WO2021185259A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2021185259A1
WO2021185259A1 PCT/CN2021/081157 CN2021081157W WO2021185259A1 WO 2021185259 A1 WO2021185259 A1 WO 2021185259A1 CN 2021081157 W CN2021081157 W CN 2021081157W WO 2021185259 A1 WO2021185259 A1 WO 2021185259A1
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WO
WIPO (PCT)
Prior art keywords
network device
terminal device
information
time period
report
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Application number
PCT/CN2021/081157
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English (en)
French (fr)
Inventor
耿婷婷
严乐
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21771115.9A priority Critical patent/EP4124116A4/en
Publication of WO2021185259A1 publication Critical patent/WO2021185259A1/zh
Priority to US17/945,547 priority patent/US20230010109A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a communication method and device.
  • a mobility robustness optimization (MRO) mechanism can be introduced into the wireless communication system.
  • the MRO mechanism means that the terminal device generates an RLF report by recording the parameters in the process of mobility failure (such as radio link failure (RLF) or handover failure (HOF)) during the mobility process , And send the RLF report to the network device, and the terminal device can report the parameters during the mobility failure process to the network device, so that the network device can identify the configuration problem of its mobility parameters and optimize the mobility-related parameters in time.
  • RLF radio link failure
  • HAF handover failure
  • the terminal device after receiving the handover command, the terminal device still maintains a connection with the source network device and at the same time tries to establish a connection with the target network device. Therefore, it can be considered that in the DAPS handover scenario, the terminal device establishes a connection with the source network device and the target network device respectively. When one of the connections fails, the terminal device can also use another connection.
  • the existing MRO mechanism and RLF report cannot support network equipment to optimize the mobility parameters in the DAPS scenario.
  • a communication method and device in the embodiments of the present application are used to provide an MRO mechanism in a DAPS scenario to improve the handover success rate of terminal equipment.
  • the embodiments of the present application provide a communication method, which may be executed by a terminal device, or may be executed by a component (for example, a chip or a circuit) that can be configured in the terminal device.
  • the method may include: receiving a first message from the source network device, the first message being used to switch the terminal device from the source network device to the target network device; after receiving the first message, maintaining the communication between the terminal device and the source network device Data transmission; a connection failure between the terminal device and the source network device is detected; a first report is sent to the network device, the first report includes first indication information, and the first indication information is used to determine the terminal device and the source network device Whether the connection failure occurs before the terminal device is connected to the target network device.
  • the terminal device can record information related to the connection failure between the source network device, and send this information to the network device through the first report. In this way, the network device can identify potential faults based on the information. In the scene of late handover, to better adjust the handover parameters or trigger the handover earlier, so as to improve the handover success rate of the terminal device.
  • the connection failure between the terminal device and the source network device may be detected before the terminal device accesses the target network device; correspondingly, the following time may also be included in the first report
  • One or more items in the segment information first time period information, the first time period information being used to indicate the time period between receiving the first message and detecting the connection failure between the terminal device and the source network device;
  • the second time period information is used to indicate the time period between the detection of the connection failure between the terminal device and the source network device and the sending of the first report;
  • the third time period information the third time period The information is used to indicate the time period between the detection of the connection failure between the terminal device and the source network device and the time the terminal device accesses the target network device;
  • the fourth time period information the fourth time period information is used to instruct the terminal device to connect The time period between entering the target network device and sending the first report.
  • the network device can have a more comprehensive understanding of the occurrence time of each key event in the handover process of the
  • first time period information the first time period information being used to indicate the time period between receiving the first message and detecting the connection failure between the terminal device and the source network device
  • the second time period information the second time period information is used to indicate the time period between the detection of the connection failure between the terminal device and the source network device and the sending of the first report
  • the fourth time period information the fourth time period The information is used to indicate the time period between when the terminal device accesses the target network device and the first report is sent
  • the fifth time period information which is used to indicate that the first message is received until the terminal device accesses the target
  • the sixth information segment information the sixth time period information is used to indicate the time period between the terminal device accessing the target network device and the detection of the connection failure between the terminal device and
  • the method further includes: receiving conditional switching configuration information from the source network device, where the conditional switching configuration information includes a trigger condition of the conditional switching and at least one candidate target network device; If the trigger condition of the at least one candidate target network device is met, the target network device is determined from the at least one candidate target network device; correspondingly, the first report may also include second indication information, where the second indication information may be used to indicate the condition switching Before the trigger condition is met, it is detected that the connection between the terminal device and the source network device has failed, or the second indication information can also be used to indicate that after the trigger condition of the condition switch is met and the terminal device is connected to the target network device, it is detected The connection between the terminal device and the source network device fails, or the second indication information can also be used to indicate that the terminal device and the source network device are detected after the trigger condition of the condition switch is satisfied and the terminal device is connected to the target network device. The connection between the devices failed.
  • the first report may also include a trigger condition for indicating that the connection failure between the terminal device and the source network device is detected and the conditional switching is detected.
  • the second indication information of the sequence relationship between the events that are satisfied, the terminal device accesses the target network device, etc., so as to more accurately reflect the occurrence time of each key event in the handover process.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report may further include information at the aforementioned at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the first message is received Point, the point in time when the connection failure between the terminal device and the source network device is detected, the point in time when the terminal device is connected to the target network device, the point in time when the trigger condition of the condition switch is met, the point in time when the first report is sent .
  • the first report may also include handover type information, which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types.
  • handover type information which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the method further includes: receiving third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • the third indication information may be specifically used to indicate whether the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device, whether The first report needs to be recorded; or, the third indication information can be specifically used to indicate whether the first report needs to be recorded when the connection failure between the terminal device and the source network device occurs after the terminal device is connected to the target network device Or, the third indication information may also be specifically used to indicate whether the first release message needs to be recorded when the connection between the terminal device and the source network device does not fail when the terminal device receives the first release message from the target network device A report; or, the third indication information may also be specifically used to indicate whether the first report needs to be recorded when the handover type is a combination of DAPS handover and conditional handover; or, the third indication information may also be specifically used to indicate When the handover type is DAPS handover, if the connection failure between the terminal device and the source network device occurs before the first time point, whether it is necessary to record the first report.
  • the handover type is DAPS handover
  • the embodiments of the present application provide a communication method, which may be executed by a network device (for example, a third network device), or may be executed by a component (for example, a chip or a circuit) configured in the network device.
  • the method may include: receiving a first report from a terminal device, the first report including first indication information, the first indication information being used to determine whether a connection failure between the terminal device and the source network device occurs when the terminal device accesses Before reaching the target network device; send the first report to the source network device.
  • the third network device may forward the first report received from the terminal device to the source network device, so that the source network device can learn the information about the connection failure between the terminal device and the source network device. Information, identify potential scenarios of late handover, and then better adjust handover parameters or trigger handover earlier, so as to improve the handover success rate of terminal equipment.
  • connection failure between the terminal device and the source network device may occur before the terminal device accesses the target network device; correspondingly, the first report may also include the following time periods One or more items in the information:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the third time period information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device accessing the target network device; the fourth time period Segment information, where the fourth time period information is used to indicate the time period from when the terminal device accesses the target network device to when the terminal device sends the first report.
  • the source network device can have a more comprehensive understanding of the occurrence time of each key event in the handover process of the terminal device in a scenario where the terminal device and the source network device fail to connect before the terminal device accesses the target network
  • connection failure between the terminal device and the source network device may also occur after the terminal device accesses the target network device; correspondingly, the first report also includes the following time period information One or more of:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the fourth time period information is used to indicate the time period between the terminal device accessing the target network device and the terminal device sending the first report;
  • the fifth time period information the fifth time
  • the segment information is used to indicate the time period between when the terminal device receives the first message and the terminal device accesses the target network device;
  • the sixth information segment information is used to indicate that the terminal device accesses the target network device The time period between when the terminal device detects that the connection with the source network device fails.
  • the network device can have a more comprehensive understanding of the occurrence time of each key
  • the first report may also include second indication information; wherein, the second indication information may be used to indicate that the terminal device detects that it is in contact with the source network device before the trigger condition of the condition switch is satisfied.
  • the connection fails, or the second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the triggering condition of the condition switch is met and before accessing the target network device, or the The second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the trigger condition is met and after accessing the target network device.
  • the first report may also include a trigger condition for indicating that the connection failure between the terminal device and the source network device is detected and the conditional switching is detected.
  • the second indication information of the sequence relationship between the events that are satisfied, the terminal device accesses the target network device, etc., so as to more accurately reflect the occurrence time of each key event in the handover process.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report further includes information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the terminal device receives the first message Point, the point in time when the terminal device detects that the connection with the source network device fails, the point in time when the terminal device connects to the target network device, the point in time when the trigger condition of condition switching is met, and the point in time when the terminal device sends the first report Point in time.
  • the first report may also include handover type information, which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types.
  • handover type information which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the sending the first report to the source network device may be sending the first report to the core network device, and the core network device forwards the first report to the source network device.
  • the embodiments of the present application provide a communication method, which may be executed by a terminal device, or may be executed by a component (for example, a chip or a circuit) that can be configured in the terminal device.
  • the method may include: receiving a first message from a source network device, the first message being used to cause the terminal device to switch from the source network device to the target network device; maintaining data transmission between the terminal device and the source network device; Target network device; send a first report to the network device, the first report includes fourth indication information and/or eighth time period information, where the fourth indication information is used to determine whether the terminal device and the source network device are between When a connection failure occurs, the eighth time period information is used to indicate the time period between receiving the first message and receiving the first release message from the target network device, and the first release message is used to instruct the terminal device to release the connection with the source network device. the connection between.
  • the terminal device may also record various information during the handover process, such as the fourth indication information And/or the eighth time period information is sent to the network device through the first report, so that the network device can determine whether there is a possible handover scenario, so as to configure the handover parameters more reasonably.
  • the method further includes: receiving conditional switching configuration information from a source network device, the conditional switching configuration information includes a conditional switching trigger condition and at least one candidate target network device; The triggering condition of the handover is satisfied, and the target network device is determined from at least one candidate target network device.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report may also include information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the first message was received Point, the point in time when the target network device is successfully accessed, the point in time when the first release message is received, the point in time when the triggering condition of the condition switch is met, and the point in time when the first report is sent.
  • the first report also includes handover type information, which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, DAPS switch and conditional switch combination. Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the method further includes: receiving third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • the third indication information may be specifically used to indicate whether the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device, whether The first report needs to be recorded; or, the third indication information can be specifically used to indicate whether the first report needs to be recorded when the connection failure between the terminal device and the source network device occurs after the terminal device is connected to the target network device.
  • the third indication information can also be specifically used to indicate whether a record is required if the connection between the terminal device and the source network device does not fail when the terminal device receives the first release message from the target network device
  • the first report; or, the third indication information may also be specifically used to indicate whether the first report needs to be recorded when the handover type is a combination of DAPS handover and conditional handover; or, the third indication information may also be specifically used To indicate whether the first report needs to be recorded when the connection failure between the terminal device and the source network device occurs before the first point in time when the handover type is DAPS handover.
  • the embodiments of the present application provide a communication method, which may be executed by a network device (for example, a third network device), or may be executed by a component (for example, a chip or a circuit) configured in the network device.
  • the method may include: receiving a first report from a terminal device, the first report including fourth indication information and/or eighth time period information, where the fourth indication information is used to determine whether the communication between the terminal device and the source network device is When a connection failure occurs, the eighth time period information is used to indicate the time period between the terminal device receiving the first message and the terminal device receiving the first release message from the target network device, and the first release message is used to instruct the terminal device to release and Connection between source network devices; sending the first report to the source network device.
  • the terminal device may also record various information during the handover process, such as the fourth indication information And/or the eighth time period information, and send the first report to the network device, such as the third network device. Accordingly, the network device can forward the first report to the source network device, so that the source network device According to the information contained in the first report, it can be determined whether there is a possible handover scenario, so as to configure the handover parameters more reasonably.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report further includes information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the terminal device receives the first message Point, the point in time when the terminal device successfully accesses the target network device, the point in time when the terminal device receives the first release message, the point in time when the trigger condition of the condition switch is met, and the point in time when the terminal device sends the first report.
  • the first report may also include handover type information, which is used to indicate normal handover, dual activation protocol stack DAPS handover, conditional handover, and combination of DAPS handover and conditional handover Any of the switching types.
  • handover type information which is used to indicate normal handover, dual activation protocol stack DAPS handover, conditional handover, and combination of DAPS handover and conditional handover Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the sending the first report to the source network device may be sending the first report to the core network device, and the core network device forwards the first report to the source network device.
  • the embodiments of the present application provide a communication method, which may be executed by a terminal device, or may be executed by a component (for example, a chip or a circuit) that can be configured in the terminal device.
  • the method may include: receiving a first message from a source network device, the first message being used to make the terminal device switch from the source network device to the target network device; maintaining data transmission between the terminal device and the source network device; detecting the terminal device The connection with the source network device fails; the connection between the terminal device and the target network device is detected to fail; the first report is sent to the network device, and the first report includes the fifth indication information, the ninth time period information, and the first report.
  • One or more of the ten time period information where the fifth indication information is used to determine whether the connection between the terminal device and the source network device and the connection between the terminal device and the target network device have failed, and the ninth time
  • the segment information is used to indicate the time period between the detection of the connection failure between the terminal device and the source network device and the detection of the connection failure between the terminal device and the target network device
  • the tenth time period information is used to indicate the detection of the terminal device The time period between the failure of the connection with the target network device and the sending of the first report.
  • the terminal device may also record various information during the handover process, such as The fifth indication information, the ninth time period information, the tenth time period information, etc., are sent to the network device, such as the third network device, through the first report, so that the network device can determine whether there is a possible handover scenario, thereby Configure the switching parameters more reasonably.
  • the method further includes: receiving conditional switching configuration information from the source network device, the conditional switching configuration information includes a conditional switching trigger condition and at least one candidate target network device; The triggering condition of the handover is met, and the target network device is determined from at least one candidate target network device; correspondingly, the first report may also include second indication information, where the second indication information may be used to indicate the triggering of the conditional handover Before the condition is met, it is detected that the connection between the terminal device and the source network device fails, or the second indication information can also be used to indicate that the terminal is detected after the trigger condition of the condition switch is met and before the terminal device is connected to the target network device The connection between the device and the source network device fails, or the second indication information may also be used to indicate that after the trigger condition of the condition switch is met and the terminal device is connected to the target network device, it is detected that the terminal device and the source network device are connected The connection between the two failed.
  • the first report may also include a trigger condition for indicating that the connection failure between the terminal device and the source network device is detected and the conditional switching is detected.
  • the second indication information of the sequence of events such as being satisfied, the terminal device accessing the target network device, detecting the connection failure between the terminal device and the target network device, etc., so as to more accurately reflect the occurrence of each key event during the handover process time.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, and the source network device and/or target network device Cell quality information corresponding to the network device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report may also include information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the first message was received Point, the time point when the connection failure between the terminal device and the source network device is detected, the time point when the connection failure between the terminal device and the target network device is detected, the time point when the trigger condition of the condition switch is met, The point in time when the first report was sent.
  • the first report may also include handover type information, and the handover type information is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, DAPS switch, and conditional switch. Combine any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the method further includes: receiving third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • the third indication information may be specifically used to indicate whether a connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device, whether it is necessary Record the first report; or, the third indication information may also be specifically used to indicate whether it is necessary to record the first report when the connection failure between the terminal device and the source network device occurs after the terminal device is connected to the target network device.
  • the third indication information may also be used to specifically indicate whether the first release message needs to be recorded when the connection between the terminal device and the source network device does not fail when the terminal device receives the first release message from the target network device A report; or, the third indication information may also be specifically used to indicate whether the first report needs to be recorded when the handover type is a combination of DAPS handover and conditional handover; or, the third indication information may also be used to indicate When the handover type is DAPS handover, if the connection failure between the terminal device and the source network device occurs before the first time point, whether the first report needs to be recorded.
  • the embodiments of the present application provide a communication method, which may be executed by a network device (for example, a third network device), or may be executed by a component (for example, a chip or a circuit) configured in the network device.
  • a network device for example, a third network device
  • a component for example, a chip or a circuit
  • the method may include: receiving a first report from a terminal device, the first report including one or more of fifth indication information, ninth time period information, and tenth time period information, wherein the fifth indication information is To determine whether the connection between the terminal device and the source network device and the connection between the terminal device and the target network device have failed, the ninth time period information is used to indicate that the terminal device detects that the connection with the source network device fails to The time period between the terminal device detecting the connection failure with the target network device, and the tenth time period information is used to indicate the time period between the terminal device detecting the connection failure with the target network device and the terminal device sending the first report Time period; sending the first report to the source network device.
  • the terminal device may also record various information during the handover process, such as The fifth instruction information, the ninth time period information, the tenth time period information, etc., are sent to the network device, such as the third network device, through the first report, and correspondingly, the network device can forward the first report to the source network
  • the device in this way, enables the source network device to determine whether there is a possible handover scenario based on the information contained in the first report, so as to configure the handover parameters more reasonably.
  • the first report may further include second indication information; wherein, the second indication information may be used to indicate that the terminal device detects that it is in contact with the source network device before the trigger condition of the condition switch is satisfied.
  • the connection fails, or the second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the triggering condition of the condition switch is met and before accessing the target network device, or the The second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the trigger condition is met and after accessing the target network device.
  • the first report may also include a trigger condition for indicating that the connection failure between the terminal device and the source network device is detected and the conditional switching is detected.
  • the second indication information of the sequence of events such as being satisfied, the terminal device accessing the target network device, detecting the connection failure between the terminal device and the target network device, etc., so as to more accurately reflect the occurrence of each key event during the handover process time.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report further includes information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the terminal device receives the first message Point, the point in time when the terminal device detects that the connection with the source network device fails, the point in time when the terminal device detects that the connection with the target network device fails, the point in time when the trigger condition of the condition switch is met, The time point when the terminal device sends the first report.
  • the first report may also include handover type information, which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types.
  • handover type information which is used to indicate normal handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the sending the first report to the source network device may be sending the first report to the core network device, and the core network device forwards the first report to the source network device.
  • the embodiments of the present application provide a communication method, which may be executed by a core network device, or may be executed by a component (for example, a chip or a circuit) configured in the core network device.
  • the method may include: receiving a first report from a third network device, the first report including first indication information, and the first indication information is used to determine whether a connection failure between the terminal device and the source network device occurs in the terminal device Before accessing the target network device; send the first report to the source network device.
  • the core network device may also receive the first report from the network device (for example, the third network device), and send the first report to the source network device.
  • the forwarding of the first report can also be realized when the direct communication between the third network device and the source network device is not possible, so that the source network device can identify a potential late handover scenario based on the first report. Then better adjust the handover parameters or trigger the handover earlier to improve the handover success rate of the terminal device.
  • the method may further include: sending capability information of the terminal device to the source network device, where the capability information is used to indicate whether the terminal device supports recording the first report .
  • connection failure between the terminal device and the source network device may occur before the terminal device accesses the target network device; correspondingly, the following time periods may also be included in the first report One or more items in the information:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the third time period information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device accessing the target network device; the fourth time period Segment information, where the fourth time period information is used to indicate the time period from when the terminal device accesses the target network device to when the terminal device sends the first report.
  • the source network device can have a more comprehensive understanding of the occurrence time of each key event in the handover process of the terminal device in a scenario where the terminal device and the source network device fail to connect before the terminal device accesses the target network
  • connection failure between the terminal device and the source network device may also occur after the terminal device is connected to the target network device; correspondingly, the first report also includes the following time period information One or more of:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the fourth time period information is used to indicate the time period between the terminal device accessing the target network device and the terminal device sending the first report;
  • the fifth time period information the fifth time
  • the segment information is used to indicate the time period between when the terminal device receives the first message and the terminal device accesses the target network device;
  • the sixth information segment information is used to indicate that the terminal device accesses the target network device The time period between when the terminal device detects that the connection with the source network device fails.
  • the network device can have a more comprehensive understanding of the occurrence time of each key
  • the first report may further include second indication information; wherein, the second indication information may be used to indicate that the terminal device detects that it has contacted the source network device before the trigger condition of the condition switch is satisfied.
  • the connection fails, or the second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the triggering condition of the condition switch is met and before accessing the target network device, or the The second indication information may also be used to indicate that the terminal device detects that the connection with the source network device fails after the trigger condition is met and after accessing the target network device.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, source network device and/or target network Cell quality information corresponding to the device at at least one point in time. In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the first report further includes information at at least one point in time, and the at least one point in time includes one or more of the following points in time: the time when the terminal device receives the first message Point, the point in time when the terminal device detects that the connection with the source network device fails, the point in time when the terminal device connects to the target network device, the point in time when the trigger condition of condition switching is met, and the point in time when the terminal device sends the first report Point in time.
  • the first report may also include handover type information, which is used to indicate normal handover, dual-activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types.
  • handover type information which is used to indicate normal handover, dual-activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch Any of the switching types. In this way, it is convenient for the network device to further identify the handover parameters that need to be adjusted according to the handover type information.
  • the first report may also be the first report as described in the foregoing fourth aspect or any one of the possible designs of the fourth aspect, or the first report as described in the foregoing sixth aspect Or the first report described in any possible design of the sixth aspect. That is to say, the content included in the first report can be in the form of any possible design as in the above-mentioned second aspect or the second aspect, or in any form as in the above-mentioned fourth aspect or the fourth aspect.
  • the possible design form may also be any one of the possible design forms of the sixth aspect or the sixth aspect described above.
  • the embodiments of the present application also provide a communication method, which may be executed by a terminal device, or may be executed by a component (for example, a chip or a circuit) that can be configured in the terminal device.
  • the method may include: the terminal device receives a first message from the source network device, and the first message is used to switch the terminal device from the source network device to the target network device, and the terminal device maintains the relationship with the source network device.
  • the terminal device detects that the connection with the target network device fails, when the cell of the source network device is available, the terminal device and the source network device perform communication between the terminal device and the source network device.
  • the terminal device sends a first report.
  • the first report may include at least one of the following: fifth indication information, seventh indication information, tenth time period information, eleventh time period information, and twelfth time period. Segment information, the time period between the terminal device detecting the connection failure with the target network device and the terminal device initiating the RRC re-establishment process, the terminal device detecting the connection failure with the target network device to the terminal device and the source network device The time period between successful connection restoration.
  • the embodiments of the present application also provide a communication method, which may be executed by a third network device, or may be executed by a component (such as a chip or a circuit) that can be configured in the third network device.
  • the network device receives the first report from the terminal device.
  • the first report reference may be made to the description of the eighth aspect.
  • an embodiment of the present application provides a communication device that has the function of a terminal device in any possible design of the first aspect or the first aspect, or has the third aspect or the third aspect.
  • the device may be a terminal device or a chip included in the terminal device.
  • the device may also have the function of realizing the third network device in any possible design of the second aspect or the second aspect, or the third network device in any possible design of the fourth aspect or the fourth aspect.
  • the function of the network device either has the function of realizing the third network device in any possible design of the sixth aspect or the sixth aspect, or has the function of realizing the third network device in the ninth aspect.
  • the third network device may be a source network device, a target network device, or other network devices different from the source network device and the target network device.
  • the device may be a network device or a chip included in the network device.
  • the device may also have the function of realizing the core network device in any possible design of the seventh aspect or the seventh aspect.
  • the device may be a core network device or a chip included in the core network device.
  • the functions of the above-mentioned communication device may be realized by hardware, or may be realized by hardware executing corresponding software.
  • the hardware or software includes one or more modules or units or means corresponding to the above-mentioned functions.
  • the structure of the device includes a processing module and a transceiver module, wherein the processing module is configured to support the device to perform the first aspect or the corresponding function of the terminal device in any of the first aspects of the design.
  • the processing module is configured to support the device to perform the first aspect or the corresponding function of the terminal device in any of the first aspects of the design.
  • the transceiver module is used to support communication between the device and other communication devices. For example, when the device is a terminal device, it can send a first report to a third network device.
  • the communication device may also include a storage module, which is coupled with the processing module, which stores program instructions and data necessary for the device.
  • the processing module may be a processor
  • the communication module may be a transceiver
  • the storage module may be a memory.
  • the memory may be integrated with the processor or may be provided separately from the processor, which is not limited in this application.
  • the structure of the device includes a processor and may also include a memory.
  • the processor is coupled with the memory, and can be used to execute the computer program instructions stored in the memory, so that the device executes the above-mentioned first aspect or any one of the possible design methods of the first aspect, or executes the above-mentioned second aspect or the second aspect.
  • the 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; when the device is a chip included in the network device or terminal device, the communication interface may be an input/output interface of the chip.
  • the transceiver may be a transceiver circuit, and the input/output interface may be an input/output circuit.
  • an embodiment of the present application provides a chip system, including: a processor, the processor is coupled with a memory, the memory is used to store a program or instruction, when the program or instruction is executed by the processor
  • the chip system implements the method in any possible design of the first aspect or the first aspect, or implements the method in any possible design of the second aspect or the second aspect, or implements the foregoing
  • the third aspect or the method in any possible design of the third aspect, or the method in any one of the possible designs of the foregoing fourth aspect or the fourth aspect, or the realization of the foregoing fifth aspect or the fifth aspect Any method in a possible design, or a method in any possible design that implements the sixth aspect or the sixth aspect, or a method in any possible design that implements the seventh aspect or the seventh aspect Method or method for implementing the above-mentioned eighth or ninth aspect.
  • the chip system further includes an interface circuit, which is used to exchange code instructions to the processor.
  • processors in the chip system, and the processors may be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may be a non-transitory processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip, or may be set on different chips.
  • the setting method of the processor is not specifically limited.
  • an embodiment of the present application provides a computer-readable storage medium on which a computer program or instruction is stored.
  • the computer program or instruction is executed, the computer is caused to execute any of the above-mentioned first aspect or the first aspect.
  • a method in a possible design, or a method in any possible design of the second aspect or the second aspect, or a method in any possible design of the third aspect or the third aspect Or implement the method in any possible design of the foregoing fourth aspect or the fourth aspect, or implement the method in any possible design of the foregoing fifth aspect or the fifth aspect, or implement the foregoing sixth aspect or The method in any possible design of the sixth aspect, or the method in any possible design of the seventh aspect or the seventh aspect described above, or the method in the eighth aspect or the ninth aspect described above.
  • the embodiments of the present application provide a computer program product.
  • the computer reads and executes the computer program product, the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the first aspect or any one of the possible design methods in the first aspect.
  • the computer executes the
  • an embodiment of the present application provides a communication system.
  • the communication system includes a terminal device and a third network device.
  • the communication system may also include a source network device and a target network device.
  • the third network device may be the same network device as the source network device or the target network device, and the third network device may also be different from Other network devices of the source network device and the target network device.
  • the communication system may also include core network equipment.
  • FIG. 1 is a schematic diagram of a network architecture of a communication system to which an embodiment of this application is applicable;
  • FIG. 2 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 3 is a schematic diagram of the division of time periods when the terminal device detects a connection failure with the source network device before accessing the target network device in an embodiment of the application;
  • FIG. 4 is a schematic diagram of the division of time periods when the terminal device detects a connection failure with the source network device before accessing the target network device in an embodiment of the application;
  • FIG. 5 is a schematic diagram of a point in time when a terminal device may detect a connection failure with a source network device in a scenario of conditional switching in an embodiment of the application;
  • FIG. 6 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic diagram of another structure of a communication device provided by an embodiment of the application.
  • FIG. 10 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 11 is another schematic structural diagram of another communication device provided by an embodiment of the application.
  • FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 13 is another schematic structural diagram of yet another communication device provided by an embodiment of this application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WIMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NR new radio
  • FIG. 1 is a schematic structural diagram of a communication system to which an embodiment of this application is applied.
  • the communication system includes a terminal device, a source network device, and a target network device.
  • the source network device refers to the network device that the terminal device accesses before the cell handover is performed
  • the target network device refers to the network device that the terminal device accesses after the cell handover is performed.
  • the source cell refers to a cell that the terminal device accesses before performing cell handover, and the source cell is a cell under the coverage of the source network device, or the source cell is a cell under the jurisdiction of the source network device.
  • a target cell refers to a cell that a terminal device accesses after performing a cell handover, and the target cell is a cell under the coverage of the target network device, or the target cell is a cell under the jurisdiction of the target network device.
  • the communication system may further include a third network device, and the third network device refers to a network device that reports a radio link failure RLF report by the terminal device.
  • the third network device may be a source network device or a target network device, or may be another network device different from the source network device and the target network device.
  • the terminal device can send an RLF report to the source network device, can also send an RLF report to the target network device, and can also report an RLF report to the source network device or other network devices other than the target network device. This application is not limited .
  • the terminal device may be switched from the source network device to the target network device due to the movement of the location, the change of the type of service performed, or other reasons, which is not limited in this application.
  • the source network device, target network device, or third network device mentioned in the embodiment of the present application may be an access network device, such as a base station.
  • Access network devices correspond to different devices in different systems, for example, in a 5G system, they correspond to access network devices in 5G, such as gNB.
  • the source network device, the target network device, or the third network device mentioned in the embodiments of this application may be access network devices supporting the same or different communication standards, which is not limited by this application.
  • one terminal device is shown in FIG. 1, it can be understood that one network device can provide services for one or more terminal devices.
  • the embodiment of the present application has an impact on the number of network devices included in the communication system and the number of terminal devices. The quantity is not limited.
  • the source network device After the source network device sends the handover command message to the terminal device, it can continue to send downlink data packets to the terminal device.
  • the source network device can perform downlink data forwarding with the target network device.
  • the source network device may associate one or more PDCP service data units (service data unit, SDU) assigned with a packet data convergence protocol (packet data convergence protocol, PDCP) sequence number (sequence number, SN) with its corresponding PDCP
  • SDU packet data convergence protocol
  • PDCP packet data convergence protocol
  • sequence number sequence number
  • the target network device For these PDCP SDU(s) received from the source network device, the target network device can use its own corresponding header compression context, key, etc.
  • PDCP protocol data unit protocol data unit
  • PDU protocol data unit
  • the terminal device After receiving the handover command message, the terminal device keeps data transmission with the source network device. That is, the terminal device maintains the user plane protocol stack corresponding to the source base station, and does not perform layer 2 (layer 2 includes media access control (MAC)/radio link control layer) on the user plane protocol stack corresponding to the source side. control, RLC)/PDCP/service data adaptation protocol (service data adaptation protocol, SDAP) protocol layer) recovery/reestablishment, and the terminal device establishes a user plane protocol stack corresponding to the target side for communicating with the target network device Random access and data transmission.
  • layer 2 includes media access control (MAC)/radio link control layer
  • the terminal device Before the terminal device releases the connection with the source network device, the terminal device maintains two sets of security keys (or security context), two sets of header decompression context (or two sets of header compression context), and according to whether the data packet comes from the source network The device is still the target network device, and the corresponding key/header decompression context is used to process the received data packet.
  • security keys or security context
  • header decompression context or two sets of header compression context
  • the terminal device uses the header decompression corresponding to the source network device
  • the compression context performs header decompression and decryption of the security key corresponding to the source network device
  • the terminal device uses the header decompression context corresponding to the target network device to perform header decompression,
  • the security key corresponding to the target network device performs decryption and other processing.
  • the terminal device can continue to transmit uplink data with the source network device.
  • the terminal device will perform a random access RACH process to the target network device.
  • the RACH process is successful (for example, for a non-contention-based RACH process, when the terminal device receives a message MSG2 or a message msgB, such as a random access response (RAR) message; for a contention-based RACH process, the terminal device Determine conflict resolution. For example, when the terminal device receives a contention conflict resolution message, and the conflict resolution identifier is the conflict resolution identifier corresponding to the terminal device), the terminal device performs uplink path switching.
  • the terminal device no longer performs a new PDCP SDU uplink transmission with the source network device.
  • the UE starts to perform a new PDCP SDU uplink transmission with the target network device.
  • Conditional handover means that the source network device can send a handover request message to at least one target network device, and at least one target network device can reserve corresponding resources for the terminal device. Configuration, the at least one target network device can be understood as a candidate target network device.
  • the source network device sends the above-mentioned conditional switching configuration information of the at least one target network device to the terminal device, and the terminal device determines whether to perform the switching according to whether the triggering condition of the conditional switching is satisfied. When the trigger condition of the conditional switch is satisfied, the terminal device may initiate a switch to one of the at least one candidate target network device.
  • Terminal equipment is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air ( For example, airplanes, balloons, satellites, etc.
  • the terminal device may communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN.
  • the terminal device may be a mobile phone (mobile).
  • the embodiments of this application do not limit the application scenarios. Terminal devices may also be used sometimes. It is called user equipment (UE), mobile station, remote station, etc.
  • the embodiments of the present application do not limit the specific technology, device form, and name adopted by the terminal device.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be referred to as wearable smart devices or smart wearable devices, etc. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes Wait.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • Use such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.
  • the terminal device in the embodiments of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit that is built into a vehicle as one or more components or units, and the vehicle passes through the built-in vehicle-mounted module, vehicle-mounted Modules, on-board components, on-board chips, or on-board units can implement the method of the present application.
  • Network equipment also called access network equipment, is a device in the network used to connect terminal equipment to the wireless network.
  • the network device may be a node in a radio access network, may also be called a base station, or may be called a radio access network (RAN) node (or device).
  • the network device can be used to convert received air frames and Internet Protocol (IP) packets into each other, and act as a router between the terminal device and the rest of the access network, where the rest of the access network can include an IP network.
  • IP Internet Protocol
  • the network equipment can also coordinate the attribute management of the air interface.
  • the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional NodeB) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), such as
  • LTE long term evolution
  • LTE-A evolved LTE system
  • the traditional macro base station eNB and the micro base station eNB in the heterogeneous network scenario may also include the next generation node B (next generation) in the new radio (NR) system of the fifth generation mobile communication technology (5th generation, 5G).
  • NR new radio
  • node B node B, gNB
  • RNC radio network controller
  • node B node B
  • BSC base station controller
  • BTS base transceiver station
  • TRP transmission reception point
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • baseband unit BBU
  • BBU baseband pool BBU pool
  • wireless fidelity wireless fidelity, WiFi
  • AP integrated access and backhaul
  • IAB integrated access and backhaul
  • CloudRAN cloud radio access network
  • the centralized unit (centralized unit, CU) and/or distributed unit (distributed unit, DU) in the system is not limited in the embodiment of the present application.
  • the network device may be a CU node, or a DU node, or an access network device including a CU node and a DU node.
  • CU nodes can be divided into control plane (CU-CP) and user plane (CU-UP), where CU-CP is responsible for control plane functions, mainly including radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP)-C, PDCP-C is mainly responsible for the encryption and decryption of control plane data, integrity protection, and data transmission.
  • CU-UP is responsible for user plane functions, mainly including service data adaptation protocol (SDAP) and PDCP-U.
  • SDAP service data adaptation protocol
  • SDAP is mainly responsible for processing core network data and mapping flow to bearer.
  • PDCP-U is mainly responsible for data encryption and decryption, integrity protection, header compression, serial number maintenance, data transmission, etc.
  • CU-CP and CU-UP can be connected via E1 interface.
  • CU-CP stands for CU connected to the core network through the Ng interface, and connected to the DU through F1-C (control plane).
  • CU-UP is connected to DU through F1-U (user plane).
  • F1-C control plane
  • F1-U user plane
  • PDCP-C is also in CU-UP.
  • “Multiple” refers to two or more than two. In view of this, “multiple” may also be understood as “at least two” in the embodiments of the present application. "At least one” can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and it does not limit which ones are included. For example, if at least one of A, B, and C is included, then A, B, C, A and B, A and C, B and C, or A and B and C are included. In the same way, the understanding of "at least one" and other descriptions is similar.
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or importance of multiple objects.
  • the descriptions of “first” and “second” do not limit the objects to be different.
  • the terminal device and/or the network device can perform some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application may also perform other operations or various operations. Deformation of the operation. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it may not be necessary to perform all the operations in the embodiments of the present application.
  • FIG. 2 is a schematic flowchart of a communication method provided by an embodiment of this application. The method includes the following steps:
  • Step S201 The terminal device receives a first message from the source network device, where the first message is used to switch the terminal device from the source network device to the target network device.
  • the first message may be a reconfiguration message or other messages, which is not limited in this application.
  • the reconfiguration message may be, for example, an RRC reconfiguration message or an RRC connection reconfiguration message.
  • the first message may include a switching command.
  • the switching command is used to instruct or configure the terminal device to switch from the source network device to the target network device.
  • the switching command may also be understood as a command sent by the source network device to instruct the terminal Information about the device switching.
  • the switching command may also be referred to as switching instruction or switching command information, or has other names, which is not limited in this application.
  • the switching command may also be specifically a DAPS switching command, that is, information used to instruct the terminal device to perform DAPS switching.
  • Step S202 After receiving the first message, the terminal device keeps data transmission with the source network device.
  • the data transmission between the terminal device and the source network device means that the terminal device maintains the protocol stack corresponding to the source network device, and does not perform layer 2 recovery or re-establishment of the protocol stack corresponding to the source side.
  • the protocol stack includes Control plane protocol stack and/or user plane protocol stack. In this way, in the downlink direction, the terminal device can continue to receive data from the source network device, and in the uplink direction, the terminal device can continue to send data to the source network device.
  • the embodiments of the present application can be applied to the DAPS handover scenario.
  • the terminal device receives the first message from the source network device, while maintaining the protocol stack corresponding to the source network device, it can also establish a connection with the target network.
  • the protocol stack corresponding to the device, and the random access RACH process is executed to access the target network device.
  • the random access procedure may succeed or fail, which is not limited in this application. That is to say, the method provided in the embodiments of the present application is applicable to scenarios where the terminal device successfully accesses the target network device, and also applicable to scenarios where the terminal device fails to access the target network device.
  • the terminal device’s unsuccessful access to the target network device may include that the terminal device’s connection with the target network device failed after a short time after establishing a connection with the target network device; or, it may include an access failure, that is, the terminal device failed to connect to the target network device. Successfully establish a connection with the target network device.
  • the access failure may refer to a failure of the random access process, or the terminal device cannot successfully send a reconfiguration complete message to the target network device.
  • the terminal device may also receive a first release message from the target network device, where the first release message is used to instruct the terminal device to release the connection with the source network device.
  • Step S203 The terminal device detects that the connection with the source network device fails.
  • the connection failure between the terminal device and the source network device may occur before the terminal device accesses the target network device, or after the terminal device accesses the target network device.
  • the terminal device can detect that the connection to the source network device fails before accessing the target network device; for example, it detects that the connection to the source network device fails before performing the random access procedure to the target network device.
  • the terminal device can also detect that the connection with the source network device fails after accessing the target network device; for example, after the random access process is successful, before or after sending the handover complete message to the target network device, it detects the connection with the source network device. The connection between the source network devices failed.
  • the terminal device may detect that the connection with the source network device fails after sending a handover complete message to the target network device after the random access process is successful; or the terminal device may send a handover complete message to the target network device After that, and before receiving the first release message sent by the target network device, it is detected that the connection with the source network device fails.
  • connection failure between the terminal device and the source network device occurs before the terminal device is connected to the target network device, then the terminal device will not execute the source after detecting the connection failure with the source network device.
  • the side user plane protocol stack is re-established, but the random access process to the target network device is continued.
  • Step S204 The terminal device sends a first report to the third network device, where the first report includes first indication information and/or at least one time period information.
  • the first indication information is used to determine whether the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device.
  • the first indication information may indicate whether the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device, that is, it clearly indicates that the terminal device and the source network device Whether the connection failure occurs before or after the terminal device is connected to the target network device.
  • the first indication information can be a bit, and the bit can be set to 0 or 1. When the bit is set to 0, it can indicate that the connection failure between the terminal device and the source network device occurred on the terminal device. Before connecting to the target network device, when this bit is set to 1, it can indicate that the connection failure between the terminal device and the source network device occurred after the terminal device was connected to the target network device.
  • the first indication information may also separately indicate that the connection failure between the terminal device and the source network device occurred before the terminal device accesses the target network device, or separately indicate that the terminal device and the source network device The connection failure between the devices occurs after the terminal device is connected to the target network device.
  • the first indication information may be a preset flag. When the flag is included in the first report, it may indicate that the connection failure between the terminal device and the source network device occurred before the terminal device accesses the target network device. ; When the flag is not included in the first report, it may indicate that the connection failure between the terminal device and the source network device occurred after the terminal device accesses the target network device.
  • the first report does not necessarily include the first indication information, and the first indication information may also be optional information in the first report.
  • the at least one time period information may also be optional information in the first report. If the first report does not contain the first indication information, but contains at least one time period information, in this case, the network device can still determine the terminal device and the source network based on the at least one time period information in the first report Whether the connection failure between the devices occurs before or after the terminal device accesses the target network device, because the time period is different in different scenarios.
  • the at least one time period information in the first report may include one or more of the following time period information : The first time period information, the second time period information, the third time period information, and the fourth time period information.
  • the division of the foregoing various time periods can be shown in Figure 3, where the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails.
  • This time period may correspond to the time period T1 in FIG. 3.
  • the second time period information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device sending the first report, and the time period may correspond to the time period T2 in FIG. 3.
  • the third time period information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device accessing the target network device, and the time period may correspond to the time period T3 in FIG. 3.
  • the access to the target network device may mean that the terminal device initiates a random access procedure to the target network device, or the terminal device sends a reconfiguration complete message to the target network device.
  • the fourth time period information is used to indicate the time period between the terminal device accessing the target network device and the terminal device sending the first report, and the time period may correspond to the time period T4 in FIG. 3.
  • the source network device may perform a handover procedure with the target network device in step S301.
  • the source network device decides to perform DAPS handover from the terminal device to the target network device; then the source network device sends a handover request message to the target network device, and the target network device performs access control after receiving the handover request message; if allowed
  • the target network device sends a handover notification message to the source network device, and the handover notification message is used to instruct the source network device to allow the terminal device to switch.
  • the source network device may send a first message to the terminal device in step S302 to instruct the terminal device to switch.
  • step S303 after receiving the first message, the terminal device may maintain data transmission with the source network device.
  • step S304 the terminal device detects that the connection with the source network device fails.
  • step S305 the terminal device performs a random access procedure to the target network device to access the target network device. It should be noted that here, step S304 is executed before step S305, which means that the terminal device detects that the connection with the source network device fails before accessing the target network device.
  • the terminal device may record various parameters in the handover process, such as the first indication information and/or at least one time period information mentioned above, or may also include other information, and generate a first report . Then in step S307, the terminal device sends the generated first report to the third network device.
  • the third network device may receive the first report from the terminal device.
  • the third network device may further send the first report to the required network device, such as the source network device.
  • the terminal device may also perform step S306 after step S304, and then perform step S305, step S307, and step S308. That is, after the terminal device detects that the connection with the source network device fails, it records various parameters during the switching process.
  • steps S301 to S309 shown in FIG. 3 are a specific implementation of each step shown in FIG. 2, or can also be understood as a refinement or extension of each step shown in FIG. 2.
  • step S302 may correspond to step S201
  • step S303 may correspond to step S202
  • step S304 may correspond to step S203
  • step S307 may correspond to step S204
  • step S308 may correspond to step S205
  • step S309 may correspond to This corresponds to step S206.
  • each time period can be divided according to the time point of each key event in the handover process, and there is an overlap, or a relationship between inclusion and inclusion between some time periods.
  • the time period indicated by the second time period information (that is, the time period T2) is composed of the time period indicated by the third time period information (that is, the time period T3) and the time period indicated by the fourth time period information (that is, the time period T4), In this way, according to any two of the time periods T2, T3, and T4, the information of another time period can also be known.
  • the time point of each key event in the handover process may also include the time point when at least one of the following key events occurs: receiving a message related to the handover configuration, the triggering condition of the conditional handover is satisfied, and the terminal device and the source network device are detected
  • the connection fails, the target network device is accessed, and the connection failure between the terminal device and the target network device is detected, the first release message from the target network device is received, and the first report is sent to the network device.
  • the at least one time period information in the first report may also include the first time period information and the second time period information.
  • the time point at which the connection between the network devices fails is divided into time periods.
  • the at least one time period information in the first report may also include the first time period information, the third time period information, and the fourth time period information.
  • This implementation manner can also be understood In order to divide the time period according to the key events in the handover process of the terminal device, such as the failure of the connection with the source network device, the success of the random access to the target network device, etc.
  • the first report may include one or more of the following time period information: the first time period information, the first time period information Second time period information, fourth time period information, fifth time period information, and sixth time period information.
  • the division of the foregoing various time periods can be shown in FIG. 4, where the description of the first time period information, the second time period information, and the fourth time period information can refer to the detailed description in the foregoing embodiment, and will not be repeated here.
  • the first time period, the second time period, and the fourth time period may correspond to the time periods T1, T2, and T4 shown in FIG. 4, respectively.
  • the fifth time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device accesses the target network device, and the time period may correspond to the time period T5 shown in FIG. 4.
  • the sixth time period information is used to indicate the time period from when the terminal device accesses the target network device to when the terminal device detects that the connection with the source network device fails. This time period may correspond to the time period shown in FIG. 4 T6.
  • step S404 corresponds to step S305 in FIG. 3
  • step S405 corresponds to step S304 in FIG. 3. That is to say, in the example shown in Figure 4, the terminal device first performs a random access process to the target network device, accesses the target network device, and then detects that the connection with the source network device fails, that is, Step S404 is executed before step S405, which is different from the execution order of step S304 and step S305 in FIG. 3.
  • steps S401 to S409 shown in FIG. 4 are another specific implementation of the steps shown in FIG. 2, or can also be understood as another detailed implementation of the steps shown in FIG. 2. Or expand.
  • each time period information may include at least one of the start time point, end time point, and duration of the indicated time period.
  • the terminal device can receive conditional switching configuration information from the source network device.
  • the conditional switching configuration includes the triggering condition of the conditional switching and at least one candidate.
  • Target network device If the trigger condition is met, the terminal device can determine a target network device from at least one candidate target network device, and then perform a random access process to the target network device.
  • the terminal device executes the switching to the target network device after the triggering condition of the conditional switching is satisfied.
  • the conditional switching configuration information may be sent in the first message described in step S201, or may be sent in other messages, which is not limited in this application.
  • the conditional switching configuration information and the DAPS switching command can be sent in the same message or in different messages.
  • connection failure between the terminal device and the source network device may occur before the triggering condition of the conditional switching is satisfied, or it may occur after the triggering condition of the conditional switching is satisfied.
  • the connection failure between the terminal device and the source network device may occur at one of the three possible connection failure points shown in FIG. 5.
  • the first connection failure point indicates that the connection failure between the terminal device and the source network device occurs before the trigger condition of the condition switch is met, and of course it is also before the terminal device connects to the target network device;
  • the second connection failure point indicates the terminal The connection failure between the device and the source network device occurs after the trigger condition of the condition switch is met, but before the terminal device is connected to the target network device;
  • the third connection failure point indicates that the connection between the terminal device and the source network device fails After the terminal device is connected to the target network device, of course, it is also after the trigger condition of the condition switch is satisfied.
  • the first report may also include second indication information, which is used to indicate that the terminal device detects that the connection with the source network device fails before the trigger condition is met; or the second indication information is also available Instructing the terminal device to detect a connection failure with the source network device after the trigger condition is met and before connecting to the target network device; or the second indication information can be used to instruct the terminal device to connect to the source network device after the trigger condition is met After the target network device, it was detected that the connection with the source network device failed.
  • the embodiment of the present application does not limit the specific form of the second indication information.
  • the first report may include information about the source network device and/or the target network device.
  • the first report may include one or more of the following information: cell information of the source network device and/or target network device, cell quality information corresponding to the source network device and/or target network device at at least one point in time . In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the cell information of the source network device may refer to the information of the source cell
  • the cell information of the target network device may refer to the information of the target cell.
  • the information of the cell may include the cell global identifier (CGI), physical cell identifier (PCI), frequency, cell identifier, and tracking area code (TAC) of the cell. ) At least one of.
  • the cell quality information may include received signal code power (RSCP), reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), and signal-to-noise ratio (RSRP). At least one of signal noise ratio (SNR), signal to interference plus noise ratio (SINR), reference signal strength indication (RSSI), or other signal quality.
  • the cell quality can be at the cell level, beam level, synchronization signal/physical broadcast channel block level, channel-state information reference signal (CSI-RS) level, air interface technology (numerology) level, At least one of slicing level or bandwidth part (BWP) level.
  • CSI-RS channel-state information reference signal
  • BWP bandwidth part
  • the quality of the cell can be measured by measuring the downlink synchronization channel, channel state information reference signal, demodulation reference signal (DMRS), cell-specific reference signal (CRS) signal, synchronization signal (synchronization signal, SS), Obtained at least one of synchronization signal/physical broadcast channel block (SS/PBCH Block) or other downlink signals. It is understandable that if the cell quality information is at the beam level, at the synchronization signal/physical broadcast channel block level, at the channel state information reference signal level, at the air interface technology level, at the slice level, or at the partial bandwidth level, the cell information is again It may include at least one of corresponding beam, synchronization signal/physical broadcast channel block, channel state information reference signal, air interface technology, slice, or identification information of part of the bandwidth.
  • DMRS demodulation reference signal
  • CRS cell-specific reference signal
  • the at least one point in time may be: the point in time when the terminal device receives the first message, the point in time when the terminal device detects that the connection with the source network device fails, the point in time when the terminal device accesses the target network device, and the conditions One or more of the time point when the triggering condition of the handover is satisfied, and the time point when the terminal device sends the first report.
  • the time point when the terminal device accesses the target network device may include the time point when the random access procedure is successful, or the time point when the terminal device sends a handover completion message to the target network device.
  • the first report may also include handover type information, which is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover.
  • handover type information is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover.
  • the first report may also include random access information of the terminal device on the target network device.
  • the random access information may include the number of times the terminal device sends the preamble, whether it reaches the maximum number of preamble transmissions, whether the transmission power of the terminal device reaches the maximum value when the preamble is sent for the last time, or whether the difference between the terminal device and the maximum value is less than or equal to a certain threshold, At least one of information such as whether a conflict is detected, whether the cell or beam quality is higher than a certain threshold, whether the two-step random access process falls back to the four-step random access process, and uplink carrier information.
  • the preamble may be message 1 (msg1), and for the two-step random access procedure, the preamble may be message A (msgA).
  • the uplink carrier information is used to indicate the uplink carrier corresponding to the random access information.
  • the uplink carrier information can be used to indicate whether the corresponding uplink carrier is NR UL or a supplementary uplink carrier, or the uplink carrier information can be used by network equipment to determine its frequency. information.
  • the random access information can be at least one of cell level, beam level, synchronization signal/physical broadcast channel block level, channel state information reference signal level, air interface technology level, slice level, or partial bandwidth level. . It is understandable that the random access information may include at least one of corresponding beam, synchronization signal/physical broadcast channel block, channel state information reference signal, air interface technology, slice, or identification information of part of the bandwidth.
  • the first report may further include sixth indication information, which indicates whether the connection between the terminal device and the source network device fails when the terminal device receives the first release message from the target network device .
  • the first release message is used to instruct the terminal device to release the connection with the source network device.
  • the sixth indication information can also be understood as indicating that the connection failure between the terminal device and the source network device occurred before the terminal device received the first release message from the target network device, or used to instruct the terminal device to receive the first release message from the target network device. Before the target network device receives the first release message, the connection between the terminal device and the source network device does not fail.
  • the terminal device may generate the above-mentioned first report according to one or more kinds of information during the handover process from the source network device to the target network device before performing step S204.
  • the first report may be at least one of a radio link failure RLF report, an establishment failure report, a recovery failure report, and a handover success report.
  • Step S205 The third network device receives the first report from the terminal device.
  • the first report may be transmitted between the CU node and the DU node, may also be transmitted between network devices, or may be transmitted between the network device and the network device. Transmission between core network devices is not limited in this application.
  • the CU node in the third network device may receive the first report from the terminal device.
  • the CU node may also send part or all of the information included in the first report to the DU node.
  • the CU node can be divided into the control plane (CU-CP) and the user plane (CU-UP), it can also include the CU-CP node and send part or all of the information included in the first report to the CU-UP node .
  • the third network device may send the first report to other required network devices.
  • the third network device may send the first report to the source network device and/or the target network device.
  • Step S206 The third network device sends the first report to the source network device and/or the target network device.
  • the third network device may send part or all of the information included in the first report to the source network device.
  • the third network device may also send the type information of the first report to the source network device.
  • the third network device may send part or all of the information of the first report to the source network device through the interface between the base station and the base station.
  • the interface between the third network device and the source network device may be an X2 interface or an Xn interface.
  • the third network device may send part or all of the information of the first report to the source network device through a failure indication (FAILURE INDICATION, RLF INDICATION) message, a handover report (HANDOVER REPORT) message, or other messages.
  • FAILURE INDICATION, RLF INDICATION failure indication
  • HANDOVER REPORT handover report
  • the third network device may send part or all of the information of the first report to the source network device through the core network device.
  • the third network device may also send the type information of the first report to the source network device. For example, sending part or all of the information of the first report to the core network equipment through the interface between the base station and the core network equipment; specifically, the third network equipment sends part or all of the information of the first report to the core network equipment through the S1 or NG interface , The core network device forwards the information received from the third network device to the source network device.
  • the third network device may send part or all of the information of the first report to the source network device through the following messages on the S1/NG interface: uplink RAN configuration transmission (UPLINK RAN configuration TRANSFER) message, downlink RAN configuration transmission (DOWNLINK RAN) CONFIGURATION TRANSFER) message, base station configuration transmission (eNB CONFIGURATION TRANSFER) message, core network equipment configuration transmission (MME CONFIGURATION TRANSFER) message, or other messages.
  • uplink RAN configuration transmission UPLINK RAN configuration TRANSFER
  • DOWNLINK RAN downlink RAN configuration transmission
  • eNB CONFIGURATION TRANSFER base station configuration transmission
  • MME CONFIGURATION TRANSFER core network equipment configuration transmission
  • the foregoing implementation manner of sending the first report by the third network device to the source network device can be applied to the step of sending the first report between any two network devices in the embodiment of the present application.
  • the implementation manner of the network device that sends the first report reference may be made to the description of the foregoing third network device, and the implementation manner of the network device that receives the first report may generate the foregoing description of the source network device.
  • the third network device may send part or all of the information included in the first report to the target network device in the foregoing manner.
  • the target network device may send part or all of the information included in the first report to the source network device in the foregoing manner.
  • the CU node in the source network device or the target network device may receive the first report from the terminal device.
  • the CU node may also send part or all of the information included in the first report to the DU node.
  • the CU node can be divided into the control plane (CU-CP) and the user plane (CU-UP), it can also include the CU-CP node and send part or all of the information included in the first report to the CU-UP node .
  • the third network device or the target network device when it sends part or all of the information of the first report to the source network device, it may also send the handover type information to the source network device.
  • the handover type information is used to indicate the mobility type of the terminal device when the connection fails.
  • the handover type information can be any of DAPS handover (handover, HO) too late, DAPS HO too early, DAPS HO to the wrong cell, DAPS CHO too late, DAPS CHO too early, or DAPS CHO to the wrong cell.
  • the source network device, the target network device, and the third network device may be the same system, different systems, the same standard, different standards, and the same system and different standards. It is understandable that the corresponding switching type information can also be used to indicate system and/or standard information. As an example, the handover type information may be that DAPS under the different system is too early.
  • the report recorded by the terminal device is the first report of the first system or the first standard
  • the terminal device when the terminal device sends the first report through the second system or the second network device under the second standard, the first report It may be sent to the second network device under the second system or the second standard in the form of a container.
  • the terminal device may carry the information of the cell corresponding to the report outside the container for the second network device to determine the target network device to forward the report according to the information of the cell.
  • the information of the cell may be the information of the source cell or the information of the target cell.
  • the information of the cell may be the information of the source cell.
  • the third network device may determine to send the first report to the source network device based on the information of the source cell.
  • the terminal device may also receive third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • the source network device may send the third instruction information to the terminal device before sending the first message, or it may send the third instruction information at the same time as the first message, for example, the third instruction information is carried in the first message and sent To the terminal equipment.
  • the source network device may receive capability information of the terminal device, where the capability information is used to indicate that the terminal device supports recording of DAPS scenarios or DAPS and CHO scenarios The first report.
  • the source network device may receive the foregoing capability information sent from the terminal device or other network devices or core network devices.
  • the third indication information may have multiple possible implementation manners.
  • the third indication information can be used to indicate whether the first report needs to be recorded when the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device; or the third indication information is also available To indicate whether the first report needs to be recorded when the connection failure between the terminal device and the source network device occurs after the terminal device is connected to the target network device; or, the third indication information can also be used to indicate that the terminal device When the target network device receives the first release message, if the connection between the terminal device and the source network device does not fail, whether the first report needs to be recorded; or, the third indication information can also be used to indicate that the handover type is In the case of the combination of DAPS handover and conditional handover, whether the first report needs to be recorded; or, the third indication information can also be used to indicate that when the handover type is DAPS handover, the connection between the terminal device and the source network device fails If it happened before the first time point, whether the first report needs to be recorded.
  • the terminal device can record the connection failure information of the terminal device and the source network device in the DAPS switching scenario and send it to the network device, so that the network device can determine the DAPS switching instruction Whether the transmission is too late, and whether the DAPS handover-related mobility parameters are likely to cause potential DAPS handover command transmission failure problems, so as to adjust the corresponding DAPS handover mobility parameter configuration to improve the subsequent handover success rate.
  • the first report provided in the embodiment of the present application may include multiple types of information elements, so as to realize the information recording of the connection failure between the terminal device and the source network device in the DAPS handover scenario, and improve the applicability of the method.
  • FIG. 6 is a schematic flowchart of another communication method provided by an embodiment of this application. The method includes the following steps:
  • Step S601 The terminal device receives a first message from the source network device, where the first message is used to switch the terminal device from the source network device to the target network device.
  • Step S602 The terminal device maintains data transmission with the source network device.
  • Step S603 The terminal device successfully accesses the target network device.
  • the fact that the terminal device can access the target network device may include that the random access procedure performed by the terminal device to the target network device succeeds, or the terminal device sends a handover complete message to the target network device.
  • Step S604 The terminal device receives a first release message from the target network device, where the first release message is used to instruct the terminal device to release the connection with the source network device.
  • Step S605 The terminal device sends a first report to the third network device, where the first report includes fourth indication information and/or eighth time period information.
  • the fourth indication information is used to determine whether a connection failure occurs between the terminal device and the source network device.
  • the eighth time period information is used to indicate the time period from when the terminal device receives the first message to when the terminal device receives the first release message from the target network device, and the time period corresponds to the time period T8 shown in FIG. 6 .
  • Step S606 The third network device receives the first report from the terminal device.
  • Step S607 The third network device sends the first report to the source network device and/or the target network device.
  • the foregoing method may further include step S600, that is, the source network device and the target network device perform a handover procedure.
  • step S600 to step S607 is similar to that of the foregoing step S201 to step S206, and the repetition is not repeated here.
  • the connection between the terminal device and the source network device does not fail, and after the terminal device receives the first message, the random access procedure to the target network device performed is also successful. That is, the terminal device successfully establishes a connection with the target network device, and there is no connection failure with the target network device.
  • the first report provided in the embodiment of the present application may also be referred to as a handover success report.
  • the foregoing method may be applied to a DAPS switching scenario, or a scenario where DAPS switching and conditional switching are combined. That is, the terminal device may receive the conditional switching configuration information from the source network device, and the conditional switching configuration information includes the triggering condition of the conditional switching and at least one candidate target network device. If the trigger condition is met, the terminal device can determine a target network device from at least one candidate target network device, and then perform a random access process to the target network device.
  • the first report may also include information about the source network device and/or the target network device.
  • the first report may include one or more of the following information: cell information of the source network device and/or target network device, cell quality information corresponding to the source network device and/or target network device at at least one point in time . In this way, it is convenient for the network device to determine whether the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the at least one point in time may include the point in time when the terminal device receives the first message, the point in time when the terminal device successfully accesses the target network device, and the point in time when the terminal device receives the first release message from the target network device.
  • the first report may also include random access information of the terminal device on the target network device.
  • random access information For the description of the specific random access information, please refer to the above description, which will not be repeated here. In this way, it is convenient for the target network device to determine whether the random access parameters are reasonable according to the random access information in the first report.
  • the first report may also include handover type information, which is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover. So that the network device can further identify the handover parameters that need to be adjusted according to the handover type information.
  • handover type information is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover.
  • the terminal device may also receive third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • third indication information is used to indicate whether the first report needs to be recorded.
  • the terminal device can also record various information during the handover process (such as the fourth indication information or the fourth indication information or The eighth time period information or the cell quality information of the source and target at each key time point in the handover process, etc.) generate the first report and send it to the source network device (either directly or indirectly), so that the source network device can determine Whether there are possible switching scenarios, so as to configure the switching parameters more reasonably.
  • various information during the handover process such as the fourth indication information or the fourth indication information or The eighth time period information or the cell quality information of the source and target at each key time point in the handover process, etc.
  • FIG. 7 is a schematic flowchart of a communication method provided by an embodiment of this application. The method includes the following steps:
  • Step S701 The terminal device receives a first message from the source network device, where the first message is used to switch the terminal device from the source network device to the target network device.
  • Step S702 The terminal device maintains data transmission with the source network device.
  • step S703 the terminal device detects that the connection with the source network device fails.
  • Step S704 The terminal device detects that the connection with the target network device fails.
  • the failure of the connection between the terminal device and the target network device may include the failure of the connection between the terminal device and the target network device in a short time or soon after the terminal device successfully establishes a connection with the target network device; or, it may include access Failure means that the terminal device failed to successfully establish a connection with the target network device.
  • the access failure may refer to a failure of the random access process, or the terminal device cannot successfully send a reconfiguration complete message to the target network device.
  • step S704 can be performed after step S703. , It can also be executed before step S703.
  • S704 is executed after S703, that is, when the connection between the terminal device and the target network device fails, the source network device has already experienced RLF, and at this time, the terminal device initiates the RRC re-establishment process.
  • S704 is executed before S703.
  • the following four scenarios can be included:
  • Scenario 1 The access between the terminal device and the target network device fails. For example, the random access process between the terminal device and the target cell fails. If the terminal device detects that the cell of the source network device is unavailable at this time, for example, the terminal device and the source network device are not available. If RLF occurs on the inter-link, the terminal device executes the RRC re-establishment procedure.
  • Scenario 2 The access between the terminal device and the target network device fails, for example, the random access process between the terminal device and the target cell fails, if the terminal device detects that the cell of the source network device is available at this time, for example, between the terminal device and the source network device If RLF does not occur on the link, the terminal device can perform connection recovery with the source network device. In an example, the connection between the terminal device and the source network device is restored successfully. For example, the terminal device can send information to the source network device to indicate that the access between the terminal and the target network device fails, and the terminal device and the source network device perform Communication.
  • Scenario 3 The access between the terminal device and the target network device fails, for example, the random access process between the terminal device and the target cell fails, if the terminal device detects that the cell of the source network device is available at this time, for example, between the terminal device and the source network device If RLF does not occur on the link, the terminal device can perform connection recovery with the source network device. In one example, the connection between the terminal device and the source network device fails to recover. For example, the terminal device cannot resume using the DRB and/or SRB configuration on the source network device side, or the terminal device cannot send information to the source network device to instruct the terminal If the access with the target network device fails, the terminal device executes the RRC re-establishment procedure.
  • the terminal device fails to access the target network device. For example, the random access process between the terminal device and the target cell fails. If the terminal device detects that the cell of the source network device is available at this time, for example, between the terminal device and the source network device If RLF does not occur on the link, the terminal device can perform connection recovery with the source network device. In an example, after the connection between the terminal device and the source network device is restored successfully, after a period of time, the terminal device detects that the connection with the source network device fails, for example, the terminal device detects a connection with the source network device If it fails, such as RLF, the terminal device executes the re-establishment procedure.
  • Step S705 The terminal device sends the first report to the third network device.
  • the first report may include one or more of the following information: fifth indication information, third time period information, fifth time period information, ninth time period information, tenth time period information, eleventh time Segment information, twelfth time segment information, seventh indication information.
  • the fifth indication information is used to determine whether the connection between the terminal device and the source network device and the connection between the terminal device and the target network device have failed.
  • the information included in the first report may be different, and the function or content of the seventh indication information may also be different.
  • the function or content of the seventh indication information may also be different.
  • the first report includes one or more of the following information: fifth indication information, tenth time period information, seventh indication information, the terminal device detects the connection with the target network device The time period between the failure and when the terminal device initiates the RRC re-establishment procedure.
  • the seventh indication information is used to indicate that the connection between the terminal device and the source network device fails to be restored.
  • the first report includes one or more of the following information: fifth indication information, tenth time period information, seventh indication information, and the terminal device detects the connection with the target network device The time period between the failure and the successful restoration of the connection between the terminal device and the source network device.
  • the seventh indication information is used to indicate that the connection between the terminal device and the source network device is restored successfully.
  • the first report includes one or more of the following information: fifth indication information, tenth time period information, seventh indication information, and eleventh time period information.
  • the seventh indication information is used to indicate that the connection between the terminal device and the source network device fails to be restored.
  • the first report includes one or more of the following information: fifth indication information, tenth time period information, eleventh time period information, twelfth time period information, seventh indication information.
  • the seventh indication information is used to indicate that after the connection between the terminal device and the source network device is successfully restored, the source network device has failed to connect, such as RLF, and the twelfth time period information is used to indicate that the terminal device has detected a connection with the source network device. The time period between the connection failure and the terminal device sending the first report.
  • the ninth time period The information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device detecting the connection failure with the target network device. This time period may correspond to the time period shown in FIG. 7 Time period T9.
  • the first report may also include one or more of the following information: fifth indication information, tenth time period information, and seventh indication information.
  • the seventh indication information is used to indicate that the connection recovery between the terminal device and the source network device fails or the terminal device does not perform connection recovery with the source network device.
  • the third time period information is used to indicate the time period from when the terminal device detects that the connection with the source network device fails to when the terminal device accesses the target network device;
  • the ninth time period information It is used to indicate the time period from when the terminal device accesses the target network device to when the terminal device detects that the connection with the target network device fails.
  • the tenth time period information is used to indicate the time period between the terminal device detecting the connection failure with the target network device and the terminal device sending the first report, and the time period may correspond to the time period T10 shown in FIG. 7.
  • the eleventh time period information is used to instruct the terminal device to detect the connection failure with the target network device. The time period between when the connection fails and the terminal device detects the connection failure with the source network device.
  • the fifth time period information is used to indicate the time period between when the terminal device receives the first message and the terminal device accesses the target network device; the eleventh time period information is used to indicate the terminal device The period of time between when the target network device is connected to when the terminal device detects that the connection with the target network device fails.
  • a scenario of "the terminal device detects the connection failure between the source network device and the target network device after detecting the connection failure with the target network device” may be: after the terminal device detects the connection failure with the target network device, For example, when access fails, the terminal device attempts to restore the connection with the source network device.
  • the terminal device detects the connection failure between the source network device can be the connection between the terminal device and the source network device. Recovery fails, or after the connection between the terminal device and the source network device is restored successfully, the terminal device detects that the connection with the source network device fails, for example, the terminal device detects a connection failure with the source network device, such as RLF .
  • Step S706 The third network device receives the first report from the terminal device.
  • Step S707 The third network device sends the first report to the source network device and/or the target network device.
  • the foregoing method may further include step S700, that is, the source network device and the target network device perform a handover procedure.
  • the connection between the terminal device and the source network device fails, and the connection between the terminal device and the target network device fails within a short time or soon after the connection is successfully established, or The terminal device failed to successfully establish a connection with the target network device.
  • the first report provided in the embodiment of the present application may also be referred to as a handover failure report.
  • the foregoing method may be applied to a DAPS switching scenario, or a scenario where DAPS switching and conditional switching are combined. That is, the terminal device may receive the conditional switching configuration information from the source network device, and the conditional switching configuration information includes the triggering condition of the conditional switching and at least one candidate target network device. If the trigger condition is met, the terminal device can determine a target network device from at least one candidate target network device, and then perform a random access process to the target network device.
  • the first report may also include information about the source network device and/or the target network device.
  • the first report may include one or more of the following information: cell information of the source network device and/or target network device, cell quality information corresponding to the source network device and/or target network device at at least one point in time . In this way, it is convenient for the network device to determine whether the configuration of the handover parameter is reasonable according to the cell information and cell quality information in the first report.
  • the at least one point in time may include the point in time when the terminal device receives the first message, the point in time when the terminal device detects that the connection with the source network device fails, and the point in time when the terminal device The time point when the device detects that the connection with the target network device fails, the time point when the trigger condition of the condition switch is met (that is, the time point when the condition switch is triggered), and the time point when the terminal device sends the first report one or more.
  • the first report may also include random access information of the terminal device on the target network device.
  • random access information For the description of the specific random access information, please refer to the above description, which will not be repeated here. In this way, it is convenient for the target network device to determine whether the random access parameters are reasonable according to the random access information in the first report.
  • the first report may also include handover type information, which is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover. So that the network device can further identify the handover parameters that need to be adjusted according to the handover type information.
  • handover type information is used to indicate any handover type among ordinary handover, dual activation protocol stack DAPS handover, conditional handover, and a combination of DAPS handover and conditional handover.
  • the terminal device may also receive third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • third indication information is used to indicate whether the first report needs to be recorded.
  • the terminal device when the terminal device fails to connect to the source network device, and the connection between the terminal device and the target network device fails, it can also record various information during the switching process (such as The fifth indication information or at least one period of time information or cell quality information of the source and target at each key time point in the handover process, etc.) generates a first report and sends it to the third network device, so that the network device can determine whether there is Possible switching scenarios, so as to configure the switching parameters more reasonably.
  • various information during the switching process such as The fifth indication information or at least one period of time information or cell quality information of the source and target at each key time point in the handover process, etc.
  • the steps or operations implemented by the terminal device can also be implemented by components that can be configured on the terminal device
  • the steps or operations implemented by the network device can also be implemented by the steps or operations that can be configured on the network device.
  • the steps or operations implemented by the core network equipment can also be implemented by the components configurable in the core network equipment.
  • FIG. 8 is a schematic structural diagram of a communication device provided in an embodiment of this application.
  • the communication device 800 includes a transceiver module 810 and a processing module 820.
  • the communication device can be used to implement the functions related to terminal equipment in any of the foregoing method embodiments.
  • the communication device may be a terminal device, such as a handheld terminal device or a vehicle-mounted terminal device; the communication device may also be a chip included in the terminal device, or a device including the terminal device, such as various types of vehicles.
  • the transceiver module 810 is configured to receive a first message from the source network device, and the first message is used to enable the communication device to be used by The source network device switches to the target network device; the processing module 820 is used to maintain the data transmission between the communication device and the source network device after the transceiver module 810 receives the first message; the processing module 820 is also used to detect The connection between the communication device and the source network device fails; the transceiver module 810 is further configured to send a first report to the third network device, the first report includes first indication information, and the first indication information is used to determine Whether the connection failure between the communication device and the source network device occurs before the terminal device accesses the target network device.
  • the processing module 820 is specifically configured to detect that the connection between the communication device and the source network device fails before the communication device accesses the target network device.
  • the first report may also include one or more of the following time period information: first time period information, the first time period information is used to indicate that the communication device receives the first message to the communication device to detect The time period between the failure of the connection with the source network device; the second time period information, the second time period information is used to indicate that the communication device detects that the connection with the source network device fails to be sent to the communication device The time period between the first report; the third time period information, the third time period information is used to indicate that the communication device detects a connection failure with the source network device until the communication device connects to the target network device The fourth time period information, the fourth time period information is used to indicate the time period between when the communication device accesses the target network device and when the communication device sends the first report.
  • the processing module 820 is specifically configured to detect that the connection between the communication device and the source network device fails after the communication device accesses the target network device.
  • the first report may also include one or more of the following time period information: first time period information, the first time period information is used to indicate that the communication device receives the first message to the communication device to detect The time period between the failure of the connection with the source network device; the second time period information, the second time period information is used to indicate that the communication device detects that the connection with the source network device fails to be sent to the communication device The time period between the first report; the fourth time period information, where the fourth time period information is used to indicate the time period between when the communication device accesses the target network device and when the communication device sends the first report; the fifth time Period information, the fifth time period information is used to indicate the time period between when the communication device receives the first message and the communication device accesses the target network device; the sixth time period information, the sixth time period information is used for Indicate the time period from when the
  • the transceiver module 810 is further configured to receive conditional switching configuration information from the source network device, and the conditional switching configuration information includes the triggering condition of the conditional switching and at least one candidate target network device; if the conditional switching is triggered When the condition is satisfied, the processing module 820 is further configured to determine a target network device from the at least one candidate target network device;
  • the first report may further include second indication information, where the second indication information is used to indicate that the communication device detects that the connection between the communication device and the source network device fails before the trigger condition of the condition switch is satisfied .
  • the second indication information may also be used to indicate that the communication device detects that the connection between the communication device and the source network device fails after the triggering condition of the condition switch is met and before accessing the target network device, or The second indication information may also be used to indicate that the communication device detects that the connection between the communication device and the source network device fails after the trigger condition of the condition switch is satisfied and the communication device is connected to the target network device.
  • the first report also includes one or more of the following information: cell information of the source network device and/or target network device, the source network device and/or target network device at least one time The quality information of the cell corresponding to the point.
  • the first report may also include information at the above at least one point in time, and the at least one point in time includes one or more of the following points in time: the point in time when the communication device receives the first message , The time point when the communication device detects the connection failure with the source network device, the time point when the communication device accesses the target network device, the time point when the trigger condition of the condition switch is met, the communication device sends the first The time point of the report.
  • the first report may also include handover type information, which is used to indicate any of ordinary handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch. kind of switching type.
  • the transceiver module 810 is further configured to receive third indication information from the source network device, where the third indication information is used to indicate whether the first report needs to be recorded.
  • the third indication information may be specifically used to indicate whether it is necessary to record the first communication device if the connection failure between the communication device and the source network device occurs before the communication device accesses the target network device.
  • a report; or, the third indication information may be specifically used to indicate whether the first report needs to be recorded when the connection failure between the communication device and the source network device occurs after the communication device is connected to the target network device;
  • the third indication information may also be specifically used to indicate whether the communication device needs to record if the connection between the communication device and the source network device does not fail when the communication device receives the first release message from the target network device
  • the first report; or, the third indication information may also be specifically used to indicate whether the first report needs to be recorded when the handover type is a combination of DAPS handover and conditional handover; or, the third indication information may also be specifically used for Indicate whether the first report needs to be recorded when the connection failure between the communication device and the source network device occurs before the first time point when the handover type is DAPS handover.
  • the processing module 820 involved in the communication device may be implemented by at least one processor or processor-related circuit component, and the transceiver module 810 may be implemented by at least one transceiver or transceiver-related circuit component or a communication interface.
  • the operation and/or function of each module in the communication device is to implement the corresponding process of the method shown in FIG. 2, FIG. 3, FIG. 4, FIG. 6 or FIG.
  • the communication device may further include a storage module, and the storage module may be used to store data and/or instructions.
  • the transceiver module 810 and/or the processing module 820 may read the data and/or instructions in the access module. So that the communication device implements the corresponding method.
  • the storage module may be realized by at least one memory, for example.
  • the foregoing storage module, processing module, and transceiver module may exist separately, or all or part of the modules may be integrated, for example, the storage module and the processing module are integrated, or the processing module and the transceiver module are integrated.
  • FIG. 9 is a schematic diagram of another structure of a communication device provided in an embodiment of this application.
  • the communication device may specifically be a terminal device. It is easy to understand and easy to illustrate.
  • the terminal device uses a mobile phone as an example.
  • the terminal equipment includes a processor, and may also include a memory. Of course, it may also include a radio frequency circuit, an antenna, an input and output device, and so on.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 9 only one memory and processor are shown in FIG. 9. In an actual terminal device product, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device
  • the processor with the processing function can be regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiving unit 910 and a processing unit 920.
  • the transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, and so on.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiving unit 910 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiving unit 910 can be regarded as the sending unit, that is, the transceiving unit 910 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving unit 910 is configured to perform sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing unit 920 is configured to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • FIG. 10 is a schematic structural diagram of a communication device provided in an embodiment of this application.
  • the communication device 1000 includes a transceiver module 1010 and a processing module 1020.
  • the communication device can be used to implement the functions related to the network equipment in any of the foregoing method embodiments.
  • the communication device may be a network device or a chip included in the network device.
  • the transceiver module 1010 is configured to receive a first report from a terminal device, and the first report includes first indication information.
  • the first indication information is used to determine whether the connection failure between the terminal device and the source network device occurs before the terminal device accesses the target network device; the processing module 1020 is used to send the first report to the source network device through the transceiver module 1010 .
  • the connection failure between the terminal device and the source network device may occur before the terminal device accesses the target network device; accordingly, the first report may also include one of the following time period information: Item or more:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the third time period information is used to indicate the time period between the terminal device detecting the connection failure with the source network device and the terminal device accessing the target network device; the fourth time period Segment information, where the fourth time period information is used to indicate the time period from when the terminal device accesses the target network device to when the terminal device sends the first report.
  • connection failure between the terminal device and the source network device can also occur after the terminal device accesses the target network device; correspondingly, the first report also includes one of the following time period information Or multiple:
  • the first time period information is used to indicate the time period between when the terminal device receives the first message and when the terminal device detects that the connection with the source network device fails, and the first message is used to make the terminal
  • the device is switched from the source network device to the target network device; the second time period information, the second time period information is used to indicate that the terminal device detects that the connection with the source network device fails until the terminal device sends the first report
  • the fourth time period information is used to indicate the time period between the terminal device accessing the target network device and the terminal device sending the first report;
  • the fifth time period information is used to indicate the time period between when the terminal device receives the first message and the terminal device accesses the target network device;
  • the sixth information segment information is used to indicate that the terminal device accesses the target network device The time period between when the terminal device detects that the connection with the source network device fails.
  • the first report may also include second indication information; wherein, the second indication information is used to indicate that the terminal device detects the connection with the source network device before the trigger condition of the condition switch is satisfied Failed, or the second indication information is used to indicate that the terminal device detects a connection failure with the source network device after the triggering condition of the condition switch is met and before accessing the target network device, or the second indication information is used After instructing the terminal device to detect the connection failure with the source network device after the trigger condition is met and access to the target network device.
  • the second indication information is used to indicate that the terminal device detects the connection with the source network device before the trigger condition of the condition switch is satisfied Failed, or the second indication information is used to indicate that the terminal device detects a connection failure with the source network device after the triggering condition of the condition switch is met and before accessing the target network device, or the second indication information is used After instructing the terminal device to detect the connection failure with the source network device after the trigger condition is met and access to the target network device.
  • the first report may also include one or more of the following information: cell information of the source network device and/or target network device, the source network device and/or target network device in at least one Cell quality information corresponding to the time point.
  • the first report further includes at least one point in time information, and the at least one point in time includes one or more of the following points in time: the point in time when the terminal device receives the first message, and the point in time when the terminal device receives the first message.
  • the first report may also include handover type information, which is used to indicate any of ordinary handover, dual activation protocol stack DAPS switch, conditional switch, and combination of DAPS switch and conditional switch. kind of switching type.
  • the processing module 1020 involved in the communication device may be implemented by at least one processor or processor-related circuit component, and the transceiver module 1010 may be implemented by at least one transceiver or transceiver-related circuit component or a communication interface.
  • the operation and/or function of each module in the communication device is to implement the corresponding process of the method shown in FIG. 2, FIG. 3, FIG. 4, FIG. 6 or FIG.
  • the communication device may further include a storage module, and the storage module may be used to store data and/or instructions.
  • the transceiver module 1010 and/or the processing module 1020 may read the data and/or instructions in the access module. So that the communication device implements the corresponding method.
  • the storage module may be realized by at least one memory, for example.
  • the foregoing storage module, processing module, and transceiver module may exist separately, or all or part of the modules may be integrated, for example, the storage module and the processing module are integrated, or the processing module and the transceiver module are integrated.
  • FIG. 11 is a schematic diagram of another structure of a communication device provided in an embodiment of this application.
  • the communication device may be specifically a type of network equipment, such as a base station, for implementing the functions of the network equipment in any of the foregoing method embodiments.
  • the network equipment includes: one or more radio frequency units, such as remote radio unit (RRU) 1101 and one or more baseband units (BBU) (also called digital unit, digital unit, DU) ) 1102.
  • the RRU 1101 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 11011 and a radio frequency unit 11012.
  • the RRU 1101 part is mainly used for receiving and sending radio frequency signals and converting radio frequency signals and baseband signals.
  • the 1102 part of the BBU is mainly used for baseband processing, control of the base station, and so on.
  • the RRU 1101 and the BBU 1102 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 1102 is the control center of the base station, and may also be referred to as a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU (processing unit) 1102 may be used to control the base station to execute the operation flow of the network device in the foregoing method embodiment.
  • the BBU 1102 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access indication (such as an LTE network), and may also support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 1102 may also include a memory 11021 and a processor 11022, where the memory 11021 is used to store necessary instructions and data.
  • the processor 11022 is used to control the base station to perform necessary actions, for example, to control the base station to perform the sending operation in the foregoing method embodiment.
  • the memory 11021 and the processor 11022 may serve one or more boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • FIG. 12 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1200 includes a transceiver module 1210 and a processing module 1220.
  • the communication device can be used to implement the functions related to the core network equipment in any of the foregoing method embodiments.
  • the communication device may be a chip included in a network device or a core network device.
  • the transceiver module 1210 is used to receive the first report from the third network device; the processing module 1220 is used to send the source network device to the source network device through the transceiver module 1210.
  • Send the first report, and the first report may be any of the first reports described in the foregoing method embodiments.
  • the transceiver module 1210 is further configured to send capability information of the terminal device to the source network device, where the capability information is used to indicate whether the terminal device supports recording the first report.
  • FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • the communication device 1300 may be used to implement the method executed by the core network device described in the foregoing method embodiment.
  • the communication device 1300 may be a chip or a core network device.
  • the communication device 1300 includes one or more processors 1301, and the one or more processors 1301 can support the communication device 1300 to implement the method of the core network device in the foregoing method embodiment.
  • the processor 1301 may be a general-purpose processor or a special-purpose processor.
  • the processor 1301 may be a central processing unit (CPU) or a baseband processor.
  • the baseband processor may be used to process communication data, and the CPU may be used to control a communication device (for example, a network device, a terminal device, or a chip), execute a software program, and process data of the software program.
  • the communication device 1300 may further include a transceiving unit 1305 to implement signal input (reception) and output (transmission).
  • the communication device 1300 may be a chip, and the transceiver unit 1305 may be an input and/or output circuit of the chip, or the transceiver unit 1305 may be a communication interface of the chip, and the chip may be used as a terminal device or a network device or other wireless communication. Components of equipment.
  • the communication device 1300 may include one or more memories 1302 with a program 1304 stored thereon.
  • the program 1304 can be run by the processor 1301 to generate instructions 1303 so that the processor 1301 executes the methods described in the foregoing method embodiments according to the instructions 1303.
  • the memory 1302 may also store data.
  • the processor 1301 may also read data stored in the memory 1302. The data may be stored at the same storage address as the program 1304, or the data may be stored at a different storage address from the program 1304.
  • the processor 1301 and the memory 1302 may be provided separately or integrated together, for example, integrated on a single board or a system-on-chip (SOC).
  • SOC system-on-chip
  • the communication device 1300 may further include a transceiver unit 1305 and an antenna 1306.
  • the transceiver unit 1305 may be called a transceiver, a transceiver circuit, or a transceiver, and is used to implement the transceiver function of the communication device through the antenna 1306.
  • An embodiment of the present application also provides a chip system, including: a processor, the processor is coupled with a memory, the memory is used to store a program or instruction, when the program or instruction is executed by the processor, the The chip system implements the method in any of the foregoing method embodiments.
  • processors in the chip system there may be one or more processors in the chip system.
  • the processor can be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application.
  • the memory may be a non-transitory processor, such as a read-only memory ROM, which may be integrated with the processor on the same chip, or may be set on different chips.
  • the setting method of the processor is not specifically limited.
  • the chip system may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC). It can also be a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (microcontroller).
  • the controller unit, MCU may also be a programmable controller (programmable logic device, PLD) or other integrated chips.
  • each step in the foregoing method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the embodiment of the present application also provides a computer-readable storage medium, which stores computer-readable instructions, and when the computer reads and executes the computer-readable instructions, the computer is caused to execute any of the above-mentioned method embodiments In the method.
  • the embodiments of the present application also provide a computer program product.
  • the computer reads and executes the computer program product, the computer is caused to execute the method in any of the foregoing method embodiments.
  • An embodiment of the present application also provides a communication system, which includes a terminal device and a third network device.
  • the communication system may also include a source network device and a target network device.
  • the third network device may be the same network device as the source network device or the target network device, and the third network device may also be different from Other network devices of the source network device and the target network device.
  • the communication system may also include core network equipment.
  • processors mentioned in the embodiments of this application may be a central processing unit (central processing unit, CPU), or other general-purpose processors, digital signal processors (digital signal processors, DSP), and application-specific integrated circuits ( application specific integrated circuit (ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • CPU central processing unit
  • DSP digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM, DR RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component
  • the memory storage module
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely 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 may 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.
  • the functional units in the various embodiments 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 the present 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 methods described in the various embodiments 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 .

Abstract

一种通信方法及装置，该方法包括：从源网络设备接收用于使得终端设备由源网络设备切换到目标网络设备的第一消息后，保持与源网络设备之间的数据传输，后续若检测到终端设备与源网络设备之间的连接失败，则发送第一报告，该第一报告中包括用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前的第一指示信息。由此可见，终端设备可记录与源网络设备之间的连接失败有关的信息，并通过第一报告将这些信息发送给网络设备，如此，可使网络设备根据这些信息，识别潜在的切换问题场景，从而更好地调整切换参数或更合理的触发切换，提高终端设备的切换成功率。

Description

通信方法及装置 技术领域
本申请涉及无线通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在切换过程中，终端设备收到切换命令后，终端设备断开和源网络设备的连接，尝试和目标网络设备建立连接。为了避免由于网络设备对切换参数配置不合理造成的连接失败，无线通信系统中可引入移动鲁棒性优化(mobility robustness optimisation，MRO)机制。MRO机制是指，终端设备通过记录在移动性过程中发生移动性失败(比如无线链路失败(radio link failure，RLF)，或者切换失败(handover failure，HOF))过程中的参数，生成RLF报告，并将RLF报告发送至网络设备，终端设备可向网络设备上报其移动性失败过程中的参数，从而使得网络设备能够识别其移动性参数的配置问题，并及时优化移动性相关参数。
然而，在双激活协议栈(dual active protocol stack，DAPS)切换场景下，终端设备在接收到切换命令后，依然保持和源网络设备的连接，同时尝试和目标网络设备建立连接。因此可以认为在DAPS切换场景下，终端设备和源网络设备以及目标网络设备分别建立连接。当其中的一个连接发生失败，终端设备还可以使用另一个连接。然而，现有的MRO机制及RLF报告无法支持网络设备对DAPS场景下移动性参数的优化。
发明内容
本申请实施例中的一种通信方法及装置，用于提供一种DAPS场景下的MRO机制，以提高终端设备的切换成功率。
第一方面，本申请实施例提供一种通信方法，该方法可由终端设备执行，也可以由可以配置于终端设备的部件(例如芯片或者电路)执行。该方法可以包括：从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；接收到第一消息后，保持终端设备与源网络设备之间的数据传输；检测到终端设备与源网络设备之间的连接失败；向网络设备发送第一报告，该第一报告中包括第一指示信息，该第一指示信息用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前。
本申请实施例中，终端设备可记录与源网络设备之间的连接失败有关的信息，并通过第一报告将这些信息发送给网络设备，如此，可使网络设备根据这些信息，识别潜在的过晚切换的场景，以更好地调整切换参数或更早的触发切换，从而提高终端设备的切换成功率。
在第一方面的一种可能的设计中，可能在终端设备接入到目标网络设备之前，检测到终端设备与源网络设备之间的连接失败；相应的，第一报告中还可包括下列时间段信息中的一项或多项：第一时间段信息，该第一时间段信息用于指示接收到第一消息至检测到终端设备与源网络设备之间的连接失败之间的时间段；第二时间段信息，该第二时间段信息用于指示检测到终端设备与源网络设备之间的连接失败至发送第一报告之间的时间段；第三时间段信息，该第三时间段信息用于指示检测到终端设备与源网络设备之间的连接失败至终端设 备接入到目标网络设备之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至发送第一报告之间的时间段。如此，可使网络设备更全面地了解在终端设备接入到目标网络设备前，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第一方面的一种可能的设计中，可能在终端设备接入到目标网络设备之后，检测到终端设备与源网络设备之间的连接失败；相应的，第一报告中还可包括下列时间段信息中的一项或多项：第一时间段信息，该第一时间段信息用于指示接收到第一消息至检测到终端设备与源网络设备之间的连接失败之间的时间段；第二时间段信息，该第二时间段信息用于指示检测到终端设备与源网络设备之间的连接失败至发送第一报告之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至发送第一报告之间的时间段；第五时间段信息，该第五时间段信息用于指示接收到第一消息至终端设备接入到目标网络设备之间的时间段；第六信息段信息，该第六时间段信息用于指示终端设备接入到目标网络设备至检测到终端设备与源网络设备之间的连接失败之间的时间段。如此，可使网络设备更全面地了解在终端设备接入目标网络设备后，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第一方面的一种可能的设计中，该方法还包括：从源网络设备接收条件切换配置信息，该条件切换配置信息包括条件切换的触发条件和至少一个候选的目标网络设备；若条件切换的触发条件被满足，从所述至少一个候选的目标网络设备中确定目标网络设备；相应的，第一报告还可包括第二指示信息，其中，该第二指示信息可用于指示在条件切换的触发条件满足前，检测到终端设备与源网络设备之间的连接失败，或者，该第二指示信息也可用于指示在条件切换的触发条件满足后且终端设备接入到目标网络设备前，检测到终端设备与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示在条件切换的触发条件满足后且终端设备接入到目标网络设备之后，检测到终端设备与源网络设备之间的连接失败。
本申请实施例中的技术方案也可以应用于条件切换的场景下，如此，该第一报告中还可包括用于指示检测到终端设备与源网络设备之间的连接失败和条件切换的触发条件被满足、终端设备接入目标网络设备等事件之间的先后关系的第二指示信息，从而更准确地反映切换过程中各关键事件之间的发生时间。
在第一方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第一方面的一种可能的设计中，第一报告中还可包括上述至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：接收到第一消息的时间点、检测到终端设备与源网络设备之间的连接失败的时间点、终端设备接入到目标网络设备的时间点、条件切换的触发条件被满足时的时间点、发送第一报告的时间点。
在第一方面的一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第一方面的一种可能的设计中，该方法还包括：从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。
在第一方面的一种可能的设计中，该第三指示信息可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前的情况下，是否需要记录第一报告；或者，第三指示信息可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在终端设备从目标网络设备接收到第一释放消息时，终端设备与源网络设备之间的连接未发生失败的情况下，是否需要记录第一报告；或者，第三指示信息还可具体用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在切换类型为DAPS切换时，终端设备与源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录第一报告。
第二方面，本申请实施例提供一种通信方法，该方法可由网络设备(例如第三网络设备)执行，也可以由配置于网络设备的部件(例如芯片或者电路)执行。该方法可以包括：从终端设备接收第一报告，该第一报告中包括第一指示信息，该第一指示信息用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前；向源网络设备发送该第一报告。
本申请实施例中，第三网络设备可将从终端设备处接收的第一报告转发给源网络设备，从而使源网络设备获知终端设备与源网络设备之间的连接失败有关的信息，根据这些信息，识别潜在的过晚切换的场景，进而更好地调整切换参数或更早的触发切换，以提高终端设备的切换成功率。
在第二方面的一种可能的设计中，终端设备与源网络设备之间的连接失败可能发生在终端设备在接入到目标网络设备之前；相应的，第一报告中还可包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第三时间段信息，该第三时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备接入到目标网络设备之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段。如此，可使源网络设备更全面地了解在终端设备接入目标网络设备前，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第二方面的一种可能的设计中，终端设备与源网络设备之间的连接失败也可能发生在终端设备接入到目标网络设备之后；相应的，第一报告中还包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第四时间段信息， 该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段；第五时间段信息，该第五时间段信息用于指示终端设备接收到第一消息至终端设备接入到目标网络设备之间的时间段；第六信息段信息，该第六时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与源网络设备之间的连接失败之间的时间段。如此，可使网络设备更全面地了解在终端设备接入目标网络设备后，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第二方面的一种可能的设计中，第一报告还可包括第二指示信息；其中，该第二指示信息可用于指示终端设备在条件切换的触发条件满足前，检测到与源网络设备之间的连接失败，或者该第二指示信息也可用于指示终端设备在条件切换的触发条件满足后且接入到目标网络设备前，检测到与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示终端设备在触发条件满足后且接入到目标网络设备之后，检测到与源网络设备之间的连接失败。
本申请实施例中的技术方案也可以应用于条件切换的场景下，如此，该第一报告中还可包括用于指示检测到终端设备与源网络设备之间的连接失败和条件切换的触发条件被满足、终端设备接入目标网络设备等事件之间的先后关系的第二指示信息，从而更准确地反映切换过程中各关键事件的发生时间。
在第二方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第二方面的一种可能的设计中，第一报告中还包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败的时间点、终端设备接入到目标网络设备的时间点、条件切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点。
在第二方面的一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第二方面的一种可能的设计中，所述向源网络设备发送第一报告可以为，向核心网设备发送该第一报告，由核心网设备将该第一报告转发给源网络设备。
第三方面，本申请实施例提供一种通信方法，该方法可由终端设备执行，也可以由可以配置于终端设备的部件(例如芯片或者电路)执行。该方法可以包括：从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；保持终端设备与源网络设备之间的数据传输；成功接入到目标网络设备；向网络设备发送第一报告，该第一报告中包括第四指示信息和/或第八时间段信息，其中，该第四指示信息用于确定终端设备与源网络设备之间是否发生连接失败，该第八时间段信息用于指示接收到第一消息至从目标网络设备接收到第一释放消息之间的时间段，该第一释放消息用于指示终端设备释放与源网络设备之间的连接。
本申请实施例中，在终端设备与源网络设备的连接没有失败，并且终端设备成功接入到 目标网络设备的场景下，终端设备也可以记录切换过程中的各项信息，例如第四指示信息和/或第八时间段信息，并通过第一报告发送给网络设备，如此可使网络设备能够确定是否存在可能的切换场景，从而更合理地配置切换参数。
在第三方面的一种可能的设计中，该方法还包括：从源网络设备接收条件切换配置信息，该条件切换配置信息中包括条件切换的触发条件和至少一个候选的目标网络设备；若条件切换的触发条件被满足，从至少一个候选的目标网络设备中确定目标网络设备。如此可知，上述技术方案也可以应用于条件切换的场景下。
在第三方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第三方面的一种可能的设计中，第一报告中还可包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一项或多项：接收到第一消息的时间点、成功接入到目标网络设备的时间点、接收到第一释放消息的时间点、条件切换的触发条件被满足时的时间点、发送第一报告的时间点。
在第三方面的一种可能的设计中，第一报告中还包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第三方面的一种可能的设计中，该方法还包括：从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。
在第三方面的一种可能的设计中，该第三指示信息可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前的情况下，是否需要记录第一报告；或者，该第三指示信息可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在终端设备从目标网络设备接收到第一释放消息时，终端设备与源网络设备之间的连接未发生失败的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在切换类型为DAPS切换时，终端设备与源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录第一报告。
第四方面，本申请实施例提供一种通信方法，该方法可由网络设备(例如第三网络设备)执行，也可以由配置于网络设备的部件(例如芯片或者电路)执行。该方法可以包括：从终端设备接收第一报告，该第一报告中包括第四指示信息和/或第八时间段信息，其中，第四指示信息用于确定终端设备与源网络设备之间是否发生连接失败，第八时间段信息用于指示终端设备接收到第一消息至终端设备从目标网络设备接收到第一释放消息之间的时间段，该第一释放消息用于指示终端设备释放与源网络设备之间的连接；向源网络设备发送该第一报告。
本申请实施例中，在终端设备与源网络设备的连接没有失败，并且终端设备成功接入到目标网络设备的场景下，终端设备也可以记录切换过程中的各项信息，例如第四指示信息和 /或第八时间段信息，并通过第一报告发送给网络设备，例如第三网络设备，相应地，该网络设备可将该第一报告转发给源网络设备，如此，可使源网络设备能够根据第一报告中包含的信息，确定是否存在可能的切换场景，从而更合理地配置切换参数。
在第四方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第四方面的一种可能的设计中，第一报告中还包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：终端设备接收到第一消息的时间点、终端设备成功接入到目标网络设备的时间点、终端设备接收到第一释放消息的时间点、条件切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点。
在第四方面的一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第四方面的一种可能的设计中，所述向源网络设备发送第一报告可以为，向核心网设备发送该第一报告，由核心网设备将该第一报告转发给源网络设备。
第五方面，本申请实施例提供一种通信方法，该方法可由终端设备执行，也可以由可以配置于终端设备的部件(例如芯片或者电路)执行。该方法可以包括：从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；保持终端设备与源网络设备之间的数据传输；检测到终端设备与源网络设备之间的连接失败；检测到终端设备与目标网络设备之间的连接失败；向网络设备发送第一报告，该第一报告中包括第五指示信息、第九时间段信息和第十时间段信息中的一项或多项，其中，第五指示信息用于确定终端设备与源网络设备之间的连接以及终端设备与目标网络设备之间的连接是否都发生失败，第九时间段信息用于指示检测到终端设备与源网络设备之间的连接失败至检测到终端设备与目标网络设备之间的连接失败之间的时间段，第十时间段信息用于指示检测到终端设备与目标网络设备之间的连接失败至发送第一报告之间的时间段。
本申请实施例中，在终端设备与源网络设备的连接发生失败，并且终端设备与目标网络设备之间的连接也发生失败的场景下，终端设备也可以记录切换过程中的各项信息，例如第五指示信息、第九时间段信息、第十时间段信息等，并通过第一报告发送给网络设备，例如第三网络设备，如此，可使网络设备能够确定是否存在可能的切换场景，从而更合理地配置切换参数。
在第五方面的一种可能的设计中，该方法还包括：从源网络设备接收条件切换配置信息，该条件切换配置信息中包括条件切换的触发条件和至少一个候选的目标网络设备；若条件切换的触发条件被满足，从至少一个候选的目标网络设备中确定目标网络设备；相应的，第一报告还可包括第二指示信息，其中，该第二指示信息可用于指示在条件切换的触发条件满足前，检测到终端设备与源网络设备之间的连接失败，或者该第二指示信息也可用于指示在条件切换的触发条件满足后且终端设备接入到目标网络设备前，检测到终端设备与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示在条件切换的触发条件满足后且 终端设备接入到目标网络设备之后，检测到终端设备与源网络设备之间的连接失败。
本申请实施例中的技术方案也可以应用于条件切换的场景下，如此，该第一报告中还可包括用于指示检测到终端设备与源网络设备之间的连接失败和条件切换的触发条件被满足、终端设备接入目标网络设备、检测到终端设备与目标网络设备之间的连接失败等事件之间的先后关系的第二指示信息，从而更准确地反映切换过程中各关键事件的发生时间。
在第五方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息，以及源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第五方面的一种可能的设计中，第一报告中还可包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一项或多项：接收到第一消息的时间点、检测到终端设备与源网络设备之间的连接失败时的时间点、检测到终端设备与目标网络设备之间的连接失败时的时间点、条件切换的触发条件被满足时的时间点、发送第一报告的时间点。
在第五方面的一种可能的设计中，第一报告中还可包括切换类型信息，所述切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第五方面的一种可能的设计中，该方法还包括：从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。
在第五方面的一种可能的设计中，第三指示信息可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前的情况下，是否需要记录第一报告；或者，该第三指示信息也可具体用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后的情况下，是否需要记录第一报告；或者，该第三指示信息还可用于具体指示在终端设备从目标网络设备接收到第一释放消息时，终端设备与源网络设备之间的连接未发生失败的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录第一报告；或者，该第三指示信息还可用于指示在切换类型为DAPS切换时，终端设备与源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录第一报告。
第六方面，本申请实施例提供一种通信方法，该方法可由网络设备(例如第三网络设备)执行，也可以由配置于网络设备的部件(例如芯片或者电路)执行。该方法可以包括：从终端设备接收第一报告，该第一报告中包括第五指示信息、第九时间段信息和第十时间段信息中的一项或多项，其中，第五指示信息用于确定终端设备与源网络设备之间的连接以及终端设备与目标网络设备之间的连接是否都发生失败，第九时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备检测到与目标网络设备之间的连接失败之间的时间段，第十时间段信息用于指示终端设备检测到与目标网络设备之间的连接失败至终端设备发送第一报告之间的时间段；向源网络设备发送该第一报告。
本申请实施例中，在终端设备与源网络设备的连接发生失败，并且终端设备与目标网络设备之间的连接也发生失败的场景下，终端设备也可以记录切换过程中的各项信息，例如第五指示信息、第九时间段信息、第十时间段信息等，并通过第一报告发送给网络设备，例如 第三网络设备，相应的，该网络设备可将该第一报告转发给源网络设备，如此，可使源网络设备能够根据第一报告中包含的信息，确定是否存在可能的切换场景，从而更合理地配置切换参数。
在第六方面的一种可能的设计中，第一报告还可包括第二指示信息；其中，该第二指示信息可用于指示终端设备在条件切换的触发条件满足前，检测到与源网络设备之间的连接失败，或者该第二指示信息也可用于指示终端设备在条件切换的触发条件满足后且接入到目标网络设备前，检测到与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示终端设备在触发条件满足后且接入到目标网络设备之后，检测到与源网络设备之间的连接失败。
本申请实施例中的技术方案也可以应用于条件切换的场景下，如此，该第一报告中还可包括用于指示检测到终端设备与源网络设备之间的连接失败和条件切换的触发条件被满足、终端设备接入目标网络设备、检测到终端设备与目标网络设备之间的连接失败等事件之间的先后关系的第二指示信息，从而更准确地反映切换过程中各关键事件的发生时间。
在第六方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第六方面的一种可能的设计中，第一报告中还包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败时的时间点、终端设备检测到与目标网络设备之间的连接失败时的时间点、条件切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点。
在第六方面的一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第六方面的一种可能的设计中，所述向源网络设备发送第一报告可以为，向核心网设备发送该第一报告，由核心网设备将该第一报告转发给源网络设备。
第七方面，本申请实施例提供一种通信方法，该方法可由核心网设备执行，也可以由配置于核心网设备的部件(例如芯片或者电路)执行。该方法可以包括：从第三网络设备接收第一报告，该第一报告中包括第一指示信息，该第一指示信息用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前；向源网络设备发送该第一报告。
本申请实施例中，核心网设备也可以从网络设备(例如第三网络设备)处接收第一报告，并将该第一报告发送给源网络设备。如此，可在第三网络设备与源网络设备之间无法直接通信的情况下，也能够实现第一报告的转发，使得源网络设备可根据该第一报告，识别潜在的过晚切换的场景，进而更好地调整切换参数或更早的触发切换，以提高终端设备的切换成功率。
在第七方面的一种可能的设计中，该方法还可包括：向源网络设备发送所述终端设备的 能力信息，所述能力信息用于指示所述终端设备是否支持记录所述第一报告。
在第七方面的一种可能的设计中，终端设备与源网络设备之间的连接失败可能发生在终端设备在接入到目标网络设备之前；相应的，第一报告中还可包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第三时间段信息，该第三时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备接入到目标网络设备之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段。如此，可使源网络设备更全面地了解在终端设备接入目标网络设备前，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第七方面的一种可能的设计中，终端设备与源网络设备之间的连接失败也可能发生在终端设备接入到目标网络设备之后；相应的，第一报告中还包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段；第五时间段信息，该第五时间段信息用于指示终端设备接收到第一消息至终端设备接入到目标网络设备之间的时间段；第六信息段信息，该第六时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与源网络设备之间的连接失败之间的时间段。如此，可使网络设备更全面地了解在终端设备接入目标网络设备后，终端设备与源网络设备发生连接失败的场景下，终端设备的切换过程中各个关键事件的发生时间。
在第七方面的一种可能的设计中，第一报告还可包括第二指示信息；其中，该第二指示信息可用于指示终端设备在条件切换的触发条件满足前，检测到与源网络设备之间的连接失败，或者该第二指示信息也可用于指示终端设备在条件切换的触发条件满足后且接入到目标网络设备前，检测到与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示终端设备在触发条件满足后且接入到目标网络设备之后，检测到与源网络设备之间的连接失败。
在第七方面的一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
在第七方面的一种可能的设计中，第一报告中还包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败的时间点、终端设备接入到目标网络设备的时间点、条件 切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点。
在第七方面的一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
在第七方面的一种可能的设计中，所述第一报告也可以为如上述第四方面或第四方面的任一种可能的设计中所述第一报告，或者为如上述第六方面或第六方面的任一种可能的设计中所述第一报告。也就是说，所述第一报告中包括的内容可以为如上述第二方面或第二方面的任一种可能的设计中的形式，也可以为如上述第四方面或第四方面的任一种可能的设计中的形式，还可以为如上述第六方面或第六方面的任一种可能的设计中的形式。
第八方面，本申请实施例还提供了一种通信方法，该方法可由终端设备执行，也可以由可以配置于终端设备的部件(例如芯片或者电路)执行。以终端设备执行为例，该方法可以包括：终端设备从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备，终端设备保持与源网络设备之间的数据传输，终端设备检测到与目标网络设备之间的连接失败，在源网络设备的小区是可用的情况下，所述终端设备与该源网络设备终端设备执行和源网络设备之间的连接恢复，该终端设备发送第一报告，该第一报告中可以包括以下至少一项：第五指示信息、第七指示信息、第十时间段信息、第十一时间段信息、第十二时间段信息、终端设备检测到与目标网络设备之间的连接失败至终端设备发起RRC重建立流程之间的时间段、终端设备检测到与目标网络设备之间的连接失败至终端设备与源网络设备之间的连接恢复成功之间的时间段。
第九方面，本申请实施例还提供了一种通信方法，该方法可由第三网络设备执行，也可以由可以配置于第三网络设备的部件(例如芯片或者电路)执行。该方法中，网络设备从终端设备接收第一报告，该第一报告可以参考第八方面的描述。
第十方面，本申请实施例提供一种通信装置，该装置具有实现上述第一方面或第一方面的任一种可能的设计中终端设备的功能，或具有实现上述第三方面或第三方面的任一种可能的设计中终端设备的功能，或具有实现上述第五方面或第五方面的任一种可能的设计中终端设备的功能，或具有实现上述第八方面终端设备的功能。该装置可以为终端设备，也可以为终端设备中包括的芯片。
该装置也可以具有实现上述第二方面或第二方面的任一种可能的设计中第三网络设备的功能，或者具有实现上述第四方面或第四方面的任一种可能的设计中第三网络设备的功能，或者具有实现上述第六方面或第六方面的任一种可能的设计中第三网络设备的功能，或者具有实现上述第九方面中第三网络设备的功能。该第三网络设备可以为源网络设备，也可以为目标网络设备，也可以为区别于源网络设备和目标网络设备的其他网络设备。该装置可以为网络设备，也可以为网络设备中包括的芯片。
该装置也可以具有实现上述第七方面或第七方面的任一种可能的设计中核心网设备的功能。该装置可以为核心网设备或核心网设备中包括的芯片。
上述通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现，所述硬件或软件包括一个或多个与上述功能相对应的模块或单元或手段(means)。
在一种可能的设计中，该装置的结构中包括处理模块和收发模块，其中，处理模块被配 置为支持该装置执行上述第一方面或第一方面的任一种设计中终端设备相应的功能，或者执行上述第二方面或第二方面的任一种设计中第三网络设备相应的功能，或者执行上述第三方面或第三方面的任一种可能的设计中终端设备相应的功能，或者执行上述第四方面或第四方面的任一种可能的设计中第三网络设备相应的功能，或者执行上述第五方面或第五方面的任一种可能的设计中终端设备相应的功能，或者执行上述第六方面或第六方面的任一种可能的设计中第三网络设备相应的功能，或者执行上述第七方面或第七方面的任一种可能的设计中第三网络设备相应的功能。收发模块用于支持该装置与其他通信设备之间的通信，例如该装置为终端设备时，可向第三网络设备发送第一报告。该通信装置还可以包括存储模块，存储模块与处理模块耦合，其保存有装置必要的程序指令和数据。作为一种示例，处理模块可以为处理器，通信模块可以为收发器，存储模块可以为存储器，存储器可以和处理器集成在一起，也可以和处理器分离设置，本申请并不限定。
在另一种可能的设计中，该装置的结构中包括处理器，还可以包括存储器。处理器与存储器耦合，可用于执行存储器中存储的计算机程序指令，以使装置执行上述第一方面、或第一方面的任一种可能的设计中的方法，或者执行上述第二方面或第二方面的任一种可能的设计中的方法，或者执行上述第三方面或第三方面的任一种可能的设计中的方法，或者执行上述第四方面或第四方面的任一种可能的设计中的方法，或者执行上述第五方面或第五方面的任一种可能的设计中的方法，或者执行上述第六方面或第六方面的任一种可能的设计中的方法，或者执行上述第七方面或第七方面的任一种可能的设计中的方法。可选地，该装置还包括通信接口，处理器与通信接口耦合。当装置为网络设备或终端设备时，该通信接口可以是收发器或输入/输出接口；当该装置为网络设备或终端设备中包含的芯片时，该通信接口可以是芯片的输入/输出接口。可选地，收发器可以为收发电路，输入/输出接口可以是输入/输出电路。
第十一方面，本申请实施例提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得该芯片系统实现上述第一方面或第一方面的任一种可能的设计中的方法，或实现上述第二方面或第二方面的任一种可能的设计中的方法，或实现上述第三方面或第三方面的任一种可能的设计中的方法，或实现上述第四方面或第四方面的任一种可能的设计中的方法，或实现上述第五方面或第五方面的任一种可能的设计中的方法，或实现上述第六方面或第六方面的任一种可能的设计中的方法，或实现上述第七方面或第七方面的任一种可能的设计中的方法或实现上述第八方面或第九方面的方法。
可选地，该芯片系统还包括接口电路，该接口电路用于交互代码指令至所述处理器。
可选地，该芯片系统中的处理器可以为一个或多个，该处理器可以通过硬件实现也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在一起，也可以和处理器分离设置，本申请并不限定。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型，以及存储器与处理器的设置方式不作具体限定。
第十二方面，本申请实施例提供一种计算机可读存储介质，其上存储有计算机程序或指 令，当该计算机程序或指令被执行时，使得计算机执行上述第一方面或第一方面的任一种可能的设计中的方法，或执行上述第二方面或第二方面的任一种可能的设计中的方法，或执行上述第三方面或第三方面的任一种可能的设计中的方法，或执行上述第四方面或第四方面的任一种可能的设计中的方法，或执行上述第五方面或第五方面的任一种可能的设计中的方法，或执行上述第六方面或第六方面的任一种可能的设计中的方法，或执行上述第七方面或第七方面的任一种可能的设计中的方法或执行上述第八方面或第九方面的方法。
第十三方面，本申请实施例提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述第一方面或第一方面的任一种可能的设计中的方法，或执行上述第二方面或第二方面的任一种可能的设计中的方法，或执行上述第三方面或第三方面的任一种可能的设计中的方法，或执行上述第四方面或第四方面的任一种可能的设计中的方法，或执行上述第五方面或第五方面的任一种可能的设计中的方法，或执行上述第六方面或第六方面的任一种可能的设计中的方法，或执行上述第七方面或第七方面的任一种可能的设计中的方法或执行上述第八方面或第九方面的方法。
第十四方面，本申请实施例提供一种通信系统，该通信系统包括终端设备和第三网络设备。可选的，该通信系统中还可包括源网络设备、目标网络设备，所述第三网络设备可以与源网络设备或目标网络设备为同一网络设备，所述第三网络设备也可以为区别于源网络设备和目标网络设备的其他网络设备。可选的，所述通信系统中还可包括核心网设备。
附图说明
图1为本申请实施例适用的一种通信系统的网络架构示意图；
图2为本申请实施例提供的一种通信方法的流程示意图；
图3为本申请实施例中终端设备在接入到目标网络设备之前检测到与源网络设备之间的连接失败的情形下时间段的划分示意图；
图4为本申请实施例中终端设备在接入到目标网络设备之前检测到与源网络设备之间的连接失败的情形下时间段的划分示意图；
图5为本申请实施例中在条件切换的场景下，终端设备可能的检测到与源网络设备之间的连接失败的时间点的示意图；
图6为本申请实施例提供的另一种通信方法的流程示意图；
图7为本申请实施例提供的又一种通信方法的流程示意图；
图8为本申请实施例提供的一种通信装置的结构示意图；
图9为本申请实施例提供的一种通信装置的另一结构示意图；
图10为本申请实施例提供的另一种通信装置的结构示意图；
图11为本申请实施例提供的另一种通信装置的另一结构示意图；
图12为本申请实施例提供的又一种通信装置的结构示意图；
图13为本申请实施例提供的又一种通信装置的另一结构示意图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例作进一步地详细描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、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)，或者应用于未来的通信系统或其它类似的通信系统等。
请参考图1，为本申请实施例适用的一种通信系统的结构示意图，该通信系统中包括终端设备、源网络设备、目标网络设备。其中，源网络设备是指终端设备在执行小区切换前接入的网络设备，目标网络设备是指终端设备在执行小区切换后接入的网络设备。相应的，源小区是指终端设备在执行小区切换前接入的小区，该源小区为源网络设备覆盖下的小区，或者说源小区为源网络设备管辖的小区。目标小区是指终端设备在执行小区切换后接入的小区，该目标小区为目标网络设备覆盖下的小区，或者说目标小区为目标网络设备管辖的小区。
可选的，该通信系统中还可包括第三网络设备，第三网络设备是指终端设备上报无线链路失败RLF报告的网络设备。该第三网络设备可以是源网络设备或目标网络设备，也可以是区别于源网络设备和目标网络设备的其他网络设备。也就是说，终端设备可以向源网络设备发送RLF报告，也可以向目标网络设备发送RLF报告，还可以向源网络设备或目标网络设备之外的其他网络设备上报RLF报告，本申请并不限定。
应理解，本申请实施例中，终端设备可能会因为位置的移动、进行的业务类型的变化或是其他原因而发生由源网络设备至目标网络设备的切换，本申请并不限定。
还应理解，本申请实施例中所提及的源网络设备、目标网络设备或第三网络设备可以为接入网设备，例如基站。接入网设备在不同的系统对应不同的设备，例如在5G系统中对应5G中的接入网设备，例如gNB。而且，本申请实施例中所提及的源网络设备、目标网络设备或第三网络设备可以为支持相同或不同通信制式的接入网设备，本申请并不限定。
此外，尽管图1中仅示出了一个终端设备，但可以理解，一个网络设备可以为一个或多个终端设备提供服务，本申请实施例对通信系统中包括的网络设备的数量以及终端设备的数量均不作限定。
下面对本申请实施例中所涉及的DAPS切换机制进行说明。
1)对于下行链路(downlink，DL)：
源网络设备向终端设备发送切换命令消息后，可以继续向终端设备发送下行数据包。另外，源网络设备可以与目标网络设备之间进行下行数据转发(data forwarding)。具体的，源网络设备可将分配了分组数据汇聚协议(packet data convergence protocol，PDCP)序列号(sequence number，SN)的一个或多个PDCP服务数据单元(service data unit，SDU)与其对应的PDCP SN一起发送给目标网络设备。对于从源网络设备接收到的这些PDCP SDU(s)， 目标网络设备可采用自身对应的头压缩上下文、密钥等进行头压缩、加密等处理后，生成PDCP协议数据单元(protocol data unit，PDU)(s)，当终端设备成功切换至目标网络设备后(例如，随机接入RACH过程成功或目标网络设备接收到终端设备发送的无线资源控制(radio resource control，RRC)重配置完成消息后)，目标网络设备可以将这些PDCP PDU(s)发送给终端设备。
终端设备接收到切换命令消息后，保持与源网络设备的数据传输。即终端设备保持源基站对应的用户面协议栈，对源侧对应的用户面协议栈不进行层2(层2包括媒体接入控制(media access control，MAC)/无线链路控制层(radio link control，RLC)/PDCP/业务数据适配协议(service data adaptation protocol，SDAP)协议层)的恢复/重建立，而且，终端设备建立目标侧对应的用户面协议栈，用于与目标网络设备进行随机接入以及数据传输。在终端设备释放与源网络设备的连接前，终端设备维护两套安全密钥(或者说安全上下文)、两套头解压缩上下文(或者说两套头压缩上下文)，并根据数据包是来自于源网络设备还是目标网络设备，采用相应的密钥/头解压缩上下文对接收到的数据包进行处理，具体的，对于从源网络设备接收到的PDCP PDU，终端设备使用源网络设备所对应的头解压缩上下文进行头解压缩、源网络设备所对应的安全密钥进行解密等处理；对于从目标网络设备接收到的PDCP PDU，终端设备使用目标网络设备所对应的头解压缩上下文进行头解压缩、目标网络设备所对应的安全密钥进行解密等处理。
2)对于上行链路(uplink，UL)：
终端设备接收到切换命令消息后，可以继续与源网络设备进行上行数据的传输。同时终端设备会执行到目标网络设备的随机接入RACH过程。当该RACH过程成功(比如，对于基于非竞争的RACH过程，当终端设备收到消息MSG2或消息msgB，如随机接入响应(random access response，RAR)消息；对于基于竞争的RACH过程，终端设备确定冲突解决。比如当终端设备收到竞争冲突解决消息，且冲突解决标识为终端设备对应的冲突解决标识)，终端设备进行上行路径切换。即RACH成功后，终端设备不再与源网络设备进行新的PDCP SDU的上行传输，一旦RACH成功，UE开始与目标网络设备进行新的PDCP SDU的上行传输。
本申请实施例还涉及到了条件切换(conditional handover，CHO)，条件切换是指源网络设备可向至少一个目标网络设备发送切换请求消息，至少一个目标网络设备可分别为终端设备预留相应的资源配置，该至少一个目标网络设备可理解为候选的目标网络设备。源网络设备向终端设备发送上述至少一个目标网络设备的条件切换配置信息，终端设备根据条件切换的触发条件是否满足确定是否执行切换。当条件切换的触发条件被满足时，终端设备可向这至少一个候选的目标网络设备中的其中一个目标网络设备发起切换。
下面对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
1)终端设备，是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等。所述终端设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音和/或数据。所述终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端 设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请的实施例对应用场景不做限定。终端设备有时也可以称为用户设备(user equipment，UE)、移动台和远方站等，本申请的实施例对终端设备所采用的具体技术、设备形态以及名称不做限定。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备或智能穿戴式设备等，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能头盔、智能首饰等。
本申请实施例中的终端设备还可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元，车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元可以实施本申请的方法。
2)网络设备，也称接入网设备，是网络中用于将终端设备接入到无线网络的设备。所述网络设备可以为无线接入网中的节点，又可以称为基站，还可以称为无线接入网(radio access network，RAN)节点(或设备)。网络设备可用于将收到的空中帧与网际协议(IP)分组进行相互转换，作为终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括IP网络。网络设备还可协调对空口的属性管理。
所述网络设备可以包括长期演进(long term evolution，LTE)系统或演进的LTE系统(LTE-Advanced，LTE-A)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，如传统的宏基站eNB和异构网络场景下的微基站eNB，或者也可以包括第五代移动通信技术(5th generation，5G)新无线(new radio，NR)系统中的下一代节点B(next generation node B，gNB)，或者还可以包括无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、传输接收点(transmission reception point，TRP)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)、基带池BBU pool，或无线保真(wireless fidelity，WiFi)接入点(access point，AP)、接入回传一体化(integrated access and backhaul，IAB)节点等，再或者还可以包括云接入网(cloud radio access network，CloudRAN)系统中的集中式单元(centralized unit，CU)和/或分布式单元(distributed unit，DU)，本申请实施例并不限定。
例如，在一种网络结构中，网络设备可以为CU节点、或DU节点、或为包括CU节点和DU节点的接入网设备。进一步地，CU节点可以划分为控制面(CU-CP)和用户面(CU-UP)，其中CU-CP负责控制面功能，主要包含无线资源控制(radio resource control，RRC)和分组数据汇聚协议(packet data convergence protocol，PDCP)-C，PDCP-C主要负责控制面数据的加解密，完整性保护，数据传输等。CU-UP负责用户面功能，主要包含服务数据 适配协议(service data adaptation protocol，SDAP)和PDCP-U，SDAP主要负责将核心网的数据进行处理并将流(flow)映射到承载(bearer)，PDCP-U主要负责数据面的加解密，完整性保护，头压缩，序列号维护，数据传输等。CU-CP与CU-UP可通过E1接口连接。CU-CP代表CU通过Ng接口和核心网连接，通过F1-C(控制面)和DU连接。CU-UP通过F1-U(用户面)和DU连接。当然还有一种可能的实现是PDCP-C也在CU-UP。
3)需要说明的是，本申请实施例中的术语“系统”和“网络”可被互换使用。“多个”是指两个或两个以上，鉴于此，本申请实施例中也可以将“多个”理解为“至少两个”。“至少一个”，可理解为一个或多个，例如理解为一个、两个或更多个。例如，包括至少一个，是指包括一个、两个或更多个，而且不限制包括的是哪几个。例如，包括A、B和C中的至少一个，那么包括的可以是A、B、C，A和B，A和C，B和C，或A和B和C。同理，对于“至少一种”等描述的理解，也是类似的。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，字符“/”，如无特殊说明，一般表示前后关联对象是一种“或”的关系。
除非有相反的说明，本申请实施例提及“第一”、“第二”等序数词用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度，并且“第一”、“第二”的描述也并不限定对象一定不同。
可以理解的，本申请实施例中，终端设备和/或网络设备可以执行本申请实施例中的部分或全部步骤，这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者各种操作的变形。此外，各个步骤可以按照本申请实施例呈现的不同的顺序来执行，并且有可能并非要执行本申请实施例中的全部操作。
请参考图2，为本申请实施例提供的一种通信方法的流程示意图，该方法包括如下步骤：
步骤S201、终端设备从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备。
所述第一消息可以是重配置消息或其它消息，本申请并不限定。所述重配置消息例如可以是RRC重配置消息或RRC连接重配置消息。
可选的，该第一消息中可包括切换命令，该切换命令用于指示或配置终端设备由源网络设备切换到目标网络设备，该切换命令也可以理解为源网络设备发送的用于指示终端设备进行切换的信息。该切换命令又可以称为切换指示或切换命令信息，或者具有其他名称，本申请并不限定。进一步地，该切换命令还可以具体为DAPS切换命令，即用于指示终端设备进行DAPS切换的信息。
步骤S202、终端设备接收到第一消息后，保持与源网络设备之间的数据传输。
所述终端设备保持与源网络设备之间的数据传输是指，终端设备保持源网络设备对应的协议栈，对源侧对应的协议栈不进行层2的恢复或重建立，所述协议栈包括控制面协议栈和/或用户面协议栈。如此，在下行方向上，终端设备可继续从源网络设备接收数据，在上行方向上，终端设备可继续向源网络设备发送数据。
如前所述，本申请实施例可应用于DAPS切换场景下，如此，终端设备从源网络设备接收第一消息后，在保持与源网络设备对应的协议栈的同时，还可建立与目标网络设备对应的 协议栈，并执行随机接入RACH过程，以接入目标网络设备。应理解，该随机接入过程可能成功，也可能失败，本申请并不限定。也就是说，本申请实施例所提供的方法既可适用于终端设备成功接入到目标网络设备的场景，也可适用于终端设备未成功接入到目标网络设备的场景。其中，终端设备未成功接入目标网络设备可以包括终端设备短时间与目标网络设备建立连接后，与目标网络设备之间的连接又失败了；或者，可以包括接入失败，即终端设备未能成功与目标网络设备建立连接。所述接入失败可以指随机接入过程失败，或者终端设备无法成功向目标网络设备发送重配置完成消息。
若接入成功，终端设备还可从目标网络设备接收第一释放消息，该第一释放消息用于指示终端设备释放与源网络设备之间的连接。
步骤S203、终端设备检测到与源网络设备之间的连接失败。
本申请实施例中，终端设备与源网络设备之间的连接失败可能发生在终端设备接入到目标网络设备之前，也可能发生在终端设备接入到目标网络设备之后。如此，终端设备可以在接入到目标网络设备之前，检测到与源网络设备之间的连接失败；例如在执行到目标网络设备的随机接入过程前检测到与源网络设备之间的连接失败。终端设备也可以在接入到目标网络设备之后，检测到与源网络设备之间的连接失败；例如在随机接入过程成功后，向目标网络设备发送切换完成消息的之前或之后，检测到与源网络设备之间的连接失败。可选的，终端设备可以在随机接入过程成功后，向目标网络设备发送切换完成消息之后，检测到与源网络设备之间的连接失败；或者终端设备可以在向目标网络设备发送切换完成消息之后，以及在接收到目标网络设备发送的第一释放消息之前，检测到与源网络设备之间的连接失败。
可以理解的是，若终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前，那么终端设备检测到与源网络设备之间的连接失败后，并不会执行源侧用户面协议栈的重建立，而是继续执行到目标网络设备的随机接入过程。
步骤S204、终端设备向第三网络设备发送第一报告，该第一报告中包括第一指示信息和/或至少一个时间段信息。
其中，所述第一指示信息用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前。在一种可能的实现方式中，该第一指示信息可指示终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前，即明确指示出终端设备与源网络设备之间的连接失败是发生在终端设备接入到目标网络设备之前，还是之后。例如该第一指示信息可以为一个比特位，该比特位可以被置为0或1，当该比特位被置为0时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前，当该比特位被置为1时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后。
在另一种可能的实现方式中，该第一指示信息也可以单独指示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前，或者单独指示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后。例如，该第一指示信息可以为一个预先设定的标志，当第一报告中包含该标志时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前；当第一报告中未包含该标志时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后。或者， 也可以反过来，即当第一报告中不包含该标志时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前；当第一报告中包含该标志时，可表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后。
需要说明的是，本申请实施例中，第一报告中并非一定包含第一指示信息，该第一指示信息也可以是第一报告中可选的信息。类似的，所述至少一个时间段信息也可以是第一报告中可选的信息。若第一报告中不包含第一指示信息，但包含至少一个时间段信息，那么在这一情况下，网络设备仍可以根据第一报告中的至少一个时间段信息，来判断终端设备与源网络设备之间的连接失败是发生在终端设备接入到目标网络设备的之前，还是之后，因为不同场景下时间段的划分是不同的。
本申请实施例中，第一报告中包含哪些时间段信息，与终端设备是在接入到目标网络设备之前，还是在接入到目标网络设备之后，检测到与源网络设备之间的连接失败有关。
若终端设备在接入到目标网络设备之前，检测到与源网络设备之间的连接失败，那么第一报告中的所述至少一个时间段信息可以包括下列时间段信息中的一项或多项：第一时间段信息、第二时间段信息、第三时间段信息、第四时间段信息。
上述各个时间段的划分可如图3所示，其中，第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该时间段可对应于图3中的时间段T1。
第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送第一报告之间的时间段，该时间段可对应于图3中的时间段T2。
第三时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备接入到目标网络设备之间的时间段，该时间段可对应于图3中的时间段T3。可选的，所述接入到目标网络设备可以指终端设备向目标网络设备发起随机接入过程，或者终端设备向目标网络设备发送重配置完成消息。
第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段，该时间段可对应于图3中的时间段T4。
可选的，在图3中所示的示例中，源网络设备可在步骤S301中执行与目标网络设备之间的切换流程。其中包括：源网络设备决策对终端设备执行到目标网络设备的DAPS切换；然后源网络设备向目标网络设备发送切换请求消息，目标网络设备接收到切换请求消息后，进行接入控制；若允许将终端设备接入，目标网络设备向源网络设备发送切换通知消息，该切换通知消息用于指示源网络设备允许终端设备进行切换。如此，源网络设备接收到该切换通知消息后，可在步骤S302中向终端设备发送第一消息，以指示终端设备进行切换。
在步骤S303中，终端设备在接收到第一消息后，可保持与源网络设备之间的数据传输。在步骤S304中，终端设备检测到与源网络设备之间的连接失败。在步骤S305中，终端设备执行到目标网络设备随机接入过程，以接入目标网络设备。应注意，此处，步骤S304在步骤S305之前执行，表示终端设备在接入目标网络设备之前，检测到与源网络设备之间的连接失败。此后，在步骤S306中，终端设备可记录切换过程中的各项参数，例如上文中所提及的第一指示信息和/或至少一个时间段信息，或者还可以包括其他信息，生成第一报告。然后在步骤S307中，终端设备将生成的第一报告发送给第三网络设备。在步骤S308中，第三网络设备可从终端设备接收第一报告。可选的，第三网络设备还可进一步将第一报告发 送给需要的网络设备，例如源网络设备。作为另一种实现方式，终端设备也可以在步骤S304后执行步骤S306，然后执行步骤S305，步骤S307，步骤S308。即终端设备检测到与源网络设备之间的连接失败后，记录切换过程中的各项参数。
可以理解，图3中所示的步骤S301至步骤S309为图2中所示的各个步骤的一种具体实施方式，或者也可以理解为对图2中所示的各个步骤的细化或扩展。其中，步骤S302可与步骤S201相对应，步骤S303可与步骤S202相对应，步骤S304可与步骤S203相对应，步骤S307可与步骤S204相对应，步骤S308可与步骤S205相对应，步骤S309可与步骤S206相对应。
由图3可以看出，本申请实施例中，可根据切换过程中各个关键事件的时间点划分得到各个时间段，且部分时间段之间存在着重叠、或包含与被包含的关系。例如第二时间段信息指示的时间段(即时间段T2)由第三时间段信息指示的时间段(即时间段T3)和第四时间段信息指示的时间段(即时间段T4)组成，这样，根据时间段T2、T3、T4中的任意两个时间段也可得知另一时间段的信息。
可以理解的，切换过程中各个关键事件的时间点还可以包括如下至少一种关键事件发生时的时间点：接收切换配置相关的消息，条件切换的触发条件满足，检测到终端设备与源网络设备之间的连接失败，接入到目标网络设备，检测到终端设备与目标网络设备之间的连接失败，接收来自目标网络设备的第一释放消息，向网络设备发送第一报告。
鉴于此，在一种可能的实现方式中，第一报告中的至少一个时间段信息也可以包括第一时间段信息和第二时间段信息，这一实现方式也可以理解为根据终端设备与源网络设备之间的连接失败的时间点划分时间段。或者，在另一种可能的实现方式中，第一报告中的至少一个时间段信息也可以包括第一时间段信息、第三时间段信息和第四时间段信息，这一实现方式也可以理解为根据终端设备的切换过程中的关键事件，如与源网络设备的连接失败、到目标网络设备的随机接入成功等，划分时间段。
若终端设备在接入到目标网络设备之后，检测到与源网络设备之间的连接失败，那么第一报告中可包括下列时间段信息中的一项或多项：第一时间段信息、第二时间段信息、第四时间段信息、第五时间段信息、第六时间段信息。
上述各个时间段的划分可如图4所示，其中，第一时间段信息、第二时间段信息和第四时间段信息的描述可以参考上述实施例详细描述，此处不再赘述。第一时间段、第二时间段和第四时间段可分别对应于图4中所示的时间段T1、T2和T4。
第五时间段信息用于指示终端设备接收到第一消息至终端设备接入到目标网络设备之间的时间段，该时间段可对应于图4中所示的时间段T5。
第六时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与源网络设备之间的连接失败之间的时间段，该时间段可对应于图4中所示的时间段T6。
可选的，在图4所示的示例中，步骤S401至步骤SS409的具体实施方式可参考图3中各对应步骤的描述。但应注意，步骤S404对应于图3中的步骤S305，步骤S405对应于图3中的步骤S304。也就是说，在图4所示的示例中，终端设备先执行到目标网络设备的随机接入过程，接入目标网络设备，然后才检测到与源网络设备之间的连接失败，也就是说，步骤S404在步骤S405之前执行，这与图3中的步骤S304与步骤S305的执行顺序不同。 类似的，图4中所示的步骤S401至步骤S409为图2中所示的各个步骤的另一种具体实施方式，或者也可以理解为对图2中所示的各个步骤的另一种细化或扩展。
需要说明的是，本申请实施例中，作为又一种可能的实现方式，每个时间段信息可以包括所指示时间段的开始时间点、结束时间点和持续时长等信息的至少一种。
本申请实施例还可进一步应用于DAPS切换与条件切换相结合的场景下，如此，终端设备可从源网络设备接收条件切换配置信息，该条件切换配置包括条件切换的触发条件和至少一个候选的目标网络设备。若触发条件被满足，终端设备可从至少一个候选的目标网络设备中，确定出一个目标网络设备，然后执行到该目标网络设备的随机接入过程。
应注意的是，在涉及条件切换的场景下，当终端设备从源网络设备接收条件切换配置信息后，终端设备在条件切换的触发条件满足后执行到目标网络设备的切换。
所述条件切换配置信息可以通过步骤S201中所述的第一消息中发送，也可以通过其他消息发送，本申请并不限定。也就是说，条件切换配置信息与DAPS切换命令可以在同一条消息中发送，也可以在不同的消息中发送。
可以理解，在DAPS切换与条件切换相结合的场景下，终端设备与源网络设备的连接失败可能发生在条件切换的触发条件满足前，也可能发生在条件切换的触发条件满足后。这样，如图5所示，终端设备与源网络设备的连接失败可能发生在图5中所示的三个可能的连接失败点中的其中一个。其中，第一个连接失败点表示终端设备与源网络设备之间的连接失败发生在条件切换的触发条件满足前，当然也在终端设备接入到目标网络设备之前；第二连接失败点表示终端设备与源网络设备之间的连接失败发生在条件切换的触发条件满足后，但是在终端设备接入到目标网络设备之前；第三连接失败点表示终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后，当然也在条件切换的触发条件满足后。
相应的，第一报告中还可包括第二指示信息，该第二指示信息用于指示终端设备在触发条件满足前，检测到与源网络设备之间的连接失败；或者第二指示信息也可用于指示终端设备在触发条件满足后且接入到目标网络设备前，检测到与源网络设备之间的连接失败；或者第二指示信息又可用于指示终端设备在触发条件满足后且接入到目标网络设备后，检测到与源网络设备之间的连接失败。本申请实施例对第二指示信息的具体表现形式不作限定。
可选的，第一报告中可以包括关于源网络设备和/或目标网络设备的信息。例如，第一报告中可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，可便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
其中，源网络设备的小区信息可以是指源小区的信息，目标网络设备的小区信息可以是指目标小区的信息。所述小区的信息可以包括小区的小区全局标识(cell global identifier，CGI)、物理小区标识(physical cell identifier，PCI)和频点、小区标识(cell identifier)、跟踪区码(tracking area code，TAC)中的至少一种。
所述小区质量信息可以包括接收信号码功率(received signal code powe，RSCP)、参考信号接收功率(reference signal receiving power，RSRP)、参考信号接收质量(reference signal receiving quality，RSRQ)、信噪比(signal noise ratio，SNR)、信号与干扰加噪声比(signal  to interference plus noise ratio，SINR)、参考信号强度指示(reference signal strength indication，RSSI)或其它信号质量中的至少一种。小区质量可以是小区级的，波束级的，同步信号/物理广播信道块级的，信道状态信息参考信号(channel-state information reference signal，CSI-RS)级的，空口技术(numerology)级的，切片(slicing)级的，或部分带宽(bandwidth part，BWP)级的至少一种。小区质量可以通过测量下行同步信道、信道状态信息参考信号、解调参考信号(demodulation reference signal，DMRS)、小区参考信号(cell-specific reference signal，CRS)信号、同步信号(synchronization signal，SS)、同步信号/物理广播信道块(synchronization signal/physical broadcast channel block，SS/PBCH Block)或者其它下行信号中的至少一种获得的。可以理解的，若小区质量信息为波束级的，同步信号/物理广播信道块级的，信道状态信息参考信号级的，空口技术级的，切片级的，或部分带宽级的，小区的信息又可以包括对应的波束，同步信号/物理广播信道块，信道状态信息参考信号，空口技术，切片，或部分带宽的标识信息的至少一种。
所述至少一个时间点可以为：终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败的时间点、终端设备接入到目标网络设备的时间点、条件切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点中的一项或多项。应注意，所述终端设备接入到目标网络设备的时间点可以包括随机接入过程成功时的时间点，或者终端设备向目标网络设备发送切换完成消息的时间点。
可选的，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。如此，可便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
可选的，第一报告中又可以包括终端设备在目标网络设备上的随机接入信息。该随机接入信息可以包括终端设备发送前导的次数、是否到达最大的前导发送次数、最后一次发送前导时终端设备的发送功率是否达到最大值或者和最大值的差值小于或等于某一个阈值、是否检测到冲突、小区或波束质量是否高于某一门限、是否由两步随机接入流程回退到四步随机接入流程、上行载波信息等信息的至少一种。可以理解的，对应四步随机接入流程，前导可以为消息1(msg1)，对于两步随机接入流程，前导可以为消息A(msgA)。上行载波信息用于指示该随机接入信息对应的上行载波，比如上行载波信息可以用于指示对应的上行载波为NR UL还是补充上行载波，或者，上行载波信息可以用于网络设备确定其频点信息。该随机接入信息可以是小区级的，波束级的，同步信号/物理广播信道块级的，信道状态信息参考信号级的，空口技术级的，切片级的，或部分带宽级的至少一种。可以理解的，该随机接入信息又可以包括对应的波束，同步信号/物理广播信道块，信道状态信息参考信号，空口技术，切片，或部分带宽的标识信息的至少一种。
可选的，第一报告中又可包括第六指示信息，该第六指示信息指示终端设备接收到来自目标网络设备的第一释放消息时，终端设备与源网络设备之间的连接是否发生失败。其中，第一释放消息用于指示终端设备释放与源网络设备之间的连接。或者，该第六指示信息也可以理解为，用于指示终端设备与源网络设备之间的连接失败是发生在终端设备从目标网络设备接收到第一释放消息之前，或者用于指示终端设备从目标网络设备接收到第一释放消息前终端设备和源网络设备之间的连接未发生失败。
可以理解，本申请实施例中，终端设备可在执行步骤S204之前，根据从源网络设备到 目标网络设备的切换过程中的一种或多种信息，生成上述第一报告。该第一报告可以为无线链路失败RLF报告、建立失败报告、恢复失败报告、切换成功报告中的至少一种。
步骤S205、第三网络设备从终端设备接收第一报告。
可选的，在第三网络设备接收到第一报告后，进一步的，所述第一报告可以在CU节点和DU节点之间传输，也可以在网络设备之间传输，或者可以在网络设备与核心网设备之间传输，本申请并不限定。
在一种可能的实现方式中，若第三网络设备为包括CU节点和DU节点的分离式的形态，那么第三网络设备中的CU节点可以从终端设备接收第一报告。可选的，该CU节点还可将第一报告中包括的部分或全部信息发送给DU节点。可选的，若CU节点可以划分为控制面(CU-CP)和用户面(CU-UP)，又可以包括CU-CP节点将第一报告中包括的部分或全部信息发送给CU-UP节点。
在另一种可能的实现方式中，第三网络设备可以将第一报告发送给其他需要的网络设备。例如在如下的步骤S206中，第三网络设备可将第一报告发送给源网络设备和/或目标网络设备。
步骤S206、第三网络设备将第一报告发送给源网络设备和/或目标网络设备。
以第三网络设备将第一报告发送给源网络设备为例，第三网络设备可将第一报告中包括的部分或全部信息发送给源网络设备。可选的，第三网络设备还可以向源网络设备发送第一报告的类型信息。例如，若第三网络设备和源网络设备间存在可以直接进行通信的接口，则第三网络设备可通过基站和基站间的接口向源网络设备发送第一报告的部分或全部信息。所述第三网络设备和源网络设备间的接口可以是X2接口或Xn接口。可选的，第三网络设备可以通过失败指示(FAILURE INDICATION、RLF INDICATION)消息、切换报告(HANDOVER REPORT)消息或者其他消息向源网络设备发送第一报告的部分或全部信息。
若第三网络设备和源网络设备间无法直接进行通信，则第三网络设备可以通过核心网设备向源网络设备发送第一报告的部分或全部信息。可选的，第三网络设备还可以向源网络设备发送第一报告的类型信息。例如，通过基站和核心网设备间的接口向核心网设备发送第一报告的部分或全部信息；具体地，第三网络设备通过S1或NG接口向核心网设备发送第一报告的部分或全部信息，由核心网设备向源网络设备转发从第三网络设备接收到的信息。具体的，第三网络设备可以通过S1/NG接口上的以下消息向源网络设备发送第一报告的部分或全部信息：上行RAN配置传输(UPLINK RAN CONFIGURATION TRANSFER)消息、下行RAN配置传输(DOWNLINK RAN CONFIGURATION TRANSFER)消息、基站配置传输(eNB CONFIGURATION TRANSFER)消息、核心网设备配置传输(MME CONFIGURATION TRANSFER)消息或者其他消息。
可以理解的，上述第三网络设备向源网络设备发送第一报告的实现方式可以适用本申请实施例中任意两个网络设备间发送第一报告的步骤。其中，发送第一报告的网络设备的实施方式可以参考上述第三网络设备的描述，接收第一报告的网络设备的实施方式可以产生上述源网络设备的描述。
可选的，以第三网络设备将第一报告发送给目标网络设备为例，第三网络设备可以通过上述方式将第一报告中包括的部分或全部信息发送给目标网络设备。可选的，进一步的，目标网络设备可以向源网络设备可以通过上述方式将第一报告中包括的部分或全部信息发 送给源网络设备。
可选的，若源网络设备或目标网络设备为包括CU节点和DU节点的分离式的形态，那么源网络设备或目标网络设备中的CU节点可以从终端设备接收第一报告。可选的，该CU节点还可将第一报告中包括的部分或全部信息发送给DU节点。可选的，若CU节点可以划分为控制面(CU-CP)和用户面(CU-UP)，又可以包括CU-CP节点将第一报告中包括的部分或全部信息发送给CU-UP节点。
可选的，上述第三网络设备或目标网络设备将第一报告的部分或全部信息发送给源网络设备时，又可以向源网络设备发送切换类型信息。切换类型信息用于指示终端设备发生连接失败时的移动性类型。切换类型信息可以为过晚DAPS切换(handover，HO)，过早DAPS HO，DAPS HO到错误小区，DAPS CHO过晚，DAPS CHO过早，DAPS CHO到错误小区的任意一种。
可以理解的，源网络设备，目标网络设备和第三网络设备可以是相同的系统，不同的系统，相同的制式，不同的制式，相同的系统不同的制式下的网络设备。可以理解的，对应的切换类型信息还可以用于指示系统和/或制式信息。作为一个示例，切换类型信息可以为异系统下的DAPS过早。
可以理解的，若终端设备记录的报告为第一系统或第一制式的第一报告，终端设备通过第二系统或第二制式下的第二网络设备发送该第一报告时，该第一报告可以是以容器的形式发送给第二系统或第二制式下的第二网络设备。可选的，终端设备可以在该容器外携带该报告对应的小区的信息，用于第二网络设备根据小区的信息确定转发该报告的目标网络设备。小区的信息的描述可以参考本申请其它实施例中的描述，此处不再赘述。可以理解的，该小区的信息可以为源小区的信息或者为目标小区的信息。比如，若终端设备和源网络设备之间的连接失败发生在终端设备接入到目标网络设备之前，该小区的信息可以为源小区的信息。对应的，第三网络设备可以基于源小区的信息确定向源网络设备发送第一报告。
可选的，本申请实施例中，终端设备还可从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。源网络设备可以在发送第一消息前，向终端设备发送该第三指示信息，也可以在发送第一消息的同时发送该第三指示信息，例如将第三指示信息携带在第一消息中发送给终端设备。可选的，在源网络设备向终端设备发送第三指示信息之前，源网络设备可以接收终端设备的能力信息，所述能力信息用于指示所述终端设备支持记录DAPS场景或者DAPS和CHO场景下的第一报告。源网络设备可以接收来自该终端设备或者其它网络设备或者核心网设备发送的上述能力信息。
所述第三指示信息可具有多种可能的实现方式。例如，第三指示信息可用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入目标网络设备之前的情况下，是否需要记录第一报告；或者，第三指示信息也可用于指示在终端设备与源网络设备之间的连接失败发生在终端设备接入到目标网络设备之后的情况下，是否需要记录第一报告；或者，第三指示信息还可用于指示在终端设备从目标网络设备接收到第一释放消息时，终端设备与源网络设备之间的连接未发生失败的情况下，是否需要记录第一报告；再或者，第三指示信息还可用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录第一报告；再或者，第三指示信息还可用于指示在切换类型为DAPS切换时，终端设备与所述源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录第一报告。该第一 时间点可以为源网络设备通知的一个特定的时间时刻或时间段。
可以看出，通过本申请实施例提供的MRO机制，可以使得终端设备记录DAPS切换场景下终端设备和源网络设备发生连接失败的信息并发送给网络设备，以使网络设备可以确定DAPS切换的指示是否发送过晚，以及DAPS切换相关的移动性参数是否容易造成潜在的DAPS切换命令发送失败的问题，从而调整对应的DAPS切换的移动性参数配置，提高后续的切换成功率。此外，本申请实施例中所提供的第一报告可包括多种类型的信元，从而实现DAPS切换场景下终端设备和源网络设备的连接失败的信息记录，提高方法的适用性。
请参考图6，为本申请实施例提供的另一种通信方法的流程示意图，该方法包括如下步骤：
步骤S601、终端设备从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备。
步骤S602、终端设备保持与源网络设备之间的数据传输。
步骤S603、终端设备成功接入到目标网络设备。
所述终端设备能够接入到目标网络设备可以包括终端设备执行的到目标网络设备的随机接入过程成功，或者终端设备向目标网络设备发送了切换完成消息。
步骤S604、终端设备从目标网络设备接收第一释放消息，该第一释放消息用于指示终端设备释放与源网络设备之间的连接。
步骤S605、终端设备向第三网络设备发送第一报告，该第一报告中包括第四指示信息和/或第八时间段信息。
其中，所述第四指示信息用于确定终端设备与源网络设备之间是否发生连接失败。
所述第八时间段信息用于指示终端设备接收到第一消息至终端设备从目标网络设备接收到第一释放消息之间的时间段，该时间段对应于图6中所示的时间段T8。
步骤S606、第三网络设备从终端设备接收第一报告。
步骤S607、第三网络设备将第一报告发送给源网络设备和/或目标网络设备。
可选的，上述方法还可包括步骤S600，即源网络设备与目标网络设备执行切换流程。
上述步骤S600至步骤S607的具体实施方式与上述步骤S201至步骤S206中类似，重复之处在此不再赘述。
应注意的是，在本申请实施例中，终端设备与源网络设备之间的连接没有发生失败，且终端设备接收到第一消息后，执行的到目标网络设备的随机接入过程也成功，即终端设备与目标网络设备成功建立了连接，也不存在与目标网络设备连接失败的情况。鉴于此，本申请实施例中所提供的第一报告也可以称为切换成功报告。
可选的，上述方法可以应用于DAPS切换场景，或者DAPS切换与条件切换相结合的场景。即终端设备可从源网络设备接收条件切换配置信息，该条件切换配置信息包括条件切换的触发条件和至少一个候选的目标网络设备。若触发条件被满足，终端设备可从至少一个候选的目标网络设备中，确定出一个目标网络设备，然后执行到该目标网络设备的随机接入过程。
可选的，第一报告中还可包括关于源网络设备和/或目标网络设备的信息。例如，第一报告中可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网 络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，以便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数是否合理。
该部分的具体实施方式可参考上文中的描述，在此不再重复。但应注意，所述至少一个时间点可包括终端设备接收到第一消息的时间点、终端设备成功接入到目标网络设备时的时间点、终端设备从目标网络设备接收到第一释放消息的时间点、条件切换的触发条件被满足时的时间点(即触发条件切换的时间点)、以及终端设备发送第一报告的时间点中的一个或多个。
可选的，第一报告中又可以包括终端设备在目标网络设备上的随机接入信息。具体的随机接入信息的描述可参考上文中的描述，此处不再赘述。如此，以便于目标网络设备根据第一报告中的随机接入信息确定随机接入参数是否合理。
可选的，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。以便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
可选的，终端设备还可从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。第三指示信息的具体实施方式可参考上文中的描述，在此不再重复。
可以看出，采用上述技术方案，终端设备在与源网络设备的连接没有失败，并且成功接入到目标网络设备的情况下，也可以记录切换过程中的各项信息(例如第四指示信息或第八时间段信息或切换过程中各关键时间点的源及目标的小区质量信息等)生成第一报告，并发送给源网络设备(直接发送或者间接发送)，如此可使源网络设备能够确定是否存在可能的切换场景，从而更合理地配置切换参数。
请参考图7，为本申请实施例提供的一种通信方法的流程示意图，该方法包括如下步骤：
步骤S701、终端设备从源网络设备接收第一消息，该第一消息用于使得终端设备由源网络设备切换到目标网络设备。
步骤S702、终端设备保持与源网络设备之间的数据传输。
可选的，步骤S703、终端设备检测到与源网络设备之间的连接失败。
步骤S704、终端设备检测到与目标网络设备之间的连接失败。
所述终端设备与目标网络设备之间的连接失败，可以包括终端设备成功与目标网络设备建立连接后，短时间内或者很快与目标网络设备之间的连接发生失败；或者，可以包括接入失败，即终端设备未能成功与目标网络设备建立连接。所述接入失败可以指随机接入过程失败，或者终端设备无法成功向目标网络设备发送重配置完成消息。
应注意，本申请实施例对终端设备检测到与源网络设备之间的连接失败，以及检测到与目标网络设备之间的连接失败的先后顺序并不作限定，即步骤S704可在步骤S703之后执行，也可以在步骤S703之前执行。
一种可能的方式中，S704在S703之后执行，即终端设备与目标网络设备之间的连接失败时，源网络设备已经发生RLF，此时，终端设备发起RRC重建立流程。
另一种可能的方式中，S704在S703之前执行。例如，可包括以下四种场景：
场景一：终端设备与目标网络设备的接入失败，如终端设备与目标小区的随机接入过程失败，若此时终端设备检测到源网络设备的小区不可用，例如终端设备与源网络设备之间的 链路发生RLF，则终端设备执行RRC重建立流程。
场景二：终端设备与目标网络设备的接入失败，如终端设备与目标小区的随机接入过程失败，若此时终端设备检测到源网络设备的小区可用，例如终端设备与源网络设备之间的链路没有发生RLF，则终端设备可以执行和源网络设备之间的连接恢复。一种示例，终端设备与源网络设备之间的连接恢复成功，例如，终端设备可以向源网络设备发送信息以指示终端与目标网络设备之间的接入失败，则终端设备与源网络设备进行通信。
场景三：终端设备与目标网络设备的接入失败，如终端设备与目标小区的随机接入过程失败，若此时终端设备检测到源网络设备的小区可用，例如终端设备与源网络设备之间的链路没有发生RLF，则终端设备可以执行和源网络设备之间的连接恢复。一种示例，终端设备与源网络设备之间的连接恢复失败，例如，终端设备无法恢复使用源网络设备侧的DRB和/或SRB配置，或者，终端设备无法向源网络设备发送信息以指示终端与目标网络设备之间的接入失败，则终端设备执行RRC重建立流程。
场景四：终端设备与目标网络设备的接入失败，如终端设备与目标小区的随机接入过程失败，若此时终端设备检测到源网络设备的小区可用，例如终端设备与源网络设备之间的链路没有发生RLF，则终端设备可以执行和源网络设备之间的连接恢复。一种示例，终端设备与源网络设备之间的连接恢复成功后，在一段时间后，终端设备检测到与源网络设备之间的连接失败，比如终端设备检测到和源网络设备之间发生连接失败，比如RLF，则终端设备执行重建立流程。
步骤S705、终端设备向第三网络设备发送第一报告。
该第一报告中可能包括下列信息中的一项或多项：第五指示信息、第三时间段信息、第五时间段信息、第九时间段信息、第十时间段信息、第十一时间段信息、第十二时间段信息、第七指示信息。
其中，第五指示信息用于确定终端设备与源网络设备之间的连接以及终端设备与目标网络设备之间的连接是否都发生失败。
可以理解的是，在不同的情况下，第一报告中包括的信息可能不同，第七指示信息的作用或者内容也会有所不同。例如：
在上述场景一中，该第一报告中包括下列信息中的一项或多项：第五指示信息、第十时间段信息、第七指示信息、终端设备检测到与目标网络设备之间的连接失败至终端设备发起RRC重建立流程之间的时间段。其中，第七指示信息用于指示终端设备和源网络设备之间的连接恢复失败。在上述场景二中，该第一报告中包括下列信息中的一项或多项：第五指示信息、第十时间段信息、第七指示信息、终端设备检测到与目标网络设备之间的连接失败至终端设备与源网络设备之间的连接恢复成功之间的时间段。其中，第七指示信息用于指示终端设备和源网络设备之间的连接恢复成功。
在上述场景三中，该第一报告中包括下列信息中的一项或多项：第五指示信息、第十时间段信息、第七指示信息、第十一时间段信息。其中，第七指示信息用于指示终端设备和源网络设备之间的连接恢复失败。
在上述场景四中，该第一报告中包括下列信息中的一项或多项：第五指示信息、第十时间段信息、第十一时间段信息、第十二时间段信息、第七指示信息。其中，第七指示信息用于指示终端设备和源网络设备之间的连接恢复成功后，源网络设备发生连接失败，比如RLF， 第十二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送第一报告之间的时间段。
以终端设备检测到与源网络设备之间的连接失败在检测到与目标网络设备之间的连接失败之前为例，即上述的S704在S703之后执行的一种可能的实现方式，第九时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备检测到与目标网络设备之间的连接发生失败之间的时间段，该时间段可对应于图7中所示的时间段T9。此场景下，除第九时间段信息，该第一报告中还可以包括下列信息中的一项或多项：第五指示信息、第十时间段信息、第七指示信息。其中，第七指示信息用于指示终端设备和源网络设备之间的连接恢复失败或终端设备未执行与源网络设备之间的连接恢复。或者，第三时间段信息，该第三时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备接入到目标网络设备之间的时间段；第九时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与目标网络设备之间的连接发生失败之间的时间段。
第十时间段信息用于指示终端设备检测到与目标网络设备之间的连接失败至终端设备发送第一报告之间的时间段，该时间段可对应于图7中所示的时间段T10。
以终端设备检测到与源网络设备之间的连接失败在检测到与目标网络设备之间的连接失败之后为例，第十一时间段信息用于指示终端设备检测到与目标网络设备之间的连接发生失败至终端设备检测到与源网络设备之间的连接失败之间的时间段。或者，第五时间段信息，该第五时间段信息用于指示终端设备接收到第一消息至终端设备接入到目标网络设备之间的时间段；第十一时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与目标网络设备之间的连接发生失败之间的时间段。
例如，“终端设备检测到源网络设备之间的连接失败在检测到与目标网络设备之间的连接失败之后”的一种场景可以为：终端检测到与目标网络设备之间的连接失败之后，比如接入失败，终端设备尝试执行和源网络设备之间的连接恢复，在该场景下，“终端设备检测到源网络设备之间的连接失败”可以为终端设备和源网络设备之间的连接恢复失败，或者，终端设备与源网络设备之间的连接恢复成功后，终端设备检测到与源网络设备之间的连接失败，比如终端设备检测到和源网络设备之间发生连接失败，比如RLF。
步骤S706、第三网络设备从终端设备接收第一报告。
步骤S707、第三网络设备将第一报告发送给源网络设备和/或目标网络设备。
可选的，上述方法还可包括步骤S700，即源网络设备与目标网络设备执行切换流程。
上述步骤S700至步骤S707的具体实施方式与步骤S201至步骤S206中类似，重复之处在此不再赘述。
应注意的是，在本申请实施例中，终端设备与源网络设备之间的连接发生失败，且终端设备与目标网络设备之间的连接成功建立后短时间内或者很快发生失败，或者说终端设备未能成功与目标网络设备建立连接。鉴于此，本申请实施例中所提供的第一报告也可以称为切换失败报告。
可选的，上述方法可以应用于DAPS切换场景，或者DAPS切换与条件切换相结合的场景。即终端设备可从源网络设备接收条件切换配置信息，该条件切换配置信息包括条件切换的触发条件和至少一个候选的目标网络设备。若触发条件被满足，终端设备可从至少一个候选的目标网络设备中，确定出一个目标网络设备，然后执行到该目标网络设备的随机接入 过程。
可选的，第一报告中还可包括关于源网络设备和/或目标网络设备的信息。例如，第一报告中可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。如此，以便于网络设备根据第一报告中的小区信息及小区质量信息确定切换参数的配置是否合理。
该部分的具体实施方式可参考上文中的描述，在此不再重复。但应注意，所述至少一个时间点可以包括所述至少一个时间点可包括终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败时的时间点、终端设备检测到与目标网络设备之间的连接失败时的时间点、条件切换的触发条件被满足时的时间点(即触发条件切换的时间点)、以及终端设备发送第一报告的时间点中的一个或多个。
可选的，第一报告中又可以包括终端设备在目标网络设备上的随机接入信息。具体的随机接入信息的描述可参考上文中的描述，此处不再赘述。如此，以便于目标网络设备根据第一报告中的随机接入信息确定随机接入参数是否合理。
可选的，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。以便于网络设备根据该切换类型信息进一步识别需要调整的切换参数。
可选的，终端设备还可从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。第三指示信息的具体实施方式可参考上文中的描述，在此不再重复。
可以看出，采用上述技术方案，终端设备在与源网络设备的连接发生失败，并且终端设备与目标网络设备之间的连接也失败的情况下，也可以记录切换过程中的各项信息(例如第五指示信息或至少一个时间段信息或切换过程中各关键时间点的源及目标的小区质量信息等)生成第一报告，并发送给第三网络设备，如此可使网络设备能够确定是否存在可能的切换场景，从而更合理地配置切换参数。
可以理解的是，上述各个方法实施例中，由终端设备实现的步骤或者操作，也可以由可配置于终端设备的部件实现，由网络设备实现的步骤或者操作，也可以由可以配置于网络设备的部件实现，由核心网设备实现的步骤或者操作，也可以由可配置于核心网设备的部件实现。
本申请实施例还提供一种通信装置，请参考图8，为本申请实施例提供的一种通信装置的结构示意图，该通信装置800包括：收发模块810和处理模块820。该通信装置可用于实现上述任一方法实施例中涉及终端设备的功能。例如，该通信装置可以是终端设备，例如手持终端设备或车载终端设备；该通信装置还可以是终端设备中包括的芯片，或者包括终端设备的装置，如各种类型的车辆等。
示例性的，当该通信装置作为终端设备，执行图2中所示的方法实施例时，收发模块810用于，从源网络设备接收第一消息，该第一消息用于使得该通信装置由源网络设备切换到目标网络设备；处理模块820用于，在所述收发模块810接收到第一消息后，保持该通信装置与源网络设备之间的数据传输；处理模块820还用于，检测到该通信装置与源网络设备之间的连接失败；收发模块810还用于，向第三网络设备发送第一报告，该第一报告中包括第一指示信息，该第一指示信息用于确定该通信装置与源网络设备之间的连接失败是否 发生在终端设备接入到目标网络设备之前。
在一种可能的设计中，处理模块820具体用于，在该通信装置接入到目标网络设备之前，检测到该通信装置与源网络设备之间的连接失败。相应的，第一报告中还可包括下列时间段信息中的一项或多项：第一时间段信息，该第一时间段信息用于指示该通信装置接收到第一消息至该通信装置检测到与源网络设备之间的连接失败之间的时间段；第二时间段信息，该第二时间段信息用于指示该通信装置检测到与源网络设备之间的连接失败至该通信装置发送第一报告之间的时间段；第三时间段信息，该第三时间段信息用于指示该通信装置检测到与源网络设备之间的连接失败至该通信装置接入到目标网络设备之间的时间段；第四时间段信息，该第四时间段信息用于指示该通信装置接入到目标网络设备至该通信装置发送第一报告之间的时间段。
在一种可能的设计中，处理模块820具体用于，在该通信装置接入到目标网络设备之后，检测到该通信装置与源网络设备之间的连接失败。相应的，第一报告中还可包括下列时间段信息中的一项或多项：第一时间段信息，该第一时间段信息用于指示该通信装置接收到第一消息至该通信装置检测到与源网络设备之间的连接失败之间的时间段；第二时间段信息，该第二时间段信息用于指示该通信装置检测到与源网络设备之间的连接失败至该通信装置发送第一报告之间的时间段；第四时间段信息，该第四时间段信息用于指示该通信装置接入到目标网络设备至该通信装置发送第一报告之间的时间段；第五时间段信息，该第五时间段信息用于指示该通信装置接收到第一消息至该通信装置接入到目标网络设备之间的时间段；第六时间段信息，该第六时间段信息用于指示该通信装置接入到目标网络设备至该通信装置检测到与源网络设备之间的连接失败之间的时间段。
在一种可能的设计中，收发模块810还用于，从源网络设备接收条件切换配置信息，该条件切换配置信息包括条件切换的触发条件和至少一个候选的目标网络设备；若条件切换的触发条件被满足，处理模块820还用于，从所述至少一个候选的目标网络设备中确定目标网络设备；
相应的，第一报告还可包括第二指示信息，其中，该第二指示信息用于指示该通信装置在条件切换的触发条件满足前，检测到该通信装置与源网络设备之间的连接失败，或者，该第二指示信息也可用于指示该通信装置在条件切换的触发条件满足后且接入到目标网络设备前，检测到该通信装置与源网络设备之间的连接失败，或者，该第二指示信息还可用于指示该通信装置在条件切换的触发条件满足后且该通信装置接入到目标网络设备之后，检测到该通信装置与源网络设备之间的连接失败。
在一种可能的设计中，第一报告中还包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。
在一种可能的设计中，第一报告中还可包括上述至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：该通信装置接收到第一消息的时间点、该通信装置检测到与源网络设备之间的连接失败的时间点、该通信装置接入到目标网络设备的时间点、条件切换的触发条件被满足时的时间点、该通信装置发送第一报告的时间点。
在一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切 换类型。
在一种可能的设计中，收发模块810还用于，从源网络设备接收第三指示信息，该第三指示信息用于指示是否需要记录第一报告。
在一种可能的设计中，该第三指示信息可具体用于指示在该通信装置与源网络设备之间的连接失败发生在通信装置接入到目标网络设备之前的情况下，是否需要记录第一报告；或者，第三指示信息可具体用于指示在该通信装置与源网络设备之间的连接失败发生在该通信装置接入到目标网络设备之后的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在该通信装置从目标网络设备接收到第一释放消息时，该通信装置与源网络设备之间的连接未发生失败的情况下，是否需要记录第一报告；或者，第三指示信息还可具体用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录第一报告；或者，该第三指示信息还可具体用于指示在切换类型为DAPS切换时，该通信装置与源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录第一报告。
该通信装置中涉及的处理模块820可以由至少一个处理器或处理器相关电路组件实现，收发模块810可以由至少一个收发器或收发器相关电路组件或通信接口实现。该通信装置中的各个模块的操作和/或功能分别为了实现图2、图3、图4、图6或图7中所示方法的相应流程，为了简洁，在此不再赘述。可选的，该通信装置中还可以包括存储模块，该存储模块可以用于存储数据和/或指令，收发模块810和/或处理模块820可以读取存取模块中的数据和/或指令，从而使得通信装置实现相应的方法。该存储模块例如可以通过至少一个存储器实现。
上述存储模块、处理模块和收发模块可以分离存在，也可以全部或者部分模块集成，例如存储模块和处理模块集成，或者处理模块和收发模块集成等。
请参考图9，为本申请实施例中提供的一种通信装置的另一结构示意图。该通信装置具体可为一种终端设备。便于理解和图示方便，在图9中，终端设备以手机作为例子。如图9所示，终端设备包括处理器，还可以包括存储器，当然，也还可以包括射频电路、天线以及输入输出装置等。处理器主要用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当需要发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图9中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为终端设备的收发单元，将具有处理功能的处理器视为终端设备的处理单元。如图9所示，终端设备包括收发单元910和处理单元920。收发单元也可以称为收发器、收发机、收发装置等。处理单元也可以 称为处理器，处理单板，处理模块、处理装置等。可选的，可以将收发单元910中用于实现接收功能的器件视为接收单元，将收发单元910中用于实现发送功能的器件视为发送单元，即收发单元910包括接收单元和发送单元。收发单元有时也可以称为收发机、收发器、或收发电路等。接收单元有时也可以称为接收机、接收器、或接收电路等。发送单元有时也可以称为发射机、发射器或者发射电路等。应理解，收发单元910用于执行上述方法实施例中终端设备侧的发送操作和接收操作，处理单元920用于执行上述方法实施例中终端设备上除了收发操作之外的其他操作。
本申请实施例还提供另一种通信装置，请参考图10，为本申请实施例提供的一种通信装置的结构示意图，该通信装置1000包括：收发模块1010和处理模块1020。该通信装置可用于实现上述任一方法实施例中涉及网络设备的功能。例如，该通信装置可以是网络设备或网络设备中包括的芯片。
示例性的，当该通信装置作为网络设备，执行图2中所示的方法实施例时，收发模块1010用于，从终端设备接收第一报告，该第一报告中包括第一指示信息，该第一指示信息用于确定终端设备与源网络设备之间的连接失败是否发生在终端设备接入到目标网络设备之前；处理模块1020用于，通过收发模块1010向源网络设备发送该第一报告。
在一种可能的设计中，终端设备与源网络设备之间的连接失败可以发生在终端设备在接入到目标网络设备之前；相应的，第一报告中还可包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第三时间段信息，该第三时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备接入到目标网络设备之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段。
在一种可能的设计中，终端设备与源网络设备之间的连接失败也可以发生在终端设备接入到目标网络设备之后；相应的，第一报告中还包括下列时间段信息中的一项或多项：
第一时间段信息，该第一时间段信息用于指示终端设备接收到第一消息至终端设备检测到与源网络设备之间的连接失败之间的时间段，该第一消息用于使得终端设备由源网络设备切换到目标网络设备；第二时间段信息，该第二时间段信息用于指示终端设备检测到与源网络设备之间的连接失败至终端设备发送所述第一报告之间的时间段；第四时间段信息，该第四时间段信息用于指示终端设备接入到目标网络设备至终端设备发送第一报告之间的时间段；第五时间段信息，该第五时间段信息用于指示终端设备接收到第一消息至终端设备接入到目标网络设备之间的时间段；第六信息段信息，该第六时间段信息用于指示终端设备接入到目标网络设备至终端设备检测到与源网络设备之间的连接失败之间的时间段。
在一种可能的设计中，第一报告还可包括第二指示信息；其中，该第二指示信息用于指示终端设备在条件切换的触发条件满足前，检测到与源网络设备之间的连接失败，或者该第二指示信息用于指示终端设备在条件切换的触发条件满足后且接入到目标网络设备前，检测到与源网络设备之间的连接失败，或者，该第二指示信息用于指示终端设备在触发条件满足后且接入到目标网络设备之后，检测到与源网络设备之间的连接失败。
在一种可能的设计中，第一报告中还可包括下列信息中的一项或多项：源网络设备和/或目标网络设备的小区信息、源网络设备和/或目标网络设备在至少一个时间点对应的小区质量信息。
在一种可能的设计中，第一报告中还包括至少一个时间点的信息，该至少一个时间点包括下列时间点中的一个或多个：终端设备接收到第一消息的时间点、终端设备检测到与源网络设备之间的连接失败的时间点、终端设备接入到目标网络设备的时间点、条件切换的触发条件被满足时的时间点、终端设备发送第一报告的时间点。
在一种可能的设计中，第一报告中还可包括切换类型信息，该切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。
应理解，该通信装置中涉及的处理模块1020可以由至少一个处理器或处理器相关电路组件实现，收发模块1010可以由至少一个收发器或收发器相关电路组件或通信接口实现。该通信装置中的各个模块的操作和/或功能分别为了实现图2、图3、图4、图6或图7中所示方法的相应流程，为了简洁，在此不再赘述。可选的，该通信装置中还可以包括存储模块，该存储模块可以用于存储数据和/或指令，收发模块1010和/或处理模块1020可以读取存取模块中的数据和/或指令，从而使得通信装置实现相应的方法。该存储模块例如可以通过至少一个存储器实现。
上述存储模块、处理模块和收发模块可以分离存在，也可以全部或者部分模块集成，例如存储模块和处理模块集成，或者处理模块和收发模块集成等。
请参考图11，为本申请实施例中提供的一种通信装置的另一结构示意图。该通信装置可具体为一种网络设备，例如基站，用于实现上述任一方法实施例中涉及网络设备的功能。
该网络设备包括：一个或多个射频单元，如远端射频单元(remote radio unit，RRU)1101和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元，digital unit，DU)1102。所述RRU 1101可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线11011和射频单元11012。所述RRU 1101部分主要用于射频信号的收发以及射频信号与基带信号的转换。所述BBU 1102部分主要用于进行基带处理，对基站进行控制等。所述RRU 1101与BBU 1102可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1102为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)1102可以用于控制基站执行上述方法实施例中关于网络设备的操作流程。
在一个示例中，所述BBU 1102可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 1102还可以包括存储器11021和处理器11022，所述存储器11021用于存储必要的指令和数据。所述处理器11022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中发送操作。所述存储器11021和处理器11022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
本申请实施例还提供另一种通信装置，请参考图12，为本申请实施例提供的一种通信 装置的结构示意图，该通信装置1200包括：收发模块1210和处理模块1220。该通信装置可用于实现上述任一方法实施例中涉及核心网设备的功能。例如，该通信装置可以是网络设备或核心网设备中包括的芯片。
示例性的，当该通信装置作为核心网设备，执行上述方法实施例时，收发模块1210用于从第三网络设备接收第一报告；处理模块1220用于通过所述收发模块1210向源网络设备发送该第一报告，所述第一报告可以为上述各方法实施例中所述的任一种第一报告。
在一种可能的设计中，所述收发模块1210还用于，向源网络设备发送所述终端设备的能力信息，所述能力信息用于指示所述终端设备是否支持记录所述第一报告。
请参考图13，为本申请实施例提供的另一种通信装置的结构示意图。该通信装置1300可用于实现上述方法实施例中描述的核心网设备执行的方法。该通信装置1300可以是芯片或核心网设备。
通信装置1300包括一个或多个处理器1301，该一个或多个处理器1301可支持通信装置1300实现上述方法实施例中的核心网设备的方法。处理器1301可以是通用处理器或者专用处理器。例如，处理器1301可以是中央处理器(central processing unit，CPU)或基带处理器。基带处理器可以用于处理通信数据，CPU可以用于对通信装置(例如，网络设备、终端设备或芯片)进行控制，执行软件程序，处理软件程序的数据。通信装置1300还可以包括收发单元1305，用以实现信号的输入(接收)和输出(发送)。
例如，通信装置1300可以是芯片，收发单元1305可以是该芯片的输入和/或输出电路，或者，收发单元1305可以是该芯片的通信接口，该芯片可以作为终端设备或网络设备或其它无线通信设备的组成部分。
通信装置1300中可以包括一个或多个存储器1302，其上存有程序1304，程序1304可被处理器1301运行，生成指令1303，使得处理器1301根据指令1303执行上述方法实施例中描述的方法。可选地，存储器1302中还可以存储有数据。可选地，处理器1301还可以读取存储器1302中存储的数据，该数据可以与程序1304存储在相同的存储地址，该数据也可以与程序1304存储在不同的存储地址。
处理器1301和存储器1302可以单独设置，也可以集成在一起，例如，集成在单板或者系统级芯片(system on chip，SOC)上。
该通信装置1300还可以包括收发单元1305以及天线1306。收发单元1305可以称为收发机、收发电路或者收发器，用于通过天线1306实现通信装置的收发功能。本申请实施例还提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得该芯片系统实现上述任一方法实施例中的方法。
可选地，该芯片系统中的处理器可以为一个或多个。该处理器可以通过硬件实现也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在一起，也可以和处理器分离设置，本申请并不限定。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型，以及存储器与处理器的设置方式不作具体限定。
示例性的，该芯片系统可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
应理解，上述方法实施例中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请实施例还提供一种计算机可读存储介质，所述计算机存储介质中存储有计算机可读指令，当计算机读取并执行所述计算机可读指令时，使得计算机执行上述任一方法实施例中的方法。
本申请实施例还提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述任一方法实施例中的方法。
本申请实施例还提供一种通信系统，该通信系统包括终端设备和第三网络设备。可选的，该通信系统中还可包括源网络设备、目标网络设备，所述第三网络设备可以与源网络设备或目标网络设备为同一网络设备，所述第三网络设备也可以为区别于源网络设备和目标网络设备的其他网络设备。可选的，所述通信系统中还可包括核心网设备。
应理解，本申请实施例中提及的处理器可以是中央处理单元(central processing unit，CPU)，还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
需要说明的是，当处理器为通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件时，存储器(存储模块)集成在处理器中。
应注意，本文描述的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，在本申请的各种实施例中涉及的各种数字编号仅为描述方便进行的区分，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻 辑确定，而不应对本发明实施例的实施过程构成任何限定。
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所述以权利要求的保护范围为准。

Claims (23)

  1. 一种通信方法，其特征在于，所述方法包括：
    从源网络设备接收第一消息，所述第一消息用于使得终端设备由所述源网络设备切换到目标网络设备；
    接收到所述第一消息后，保持所述终端设备与所述源网络设备之间的数据传输；
    检测到所述终端设备与所述源网络设备之间的连接失败；
    发送第一报告，所述第一报告中包括第一指示信息，所述第一指示信息用于确定所述终端设备与所述源网络设备之间的连接失败是否发生在所述终端设备接入到所述目标网络设备之前。
  2. 根据权利要求1所述的方法，其特征在于，所述检测到所述终端设备与所述源网络设备之间的连接失败，包括：
    在所述终端设备接入到所述目标网络设备之前，检测到所述终端设备与所述源网络设备之间的连接失败；
    所述第一报告中还包括下列时间段信息中的一项或多项：
    第一时间段信息，所述第一时间段信息用于指示接收到所述第一消息至检测到所述终端设备与所述源网络设备之间的连接失败之间的时间段；
    第二时间段信息，所述第二时间段信息用于指示检测到所述终端设备与所述源网络设备之间的连接失败至发送所述第一报告之间的时间段；
    第三时间段信息，所述第三时间段信息用于指示检测到所述终端设备与所述源网络设备之间的连接失败至所述终端设备接入到所述目标网络设备之间的时间段；
    第四时间段信息，所述第四时间段信息用于指示所述终端设备接入到所述目标网络设备至发送所述第一报告之间的时间段。
  3. 根据权利要求1所述的方法，其特征在于，所述检测到所述终端设备与所述源网络设备之间的连接失败，包括：
    在所述终端设备接入到所述目标网络设备之后，检测到所述终端设备与所述源网络设备之间的连接失败；
    所述第一报告中还包括下列时间段信息中的一项或多项：
    第一时间段信息，所述第一时间段信息用于指示接收到所述第一消息至检测到所述终端设备与所述源网络设备之间的连接失败之间的时间段；
    第二时间段信息，所述第二时间段信息用于指示检测到所述终端设备与所述源网络设备之间的连接失败至发送所述第一报告之间的时间段；
    第四时间段信息，所述第四时间段信息用于指示所述终端设备接入到所述目标网络设备至发送所述第一报告之间的时间段；
    第五时间段信息，所述第五时间段信息用于指示接收到所述第一消息至所述终端设备接入到所述目标网络设备之间的时间段；
    第六信息段信息，所述第六时间段信息用于指示所述终端设备接入到所述目标网络设备至检测到所述终端设备与所述源网络设备之间的连接失败之间的时间段。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：
    从所述源网络设备接收条件切换配置信息，所述条件切换配置信息包括条件切换的触 发条件和至少一个候选的目标网络设备；
    若所述触发条件被满足，从所述至少一个候选的目标网络设备中确定所述目标网络设备；
    所述第一报告还包括第二指示信息，其中，所述第二指示信息用于指示在所述触发条件满足前，检测到所述终端设备与所述源网络设备之间的连接失败，或者，所述第二指示信息用于指示在所述触发条件满足后且所述终端设备接入到所述目标网络设备前，检测到所述终端设备与所述源网络设备之间的连接失败，或者，所述第二指示信息用于指示在所述触发条件满足后且所述终端设备接入到所述目标网络设备之后，检测到所述终端设备与所述源网络设备之间的连接失败。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一报告中还包括下列信息中的一项或多项：
    所述源网络设备和/或所述目标网络设备的小区信息、所述源网络设备和/或所述目标网络设备在至少一个时间点对应的小区质量信息。
  6. 根据权利要求5所述的方法，其特征在于，所述第一报告中还包括所述至少一个时间点的信息，所述至少一个时间点包括下列时间点中的一个或多个：
    接收到所述第一消息的时间点、检测到所述终端设备与所述源网络设备之间的连接失败的时间点、所述终端设备接入到所述目标网络设备的时间点、条件切换的触发条件被满足时的时间点、发送所述第一报告的时间点。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述第一报告中还包括切换类型信息，所述切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    从所述源网络设备接收第三指示信息，所述第三指示信息用于指示是否需要记录所述第一报告。
  9. 根据权利要求8所述的方法，其特征在于，所述第三指示信息用于指示是否需要记录所述第一报告，包括：
    所述第三指示信息用于指示在所述终端设备与所述源网络设备之间的连接失败发生在所述终端设备接入到所述目标网络设备之前的情况下，是否需要记录所述第一报告；或者，
    所述第三指示信息用于指示在所述终端设备与所述源网络设备之间的连接失败发生在所述终端设备接入到所述目标网络设备之后的情况下，是否需要记录所述第一报告；或者，
    所述第三指示信息用于指示在所述终端设备从所述目标网络设备接收到所述第一释放消息时，所述终端设备与所述源网络设备之间的连接未发生失败的情况下，是否需要记录所述第一报告；或者，
    所述第三指示信息用于指示在切换类型为DAPS切换与条件切换的结合的情况下，是否需要记录所述第一报告；或者，
    所述第三指示信息用于指示在切换类型为DAPS切换时，所述终端设备与所述源网络设备之间的连接失败发生在第一时间点之前的情况下，是否需要记录所述第一报告。
  10. 一种通信方法，其特征在于，所述方法包括：
    从终端设备接收第一报告，所述第一报告中包括第一指示信息和/或第七指示信息，所 述第一指示信息用于确定所述终端设备与源网络设备之间的连接失败是否发生在所述终端设备接入到目标网络设备之前，所述第七指示信息用于指示所述终端设备和所述源网络设备之间的连接恢复是否成功；或者，所述第七指示信息用于指示所述终端设备和所述源网络设备之间的连接恢复成功后是否发生连接失败；
    向所述源网络设备发送所述第一报告。
  11. 根据权利要求10所述的方法，其特征在于，所述终端设备与所述源网络设备之间的连接失败发生在所述终端设备在接入到所述目标网络设备之前；
    所述第一报告中还包括下列时间段信息中的一项或多项：
    第一时间段信息，所述第一时间段信息用于指示所述终端设备接收到第一消息至所述终端设备检测到与所述源网络设备之间的连接失败之间的时间段，所述第一消息用于使得所述终端设备由所述源网络设备切换到所述目标网络设备；
    第二时间段信息，所述第二时间段信息用于指示所述终端设备检测到与所述源网络设备之间的连接失败至所述终端设备发送所述第一报告之间的时间段；
    第三时间段信息，所述第三时间段信息用于指示所述终端设备检测到与所述源网络设备之间的连接失败至所述终端设备接入到所述目标网络设备之间的时间段；
    第四时间段信息，所述第四时间段信息用于指示所述终端设备接入到所述目标网络设备至所述终端设备发送所述第一报告之间的时间段。
  12. 根据权利要求10所述的方法，其特征在于，所述终端设备与所述源网络设备之间的连接失败发生在所述终端设备接入到所述目标网络设备之后；
    所述第一报告中还包括下列时间段信息中的一项或多项：
    第一时间段信息，所述第一时间段信息用于指示终端设备接收到第一消息至检测到所述终端设备与所述源网络设备之间的连接失败之间的时间段，所述第一消息用于使得所述终端设备由所述源网络设备切换到所述目标网络设备；
    第二时间段信息，所述第二时间段信息用于指示检测到所述终端设备与所述源网络设备之间的连接失败至发送所述第一报告之间的时间段；
    第四时间段信息，所述第四时间段信息用于指示所述终端设备接入到所述目标网络设备至所述终端设备发送所述第一报告之间的时间段；
    第五时间段信息，所述第五时间段信息用于指示所述终端设备接收到所述第一消息至所述终端设备接入到所述目标网络设备之间的时间段；第六信息段信息，所述第六时间段信息用于指示所述终端设备接入到所述目标网络设备至所述终端设备检测到与所述源网络设备之间的连接失败之间的时间段。
  13. 根据权利要求10至12中任一项所述的方法，其特征在于，所述第一报告还包括第二指示信息；
    其中，所述第二指示信息用于指示所述终端设备在条件切换的触发条件满足前，检测到与所述源网络设备之间的连接失败，或者所述第二指示信息用于指示所述终端设备在所述触发条件满足后且接入到所述目标网络设备前，检测到与所述源网络设备之间的连接失败，或者，所述第二指示信息用于指示所述终端设备在所述触发条件满足后且接入到所述目标网络设备之后，检测到与所述源网络设备之间的连接失败。
  14. 根据权利要求10至13中任一项所述的方法，其特征在于，所述第一报告中还包括 下列信息中的一项或多项：
    所述源网络设备和/或所述目标网络设备的小区信息、所述源网络设备和/或所述目标网络设备在至少一个时间点对应的小区质量信息。
  15. 根据权利要求14所述的方法，其特征在于，所述第一报告中还包括所述至少一个时间点的信息，所述至少一个时间点包括下列时间点中的一个或多个：
    所述终端设备接收到第一消息的时间点、所述终端设备检测到与所述源网络设备之间的连接失败的时间点、所述终端设备接入到所述目标网络设备的时间点、条件切换的触发条件被满足时的时间点、所述终端设备发送所述第一报告的时间点。
  16. 根据权利要求10至15中任一项所述的方法，其特征在于，所述第一报告中还包括切换类型信息，所述切换类型信息用于指示普通切换、双激活协议栈DAPS切换、条件切换、DAPS切换与条件切换的结合中的任一种切换类型。
  17. 一种通信装置，其特征在于，所述装置包括用于执行如权利要求1至9中任一项所述的方法的各步骤的单元，或者包括用于执行如权利要求10至16中任一项所述的方法的各步骤的单元。
  18. 一种通信装置，其特征在于，所述装置包括至少一个处理器，所述至少一个处理器与至少一个存储器耦合：
    所述至少一个处理器，用于执行所述至少一个存储器中存储的计算机程序或指令，以使得所述装置执行如权利要求1至9中任一项所述的方法，或者使得所述装置执行如权利要求10至16中任一项所述的方法。
  19. 一种计算机可读存储介质，其特征在于，用于存储指令，当所述指令被执行时，使如权利要求1至9中任一项所述的方法被实现，或者使如权利要求10至16中任一项所述的方法被实现。
  20. 一种通信装置，其特征在于，包括处理器和接口电路；
    所述接口电路，用于交互代码指令至所述处理器；
    所述处理器用于运行所述代码指令以执行如权利要求1至9中任一项所述的方法，或者所述处理器用于运行所述代码指令以执行如权利要求10至16中任一项所述的方法。
  21. 一种计算机程序产品，其特征在于，当计算机读取并执行所述计算机程序产品时，使得计算机执行如权利要求1至9中任一项所述的方法，或者执行如权利要求10至16中任一项所述的方法。
  22. 一种通信系统，其特征在于，所述系统包括终端设备和第三网络设备，所述终端设备用于执行如权利要求1至9中任一项所述的方法，所述第三网络设备用于执行如权利要求10至16中任一项所述的方法。
  23. 根据权利要求22所述的系统，其特征在于，所述系统中还包括源网络设备、目标网络设备和核心网设备中的一项或多项；
    所述第三网络设备与所述源网络设备或所述目标网络设备为同一网络设备，或者所述第三网络设备为区别于所述源网络设备和所述目标网络设备的网络设备。
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