的再一个实施例的副链路中继架构中的切换方法的示意性流程图；
图4是根据本申请的一个实施例的终端设备的结构示意图；
图5是根据本申请的一个实施例的网络设备的结构示意图；
图6是根据本申请的另一个实施例的终端设备的结构示意图；
图7是根据本申请的再一个实施例的终端设备的结构示意图；
图8是根据本申请的另一个实施例的网络设备的结构示意图。
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，下面将结合本申请具体 实施例及相应的附图对本申请技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。本说明书各个实施例中的“和/或”表示前后两者的至少之一。
应理解，本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)或全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统、5G系统，或者说新无线(New Radio，NR)系统，LTE sidelink系统、NR sidelink系统，或者为后续演进通信系统。
在本申请实施例中，终端设备可以包括但不限于移动台(Mobile Station，MS)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、用户设备(User Equipment，UE)、手机(handset)及便携设备(portable equipment)、车辆(vehicle)等，该终端设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，终端设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等，终端设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
本申请实施例中，网络设备是一种部署在无线接入网中用以为终端设备提供无线通信功能的装置。所述网络设备可以为基站，所述基站可以包括各种形式的宏基站，微基站，中继站，接入点等。在采用不同的无线接入技术的系统中，具有基站功能的设备的名称可能会有所不同。例如在LTE网络中，称为演进的节点B(Evolved NodeB，eNB或eNodeB)，在第三代(3rd Generation，3G)网络中，称为节点B(Node B)，在5G系统中称为下一代节点B(gNB)，或者后续演进通信系统中的网络设备等等，然用词并不构成限制。
以下将首先对本申请实施例的实现思想进行介绍。如前所述，典型的sidelink中继场景中包括远程终端设备(remote UE，或简称远程终端)和中继终端设备(relay UE，或简称中继终端)。对于层二(L2)sidelink中继架构下的远程终端来说，远程终端处于连接态时，其中继终端的服务小区/基站就是自己的服务小区/基站，或者中继终端的主小区(Pcell)可以作为远程终端的服务小区。可选地，远程终端的服务小区，也可能是中继终端服务基站下，不同于中继终端的服务小区的其它小区。
L2 sidelink中继架构的核心是远程终端对应的层三协议层，例如无线资源控制(Radio Resource Control，RRC)层，分组数据聚合协议(Packet Data Convergence Protocol，PDCP)层等，层三协议栈位于网络设备(如基站)侧。远程终端和中继终端之间只有部分层二、层一协议栈，例如，无线链路控制(Radio Link Control，RLC)、媒体接入控制(Medium Access Control，MAC)层、物理(Physical，PHY)层等，进行数据中转，而与远程终端相关的控制功能和安全等功能都位于网络设备侧。
基于上述介绍，服务小区可以控制远程终端进行切换，改变远程终端的路径。为了实现远程终端的切换，如图1所示，本申请的一个实施例提供一种副链路中继架构中的切换方法100，该方法可以由终端设备执行，换言之，该方法可以由安装在终端设备的软件或硬件来执行，该方法包括如下步骤。
S102：接收来自于网络设备的第一消息，该第一消息包含切换信息。
该实施例可以由终端设备来执行：该终端设备可以是直接与网络设备相连，该实施例中，该终端设备由直接与网络设备相连的Uu链路切换到与中继终端相连的中继链路。
该终端设备也可以是远程终端，该例子中，该终端设备由与中继终端相连的中继链路切换到直接与网络设备相连的Uu链路；或者，该终端设备由与中继终端相连的中继链路切换到与另一中继终端相连的中继链路。
该第一消息可以是重配置消息，例如RRCReconfiguration消息。该第一 消息中包括切换信息，例如，该切换信息可以是mobilityinfo等。
S104：根据所述切换信息，从源链路切换到目标链路，源链路和目标链路的至少之一是中继链路。
该实施例中，终端设备可以根据切换信息，从中继链路切换到Uu链路；也可以是从Uu链路切换到中继链路；还可以是从中继链路切换到中继链路。
在一个例子中，终端设备根据切换信息，从第一中继链路切换到第一Uu链路，第一中继链路和第一Uu链路可以归属于同一个网络节点(可以指网络设备、服务小区、服务基站等，后续类同)，也可以归属于不同的网络节点。
在另一个例子中，终端设备根据切换信息，从第二Uu链路切换到第二中继链路，第二中继链路和第二Uu链路可以归属于同一个网络节点，也可以归属于不同的网络节点。
在再一个例子中，终端设备根据切换信息，从第三中继链路切换到第四中继链路，第三中继链路和第四中继链路可以归属于同一个网络节点，也可以归属于不同的网络节点。
可选地，终端设备从源链路切换到目标链路之后，还可以向网络设备发送针对第一消息的完成消息，该完成消息用于表明终端设备切换完成。该实施例中，如果切换后的目标链路是Uu链路，则终端设备直接向目标网络设备发送完成消息；如果切换后的目标链路是中继链路，则终端设备向目标中继终端发送完成消息，由该目标中继终端将完成消息转发给网络设备。
本申请实施例提供的副链路中继架构中的切换方法，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
可选地，终端设备，如远程终端(Remote UE)与它的服务小区/基站建立连接之后，服务小区可以对终端设备进行测量配置，用于终端设备对其周围的小区和/或中继终端进行测量，在满足上报条件的情况下上报测量报告。
在一个例子中，实施例100接收来自于网络设备的第一消息之前，所述 方法还包括：接收测量配置信息；根据所述测量配置信息进行测量上报。
可选地，上述测量配置信息用于指示终端设备测量下述1)至4)中的至少之一：1)当前服务小区的信号质量；2)服务小区之外的潜在小区的信号质量，也即终端设备有可能切换到该潜在小区内，该潜在小区可以是服务小区的邻小区等；3)与当前服务的中继终端之间的链路质量；4)与潜在中继终端之间的链路质量，也即终端设备有可能切换与该潜在中继终端建立中继链路。
可选地，上述测量配置信息用于指示端设备测量上述4)中的与潜在中继终端之间的链路质量，这样，上述根据测量配置信息进行测量上报之前，所述方法还包括如下1)和2)两个步骤的至少之一。
1)接收来自于潜在中继终端的广播消息，该广播消息用于指示所述潜在中继终端支持提供中继服务。
该例子中，潜在中继终端主动发送广播消息，显示自己支持提供对其它UE的中继服务。可选地，该广播消息中还可以包含支持的业务信息，即潜在中继终端可以广播自己能支持中继的业务信息。
2)发送请求消息，所述请求消息用于请求提供中继服务的中继终端；接收来自于所述潜在中继终端的响应消息，所述响应消息用于指示所述潜在中继终端支持提供中继服务。
该例子中，终端设备(远程终端)向周围广播消息，询问哪些中继终端可以为自己提供中继服务，有能力的潜在中继终端可以进行响应，告知远程终端自己支持提供中继服务。可选地，终端设备发送的请求信息中还可以携带业务信息，只有能支持对该(业务信息对应的)业务提供中继服务的潜在中继终端进行响应，
可选地，上述提到的测量与潜在中继终端之间的链路质量包括：根据下述1)至4)中的至少之一，测量与所述潜在中继终端之间的链路质量：1)所述广播消息；2)所述请求消息；3)所述响应消息；4)来自于所述潜在中 继终端的参考信号。
可选地，在潜在中继终端为多个的情况下，终端设备上报的潜在中继终端是多个所述潜在中继终端中：1)链路质量最好的潜在中继终端；或2)能够提供预设的服务要求的潜在中继终端，例如，大带宽、低延迟等服务要求；或3)与所述终端设备建立有关联关系的潜在中继终端，该关联关系例如，用户的可穿戴设备与该用户的手机建立的绑定关系。
可选地，前文各个实施例中提到的根据所述测量配置信息进行测量上报包括：在满足下述1)至9)中的至少之一的情况下进行上报.
1)所述服务小区或当前服务的所述中继终端的测量结果高于第一门限(可以理解，服务小区对应的第一门限和中继终端对应的第一门限可以不同，后续例子类似)。
2)所述服务小区或当前服务的所述中继终端的测量结果低于第二门限。
3)所述潜在中继终端的测量结果高于当前服务的所述中继终端的测量结果加偏移量。
4)所述潜在小区或所述潜在中继终端的测量结果高于第三门限。
5)所述服务小区的测量结果低于第四门限，且所述潜在中继终端的测量结果高于第五门限。
6)当前服务的所述中继终端的测量结果低于第六门限，且所述潜在中继终端或所述潜在小区的测量结果高于第七门限。
7)跨无线接入技术(RAT)的所述潜在小区或跨RAT的所述潜在中继终端的测量结果高于第八门限。
8)所述服务小区的测量结果低于第九门限，且跨RAT的所述潜在中继终端的测量结果高于第十门限。
9)当前服务的所述中继终端的测量结果低于第十一门限，且跨RAT的所述潜在中继终端或跨RAT的所述潜在小区的测量结果高于第十二门限。
需要说明的是，该实施例中提到的第一门限至第十二门限，这些门限可 以均不相同，也可以是部分相同，部分不同。
可选地，实施例100中，终端设备还可以接收PDCP重建指示信息；根据所述PDCP重建指示信息，执行安全复位和头压缩复位的操作。
可选地，实施例100中，终端设备还可以接收PDCP恢复指示信息；根据所述PDCP恢复指示信息，执行数据恢复的相关操作。
在上述两个实施例中，如果确认模式(Acknowledged Mode，AM)配置了状态报告功能，则所述方法还包括：发送第一状态报告；根据接收到的第二状态报告，重新传输在所述源链路没有传输成功的数据包。
可选地，实施例100还包括下述至少之一：删除RLC实体配置；删除MAC层与源链路相关的配置；停掉MAC层与源链路相关的定时器。
为详细说明本申请上述各个实施例提供的副链路中继架构中的切换方法，以下将结合几个具体的实施例进行介绍。
实施例一：测量配置
该实施例中，当一个UE直接连接到服务小区或者通过relay UE连接到服务小区时，服务小区可以根据UE的能力信息(例如，是否支持跨载波的能力)、或者倾向信息(例如，期望节能，更希望连接中继链路等)、或者请求信息(例如，期望节能，更希望连接Uu链路等)，为UE配置与sidelink relay路径切换相关的测量配置。
针对通过relay UE连接到服务小区的remote UE，服务小区通过信令中的信息和/或路径信息明确获知这是一个remote UE，并可以获知与该remote UE对应的relay UE节点，则可选地，可以查询remote UE能力/倾向/请求等之后，为该remote UE配置测量配置，用于下一步切换选择目标节点(可以是网络节点也可以是中继终端)。
针对直接连接到服务小区的UE，服务小区可以查询该UE的能力/倾向/请求等，为它配置测量配置，例如，发送测量配置信息，用于下一步切换选择目标relay节点。
可选地，UE测量配置主要包括如下1)至4)中的至少一种。
1)UE的当前服务小区的信号质量(UE直接连接服务小区，和/或，remote UE通过relay UE中转连接到服务小区)，该信号质量例如参考信号接收功率(RSRP)、参考信号接收功率(RSRQ)等。
该例子中，UE可以被配置为周期上报或者事件触发上报，其中，事件触发可以配置测量的门限，服务小区RSRP低于门限1，或者服务小区RSRP高于门限2，则都可以触发测量报告上报。
2)UE测量其它非服务小区(简称其它潜在小区)的信号质量，例如RSRP、RSRQ等。
该例子中，UE可以被配置为周期上报或者事件触发上报，其中，事件触发可以配置测量的门限，例如，潜在小区的RSRP高于门限1，或者潜在小区RSRP高于本小区的RSRP加偏移量，则都可以触发测量报告上报。
3)remote UE与当前服务的relay UE之间的链路质量测量。
该例子中，remote UE可以被配置为周期上报或者事件触发上报，其中事件触发例如可以配置测量门限，当remote UE与当前relay UE之间的链路质量低于门限，则触发测量上报。
考虑到UE和UE之间的通信和测量不同于普通基站的Uu链路，如果由类似周期性参考信号用于测量，则UE测量该信号能够获得持续稳定的测量结果，但为节约资源降低干扰，UE之间一般不发送周期性参考信号专门用于测量，此时UE和UE之间的测量一般通过数据携带的参考信号进行，当某一个测量周期中UE没有任何数据发送，则测量值进行特殊处理，例如测量值不更新或者采取上一个周期的测量值，或者进行特殊上报，例如周期上报中，这个周期没有测量值，直接上报null。
4)UE测量与其他潜在relay UE之间的链路质量。
该例子中，remote UE可以被配置为事件触发上报，例如，当与其他潜在relay UE之间的链路质量高于门限时上报，或者与其他潜在relay UE之间 的链路质量高于当前服务relay UE质量加偏移量时上报等。
一般来说，UE测量周围潜在relay UE的方法可以如下：
首先，UE需要明确知道对方relay UE是一个具备relay功能并且能为自己提供relay功能的UE。获知信息的方式有两种，一种是relay UE主动发送信息，向周围广播，显示自己可以支持对其它UE的relay服务；另一种是remote UE进行请求的方式，remote UE向周围进行广播，询问谁可以为自己提供relay服务，有能力的relay UE可以进行响应，告知remote UE自己可以提供relay服务。
在确定功能支持之后，接下来可以确定remote UE和对应的relay UE之间的链路满足通信需求，通过上述的应答或者广播过程的信号检测和测量，可以完成remote UE和relay UE之间链路的初步测量，或者remote UE通过持续监听relay UE发送的信号(例如测量参考信号，或者数据参考信号等)，进一步确认链路质量。一般来说remote UE和relay UE之间的链路质量需要满足最低门限要求，在这基础上，remote UE可以在所有满足最低链路质量门限的relay UE中选择合适的，上报给网络设备：1、如果各个relay UE能提供的服务类似，则可以选择链路质量最好的；2、如果remote UE需要的relay服务要求较高，例如大带宽或者低时延等，则可以选择能提供这些服务的relay UE，在满足需求的候选中择其中链路质量最好，或者能力最高的，或者二者均衡折中的；3、remote UE如果有特殊需求，例如与relay UE之间有绑定关系，典型例子是用户的手机和该用户的可穿戴设备之间，一般是共享移动套餐的，有计费和服务上的优势，则可以优先选择进行测量上报。
需要说明的是，上述测量过程中，触发测量报告上报上报的触发条件，关于服务小区、服务relay UE、其它潜在小区、其它潜在relay UE之间的测量报告触发事件中，除了上述举例中提到，还可以包括下述至少之一：服务小区的测量结果高于门限；服务relay UE的测量结果高于门限；服务小区的测量结果低于门限；服务relay UE的测量结果低于门限；其它潜在小区的测 量结果高于服务小区测量结果加偏移量；其它潜在relay UE的测量结果高于服务relay UE测量结果加偏移量；其它潜在小区的测量结果高于门限；其它relay的测量结果高于门限；服务小区的测量结果低于门限1，且其它潜在小区的测量结果高于门限2；服务小区的测量结果低于门限1，且其它潜在relay UE的测量结果高于门限2；服务relay UE的测量结果低于门限1，且其它小区的测量结果高于门限2；服务relay UE的测量结果低于门限1，且其它潜在relay UE的测量结果高于门限2；跨RAT(RADIO ACCESS TECHOLOGY无线接入技术)的其它潜在小区的测量结果高于门限；跨RAT的其它潜在relay UE的测量结果高于门限；服务小区的测量结果低于门限1，且跨RAT的其它潜在小区的测量结果高于门限2；服务小区的测量结果低于门限1，且跨RAT的其它潜在relay UE的测量结果高于门限2；服务relay UE的测量结果低于门限1，且跨RAT的其它潜在小区的测量结果高于门限2；服务relay UE的测量结果低于门限1，且跨RAT的其它潜在relay UE的测量结果高于门限2。
其中，上述提到的跨RAT的其它潜在小区，例如是LTE小区，跨RAT的其它relay UE，例如是LTE V2X UE(仅支持LTE PC5/sidelink接口)。
需要说明的是，上述列举出来的各个门限的值，包括门限1和门限2，这些门限可以均不同，也可以是其中的一些相同，一些不同等等。
另外，一般来自网络设备的测量结果只跟同样来自网络设备的测量结构进行比较，来自relay的测量结果也只跟来自relay UE的测量结果进行比较，二者一般不会直接比较大小，可以各自满足门限要求，或者需要同时满足门限才进行触发。
例如，需要服务小区测量结果低于门限，同时与relay UE之间的测量结果高于门限，这种情况下满足事件触发条件，进行测量报告上报。网络设备接收到这样的测量报告，可以把UE由Uu链路切换到relay链路中。
实施例二：Uu link和共网络设备(基站)的relay link之间的切换
本申请实施例给出最典型的一种L2 sidelink relay架构中切换流程，即UE1<->gNB1链路和remote UE1<->relay UE2<->gNB1链路之间的切换过程。其中，前一个链路中的UE1和后一个链路中的remote UE1是同一个终端设备，只不过在不同的链路中具有不同的名字。
该实施例提供的切换的流程如下。
步骤0：UE1/remote UE1接入gNB1，选择gNB1下的一个小区作为其服务小区cell1，UE1与cell1之间建立RRC连接。
如果UE1是直接与cell1相连，则UE1有可能具有多个服务小区，例如，载波聚合(Carrier Aggregation，CA)情况配置的多个辅小区(secondary，Scell)，此时cell1可以是主小区(primary cell，Pcell)，或者也可以是特别小区(special cell spcell)。
如果是remote UE1，则它是通过relay UE2与cell1建立连接的，即RRC协议栈对等端分别位于remote UE1和cell1，relay UE2只是对数据进行层二中转。一般情况cell1也是relay UE2的服务小区，而且通常是relay UE2的Pcell或者spcell。如果是remote UE1，则因为它是逻辑连接到gNB1，因此可以只连接一个cell1，不需要查看到relay UE2的其它Scell。
步骤1：cell1为UE1配置测量。
该例子中，cell1可以根据UE1的能力/倾向/请求，配置关于服务小区、其它小区、服务relay、其它relay的各种组合测量量。
例如，UE1直接连接cell1，且它希望进行省电，或者自己收发能力有限，或者希望优先支持sidelink relay架构，则测量配置中比较有效的是服务小区低于门限且relay UE高于门限的上报，这种条件满足之后，便于gNB1尽快把UE切换到relay link中去。
例如，UE1是remote UE，根据它是否有绑定的relay关系，网络侧可以配置不同的测量配置，如果remote UE1开放性接入任何relay UE，则测量配置中需要考虑服务relay UE质量，其它潜在relay UE质量，服务小区质量和 其它潜在小区质量等，便于判断remote UE1究竟是选择其它relay链路还是Uu链路；如果remote UE1仅希望接入特定的relay UE2，则测量配置中只需要考虑服务relay质量，服务小区质量其它小区质量等，便于为remote UE1在relay UE2和Uu链路中择优选择。
可选的，如果是remote UE1情况，则测量配置是通过relay UE2中转，先由cell1通过Uu接口发送给relay UE2，再由relay UE2通过sidelink接口发送给remote UE1。
步骤2：UE1满足了测量触发条件，向cell1上报测量结果。
测量的触发一般包括，本节点的链路质量差和/或其它节点的链路质量好。例如，UE1直连到cell1的情况下，上报了cell1链路质量低于门限，relay UE2的链路质量高于门限，则可以把UE1由直连到cell1的路径切换到通过relay UE2连接cell1的路径。反之，remote UE1通过relay UE2连到cell1的情况下，上报了cell1链路质量高于门限，relay UE2的链路质量低于门限，则可以把UE1由通过relay UE2连接cell1的路径切换到直连到cell1的路径。
可选的，在步骤3之前，cell1有可能需要跟relay UE2交互一下，relay UE2是否支持UE1由直接链路切换到relay UE2下的relay路径，获得relay UE2的确认之后，再发送重配置信息/切换命令。当然这个过程也可以省略，由remote UE1和relay UE2在测量阶段彼此确认，只有relay UE2同意接纳remote UE1的情况下，remote UE1才会上报relay UE2相关的测量结果。
步骤3：cell1向UE1发送第一消息。
第一消息可以是重配置消息，其中包含切换信息，例如，新路径指示，和新路径下的配置等。
如果UE1直接连接cell1的情况，则cell1通过第一消息告知UE1切换到relay UE2下，同时携带relay UE2链路相关的配置。由于此时每个数据无线承载(Data Radio Bearer，DRB)和信令无线承载(Signaling Radio Bearer，SRB)的高层部分，即RRC/PDCP依然在cell1，因此这两层相关的一般不需 要重配置(当然也可以重配置一下)，安全操作根据需要决定是否要进行安全更新过程，UE1的RLC/MAC/PHY这几层将直接和relay UE2相连，因此可以重新配置，当然逻辑上也可以在旧配置上进行增量改动。也可以携带UE1在sidelink链路上的一些配置，因为UE1的业务情况cell1比较了解，此时可以直接给UE1配置sidelink链路的资源，例如，资源池或者授权的专用周期资源等。
如果remote UE1通过relay UE2连接到cell1的情况，则cell1通过第一消息告知UE1切换到直接连接cell1的路径，携带新路径配置。同样，层三部分没有改变，PDCP/RRC仍旧锚点在cell1，因此这两层相关的一般不需要重配置(当然也可以重配置一下)，安全操作根据需要决定是否要进行安全更新过程，UE1的RLC/MAC/PHY这几层将直接和cell1相连，因此需要重新配置，当然逻辑上也可以在旧配置上进行增量改动。也可以携带UE1在Uu链路上的一些配置，因为UE1的业务情况cell1比较了解，，此时可以直接给UE1配置Uu链路的资源，例如，授权的专用周期资源等。
可选地，在步骤4之前还可以包括如下步骤：cell1向relay UE2发送第二消息(例如，可以是重配置消息)，其中携带关于remote UE1的路径信息和配置信息等。
如果UE1直接连接cell1的情况，则cell1通过第二消息告知relay UE2关于remote UE1要切换过来，为relay UE2配置sidelink的配置，以便于与remote UE1通信，并为relay UE2配置或者修改Uu接口的配置，以便于承载remote UE1的数据。
如果remote UE1通过relay UE2连接cell1的情况，则cell1通过第二消息，告知relay UE2关于remote UE1要切换走，可以释放与remote UE1之间的sidelink连接，并删除为relay UE2配置或者修改Uu接口的配置，将用于承载remote UE1数据的资源进行释放。
步骤4：UE1接收到cell1的第一消息，接入到新的节点之后，向cell1 发送第一消息的完成消息(例如，切换完成信令)。
如果直接连接cell1的UE1，接收到切换到relay UE2的命令，即第一消息，则发起跟relay UE2建立PC5RRC和承载，并应用相关配置，发送切换完成信令到relay UE2，由它中转给cell1。
如果remote UE1通过relay UE2连接到的cell1，接收到切换到直连cell1的命令，即第一消息，则向cell1发起随机接入过程，应用Uu接口配置，发送切换完成信令到cell1，释放与relay UE2的PC5RRC和承载。
可选地，在步骤5之前还可以包括如下步骤：relay UE2接收到cell1的第二消息，进行链路更改之后，向cell1发送第二消息的完成消息。
如果UE1直接连接cell1，接收到切换到relay UE2的命令，即第二消息，relay UE2跟remote UE1建立PC5RRC和承载，并应用相关sidelink配置和Uu配置，发送第二消息的完成消息(切换完成信令)给cell1，并中转remote UE1的信令和数据。
如果UE1通过relay UE2连接cell1，接收到切换直连的命令，即第二消息，relay UE2断开与remote UE1的sidelink链路，并应用相关Uu配置修改，发送第二消息的完成消息(切换完成信令)给cell1。
步骤5，cell1接收到UE1的切换完成信令(即第一消息的完成消息)，可选地，cell1接收到relay UE2的第二消息的完成消息，整个切换过程结束。
实施例三：relay link和共基站的relay link之间切换
本实施例给出一种remote UE1在relay UE2和relay UE3之间切换的流程，其中relay UE2和relay UE3的服务基站相同，不需要跨基站交互。
该实施例中切换流程如下。
步骤0：remote UE1通过relay UE2先与cell1建立连接，remote UE1的层三协议栈锚点在cell1，通过L2协议栈由relay UE2中转数据。
步骤1：cell1为remote UE1配置测量。
该实施例中，remote UE1是一个开放的UE，或者relay UE2和relay UE3 都属于它的期望连接设备。测量配置信息里可以包含，测量服务relay UE2的链路质量，测量Uu链路质量(本服务小区cell1，和其它小区)，测量其它潜在relay UE(包括relay UE3)的链路质量。
步骤2：触发了测量事件，remote UE1上报测量结果。
可选地，该实施例中的测量事件是：服务relay UE2的链路质量低于门限，和/或潜在relay UE3的链路质量高于门限，或者服务relay UE2的链路质量低于潜在relay UE3的链路质量加偏移等。
可选的，在步骤3之前，cell1还可以跟relay UE3交互，例如，询问relay UE3是否支持UE1由relay UE2切换到relay UE3下的relay路径，在获得relay UE3的确认之后，再发送第一消息。当然这个过程也可以省略，由remote UE1和relay UE3在测量阶段彼此确认，只有relay UE3同意接纳remote UE1的情况下，remote UE1才会上报relay UE3相关的测量结果。
步骤3：cell1向remote UE1发送第一消息，告知remote UE1切换到relay UE3。
第一消息中可以包括承载或者层三的配置更新，一般可以不更新，因为没有变化，指示安全操作是否更新，并携带在新链路的sidelink配置。
可选地，步骤4之前还可以包括如下步骤：cell1向relay UE2发送第二消息(例如，重配置消息)，告知remote UE1要由relay UE2切换出去。
该第二消息中可以包含对relay UE2 Uu接口的重配置，例如删除一些DRB，或者删除一些DRB中映射的数据流，把跟remote UE1传输相关的配置删除掉，同时指示sidelink资源和配置的释放。
可选地，步骤4之前还可以包括如下步骤：cell1向relay UE3发送第二消息，告知remote UE1要切换到relay UE3。
该第二消息中包含对relay UE3 Uu接口的重配置，例如，增加或者修改一些DRB，或者添加一些DRB中映射的数据流，把跟remote UE1传输相关的配置增添进去，同时指示sidelink资源分配和配置。
步骤4：remote UE1接收到第一消息，释放与源relay UE2的PC5 RRC连接，与目标relay UE3建立PC5 RRC，和对应的数据承载配置，之后向cell1发送第一消息的完成消息(切换完成信令)。
可选地，relay UE2接收到第二消息后，释放与remote UE1的PC5 RRC连接，按照新配置执行Uu接口承载变化配置，之后向cell1发送第二消息的完成消息。
可选地，relay UE3接收到第二消息后，建立与remote UE1的PC5 RRC连接和承载，按照新配置执行Uu接口承载配置，之后向cell1发送第二消息的完成消息。
步骤5：cell1接收到remote UE1的完成消息，可选地，接收到relay UE2的完成消息和relay UE3的完成消息，认为切换过程结束。
实施例四：Uu link和跨基站的relay link之间切换
本实施例与实施例二类似，给出Uu link和relay link之间的切换，不同之处在于，实施例二源路径和目标路径都是在相同基站控制下，而本实施例考虑跨基站的场景。
该实施例在介绍时省略了与实施例二类似的部分，重点描述与实施例二的不同点，切换步骤如下。
步骤0：UE1直接接入或者通过relay UE2接入gNB1下的cell1。
步骤1：cell1为UE1配置测量。
该实施例中，为UE1的测量配置中可以包括或者不限制对其它潜在邻小区/邻基站；或者邻小区/邻基站下的relay UE进行测量。
步骤2：UE1触发了测量上报，向cell1上报测量结果。
这些测量结果中，一般是包含了邻基站的小区，或者邻基站下的relay UE。例如位于小区边缘的remote UE1，由于其relay link恶化，比如sidelink链路质量低于门限，而UE1到邻gNB2下的cell2的链路质量高于门限；或者位于小区边缘的直接连接cell1的UE1，其本小区链路质量低于门限，而UE1 到邻小区gNB2的cell2下的relay UE2之间的链路质量高于门限。
步骤3：cell1(gNB1下)决定将UE1切换到邻基站gNB2下，通过基站之间Xn接口(NR基站之间接口)或者X2接口(与LTE基站之间接口)，向邻基站发起切换请求。
切换请求里一般携带UE1在源小区下的配置、业务情况、测量结果等，由gNB1发送给gNB2。
步骤4：接收到gNB1发来的基站间接口消息携带的切换请求信息，gNB2进行接纳决策和配置，向gNB1返回在新链路下的配置信息。
如果UE1希望接入的是gNB2下的cell2，则直接由gNB2做决策。
如果UE1希望接入的是gNB2的cell2下的relay UE2，则在决策之前，可选地，gNB2可以先向relay UE2进行确认，得到许可确认之后再回复切换接纳结果和配置等；或者默认在之前UE1和UE2进行sidelink测量时，已经交互了彼此可以支持relay的信息，UE1能放在测量报告中上报的UE2，说明已经确认UE2的能力和意愿，则此处不需要征询UE2意见，gNB2直接做决策和配置。
该实施例中，gNB2向gNB1返回的配置信息主要包括如下1)和2)之一。1)如果UE1接入到gNB2下的cell2，则主要包括接入Uu的配置，例如相关承载配置和协议层的配置，PDCP/RLC/MAC/PHY等；此时由于是其它基站下的小区为UE服务，则可能存在各种配置的变化。2)如果UE1接入到的gNB2的cell2下的relay UE2，则主要包括承载相关的配置，和sidelink接口的配置和资源等；同时也需要决定给relay UE2的配置，主要包括sidelink接口配置和资源，Uu接口承载增加和更改，用以承载remote UE1的数据。
可选地，步骤5之前还可以包括如下步骤：gNB2下的cell2向relay UE2发送第二消息(如重配置消息)，用于进行与UE1之间的sidelink接口配置和资源配置，Uu接口承载变更等；UE2应用第二消息进行配置之后，向cell2返回第二消息的完成消息。
步骤5：gNB1接收到gNB2返回的切换接纳消息和配置消息，组织成第一消息，由cell1发送给UE1。
步骤6：UE1接收到消息，断开源连接，向新的目标节点进行接入，并应用新的配置，给新的服务小区cell2返回完成消息。
如果是从源relay链路切换到直接接入cell2，则删除和原来relay的sidelink连接，应用新的配置，随机接入过程接入cell2。
如果是从源cell1链路切换到由relay UE2接入cell2，则应用新配置，与relay UE2建立sidelink链路，并通过relay UE2向cell2返回完成消息。
步骤7：cell2接收到UE1的完成消息，可选的，接收到relay UE2的完成消息，认为切换成功，切换完成。
实施例五：relay link和跨基站的relay link之间切换
本实施例给出remote UE1从gNB1下的relay UE2切换到gNB2下的relay UE3的过程。切换过程如下。
步骤0：remote UE1通过relay UE2接入了gNB1下的cell1。
步骤1：cell1为remote UE1配置测量。
测量量可以包含邻小区的各种测量，以及邻小区下relay UE的测量。
步骤2：remote UE1触发了测量事件，向cell1进行测量上报。
该实施例中，可能的测量上报的结果包括，remote UE1到relay UE2的链路质量低于门限，和/或remote UE1到relay UE3的链路质量高于门限，并且relay UE3归属于基站/cell信息。
步骤3：cell1决定将remote UE1由relay UE2切换到邻gNB2下的relay UE3，gNB1向gNB2发送接口消息，承载切换请求信息，包含UE1在源小区配置和业务信息等。
步骤4：gNB2接收到切换请求消息，进行接纳和配置信息生成，并向gNB1返回接纳成功和配置信息。
可选地，gNB2可以向relay UE3进行信令交互，询问是否同意remote UE1 接入，得到确认之后才接纳成功。
可选地，步骤5之前还可以包括如下步骤：cell2向relay UE3发送第二消息(例如，重配置消息)，包含relay UE3和remote UE1的sidelink配置和Uu口配置更新；relay UE3接收第二消息后，向cell2发送第二消息的完成消息。
步骤5：cell1接收到接纳成功和配置信息，组织第一消息并发送给UE1，第一消息主要包括承载配置，sidelink接口配置和资源配置等。
可选地，cell1向relay UE2发送第二消息，释放和修改与remote UE1相关的sidelink配置，和Uu接口配置；relay UE2配置成功，向cell1返回完成消息。
步骤6：UE1接收到第一消息，按照指示进行新配置，释放旧的与relay UE2的sidelink连接，向relay UE3建立新的连接，以及对应的承载和层三配置，并通过relay UE3向cell2发送完成消息。
步骤7：cell2接收到UE1的响应和UE3的完成消息，认为切换完成。
实施例六：remote UE切换引起的PDCP/RLC/MAC处理和数据前转
对于remote UE来说，一旦接收到第一消息，则各层执行如下操作：
PDCP层，应用新配置，如果接收到的是PDCP重建指示，则执行安全复位和头压缩复位，对后续数据均采取复位之后的安全操作和头压缩等，并如果AM配置了状态报告功能则向对端返回状态报告，并根据对端发来的状态报告，重新传输没有成功的数据包，之后开始新数据传输。如果接收到的是PDCP数据恢复指示，则执行数据恢复相应的行为，安全和头压缩继续，如果AM配置了状态报告功能则向对端返回状态报告，并根据对端发来的状态报告，重新传输没有成功的数据包，之后开始新数据传输。
一般情况下，remote UE的服务cell属于不同的gNB，可以指示PDCP重建，用于在不同节点之间保持安全隔离度。而remote UE的服务cell如果没变，或者属于同一个gNB，原则上可以选择PDCP数据恢复，因为此时只 是数据路径发生了变化，PDCP锚点并没有变化，还在cell1/gNB1，安全可以继续，但也可以指示PDCP重建，进行安全更新过程。
RLC层，一旦发生路径切换，RLC实体配置删除，所有未完成的PDU/SDU都删除，应用新的配置，开始重新发送数据。
MAC层删除和停掉与源链路相关的配置和定时器等，重新应用新的配置。
源relay UE，删除与remote UE相关的所有配置、数据等。
新relay UE，为remote建立新的sidelink承载和配置，修改Uu接口配置等。
当UE1发生的是在一个基站下的切换，则数据锚点仍旧在相同的gNB下，不需要数据前转，gNB根据需要进行PDCP重建或者数据恢复指示，对AM支持状态报告的承载，进行数据接收状态反馈和重传过程。
当UE1发生的是从源gNB1到目标gNB2的切换，数据锚点发生了变化，此时需要数据前转和PDCP SN status transfer，gNB1需要把PDCP SN状态发送给gNB2，并根据协商把UE1的上下行数据前转到gNB2，在新的路径进行发送。
以上结合图1详细描述了根据本申请实施例的副链路中继架构中的切换方法。下面将结合图2详细描述根据本申请另一实施例的副链路中继架构中的切换方法。可以理解的是，从网络设备侧描述的网络设备与终端设备的交互与图1所示的方法中的终端设备侧的描述相同，为避免重复，适当省略相关描述。
图2是本申请实施例的副链路中继架构中的切换方法实现流程示意图，可以应用在网络设备侧。如图2所示，该方法200包括：S202：发送第一消息，第一消息包含切换信息；该切换信息用于指示终端设备从源链路切换到目标链路，源链路和目标链路的至少之一是中继链路。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一 步提高系统性能和用户体验。
可选地，作为一个实施例，所述方法还包括：发送第二消息，所述第二消息包含重配置信息；所述重配置信息用于指示中继终端执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
可选地，作为一个实施例，所述发送第一消息之前，所述方法还包括：向目标中继终端发送接入请求消息，所述请求消息用于请求终端设备接入所述目标中继终端；接收来自于所述目标中继终端的响应消息，所述响应消息指示允许所述终端设备接入。
可选地，作为一个实施例，所述方法还包括：向目标网络设备发送切换请求消息；所述切换请求消息用于请求终端设备切换到目标中继终端，所述目标中继终端位于所述目标网络设备提供的小区内；或所述切换请求消息用于请求终端设备切换到所述目标网络设备提供的小区内。
可选地，作为一个实施例，所述方法还包括：接收来自于所述目标网络设备的配置信息；所述配置信息包括如下至少之一：所述目标网络设备的Uu配置；所述目标网络设备的承载相关的配置；所述目标中继终端的副链路接口的配置；所述目标中继终端的副链路资源配置。
可选地，作为一个实施例，所述方法还包括：发送测量配置信息；所述测量配置信息用于指示所述终端设备进行测量上报。
下面将结合图3详细描述根据本申请另一实施例的副链路中继架构中的切换方法。可以理解的是，从中继终端侧的描述与图1所示的方法中的终端设备侧的描述相同，为避免重复，适当省略相关描述。
图3是本申请实施例的副链路中继架构中的切换方法实现流程示意图，可以应用在中继终端侧。如图3所示，该方法300包括如下步骤。
S302：接收来自于网络设备的第二消息，第二消息包含重配置信息。
S304：基于重配置信息执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
可选地，作为一个实施例，所述方法还包括：接收来自于所述网络设备的接入请求消息，所述请求消息用于请求终端设备接入；发送响应消息，所述响应消息指示允许所述终端设备接入。
可选地，作为一个实施例，所述方法还包括：与终端设备建立PC5接口的RRC连接和PC5接口的承载；向网络设备发送所述第二消息的完成消息切换完成信令。
可选地，作为一个实施例，所述方法还包括：释放与终端设备的PC5接口的RRC连接和PC5接口的承载；向网络设备发送所述第二消息的完成消息切换完成信令。
以上结合图1至图3详细描述了根据本申请实施例的副链路中继架构中的切换法。下面将结合图4详细描述根据本申请实施例的终端设备。
图4是根据本申请实施例的终端设备的结构示意图。如图4所示，终端设备400包括：接收模块402，可以用于接收来自于网络设备的第一消息，所述第一消息包含切换信息；链路切换模块404，可以用于根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
可选地，作为一个实施例，链路切换模块404，可以用于根据所述切换信息，从第一中继链路切换到第一Uu链路；或根据所述切换信息，从第二Uu链路切换到第二中继链路；或根据所述切换信息，从第三中继链路切换到第四中继链路；其中，所述第一中继链路和所述第一Uu链路归属于同一个 网络节点或归属于不同的网络节点；所述第二中继链路和所述第二Uu链路归属于同一个网络节点或归属于不同的网络节点；所述第三中继链路和所述第四中继链路归属于同一个网络节点或归属于不同的网络节点。
可选地，作为一个实施例，所述终端设备400还包括发送模块，可以用于发送针对所述第一消息的完成消息。
可选地，作为一个实施例，接收模块402，可以用于接收测量配置信息；根据所述测量配置信息进行测量上报。
可选地，作为一个实施例，所述测量配置信息用于指示所述终端设备测量下述至少之一：服务小区的信号质量；所述服务小区之外的潜在小区的信号质量；与当前服务的中继终端之间的链路质量；与潜在中继终端之间的链路质量。
可选地，作为一个实施例，所述测量配置信息用于指示所述终端设备测量与所述潜在中继终端之间的链路质量，接收模块402，可以用于接收来自于所述潜在中继终端的广播消息，所述广播消息用于指示所述潜在中继终端支持提供中继服务；和/或终端设备400还包括发送模块，可以用于发送请求消息，所述请求消息用于请求提供中继服务的中继终端；接收模块402，可以用于接收来自于所述潜在中继终端的响应消息，所述响应消息用于指示所述潜在中继终端支持提供中继服务。
可选地，作为一个实施例，所述测量与所述潜在中继终端之间的链路质量包括：根据下述至少之一，测量与所述潜在中继终端之间的链路质量：所述广播消息；所述请求消息；所述响应消息；来自于所述潜在中继终端的参考信号。
可选地，作为一个实施例，所述潜在中继终端为多个，其中，上报的潜在中继终端是多个所述潜在中继终端中：链路质量最好的潜在中继终端；能够提供预设的服务要求的潜在中继终端；与所述终端设备建立有关联关系的潜在中继终端。
可选地，作为一个实施例，所述根据所述测量配置信息进行测量上报包括：在满足下述至少之一的情况下进行上报：所述服务小区或当前服务的所述中继终端的测量结果高于第一门限；所述服务小区或当前服务的所述中继终端的测量结果低于第二门限；所述潜在中继终端的测量结果高于当前服务的所述中继终端的测量结果加偏移量；所述潜在小区或所述潜在中继终端的测量结果高于第三门限；所述服务小区的测量结果低于第四门限，且所述潜在中继终端的测量结果高于第五门限；当前服务的所述中继终端的测量结果低于第六门限，且所述潜在中继终端或所述潜在小区的测量结果高于第七门限；跨RAT的所述潜在小区或跨RAT的所述潜在中继终端的测量结果高于第八门限；所述服务小区的测量结果低于第九门限，且跨RAT的所述潜在中继终端的测量结果高于第十门限；当前服务的所述中继终端的测量结果低于第十一门限，且跨RAT的所述潜在中继终端或跨RAT的所述潜在小区的测量结果高于第十二门限。
可选地，作为一个实施例，接收模块402，可以用于接收PDCP重建指示信息；根据所述PDCP重建指示信息，执行安全复位和头压缩复位的操作。
可选地，作为一个实施例，接收模块402，可以用于接收PDCP恢复指示信息，根据所述PDCP恢复指示信息，执行数据恢复的相关操作。
可选地，作为一个实施例，如果确认模式配置了状态报告功能，则所述终端设备还包括：发送模块，用于发送第一状态报告；根据接收到的第二状态报告，重新传输在所述源链路没有传输成功的数据包。
可选地，作为一个实施例，终端设备还可以包括处理模块，可以用于执行下述至少之一：删除RLC实体配置；删除MAC层与源链路相关的配置；停掉MAC层与源链路相关的定时器。
根据本申请实施例的终端设备400可以参照对应本申请实施例的方法100的流程，并且，该终端设备400中的各个单元/模块和上述其他操作和/或功能分别为了实现方法100中的相应流程，并且能够达到相同或等同的技 术效果，为了简洁，在此不再赘述。
图5是根据本申请实施例的网络设备的结构示意图。如图5所述，网络设备500包括：发送模块502，可以用于发送第一消息，所述第一消息包含切换信息；所述切换信息用于指示终端设备从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
可选地，作为一个实施例，发送模块502，可以用于发送第二消息，所述第二消息包含重配置信息；所述重配置信息用于指示中继终端执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
可选地，作为一个实施例，发送模块502，可以用于向目标中继终端发送接入请求消息，所述请求消息用于请求终端设备接入所述目标中继终端；所述网络设备500还可以包括接收模块，可以用于接收来自于所述目标中继终端的响应消息，所述响应消息指示允许所述终端设备接入。
可选地，作为一个实施例，发送模块502，可以用于向目标网络设备发送切换请求消息；所述切换请求消息用于请求终端设备切换到目标中继终端，所述目标中继终端位于所述目标网络设备提供的小区内；或所述切换请求消息用于请求终端设备切换到所述目标网络设备提供的小区内。
可选地，作为一个实施例，所述网络设备500还可以包括接收模块，可以用于接收来自于所述目标网络设备的配置信息；所述配置信息包括如下至少之一：所述目标网络设备的Uu配置；所述目标网络设备的承载相关的配置；所述目标中继终端的副链路接口的配置；所述目标中继终端的副链路资源配置。
可选地，作为一个实施例，发送模块502，可以用于发送测量配置信息；所述测量配置信息用于指示所述终端设备进行测量上报。
根据本申请实施例的网络设备500可以参照对应本申请实施例的方法200的流程，并且，该网络设备500中的各个单元/模块和上述其他操作和/或功能分别为了实现方法200中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
图6是根据本申请实施例的终端设备的结构示意图。如图6所述，终端设备600包括：接收模块602，可以用于接收来自于网络设备的第二消息，所述第二消息包含重配置信息；配置更新模块604，可以用于基于所述重配置信息执行下述至少之一：副链路接口的配置新增；副链路接口的配置删除；Uu接口的重配置。
在本申请实施例中，远程终端归属的网络设备可以发送切换信息，远程终端根据切换信息进行切换，从而完成切换过程，以保障业务连续性，进一步提高系统性能和用户体验。
可选地，作为一个实施例，接收模块602，可以用于接收来自于所述网络设备的接入请求消息，所述请求消息用于请求终端设备接入；所述终端设备600还可以包括发送模块，可以用于发送响应消息，所述响应消息指示允许所述终端设备接入。
所述终端设备600还可以包括发送模块，可以用于与终端设备建立PC5接口的RRC连接和PC5接口的承载；向网络设备发送所述第二消息的完成消息。
所述终端设备600还可以包括发送模块，可以用于释放与终端设备的PC5接口的RRC连接和PC5接口的承载；向网络设备发送所述第二消息的完成消息。
根据本申请实施例的网络设备600可以参照对应本申请实施例的方法300的流程，并且，该网络设备600中的各个单元/模块和上述其他操作和/或功能分别为了实现方法300中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
本说明书中的各个实施例采用递进的方式描述，每个实施例重点说明的通常是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于设备实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
图7是本申请另一个实施例的终端设备的框图。图7所示的终端设备700包括：至少一个处理器701、存储器702、至少一个网络接口704和用户接口703。终端设备700中的各个组件通过总线系统705耦合在一起。可理解，总线系统705用于实现这些组件之间的连接通信。总线系统705除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图7中将各种总线都标为总线系统705。
其中，用户接口703可以包括显示器、键盘、点击设备(例如，鼠标，轨迹球(trackball))、触感板或者触摸屏等。
可以理解，本申请实施例中的存储器702可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDRSDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM， ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DRRAM)。本申请实施例描述的系统和方法的存储器702旨在包括但不限于这些和任意其它适合类型的存储器。
在一些实施方式中，存储器702存储了如下的元素，可执行模块或者数据结构，或者他们的子集，或者他们的扩展集：操作系统7021和应用程序7022。
其中，操作系统7021，包含各种系统程序，例如框架层、核心库层、驱动层等，用于实现各种基础业务以及处理基于硬件的任务。应用程序7022，包含各种应用程序，例如媒体播放器(Media Player)、浏览器(Browser)等，用于实现各种应用业务。实现本申请实施例方法的程序可以包含在应用程序7022中。
在本申请实施例中，终端设备700还包括：存储在存储器上702并可在处理器701上运行的计算机程序，计算机程序被处理器701执行时实现如下方法实施例100和300的步骤。
上述本申请实施例揭示的方法可以应用于处理器701中，或者由处理器701实现。处理器701可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器701中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器701可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。 通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的计算机可读存储介质中。该计算机可读存储介质位于存储器702，处理器701读取存储器702中的信息，结合其硬件完成上述方法的步骤。具体地，该计算机可读存储介质上存储有计算机程序，计算机程序被处理器701执行时实现如上述方法实施例100和300的各步骤。
可以理解的是，本申请实施例描述的这些实施例可以用硬件、软件、固件、中间件、微码或其组合来实现。对于硬件实现，处理单元可以实现在一个或多个专用集成电路(Application Specific Integrated Circuits，ASIC)、数字信号处理器(Digital Signal Processing，DSP)、数字信号处理设备(DSP Device，DSPD)、可编程逻辑设备(Programmable Logic Device，PLD)、现场可编程门阵列(Field-Programmable Gate Array，FPGA)、通用处理器、控制器、微控制器、微处理器、用于执行本申请所述功能的其它电子单元或其组合中。
对于软件实现，可通过执行本申请实施例所述功能的模块(例如过程、函数等)来实现本申请实施例所述的技术。软件代码可存储在存储器中并通过处理器执行。存储器可以在处理器中或在处理器外部实现。
终端设备700能够实现前述实施例中终端设备实现的各个过程，并且能够达到相同或等同的技术效果，为避免重复，这里不再赘述。
请参阅图8，图8是本申请实施例应用的网络设备的结构图，能够实现方法实施例200的细节，并达到相同的效果。如图8所示，网络设备800包 括：处理器801、收发机802、存储器803和总线接口，其中：
在本申请实施例中，网络设备800还包括：存储在存储器上803并可在处理器801上运行的计算机程序，计算机程序被处理器801、执行时实现方法实施例200的步骤。
在图8中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器801代表的一个或多个处理器和存储器803代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机802可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。
处理器801负责管理总线架构和通常的处理，存储器803可以存储处理器801在执行操作时所使用的数据。
本申请实施例还提供一种计算机可读存储介质，计算机可读存储介质上存储有计算机程序，该计算机程序被处理器执行时实现上述方法实施例100、200和300中任意一个方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。其中，所述的计算机可读存储介质，如只读存储器(Read-Only Memory，简称ROM)、随机存取存储器(Random Access Memory，简称RAM)、磁碟或者光盘等。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (29)

  1. 一种副链路中继架构中的切换方法，所述方法由终端设备执行，所述方法包括：
    接收来自于网络设备的第一消息，所述第一消息包含切换信息；
    根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
  2. 根据权利要求1所述的方法，其中，所述根据所述切换信息，从源链路切换到目标链路包括：
    根据所述切换信息，从第一中继链路切换到第一Uu链路；或
    根据所述切换信息，从第二Uu链路切换到第二中继链路；或
    根据所述切换信息，从第三中继链路切换到第四中继链路；
    其中，所述第一中继链路和所述第一Uu链路归属于同一个网络节点或归属于不同的网络节点；所述第二中继链路和所述第二Uu链路归属于同一个网络节点或归属于不同的网络节点；所述第三中继链路和所述第四中继链路归属于同一个网络节点或归属于不同的网络节点。
  3. 根据权利要求1所述的方法，其中，所述从源链路切换到目标链路之后，所述方法还包括：
    发送针对所述第一消息的完成消息。
  4. 根据权利要求1所述的方法，其中，所述接收来自于网络设备的第一消息之前，所述方法还包括：
    接收测量配置信息；
    根据所述测量配置信息进行测量上报。
  5. 根据权利要求4所述的方法，其中，所述测量配置信息用于指示所述终端设备测量下述至少之一：
    服务小区的信号质量；
    所述服务小区之外的潜在小区的信号质量；
    与当前服务的中继终端之间的链路质量；
    与潜在中继终端之间的链路质量。
  6. 根据权利要求5所述的方法，其中，所述测量配置信息用于指示所述终端设备测量与所述潜在中继终端之间的链路质量，所述根据所述测量配置信息进行测量上报之前，所述方法还包括：
    接收来自于所述潜在中继终端的广播消息，所述广播消息用于指示所述潜在中继终端支持提供中继服务；和/或
    发送请求消息，所述请求消息用于请求提供中继服务的中继终端；接收来自于所述潜在中继终端的响应消息，所述响应消息用于指示所述潜在中继终端支持提供中继服务。
  7. 根据权利要求6所述的方法，其中，所述测量与所述潜在中继终端之间的链路质量包括：根据下述至少之一，测量与所述潜在中继终端之间的链路质量：
    所述广播消息；
    所述请求消息；
    所述响应消息；
    来自于所述潜在中继终端的参考信号。
  8. 根据权利要求6所述的方法，其中，所述潜在中继终端为多个，其中，上报的潜在中继终端是多个所述潜在中继终端中：
    链路质量最好的潜在中继终端；
    能够提供预设的服务要求的潜在中继终端；
    与所述终端设备建立有关联关系的潜在中继终端。
  9. 根据权利要求5所述的方法，其中，所述根据所述测量配置信息进行测量上报包括：在满足下述至少之一的情况下进行上报：
    所述服务小区或当前服务的所述中继终端的测量结果高于第一门限；
    所述服务小区或当前服务的所述中继终端的测量结果低于第二门限；
    所述潜在中继终端的测量结果高于当前服务的所述中继终端的测量结果加偏移量；
    所述潜在小区或所述潜在中继终端的测量结果高于第三门限；
    所述服务小区的测量结果低于第四门限，且所述潜在中继终端的测量结果高于第五门限；
    当前服务的所述中继终端的测量结果低于第六门限，且所述潜在中继终端或所述潜在小区的测量结果高于第七门限；
    跨无线接入技术RAT的所述潜在小区或跨RAT的所述潜在中继终端的测量结果高于第八门限；
    所述服务小区的测量结果低于第九门限，且跨RAT的所述潜在中继终端的测量结果高于第十门限；
    当前服务的所述中继终端的测量结果低于第十一门限，且跨RAT的所述潜在中继终端或跨RAT的所述潜在小区的测量结果高于第十二门限。
  10. 根据权利要求1所述的方法，其中，所述方法还包括：
    接收分组数据聚合协议PDCP重建指示信息；
    根据所述PDCP重建指示信息，执行安全复位和头压缩复位的操作。
  11. 根据权利要求1所述的方法，其中，所述方法还包括：
    接收PDCP恢复指示信息；
    根据所述PDCP恢复指示信息，执行数据恢复的相关操作。
  12. 根据权利要求10或11所述的方法，其中，如果确认模式AM配置了状态报告功能，则所述方法还包括：
    发送第一状态报告；
    根据接收到的第二状态报告，重新传输在所述源链路没有传输成功的数据包。
  13. 根据权利要求1所述的方法，其中，所述方法还包括下述至少之一：
    删除无线链路控制RLC实体配置；
    删除媒体接入控制MAC层与所述源链路相关的配置；
    停掉MAC层与所述源链路相关的定时器。
  14. 一种副链路中继架构中的切换方法，所述方法由网络设备执行，所述方法包括：
    发送第一消息，所述第一消息包含切换信息；
    所述切换信息用于指示终端设备从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
  15. 根据权利要求14所述的方法，其中，所述方法还包括：
    发送第二消息，所述第二消息包含重配置信息；
    所述重配置信息用于指示中继终端执行下述至少之一：
    副链路接口的配置新增；
    副链路接口的配置删除；
    Uu接口的重配置。
  16. 根据权利要求14所述的方法，其中，所述发送第一消息之前，所述方法还包括：
    向目标中继终端发送接入请求消息，所述请求消息用于请求终端设备接入所述目标中继终端；
    接收来自于所述目标中继终端的响应消息，所述响应消息指示允许所述终端设备接入。
  17. 根据权利要求14所述的方法，其中，所述方法还包括：
    向目标网络设备发送切换请求消息；
    所述切换请求消息用于请求终端设备切换到目标中继终端，所述目标中继终端位于所述目标网络设备提供的小区内；或
    所述切换请求消息用于请求终端设备切换到所述目标网络设备提供的小区内。
  18. 根据权利要求17所述的方法，其中，所述方法还包括：
    接收来自于所述目标网络设备的配置信息；
    所述配置信息包括如下至少之一：
    所述目标网络设备的Uu配置；
    所述目标网络设备的承载相关的配置；
    所述目标中继终端的副链路接口的配置；
    所述目标中继终端的副链路资源配置。
  19. 根据权利要求14所述的方法，其中，所述方法还包括：
    发送测量配置信息；所述测量配置信息用于指示所述终端设备进行测量上报。
  20. 一种副链路中继架构中的切换方法，所述方法由中继终端设备执行，所述方法包括：
    接收来自于网络设备的第二消息，所述第二消息包含重配置信息；
    基于所述重配置信息执行下述至少之一：
    副链路接口的配置新增；
    副链路接口的配置删除；
    Uu接口的重配置。
  21. 根据权利要求20所述的方法，其中，所述方法还包括：
    接收来自于所述网络设备的接入请求消息，所述请求消息用于请求终端设备接入；
    发送响应消息，所述响应消息指示允许所述终端设备接入。
  22. 根据权利要求20所述的方法，其中，所述方法还包括：
    与终端设备建立PC5接口的RRC连接和PC5接口的承载；
    向网络设备发送所述第二消息的完成消息。
  23. 根据权利要求20所述的方法，其中，所述方法还包括：
    释放与终端设备的PC5接口的RRC连接和PC5接口的承载；
    向网络设备发送所述第二消息的完成消息。
  24. 一种终端设备，包括：
    接收模块，用于接收来自于网络设备的第一消息，所述第一消息包含切换信息；
    链路切换模块，用于根据所述切换信息，从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
  25. 一种网络设备，包括：
    发送模块，用于发送第一消息，所述第一消息包含切换信息；
    所述切换信息用于指示终端设备从源链路切换到目标链路，所述源链路和所述目标链路的至少之一是中继链路。
  26. 一种终端设备，包括：
    接收模块，用于接收来自于网络设备的第二消息，所述第二消息包含重配置信息；
    配置更新模块，用于基于所述重配置信息执行下述至少之一：
    副链路接口的配置新增；
    副链路接口的配置删除；
    Uu接口的重配置。
  27. 一种终端设备，包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如权利要求1至13、20至23中任一项所述的副链路中继架构中的切换方法。
  28. 一种网络设备，包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如权利要求14至19中任一项所述的副链路中继架构中的切换方法。
  29. 一种计算机可读存储介质，所述计算机可读存储介质上存储有计算机程序，所述计算机程序被处理器执行时实现如权利要求1至23中任一项所述的副链路中继架构中的切换方法。
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