WO2021027683A1 - 切换方法、通信装置和终端设备 - Google Patents

切换方法、通信装置和终端设备 Download PDF

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Publication number
WO2021027683A1
WO2021027683A1 PCT/CN2020/107410 CN2020107410W WO2021027683A1 WO 2021027683 A1 WO2021027683 A1 WO 2021027683A1 CN 2020107410 W CN2020107410 W CN 2020107410W WO 2021027683 A1 WO2021027683 A1 WO 2021027683A1
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Prior art keywords
configuration information
target cell
cho
cell
terminal device
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PCT/CN2020/107410
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English (en)
French (fr)
Inventor
严乐
耿婷婷
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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
Priority to EP20853132.7A priority Critical patent/EP3996419A4/en
Priority to CN202080046154.8A priority patent/CN114026914A/zh
Publication of WO2021027683A1 publication Critical patent/WO2021027683A1/zh
Priority to US17/667,405 priority patent/US20220167234A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00838—Resource reservation for handover
    • 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
    • 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
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • 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
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • This application relates to the field of communications, and more specifically, to a handover method, communication device, and terminal equipment.
  • the mobility management of the connected terminal device is controlled by the network device, that is, the network device sends a handover message to instruct the terminal device to switch to which cell and how to switch.
  • the traditional handover mechanism may include the source network device (that is, the network device to which the source cell belongs) sending a handover message to the terminal device to control the terminal device to switch from the source cell to the target cell. After receiving the handover message, the terminal device will respond according to the handover message. The information contained in the access target cell. Therefore, the successful transmission of the handover message is a necessary condition to ensure the successful handover under the traditional handover mechanism.
  • LTE long term evolution
  • 5th-generation 5th-generation mobile communication technologies
  • LTE long term evolution
  • 5th-generation 5th-generation mobile communication technologies
  • the channel quality quickly decays, or the terminal
  • the rapid movement of the device and the occlusion of objects, or the long duration of measurement and handover preparation, etc. will cause the failure of the handover message to be sent, which will lead to the handover failure and reduce the handover success rate.
  • the prior art proposes a conditional handover (CHO) mechanism to improve the handover success rate, that is, the source network device sends conditional handover CHO configuration information to the terminal device when the source link quality is good, and the configuration information includes The handover trigger condition configured by the network device for the terminal device and the information of one or more candidate cells corresponding to the handover trigger condition.
  • the terminal device judges whether each candidate cell meets the handover trigger condition according to the configuration information, and uses a candidate cell that meets the handover trigger condition as the target cell to switch to the target cell.
  • the source network device sends the CHO configuration information to the terminal device when the source link communication quality is good, so the success rate of sending the configuration information is guaranteed. Furthermore, the terminal device selects the target cell based on the configuration information. Handover can improve the success rate of handover.
  • the terminal device can perform random access with the target cell after determining the target cell according to the CHO configuration information. After the random access is successful, it can be considered that the terminal device has successfully switched from the current serving cell to the target Community.
  • the terminal device may also receive the CHO configuration information sent by the network device. After the terminal device subsequently receives the CHO configuration information, what should be done? The problem that needs to be solved, the current prior art does not consider how to correctly handle the terminal device in this situation to improve the reliability of conditional switching.
  • the present application provides a switching method, communication device, and terminal equipment, which can improve the reliability of conditional switching and ensure system performance.
  • a handover method including: determining a first target cell according to a first condition for handover CHO configuration information, where the first target cell is a cell to which a terminal device is ready to handover; During the cell process, if the second CHO configuration information is received, it is determined whether to continue handover to the first target cell according to the second CHO configuration information; wherein, the process of trying to access the first target cell , Including: before sending the preamble to the first target cell; and/or, in the process of performing random access RACH with the first target cell.
  • the terminal device determines the first target cell according to the first CHO configuration information. During the terminal device’s attempt to access the first target cell, if the terminal device receives the second CHO configuration information, the terminal device It is necessary to determine whether to continue accessing the previously determined first target cell according to the second CHO configuration information, so that the terminal device can perform correct processing according to the CHO configuration information provided by the network, thereby improving the reliability of conditional switching and ensuring system performance.
  • the network device may configure one or more candidate cells for the terminal device, the first target cell is included in the one or more candidate cells, and the first target cell is a cell that meets the CHO trigger condition among the one or more candidate cells.
  • the first CHO configuration information may include CHO trigger conditions and related information of candidate cells.
  • the CHO trigger condition may include a CHO trigger event type and a corresponding threshold value.
  • the CHO trigger event type includes, for example, event A3, event A4, event A5, event B1, event B2, or other trigger event types.
  • the relevant information of the candidate cell includes at least one of the following information: the cell identity of the candidate cell (for example, the cell global identifier (CGI) and/or the physical cell identifier (PCI)), and the corresponding information of the candidate cell Frequency information (for example, the absolute frequency of the synchronization signal block (synchronization signal block, SSB), the absolute frequency position of the reference resource module, the frequency bandwidth list, the subcarrier spacing (SCS) specific carrier list), the candidate cell is the terminal Cell radio network temporary identifier (C-RNTI) allocated by the device, random access channel (RACH) resource information required to access candidate cells, etc.
  • CGI cell global identifier
  • PCI physical cell identifier
  • Frequency information for example, the absolute frequency of the synchronization signal block (synchronization signal block, SSB), the absolute frequency position of the reference resource module, the frequency bandwidth list, the subcarrier spacing (SCS) specific carrier list
  • the candidate cell is the terminal Cell radio network temporary identifier (C-RNTI) allocated by
  • the related information of the candidate cell may also include resource information corresponding to the candidate cell (for example, physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control, RLC). ) Layer configuration parameters, packet data convergence protocol (PDCP) layer configuration parameters, service data adaptation protocol (service data adaptation protocol, SDAP) layer configuration parameters, radio resource control (radio resource control, RRC) layer Configuration parameters, etc.).
  • resource information corresponding to the candidate cell for example, physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control, RLC).
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • RRC radio resource control
  • the terminal device may determine that the candidate cell meets the CHO trigger condition. If the configured CHO trigger event type is event A5 (also called A5 event), and the configured corresponding thresholds are the second threshold and the third threshold, when the cell signal quality of a candidate cell is higher than the second threshold, And when the cell signal quality of the serving cell is lower than the third threshold, the terminal device can determine that the candidate cell meets the CHO trigger condition.
  • event A3 also called A3 event
  • the configured corresponding threshold is the first threshold (for example, offset (offset) dB)
  • the network device may configure one or more candidate cells for the terminal device, and the first CHO configuration information may include CHO configuration information corresponding to each of the one or more candidate cells.
  • the CHO configuration information corresponding to each candidate cell may include the CHO trigger condition corresponding to the candidate cell and related information corresponding to the candidate cell (for example, the cell identity of the candidate cell, the frequency information corresponding to the candidate cell, and the candidate cell is a terminal device.
  • the CHO trigger conditions corresponding to the one or more candidate cells may be the same or different. In other words, different candidate cells may correspond to the same CHO trigger condition or may correspond to different CHO trigger conditions.
  • the process of attempting to access the first target cell includes: before the terminal device sends a preamble to the first target cell; and/or, after the terminal device sends the preamble to the first target cell, until the terminal device receives random access Before the random access response (RAR); and/or, after the terminal device receives the RAR and before the terminal device sends a radio resource control (radio resource control, RRC) reconfiguration complete message to the first target cell; and/or, After the terminal device sends the preamble to the first target cell, before the terminal device sends the RRC reconfiguration complete message to the first target cell.
  • the process of trying to access the first target cell includes: before the terminal device sends an RRC reconfiguration complete message to the first target cell. It should be understood that the process of trying to access the first target cell can be understood as a process that the terminal device needs to complete in order to switch to the first target cell after determining the first target cell to be switched to.
  • the terminal device determines whether to continue handover to the first target cell according to the second CHO configuration information. It can also be understood that the terminal device determines whether to continue to access the first target cell according to the second CHO configuration information, or the terminal device determines whether to continue to access the first target cell according to the second CHO configuration information.
  • the second CHO configuration information determines whether to continue the random access procedure with the first target cell. After the terminal device determines the first target cell but does not need to perform the random access procedure with the first target cell, the terminal device determines whether to continue handover to the first target cell according to the second CHO configuration information, which can also be understood as The terminal device determines whether to send an RRC reconfiguration complete message to the first target cell according to the second CHO configuration information.
  • the determining whether to continue handover to the first target cell according to the second CHO configuration information includes: determining the first target cell according to the second CHO configuration information A CHO configuration parameter corresponding to a target cell has not changed, and it is determined to continue handover to the first target cell.
  • the terminal device determines that the CHO configuration parameter corresponding to the first target cell has not changed, it can be considered that the first target cell still satisfies the CHO trigger condition, and the first target cell is still suitable for the terminal device to switch to. Therefore, the terminal device can Continue to switch to the first target cell to avoid the terminal device from re-determining the target cell and retrying to access the target cell that meets the CHO trigger condition. This can reduce the complexity, save the energy consumption of the terminal device, and make the terminal device Keep consistent with the understanding/behavior of the network equipment side, improve the reliability of conditional switching, and ensure system performance.
  • the method further includes: according to the second CHO configuration information, or according to the The first CHO configuration information and the second CHO configuration information determine the second target cell to which the terminal device is ready to handover.
  • the terminal device can re-determine the target cell that the terminal device can switch to according to the CHO configuration information configured by the network device, so that the terminal device can switch to the appropriate target cell to ensure service continuous.
  • the second target cell is the cell to which the terminal device and the first target cell are re-determined after the handover procedure fails.
  • the second target cell may be a candidate cell configured by the network device for the terminal device that satisfies CHO A cell that triggers the condition.
  • the second target cell and the first target cell may be the same cell or different cells.
  • the determining whether to continue handover to the first target cell according to the second CHO configuration information includes: determining the first target cell according to the second CHO configuration information When the CHO configuration parameter corresponding to a target cell changes, determine the first CHO configuration information to which the terminal device can be switched according to the second CHO configuration information, or according to the first CHO configuration information and the second CHO configuration information Three target cells.
  • the terminal device determining whether the CHO configuration parameter corresponding to the first target cell has changed includes: determining whether the first target cell is deleted, and/or determining whether the CHO trigger condition corresponding to the first target cell has changed, and /Or, determine whether the related information of the first target cell has changed, where the related information of the first target cell may include the C-RNTI allocated by the first target cell for the terminal device, and the random access required to access the first target cell Channel RACH resources, resource information corresponding to the first target cell (such as physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control (RLC) layer configuration parameters, packet data At least one of the convergence layer protocol (packet data convergence protocol, PDCP) layer configuration parameters, service data adaptation protocol (service data adaptation protocol, SDAP) layer configuration parameters, radio resource control (radio resource control, RRC) layer configuration parameters, etc.) One kind.
  • the convergence layer protocol packet data convergence protocol
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • RRC radio resource control
  • the terminal device determines that the CHO configuration parameter corresponding to the first target cell changes, the first target cell may no longer be a suitable cell for the terminal device to switch to.
  • the terminal device can re-determine the target cell to which the terminal device can switch according to the changed configuration information. Avoid terminal equipment handover to inappropriate cells, or avoid service interruption caused by handover failure between terminal equipment and the first target cell. By re-determining the target cell that can be handed over, the reliability of conditional handover can be improved and the handover success rate can be improved To ensure system performance.
  • the third target cell is a cell re-determined by the terminal device to be handed over when the CHO configuration parameter corresponding to the first target cell changes.
  • the third target cell may be one of the candidate cells configured by the network device for the terminal device.
  • the third target cell and the first target cell may be the same cell or different cells.
  • the second CHO configuration information is CHO full configuration information sent by the network device to the terminal device, and the terminal device may be based on the second CHO configuration information, or may be based on the first CHO configuration information and the The second CHO configuration information determines whether to continue handover to the first target cell.
  • the second CHO configuration information may include indication information, which is used to indicate whether the second CHO configuration information is full configuration information.
  • the indication information may be a binary value, such as "0" indicating the The second CHO configuration information is not full configuration information, "1" indicates that the second CHO configuration information is full configuration information; or, the indication information can be a Boolean value, such as "FALSE” indicates that the second CHO configuration information is not full configuration information , "TRUE” indicates that the second CHO configuration information is full configuration information; or, the indication information has other expressions, which are not limited in the embodiment of the present application.
  • the second CHO configuration information is the CHO full configuration information sent by the network device to the terminal device, it can be understood that the second CHO configuration information and the first CHO configuration information are decoupled from each other and have no association relationship. .
  • the terminal device may determine whether the first target is included in the second CHO configuration information.
  • the cell identifier of the cell such as CGI and/or PCI
  • the index corresponding to the first target cell or the measurement information corresponding to the first target cell (such as measurement frequency or measurement identifier), or other information that can be used to identify the first target cell , To determine whether the configuration parameters corresponding to the first target cell have changed.
  • the terminal device can consider the network device as a terminal device this time
  • the configured candidate cells do not include the first target cell, and it can be considered that the first target cell may no longer be a cell suitable for handover to the terminal device, so the terminal device determines not to continue handover to the first target cell.
  • the terminal device may combine the first CHO configuration information and the second CHO configuration information For judgment, for example, by comparing the first CHO configuration information and the second CHO configuration information, it is judged whether the CHO configuration information (for example, configuration parameters) corresponding to the first target cell has changed.
  • the CHO configuration information for example, configuration parameters
  • the terminal device determines whether the CHO configuration information (for example, configuration parameters) corresponding to the first target cell has changed by comparing the first CHO configuration information and the second CHO configuration information, including: determining whether the first target cell is deleted, and /Or, determine whether the CHO trigger condition corresponding to the first target cell has changed, and/or determine whether the relevant information of the first target cell has changed, wherein the relevant information of the first target cell may include that the first target cell is a terminal device
  • the allocated C-RNTI, the random access channel RACH resource required to access the first target cell, and the resource information corresponding to the first target cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration) Parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.).
  • the terminal device By comparing the first CHO configuration information and the second CHO configuration information, once the terminal device finds that any parameter corresponding to the first target cell has changed, the terminal device determines not to continue to switch to the first target cell, and the terminal device
  • the second CHO configuration information performs subsequent operations, for example, the judgment of whether the CHO trigger condition is satisfied according to the second CHO configuration information, and further, determines the target cell that can be switched to and tries to access.
  • the second CHO configuration information is the CHO full configuration information sent by the network device to the terminal device, and the terminal device determines whether to continue switching to the second CHO configuration information according to the second CHO configuration information.
  • a target cell is the CHO full configuration information sent by the network device to the terminal device, and the terminal device determines whether to continue switching to the second CHO configuration information according to the second CHO configuration information.
  • the terminal device determines not to continue handover to the first target cell, and re-determines the cell to which the terminal device can handover according to the second CHO configuration information.
  • the terminal device uses/ follow the second CHO configuration information. Specifically, after receiving the second CHO configuration information, the terminal device stops switching to the first target cell; the terminal device determines whether the CHO trigger condition is satisfied according to the second CHO configuration information, and then determines the target cell that can be switched to and tries Access.
  • the terminal device determining not to continue handover to the first target cell means that the terminal device does not continue handover to the first target cell this time. In some possible implementations, if the terminal device re-determines that the cell that can be switched to is still the first target cell according to the second CHO configuration information, the terminal device still performs the operation of switching to the first target cell in the new handover procedure .
  • the second CHO configuration information is based on the first CHO configuration information, and is used to determine the candidate cell configured through the first CHO configuration information.
  • Information to be changed this implementation can be referred to as delta configuration.
  • the second CHO configuration information may include indication information, which is used to indicate whether the second CHO configuration information is delta configuration information.
  • the indication information may be a binary value, such as "0" indicating the The second CHO configuration information is delta configuration information, "1" indicates that the second CHO configuration information is not delta configuration information; or, the indication information can be a Boolean value, such as "FALSE” indicating that the second CHO configuration information is not delta configuration information , "TRUE” indicates that the second CHO configuration information is delta configuration information; or, the indication information has other expressions, which is not limited in the embodiment of the present application. It should be understood that, in this implementation manner, there may be an association relationship between the second CHO configuration information and the first CHO configuration information. The terminal device may determine whether to continue handover to the first target cell according to the first CHO configuration information and the second CHO configuration information.
  • the second CHO configuration information is based on the first CHO configuration information, and is used to determine the candidate cell configured through the first CHO configuration information.
  • the terminal device can determine whether the second CHO configuration information includes the cell identity of the first target cell (such as CGI and/or PCI), the index corresponding to the first target cell, and the measurement information corresponding to the first target cell. (For example, measurement frequency point or measurement identifier) or other information used to identify the first target cell to determine whether the configuration parameter corresponding to the first target cell has changed.
  • the terminal device may consider that the network device corresponds to the first target cell. If the CHO configuration information is changed (for example, modified or deleted), the terminal device can determine that the configuration parameter corresponding to the first target cell has changed.
  • the second CHO configuration information is based on the first CHO configuration information, and is used to determine the candidate cell configured through the first CHO configuration information.
  • the terminal device can determine the first CHO configuration information and the second CHO configuration information, for example, by comparing the first CHO configuration information and the second CHO configuration information to determine the CHO configuration corresponding to the first target cell Whether information (such as configuration parameters) has changed.
  • the terminal device determines whether the CHO configuration information (for example, configuration parameters) corresponding to the first target cell has changed by comparing the first CHO configuration information and the second CHO configuration information, including: determining whether the first target cell is deleted, and /Or, determine whether the CHO trigger condition corresponding to the first target cell has changed, and/or determine whether the relevant information of the first target cell has changed, wherein the relevant information of the first target cell may include that the first target cell is a terminal device
  • the allocated C-RNTI, the random access channel RACH resource required to access the first target cell, and the resource information corresponding to the first target cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration) Parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.).
  • the terminal device By comparing the first CHO configuration information and the second CHO configuration information, once the terminal device finds that any parameter corresponding to the first target cell has changed, the terminal device determines not to continue to switch to the first target cell, and the terminal device One CHO configuration information and second CHO configuration information for subsequent operations. For example, the terminal device updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, and can store the updated CHO configuration information. Further, The terminal device determines the target cell according to the updated CHO configuration information and tries to access it.
  • the second CHO configuration information can be used to add new candidate cells, and/or for candidate cells that have been configured (for example, candidate cells that have been configured through the first CHO configuration information).
  • the configuration parameters of the cell are modified, and/or the candidate cell that has been configured (for example, the candidate cell that has been configured through the first CHO configuration information) is deleted.
  • the first CHO configuration information and/or the second CHO configuration information are carried in a radio resource control RRC message.
  • the RRC message may be an existing RRC message such as an RRC reconfiguration message, or a newly defined RRC message.
  • a terminal device which includes a module or unit for performing a one-to-one correspondence of the method/operation/step/action described in the first aspect or any one of the possible implementation manners of the first aspect.
  • the module Or the unit may be a hardware circuit, software, or a hardware circuit combined with software.
  • a communication device which is used to implement the method in the first aspect and any one of its possible implementation manners.
  • the communication device may be the terminal device designed in the above method, or a chip set in the terminal device.
  • the communication device includes a processor, which is coupled with a memory, and can be used to execute instructions in the memory to implement the first aspect and the method in any one of its possible implementation manners.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication interface may be an input/output interface.
  • a communication device in a fourth aspect, includes a transceiver, a processor, and a memory.
  • the processor is used to control the transceiver to send and receive signals
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program from the memory, so that the communication device executes the first aspect or any possible implementation of the first aspect The method in the way.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium.
  • the instructions When the instructions are run on a computer, the computer can execute the first aspect or any one of the first aspects. The method described in the implementation mode.
  • a computer program product containing instructions is provided.
  • the computer program product runs on a computer, the computer executes the method described in the first aspect or any one of the possible implementations of the first aspect.
  • a communication system including a network device and the terminal device described above.
  • Figure 1 is a schematic diagram of an application scenario of an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a handover process of an embodiment of the present application
  • FIG. 3 is a schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a handover method according to another embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Fig. 6 is a schematic structural diagram of a device provided by an embodiment of the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NR new wireless
  • the technical solutions of the embodiments of the present application can be applied to various access technologies when applied in a communication system.
  • it can be applied to orthogonal multiple access (orthogonal multiple access, OMA) technology or non-orthogonal multiple access (non-orthogonal multiple access, NOMA) technology.
  • orthogonal multiple access technology it can be applied to orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) or single carrier frequency division multiple access (single carrier frequency division multiple access, SC-FDMA) and other technologies
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • SCMA sparse code multiple access
  • MUSA multi-user shared access
  • MUSA pattern split multiple access Access
  • PDMA pattern division multiple access
  • IGMA interleave-grid multiple access
  • RSMA resource spreading multiple access
  • NCMA non-orthogonal coded multiple access
  • NOCA non-orthogonal coded access
  • Fig. 1 shows a schematic diagram of an application scenario of an embodiment of the present application.
  • the application scenario may include a network device 110 and a terminal device 120.
  • the network device 110 in the embodiment of the present application may be a device for communicating with the terminal device 120.
  • the network device 110 may be a base station for connecting the terminal device 120 to a radio access network (RAN).
  • RAN radio access network
  • the embodiment of the present application takes the network device 110 as a base station as an example for description.
  • a base station may sometimes be called an access network device or an access network node. It is understandable that in systems using different wireless access technologies, the names of devices with base station functions may be different.
  • the embodiments of the present application provide devices that provide wireless communication access functions for terminal equipment as a base station.
  • the network device 110 may be an evolved node B (eNB or eNodeB) in the long term evolution (LTE), or it may be the downlink in the fifth generation (5G) system of mobile communications.
  • the next generation node base station (gNB) can also be a wireless controller in the cloud radio access network (CRAN) scenario, or it can be a transmission and reception point (TRP), It can also be a centralized unit (CU) or distributed unit (DU) in a 5G system or a future mobile communication system, where the CU and DC can be integrated in the same physical device, or deployed in separate devices in.
  • CU implements some of the functions of gNB
  • DU implements some of the functions of gNB.
  • CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) Layer functions;
  • DU is responsible for processing physical layer protocols and real-time services, and realizes the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer .
  • the network device 110 may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network or a network device in a future evolved PLMN network, etc., which is not limited in the embodiment of the present application.
  • the network device 110 may be a macro base station or a micro base station.
  • the coverage area of the network device 110 may include one cell or multiple cells.
  • the terminal device 120 in the embodiment of the present application may communicate with one or more core networks (core networks, CN) via an access network device.
  • the terminal device 120 can be a device with wireless transceiver function.
  • the terminal device 120 can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water (such as a ship); it can also be deployed In the air (for example, on airplanes, balloons, satellites, etc.).
  • the terminal device 120 may also be referred to as user equipment (UE), access terminal, terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless network equipment, User agent or user device.
  • UE user equipment
  • the terminal device 120 may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a smart phone, a wireless local loop (wireless local loop, WLL) station, a personal digital processing ( personal digital assistant, PDA), handheld devices with wireless communication capabilities, computing devices or other devices connected to wireless modems, in-vehicle devices, wearable devices, drone devices or the Internet of Things, terminals in the Internet of Vehicles, and future networks Any form of terminal, relay user equipment, or terminal in the future evolved public land mobile network (PLMN).
  • PLMN public land mobile network
  • the embodiment of the application does not limit this.
  • the terminal device 120 is the UE as an example for description.
  • the network device 110 and the terminal device 120 can transmit uplink and downlink signals through the transmission link (or communication link) between the two.
  • the transmission link from the network device 110 to the terminal device 120 can be called the downlink. (downlink), the transmission link from the terminal device 120 to the network device 110 may be called an uplink (uplink).
  • the original serving cell can no longer provide service to the terminal device or the service quality provided to the terminal device is poor. In order not to interrupt the service, the terminal device needs to be Switch to a more suitable cell, continue to provide services for terminal equipment, and realize mobility management.
  • the original serving cell may be referred to as the source cell, and the cell that provides continuous service for the terminal device may be referred to as the target cell.
  • the process of the terminal device switching from the source cell to the target cell is handover.
  • the source cell and the target cell may be located in the coverage area of the same network device, or may be located in the coverage area of different network devices.
  • the source cell and the target cell may belong to the same base station or different base stations.
  • the base station to which the source cell belongs may be referred to as the source base station.
  • the source cell belongs to The network device in may be called the source network device, and the base station to which the target cell belongs may be called the target base station. Accordingly, the network device to which the target cell belongs may be called the target network device.
  • the source base station and the target base station are the same.
  • the terminal equipment is handed over between different cells in the same base station, which may also be referred to as intra-site handover in some embodiments.
  • the process of the terminal device handing over from the source cell to the target cell can be considered as a handover between different base stations, which can also be referred to as an inter-station handover in some embodiments.
  • the mobility management of the connected terminal equipment is usually controlled by the network equipment, that is, the network equipment sends a handover message to instruct the terminal equipment to switch to which cell and how to switch.
  • the terminal device 120 is within the coverage of the source cell managed by the network device 110.
  • the network device 110 may send a handover message to the terminal device 120 to control the terminal device 120 from the source cell. Switch to the target cell.
  • the handover message sent by the network device 110 to the terminal device 120 may be a radio resource control (Radio Resource Control, RRC) message.
  • RRC Radio Resource Control
  • the RRC message may be an RRC reconfiguration message carrying a reconfiguration with sync (reconfiguration with sync); in an LTE system, the RRC message (ie, handover message) may be It is an RRC connection reconfiguration message that carries a mobility control information element (mobility control info).
  • the handover message sent by the network device 110 to the terminal device 120 includes related information of the target cell and related configuration parameters required for the terminal device 120 to access the target cell.
  • the handover message may include relevant information of the target cell, such as the physical cell identifier (PCI) of the target cell and the frequency information corresponding to the target cell.
  • PCI physical cell identifier
  • the target cell allocates the cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI), random access channel (RACH) resource information required for terminal equipment to access the target cell, where RACH resource information may include dedicated RACH resource information and/or public RACH resource Information, and other related information.
  • RACH resource information may include dedicated RACH resource information and/or public RACH resource Information, and other related information.
  • the frequency information corresponding to the target cell may include the frequency point corresponding to the target cell.
  • the content of the frequency information corresponding to the target cell may refer to the specific description in the protocol TS38331-f51, which will not be repeated here. Repeat.
  • the terminal device 120 After receiving the handover message sent by the network device 110, the terminal device 120 can access the target cell according to the information contained in the handover message.
  • the successful transmission of the handover message is a necessary condition to ensure the successful handover of the terminal equipment under the traditional handover mechanism.
  • the rapid attenuation of channel quality, the rapid movement of terminal equipment, the obstruction of objects, or the long duration of measurement and handover preparation will cause the handover message to fail to be sent.
  • the wireless link fails or the handover fails, which reduces the handover success rate.
  • a conditional handover (CHO) mechanism can be used to improve the handover success rate.
  • the CHO mechanism is a handover based on the CHO trigger condition (or CHO execution condition).
  • the network device can notify the terminal device of the configuration information of one or more candidate cells and the corresponding CHO trigger condition when the communication link quality is good.
  • the candidate cell that meets the CHO trigger condition can be used as the target cell, and the terminal device can switch from the source cell to the determined target cell after determining the target cell, without the need for the network device to send the handover as in the traditional handover mechanism Message to notify the terminal device to switch to the cell.
  • the network device can configure a candidate cell or multiple candidate cells for the terminal device.
  • the candidate cell and the source cell can belong to the same base station or different base stations; when the network device is configured for the terminal device
  • the multiple candidate cells and the source cell may belong to the same base station or different base stations, and the multiple candidate cells may also belong to the same base station or different base stations.
  • the base station to which the candidate cell belongs may be referred to as a candidate base station, and accordingly, the network device to which the candidate cell belongs may be referred to as a candidate network device.
  • the following describes the switching process of the terminal device based on the CHO mechanism in conjunction with FIG. 2.
  • the CHO process shown in FIG. 2 is only exemplary, and some steps may not be executed, or there are other steps that are executed in the CHO process but are not shown in FIG. 2.
  • the logical sequence between the steps can be adjusted, which is not specifically limited in the embodiment of the present application.
  • step S210 the source network device sends CHO configuration information to the terminal device.
  • the source network device may send CHO configuration information to the terminal device when the source link quality is good.
  • the source link is the communication link between the source network device and the terminal device, including an uplink and a downlink.
  • the CHO configuration information may include CHO trigger conditions (or CHO execution conditions), information of one or more candidate cells, etc., where the CHO trigger conditions of multiple candidate cells may be the same or different.
  • the information of the candidate cell may include at least one of the following information: the cell global identifier (CGI) of the candidate cell, the physical cell identifier (PCI) of the candidate cell, the frequency information corresponding to the candidate cell, the candidate cell The C-RNTI allocated by the cell to the terminal equipment, the random access channel RACH resource information required to access the candidate cell, etc.
  • CGI cell global identifier
  • PCI physical cell identifier
  • the frequency information corresponding to the candidate cell may include the absolute frequency (such as absolute frequency SSB) of the synchronization signal block (synchronization signal block, SSB), and the absolute frequency position (for example, the common resource block, common RB0) of the reference resource block (SSB).
  • absolute frequency point e.g. absolute frequency pointA
  • frequency band list frequency band list
  • SCS subcarrier spacing
  • the random access channel RACH resource information required to access the candidate cell may include dedicated RACH resource information and/or public RACH resource information.
  • the information of the candidate cell may also include resource information corresponding to the candidate cell (such as physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control (RLC) layer Configuration parameters, Packet Data Convergence Protocol (PDCP) layer configuration parameters, Service Data Adaptation Protocol (SDAP) layer configuration parameters, Radio Resource Control (radio resource control, RRC) layer configuration parameters Wait).
  • resource information corresponding to the candidate cell such as physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control (RLC) layer Configuration parameters, Packet Data Convergence Protocol (PDCP) layer configuration parameters, Service Data Adaptation Protocol (SDAP) layer configuration parameters, Radio Resource Control (radio resource control, RRC) layer configuration parameters Wait).
  • resource information corresponding to the candidate cell such as physical layer configuration parameters, media access control (MAC) layer configuration parameters, radio link control (RLC) layer Configuration parameters, Packet Data Convergence Protocol (PDCP) layer configuration parameters, Service Data Adaptation Protocol (SDAP) layer configuration parameters, Radio Resource
  • the network device when the network device configures multiple candidate cells for the terminal device, for each candidate cell in the multiple candidate cells, the network device can configure the terminal device with the CHO configuration information corresponding to each candidate cell.
  • the CHO configuration information sent by the source network device to the terminal device includes CHO configuration information corresponding to each of the multiple candidate cells.
  • the CHO configuration information corresponding to each candidate cell may include the CHO trigger condition (or CHO execution condition) corresponding to the candidate cell and the information of the candidate cell, and the information of the candidate cell may include at least one of the following information: the candidate cell The CGI, PCI, the frequency information corresponding to the candidate cell, the C-RNTI allocated by the candidate cell to the terminal device, the RACH resource information required to access the candidate cell, and the resource information corresponding to the candidate cell (such as physical layer configuration parameters) , MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.).
  • the CHO trigger conditions corresponding to each candidate cell may be the same or different. The embodiments of this application do not limit this.
  • the network equipment can configure a common CHO trigger condition for multiple candidate cells without configuring corresponding CHO trigger conditions for each candidate cell.
  • CHO trigger condition For example, when the CHO trigger conditions corresponding to multiple candidate cells configured by the network device for the terminal device are the same, the CHO configuration information sent by the network device to the terminal device may include the information of multiple candidate cells and a common CHO trigger condition. After the terminal device receives the CHO configuration information sent by the network device, it determines multiple candidate cells included in the CHO configuration information, and shares a CHO trigger condition included in the CHO configuration information, that is, multiple candidate cells included in the CHO configuration information. The candidate cells all correspond to a CHO trigger condition included in the CHO configuration.
  • the CHO configuration information in S210 may be included in the RRC message or other messages, which is not limited in this embodiment of the application.
  • step S220 after the terminal device receives the CHO configuration information, the terminal device can determine whether the CHO trigger condition (or the CHO execution condition) is satisfied according to the CHO configuration information, and determine the target cell.
  • the terminal device can determine whether the configured candidate cell satisfies the CHO trigger condition according to the CHO configuration information, so as to use a certain candidate cell that satisfies the CHO trigger condition as the target cell. If there are multiple candidate cells that meet the CHO trigger condition, the terminal device can select a cell from the multiple candidate cells that meet the CHO trigger condition as the target cell according to a certain rule, for example, multiple candidate cells that meet the CHO trigger condition. The cell with the highest signal quality in the cells is determined as the target cell, or the cell with the highest priority (such as the highest frequency priority) among multiple candidate cells that meet the CHO trigger condition is determined as the target cell, or the cell that meets the CHO trigger The multiple candidate cells under the conditions have the most excellent beams (excellent beams means that the signal quality of the beam is higher than a predetermined threshold.
  • the predetermined threshold may be included in the first message or agreed upon by agreement.
  • This application (Not limited) is determined as the target cell, or any one of multiple candidate cells meeting the CHO trigger condition is determined as the target cell, or the target cell is determined by other means, or is left to the terminal device to achieve this application The embodiment does not limit this.
  • the terminal device determines whether the CHO trigger condition is satisfied, it may be based on the cell signal quality measured by radio resource management (RRM) (for example, reference signal received power (RSRP) and/or Refer to the signal received quality (reference signal received quality, RSRQ) for judgment.
  • RRM radio resource management
  • the candidate cell configured by the network device for the terminal device includes candidate cell #1, corresponding to candidate cell #1, the CHO trigger event type configured by the network device is the A3 event, and the configured corresponding threshold value is the compensation value ( offset), when the cell signal quality of candidate cell #1 is higher than the cell signal quality of the serving cell (i.e.
  • the candidate cell #1 is considered to meet the CHO trigger condition, and the terminal device can select the candidate cell #1 Determined as the target cell, that is, the terminal device can switch from the serving cell to the candidate cell #1.
  • the candidate cell configured by the network device for the terminal device also includes candidate cell #2, which corresponds to candidate cell #2.
  • the CHO trigger event type configured by the network device is the A5 event and the corresponding gate is configured.
  • the limit is J and K.
  • candidate cell #2 is considered to meet the CHO trigger condition, and the terminal equipment
  • the candidate cell #2 can be determined as the target cell, that is, the terminal device can be handed over from the serving cell to the candidate cell #2.
  • the CHO trigger event type configured by the network device for the candidate cell can be determined according to actual needs.
  • the candidate cell satisfies the CHO trigger condition corresponding to the CHO trigger event type, that is, it is considered that the candidate cell can be determined as the target cell.
  • the terminal device may perform a random access RACH process with the determined target cell.
  • the target cell and the source cell belong to different network devices, and after this step 220, the terminal device will perform the RACH process with the network device to which the target cell belongs, that is, the target network device (for example, candidate network device #1 in FIG. 2). If both the target cell and the source cell belong to the same network device, the terminal device may not need to perform the RACH process with the target cell (or the target network device, that is, the source network device).
  • the terminal device can send a message indicating the completion of CHO to the target network device to which the target cell belongs, such as an RRC message.
  • the exemplary RRC message may be an RRC reconfiguration complete message to notify the target network device of the conditions The handover is complete, and the terminal device has successfully switched to the target cell.
  • the target network device is the source network device, and the terminal device notifies the source network device that the condition switching is complete.
  • the UE has successfully handed over from the source cell to the target cell.
  • the source network device sends the configuration information for conditional switching (ie CHO configuration information) to the terminal device when the source link communication quality is good, ensuring the success rate of sending the CHO configuration information, and the terminal device according to The CHO configuration information selects the target cell and performs handover, which improves the success rate of handover.
  • the source network device and the terminal device can perform a measurement process, such as step S201 and step S202 shown in FIG. 2.
  • step S201 the source network device sends the measurement configuration to the terminal device in an RRC reconfiguration message.
  • step S202 the terminal device measures the measurement object after receiving the measurement configuration, and when it is evaluated that the measurement result meets the reporting trigger condition, the terminal device sends a corresponding measurement report to the source network device.
  • the source network device performs the CHO handover preparation process according to the measurement report reported by the terminal device. For example, after the source network device determines the candidate cell according to the measurement report, the source network device prepares for handover with the candidate network device to which the candidate cell belongs.
  • the source network device and the candidate network device perform signaling interaction.
  • the candidate cells determined by the source network device include candidate cell #1 and candidate cell #2, candidate cell #1 belongs to candidate network device #1, and candidate cell #2 belongs to candidate network device #2 .
  • the source network device sends a request message to candidate network device #1 and candidate network device #2, respectively, for requesting candidate network device #1 and candidate network device #2 to prepare for conditional switching. It may be a handover request message or other messages, which is not limited in the embodiment of the present application.
  • candidate network device #1 and candidate network device #2 respectively send a request confirmation message to the source network device.
  • the request confirmation message may be a handover request confirmation message or other messages, which are not limited in the embodiment of the application .
  • the request confirmation message may contain candidate cell information.
  • the request confirmation message in S204a may contain candidate cell #1 information
  • the request confirmation message in S204b may contain candidate cell #2 information, specifically, candidate cell information.
  • candidate cell #2 information specifically, candidate cell information.
  • the source network device may perform signaling with multiple candidate network devices.
  • each candidate network device may also include multiple candidate cells; or, the source network device may perform multiple signaling interactions with the same candidate network device.
  • the source network device can prepare the candidate cell for handover (e.g., admission control, resource allocation), that is, the handover preparation process for conditional handover may not be performed (e.g., handover request ,
  • the handover request confirmation can be omitted).
  • the source network device may perform handover preparation for conditional handover with one or more candidate cells
  • the CHO configuration information sent by the source network device to the terminal device may include CHO configuration information corresponding to the one or more candidate cells.
  • the CHO configuration information corresponding to the one or more candidate cells may change.
  • the source network device can maintain the radio resource control RRC connection and data transmission with the terminal device until the terminal device successfully switches to a certain A cell.
  • the network device (such as the source network device or the target network device) can send the full CHO configuration information to replace the previously sent CHO configuration information.
  • the network device can reconfigure candidate cells for the terminal device; or, the network device previously sent Based on the CHO configuration information, add, modify or delete the configured candidate cells.
  • the network device can configure a new candidate cell for the terminal device, delete a previously configured candidate cell, and modify the configured candidate cell correspondence CHO configuration information, etc.
  • the network device can provide the terminal device with the CHO configuration information corresponding to the new candidate cell, can modify the CHO configuration information corresponding to the configured candidate cell, can delete the CHO configuration information corresponding to the configured candidate cell, or provide The terminal device sends the CHO configuration information corresponding to the reconfigured candidate cell, etc.
  • the source network device decides to configure a new candidate cell, or delete a previously configured candidate cell, or modify the CHO configuration information corresponding to the configured candidate cell, or reconfigure the candidate cell for the terminal device , That is, the change of CHO configuration information is triggered by the source network device; or, in another implementation, the candidate network device decides to configure a new candidate cell, or delete a previously configured candidate cell, or modify the configured candidate
  • the CHO configuration information corresponding to the cell or the reconfiguration of the candidate cell for the terminal device that is, the change of the CHO configuration information is triggered by the candidate network device.
  • the candidate network device notifies the source network device of the changed CHO configuration information, and then the source network device Send the changed CHO configuration information to the terminal device.
  • the source network device can provide the changed CHO configuration information to the terminal device, that is, the source network device can execute step S210 in FIG. 2 multiple times.
  • the terminal device determines the target cell according to the CHO configuration information sent by the network device (such as the first CHO configuration information), it can perform a random access process with the network device to which the target cell belongs. After the random access is successful, it can It is considered that the terminal device has been successfully handed over from the source cell to the target cell.
  • the terminal device may also receive the subsequent CHO configuration sent by the network device while the terminal device attempts to access the target cell.
  • the second CHO configuration information subsequently received by the terminal device may have changed the first CHO configuration information (for example, addition, modification, deletion or complete replacement), which is currently not available in the prior art Consider how the terminal device handles this situation.
  • the embodiments of this application provide a method that can solve the problem of how the terminal device can process the CHO configuration information when it is trying to access the target cell when it receives the CHO configuration information so as to improve the reliability of the CHO and ensure the system performance. .
  • the embodiments of the present application will be described in detail below in conjunction with FIG. 3.
  • Fig. 3 shows a schematic flowchart of a handover method according to an embodiment of the present application.
  • the method 300 in FIG. 3 may be executed by a terminal device.
  • the terminal device may be, for example, the terminal device 120 shown in FIG. 1 or the terminal device shown in FIG. 2.
  • the method 300 may include step S310 to step S320.
  • step S310 switch the CHO configuration information according to the first condition to determine the first target cell.
  • the first target cell is a cell to which the terminal device is ready to handover.
  • the network device may configure one or more candidate cells for the terminal device, the first target cell is included in the one or more candidate cells, and the first target cell is a cell that meets the CHO trigger condition among the one or more candidate cells.
  • the first CHO configuration information may include CHO trigger conditions and related information of candidate cells.
  • the CHO trigger condition may include a CHO trigger event type and a corresponding threshold.
  • the CHO trigger event type may include, for example, event A3, event A4, event A5, event B1, event B2, or other trigger event types.
  • the related information of the candidate cell may include at least one of the following information: the cell identity of the candidate cell (such as CGI and/or PCI), the frequency information corresponding to the candidate cell (such as the absolute frequency of the synchronization signal block SSB, the absolute frequency of the reference resource module). Frequency location, frequency bandwidth list, SCS specific carrier list), C-RNTI allocated by the candidate cell to the terminal device, random access channel RACH resource information required to access the candidate cell, etc.
  • the related information of the candidate cell may also include resource information corresponding to the candidate cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.) ).
  • resource information corresponding to the candidate cell such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.
  • the terminal device may determine that the candidate cell meets the CHO trigger condition. If the configured CHO trigger event type is event A5 (also called A5 event), and the configured corresponding thresholds are the second threshold and the third threshold, when the cell signal quality of a candidate cell is higher than the second threshold, And when the cell signal quality of the serving cell is lower than the third threshold, the terminal device can determine that the candidate cell meets the CHO trigger condition.
  • event A3 also called A3 event
  • the configured corresponding threshold is the first threshold (for example, offset (offset) dB)
  • trigger event type is only exemplary. In some embodiments, other definition methods may also be used to define whether the CHO trigger event type and the CHO trigger condition are satisfied, which is not limited in the embodiment of the application. .
  • the network device may configure one or more candidate cells for the terminal device, and the first CHO configuration information may include CHO configuration information corresponding to each of the one or more candidate cells.
  • the CHO configuration information corresponding to each candidate cell may include the CHO trigger condition corresponding to the candidate cell and related information corresponding to the candidate cell (for example, the cell identity of the candidate cell, the frequency information corresponding to the candidate cell, and the candidate cell is a terminal device.
  • the related information of the candidate cell may also include resource information corresponding to the candidate cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration) Parameters, etc.).
  • resource information corresponding to the candidate cell such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration
  • the CHO trigger conditions corresponding to the one or more candidate cells may be the same or different. That is to say, different candidate cells may correspond to the same CHO trigger condition, or they may correspond to different CHO trigger conditions. Make specific restrictions.
  • the first CHO configuration information may be included in the RRC message or other messages, which is not limited in the embodiment of the present application.
  • the first target cell and the serving cell where the terminal device is currently located may belong to the same network device or different network devices.
  • the first target cell and the serving cell (ie, the source cell) where the terminal device is currently located may belong to the same base station or different base stations.
  • step S320 in the process of trying to access the first target cell, if the second CHO configuration information is received, it is determined whether to continue handover to the first target cell according to the second CHO configuration information.
  • the process of attempting to access the first target cell may include before sending a preamble to the first target cell, and/or during a random access RACH process with the first target cell.
  • the process of trying to access the first target cell may include: before the terminal device sends the preamble to the first target cell; and/or, before the terminal device sends the preamble to the first target cell After the cell sends the preamble and before the terminal device receives a random access response (RAR); and/or after the terminal device receives the RAR to before the terminal device sends an RRC reconfiguration complete message to the first target cell; and/ Or, after the terminal device sends the preamble to the first target cell to before the terminal device sends the RRC reconfiguration complete message to the first target cell.
  • RAR random access response
  • the process of trying to access the first target cell includes: before the terminal device sends an RRC reconfiguration complete message to the first target cell.
  • the process of trying to access the first target cell can be understood as a process that the terminal device needs to complete in order to switch to the first target cell after determining the first target cell to be switched to.
  • the process of attempting to access the first target cell includes that before the terminal device sends the preamble to the first target cell, it can be understood that the terminal device has determined the first target cell according to the first CHO configuration information, and is preparing to send to the first target cell.
  • the process of sending the preamble belongs to the process of the terminal device trying to access the first target cell.
  • the terminal device determines the first target cell according to the first CHO configuration information. During the terminal device’s attempt to access the first target cell, if the terminal device receives the second CHO configuration information, the terminal device The second CHO configuration information can determine whether to continue to access the determined first target cell, so that the terminal device can perform correct processing according to the CHO configuration information provided by the network device, thereby improving the reliability of conditional switching and ensuring system performance .
  • the second CHO configuration information may be based on the first CHO configuration information, information used to change candidate cells configured through the first CHO configuration information (this method may be called delta configuration the way). For example, based on the first CHO configuration information, the second CHO configuration information can be used to add new candidate cells, and/or for candidate cells that have been configured (for example, candidate cells that have been configured through the first CHO configuration information). The configuration parameters of the cell) are modified, and/or the candidate cell that has been configured (for example, the candidate cell that has been configured through the first CHO configuration information) is deleted.
  • the second CHO configuration information is used to add a new candidate cell (for example, the second CHO configuration information includes the CHO trigger condition corresponding to the newly added candidate cell and/or related information of the newly added candidate cell, etc.), or,
  • the second CHO configuration information can be used to modify the configuration information of the candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information) (for example, it may include the corresponding CHO trigger condition after the candidate cell is modified) And/or the corresponding related information after the candidate cell is modified, etc.), or the second CHO configuration information can also be used to delete the candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information) (For example, including deleting the CHO trigger condition corresponding to the candidate cell that has been configured, and/or deleting the related information of the candidate cell that has been configured, and/or deleting the measurement identification and measurement corresponding to the candidate cell that have been configured Frequency, etc.).
  • the relevant information of the candidate cell refer to the
  • the terminal device can change the configuration parameters according to the received second CHO configuration and first CHO configuration information. For example, based on the first CHO configuration information, if the second CHO configuration information is used to add a new candidate cell, the terminal device adds a new candidate cell, including adding the CHO trigger condition and/or corresponding to the new candidate cell.
  • the terminal device can modify the trigger condition corresponding to the configured candidate cell and/or the related information of the configured candidate cell to the corresponding CHO trigger condition after modification of the configured candidate cell and/or the corresponding related information after modification ; If the second CHO configuration information is used to delete the candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information), the terminal device can delete the CHO corresponding to the candidate cell that has been configured Trigger condition, and/or delete the relevant information of the candidate cell that has been configured, and/or delete the measurement identifier, measurement frequency point, etc., corresponding to the candidate cell that has been configured, that is, the terminal device deletes the candidate cell and no longer corrects The candidate cell determines whether the CHO trigger condition is satisfied. Furthermore, the terminal device will not switch to the candidate cell.
  • the second CHO configuration information is based on the first CHO configuration information, and is used to change the candidate cell configured through the first CHO configuration information. It can also be expressed as that the second CHO configuration information is the first CHO configuration information.
  • the second CHO configuration information may be CHO full configuration information sent by the network device to the terminal device. That is, the second CHO configuration information and the first CHO configuration information are independent and decoupled from each other, and have no association relationship.
  • the terminal device can completely replace the previously received first CHO configuration information with the received second CHO configuration information, and can execute the conditional switching process according to the second CHO configuration information; or the terminal device can be configured according to the second CHO configuration information Information and the first CHO configuration information perform a conditional switching process.
  • the candidate cell configured for the terminal device by the network device indicated in the second CHO configuration information and the candidate cell configured for the terminal device by the network device indicated in the first CHO configuration information may be completely the same, partially the same, or completely different.
  • the candidate cells configured by the network device for the terminal device indicated in the second CHO configuration information may include the first target cell, or may not include the first target cell, which is not specifically limited in the embodiment of the present application.
  • the second CHO configuration information may be included in the RRC message or other messages, which is not limited in the embodiment of the present application.
  • the RRC message containing the second CHO configuration information may include indication information (such as the first indication information) for indicating whether the second CHO configuration information is full configuration information, and/or include indication information for indicating the Whether the second CHO configuration information is indication information of delta configuration information (such as second indication information).
  • the first indication information may be a binary value.
  • “0” indicates that the second CHO configuration information is not full configuration information
  • "1" indicates that the second CHO configuration information is full configuration information
  • the indication information may be A Boolean value, such as "FALSE” indicates that the second CHO configuration information is not full configuration information, and "TRUE” indicates that the second CHO configuration information is full configuration information; or, the first indication information has other ways of expressing it, this embodiment of the application There is no restriction on this.
  • the second indication information may be a binary value.
  • the indication information may be A Boolean value, such as "FALSE” indicates that the second CHO configuration information is not delta configuration information, and "TRUE” indicates that the second CHO configuration information is delta configuration information; or, the second indication information has other ways of representing it, this embodiment of the application There is no restriction on this.
  • the terminal device determines whether to continue handover to the first target cell according to the second CHO configuration information. It can also be understood that the terminal device determines whether to continue to access the first target cell according to the second CHO configuration information. Cell, or determine whether to continue the random access procedure with the first target cell. After the terminal device determines the first target cell but does not need to perform the random access procedure with the first target cell, the terminal device determines whether to continue handover to the first target cell according to the second CHO configuration information, which can also be understood as The terminal device determines whether to send an RRC reconfiguration complete message to the first target cell according to the second CHO configuration information.
  • the terminal device determines whether to continue handover to the first target cell according to the second CHO configuration information.
  • the terminal device can determine whether to continue handover to the first target cell according to the first CHO configuration information and the second CHO configuration information. For example, if the terminal device determines that the first target cell has not changed according to the first CHO configuration information and the second CHO configuration information, specifically, for example, the CHO configuration parameter corresponding to the first target cell has not changed, the terminal device determines to continue the handover To the first target cell.
  • the terminal device determines that the first target cell has changed according to the first CHO configuration information and the second CHO configuration information, specifically, for example, if the CHO configuration parameter corresponding to the first target cell changes, the terminal device changes according to the first CHO configuration information and The second CHO configuration information determines the third target cell to which the terminal device is ready to handover.
  • the terminal device determines that the first target cell has changed according to the first CHO configuration information and the second CHO configuration information, for example, if it determines that the CHO configuration parameter corresponding to the first target cell has changed, the terminal device determines not to continue handover To the first target cell or stop handover to the first target cell or stop the random access procedure with the first target cell.
  • the terminal device can select a cell that meets the CHO configuration information, that is, the third target cell, according to the latest CHO configuration information, to try to access.
  • the terminal device combines the first CHO configuration information and the second CHO configuration information to determine the latest CHO configuration information.
  • the CHO configuration parameter corresponding to the first target cell may include at least one of the following: a CHO trigger condition corresponding to the first target cell, the C-RNTI allocated by the first target cell for the terminal device, and the location where the first target cell is accessed.
  • Required random access channel RACH resources, resource information corresponding to the first target cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.) Wait.
  • the terminal device determines that the CHO configuration parameter corresponding to the first target cell has not changed, it can be considered that the first target cell still satisfies the CHO trigger condition, and the first target cell is still a target cell suitable for handover by the terminal device. Therefore, The terminal device can continue to switch to the first target cell, avoiding the process of the terminal device re-determining the target cell, retrying to access the target cell that meets the CHO trigger condition, etc., thereby reducing complexity and saving energy consumption of the terminal device. When the terminal device determines that the CHO configuration parameter corresponding to the first target cell changes, the first target cell may no longer be a suitable cell for the terminal device to switch to.
  • the terminal device can re-determine the target that can be switched to according to the latest configuration information after the change.
  • Cell avoid terminal equipment handover to inappropriate cell, or avoid service interruption caused by handover failure between terminal equipment and the first target cell, by re-determining the target cell that can be handed over, thereby improving the reliability of conditional handover and improving handover
  • the success rate guarantees system performance.
  • the terminal device may determine whether the CHO configuration parameter corresponding to the first target cell has changed in many ways according to the first CHO configuration information and the second CHO configuration information.
  • the terminal device determining whether the CHO configuration parameter corresponding to the first target cell has changed may include: determining whether the first target cell is deleted, and/or whether the CHO trigger condition corresponding to the first target cell has changed, and/or, Relevant information of a target cell (for example, the C-RNTI allocated by the first target cell to the terminal device, and/or the random access channel RACH resource required to access the first target cell, and/or the first target cell Whether the corresponding resource information (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.) has changed.
  • a target cell for example, the C-RNTI allocated by the first target cell to the terminal device, and/or the random access channel RACH resource required to access the first target cell, and/or the first target cell Whether the corresponding resource information (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer
  • the terminal device may according to whether the second CHO configuration information includes the cell identity of the first target cell (for example, CGI and/or PCI), the index corresponding to the first target cell (for example, the first CHO configuration information includes the first target cell).
  • the index corresponding to the target cell the measurement information corresponding to the first target cell (for example, measurement frequency or measurement identifier), or other information that can be used to identify the first target cell, to determine whether the configuration parameters of the first target cell have changed.
  • the terminal device can determine the first CHO configuration information and the second CHO configuration information, for example, by comparing the first CHO configuration information and the second CHO configuration information to determine the CHO configuration information corresponding to the first target cell ( For example, whether configuration parameters have changed.
  • the terminal device determines whether the CHO configuration information (for example, configuration parameters) corresponding to the first target cell has changed by comparing the first CHO configuration information and the second CHO configuration information, including: determining whether the first target cell is deleted, and /Or, determine whether the CHO trigger condition corresponding to the first target cell has changed, and/or determine whether the relevant information of the first target cell has changed, wherein the relevant information of the first target cell is referred to the above description and will not be repeated.
  • the terminal device By comparing the first CHO configuration information and the second CHO configuration information, once the terminal device finds that any parameter corresponding to the first target cell has changed, the terminal device determines not to continue to switch to the first target cell, and the terminal device One CHO configuration information and second CHO configuration information for subsequent operations. For example, the terminal device updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, and can store the updated CHO configuration information. Further, The terminal device determines the target cell according to the updated CHO configuration information and tries to access it.
  • the terminal device can determine that the configuration parameters of the first target cell have not changed, and accordingly, the terminal device can determine to continue handing over to the first target cell.
  • the second CHO configuration information does not include the information used to add/modify/delete the first target cell or the configuration parameters corresponding to the first target cell, and the terminal device can consider that the first target cell is still suitable for the terminal device The cell to be switched to, so the terminal device can continue to switch to the first target cell.
  • the terminal device can determine that the configuration parameters of the first target cell have changed, and accordingly, the terminal device can determine that it will not continue to switch to the first target cell .
  • the second CHO configuration information includes information used to add/modify/delete the first target cell or the configuration parameters corresponding to the first target cell, and the terminal device may think that the first target cell may no longer be suitable for the terminal The cell to which the device switches, so the terminal device determines not to continue switching to the first target cell.
  • the terminal device may determine whether to continue handover to the first target cell according to the first CHO configuration information and the second CHO configuration information.
  • the terminal device determines whether the CHO configuration information (for example, configuration parameters) corresponding to the first target cell has changed by comparing the first CHO configuration information and the second CHO configuration information, including: determining whether the first target cell is deleted, and /Or, determine whether the CHO trigger condition corresponding to the first target cell has changed, and/or determine whether the relevant information of the first target cell has changed, wherein the relevant information of the first target cell is referred to the above description and will not be repeated.
  • the CHO configuration information for example, configuration parameters
  • the terminal device By comparing the first CHO configuration information and the second CHO configuration information, once the terminal device finds that any parameter corresponding to the first target cell has changed, the terminal device determines not to continue to switch to the first target cell, and the terminal device
  • the second CHO configuration information performs subsequent operations, for example, the judgment of whether the CHO trigger condition is satisfied according to the second CHO configuration information, and further, determines the target cell that can be switched to and tries to access.
  • the terminal device determines that the first target cell has not changed according to the first CHO configuration information and the second CHO configuration information, specifically, for example, the CHO configuration parameter corresponding to the first target cell has not changed, the terminal device determines to continue the handover To the first target cell. If the terminal device determines that the first target cell has changed according to the first CHO configuration information and the second CHO configuration information, specifically, for example, the CHO configuration parameter corresponding to the first target cell changes, the terminal device determines the terminal according to the second CHO configuration information The third target cell to which the device is ready to handover.
  • the terminal device determines that the candidate cells configured through the second CHO configuration information do not include the first target cell according to the first CHO configuration information and the second CHO configuration information, specifically, for example, the second CHO configuration information does not include the first target cell Corresponding to the CHO configuration parameter, the terminal device determines the third target cell to which the terminal device is to be handed over according to the second CHO configuration information.
  • the terminal device determines that the first target cell has changed according to the first CHO configuration information and the second CHO configuration information (for example, determines that the CHO configuration parameter corresponding to the first target cell has changed) or determines that the network device passes the second
  • the CHO configuration information does not configure the first target cell as a candidate cell for the terminal device (for example, the second CHO configuration information does not include the CHO configuration parameters corresponding to the first target cell), and the terminal device determines not to continue switching to the first target cell or stops Switch to the first target cell or stop the random access procedure with the first target cell.
  • the terminal device can select a cell that meets the CHO configuration information, that is, the third target cell, according to the latest CHO configuration information, to try to access, wherein the second CHO configuration information received by the terminal device is the latest CHO configuration information .
  • the terminal device may determine whether the CHO configuration parameter corresponding to the first target cell has changed in many ways according to the first CHO configuration information and the second CHO configuration information.
  • the terminal device may according to whether the second CHO configuration information includes the cell identity of the first target cell (such as CGI and/or PCI), the index corresponding to the first target cell, or the measurement information corresponding to the first target cell (such as measurement frequency). Point or measurement identifier), information used to identify the first target cell to determine whether the configuration parameters of the first target cell have changed, or the terminal device can determine whether the first target cell corresponds to the first CHO configuration information and the second CHO configuration information Whether the CHO configuration information (such as configuration parameters) has changed.
  • the second CHO configuration information includes the cell identity of the first target cell (such as CGI and/or PCI), the index corresponding to the first target cell, or the measurement information corresponding to the first target cell (such as measurement frequency). Point or measurement identifier), information used to identify the first target cell to determine whether the configuration parameters of the first target cell have changed, or the terminal device can determine whether the first target cell corresponds to the first CHO configuration information and the second CHO configuration information Whether the CHO configuration information (such as configuration
  • the terminal device can determine that the candidate cell configured by the network device for the terminal device through the second CHO configuration information does not include the first target cell. Accordingly, the terminal device can determine that it will not continue to switch to the first target cell. Target cell.
  • the terminal device can consider the network device this time
  • the first target cell is not configured as a candidate cell for the terminal device, and it can be considered that the first target cell may no longer be a suitable cell for the terminal device to switch to, so the terminal device determines not to continue to switch to the first target cell.
  • the second CHO configuration information includes the cell identity of the first target cell, the index corresponding to the first target cell, or the measurement information corresponding to the first target cell (for example, the measurement frequency or the measurement identifier), or the identifier used to identify the first target cell
  • the terminal device can determine that the candidate cells configured by the network device for the terminal device through the second CHO configuration information include the first target cell, but the configuration parameters of the first target cell change. Accordingly, the terminal device can determine not to continue to switch to The first target cell.
  • the second CHO configuration information includes the CHO configuration information corresponding to the configured first target cell, it can be considered that the candidate cells that the network device subsequently configures for the terminal device still include the first target cell, but because the first target cell
  • the terminal device may consider that the first target cell may no longer be a suitable cell for the terminal device to switch to, so the terminal device determines not to continue to switch to the first target cell.
  • the second CHO configuration information includes the cell identity of the first target cell, the index corresponding to the first target cell, and the measurement information corresponding to the first target cell (for example, the measurement frequency or the measurement identifier), the information used to identify the first target cell Any one or more of the information, and other configuration parameters corresponding to the first target cell included in the second CHO configuration information are the same as other configuration parameters corresponding to the first target cell included in the first CHO configuration information
  • the terminal device can determine that the candidate cells configured by the network device for the terminal device through the second CHO configuration information include the first target cell, and the configuration parameters of the first target cell have not changed. Accordingly, the terminal device can determine to continue to switch to the first target cell. A target cell.
  • the second CHO configuration information includes the CHO configuration information corresponding to the configured first target cell, it can be considered that the candidate cells that the network device configures for the terminal device still include the first target cell, and the first target cell The corresponding configuration parameters have not changed, and the terminal device can consider that the first target cell is still a suitable cell for the terminal device to switch to, so the terminal device can continue to switch to the first target cell.
  • the terminal device can compare the CHO configuration information corresponding to one or more candidate cells contained in the second CHO configuration information and the CHO configuration information corresponding to one or more candidate cells contained in the first CHO configuration information (wherein
  • the CHO configuration information may include the CHO trigger condition corresponding to the candidate cell and/or related information corresponding to the candidate cell (for example, for the related information corresponding to the candidate cell, refer to the above description, which will not be repeated here) to determine whether the first target cell changes.
  • the CHO trigger condition corresponding to the first target cell has changed, and/or the configuration parameters corresponding to the first target cell (for example, the C-RNTI allocated by the first target cell to the terminal device, and/or , The random access channel RACH resources required to access the first target cell, and/or the resource information corresponding to the first target cell (such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.), etc.), and then determine whether the first target cell has changed.
  • the configuration parameters corresponding to the first target cell for example, the C-RNTI allocated by the first target cell to the terminal device, and/or ,
  • the random access channel RACH resources required to access the first target cell, and/or the resource information corresponding to the first target cell such as physical layer configuration parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.
  • the CHO trigger condition corresponding to the first target cell changes, or the first target If the configuration parameter corresponding to the cell changes, it can be determined that the first target cell has changed. If the first target cell does not change, for example, the configuration parameter of the first target cell does not change, the terminal device can continue to switch to the first target Cell. If the first target cell changes, for example, the configuration parameters of the first target cell change, the terminal device may not continue to switch to the first target cell.
  • the terminal device may determine whether to continue handover to the first target cell according to the second CHO configuration information. further:
  • the terminal device can determine whether the second CHO configuration information includes the cell identity of the first target cell (such as CGI and/or PCI), the index corresponding to the first target cell, or the measurement information corresponding to the first target cell (such as The measurement frequency point or measurement identifier) or other information that can be used to identify the first target cell is used to determine whether the configuration parameter corresponding to the first target cell changes.
  • the cell identity of the first target cell such as CGI and/or PCI
  • the index corresponding to the first target cell such as the index corresponding to the first target cell
  • the measurement information corresponding to the first target cell such as The measurement frequency point or measurement identifier
  • the terminal device can consider the network device as a terminal device this time
  • the configured candidate cells do not include the first target cell, and it can be considered that the first target cell may no longer be a cell suitable for handover to the terminal device, so the terminal device determines not to continue handover to the first target cell.
  • the terminal device can determine not to continue handover to the first target cell, and completely replace the first CHO configuration information with the second CHO configuration information (for example, store the second CHO configuration information). CHO configuration information, and delete the previously stored first CHO configuration information), and then determine the cell to which the terminal device is ready to switch according to the second CHO configuration information.
  • the cell to be handed over determined by the terminal device according to the second CHO configuration information may be the same cell as the first target cell, or may be another cell, which is not limited.
  • the terminal device can first continue the process of handover to the first target cell, and the terminal device performs the random access process with the first target cell at the same time (that is, the terminal After the device determines the first target cell but before successfully switching to the first target cell), it can judge whether the CHO trigger condition is satisfied according to the second CHO configuration information, for example, according to the CHO trigger contained in the second CHO configuration information Condition, and/or information of the candidate cell included in the second CHO configuration information, determine whether the candidate cell configured by the second CHO configuration information meets the CHO trigger condition, and then determine whether to continue handover to the first target cell.
  • the second CHO configuration information for example, according to the CHO trigger contained in the second CHO configuration information Condition, and/or information of the candidate cell included in the second CHO configuration information, determine whether the candidate cell configured by the second CHO configuration information meets the CHO trigger condition, and then determine whether to continue handover to the first target cell.
  • the terminal device while the terminal device is performing a random access process with the first target cell (that is, after the terminal device determines the first target cell but before it has not successfully switched to the first target cell), it restarts according to the second CHO configuration information.
  • the cell to which the terminal device can be handed over is determined (that is, the third target cell). If the cell and the first target cell are the same cell, the terminal device can determine to continue handing over to the first target cell, that is, the terminal device can continue to communicate with the first target cell.
  • the random access process in the first target cell if the cell is different from the first target cell, the terminal device can determine not to continue to switch to the first target cell, and accordingly, the terminal device can try to switch to the terminal device according to The cell re-determined by the second CHO configuration information (that is, the third target cell).
  • the terminal device after the terminal device receives the second CHO configuration information, it can first suspend the handover to the first target cell, and the terminal device according to the second CHO configuration information, or according to the first CHO configuration information and the second CHO configuration information After determining whether the first target cell has changed, it is determined whether to continue handover to the first target cell. In some other embodiments, after the terminal device receives the second CHO configuration information, it can continue the process of handover to the first target cell. Before the terminal device is successfully handed over to the first target cell, the terminal device configures according to the second CHO Information, or after determining whether the first target cell has changed according to the first CHO configuration information and the second CHO configuration information, it is determined whether to continue handover to the first target cell. For the manner in which the terminal device determines whether the first target cell has changed according to the second CHO configuration information, or according to the first CHO configuration information and the second CHO configuration information, reference may be made to the above description, which will not be repeated here.
  • the terminal device can continue the random access procedure with the first target cell, but in some cases, for example, there are obstructions, the terminal device moves quickly, and the channel of the first target cell In situations such as fast fading, the terminal device may not be able to successfully switch to the first target cell.
  • the method 300 further includes: determining the terminal device according to the second CHO configuration information or according to the first CHO configuration information and the second CHO configuration information The second target cell that can be switched to.
  • the second target cell is the cell to which the terminal device and the first target cell are re-determined after the handover process fails.
  • the second target cell is one of the candidate cells configured by the network device for the terminal device that meets the CHO trigger condition Community.
  • the second target cell and the first target cell may be the same or different.
  • the terminal device determines the second target cell.
  • the second CHO configuration information is based on the first CHO configuration information, and is used to modify (for example, add) a candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information).
  • modify/Delete if the terminal device fails to successfully switch to the first target cell, the terminal device can determine the second target cell according to the first CHO configuration information and the second CHO configuration information.
  • the second CHO configuration information can be used to add new candidate cells, and/or to perform configuration parameters of candidate cells that have been configured (for example, candidate cells that have been configured through the first CHO configuration information) Modify, and/or delete the candidate cell that has been configured (for example, the candidate cell that has been configured through the first CHO configuration information).
  • the terminal device changes the configuration parameters according to the first CHO configuration information and the second CHO configuration information. For example, based on the first CHO configuration information, if the second CHO configuration information is used to add a new candidate cell, the terminal device adds a new candidate cell, including adding the CHO trigger condition and/or corresponding to the new candidate cell.
  • the terminal device can modify the trigger condition corresponding to the configured candidate cell and/or the related information of the configured candidate cell to the corresponding CHO trigger condition after modification of the configured candidate cell and/or the corresponding related information after modification ; If the second CHO configuration information is used to delete the candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information), the terminal device can delete the CHO corresponding to the candidate cell that has been configured Trigger conditions and/or delete related information of the candidate cell that has been configured, and/or delete the measurement identifier and measurement frequency point corresponding to the candidate cell that has been configured.
  • the terminal device can determine the latest CHO configuration information (that is, the updated CHO configuration information) according to the first CHO configuration information and the second CHO configuration information, The terminal device determines the second target cell according to the latest CHO configuration information.
  • the second CHO configuration information is the CHO full configuration information sent by the network device to the terminal device. Since the second CHO configuration information and the first CHO configuration information are decoupled and independent, if the terminal device fails to switch successfully To the first target cell, the terminal device can determine the second target cell according to the second CHO configuration information. The terminal device may determine whether the CHO trigger condition is satisfied according to the second CHO configuration information, for example, according to the CHO trigger condition contained in the second CHO configuration information, and/or the candidate cell information contained in the second CHO configuration information, It is determined whether the CHO trigger condition is satisfied, and the second target cell is determined from the candidate cells configured through the second CHO configuration information.
  • the terminal device can use the second CHO configuration information or the first CHO configuration information and the second CHO configuration information. Determine the third target cell to which the terminal device can be handed over.
  • the third target cell is a cell re-determined by the terminal device to switch to when the CHO configuration parameter corresponding to the first target cell changes.
  • the third target cell may be a candidate cell configured by the network device for the terminal device to meet the CHO trigger condition Of a community.
  • the third target cell and the first target cell may be the same or different.
  • the manner in which the terminal device determines the third target cell is the same as the manner in which the second target cell is determined, and is only briefly described below. For details, please refer to the description of determining the second target cell above.
  • the second CHO configuration information is based on the first CHO configuration information, and is used to modify the candidate cell that has been configured (for example, the candidate cell has been configured through the first CHO configuration information) (for example, Add/modify/delete) information, the terminal device can determine the third target cell according to the first CHO configuration information and the second CHO configuration information.
  • the second CHO configuration information can be used to add new candidate cells, and/or to perform configuration parameters of candidate cells that have been configured (for example, candidate cells that have been configured through the first CHO configuration information) Modify, and/or delete the candidate cell that has been configured (for example, the candidate cell that has been configured through the first CHO configuration information).
  • the terminal device changes the configuration parameters according to the first CHO configuration information and the second CHO configuration information.
  • the terminal device can determine the latest CHO configuration information (that is, the updated CHO configuration information) according to the first CHO configuration information and the second CHO configuration information, and the terminal device determines the third target cell according to the latest CHO configuration information.
  • the second CHO configuration information is the CHO full configuration information sent by the network device to the terminal device. Since the second CHO configuration information and the first CHO configuration information are decoupled and independent, the terminal device can be based on the second CHO configuration information.
  • the configuration information determines the third target cell.
  • the terminal device may determine whether the CHO trigger condition is satisfied according to the second CHO configuration information, for example, according to the CHO trigger condition contained in the second CHO configuration information, and/or the candidate cell information contained in the second CHO configuration information, It is determined whether the CHO trigger condition is satisfied, and the third target cell is determined from the candidate cells configured through the second CHO configuration information.
  • the first CHO configuration information and/or the second CHO configuration information may be carried in a radio resource control RRC message.
  • the network device sends the first CHO configuration information and/or the second CHO configuration information to the terminal device through the RRC message.
  • the RRC message may be an existing RRC message, such as an RRC reconfiguration message, or a newly defined RRC message, which is not specifically limited in the embodiment of the present application.
  • the source network device is the source base station and the terminal device is the UE as an example for illustration.
  • the method 400 may include step S410 to step S450.
  • N the maximum number of candidate cells that the network device can configure for the terminal device.
  • N is a positive integer.
  • the embodiment of the present application takes as an example that N is greater than 3 and the network device is a terminal device for the first configuration of two candidate cells (cell #1 and cell #2). It should be understood that the number x of candidate cells that the network device finally configures for the terminal device should be greater than or equal to 1 and less than or equal to N.
  • the source base station sends a first message to the UE.
  • the first message includes the first CHO configuration information configured by the network device for the terminal device.
  • the first CHO configuration information includes the corresponding candidate cells configured by the network device for the terminal device.
  • CHO configuration information may include the CHO trigger condition corresponding to the candidate cell and/or related information corresponding to the candidate cell (for example, the related information corresponding to the candidate cell includes the cell identity of the candidate cell, and the information corresponding to the candidate cell.
  • Frequency information at least one of the C-RNTI allocated by the candidate cell to the terminal equipment, the random access channel RACH resource information required to access the candidate cell, etc.), and the resource information corresponding to the candidate cell (such as physical layer configuration) Parameters, MAC layer configuration parameters, RLC layer configuration parameters, PDCP layer configuration parameters, SDAP layer configuration parameters, RRC layer configuration parameters, etc.).
  • Figure 4 exemplarily shows two candidate cells, namely cell #1 (cell1) and cell #2 (cell2).
  • the first message includes CHO configuration information corresponding to cell1 and CHO configuration information corresponding to cell2, that is, the first CHO configuration information includes CHO configuration information corresponding to cell1 and CHO configuration information corresponding to cell2.
  • the first message may be an RRC message. Specifically, the first message may reuse an existing RRC message, such as an RRC reconfiguration message.
  • the first message may include information for adding or modifying a certain/certain candidate cell.
  • the information element of CHO configuration information for example, ToAddModList information element; or, the first message may be a newly defined RRC message, for example, the first message is a conditional radio resource control reconfiguration (CondRRCReconfiguration) message, or It is another naming/expression form, and the embodiment of the application does not specifically limit it.
  • CondRRCReconfiguration conditional radio resource control reconfiguration
  • the first message is a newly defined RRC message (such as a CondRRCReconfiguration message) as an example for description.
  • the first message may include a reconfiguration to add mod list (cond reconfiguration to add mod list or CondReconfigurationToAddModList) cell, which is used to add or modify the CHO configuration information of the corresponding candidate cell.
  • the reconfiguration addition modification list information element includes a reconfiguration (cond reconfiguration or CondReconfiguration) information element corresponding to cell1 and a reconfiguration (cond reconfiguration or CondReconfiguration) information element corresponding to cell2.
  • the CondReconfiguration information element corresponding to cell1 carries the CHO configuration information corresponding to cell1
  • the CondReconfiguration information element corresponding to cell2 carries the CHO configuration information corresponding to cell2.
  • the CondReconfiguration cell can be used to carry the CHO configuration information, and the CHO configuration information corresponding to each candidate cell can be carried in the corresponding CondReconfiguration cell.
  • the newly defined RRC message (such as the CondRRCReconfiguration message) may adopt the following message structure/ASN.1 encoding format, but it should be understood that the following message structure format is also applicable to other forms of first messages.
  • step S420 the UE determines cell #1 as the target cell according to the first message, and the target cell is the cell to which the terminal device is to be handed over.
  • the target cell ie, cell #1
  • the target cell may be, for example, the cell with the highest signal quality among multiple candidate cells that meet the CHO trigger condition, or the priority among multiple candidate cells that meet the CHO trigger condition.
  • the cell with the highest for example, the highest frequency priority
  • has the most good beams (a good beam means that the signal quality of the beam is higher than a predetermined threshold.
  • the predetermined threshold It may be included in the first message, or it may be a cell agreed in the agreement, which is not limited in this application), or any one of multiple candidate cells that meet the CHO trigger condition, or a cell that meets other conditions. This embodiment Not limited.
  • step S430 after the UE selects cell #1 as the target cell, the UE attempts to access cell #1.
  • the UE receives a second message sent by the source base station, and the second message includes the second CHO configuration information.
  • the process of the UE trying to access cell1 includes: before the UE sends the preamble to cell1; and/or the process of RACH between the UE and cell1.
  • the process of the UE trying to access cell1 may specifically include: before the UE sends a preamble to cell1; and/or after the UE sends the preamble to cell1 and before the UE receives the random access response RAR; and/or, After the UE receives the RAR and before the UE sends the RRC reconfiguration complete message to cell1; and/or, after the UE sends the preamble to cell1 and before the UE sends the RRC reconfiguration complete message to cell1.
  • the process of UE attempting to access cell1 includes: before the UE sends an RRC reconfiguration complete message to cell1.
  • the second message may be an RRC message. Specifically, the second message may reuse an existing RRC message, such as an RRC reconfiguration message.
  • the second message may contain information for adding or modifying a certain candidate cell or cells.
  • Information elements of CHO configuration information such as ToAddModList information elements, and/or, the second message may include information elements for deleting related CHO configuration information of a certain/certain candidate cells, such as ToRemoveList information elements; or
  • the second message may be a newly defined RRC message.
  • the second message is a CondRRCReconfiguration message, or another naming/expression form, which is not specifically limited in the embodiment of the present application.
  • the network device separately sends the first CHO configuration information and the second CHO configuration information to the terminal device through RRC messages (such as existing RRC messages or newly defined RRC messages) as an example.
  • RRC messages such as existing RRC messages or newly defined RRC messages
  • the network device may also provide CHO configuration information to the terminal device through other messages, resources or other methods.
  • the UE processes the configuration information according to the method (for example, step S440 to step S440 in FIG. 4). S450) also applies.
  • the second CHO configuration information is based on the first CHO configuration information and is used to configure candidate cells (for example, the candidate cell has been configured through the first CHO configuration information).
  • Cell to make changes (such as adding/modifying/deleting) information as an example.
  • the second CHO configuration information can be used to add a new candidate cell, and/or modify the configuration parameters of a candidate cell that has been configured (for example, a candidate cell that has been configured through the first CHO configuration information) , And/or, delete a candidate cell that has been configured (for example, a candidate cell that has been configured through the first CHO configuration information), which will be discussed in different situations below.
  • step S430a the source base station sends a second message carrying second CHO configuration information to the UE, where the second CHO configuration information includes CHO configuration information corresponding to cell1. That is, the second CHO configuration information is used to modify the CHO configuration information corresponding to the candidate cell cell1 that has been configured with the first CHO configuration information.
  • the second message is a newly defined RRC message (such as a CondRRCReconfiguration message) as an example for description.
  • the second message may include a CondReconfigurationToAddModList information element, and further, the CondReconfigurationToAddModList information element includes a CondReconfiguration information element corresponding to cell1.
  • the CondReconfiguration cell corresponding to cell1 carries the modified CHO configuration information corresponding to cell1.
  • the second CHO configuration information may also include CHO configuration information corresponding to the newly added candidate cell.
  • the embodiment of this application takes the newly added candidate cell as cell3 as an example.
  • the second CHO configuration information is not only used to modify the CHO configuration information corresponding to cell1 configured through the first CHO configuration information, but also to add the corresponding cell3 CHO configuration information.
  • the network device in addition to modifying the CHO configuration information corresponding to cell1, the network device also needs to add other cells as candidate cells for CHO.
  • the second message may include a CondReconfigurationToAddModList information element.
  • the CondReconfigurationToAddModList information element includes a CondReconfiguration information element corresponding to cell1 and a CondReconfiguration information element corresponding to cell3.
  • the CondReconfiguration information element corresponding to cell1 carries the modified CHO configuration information corresponding to cell1
  • the CondReconfiguration information element corresponding to cell3 carries the CHO configuration information corresponding to the newly added candidate cell cell3.
  • step S440a the UE determines whether the target cell has changed.
  • the UE After receiving the second CHO configuration information, the UE determines whether the target cell determined in step S420, namely cell1, has changed according to the second CHO configuration information, for example, determines whether the CHO configuration information corresponding to cell1 has changed, and then determines whether to continue to switch to cell1. Specifically, for the method for determining whether the CHO configuration information corresponding to cell1 has changed, reference may be made to the various methods of "determining whether the CHO configuration parameter corresponding to the first target cell has changed" above, which will not be repeated here. Specifically, for example, the UE determines that cell1 has changed according to the second CHO configuration information.
  • step S450a after the UE determines that the target cell has changed, the UE determines that it will not continue to access cell1.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information.
  • the UE can store the updated CHO configuration information.
  • CHO configuration information and the UE re-determines whether the CHO trigger condition is satisfied according to the updated CHO configuration information, and then determines the target cell.
  • the UE no longer continues to access cell1, including: if the UE has not sent a preamble to cell1, the UE does not send a preamble to cell1; if the UE is performing a RACH process with cell1, the UE stops the ongoing RACH process with cell1.
  • the UE will not send a preamble to cell1; if the UE has already sent a preamble to cell1 but is waiting to receive a random access response RAR, the UE will no longer receive the RAR; if the UE has already If the RAR is received but the RRC reconfiguration complete message is not sent to cell1, the UE does not send the RRC reconfiguration complete message to cell1; if the UE does not perform the random access procedure with cell1 (ie RACH-less handover) after determining cell1, The UE stops the ongoing RACH process with cell1, including: after the UE determines cell1, the UE does not send an RRC reconfiguration complete message to cell1.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, including: the UE modifies/updates the configured candidate cells according to the first CHO configuration information and the second CHO configuration information, for example Modify/update the CHO configuration information corresponding to cell1; or the UE adds new candidate cells according to the first CHO configuration information and the second CHO configuration information.
  • the network device in addition to updating the CHO configuration information corresponding to cell1, the network device also provides cell3 correspondence
  • the UE also adds cell3 as a candidate cell, that is, adds the CHO configuration information corresponding to cell3, and stores the CHO configuration information corresponding to cell3.
  • the UE stops the random access process with cell1 according to the updated CHO configuration information, and the UE can re-search for the target cell that meets the CHO trigger condition.
  • the target cell re-determined by the UE can still be cell1, or it can be a candidate cell except cell1 Other cells that meet the CHO trigger conditions.
  • the source base station sends a second message carrying second CHO configuration information to the UE, where the second message is used to delete cell1 (or, to delete CHO configuration information corresponding to cell1).
  • the second CHO configuration information includes the cell index corresponding to cell1, the cell identifier corresponding to cell1 (such as CGI and/or PCI), the measurement information corresponding to cell1 (such as measurement frequency or measurement identifier), or the CHO configuration corresponding to cell1 Information or other information that can be used to identify any one or more of cell1.
  • the second message is a newly defined RRC message (such as a CondRRCReconfiguration message) as an example for description.
  • the second message may include a reconfiguration delete list (cond reconfiguration to remove list or CondReconfigurationToRemoveList) information element, and further, the reconfiguration delete list information element includes a cell index corresponding to cell1, a cell identifier corresponding to cell1, and cell1. Any one or more of the corresponding measurement information or CHO configuration information corresponding to cell1 or other information that can be used to identify cell1.
  • the cell index (cellIndex) corresponding to cell1 may be provided by the network device when providing the UE with the CHO configuration information corresponding to cell1.
  • the first message may include the cell index corresponding to cell1; the cell index corresponding to cell1 may also be in accordance with Determined by a preset rule, for example, the cell index is determined in the order of initial configuration, the cell index corresponding to the first configured cell in the first message is 1, the cell index corresponding to the second configured cell is 2, and so on.
  • the cell identifier corresponding to cell1 may include the PCI of cell1 and/or the CGI of cell1, and the cell identifier corresponding to cell1 may also include frequency information corresponding to cell1.
  • the measurement information corresponding to cell1 may include a measurement identification (measurement identification, MeasID) and/or a measurement frequency point (measurement object, MeasObject).
  • the measurement identifier and measurement frequency point can be provided by the network device when providing the CHO configuration information for the UE.
  • Each candidate cell has a corresponding measurement identifier and measurement frequency point, that is, the candidate cell corresponds to the measurement identifier/measurement frequency point one-to-one .
  • the measurement information corresponding to cell1 may also include report configuration information (for example, ReportConfig).
  • the second CHO configuration information may also include the cell index, cell identification, measurement information or CHO configuration information corresponding to other candidate cells except cell1, or other information that can be used to identify the candidate cell, that is, the second CHO configuration
  • the information can be used not only to delete the CHO configuration information corresponding to cell1, but also to delete the CHO configuration information corresponding to candidate cells other than cell1 that have been configured.
  • step S440b the UE determines whether the target cell has changed.
  • the UE After receiving the second CHO configuration information, the UE determines whether the target cell determined in step S420, namely cell1, has changed according to the second CHO configuration information, for example, determines whether the CHO configuration information corresponding to cell1 has changed, and then determines whether to continue to switch to cell1. Specifically, for the method of determining whether the CHO configuration information corresponding to cell1 has changed, reference may be made to the various methods of "determining whether the CHO configuration parameter corresponding to the first target cell has changed" above, which will not be repeated. Specifically, for example, the UE determines that cell1 is deleted according to the second CHO configuration information. In other words, the UE determines that cell1 has changed according to the second CHO configuration information.
  • step S450b after the UE determines that the target cell has changed, the UE determines that it will not continue to access cell1.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, and the UE can store the updated CHO configuration Information, and the UE re-determines whether the CHO trigger condition is satisfied according to the updated CHO configuration information, and then determines the target cell.
  • the UE no longer continues to access cell1, including: if the UE has not sent a preamble to cell1, the UE does not send a preamble to cell1; if the UE is performing a RACH process with cell1, the UE stops the ongoing RACH process with cell1.
  • the specific manner of "the UE stops the ongoing RACH process with cell1" can refer to the related description in step S450a, which will not be repeated.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, including: the UE deletes the candidate cells that have been configured according to the first CHO configuration information and the second CHO configuration information, such as deleting cell1 (Or, delete the CHO configuration information corresponding to cell1, that is, the UE deletes the CHO configuration information corresponding to cell1 from the CHO configuration information stored by the UE), if the CondReconfigurationToRemoveList information element also contains the cell index corresponding to other candidate cells except cell1, Cell identification, measurement information or CHO configuration information or other information that can be used to identify candidate cells, in addition to deleting cell1, the UE will also delete other candidate cells indicated by the CondReconfigurationToRemoveList cell (or, delete other candidate cells indicated by the CondReconfigurationToRemoveList cell) CHO configuration information corresponding to the cell).
  • the UE when the UE deletes the CHO configuration information corresponding to a cell (such as cell1), it can be understood that the UE excludes the cell (such as cell1) from the CHO candidate cell list, that is, the UE no longer determines whether the cell meets the CHO trigger condition. Or, the UE no longer attempts to switch to access the cell.
  • the UE stops the random access process with cell1 according to the updated CHO configuration information, and the UE can re-search for the target cell that meets the CHO trigger condition.
  • the target cell re-determined by the UE can be the candidate cells other than cell1 that meet the CHO trigger Condition of the cell.
  • step S430c the source base station sends a second message carrying second CHO configuration information to the UE, where the second CHO configuration information includes CHO configuration information corresponding to cell2. That is, the second CHO configuration information is used to modify the CHO configuration information corresponding to the candidate cell cell2 that has been configured with the first CHO configuration information.
  • the second message is a newly defined RRC message (such as a CondRRCReconfiguration message) as an example for description.
  • the second message may include a CondReconfigurationToAddModList information element, and further, the CondReconfigurationToAddModList information element includes a CondReconfiguration information element corresponding to cell2.
  • the CondReconfiguration information element corresponding to cell2 carries the modified CHO configuration information corresponding to cell2.
  • the second CHO configuration information may also include CHO configuration information corresponding to the newly added candidate cell.
  • the embodiment of this application takes the newly added candidate cell as cell3 as an example.
  • the second CHO configuration information is not only used to modify the CHO configuration information corresponding to cell2 configured in the first CHO configuration information, but also used to add cell3.
  • the corresponding CHO configuration information In other words, in addition to modifying the CHO configuration information corresponding to cell2, the network device also needs to add other cells as candidate cells for CHO.
  • the second message may include a CondReconfigurationToAddModList information element.
  • the CondReconfigurationToAddModList information element includes a CondReconfiguration information element corresponding to cell2 and a CondReconfiguration information element corresponding to cell3.
  • the CondReconfiguration information element corresponding to cell2 carries the modified CHO configuration information corresponding to cell2, and the CondReconfiguration information element corresponding to cell3 carries the CHO configuration information corresponding to the newly added candidate cell cell3.
  • step S440c the UE determines whether the target cell has changed.
  • the UE After receiving the second CHO configuration information, the UE determines whether the target cell determined in step S420, namely cell1, has changed according to the second CHO configuration information, for example, determines whether the CHO configuration information corresponding to cell1 has changed. Furthermore, it is determined whether to continue switching to cell1. Specifically, for the method of determining whether the CHO configuration information corresponding to cell1 has changed, reference may be made to the various methods of "determining whether the CHO configuration parameter corresponding to the first target cell has changed" above, which will not be repeated. Specifically, for example, the UE determines that cell1 has not changed according to the second CHO configuration information.
  • step S450c after the UE determines that the target cell has not changed, the UE continues to switch to cell #1 (ie cell1).
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, and the UE can store the update After the CHO configuration information.
  • the UE continues to switch to cell1, including: if the UE has not sent the preamble to cell1, the UE sends the preamble to cell1; if the UE is performing the RACH process with cell1, the UE continues to perform the RACH process with cell1, specifically, if the UE has already When the preamble is sent to cell1, the UE waits to receive the random access response RAR; if the UE has received the RAR, the UE sends an RRC reconfiguration complete message to cell1. If it is RACH-less handover (after the UE determines cell1, the random access procedure with cell1 is not performed), the UE continues to switch to cell1, including: the UE sends an RRC reconfiguration complete message to cell1.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, including: the UE can modify the CHO configuration information corresponding to the candidate cell that has been configured, for example, modify the CHO configuration information corresponding to cell2; and /Or, the UE adds a new candidate cell, for example, if the network device also provides the CHO configuration information corresponding to cell3, the UE adds cell3 as a candidate cell, that is, adds the CHO configuration information corresponding to cell3, and stores the CHO configuration corresponding to cell3 information.
  • the UE can release the stored CHO configuration information corresponding to all candidate cells except the target cell (ie cell1).
  • the UE re-determines the target cell according to the updated CHO configuration information.
  • the source base station sends a second message carrying second CHO configuration information to the UE, and the second message is used to delete cell2 (or, to delete CHO configuration information corresponding to cell2).
  • the optional second CHO configuration information includes the cell index corresponding to cell2, the cell identifier corresponding to cell2 (such as CGI and/or PCI), the measurement information corresponding to cell2 (such as measurement frequency or measurement identifier), or the CHO configuration information corresponding to cell2. Or any one or more items of information that can be used to identify cell2.
  • the second message is a newly defined RRC message (such as a CondRRCReconfiguration message) as an example for description.
  • the second message may include a reconfiguration delete list (cond reconfiguration to remove list or CondReconfigurationToRemoveList) information element.
  • the reconfiguration delete list information element includes the cell index corresponding to cel2, the cell identifier corresponding to cell2, and cell2. Any one or more of the corresponding measurement information or CHO configuration information corresponding to cell2 or other information that can be used to identify cell2.
  • the cell index (cellIndex) corresponding to cell2 may be provided by the network device when providing the UE with the CHO configuration information corresponding to cell2.
  • the first message may include the cell index corresponding to cell2; the cell index corresponding to cell2 may also be in accordance with Determined by a preset rule, for example, the cell index is determined in the order of initial configuration, the cell index corresponding to the first configured cell in the first message is 1, the cell index corresponding to the second configured cell is 2, and so on.
  • the cell identifier corresponding to cell2 may include the PCI of cell2 and/or the CGI of cell2, and the cell identifier corresponding to cell2 may also include frequency information corresponding to cell2.
  • the measurement information corresponding to cell2 may include measurement identification (measure identification, MeasID) and/or measurement frequency (measure object, MeasObject).
  • the measurement identifier and measurement frequency point can be provided by the network device when providing the CHO configuration information for the UE.
  • Each candidate cell has a corresponding measurement identifier and measurement frequency point, that is, the candidate cell corresponds to the measurement identifier/measurement frequency point one-to-one .
  • the measurement information corresponding to cell2 may also include report configuration information (for example, ReportConfig).
  • the second CHO configuration information may also include the cell index, cell identification, measurement information or CHO configuration information corresponding to other candidate cells except cell2, or other information that can be used to identify the candidate cell, that is, the second CHO configuration
  • the information can be used not only to delete the CHO configuration information corresponding to cell2, but also to delete the CHO configuration information corresponding to candidate cells other than cell2 that have been configured.
  • step S440d the UE determines whether the target cell has changed.
  • the UE After receiving the second CHO configuration information, the UE determines whether the target cell determined in step S420, namely cell1, has changed according to the second CHO configuration information, for example, determines whether the CHO configuration information corresponding to cell1 has changed. Furthermore, it is determined whether to continue switching to cell1. Specifically, for the method of determining whether the CHO configuration information corresponding to cell1 has changed, reference may be made to the various methods of "determining whether the CHO configuration parameter corresponding to the first target cell has changed" above, which will not be repeated. Specifically, for example, the UE determines that cell1 has not changed according to the second CHO configuration information.
  • step S450d after the UE determines that the target cell has not changed, the UE continues to switch to cell #1 (ie cell1).
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, and the UE can store the update After the CHO configuration information.
  • the UE updates the CHO configuration information according to the first CHO configuration information and the second CHO configuration information, including: the UE deletes the candidate cells that have been configured according to the first CHO configuration information and the second CHO configuration information, such as deleting cell2 (Or, delete the CHO configuration information corresponding to cell1, that is, the UE deletes the CHO configuration information corresponding to cell1 from the CHO configuration information stored by the UE); if the CondReconfigurationToRemoveList cell also contains cells corresponding to other candidate cells except cell1 and cell2 Index, cell identification, measurement information or CHO configuration information or other information that can be used to identify candidate cells, in addition to deleting cell2, the UE will also delete other candidate cells indicated by the CondReconfigurationToRemoveList cell (or delete other cells indicated by the CondReconfigurationToRemoveList cell) CHO configuration information corresponding to the candidate cell
  • the UE when the UE deletes the CHO configuration information corresponding to a cell (such as cell2), it can be understood that the UE excludes the cell (such as cell2) from the CHO candidate cell list, that is, the UE no longer judges whether the cell meets the CHO trigger condition. Or, the UE no longer attempts to switch to access the cell.
  • the UE can release the stored CHO configuration information corresponding to all candidate cells except the target cell (ie cell1).
  • the UE re-determines the target cell according to the updated CHO configuration information.
  • the second CHO configuration information may be carried in the cell.
  • the modified CHO configuration information corresponding to the candidate cell included in the second CHO configuration information and the CHO configuration corresponding to the added candidate cell The information can be carried in the same information element, for example, in the aforementioned CondReconfigurationToAddModList information element, the information used to delete the CHO configuration information corresponding to the candidate cell included in the second CHO configuration information can be carried in other information elements, such as the aforementioned proposal. And the CondReconfigurationToRemoveList cell.
  • the modified CHO configuration information corresponding to the candidate cell included in the second CHO configuration information, the CHO configuration information corresponding to the added candidate cell, and the information used to delete the CHO configuration information corresponding to the candidate cell may be respectively It is carried in different information elements.
  • the modified CHO configuration information corresponding to the candidate cell can be carried in the CondReconfigurationToModList cell, and the CHO configuration information corresponding to the added candidate cell is carried in the new reconfiguration list ( In the CondReconfigurationToAddList cell, the information used to delete the CHO configuration information corresponding to the candidate cell is carried in the Reconfiguration Delete List (CondReconfigurationToRemoveList) cell, which is not specifically limited in the embodiment of the present application.
  • the specific cell configuration form can be determined by the network as required.
  • the UE when the UE tries to access the determined target cell (for example, before the UE sends a preamble to the target cell or the UE is in the process of RACH with the target cell), if When the network side modifies/deletes the relevant configuration of the target cell, the UE stops the RACH process with the target cell, modifies/deletes the CHO configuration information corresponding to the target cell, and the UE restarts the new target cell according to the updated CHO configuration information
  • the network side modifies/deletes For the CHO configuration information corresponding to other candidate cells (non-target cells), the UE can continue the RACH process with the target cell, and modify/delete the CHO configuration information corresponding to other candidate cells.
  • the UE can perform correct processing according to the CHO configuration information sent by the network, so that the understanding and behavior of the UE and the network side can be consistent, thereby improving the reliability of conditional switching and improving system performance .
  • the operations implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be configured on the terminal device, and the operations implemented by the network device can also be implemented by the network device.
  • the components such as chips or circuits are implemented.
  • Fig. 5 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device 500 in FIG. 5 may be a specific example of the terminal device 120 in FIG. 1.
  • the communication device 500 shown in FIG. 5 may be used to execute the method shown in FIG. 3, and may specifically implement the embodiment shown in FIG. 4, and to avoid redundancy, the description will not be repeated.
  • the communication device 500 shown in FIG. 5 includes a first processing module 510 and a second processing module 520.
  • the first processing module 510 is configured to determine a first target cell according to the first condition handover CHO configuration information, where the first target cell is a cell to which the terminal device is ready to handover.
  • the second processing module 520 is configured to determine whether to continue handover to the first target cell according to the second CHO configuration information if second CHO configuration information is received during the process of trying to access the first target cell
  • the process of attempting to access the first target cell includes: before sending a preamble to the first target cell; and/or, performing random access with the first target cell In the process of RACH.
  • the second processing module 520 is specifically configured to determine, according to the second CHO configuration information, that the CHO configuration parameter corresponding to the first target cell has not changed, and determine to continue handover to the first target cell.
  • the first processing module 510 is further configured to perform according to the second CHO configuration information, or according to the first CHO configuration information And the second CHO configuration information to determine the second target cell to which the communication device 500 is ready to be handed over.
  • the second processing module 520 is specifically configured to determine, according to the second CHO configuration information, that the CHO configuration parameter corresponding to the first target cell has changed, according to the second CHO configuration information or according to the first CHO configuration information.
  • the configuration information and the second CHO configuration information determine the third target cell to which the communication device 500 is ready to handover.
  • the first processing module 510 may also perform actions or operations performed by the second processing module 520; the second processing module 520 may also perform actions or operations performed by the first processing module 510.
  • the first CHO configuration information and/or the second CHO configuration information are carried in a radio resource control RRC message.
  • the communication device 500 further includes a receiving module configured to receive the first CHO configuration information and/or the second CHO configuration information.
  • the communication device 500 further includes a storage module configured to store program instructions and/or data.
  • the first processing module 510 and the second processing module 520 may be implemented by a processor.
  • the receiving module may be a communication interface, where the communication interface may be a transceiver, circuit, bus, module, pin, or other type of communication interface.
  • the storage module may be a memory. The above modules can be separated from each other, and the modules can also be coupled or integrated.
  • Fig. 6 is a schematic structural diagram of a device provided by an embodiment of the present application.
  • the apparatus 600 shown in FIG. 6 may correspond to the communication apparatus described above, such as a terminal device.
  • the apparatus 600 may be a specific example of the terminal device 120 in FIG. 1.
  • the device 600 includes: a processor 602.
  • the processor 602 is used to implement corresponding control management operations.
  • the processor 602 is used to support the communication device to perform the method or operation or function shown in FIG. 3 or FIG. 4 in the foregoing embodiment.
  • the apparatus 600 may further include: a memory 601 and a communication interface 603; the processor 602, the communication interface 603, and the memory 601 may be connected to each other or through the bus 604.
  • the communication interface 603 is used to support the communication device to communicate, and the memory 601 is used to store the program code and data of the communication device.
  • the processor 602 calls the code or data stored in the memory 601 to implement corresponding operations.
  • the memory 601 may or may not be coupled with the processor.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 602 may be a central processing unit, a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination that implements computing functions, for example, a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on.
  • the communication interface 603 may be a transceiver, circuit, bus, module, or other type of communication interface.
  • the bus 604 may be a peripheral component interconnect standard (PCI) bus or an extended industry standard architecture (EISA) bus, etc.
  • PCI peripheral component interconnect standard
  • EISA extended industry standard architecture
  • the bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in FIG. 6, but it does not mean that there is only one bus or one type of bus.
  • An embodiment of the present application also provides a communication system, including a network device and the terminal device described above.
  • the embodiment of the present application also provides a computer program storage medium, the computer program storage medium has program instructions, and when the program instructions are executed by a processor, the processor executes the switching method described above.
  • An embodiment of the present application further provides a chip system, characterized in that the chip system includes at least one processor, and when the program instructions are executed in the at least one processor, the at least one processor is caused to execute the above Switch method.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请提供一种切换方法、通信装置和终端设备，该切换方法包括：根据第一条件切换CHO配置信息确定第一目标小区，该第一目标小区为终端设备准备切换至的小区；在尝试接入该第一目标小区的过程中，如果接收到第二CHO配置信息，根据该第二CHO配置信息确定是否继续切换至该第一目标小区。上述技术方案中，在终端设备尝试接入第一目标小区过程中，如果终端设备接收到第二CHO配置信息，终端设备需要根据第二CHO配置信息确定是否要继续接入之前确定的第一目标小区，使得终端设备能够根据网络提供的CHO配置信息进行正确的处理，从而提高条件切换的可靠性，保证系统性能。

Description

切换方法、通信装置和终端设备
本申请要求于2019年08月09日提交中国专利局、申请号为201910736192.5、申请名称为“切换方法、通信装置和终端设备”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
本申请涉及通信领域，并且更具体地，涉及一种切换方法、通信装置和终端设备。
背景技术
在移动通信系统中，传统的切换流程中，连接态终端设备的移动性管理是由网络设备控制的，即网络设备通过发送切换消息指示终端设备切换到哪个小区以及如何进行切换。传统的切换机制可以包括，源网络设备(即源小区所属的网络设备)向终端设备发送切换消息以控制终端设备从源小区切换到目标小区，终端设备在接收到该切换消息后，根据切换消息中包含的信息接入目标小区。因此，切换消息的成功发送是保证传统切换机制下成功切换的必要条件。然而，在某些移动通信系统例如长期演进(long term evolution，LTE)系统或第五代移动通信技术(5th-generation，5G)(尤其是高频场景)中，信道质量的快速衰减、或者终端设备的快速移动以及物体的遮挡，或者测量、切换准备的持续时间较长等都会导致切换消息发送失败，进而导致切换失败，降低切换成功率。
鉴于上述问题，现有技术提出条件切换(conditional handover，CHO)机制以提升切换成功率，即源网络设备在源链路质量较好时向终端设备发送条件切换CHO配置信息，该配置信息中包括网络设备为该终端设备配置的切换触发条件以及该切换触发条件对应的一个或多个候选小区的信息。终端设备在接收到该CHO配置信息后，根据该配置信息判断各候选小区是否满足切换触发条件，将满足切换触发条件的某候选小区作为目标小区，从而切换到该目标小区。由于CHO机制中，源网络设备在源链路通信质量较好的情况下向终端设备发送CHO配置信息，因此保证了该配置信息的发送成功率，进而，终端设备根据该配置信息选择目标小区并进行切换，可以提高切换的成功率。
CHO机制中，一般情况下，终端设备根据CHO配置信息确定出目标小区后即可与目标小区进行随机接入流程，随机接入成功后，即可以认为终端设备已经从当前服务小区成功切换至目标小区。但在某些情况下，在终端设备尝试随机接入到目标小区的过程中，终端设备还可能再接收到网络设备发送的CHO配置信息，终端设备后续接收到CHO配置信息后，该如何处理是需要解决的问题，目前现有技术中没有考虑在这种情形下终端设备如何进行正确处理从而提高条件切换可靠性的问题。
发明内容
本申请提供一种切换方法、通信装置和终端设备，能够提高条件切换的可靠性，保证 系统性能。
第一方面，提供一种切换方法，包括：根据第一条件切换CHO配置信息确定第一目标小区，所述第一目标小区为终端设备准备切换至的小区；在尝试接入所述第一目标小区的过程中，如果接收到第二CHO配置信息，根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区；其中，所述在尝试接入所述第一目标小区的过程中，包括：在向所述第一目标小区发送前导码之前；和/或，在与所述第一目标小区进行随机接入RACH的过程中。
本申请实施例提供的技术方案中，终端设备根据第一CHO配置信息确定第一目标小区，在终端设备尝试接入第一目标小区过程中，如果终端设备接收到第二CHO配置信息，终端设备需要根据第二CHO配置信息确定是否要继续接入之前确定的第一目标小区，使得终端设备能够根据网络提供的CHO配置信息进行正确的处理，从而提高条件切换的可靠性，保证系统性能。
网络设备可以为终端设备配置一个或多个候选小区，第一目标小区包含在该一个或多个候选小区中，该第一目标小区为该一个或多个候选小区中满足CHO触发条件的小区。
该第一CHO配置信息可以包括CHO触发条件和候选小区的相关信息。CHO触发条件可以包括CHO触发事件类型和相应的门限值，其中，CHO触发事件类型包括例如事件A3、事件A4、事件A5、事件B1、事件B2或其他触发事件类型等。候选小区的相关信息包括以下信息中的至少一种：候选小区的小区标识(例如小区全球标识(cell global identifier，CGI)和/或物理小区标识(physical cell identifier，PCI))、候选小区对应的频率信息(例如，同步信号块(synchronization signal block，SSB)的绝对频率、参考资源模块的绝对频率位置、频率带宽列表、子载波间隔(subcarrier spacing，SCS)特定的载波列表)、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)、接入候选小区所需的随机接入信道(random access channel，RACH)资源信息等。可选地，候选小区的相关信息还可以包括候选小区对应的资源信息(例如，物理层配置参数、介质访问控制(media access control，MAC)层配置参数、无线链路控制(radio link control，RLC)层配置参数、分组数据汇聚层协议(packet data convergence protocol，PDCP)层配置参数、业务数据适配协议(service data adaptation protocol，SDAP)层配置参数、无线资源控制(radio resource control，RRC)层配置参数等)。
示例性的，若配置的CHO触发事件类型是事件A3(也可称为A3事件)，配置的对应的门限值为第一阈值(例如，为补偿(offset)dB)，则当某候选小区的小区信号质量高于服务小区的小区信号质量第一阈值时，终端设备可以确定该候选小区满足CHO触发条件。若配置的CHO触发事件类型是事件A5(也可称为A5事件)，配置的对应的门限值为第二阈值、第三阈值，则当某候选小区的小区信号质量高于第二阈值，且服务小区的小区信号质量低于第三阈值时，终端设备可以确定该候选小区满足CHO触发条件。
应理解，可以采用其他的定义方式来定义CHO触发事件类型和CHO触发条件是否满足，本实施例对此不做限定。
网络设备可以为终端设备配置一个或多个候选小区，该第一CHO配置信息可以包括该一个或多个候选小区各自对应的CHO配置信息。每个候选小区对应的CHO配置信息可以包括该候选小区对应的CHO触发条件和该候选小区对应的相关信息(例如该候选小区 的小区标识、该候选小区对应的频率信息、该候选小区为终端设备分配的C-RNTI、接入该候选小区所需的随机接入信道RACH资源信息等)。该一个或多个候选小区分别对应的CHO触发条件可以相同，也可以不同，换句话说，不同的候选小区可以对应同一个CHO触发条件，也可以对应不同的CHO触发条件。
可选地，尝试接入第一目标小区的过程包括：终端设备向第一目标小区发送前导码之前；和/或，在终端设备向第一目标小区发送前导码之后至终端设备接收随机接入响应(random access response，RAR)之前；和/或，在终端设备接收RAR之后至终端设备向第一目标小区发送无线资源控制(radio resource control，RRC)重配置完成消息之前；和/或，在终端设备向第一目标小区发送前导码之后至终端设备向第一目标小区发送RRC重配置完成消息之前。或者，可选地，尝试接入第一目标小区的过程包括：终端设备向第一目标小区发送RRC重配置完成消息之前。应理解，尝试接入第一目标小区的过程可以理解为终端设备在确定出要切换至的第一目标小区后，为了切换至该第一目标小区所需要完成的流程。
需要说明的是，终端设备根据第二CHO配置信息确定是否继续切换至第一目标小区，也可以理解为终端设备根据第二CHO配置信息确定是否继续接入第一目标小区，或者终端设备根据第二CHO配置信息确定是否继续与第一目标小区进行随机接入过程。在终端设备确定出第一目标小区后但不需要执行与第一目标小区的随机接入流程的情况下，终端设备根据第二CHO配置信息确定是否继续切换至第一目标小区，也可以理解为终端设备根据第二CHO配置信息确定是否向第一目标小区发送RRC重配置完成消息。
结合第一方面，在一种可能的实现方式中，所述根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区，包括：根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数未发生变化，确定继续切换至所述第一目标小区。
终端设备确定第一目标小区对应的CHO配置参数未发生变化时，可以认为第一目标小区仍然满足CHO触发条件，该第一目标小区仍然是适合终端设备切换至的目标小区，因此，终端设备可以继续切换至该第一目标小区，避免终端设备重新进行目标小区的确定、重新尝试接入满足CHO触发条件的目标小区等的流程，能够降低复杂度、节约终端设备的能耗，且使得终端设备与网络设备侧的理解/行为保持一致，提高条件切换的可靠性，保证系统性能。
结合第一方面，在一种可能的实现方式中，如果所述终端设备未能成功切换至所述第一目标小区时，所述方法还包括：根据所述第二CHO配置信息，或者根据所述第一CHO配置信息和所述第二CHO配置信息，确定所述终端设备准备切换至的第二目标小区。
当终端设备向第一目标小区发起的切换失败时，终端设备可以根据网络设备配置的CHO配置信息重新确定终端设备可以切换至的目标小区，从而使得终端设备能够切换至合适的目标小区，保证业务连续。
应理解，第二目标小区是终端设备与第一目标小区的切换流程失败后，又重新确定的尝试切换至的小区，该第二目标小区可以是网络设备为终端设备配置的候选小区中满足CHO触发条件的一个小区。第二目标小区与第一目标小区可以是同一个小区，也可以是不同的小区。
结合第一方面，在一种可能的实现方式中，所述根据所述第二CHO配置信息确定是 否继续切换至所述第一目标小区，包括：根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数发生变化时，根据所述第二CHO配置信息，或者，根据所述第一CHO配置信息和所述第二CHO配置信息，确定所述终端设备可以切换至的第三目标小区。
可选地，终端设备判断第一目标小区对应的CHO配置参数是否发生变化，包括：判断第一目标小区是否被删除，和/或，判断第一目标小区对应的CHO触发条件是否发生变化，和/或，判断第一目标小区的相关信息是否发生变化，其中第一目标小区的相关信息可以包括第一目标小区为终端设备分配的C-RNTI、接入第一目标小区所需的随机接入信道RACH资源、第一目标小区对应的资源信息(如物理层配置参数、介质访问控制(media access control，MAC)层配置参数、无线链路控制(radio link control，RLC)层配置参数、分组数据汇聚层协议(packet data convergence protocol，PDCP)层配置参数、业务数据适配协议(service data adaptation protocol，SDAP)层配置参数、无线资源控制(radio resource control，RRC)层配置参数等)中的至少一种。
终端设备确定第一目标小区对应的CHO配置参数发生变化时，第一目标小区可能不再是适合终端设备切换至的小区，终端设备可以根据变化后的配置信息重新确定可以切换至的目标小区，避免终端设备切换至不合适的小区，或者，避免终端设备与第一目标小区的切换失败导致的业务中断，通过重新确定可以切换至的目标小区，能够提高条件切换的可靠性，提升切换成功率，保证系统性能。
应理解，第三目标小区是在第一目标小区对应的CHO配置参数发生变化时终端设备重新确定的准备切换至的小区，该第三目标小区可以是网络设备为终端设备配置的候选小区中满足CHO触发条件的一个小区。第三目标小区与第一目标小区可以是同一个小区，也可以是不同的小区。
可选地，所述第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，终端设备可以根据所述第二CHO配置信息，或者，可以根据所述第一CHO配置信息和所述第二CHO配置信息确定是否继续切换至第一目标小区。可选地，该第二CHO配置信息中可以包含指示信息，该指示信息用于指示该第二CHO配置信息是否是全配置信息，例如，该指示信息可以是二进制数值，如“0”表示该第二CHO配置信息不是全配置信息，“1”表示该第二CHO配置信息是全配置信息；或者，该指示信息可以是布尔值，如“FALSE”表示该第二CHO配置信息不是全配置信息，“TRUE”表示该第二CHO配置信息是全配置信息；或者，该指示信息有其他表示方式，本申请实施例对此不做限定。
应理解，如果所述第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，可以理解为，所述第二CHO配置信息与所述第一CHO配置信息相互解耦，没有关联关系。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息为网络设备向终端设备发送的CHO全配置信息时，终端设备可以根据第二CHO配置信息中是否包括第一目标小区的小区标识(例如CGI和/或PCI)、第一目标小区对应的索引或第一目标小区对应的测量信息(例如测量频点或测量标识)或其他可以用来标识第一目标小区的信息，来确定第一目标小区对应的配置参数是否发生变化。可选地，若第二CHO配置信息中不包括第一目标小区的小区标识、第一目标小区对应的索引或第一目标小区对应的测量信息等，终端设备可以认为网络设备此次为终端设备配置的候选小区中不包括第一目标小区， 进而可以认为第一目标小区可能不再是适合终端设备切换至的小区，因此终端设备确定不再继续切换至第一目标小区。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息为网络设备向终端设备发送的CHO全配置信息时，终端设备可以结合第一CHO配置信息以及第二CHO配置信息来进行判断，例如，通过对比第一CHO配置信息以及第二CHO配置信息来判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化。可选地，终端设备通过对比第一CHO配置信息和第二CHO配置信息判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化，包括：判断第一目标小区是否被删除，和/或，判断第一目标小区对应的CHO触发条件是否发生变化，和/或，判断第一目标小区的相关信息是否发生变化，其中第一目标小区的相关信息可以包括第一目标小区为终端设备分配的C-RNTI、接入第一目标小区所需的随机接入信道RACH资源、第一目标小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等。通过对比第一CHO配置信息和第二CHO配置信息，终端设备一旦发现对应第一目标小区的任意一项参数发生变化，则，终端设备确定不再继续切换至第一目标小区，终端设备根据第二CHO配置信息进行后续操作，例如，根据第二CHO配置信息进行CHO触发条件是否满足的判断，进而，确定可以切换至的目标小区并尝试接入。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，终端设备根据所述第二CHO配置信息确定是否继续切换至第一目标小区。
可选地，终端设备接收到第二CHO配置信息后，确定不继续切换至第一目标小区，根据第二CHO配置信息重新确定终端设备可以切换至的小区。也就是说，终端设备接收到第二CHO配置信息之后，第一CHO配置信息不再生效，即，终端设备删除第一CHO配置信息，存储第二CHO配置信息，后续操作中，终端设备使用/遵循第二CHO配置信息。具体的，终端设备接收到第二CHO配置信息后，停止切换至第一目标小区；终端设备根据第二CHO配置信息进行CHO触发条件是否满足的判断，进而，确定可以切换至的目标小区并尝试接入。
应理解，终端设备确定不继续切换至第一目标小区，是指终端设备此次不继续切换至第一目标小区。在一些可能的实现方式中，若终端设备根据第二CHO配置信息重新确定可以切换至的小区仍为第一目标小区，则终端设备在新的切换流程中仍执行切换至第一目标小区的操作。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息是在所述第一CHO配置信息的基础上，用于对通过所述第一CHO配置信息配置过的候选小区进行更改的信息(可以将这种实现方式称为delta配置方式)。可选地，该第二CHO配置信息中可以包含指示信息，该指示信息用于指示该第二CHO配置信息是否是delta配置信息，例如，该指示信息可以是二进制数值，如“0”表示该第二CHO配置信息是delta配置信息，“1”表示该第二CHO配置信息不是delta配置信息；或者，该指示信息可以是布尔值，如“FALSE”表示该第二CHO配置信息不是delta配置信息，“TRUE”表示该第二CHO配置信息是delta配置信息；或者，该指示信息有其他表示方式，本申请实施例对此不做 限定。应理解，在这种实现方式中，所述第二CHO配置信息与所述第一CHO配置信息之间可以存在关联关系。终端设备可以根据所述第一CHO配置信息和所述第二CHO配置信息确定是否继续切换至所述第一目标小区。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息是在所述第一CHO配置信息的基础上，用于对通过所述第一CHO配置信息配置过的候选小区进行更改的信息时，终端设备可以根据第二CHO配置信息中是否包括第一目标小区的小区标识(例如CGI和/或PCI)、第一目标小区对应的索引、第一目标小区对应的测量信息(例如测量频点或测量标识)或者其他用于标识第一目标小区的信息来确定第一目标小区对应的配置参数是否发生变化。可选地，若第二CHO配置信息中包括第一目标小区的小区标识、第一目标小区对应的索引或第一目标小区对应的测量信息，终端设备可以认为网络设备对第一目标小区对应的CHO配置信息进行了更改(例如修改或删除)，则终端设备可以确定第一目标小区对应的配置参数发生了变化。
结合第一方面，在一种可能的实现方式中，所述第二CHO配置信息是在所述第一CHO配置信息的基础上，用于对通过所述第一CHO配置信息配置过的候选小区进行更改的信息时，终端设备可以结合第一CHO配置信息以及第二CHO配置信息来进行判断，例如，通过对比第一CHO配置信息以及第二CHO配置信息来判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化。可选地，终端设备通过对比第一CHO配置信息和第二CHO配置信息判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化，包括：判断第一目标小区是否被删除，和/或，判断第一目标小区对应的CHO触发条件是否发生变化，和/或，判断第一目标小区的相关信息是否发生变化，其中第一目标小区的相关信息可以包括第一目标小区为终端设备分配的C-RNTI、接入第一目标小区所需的随机接入信道RACH资源、第一目标小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等。通过对比第一CHO配置信息和第二CHO配置信息，终端设备一旦发现对应第一目标小区的任意一项参数发生变化，则，终端设备确定不再继续切换至第一目标小区，终端设备根据第一CHO配置信息和第二CHO配置信息，进行后续操作，例如，终端设备根据第一CHO配置信息和第二CHO配置信息，更新CHO配置信息，并可以存储更新后的CHO配置信息，进一步地，终端设备根据更新后的CHO配置信息进行目标小区的确定并尝试接入。
应理解，本申请实施例中，第二CHO配置信息可以用于进行新的候选小区的添加，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)的配置参数进行修改，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)进行删除。
结合第一方面，在一种可能的实现方式中，所述第一CHO配置信息和/或所述第二CHO配置信息承载于无线资源控制RRC消息中。
可选地，RRC消息可以是现有的RRC消息例如RRC重配置消息，或者是新定义的RRC消息。
第二方面，提供一种终端设备，包括用于执行第一方面或第一方面中任一种可能实现方式中所描述的方法/操作/步骤/动作所一一对应的模块或单元，该模块或单元可以是硬件 电路，也可是软件，也可以是硬件电路结合软件实现。
第三方面，提供一种通信装置，用于实现上述第一方面及其任意一种可能的实现方式中的方法。该通信装置可以为上述方法设计中的终端设备，或者为设置在终端设备中的芯片。一种可能的方式中,该通信装置包括：处理器，与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面及其任意一种可能的实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
当该通信装置为终端设备时，该通信接口可以是收发器，或，输入/输出接口。
当该通信装置为配置于终端设备中的芯片时，该通信接口可以是输入/输出接口。
第四方面，提供一种通信装置，所述通信装置包括：收发器、处理器和存储器。该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该通信装置执行第一方面或第一方面中任一种可能实现方式中的方法。
第五方面，提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当所述指令在计算机上运行时，使得计算机执行第一方面或第一方面的任一种可能的实现方式所述的方法。
第六方面，提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，使得计算机执行第一方面或第一方面的任一种可能的实现方式所述的方法。
第七方面，提供一种通信系统，包括网络设备和前文所述的终端设备。
附图说明
图1是本申请实施例的应用场景的示意图；
图2是本申请实施例的切换流程示意性流程图；
图3是本申请一个实施例的切换方法的示意性流程图；
图4是本申请另一个实施例的切换方法的示意性流程图；
图5是本申请一个实施例提供的通信装置的示意性结构图；
图6是本申请一个实施例提供的装置的示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，包括但不限于长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)系统或新无线(new radio，NR)系统以及未来的第六代通信系统等。
还应理解，本申请实施例的技术方案在通信系统中应用时，可以应用于各种接入技术。例如，可以应用于正交多址接入(orthogonal multiple access，OMA)技术或非正交多址接入(non-orthogonal multiple access，NOMA)技术。应用于正交多址接入技术时，可以应用于正交频分多址(orthogonal frequency division multiple access，OFDMA)或单载波频分 多址(single carrier frequency division multiple access，SC-FDMA)等技术，本申请实施例不做限定。应用于非正交多址接入技术时，可以应用于稀疏码多址接入(sparse code multiple access，SCMA)、多用户共享接入(multi-user shared access，MUSA)、图样分割多址接入(pattern division multiple access，PDMA)、交织格栅多址接入(interleave-grid multiple access，IGMA)、资源扩展多址接入(resource spreading multiple access，RSMA)、非正交编码多址接入(non-orthogonal coded multiple access，NCMA)或非正交编码接入(non-orthogonal coded access，NOCA)等技术，本申请实施例对此不做任何限定。
图1示出了本申请实施例的应用场景的示意图。如图1所示，该应用场景中可以包括网络设备110和终端设备120。
本申请实施例中的网络设备110可以是用于与终端设备120通信的设备，例如网络设备110可以是用于将终端设备120接入无线接入网络(radio access network，RAN)的基站。为方便理解，本申请实施例以网络设备110为基站为例进行说明。基站有时也可称为接入网设备或接入网节点。可以理解的是，采用不同无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同。为方便描述，本申请实施例将为终端设备提供无线通信接入功能的装置统称为基站。例如网络设备110可以是长期演进(long term evolution，LTE)中的演进型节点B(evolved node B，eNB或eNodeB)，也可以是第五代移动通信(the fifth generation，5G)系统中的下一代基站节点(next generation node basestation，gNB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，也可以是传输接收点(transmission and reception point，TRP)，还可以是5G系统或未来移动通信系统中的集中单元(centralized unit，CU)或分布单元(distributed unit，DU)，其中CU与DC可以集成在同一个物理设备中，也可以部署于分离的设备中。CU实现gNB的部分功能，DU实现gNB的部分功能，例如，CU负责处理非实时协议和服务，实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能；DU负责处理物理层协议和实时服务，实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。或者该网络设备110可以为中继站、接入点、车载设备、可穿戴设备以及5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，本申请实施例并不限定。网络设备110可以是宏基站，也可以是微基站。网络设备110的覆盖范围内可以包括一个小区，也可以包括多个小区。
本申请实施例中的终端设备120，可以经接入网设备与一个或多个核心网(core network，CN)进行通信。终端设备120可以是一种具有无线收发功能的设备，终端设备120可以被部署在陆地上，包括室内或室外、手持或车载；也可以被部署在水面上(如轮船等)；还可以被部署在空中(例如飞机、气球和卫星上等)。终端设备120也可以称为用户设备(user equipment，UE)、接入终端、终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、无线网络设备、用户代理或用户装置。终端设备120可以是蜂窝电话(cellular phone)、无绳电话、会话启动协议(session initiation protocol，SIP)电话、智能电话(smart phone)、无线本地环路(wireless localloop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它设备、车载设备、可穿戴设备、无人机设备或物联 网、车联网中的终端以及未来网络中的任意形态的终端、中继用户设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端等。本申请实施例对此并不限定。为方便描述，在本申请一些实施例中，以终端设备120为UE为例进行说明。
网络设备110与终端设备120可以通过二者之间的传输链路(或称通信链路)进行上下行信号的传输，其中，网络设备110到终端设备120的传输链路可以称为下行链路(downlink)，终端设备120到网络设备110的传输链路可以称为上行链路(uplink)。
当终端设备处于连接状态时，会从一个小区移动到另一个小区，原来的服务小区不能再给终端设备继续提供服务或者为终端设备提供的服务质量较差，为了不中断业务，需要将终端设备切换到更合适的小区，继续为终端设备提供服务，实现移动性管理。其中原来的服务小区可以称为源小区，为终端设备提供继续服务的小区可以称为目标小区，终端设备从源小区切换至目标小区的过程就是切换。源小区和目标小区可以位于同一网络设备的覆盖范围内，也可以位于不同网络设备的覆盖范围内。以网络设备为基站为例，具体而言，源小区和目标小区可以属于同一基站，也可以属于不同基站，本申请实施例中源小区所属的基站可以称为源基站，相应地，源小区所属的网络设备可以称为源网络设备，目标小区所属的基站可以称为目标基站，相应地，目标小区所属的网络设备可以称为目标网络设备。当源小区和目标小区属于同一基站时，源基站和目标基站相同，此时终端设备是在同一基站内的不同小区之间进行的切换，在一些实施例中也可以称为站内切换。当源小区和目标小区属于不同基站时，终端设备从源小区切换至目标小区的过程可以认为是在不同基站间进行的切换，在一些实施例中也可以称为站间切换。
在传统的切换流程中，连接态的终端设备(例如连接态UE)的移动性管理通常是由网络设备控制的，即网络设备通过发送切换消息来指示终端设备切换到哪个小区以及如何进行切换。以图1为例，终端设备120在网络设备110管理的源小区的覆盖范围内，当终端设备120需要进行切换时，网络设备110可以向终端设备120发送切换消息以控制终端设备120从源小区切换到目标小区。网络设备110给终端设备120发送的切换消息可以是无线资源控制(radio resource control，RRC)消息。示例性的，在NR系统中，该RRC消息(即切换消息)可以是携带同步重配置信元(reconfiguration with sync)的RRC重配置消息；在LTE系统中，该RRC消息(即切换消息)可以是携带移动性控制信息信元(mobility control info)的RRC连接重配置消息。网络设备110给终端设备120发送的切换消息中包括目标小区的相关信息以及终端设备120接入该目标小区所需的相关的配置参数。示例性的，切换消息中可以包括目标小区的相关信息例如目标小区的物理小区标识(physical cell identifier，PCI)和目标小区对应的频率信息，目标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)，终端设备接入目标小区所需的随机接入信道(random access channel，RACH)资源信息，其中，RACH资源信息可以包括专用RACH资源信息和/或公共RACH资源信息，以及其他相关信息等。其中目标小区对应的频率信息可以包括目标小区对应的频点，示例性的，在NR系统中，目标小区对应的频率信息所包含的内容可参考协议TS38331-f51中的具体描述，在此不再赘述。终端设备120在接收到网络设备110发送的切换消息后，可以根据切换消息中包含的信息接入目标小区。因此，切换消息的成功发送是保证终端设备在传统切换机制下成功切换的必要条件。然而，在某些通信场景(尤其是高频场景)中，信道质量的快速衰减、终端设备的快 速移动、物体的遮挡，或者测量、切换准备的持续时间较长等都会导致切换消息发送失败，进而导致无线链路失败或者切换失败，降低切换成功率。
为解决上述切换消息可能发送失败而导致终端设备切换失败的问题，可以采用条件切换(conditional handover，CHO)机制来提升切换成功率。CHO机制是基于CHO触发条件(或者CHO执行条件)进行的切换，网络设备可以在通信链路质量较好时通知终端设备一个或多个候选小区的配置信息及相对应的CHO触发条件，终端设备可以将满足CHO触发条件的候选小区作为目标小区，进而，终端设备可以在确定出目标小区后，从源小区切换至确定出的目标小区，而无需像在传统切换机制中一样由网络设备发送切换消息来通知终端设备要切换至的小区。网络设备可以为终端设备配置一个候选小区或多个候选小区，当网络设备为终端设备配置一个候选小区时，该一个候选小区与源小区可以属于同一基站或不同基站；当网络设备为终端设备配置多个候选小区时，该多个候选小区与源小区可属于同一基站或不同基站，该多个候选小区也可以属于同一基站或不同基站。应理解，本申请实施例中候选小区所属的基站可以称为候选基站，相应地，候选小区所属的网络设备可以称为候选网络设备。
为方便理解，下面结合图2描述终端设备基于CHO机制的切换流程。但应理解，图2所示的CHO流程仅仅是示例性的，其中有的步骤可以不执行，或者在CHO流程中还有其他的步骤被执行但在图2中并未示出。图2所示的CHO流程中，各个步骤之间的逻辑顺序可以调整，本申请实施例对此不做具体限定。
在步骤S210，源网络设备向终端设备发送CHO配置信息。
可选的，源网络设备可以在源链路质量较好时向终端设备发送CHO配置信息。应理解，源链路即源网络设备与终端设备之间的通信链路，包括上行链路和下行链路。
该CHO配置信息可以包括CHO触发条件(或CHO执行条件)、一个或多个候选小区的信息等，其中多个候选小区的CHO触发条件可以相同，也可以不同。候选小区的信息可以包括以下信息中的至少一项：候选小区的小区全球标识(cell global identifier，CGI)、候选小区的物理小区标识(physical cell identifier，PCI)、候选小区对应的频率信息、候选小区为终端设备分配的C-RNTI、接入候选小区所需的随机接入信道RACH资源信息等。其中，候选小区对应的频率信息可以包括同步信号块(synchronization signal block，SSB)的绝对频率(absolute frequency)(例如absolute frequency SSB)、参考资源模块(common resource block，common RB0)的绝对频率位置(absolute frequency point)(例如absolute frequency pointA)、频率带宽列表(frequency band list)、子载波间隔(subcarrier spacing，SCS)特定的载波列表(specific carrier list)(例如scs-specific carrier list)等中的一项或多项；接入候选小区所需的随机接入信道RACH资源信息可以包括专用RACH资源信息和/或公共RACH资源信息。可选的，候选小区的信息还可以包括候选小区对应的资源信息(如物理层配置参数、介质访问控制(media access control，MAC)层配置参数、无线链路控制(radio link control，RLC)层配置参数、分组数据汇聚层协议(packet data convergence protocol，PDCP)层配置参数、业务数据适配协议(service data adaptation protocol，SDAP)层配置参数、无线资源控制(radio resource control，RRC)层配置参数等)。
需要说明的是，当网络设备为终端设备配置多个候选小区时，对于该多个候选小区中 的每个候选小区而言，网络设备可以为终端设备配置每个候选小区各自对应的CHO配置信息。换句话说，在步骤S210中，源网络设备向终端设备发送的CHO配置信息包括多个候选小区中的每个候选小区所对应的CHO配置信息。每个候选小区对应的CHO配置信息可以包括该候选小区对应的CHO触发条件(或CHO执行条件)和该候选小区的信息，该候选小区的信息可以包括以下信息中的至少一种：该候选小区的CGI、PCI、该候选小区对应的频率信息、该候选小区为终端设备分配的C-RNTI、接入该候选小区所需的RACH资源信息、该候选小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等。其中，每个候选小区各自对应的CHO触发条件可以相同或不同。本申请实施例对此不做限定。可以理解的，在网络设备为终端设备配置的多个候选小区对应的CHO触发条件相同的情况下，网络设备可以为多个候选小区配置一个共用CHO触发条件，无需为每个候选小区均配置对应的CHO触发条件。例如：在网络设备为终端设备配置的多个候选小区对应的CHO触发条件相同的情况下，网络设备向终端设备发送的CHO配置信息中可以包括多个候选小区的信息和一个共用CHO触发条件，终端设备接收到网络设备发送的该CHO配置信息后，确定该CHO配置信息中包括的多个候选小区，共用该CHO配置信息中包括的一个CHO触发条件，即该CHO配置信息中包括的多个候选小区均对应该CHO配置中包括的一个CHO触发条件。
S210中的CHO配置信息可以包含在RRC消息中，或其他消息中，本申请实施例对此不做限定。
在步骤S220，终端设备接收CHO配置信息后，终端设备可以根据该CHO配置信息判断CHO触发条件(或CHO执行条件)是否满足，确定目标小区。
在该步骤中，终端设备可以根据该CHO配置信息判断配置的候选小区是否满足CHO触发条件，从而将满足CHO触发条件的某个候选小区作为目标小区。如果存在多个满足CHO触发条件的候选小区，终端设备可以按照某一规则从该多个满足CHO触发条件的候选小区中选择一个小区作为目标小区，例如，将满足CHO触发条件的多个候选小区中的小区信号质量最高的小区确定为目标小区，或者，将满足CHO触发条件的多个候选小区中的优先级最高(如频率优先级最高)的小区确定为目标小区，或者将是满足CHO触发条件的多个候选小区中拥有最多优良波束(优良波束指的是波束的信号质量高于某预定门限值，该预定门限值可以包含在第一消息中，或者是协议约定的，本申请不做限定)的小区确定为目标小区，或者是将满足CHO触发条件的多个候选小区中的任一小区确定为目标小区，或者通过其他方式确定目标小区，或者留给终端设备实现，本申请实施例对此不做限定。
可选地，终端设备在判断CHO触发条件是否满足时，可以基于无线资源管理(radio resource management，RRM)测量得到的小区信号质量(例如参考信号接收功率(reference signal received power，RSRP)和/或参考信号接收质量(reference signal received quality，RSRQ))进行判断。示例性的，网络设备为终端设备配置的候选小区中包括候选小区#1，对应候选小区#1，网络设备配置的CHO触发事件类型是A3事件且配置的相对应的门限值为补偿值(offset)，则当候选小区#1的小区信号质量比服务小区(即源小区)的小区信号质量高出offset时，则认为候选小区#1满足CHO触发条件，终端设备可以将该候选 小区#1确定为目标小区，即终端设备可以从服务小区切换到该候选小区#1。再例如，除了候选小区#1，网络设备为终端设备配置的候选小区中还包括候选小区#2，对应候选小区#2，网络设备配置的CHO触发事件类型是A5事件且配置的相对应的门限值为J、K，则当候选小区#2的小区信号质量高于K且服务小区(即源小区)的小区信号质量低于J时，则认为候选小区#2满足CHO触发条件，终端设备可以将该候选小区#2确定为目标小区，即终端设备可以从服务小区切换到该候选小区#2。
应理解，网络设备为候选小区配置的CHO触发事件类型可以根据实际需要确定，候选小区满足与CHO触发事件类型对应的CHO触发条件，即认为该候选小区可以被确定为目标小区。
可选地，在步骤S220之后，终端设备可以与确定出来的目标小区进行随机接入RACH过程。例如目标小区与源小区属于不同的网络设备，则在该步骤220之后终端设备将与目标小区所属的网络设备即目标网络设备(例如图2中的候选网络设备#1)进行RACH过程。若目标小区与源小区均属于同一网络设备，终端设备可以不需要与目标小区(或目标网络设备，即源网络设备)进行RACH过程。
当随机接入过程完成，终端设备可以给目标小区所属的目标网络设备发送指示CHO完成的消息，例如RRC消息，示例性的该RRC消息可以为RRC重配置完成消息，用于通知目标网络设备条件切换完成，终端设备已经成功切换至目标小区。当目标小区和源小区属于同一网络设备时，目标网络设备即为源网络设备，则终端设备通知源网络设备条件切换完成。
至此，UE成功从源小区切换至目标小区。由于在CHO机制中，源网络设备在源链路通信质量较好的情况下向终端设备发送条件切换的配置信息(即CHO配置信息)，保证了CHO配置信息的发送成功率，进而终端设备根据该CHO配置信息选择目标小区并进行切换，提高了切换的成功率。
在步骤S210之前，源网络设备与终端设备可以执行测量流程，例如图2所示的步骤S201和步骤S202。
在步骤S201，源网络设备在RRC重配置消息中给终端设备发送测量配置。
在步骤S202，终端设备接收测量配置后对测量对象进行测量，当评估出测量结果满足上报触发条件后，终端设备向源网络设备发送相应的测量报告。源网络设备根据终端设备上报的测量报告进行CHO的切换准备流程，例如，源网络设备根据测量报告确定出候选小区后，源网络设备与候选小区所属的候选网络设备进行切换准备。
可选地，若源网络设备确定出的候选小区与源小区属于不同的网络设备，则源网络设备与候选网络设备之间进行信令交互。
示例性的，如图2所示，源网络设备确定出的候选小区包括候选小区#1和候选小区#2，候选小区#1属于候选网络设备#1，候选小区#2属于候选网络设备#2。在步骤S203a和步骤S203b，源网络设备分别向候选网络设备#1和候选网络设备#2发送请求消息，用于请求候选网络设备#1、候选网络设备#2为条件切换做准备，该请求消息可以是切换请求消息，或其他消息，本申请实施例不做限定。在步骤S204a和步骤S204b，候选网络设备#1和候选网络设备#2分别向源网络设备发送请求确认消息，该请求确认消息可以是切换请求确认消息，或其他消息，本申请实施例不做限定。该请求确认消息中可以包含候选 小区的信息，例如，S204a中的请求确认消息可以包含候选小区#1的信息，S204b中的请求确认消息可以包含候选小区#2的信息，具体的，候选小区的信息所包含的内容，可以参照步骤S210，在此不再赘述。应理解，图2中仅以两个候选网络设备、每个候选网络设备包括一个候选小区为例进行示例性的说明，在其他实施例中，源网络设备可以与多个候选网络设备进行信令交互，每个候选网络设备也可以包括多个候选小区；或者，源网络设备可以与同一个候选网络设备进行多次信令交互。若候选小区与源小区同属于源网络设备，则源网络设备可以为候选小区进行切换准备(例如，进行准纳控制、资源分配)，即条件切换的切换准备过程可以不执行(例如，切换请求、切换请求确认可以省略)。
上文提到，源网络设备可以与一个或多个候选小区进行条件切换的切换准备，源网络设备向终端设备发送的CHO配置信息中可以包括该一个或多个候选小区对应的CHO配置信息。该一个或多个候选小区各自对应的CHO配置信息可能是会发生变化的，在CHO机制中，源网络设备可以保持与终端设备的无线资源控制RRC连接和数据传输，直至终端设备成功切换至某个小区。网络设备(如源网络设备或目标网络设备)可以发送CHO全配置信息以替换之前发送过的CHO配置信息，例如，网络设备可以为终端设备重新配置候选小区；或者，网络设备在之前发送过的CHO配置信息基础上对已经配置过的候选小区进行添加、修改或删除等操作，例如网络设备可以为终端设备配置新的候选小区、删除之前配置的某个候选小区、修改已配置的候选小区对应的CHO配置信息等。换句话说，网络设备可以为终端设备提供新的候选小区对应的CHO配置信息、可以修改已配置的候选小区对应的CHO配置信息、可以删除已配置的候选小区对应的CHO配置信息、也可以向终端设备发送重新配置的候选小区对应的CHO配置信息等。
具体的，在一种实现方式中，源网络设备决定配置新的候选小区、或删除之前配置的某个候选小区、或修改已配置的候选小区对应的CHO配置信息或者为终端设备重新配置候选小区，即CHO配置信息的变化是源网络设备触发的；或者，在另一种实现方式中，候选网络设备决定配置新的候选小区、或删除之前配置的某个候选小区、或修改已配置的候选小区对应的CHO配置信息或者为终端设备重新配置候选小区，即CHO配置信息的变化是候选网络设备触发的，然后，候选网络设备将变化后的CHO配置信息通知源网络设备，接着，源网络设备将变化后的CHO配置信息发送给终端设备。上述两种实现方式中，源网络设备均可以将变化的CHO配置信息提供给终端设备，即源网络设备可以多次执行图2中的步骤S210。
一般情况下，终端设备根据网络设备发送的CHO配置信息(如第一CHO配置信息)确定目标小区后，即可以与目标小区所属的网络设备进行随机接入流程，随机接入成功后，即可以认为终端设备已经从源小区成功切换至目标小区。但在某些情况下，终端设备根据网络发送的CHO配置信息确定出目标小区后，在终端设备尝试接入到该目标小区的过程中，终端设备还可能再接收到网络设备后续发送的CHO配置信息(如第二CHO配置信息)，终端设备后续接收到的第二CHO配置信息，可能对第一CHO配置信息进行了更改(例如添加、修改、删除或完全替换)，目前现有技术中没有考虑在这种情形下终端设备如何进行处理。
本申请实施例提供一种方法，可以解决终端设备在尝试接入目标小区的过程中又接收到CHO配置信息的情况下，终端设备如何进行处理从而能够提高CHO的可靠性，保证系 统性能的问题。下面结合图3对本申请实施例进行详细描述。
图3示出了本申请实施例的切换方法的示意性流程图。图3的方法300可以由终端设备执行。该终端设备例如可以是图1所示终端设备120或者图2所示的终端设备。该方法300可以包括步骤S310至步骤S320。
在步骤S310，根据第一条件切换CHO配置信息确定第一目标小区。
该第一目标小区为终端设备准备切换至的小区。
网络设备可以为终端设备配置一个或多个候选小区，第一目标小区包含在该一个或多个候选小区中，该第一目标小区为该一个或多个候选小区中满足CHO触发条件的小区。
该第一CHO配置信息可以包括CHO触发条件和候选小区的相关信息。CHO触发条件可以包括CHO触发事件类型和相应的门限值，其中，CHO触发事件类型可以包括例如事件A3、事件A4、事件A5、事件B1、事件B2或其他触发事件类型等。候选小区的相关信息可以包括以下信息中的至少一种：候选小区的小区标识(例如CGI和/或PCI)、候选小区对应的频率信息(例如同步信号块SSB的绝对频率、参考资源模块的绝对频率位置、频率带宽列表、SCS特定的载波列表)、候选小区为终端设备分配的C-RNTI、接入候选小区所需的随机接入信道RACH资源信息等。可选地，候选小区的相关信息还可以包括候选小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)。
示例性的，若配置的CHO触发事件类型是事件A3(也可称为A3事件)，配置的对应的门限值为第一阈值(例如，为补偿(offset)dB)，则当某候选小区的小区信号质量高于服务小区的小区信号质量第一阈值时，终端设备可以确定该候选小区满足CHO触发条件。若配置的CHO触发事件类型是事件A5(也可称为A5事件)，配置的对应的门限值为第二阈值、第三阈值，则当某候选小区的小区信号质量高于第二阈值，且服务小区的小区信号质量低于第三阈值时，终端设备可以确定该候选小区满足CHO触发条件。
应理解，上述对于触发事件类型的说明仅仅是示例性的，在一些实施方式中还可以采用其他的定义方式来定义CHO触发事件类型和CHO触发条件是否满足，本申请实施例对此不做限定。
网络设备可以为终端设备配置一个或多个候选小区，该第一CHO配置信息可以包括该一个或多个候选小区各自对应的CHO配置信息。每个候选小区对应的CHO配置信息可以包括该候选小区对应的CHO触发条件和该候选小区对应的相关信息(例如该候选小区的小区标识、该候选小区对应的频率信息、该候选小区为终端设备分配的C-RNTI、接入该候选小区所需的随机接入信道RACH资源信息等)。可选地，该候选小区的相关信息还可以包括该候选小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)。该一个或多个候选小区分别对应的CHO触发条件可以相同，也可以不同，也就是说，不同的候选小区可以对应同一个CHO触发条件，也可以对应不同的CHO触发条件，本申请实施例不做具体限定。
该第一CHO配置信息可以包含在RRC消息中，或其他消息中，本申请实施例对此不做限定。
该第一目标小区与终端设备当前所在的服务小区可以属于同一网络设备，也可以属于 不同的网络设备。换句话说，以网络设备为基站为例，该第一目标小区与终端设备当前所在的服务小区(即源小区)可以属于同一基站，也可以属于不同基站。
在步骤S320，在尝试接入第一目标小区的过程中，如果接收到第二CHO配置信息，根据第二CHO配置信息确定是否继续切换至第一目标小区。
在尝试接入第一目标小区的过程中，可以包括在向第一目标小区发送前导码(preamble)之前，和/或在与第一目标小区进行随机接入RACH的过程中。示例性的，以在LTE系统或NR系统中为例，尝试接入第一目标小区的过程可以包括：终端设备向第一目标小区发送前导码之前；和/或，在终端设备向第一目标小区发送前导码之后至终端设备接收随机接入响应(random access response，RAR)之前；和/或，在终端设备接收RAR之后至终端设备向第一目标小区发送RRC重配置完成消息之前；和/或，在终端设备向第一目标小区发送前导码之后至终端设备向第一目标小区发送RRC重配置完成消息之前。或者，可选地，尝试接入第一目标小区的过程包括：终端设备向第一目标小区发送RRC重配置完成消息之前。应理解，尝试接入第一目标小区的过程可以理解为终端设备在确定出要切换至的第一目标小区后，为了切换至该第一目标小区所需要完成的流程。另外，尝试接入第一目标小区的过程包括终端设备向第一目标小区发送前导码之前，可以理解为终端设备根据第一CHO配置信息确定出了第一目标小区，正准备向第一目标小区发送前导码的过程属于终端设备尝试接入第一目标小区的过程。
本申请实施例提供的技术方案中，终端设备根据第一CHO配置信息确定第一目标小区，在终端设备尝试接入第一目标小区过程中，如果终端设备接收到第二CHO配置信息，终端设备可以根据第二CHO配置信息确定是否要继续接入已经确定出的第一目标小区，使得终端设备能够根据网络设备提供的CHO配置信息进行正确的处理，从而提高条件切换的可靠性，保证系统性能。
该第二CHO配置信息的形式有多种。
作为一个示例，该第二CHO配置信息可以是在第一CHO配置信息的基础上，用于对通过第一CHO配置信息配置过的候选小区进行更改的信息(可以将这种方式称为delta配置方式)。例如，基于第一CHO配置信息，第二CHO配置信息可以用于进行新的候选小区的添加，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)的配置参数进行修改，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)进行删除。示例性的，第二CHO配置信息用于添加新的候选小区(例如，第二CHO配置信息中包括新增候选小区对应的CHO触发条件和/或新增候选小区的相关信息等)，或者，第二CHO配置信息可以用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行配置信息的修改(例如，可以包括候选小区修改之后对应的CHO触发条件和/或候选小区修改之后对应的相关信息等)，或者，第二CHO配置信息还可以用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行删除(例如，包括删除已经配置过的该候选小区对应的CHO触发条件，和/或删除已经配置过的该候选小区的相关信息，和/或删除已经配置过的该候选小区对应的测量标识、测量频点等)。候选小区的相关信息参考上文描述，在此不再赘述。
相应的，终端设备可以根据接收到的第二CHO配置和第一CHO配置信息进行配置参 数的更改。例如，在第一CHO配置信息的基础上，如果第二CHO配置信息用于添加新的候选小区，则终端设备进行新的候选小区的添加，包括增加新的候选小区对应的CHO触发条件和/或增加新的候选小区的相关信息等；如果第二CHO配置信息用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行配置信息的修改，则终端设备可以将已配置过的候选小区对应的触发条件和/或已配置过的候选小区的相关信息修改成该已配置过的候选小区修改之后对应的CHO触发条件和/或修改之后对应的相关信息；如果第二CHO配置信息用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行删除，则终端设备可以删除已经配置过的该候选小区对应的CHO触发条件，和/或删除已经配置过的该候选小区的相关信息，和/或删除已经配置过的该候选小区对应的测量标识、测量频点等，即终端设备删除该候选小区，不再对该候选小区进行CHO触发条件是否满足的判断，更进一步的，终端设备不会切换至该候选小区。
应理解，该第二CHO配置信息是在第一CHO配置信息的基础上，用于对通过第一CHO配置信息配置过的候选小区进行更改的信息，也可以表述为第二CHO配置信息是第一CHO配置信息的delta配置信息，第二CHO配置信息与第一CHO配置信息之间可以存在关联关系。
作为另一个示例，该第二CHO配置信息可以是网络设备向终端设备发送的CHO全配置信息。也即该第二CHO配置信息与第一CHO配置信息相互独立、解耦，没有关联关系。相应地，终端设备可以以接收到的第二CHO配置信息完全替换掉之前接收到的第一CHO配置信息，并可以根据第二CHO配置信息执行条件切换流程；或者终端设备可以根据第二CHO配置信息和第一CHO配置信息执行条件切换流程。其中该第二CHO配置信息中所指示的网络设备为终端设备配置的候选小区与第一CHO配置信息中所指示的网络设备为终端设备配置的候选小区可以完全相同，可以部分相同，也可以完全不同。第二CHO配置信息中所指示的网络设备为终端设备配置的候选小区中可以包括第一目标小区，也可以不包括第一目标小区，本申请实施例不做具体限定。
该第二CHO配置信息可以包含在RRC消息中，或其他消息中，本申请实施例对此不做限定。可选地，包含第二CHO配置信息的RRC消息中可以包含用于指示该第二CHO配置信息是否是全配置信息的指示信息(如第一指示信息)，和/或，包含用于指示该第二CHO配置信息是否是delta配置信息的指示信息(如第二指示信息)。
例如，该第一指示信息可以是二进制数值，如“0”表示该第二CHO配置信息不是全配置信息，“1”表示该第二CHO配置信息是全配置信息；或者，该指示信息可以是布尔值，如“FALSE”表示该第二CHO配置信息不是全配置信息，“TRUE”表示该第二CHO配置信息是全配置信息；或者，该第一指示信息有其他表示方式，本申请实施例对此不做限定。类似地，第二指示信息可以是二进制数值，如“0”表示该第二CHO配置信息是delta配置信息，“1”表示该第二CHO配置信息不是delta配置信息；或者，该指示信息可以是布尔值，如“FALSE”表示该第二CHO配置信息不是delta配置信息，“TRUE”表示该第二CHO配置信息是delta配置信息；或者，该第二指示信息有其他表示方式，本申请实施例对此不做限定。
需要说明的是，在该步骤S320中，终端设备根据第二CHO配置信息确定是否继续切 换至第一目标小区，也可以理解为终端设备根据第二CHO配置信息来确定是否继续接入第一目标小区，或者确定是否继续与第一目标小区进行随机接入过程。在终端设备确定出第一目标小区后但不需要执行与第一目标小区的随机接入流程的情况下，终端设备根据第二CHO配置信息确定是否继续切换至第一目标小区，也可以理解为终端设备根据第二CHO配置信息确定是否向第一目标小区发送RRC重配置完成消息。
终端设备根据第二CHO配置信息，确定是否继续切换至第一目标小区的方式有多种。
作为一个示例，如果该第二CHO配置信息是在第一CHO配置信息的基础上，用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行更改(例如添加/修改/删除)的信息，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定是否继续切换至第一目标小区。例如，如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区未发生变化，具体的，例如，第一目标小区对应的CHO配置参数未发生变化，终端设备确定继续切换至第一目标小区。如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区发生变化，具体的，例如，第一目标小区对应的CHO配置参数发生变化，终端设备根据第一CHO配置信息和第二CHO配置信息确定终端设备准备切换至的第三目标小区。换句话说，如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区发生变化，例如，确定第一目标小区对应的CHO配置参数发生变化，终端设备确定不再继续切换至第一目标小区或者停止切换至第一目标小区或者停止与第一目标小区的随机接入过程。进一步地，终端设备可以根据最新的CHO配置信息，选择满足CHO配置信息的小区即第三目标小区，以尝试接入，其中，终端设备结合第一CHO配置信息和第二CHO配置信息来确定最新的CHO配置信息。可选地，第一目标小区对应的CHO配置参数可以包括以下至少一项：第一目标小区对应的CHO触发条件，第一目标小区为终端设备分配的C-RNTI、接入第一目标小区所需的随机接入信道RACH资源、第一目标小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等。
应理解，终端设备确定第一目标小区对应的CHO配置参数未发生变化时，可以认为第一目标小区仍然满足CHO触发条件，该第一目标小区仍然是适合终端设备切换至的目标小区，因此，终端设备可以继续切换至第一目标小区，避免终端设备重新进行目标小区的确定、重新尝试接入满足CHO触发条件的目标小区等的流程，从而降低复杂度、节约终端设备的能耗。终端设备确定第一目标小区对应的CHO配置参数发生变化时，第一目标小区可能不再是适合终端设备切换至的小区，终端设备可以根据变化后的最新的配置信息重新确定可以切换至的目标小区，避免终端设备切换至不合适的小区，或者，避免终端设备与第一目标小区的切换失败导致的业务中断，通过重新确定可以切换至的目标小区，从而提高条件切换的可靠性，提升切换成功率，保证系统性能。
进一步地，终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区对应的CHO配置参数是否发生变化可以有多种方式。
终端设备确定第一目标小区对应的CHO配置参数是否发生变化，可以包括：确定第一目标小区是否被删除，和/或，第一目标小区对应的CHO触发条件是否发生变化，和/或，第一目标小区的相关信息(例如，第一目标小区为终端设备分配的C-RNTI，和/或， 接入第一目标小区所需的随机接入信道RACH资源，和/或，第一目标小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等))是否发生变化。
例如，终端设备可以根据第二CHO配置信息中是否包括第一目标小区的小区标识(例如CGI和/或PCI)、第一目标小区对应的索引(例如，第一CHO配置信息中包含该第一目标小区对应的索引)、第一目标小区对应的测量信息(例如测量频点或测量标识)或者其他可以用来标识第一目标小区的信息，来确定第一目标小区的配置参数是否发生变化。
或者，例如，终端设备可以结合第一CHO配置信息以及第二CHO配置信息来进行判断，例如，通过对比第一CHO配置信息以及第二CHO配置信息来判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化。可选地，终端设备通过对比第一CHO配置信息和第二CHO配置信息判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化，包括：判断第一目标小区是否被删除，和/或，判断第一目标小区对应的CHO触发条件是否发生变化，和/或，判断第一目标小区的相关信息是否发生变化，其中第一目标小区的相关信息参考上文描述，不再赘述。通过对比第一CHO配置信息和第二CHO配置信息，终端设备一旦发现对应第一目标小区的任意一项参数发生变化，则，终端设备确定不再继续切换至第一目标小区，终端设备根据第一CHO配置信息和第二CHO配置信息，进行后续操作，例如，终端设备根据第一CHO配置信息和第二CHO配置信息，更新CHO配置信息，并可以存储更新后的CHO配置信息，进一步地，终端设备根据更新后的CHO配置信息进行目标小区的确定并尝试接入。
作为示例而非限定，若第二CHO配置信息中不包括第一目标小区的小区标识、第一目标小区对应的索引、第一目标小区对应的测量信息(例如测量频点或测量标识)、用来标识第一目标小区的信息以及与第一目标小区对应的参数信息等，终端设备可以确定第一目标小区的配置参数未发生变化，相应地，终端设备可以确定继续切换至第一目标小区。也就是说，第二CHO配置信息中不包括用于对第一目标小区或第一目标小区对应的配置参数进行增加/修改/删除的信息，终端设备可以认为第一目标小区仍然是适合终端设备切换至的小区，因此终端设备可以继续切换至第一目标小区。若第二CHO配置信息中包括第一目标小区的小区标识、第一目标小区对应的索引、第一目标小区对应的测量信息(例如测量频点或测量标识)、用于标识第一目标小区的信息以及与第一目标小区对应的参数信息中的任意一项或多项，终端设备可以确定第一目标小区的配置参数发生变化，相应地，终端设备可以确定不再继续切换至第一目标小区。也就是说，第二CHO配置信息中包括用于对第一目标小区或第一目标小区对应的配置参数进行增加/修改/删除的信息，终端设备可以认为第一目标小区可能不再是适合终端设备切换至的小区，因此终端设备确定不再继续切换至第一目标小区。
作为另一个示例，如果该第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定是否继续切换至第一目标小区。可选地，终端设备通过对比第一CHO配置信息和第二CHO配置信息判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化，包括：判断第一目标小区是否被删除，和/或，判断第一目标小区对应的CHO触发条件是否发生变化，和/或，判断第一目标小区的相关信息是否发生变化，其中第一目标小区的相关信息参考上文 描述，不再赘述。通过对比第一CHO配置信息和第二CHO配置信息，终端设备一旦发现对应第一目标小区的任意一项参数发生变化，则，终端设备确定不再继续切换至第一目标小区，终端设备根据第二CHO配置信息进行后续操作，例如，根据第二CHO配置信息进行CHO触发条件是否满足的判断，进而，确定可以切换至的目标小区并尝试接入。
例如，如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区未发生变化，具体的，例如，第一目标小区对应的CHO配置参数未发生变化，终端设备确定继续切换至第一目标小区。如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区发生变化，具体的，例如第一目标小区对应的CHO配置参数发生变化，终端设备根据第二CHO配置信息确定终端设备准备切换至的第三目标小区。如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定通过第二CHO配置信息配置的候选小区中不包括第一目标小区，具体的，例如第二CHO配置信息不包括第一目标小区对应的CHO配置参数，终端设备根据第二CHO配置信息确定终端设备准备切换至的第三目标小区。换句话说，如果终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区发生变化(例如，确定第一目标小区对应的CHO配置参数发生变化)或者确定网络设备通过第二CHO配置信息没有为终端设备配置第一目标小区为候选小区(例如，第二CHO配置信息不包括第一目标小区对应的CHO配置参数)，终端设备确定不再继续切换至第一目标小区或者停止切换至第一目标小区或者停止与第一目标小区的随机接入过程。进一步地，终端设备可以根据最新的CHO配置信息，选择满足CHO配置信息的小区即第三目标小区，以尝试接入，其中，终端设备接收到的第二CHO配置信息即为最新的CHO配置信息。
进一步地，终端设备根据第一CHO配置信息和第二CHO配置信息，确定第一目标小区对应的CHO配置参数是否发生变化可以有多种方式。
例如，终端设备可以根据第二CHO配置信息中是否包括第一目标小区的小区标识(例如CGI和/或PCI)、第一目标小区对应的索引或第一目标小区对应的测量信息(例如测量频点或测量标识)、用于标识第一目标小区的信息来确定第一目标小区的配置参数是否发生变化，或者终端设备可以根据第一CHO配置信息和第二CHO配置信息判断第一目标小区对应的CHO配置信息(例如配置参数)是否发生变化。
作为示例而非限定，若第二CHO配置信息中不包括第一目标小区的小区标识、第一目标小区对应的索引以及第一目标小区对应的测量信息(例如测量频点或测量标识)和用于标识第一目标小区的信息，终端设备可以确定网络设备通过第二CHO配置信息为终端设备配置的候选小区中不包括第一目标小区，相应地，终端设备可以确定不再继续切换至第一目标小区。也就是说，由于第二CHO配置信息是网络设备新发送的CHO全配置信息，若第二CHO配置信息中不包括已配置的第一目标小区对应CHO配置信息，终端设备可以认为网络设备此次没有为终端设备配置第一目标小区作为候选小区，进而可以认为第一目标小区可能不再是适合终端设备切换至的小区，因此终端设备确定不再继续切换至第一目标小区。
若第二CHO配置信息中包括第一目标小区的小区标识、第一目标小区对应的索引或第一目标小区对应的测量信息(例如测量频点或测量标识)或用于标识第一目标小区的信息中的一项或多项，且第二CHO配置信息中所包括的第一目标小区对应的其他的配置参 数与第一CHO配置信息中所包括的第一目标小区对应的其他的配置参数不同，终端设备可以确定网络设备通过第二CHO配置信息为终端设备配置的候选小区中包括第一目标小区，但第一目标小区的配置参数发生变化，相应地，终端设备可以确定不再继续切换至第一目标小区。也就是说，若第二CHO配置信息中包括已配置的第一目标小区对应的CHO配置信息，可以认为网络设备后续为终端设备配置的候选小区中仍然包括第一目标小区，但由于第一目标小区对应的配置参数发生变化，终端设备可以认为第一目标小区可能不再是适合终端设备切换至的小区，因此终端设备确定不再继续切换至第一目标小区。
若第二CHO配置信息中包括第一目标小区的小区标识、第一目标小区对应的索引以及第一目标小区对应的测量信息(例如测量频点或测量标识)、用于标识第一目标小区的信息中任意一项或多项，且第二CHO配置信息中所包括的第一目标小区对应的其他的配置参数与第一CHO配置信息中所包括的第一目标小区对应的其他的配置参数相同，终端设备可以确定网络设备通过第二CHO配置信息为终端设备配置的候选小区中包括第一目标小区，且第一目标小区的配置参数未发生变化，相应地，终端设备可以确定继续切换至第一目标小区。也就是说，若第二CHO配置信息中包括已配置的第一目标小区对应的CHO配置信息，可以认为网络设备后续为终端设备配置的候选小区中仍然包括第一目标小区，并且第一目标小区对应的配置参数未发生变化，终端设备可以认为第一目标小区仍然是适合终端设备切换至的小区，因此终端设备可以继续切换至第一目标小区。
再如，终端设备可以通过比较第二CHO配置信息中包含的一个或多个候选小区对应的CHO配置信息，以及第一CHO配置信息中包含的一个或多个候选小区对应的CHO配置信息(其中，CHO配置信息可以包括候选小区对应的CHO触发条件和/或候选小区对应的相关信息(例如，候选小区对应的相关信息参考上文描述，不再赘述)，确定第一目标小区是否发生变化。例如，通过比较来判断第一目标小区对应的CHO触发条件是否发生变化，和/或，第一目标小区对应的配置参数(例如，第一目标小区为终端设备分配的C-RNTI，和/或，接入第一目标小区所需的随机接入信道RACH资源，和/或第一目标小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等)是否发生变化，进而，确定第一目标小区是否发生变化。具体的，例如，第一目标小区对应的CHO触发条件发生变化，或者，第一目标小区对应的配置参数发生变化，则，可以确定第一目标小区发生变化。如果第一目标小区未发生变化，例如，第一目标小区的配置参数未发生变化，终端设备可以继续切换至第一目标小区。如果第一目标小区发生变化，例如第一目标小区的配置参数发生变化，终端设备可以不再继续切换至第一目标小区。
作为再一个示例，如果该第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，终端设备可以根据第二CHO配置信息确定是否继续切换至第一目标小区。进一步地：
一种方式，终端设备可以根据第二CHO配置信息中是否包括第一目标小区的小区标识(例如CGI和/或PCI)、第一目标小区对应的索引或第一目标小区对应的测量信息(例如测量频点或测量标识)或其他可以用来标识第一目标小区的信息，来确定第一目标小区对应的配置参数是否发生变化。可选地，若第二CHO配置信息中不包括第一目标小区的小区标识、第一目标小区对应的索引或第一目标小区对应的测量信息等，终端设备可以认 为网络设备此次为终端设备配置的候选小区中不包括第一目标小区，进而可以认为第一目标小区可能不再是适合终端设备切换至的小区，因此终端设备确定不再继续切换至第一目标小区。
或者，另一种方式，终端设备接收到第二CHO配置信息后，就可以确定不继续切换至第一目标小区，并将第二CHO配置信息完全替换掉第一CHO配置信息(例如存储第二CHO配置信息，并删除之前存储的第一CHO配置信息)，之后根据第二CHO配置信息确定终端设备准备切换至的小区。终端设备根据第二CHO配置信息确定出的准备切换至的小区(即第三目标小区)可能与第一目标小区为同一个小区，也可能是其他小区，不做限定。
又如，另一种方式，终端设备接收到第二CHO配置信息后，可以先继续进行切换至第一目标小区的流程，终端设备在与第一目标小区进行随机接入过程的同时(即终端设备确定出第一目标小区后但还未成功切换至第一目标小区之前)，可以根据第二CHO配置信息进行CHO触发条件是否满足的判断，例如，根据第二CHO配置信息中包含的CHO触发条件，和/或，第二CHO配置信息中包含的候选小区的信息，判断通过第二CHO配置信息配置的候选小区是否满足CHO触发条件，进而，确定是否继续切换至第一目标小区。具体的，终端设备在与第一目标小区进行随机接入过程的同时(即终端设备确定出第一目标小区后但还未成功切换至第一目标小区之前)，根据第二CHO配置信息，重新确定了终端设备可以切换至的小区(即第三目标小区)，若该小区与第一目标小区为同一个小区，则终端设备可以确定继续切换至第一目标小区，即，终端设备可以继续与第一目标小区正在进行的随机接入过程；若该小区不同于第一目标小区，则终端设备可以确定不再继续切换至第一目标小区，相应地，终端设备可以尝试去切换至终端设备根据第二CHO配置信息重新确定的该小区(即第三目标小区)。
本申请实施例中，终端设备接收到第二CHO配置信息后，可以先暂停切换至第一目标小区，在终端设备根据第二CHO配置信息，或者根据第一CHO配置信息和第二CHO配置信息确定第一目标小区是否发生变化后，再确定是否继续切换至第一目标小区。在其他一些实施例中，终端设备接收到第二CHO配置信息后，可以继续进行切换至第一目标小区的流程，在终端设备未成功切换至第一目标小区之前，终端设备根据第二CHO配置信息，或者根据第一CHO配置信息和第二CHO配置信息确定第一目标小区是否发生变化后，再确定是否继续切换至第一目标小区。终端设备根据第二CHO配置信息，或者根据第一CHO配置信息和第二CHO配置信息确定第一目标小区是否发生变化的方式可以参考上文描述，在此不再赘述。
当终端设备确定继续切换至第一目标小区后，终端设备可以继续与第一目标小区的随机接入流程，但在某些情况下例如有物遮挡、终端设备快速移动、第一目标小区的信道衰落快等情况，终端设备可能不能成功切换至第一目标小区。
可选地，如果所述终端设备未能成功切换至所述第一目标小区时，方法300还包括：根据第二CHO配置信息或者根据第一CHO配置信息和第二CHO配置信息，确定终端设备可以切换至的第二目标小区。
第二目标小区是终端设备与第一目标小区的切换流程失败后，又重新确定的尝试切换至的小区，该第二目标小区是网络设备为终端设备配置的候选小区中满足CHO触发条件 的一个小区。第二目标小区与第一目标小区可以相同，也可以不同。当终端设备向第一目标小区发起的切换失败时，终端设备可以根据网络设备配置的CHO配置信息重新确定终端设备可以切换至的第二目标小区，从而使得终端设备能够切换至合适的目标小区，保证业务连续。
终端设备确定第二目标小区的方式有多种。
作为一个示例，第二CHO配置信息是在第一CHO配置信息的基础上，用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行更改(例如添加/修改/删除)的信息，终端设备如果未能成功切换至第一目标小区，则，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定第二目标小区。具体地，第二CHO配置信息可以用于进行新的候选小区的添加，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)的配置参数进行修改，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)进行删除。
相应的，终端设备根据第一CHO配置信息和第二CHO配置信息，进行配置参数的更改。例如，在第一CHO配置信息的基础上，如果第二CHO配置信息用于添加新的候选小区，则终端设备进行新的候选小区的添加，包括增加新的候选小区对应的CHO触发条件和/或增加新的候选小区的相关信息等；如果第二CHO配置信息用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行配置信息的修改，则终端设备可以将已配置过的候选小区对应的触发条件和/或已配置过的候选小区的相关信息修改成该已配置过的候选小区修改之后对应的CHO触发条件和/或修改之后对应的相关信息；如果第二CHO配置信息用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行删除，则终端设备可以删除已经配置过的该候选小区对应的CHO触发条件和/或删除已经配置过的该候选小区的相关信息，和/或删除已经配置过的该候选小区对应的测量标识、测量频点等。换句话说，终端设备如果未能成功切换至第一目标小区，则，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定最新的CHO配置信息(即更新后的CHO配置信息)，终端设备根据最新的CHO配置信息确定第二目标小区。
作为另一个示例，该第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，由于第二CHO配置信息与第一CHO配置信息是解耦、独立的，终端设备如果未能成功切换至第一目标小区，则，终端设备可以根据第二CHO配置信息确定第二目标小区。终端设备可以根据第二CHO配置信息进行CHO触发条件是否满足的判断，例如，根据第二CHO配置信息中包含的CHO触发条件，和/或，第二CHO配置信息中包含的候选小区的信息，判断CHO触发条件是否满足，从通过第二CHO配置信息配置的候选小区中确定第二目标小区。
上文提到，如果第一目标小区发生变化，例如，第一目标小区对应的CHO配置参数发生变化时，终端设备可以根据第二CHO配置信息或者根据第一CHO配置信息和第二CHO配置信息确定终端设备可以切换至的第三目标小区。
第三目标小区是在第一目标小区对应的CHO配置参数发生变化时终端设备重新确定的准备切换至的小区，该第三目标小区可以是网络设备为终端设备配置的候选小区中满足CHO触发条件的一个小区。第三目标小区与第一目标小区可以相同，也可以不同。
终端设备确定第三目标小区的方式有多种。终端设备确定第三目标小区的方式与确定第二目标小区的方式相同，下面仅简要描述，详细内容可参考上文确定第二目标小区的描述。
作为一个示例，该第二CHO配置信息是在第一CHO配置信息的基础上，用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行更改(例如添加/修改/删除)的信息，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定第三目标小区。具体地，第二CHO配置信息可以用于进行新的候选小区的添加，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)的配置参数进行修改，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)进行删除。
相应的，终端设备根据第一CHO配置信息和第二CHO配置信息，进行配置参数的更改。换句话说，终端设备可以根据第一CHO配置信息和第二CHO配置信息确定最新的CHO配置信息(即更新后的CHO配置信息)，终端设备根据最新的CHO配置信息确定第三目标小区。
作为另一个示例，该第二CHO配置信息是网络设备向终端设备发送的CHO全配置信息，由于第二CHO配置信息与第一CHO配置信息是解耦、独立的，终端设备可以根据第二CHO配置信息确定第三目标小区。终端设备可以根据第二CHO配置信息进行CHO触发条件是否满足的判断，例如，根据第二CHO配置信息中包含的CHO触发条件，和/或，第二CHO配置信息中包含的候选小区的信息，判断CHO触发条件是否满足，从通过第二CHO配置信息配置的候选小区中确定第三目标小区。
可选地，第一CHO配置信息和/或第二CHO配置信息可以是承载于无线资源控制RRC消息中。换句话说，网络设备通过RRC消息向终端设备发送第一CHO配置信息和/或第二CHO配置信息。RRC消息可以是现有的RRC消息例如RRC重配置消息，也可以是新定义的RRC消息，本申请实施例不做具体限定。
下面结合图4，更加详细地描述本申请实施例的一些具体的非限制性的例子。图4中以源网络设备为源基站、终端设备为UE为例进行说明。该方法400可以包括步骤S410至步骤S450。
需要说明的是，为避免信令开销，CHO机制中，假定网络设备最多可以为终端设备配置的候选小区的个数为N，N为正整数。为方便理解，本申请实施例以N大于3、网络设备为终端设备首次配置两个候选小区(小区#1和小区#2)为例。应理解，网络设备为终端设备最终配置的候选小区的个数x应大于等于1且小于等于N。
在步骤S410，源基站向UE发送第一消息，该第一消息包括网络设备为终端设备配置的第一CHO配置信息，该第一CHO配置信息包括网络设备为终端设备配置的各个候选小区所对应的CHO配置信息。其中，候选小区所对应的CHO配置信息可以包括候选小区对应的CHO触发条件和/或候选小区对应的相关信息(例如，候选小区对应的相关信息包含该候选小区的小区标识、该候选小区对应的频率信息、该候选小区为终端设备分配的C-RNTI、接入该候选小区所需的随机接入信道RACH资源信息等中的至少一项)、该候选小区对应的资源信息(如物理层配置参数、MAC层配置参数、RLC层配置参数、PDCP层配置参数、SDAP层配置参数、RRC层配置参数等)等。
图4中示例性的示出了两个候选小区即小区#1(cell1)和小区#2(cell2)。第一消息包括cell1对应的CHO配置信息和cell2对应的CHO配置信息，也即第一CHO配置信息包括cell1对应的CHO配置信息和cell2对应的CHO配置信息。
第一消息可以是RRC消息，具体的，该第一消息可以重用现有的RRC消息，例如RRC重配置消息，该第一消息中可以包含用于添加或修改某个/某些候选小区的相关CHO配置信息的信元，例如增加修改列表(ToAddModList)信元；或者，该第一消息可以是新定义的RRC消息，例如，该第一消息是条件无线资源控制重配置(CondRRCReconfiguration)消息，或者是其他命名/表达形式，本申请实施例不做具体限定。
作为一种示例，以该第一消息为新定义的RRC消息(如CondRRCReconfiguration消息)为例，进行说明。该第一消息可以包括重配置增加修改列表(cond reconfiguration to add mod list或CondReconfigurationToAddModList)信元，用于进行相应的候选小区的CHO配置信息的添加、修改。进一步地，该重配置增加修改列表信元中包括与cell1对应的重配置(cond reconfiguration或CondReconfiguration)信元、与cell2对应的重配置(cond reconfiguration或CondReconfiguration)信元。与cell1对应的CondReconfiguration信元承载着cell1对应的CHO配置信息，与cell2对应的CondReconfiguration信元承载着cell2对应的CHO配置信息。换句话说，可以用CondReconfiguration信元来承载CHO配置信息，其中各个候选小区对应的CHO配置信息可以承载在各自对应的CondReconfiguration信元中。
作为示例而非限定，该新定义的RRC消息(如CondRRCReconfiguration消息)可以采用如下消息结构/ASN.1编码形式，但应理解，下述消息结构形式也适用于其他形式的第一消息。
Figure PCTCN2020107410-appb-000001
Figure PCTCN2020107410-appb-000002
在步骤S420，UE根据第一消息确定小区#1为目标小区，该目标小区为终端设备准备切换至的小区。
本申请实施例中，目标小区(即小区#1)例如可以是满足CHO触发条件的多个候选小区中的小区信号质量最高的小区，或者是满足CHO触发条件的多个候选小区中的优先级最高(如频率优先级最高)的小区，或者是满足CHO触发条件的多个候选小区中拥有最多优良波束(优良波束指的是波束的信号质量高于某预定门限值，该预定门限值可以包含在第一消息中，或者是协议约定的，本申请不做限定)的小区，或者是满足CHO触发条件的多个候选小区中的任一小区，或者满足其他条件的小区，本实施例不做限定。
在步骤S430，UE选择小区#1作为目标小区后，UE尝试接入小区#1。在UE尝试接入小区#1时，UE接收源基站发送的第二消息，第二消息包括第二CHO配置信息。
UE尝试接入cell1的过程，包括：UE在向cell1发送前导码之前；和/或UE与cell1进行RACH的过程中。示例性的，UE尝试接入cell1的过程具体可以包括：UE在向cell1发送前导码之前；和/或，在UE向cell1发送前导码之后至UE接收随机接入响应RAR之前；和/或，在UE接收RAR之后至UE向cell1发送RRC重配置完成消息之前；和/或，在UE向cell1发送前导码之后至UE向cell1发送RRC重配置完成消息之前。或者，在UE确定出cell1后但不执行与cell1的随机接入流程的情况下，可选地，UE尝试接入cell1的过程包括：UE向cell1发送RRC重配置完成消息之前。
第二消息可以是RRC消息，具体的，该第二消息可以重用现有的RRC消息，例如RRC重配置消息，该第二消息中可以包含用于添加或修改某个/某些候选小区的相关CHO配置信息的信元，例如ToAddModList信元，和/或，该第二消息中可以包含用于删除某个/某些候选小区的相关CHO配置信息的信元，例如ToRemoveList信元；或者，该第二消息可以是新定义的RRC消息，例如，该第二消息是CondRRCReconfiguration消息，或者是其他命名/表达形式，本申请实施例不做具体限定。
为方便理解，本申请实施例中，仅仅以网络设备分别通过RRC消息(例如现有的RRC消息或新定义的RRC消息)向终端设备发送第一CHO配置信息、第二CHO配置信息为例进行描述，其中第一CHO配置信息和第二CHO配置信息可以通过ToAddModList信元和/或ToRemoveList信元承载。在其他的实施例中，网络设备还可以通过其他消息、资源或其他方式为终端设备提供CHO配置信息，本申请实施例中UE根据配置信息进行处理的方法(例如图4中的步骤S440至步骤S450)同样适用。
为方便理解，本申请实施例中，以第二CHO配置信息是在第一CHO配置信息的基础上，用于对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过该候选小区)进行更改(例如添加/修改/删除)的信息为例进行说明。例如，第二CHO配置信息可 以用于进行新的候选小区的添加，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)的配置参数进行修改，和/或，对已经配置过的候选小区(例如，通过第一CHO配置信息已经配置过的候选小区)进行删除，下面将分情况讨论。
情况一
在步骤S430a，源基站向UE发送承载有第二CHO配置信息的第二消息，其中第二CHO配置信息包含cell1对应的CHO配置信息。也就是说，第二CHO配置信息用于对第一CHO配置信息已经配置过的候选小区cell1对应的CHO配置信息进行修改。
作为一种示例，以该第二消息为新定义的RRC消息(如CondRRCReconfiguration消息)为例，进行说明。具体地，该第二消息可以包括CondReconfigurationToAddModList信元，进一步地，该CondReconfigurationToAddModList信元中包括与cell1对应的CondReconfiguration信元。该与cell1对应的CondReconfiguration信元承载着cell1对应的修改后的CHO配置信息。
可选地，第二CHO配置信息中还可以包含新增候选小区对应的CHO配置信息。为方便理解，本申请实施例以新增候选小区为cell3为例，则第二CHO配置信息不仅用于修改通过第一CHO配置信息配置过的cell1对应的CHO配置信息，还用于添加cell3对应的CHO配置信息。换句话说，网络设备除了要修改cell1对应的CHO配置信息，还要添加其他的小区作为CHO的候选小区。
具体地，该第二消息可以包括CondReconfigurationToAddModList信元，进一步地，该CondReconfigurationToAddModList信元中除了包括与cell1对应的CondReconfiguration信元，还包括与cell3对应的CondReconfiguration信元。与cell1对应的CondReconfiguration信元承载着cell1对应的修改后的CHO配置信息，与cell3对应的CondReconfiguration信元承载着新增候选小区cell3对应的CHO配置信息。
在步骤S440a，UE判断目标小区是否发生变化。
UE接收到第二CHO配置信息后，根据第二CHO配置信息判断步骤S420中确定出来的目标小区即cell1是否发生变化，例如判断cell1对应的CHO配置信息是否发生变化，进而，确定是否继续切换至cell1。具体的，判断cell1对应的CHO配置信息是否发生变化的方法，可以参考上文关于“确定第一目标小区对应的CHO配置参数是否发生变化”的各种方式，在此不再赘述。具体的，例如，UE根据第二CHO配置信息确定cell1发生变化。
在步骤S450a，UE确定目标小区发生变化后，UE确定不再继续接入cell1，UE根据UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，UE可以存储更新后的CHO配置信息，且UE根据更新后的CHO配置信息重新进行CHO触发条件是否满足的判断，进而确定目标小区。
UE不再继续接入cell1，包括：如果UE还未向cell1发送前导码，则UE不向cell1发送前导码；如果UE正在跟cell1进行RACH流程，则UE停止与cell1正在进行的RACH过程。具体地，如果UE还未向cell1发送前导码，则UE不向cell1发送前导码；如果UE已经向cell1发送前导码但处于等待接收随机接入响应RAR，则UE不再接收RAR；如果UE已经接收RAR，但未向cell1发送RRC重配置完成消息，则UE不向cell1发送RRC 重配置完成消息；如果在UE确定出cell1后不执行与cell1的随机接入流程(即RACH-less切换)，UE停止与cell1正在进行的RACH过程，包括：在UE确定出cell1后，UE不向cell1发送RRC重配置完成消息。
UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，包括：UE根据第一CHO配置信息和第二CHO配置信息，对已经配置过的候选小区进行修改/更新，例如修改/更新cell1对应的CHO配置信息；或者UE根据第一CHO配置信息和第二CHO配置信息，进行新的候选小区的添加，例如，除了更新cell1对应的CHO配置信息，网络设备还提供cell3对应的CHO配置信息，则UE除了修改cell1对应的CHO配置信息，还将cell3添加为候选小区，即添加cell3对应的CHO配置信息，存储cell3对应的CHO配置信息。
UE根据更新后的CHO配置信息，停止与cell1的随机接入过程，且UE可以重新寻找满足CHO触发条件的目标小区，UE重新确定的目标小区可以仍为cell1，也可以是候选小区中除cell1外其他的满足CHO触发条件的小区。
情况二
在步骤S430b，源基站向UE发送承载有第二CHO配置信息的第二消息，该第二消息用于删除cell1(或者，用于删除cell1对应的CHO配置信息)。可选的，第二CHO配置信息包含cell1对应的小区索引、cell1对应的小区标识(例如CGI和/或PCI)、cell1对应的测量信息(例如测量频点或测量标识)或cell1对应的CHO配置信息或其他可以用来标识cell1的信息中的任意一项或多项。
作为一种示例，以该第二消息为新定义的RRC消息(如CondRRCReconfiguration消息)为例，进行说明。具体地，该第二消息可以包括重配置删除列表(cond reconfiguration to remove list或CondReconfigurationToRemoveList)信元，进一步地，该重配置删除列表信元包括与cell1对应的小区索引、cell1对应的小区标识、cell1对应的测量信息或cell1对应的CHO配置信息或其他可以用来标识cell1的信息中的任意一项或多项。
与cell1对应的小区索引(cellIndex)可以是网络设备在为UE提供cell1对应的CHO配置信息时提供的，例如第一消息中可以包括cell1对应的小区索引；与cell1对应的小区索引也可以是按照预设规则确定的，例如按照初始配置的顺序确定小区索引，第一消息中第一个配置的小区对应的小区索引为1，第二个配置的小区对应的小区索引为2，依此类推。
cell1对应的小区标识可以包括cell1的PCI和/或cell1的CGI，cell1对应的小区标识还可以包括cell1对应的频率信息。
与cell1对应的测量信息，可以包括测量标识(measure identification，MeasID)和/或测量频点(measure object，MeasObject)。测量标识和测量频点可以是网络设备在为UE提供CHO配置信息时提供的，每个候选小区有与之对应的测量标识和测量频点，即候选小区与测量标识/测量频点一一对应。可选的，与cell1对应的测量信息，还可以包括上报配置信息(如，ReportConfig)。
可选地，第二CHO配置信息中还可以包含除cell1外的其他候选小区对应的小区索引、小区标识、测量信息或CHO配置信息或其他可以用来标识候选小区的信息，即第二CHO配置信息不仅可以用于删除cell1对应的CHO配置信息，还用于删除除cell1外的其他已 经配置过的候选小区对应的CHO配置信息。
在步骤S440b，UE判断目标小区是否发生变化。
UE接收到第二CHO配置信息后，根据第二CHO配置信息判断步骤S420中确定出来的目标小区即cell1是否发生变化，例如判断cell1对应的CHO配置信息是否发生变化，进而，确定是否继续切换至cell1。具体的，判断cell1对应的CHO配置信息是否发生变化的方法，可以参考上文关于“确定第一目标小区对应的CHO配置参数是否发生变化”的各种方式，不再赘述。具体地，例如，UE根据第二CHO配置信息确定cell1被删除，换句话说，UE根据第二CHO配置信息确定cell1发生变化。
在步骤S450b，UE确定目标小区发生变化后，UE确定不再继续接入cell1，UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，UE可以存储更新后的CHO配置信息，且UE根据更新后的CHO配置信息重新进行CHO触发条件是否满足的判断，进而确定目标小区。
UE不再继续接入cell1，包括：如果UE还未向cell1发送前导码，则UE不向cell1发送前导码；如果UE正在跟cell1进行RACH流程，则UE停止与cell1正在进行的RACH过程。具体地，“UE停止与cell1正在进行的RACH过程”的具体方式可参照步骤S450a中的相关描述，不再赘述。
UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，包括：UE根据第一CHO配置信息和第二CHO配置信息，对已经配置过的候选小区进行删除，例如删除cell1(或，删除cell1对应的CHO配置信息，即UE将cell1对应的CHO配置信息从UE存储的CHO配置信息中删除)，如果CondReconfigurationToRemoveList信元中还包含除cell1外其他的候选小区对应的小区索引、小区标识、测量信息或CHO配置信息或其他可以用来标识候选小区的信息，则除了删除cell1，UE还将删除CondReconfigurationToRemoveList信元指示的其他的候选小区(或，删除CondReconfigurationToRemoveList信元指示的其他的候选小区对应的CHO配置信息)。应理解，UE删除某小区(如cell1)对应的CHO配置信息，可以理解为UE将该小区(如cell1)从CHO的候选小区列表中排除，即UE不再判断该小区是否满足CHO触发条件，或者，UE不再尝试切换至接入该小区。
UE根据更新后的CHO配置信息，停止与cell1的随机接入过程，且UE可以重新寻找满足CHO触发条件的目标小区，UE重新确定的目标小区可以是候选小区中除cell1外其他的满足CHO触发条件的小区。
情况三
在步骤S430c，源基站向UE发送承载有第二CHO配置信息的第二消息，其中第二CHO配置信息包含cell2对应的CHO配置信息。也就是说，第二CHO配置信息用于对第一CHO配置信息已经配置过的候选小区cell2对应的CHO配置信息进行修改。
作为一种示例，以该第二消息为新定义的RRC消息(如CondRRCReconfiguration消息)为例，进行说明。具体地，该第二消息可以包括CondReconfigurationToAddModList信元，进一步地，该CondReconfigurationToAddModList信元中包括与cell2对应的CondReconfiguration信元。该与cell2对应的CondReconfiguration信元承载着cell2对应的修改后的CHO配置信息。
可选地，第二CHO配置信息中还可以包含新增候选小区对应的CHO配置信息。为方便理解，本申请实施例以新增候选小区为cell3为例，则第二CHO配置信息不仅用于修改通过第一CHO配置信息中配置过的cell2对应的CHO配置信息，还用于添加cell3对应的CHO配置信息。换句话说，网络设备除了要修改cell2对应的CHO配置信息，还要添加其他的小区作为CHO的候选小区。
具体地，该第二消息可以包括CondReconfigurationToAddModList信元，进一步地，该CondReconfigurationToAddModList信元中除了包括与cell2对应的CondReconfiguration信元，还包含与cell3对应的CondReconfiguration信元。与cell2对应的CondReconfiguration信元承载着cell2对应的修改后的CHO配置信息，与cell3对应的CondReconfiguration信元承载着新增候选小区cell3对应的CHO配置信息。
在步骤S440c，UE判断目标小区是否发生变化。
UE接收到第二CHO配置信息后，根据第二CHO配置信息判断步骤S420中确定出来的目标小区即cell1是否发生变化，例如判断cell1对应的CHO配置信息是否发生变化。进而，确定是否继续切换至cell1。具体的，判断cell1对应的CHO配置信息是否发生变化的方法，可以参考上文关于“确定第一目标小区对应的CHO配置参数是否发生变化”的各种方式，不再赘述。具体的，例如，UE根据第二CHO配置信息确定cell1未发生变化。
在步骤S450c，UE确定目标小区未发生变化后，UE继续切换至小区#1(即cell1)，UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，UE可以存储更新后的CHO配置信息。
UE继续切换至cell1，包括：如果UE还未向cell1发送前导码，则UE向cell1发送前导码；如果UE正在跟cell1进行RACH流程，则UE继续与cell1进行RACH过程，具体地，如果UE已经向cell1发送前导码，则UE等待接收随机接入响应RAR；如果UE已经接收RAR，则UE向cell1发送RRC重配置完成消息。如果是RACH-less切换(在UE确定出cell1后不执行与cell1的随机接入流程)，UE继续切换至cell1，包括：UE向cell1发送RRC重配置完成消息。
UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，包括：UE可以对已经配置过的候选小区对应的CHO配置信息进行修改，例如修改cell2对应的CHO配置信息；和/或，UE进行新的候选小区的添加，例如，如果网络设备还提供cell3对应的CHO配置信息，则UE将cell3添加为候选小区，即添加cell3对应的CHO配置信息，存储cell3对应的CHO配置信息。
可选地，若UE成功接入cell1(即UE成功切换至cell1)，UE可以释放存储的除目标小区(即cell1)以外的其他所有候选小区对应的CHO配置信息。
可选地，若UE未能成功接入cell1(即UE未能成功切换至cell1)，UE根据更新后的CHO配置信息重新确定目标小区。
情况四
在步骤S430d，源基站向UE发送承载有第二CHO配置信息的第二消息，该第二消息用于删除cell2(或者，用于删除cell2对应的CHO配置信息)。可选的第二CHO配置信息包含cell2对应的小区索引、cell2对应的小区标识(例如CGI和/或PCI)、cell2对应 的测量信息(例如测量频点或测量标识)或cell2对应的CHO配置信息或其他可以用来标识cell2的信息中的任意一项或多项。
作为一种示例，以该第二消息为新定义的RRC消息(如CondRRCReconfiguration消息)为例，进行说明。具体地，该第二消息可以包括重配置删除列表(cond reconfiguration to remove list或CondReconfigurationToRemoveList)信元，进一步地，该重配置删除列表信元包括与cel2对应的小区索引、cell2对应的小区标识、cell2对应的测量信息或cell2对应的CHO配置信息或其他可以用来标识cell2的信息中的任意一项或多项。
与cell2对应的小区索引(cellIndex)可以是网络设备在为UE提供cell2对应的CHO配置信息时提供的，例如第一消息中可以包括cell2对应的小区索引；与cell2对应的小区索引也可以是按照预设规则确定的，例如按照初始配置的顺序确定小区索引，第一消息中第一个配置的小区对应的小区索引为1，第二个配置的小区对应的小区索引为2，依此类推。
cell2对应的小区标识可以包括cell2的PCI和/或cell2的CGI，cell2对应的小区标识还可以包括cell2对应的频率信息。
与cell2对应的测量信息，可以包括测量标识(measure identification，MeasID)和/或测量频点(measure object，MeasObject)。测量标识和测量频点可以是网络设备在为UE提供CHO配置信息时提供的，每个候选小区有与之对应的测量标识和测量频点，即候选小区与测量标识/测量频点一一对应。可选的，与cell2对应的测量信息，还可以包括上报配置信息(如，ReportConfig)。
可选地，第二CHO配置信息中还可以包含除cell2外的其他候选小区对应的小区索引、小区标识、测量信息或CHO配置信息或其他可以用来标识候选小区的信息，即第二CHO配置信息不仅可以用于删除cell2对应的CHO配置信息，还用于删除除cell2外的其他已经配置过的候选小区对应的CHO配置信息。
在步骤S440d，UE判断目标小区是否发生变化。
UE接收到第二CHO配置信息后，根据第二CHO配置信息判断步骤S420中确定出来的目标小区即cell1是否发生变化，例如判断cell1对应的CHO配置信息是否发生变化。进而，确定是否继续切换至cell1。具体的，判断cell1对应的CHO配置信息是否发生变化的方法，可以参考上文关于“确定第一目标小区对应的CHO配置参数是否发生变化”的各种方式，不再赘述。具体的，例如，UE根据第二CHO配置信息确定cell1未发生变化。
在步骤S450d，UE确定目标小区未发生变化后，UE继续切换至小区#1(即cell1)，UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，UE可以存储更新后的CHO配置信息。
其中，“UE继续切换至cell1”的具体方式可参照步骤S450c中的相关描述，不再赘述。UE根据第一CHO配置信息和第二CHO配置信息，进行CHO配置信息的更新，包括：UE根据第一CHO配置信息和第二CHO配置信息，对已经配置过的候选小区进行删除，例如删除cell2(或，删除cell1对应的CHO配置信息，即UE将cell1对应的CHO配置信息从UE存储的CHO配置信息中删除)；如果CondReconfigurationToRemoveList信元中还包含除cell1和cell2外其他的候选小区对应的小区索引、小区标识、测量信息或CHO 配置信息或其他可以用来标识候选小区的信息，则除了删除cell2，UE还将删除CondReconfigurationToRemoveList信元指示的其他的候选小区(或，删除CondReconfigurationToRemoveList信元指示的其他的候选小区对应的CHO配置信息)。应理解，UE删除某小区(如cell2)对应的CHO配置信息，可以理解为UE将该小区(如cell2)从CHO的候选小区列表中排除，即UE不再判断该小区是否满足CHO触发条件，或者，UE不再尝试切换至接入该小区。
可选地，若UE成功接入cell1(即UE成功切换至cell1)，UE可以释放存储的除目标小区(即cell1)以外的其他所有候选小区对应的CHO配置信息。
可选地，若UE未能成功接入cell1(即UE未能成功切换至cell1)，UE根据更新后的CHO配置信息重新确定目标小区。
需要说明的是，第二CHO配置信息可以承载于信元中，在一些实施例中，第二CHO配置信息中包括的候选小区对应的修改后的CHO配置信息和增加的候选小区对应的CHO配置信息可以承载于同一信元中，例如上述提及的CondReconfigurationToAddModList信元中，第二CHO配置信息中包括的用于删除候选小区对应的CHO配置信息的信息可以承载于其他信元中，例如上述提及的CondReconfigurationToRemoveList信元中。在另一些实施例中，第二CHO配置信息中包括的候选小区对应的修改后的CHO配置信息、增加的候选小区对应的CHO配置信息、用于删除候选小区对应的CHO配置信息的信息可以分别承载于不同的信元中，例如候选小区对应的修改后的CHO配置信息可以承载于重配置修改列表(CondReconfigurationToModList)信元中，增加的候选小区对应的CHO配置信息承载于重配置新增列表(CondReconfigurationToAddList)信元中，用于删除候选小区对应的CHO配置信息的信息承载于重配置删除列表(CondReconfigurationToRemoveList)信元中，本申请实施例不做具体限定。具体的信元配置形式可以由网络根据需要确定。
本申请实施例中，作为一种示例，在UE尝试接入已经确定出的目标小区的过程中(例如UE在向目标小区发送前导码前或UE在与目标小区进行RACH的过程中)，如果网络侧修改/删除该目标小区的相关配置，则UE停止与该目标小区的RACH流程，修改/删除该目标小区对应的CHO配置信息，UE根据更新后的CHO配置信息，重新进行新的目标小区的选择、新的目标小区的接入等后续流程。作为另一种示例，在UE尝试接入已经确定出的目标小区的过程中(例如UE在向目标小区发送前导码前或UE在与目标小区进行RACH的过程中)，如果网络侧修改/删除其他候选小区(非目标小区)对应的CHO配置信息，则UE可以继续与目标小区的RACH流程，且修改/删除其他候选小区所对应的CHO配置信息。本申请实施例提供的技术方案中，UE可以根据网络发送的CHO配置信息，进行正确的处理，从而可以使UE与网络侧的理解和行为保持一致，进而提高条件切换的可靠性，提升系统性能。
可以理解的是，以上各个方法实施例中，由终端设备实现的操作也可以由可配置于终端设备的部件(例如芯片或者电路)实现，由网络设备实现的操作也可以由可配置于网络设备的部件(例如芯片或者电路)实现。
上文结合图1至图4详细的描述了本申请实施例的方法实施例，下面结合图5至图6，详细描述本申请实施例的装置实施例。应理解，方法实施例的描述与装置实施例的描述相互对应，因此，未详细描述的部分可以参见前面方法实施例。
图5是本申请实施例提供的通信装置的示意性结构图。图5中的通信装置500可以是图1中的终端设备120的一个具体的例子。图5所示的通信装置500可以用于执行图3的方法，并且可以具体实现图4所示的实施例，为避免冗余，不再重复描述。
图5所示的通信装置500包括第一处理模块510和第二处理模块520。
第一处理模块510，用于根据第一条件切换CHO配置信息确定第一目标小区，所述第一目标小区为终端设备准备切换至的小区。
第二处理模块520，用于在尝试接入所述第一目标小区的过程中，如果接收到第二CHO配置信息，根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区；其中，所述在尝试接入所述第一目标小区的过程中，包括：在向所述第一目标小区发送前导码之前；和/或，在与所述第一目标小区进行随机接入RACH的过程中。
可选地，第二处理模块520具体用于根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数未发生变化，确定继续切换至所述第一目标小区。
可选地，如果所述通信装置500未能成功切换至所述第一目标小区时，第一处理模块510还用于根据所述第二CHO配置信息，或者，根据所述第一CHO配置信息和所述第二CHO配置信息确定所述通信装置500准备切换至的第二目标小区。
可选地，第二处理模块520具体用于根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数发生变化，根据所述第二CHO配置信息或者根据所述第一CHO配置信息和所述第二CHO配置信息确定所述通信装置500准备切换至的第三目标小区。
可选地，第一处理模块510也可以执行第二处理模块520所执行的动作或操作；第二处理模块520也可以执行第一处理模块510所执行的动作或操作。
可选地，所述第一CHO配置信息和/或所述第二CHO配置信息承载于无线资源控制RRC消息中。
可选地，所述通信装置500还包括接收模块，所述接收模块用于接收所述第一CHO配置信息和/或所述第二CHO配置信息。
可选地，所述通信装置500还包括存储模块，所述存储模块用于存储程序指令和/或数据。
可选地，所述第一处理模块510和所述第二处理模块520可以通过处理器实现。所述接收模块可以是通信接口，其中通信接口可以是收发器、电路、总线、模块、管脚或其它类型的通信接口。所述存储模块可以是存储器。上述模块之间可以相互分离，模块之间也可以耦合或集成。
图6是本申请一个实施例提供的装置的示意性结构图。图6所示的装置600可对应于前文描述的通信装置，例如终端设备，具体地装置600可以是图1中的终端设备120的一个具体的例子。装置600包括：处理器602。在本申请的实施例中，处理器602用于实现相应的控制管理操作，例如，处理器602用于支持通信装置执行前述实施例中图3或图4所示的方法或操作或功能。可选的，装置600还可以包括：存储器601和通信接口603；处理器602、通信接口603以及存储器601可以相互连接或者通过总线604相互连接。其中，通信接口603用于支持该通信装置进行通信，存储器601用于存储通信装置的程序代码和数据。处理器602调用存储器601中存储的代码或者数据实现相应的操作。该存储器601可以跟处理器耦合在一起，也可以不耦合在一起。本申请实施例中的耦合是装置、单 元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。
其中，处理器602可以是中央处理器单元，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，数字信号处理器和微处理器的组合等等。通信接口603可以是收发器、电路、总线、模块或其它类型的通信接口。总线604可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图6中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
本申请实施例还提供一种通信系统，包括网络设备和上文所述的终端设备。
本申请实施例还提供一种计算机程序存储介质，所述计算机程序存储介质具有程序指令，当所述程序指令被处理器执行时，使得处理器执行前文中的切换方法。
本申请实施例还提供一种芯片系统，其特征在于，所述芯片系统包括至少一个处理器，当程序指令在所述至少一个处理器中执行时，使得所述至少一个处理器执行前文中的切换方法。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计 算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (8)

  1. 一种切换方法，其特征在于，包括：
    根据第一条件切换CHO配置信息确定第一目标小区，所述第一目标小区为终端设备准备切换至的小区；
    在尝试接入所述第一目标小区的过程中，如果接收到第二CHO配置信息，根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区；
    其中，所述在尝试接入所述第一目标小区的过程中，包括：
    在向所述第一目标小区发送前导码之前；和/或，
    在与所述第一目标小区进行随机接入RACH的过程中。
  2. 根据权利要求1所述的切换方法，其特征在于，所述根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区，包括：
    根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数未发生变化，确定继续切换至所述第一目标小区。
  3. 根据权利要求1或2所述的切换方法，其特征在于，如果所述终端设备未能成功切换至所述第一目标小区，所述方法还包括：
    根据所述第二CHO配置信息，或者，根据所述第一CHO配置信息和所述第二CHO配置信息，确定所述终端设备准备切换至的第二目标小区。
  4. 根据权利要求1至3中任一项所述的切换方法，其特征在于，所述根据所述第二CHO配置信息确定是否继续切换至所述第一目标小区，包括：
    根据所述第二CHO配置信息确定所述第一目标小区对应的CHO配置参数发生变化，根据所述第二CHO配置信息，或者，根据所述第一CHO配置信息和所述第二CHO配置信息，确定所述终端设备准备切换至的第三目标小区。
  5. 根据权利要求1至4中任一项所述的切换方法，其特征在于，所述第一CHO配置信息和/或所述第二CHO配置信息承载于无线资源控制RRC消息中。
  6. 一种终端设备，其特征在于，包括用于执行如权利要求1至5中任一项所述的方法的模块。
  7. 一种通信装置，其特征在于，包括：处理器，与存储器耦合，用于执行所述存储器中的程序，使得所述通信装置执行如权利要求1至5中任一项所述的方法。
  8. 一种计算机可读存储介质，其特征在于，存储有计算机可执行指令，所述计算机可执行指令设置为执行如权利要求1至5中任一项所述的方法。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11956692B2 (en) * 2019-02-26 2024-04-09 Lg Electronics Inc. Relaxation of mobility condition based on serving cell quality
WO2023206570A1 (zh) * 2022-04-29 2023-11-02 北京小米移动软件有限公司 一种配置管理方法、装置、设备及存储介质

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EP3996419A4 (en) 2022-08-10
EP3996419A1 (en) 2022-05-11
CN114026914A (zh) 2022-02-08
CN112351462B (zh) 2021-12-24
US20220167234A1 (en) 2022-05-26
CN112351462A (zh) 2021-02-09

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