WO2023160706A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2023160706A1
WO2023160706A1 PCT/CN2023/078476 CN2023078476W WO2023160706A1 WO 2023160706 A1 WO2023160706 A1 WO 2023160706A1 CN 2023078476 W CN2023078476 W CN 2023078476W WO 2023160706 A1 WO2023160706 A1 WO 2023160706A1
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WO
WIPO (PCT)
Prior art keywords
cell
terminal device
information
radio link
link quality
Prior art date
Application number
PCT/CN2023/078476
Other languages
English (en)
French (fr)
Inventor
娄崇
徐小英
顾志方
范强
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023160706A1 publication Critical patent/WO2023160706A1/zh

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure

Definitions

  • the present application relates to the technical field of communication, and in particular to a communication method and device.
  • the quality of the wireless link directly determines the capability of data transmission. Therefore, when the terminal device detects a problem with the wireless link, how to restore the wireless link still needs further research.
  • the present application provides a communication method and device, which are used for quickly restoring a wireless link after a terminal device detects a problem with the wireless link.
  • the embodiment of the present application provides a communication method, which can be applied to a terminal device or a module in the terminal device.
  • the terminal device is on the first cell receiving configuration information of at least one candidate cell from an access network device; when the wireless link of the first cell satisfies a first condition (that is, there is a problem with the wireless link of the first cell), select a second cell; if the If the second cell belongs to the at least one candidate cell, switch from the first cell to the second cell, and according to the configuration information of the second cell received on the first cell, in the communicate with the access network device on the second cell; or, if the second cell does not belong to the at least one candidate cell, perform RRC reestablishment to access the second cell.
  • a first condition that is, there is a problem with the wireless link of the first cell
  • the terminal device when the terminal device detects that there is a problem with the wireless link of the current serving cell, the terminal device may not release the configuration information of at least one candidate cell. Therefore, when the terminal device selects one of the candidate cells as the new serving cell, the terminal The device can communicate with the access network device according to the configuration information of the new serving cell, without the need for the access network device to resend the configuration information of the new serving cell to the terminal device, thereby effectively saving transmission resources and quickly restoring the wireless link.
  • the radio link quality of the first cell satisfies a first condition, including at least one of the following: the radio link quality of the first cell is less than a first threshold; The wireless link quality is less than the first threshold within the first time window; the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to a second threshold; the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to After the second threshold, a timer is started, and no synchronization indication is detected within a timing window of the timer; a radio link failure RLF occurs in the first cell.
  • a first condition including at least one of the following: the radio link quality of the first cell is less than a first threshold; The wireless link quality is less than the first threshold within the first time window; the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to a second threshold; the number of times the terminal device continuously detects an out-of-sync
  • the method further includes: receiving first information from the access network device on the first cell, where the first information is used to configure the first condition.
  • the radio link quality of the second cell satisfies a second condition;
  • the radio link quality meets the second condition, including at least one of the following: the radio link quality of the second cell is greater than or equal to a third threshold; the radio link quality of the second cell is greater than or equal to the third threshold within the second time window.
  • the radio link quality of the second cell is greater than or equal to the radio link quality of other candidate cells in the at least one candidate cell except the second cell; the second The radio link quality of the cell is greater than or equal to the radio link quality of other candidate cells in the at least one candidate cell except the second cell within the second time window; the radio link quality of the second cell The link quality is greater than the radio link quality of the first cell; the radio link quality of the second cell is greater than the radio link quality of the first cell within the second time window; the second The radio link quality of the cell is greater than the sum of the radio link quality of the first cell and the offset; the radio link quality of the second cell is always greater than that of the first cell in the second time window The sum of radio link quality and offset.
  • the method further includes: receiving second information from the access network device on the first cell, where the second information is used to configure the second condition.
  • the method further includes: sending third information to the access network device on the second cell, where the third information is used to indicate that the terminal device A cell is handed over to the second cell, where the handover is a cell handover triggered by the terminal device.
  • the third information includes at least one of the following: an identifier of the terminal device; an identifier of the first cell; Downlink beam information used by the terminal device to send downlink data; indication information, where the indication information indicates cell handover triggered by the terminal device.
  • the third information is carried in a message during a random access procedure initiated by the terminal device on the second cell.
  • the method further includes: sending fourth information to the access network device on the second cell, where the fourth information is carried in a first resource, and the first resource is The resource corresponding to the cell handover triggered by the terminal device.
  • the method further includes: receiving enabling information from the access network device on the first cell, where the enabling information is used to enable the terminal device to operate on the A cell handover is triggered when a problem occurs in the wireless link of the serving cell of the terminal device.
  • the access network device can use the enabling information to control whether the terminal device triggers cell handover after a problem occurs in the wireless link of the serving cell of the terminal device, so that the access network device can flexibly control the behavior of the terminal device.
  • the at least one candidate cell includes: a candidate cell corresponding to Layer 1/Layer 2 handover, and/or a candidate cell corresponding to Layer 3 handover.
  • the embodiment of the present application provides a communication method, which can be applied to the second DU or a module in the second DU.
  • the second DU determines The terminal device has switched from the first cell to the second cell, and the switching is a cell switching triggered by the terminal device.
  • the first cell and the second cell belong to different DUs, send first indication information to the CU, the first indication information indicates that the terminal device has been handed over from the first cell to the second cell, so that the CU can know The terminal device has been handed over from the first cell to the second cell.
  • the CU when both the first cell and the second cell belong to the second DU, send the first indication information and fourth indication information to the CU, where the fourth indication information indicates that the first The data packets that the second DU did not successfully send to the terminal device, so that the CU can send data packets to the terminal device according to the data packets that the second DU did not successfully send to the terminal device after the terminal device performs handover, so as to avoid data Packets are lost or retransmitted.
  • determining that the terminal device has switched from the first cell to the second cell includes: receiving third information from the terminal device, where the third information is used to indicate that the terminal device has switched from the first cell to the second cell. Cell handover to the second cell; or, receiving fourth information from the terminal device, where the fourth information is carried in the first resource, and the first resource is a resource corresponding to the cell handover triggered by the terminal device.
  • the first indication information includes information about the amount of data that has been cached by the second DU; or, the method further includes: sending the amount of data that has been cached by the second DU to the CU information.
  • the third indication information includes at least one of the following: the sequence number of the unsuccessfully sent PDCP PDU; the highest sequence number of the successfully sent PDCP PDU.
  • the third indication information is carried in a user plane data frame or a control plane message.
  • the embodiment of the present application provides a communication method, which can be applied to a CU or a module in a CU.
  • the CU sends the second indication information to the first DU , the second indication information indicates that the terminal device has been handed over from the first cell to the second cell, the handover is a cell handover triggered by the terminal device, the first cell belongs to the first DU, and the second The cell belongs to the second DU; receiving third indication information from the first DU, the third indication information indicating that the first DU has not successfully sent a data packet to the terminal device; according to the third indication information , sending the data packet to the terminal device through the second DU.
  • the CU can receive the third indication information, the CU can send data packets to the terminal device according to the data packets that the first DU failed to send to the terminal device after the terminal device performs handover, so as to avoid data packet loss or Retransmission.
  • the method further includes: receiving first indication information from the second DU, where the first indication information indicates that the terminal device has been handed over from the first cell to the second cell.
  • the third indication information includes at least one of the following: the sequence number of the unsuccessfully sent PDCP PDU; the highest sequence number of the successfully sent PDCP PDU.
  • the embodiment of the present application provides a communication method, which can be applied to the first DU or a module in the first DU.
  • the first DU receives Second indication information from the CU, the second indication information indicating that the terminal equipment has been handed over from the first cell to the second cell, the handover is a cell handover triggered by the terminal equipment, and the first cell belongs to the first DU , the second cell belongs to a second DU; according to the second indication information, send third indication information to the CU, where the third indication information indicates that the first DU has not been successfully sent to the terminal device data pack.
  • the CU can send data packets to the terminal device according to the data packets that the first DU failed to send to the terminal device after the terminal device performs handover, so as to avoid Packets are lost or retransmitted.
  • the third indication information includes at least one of the following: the sequence number of the unsuccessfully sent PDCP PDU; the highest sequence number of the successfully sent PDCP PDU.
  • the embodiment of the present application provides a communication method, which can be applied to the first DU or a module in the first DU.
  • the first DU communicates with The terminal device sends a switching instruction, the switching instruction instructs the terminal device to switch from the first cell to the second cell, the first cell belongs to the first DU, and the second cell belongs to the second DU; the third cell is sent to the CU indication information, where the third indication information indicates a data packet that the first DU has not successfully sent to the terminal device.
  • the switching instruction includes downlink beam information used by the second DU to send downlink data to the terminal device.
  • the embodiment of the present application provides a communication method, which can be applied to a CU or a module in a CU.
  • the CU receives notification information and The third indication information, the notification information is used to notify the CU that the terminal device has been handed over from the first cell to the second cell, and the third indication information indicates that the first DU has not successfully sent the data packet to the terminal device ;
  • the first cell belongs to the first DU, and the second cell belongs to a second DU; sending the data packet to the terminal device through the second DU.
  • the method further includes: receiving information about the amount of data already cached by the second DU.
  • the embodiment of the present application provides a communication method, which can be applied to the second DU or a module in the second DU.
  • the second DU receives Handover completion information from the terminal device, where the handover completion information is used to indicate that the terminal device has been handed over from the first cell to the second cell; the first cell belongs to the first DU, and the second cell belongs to the second DU ; According to the handover completion information, send the data volume information that the second DU has cached to the CU.
  • the handover completion information includes downlink beam information used by the second DU to send downlink data to the terminal device.
  • the present application provides a communication device.
  • the communication device is, for example, a terminal device.
  • the communication device has the function of realizing the above-mentioned first aspect.
  • the communication device includes the corresponding The module or unit or means (means), the module or unit or means can be realized by software, or by hardware, or can be realized by executing corresponding software by hardware.
  • the communication device includes a processing unit and a communication unit, wherein the communication unit can be used to send and receive signals to realize communication between the communication device and other devices; the processing unit can be used to perform the communication Some internal operations of the device.
  • the functions performed by the processing unit and the communication unit may correspond to the operations involved in the first aspect above.
  • the communication device includes a processor, and the processor can be used to be coupled with the memory.
  • the memory may store necessary computer programs or instructions to realize the functions referred to in the first aspect above.
  • the processor may execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device may implement the method in any possible design or implementation manner in the first aspect above.
  • the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for realizing the functions mentioned in the above first aspect.
  • the processor may execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device may implement the method in any possible design or implementation manner in the first aspect above.
  • the communication device includes a processor and an interface circuit, where the processor is used to communicate with other devices through the interface circuit, and perform any possible design or implementation in the first aspect above. method.
  • the present application provides a communication device, for example, an access network device, and the access network device may include a CU and one or more DUs.
  • the communication device is capable of realizing the functions involved in any one of the above-mentioned second to seventh aspects, for example, the communication device includes a corresponding module or unit that performs operations related to any one of the above-mentioned second to seventh aspects or means, the function or unit or means may be implemented by software, or by hardware, or by executing corresponding software by hardware.
  • the communication device includes a processing unit and a communication unit, wherein the communication unit can be used to send and receive signals to realize communication between the communication device and other devices, for example, the communication unit is used to send The device sends system information; the processing unit can be used to perform some internal operations of the communication device. processing unit, communication sheet The functions performed by the unit may correspond to the operations involved in any one of the above second to seventh aspects.
  • the communication device includes a processor, and the processor can be used to be coupled with the memory.
  • the memory may store necessary computer programs or instructions for realizing the functions involved in any one of the above-mentioned second to seventh aspects.
  • the processor may execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device may implement any of the possible designs or implementations of the second aspect to the seventh aspect above. method.
  • the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for realizing the functions involved in any one of the above-mentioned second aspect to the seventh aspect.
  • the processor may execute the computer program or instruction stored in the memory, and when the computer program or instruction is executed, the communication device may implement any of the possible designs or implementations of the second aspect to the seventh aspect above. method.
  • the communication device includes a processor and an interface circuit, where the processor is used to communicate with other devices through the interface circuit, and execute any possible design or implementation of the second aspect to the seventh aspect above methods in methods.
  • the processor can be implemented by hardware or by software.
  • the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software
  • the processor may be a general-purpose processor, which is realized by reading software codes stored in the memory.
  • there may be one or more processors, and one or more memories.
  • the memory can be integrated with the processor, or the memory can be separated from the processor.
  • the memory and the processor can be integrated on the same chip, or they can be respectively arranged on different chips.
  • the embodiment of the present application does not limit the type of the memory and the arrangement of the memory and the processor.
  • the present application provides a communication system.
  • the communication system may include the communication device provided in the eighth aspect above, and may further include the communication device provided in the ninth aspect above.
  • the present application provides a computer-readable storage medium, in which computer-readable instructions are stored, and when the computer reads and executes the computer-readable instructions, the computer executes the above-mentioned first aspect A method in any possible design up to the seventh aspect.
  • the present application provides a computer program product.
  • the computer When a computer reads and executes the computer program product, the computer is made to execute the method in any possible design of the above first aspect to the seventh aspect.
  • the present application provides a chip, the chip includes a processor, the processor is coupled with a memory, and is used to read and execute a software program stored in the memory, so as to realize the first to the first aspects above Any one of the seven possible design methods.
  • FIG. 1 is a schematic diagram of a communication system applicable to an embodiment of the present application
  • FIG. 2A is a schematic diagram of a CU-DU separation architecture provided in an embodiment of the present application.
  • FIG. 2B is a schematic diagram of another CU-DU separation architecture provided by the embodiment of the present application.
  • FIG. 3 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application.
  • FIG. 4 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application.
  • FIG. 5 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application.
  • FIG. 6 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application.
  • FIG. 7 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application.
  • FIG. 8 is a possible exemplary block diagram of a device involved in an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an access network device provided in an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a communication system applicable to an embodiment of the present application.
  • a communication system 10 includes one or more access network devices 20 and one or more terminal devices 30 .
  • the interface between the access network device and the terminal device may be a Uu interface (or called an air interface), and data transmission may be performed between the access network device 20 and the terminal device 30 through air interface resources.
  • the terminal device may be located within the communication coverage of one or more cells of the access network device, and there may be one or more cells providing services for the terminal device.
  • the terminal device can use carrier aggregation (carrier aggregation, CA), dual connectivity (dual connectivity, DC), coordinated multipoint (coordinated multipoint, CoMP) transmission, multiple transmission and reception point (multiple transmission and reception point, mTRP) and other transmission technologies One or more of the jobs.
  • carrier aggregation carrier aggregation, CA
  • dual connectivity dual connectivity, DC
  • coordinated multipoint coordinated multipoint
  • CoMP coordinated multipoint
  • multiple transmission and reception point multiple transmission and reception point
  • mTRP multiple transmission and reception point
  • Terminal equipment is also called user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), etc., and is a device that provides voice and/or data connectivity to users.
  • handheld devices with wireless connectivity vehicle-mounted devices, etc.
  • examples of some terminal devices are: mobile phone (mobile phone), tablet computer, notebook computer, palmtop computer, mobile internet device (mobile internet device, MID), wearable device, virtual reality (virtual reality, VR) device, enhanced Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, smart grid Wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, etc.
  • An access network device refers to a radio access network (radio access network, RAN) node (or device) that connects a terminal to a wireless network, and may also be called a base station.
  • RAN nodes are: Node B (Node B, NB), evolved Node B (gNB), transmission reception point (transmission reception point, TRP), evolved Node B (evolved Node B, eNB), Radio network controller (radio network controller, RNC), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB) , base band unit (base band unit, BBU), or wireless fidelity (wireless fidelity, Wifi) access point (access point, AP), etc.
  • Node B Node B
  • gNB evolved Node B
  • TRP transmission reception point
  • evolved Node B, eNB evolved Node B
  • Radio network controller radio network
  • the control plane protocol layer structure may include a radio resource control (radio resource control, RRC) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) ) layer, radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer (physical layer, PHY);
  • the user plane protocol layer structure may include PDCP layer, RLC layer , a MAC layer, and a physical layer.
  • the PDCP layer may further include a service data adaptation protocol (service data adaptation protocol, SDAP) layer.
  • the SDAP layer, The PDCP layer, the RLC layer, the MAC layer, and the physical layer may also be collectively referred to as the access layer.
  • the 3rd generation partnership project 3rd generation partnership project, 3GPP.
  • the access network device may include one or more centralized units (centralized unit, CU) and one or more distributed units (distributed unit, DU), and multiple DUs may be composed of one CU centralized control, this kind of architecture can be called CU-DU separation architecture.
  • the interface between the CU and the DU may be referred to as an F1 interface, wherein a control plane (control panel, CP) interface may be an F1-C interface, and a user plane (user panel, UP) interface may be an F1-U interface.
  • the processing functions of CU and DU can be divided according to the protocol layer of the wireless network: for example, as shown in Figure 2A, the functions of the PDCP layer and above protocol layers are set in the CU, and the functions of the protocol layers below the PDCP layer (such as RLC layer and MAC layer, etc.) are set at DU.
  • the above-mentioned division of the processing functions of CU and DU according to the protocol layer is only an example, and it can also be divided according to other methods.
  • the functions of the protocol layers above the RLC layer are set in the CU, the RLC layer and the following protocol layers.
  • the functions of the DU are set in the DU, and for example, the CU or DU can be divided into functions with more protocol layers, and for example, the CU or DU can also be divided into partial processing functions with protocol layers. This embodiment of the present application does not limit it.
  • the function of the CU may be implemented by one entity, or may also be implemented by different entities.
  • the functions of the CU can be further divided, that is, the control plane and the user plane are separated and realized by different entities, which are the control plane CU entity (ie, the CU-CP entity) and the user plane CU entity (ie, the CU-UP entity). ), the CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the RAN device.
  • the interface between CU-CP entity and CU-UP entity can be E1 interface
  • the interface between CU-CP entity and DU can be F1-C interface
  • the interface between CU-UP entity and DU can be F1-U interface.
  • FIG. 2B is a schematic diagram of the distribution of an air interface protocol stack. As shown in FIG. 2B , for both the user plane and the control plane, the air interface protocol stack can be RLC, MAC, and PHY in the DU, and PDCP and above protocol layers in the CU.
  • the signaling generated by the CU can be sent to the terminal device through the DU, or the signaling generated by the terminal device can be sent to the CU through the DU.
  • the DU can directly encapsulate the signaling through the protocol layer and transparently transmit it to the terminal device or CU without parsing the signaling.
  • the sending or receiving of the signaling by the DU includes this scenario.
  • signaling at the RRC or PDCP layer will eventually be processed as data at the physical layer and sent to the terminal device, or converted from received data at the physical layer.
  • the RRC layer or PDCP layer signaling can also be considered to be sent by the DU, or sent by the DU and the radio frequency device.
  • the embodiment of the present application does not limit the number of access network devices and terminal devices included in the communication system, and the above-mentioned communication system may also include other Devices or network elements, such as core network devices and relay devices, are not limited in this embodiment of the present application.
  • the communication system shown in FIG. 1 may support various radio access technologies (radio access technology, RAT).
  • the communication system shown in FIG. 1 may be a fourth generation (4th generation, 4G) communication system (also referred to as Long term evolution (long term evolution, LTE) communication system), fifth generation (5th generation, 5G) A communication system (also called a new radio (new radio, NR) communication system), a wireless fidelity (wireless fidelity, Wi-Fi) system, or a future-oriented evolution system.
  • 4G fourth generation
  • LTE long term evolution
  • 5th generation, 5G A communication system (also called a new radio (new radio, NR) communication system), a wireless fidelity (wireless fidelity, Wi-Fi) system, or a future-oriented evolution system.
  • the communication system and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application.
  • Cell handover may include layer 1/layer 2 based cell handover (referred to as layer 1/layer 2 handover for short) and layer 3 based cell handover (referred to as layer 3 handover for short).
  • layer 1/layer 2 may refer to the cell handover implemented based on layer 1 or layer 2, or may also refer to the cell handover implemented based on layer 1 and layer 2.
  • Layer 1 may refer to the physical layer
  • layer 2 may refer to the MAC layer
  • layer 3 may refer to the RRC layer.
  • Layer 1/Layer 2 switching may include the following two types:
  • Layer 1/Layer 2 handover triggered by access network equipment For example, according to the beam-level measurement results reported by the terminal device, the access network device selects a target cell that satisfies the layer 1/layer 2 handover criteria from the candidate cells corresponding to layer 1/layer 2 handover, and sends the layer 1/layer 2 handover criteria to the terminal device. Layer 2 handover instruction to instruct the terminal equipment to handover to the target cell.
  • the beam-level measurement result may also be referred to as a layer 1 measurement result.
  • the Layer 1/Layer 2 handover triggered by the terminal device may also be referred to as Layer 1/Layer 2 conditional handover (conditional handover, CHO).
  • Layer 1/Layer 2 conditional handover conditional handover, CHO.
  • the terminal device selects a target cell that satisfies the layer 1/layer 2 handover criteria from the candidate cells corresponding to the layer 1/layer 2 handover, and autonomously switches to the target cell without the need for the access network device to download the target cell. Send a switching command.
  • Layer 3 handover can include the following two types:
  • Layer 3 handover triggered by access network equipment For example, according to the cell-level measurement results reported by the terminal device, the access network device selects a target cell that satisfies the layer 3 handover criteria from the candidate cells corresponding to layer 3 handover, and sends a layer 3 handover command to the terminal device to instruct the terminal The device switches to the target cell.
  • the cell-level measurement result may also be referred to as a layer 3 measurement result.
  • the Layer 3 handover triggered by the terminal device can also be called Layer 3 CHO; for example, the terminal device selects a target cell that satisfies the Layer 3 handover criterion from the candidate cells corresponding to the Layer 3 handover according to the cell-level measurement results, And switch to the target cell autonomously, without the need for the access network device to issue a switching command.
  • the process for the terminal device to obtain beam-level measurement results may be as follows: the access network device sends reference signals in multiple beam directions of the cell, and the reference signals may be synchronization signal/physical broadcast channel blocks (synchronization signal/physical broadcast channel block, SSB), channel state information reference signal (channel state information reference signal, CSI-RS), or channel sounding reference signal (sounding reference signal, SRS), or other possible reference signals, which are not specifically limited .
  • the terminal device performs measurement according to the reference signal on the time-frequency resource indicated by the access network device.
  • the terminal device can obtain the signal strength of the beam corresponding to the reference signal at multiple instants within a period of time by sampling, and the obtained multiple signals Intensities are weighted or combined to obtain the measurement result of the beam.
  • the measurement result of the beam can also be called beam quality (beam quality) quality); further, the measurement result of the beam may also be filtered by layer 1 filtering to obtain the measurement result after beam filtering, wherein the parameters of layer 1 filtering may be configured by the access network device for the terminal device, for example.
  • the terminal device may also filter the multiple acquired signal strengths, so as to obtain the beam-filtered measurement result.
  • the cell-level measurement result can be obtained by the terminal device by combining or weighting the measurement results of multiple beams of the cell.
  • the measurement result of the cell can be obtained by combining at least one beam of the cell through the configuration of the access network device.
  • the measurement result of the cell can also be called cell quality (cell quality); further, the measurement result of the cell can also be filtered by layer 3 filtering to obtain the measurement result of the cell after filtering, wherein the parameters of the layer 3 filter can be, for example, It is configured by the access network device for the terminal device.
  • the terminal equipment In order to maintain the reliability of the communication between the terminal equipment and the access network equipment, the terminal equipment needs to perform radio link monitoring (radio link monitoring, RLM) on the serving cell, and determine whether a radio link monitoring occurs according to the radio link monitoring results. Failure (radio link failure, RLF).
  • RLM radio link monitoring
  • RLF radio link failure
  • the physical layer of the terminal device detects that the radio link quality of the serving cell is less than the out-of-synchronization threshold within a time window (for ease of description, this time window will be referred to as the third time window hereinafter), it can report to the RRC layer
  • An "out-of-sync indication" when it is detected that the radio link quality of the serving cell is greater than or equal to the synchronization threshold within a third time window, an "in-sync indication (in-sync indication)" may be reported to the RRC layer once.
  • start timer 1 for example, timer 1 is T310
  • start timer 1 for example, timer 1 is T310
  • timer 1 the duration of the timing window of N310, N311, timer 1 and the duration of the third time window may be configured by the access network device for the terminal device.
  • the terminal device can also determine that RLF has occurred in other possible situations. For example, the terminal device can also determine that RLF has occurred when at least one of the following conditions is met: (1) There is a problem with random access, such as the number of times the terminal device fails to initiate random access Greater than or equal to the preset threshold; (2) RLC layer retransmission exceeds the maximum number; (3) Continuous uplink listen before talk (LBT) failure, that is, the terminal device fails to seize the channel for many times in a row.
  • LBT Continuous uplink listen before talk
  • the radio link quality may refer to physical layer channel quality, such as physical downlink control channel (physical downlink control channel, PDCCH) quality or physical downlink shared channel (physical downlink shared channel, PDSCH) quality.
  • physical downlink control channel physical downlink control channel, PDCCH
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the radio link quality may be obtained according to beam-level measurement results.
  • the terminal device performs beam-level measurement on cell 1 and obtains the measurement results of N1 beams in cell 1, then the terminal device can use the average value of the measurement results of at least one of the N1 beams as the wireless link quality of cell 1, Alternatively, the terminal device may also use the average value of the measurement results of the N2 beams with better measurement results among the N1 beams as the radio link quality of the cell 1 .
  • N1 and N2 are positive integers, and N2 is smaller than N1.
  • the embodiment of the present application will study the implementation of the terminal device to restore the wireless link.
  • a possible communication method provided by the embodiment of this application is: when the terminal device detects that the radio link of the serving cell After a road problem occurs, the terminal device can select a target cell that meets the cell selection criteria through a cell selection process, and perform RRC re-establishment to access the target cell, thereby restoring the wireless link.
  • FIG. 3 is a schematic flowchart corresponding to the communication method provided by the embodiment of the present application. As shown in Figure 3, the method includes:
  • the access network device After the access network device determines that the first cell managed by the access network device is the serving cell of the terminal device, it may send configuration information 1 to the terminal device on the first cell.
  • the access network device may send an RRC message including the configuration information 1 to the terminal device on the first cell.
  • the configuration information 1 may include configuration information of the first cell and configuration information of at least one candidate cell of the terminal device.
  • at least one candidate cell may include: a candidate cell corresponding to layer 1/layer 2 handover, and/or a candidate cell corresponding to layer 3 handover.
  • the configuration information of the candidate cell may include configuration information of the terminal device on the candidate cell, and may also include other possible information, such as information about the candidate cell, which is not specifically limited.
  • the configuration information of the first cell may refer to the configuration information of the candidate cell, which will not be repeated here.
  • the configuration information of the terminal device on the candidate cell may include at least one of the following: radio resource configuration information of the terminal device on the candidate cell; radio bearer (radio bearer, RB) configuration information of the terminal device on the candidate cell ;Multi-connectivity (MC) configuration information of the terminal device on the candidate cell, where the multi-connectivity can be one or more combinations of DC, CA, CoMP, mTRP; the candidate cell is the cell allocated by the terminal device Cell-radio network temporary identifier (C-RNTI).
  • radio resource configuration information of the terminal device on the candidate cell may include at least one of the following: radio resource configuration information of the terminal device on the candidate cell; radio bearer (radio bearer, RB) configuration information of the terminal device on the candidate cell ;Multi-connectivity (MC) configuration information of the terminal device on the candidate cell, where the multi-connectivity can be one or more combinations of DC, CA, CoMP, mTRP; the candidate cell is the cell allocated by the terminal device Cell-radio network temporary identifier (C-RNTI
  • the relevant information of the candidate cell may include at least one of the following: reference signal configuration information (such as SSB configuration information, CSI-RS configuration information, SRS configuration information) of the candidate cell; beam measurement configuration information of the candidate cell, such as transmission configuration Indication (transmission configuration indicator, TCI) status configuration information; physical cell identity (physical cell identity, PCI) of the candidate cell.
  • reference signal configuration information such as SSB configuration information, CSI-RS configuration information, SRS configuration information
  • beam measurement configuration information of the candidate cell such as transmission configuration Indication (transmission configuration indicator, TCI) status configuration information
  • physical cell identity physical cell identity, PCI
  • the access network devices to which the first cell and the candidate cell belong may be the same; or, the access network devices to which the first cell and the candidate cell belong may also be different.
  • the access network device to which the first cell belongs may acquire the configuration information of the candidate cell from the access network device to which the candidate cell belongs through the Xn interface.
  • the terminal device performs radio link monitoring on the first cell, and determines that RLF occurs according to a radio link monitoring result.
  • the terminal device determining that the RLF occurs reference may be made to the above description.
  • the terminal device After the terminal device determines that RLF occurs, it will release the configuration information of the first cell (such as suspending the transmission of all radio bearers, that is, the control plane signaling and user plane service data cannot be transmitted through the radio bearer), and will also release Configuration information of at least one candidate cell sent by the access network device to the terminal device on the first cell.
  • the configuration information of the first cell such as suspending the transmission of all radio bearers, that is, the control plane signaling and user plane service data cannot be transmitted through the radio bearer
  • the terminal device After the terminal device performs the cell selection process and selects a cell (such as the second cell) that meets the cell selection criteria through the cell selection process, the terminal device will actively initiate the RRC connection re-establishment process in the second cell.
  • the access process sends an RRC connection re-establishment request message to the access network device on the second cell.
  • the access network device may send an RRC connection re-establishment message to the terminal device.
  • the RRC connection re-establishment message is used to indicate the second cell currently accessed by the terminal device.
  • the cell is a new serving cell of the terminal device.
  • the terminal device After receiving the RRC connection re-establishment message, the terminal device sends the RRC connection re-establishment completion to the access network device information.
  • the access network device may send a configuration message of the second cell to the terminal device on the second cell; correspondingly, the terminal device may receive the configuration information of the second cell.
  • the terminal device communicates with the access network device according to the configuration information of the second cell (that is, restores the radio link), for example, restores the transmission of the radio bearer.
  • the terminal device can perform RRC reestablishment to restore the wireless link.
  • the terminal device will release the configuration information of at least one candidate cell, even if the terminal device selects one of the candidate cells as the new serving cell, the access network device still needs to re-send to the terminal device
  • the configuration information of the new serving cell which leads to a large consumption of transmission resources; on the other hand, because the terminal device needs to release the configuration information of the first cell (such as suspending the transmission of all radio bearers), and after the RRC reconstruction is completed, The transmission of the radio bearer can only be resumed, which will cause a large delay in communication interruption.
  • Another possible communication method provided by the embodiment of the present application is: when the terminal device detects that there is a problem with the wireless link of the serving cell, the terminal device can select a target cell. If the target cell belongs to the candidate cell corresponding to the cell handover, then The terminal device can perform cell switching to switch to the target cell, thereby restoring the wireless link; if the target cell does not belong to the candidate cell corresponding to the cell switching, the terminal device can perform RRC reestablishment to access the target cell, thereby restoring the wireless link.
  • the implementation of "the terminal device selects the target cell” here may be different from the implementation of the terminal device selecting the target cell in the layer 1/layer 2 CHO above, and the terminal device selecting the target cell in the layer 3 CHO above. realization.
  • the implementation of "handover of the terminal device to the target cell” here can be the same as the implementation of the handover of the terminal device to the target cell in the CHO of layer 1/layer 2 above;
  • the implementation of "handover of the terminal device to the target cell” here may be the same as the implementation of handover of the terminal device to the target cell in the layer 3 CHO above.
  • FIG. 4 is a schematic flowchart corresponding to the communication method provided in Embodiment 1 of the present application. As shown in Figure 4, the method includes:
  • the access network device sends configuration information of at least one candidate cell to the terminal device on the first cell; correspondingly, the terminal device may receive configuration information of the at least one candidate cell on the first cell.
  • the terminal device may receive configuration information of the at least one candidate cell on the first cell.
  • the access network device may also send enabling information to the terminal device on the first cell, where the enabling information is used to enable the terminal device to trigger cell handover after a radio link problem occurs in the serving cell; correspondingly, the terminal The device can receive the enabling information, and then can execute the subsequent method flow shown in FIG. 4, otherwise (that is, the access network device has not sent the enabling information to the terminal device, and accordingly, the terminal device has not received the enabling information), then Refer to Figure 3.
  • the terminal device determines that the wireless link of the first cell satisfies the first condition, select a second cell.
  • the second cell may also be called a target cell.
  • the radio link quality of the first cell satisfies the first condition, which may include at least one of the following: (1) the radio link quality of the first cell is less than a first threshold; (2) the radio link quality of the first cell The quality is less than the first threshold within the first time window; (3) the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to a second threshold; (4) the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to the second threshold; After being equal to the second threshold, timer 2 is started, and no synchronization indication is detected within the timing window of timer 2; (5) RLF occurs in the first cell.
  • the first condition which may include at least one of the following: (1) the radio link quality of the first cell is less than a first threshold; (2) the radio link quality of the first cell The quality is less than the first threshold within the first time window; (3) the number of times the terminal device continuously detects an out-of-sync indication is greater than or equal to
  • the first condition can be configured by the access network device for the terminal device, for example, the access network device sends the first information to the terminal device on the first cell, the first information Used to configure the first condition (for example, the first information includes the first threshold, the second threshold, the duration of the timing window of timer 2, and the duration of the first time window).
  • the first threshold can be different from the out-of-sync threshold, and the second threshold It may be different from N310, and the first time window and the third time window may be the same or different, which is not specifically limited.
  • the terminal device selects the second cell.
  • the following uses "at least one candidate cell includes a candidate cell corresponding to Layer 1/Layer 2 handover and a candidate cell corresponding to Layer 3 handover, wherein the layer 1/Layer 2 handover corresponds to
  • the candidate cells include cell a and cell b, and the candidate cells corresponding to layer 3 handover include cell b and cell c" as an example, two possible implementations are described in conjunction with implementation 1 and implementation 2.
  • At least one candidate cell may also only include candidate cells corresponding to Layer 1/Layer 2 handover, that is, ⁇ cell a, cell b ⁇ ; or, at least one candidate cell may also only include candidate cells corresponding to Layer 3 handover , namely ⁇ cell b, cell c ⁇ .
  • at least one candidate cell can be configured by the access network device for the terminal device to only include candidate cells corresponding to Layer 1/Layer 2, or only include candidate cells corresponding to Layer 3 handover, or include candidate cells corresponding to Layer 1/Layer 2 A cell and a candidate cell corresponding to layer 3; or it may also be specified by an agreement.
  • the terminal device may select the second cell from ⁇ cell a, cell b, cell c ⁇ according to the radio link quality or cell-level measurement results of at least one candidate cell (ie, ⁇ cell a, cell b, cell c ⁇ ).
  • the terminal device selects the second cell according to the radio link quality of ⁇ cell a, cell b, cell c ⁇ Quality, judging whether there is a cell whose radio link quality satisfies the second condition in ⁇ cell a, cell b, cell c ⁇ . If there is a cell in ⁇ cell a, cell b, cell c ⁇ whose radio link quality satisfies the second condition, this cell is used as the second cell.
  • the second cell belongs to at least one candidate cell, that is, the second cell The cell is one of ⁇ cell a, cell b, cell c ⁇ .
  • the radio link quality of the second cell satisfies the second condition, which may include at least one of the following: (1) the radio link quality of the second cell is greater than or equal to the third threshold; (2) the radio link quality of the second cell The quality is greater than or equal to the third threshold in the second time window; (3) the radio link quality of the second cell is greater than or equal to the radio link quality of other candidate cells except the second cell in at least one candidate cell; (4) the radio link quality of the second cell is greater than or equal to the radio link quality of other candidate cells except the second cell in at least one candidate cell within the second time window; (5) the radio link quality of the second cell The link quality is greater than the radio link quality of the first cell; (6) the radio link quality of the second cell is greater than the radio link quality of the first cell in the second time window; (7) the radio link quality of the second cell (8) The radio link quality of the second cell is always greater than the sum of the radio link quality and the offset of the first cell in the second time window and.
  • the offset can be a
  • the terminal device can select a cell from cell a and cell b as the second cell according to the beam-level measurement results of cell a and cell b; for example, if there is a beam (called beam 1) in cell a, If the measurement result of beam 1 is better than the measurement results of all beams in cell b, cell a may be selected as the second cell.
  • beam 1 the terminal device can select a cell from cell a and cell b as the second cell according to the beam-level measurement results of cell a and cell b; for example, if there is a beam (called beam 1) in cell a, If the measurement result of beam 1 is better than the measurement results of all beams in cell b, cell a may be selected as the second cell.
  • Method 2 The terminal device can select a cell from cell a and cell b as the second cell according to the cell-level measurement results of cell a and cell b; for example, if the measurement result of cell a is better than the measurement result of cell b, it can Cell a is selected as the second cell.
  • Method 3 It depends on the internal implementation of the terminal equipment, that is, the terminal equipment decides to select cell a or Cell b serves as the second cell. For example, it may be stipulated in the agreement which method among method 1, method 2, and method 3 is adopted, or the access network device may instruct the terminal device which method is specifically adopted.
  • the terminal device can perform the cell selection process, and select a cell that meets the cell selection criteria through the cell selection process, and this cell is the second cell.
  • the second cell does not belong to at least one candidate cell, that is, the second cell is ⁇ Cells other than cell a, cell b, and cell c ⁇ .
  • the terminal device selects the second cell according to the cell-level measurement results of ⁇ cell a, cell b, cell c ⁇ As a result, it is judged whether there is a cell whose cell-level measurement result satisfies the third condition in ⁇ cell a, cell b, cell c ⁇ . If there is a cell in ⁇ cell a, cell b, cell c ⁇ whose cell-level measurement result satisfies the third condition, then this cell is used as the second cell. In this case, the second cell is ⁇ cell a, cell b, cell A cell in c ⁇ .
  • the cell-level measurement result of the second cell satisfies the third condition, which may include at least one of the following: (1) the cell-level measurement result of the second cell is greater than or equal to the fourth threshold; (2) the cell-level measurement result of the second cell The result is greater than or equal to the cell-level measurement results of other candidate cells except the second cell in at least one candidate cell; (3) the cell-level measurement result of the second cell is greater than the cell-level measurement result of the first cell.
  • the terminal device may perform a cell selection process, and select a cell that satisfies the cell selection criteria through the cell selection process, and the cell is the second cell.
  • the second cell does not belong to at least one candidate cell.
  • the terminal device performs the cell selection process in an idle state. In this case, the terminal device can perform the cell selection process according to the first measurement cycle; and in the embodiment of the application, the terminal device performs the cell selection process in the idle state.
  • the terminal device can perform the cell selection process according to the second measurement cycle, which can be shorter than the first measurement cycle.
  • the terminal device in the embodiment of this application The device can perform the cell selection process according to the real-time radio link quality of the cell.
  • the access network device may send second information to the terminal device, and the second information is used to instruct the terminal device to select the second cell according to the quality of the radio link.
  • the second information may also configure the second The condition, for example, the second information may include a third threshold, an offset, a duration of the second time window, and the like.
  • the terminal device may select the second cell according to the radio link quality of at least one candidate cell. Otherwise (that is, the access network device has not sent the second information to the terminal device, and correspondingly, the terminal device has not received the second information), the terminal device may select the second cell according to the cell-level measurement result of at least one candidate cell.
  • the terminal device may select the second cell from the cells included in the second candidate cell list according to the radio link quality or the cell-level measurement result of the cells included in the second candidate cell list.
  • the second candidate cell list may be different from the first candidate cell list, and the first candidate cell list includes at least one candidate cell, that is, the first candidate cell list may be ⁇ cell a, cell b, cell c ⁇ .
  • the second candidate cell list may include other cells in addition to all the cells included in the first candidate cell list, for example, the second candidate cell list is ⁇ cell a, cell b, cell c, cell d ⁇ .
  • implementation of the second cell selected by the terminal device may refer to Implementation Mode 1, and the second cell selected by the terminal device may or may not belong to at least one candidate cell.
  • the second candidate cell list may be configured by the access network device for the terminal device, such as the access network device
  • the cell list configuration information may be sent to the terminal device, where the cell list configuration information is used to configure the second candidate cell list.
  • the terminal device may suspend the transmission of all radio bearers, but not release at least one For the configuration information of the candidate cell, S403A may be performed subsequently to restore the wireless link. If the terminal device determines that the selected second cell does not belong to at least one candidate cell (for example, the second cell is cell d), it may suspend the transmission of all radio bearers, and release the configuration information of at least one candidate cell, and subsequently execute S403B to restore the wireless link.
  • the terminal device switches from the first cell to the second cell, and communicates with the access network device on the second cell according to the configuration information of the second cell.
  • the terminal device may perform Layer 1/Layer 2 handover from the first cell to the second cell. If the second cell is cell c, the terminal device may perform layer 3 handover from the first cell to the third cell. If the second cell is cell b (that is, the second cell is not only a candidate cell corresponding to Layer 1/Layer 2 handover, but also a candidate cell corresponding to Layer 3 handover), the following three methods can exist; among them, Method 1: The terminal device executes Layer 1/Layer 2 handover from the first cell to the second cell; mode 2: the terminal device performs a layer 3 handover from the first cell to the second cell; mode 3: depends on the internal implementation of the terminal device, that is, the terminal device It decides to perform Layer 1/Layer 2 handover from the first cell to the second cell or to perform Layer 3 handover from the first cell to the second cell. For example, it may be stipulated in the agreement which method among method 1, method 2, and method 3 is adopted, or the access network device may instruct the
  • the access network device may be notified on the second cell that the terminal device has been handed over from the first cell to the second cell, and the handover is triggered by the terminal device.
  • Cell handover for example, the handover is a cell handover triggered by the terminal device selecting a second cell based on the foregoing manner (such as implementation manner 1 or implementation manner 2).
  • the terminal device can send third information to the access network device on the second cell, the third information is used to indicate that the terminal device has switched from the first cell to the second cell, and the handover is the cell triggered by the terminal device switch. That is to say, the terminal device can notify the access network device in an explicit manner.
  • the third information may include at least one of the following items: an identifier of the terminal device; an identifier of the first cell (that is, an identifier of the source cell); indication information a, and the indication information a indicates cell handover triggered by the terminal equipment.
  • the third information may be carried in a message during a random access procedure initiated by the terminal device on the second cell.
  • the third information may be carried in message 3 in the four-step random access process; if the random access process is a two-step random access process, the third information It can be carried in message A in the two-step random access process. Further optionally, the third information may be carried in a MAC control element (control element, CE) in message 3 or message A. Alternatively, the third information may also be carried in other messages other than the random access procedure.
  • the random access process is a four-step random access process
  • the third information It can be carried in message A in the two-step random access process.
  • the third information may be carried in a MAC control element (control element, CE) in message 3 or message A.
  • the third information may also be carried in other messages other than the random access procedure.
  • the terminal device may send the fourth information to the access network device on the second cell, the fourth information is carried in the first resource, and the first resource is the resource corresponding to the cell handover triggered by the terminal device. That is to say, the terminal device can notify the access network device in an implicit manner.
  • the fourth information may be carried in a message (such as message 3 or message A) in the random access procedure initiated by the terminal device on the second cell, or may be carried in other messages outside the random access procedure.
  • the first resource may be a physical uplink control channel (physical uplink control channel, PUCCH) resource
  • the first resource may be configured by the access network device for the terminal device, for example, the access network device may send The terminal device sends fifth information, where the fifth information is used to configure the first resource.
  • PUCCH physical uplink control channel
  • the terminal device may also send downlink beam information to the access network device on the second cell, and the downlink beam information is used to instruct the access network device to The terminal device sends The downlink beam used for uplink data.
  • the downlink beam may be narrower than the beam corresponding to the target SSB, and the target SSB may be the SSB associated with the random access resource used by the terminal device to initiate random access on the second cell.
  • the downlink beam information may be included in the third information or the fourth information, or may be additionally sent by the terminal device to the access network device, which is not specifically limited.
  • the downlink beam information may indicate a beam (for example, the first beam), and the first beam may be the beam with the best measurement result among multiple beams of the second cell determined by the terminal device.
  • the access network device may according to Downlink beam information, using the first beam to send downlink data to the terminal device on the second cell.
  • the downlink beam information may also indicate multiple candidate beams determined by the terminal device.
  • the access network device may select a downlink beam (such as the second beam) from multiple candidate beams according to the downlink beam information, and use The second beam sends downlink data to the terminal device on the second cell.
  • the terminal device performs RRC reestablishment to access the second cell.
  • the terminal device may release the configuration information of at least one candidate cell, and initiate an RRC connection re-establishment process in the second cell.
  • the terminal device may release the configuration information of at least one candidate cell, and initiate an RRC connection re-establishment process in the second cell.
  • RRC connection re-establishment process in the second cell.
  • the configuration information, first information, second information, fifth information, and enabling information of at least one candidate cell may be carried in the same message, or may be carried in different messages.
  • the message is not limited.
  • the terminal device when the terminal device detects that there is a problem with the wireless link, the terminal device may not release the configuration information of at least one candidate cell, and when the terminal device selects one of the candidate cells as the new serving cell, the terminal device It is possible to communicate with the access network device according to the configuration information of the new serving cell, without the need for the access network device to resend the configuration information of the new serving cell to the terminal device, thereby effectively saving transmission resources; and, since the terminal device can trigger cell Handover from the source cell to the new serving cell, compared to the RRC reestablishment process, can quickly restore communication and effectively reduce the delay of communication interruption.
  • the implementation process of the embodiment of the present application is described from the perspective of communication between the access network device and the terminal device.
  • the access network device may include a CU and one or more DUs, the following describes some possible implementation processes from the perspective of communication between the CU, the DU and the terminal device in conjunction with Embodiment 2.
  • the first cell and the second cell in the first embodiment above may belong to different DUs managed by the CU, for example, the first cell belongs to the first DU, and the second cell belongs to the second DU.
  • Scenario 1 The first cell belongs to the first DU, and the second cell belongs to the second DU
  • FIG. 5 is a schematic flowchart corresponding to the communication method provided in Embodiment 2 of the present application. As shown in FIG. 5, the method includes:
  • the CU sends configuration information of at least one candidate cell to the terminal device through a first DU to which the first cell belongs, where the first cell is a serving cell of the terminal device.
  • the CU may send an RRC message to the first DU, and then the first DU forwards the RRC message to the terminal device, where the RRC message includes configuration information of at least one candidate cell.
  • description is made by taking the second cell belonging to at least one candidate cell as an example.
  • the terminal device switches from the first cell to the second cell.
  • the second DU determines that the terminal device has been handed over from the first cell to the second cell.
  • the terminal device may send the third information to the second DU, and correspondingly, after receiving the third information from the terminal device, the second DU may determine that the terminal device has been handed over from the first cell to the second cell.
  • the terminal device may send fourth information to the second DU.
  • the second DU may determine that the terminal device has received the fourth information from the first resource. The cell is handed over to the second cell.
  • the second DU sends first indication information to the CU, where the first indication information indicates that the terminal device has been handed over from the first cell to the second cell.
  • the second DU may also send first downlink data delivery status (DDDS) information to the CU, where the first DDDS information is used by the CU to control the flow of downlink data sent to the terminal device through the second DU,
  • the first DDDS information may include the amount of data already cached by the second DU.
  • the first indication information may include at least one of the following: an identifier of the terminal device; an identifier of the second cell (that is, an identifier of the target cell); and indication information b, where the indication information b indicates the cell handover triggered by the terminal equipment.
  • the indication information b may be the first DDDS information (that is, the cell handover triggered by the terminal device is implicitly indicated through the first DDDS information), in this case, the indication information b in the first indication information It can be transmitted through the user plane data frame of the F1 interface, and other information (such as the identity of the terminal device and/or the identity of the second cell) can be transmitted through the user plane data frame, or can also be transmitted through the control plane message of the F1 interface, There is no specific limit. As yet another possible implementation, the indication information b may also be other possible information. In this case, the first indication information may be transmitted through a control plane message of an F1 interface message.
  • the CU sends second indication information to the first DU, the second indication information indicating that the terminal device has switched from the first cell to the second cell; correspondingly, the first DU receives the second indication information, and stops communicating with the terminal device (For example, stop sending downlink data to the terminal device).
  • the second indication information may include at least one of the following items: an identifier of the terminal device; an identifier of the second cell; indication information c, where the indication information c indicates cell handover triggered by the terminal equipment.
  • the second indication information may be carried in a control plane message of the F1 interface.
  • the first DU sends third indication information to the CU, where the third indication information indicates the data packets that the first DU has not successfully sent to the terminal device. Further, the first DU may stop sending downlink data to the terminal device.
  • the third indication information may include at least one of the following: the sequence number (sequence number, SN) of the PDCP PDU that the first DU was not successfully sent; the highest sequence number of the PDCP PDU that the first DU was successfully sent.
  • the third indication information may be included in the second DDDS information, and transmitted through the user plane data frame of the F1 interface; or the third indication information may also be transmitted through the control plane message of the F1 interface, which is not specifically limited.
  • the CU sends the data packet to the terminal device through the second DU according to the third indication information.
  • the CU can retransmit the PDCP PDUs corresponding to these serial numbers through the second DU; if the third indication information includes the first DU has been successfully sent The highest sequence number of the PDCP PDU, the CU can send the PDCP PDU after the highest sequence number to the terminal device through the second DU.
  • the terminal device can also send downlink beam information to the second DU (for the downlink beam information, refer to Embodiment 1), therefore, in S505, the second DU can use the downlink beam information according to the The corresponding downlink beam sends the data packet to the terminal device.
  • FIG. 6 is a schematic flowchart corresponding to the communication method provided in Embodiment 2 of the present application. As shown in FIG. 6, the method includes:
  • the CU sends configuration information of at least one candidate cell to the terminal device through the second DU to which the first cell belongs, where the first cell is a serving cell of the terminal device.
  • description is made by taking the second cell belonging to at least one candidate cell as an example.
  • the terminal device switches from the first cell to the second cell.
  • the second DU determines that the terminal device has been handed over from the first cell to the second cell.
  • the second DU sends first indication information and fourth indication information to the CU, the first indication information indicates that the terminal device has switched from the first cell to the second cell, and the fourth indication information indicates that the second DU has not been successfully sent to the terminal device data packets.
  • the CU sends the data packet to the terminal device through the second DU according to the data packet not successfully sent by the second DU to the terminal device.
  • the terminal device when it detects that there is a problem with the radio link of the first cell, it can switch from the first cell to the second cell (the second cell belongs to at least one candidate cell), and according to the The configuration information of the second cell received in one cell communicates with the target DU (that is, the DU to which the second cell belongs), without the need for the CU to resend the configuration information of the second cell to the terminal device, thereby effectively saving transmission resources, Reduce latency for communication interruptions.
  • the source DU (that is, the DU to which the first cell belongs) can send indication information to the CU to indicate that the source DU has not successfully sent data packets to the terminal device, so that the CU can send these unsuccessfully sent packets to the terminal device through the target DU. data packets, effectively avoiding the risk of data packet loss.
  • the terminal device selects the second cell based on the method in the first embodiment, and performs Layer 1/Layer 2 handover Switching from the first cell to the second cell, and then the second DU may determine that the terminal device has switched from the first cell to the second cell according to the third information or the fourth information sent by the terminal device.
  • "S501 to S504" or "S601 to S604" can also be replaced by: the terminal device switches from the first cell to the second cell through Layer 1/Layer 2 CHO, and then the second DU can be based on
  • the handover completion information sent by the terminal device determines that the terminal device has been handed over from the first cell to the second cell.
  • the handover completion information may be a Layer 1/Layer 2 message, and the handover completion information may include downlink beam information; or, the terminal device may additionally send the downlink beam information to the second DU.
  • Layer 1/Layer 2 handover triggered by access network equipment (Layer 3 handover triggered by access network equipment can be implemented by reference) will be described. Implement the process.
  • FIG. 7 is a schematic flowchart corresponding to the communication method provided in Embodiment 3 of the present application. As shown in FIG. 7, the method includes:
  • the CU sends the configuration information of at least one candidate cell to the terminal device through the first DU to which the first cell belongs. interest.
  • At least one candidate cell may include a candidate cell corresponding to Layer 1/Layer 2 handover.
  • the terminal device performs beam-level measurement on the first cell and at least one candidate cell, and reports the beam-level measurement result to the first DU.
  • the first DU selects a target cell from at least one candidate cell according to the beam-level measurement results, for example, the target cell is the second cell, and sends a layer 1/layer 2 switching instruction to the terminal device, and the switching instruction is used to instruct the terminal
  • the device switches from the first cell to the second cell; correspondingly, the terminal device receives the switching instruction, and switches from the first cell to the second cell according to the switching instruction.
  • the realization that the first DU selects the target cell according to the beam-level measurement result may refer to the prior art.
  • the switching instruction of layer 1 may be downlink control information (downlink control information, DCI), and the switching instruction of layer 2 may be MAC CE.
  • the handover instruction may include identification information of the second cell and downlink beam information, where the downlink beam information is used to indicate the downlink beam used by the second DU to which the second cell belongs to send downlink data to the terminal device.
  • the first DU sends third indication information to the CU, where the third indication information is used to indicate the data packets that the first DU has not successfully sent to the terminal device. Further, the first DU may stop sending downlink data to the terminal device.
  • the terminal device sends handover completion information to the second DU, where the handover completion information indicates that the terminal device has been handed over from the first cell to the second cell.
  • the terminal device may also send downlink beam information to the second DU.
  • the downlink beam information sent by the terminal device to the second DU may be the downlink beam information carried in the Layer 1/Layer 2 switching instruction in S703.
  • the subsequent second DU may use the corresponding downlink beam to send the data packet to the terminal device according to the downlink beam information.
  • the handover completion information may be a Layer 1/Layer 2 message.
  • the handover completion information may include the downlink beam information; or, the terminal device may additionally send the downlink beam information to the second DU.
  • the second DU sends notification information to the CU, where the notification information is used to notify the CU that the terminal device has been handed over from the first cell to the second cell.
  • the notification information may include first DDDS information, for example, the first DDDS information may include the amount of data already buffered by the second DU.
  • the CU sends the data packet to the terminal device through the second DU according to the third indication information.
  • the first DU can send the third indication information to the CU after sending the switching instruction to the terminal device, so that the CU can send these unresolved information to the terminal device through the target DU (ie, the second DU).
  • the target DU ie, the second DU.
  • Successfully sent data packets effectively avoid the risk of data packet loss; and, since the terminal device can send downlink beam information to the second DU, the second DU can use the corresponding beam to send downlink data to the terminal device according to the downlink beam information .
  • Embodiments 1 to 3 are described by taking the serving cell of the terminal device as a cell as an example. In other possible situations, such as when the terminal device works in a dual connection mode, embodiments 1 to 3
  • the scheme in can be applied to the handover of the primary base station in dual connectivity, or can also be applied to the addition of secondary base station (secondary node, SN)/secondary cell group (secondary cell group, SCG) or the change of secondary base station/secondary cell group.
  • secondary node secondary node
  • SCG secondary cell group
  • the terminal device determines that the wireless links of the cells in the secondary base station/secondary cell group meet the first condition, the The method restores the wireless link of the cell.
  • step numbers of the various flow charts described in Embodiment 1 to Embodiment 3 are only an example of the execution flow, and do not constitute a restriction on the order of execution of the steps. There is no timing dependence between each other in the embodiments of the present application There is no strict order of execution among the steps of a relationship. Not all the steps illustrated in each flow chart are necessary steps, and some steps may be deleted on the basis of each flow chart according to actual needs, or other possible steps may be added on the basis of each flow chart according to actual needs.
  • Embodiment 1 to Embodiment 3 can be referred to each other; in addition, in the same embodiment , different implementations or different examples can also refer to each other.
  • the terminal device and the access network device may include corresponding hardware structures and/or software modules for performing various functions.
  • the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.
  • the terminal device and the access network device may be divided into functional units according to the above method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • FIG. 8 shows a possible exemplary block diagram of the device involved in the embodiment of the present application.
  • an apparatus 800 may include: a processing unit 802 and a communication unit 803 .
  • the processing unit 802 is used to control and manage the actions of the device 800 .
  • the communication unit 803 is used to support communication between the apparatus 800 and other devices.
  • the communication unit 803 is also referred to as a transceiver unit, and may include a receiving unit and/or a sending unit, configured to perform receiving and sending operations respectively.
  • the device 800 may further include a storage unit 801 for storing program codes and/or data of the device 800 .
  • the apparatus 800 may be the terminal device in the foregoing embodiments.
  • the processing unit 802 may support the apparatus 800 to execute the actions of the terminal device in the above method examples.
  • the processing unit 802 mainly executes internal actions of the terminal device in the method example, and the communication unit 803 may support communication between the apparatus 800 and other devices.
  • the communication unit 803 is configured to: receive configuration information of at least one candidate cell from the access network device on the first cell; the processing unit 802 is configured to: when the wireless link of the first cell When the first condition is met, select a second cell; if the second cell belongs to the at least one candidate cell, switch from the first cell to the second cell, and receive The received configuration information of the second cell is communicated with the access network device on the second cell through the communication unit 803; or, if the second cell does not belong to the at least one candidate cell, then Perform RRC re-establishment to access the second cell.
  • the apparatus 800 may be the access network device in the foregoing embodiments.
  • the processing unit 802 may support the apparatus 800 to execute the actions of the access network device in the above method examples.
  • the processing unit 802 mainly executes internal actions of the access network device in the method example, and the communication unit 803 may support communication between the apparatus 800 and other devices.
  • each unit in the device can all be implemented in the form of software called by the processing element; they can also be implemented in the form of hardware; some units can also be implemented in the form of software called by the processing element, and some units can be implemented in the form of hardware.
  • each unit can be a separate processing element, or it can be integrated in a certain chip of the device.
  • it can also be stored in the memory in the form of a program, which is called and executed by a certain processing element of the device. Function.
  • each operation of the above method or each unit above may be realized by an integrated logic circuit of hardware in a processor element, or may be implemented in a form of software called by a processing element.
  • the units in any of the above devices may be one or more integrated circuits configured to implement the above method, for example: one or more specific integrated circuits (application specific integrated circuit, ASIC), or, one or Multiple microprocessors (digital signal processor, DSP), or, one or more field programmable gate arrays (field programmable gate array, FPGA), or a combination of at least two of these integrated circuit forms.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • FPGA field programmable gate array
  • the units in the device can be implemented in the form of a processing element scheduler
  • the processing element can be a processor, such as a general-purpose central processing unit (central processing unit, CPU), or other processors that can call programs.
  • CPU central processing unit
  • these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • the above unit for receiving is an interface circuit of the device for receiving signals from other devices.
  • the receiving unit is an interface circuit for the chip to receive signals from other chips or devices.
  • the above sending unit is an interface circuit of the device, and is used to send signals to other devices.
  • the sending unit is an interface circuit used by the chip to send signals to other chips or devices.
  • an access network device 90 may include one or more DUs 901 and one or more CUs 902.
  • the DU 901 may include at least one antenna 9011, at least one radio frequency unit 9012, at least one processor 9013 and at least one memory 9014.
  • the DU 901 part is mainly used for transmitting and receiving radio frequency signals, conversion of radio frequency signals and baseband signals, and part of baseband processing.
  • the CU 902 may include at least one processor 9022 and at least one memory 9021 .
  • the CU 902 part is mainly used for baseband processing, controlling access network equipment, and the like.
  • the DU 901 and CU 902 can be physically set together, or physically separated, that is, distributed base stations.
  • the CU 902 is the control center of the access network equipment, and can also be called a processing unit, which is mainly used to complete the baseband processing function.
  • the CU 902 may be used to control the access network device to execute the operation procedures related to the access network device in the foregoing method embodiments.
  • the access network device 90 may include one or more radio frequency units, one or more DUs, and one or more CUs.
  • the DU may include at least one processor 9013 and at least one memory 9014
  • the radio frequency unit may include at least one antenna 9011 and at least one radio frequency unit 9012
  • the CU may include at least one processor 9022 and at least one memory 9021.
  • the CU902 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network (such as a 5G network) with a single access indication, or separately support wireless access networks of different access standards.
  • Access network such as LTE network, 5G network or other networks.
  • the memory 9021 and the processor 9022 may serve one or more boards. That is to say, memory and processors can be set independently on each single board. It may also be that multiple single boards share the same memory and processor. In addition, necessary circuits can also be set on each single board.
  • the DU901 can be constructed from one or more single boards As a result, multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), or they can separately support wireless access networks with different access standards (such as an LTE network, a 5G network or other networks).
  • the memory 9014 and processor 9013 may serve one or more boards. That is to say, memory and processors can be set independently on each single board. It may also be that multiple single boards share the same memory and processor. In addition, necessary circuits can also be set on each single board.
  • the access network device shown in FIG. 9 can implement various processes related to the access network device in the foregoing method embodiments.
  • the operations and/or functions of the various modules in the access network device shown in FIG. 9 are respectively for implementing the corresponding processes in the foregoing method embodiments.
  • the terminal device can be applied to the communication system shown in FIG. 1 to realize the operation of the terminal device in the above embodiments.
  • the terminal device includes: an antenna 1010 , a radio frequency part 1020 , and a signal processing part 1030 .
  • the antenna 1010 is connected to the radio frequency part 1020 .
  • the radio frequency part 1020 receives the information sent by the network device through the antenna 1010, and sends the information sent by the network device to the signal processing part 1030 for processing.
  • the signal processing part 1030 processes the information of the terminal equipment and sends it to the radio frequency part 1020.
  • the radio frequency part 1020 processes the information of the terminal equipment and sends it to the network equipment through the antenna 1010.
  • the signal processing part 1030 may include a modulation and demodulation subsystem, which is used to realize the processing of each communication protocol layer of the data; it may also include a central processing subsystem, which is used to realize the processing of the operating system and the application layer of the terminal equipment; in addition, it may also Including other subsystems, such as multimedia subsystems, peripheral subsystems, etc., wherein the multimedia subsystem is used to realize the control of the terminal equipment camera, screen display, etc., and the peripheral subsystem is used to realize the connection with other devices.
  • the modem subsystem can be a separate chip.
  • the modem subsystem may include one or more processing elements 1031, including, for example, a master CPU and other integrated circuits.
  • the modem subsystem may further include a storage element 1032 and an interface circuit 1033 .
  • the storage element 1032 is used to store data and programs, but the program used to execute the method executed by the terminal device in the above methods may not be stored in the storage element 1032, but stored in a memory outside the modem subsystem, When used, the modem subsystem is loaded and used.
  • the interface circuit 1033 is used to communicate with other subsystems.
  • the modem subsystem can be realized by a chip, and the chip includes at least one processing element and an interface circuit, wherein the processing element is used to execute each step of any method performed by the terminal device above, and the interface circuit is used to communicate with other devices.
  • the unit for the terminal device to implement each step in the above method may be implemented in the form of a processing element scheduler.
  • the device for the terminal device includes a processing element and a storage element, and the processing element calls the program stored in the storage element to Execute the method performed by the terminal device in the above method embodiment.
  • the storage element may be a storage element on the same chip as the processing element, that is, an on-chip storage element.
  • the program for executing the method executed by the terminal device in the above method may be stored in a storage element on a different chip from the processing element, that is, an off-chip storage element.
  • the processing element invokes or loads a program from the off-chip storage element on the on-chip storage element, so as to invoke and execute the method performed by the terminal device in the above method embodiment.
  • the unit of the terminal device that implements each step in the above method may be configured as one or more processing elements, and these processing elements are set on the modem subsystem, where the processing elements may be integrated circuits, For example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip.
  • the units of the terminal device for implementing each step in the above method can be integrated together and implemented in the form of an SOC, and the SOC chip is used to implement the above method.
  • the chip may integrate at least one processing element and a storage element, and the processing element calls the stored program of the storage element to realize the above method performed by the terminal device; or, the chip may Integrating at least one integrated circuit to implement the method executed by the above terminal device; or, in combination with the above implementation methods, the functions of some units are implemented in the form of calling programs by processing elements, and the functions of some units are implemented in the form of integrated circuits.
  • the above apparatus for a terminal device may include at least one processing element and an interface circuit, where at least one processing element is configured to execute any method performed by the terminal device provided in the above method embodiments.
  • the processing element can perform some or all of the steps performed by the terminal device in the first way: that is, by calling the program stored in the storage element; or in the second way: through the integrated logic circuit of the hardware in the processor element combined with instructions Part or all of the steps performed by the terminal device may be performed in a manner; of course, some or all of the steps performed by the terminal device may also be performed in combination with the first method and the second method.
  • the processing elements here are the same as those described above, and may be implemented by a processor, and the functions of the processing elements may be the same as those of the processing unit described in FIG. 8 .
  • the processing element may be a general-purpose processor, such as a CPU, and may also be one or more integrated circuits configured to implement the above method, such as: one or more ASICs, or, one or more microprocessors DSP , or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.
  • the storage element may be implemented by a memory, and the function of the storage element may be the same as that of the storage unit described in FIG. 8 .
  • a storage element may be one memory, or a general term for multiple memories.
  • the terminal device shown in FIG. 10 can implement various processes related to the terminal device in the foregoing method embodiments.
  • the operations and/or functions of the various modules in the terminal device shown in FIG. 10 are respectively for implementing the corresponding processes in the foregoing method embodiments.
  • system and “network” in the embodiments of the present application may be used interchangeably.
  • “At least one” means one or more, and “plurality” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items. For example “at least one of A, B and C” includes A, B, C, AB, AC, BC or ABC.
  • ordinal numerals such as “first” and “second” mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, timing, priority or importance of multiple objects degree.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device implements one or more processes in the flow chart and/or one or more blocks in the block diagram The function specified in the box.

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Abstract

本申请涉及通信技术领域，公开了一种通信方法及装置。其中方法包括：终端设备在第一小区上接收来自接入网设备的至少一个候选小区的配置信息；当第一小区的无线链路满足第一条件(即第一小区的无线链路出现问题)时，选择第二小区。若第二小区属于至少一个候选小区，则从第一小区切换至第二小区，并根据第二小区的配置信息在第二小区上与接入网设备进行通信；如此，当第一小区的无线链路出现问题后，由于终端设备可以切换到第二小区，并根据在第一小区上接收到的第二小区的配置信息与接入网设备进行通信，从而能够有效节省传输资源，快速恢复无线链路。或者，若第二小区不属于至少一个候选小区，则执行RRC重建接入第二小区以恢复无线链路。

Description

一种通信方法及装置
相关申请的交叉引用
本申请要求在2022年02月28日提交中国专利局、申请号为202210188271.9、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
随着科学技术的不断发展，诸如自动驾驶和虚拟现实等新型互联网业务在不断的涌现，这也使得对无线通信技术要求也变得越来越高。
在无线通信***中，无线链路质量直接决定了数据传输的能力，因此，当终端设备检测到无线链路出现问题后，如何恢复无线链路，仍需进一步研究。
发明内容
本申请提供了一种通信方法及装置，用于在终端设备检测到无线链路出现问题后，快速恢复无线链路。
第一方面，本申请实施例提供一种通信方法，该方法可以应用于终端设备或者终端设备中的模块，以该方法应用于终端设备为例，在该方法中，终端设备在第一小区上接收来自接入网设备的至少一个候选小区的配置信息；当所述第一小区的无线链路满足第一条件(即第一小区的无线链路出现问题)时，选择第二小区；若所述第二小区属于所述至少一个候选小区，则从所述第一小区切换至所述第二小区，并根据在所述第一小区上接收到的所述第二小区的配置信息，在所述第二小区上与所述接入网设备进行通信；或者，若所述第二小区不属于所述至少一个候选小区，则执行RRC重建接入所述第二小区。
采用上述方法，当终端设备检测到当前服务小区的无线链路出现问题后，终端设备可以不释放至少一个候选小区的配置信息，因此，当终端设备选择其中一个候选小区作为新服务小区后，终端设备可以根据新服务小区的配置信息与接入网设备进行通信，而无需接入网设备重新向终端设备发送新服务小区的配置信息，从而能够有效节省传输资源，快速恢复无线链路。
在一种可能的设计中，所述第一小区的无线链路质量满足第一条件，包括以下至少一项：所述第一小区的无线链路质量小于第一阈值；所述第一小区的无线链路质量在第一时间窗口内均小于所述第一阈值；终端设备连续检测到失步指示的次数大于或等于第二阈值；所述终端设备连续检测到失步指示的次数大于或等于第二阈值后，启动定时器，在所述定时器的定时窗口内，未检测到同步指示；所述第一小区发生无线链路失败RLF。
在一种可能的设计中，所述方法还包括：在所述第一小区上接收来自所述接入网设备的第一信息，所述第一信息用于配置所述第一条件。
在一种可能的设计中，所述第二小区的无线链路质量满足第二条件；所述第二小区的 无线链路质量满足第二条件，包括以下至少一项：所述第二小区的无线链路质量大于或等于第三阈值；所述第二小区的无线链路质量在第二时间窗口内均大于或等于所述第三阈值；所述第二小区的无线链路质量大于或等于所述至少一个候选小区中除所述第二小区之外的其它候选小区的无线链路质量；所述第二小区的无线链路质量在所述第二时间窗口内均大于或等于所述至少一个候选小区中除所述第二小区之外的其它候选小区的无线链路质量；所述第二小区的无线链路质量大于所述第一小区的无线链路质量；所述第二小区的无线链路质量在所述第二时间窗口内均大于所述第一小区的无线链路质量；所述第二小区的无线链路质量大于所述第一小区的无线链路质量与偏移量之和；所述第二小区的无线链路质量在所述第二时间窗口内始终大于所述第一小区的无线链路质量与偏移量之和。
在一种可能的设计中，所述方法还包括：在所述第一小区上接收来自所述接入网设备的第二信息，所述第二信息用于配置所述第二条件。
在一种可能的设计中，所述方法还包括：在所述第二小区上向所述接入网设备发送第三信息，所述第三信息用于指示所述终端设备已从所述第一小区切换至所述第二小区，所述切换为所述终端设备触发的小区切换。
在一种可能的设计中，所述第三信息包括以下至少一项：所述终端设备的标识；所述第一小区的标识；所述接入网设备在所述第二小区上向所述终端设备发送下行数据所使用的下行波束信息；指示信息，所述指示信息指示所述终端设备触发的小区切换。
在一种可能的设计中，所述第三信息承载于所述终端设备在所述第二小区上发起的随机接入过程中的消息。
在一种可能的设计中，所述方法还包括：在所述第二小区上向所述接入网设备发送第四信息，所述第四信息承载于第一资源，所述第一资源为所述终端设备触发的小区切换所对应的资源。
在一种可能的设计中，所述方法还包括：在所述第一小区上接收来自所述接入网设备的使能信息，所述使能信息用于使能所述终端设备在所述终端设备的服务小区的无线链路出现问题后触发小区切换。
如此，可以由接入网设备通过使能信息来控制终端设备是否在所述终端设备的服务小区的无线链路出现问题后触发小区切换，从而便于接入网设备灵活控制终端设备的行为。
在一种可能的设计中，所述至少一个候选小区包括：层1/层2切换对应的候选小区，和/或，层3切换对应的候选小区。
第二方面，本申请实施例提供一种通信方法，该方法可以应用于第二DU或者第二DU中的模块，以该方法应用于第二DU为例，在该方法中，第二DU确定终端设备已从第一小区切换至第二小区，所述切换为所述终端设备触发的小区切换。当所述第一小区和所述第二小区属于不同DU时，向CU发送第一指示信息，所述第一指示信息指示所述终端设备已从第一小区切换至第二小区，便于CU获知终端设备已从第一小区切换至第二小区。或者，当所述第一小区和所述第二小区都属于所述第二DU时，向所述CU发送所述第一指示信息和第四指示信息，所述第四指示信息指示所述第二DU未向所述终端设备成功发送的数据包，从而使得CU可以在终端设备执行切换后，根据第二DU未向终端设备成功发送的数据包，来向终端设备发送数据包，以避免数据包丢失或重传。
在一种可能的设计中，确定终端设备已从第一小区切换至第二小区，包括：接收来自所述终端设备的第三信息，所述第三信息用于指示确定终端设备已从第一小区切换至第二 小区；或者，接收来自所述终端设备的第四信息，所述第四信息承载于所述第一资源，所述第一资源为所述终端设备触发的小区切换所对应的资源。
在一种可能的设计中，所述第一指示信息包括所述第二DU已经缓存的数据量信息；或者，所述方法还包括：向所述CU发送所述第二DU已经缓存的数据量信息。
如此，通过向CU发送第二DU已经缓存的数据量信息，便于CU控制通过第二DU向终端设备发送下行数据的流量。
在一种可能的设计中，所述第三指示信息包括以下至少一项：未成功发送的PDCP PDU的序列号；已成功发送的PDCP PDU的最高序列号。
在一种可能的设计中，所述第三指示信息承载于用户面数据帧，或者控制面消息。
第三方面，本申请实施例提供一种通信方法，该方法可以应用于CU或者CU中的模块，以该方法应用于CU为例，在该方法中，CU向第一DU发送第二指示信息，所述第二指示信息指示终端设备已从第一小区切换至第二小区，所述切换为所述终端设备触发的小区切换，所述第一小区属于所述第一DU，所述第二小区属于第二DU；接收来自所述第一DU的第三指示信息，所述第三指示信息指示所述第一DU未向所述终端设备成功发送的数据包；根据所述第三指示信息，通过所述第二DU向所述终端设备发送所述数据包。
如此，由于CU可以接收第三指示信息，从而使得CU可以在终端设备执行切换后，根据第一DU未向终端设备成功发送的数据包，来向终端设备发送数据包，以避免数据包丢失或重传。
在一种可能的设计中，所述方法还包括：接收来自所述第二DU的第一指示信息，所述第一指示信息指示终端设备已从第一小区切换至第二小区。
在一种可能的设计中，所述第三指示信息包括以下至少一项：未成功发送的PDCP PDU的序列号；已成功发送的PDCP PDU的最高序列号。
第四方面，本申请实施例提供一种通信方法，该方法可以应用于第一DU或者第一DU中的模块，以该方法应用于第一DU为例，在该方法中，第一DU接收来自CU的第二指示信息，所述第二指示信息指示终端设备已从第一小区切换至第二小区，所述切换为所述终端设备触发的小区切换，所述第一小区属于第一DU，所述第二小区属于第二DU；根据所述第二指示信息，向所述CU发送第三指示信息，所述第三指示信息指示所述第一DU未向所述终端设备成功发送的数据包。
如此，由于第一DU可以向CU发送第三指示信息，从而使得CU可以在终端设备执行切换后，根据第一DU未向终端设备成功发送的数据包，来向终端设备发送数据包，以避免数据包丢失或重传。
在一种可能的设计中，所述第三指示信息包括以下至少一项：未成功发送的PDCP PDU的序列号；已成功发送的PDCP PDU的最高序列号。
第五方面，本申请实施例提供一种通信方法，该方法可以应用于第一DU或者第一DU中的模块，以该方法应用于第一DU为例，在该方法中，第一DU向终端设备发送切换指令，所述切换指令指示所述终端设备从第一小区切换至第二小区，所述第一小区属于第一DU，所述第二小区属于第二DU；向CU发送第三指示信息，所述第三指示信息指示所述第一DU未向所述终端设备成功发送的数据包。
在一种可能的设计中，所述切换指令包括所述第二DU向所述终端设备发送下行数据所使用的下行波束信息。
第六方面，本申请实施例提供一种通信方法，该方法可以应用于CU或者CU中的模块，以该方法应用于CU为例，在该方法中，CU接收来自第一DU的通知信息和第三指示信息，所述通知信息用于通知CU：终端设备已从第一小区切换至第二小区，所述第三指示信息指示所述第一DU未向所述终端设备成功发送的数据包；所述第一小区属于所述第一DU，所述第二小区属于第二DU；通过所述第二DU向所述终端设备发送所述数据包。
在一种可能的设计中，所述方法还包括：接收所述第二DU已经缓存的数据量信息。
第七方面，本申请实施例提供一种通信方法，该方法可以应用于第二DU或者第二DU中的模块，以该方法应用于第二DU为例，在该方法中，第二DU接收来自终端设备的切换完成信息，所述切换完成信息用于指示所述终端设备已从第一小区切换至第二小区；所述第一小区属于第一DU，所述第二小区属于第二DU；根据所述切换完成信息，向CU发送所述第二DU已经缓存的数据量信息。
在一种可能的设计中，所述切换完成信息包括所述第二DU向所述终端设备发送下行数据所使用的下行波束信息。
第八方面，本申请提供一种通信装置，所述通信装置比如为终端设备，所述通信装置具备实现上述第一方面的功能，比如，所述通信装置包括执行上述第一方面涉及操作所对应的模块或单元或手段(means)，所述模块或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以用于收发信号，以实现该通信装置和其它装置之间的通信；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单元执行的功能可以和上述第一方面涉及的操作相对应。
在一种可能的设计中，所述通信装置包括处理器，处理器可以用于与存储器耦合。所述存储器可以保存实现上述第一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面中任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述第一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第一方面中任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和接口电路，其中，处理器用于通过所述接口电路与其它装置通信，并执行上述第一方面中任意可能的设计或实现方式中的方法。
第九方面，本申请提供一种通信装置，所述通信装置比如为接入网设备，接入网设备可以包括CU和一个或多个DU。所述通信装置具备实现上述第二方面至第七方面中任一方面涉及的功能，比如，所述通信装置包括执行上述第二方面至第七方面中任一方面涉及操作所对应的模块或单元或手段，所述功能或单元或手段可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现。
在一种可能的设计中，所述通信装置包括处理单元、通信单元，其中，通信单元可以用于收发信号，以实现该通信装置和其它装置之间的通信，比如，通信单元用于向终端设备发送***信息；处理单元可以用于执行该通信装置的一些内部操作。处理单元、通信单 元执行的功能可以和上述第二方面至第七方面中任一方面涉及的操作相对应。
在一种可能的设计中，所述通信装置包括处理器，处理器可以用于与存储器耦合。所述存储器可以保存实现上述第二方面至第七方面中任一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面至第七方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和存储器，存储器可以保存实现上述第二方面至第七方面中任一方面涉及的功能的必要计算机程序或指令。所述处理器可执行所述存储器存储的计算机程序或指令，当所述计算机程序或指令被执行时，使得所述通信装置实现上述第二方面至第七方面任意可能的设计或实现方式中的方法。
在一种可能的设计中，所述通信装置包括处理器和接口电路，其中，处理器用于通过所述接口电路与其它装置通信，并执行上述第二方面至第七方面任意可能的设计或实现方式中的方法。
可以理解地，上述第八方面和第九方面中，处理器可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。此外，以上处理器可以为一个或多个，存储器可以为一个或多个。存储器可以与处理器集成在一起，或者存储器与处理器分离设置。在具体实现过程中，存储器可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
第十方面，本申请提供一种通信***，该通信***可以包括上述第八方面所提供的通信装置，还可以包括上述第九方面所提供的通信装置。
第十一方面，本申请提供一种计算机可读存储介质，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得计算机执行上述第一方面至第七方面的任一种可能的设计中的方法。
第十二方面，本申请提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述第一方面至第七方面的任一种可能的设计中的方法。
第十三方面，本申请提供一种芯片，所述芯片包括处理器，所述处理器与存储器耦合，用于读取并执行所述存储器中存储的软件程序，以实现上述第一方面至第七方面的任一种可能的设计中的方法。
本申请的这些方面或其它方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为本申请实施例适用的一种通信***示意图；
图2A为本申请实施例提供的一种CU-DU分离架构的示意图；
图2B为本申请实施例提供的又一种CU-DU分离架构的示意图；
图3为本申请实施例提供的通信方法所对应的流程示意图；
图4为本申请实施例提供的通信方法所对应的流程示意图；
图5为本申请实施例提供的通信方法所对应的流程示意图；
图6为本申请实施例提供的通信方法所对应的流程示意图；
图7为本申请实施例提供的通信方法所对应的流程示意图；
图8为本申请实施例中所涉及的装置的可能的示例性框图；
图9为本申请实施例提供的一种接入网设备的结构示意图；
图10为本申请实施例提供的一种终端设备的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
图1为本申请实施例适用的一种通信***示意图。如图1所示，通信***10包括一个或多个接入网设备20，以及一个或多个终端设备30。其中，接入网设备与终端设备之间的接口可以为Uu接口(或称为空口)，接入网设备20与终端设备30之间可以通过空口资源进行数据传输。示例性地，终端设备可以位于接入网设备的一个或多个小区的通信覆盖范围内，为终端设备提供服务的小区可以为一个或多个，当为终端设备提供服务的小区有多个时，终端设备可以按照载波聚合(carrier aggregation，CA)、双连接(dual connectivity，DC)、协作多点(coordinated multipoint，CoMP)传输、多传输接收点(multiple transmission and reception point，mTRP)等传输技术中的一种或多种工作。
(1)终端设备
终端设备又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是指向用户提供语音和/或数据连通性的设备。例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端设备的举例为：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
(2)接入网设备
接入网设备是指将终端接入到无线网络的无线接入网(radio access network，RAN)节点(或设备)，又可以称为基站。目前，一些RAN节点的举例为：节点B(Node B，NB)、继续演进的节点B(gNB)、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。
(3)终端设备与接入网设备之间的通信
终端设备与接入网设备之间的通信遵循一定的协议层结构，例如控制面协议层结构可以包括无线资源控制(radio resource control，RRC)层、分组数据汇聚层协议(packet data convergence protocol，PDCP)层、无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理层(physical layer，PHY)；用户面协议层结构可以包括PDCP层、RLC层、MAC层和物理层，在一种可能的实现中，PDCP层之上还可以包括业务数据适配(service data adaptation protocol，SDAP)层。其中，SDAP层、 PDCP层、RLC层、MAC层、物理层也可以统称为接入层。有关上述各个协议层的具体描述，可以参考第三代合作伙伴计划(3rd generation partnership project，3GPP)的相关技术规范。
(4)CU-DU分离架构
示例性地，在一些可能的网络结构中，接入网设备可以包括一个或多个集中单元(centralized unit，CU)和一个或多个分布单元(distributed unit，DU)，多个DU可以由一个CU集中控制，该种架构可以称为CU-DU分离架构。作为示例，CU和DU之间的接口可以称为F1接口，其中，控制面(control panel，CP)接口可以为F1-C接口，用户面(user panel，UP)接口可以为F1-U接口。
CU和DU的处理功能可以根据无线网络的协议层划分：比如图2A所示，PDCP层及以上协议层的功能设置在CU，PDCP层以下协议层(例如RLC层和MAC层等)的功能设置在DU。可以理解的，上述对CU和DU的处理功能按照协议层的划分仅仅是一种举例，也可以按照其他的方式进行划分，比如RLC层以上协议层的功能设置在CU，RLC层及以下协议层的功能设置在DU，又比如可以将CU或者DU划分为具有更多协议层的功能，又比如CU或DU还可以划分为具有协议层的部分处理功能。本申请实施例对此并不进行限定。
进一步地，CU的功能可以由一个实体来实现，或者也可以由不同的实体来实现。例如，可以对CU的功能进行进一步切分，即将控制面和用户面分离并通过不同实体来实现，分别为控制面CU实体(即CU-CP实体)和用户面CU实体(即CU-UP实体)，CU-CP实体和CU-UP实体可以与DU相耦合，共同完成RAN设备的功能。CU-CP实体与CU-UP实体之间的接口可以为E1接口，CU-CP实体与DU之间的接口可以为F1-C接口，CU-UP实体与DU之间的接口可以为F1-U接口。其中，一个DU和一个CU-UP可以连接到一个CU-CP。在同一个CU-CP控制下，一个DU可以连接到多个CU-UP，一个CU-UP可以连接到多个DU，在多个CU-CP协作下，一个CU-UP也可以连接到协作的多个CU-CP，从而提升CU-CP的弹性。图2B为一种空口协议栈分布示意图。如图2B所示，针对用户面和控制面来说，空口协议栈都可以是RLC、MAC、PHY在DU，PDCP及以上协议层在CU。
需要说明的是：在上述图2A和图2B所示意的架构中，CU产生的信令可以通过DU发送给终端设备，或者终端设备产生的信令可以通过DU发送给CU。DU可以不对该信令进行解析而直接通过协议层封装后透传给终端设备或CU。以下实施例中如果涉及这种信令在DU和终端设备之间的传输，此时，DU对信令的发送或接收包括这种场景。例如，RRC或PDCP层的信令最终会处理为物理层的数据发送给终端设备，或者，由接收到的物理层的数据转变而来。在这种架构下，该RRC层或PDCP层的信令，即也可以认为是由DU发送的，或者，由DU和射频装置发送的。
可以理解的是，本申请实施例对通信***中所包括的接入网设备的数量、终端设备的数量不作限定，而且上述通信***中除了包括接入网设备和终端设备以外，还可以包括其它设备或网元，如核心网设备、中继设备等，对此本申请实施例也不作限定。
上述图1所示意的通信***可以支持各种无线接入技术(radio access technology，RAT)，例如图1所示意的通信***可以为***(4th generation，4G)通信***(也可以称为长期演进(long term evolution，LTE)通信***)，第五代(5th generation，5G) 通信***(也可以称为新无线(new radio，NR)通信***)，无线保真(wireless fidelity，Wi-Fi)***，或者是面向未来的演进***。本申请实施例描述的通信***以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着通信***的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面先对本申请实施例所涉及的相关技术特征进行解释说明。需要说明的是，这些解释是为了让本申请实施例更容易被理解，而不应该视为对本申请所要求的保护范围的限定。
一、小区切换
小区切换可以包括基于层1/层2实现的小区切换(简称为层1/层2切换)和基于层3实现的小区切换(简称为层3切换)。其中，基于层1/层2实现的小区切换可以是指基于层1或层2实现的小区切换，或者也可以是指基于层1和层2实现的小区切换。层1可以是指物理层，层2可以是指MAC层，层3可以是指RRC层。
进一步地，层1/层2切换可以包括如下两种：
(1)接入网设备触发的层1/层2切换。比如，接入网设备根据终端设备上报的波束级测量结果，从层1/层2切换对应的候选小区中选择一个满足层1/层2切换准则的目标小区，并向终端设备发送层1/层2的切换指令，以指示终端设备切换到目标小区。其中，波束级测量结果也可以称为层1测量结果。
(2)终端设备触发的层1/层2切换，也可以称为层1/层2的条件切换(conditional handover，CHO)。比如，终端设备根据波束级测量结果，从层1/层2切换对应的候选小区中选择一个满足层1/层2切换准则的目标小区，并自主切换到目标小区，而无需接入网设备下发切换指令。
层3切换可以包括如下两种：
(1)接入网设备触发的层3切换。比如，接入网设备根据终端设备上报的小区级测量结果，从层3切换对应的候选小区中选择一个满足层3切换准则的目标小区，并向终端设备发送层3的切换指令，以指示终端设备切换到目标小区。其中，小区级测量结果也可以称为层3测量结果。
(2)终端设备触发的层3切换，也可以称为层3的CHO；比如，终端设备根据小区级测量结果，从层3切换对应的候选小区中选择一个满足层3切换准则的目标小区，并自主切换到目标小区，而无需接入网设备下发切换指令。
二、波束级测量结果、小区级测量结果
作为一种可能的实现，终端设备获取波束级测量结果的过程可以为：接入网设备在小区的多个波束方向发送参考信号，参考信号可以是同步信号/物理广播信道块(synchronization signal/physical broadcast channel block，SSB)、信道状态信息参考信号(channel state information reference signal，CSI-RS)、或者信道探测参考信号(sounding reference signal，SRS)，也可以是其它可能的参考信号，具体不做限定。相应地，终端设备根据接入网设备指示的时频资源上的参考信号进行测量，例如终端设备可以通过采样获取一段时间内多个瞬间的参考信号对应波束的信号强度，对获取的多个信号强度进行加权或者合并，进而得到该波束的测量结果，波束的测量结果也可以称为波束质量(beam  quality)；进一步地，还可以通过层1滤波对该波束的测量结果进行滤波得到该波束滤波后的测量结果，其中，层1滤波的参数比如可以是接入网设备为终端设备配置的。或者，终端设备也可以对获取的多个信号强度进行滤波，进而得到该波束滤波后的测量结果。小区级测量结果可以是终端设备通过对小区的多个波束的测量结果进行合并或者加权得到的，比如，可以通过接入网设备配置对该小区的至少一个波束进行合并得到该小区的测量结果，小区的测量结果也可以称为小区质量(cell quality)；进一步地，还可以通过层3滤波对该小区的测量结果进行滤波得到该小区滤波后的测量结果，其中，层3滤波的参数比如可以是接入网设备为终端设备配置的。
三、无线链路失败
为了保持终端设备与接入网设备之间通信的可靠性，终端设备需要在服务小区上进行无线链路监测(radio link monitoring，RLM)，并根据无线链路监测结果，确定是否发生无线链路失败(radio link failure，RLF)。
比如，当终端设备的物理层检测到服务小区的无线链路质量在一个时间窗口(为便于描述，下文将该时间窗口称为第三时间窗口)内小于失步阈值时，可以向RRC层上报一次“失步指示”；当检测到服务小区的无线链路质量在一个第三时间窗口内大于或等于同步阈值时，可以向RRC层上报一次“同步指示(in-sync indication)”。进一步地，若终端设备在RRC层连续检测到的“失步指示”次数高于一个阈值(比如该阈值为N310)，则启动定时器1(比如定时器1为T310)，若在定时器1的定时窗口内未检测到“同步指示”，则可以确定发生RLF；若定时器1已经启动，并且正在运行中，则当终端设备在RRC层连接检测到“同步指示”次数大于或等于一个阈值(比如该阈值为N311)时，终端设备可以停止定时器1，并认为无线链路已经恢复，不会触发RLF。其中，N310、N311、定时器1的定时窗口的时长和第三时间窗口的时长可以是接入网设备为终端设备配置的。
可以理解的是，上述描述了一种发生RLF的情形示例。终端设备还可以在其它可能的情形下确定发生RLF，比如终端设备还可以在以下至少一个条件满足时，确定发生RLF：(1)随机接入出现问题，比如终端设备发起随机接入的失败次数大于或等于预设阈值；(2)RLC层重传超过最大次数；(3)连续上行先听后说(listen before talk，LBT)失败，即终端设备连续多次未抢占到信道。
四、无线链路质量
无线链路质量可以是指物理层信道质量，比如物理下行控制信道(physical downlink control channel，PDCCH)质量或物理下行共享信道(physical downlink shared channel，PDSCH)质量。
示例性地，无线链路质量可以是根据波束级测量结果得到的。比如，终端设备对小区1进行波束级测量，得到小区1的N1个波束的测量结果，则终端设备可以将N1个波束中至少一个波束的测量结果的平均值作为小区1的无线链路质量，或者终端设备也可以将N1个波束中测量结果较好的N2个波束的测量结果的平均值作为小区1的无线链路质量。其中，N1、N2为正整数，且N2小于N1。
基于上述相关技术特征的描述，本申请实施例将对终端设备恢复无线链路的实现进行研究。
本申请实施例提供的一种可能的通信方法为：当终端设备检测到服务小区的无线链 路出现问题后，终端设备可以通过小区选择(cell selection)过程选择一个满足小区选择准则的目标小区，并执行RRC重建接入该目标小区，从而恢复无线链路。
下面结合图3描述一种可能的实现流程。
图3为本申请实施例提供的通信方法所对应的流程示意图。如图3所示，该方法包括：
S301，接入网设备确定接入网设备管理的第一小区为终端设备的服务小区后，可以在第一小区上向终端设备发送配置信息1。
示例性地，接入网设备向终端设备发送配置信息1的方式可以有多种，比如接入网设备可以在第一小区上向终端设备发送RRC消息，该RRC消息包括配置信息1。
配置信息1可以包括第一小区的配置信息和终端设备的至少一个候选小区的配置信息。示例性地，至少一个候选小区可以包括：层1/层2切换对应的候选小区，和/或，层3切换对应的候选小区。
以其中一个候选小区为例，候选小区的配置信息可以包括终端设备在候选小区上的配置信息，还可以包括其它可能的信息，比如候选小区的相关信息，具体不做限定。此外，第一小区的配置信息可以参照候选小区的配置信息，不再赘述。
其中，(1)终端设备在候选小区上的配置信息可以包括以下至少一项：终端设备在候选小区上的无线资源配置信息；终端设备在候选小区上的无线承载(radio bearer，RB)配置信息；终端设备在候选小区上的多连接(multi-connectivity，MC)配置信息，其中，多连接可以是DC，CA，CoMP,mTRP中的一种或者多种组合；候选小区为终端设备分配的小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)。(2)候选小区的相关信息可以包括以下至少一项：候选小区的参考信号配置信息(例如SSB配置信息，CSI-RS配置信息，SRS配置信息)；候选小区的波束测量配置信息，比如传输配置指示(transmission configuration indicator，TCI)状态配置信息；候选小区的物理小区标识(physical cell identity，PCI)。
可以理解的是，第一小区和候选小区所属的接入网设备可以相同；或者，第一小区和候选小区所属的接入网设备也可以不同。当第一小区和候选小区所属的接入网设备不同时，第一小区所属的接入网设备可以通过Xn接口从候选小区所属的接入网设备获取候选小区的配置信息。
S302，终端设备在第一小区上进行无线链路监测，并根据无线链路监测结果，确定发生RLF。其中，终端设备确定发生RLF的具体实现可以参见上文的描述。
此处，终端设备确定发生RLF后，会释放第一小区的配置信息(比如挂起所有的无线承载的传输，即无法通过无线承载传输控制面信令和用户面业务数据)，以及还会释放接入网设备在第一小区上给终端设备发送的至少一个候选小区的配置信息。
S303，终端设备执行小区选择过程，并通过小区选择过程选择一个满足小区选择准则的小区(比如第二小区)后，终端设备会主动在第二小区发起RRC连接重建立过程，比如终端设备通过随机接入过程在第二小区上向接入网设备发送RRC连接重建立请求消息。
其中，小区选择过程的具体实现可以参见现有技术。
S304，接入网设备在第二小区上接收到来自终端设备的RRC连接重建立请求消息后，可以向终端设备发送RRC连接重建消息，RRC连接重建消息用于指示终端设备当前接入的第二小区为终端设备的新服务小区。
S305，终端设备接收到RRC连接重建消息后，向接入网设备发送RRC连接重建完成 消息。
S306，当终端设备完成RRC重建过程后，接入网设备可以在第二小区上向终端设备发送第二小区的配置消息；相应地，终端设备可以接收第二小区的配置信息。
S307，终端设备根据第二小区的配置信息与接入网设备进行通信(即恢复无线链路)，比如恢复无线承载的传输。
根据图3所示意的流程可以看出，终端设备可以执行RRC重建来恢复无线链路。然而，在RRC重建过程中，一方面，由于终端设备会释放至少一个候选小区的配置信息，因此，即使终端设备选择其中一个候选小区作为新服务小区，接入网设备仍需重新向终端设备发送新服务小区的配置信息，从而导致传输资源的消耗较大；另一方面，由于终端设备需要释放第一小区的配置信息(比如挂起所有的无线承载的传输)，并在RRC重建完成后，方可恢复无线承载的传输，从而会导致通信中断的时延较大。
本申请实施例提供的又一种可能的通信方法为：当终端设备检测到服务小区的无线链路出现问题后，终端设备可以选择一个目标小区，若目标小区属于小区切换对应的候选小区，则终端设备可以执行小区切换以切换到目标小区，从而恢复无线链路；若目标小区不属于小区切换对应的候选小区，则终端设备可以执行RRC重建接入目标小区，从而恢复无线链路。
需要说明的是，此处“终端设备选择目标小区”的实现可以不同于前文层1/层2的CHO中终端设备选择目标小区的实现，以及不同于前文层3的CHO中终端设备选择目标小区的实现。而当目标小区属于层1/层2切换对应的候选小区时，此处“终端设备切换到目标小区”的实现可以与前文层1/层2的CHO中终端设备切换到目标小区的实现相同；当目标小区属于层3切换对应的候选小区时，此处“终端设备切换到目标小区”的实现可以与前文层3的CHO中终端设备切换到目标小区的实现相同。
下面结合实施例一对上述通信方法的一些可能实现进行描述。
实施例一
图4为本申请实施例一提供的通信方法所对应的流程示意图。如图4所示，该方法包括：
S401，接入网设备在第一小区上向终端设备发送至少一个候选小区的配置信息；相应地，终端设备可以在第一小区上接收至少一个候选小区的配置信息。具体可以参照S301。
示例性地，接入网设备还可以在第一小区上向终端设备发送使能信息，使能信息用于使能终端设备在服务小区的无线链路出现问题后触发小区切换；相应地，终端设备可以接收使能信息，进而可以执行图4所示意的后续方法流程，否则(即接入网设备未向终端设备发送使能信息，相应地，终端设备也未接收到使能信息)，则可以参照图3。
S402，当终端设备确定第一小区的无线链路满足第一条件，选择第二小区，第二小区也可以称为目标小区。
示例性地，第一小区的无线链路质量满足第一条件，可以包括以下至少一项：(1)第一小区的无线链路质量小于第一阈值；(2)第一小区的无线链路质量在第一时间窗口内均小于所述第一阈值；(3)终端设备连续检测到失步指示的次数大于或等于第二阈值；(4)终端设备连续检测到失步指示的次数大于或等于第二阈值后，启动定时器2，在定时器2的定时窗口内，未检测到同步指示；(5)第一小区发生RLF。其中，“小于”可以替换为“低 于”，“大于”可以替换为“高于”。第一条件可以为接入网设备为终端设备配置的，比如接入网设备在第一小区上向终端设备发送第一信息，第一信息用于配置第一条件(比如第一信息包括第一阈值、第二阈值、定时器2的定时窗口的时长和第一时间窗口的时长)。第一阈值可以不同于失步阈值，第二阈值可以不同于N310，第一时间窗口和第三时间窗口可以相同，或者也可以不同，具体不做限定。
终端设备选择第二小区的具体实现可以有多种，下面以“至少一个候选小区包括层1/层2切换对应的候选小区和层3切换对应的候选小区，其中，层1/层2切换对应的候选小区包括小区a、小区b，层3切换对应的候选小区包括小区b、小区c”为例，结合实现方式1和实现方式2描述两种可能的实现。可以理解的是，至少一个候选小区也可以仅包括层1/层2切换对应的候选小区，即{小区a、小区b}；或者，至少一个候选小区也可以仅包括层3切换对应的候选小区，即{小区b、小区c}。比如，可以由接入网设备为终端设备配置至少一个候选小区仅包括层1/层2对应的候选小区，或者仅包括层3切换对应的候选小区，又或者包括层1/层2对应的候选小区和层3对应的候选小区；或者也可以由协议来约定。
实现方式1
终端设备可以根据至少一个候选小区(即{小区a、小区b、小区c})的无线链路质量或小区级测量结果，从{小区a、小区b、小区c}中选择第二小区。
针对于终端设备根据至少一个候选小区的无线链路质量，从至少一个候选小区中选择第二小区，一种可能的实现为：终端设备根据{小区a、小区b、小区c}的无线链路质量，判断{小区a、小区b、小区c}中是否存在无线链路质量满足第二条件的小区。若{小区a、小区b、小区c}中存在无线链路质量满足第二条件的小区，则将该小区作为第二小区，此种情形下，第二小区属于至少一个候选小区，即第二小区为{小区a、小区b、小区c}中的一个小区。其中，第二小区的无线链路质量满足第二条件，可以包括以下至少一项：(1)第二小区的无线链路质量大于或等于第三阈值；(2)第二小区的无线链路质量在第二时间窗口内均大于或等于第三阈值；(3)第二小区的无线链路质量大于或等于至少一个候选小区中除第二小区之外的其它候选小区的无线链路质量；(4)第二小区的无线链路质量在第二时间窗口内均大于或等于至少一个候选小区中除第二小区之外的其它候选小区的无线链路质量；(5)第二小区的无线链路质量大于第一小区的无线链路质量；(6)第二小区的无线链路质量在第二时间窗口内均大于第一小区的无线链路质量；(7)第二小区的无线链路质量大于第一小区的无线链路质量与偏移量之和；(8)第二小区的无线链路质量在第二时间窗口内始终大于第一小区的无线链路质量与偏移量之和。其中，偏移量可以为正值，或者也可以为负值。
可以理解的是，至少一个候选小区中可能仅有一个小区满足第二条件，或者也可能有多个小区满足第二条件。当至少一个候选小区中有多个小区满足第二条件时，比如{小区a、小区b、小区c}中小区a和小区b都满足第二条件，此种情形下，可以存在以下三种方式；其中，方式1：终端设备可以根据小区a和小区b的波束级测量结果从小区a和小区b中选择一个小区作为第二小区；比如，若小区a存在一个波束(称为波束1)，波束1的测量结果优于小区b的所有波束的测量结果，则可以选择小区a作为第二小区。方式2：终端设备可以根据小区a和小区b的小区级测量结果从小区a和小区b中选择一个小区作为第二小区；比如，若小区a的测量结果优于小区b的测量结果，则可以选择小区a作为第二小区。方式3：取决于终端设备的内部实现，即由终端设备自行决定选择小区a或 小区b作为第二小区。比如，可以由协议约定具体采用方式1、方式2和方式3中的哪种方式，或者也可以由接入网设备指示终端设备具体采用哪种方式。
此外，若{小区a、小区b、小区c}中不存在无线链路质量满足第二条件的小区，即终端设备从{小区a、小区b、小区c}未选择出合适的小区，则终端设备可以执行小区选择过程，并通过小区选择过程选择一个满足小区选择准则的小区，该小区即为第二小区，此种情形下，第二小区不属于至少一个候选小区，即第二小区为{小区a、小区b、小区c}以外的小区。
针对于终端设备根据至少一个候选小区的小区级测量结果，从至少一个候选小区中选择第二小区，一种可能的实现为：终端设备根据{小区a、小区b、小区c}的小区级测量结果，判断{小区a、小区b、小区c}中是否存在小区级测量结果满足第三条件的小区。若{小区a、小区b、小区c}中存在小区级测量结果满足第三条件的小区，则将该小区作为第二小区，此种情形下，第二小区为{小区a、小区b、小区c}中的一个小区。其中，第二小区的小区级测量结果满足第三条件，可以包括以下至少一项：(1)第二小区的小区级测量结果大于或等于第四阈值；(2)第二小区的小区级测量结果大于或等于至少一个候选小区中除第二小区之外的其它候选小区的小区级测量结果；(3)第二小区的小区级测量结果大于第一小区的小区级测量结果。
此外，若{小区a、小区b、小区c}中不存在小区级测量结果满足第三条件的小区，即终端设备从{小区a、小区b、小区c}未选择出合适的小区，则终端设备可以执行小区选择过程，并通过小区选择过程选择一个满足小区选择准则的小区，该小区即为第二小区，此种情形下，第二小区不属于至少一个候选小区。需要说明的是：通常情况下，终端设备是在空闲态下执行小区选择过程，此种情形下，终端设备可以按照第一测量周期执行小区选择过程；而本申请实施例中，终端设备是在连接态执行小区选择过程以选择一个合适的目标小区，此种情形下，终端设备可以按照第二测量周期执行小区选择过程，第二测量周期可以小于第一测量周期，比如本申请实施例中终端设备可以根据小区的实时无线链路质量执行小区选择过程。
作为一种可能的实现，接入网设备可以向终端设备发送第二信息，第二信息用于指示终端设备根据无线链路质量选择第二小区，可选地，第二信息还可以配置第二条件，比如第二信息可以包括第三阈值、偏移量、第二时间窗口的时长等。相应地，终端设备接收到第二信息后，可以根据至少一个候选小区的无线链路质量选择第二小区。否则(即接入网设备未向终端设备发送第二信息，相应地，终端设备也未接收到第二信息)，则终端设备可以根据至少一个候选小区的小区级测量结果选择第二小区。
实现方式2
终端设备可以根据第二候选小区列表所包括的小区的无线链路质量或小区级测量结果，从第二候选小区列表所包括的小区中选择第二小区。其中，第二候选小区列表可以与第一候选小区列表不同，第一候选小区列表包括至少一个候选小区，即第一候选小区列表可以为{小区a、小区b、小区c}。在一个示例中，第二候选小区列表除包括第一候选小区列表所包括的全部小区外，还可以包括其它小区，比如第二候选小区列表为{小区a、小区b、小区c、小区d}。此种情形下，终端设备选择的第二小区的实现可以参照实现方式1，终端设备选择的第二小区可能属于至少一个候选小区，也可能不属于至少一个候选小区。
示例性地，第二候选小区列表可以为接入网设备为终端设备配置的，比如接入网设备 可以向终端设备发送小区列表配置信息，小区列表配置信息用于配置第二候选小区列表。
进一步地，若终端设备确定选择的第二小区属于至少一个候选小区(比如第二小区为小区a、小区b或小区c)，则可以挂起所有的无线承载的传输，但并不释放至少一个候选小区的配置信息，后续可以执行S403A来恢复无线链路。若终端设备确定选择的第二小区不属于至少一个候选小区(比如第二小区为小区d)，则可以挂起所有的无线承载的传输，并释放至少一个候选小区的配置信息，后续可以执行S403B来恢复无线链路。
S403A，终端设备从第一小区切换至第二小区，并根据第二小区的配置信息在第二小区上与接入网设备进行通信。
此处，若第二小区为小区a，则终端设备可以执行层1/层2切换从第一小区切换到第二小区。若第二小区为小区c，则终端设备可以执行层3切换从第一小区切换到第三小区。若第二小区为小区b(即第二小区既是层1/层2切换对应的候选小区，也是层3切换对应的候选小区)，则可以存在以下三种方式；其中，方式1：终端设备执行层1/层2切换从第一小区切换到第二小区；方式2：终端设备执行层3切换从第一小区切换到第二小区；方式3：取决于终端设备的内部实现，即由终端设备自行决定执行层1/层2切换从第一小区切换到第二小区或者执行层3切换从第一小区切换到第二小区。比如，可以由协议约定具体采用方式1、方式2和方式3中的哪种方式，或者也可以由接入网设备指示终端设备具体采用哪种方式。
示例性地，终端设备从第一小区切换至第二小区后，可以在第二小区上通知接入网设备：终端设备已从第一小区切换至第二小区，且该切换为终端设备触发的小区切换，比如该切换为终端设备基于上述方式(比如实现方式1或实现方式2)选择第二小区而触发的小区切换。具体的通知方式可以有多种，比如通知方式1和通知方式2。
通知方式1：终端设备可以在第二小区上向接入网设备发送第三信息，第三信息用于指示终端设备已从第一小区切换至第二小区，且该切换为终端设备触发的小区切换。也就是说，终端设备可以通过显式方式通知接入网设备。其中，第三信息可以包括以下至少一项：终端设备的标识；第一小区的标识(即源小区的标识)；指示信息a，指示信息a指示终端设备触发的小区切换。示例性地，第三信息可以承载于终端设备在第二小区上发起的随机接入过程中的消息。比如，若随机接入过程为四步随机接入过程，则第三信息可以承载于四步随机接入过程中的消息3；若随机接入过程为两步随机接入过程，则第三信息可以承载于两步随机接入过程中的消息A。进一步可选地，第三信息可以承载于消息3或消息A中的MAC控制元素(control element，CE)。或者，第三信息也可以承载于随机接入过程以外的其它消息。
通知方式2：终端设备可以在第二小区上向接入网设备发送第四信息，第四信息承载于第一资源，第一资源为终端设备触发的小区切换所对应的资源。也就是说，终端设备可以通过隐式方式通知接入网设备。第四信息可以承载于终端设备在第二小区上发起的随机接入过程中的消息(比如消息3或消息A)，或者也可以承载于随机接入过程以外的其它消息。示例性地，第一资源可以为物理上行控制信道(physical uplink control channel，PUCCH)资源，第一资源可以为接入网设备为终端设备配置的，比如接入网设备可以在第一小区上向终端设备发送第五信息，第五信息用于配置第一资源。
示例性地，终端设备从第一小区切换至第二小区后，还可以在第二小区上向接入网设备发送下行波束信息，下行波束信息用于指示接入网设备在第二小区上向终端设备发送下 行数据所使用的下行波束。该下行波束可以是比目标SSB对应的波束更窄的波束，目标SSB可以是终端设备在第二小区上发起随机接入所使用的随机接入资源关联的SSB。比如，下行波束信息可以包含在上述第三信息或第四信息中，或者也可以是终端设备额外发送给接入网设备的，具体不做限定。
其中，下行波束信息可以指示一个波束(比如第一波束)，第一波束可以是终端设备确定出的第二小区的多个波束中测量结果最优的波束，相应地，接入网设备可以根据下行波束信息，使用第一波束在第二小区上向终端设备发送下行数据。或者，下行波束信息也可以指示终端设备确定出的多个候选波束，相应地，接入网设备可以根据下行波束信息，从多个候选波束中选择一个下行波束(比如第二波束)，并使用第二波束在第二小区上向终端设备发送下行数据。
S403B，终端设备执行RRC重建接入第二小区。
此处，终端设备可以释放至少一个候选小区的配置信息，并在第二小区发起RRC连接重建立过程，具体实现可以参照图3。
可以理解的是，上述图4所示意的流程中，至少一个候选小区的配置信息、第一信息、第二信息、第五信息、使能信息等可以承载于同一消息，或者也可以承载于不同消息，具体不做限定。
采用上述实施例一中的方法，当终端设备检测到无线链路出现问题后，终端设备可以不释放至少一个候选小区的配置信息，当终端设备选择其中一个候选小区作为新服务小区后，终端设备可以根据新服务小区的配置信息与接入网设备进行通信，而无需接入网设备重新向终端设备发送新服务小区的配置信息，从而能够有效节省传输资源；以及，由于终端设备可以通过触发小区切换从源小区切换到新服务小区，相比于RRC重建流程来说，能够快速恢复通信，有效降低通信中断的时延。
上述实施例一中，是从接入网设备和终端设备通信的角度，描述了本申请实施例的实现流程。由于接入网设备可以包括CU和一个或多个DU，因此，下面结合实施例二，从CU、DU和终端设备通信的角度，描述一些可能实现流程。
实施例二
当接入网设备包括CU和一个或多个DU时，上述实施例一中的第一小区和第二小区可以属于CU管理的不同DU，比如第一小区属于第一DU，第二小区属于第二DU；或者也可以属于同一DU，比如第一小区和第二小区都属于第二DU。下面分别针对这两种情形，描述可能的流程。
情形1：第一小区属于第一DU，第二小区属于第二DU
图5为本申请实施例二提供的通信方法所对应的流程示意图，如图5所示，该方法包括：
S501，CU通过第一小区所属的第一DU向终端设备发送至少一个候选小区的配置信息，其中，第一小区为终端设备的服务小区。
示例性地，CU可以向第一DU发送RRC消息，进而第一DU将RRC消息转发给终端设备，RRC消息包括至少一个候选小区的配置信息。
S502，当终端设备确定第一小区的无线链路满足第一条件，选择第二小区。
此处，以第二小区属于至少一个候选小区为例进行描述。
S503，终端设备从第一小区切换至第二小区。
上述S501至S503的具体实现可以参照实施例一。
S504，第二DU确定终端设备已从第一小区切换至第二小区。
此处，第二DU确定终端设备已从第一小区切换至第二小区的实现可以有多种。比如，终端设备可以向第二DU发送第三信息，相应地，第二DU接收到来自终端设备的第三信息后，可以确定终端设备已从第一小区切换至第二小区。又比如，终端设备可以向第二DU发送第四信息，相应地，第二DU接收到来自终端设备的第四信息(第四信息承载于第一资源)后，可以确定终端设备已从第一小区切换至第二小区。具体实现可以参照实施例一。
S505，第二DU向CU发送第一指示信息，第一指示信息指示终端设备已从第一小区切换至第二小区。
可选地，第二DU还可以向CU发送第一下行数据传输状态(downlink data delivery status,DDDS)信息，第一DDDS信息用于CU控制通过第二DU向终端设备发送下行数据的流量，比如第一DDDS信息可以包括第二DU已经缓存的数据量。
示例性地，第一指示信息可以包括以下至少一项：终端设备的标识；第二小区的标识(即目标小区的标识)；指示信息b，指示信息b指示终端设备触发的小区切换。
其中，作为一种可能的实现，指示信息b可以为第一DDDS信息(即通过第一DDDS信息隐式指示终端设备触发的小区切换)，此种情形下，第一指示信息中的指示信息b可以通过F1接口的用户面数据帧传输，而其它信息(比如终端设备的标识和/或第二小区的标识)可以通过该用户面数据帧传输，或者也可以通过F1接口的控制面消息传输，具体不做限定。作为又一种可能的实现，指示信息b也可以为其它可能的信息，此种情形下，第一指示信息可以通过F1接口消息的控制面消息传输。
S506，CU向第一DU发送第二指示信息，第二指示信息指示终端设备已从第一小区切换至第二小区；相应地，第一DU接收第二指示信息，并停止与终端设备进行通信(比如停止向终端设备发送下行数据)。
示例性地，第二指示信息可以包括以下至少一项：终端设备的标识；第二小区的标识；指示信息c，指示信息c指示终端设备触发的小区切换。第二指示信息可以承载于F1接口的控制面消息。
S507，第一DU向CU发送第三指示信息，第三指示信息指示第一DU未向终端设备成功发送的数据包。进一步地，第一DU可以停止向终端设备发送下行数据。
示例性地，第三指示信息可以包括以下至少一项：第一DU未成功发送的PDCP PDU的序列号(sequence number,SN)；第一DU已成功发送的PDCP PDU的最高序列号。
示例性地，第三指示信息可以包含在第二DDDS信息中，通过F1接口的用户面数据帧传输；或者第三指示信息也可以通过F1接口的控制面消息传输，具体不做限定。
S508，CU根据第三指示信息，通过第二DU向终端设备发送数据包。
比如，若第三指示信息包括第一DU未成功发送的PDCP PDU的序列号，则CU可以通过第二DU重传这些序列号对应的PDCP PDU；若第三指示信息包括第一DU已成功发送的PDCP PDU的最高序列号，则CU可以通过第二DU向终端设备发送最高序列号之后的PDCP PDU。
此外，从第二DU的角度来看：终端设备还可以向第二DU发送下行波束信息(下行波束信息可以参照实施例一)，因此，在S505中，第二DU可以根据下行波束信息，使用 相应的下行波束向终端设备发送数据包。
情形2：第一小区和第二小区都属于第二DU
图6为本申请实施例二提供的通信方法所对应的流程示意图，如图6所示，该方法包括：
S601，CU通过第一小区所属的第二DU向终端设备发送至少一个候选小区的配置信息，其中，第一小区为终端设备的服务小区。
S602，当终端设备确定第一小区的无线链路满足第一条件，选择第二小区。
此处，以第二小区属于至少一个候选小区为例进行描述。
S603，终端设备从第一小区切换至第二小区。
上述S601至S603的具体实现可以参照实施例一。
S604，第二DU确定终端设备已从第一小区切换至第二小区。
S605，第二DU向CU发送第一指示信息和第四指示信息，第一指示信息指示终端设备已从第一小区切换至第二小区，第四指示信息指示第二DU未向终端设备成功发送的数据包。
此处，第四指示信息可以参照第三指示信息的描述。
S606，CU根据第二DU未向终端设备成功发送的数据包，通过第二DU向终端设备发送数据包。
图6所示意的上述步骤的具体实现可以参照图5。
采用上述实施例二中的方法，当终端设备检测到第一小区的无线链路出现问题后，可以从第一小区切换到第二小区(第二小区属于至少一个候选小区)，并根据在第一小区上接收到的第二小区的配置信息，与目标DU(即第二小区所属的DU)进行通信，而无需CU重新向终端设备发送第二小区的配置信息，从而能够有效节省传输资源，降低通信中断的时延。进一步地，由于源DU(即第一小区所属的DU)可以向CU发送指示信息以指示源DU未向终端设备成功发送的数据包，从而使得CU可以通过目标DU向终端设备发送这些未成功发送的数据包，有效避免数据包丢失的风险。
可以理解的是，上述实施例二中，“S501至S504”或“S601至S604”所描述的方案为：终端设备基于实施例一中的方式选择第二小区，并执行层1/层2切换从第一小区切换到第二小区，进而第二DU可以根据终端设备发送的第三信息或第四信息确定终端设备已从第一小区切换至第二小区。在其它可能的实施例中，“S501至S504”或“S601至S604”也可以替换为：终端设备通过层1/层2的CHO从第一小区切换到第二小区，进而第二DU可以根据终端设备发送的切换完成信息确定终端设备已从第一小区切换至第二小区。比如切换完成信息可以为层1/层2的消息，切换完成信息中可以包括下行波束信息；或者，终端设备也可以额外向第二DU发送下行波束信息。
实施例三
在实施例三中，将从CU、DU和终端设备通信的角度，描述接入网设备触发的层1/层2切换(接入网设备触发的层3切换可以参照实施)的一种可能的实现流程。
图7为本申请实施例三提供的通信方法所对应的流程示意图，如图7所示，该方法包括：
S701，CU通过第一小区所属的第一DU向终端设备发送至少一个候选小区的配置信 息。
此处，至少一个候选小区可以包括层1/层2切换对应的候选小区。
S702，终端设备对第一小区和至少一个候选小区进行波束级测量，并向第一DU上报波束级测量结果。
S703，第一DU根据波束级测量结果，从至少一个候选小区中选择一个目标小区，比如目标小区为第二小区，并向终端设备发送层1/层2的切换指令，切换指令用于指示终端设备从第一小区切换至第二小区；相应地，终端设备接收切换指令，并根据切换指令从第一小区切换至第二小区。
此处，第一DU根据波束级测量结果选择目标小区的实现可以参照现有技术。
示例性地，层1的切换指令可以为下行控制信息(downlink control information，DCI)，层2的切换指令可以为MAC CE。切换指令中可以包括第二小区的标识信息以及下行波束信息，下行波束信息用于指示第二小区所属的第二DU向终端设备发送下行数据所使用的下行波束。
S704，第一DU向CU发送第三指示信息，第三指示信息用于指示第一DU未向终端设备成功发送的数据包。进一步地，第一DU可以停止向终端设备发送下行数据。
S705，终端设备向第二DU发送切换完成信息，切换完成信息指示终端设备已从第一小区切换至第二小区。
可选地，终端设备还可以向第二DU发送下行波束信息。在一种可能的是实现中，终端设备向第二DU发送的下行波束信息可以为S703中层1/层2的切换指令中所携带的下行波束信息。进而，后续第二DU可以根据下行波束信息，使用相应的下行波束向终端设备发送数据包。
作为一种可能的实现，切换完成信息可以为层1/层2的消息。此种情形下，切换完成信息中可以包括下行波束信息；或者，终端设备也可以额外向第二DU发送下行波束信息。
S706，第二DU向CU发送通知信息，通知信息用于通知CU：终端设备已从第一小区切换至第二小区。
示例性地，通知信息可以包括第一DDDS信息，比如第一DDDS信息可以包括第二DU已经缓存的数据量。
S707，CU根据第三指示信息，通过第二DU向终端设备发送数据包。
采用上述实施例三中的方法，由于第一DU在向终端设备发送切换指令后，可以向CU发送第三指示信息，从而使得CU可以通过目标DU(即第二DU)向终端设备发送这些未成功发送的数据包，有效避免数据包丢失的风险；以及，由于终端设备可以向第二DU发送下行波束信息，从而使得第二DU可以根据下行波束信息，使用相应的波束向终端设备发送下行数据。
针对于上述实施例一至实施例三，可以理解的是：
(1)实施例一至实施例三中是以终端设备的服务小区为一个小区为例进行描述的，在其它可能的情形中，比如当终端设备以双连接方式工作时，实施例一至实施例三中的方案可以适用于双连接中的主基站的切换，或者也可以适用于辅基站(secondary node，SN)/辅小区组(secondary cell group，SCG)添加或辅基站/辅小区组变更。比如，当终端设备确定辅基站/辅小区组中的小区的无线链路满足第一条件后，也可以通过上述实施例一中的 方法恢复该小区的无线链路。
(2)实施例一至实施例三所描述的各个流程图的步骤编号仅为执行流程的一种示例，并不构成对步骤执行的先后顺序的限制，本申请实施例中相互之间没有时序依赖关系的步骤之间没有严格的执行顺序。各个流程图中所示意的步骤并非全部是必须执行的步骤，可以根据实际需要在各个流程图的基础上删除部分步骤，或者也可以根据实际需要在各个流程图的基础上增添其它可能的步骤。
(3)上述侧重描述了实施例一至实施例三中不同实施例之间的差异之处，除差异之处的其它内容，实施例一至实施例三之间可以相互参照；此外，同一实施例中，不同实现方式或不同示例之间也可以相互参照。
上述主要从通信装置交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，为了实现上述功能，终端设备和接入网设备可以包括执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请的实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对终端设备和接入网设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
在采用集成的单元的情况下，图8示出了本申请实施例中所涉及的装置的可能的示例性框图。如图8所示，装置800可以包括：处理单元802和通信单元803。处理单元802用于对装置800的动作进行控制管理。通信单元803用于支持装置800与其他设备的通信。可选地，通信单元803也称为收发单元，可以包括接收单元和/或发送单元，分别用于执行接收和发送操作。装置800还可以包括存储单元801，用于存储装置800的程序代码和/或数据。
该装置800可以为上述实施例中的终端设备。处理单元802可以支持装置800执行上文中各方法示例中终端设备的动作。或者，处理单元802主要执行方法示例中终端设备的内部动作，通信单元803可以支持装置800与其它设备之间的通信。
比如，在一个实施例中，通信单元803用于：在第一小区上接收来自接入网设备的至少一个候选小区的配置信息；处理单元802用于：当所述第一小区的无线链路满足第一条件时，选择第二小区；若所述第二小区属于所述至少一个候选小区，则从所述第一小区切换至所述第二小区，并根据在所述第一小区上接收到的所述第二小区的配置信息，通过通信单元803在所述第二小区上与所述接入网设备进行通信；或者，若所述第二小区不属于所述至少一个候选小区，则执行RRC重建接入所述第二小区。
该装置800可以为上述实施例中的接入网设备。处理单元802可以支持装置800执行上文中各方法示例中接入网设备的动作。或者，处理单元802主要执行方法示例中接入网设备的内部动作，通信单元803可以支持装置800与其它设备之间的通信。
应理解以上装置中单元的划分仅仅是一种逻辑功能的划分，实际实现时可以全部或部 分集成到一个物理实体上，也可以物理上分开。且装置中的单元可以全部以软件通过处理元件调用的形式实现；也可以全部以硬件的形式实现；还可以部分单元以软件通过处理元件调用的形式实现，部分单元以硬件的形式实现。例如，各个单元可以为单独设立的处理元件，也可以集成在装置的某一个芯片中实现，此外，也可以以程序的形式存储于存储器中，由装置的某一个处理元件调用并执行该单元的功能。此外这些单元全部或部分可以集成在一起，也可以独立实现。这里所述的处理元件又可以成为处理器，可以是一种具有信号的处理能力的集成电路。在实现过程中，上述方法的各操作或以上各个单元可以通过处理器元件中的硬件的集成逻辑电路实现或者以软件通过处理元件调用的形式实现。
在一个例子中，以上任一装置中的单元可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个特定集成电路(application specific integrated circuit，ASIC)，或，一个或多个微处理器(digital singnal processor，DSP)，或，一个或者多个现场可编程门阵列(field programmable gate array，FPGA)，或这些集成电路形式中至少两种的组合。再如，当装置中的单元可以通过处理元件调度程序的形式实现时，该处理元件可以是处理器，比如通用中央处理器(central processing unit，CPU)，或其它可以调用程序的处理器。再如，这些单元可以集成在一起，以片上***(system-on-a-chip，SOC)的形式实现。
以上用于接收的单元是一种该装置的接口电路，用于从其它装置接收信号。例如，当该装置以芯片的方式实现时，该接收单元是该芯片用于从其它芯片或装置接收信号的接口电路。以上用于发送的单元是一种该装置的接口电路，用于向其它装置发送信号。例如，当该装置以芯片的方式实现时，该发送单元是该芯片用于向其它芯片或装置发送信号的接口电路。
参见图9，为本申请实施例提供的一种接入网设备的结构示意图，该接入网设备(或基站)可应用于如图1所示的通信***中，执行上述方法实施例中接入网设备的功能。如图9所示，接入网设备90可包括一个或多个DU 901和一个或多个CU 902。所述DU 901可以包括至少一个天线9011，至少一个射频单元9012，至少一个处理器9013和至少一个存储器9014。所述DU 901部分主要用于射频信号的收发以及射频信号与基带信号的转换，以及部分基带处理。CU902可以包括至少一个处理器9022和至少一个存储器9021。
所述CU 902部分主要用于进行基带处理，对接入网设备进行控制等。所述DU 901与CU 902可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。所述CU 902为接入网设备的控制中心，也可以称为处理单元，主要用于完成基带处理功能。例如所述CU 902可以用于控制接入网设备执行上述方法实施例中关于接入网设备的操作流程。
此外，可选的，接入网设备90可以包括一个或多个射频单元，一个或多个DU和一个或多个CU。其中，DU可以包括至少一个处理器9013和至少一个存储器9014，射频单元可以包括至少一个天线9011和至少一个射频单元9012，CU可以包括至少一个处理器9022和至少一个存储器9021。
在一个实例中，所述CU902可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器9021和处理器9022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。所述DU901可以由一个或多个单板构 成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器9014和处理器9013可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图9所示的接入网设备能够实现上述方法实施例中涉及接入网设备的各个过程。图9所示的接入网设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
参见图10，为本申请实施例提供的一种终端设备的结构示意图，该终端设备可应用于如图1所示的通信***中，用于实现以上实施例中终端设备的操作。如图10所示，该终端设备包括：天线1010、射频部分1020、信号处理部分1030。天线1010与射频部分1020连接。在下行方向上，射频部分1020通过天线1010接收网络设备发送的信息，将网络设备发送的信息发送给信号处理部分1030进行处理。在上行方向上，信号处理部分1030对终端设备的信息进行处理，并发送给射频部分1020，射频部分1020对终端设备的信息进行处理后经过天线1010发送给网络设备。
信号处理部分1030可以包括调制解调子***，用于实现对数据各通信协议层的处理；还可以包括中央处理子***，用于实现对终端设备操作***以及应用层的处理；此外，还可以包括其它子***，例如多媒体子***，周边子***等，其中多媒体子***用于实现对终端设备相机，屏幕显示等的控制，周边子***用于实现与其它设备的连接。调制解调子***可以为单独设置的芯片。
调制解调子***可以包括一个或多个处理元件1031，例如，包括一个主控CPU和其它集成电路。此外，该调制解调子***还可以包括存储元件1032和接口电路1033。存储元件1032用于存储数据和程序，但用于执行以上方法中终端设备所执行的方法的程序可能不存储于该存储元件1032中，而是存储于调制解调子***之外的存储器中，使用时调制解调子***加载使用。接口电路1033用于与其它子***通信。
该调制解调子***可以通过芯片实现，该芯片包括至少一个处理元件和接口电路，其中处理元件用于执行以上终端设备执行的任一种方法的各个步骤，接口电路用于与其它装置通信。在一种实现中，终端设备实现以上方法中各个步骤的单元可以通过处理元件调度程序的形式实现，例如用于终端设备的装置包括处理元件和存储元件，处理元件调用存储元件存储的程序，以执行以上方法实施例中终端设备执行的方法。存储元件可以为与处理元件处于同一芯片上的存储元件，即片内存储元件。
在另一种实现中，用于执行以上方法中终端设备所执行的方法的程序可以在与处理元件处于不同芯片上的存储元件，即片外存储元件。此时，处理元件从片外存储元件调用或加载程序于片内存储元件上，以调用并执行以上方法实施例中终端设备执行的方法。
在又一种实现中，终端设备实现以上方法中各个步骤的单元可以是被配置成一个或多个处理元件，这些处理元件设置于调制解调子***上，这里的处理元件可以为集成电路，例如：一个或多个ASIC，或，一个或多个DSP，或，一个或者多个FPGA，或者这些类集成电路的组合。这些集成电路可以集成在一起，构成芯片。
终端设备实现以上方法中各个步骤的单元可以集成在一起，以SOC的形式实现，该SOC芯片，用于实现以上方法。该芯片内可以集成至少一个处理元件和存储元件，由处理元件调用存储元件的存储的程序的形式实现以上终端设备执行的方法；或者，该芯片内可 以集成至少一个集成电路，用于实现以上终端设备执行的方法；或者，可以结合以上实现方式，部分单元的功能通过处理元件调用程序的形式实现，部分单元的功能通过集成电路的形式实现。
可见，以上用于终端设备的装置可以包括至少一个处理元件和接口电路，其中至少一个处理元件用于执行以上方法实施例所提供的任一种终端设备执行的方法。处理元件可以以第一种方式：即调用存储元件存储的程序的方式执行终端设备执行的部分或全部步骤；也可以以第二种方式：即通过处理器元件中的硬件的集成逻辑电路结合指令的方式执行终端设备执行的部分或全部步骤；当然，也可以结合第一种方式和第二种方式执行终端设备执行的部分或全部步骤。
这里的处理元件同以上描述，可以通过处理器实现，处理元件的功能可以和图8中所描述的处理单元的功能相同。示例性地，处理元件可以是通用处理器，例如CPU，还可以是被配置成实施以上方法的一个或多个集成电路，例如：一个或多个ASIC，或，一个或多个微处理器DSP，或，一个或者多个FPGA等，或这些集成电路形式中至少两种的组合。存储元件可以通过存储器实现，存储元件的功能可以和图8中所描述的存储单元的功能相同。存储元件可以是一个存储器，也可以是多个存储器的统称。
图10所示的终端设备能够实现上述方法实施例中涉及终端设备的各个过程。图10所示的终端设备中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详述描述。
本申请实施例中的术语“***”和“网络”可被互换使用。“至少一种”是指一种或者多种，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A、同时存在A和B、单独存在B的情况，其中A，B可以是单数或者复数。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如“A，B和C中的至少一个”包括A，B，C，AB，AC，BC或ABC。以及，除非有特别说明，本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。
本领域内的技术人员应明白，本申请的实施例可提供为方法、***、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方 框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (16)

  1. 一种通信方法，其特征在于，所述方法包括：
    在第一小区上接收来自接入网设备的至少一个候选小区的配置信息；
    当所述第一小区的无线链路满足第一条件时，选择第二小区；
    若所述第二小区属于所述至少一个候选小区，则从所述第一小区切换至所述第二小区，并根据所述第二小区的配置信息在所述第二小区上与所述接入网设备进行通信；或者，若所述第二小区不属于所述至少一个候选小区，则执行无线资源控制RRC重建接入所述第二小区。
  2. 根据权利要求1所述的方法，其特征在于，所述第一小区的无线链路质量满足第一条件，包括以下至少一项：
    所述第一小区的无线链路质量小于第一阈值；
    所述第一小区的无线链路质量在第一时间窗口内均小于所述第一阈值；
    终端设备连续检测到失步指示的次数大于或等于第二阈值；
    所述终端设备连续检测到失步指示的次数大于或等于第二阈值后，启动定时器，在所述定时器的定时窗口内，未检测到同步指示；
    所述第一小区发生无线链路失败RLF。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    在所述第一小区上接收来自所述接入网设备的第一信息，所述第一信息用于配置所述第一条件。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述第二小区的无线链路质量满足第二条件；
    所述第二小区的无线链路质量满足第二条件，包括以下至少一项：
    所述第二小区的无线链路质量大于或等于第三阈值；
    所述第二小区的无线链路质量在第二时间窗口内均大于或等于所述第三阈值；
    所述第二小区的无线链路质量大于或等于所述至少一个候选小区中除所述第二小区之外的其它候选小区的无线链路质量；
    所述第二小区的无线链路质量在所述第二时间窗口内均大于或等于所述至少一个候选小区中除所述第二小区之外的其它候选小区的无线链路质量；
    所述第二小区的无线链路质量大于所述第一小区的无线链路质量；
    所述第二小区的无线链路质量在所述第二时间窗口内均大于所述第一小区的无线链路质量；
    所述第二小区的无线链路质量大于所述第一小区的无线链路质量与偏移量之和；
    所述第二小区的无线链路质量在所述第二时间窗口内始终大于所述第一小区的无线链路质量与偏移量之和。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    在所述第一小区上接收来自所述接入网设备的第二信息，所述第二信息用于配置所述第二条件。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第二小区上向所述接入网设备发送第三信息，所述第三信息用于指示所述终端 设备已从所述第一小区切换至所述第二小区，所述切换为所述终端设备触发的小区切换。
  7. 根据权利要求6所述的方法，其特征在于，所述第三信息包括以下至少一项：
    所述终端设备的标识；
    所述第一小区的标识；
    所述接入网设备在所述第二小区上向所述终端设备发送下行数据所使用的下行波束信息；
    指示信息，所述指示信息指示所述终端设备触发的小区切换。
  8. 根据权利要求6或7所述的方法，其特征在于，所述第三信息承载于所述终端设备在所述第二小区上发起的随机接入过程中的消息。
  9. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第二小区上向所述接入网设备发送第四信息，所述第四信息承载于第一资源，所述第一资源为所述终端设备触发的小区切换所对应的资源。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，所述方法还包括：
    在所述第一小区上接收来自所述接入网设备的使能信息，所述使能信息用于使能所述终端设备在所述终端设备的服务小区的无线链路出现问题后触发小区切换。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，所述至少一个候选小区包括：层1/层2切换对应的候选小区，和/或，层3切换对应的候选小区。
  12. 一种通信装置，其特征在于，包括用于执行如权利要求1至11中任一项所述方法的模块。
  13. 一种通信装置，其特征在于，包括处理器，所述处理器和存储器耦合，所述存储器中存储有计算机程序；所述处理器用于调用所述存储器中的计算机程序，使得所述通信装置执行如权利要求1至11中任一所述的方法。
  14. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1至11中任一项所述的方法。
  15. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被计算机执行时，实现如权利要求1至11中任一项所述方法。
  16. 一种计算机程序产品，其特征在于，当计算机读取并执行所述计算机程序产品时，使得计算机执行权利要求1至11中任一项所述的方法。
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