WO2021159823A1 - 链路切换、链路切换配置方法、装置、通信节点及介质 - Google Patents

链路切换、链路切换配置方法、装置、通信节点及介质 Download PDF

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Publication number
WO2021159823A1
WO2021159823A1 PCT/CN2020/133342 CN2020133342W WO2021159823A1 WO 2021159823 A1 WO2021159823 A1 WO 2021159823A1 CN 2020133342 W CN2020133342 W CN 2020133342W WO 2021159823 A1 WO2021159823 A1 WO 2021159823A1
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Prior art keywords
link
relay device
switching
data packet
base station
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PCT/CN2020/133342
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English (en)
French (fr)
Inventor
汪梦珍
陈琳
张博源
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to KR1020227029914A priority Critical patent/KR20220133981A/ko
Priority to JP2022548790A priority patent/JP7433455B2/ja
Priority to US17/904,033 priority patent/US20230074899A1/en
Priority to CA3167800A priority patent/CA3167800A1/en
Priority to EP20918773.1A priority patent/EP4106399A4/en
Publication of WO2021159823A1 publication Critical patent/WO2021159823A1/zh

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    • 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
    • H04W40/00—Communication routing or communication path finding
    • H04W40/34—Modification of an existing route
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • 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
    • H04W36/0005—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
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • 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
    • H04W40/00—Communication routing or communication path finding
    • H04W40/34—Modification of an existing route
    • H04W40/36—Modification of an existing route due to handover
    • 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
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to a wireless communication network, for example, to a link switching, link switching configuration method, device, communication node, and medium.
  • This application provides a link switching and link switching configuration method, device, communication node, and medium to improve the flexibility and reliability of wireless communication.
  • the embodiment of the application provides a link switching method, which is applied to a first terminal (User Equipment, UE), including:
  • the embodiment of the present application also provides a link switching configuration method, which is applied to a base station, and includes:
  • An embodiment of the present application also provides a link switching device, including:
  • the configuration information receiving module is set to receive link switching configuration information
  • the link switching module is configured to switch from the first link communicating with the target node to the second link according to the link switching configuration information.
  • the application embodiment also provides a link switching configuration device, including:
  • a configuration information sending module configured to send link switching configuration information to the first terminal
  • the data transmission module is configured to transmit data with the first terminal.
  • the embodiment of the present application also provides a communication node, including:
  • One or more processors are One or more processors;
  • Storage device for storing one or more programs
  • the one or more processors When the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned link switching method or link switching configuration method.
  • 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, and when the program is executed by a processor, the above-mentioned link switching method or link switching configuration method is implemented.
  • Figure 1 is a schematic diagram of a communication link in a wireless communication system
  • FIG. 2 is a flowchart of a link switching method provided by an embodiment
  • FIG. 3 is a schematic diagram of uplink data packet transmission provided by an embodiment
  • FIG. 4 is a schematic diagram of downlink data packet transmission provided by an embodiment
  • FIG. 5 is a schematic diagram of the implementation of link switching provided by an embodiment
  • FIG. 6 is a schematic diagram of a communication link between a handover and a terminal provided by an embodiment
  • FIG. 7 is a schematic diagram of the implementation of link switching provided by another embodiment
  • FIG. 8 is a schematic diagram of the implementation of link switching provided by another embodiment
  • FIG. 9 is a flowchart of a link switching configuration method provided by an embodiment
  • FIG. 10 is a schematic structural diagram of a link switching device provided by an embodiment
  • FIG. 11 is a schematic structural diagram of a link switching configuration device provided by an embodiment
  • FIG. 12 is a schematic diagram of the hardware structure of a communication node provided by an embodiment.
  • the traditional base station-centric cellular network has obvious limitations in terms of high data rate and proximity service support. Under this demand, it is based on Device-to-Device (D2D)
  • D2D Device-to-Device
  • the new communication technology came into being.
  • the UE can also realize data transmission with the target node through bypass-based relay equipment, thereby supporting a wider range of applications and services, expanding coverage and Improve power consumption, improve the robustness of network infrastructure, and meet the requirements of high data rate services and proximity services.
  • the D2D technology is also called Proximity Services (ProSe), unilateral/sidelink/Sidelink (SL) communication; the interface between the device and the device is the direct link PC5 interface.
  • ProSe Proximity Services
  • SL sidelink/Sidelink
  • Fig. 1 is a schematic diagram of a communication link in a wireless communication system.
  • Sidelink relay communication has two main application scenarios: 1) Relay transmission between UE and base station, and UE relay transmission in weak/no coverage area, as shown in mode 1 in Figure 1, allowing UE1 with poor signal quality or without coverage communicates with the network through UE2 with network coverage nearby, which helps operators expand coverage and increase capacity.
  • UE2 is a relay device, that is, UE-to-Network relay; 2) UE Relay transmission with UE: For example, in the event of an earthquake or emergency, the cellular network cannot work normally, or in order to expand the Sidelink communication range, allowing devices to communicate through the relay UE, as shown in mode 2 in Figure 1 , UE3 and UE4 perform data communication through UE5 or a multi-hop relay UE, where UE5 is a relay device, that is, UE-to-UE relay.
  • LTE Long-term evolution
  • IP layer the relay transmission of layer 3
  • access layer the relay transmission of layer 2
  • NR New Radio
  • LTE sidelink communication mechanisms such as frame structure, QoS processing, bearer configuration and establishment, etc.
  • the technical solution of LTE-based Sidelink relay transmission is not suitable for 5G or NR system.
  • a link switching method is provided.
  • the first terminal ie, remote device
  • Fig. 2 is a flowchart of a link switching method provided by an embodiment.
  • the method in this embodiment can be applied to the first terminal (denoted as UE1).
  • the method provided in this embodiment includes step 110 and step 120.
  • step 110 link switching configuration information is received.
  • step 120 the first link communicating with the target node is switched to the second link according to the link switching configuration information.
  • link switching includes the following situations:
  • Case 1 Switch from direct communication with the target node (Direct Uu Link) to relay communication based on the PC5 or SL interface.
  • UE1 is in the Radio Resource Control (RRC) connection state, and directly communicates with the target node through the first link before handover; when the Uu channel quality deteriorates, UE1 determines the relay device and switches to In the second link, data is forwarded to the target node through the relay device in the second link, where the base station of the UE1 and the base station of the relay device may be the same base station or different base stations.
  • RRC Radio Resource Control
  • Case 2 Switch from relay communication based on the PC5 or SL interface to direct communication with the target node:
  • UE1 communicates with the network through the relay device; when UE1 enters the coverage of the base station and establishes an RRC connection, The service forwarded by the relay device can be switched to the Uu link and directly transmitted to the base station, where the base station of UE1 and the base station of the relay device may be the same base station or different base stations.
  • Case 3 Handover between relay communication links: In this case, a reselection of the relay device occurs, and the relay device connected to UE1 changes. For example, before the handover, UE1 communicates with the base station through the first relay device, after the handover, UE1 communicates with the base station through the second relay device, and the service forwarded by the first relay device is switched to the link forwarded by the second relay device.
  • the base stations corresponding to the first relay device and the second relay device may be the same base station or different base stations.
  • the UE1 when the signal quality of the current link is poor or the coverage of the base station changes, the UE1 can realize the handover of the direct link or the relay communication link, or the reselection of the relay device, effectively passing the relay
  • the equipment realizes data forwarding and improves the flexibility and reliability of the communication link.
  • the link switching configuration information includes at least one of link switching criteria and switching indication information.
  • the target node sends a link switching criterion to UE1, and UE1 decides whether to perform link switching according to the link switching criterion, or the target node sends switching indication information to UE1 to instruct UE1 to perform link switching.
  • the link switching configuration information is configured by the target node, or pre-configured by the system or defined by the protocol.
  • the switching from the first link communicating with the target node to the second link according to the link switching configuration information includes at least one of the following: notifying when the link switching criterion is met The target node, and switch from the first link to the second link according to the switching instruction information configured by the target node; switch from the first link to the second link according to the switching instruction information configured by the target node; when the link switching criterion is met In the case of switching from the first link to the second link
  • the target node can configure the link handover criterion and send it to UE1.
  • the target node When UE1 detects that the link handover criterion is met, the target node is notified, and the target node decides and sends the handover indication information, thereby instructing UE1 whether to proceed with the link.
  • Handover or, UE1 measures the channel quality, service type, etc. according to the measurement configuration configured by the target node and reports it to the target node, and the target node decides and sends handover indication information to instruct UE1 whether to perform link handover; or, by the target Node configuration or pre-configured link switching criteria, UE1 autonomously performs handover when UE1 detects that the link switching criteria are met.
  • the handover indication information includes at least one of the following: handover indication; relay device identifier; handover service type; handover protocol data unit (PDU) session identifier; handover data radio bearer (Data Radio Bearer (DRB); Handover Quality of Service (QoS) flow information; DRB Packet Data Convergence Protocol (PDCP) retransmission instructions.
  • handover indication includes at least one of the following: handover indication; relay device identifier; handover service type; handover protocol data unit (PDU) session identifier; handover data radio bearer (Data Radio Bearer (DRB); Handover Quality of Service (QoS) flow information; DRB Packet Data Convergence Protocol (PDCP) retransmission instructions.
  • PDU handover protocol data unit
  • DRB Handover Quality of Service
  • QoS Handover Quality of Service
  • PDCP DRB Packet Data Convergence Protocol
  • the first link is a link that directly communicates with the target node
  • the second link is a link that communicates with the target node through a relay device
  • the target node is a base station
  • the handover criterion includes at least one of the following: the first link quality threshold of the first link; the first preset service type; the PC5 interface link quality threshold of the second link.
  • the link switching criterion is satisfied when at least one of the following is satisfied: the link quality of the first link is lower than the first threshold of link quality; the first link The service type of the road is the first preset service type; the PC5 interface link quality of the second link is higher than the PC5 interface link quality threshold of the second link.
  • the link quality of the first link (Uu link) is lower than the first link quality threshold of the first link (for Uu interface link)
  • the first threshold of link quality may include a certain hysteresis value
  • the service type on the first link is the first preset service type (for example, some types of service data need to pass through the PC5 interface Transmission)
  • the link quality of the second link (PC5 link) is higher than the PC5 interface link quality threshold of the second link
  • you can switch to the second link For the link, for example, if the link quality of the PC5 interface between the UE1 and the relay UE is higher than the link quality threshold of the PC5 interface of the second link, the link switching can be performed. In this process, UE1 can measure the first link and the second link separately.
  • the first link is a link that communicates with the target node through a relay device
  • the second link is a link that directly communicates with the target node
  • the target node is Base station.
  • the link switching criterion includes at least one of the following: the second link quality threshold of the second link; the PC5 interface link quality threshold of the first link; the link between the relay device and the base station The third quality threshold; the first channel busy and idle rate threshold; the second channel busy and idle rate threshold.
  • the link switching criterion is satisfied when at least one of the following is satisfied: the link quality of the second link is higher than the second threshold of link quality; the first link The link quality of the PC5 interface of the first link is lower than the link quality threshold of the PC5 interface of the first link; the link quality between the relay device and the base station is lower than the third threshold of link quality; The channel busy/idle rate of any resource pool of the PC5 interface of the first link is higher than the first channel busy/idle rate threshold; the average value of the channel busy/idle rate of all resource pools of the PC5 interface of the first link is higher than the said The second channel busy/idle rate threshold.
  • the second threshold of link quality may include a certain hysteresis value; the link quality of the PC5 interface on the first link (Uu link) is lower than the link quality threshold of the PC5 interface of the first link (for example, UE1 and the relay device If the link quality of the PC5 interface is lower than the PC5 interface link quality threshold of the first link), it can be switched to the second link; the link quality between the relay device and the base station is lower than the link quality.
  • the third threshold of channel quality it can switch to the second link.
  • the relay device informs UE1 of the link quality between it and the base station through PC5 RRC signaling messages, or communicates the link quality between it and the base station.
  • the link quality level indicator (for example, the indicator higher or lower than the third threshold of link quality, the indicator of good quality, medium, bad, etc.) informs UE1; the channel busy and idle rate of the PC5 interface resource pool on the first link (Channel If the Busy Rate, CBR is higher than the first channel's busy/idle rate threshold, it can be switched to the second link; when the average value of CBR in all resource pools on the PC5 interface of the first link is higher than the second channel's busy/idle rate threshold
  • the second link can be switched to, for example, the PC5 interface resource pool CBR of the first link or the average value of CBR of all resource pools is higher than the threshold, indicating that the relay transmission load is getting heavier and can be switched to directly communicate with the base station;
  • the service type on the first link is the second preset service type (for
  • the link quality of the Uu link is the measured reference signal receiving power (RSRP) or the reference signal receiving quality (RSRQ) of the Uu interface, and the PC5 link quality is measured
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • RSSI Received Signal Strength Indication
  • the method further includes: transmitting, through the second link, the first data packet that the relay device has not confirmed to receive and the data packets after the first data packet.
  • the relay protocol stack is end-to-end PDCP and hop-by-hop radio link control (radio link conrtol, RLC).
  • Fig. 3 is a schematic diagram of uplink data packet transmission provided by an embodiment. Take the above packet transmission as an example. As shown in Figure 3, UE1 has delivered packets 1, 2, 3, 4 to the PC5 interface for transmission to the relay device (relay 1), and the PC5 interface is in RLC confirmation mode (AM Mode) transmission, and UE1 receives the packet 1, 2, 4 confirmation reception indication and the packet 3 not received indication sent by the relay device.
  • relay device relay 1
  • RLC confirmation mode AM Mode
  • UE1 performs PDCP data discovery (Data Recovery ), the first packet (packet 3) that the relay device has not confirmed to receive is delivered to the Uu interface and directly transmitted to the base station (NW); the relay device will continue to send packets 1, 2, 4 to the base station, and the base station receives To packets 1, 2, 4 forwarded by the relay device and packets 3, 4, 5, 6... sent by UE1 through the Uu interface, perform duplicate packet detection, discard duplicate packets (packet 4), and perform PDCP reordering, Thus, the data packets are delivered to the upper layer in order.
  • Data Recovery the first packet (packet 3) that the relay device has not confirmed to receive is delivered to the Uu interface and directly transmitted to the base station (NW); the relay device will continue to send packets 1, 2, 4 to the base station, and the base station receives To packets 1, 2, 4 forwarded by the relay device and packets 3, 4, 5, 6... sent by UE1 through the Uu interface, perform duplicate packet detection, discard duplicate packets (packet 4),
  • the method further includes: receiving a first PDCP status report sent by the base station; according to the first PDCP status report, retransmitting the information indicated in the first PDCP status report through the second link Successfully received data packets and/or transmission of newly transmitted data.
  • the unsuccessfully received data packets are indicated by the first PDCP status report, and these data packets are retransmitted to avoid packet loss. If there are no unsuccessfully received data packets in the first PDCP status report, the transmission can be continued. New ship data.
  • the method further includes: receiving first indication information of the relay device, where the first indication information includes at least one of the following: Radio Link Failure (RLF) indication information; first target data packet The sequence number of; according to the first indication information, the first target data packet is transmitted through the second link; wherein, the first target data packet includes a data packet that the relay device has not forwarded to the base station And/or the base station has not confirmed the received data packet.
  • RLF Radio Link Failure
  • the relay device does not confirm the receipt of the data packet, and the subsequent data packets are transmitted through the second link.
  • the relay device sends the packet 1 After being sent to the base station, the Uu link quality between the relay device and the base station suddenly deteriorates or RLF occurs, and packets 2, 4 are still buffered in the relay device and not sent to the base station (as shown in Figure 3), because UE1 is Starting from packet 3, it is delivered to the Uu interface for transmission, then there will be packet loss, and the base station cannot receive packet 2.
  • this embodiment adopts the following method to ensure lossless transmission between UE1 and the base station during link handover:
  • Method 1 The relay device initiates RRC connection re-establishment to the base station, and continues to send the packet 2 to the base station after the re-establishment is successful.
  • the RRC re-establishment has a large delay or the re-establishment may fail.
  • Method 2 When UE1 instructs the base station for link switching or base station decision and instructs UE1 for link switching, the base station sends the first PDCP status report for uplink data to UE1 through the Uu interface, and UE1 responds to the first PDCP status report indicated in the report Data packets that have not been confirmed to be received are retransmitted, and the data packets that have been confirmed to be received do not need to be sent repeatedly, and new data can be transmitted continuously.
  • the base station may initiate the release of the RRC connection with the relay device after sending the first PDCP status report, or instruct the relay device to no longer forward the data packet of UE1.
  • Method 3 When the relay device detects RLF on the Uu interface with the base station, the relay device sends instructions to UE1 through the PC5 RRC message, and informs the relay device that it has not been forwarded to the base station and or has been forwarded but not received yet The sequence number of the data packet sent by the base station confirming the receipt of the feedback indication is sent to the UE1.
  • the indication information of the PC5 RRC message sent by the relay device to the UE1 includes at least one of the following: RLF indication; the sequence number (PDCP SN) of the data packet that has not been forwarded to the base station, for example, may be the smallest PDCP in ascending order SN or COUNT value; the PDCP SN of the data packet that has been forwarded but not yet received from the base station to confirm receipt of the feedback indication. For example, it can be the smallest PDCP SN or COUNT value in ascending order. In this case, the relay device can recognize PDCP PDCP SN in the packet header.
  • the method further includes: sending a second PDCP status report to the base station; receiving newly transmitted data transmitted by the base station through the second link and/or the first terminal retransmitted by the base station has not confirmed The received data packet receives the unsuccessfully received data packet and/or newly transmitted data indicated in the second PDCP status report retransmitted by the base station through the second link.
  • the method further includes: receiving a second target data packet transmitted by the base station; wherein the sequence number of the second target data packet is indicated to the base station by the relay device; the second target data The packet includes a sequence number of a data packet that the relay device has not forwarded to the first terminal and/or a data packet that the first terminal has not confirmed to receive.
  • Fig. 4 is a schematic diagram of downlink data packet transmission provided by an embodiment.
  • the transmission of downlink data may also have packet loss problems.
  • the relay device sends packet 1 to UE1
  • the link quality of the PC5 between the relay device and UE1 suddenly deteriorates or RLF occurs, and packets 2, 4 are still buffered in the relay device and not sent to UE1.
  • the base station starts from packet 3 and delivers it to the Uu interface for transmission, then there will be packet loss, and UE1 fails to receive packet 2.
  • this embodiment adopts the following method to ensure lossless transmission between the base station and UE1 during link handover:
  • Method 1 When UE1 instructs the base station for link switching or base station decision-making and instructs UE1 for link switching, UE1 sends a PDCP status report for downlink data to the base station through the Uu interface, and the base station responds to packets that are not confirmed to be received in the PDCP status report. Retransmission, it is not necessary to repeat the transmission of the packet that has been confirmed to be received.
  • Method 2 When the relay device detects RLF on the PC5 interface with UE1, the relay device sends indication information to the base station through RRC messages (such as FailureInformation, or sidelinkUEInformation, or other uplink RRC messages), and informs the relay device that it has not been forwarded
  • RRC messages such as FailureInformation, or sidelinkUEInformation, or other uplink RRC messages
  • FIG. 5 is a schematic diagram of the implementation of link switching provided by an embodiment.
  • UE1 has established an RRC connection with the base station through a relay device, and forwards data through the relay device.
  • the base station sends the link switching criterion and/or measurement configuration to UE1 through the RRC reconfiguration message (forwarded by the relay device);
  • UE1 performs Uu interface measurement and PC5 interface measurement based on the measurement configuration, and reports the measurement result to the base station according to the measurement report condition ;
  • the base station determines whether to perform link switching based on the measurement result information reported by UE1.
  • link switching configuration information may include at least one of the following: link switching indication, switching service type, switching PDU session identification ID, switching DRB, switching QoS flow Information, such as QoS flow identifier (QFI), fifth-generation mobile communication quality of service identifier (5G QoS identifier, 5QI), Uu RLC bearer configuration information associated with DRB, DRB PDCP retransmission indication, Uu associated with SRB RLC carries configuration information, etc.
  • QFI QoS flow identifier
  • 5G QoS identifier fifth-generation mobile communication quality of service identifier
  • Uu RLC bearer configuration information associated with DRB DRB PDCP retransmission indication
  • Uu associated with SRB RLC carries configuration information, etc.
  • UE1 can determine whether to perform link switching according to the measurement results and link switching criteria. If link switching is performed, it sends a link switching notification to the base station; the base station configures the Uu RLC bearer associated with the DRB through the RRC reconfiguration message Optional, including DRB PDCP retransmission indication. On this basis, the base station can send the first PDCP status report to UE1 to indicate whether there are unconfirmed received data packets. If they exist, UE1 retransmits these data packets. If not, UE1 can continue to transmit new data packets. , So as to ensure lossless transmission.
  • the first link is a link that communicates with the target node through a first relay device
  • the second link is a link that communicates with the target node through a second relay device.
  • the target node is the second terminal (denoted as UE2).
  • Fig. 6 is a schematic diagram of a communication link between a handover and a terminal provided by an embodiment. As shown in Figure 6,
  • UE1 and UE2 establish a unicast connection and perform data forwarding through the L2 first relay device (relay 1), and the end-to-end PC5-S/PC5-RRC and the end-to-end service data adaptation protocol are maintained between UE1 and UE2.
  • Data Adaptation Protocol, SDAP) or PDCP and forwards data through the PC5 backhaul (BH) RLC bearer between the PC5 and the relay 1.
  • SDAP Secure Adaptation Protocol
  • PDCP Packet Control Protocol
  • UE1 In the process of switching/changing the link from relay 1 to relay 2, as shown in Figure 6, UE1 has delivered packets 1, 2, 3, 4 to the PC5 interface for transmission to relay 1, and the PC5 interface is RLC AM Mode transmission, and UE1 receives the packet 1, 2, 4 confirmation reception indication sent by relay 1, and the indication that packet 3 did not receive. If link switching is performed at this time, UE1 can perform PDCP data discovery, starting from the first unconfirmed The received packet (i.e. packet 3) starts to be delivered to the Uu interface for transmission; relay 1 continues to send packets 1, 2, 4 to UE2, and UE2 receives packets 1, 2, 4 forwarded by relay 1, and packets 3 forwarded by UE1 through relay 2. ,4,5,6..., UE2 performs duplicate packet detection, discards the duplicate packet packet 4, and performs PDCP reordering, and delivers the data packets to the upper layer in order.
  • the link switching criterion includes at least one of the following: a fourth threshold of link quality of the first link; a switching instruction of the first relay device; the first relay device and the second relay device 2.
  • the fourth threshold of link quality of the first link refers to the PC5 link quality threshold between the first terminal and the first relay UE.
  • UE1 detects that the quality of the PC5 link with relay 1 is lower than the configured or pre-configured fourth threshold of link quality of the first link, or UE1 receives the L2 link release message sent by relay 1, or no longer acts as The indication of the relay device, or UE1 receives the indication information of the link between relay 1 and the target UE2 sent by relay 1 (such as L2 link release indication, RLF failure indication, link quality lower than the configured or pre-configured threshold Indication or link congestion indication, etc.), UE1 triggers the reselection of the relay device.
  • the method further includes: transmitting, through the second link, the first data packet that the first relay device has not confirmed to receive and the data packets after the first data packet.
  • the first relay device in the case of reselecting the relay device, during the link switching process, the first relay device does not confirm the receipt of the data packet, and the subsequent data packets are transmitted through the second link, thereby ensuring the service service. Continuity.
  • the method further includes: receiving a third PDCP status report sent by the second terminal;
  • the third PDCP status report retransmit the data packet indicated in the third PDCP status report that the second terminal has not successfully received and/or transmit the newly transmitted data through the second link.
  • the method further includes: receiving second indication information of the first relay device, where the second indication information includes at least one of the following: RLF indication information; the sequence number of the third target data packet; The second indication information transmits a third target data packet through the second link, and the third target data packet includes a data packet that is not forwarded to the second terminal by the first relay device and/or the first The second terminal did not confirm the received data packet.
  • the first relay device forwards the fourth target data packet to the second terminal through the third link; the fourth target data packet includes the first relay Data packets not forwarded by the device to the second terminal and/or data packets not confirmed to be received by the second terminal.
  • the method further includes: receiving a first radio link layer control protocol RLC status report sent by the first relay device; transmitting a fifth target data packet according to the first RLC status report; wherein, the The first RLC status report is determined by the first relay device based on the second RLC status report sent by the second terminal to the first relay device; the fifth target data packet includes the first RLC status The unacknowledged packets indicated in the report.
  • Method 1 After relay 2 link is connected, UE2 sends a third PDCP status report to UE1 via relay 2, the report is not received from packet 2 (packet 1 has been received); then UE1 based on the third PDCP status report, from Packet 2 starts to be transmitted through the link of relay 2.
  • UE2 After UE2 sends the third PDCP status report, it may initiate the release of the connection with relay 1 or instruct relay 1 not to forward UE1's data.
  • Method 2 When relay 1 detects that the PC5 link with UE2 is broken or RLF occurs, relay 1 sends instructions to UE1 through a PC5 RRC message to inform the PC5 link with UE2 that RLF has occurred and relay 1 has not been forwarded The PDCP SN that has been forwarded but has not yet received the data packet acknowledging the reception of the feedback indication sent by UE2. After UE1 receives it, it starts transmission via relay 2 link from the PDCP SN indicated by relay 1.
  • the PC5 RRC indication information sent by relay 1 to UE1 includes at least one of the following: PC5 RLF indication; PDCP SN of the data packet that has not been forwarded to the second terminal (UE2), such as the smallest PDCP SN in ascending order or COUNT value; the PDCP SN of the data packet that has been forwarded but not yet received from the base station to confirm receipt of the feedback indication, such as the smallest PDCP SN or COUNT value in ascending order.
  • the first relay device can identify the PDCP SN in the PDCP packet header.
  • Method 3 Relay 1 searches for other paths with UE2, that is, the third link, and forwards the buffered data to UE2 through the third link. For example, if relay 1 finds that relay 3 can be connected to UE2, then relay 1 forwards the data packets that have not been forwarded or that have been forwarded but not yet confirmed to be received to relay 3, and relay 3 then forwards it to UE2; or UE1 passes the selected relay 2 through PC5 RRC The message informs relay 1, and relay 1 tries to connect to relay 2. If it can be connected to relay 2, it can send data packets that have not been forwarded and or have been forwarded but not yet confirmed to be received to relay 2 and forwarded to UE2.
  • Method 4 End-to-end RLC automatic repeat request (Automatic Repeat-reQuest, ARQ) is supported between UE1 and UE2, and the PDCP layer performs retransmission based on RLC feedback (feedback). For example, after relay 1 receives packet 1, 2, 4 (packet 3 has not been received yet) from UE1, it does not send RLC acknowledgement (Acknowledgement, ACK) or non-acknowledgement (Negative-Acknowledgment, NACK) feedback. The information is sent to UE1, but the data packet is forwarded to UE2, and after receiving the RLC ACK/NACK feedback information sent by UE2, the RLC ACK/NACK feedback information is sent to UE1.
  • RLC acknowledgement Acknowledgement
  • NACK non-acknowledgement
  • the RLC ACK/NACK feedback information sent by relay 1 to UE1 includes the last data packet confirmed to be received by UE2 and the data packet that has not been confirmed to be received before. Because relay 1 repackages the RLC SN of the received data packet when forwarding the data packet, this method requires relay 1 to save the RLC SN of the received (Ingress Link) data packet and the RLC SN repackaged during the forwarding (Egress Link). Mapping relationship, so that relay 1 reverses the RLC SN on the Ingress Link based on the RLC SN confirmed to be received on the Egress Link, and then feeds back the RLC ACK/NACK on the Ingress Link to UE1.
  • FIG. 7 is a schematic diagram of the implementation of link switching provided by another embodiment.
  • UE1 reselects the second relay device and establishes an L2 link connection with the second relay device.
  • the second relay device establishes/updates the L2 link with UE2; UE1 and the second relay
  • the device interacts with the PC5 BH RLC bearer configuration used for data forwarding, and the mapping relationship between the end-to-end sidelink radio bearer (SLRB) and the new PC5 BH RLC bearer between UE1 and UE2.
  • SLRB end-to-end sidelink radio bearer
  • UE1 carries the end-to-end SLRB QoS in a PC5 RRC message to inform the second relay device; the second relay device interacts with UE2 to configure the PC5 BH RLC bearer configuration for data forwarding, and UE1, the second medium The relay device and UE2 establish a PC5 BH RLC bearer based on the configuration information.
  • UE2 sends a third PDCP status report to UE1 via the second relay device (for example, the report has not been received from packet 2 (packet 1 has been received); UE1 retransmits based on the third PDCP status report, and the reception from UE2 has not been confirmed
  • the data packet (such as packet 2) starts to be transmitted through the second relay device link, thereby ensuring lossless transmission and service continuity during the link switching process.
  • the method further includes: reporting link switching notification information to the target node;
  • the link switching notification information includes at least one of the following: link switching indication; switching service type; switching PDU session identifier; switching DRB; switching QoS flow information; RLC bearer configuration information associated with DRB; relay Equipment Identity.
  • the UE1 notifies the base station after link switching, and reports the path switching notification information to the base station.
  • the method before switching from the first link to the second link, the method further includes: acquiring serving cell information of the relay device, where the serving cell information includes at least one of the following: evolution UMTS Terrestrial Radio Access Network (Evolution UMTS Terrestrial Radio Access Network, E-UTRAN) Cell Global Identifier (ECGI); New Radio Cell Global Identifier (NCGI); Base Station (gNB) Identification; Global Base Station (gNB) identification; Single Network Slice Selection Assistance information (S-NSSAI).
  • Evolution UMTS Terrestrial Radio Access Network E-UTRAN
  • ECGI Evolution UMTS Terrestrial Radio Access Network
  • NGI New Radio Cell Global Identifier
  • gNB Base Station Identification
  • gNB Global Base Station
  • S-NSSAI Single Network Slice Selection Assistance information
  • the method further includes: before switching from the first link to the second link, the method further includes: reporting relay device related information to the target node, where the relay device related information includes At least one of the following: the identifier of the relay device; the serving cell information of the relay device; the measurement information of the relay device; the measurement information includes at least one of the following: PC5 reference signal received power RSRP; PC5 reference signal received quality RSRQ, PC5 received signal strength indicator RSSI.
  • the first link is a link that directly communicates with the target node, and the target node is a source base station; and the second link is a link that communicates with the target base station through a relay device. .
  • the source base station is used to send a handover request message to the target base station
  • the handover request message includes at least one of the following: the first terminal identifier; the first terminal cell radio network temporary identifier (Cell Radio Network Temporary Identifier, C-RNTI), QoS flow and DRB mapping, QoS flow quality of service parameters; Following the device identification.
  • the first terminal identifier the first terminal cell radio network temporary identifier (Cell Radio Network Temporary Identifier, C-RNTI), QoS flow and DRB mapping, QoS flow quality of service parameters; Following the device identification.
  • C-RNTI Cell Radio Network Temporary Identifier
  • QoS flow and DRB mapping QoS flow quality of service parameters
  • the target base station is further configured to send a link switch request to the core network element and indicate the relationship between the relay device and the first terminal;
  • the link switch request includes at least one of the following: Relay device identification; relay device indication; first terminal identification.
  • the relay device identification refers to the ID identification of the relay device as the relay UE L2; the relay device indication refers to the first terminal itself as the relay UE.
  • FIG. 8 is a schematic diagram of the implementation of link switching provided by another embodiment.
  • UE1 is connected to base station 1 (source base station), and communicates with the source base station through the Uu port; when the Uu link quality of UE1 deteriorates, UE1 finds the relay device and selects the relay device, and then the relay device Communication with the network, where the base station of the relay device is different from the base station of UE1, and the relay device is connected to the target base station.
  • the process of switching from the communication link of the source base station to the link of the target base station is as follows:
  • Step 1 UE1 receives RRC reconfiguration and/or measurement configuration information sent by the source base station; wherein, the measurement configuration information includes Uu port measurement configuration and or Sidelink measurement configuration (or PC5/relay measurement configuration), and Sidelink measurement configuration includes the following At least one: relay measurement indication, PC5 interface RSRP, PC5 interface RSRQ, PC5 interface RSSI, measurement information; wherein the measurement information includes: PC5RSRP/RSRQ/RSSI measurement value, relay device identifier, and relay device serving cell Logo.
  • the measurement configuration information includes Uu port measurement configuration and or Sidelink measurement configuration (or PC5/relay measurement configuration)
  • Sidelink measurement configuration includes the following At least one: relay measurement indication, PC5 interface RSRP, PC5 interface RSRQ, PC5 interface RSSI, measurement information
  • the measurement information includes: PC5RSRP/RSRQ/RSSI measurement value, relay device identifier, and relay device serving cell Logo.
  • Step 2 UE1 discovers and measures the quality of the PC5 link with the relay device; UE1 obtains information about the serving cell of the relay device, including any of the following information: ECGI, NCGI, gNB identity, global gNB identity, S-NSSAI; among them, The UE1 may receive the serving cell information sent by the relay device in the discovery advertisement message or the discovery reception message or the discovery additional message.
  • Step 3 UE1 reports the measurement result information to the base station according to the measurement configuration, where the measurement result information includes at least one of the following: PC5 RSRP, PC5 RSRQ, PC5 RSSI measurement value, relay device identifier, relay device serving cell information, received by the source base station Measure the result information, make a measurement decision, and decide to switch to the communication link of the relay device.
  • the measurement result information includes at least one of the following: PC5 RSRP, PC5 RSRQ, PC5 RSSI measurement value, relay device identifier, relay device serving cell information, received by the source base station Measure the result information, make a measurement decision, and decide to switch to the communication link of the relay device.
  • Step 4 The source base station sends a handover request message to the target base station (ie, the serving base station of the relay device), including at least one of the following: relay device identifier, relay device C-RNTI, QoS flow and DRB mapping, QoS flow service Quality parameter; relay equipment indication; where the relay equipment identifier (remote UE identifier or relay identifier) is the UE L2 ID.
  • the target base station ie, the serving base station of the relay device
  • relay equipment indication where the relay equipment identifier (remote UE identifier or relay identifier) is the UE L2 ID.
  • Step 5 The target base station notifies the relay device to forward data for UE1, which specifically includes at least one of the following: relay forwarding indication, UE1 identifier, Uu relay BH bearer configuration, SL BH bearer configuration; medium
  • the subsequent device establishes a relay and forwards the bearer and replies with a response message.
  • Step 6 The target base station sends a handover response message to the source base station, where the handover command includes at least one of the following: SL BH bearer configuration, Uu DRB and SL BH bearer mapping relationship.
  • Step 7 The source base station receives the handover response message and forwards the handover command in it to UE1.
  • UE1 and the relay device exchange SL BH bearer configuration through PC5 RRC signaling.
  • Step 8 Serial number status switching, that is, the conversion of data packet sequence numbers.
  • Step 9 UE1 performs configuration and sends a reconfiguration complete message to the target base station after accessing the target base station through the relay device.
  • Step 10 The target base station sends a link switch request to the core network element (such as Access and Mobility Management Function (AMF)) and instructs the relationship between the relay device and UE1, that is, the link switch
  • the request message includes: relay device identification, relay device indication and/or UE1 identification.
  • the target base station receives the link switching response message.
  • AMF Access and Mobility Management Function
  • Step 11 After the link switching is completed, the target base station notifies the source base station to release the UE1 context information. Then, UE1 communicates with the network through the relay device.
  • the link switching method of this embodiment realizes the switching between the direct communication link and the relay communication link, the reselection of the relay device, and the switching of the communication link from the source base station to the target base station, which can be flexibly adapted
  • Various actual network states ensure the continuity of business services; and the lossless data transmission between the first terminal and the target node is ensured by processing packet loss data, thereby improving the quality and reliability of wireless communication.
  • the embodiment of the present application also provides a link switching configuration method.
  • the base station sends link switching configuration information to the first terminal to instruct the first terminal to perform link switching. On this basis, the base station transmits data with the first terminal, which can flexibly adapt to various actual network conditions to ensure the continuity of business services.
  • Fig. 9 is a flowchart of a link switching configuration method provided by an embodiment.
  • the link handover configuration method of this embodiment can be applied to a base station, and the operation performed by the base station corresponds to the link handover method applied to the first terminal in the above embodiment.
  • the technical details that are not described in detail in the following embodiments can be used. Participate in any of the above examples.
  • the method provided in this embodiment includes step 210 and step 220.
  • step 210 link switching configuration information is sent to the first terminal.
  • step 220 data is transmitted with the first terminal.
  • the link switching configuration information includes at least one of the following: link switching criteria; switching indication information;
  • the handover indication information includes at least one of the following: handover indication; relay device identifier; handover service type; handover protocol data unit PDU session identifier; handover data radio bearer DRB; handover quality of service QoS flow information; DRB PDCP Retransmit instructions.
  • the data transmission with the first terminal includes:
  • it further includes:
  • it further includes:
  • the newly transmitted data is transmitted according to the second PDCP status report and/or the data packet indicated in the second status report that is not successfully received is retransmitted.
  • it further includes:
  • first indication information of the relay device where the first indication information includes at least one of the following: RLF indication information; the sequence number of the first target data packet;
  • the first target data packet includes a data packet that the relay device has not forwarded to the base station and/or a data packet that the base station has not confirmed to receive.
  • it further includes:
  • the second target data packet includes a sequence number of a data packet that is not forwarded to the first terminal by the relay device and/or a data packet that the first terminal has not confirmed to receive.
  • it further includes:
  • the relay device related information includes at least one of the following: a relay device identifier; information about a serving cell of the relay device; measurement information on the relay device;
  • the measurement information includes at least one of the following: PC5 reference signal received power RSRP; PC5 reference signal received quality RSRQ, and PC5 received signal strength indicator RSSI.
  • it further includes:
  • the handover request message includes at least one of the following: a first terminal identifier; a radio network temporary identifier C-RNTI of the first terminal cell, a mapping between a QoS flow and a DRB, a QoS flow quality of service parameter, and a relay device identifier.
  • FIG. 10 is a schematic structural diagram of a link switching device provided by an embodiment. As shown in FIG. 10, the link switching device includes: a configuration information receiving module 310 and a link switching module 320.
  • the configuration information receiving module 310 is configured to receive link switching configuration information
  • the link switching module 320 is configured to switch from the first link communicating with the target node to the second link according to the link switching configuration information.
  • the link switching device of this embodiment performs link switching according to link switching configuration information, flexibly adapts to actual network conditions, ensures the continuity of business services, and improves the reliability of the communication link.
  • the link switching configuration information includes at least one of link switching criteria and switching indication information.
  • the link switching module 320 is specifically set to at least one of the following:
  • the handover indication information includes at least one of the following: handover indication; relay device identifier; handover service type; handover protocol data unit PDU session identifier; handover data radio bearer DRB; handover quality of service QoS flow Information; DRB PDCP retransmission instruction.
  • the first link is a link that directly communicates with the target node
  • the second link is a link that communicates with the target node through a relay device
  • the target node is Base station
  • the link switching criterion includes at least one of the following: a first link quality threshold of the first link; a first preset service type; and a PC5 interface link quality threshold of the second link.
  • the link switching criterion is satisfied when at least one of the following is satisfied:
  • the link quality of the first link is lower than the first threshold of link quality
  • the service type of the first link is a first preset service type
  • the PC5 interface link quality of the second link is higher than the PC5 interface link quality threshold of the second link.
  • the first link is a link that communicates with the target node through a relay device
  • the second link is a link that directly communicates with the target node
  • the target node is Base station.
  • the link switching criterion includes at least one of the following: the second link quality threshold of the second link; the PC5 interface link quality threshold of the first link; the link between the relay device and the base station The third quality threshold; the first channel busy and idle rate threshold; the second channel busy and idle rate threshold.
  • the link switching criterion is satisfied when at least one of the following is satisfied: the link quality of the second link is higher than the second threshold of link quality; the first link The link quality of the PC5 interface of the first link is lower than the link quality threshold of the PC5 interface of the first link; the link quality between the relay device and the base station is lower than the third threshold of link quality; The channel busy/idle rate of any resource pool of the PC5 interface of the first link is higher than the first channel busy/idle rate threshold; the average value of the channel busy/idle rate of all resource pools of the PC5 interface of the first link is higher than the said The second channel busy/idle rate threshold.
  • it further includes:
  • the first packet transmission module is configured to transmit the first data packet not confirmed to be received by the relay device and the data packets after the first data packet through the second link.
  • it further includes:
  • the first report module is configured to receive the first packet data convergence protocol PDCP status report sent by the base station;
  • the first transmission module is configured to, according to the first PDCP status report, retransmit the unsuccessfully received data packets indicated in the first PDCP status report and/or transmit new transmissions via the second link data.
  • it further includes:
  • the first indication module is configured to receive first indication information of the relay device, where the first indication information includes at least one of the following: radio link failure RLF indication information; the sequence number of the first target data packet;
  • a second transmission module configured to transmit the first target data packet through the second link according to the first indication information
  • the first target data packet includes a data packet that the relay device has not forwarded to the base station and/or a data packet that the base station has not confirmed to receive.
  • it further includes:
  • the second report module is configured to send a second PDCP status report to the base station
  • the third transmission module is configured to receive unsuccessfully received data packets and/or newly transmitted data indicated in the second PDCP status report retransmitted by the base station through the second link.
  • it further includes:
  • a fourth transmission module configured to receive a second target data packet transmitted by the base station
  • sequence number of the second target data packet is indicated to the base station by the relay device
  • the second target data packet includes a sequence number of a data packet that is not forwarded to the first terminal by the relay device and/or a data packet that the first terminal has not confirmed to receive.
  • the first link is a link that communicates with the target node through a first relay device
  • the second link is a link that communicates with the target node through a second relay device.
  • the target node is the second terminal.
  • it further includes:
  • the second packet transmission module transmits the first data packet not confirmed to be received by the first relay device and the data packets after the first data packet through the second link.
  • it further includes:
  • a third report module configured to receive a third PDCP status report sent by the second terminal
  • the fifth transmission module is configured to retransmit the data packet and/or transmission that the second terminal indicated in the third PDCP status report did not successfully receive via the second link according to the third PDCP status report Newly transmitted data.
  • it further includes:
  • the second indication module is configured to receive second indication information of the first relay device, where the second indication information includes at least one of the following: RLF indication information; the sequence number of the third target data packet;
  • the sixth transmission module is configured to transmit a third target data packet through the second link according to the second indication information, where the third target data packet includes that the first relay device is not forwarded to the second The data packet of the terminal and/or the data packet that the second terminal has not confirmed to receive.
  • the first relay device forwards the fourth target data packet to the second terminal through the third link
  • the fourth target data packet includes a data packet that the first relay device has not forwarded to the second terminal and/or a data packet that the second terminal has not confirmed receipt.
  • it further includes:
  • the report receiving module is configured to receive the first radio link layer control protocol RLC status report sent by the first relay device;
  • a seventh transmission module configured to transmit a fifth target data packet according to the first RLC status report
  • the first RLC status report is determined by the first relay device based on the second RLC status report sent by the second terminal to the first relay device; the fifth target data packet includes the The unacknowledged data packet indicated in the first RLC status report.
  • the link switching criterion includes at least one of the following: a fourth threshold of link quality of the first link; a switching instruction of the first relay device; the first relay device and the second relay device 2.
  • it further includes:
  • a notification module configured to report link switching notification information to the target node
  • the link switching notification information includes at least one of the following: link switching indication; switching service type; switching PDU session identifier; switching DRB; switching QoS flow information; RLC bearer configuration information associated with DRB; relay Equipment Identity.
  • the first link is a link that directly communicates with the target node, and the target node is a source base station;
  • the second link is a link for communicating with the target base station through the relay device.
  • it further includes:
  • the acquiring module is configured to acquire the serving cell information of the relay device before switching from the first link to the second link, and the serving cell information includes at least one of the following: E-UTRAN cell global Identifier ECGI; new air interface cell global identity NCGI; base station identity; global base station identity; single network slice selection auxiliary information S-NSSAI.
  • it further includes:
  • the reporting module is configured to report relay device related information to the source base station before switching from the first link to the second link, and the relay device related information includes at least one of the following: Relay equipment identification; relay equipment serving cell information; measurement information on the relay equipment;
  • the measurement information includes at least one of the following: PC5 reference signal received power RSRP; PC5 reference signal received quality RSRQ, and PC5 received signal strength indicator RSSI.
  • the source base station is used to send a handover request message to the target base station
  • the handover request message includes at least one of the following: a first terminal identifier; a radio network temporary identifier C-RNTI of the first terminal cell, a mapping between a QoS flow and a DRB, a QoS flow quality of service parameter, and a relay device identifier.
  • the target base station is further configured to send a link switching request to a core network element and indicate the relationship between the relay device and the first terminal;
  • the link switching request includes at least one of the following: a relay device identifier; a relay device indication; and a first terminal identifier.
  • the link switching device proposed in this embodiment and the link switching method proposed in the above embodiments belong to the same inventive concept.
  • technical details that are not described in detail in this embodiment please refer to any of the above embodiments, and this embodiment is equipped with an execution chain The same beneficial effect as the way switching method.
  • FIG. 11 is a schematic structural diagram of a link switching configuration device provided by an embodiment. As shown in FIG. 11, the link switching device includes: a configuration information sending module 410 and a data transmission module 420.
  • the configuration information sending module 410 is configured to send link switching configuration information to the first terminal
  • the data transmission module 420 is configured to transmit data with the first terminal.
  • the link switching configuration device of this embodiment instructs the first terminal to perform link switching by sending link switching configuration information to the first terminal, and on this basis, transmits data with the first terminal, which can flexibly adapt to various actual network states Ensure the continuity of business services.
  • the link switching configuration information includes at least one of the following: link switching criteria; switching indication information;
  • the handover indication information includes at least one of the following: handover indication; relay device identifier; handover service type; handover protocol data unit PDU session identifier; handover data radio bearer DRB; handover quality of service QoS flow information; DRB PDCP Retransmit instructions.
  • the data transmission module 420 is specifically configured as follows:
  • it further includes:
  • the report sending module is set to send the first PDCP status report
  • the packet receiving module is configured to receive unsuccessfully received data packets and/or newly transmitted data indicated in the first PDCP status report.
  • it further includes:
  • the report receiving module is configured to receive the second PDCP status report
  • the packet sending module is configured to transmit newly transmitted data according to the second PDCP status report and/or retransmit the data packets indicated in the second status report that have not been successfully received.
  • it further includes:
  • An indication information receiving module configured to receive first indication information of the relay device, the first indication information including at least one of the following: RLF indication information; the sequence number of the first target data packet;
  • An eighth transmission module configured to receive the first target data packet through the second link
  • the first target data packet includes a data packet that the relay device has not forwarded to the base station and/or a data packet that the base station has not confirmed to receive.
  • it further includes:
  • a ninth transmission module configured to send a second target data packet, wherein the sequence number of the second target data packet is indicated by the relay device;
  • the second target data packet includes a sequence number of a data packet that is not forwarded to the first terminal by the relay device and/or a data packet that the first terminal has not confirmed to receive.
  • it further includes:
  • the related information receiving module is configured to receive relay device related information, where the relay device related information includes at least one of the following: a relay device identifier; information on a serving cell of the relay device; measurement information on the relay device;
  • the measurement information includes at least one of the following: PC5 reference signal received power RSRP; PC5 reference signal received quality RSRQ, and PC5 received signal strength indicator RSSI.
  • it further includes:
  • the request module is set to send a handover request message to the target base station
  • the handover request message includes at least one of the following: a first terminal identifier; a radio network temporary identifier C-RNTI of the first terminal cell, a mapping between a QoS flow and a DRB, a QoS flow quality of service parameter, and a relay device identifier.
  • the link switching configuration device proposed in this embodiment and the link switching configuration method proposed in the above embodiments belong to the same inventive concept.
  • technical details not described in detail in this embodiment please refer to any of the above embodiments, and this embodiment has the same Perform the same beneficial effects as the link switching configuration method.
  • the embodiment of the present application also provides a communication node.
  • the link switching method may be executed by a link switching device, which may be implemented by software and/or hardware, and integrated in the communication node, which is a base station.
  • the link switching configuration method may be executed by a link switching configuration device, which may be implemented by software and/or hardware and integrated in the communication node, which is a terminal .
  • FIG. 12 is a schematic diagram of the hardware structure of a communication node provided by an embodiment.
  • a communication node provided in this embodiment includes a processor 510 and a storage device 520.
  • one processor 510 is taken as an example.
  • the processor 510 and the storage device 520 in the device may be connected by a bus or other methods. Take the bus connection as an example.
  • the one or more programs are executed by the one or more processors 510, so that the one or more processors implement the link switching method or the link switching configuration method described in any of the foregoing embodiments.
  • the storage device 520 in the communication node can be used to store one or more programs.
  • the programs can be software programs, computer-executable programs, and modules, such as the link switching in the embodiment of the present invention.
  • the program instructions/modules corresponding to the method include: a configuration information receiving module 310 and a link switching module 320).
  • the processor 510 executes various functional applications and data processing of the communication node by running the software programs, instructions, and modules stored in the storage device 520, that is, implements the link switching method or the link switching configuration method in the above method embodiment .
  • the storage device 520 mainly includes a storage program area and a storage data area.
  • the storage program area can store an operating system and an application program required by at least one function; the storage data area can store data created according to the use of the device, etc. Example link switch configuration information, data packets, etc.).
  • the storage device 520 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.
  • the storage device 520 may further include a memory remotely provided with respect to the processor 510, and these remote memories may be connected to a communication node through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
  • the following operations are implemented: receiving link switching configuration information; and communicating with the target node according to the link switching configuration information The first link of communication is switched to the second link.
  • Data is transmitted with the terminal through the communication link with the terminal.
  • the communication node proposed in this embodiment belongs to the same inventive concept as the link switching method or link switching configuration method proposed in the above embodiment.
  • the embodiment of the present application also provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions are used to execute a link switching method or a link switching configuration method when executed by a computer processor.
  • this application can be implemented by software and general hardware, or can be implemented by hardware.
  • the technical solution of the present application can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), Random Access Memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including multiple instructions to make a computer device (which can be a personal computer, server, or network device, etc.) execute any of this application The method described in the embodiment.
  • the block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions.
  • the computer program can be stored on the memory.
  • the memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read only memory (ROM), random access memory (RAM), optical storage devices and systems (digital multi-function optical discs) DVD or CD) etc.
  • Computer-readable media may include non-transitory storage media.
  • the data processor can be any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSP), application-specific integrated circuits (ASIC), programmable logic devices (FGPA) And processors based on multi-core processor architecture.
  • DSP digital signal processors
  • ASIC application-specific integrated circuits
  • FGPA programmable logic devices

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Abstract

本申请提供一种链路切换、链路切换配置方法、装置、通信节点及介质。该方法接收链路切换配置信息；根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。

Description

链路切换、链路切换配置方法、装置、通信节点及介质
本申请要求在2020年2月13日提交中国专利局、申请号为202010091485.5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
本申请涉及无线通信网络，例如涉及一种链路切换、链路切换配置方法、装置、通信节点及介质。
背景技术
随着无线多媒体业务的发展，人们对高数据速率和用户体验的需求日益增长，对无线网络的系统容量和覆盖也提出高要求。移动终端除了直接与目标节点(例如基站或其他移动终端)通信以外，还可以通过基于旁路(Sidelink)的中继设备实现与目标节点之间的数据传输，从而支持更广范围的应用和服务，扩展覆盖和改善功耗。目前，缺乏有效的机制确定移动终端与目标节点之间的通信链路，无法适应不同的实际网络情况，导致业务中断、服务质量变差，通信链路的可靠性低。
发明内容
本申请提供一种链路切换、链路切换配置方法、装置、通信节点及介质，以提高无线通信的灵活性和可靠性。
本申请实施例提供一种链路切换方法，应用于第一终端(User Equipment，UE)，包括：
接收链路切换配置信息；
根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。
本申请实施例还提供了一种链路切换配置方法，应用于基站，包括：
向第一终端发送链路切换配置信息；
与所述第一终端传输数据。
本申请实施例还提供了一种链路切换装置，包括：
配置信息接收模块，设置为接收链路切换配置信息；
链路切换模块，设置为根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。
申请实施例还提供了一种链路切换配置装置，包括：
配置信息发送模块，设置为向第一终端发送链路切换配置信息；
数据传输模块，设置为与所述第一终端传输数据。
本申请实施例还提供了一种通信节点，包括：
一个或多个处理器；
存储装置，用于存储一个或多个程序；
当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现上述的链路切换方法或链路切换配置方法。
本申请实施例还提供了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，该程序被处理器执行时实现上述的链路切换方法或链路切换配置方法。
附图说明
图1为无线通信系统中的通信链路的示意图；
图2为一实施例提供的一种链路切换方法的流程图；
图3为一实施例提供的上行数据包传输的示意图；
图4为一实施例提供的下行数据包传输的示意图；
图5为一实施例提供的链路切换的实现示意图；
图6为一实施例提供的切换与终端之间的通信链路的示意图；
图7为另一实施例提供的链路切换的实现示意图；
图8为又一实施例提供的链路切换的实现示意图；
图9为一实施例提供的一种链路切换配置方法的流程图；
图10为一实施例提供的一种链路切换装置的结构示意图；
图11为一实施例提供的一种链路切换配置装置的结构示意图；
图12为一实施例提供的一种通信节点的硬件结构示意图。
具体实施方式
下面结合附图和实施例对本申请进行说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本申请，而非对本申请的限定。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。另外还需要说明的是，为了便于描述，附图中仅示出了与本申请相关的部分而非全部结构。
在无线通信系统中，传统的以基站为中心的蜂窝网络在高数据速率以及邻近服务的支持方面存在明显的局限性，在这种需求下，基于设备到设备(Device-to-Device，D2D)的通信技术应运而生。UE除了直接与目标节点(例如基站或其他移动终端)通信以外，还可以通过基于旁路的中继设备实现与目标节点之间的数据传输，从而支持更广范围的应用和服务，扩展覆盖和改善功耗，改善网络基础设施的鲁棒性，满足高数据速率业务和邻近服务的要求。D2D技术又称之为邻近服务(Proximity Services，ProSe)，单边/旁链/直通链路(Sidelink，SL)通信；设备与设备之间的接口为直通链路PC5接口。
图1为无线通信系统中的通信链路的示意图。如图1所示，Sidelink中继通信主要有两种应用场景：1)UE与基站的中继传输，在弱/无覆盖区域的UE中继传输，如图1中的模式1所示，允许信号质量较差的或无覆盖的UE1通过附近有网络覆盖的UE2与网络进行通信，利于运营商扩展覆盖、提高容量，其中，UE2为中继设备，即UE-to-Network relay；2)UE与UE的中继传输：例如在发生地震或紧急情况，蜂窝网络不能正常工作的情况下，或者为了扩展Sidelink通信范围，允许设备间通过中继UE进行通信，如图1中的模式2所示，UE3 和UE4之间通过UE5或多跳中继UE进行数据通信，其中UE5为中继设备，即UE-to-UE relay。
目前，缺乏有效的机制确定UE与目标节点之间的通信链路，无法适应不同的实际网络情况，导致业务中断、服务质量变差，通信链路的可靠性低。
此外，长期演进(Long Term Evolution，LTE)中提供了基于网际互连协议(Internet Protocol，IP)层(Layer 3，层3)和接入层(Layer 2，层2)两种UE-to-Network relay的技术方案。其中层3(IP层)的中继传输，即根据目标IP地址/端口号等信息进行数据的转发；层2(接入层)的中继传输，即中继UE在接入层进行控制面和用户面数据的路由转发，使得运营商(即核心网网元以及基站)更有效的管理远端设备(Remote UE)。新空口(New Radio，NR)Sidelink通信与LTE sidelink通信机制存在较大差别，如帧结构、QoS处理、承载配置及建立等，基于LTE的Sidelink的中继传输的技术方案并不适用于5G或NR系统。
在本申请实施例中，提供一种链路切换方法，第一终端(即远端设备)根据链路切换配置信息进行链路切换，灵活适应实际网络情况，保证业务服务的连续性，提高通信链路的可靠性。
图2为一实施例提供的一种链路切换方法的流程图。本实施例的方法可应用于第一终端(记为UE1)。如图2所示，本实施例提供的方法包括步骤110和步骤120。
在步骤110中，接收链路切换配置信息。
在步骤120中，根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。
本实施例中，链路切换(Path Switch或Link Switch)包含如下情况：
情况1：由与目标节点直接通信(Direct Uu Link)切换至基于PC5或SL接口的中继通信。这种情况下，UE1处于无线资源控制(Radio Resource Control，RRC)连接态，在切换前与目标节点通过第一链路直接通信；当Uu信道质量变 差时，UE1确定中继设备并切换到第二链路，在第二链路中通过中继设备将数据转发给目标节点，其中，UE1的基站与中继设备的基站可以为同一基站或不同的基站。
情况2：由基于PC5或SL接口的中继通信切换至与目标节点直接通信：这种情况下，在切换前，UE1通过中继设备与网络通信；当UE1进入基站覆盖并建立RRC连接时，可以将通过中继设备转发的业务切换到Uu链路上，直接传输给基站，其中，UE1的基站与中继设备的基站可以为同一基站或不同的基站。
情况3：中继通信链路之间的切换：这种情况下发生了中继设备的重选，UE1所连接的中继设备改变。例如，切换前UE1通过第一中继设备与基站通信，切换后UE1通过第二中继设备与基站通信，通过第一中继设备转发的业务切换到通过第二中继设备转发的链路上进行，其中，第一中继设备和第二中继设备对应的基站可为同一基站或不同基站。
本实施例中，UE1在当前链路的信号质量较差或者基站覆盖情况变化等情况下，可以实现直通链路或中继通信链路的切换，或者中继设备的重选，有效通过中继设备实现数据转发，提高通信链路的灵活性和可靠性。
在一实施例中，链路切换配置信息包括链路切换准则和切换指示信息中的至少之一。
本实施例中，目标节点向UE1发送链路切换准则，UE1根据链路切换准则决策是否进行链路切换，或者，目标节点向UE1发送切换指示信息，指示UE1进行链路切换。所述链路切换配置信息由目标节点配置，或者由系统预配置或由协议定义。
在一实施例中，所述根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路，包括下述至少之一：在满足链路切换准则的情况下通知目标节点，并根据目标节点配置的切换指示信息由第一链路切换至第二链路；根据目标节点配置的切换指示信息由第一链路切换至第二链路；在满足链路切 换准则的情况下由第一链路切换至第二链路
本实施例中，可以由目标节点配置链路切换准则并发送至UE1，UE1检测到满足链路切换准则时通知目标节点，由目标节点决策并并发送切换指示信息，从而指示UE1是否进行链路切换；或者，UE1根据目标节点配置的测量配置对信道质量、业务类型等进行测量并上报给目标节点，由目标节点决策并发送切换指示信息，从而指示UE1是否进行链路切换；或者，由目标节点配置或预配置链路切换准则，在UE1检测到满足链路切换准则的情况下，UE1自主进行切换。
在一实施例中，切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元(Protocol Data Unit，PDU)会话标识；切换的数据无线承载(Data Radio Bearer，DRB)；切换的服务质量(Quality of Service，QoS)流信息；DRB分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)重传指示。
在一实施例中，第一链路为直接与所述目标节点通信的链路，所述第二链路为通过中继设备与所述目标节点通信的链路，目标节点为基站；链路切换准则包括以下至少之一：第一链路的链路质量第一阈值；第一预设业务类型；第二链路的PC5接口链路质量阈值。
在一实施例中，在满足以下至少之一的情况下，满足所述链路切换准则：所述第一链路的链路质量低于所述链路质量第一阈值；所述第一链路的业务类型为第一预设业务类型；所述第二链路的PC5接口链路质量高于所述第二链路的PC5接口链路质量阈值。
本实施例中，对于上述的情况1，在第一链路(Uu链路)的链路质量低于第一链路的链路质量第一阈值(针对Uu接口链路)的情况下，可以切换至第二链路，其中，链路质量第一阈值可以包括一定的迟滞值；在第一链路上的业务类型为第一预设业务类型(例如某些类型业务的数据需要通过PC5接口传输) 的情况下，可以切换至第二链路；在第二链路(PC5链路)的链路质量高于第二链路的PC5接口链路质量阈值的情况下，可以切换至第二链路，例如，UE1与中继UE之间的PC5接口的链路质量高于该第二链路的PC5接口链路质量阈值，则可执行链路切换。在此过程中，UE1可以对第一链路和第二链路分别进行测量。
在一实施例中，所述第一链路为通过中继设备与所述目标节点通信的链路，所述第二链路为直接与所述目标节点通信的链路，所述目标节点为基站。
在一实施例中，所述链路切换准则包括以下至少之一：第二链路的链路质量第二阈值；第一链路的PC5接口链路质量阈值；中继设备与基站的链路质量第三阈值；第一信道忙闲率阈值；第二信道忙闲率阈值。
在一实施例中，在满足以下至少之一的情况下，满足所述链路切换准则：所述第二链路的链路质量高于所述链路质量第二阈值；所述第一链路的PC5接口链路质量低于所述第一链路的PC5接口链路质量阈值；所述中继设备与所述基站之间的链路质量低于所述链路质量第三阈值；所述第一链路的PC5接口任一资源池信道忙闲率高于所述第一信道忙闲率阈值；所述第一链路的PC5接口所有资源池信道忙闲率的均值高于所述第二信道忙闲率阈值。
本实施例中，对于上述的情况2，在第二链路(PC5链路)的链路质量高于第二链路的链路质量第二阈值的情况下，可以切换至第二链路，其中，链路质量第二阈值可以包括一定迟滞值；在第一链路(Uu链路)的PC5接口链路质量低于第一链路的PC5接口链路质量阈值(例如UE1与中继设备之间的PC5接口链路质量低于该第一链路的PC5接口链路质量阈值)的情况下，可以切换至第二链路；在中继设备与基站之间的链路质量低于链路质量第三阈值的情况下，可以切换至第二链路，可选的，中继设备通过PC5 RRC信令消息将其与基站之间的链路质量告知UE1，或者将其与基站之间的链路质量等级指示(例如高于或低于链路质量第三阈值的指示、质量优、中、差等指示)告知UE1；在第一 链路的PC5接口资源池信道忙闲率(Channel Busy Rate，CBR)高于第一信道忙闲率阈值情况下，可以切换至第二链路；在第一链路的PC5接口所有资源池CBR的均值高于第二信道忙闲率阈值的情况下，可以切换至第二链路，例如，第一链路PC5接口资源池CBR或所有资源池CBR平均值高于阈值，表明中继传输的负荷渐大，可切换至直接与基站进行通信；在第一链路上的业务类型为第二预设业务类型(例如某些类型业务的数据需要通过Uu接口传输)的情况下，可以切换至第二链路。
本实施例中，Uu链路的链路质量为测量的Uu接口的参考信号接收功率(Reference Signal Receiving Power，RSRP)或参考信号接收质量(Reference Signal Receiving Quality，RSRQ)，PC5链路质量为测量的SL发现信道或通信信道的RSRP、RSRQ或接收信号强度指示(Received Signal Strength Indication，RSSI)。
在一实施例中，还包括：通过所述第二链路传输所述中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
本实施例中，对于上述的情况2，在链路切换过程中，从中继设备未确认接收到数据包开始，之后的数据包通过第二链路传输，从而保证业务服务的连续性。在UE1从中继通信链路切换到直接通信链路的情况下，中继协议栈为end-to-end PDCP以及hop-by-hop无线链路控制(radio link conrtol，RLC)。
图3为一实施例提供的上行数据包传输的示意图。以上行数据包(packet)传输为例，如图3所示，UE1已将packet 1,2,3,4递交到PC5接口传输给中继设备(relay 1)，PC5接口为RLC确认模式(AM模式)传输，并且UE1收到中继设备发送的packet 1,2,4确认接收指示以及packet 3未接收到的指示，如果在这种情况下执行链路切换，UE1执行PDCP数据发现(Data Recovery)，则从第一个中继设备未确认接收的包(packet 3)开始递交到Uu接口直接向基站(NW)传输；中继设备会继续将packet 1,2,4发送给基站，基站接收到中继设备转发的 packet 1,2,4以及UE1通过Uu接口发送的packet 3,4,5,6...，执行重复包检测，丢弃重复包(packet 4)，并执行PDCP重排序，从而将数据包按序递交给上层。
在一实施例中，还包括：接收所述基站发送的第一PDCP状态报告；根据所述第一PDCP状态报告，通过所述第二链路重传所述第一PDCP状态报告中指示的未成功接收的数据包和/或传输新传数据。
本实施例中，通过第一PDCP状态报告指示未成功接收的数据包，对这些数据包进行重传避免丢包，如果第一PDCP状态报告中不存在未成功接收的数据包，则可继续传输新船数据。
在一实施例中，还包括：接收中继设备的第一指示信息，所述第一指示信息包括以下至少之一：无线链路失败(Radio Link Failure，RLF)指示信息；第一目标数据包的序号；根据所述第一指示信息通过所述第二链路传输所述第一目标数据包；其中，所述第一目标数据包包括所述中继设备未转发给所述基站的数据包和/或所述基站未确认接收的数据包。
本实施例中，对于上述的情况2，在链路切换过程中，从中继设备未确认接收到数据包开始，之后的数据包通过第二链路传输，但是，如果在中继设备将packet 1发送给基站之后，中继设备与基站间的Uu链路质量突然变差或出现RLF，而packet 2,4尚缓存在中继设备而未发送给基站(如图3所示)，由于UE1是从packet 3开始递交到Uu接口传输，那么就会存在丢包，基站未能接收packet 2。这种情况下，本实施例采用如下方法保证链路切换时UE1与基站间的无损传输：
方法一：中继设备向基站发起RRC连接重建，重建成功后将packet 2继续发送给基站，这种情况下，RRC重建存在较大的延时或者可能重建失败。
方法二：当UE1向基站指示链路切换或基站决策并向UE1指示链路切换时，基站通过Uu接口发送针对上行数据的第一PDCP状态报告给UE1，UE1对第一PDCP状态报告中所指示的未确认接收的数据包进行重传，对于已经确认接收的 数据包不必重复发送，可继续传输新传数据。可选的，为了避免重复包传输，基站在发送第一PDCP状态报告后，可发起释放与中继设备的RRC连接，或指示中继设备不再转发UE1的数据包。
方法三：当中继设备检测到与基站之间的Uu接口出现RLF时，中继设备通过PC5 RRC消息发送指示信息给UE1，并告知中继设备处尚未转发给基站和或已转发但尚未收到基站发送的确认收到反馈指示的数据包的序号给UE1。在一些实施例中，中继设备发送给UE1的PC5 RRC消息的指示信息包括以下至少之一：RLF指示；尚未转发给基站的数据包的序号(PDCP SN)，例如可以为升序排列的最小PDCP SN或COUNT值；已转发但尚未收到基站发送的确认收到反馈指示的数据包的PDCP SN，例如可以为升序排列的最小PDCP SN或COUNT值，这种情况下，中继设备可识别PDCP包头中的PDCP SN。
在一实施例中，还包括：向所述基站发送第二PDCP状态报告；接收所述基站通过所述第二链路传输的新传数据和/或所述基站重传的第一终端未确认接收的数据包接收所述基站通过所述第二链路重传的所述第二PDCP状态报告中指示的未成功接收的数据包和/或传输的新传数据。
在一实施例中，还包括：接收所述基站传输的第二目标数据包；其中，所述第二目标数据包的序号由所述中继设备指示给所述基站；所述第二目标数据包包括所述中继设备未转发给所述第一终端的数据包的序号和/或所述第一终端未确认接收的数据包。
图4为一实施例提供的下行数据包传输的示意图。如图4所示，下行数据的传输也可能会出现丢包问题。在中继设备(relay 1)将packet 1发送给UE1之后，中继设备与UE1的PC5链路质量突然变差或出现RLF，而packet 2,4尚缓存在中继设备未发送给UE1，由于基站是从packet 3开始递交到Uu接口传输，那么就会存在丢包，UE1未能接收packet 2。这种情况下，本实施例采用如下方法保证链路切换时基站与UE1间的无损传输：
方法一：当UE1向基站指示链路切换或基站决策并向UE1指示链路切换时，UE1通过Uu接口发送针对下行数据的PDCP状态报告给基站，基站对PDCP状态报告中未确认接收的包进行重传，对于已经确认接收的包不必重复发送。
方法二：当中继设备检测到与UE1之间PC5接口出现RLF，中继设备通过RRC消息(如FailureInformation，或sidelinkUEInformation，或其它上行RRC消息)发送指示信息给基站，并告知中继设备处尚未转发给UE1和或已转发但尚未收到UE1发送的确认收到反馈指示的数据包的PDCP SN给基站。
图5为一实施例提供的链路切换的实现示意图。如图5所示，UE1已通过中继设备与基站建立RRC连接，并通过中继设备进行数据转发。基站通过RRC重配消息发送链路切换准则和/或测量配置给UE1(经中继设备转发)；UE1基于测量配置进行Uu接口测量以及PC5接口测量，并依据测量上报条件将测量结果报告给基站；基站基于UE1上报的测量结果信息，确定是否执行链路切换，若执行链路切换，则通过RRC重配消息发送链路切换配置信息(包括切换指示信息)给UE1(经中继设备转发或通过Uu接口直接发送)，在一些实施例中，链路切换配置信息可以包括以下至少之一：链路切换指示，切换的业务类型，切换的PDU会话标识ID，切换的DRB，切换的QoS流的信息，例如Qos流标识(QoS flow identifier，QFI)、第五代移动通信服务质量标识(5G QoS identifier，5QI)，DRB关联的Uu RLC承载配置信息，DRB PDCP重传指示，SRB关联的Uu RLC承载配置信息等。在一些实施例中，UE1可以根据测量结果及链路切换准则确定是否执行链路切换，若执行链路切换则发送链路切换通知给基站；基站通过RRC重配消息配置DRB关联的Uu RLC承载，可选的，包括DRB PDCP重传指示。在此基础上，基站可以向UE1发送第一PDCP状态报告，从而指示是否存在未确认接收的数据包，如果存在，则UE1重传这些数据包，如果不存在，UE1继续传输新传数据即可，从而保证无损传输。
在一实施例中，所述第一链路为通过第一中继设备与所述目标节点通信的链路，所述第二链路为通过第二中继设备与所述目标节点通信的链路，所述目 标节点为第二终端(记为UE2)。
图6为一实施例提供的切换与终端之间的通信链路的示意图。如图6所示，
UE1与UE2通过L2第一中继设备(relay 1)建立单播连接并进行数据转发，UE1与UE2之间维护端到端的PC5-S/PC5-RRC以及端到端的业务数据适配协议(Service Data Adaptation Protocol，SDAP)或PDCP，并通过与relay 1之间的PC5回传(Backhaul，BH)RLC承载进行数据转发。由于relay 1路径上的PC5链路质量变差(UE1与relay 1之间或relay 1与UE2之间)或负荷较大等问题，UE1或UE2重选了第二中继设备relay 2(relay UE2)进行数据转发。
在从relay 1的链路切换/更换到relay 2的链路过程中，如图6所示，UE1已将packet 1,2,3,4递交到PC5接口传输给relay 1，PC5接口为RLC AM模式传输，并且UE1收到relay 1发送的packet 1,2,4确认接收指示以及packet 3未接收到的指示，若此时执行链路切换，UE1可执行PDCP数据发现，从第一个未确认接收的包(即packet 3)开始递交到Uu接口传输；relay 1继续将packet 1,2,4发送给UE2，UE2接收relay 1转发的packet 1,2,4及UE1通过relay 2转发的packet 3,4,5,6...，UE2执行重复包检测，丢弃重复包packet 4，并执行PDCP重排序，将数据包按序递交给上层。
在一实施例中，所述链路切换准则包括以下至少之一：第一链路的链路质量第四阈值；第一中继设备的切换指示；所述第一中继设备与所述第二终端之间的链路状态指示；其中，所述链路状态指示包括以下至少之一：链接释放指示；无线链路失败指示；链路质量指示；链路拥塞指示。
本实施例中，第一链路的链路质量第四阈值是指第一终端与第一中继UE之间的PC5链路质量阈值。当UE1检测到与relay 1之间的PC5链路质量低于配置或预配置的第一链路的链路质量第四阈值，或UE1收到relay 1发送的L2链路释放消息或不再充当中继设备的指示，或UE1收到relay 1发送的关于relay 1与目标UE2之间的链路指示信息(如L2链接释放指示、RLF失败指示、链路 质量低于配置或预配置的阈值的指示或链路拥塞指示等)，UE1触发中继设备的重选。
在一实施例中，还包括：通过所述第二链路传输所述第一中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
本实施例中，对于重选中继设备的情况，在链路切换过程中，从第一中继设备未确认接收到数据包开始，之后的数据包通过第二链路传输，从而保证业务服务的连续性。
在一实施例中，还包括：接收所述第二终端发送的第三PDCP状态报告；
根据所述第三PDCP状态报告，通过所述第二链路重传所述第三PDCP状态报告中指示的所述第二终端未成功接收的数据包和/或传输新传数据。
在一实施例中，还包括：接收所述第一中继设备的第二指示信息，所述第二指示信息包括以下至少之一：RLF指示信息；第三目标数据包的序号；根据所述第二指示信息通过所述第二链路传输第三目标数据包，所述第三目标数据包包括所述第一中继设备未转发给所述第二终端的数据包和/或所述第二终端未确认接收的数据包。
在一实施例中，第四目标由所述第一中继设备通过第三链路将第四目标数据包转发至所述第二终端；所述第四目标数据包包括所述第一中继设备未转发给所述第二终端的数据包和/或所述第二终端未确认接收的数据包。
在一实施例中，还包括：接收所述第一中继设备发送的第一无线链路层控制协议RLC状态报告；根据所述第一RLC状态报告传输第五目标数据包；其中，所述第一RLC状态报告由所述第一中继设备基于所述第二终端发送至所述第一中继设备的第二RLC状态报告确定；所述第五目标数据包包括所述第一RLC状态报告中指示的未确认接收的数据包。
本实施例中，如图6所示，在relay 1将packet 1发送给UE2之后，relay 1与UE2之间的PC5链路质量突然变差或出现RLF，而packet 2,4尚缓存在relay  1未转发给UE2，由于UE1是从packet 3开始递交到relay 2传输，那么就会存在丢包，UE2未能接收packet 2。这种情况下，本实施例采用如下方法保证链路切换时UE1与UE2之间的无损传输：
方法一：当relay 2 link接通之后，UE2经relay 2发送第三PDCP状态报告给UE1，报告从packet 2开始未收到(packet 1已收到)；那么UE1基于第三PDCP状态报告，从packet 2开始通过relay 2的链路传输。可选的，为了避免重复包传输，UE2发送第三PDCP状态报告之后，可发起释放与relay 1的连接或指示relay 1不再转发UE1的数据。
方法二：当relay 1检测到与UE2之间的PC5链接断掉或发生RLF，relay 1通过PC5 RRC消息发送指示信息给UE1，告知与UE2之间的PC5 link发生了RLF，以及relay 1尚未转发和或已转发但尚未收到UE2发送的确认接收反馈指示的数据包的PDCP SN，UE1收到之后，从relay 1指示的PDCP SN开始通过relay 2 link传输。在一些实施例中，relay 1发送给UE1的PC5 RRC指示信息包括以下至少之一：PC5 RLF指示；尚未转发给第二终端(UE2)的数据包的PDCP SN，例如升序排列的最小PDCP SN或COUNT值；已转发但尚未收到基站发送的确认收到反馈指示的数据包的PDCP SN，例如升序排列的最小PDCP SN或COUNT值。这种情况下，第一中继设备可识别PDCP包头中的PDCP SN。
方法三：Relay 1寻找与UE2之间的其它路径，即第三链路，通过第三链路将缓存的数据继续转发给UE2。比如relay 1发现relay 3可连接到UE2，则relay 1将尚未转发和或已转发但尚未确认接收的数据包转发给relay 3，relay 3再转发给UE2；或者UE1将选择的relay 2通过PC5 RRC消息告知relay 1，relay 1尝试连接到relay 2，若可连接到relay 2，则可将尚未转发和或已转发但尚未确认接收的数据包发给relay 2转发给UE2。
方法四：UE1与UE2之间支持end-to-end RLC自动重传请求(Automatic Repeat-reQuest，ARQ)，PDCP层基于RLC的反馈(feedback)进行重传。例 如，relay 1在收到UE1发送的packet 1,2,4(packet 3暂未收到)之后，先不发送RLC确认信息(Acknowledgement，ACK)或非确认信息(Negative-Acknowledgment，NACK)的反馈信息给UE1，而是将数据包转发给UE2，并且收到UE2发送的RLC ACK/NACK反馈信息之后，再发送RLC ACK/NACK反馈信息给UE1，如果relay 1在一定时间内或链路发生RLF前未收到已转发数据包的确认接收指示，则relay 1发送给UE1的RLC ACK/NACK反馈信息包含最后一个被UE2确认接收的数据包及之前尚未确认接收的数据包。由于relay 1在转发数据包时会对接收的数据包重新打包RLC SN，该方式需要relay 1保存接收(Ingress Link)数据包的RLC SN与转发(Egress Link)时重新打包的RLC SN之间的映射关系，从而relay 1基于Egress Link上的确认接收的RLC SN反推Ingress Link上RLC SN，进而在Ingress Link上向UE1反馈RLC ACK/NACK。
图7为另一实施例提供的链路切换的实现示意图。如图7所示，UE1重选第二中继设备，并与第二中继设备建立L2 link连接，可选的，第二中继设备与UE2建立/更新L2 link；UE1与第二中继设备交互用于数据转发的PC5 BH RLC承载配置，以及UE1与UE2之间end-to-end旁路承载(Sidelink radio bearer，SLRB)与the new PC5 BH RLC承载的映射关系。可选的，UE1将end-to-end SLRB QoS携带在PC5 RRC消息中告知第二中继设备；第二中继设备与UE2交互用于数据转发的PC5 BH RLC承载配置，UE1、第二中继设备、UE2基于配置信息建立PC5 BH RLC承载。UE2经第二中继设备发送第三PDCP状态报告给UE1(例如，报告从packet 2开始未收到(packet 1已收到)；UE1基于第三PDCP状态报告进行重传，从UE2尚未确认接收的数据包(如packet 2)开始通过第二中继设备链路传输，从而保证链路切换过程中的无损传输与服务连续性。
在一实施例中，还包括：向所述目标节点报告链路切换通知信息；
所述链路切换通知信息包括以下至少之一：链路切换指示；切换的业务类型；切换的PDU会话标识；切换的DRB；切换的QoS流信息；与DRB关联的 RLC承载配置信息；中继设备标识。
本实施例中，UE1切换链路后通知基站，向基站上报的路切换通知信息。
在一实施例中，在由所述第一链路切换至所述第二链路之前，还包括：获取所述中继设备的服务小区信息，所述服务小区信息包括以下至少之一：演进的UMTS陆地无线接入网(Evolution UMTS Terrestrial Radio Access Network，E-UTRAN)小区全局标识符(Cell Global Identifier，ECGI)；新空口小区全局标识(New Radio Cell Global Identifier，NCGI)；基站(gNB)标识；全球基站(gNB)标识；单网络切片选择辅助信息(Single Network Slice Selection Assistance information，S-NSSAI)。
在一实施例中，还包括：在由所述第一链路切换至所述第二链路之前，还包括：向所述目标节点上报中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
在一实施例中，所述第一链路为直接与所述目标节点通信的链路，所述目标节点为源基站；所述第二链路为通过中继设备与目标基站通信的链路。
在一实施例中，所述源基站用于向所述目标基站发送切换请求消息；
所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识(Cell Radio Network Temporary Identifier，C-RNTI)，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
在一实施例中，所述目标基站还用于向核心网网元发送链路切换请求，并指示所述中继设备与第一终端的关系；所述链路切换请求包括以下至少之一：中继设备标识；中继设备指示；第一终端标识。
本实施例中，中继设备标识是指中继设备为中继UE L2的ID标识；中继设备指示是指第一终端自身为中继UE。
图8为又一实施例提供的链路切换的实现示意图。如图8所示，UE1连接到基站1(源基站)，通过Uu口与源基站通信；当UE1的Uu链路质量变差，UE1发现中继设备并选择中继设备，通过该中继设备与网络通信，其中，中继设备的基站与UE1的基站不同，中继设备与目标基站连接。
如图8所示，由源基站的通信链路切换至于目标基站的链路的过程如下：
步骤1：UE1接收源基站发送的RRC重配和/或测量配置信息；其中，测量配置信息包括Uu口测量配置和或Sidelink测量配置(或称为PC5/relay测量配置)，Sidelink测量配置包括以下至少之一：中继(relay)测量指示，PC5接口RSRP，PC5接口RSRQ，PC5接口RSSI，测量信息；其中测量信息包括：PC5RSRP/RSRQ/RSSI测量值，中继设备标识，中继设备服务小区标识。
步骤2：UE1发现并测量与中继设备之间的PC5链路质量；UE1获得中继设备服务小区信息，包括以下任意信息：ECGI，NCGI，gNB标识，全球gNB标识，S-NSSAI；其中，UE1可通过发现广告消息或发现接收消息或发现附加消息中接收中继设备发送的服务小区信息。
步骤3：UE1根据测量配置将测量结果信息上报基站，其中测量结果信息包括以下至少之一：PC5 RSRP、PC5 RSRQ、PC5 RSSI测量值，中继设备标识，中继设备服务小区信息，源基站接收测量结果信息，并进行测量判决，决定切换到中继设备的通信链路。
步骤4：源基站向目标基站(即中继设备的服务基站)发送切换请求消息，包括以下至少之一：中继设备标识，中继设备C-RNTI，QoS流与DRB的映射，QoS flow服务质量参数；中继设备指示；其中中继设备标识(remote UE标识或relay标识)为UE L2 ID。
步骤5：目标基站通知中继设备为UE1进行数据转发，具体地，包含以下至少之一：中继转发指示，UE1标识，Uu中继转发承载(Relay BH Bearer)配置，SL BH bearer配置；中继设备建立中继转发承载并回复响应消息。
步骤6：目标基站向源基站发送切换响应消息，其中切换命令包括以下至少之一：SL BH bearer配置、Uu DRB与SL BH bearer的映射关系。
步骤7：源基站接收切换响应消息，并将其中的切换命令转发给UE1。可选的，UE1与中继设备通过PC5 RRC信令交互SL BH bearer配置。
步骤8：序列号状态切换，即数据包序号的转换。
步骤9：UE1执行配置并通过中继设备接入到目标基站后发送重配完成消息给目标基站。
步骤10：目标基站发送链路切换请求给核心网网元(如接入和移动性管理功能单元(Access and Mobility Management Function，AMF))并指示中继设备与UE1的关系，即其中链路切换请求消息中包含：中继设备标识、中继设备指示和/或UE1的标识。目标基站接收链路切换响应消息。
步骤11：完成链路切换后，目标基站通知源基站释放UE1上下文信息。继而，UE1通过中继设备与网络进行通信。
本实施例的链路切换方法，实现了直接通信链路与中继通信链路之间的切换、中继设备的重选，以及从源基站到目标基站的通信链路的切换，能够灵活适应各种实际网络状态保证业务服务的连续性；并且通过处理丢包数据保证第一终端与目标节点之间的数据无损传输，提高无线通信质量和可靠性。
本申请实施例还提供一种链路切换配置方法。基站通过向第一终端发送链路切换配置信息，指示第一终端进行链路切换，在此基础上与第一终端传输数据，能够灵活适应各种实际网络状态保证业务服务的连续性。
图9为一实施例提供的一种链路切换配置方法的流程图。本实施例的链路切换配置方法可应用于基站，所述基站执行的操作与上述实施例中应用于第一终端的链路切换方法相对应，未在以下实施例中详尽描述的技术细节可参加上述任意实施例。
如图9所示，本实施例提供的方法包括步骤210和步骤220。
在步骤210中，向第一终端发送链路切换配置信息。
在步骤220中，与所述第一终端传输数据。
在一实施例中，所述链路切换配置信息包括以下至少之一：链路切换准则；切换指示信息；
所述切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元PDU会话标识；切换的数据无线承载DRB；切换的服务质量QoS流信息；DRB PDCP重传指示。
在一实施例中，所述与所述第一终端传输数据，包括：
通过第二链路传输中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
在一实施例中，还包括：
发送第一PDCP状态报告；
接收新所述第一PDCP状态报告中指示的未成功接收的数据包和/或新传数据。
在一实施例中，还包括：
接收第二PDCP状态报告；
根据所述第二PDCP状态报告传输新传数据和/或重传所述第二状态报告中指示未成功接收的数据包。
在一实施例中，还包括：
接收中继设备的第一指示信息，所述第一指示信息包括以下至少之一：RLF指示信息；所述第一目标数据包的序号；
通过所述第二链路接收所述第一目标数据包；
其中，所述第一目标数据包包括所述中继设备未转发给基站的数据包和/或基站未确认接收的数据包。
在一实施例中，还包括：
发送第二目标数据包，其中，所述第二目标数据包的序号由中继设备指示；
所述第二目标数据包包括所述中继设备未转发给所述第一终端的数据包的序号和/或所述第一终端未确认接收的数据包。
在一实施例中，还包括：
接收中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；
所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
在一实施例中，还包括：
向目标基站发送切换请求消息；
所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识C-RNTI，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
本申请实施例还提供一种链路切换装置。图10为一实施例提供的一种链路切换装置的结构示意图。如图10所示，所述链路切换装置包括：配置信息接收模块310和链路切换模块320。
配置信息接收模块310，设置为接收链路切换配置信息；
链路切换模块320，设置为根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。
本实施例的链路切换装置，根据链路切换配置信息进行链路切换，灵活适 应实际网络情况，保证业务服务的连续性，提高通信链路的可靠性。
在一实施例中，所述链路切换配置信息包括链路切换准则和切换指示信息中的至少之一。
在一实施例中，所述链路切换模块320，具体设置为以下至少之一：
在满足链路切换准则的情况下通知所述目标节点，并根据所述目标节点配置的切换指示信息由所述第一链路切换至第二链路；
根据所述目标节点配置的切换指示信息由所述第一链路切换至第二链路；
在满足链路切换准则的情况下由所述第一链路切换至第二链路。
在一实施例中，切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元PDU会话标识；切换的数据无线承载DRB；切换的服务质量QoS流信息；DRB PDCP重传指示。
在一实施例中，所述第一链路为直接与所述目标节点通信的链路，所述第二链路为通过中继设备与所述目标节点通信的链路，所述目标节点为基站；
所述链路切换准则包括以下至少之一：第一链路的链路质量第一阈值；第一预设业务类型；第二链路的PC5接口链路质量阈值。
在一实施例中，在满足以下至少之一的情况下，满足所述链路切换准则：
所述第一链路的链路质量低于所述链路质量第一阈值；
所述第一链路的业务类型为第一预设业务类型；
所述第二链路的PC5接口链路质量高于所述第二链路的PC5接口链路质量阈值。
在一实施例中，所述第一链路为通过中继设备与所述目标节点通信的链路，所述第二链路为直接与所述目标节点通信的链路，所述目标节点为基站。
在一实施例中，所述链路切换准则包括以下至少之一：第二链路的链路质 量第二阈值；第一链路的PC5接口链路质量阈值；中继设备与基站的链路质量第三阈值；第一信道忙闲率阈值；第二信道忙闲率阈值。
在一实施例中，在满足以下至少之一的情况下，满足所述链路切换准则：所述第二链路的链路质量高于所述链路质量第二阈值；所述第一链路的PC5接口链路质量低于所述第一链路的PC5接口链路质量阈值；所述中继设备与所述基站之间的链路质量低于所述链路质量第三阈值；所述第一链路的PC5接口任一资源池信道忙闲率高于所述第一信道忙闲率阈值；所述第一链路的PC5接口所有资源池信道忙闲率的均值高于所述第二信道忙闲率阈值。
在一实施例中，还包括：
第一包传输模块，设置为通过所述第二链路传输所述中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
在一实施例中，还包括：
第一报告模块，设置为接收所述基站发送的第一分组数据汇聚协议PDCP状态报告；
第一传输模块，设置为根据所述第一PDCP状态报告，通过所述第二链路重传所述第一PDCP状态报告中指示的所述基站未成功接收的数据包和/或传输新传数据。
在一实施例中，还包括：
第一指示模块，设置为接收中继设备的第一指示信息，所述第一指示信息包括以下至少之一：无线链路失败RLF指示信息；第一目标数据包的序号；
第二传输模块，设置为根据所述第一指示信息通过所述第二链路传输所述第一目标数据包；
其中，所述第一目标数据包包括所述中继设备未转发给所述基站的数据包和/或所述基站未确认接收的数据包。
在一实施例中，还包括：
第二报告模块，设置为向所述基站发送第二PDCP状态报告；
第三传输模块，设置为接收所述基站通过所述第二链路重传的所述第二PDCP状态报告中指示的未成功接收的数据包和/或传输的新传数据。
在一实施例中，还包括：
第四传输模块，设置为接收所述基站传输的第二目标数据包；
其中，所述第二目标数据包的序号由所述中继设备指示给所述基站；
所述第二目标数据包包括所述中继设备未转发给所述第一终端的数据包的序号和/或所述第一终端未确认接收的数据包。
在一实施例中，所述第一链路为通过第一中继设备与所述目标节点通信的链路，所述第二链路为通过第二中继设备与所述目标节点通信的链路，所述目标节点为第二终端。
在一实施例中，还包括：
第二包传输模块，通过所述第二链路传输所述第一中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
在一实施例中，还包括：
第三报告模块，设置为接收所述第二终端发送的第三PDCP状态报告；
第五传输模块，设置为根据所述第三PDCP状态报告，通过所述第二链路重传所述第三PDCP状态报告中指示的所述第二终端未成功接收的数据包和/或传输新传数据。
在一实施例中，还包括：
第二指示模块，设置为接收所述第一中继设备的第二指示信息，所述第二指示信息包括以下至少之一：RLF指示信息；第三目标数据包的序号；
第六传输模块，设置为根据所述第二指示信息通过所述第二链路传输第三目标数据包，所述第三目标数据包包括所述第一中继设备未转发给所述第二终端的数据包和/或所述第二终端未确认接收的数据包。
在一实施例中，第四目标由所述第一中继设备通过第三链路将第四目标数据包转发至所述第二终端；
所述第四目标数据包包括所述第一中继设备未转发给所述第二终端的数据包和/或所述第二终端未确认接收的数据包。
在一实施例中，还包括：
报告接收模块，设置为接收所述第一中继设备发送的第一无线链路层控制协议RLC状态报告；
第七传输模块，设置为根据所述第一RLC状态报告传输第五目标数据包；
其中，所述第一RLC状态报告由所述第一中继设备基于所述第二终端发送至所述第一中继设备的第二RLC状态报告确定；所述第五目标数据包包括所述第一RLC状态报告中指示的未确认接收的数据包。
在一实施例中，所述链路切换准则包括以下至少之一：第一链路的链路质量第四阈值；第一中继设备的切换指示；所述第一中继设备与所述第二终端之间的链路状态指示；其中，所述链路状态指示包括以下至少之一：链接释放指示；无线链路失败指示；链路质量指示；链路拥塞指示。
在一实施例中，还包括：
通知模块，设置为向所述目标节点报告链路切换通知信息；
所述链路切换通知信息包括以下至少之一：链路切换指示；切换的业务类型；切换的PDU会话标识；切换的DRB；切换的QoS流信息；与DRB关联的RLC承载配置信息；中继设备标识。
在一实施例中，所述第一链路为直接与所述目标节点通信的链路，所述目 标节点为源基站；
所述第二链路为通过中继设备与目标基站通信的链路。
在一实施例中，还包括：
获取模块，设置为在由所述第一链路切换至所述第二链路之前，获取所述中继设备的服务小区信息，所述服务小区信息包括以下至少之一：E-UTRAN小区全局标识符ECGI；新空口小区全局标识NCGI；基站标识；全球基站标识；单网络切片选择辅助信息S-NSSAI。
在一实施例中，还包括：
上报模块，设置为在由所述第一链路切换至所述第二链路之前，，向所述源基站上报中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；
所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
在一实施例中，所述源基站用于向所述目标基站发送切换请求消息；
所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识C-RNTI，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
在一实施例中，所述目标基站还用于向核心网网元发送链路切换请求，并指示所述中继设备与第一终端的关系；
所述链路切换请求包括以下至少之一：中继设备标识；中继设备指示；第一终端标识。
本实施例提出的链路切换装置与上述实施例提出的链路切换方法属于同一发明构思，未在本实施例中详尽描述的技术细节可参见上述任意实施例，并且本实施例具备与执行链路切换方法相同的有益效果。
本申请实施例还提供一种链路切换配置装置。图11为一实施例提供的一种链路切换配置装置的结构示意图。如图11所示，所述链路切换装置包括：配置信息发送模块410和数据传输模块420。
配置信息发送模块410，设置为向第一终端发送链路切换配置信息；
数据传输模块420，设置为与所述第一终端传输数据。
本实施例的链路切换配置装置，通过向第一终端发送链路切换配置信息，指示第一终端进行链路切换，在此基础上与第一终端传输数据，能够灵活适应各种实际网络状态保证业务服务的连续性。
在一实施例中，所述链路切换配置信息包括以下至少之一：链路切换准则；切换指示信息；
所述切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元PDU会话标识；切换的数据无线承载DRB；切换的服务质量QoS流信息；DRB PDCP重传指示。
在一实施例中，所述数据传输模块420，具体设置为：
通过第二链路传输中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
在一实施例中，还包括：
报告发送模块，设置为发送第一PDCP状态报告；
包接收模块，设置为接收所述第一PDCP状态报告中指示的未成功接收的数据包和/或新传数据。
在一实施例中，还包括：
报告接收模块，设置为接收第二PDCP状态报告；
包发送模块，设置为根据所述第二PDCP状态报告传输新传数据和/或重传 所述第二状态报告中指示未成功接收的数据包。
在一实施例中，还包括：
指示信息接收模块，设置为接收中继设备的第一指示信息，所述第一指示信息包括以下至少之一：RLF指示信息；所述第一目标数据包的序号；
第八传输模块，设置为通过所述第二链路接收所述第一目标数据包；
其中，所述第一目标数据包包括所述中继设备未转发给基站的数据包和/或基站未确认接收的数据包。
在一实施例中，还包括：
第九传输模块，设置为发送第二目标数据包，其中，所述第二目标数据包的序号由中继设备指示；
所述第二目标数据包包括所述中继设备未转发给所述第一终端的数据包的序号和/或所述第一终端未确认接收的数据包。
在一实施例中，还包括：
相关信息接收模块，设置为接收中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；
所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
在一实施例中，还包括：
请求模块，设置为向目标基站发送切换请求消息；
所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识C-RNTI，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
本实施例提出的链路切换配置装置与上述实施例提出的链路切换配置方法属于同一发明构思，未在本实施例中详尽描述的技术细节可参见上述任意实施例，并且本实施例具备与执行链路切换配置方法相同的有益效果。
本申请实施例还提供一种通信节点。所述链路切换方法可以由链路切换装置执行，该链路切换装置可以通过软件和/或硬件的方式实现，并集成在所述通信节点中，所述通信节点为基站。或者，所述链路切换配置方法可以由链路切换配置装置执行，该链路切换配置装置可以通过软件和/或硬件的方式实现，并集成在所述通信节点中，所述通信节点为终端。
图12为一实施例提供的一种通信节点的硬件结构示意图。如图12所示，本实施例提供的一种通信节点，包括：处理器510和存储装置520。该通信节点中的处理器可以是一个或多个，图12中以一个处理器510为例，所述设备中的处理器510和存储装置520可以通过总线或其他方式连接，图12中以通过总线连接为例。
所述一个或多个程序被所述一个或多个处理器510执行，使得所述一个或多个处理器实现上述任一实施例所述的链路切换方法或链路切换配置方法。
该通信节点中的存储装置520作为一种计算机可读存储介质，可用于存储一个或多个程序，所述程序可以是软件程序、计算机可执行程序以及模块，如本发明实施例中链路切换方法对应的程序指令/模块(例如，附图10所示的链路切换装置中的模块，包括：配置信息接收模块310和链路切换模块320)。处理器510通过运行存储在存储装置520中的软件程序、指令以及模块，从而执行通信节点的各种功能应用以及数据处理，即实现上述方法实施例中的链路切换方法或链路切换配置方法。
存储装置520主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据设备的使 用所创建的数据等(如上述实施例中的链路切换配置信息、数据包等)。此外，存储装置520可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实例中，存储装置520可进一步包括相对于处理器510远程设置的存储器，这些远程存储器可以通过网络连接至通信节点。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
并且，当上述通信节点中所包括一个或者多个程序被所述一个或者多个处理器510执行时，实现如下操作：接收链路切换配置信息；根据所述链路切换配置信息由与目标节点通信的第一链路切换至第二链路。
或者，当上述通信节点中所包括一个或者多个程序被所述一个或者多个处理器510执行时，实现如下操作：发送链路切换配置信息；
通过与终端之间的通信链路与所述终端传输数据。
本实施例提出的通信节点与上述实施例提出的链路切换方法或链路切换配置方法属于同一发明构思，未在本实施例中详尽描述的技术细节可参见上述任意实施例，并且本实施例具备与执行链路切换方法或链路切换配置方法相同的有益效果。
本申请实施例还提供一种包含计算机可执行指令的存储介质，计算机可执行指令在由计算机处理器执行时用于执行一种链路切换方法或链路切换配置方法。
通过以上关于实施方式的描述，所属领域的技术人员可以了解到，本申请可借助软件及通用硬件来实现，也可以通过硬件实现。基于这样的理解，本申请的技术方案可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如计算机的软盘、只读存储器(Read-Only Memory,ROM)、随机存取存储器(Random Access Memory,RAM)、闪存(FLASH)、硬盘或光盘等，包括多个指令用以使得一台计算机设备(可以是个人计算机， 服务器，或者网络设备等)执行本申请任意实施例所述的方法。
以上所述，仅为本申请的示例性实施例而已，并非用于限定本申请的保护范围。
本申请附图中的任何逻辑流程的框图可以表示程序步骤，或者可以表示相互连接的逻辑电路、模块和功能，或者可以表示程序步骤与逻辑电路、模块和功能的组合。计算机程序可以存储在存储器上。存储器可以具有任何适合于本地技术环境的类型并且可以使用任何适合的数据存储技术实现，例如但不限于只读存储器(ROM)、随机访问存储器(RAM)、光存储器装置和系统(数码多功能光碟DVD或CD光盘)等。计算机可读介质可以包括非瞬时性存储介质。数据处理器可以是任何适合于本地技术环境的类型，例如但不限于通用计算机、专用计算机、微处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、可编程逻辑器件(FGPA)以及基于多核处理器架构的处理器。
通过示范性和非限制性的示例，上文已提供了对本申请的示范实施例的详细描述。但结合附图和权利要求来考虑，对以上实施例的多种修改和调整对本领域技术人员来说是显而易见的，但不偏离本申请的范围。因此，本申请的恰当范围将根据权利要求确定。

Claims (37)

  1. 一种链路切换方法，应用于第一终端，包括：
    接收链路切换配置信息；
    根据所述链路切换配置信息，将与目标节点的通信链路由第一链路切换至第二链路。
  2. 根据权利要求1所述的方法，其中，
    所述链路切换配置信息包括链路切换准则和切换指示信息中的至少之一。
  3. 根据权利要求2所述的方法，其中，
    所述根据所述链路切换配置信息，将与目标节点的通信链路由第一链路切换至第二链路，包括下述之一：
    在满足链路切换准则的情况下通知所述目标节点，并根据所述目标节点配置的切换指示信息由所述第一链路切换至第二链路；
    根据所述目标节点配置的切换指示信息由所述第一链路切换至第二链路；
    在满足链路切换准则的情况下由所述第一链路切换至第二链路。
  4. 根据权利要求2所述的方法，其中，切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元PDU会话标识；切换的数据无线承载DRB；切换的服务质量QoS流信息；DRB分组数据汇聚协议PDCP重传指示。
  5. 根据权利要求2所述的方法，其中，所述第一链路为直接与所述目标节点通信的链路，所述第二链路为通过中继设备与所述目标节点通信的链路，所述目标节点为基站；
    所述链路切换准则包括以下至少之一：第一链路的链路质量第一阈值；第一预设业务类型；第二链路的PC5接口链路质量阈值。
  6. 根据权利要求5所述的方法，其中，满足所述链路切换准则包括以下至少之一：
    所述第一链路的链路质量低于所述链路质量第一阈值；
    所述第一链路的业务类型为第一预设业务类型；
    所述第二链路的PC5接口链路质量高于所述第二链路的PC5接口链路质量阈值。
  7. 根据权利要求2所述的方法，其中，所述第一链路为通过中继设备与所述目标节点通信的链路，所述第二链路为直接与所述目标节点通信的链路，所述目标节点为基站。
  8. 根据权利要求7所述的方法，其中，所述链路切换准则包括以下至少之一：第二链路的链路质量第二阈值；第一链路的PC5接口链路质量阈值；中继设备与基站的链路质量第三阈值；第一信道忙闲率阈值；第二信道忙闲率阈值。
  9. 根据权利要求8所述的方法，其中，满足所述链路切换准则包括以下至少之一：
    所述第二链路的链路质量高于所述链路质量第二阈值；
    所述第一链路的PC5接口链路质量低于所述第一链路的PC5接口链路质量阈值；
    所述中继设备与所述基站之间的链路质量低于所述链路质量第三阈值；
    所述第一链路的PC5接口任一资源池信道忙闲率高于所述第一信道忙闲率阈值；
    所述第一链路的PC5接口所有资源池信道忙闲率的均值高于所述第二信道忙闲率阈值。
  10. 根据权利要求7所述的方法，还包括：
    通过所述第二链路传输所述中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
  11. 根据权利要求7所述的方法，还包括：
    接收所述基站发送的第一分组数据汇聚协议PDCP状态报告；
    根据所述第一PDCP状态报告，通过所述第二链路执行以下至少之一：重传所述第一PDCP状态报告中指示的未成功接收的数据包；传输新传数据。
  12. 根据权利要求7所述的方法，还包括：
    接收中继设备的第一指示信息，所述第一指示信息包括以下至少之一：无线链路失败RLF指示信息；第一目标数据包的序号；
    根据所述第一指示信息通过所述第二链路传输所述第一目标数据包；
    其中，所述第一目标数据包包括以下至少之一：所述中继设备未转发给所述基站的数据包；所述基站未确认接收的数据包。
  13. 根据权利要求7所述的方法，还包括：
    向所述基站发送第二PDCP状态报告；
    接收以下至少之一：所述基站通过所述第二链路重传的所述第二PDCP状态报告中指示的未成功接收的数据包；所述基站通过所述第二链路传输的新传数据。
  14. 根据权利要求7所述的方法，还包括：
    接收所述基站传输的第二目标数据包；
    其中，所述第二目标数据包的序号由所述中继设备指示给所述基站；
    所述第二目标数据包包括以下至少之一：所述中继设备未转发给所述第一终端的数据包的序号；所述第一终端未确认接收的数据包。
  15. 根据权利要求2所述的方法，其中，所述第一链路为通过第一中继设备与所述目标节点通信的链路，所述第二链路为通过第二中继设备与所述目标节点通信的链路，所述目标节点为第二终端。
  16. 根据权利要求15所述的方法，还包括：
    通过所述第二链路传输所述第一中继设备未确认接收的首个数据包以及所述首个数据包之后的数据包。
  17. 根据权利要求15所述的方法，还包括：
    接收所述第二终端发送的第三PDCP状态报告；
    根据所述第三PDCP状态报告，通过所述第二链路执行以下至少之一：重传所述第三PDCP状态报告中指示的未成功接收的数据包；传输新传数据。
  18. 根据权利要求15所述的方法，还包括：
    接收所述第一中继设备的第二指示信息，所述第二指示信息包括以下至少之一：RLF指示信息；第三目标数据包的序号；
    根据所述第二指示信息通过所述第二链路传输第三目标数据包，所述第三目标数据包包括以下至少之一：所述第一中继设备未转发给所述第二终端的数据包；所述第二终端未确认接收的数据包。
  19. 根据权利要求15所述的方法，其中，由所述第一中继设备通过第三链路将第四目标数据包转发至所述第二终端；
    所述第四目标数据包包括以下至少之一：所述第一中继设备未转发给所述第二终端的数据包；所述第二终端未确认接收的数据包。
  20. 根据权利要求15所述的方法，还包括：
    接收所述第一中继设备发送的第一无线链路层控制协议RLC状态报告；
    根据所述第一RLC状态报告传输第五目标数据包；
    其中，所述第一RLC状态报告由所述第一中继设备基于所述第二终端发送至所述第一中继设备的第二RLC状态报告确定；所述第五目标数据包包括所述第一RLC状态报告中指示的未确认接收的数据包。
  21. 根据权利要求15所述的方法，其中，所述链路切换准则包括以下至少之一：第一链路的链路质量第四阈值；第一中继设备的切换指示；所述第一中继设备与所述第二终端之间的链路状态指示；
    其中，所述链路状态指示包括以下至少之一：链接释放指示；无线链路失败指示；链路质量指示；链路拥塞指示。
  22. 根据权利要求1所述的方法，还包括：
    向所述目标节点报告链路切换通知信息；
    所述链路切换通知信息包括以下至少之一：链路切换指示；切换的业务类型；切换的PDU会话标识；切换的DRB；切换的QoS流信息；与DRB关联的RLC承载配置信息；中继设备标识。
  23. 根据权利要求1所述的方法，在由所述第一链路切换至所述第二链路 之前，还包括：
    获取中继设备的服务小区信息，所述服务小区信息包括以下至少之一：演进的UMTS陆地无线接入网E-UTRAN小区全局标识符ECGI；新空口小区全局标识NCGI；基站标识；全球基站标识；单网络切片选择辅助信息S-NSSAI。
  24. 根据权利要求1所述的方法，在由所述第一链路切换至所述第二链路之前，还包括：
    向所述目标节点上报中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；
    所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
  25. 根据权利要求1所述的方法，其中，所述第一链路为直接与所述目标节点通信的链路，所述目标节点为源基站；
    所述第二链路为通过中继设备与目标基站通信的链路。
  26. 根据权利要求25所述的方法，其中，所述源基站设置为向所述目标基站发送切换请求消息；
    所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识C-RNTI，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
  27. 根据权利要求25所述的方法，其中，所述目标基站还设置为向核心网网元发送链路切换请求，并指示所述中继设备与第一终端的关系；
    所述链路切换请求包括以下至少之一：中继设备标识；中继设备指示；第一终端标识。
  28. 一种链路切换配置方法，应用于基站，包括：
    向第一终端发送链路切换配置信息；
    与所述第一终端传输数据。
  29. 根据权利要求28所述的方法，其中，所述链路切换配置信息包括以下至少之一：链路切换准则；切换指示信息；
    所述切换指示信息包括以下至少之一：切换指示；中继设备标识；切换的业务类型；切换的协议数据单元PDU会话标识；切换的数据无线承载DRB；切换的服务质量QoS流信息；DRB分组数据汇聚协议PDCP重传指示。
  30. 根据权利要求28所述的方法，还包括：
    发送第一PDCP状态报告；
    接收以下至少之一：所述第一PDCP状态报告中指示的未成功接收的数据包；新传数据。
  31. 根据权利要求28所述的方法，还包括：
    接收第二PDCP状态报告；
    根据所述第二PDCP状态报告，执行以下至少之一：传输新传数据；重传所述第二状态报告中指示的未成功接收的数据包。
  32. 根据权利要求28所述的方法，还包括：
    接收中继设备相关信息，所述中继设备相关信息包括以下至少之一：中继设备标识；中继设备的服务小区信息；对所述中继设备的测量信息；
    所述测量信息包括以下至少之一：PC5参考信号接收功率RSRP；PC5参考信号接收质量RSRQ，PC5接收信号强度指示RSSI。
  33. 根据权利要求28所述的方法，还包括：
    向目标基站发送切换请求消息；
    所述切换请求消息包括以下至少之一：第一终端标识；第一终端小区无线网络临时标识C-RNTI，QoS流与DRB的映射，QoS流服务质量参数；中继设备标识。
  34. 一种链路切换装置，包括：
    配置信息接收模块，设置为接收链路切换配置信息；
    链路切换模块，设置为根据所述链路切换配置信息，将与目标节点的通信 链路由第一链路切换至第二链路。
  35. 一种链路切换配置装置，包括：
    配置信息发送模块，设置为向第一终端发送链路切换配置信息；
    数据传输模块，设置为通过与所述第一终端之间的通信链路与所述第一终端传输数据。
  36. 一种通信节点，包括：
    至少一个处理器；
    存储装置，设置为存储至少一个程序；
    当所述至少一个程序被所述至少一个处理器执行，使得所述至少一个处理器实现如权利要求1-27中任一所述的链路切换方法或如权利要求28-33中任一所述的链路配置切换方法。
  37. 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1-27中任一所述的链路切换方法或如权利要求28-33中任一所述的链路切换配置方法。
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