WO2024093931A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2024093931A1
WO2024093931A1 PCT/CN2023/127825 CN2023127825W WO2024093931A1 WO 2024093931 A1 WO2024093931 A1 WO 2024093931A1 CN 2023127825 W CN2023127825 W CN 2023127825W WO 2024093931 A1 WO2024093931 A1 WO 2024093931A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
information
threshold value
node
timer
Prior art date
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PCT/CN2023/127825
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English (en)
French (fr)
Inventor
王凡凡
耿婷婷
陈君
胡星星
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华为技术有限公司
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Publication of WO2024093931A1 publication Critical patent/WO2024093931A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure

Definitions

  • the present application relates to the field of communication technology, and in particular to a communication method and device.
  • the fast MCG link recovery process means that when a terminal device detects that an RLF occurs between the terminal device and the master node, the terminal device can perform signaling interaction with the master node through the auxiliary node to restore the RRC connection with the master node.
  • the embodiments of the present application provide a communication method and device, which are beneficial to improving the probability of success of the fast MCG link recovery process.
  • an embodiment of the present application provides a communication method that can be applied to a terminal device (e.g., a device or chip of a terminal device).
  • a terminal device e.g., a device or chip of a terminal device.
  • the terminal device when RLF occurs between a terminal device and a primary node, the terminal device sends a primary cell group failure message to the primary node through a secondary node; wherein the primary cell group failure message is used to request execution of a fast primary cell group link recovery; within a first time after the primary cell group failure message is sent, the terminal device receives a first message from the primary node through the secondary node; wherein the first message includes a switching message or an RRC release message; when a trigger condition is met, the terminal device records a first report; wherein the first report is used to indicate relevant information in the process of executing fast MCG link recovery; further, the terminal device sends the first report to the primary node and/or the secondary node.
  • the terminal device when the fast MCG link recovery is successful and the triggering condition for recording the first report is met, the terminal device will record and report the relevant information in the process of executing the fast MCG link recovery, so that the network device (primary node and/or secondary node) can optimize the configuration of the fast MCG link recovery (such as the configuration of the timer and the mobility parameter configuration of the secondary cell group) according to the relevant information in the process of executing the fast MCG link recovery, thereby improving the probability of success of the fast MCG link recovery process and reducing the delay of the transmission recovery of the primary cell group.
  • the mobility parameters are parameters that may be used in the judgment of the switching process, such as the signal threshold of the switching, etc.
  • the terminal device receives a configuration message from the master node, the configuration message being used to configure recording the first report when fast MCG link recovery is successful and a trigger condition is satisfied; wherein the configuration message includes the trigger condition.
  • the terminal device upon receiving the configuration message from the master node, the terminal device will record the first report only when fast MCG link recovery is successful and the trigger condition is satisfied, thereby improving the flexibility of recording the first report.
  • the first report includes one or more of the following information: the running time of the first timer, identification information of the primary and secondary cells, trigger condition indication information of the first report, measurement information of the secondary cell group, and information of the terminal device randomly accessing the secondary node; wherein, the running time of the first timer is the time between the moment when the terminal device sends the primary cell group failure information and the moment when the terminal device receives the first message.
  • the information of the terminal device randomly accessing the auxiliary node includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for random access attempts, the amount of data to be transmitted for two-step random access, and one or more of the physical uplink shared channel (PUSCH) configuration information for two-step random access.
  • cell identification information for random access includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets a quality threshold, beam information for random access attempts, the amount of data to be transmitted for two-step random access, and one or more of the physical uplink shared channel (PUSCH) configuration information for two-step random access.
  • PUSCH physical uplink shared channel
  • the triggering condition includes one or more of the following items:
  • the running time of the first timer is less than the first threshold value and greater than or equal to the second threshold value, and the running time of the first timer is the time between the terminal device sending the primary cell group failure information and the moment when the terminal device receives the first message; wherein the second threshold value is the sum of the first threshold value and The product of the first coefficient, the first coefficient is a positive number less than 1; or the second threshold value is a value less than the first threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the primary node, and the running time of the second timer corresponding to the secondary node is less than the third threshold value and greater than or equal to the fourth threshold value;
  • the running time of the second timer is: the time from when the terminal device detects that there is a physical layer desynchronization problem with the secondary node to when the terminal device detects that the wireless link between the terminal device and the secondary node is restored; wherein the fourth threshold value is the product of the third threshold value and the second coefficient, and the second coefficient is a positive number less than 1; or, the fourth threshold value is a value less than the third threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the primary node, and the running time of the third timer corresponding to the secondary node is less than the fifth threshold value and greater than or equal to the sixth threshold value, and the running time of the third timer is: during the operation of the second timer, the time between the terminal device triggering the measurement report and the terminal device detecting the recovery of the radio link with the secondary node; wherein the sixth threshold value is the product of the fifth threshold value and the third coefficient, and the third coefficient is a positive number less than 1; or, the sixth threshold value is a value less than the fifth threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the primary node, and the number of random access message transmissions between the terminal device and the secondary node is less than the seventh threshold value and greater than or equal to the eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and the fourth coefficient, and the fourth coefficient is a positive number less than 1; or, the eighth threshold value is less than the seventh threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the primary node, and the terminal device detects indication information from the radio link control layer of the secondary node, where the indication information is used to indicate that the number of repeated transmissions occurring at the radio link control layer is less than a ninth threshold value and is greater than or equal to a tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and the fifth coefficient, and the fifth coefficient is a positive number less than 1; or, the tenth threshold value is less than the ninth threshold value;
  • the terminal device detects that RLF occurs between it and the primary node, and the number of consecutive failures of executing uplink Listen Before Talk (LBT) on the secondary node is less than the eleventh threshold value and greater than or equal to the twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and the sixth coefficient, and the sixth coefficient is a positive number less than 1; or, the twelfth threshold value is less than the eleventh threshold value.
  • LBT uplink Listen Before Talk
  • the first report also includes one or more of the following information: the running length of the second timer, the running length of the third timer, the number of random access message transmissions between the terminal device and the secondary node, the number of repeated transmissions occurring in the wireless link control layer of the secondary node, and the number of consecutive failures of performing LBT on the secondary node.
  • the terminal device when RLF occurs between the terminal device and the master node, the terminal device records the RLF report; if the terminal device receives a first message from the master node through the secondary node within the first time after sending the primary cell group failure information, the terminal device releases the RLF report.
  • the main cell group failure information includes one or more of the following information: information about the first cell, the first cell is the main cell where the terminal device detects that RLF has occurred; information about the second cell, the second cell is the source main cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, the first time information is used to indicate the duration between the moment when the terminal device received the last switching command and the moment of RLF; second time information, the second time information is used to indicate the duration between the moment when the terminal device received the last conditional switching command and the time of RLF; information about the terminal device randomly accessing the main node; first indication information, the first indication information is used to indicate that as of the time of RLF, the main node measured by the terminal device is the first candidate cell for conditional switching configured for the terminal device; and/or, the switching trigger condition of the first candidate cell; second indication information, the second indication information is used to indicate the second candidate cell measured by the terminal device other than the first candidate cell.
  • the main cell group failure information is enhanced to ensure that the master node can obtain complete main cell group RLF information when fast MCG link recovery is successful, so that the master node can optimize the mobility parameters related to the main cell group according to the main cell group RLF information, thereby reducing the probability of RLF occurring in the main cell group and reducing the service interruption time of the main cell group.
  • the information of the terminal device randomly accessing the main node includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the present application also provides a communication processing method, which corresponds to the communication method of the first aspect, and is described from the master node side (applicable to the device or chip of the master node).
  • the master node receives the main cell group failure information from the terminal device through the auxiliary node; wherein the main cell group failure information is used to request the execution of fast MCG link recovery; the master node sends a first message to the terminal device through the auxiliary node; wherein the first message includes a switching message or an RRC release message; when the terminal device meets the trigger condition, the master node receives a first report from the terminal device, and the first report is used to indicate the relevant information in the process of executing fast MCG link recovery.
  • the beneficial effects of the method provided in the second aspect can refer to the beneficial effects of the method provided in the first aspect, and will not be described in detail.
  • the master node sends a configuration message to the terminal device, where the configuration message is used to configure recording of a first report when fast MCG link recovery is successful and a trigger condition is met; wherein the configuration message includes the trigger condition.
  • the present application also provides a communication processing method, which corresponds to the communication method of the first and second aspects, and is described from the auxiliary node side (applicable to the device or chip of the auxiliary node).
  • the auxiliary node receives the main cell group failure information from the terminal device, and sends the main cell group failure information to the main node; wherein the main cell group failure information is used to request the execution of fast MCG link recovery;
  • the auxiliary node receives a first message from the main node, and sends the first message to the terminal device; wherein the first message includes a switching message or an RRC release message; when the terminal device meets the trigger condition, the auxiliary node receives a first report from the terminal device, and the first report is used to indicate the relevant information in the process of executing fast MCG link recovery.
  • beneficial effects of the method provided in the third aspect can be referred to the beneficial effects of the method provided in the first aspect, and will not be described in detail.
  • the content of the first report can refer to the implementation method of the first report in the first aspect
  • the content of the trigger condition can refer to the implementation method of the trigger condition in the first aspect
  • the content of the main cell group failure information can refer to the implementation method of the main cell group failure information in the first aspect; it will not be repeated here.
  • an embodiment of the present application provides a communication method that can be applied to a terminal device (eg, a device or chip of a terminal device).
  • the terminal device determines the main cell group failure information; and sends the main cell group failure information to the main node through the auxiliary node; wherein the main cell group failure information includes one or more of the following information: information of the first cell, the first cell is the main cell where the terminal device detects that RLF occurs; information of the second cell, the second cell is the source main cell of the last switching command received by the terminal device; RLF cause indication information; first time information; the first time information is used to indicate the duration between the moment of the last switching command received by the terminal device and the moment of RLF; second time information, the second time information is used to indicate the duration between the moment of the last conditional switching command received by the terminal device and the moment of RLF; information of the terminal device randomly accessing the main node; first indication information, the first indication information
  • the main cell group failure information is enhanced to ensure that the master node can obtain complete main cell group RLF information when fast MCG link recovery is successful, so that the master node can optimize the main cell group mobility parameters according to the main cell group RLF information, thereby reducing the probability of main cell group RLF and reducing the main cell group service interruption time.
  • the information of the terminal device randomly accessing the main node includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the terminal device when RLF occurs between the terminal device and the primary node, the terminal device records the RLF report; if the terminal device receives a first message from the primary node through the secondary node within the first time after sending the primary cell group failure information, the RFL report is released; wherein the first message includes a switching message or an RRC release message.
  • an embodiment of the present application further provides a communication processing method, which corresponds to the communication method of the third aspect and is described from the master node side (applicable to the device or chip of the master node).
  • the main node receives the main cell group failure information from the terminal device through the auxiliary node; wherein the main cell group failure information includes one or more of the following information: information of the first cell, the first cell is the main cell where the terminal device detects that RLF occurs; information of the second cell, the second cell is the source main cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, the first time information is used to indicate the duration between the moment of the last switching command received by the terminal device and the moment of RLF; second time information, the second time information is used to indicate the duration between the moment of the last conditional switching command received by the terminal device and the time of RLF; information of the terminal device randomly accessing the main node
  • beneficial effects of the method provided in the fifth aspect can be referred to the beneficial effects of the method provided in the fourth aspect, which will not be repeated here.
  • the information of the terminal device randomly accessing the main node includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the embodiment of the present application also provides a communication processing method, which corresponds to the communication method of the fourth and fifth aspects, and is described from the auxiliary node side (applicable to the device or chip of the auxiliary node).
  • the auxiliary node receives the main cell group failure information from the terminal device and sends the main cell group failure information to the main node; wherein the main cell group failure information includes one or more of the following information: information of the first cell, the first cell is the main cell corresponding to the main node; information of the second cell, the second cell is the source main cell in the last switching command received by the terminal device before the RLF; first time information; the first time information is used to indicate the duration between the moment of the last switching command received by the terminal device and the moment of RLF; information of the terminal device randomly accessing the main node; first indication information, the first indication information is used to indicate whether the cell measured by the terminal device is the first candidate cell for conditional switching configured by the
  • beneficial effects of the method provided in the sixth aspect can be referred to the beneficial effects of the method provided in the fourth aspect, which will not be repeated here.
  • the information of the terminal device randomly accessing the main node includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the present application provides a communication device, which may be a device in a terminal device, or a device that can be used in combination with a terminal device.
  • the communication device may also be a chip or a chip system.
  • the communication device may execute the method described in the first aspect or the third aspect.
  • the functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations.
  • the hardware or software includes one or more units corresponding to the above functions.
  • the unit may be software and/or hardware.
  • the operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the first aspect or the fourth aspect above, and the repetitive parts will not be repeated.
  • the present application provides a communication device, which may be a device in a master node, or a device that can be used in combination with a master node.
  • the communication device may also be a chip system.
  • the communication device may execute the method described in the second aspect or the fourth aspect.
  • the functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations.
  • the hardware or software includes one or more units corresponding to the above functions.
  • the unit may be software and/or hardware.
  • the operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the second aspect or the fifth aspect above, and the repetitive parts will not be repeated.
  • the present application provides a communication device, which may be a device in a secondary node, or a device that can be used in combination with a secondary node.
  • the communication device may also be a chip system.
  • the communication device may execute the method described in the fifth aspect.
  • the functions of the communication device may be implemented by hardware, or by hardware executing corresponding software implementations.
  • the hardware or software includes one or more units corresponding to the above functions.
  • the unit may be software and/or hardware.
  • the operations and beneficial effects performed by the communication device may refer to the methods and beneficial effects described in the third aspect or the sixth aspect above, and the repetitive parts will not be repeated.
  • the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store computer execution instructions.
  • the method executed by the terminal device in the method described in the first aspect or the fourth aspect is implemented; or, the method executed by the master node in the method described in the second aspect or the fifth aspect is implemented; or, the method executed by the slave node in the method described in the third aspect or the sixth aspect is implemented.
  • the present application provides a computer program product comprising a computer program.
  • the computer program When the computer program is executed, the method executed by the terminal device in the method described in the first aspect or the fourth aspect is implemented; or, the method executed by the master node in the method described in the second aspect or the fifth aspect is implemented; or, the method executed by the slave node in the method described in the third aspect or the sixth aspect is implemented.
  • the present application provides a communication system, the communication system comprising a device corresponding to a secondary node and a device corresponding to a primary node.
  • the communication system may also comprise a communication device corresponding to a terminal device.
  • FIG1 is a schematic diagram of a system architecture provided by an embodiment of the present application.
  • FIG2 is a schematic diagram of the structure of a network device provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of the structure of another network device provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of a CHO process provided in an embodiment of the present application.
  • FIG5 is a schematic diagram of the architecture of each cell in an MR-DC provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of a process of fast primary cell group link recovery provided in an embodiment of the present application.
  • FIG7 is a flow chart of a communication method provided in an embodiment of the present application.
  • FIG8a is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application.
  • FIG8b is a flow chart of another communication method provided in an embodiment of the present application.
  • FIG9 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • FIG. 10 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • At least one (item) means one or more
  • “more than one” means two or more
  • “at least two (items)” means two or three and more than three
  • and “and/or” is used to describe the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural.
  • the character “/” generally indicates that the previous and next associated objects are in an “or” relationship.
  • “At least one of the following items” or similar expressions refers to any combination of these items, including any combination of single items or plural items.
  • At least one of a, b or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c", where a, b, c can be single or multiple.
  • the embodiments of the present application can be applied to communication systems evolved after 5G, such as long term evolution (LTE) system, fifth generation mobile communication (5G) system, sixth generation mobile communication (6G) system, satellite communication and short-distance wireless communication systems.
  • LTE long term evolution
  • 5G fifth generation mobile communication
  • 6G sixth generation mobile communication
  • satellite communication short-distance wireless communication systems.
  • the wireless communication systems mentioned in the embodiments of the present application include but are not limited to: narrow band Internet of Things (NB-IoT) system, three major application scenarios of 5G/6G mobile communication system: enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC) and massive machine type communication (mMTC), wireless fidelity (WiFi) system.
  • NB-IoT narrow band Internet of Things
  • eMBB enhanced mobile broadband
  • URLLC ultra reliable low latency communication
  • mMTC massive machine type communication
  • WiFi wireless fidelity
  • the wireless communication system may include one or more network devices, and one or more terminal devices.
  • the wireless communication system may also perform point-to-point communication, such as communication between multiple terminal devices.
  • the following is an exemplary explanation of the system architecture shown in FIG1.
  • two network devices i.e., network device 1 and network device 2
  • one terminal device i.e., terminal device 1
  • the terminal devices and network devices involved in the system architecture in FIG1 are described in detail below.
  • the terminal device includes a device that provides voice and/or data connectivity to the user, for example, the terminal device is a device with wireless transceiver function.
  • the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).
  • the terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), a wearable terminal, etc.
  • the embodiments of the present application do not limit the application scenarios.
  • Terminal devices may also be sometimes referred to as terminals, user equipment (UE), access terminals, vehicle-mounted terminals, industrial control terminals, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, wireless communication devices, etc. Terminal devices may also be fixed or mobile. It is understood that all or part of the functions of the terminal devices in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).
  • a platform e.g., a cloud platform
  • the network device is a device with wireless transceiver function, which is used to communicate with the terminal device.
  • the network device is a radio access network (RAN) node that connects the terminal device to the wireless network.
  • RAN nodes include but are not limited to: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), etc. BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), base band unit (BBU), or wireless fidelity (Wifi) access point (AP), integrated access and backhaul (IAB), etc.
  • TRP transmission reception point
  • eNB evolved Node B
  • RNC radio network controller
  • NB Node B
  • BSC base station controller
  • BTS base transceiver station
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • BBU base band unit
  • a network device may include a centralized unit (CU) and/or a distributed unit (DU).
  • CU centralized unit
  • DU distributed unit
  • the network device includes a CU and a DU.
  • the CU can be divided into a control plane and a user plane, that is, the CU includes a CU-CP and a CU-UP.
  • the CU-CP is responsible for the control plane function, which mainly includes the RRC layer and the packet data convergence protocol-control plane (PDCP-C) layer functions.
  • the PDCP-C is mainly responsible for the encryption and decryption, integrity protection, and data transmission of the control plane data.
  • the CU-UP is responsible for the user plane function, which mainly includes the service data adaptation protocol (SDAP) layer and the packet data convergence protocol-user plane (PDCP-U) functions.
  • SDAP service data adaptation protocol
  • PDCP-U packet data convergence protocol-user plane
  • the SDAP is mainly responsible for processing the data of the core network and mapping it to the bearer.
  • the PDCP-U is mainly responsible for the encryption and decryption, integrity protection, header compression, sequence number maintenance, and data transmission of the data plane.
  • CU-CP and CU-UP are connected through the E1 interface
  • CU-CP is connected to DU through the F1-C interface
  • CU-UP is connected to DU through the F1-U interface.
  • PDCP-C is also in CU-UP.
  • DU includes radio link control (RLC) layer, media access control (MAC) layer and physical (PHY) layer functions.
  • the network device includes a CU and two DUs.
  • the CU includes RRC layer, SDAP layer and PDCP layer functions, and the DU includes RLC layer, MAC layer and PHY layer functions.
  • the CU is connected to the two DUs via an F1 interface.
  • Network devices can communicate and interact with core network devices to provide communication services to terminal devices.
  • Core network devices are, for example, devices in the 5G core network (CN).
  • CN 5G core network
  • the core network provides an interface to the data network, provides communication connection, authentication, management, policy control, and data service bearing for the terminal.
  • the source base station sends CHO configuration information to the terminal device.
  • the CHO configuration information includes information of one or more candidate cells, such as the global cell identifier (CGI) of the candidate cell and the CHO trigger condition corresponding to each candidate cell; or, includes the physical cell identifier (PCI) of one or more candidate cells and the frequency information corresponding to each candidate cell.
  • CGI global cell identifier
  • PCI physical cell identifier
  • the terminal device determines whether the cell quality of the candidate cell configured in the CHO configuration information meets the CHO trigger condition, takes the cell that meets the CHO trigger condition as the target switching cell, and initiates a random access channel (RACH) to the target switching cell.
  • RACH random access channel
  • the terminal device When the terminal device successfully randomly accesses the target switching cell, the terminal device sends a CHO completion message to the base station to which the target switching cell belongs (i.e., the target base station) to notify the target base station that the CHO with the target base station is completed.
  • the base station to which the target switching cell belongs i.e., the target base station
  • FIG4 is a process of performing CHO by a terminal device.
  • the terminal device communicates with the source base station, and the source base station sends RRC reconfiguration information to the terminal device, and the RRC reconfiguration information includes measurement configuration information.
  • the terminal device measures the neighboring cell according to the measurement configuration information, and reports the measurement result to the source base station in the form of a measurement report.
  • the source base station determines the cell with better signal quality among the neighboring cells according to the measurement report, and sends a CHO request to the candidate base station 1 and the candidate base station 2 to which the neighboring cell with better signal quality belongs, respectively.
  • the source base station receives the CHO request acknowledgment (conditional handover request acknowledgment, CHO request ACK) replied by the candidate base station 1 and the candidate base station 2, it is deemed that the CHO interaction between the source base station and the candidate base station 1 and the candidate base station 2 is completed.
  • the source base station sends CHO configuration information to the terminal device, and the CHO configuration information includes the candidate cell 1 to which the candidate base station 1 belongs, the candidate cell 2 to which the candidate base station 2 belongs, and the CHO trigger conditions corresponding to the candidate cell 1 and the candidate cell 2, respectively (for example, the CHO trigger condition is the signal quality threshold).
  • the terminal device determines that the signal quality between it and candidate cell 1 meets the CHO triggering condition, it initiates RACH to candidate base station 1. After the RACH is completed, the terminal device sends a CHO completion message to candidate base station 1 to notify candidate base station 1 that the CHO with candidate base station 1 is completed.
  • MR-DC a communication mode in which a terminal device communicates with multiple network devices at the same time
  • MR-DC can also be called dual-connectivity (DC).
  • the multiple network devices that communicate with the terminal device at the same time can be network devices belonging to the same radio access technology (RAT), such as the multiple network devices are all 4G base stations, or are all 5G base stations; or the multiple network devices that communicate with the terminal device at the same time can also be network devices of different RATs, such as the multiple network devices are all 5G base stations.
  • RAT radio access technology
  • Some of the network equipment in the device is 4G base stations, and the rest of the network equipment is 5G base stations.
  • the network device that interacts with the core network through control plane signaling is called a master node (MN), and other network devices are called secondary nodes (SN).
  • MN and/or SN can communicate with the core network through data plane.
  • MN can be a master base station
  • SN can be a secondary base station.
  • the network devices connected to the terminal device 1 include network device 1 and network device 2, and network device 1 is used for interacting with the core network through control plane signaling. Then, network device 1 is the MN of terminal device 1, and network device 2 is the SN of terminal device 1.
  • a terminal device can receive services from multiple cells belonging to a base station.
  • the cell group that the MN provides services for the terminal device can be called the master cell group (MCG), and the cell group that the SN provides services for the terminal device can be called the secondary cell group (SCG).
  • MCG master cell group
  • SCG secondary cell group
  • the MCG and SCG each contain at least one cell.
  • the MCG contains a primary cell (Pcell), which refers to a cell deployed at the primary frequency point and in which the terminal device initiates the initial connection establishment process or the connection reconstruction process in the cell, or indicates that it is a primary cell during the handover process.
  • Pcell primary cell
  • the SCG contains a primary secondary cell (PSCell), which refers to the cell in which the terminal device initiates the random access process in the secondary base station, or the cell in which the terminal device skips the random access process and initiates data transmission during the secondary base station change process, or the cell of the secondary base station that initiates random access during the synchronization reconfiguration process.
  • PCell and PSCell can also be called special cells (SpCell).
  • SpCell special cells
  • SCell refers to the cell operating on the secondary carrier.
  • FIG. 5 is a schematic diagram of the architecture of various cells in MR-DC.
  • the cell group serving the terminal device includes MCG and SCG.
  • MCG includes Pcell and other SCells
  • SCG includes PSCell and other SCells.
  • the SCell in the cell group performs carrier aggregation (CA) with the SpCell, that is, the terminal device uses multiple cells (carriers) for uplink and downlink communications at the same time to support high-speed data transmission.
  • CA carrier aggregation
  • the MRO mechanism means that when a terminal device encounters an abnormal situation related to mobility (such as terminal device handover failure, RLF of the terminal device in the target cell, etc.), the terminal device reports the abnormal parameters related to mobility to the network device, and the network device conducts autonomous analysis and optimizes network parameters based on the relevant abnormal parameters.
  • an abnormal situation related to mobility such as terminal device handover failure, RLF of the terminal device in the target cell, etc.
  • the network device adjusts the mobility parameters based on the feedback of the performance indicators, and the feedback of the performance indicators can be fed back through reports such as RLF report (also known as RLF report) or successful handover report (SHR).
  • the mobility parameters include parameters used in the handover judgment process, such as the signal quality threshold of the handover.
  • the MRO mechanism can reduce the problems of premature handover, late handover, and ping-pong handover in the same-frequency handover, different-frequency handover, different-system handover, etc. caused by unreasonable network parameter settings.
  • the reporting mechanism of RLF report and SHR is usually delayed, that is, the terminal device records the RLF report and SHR.
  • the terminal device accesses the network device, the terminal device sends an indication message to the network device to indicate the existence of the RLF report or SHR.
  • the network device sends a terminal device information request (UE Information Request) message to the terminal device information to request the terminal device to report the RLF report or SHR; the terminal device sends the RLF report or SHR to the network device through a terminal device information response (UE Information Response) message, and then the network device identifies the mobility process problems and optimizes the mobility parameters according to the RLF report and SHR.
  • UE Information Request terminal device information request
  • UE Information Response terminal device information response
  • the terminal device will record an RLF report in the following two situations: Situation 1: The terminal device did not receive the switching message or received the CHO configuration but it was not triggered, and RLF occurred; Situation 2: The terminal device received the switching message, or received the dual active protocol stack (DAPS) switching message, or received the CHO configuration and triggered the connection to the target cell, but failed to access the target cell or RLF occurred soon after accessing the target cell.
  • Situation 1 The terminal device did not receive the switching message or received the CHO configuration but it was not triggered, and RLF occurred
  • Situation 2 The terminal device received the switching message, or received the dual active protocol stack (DAPS) switching message, or received the CHO configuration and triggered the connection to the target cell, but failed to access the target cell or RLF occurred soon after accessing the target cell.
  • DAPS dual active protocol stack
  • the RLF report includes but is not limited to one or more of the following information:
  • failedPcellID includes the primary cell where the terminal device detects RLF, and is used to indicate the cell information of the primary cell, or the target cell information of handover failure (HOF).
  • connectionFailureType includes RLF of the terminal device, handover failure of the terminal device, or expiration of a timer started by the terminal device (such as the T312 timer started after sending a measurement report).
  • Source primary cell identifier (previous PCell ID).
  • the previous PCell ID includes the source cell information where the terminal device received the handover command for the last time.
  • ReestablishmentCellId includes the cell information for initiating RRC connection reestablishment (hereinafter referred to as RRC reestablishment) after the terminal device fails to connect.
  • timeConnFailure includes the time from the last time the terminal device received the HO command to the time the connection failed.
  • timeSinceFailure includes the length of time from the time the terminal device connection fails to start recording. Generally refers to the time from when the terminal device fails to connect to when it reports the RLF report.
  • RLF Cause includes the reason why the terminal device has RLF, or the reason for the handover failure.
  • rlf-Cause is T310 timer timeout, or random access problem (randomAccessProblem), or beam failure recovery failure (beamFailureRecoveryFailure), or Listen Before Talk failure (LBT failure), or too many RLC retransmissions, etc.
  • Last handover type (last HO-Type).
  • the last HO-Type is used to indicate whether the last handover performed by the terminal device was CHO or dual active protocol handover (DAPS).
  • timeSinceCHO-Reconfig includes the time from the last receipt of the CHO command to the CHO handover failure or RLF.
  • TimeConnSourceDAPS-Failure includes the time of the last DAPS handover to the source cell RLF.
  • Conditional handover cell identifier (CHOCellId).
  • the CHO candidate cell for the terminal device to perform CHO based recovery (CHO based recovery).
  • serving cell measurement result (measResultLastServCell): Based on the PCell collected when the UE detects RLF or the synchronization signal block (SSB) and channel state information reference signal (CSI-RS) measurement results available in the source PCell when the handover fails, including one or more of RSRP, RSRQ and SINR.
  • measResultLastServCell Based on the PCell collected when the UE detects RLF or the synchronization signal block (SSB) and channel state information reference signal (CSI-RS) measurement results available in the source PCell when the handover fails, including one or more of RSRP, RSRQ and SINR.
  • SSB synchronization signal block
  • CSI-RS channel state information reference signal
  • Neighboring cell measurement results (measResultNeighCells): Based on the SSB and CSI-RS measurement results of the cells available for measurement except the serving cell in 7) RLF collected when the UE detects the failure, including one or more of reference signal receiving power (RSRP), reference signal receiving quality (RSRQ) and signal to interference plus noise ratio (SINR). Including the indication information and triggering conditions of the CHO candidate cells;
  • RSRP reference signal receiving power
  • RSRQ reference signal receiving quality
  • SINR signal to interference plus noise ratio
  • CHOCandidateCellList includes other CHO candidate cells besides the CHO candidate cells in the neighboring cell measurement;
  • Random access information (RA-InformationCommon).
  • RA-InformationCommon includes HOF, or, when RLF is caused by random access problems or beam failure recovery failure, records random access-related information, including random access cell identification information, random access frequency information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempts, two-step random access data volume to be transmitted, and one or more of the two-step random access PUSCH configuration information.
  • the cell identification information involved above may include CGI, and/or PCI and frequency.
  • the RLF report may also include the cell quality of each cell, such as the cell quality of the failed cell and/or the neighboring cell when RLF is detected.
  • the cell identification information may also include the measurement result of the cell.
  • the terminal device When a terminal device experiences a connection failure (or link failure), the terminal device will record an RLF report; when the terminal device fails to connect again, the terminal device will clear the previously recorded RLF report and record the latest RLF report.
  • the terminal device In order to identify potential mobility failure problems in a scenario where mobility is successful, the terminal device is introduced to record and report parameters in the successful switching process to the network, that is, the terminal device reports SHR to the source base station.
  • the SHR is used to record mobility-related information in a successful switching scenario with potential failure problems.
  • the source base station can combine the SHR information and the terminal device context to optimize the mobility parameters of the terminal device.
  • the source base station receives a terminal device context release (i.e., UE context release) message from the target base station to release the context of the terminal device.
  • a terminal device context release i.e., UE context release
  • the terminal device context generally refers to the link established between the terminal device and the network device, and the specific content includes the authentication information of the terminal device, the network capability of the terminal device, etc.
  • the terminal device sends an SHR to the target base station, and the target base station forwards the SHR to the source base station.
  • the source base station can configure the terminal device to record the SHR trigger condition (also known as SHR trigger condition) by sending an RRC reconfiguration (also known as RRC Reconfiguration) message to the terminal device.
  • the terminal device records the SHR only when the SHR trigger condition is met.
  • the SHR trigger condition includes but is not limited to: 1. Timer (timer) timeout (for example, the timing result of the three timers T304/T310/T312 reaches a specific threshold); 2. RLF occurs in the source cell during the DAPS handover.
  • T304 timer T310 timer
  • T312 timer T312 timer
  • the terminal device starts the T304 timer when receiving the RRC reconfiguration message.
  • the running time of the T304 timer is used to indicate the terminal device The duration from receiving the RRC reconfiguration message to successfully completing random access to the target network device.
  • the terminal device determines that a switching failure has occurred; when the running time of the T304 timer is less than threshold 1, but greater than or equal to threshold 2, the terminal device considers that there is a potential switching failure and triggers an SHR record.
  • the value of threshold 1 is greater than the value of threshold 2.
  • the terminal device When the terminal device performs radio link detection, when the number of consecutive downlink out-of-synchronization indications (out of sync) received is equal to N310, the T310 timer is started; when the terminal device receives consecutive downlink synchronization indications (in of synchronization, in sync) equal to N311, the T310 timing is stopped. When the T310 timer times out, the terminal device determines that RLF is detected and triggers the RRC connection reestablishment process.
  • N310 is the maximum number of consecutive downlink out of sync required to start the T310 timer
  • N311 is the maximum number of consecutive downlink in sync required to stop the T310 timer.
  • the terminal device starts the T310 timer when it detects a physical layer desynchronization problem with the source network device. During the operation of the T310 timer, if the wireless link is restored, the T310 timer stops.
  • the running length of the T310 timer is used to indicate the duration between the time when the terminal device detects a physical layer desynchronization problem with the source network device and the time when the terminal device detects the recovery of the wireless link.
  • the running length of the T310 timer is greater than or equal to threshold 3
  • the terminal device determines that RLF has occurred; when the running length of the T310 timer is less than threshold 3, but greater than or equal to threshold 4, the terminal device will consider that there is a potential possibility of RLF and will trigger an SHR record.
  • the value of threshold 3 is greater than the value of threshold 4.
  • the T312 timer is started; when the terminal device detects N312 consecutive synchronization indications from L1, the T312 timer is stopped. Once the T312 timer corresponding to the MCG times out, the terminal device is triggered to perform RRC reconstruction; once the T312 timer corresponding to the SCG times out, the terminal device sends the secondary cell group failure information (i.e., SCG failure information) to the SN.
  • the secondary cell group failure information i.e., SCG failure information
  • the T312 timer is started when the terminal device triggers a measurement report, and the T312 timer is stopped when the terminal device detects that the radio link has been restored.
  • the running duration of the T312 timer indicates the duration between the triggering of the measurement report by the terminal device and the restoration of the radio link between the terminal device and the source network device during the operation of the T310 timer.
  • the terminal device When the running duration of the T312 timer is greater than or equal to the threshold value 5, the T312 timer times out, and the terminal device determines that an RLF has occurred; when the running duration of the T312 timer is less than the threshold value 5, but greater than or equal to the threshold value 6, the terminal device considers that there is a potential for an RLF to occur, and will trigger an SHR record.
  • the value of threshold 5 is greater than the value of threshold 6.
  • the SHR recorded due to the triggering of the T304 timer usually points to a potential failure in the terminal device's access to the target cell, such as too early Handover;
  • the SHR recorded due to the RLF triggering of the T310/T312 timer or the DAPS handover in the source cell usually points to a potential failure between the UE and the source cell, such as too late Handover.
  • the source MN and SN interact to support the fast MCG link recovery process.
  • the source MN sends a request message to the SN, which is used to request the SN to support the fast MCG link recovery process through split signaling radio bearer (SRB) 1 or SRB3.
  • the SN sends a response message to the source MN, which is used to support the fast MCG link recovery process through split SRB1 or SRB3.
  • the fast MCG link recovery process refers to the signaling interaction between the UE and the SN for fast MCG link recovery through SRB3 or split SRB1 after MCG RLF occurs between the terminal device and the source MN.
  • the source MN configures the fast MCG link recovery process to the terminal device.
  • the source MN sends the configuration information for fast MCG link recovery to the terminal device through the RRC reconfiguration message, so that after MCG RLF occurs between the terminal device and the source MN, the terminal device can perform the fast MCG link recovery process by exchanging information with the SN.
  • the configuration message includes configuring the terminal device to use split SRB1 or SRB3 when performing MCG fast recovery, and configuring the first timer (e.g., T316 timer).
  • the first timer (e.g., T316 timer) starts when the terminal device sends the MCG failure information to the SN (i.e., executes S604), and stops when the terminal device receives the first message from the source MN through the SN (i.e., executes S605) during the timer running, otherwise it will stop until the timer expires.
  • the running time of the first timer (e.g., T316 timer) is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message.
  • the terminal device detects that MCG RLF occurs between it and the source MN, and includes the RLF information in the RLF report.
  • the terminal device When the terminal device detects that RLF occurs between the terminal device and the MCG, the terminal device records the RLF report, wherein the content of the RLF report can refer to the aforementioned description of the RLF report.
  • the terminal device sends the master cell group failure information (MCG failure information) to the SN and starts the first timer (for example, T316 timer).
  • the SN forwards the MCG failure information to the source MN.
  • the terminal device When the transmission between the terminal device and the SCG is available, the terminal device sends MCG failure information to the SN and starts the first timer (e.g., T316 timer).
  • the transmission between the terminal device and the SCG is available, including: the transmission of the SCG is not suspended, the connection between the terminal device and the SCG is not disconnected, the SCG is not deactivated, and no PScell change/addition is in progress.
  • the terminal device performs RRC reconstruction.
  • the MCG failure information includes MCG available measurement results (i.e., available results measured by the terminal device when the measurement frequency is configured for the terminal device through SCG RRC signaling, including the measurement result of PCell in MCG and the measurement result of the neighboring area of the PCell), SCG available measurement results (i.e., available results measured by the terminal device when the measurement frequency is configured for the terminal device through SCG RRC signaling, including the measurement result of PSCell in SCG and the measurement result of the neighboring area of the PSCell), MCG link failure type (for example, T310 timer timeout, T312 timer timeout, random Access Problem, beam Failure Recovery Failure, LBT failure, too many RLC retransmission failures, etc.).
  • MCG available measurement results i.e., available results measured by the terminal device when the measurement frequency is configured for the terminal device through SCG RRC signaling, including the measurement result of PCell in MCG and the measurement result of the neighboring area of the PCell
  • SCG available measurement results i.e., available
  • the terminal device Before the first timer times out, the terminal device receives a first message (a handover message or an RRC release message) from the source MN through the SN. Correspondingly, the source MN sends the first message to the SN, and the SN forwards the first message to the terminal device.
  • a first message a handover message or an RRC release message
  • the first timer is configured with a timeout threshold value, and when the timing result of the first timer reaches the timeout threshold, the first timer stops timing. If the terminal device receives the first message from the source MN through the SN before the first timer times out (or understood as during the operation of the first timer), it indicates that the terminal device successfully executes fast MCG link recovery, and the terminal device clears the RLF report recorded in S603. If the terminal device does not receive the first message from the source MN through the SN before the first timer times out, the terminal device fails to execute fast MCG link recovery, the terminal device saves the RLF report recorded in S603, and the terminal device performs RRC reconstruction and performs cell reselection.
  • the handover message is the handover command sent by the source MN to the terminal device after the source MN selects a suitable cell to initiate a handover request and the target MN responds to the handover request.
  • the terminal device then performs handover and data forwarding based on the handover command.
  • the RRC release message is the RRC connection release information sent by the source MN to the terminal device. After receiving the RRC release message, the terminal device performs cell reselection. After confirming that there is a new cell that meets the cell reselection conditions, the terminal device attempts to reside in the new cell.
  • the source MN before S603 is executed, sends a CHO request to the candidate MN to request that the terminal device can perform CHO on the candidate MN. After the source MN receives the confirmation message sent by the candidate MN, it indicates that the terminal device can subsequently perform CHO on the candidate MN. Furthermore, the source MN configures CHO configuration information to the terminal device through an RRC reconfiguration message, and the CHO configuration information includes the candidate cell wireless air interface configuration and the CHO execution trigger condition corresponding to the candidate cell.
  • the terminal device when the terminal device receives the CHO message in S605, the terminal device continuously evaluates whether there is a candidate MN that meets the CHO execution trigger condition until the terminal device detects that a candidate target cell meets the corresponding switching execution trigger condition, executes CHO, performs random access to the target base station and establishes an RRC connection, and at the same time removes the connection with the source base station.
  • the terminal device when the terminal device is configured with CHO but CHO is not triggered, the terminal device detects the MCG RLF of S603.
  • the terminal device performs switching or enters the idle state according to the first message, re-establishes the MCG RRC connection, and restores the MCG link of the terminal device.
  • the terminal device performs handover according to the handover target cell indicated by the first message, performs random access to the target cell and establishes an RRC connection. If the first message is an RRC release message, the terminal device enters an idle state to select a cell, and if a suitable cell is selected, performs RRC connection establishment.
  • the terminal device is close to RLF with the SCG (for example, the number of random access messages sent by the terminal device to the auxiliary node is close to the threshold value. If the threshold value is exceeded, the terminal device fails to randomly access the auxiliary node), or the time from the terminal device sending the MCG failure information to receiving the first message is too long (close to the timeout threshold value of the first timer, that is, the first timer is close to timeout), etc.
  • the terminal device is close to RLF with the SCG (for example, the number of random access messages sent by the terminal device to the auxiliary node is close to the threshold value. If the threshold value is exceeded, the terminal device fails to randomly access the auxiliary node), or the time from the terminal device sending the MCG failure information to receiving the first message is too long (close to the timeout threshold value of the first timer, that is, the first timer is close to timeout), etc.
  • FIG. 7 takes the MN, SN and terminal device connected by the terminal device as the execution subject as an example for explanation. It can be understood that the execution subject of the communication method can also be the chip in the MN, the chip in the SN and the chip in the terminal device. Among them:
  • the terminal device sends MCG failure information to the MN via the SN.
  • the MN receives MCG failure information from the terminal device via the SN.
  • the content of the MCG failure information mentioned in S701 please refer to the relevant description of MCG failure information in the aforementioned S604; the content of the MCG failure information can also refer to the relevant description of MCG failure information in the subsequent S801.
  • the terminal device receives a first message from the MN through the SN.
  • the MN sends a first message to the terminal device through the SN.
  • the first message includes a handover message or an RRC release message.
  • the first time can be understood as the running time of the first timer within the timeout threshold of the first timer.
  • the first timer can be a T316 timer.
  • the terminal device When the triggering condition is met, the terminal device records a first report, which is used to indicate relevant information in the process of executing fast MCG link recovery.
  • the terminal device determines whether the trigger condition is met. If the trigger condition is met, the terminal device records the first report; otherwise, when the trigger condition is not met or fast MCG link recovery fails, the terminal device does not record the first report.
  • the first report can be an SHR or other types of reports, which is not limited in this application.
  • the first report includes one or more of the following information: (1) the running time of the first timer. (2) identification information of the primary and secondary cells. (3) trigger condition indication information of the first report, which is used to indicate the trigger reason for triggering the first report to be recorded this time (i.e., the trigger condition satisfied by the first report to be recorded this time).
  • the trigger condition reason value corresponding to the trigger condition indicates whether the trigger condition is satisfied.
  • the trigger condition satisfied by the first report to be recorded this time includes the trigger condition; when the trigger condition reason value corresponding to the trigger condition is indicated as False, the trigger condition satisfied by the first report to be recorded this time does not include the trigger condition.
  • SCG measurement information measurement information measured by the terminal device according to the measurement configuration configured by the SN (including configuration of measurement frequency, etc.), including the measurement results of the PSCell in the SCG and the measurement results of the neighboring cells of the PSCell.
  • Information on the random access of the terminal device to the SN If the number of transmissions of Msg1 and/or MsgA during the random access of the terminal device to the SN (or SCG) is too many, that is, the number of transmissions of Msg1 and/or MsgA during the random access of the terminal device to the SN is greater than the preset number, it is determined that the RLF is close to occurring between the terminal device and the SCG (that is, there is a potential SCG RLF).
  • the first report is triggered and recorded, and the first report includes the information on the random access of the terminal device to the SN.
  • the information on the random access of the terminal device to the SN includes one or more of the following items: random access cell identification information, random access frequency information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, two-step random access data amount to be transmitted, and two-step random access PUSCH configuration information.
  • the terminal device can indicate, through the first report, SN-related information during the execution of the fast MCG link recovery process (including one or more items of measurement result information measured by the terminal device according to the configuration of the SN for the terminal device and information of random access to the SN), and/or the duration information of executing the fast MCG link recovery process.
  • the terminal device may receive a configuration message from the MN, where the configuration message is used to configure the terminal device to record a first report when fast MCG link recovery is successful and a trigger condition is met.
  • the configuration message includes the trigger condition for recording the first report.
  • the MN configures the trigger condition for triggering the recording of the first report to the terminal device through a configuration message, and a terminal device that has not received the configuration message from the MN will not record the first report, thereby improving the flexibility of the terminal device in recording the first report.
  • the configuration message may be the same message as the RRC reconfiguration message for configuring the fast recovery process in S602, or may be another RRC reconfiguration message other than the RRC reconfiguration message for configuring the fast recovery process in S602.
  • the triggering conditions are described in detail below.
  • the triggering conditions may include one or more of the following items:
  • Trigger condition 1 The running time of the first timer is less than the first threshold value and greater than or equal to the second threshold value.
  • the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message.
  • the first threshold value is the timeout threshold value of the first timer.
  • the first threshold value is the timeout threshold value of the first timer.
  • the first timer times out and fast MCG link recovery fails; when the running time of the first timer is less than the first threshold value, but greater than or equal to the second threshold value, the terminal device will consider that there is a potential for fast MCG link recovery failure and trigger the recording of the first report.
  • the second threshold value is a value less than the first threshold value; or the second threshold value is the product of the first threshold value and the first coefficient, and the first coefficient is a positive number less than 1, for example, the first coefficient is a percentage coefficient, which is used to indicate the proportion of the second threshold value to the first timer timeout threshold value.
  • Trigger condition 2 The terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the second timer corresponding to the SN is less than the third threshold value and greater than or equal to the fourth threshold value; the running time of the second timer is: the time from when the terminal device detects that there is a physical layer desynchronization problem with the SN to when the terminal device detects that the wireless link between the terminal device and the SN is restored.
  • the second timer can be the aforementioned T310 timer.
  • the third threshold value is the timeout threshold value of the second timer.
  • the running time of the second timer reaches the third threshold value, the second timer times out, and RLF is close to occurring between the terminal device and the SN.
  • the terminal device cannot perform signaling interaction with the MN through the SN, which in turn leads to the failure of fast MCG link recovery.
  • the running time of the second timer is less than the third threshold value, but greater than or equal to the fourth threshold value, the terminal device will consider that there is a potential possibility of RLF between the terminal device and the SN, triggering the recording of the first report.
  • the fourth threshold value is a value less than the third threshold value; or, the fourth threshold value is the product of the third threshold value and the second coefficient, and the second coefficient is a positive number less than 1, for example, the second coefficient is a percentage coefficient, which is used to indicate the proportion of the fourth threshold value to the timeout threshold value of the second timer.
  • Trigger condition three the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the third timer corresponding to the SN is less than the fifth threshold value and greater than or equal to the sixth threshold value, and the running time of the third timer is: the time between the terminal device triggering the measurement report and the terminal device detecting the recovery of the radio link with the SN during the operation of the second timer.
  • the third timer can be the aforementioned T312 timer.
  • the fifth threshold value is the timeout threshold value of the third timer.
  • the third timer times out, and RLF occurs between the terminal device and the SN, which leads to the failure of fast MCG link recovery.
  • the terminal device will consider that there is a potential possibility of RLF between the terminal device and the SN, triggering the recording of the first report.
  • the sixth threshold value is a value less than the fifth threshold value; or, the sixth threshold value is the product of the fifth threshold value and the third coefficient, and the third coefficient is a positive number less than 1, for example, the third coefficient is a percentage coefficient, which is used to indicate the proportion of the sixth threshold to the timeout threshold value of the third timer.
  • Trigger condition four the terminal device detects that RLF occurs between the terminal device and the MN, and the number of random access message transmissions between the terminal device and the SN is less than the seventh threshold value and greater than or equal to the eighth threshold value.
  • the terminal device when the number of transmissions of random access messages (such as Msg1 and/or MsgA) between the terminal device and the SN reaches the seventh threshold value, the terminal device fails to randomly access the SN, which leads to the failure of fast MCG link recovery; when the number of transmissions of random access messages between the terminal device and the SN is less than the seventh threshold value, but greater than or equal to the eighth threshold value, the terminal device believes that there is a potential for RLF between the terminal device and the SN, triggering the recording of the first report.
  • Msg1 and/or MsgA random access messages
  • the eighth threshold value is less than the seventh threshold value; or, the eighth threshold value is the product of the seventh threshold value and the fourth coefficient, and the fourth coefficient is a positive number less than 1, for example, the third coefficient is a percentage coefficient, which is used to indicate the proportion of the eighth threshold value to the seventh threshold value.
  • Trigger condition five the terminal device detects that RLF occurs between the terminal device and the MN, and the terminal device detects indication information from the RLC layer of the SN, where the indication information is used to indicate that the number of repeated transmissions occurring at the RLC layer is less than the ninth threshold value and greater than or equal to the tenth threshold value.
  • the indication information of the RLC layer indicates that the number of repeated transmissions occurring at the RLC layer reaches the ninth threshold value, it is determined that RLF occurs between the terminal device and the SN; when the indication information of the RLC layer indicates that the number of repeated transmissions occurring at the RLC layer is less than the ninth threshold value, but greater than or equal to the tenth threshold value, the terminal device believes that there is a potential possibility of RLF between the terminal device and the SN, and triggers the recording of the first report.
  • the tenth threshold value is less than the ninth threshold value; or, the tenth threshold value is the product of the ninth threshold value and the fifth coefficient, and the fifth coefficient is a positive number less than 1, for example, the fifth coefficient is a percentage coefficient, which is used to indicate the proportion of the tenth threshold value to the ninth threshold value.
  • Trigger condition six the terminal device detects that RLF occurs between it and the MN, and the number of consecutive failures of executing LBT on the SN is less than the eleventh threshold value and greater than or equal to the twelfth threshold value.
  • the twelfth threshold value is less than the eleventh threshold value or the twelfth threshold value is the product of the eleventh threshold value and the sixth coefficient, and the sixth coefficient is a positive number less than 1, for example, the sixth coefficient is a percentage coefficient, which is used to indicate the proportion of the twelfth threshold value to the eleventh threshold value.
  • threshold values mentioned in this application are predefined values on the network side and can be adjusted accordingly according to specific application scenarios. This application does not make specific limitations on this.
  • the first report also includes one or more of the following information: the running time of the second timer, the running time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring at the SN radio link control layer, and the number of consecutive failures of performing LBT on the SN. That is, when the triggering condition for triggering the first report of this recording is the aforementioned triggering condition, When any one of conditions 1 to 6 is met, the first report may also include relevant information of the triggering condition for recording the first report. For example, when the triggering condition for recording the first report is triggering condition 2, the first report may include one or more of information (1) to (4) in S703, and may also include the running time of the second timer.
  • the terminal device sends a first report to the MN and/or the SN.
  • the MN and/or the SN receives the first report from the terminal device.
  • the terminal device communicates with the first network device (i.e., MN) and the second network device (i.e., SN) at the same time.
  • the terminal device executes the fast MCG link recovery process.
  • the terminal device accesses the third network device through switching or cell selection, that is, the third network device is the MN currently connected to the terminal device (or it is understood that the third network device is the target MN and the first network device is the source MN).
  • the terminal device sends the first report to the third network device; or indicates the existence of the first report to the third network device in the RRC completion message.
  • the terminal device After the terminal device receives the report request for the first report of the third network device, the terminal device sends the first report to the third network device. Further, the third network device performs a preliminary analysis and sends the first report to the MN and/or SN. Among them, the third network device determines to send to the MN and/or SN according to the trigger cause indication information of the first report. When the trigger condition one is met, the third network device forwards the report to the MN, and when one or more of the trigger conditions two to six are met, the third network device forwards the report to the SN. Furthermore, after receiving the first report, the MN or SN may adjust the mobility parameter configuration information of the terminal device according to the first report.
  • the first report indicates that the trigger condition for triggering the record of the first report is the aforementioned trigger condition 2.
  • the SN optimizes the configuration information of the terminal device connecting to the SN, thereby reducing the probability of RLF occurring between the terminal device and the SN, thereby increasing the chance of success of the fast MCG link recovery process and reducing the delay of MCG transmission recovery.
  • the third network device can be the MN (that is, the cell connected after the terminal device executes fast MCG link recovery is a cell at the same site as the source MCG) or other network devices other than the MN (that is, the cell connected after the terminal device executes fast MCG link recovery is a cell at a different site from the source MCG).
  • this application uses the third network device as an example of a network device other than the MN, which should not be regarded as a specific limitation on the present application.
  • the first report can be transmitted between the CU node and the DU node, or between network devices, or between the network device and the core network device, which is not limited in the present application.
  • the third network device if the third network device is in a separate form including a CU node and a DU node, then the CU node in the third network device can 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 third network device may send the first report to other network devices that need the first report. For example, in the following steps, the third network device may send the first report to the first network device (i.e., the aforementioned MN) or the second network device (i.e., the aforementioned SN).
  • the third network device may send part or all of the information included in the first report to the second network device.
  • the third network device can send part or all of the information of the first report to the second network device through the interface between the base station and the base station (such as the X2 interface or the Xn interface).
  • the third network device can send part or all of the information of the first report to the second network device through an indication message (such as a failure indication message or an RLF indication message), a handover report message or other messages.
  • the third network device may send part or all of the information of the first report to the second network device through the core network device.
  • part or all of the information of the first report is sent to the core network device through the interface between the base station and the core network device (such as the S1 or NG interface), and the core network device forwards the information received from the third network device to the second network device.
  • the third network device may send part or all of the information of the first report to the second network device through the following messages on the S1 or NG interface: uplink RAN configuration transfer message, downlink RAN configuration transfer message, base station configuration transfer (eNB configuration transfer) message, core network equipment configuration transfer (MME configuration transfer) message or other messages.
  • eNB configuration transfer base station configuration transfer
  • MME configuration transfer core network equipment configuration transfer
  • the third network device sending part or all of the information of the first report to the first network device may also refer to the manner in which the third network device sends the first report to the first network device, which will not be described here.
  • the third network device may also send type information of the first report to the second network device or the first network device, for example, the third network device sends indication information to the second network device or the first network device, and the indication information is used to indicate that the type of the first report is SHR, or the indication information is used to indicate that the type of the first report is a report of fast MCG link recovery success.
  • the terminal device when the terminal device performs fast MCG link recovery successfully and meets the triggering conditions, the terminal device reports to the network device (including MN and/or SN) the relevant information used to indicate the fast MCG link recovery process, so that the network device analyzes the potential causes that may cause the fast MCG link recovery process to fail, and generates a triggering condition based on the analysis.
  • the configuration information of fast MCG link recovery of the terminal device or other terminal devices is optimized, thereby reducing the probability of RLF between the terminal device and the SN, thereby improving the chance of success of the fast MCG link recovery process and reducing the delay of MCG transmission recovery.
  • FIG. 8a is a flow chart of another communication method provided by an embodiment of the present application.
  • FIG. 8a takes the MN connected to the terminal device and the terminal device as the execution subject as an example for explanation. It can be understood that the execution subject of the communication method can also be the chip in the MN and the chip in the terminal device. Among them:
  • the terminal device When RLF occurs between the terminal device and MN, the terminal device sends MCG failure information to MN through SN and records the RLF report.
  • the primary cell failure information in S801 includes not only the MCG failure information in S603, but also one or more of the following information: (1) information about the first cell (i.e. the failed Pcell ID), where the first cell is the primary cell where the terminal device detects that RLF has occurred; (2) information about the second cell (i.e. the previous PCell ID), where the second cell is the source primary cell of the last switching command received by the terminal device; (3) RLF cause indication information (i.e.
  • the rlf-cause (4) first time information, where the first time information is used to indicate the duration between the moment when the terminal device receives the last switching command and the moment when RLF occurs; (5) second time information (i.e. the time Since CHO-Reconfig), where the second time information is used to indicate the duration between the moment when the terminal device receives the last CHO and the moment when RLF occurs; (6) information about the random access MN by the terminal device (ra-Information Com mon), it can be understood that if the cause of MCG RLF is the random access problem of the PCell cell corresponding to the failed Pcell ID or the failure of beam failure recovery, then the main cell failure information in S801 includes the information of the terminal device randomly accessing the MN; the information of the terminal device randomly accessing the MN includes one or more of the following items: random access cell identification information, random access frequency information, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, two-step random access data volume
  • the terminal device receives the first message from the MN through the SN and releases the RLF report.
  • the terminal device receives the first message from the MN through the SN within the first time (that is, before the T316 timer expires), the fast MCG link recovery is successful, and the terminal device releases (or is understood to delete) the RLF report.
  • the terminal device does not receive the first message from the MN through the SN within the first time, the fast MCG link recovery fails, the terminal device performs RRC reconstruction, and after the RRC reconstruction is completed, the terminal device sends the RLF report to the MN through the connected network device.
  • S802 can refer to the above description of the specific implementation of S605 to S606, which will not be repeated here.
  • MCG failure information is an immediate reporting mechanism (i.e., after MCG RLF occurs, the terminal device immediately sends MCG failure information to the SN). Therefore, through the communication method shown in FIG8a, after the terminal device detects MCG RLF and successfully executes fast MCG link recovery, it can indicate the MCG RLF failure scenario-related information to the MN through enhanced MCG failure information (MCG failure information containing RLF report content), so that regardless of whether the fast MCG link recovery process is successfully executed or not and whether the terminal device releases the RLF report, the MN can perform MRO according to the enhanced MCG failure information.
  • MCG failure information containing RLF report content
  • the communication method shown in FIG. 8a may be implemented in combination with the communication method shown in FIG. 7, that is, the content of the MCG failure information of S701 in FIG. 7 includes the content of the MCG failure information described in S801 in FIG. 8a.
  • the implementation process of the communication method of FIG. 7 and FIG. 8a is combined please refer to the flow chart of the communication method shown in FIG. 8b, as shown in FIG. 7, FIG. 7 takes the MN, SN and terminal device connected by the terminal device as the execution subjects as an example for explanation. It can be understood that the execution subject of the communication method may also be the chip in the MN, the chip in the SN and the chip in the terminal device. Among them:
  • S8001 may refer to the specific implementation of S701 or S801 mentioned above, and the description of the MCG failure information may refer to the description of the MCG failure information in S801.
  • MN sends a first message to SN.
  • the terminal device When the triggering condition is met, the terminal device records a first report, which is used to indicate relevant information in the process of executing fast MCG link recovery.
  • S8005 may refer to the description of the specific implementation of S703 mentioned above.
  • the terminal device sends a first report to the third network device.
  • the third network device sends a first report to the MN and/or the SN.
  • the terminal device, MN and SN may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • an embodiment of the present application provides a communication device 900.
  • the communication device 900 may be a component of a terminal device (e.g., an integrated circuit, a chip, etc.), a component of a MN (e.g., an integrated circuit, a chip, etc.), or a component of a SN (e.g., an integrated circuit, a chip, etc.).
  • the communication device 900 may also be other communication units for implementing the method in the method embodiment of the present application.
  • the communication device 900 may include: a communication unit 901, a processing unit 902, and a storage unit 903.
  • one or more units in FIG. 9 may be implemented by one or more processors, or by one or more processors and memories; or by one or more processors and transceivers; or by one or more processors, memories, and transceivers, which are not limited in the embodiments of the present application.
  • the processors, memories, and transceivers may be provided separately or integrated.
  • the communication device 900 has the functions of implementing the terminal device or MN or SN described in the embodiments of the present application.
  • the communication device 900 includes a module or unit or means corresponding to the steps involved in the terminal device or MN or SN described in the embodiments of the present application at the transmitting end, and the functions or units or means can be implemented by software, or by hardware, or by hardware executing corresponding software implementations, or by a combination of software and hardware.
  • the functions or units or means can be implemented by software, or by hardware, or by hardware executing corresponding software implementations, or by a combination of software and hardware.
  • a communication device 900 may include: a storage unit 903 and a communication unit 901;
  • the communication unit 901 is used to send MCG failure information to the MN through the SN when RLF occurs between the terminal device and the MN; wherein the MCG failure information is used to request the execution of fast MCG link recovery; within the first time after the moment of sending the MCG failure information, the communication unit 901 is also used to receive a first message from the MN through the SN; wherein the first message includes a switching message or an RRC release message; when the triggering condition is met, the storage unit 903 is used to record a first report; wherein the first report is used to indicate relevant information in the process of executing fast MCG link recovery; further, the communication unit 901 is also used to send the first report to the MN.
  • the communication unit 901 is also used to receive a configuration message from the MN, where the configuration message is used to configure recording of the first report when fast MCG link recovery is successful and a trigger condition is met; wherein the configuration message includes the trigger condition.
  • the first report includes one or more of the following information: the running time of the first timer, identification information of the primary and secondary cells, trigger condition indication information of the first report, measurement information of the SCG, and information of the terminal device randomly accessing the SN; wherein, the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message.
  • the information of the terminal device's random access SN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempts, the amount of data to be transmitted for two-step random access, and one or more of the PUSCH configuration information for two-step random access.
  • the triggering condition includes one or more of the following items:
  • the running time of the first timer is less than the first threshold value and greater than or equal to the second threshold value, and the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message; wherein the second threshold value is the product of the first threshold value and the first coefficient, and the first coefficient is a positive number less than 1; or, the second threshold value is a value less than the first threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the second timer corresponding to the SN is less than the third threshold value and greater than or equal to the fourth threshold value;
  • the running time of the second timer is: the time from when the terminal device detects that there is a physical layer desynchronization problem with the SN to when the terminal device detects that the radio link between the terminal device and the SN is restored; wherein the fourth threshold value is the product of the third threshold value and the second coefficient, and the second coefficient is a positive number less than 1; or, the fourth threshold value is a value less than the third threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the third timer corresponding to the SN is less than the fifth threshold value and greater than or equal to the sixth threshold value, and the running time of the third timer is: the time between the terminal device triggering the measurement report during the operation of the second timer and the terminal device detecting the recovery of the radio link between the terminal device and the SN; wherein the sixth threshold value is the product of the fifth threshold value and the third coefficient, and the third coefficient is a positive number less than 1; or, the sixth threshold value is a value less than the fifth threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the number of random access message transmissions between the terminal device and the SN is less than the seventh threshold value and greater than or equal to the eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and the fourth coefficient, and the fourth coefficient is a positive number less than 1; or, the eighth threshold value is less than the seventh threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the terminal device detects indication information from the radio link control layer of the SN, where the indication information is used to indicate that the number of repeated transmissions occurring in the radio link control layer is less than the ninth threshold value and greater than or equal to the tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and the fifth coefficient, and the fifth coefficient is a positive number less than 1; or, the tenth threshold value is less than the ninth threshold value;
  • the terminal device detects that RLF occurs between it and the MN, and the number of consecutive failures of executing uplink LBT on the SN is less than the eleventh threshold value and greater than or equal to the twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and the sixth coefficient, and the sixth coefficient is a positive number less than 1; or, the twelfth threshold value is less than the eleventh threshold value.
  • the first report also includes one or more of the following information: the running time of the second timer, the running time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring in the SN wireless link control layer, and the number of consecutive failures of performing LBT on the SN.
  • the storage unit 903 when RLF occurs between the terminal device and the MN, the storage unit 903 is also used to record the RLF report; if the communication unit 901 is also used to receive a first message from the MN through the SN within the first time after the moment of sending the MCG failure information, the storage unit 903 is also used to release the RLF report.
  • MCG failure information includes one or more of the following information: information of a first cell, where the first cell is a primary cell in which the terminal device detects that RLF has occurred; information of a second cell, where the second cell is a source primary cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, where the first time information is used to indicate the duration between the moment when the terminal device received the last switching command and the moment of RLF; second time information, where the second time information is used to indicate the duration between the moment when the terminal device received the last CHO command and the moment of RLF; information of a random access MN by the terminal device; first indication information, where the first indication information is used to indicate that the MN measured by the terminal device as of the time of RLF is the first candidate cell of the CHO configured for the terminal device; and/or, a switching trigger condition for the first candidate cell; and second indication information, where the second indication information is used to indicate a second candidate cell measured by the terminal device other than the first
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • a communication device 900 may include: a communication unit 901;
  • the communication unit 901 is used to receive MCG failure information from the terminal device through the SN; wherein the MCG failure information is used to request to perform fast MCG link recovery;
  • the communication unit 901 is further configured to send a first message to the terminal device through the SN; wherein the first message includes a handover message or an RRC release message;
  • the communication unit 901 is further configured to receive a first report from the terminal device when the terminal device meets the trigger condition.
  • the report is used to indicate relevant information during the fast MCG link recovery process.
  • the communication unit 901 is also used to send a configuration message to the terminal device, where the configuration message is used to configure recording of a first report when fast MCG link recovery is successful and a trigger condition is met; wherein the configuration message includes the trigger condition.
  • the first report includes one or more of the following information: the running time of the first timer, identification information of the primary and secondary cells, trigger condition indication information of the first report, measurement information of the SCG, and information of the terminal device randomly accessing the SN; wherein, the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message.
  • the information of the terminal device's random access SN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempts, the amount of data to be transmitted for two-step random access, and one or more of the PUSCH configuration information for two-step random access.
  • the trigger condition includes one or more of the following items: the running time of the first timer is less than the first threshold value and greater than or equal to the second threshold value, and the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message; wherein the second threshold value is the product of the first threshold value and the first coefficient, and the first coefficient is a positive number less than 1; or, the second threshold value is a value less than the first threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the second timer corresponding to the SN is less than the third threshold value and greater than or equal to the fourth threshold value;
  • the running time of the second timer is: the time from when the terminal device detects that there is a physical layer desynchronization problem with the SN to when the terminal device detects that the radio link between the terminal device and the SN is restored; wherein the fourth threshold value is the product of the third threshold value and the second coefficient, and the second coefficient is a positive number less than 1; or, the fourth threshold value is a value less than the third threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the third timer corresponding to the SN is less than the fifth threshold value and greater than or equal to the sixth threshold value, and the running time of the third timer is: the time between the terminal device triggering the measurement report during the operation of the second timer and the terminal device detecting the recovery of the radio link between the terminal device and the SN; wherein the sixth threshold value is the product of the fifth threshold value and the third coefficient, and the third coefficient is a positive number less than 1; or, the sixth threshold value is a value less than the fifth threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the number of random access message transmissions between the terminal device and the SN is less than the seventh threshold value and greater than or equal to the eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and the fourth coefficient, and the fourth coefficient is a positive number less than 1; or, the eighth threshold value is less than the seventh threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the terminal device detects indication information from the radio link control layer of the SN, where the indication information is used to indicate that the number of repeated transmissions occurring in the radio link control layer is less than a ninth threshold value and greater than or equal to a tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and the fifth coefficient, and the fifth coefficient is a positive number less than 1; or, the tenth threshold value is less than the ninth threshold value;
  • the terminal device detects that RLF occurs between it and the MN, and the number of consecutive failures of executing uplink LBT on the SN is less than the eleventh threshold value and greater than or equal to the twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and the sixth coefficient, and the sixth coefficient is a positive number less than 1; or, the twelfth threshold value is less than the eleventh threshold value.
  • the first report also includes one or more of the following information: the running time of the second timer, the running time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring in the SN wireless link control layer, and the number of consecutive failures of performing LBT on the SN.
  • MCG failure information includes one or more of the following information: information of a first cell, where the first cell is a primary cell where the terminal device detects that RLF has occurred; information of a second cell, where the second cell is a source primary cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, where the first time information is used to indicate the duration between the moment when the terminal device received the last switching command and the moment of RLF; second time information, where the second time information is used to indicate the duration between the moment when the terminal device received the last CHO command and the moment of RLF; information of a MN randomly accessed by the terminal device; first indication information, where the first indication information is used to indicate that the MN measured by the terminal device as of the time of RLF is the first candidate cell of the CHO configured for the terminal device; and/or, a switching trigger condition for the first candidate cell; and second indication information, where the second indication information is used to indicate a second candidate cell measured by the terminal device other than the first
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • a communication device 900 may include: a communication unit 901; wherein:
  • the communication unit 901 is used to receive MCG failure information from the terminal device when RLF occurs between the terminal device and the MN; wherein the MCG failure information is used to request the execution of fast MCG link recovery; the communication unit 901 is also used to send the MCG failure information to the MN; the communication unit 901 is also used to receive a first message from the MN; wherein the first message includes a switching message or an RRC release message; the communication unit 901 is also used to send the first message to the terminal device; when the terminal device meets the triggering condition, the communication unit 901 is also used to receive a first report from the terminal device, and the first report is used to indicate relevant information in the process of executing fast MCG link recovery.
  • the first report includes one or more of the following information: the running time of the first timer, identification information of the primary and secondary cells, trigger condition indication information of the first report, measurement information of the SCG, and information of the terminal device randomly accessing the SN; wherein, the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message.
  • the trigger condition includes one or more of the following items: the running time of the first timer is less than the first threshold value and greater than or equal to the second threshold value, and the running time of the first timer is the time between the moment when the terminal device sends the MCG failure information and the moment when the terminal device receives the first message; wherein the second threshold value is the product of the first threshold value and the first coefficient, and the first coefficient is a positive number less than 1; or, the second threshold value is a value less than the first threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the second timer corresponding to the SN is less than the third threshold value and greater than or equal to the fourth threshold value;
  • the running time of the second timer is: the time from when the terminal device detects that there is a physical layer desynchronization problem with the SN to when the terminal device detects that the radio link between the terminal device and the SN is restored; wherein the fourth threshold value is the product of the third threshold value and the second coefficient, and the second coefficient is a positive number less than 1; or, the fourth threshold value is a value less than the third threshold value;
  • the terminal device detects that RLF occurs between the terminal device and the MN, and the running time of the third timer corresponding to the SN is less than the fifth threshold value and greater than or equal to the sixth threshold value, and the running time of the third timer is: the time between the terminal device triggering the measurement report during the operation of the second timer and the terminal device detecting the recovery of the radio link between the terminal device and the SN; wherein the sixth threshold value is the product of the fifth threshold value and the third coefficient, and the third coefficient is a positive number less than 1; or, the sixth threshold value is a value less than the fifth threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the number of random access message transmissions between the terminal device and the SN is less than the seventh threshold value and greater than or equal to the eighth threshold value; wherein the eighth threshold value is the product of the seventh threshold value and the fourth coefficient, and the fourth coefficient is a positive number less than 1; or, the eighth threshold value is less than the seventh threshold value;
  • the terminal device detects that an RLF occurs between the terminal device and the MN, and the terminal device detects indication information from the radio link control layer of the SN, where the indication information is used to indicate that the number of repeated transmissions occurring in the radio link control layer is less than the ninth threshold value and greater than or equal to the tenth threshold value; wherein the tenth threshold value is the product of the ninth threshold value and the fifth coefficient, and the fifth coefficient is a positive number less than 1; or, the tenth threshold value is less than the ninth threshold value;
  • the terminal device detects that RLF occurs between it and the MN, and the number of consecutive failures of executing uplink LBT on the SN is less than the eleventh threshold value and greater than or equal to the twelfth threshold value; wherein the twelfth threshold value is the product of the eleventh threshold value and the sixth coefficient, and the sixth coefficient is a positive number less than 1; or, the twelfth threshold value is less than the eleventh threshold value.
  • the first report also includes one or more of the following information: the running time of the second timer, the running time of the third timer, the number of random access message transmissions between the terminal device and the SN, the number of repeated transmissions occurring in the SN wireless link control layer, and the number of consecutive failures of performing LBT on the SN.
  • MCG failure information includes one or more of the following information: information of a first cell, where the first cell is a primary cell in which the terminal device detects that RLF has occurred; information of a second cell, where the second cell is a source primary cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, where the first time information is used to indicate the duration between the moment when the terminal device received the last switching command and the moment of RLF; second time information, where the second time information is used to indicate the duration between the moment when the terminal device received the last CHO command and the moment of RLF; information of a random access MN by the terminal device; first indication information, where the first indication information is used to indicate that the MN measured by the terminal device as of the time of RLF is the first candidate cell of the CHO configured for the terminal device; and/or, a switching trigger condition for the first candidate cell; and second indication information, where the second indication information is used to indicate a second candidate cell measured by the terminal device other than the first
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: the cell randomly accessed Identification information, frequency information of random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, amount of data to be transmitted for two-step random access or PUSCH configuration information for two-step random access.
  • a communication device 900 may include: a storage unit 903, a processing unit 902, and a communication unit 901;
  • the processing unit 902 is configured to determine MCG failure information when RLF occurs between the terminal device and the MN;
  • the communication unit 901 is used to send the MCG failure information to the MN through the SN; wherein the MCG failure information includes one or more of the following information: information of the first cell, the first cell is the main cell where the terminal device detects that RLF occurs; information of the second cell, the second cell is the source main cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, the first time information is used to indicate the duration between the moment when the terminal device receives the last switching command and the moment of RLF; second time information, the second time information is used to indicate the duration between the moment when the terminal device receives the last CHO command and the moment of RLF; information of the terminal device randomly accessing the MN; first indication information, the first indication information is used to indicate that the MN measured by the terminal device as of the time of RLF is the first candidate cell of the CHO configured by the terminal device; and/or, the switching trigger condition of the first candidate cell; second indication information, the second indication information is used to indicate the second candidate cell measured
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the storage unit 903 when RLF occurs between the terminal device and the MN, the storage unit 903 is used to record the RLF report; if a first message from the MN is received through the SN within the first time after the moment of sending the MCG failure information, the storage unit 903 is also used to release the RFL report; wherein the first message includes a switching message or an RRC release message.
  • a communication device 900 may include: a communication unit 901;
  • a communication unit 901 is configured to receive MCG failure information from a terminal device through an SN when RLF occurs between the terminal device and the MN; wherein the MCG failure information includes one or more of the following information: information of a first cell, where the first cell is a primary cell where the terminal device detects that RLF has occurred; information of a second cell, where the second cell is a source primary cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, where the first time information is used to indicate the duration between the moment when the terminal device receives the last switching command and the moment when the RLF occurs; second time information, where the second time information is used to indicate the duration between the moment when the terminal device receives the last CHO command and the moment when the RLF occurs; information on random access of the terminal device to the MN; first indication information, where the first indication information is used to indicate that the MN measured by the terminal device as of the time of the RLF is the first candidate cell for the CHO configured by the terminal device; and/or
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • a communication device 900 may include: a communication unit 901;
  • the communication unit 901 is used to receive MCG failure information from the terminal device when RLF occurs between the terminal device and the MN; and send the MCG failure information to the MN; wherein the MCG failure information includes one or more of the following information: information of the first cell, the first cell is the primary cell where the terminal device detects that the RLF occurs; information of the second cell, the second cell is the source primary cell of the last switching command received by the terminal device; information indicating the cause of the RLF failure; first time information, the first time information is used to indicate the duration between the time when the terminal device receives the last switching command and the time when the RLF occurs; second time information, the second time information is used to indicate the time between the time when the terminal device receives the last switching command and the time when the RLF occurs.
  • first indication information the first indication information is used to indicate that the MN measured by the terminal device as of the time of RLF is the first candidate cell for the CHO configured for the terminal device; and/or, the switching trigger condition of the first candidate cell; second indication information, the second indication information is used to indicate a second candidate cell measured by the terminal device other than the first candidate cell.
  • the information of the terminal device randomly accessing the MN includes one or more of the following items: cell identification information for random access, frequency information for random access, time-frequency domain configuration information, signal quality measurement information, indication information that the signal quality measurement information meets the quality threshold, beam information for random access attempt, the amount of data to be transmitted for two-step random access, or PUSCH configuration information for two-step random access.
  • the embodiment of the present application also provides a communication device 1000, and FIG10 is a schematic diagram of the structure of the communication device 1000.
  • the communication device 1000 can be a terminal device, or a chip, a chip system, or a processor that supports the terminal device to implement the above method.
  • the communication device 1000 can also be an MN, or a chip, a chip system, or a processor that supports the MN to implement the above method.
  • the communication device 1000 can also be an SN, or a chip, a chip system, or a processor that supports the SN to implement the above method.
  • the device can be used to implement the method described in the above method embodiment, and the details can be referred to the description in the above method embodiment.
  • the communication device 1000 may include one or more processors 1001.
  • the processor 1001 may be a general-purpose processor or a dedicated processor, etc.
  • it may be a baseband processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component or a central processing unit (CPU).
  • the baseband processor may be used to process the communication protocol and communication data
  • the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal, a terminal chip, a distributed unit (DU) or a centralized unit (CU), etc.), execute software programs, and process the data of the software programs.
  • DU distributed unit
  • CU centralized unit
  • the communication device 1000 may include one or more memories 1002, on which instructions 1004 may be stored, and the instructions may be executed on the processor 1001, so that the communication device 1000 performs the method described in the above method embodiment.
  • data may also be stored in the memory 1002.
  • the processor 1001 and the memory 1002 may be provided separately or integrated together.
  • the memory 1002 may include, but is not limited to, non-volatile memories such as a hard disk drive (HDD) or a solid-state drive (SSD), random access memory (RAM), erasable programmable ROM (EPROM), ROM or portable read-only memory (Compact Disc Read-Only Memory, CD-ROM), etc.
  • non-volatile memories such as a hard disk drive (HDD) or a solid-state drive (SSD), random access memory (RAM), erasable programmable ROM (EPROM), ROM or portable read-only memory (Compact Disc Read-Only Memory, CD-ROM), etc.
  • the communication device 1000 may further include a transceiver 1005 and an antenna 1006.
  • the transceiver 1005 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function.
  • the transceiver 1005 may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.
  • the communication device 1000 is a terminal device, and the communication device 1000 is used to execute the steps executed by the terminal device in the communication method shown in Figure 7, Figure 8a or Figure 8b above.
  • the communication device 1000 is a MN, and the communication device 1000 is used to execute the steps executed by the MN in the communication method shown in Figure 7, Figure 8a or Figure 8b above.
  • the communication device 1000 is a SN, and the communication device 1000 is used to execute the steps executed by the SN in the communication method shown in Figure 7, Figure 8a or Figure 8b above.
  • the processor 1001 may include a transceiver for implementing the receiving and sending functions.
  • the transceiver may be a transceiver circuit, or an interface, or an interface circuit.
  • the transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated.
  • the above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.
  • the processor 1001 may store an instruction 1003, and the instruction 1003 runs on the processor 1001, so that the communication device 1000 can execute the method described in the above method embodiment.
  • the instruction 1003 may be solidified in the processor 1001, in which case the processor 1001 may be implemented by hardware.
  • the communication device 1000 may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiments.
  • the processor and transceiver described in the embodiments of the present application can be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc.
  • IC integrated circuit
  • RFIC radio frequency integrated circuit
  • ASIC application specific integrated circuit
  • PCB printed circuit board
  • CMOS complementary metal oxide semiconductor
  • NMOS nMetal-oxide-semiconductor
  • PMOS positive channel metal oxide semiconductor
  • BJT bipolar junction transistor
  • BiCMOS bipolar CMOS
  • SiGe silicon germanium
  • GaAs gallium arsenide
  • the scope of the communication device described in the embodiments of the present application is not limited thereto, and the structure of the communication device may not be limited by FIG. 10.
  • the communication device may be an independent device or may be part of a larger device.
  • the communication device may be:
  • the IC set may also include a storage component for storing data and instructions;
  • ASIC such as a modem
  • the communication device and chip in the embodiment of the present application can also execute the implementation method described in the above-mentioned communication device 1000.
  • Those skilled in the art can also understand that the various illustrative logical blocks and steps listed in the embodiment of the present application can be implemented by electronic hardware, computer software, or a combination of the two. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art can use various methods to implement the described functions for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present application.
  • the present application also provides a computer-readable storage medium for storing computer software instructions, which, when executed by a communication device, implement the functions of any of the above method embodiments.
  • the present application also provides a computer program product for storing computer software instructions, which, when executed by a communication device, implement the functions of any of the above method embodiments.
  • the present application also provides a computer program, which, when executed on a computer, implements the functions of any of the above method embodiments.
  • the present application also provides a communication system, which includes one or more network devices, and the system may also include one or more terminal devices.
  • the system may also include other devices that interact with the network devices and terminal devices in the solution provided by the present application.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (DVD)), or a semiconductor medium (e.g., an SSD), etc.
  • a magnetic medium e.g., a floppy disk, a hard disk, a magnetic tape
  • an optical medium e.g., a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD semiconductor medium

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Abstract

本申请提供一种通信方法及装置。该方法包括：终端设备在与主节点发生无线链路失败时，终端设备通过辅节点向主节点发送主小区组失败信息，该主小区组失败信息用于请求执行快速主小区组链路恢复；在发送主小区组失败信息后的第一时间内，终端设备通过辅节点接收来自主节点的第一消息，该第一消息包括切换消息或无线资源控制释放消息；在满足触发条件下，终端设备记录第一报告，该第一报告指示执行快速主小区组链路恢复过程中的相关信息；终端设备向主节点或辅节点发送第一报告。通过此方法，网络设备可以根据第一报告分析快速主小区组链路恢复过程的潜在失败原因，从而进行移动性参数优化，降低执行快速主小区组链路恢复失败的概率，提升通信质量。

Description

一种通信方法及装置
本申请要求于2022年11月4日提交于中国国家知识产权局、申请号为202211379172.5、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在终端设备与主节点之间发生无线链路失败(radio link failure，RLF)时，为了避免终端设备进行无线资源控制(Radio Resource Control，RRC)重建而带来的长时间数据中断，提出了快速主小区组链路恢复(fast MCG link recovery)流程。fast MCG link recovery流程即是指，在终端设备检测到与主节点之间发生RLF时，终端设备可以通过辅节点与主节点进行信令交互，来恢复与主节点的RRC连接。
然而，即使fast MCG link recovery流程被成功执行，但也可能会存在失败的潜在问题，例如，在本次执行fast MCG link recovery的过程中，尽管fast MCG link recovery流程被成功执行，但终端设备与辅节点之间有发生RLF的可能，那么，后续在此情况下终端设备再进行fast MCG link recovery流程时，若终端设备与辅节点之间发生RLF，将使得终端设备无法通过辅节点与主节点之间进行信令交互，导致fast MCG link recovery流程执行失败的情况。
可见，如何降低失败的潜在问题为fast MCG link recovery流程执行成功而带来的不确定性，提升fast MCG link recovery流程成功的概率是一个亟待解决的问题。
发明内容
本申请实施例提供了一种通信方法及装置，有利于提升fast MCG link recovery流程成功的概率。
第一方面，本申请实施例提供一种通信方法，可应用于终端设备(例如终端设备的设备或芯片上)。该方法中，在终端设备与主节点之间发生RLF时，终端设备通过辅节点向主节点发送主小区组失败信息；其中，该主小区组失败信息用于请求执行快速主小区组链路恢复；在发送主小区组失败信息的时刻之后的第一时间内，终端设备通过辅节点接收到来自主节点的第一消息；其中，该第一消息包括切换消息或RRC释放消息；在满足触发条件的情况下，终端设备记录第一报告；其中，该第一报告用于指示执行fast MCG link recovery过程中的相关信息；进一步地，终端设备向主节点和/或辅节点发送该第一报告。
基于第一方面所描述的方法，终端设备在fast MCG link recovery成功且满足记录第一报告的触发条件下，终端设备会记录并上报执行fast MCG link recovery过程中的相关信息，以使网络设备(主节点和/或辅节点)可以根据该执行fast MCG link recovery过程中的相关信息，对fast MCG link recovery的配置(例如定时器的配置和辅小区组的移动性参数配置)等进行优化，从而提升fast MCG link recovery过程成功的概率，减少主小区组传输恢复的时延。其中，移动性参数是在判断切换过程中的可能会用到的参数，比如切换的信号阈值等。
一种可选的实施方式中，终端设备接收来自主节点的配置消息，该配置消息用于配置在fast MCG link recovery成功且满足触发条件的情况下记录该第一报告；其中，该配置消息包括触发条件。通过实施该可选的实施方式，在接收到来自主节点的配置消息的情况下，终端设备才会在fast MCG link recovery成功且满足触发条件的情况下记录该第一报告，从而提升了记录第一报告的灵活性。
一种可选的实施方式中，第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、第一报告的触发条件指示信息、辅小区组的测量信息、终端设备随机接入辅节点的信息；其中，第一计时器的运行时长为终端设备发送主小区组失败信息到终端设备接收第一消息的时刻之间的时长。
一种可选的实施方式中，终端设备随机接入辅节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的物理上行共享信道(physical uplink shared channel，PUSCH)配置信息的一项或者多项。
一种可选的实施方式中，触发条件包括以下项中的一种或多种：
第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备发送主小区组失败信息到终端设备接收第一消息的时刻之间的时长；其中，第二门限值为第一门限值与 第一系数的乘积，第一系数为小于1的正数；或者，第二门限值为小于第一门限值的数值；
或者，终端设备检测到与主节点之间发生RLF，且与辅节点对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；第二计时器的运行时长为：终端设备检测到与辅节点有物理层失步问题到终端设备检测到与辅节点之间无线链路恢复之间的时长；其中，第四门限值为第三门限值与第二系数的乘积，第二系数为小于1的正数；或者，第四门限值为小于第三门限值的数值；
或者，终端设备检测到与主节点之间发生RLF，且与辅节点对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为：第二计时器运行期间，终端设备触发测量报告到终端设备检测到与辅节点之间无线链路恢复之间的时长；其中，第六门限值为第五门限值与第三系数的乘积，第三系数为小于1的正数；或者，第六门限值为小于第五门限值的数值；
或者，终端设备检测到与主节点之间发生RLF，且终端设备与辅节点之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；其中，第八门限值为第七门限值与第四系数的乘积，第四系数为小于1的正数；或者，第八门限值为小于第七门限值；
或者，终端设备检测到与主节点之间发生RLF，终端设备检测到来自辅节点的无线链路控制层的指示信息，指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；其中，第十门限值为第九门限值与第五系数的乘积，第五系数为小于1的正数；或者，第十门限值为小于第九门限值；
或者，终端设备检测到与主节点之间发生RLF，在辅节点上执行上行先听后说(Listen Before Talk，LBT)的连续失败次数小于第十一门限值，且大于或等于第十二门限值；其中，第十二门限值为第十一门限值与第六系数的乘积，第六系数为小于1的正数；或者，第十二门限值为小于第十一门限值。
一种可选的实施方式中，第一报告还包括以下信息中的一种或多种：第二计时器的运行时长、第三计时器的运行时长、终端设备与辅节点之间的随机接入消息传输次数、在辅节点无线链路控制层发生的重复传输次数、在辅节点上执行LBT的连续失败次数。
一种可选的实施方式中，在终端设备与主节点之间发生RLF时，终端设备记录RLF报告；若在发送主小区组失败信息的时刻之后的第一时间内，终端设备通过辅节点接收到来自主节点的第一消息，则终端设备释放RLF报告。
一种可选的实施方式中，主小区组失败信息包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次条件切换命令的时刻与RLF的时间之间的时长；终端设备随机接入主节点的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的主节点为终端设备配置的条件切换的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。通过实施该可选的实施方式，对主小区组失败信息进行增强，确保主节点能在fast MCG link recovery成功的情况下获取完整的主小区组RLF信息，以使主节点可以根据该主小区组RLF信息进行主小区组相关的移动性参数优化，从而减少主小区组发生RLF的概率，减少主小区组服务中断时间。
一种可选的实施方式中，终端设备随机接入主节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
第二方面，本申请还提供一种通信处理方法，该方面的通信方法与第一方面的通信方法相对应，该方面的通信方法是从主节点侧进行阐述的(可应用于主节点的设备或芯片上)。该方法中，主节点通过辅节点接收来自终端设备的主小区组失败信息；其中，主小区组失败信息用于请求执行fast MCG link recovery；主节点通过辅节点向终端设备发送第一消息；其中，第一消息包括切换消息或RRC释放消息；在终端设备满足触发条件的情况下，主节点接收来自终端设备的第一报告，该第一报告用于指示执行fast MCG link recovery过程中的相关信息。
基于第二方面所提供方法的有益效果可参见第一方面所提供方法的有益效果，不再进行赘述。
一种可选的实施方式中，主节点向终端设备发送配置消息，该配置消息用于配置在fast MCG link recovery成功且满足触发条件的情况下记录第一报告；其中，配置消息包括触发条件。
在第二方面所提供的方法中，关于第一报告的内容可参见第一方面中关于第一报告的实施方式；关于触发条件的内容可参见第一方面中关于触发条件的实施方式；关于主小区组失败信息的内容可参见第一方面中关于主小区组失败信息的实施方式；在此不再赘述。
第三方面，本申请还提供一种通信处理方法，该方面的通信方法与第一方面和第二方面的通信方法相对应，该方面的通信方法是从辅节点侧进行阐述的(可应用于辅节点的设备或芯片上)。该方法中，辅节点接收来自终端设备的主小区组失败信息，并向主节点发送该主小区组失败信息；其中，主小区组失败信息用于请求执行fast MCG link recovery；辅节点接收来自主节点的第一消息，并向终端设备发送该第一消息；其中，第一消息包括切换消息或RRC释放消息；在终端设备满足触发条件的情况下，辅节点接收来自终端设备的第一报告，该第一报告用于指示执行fast MCG link recovery过程中的相关信息。
基于第三方面所提供方法的有益效果可参见第一方面所提供方法的有益效果，不再进行赘述。
在第三方面所提供的方法中，关于第一报告的内容可参见第一方面中关于第一报告的实施方式；关于触发条件的内容可参见第一方面中关于触发条件的实施方式；关于主小区组失败信息的内容可参见第一方面中关于主小区组失败信息的实施方式；在此不再赘述。
第四方面，本申请实施例提供一种通信方法，可应用于终端设备(例如终端设备的设备或芯片上)。该方法中，在终端设备与主节点之间发生RLF时，终端设备确定主小区组失败信息；并通过辅节点向主节点发送该主小区组失败信息；其中，主小区组失败信息包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为，终端设备接收的最后一次切换命令的源主小区；RLF的原因指示信息；第一时间信息；第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次条件切换命令的时刻与RLF的时刻之间的时长；终端设备随机接入主节点的信息；第一指示信息，第一指示信息用于指示RLF时，终端设备测量到的小区是否为主节点为终端设备配置的条件切换的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除了第一指示信息中的第一候选小区外的第二候选小区。
通过实施该可选的实施方式，对主小区组失败信息进行增强，确保主节点能在fast MCG link recovery成功的情况下获取完整的主小区组RLF信息，以使主节点可以根据该主小区组RLF信息进行主小区组移动性参数优化，从而减少发生主小区组RLF的概率，减少主小区组服务中断时间。
一种可选的实施方式中，终端设备随机接入主节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
一种可选的实施方式中，终端设备在与主节点之间发生RLF时，终端设备记录RLF报告；若在发送主小区组失败信息的时刻之后的第一时间内，终端设备通过辅节点接收到来自主节点的第一消息，则释放RFL报告；其中，第一消息包括切换消息或RRC释放消息。
第五方面，本申请实施例还提供一种通信处理方法，该方面的通信方法与第三方面的通信方法相对应，该方面的通信方法是从主节点侧进行阐述的(可应用于主节点的设备或芯片上)。该方法中，在终端设备与主节点之间发生RLF时，主节点通过辅节点接收来自终端设备的主小区组失败信息；其中，主小区组失败信息包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次条件切换命令的时刻与RLF的时间之间的时长；终端设备随机接入主节点的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的主节点为终端设备配置的条件切换的第一候选小区；和/或，在测量的小区为第一候选小区时，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
基于第五方面所提供方法的有益效果可参见第四方面所提供方法的有益效果，在此不再进行赘述。
一种可选的实施方式中，终端设备随机接入主节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
第六方面，本申请实施例还提供一种通信处理方法，该方面的通信方法与第四方面和第五方面的通信方法相对应，该方面的通信方法是从辅节点侧进行阐述的(可应用于辅节点的设备或芯片上)。该方法中，在终端设备与主节点之间发生RLF时，辅节点接收来自终端设备的主小区组失败信息，并向主节点发送该主小区组失败信息；其中，主小区组失败信息包括以下信息中的一种或多种：第一小区的信息，第一小区为主节点对应的主小区；第二小区的信息，第二小区为RLF之前，终端设备接收的最后一次切换命令中的源主小区；第一时间信息；第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；终端设备随机接入主节点的信息；第一指示信息，该第一指示信息用于指示RLF时，终端设备测量到的小区是否为主节点为终端设备配置的条件切换的第一候选小区；和/或，第一候选小区的切换触发条件。
基于第六方面所提供方法的有益效果可参见第四方面所提供方法的有益效果，在此不再进行赘述。
一种可选的实施方式中，终端设备随机接入主节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
第七方面，本申请提供一种通信装置，该装置可以是终端设备中的装置，或者是能够和终端设备匹配使用的装置。其中，该通信装置还可以为芯片或芯片系统。该通信装置可执行第一方面或第三方面所述的方法。该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。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第一方面或第四方面所述的方法以及有益效果，重复之处不再赘述。
第八方面，本申请提供一种通信装置，该装置可以是主节点中的装置，或者是能够和主节点匹配使用的装置。其中，该通信装置还可以为芯片系统。该通信装置可执行第二方面或第四方面所述的方法。该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。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第二方面或第五方面所述的方法以及有益效果，重复之处不再赘述。
第九方面，本申请提供一种通信装置，该装置可以是辅节点中的装置，或者是能够和辅节点匹配使用的装置。其中，该通信装置还可以为芯片系统。该通信装置可执行第五方面所述的方法。该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。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第三方面或第六方面所述的方法以及有益效果，重复之处不再赘述。
第十方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机执行指令，当该计算机执行指令被执行时，使得如第一方面或第四方面所述的方法中终端设备执行的方法被实现；或者，使得如第二方面或第五方面所述的方法中主节点执行的方法被实现；或者，使得如第三方面或第六方面所述的方法中辅节点执行的方法被实现。
第十一方面，本申请提供一种包括计算机程序的计算机程序产品，当该计算机程序被执行时，使得如第一方面或第四方面所述的方法中终端设备执行的方法被实现；或者，使得如第二方面或第五方面所述的方法中主节点执行的方法被实现；或者，使得如第三方面或第六方面所述的方法中辅节点执行的方法被实现。
第十二方面，本申请提供一种通信系统，该通信系统包括辅节点对应的装置和主节点对应的装置。或者，该通信系统还可以包括终端设备对应的通信装置。
附图说明
图1是本申请实施例提供的一种系统架构示意图；
图2是本申请实施例提供的一种网络设备的结构示意图；
图3是本申请实施例提供的另一种网络设备的结构示意图；
图4是本申请实施例提供的一种CHO的过程示意图；
图5是本申请实施例提供的一种MR-DC中各小区的架构示意图；
图6是本申请实施例提供的一种快速主小区组链路恢复的流程示意图；
图7是本申请实施例提供的一种通信方法的流程示意图；
图8a是本申请实施例提供的另一种通信方法的流程示意图；
图8b是本申请实施例提供的另一种通信方法的流程示意图；
图9是本申请实施例提供的一种通信装置的结构示意图；
图10是本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
下面结合附图对本申请具体实施例作进一步的详细描述。
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上，“至少两个(项)”是指两个或三个及三个以上，“和/或”，用于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：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b或c中的至少一项(个)，可以表示：a，b，c，“a和b”，“a和c”，“b和c”，或“a和b和c”，其中a，b，c可以是单个，也可以是多个。
为了更好地理解本申请实施例，下面首先对本申请实施例涉及的系统架构进行介绍：
本申请实施例可应用于长期演进(long term evolution，LTE)系统、第五代移动通信(5th generation mobile communication，5G)系统、第六代移动通信(6th generation mobile communication，6G)系统等5G之后演进的通信系统、卫星通信及短距等无线通信系统中。其中，本申请实施例提及的无线通信系统包括但不限于：窄带物联网系统(narrow band-internet of things，NB-IoT)、5G/6G移动通信系统的三大应用场景：增强移动宽带(enhanced mobile broadband，eMBB)、超可靠低时延通信(ultra reliable low latency communication，URLLC)和海量机器类通信(massive machine type of communication，mMTC)，无线保真(wireless fidelity，WiFi)系统。
无线通信系统可以包括一个或多个网络设备，以及一个或多个终端设备。无线通信系统也可以进行点对点通信，如多个终端设备之间互相通信。下面以图1所示的系统架构进行示例性讲解。在图1所示的系统架构中，包括2个网络设备(即网络设备1和网络设备2)和1个终端设备(即终端设备1)，该终端设备1可同时与网络设备1和网络设备2通信。下面再对图1中系统架构所涉及的终端设备和网络设备进行详细说明。
一、终端设备
终端设备包括向用户提供语音和/或数据连通性的设备，例如终端设备是一种具有无线收发功能的设备。终端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)。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、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、车载终端、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、可穿戴终端等等。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终端、用户设备(user equipment，UE)、接入终端、车载终端、工业控制终端、移动站、移动台、远方站、远程终端、移动设备、无线通信设备等。终端设备也可以是固定的或者移动的。可以理解，本申请中的终端设备的全部或部分功能也可以通过在硬件上运行的软件功能来实现，或者通过平台(例如云平台)上实例化的虚拟化功能来实现。
二、网络设备
在本申请实施例中，网络设备是具有无线收发功能的设备，用于与终端设备进行通信。例如，网络设备是将终端设备接入到无线网络的无线接入网(radio access network，RAN)节点。RAN节点包括但不限于是：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller， BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)、接入回传一体化(integrated access and backhaul，IAB)等。
在一种网络结构中，网络设备可以包括集中单元(centralized unit，CU)和/或，包括分布单元(distributed unit，DU)。
在一种网络结构中，如图2所示，网络设备包括CU和DU。其中，CU可以划分为控制面(control plane)和用户面(user plane)，即CU包括CU-CP和CU-UP。其中，CU-CP负责控制面功能，主要包含RRC层和分组数据汇聚协议-控制面(packet data convergence protocol control plane，PDCP-C)层功能。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)层和分组数据汇聚协议-用户面(packet data convergence protocol user plane，PDCP-U)功能。其中，SDAP主要负责将核心网的数据进行处理并将映射到承载。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。另外，CU-CP和CU-UP通过E1接口连接，CU-CP通过F1-C接口和DU连接，CU-UP通过F1-U接口和DU连接。还有一种可能的实现是PDCP-C也在CU-UP中。DU包括无线链路控制(radio link control，RLC)层、介质访问控制(media access control，MAC)层和物理(physical，PHY)层功能。
在另一种网络结构中，如图3所示，网络设备包括CU和两个DU。其中，CU包括RRC层、SDAP层和PDCP层功能，DU包括RLC层、MAC层和PHY层功能。CU均通过F1接口和两个DU连接。
网络设备可以和核心网设备进行通信交互，向终端设备提供通信服务。核心网设备例如为5G核心网(core network，CN)中的设备。核心网作为承载网络提供到数据网络的接口，为终端提供通信连接、认证、管理、策略控制以及对数据业务完成承载等。
需要说明的是，图1所示的系统架构中终端设备和网络设备的数量仅是示意性的，并不能视为是对本申请技术方案的具体限定。
为了方便理解本方案的内容，下面再对本申请实施例中涉及的部分用语进行解释说明，以便于本领域技术人员理解，此部分仅是为了便于理解，并不能视为对本申请的具体限定。
1、条件切换(conditional handover，CHO)。
CHO机制：源基站在与终端设备的源链路信号质量较好时，向终端设备发送CHO配置信息，该CHO配置信息中包括一个或多个候选小区的信息例如，候选小区的全球小区标识(cell global identifier，CGI)、每个候选小区对应的CHO触发条件；或者，包括一个或多个候选小区的物理小区标识(physical cell Identifier，PCI)以及每个候选小区对应的频率信息。进一步地，终端设备在接收源基站配置的CHO配置信息后，确定该CHO配置信息中配置的候选小区的小区质量是否满足CHO触发条件，将满足CHO触发条件的小区作为目标切换小区，并向该目标切换小区发起随机接入信道(random access channel，RACH)。终端设备随机接入目标切换小区成功时，终端设备向目标切换小区所属的基站(即目标基站)发送CHO完成消息，以通知目标基站与该目标基站的CHO完成。
示例性的，图4为终端设备进行CHO的过程。如图4所示，终端设备与源基站通信，源基站向终端设备发送RRC重配置信息，该RRC重配置信息包括测量配置信息。终端设备根据测量配置信息对邻小区进行测量，并将测量结果以测量报告(measurement report)的方式上报给源基站。源基站根据测量报告确定邻小区信号质量较好的小区，并分别向信号质量较好的邻小区所属的候选基站1和候选基站2发送CHO请求。如果源基站均收到候选基站1和候选基站2回复的CHO请求确认应答(conditional handover request acknowledge，CHO request ACK)，则视为源基站与候选基站1和候选基站2之间完成了CHO交互。源基站在向终端设备发送CHO配置信息，该CHO配置信息包括候选基站1所属的候选小区1、候选基站2所属的候选小区2，以及候选小区1和候选小区2分别对应的CHO触发条件(比如，CHO触发条件为信号质量阈值)。如果终端设备确定与候选小区1之间的信号质量满足CHO触发条件，向候选基站1发起RACH。终端设备在RACH完成后，向候选基站1发送CHO完成消息，以通知候选基站1与该候选基站1的CHO完成。
2、多模双连接(multi-radio dual connectivity，MR-DC)
无线网络中，一个终端设备同时与多个网络设备进行通信的通信方式被称为MR-DC。MR-DC也可被称为双连接(dual-connectivity，DC)。MR-DC中，与终端设备同时通信的多个网络设备可以是属于同一个无线接入技术(radio access technology，RAT)的网络设备，比如该多个网络设备均是4G基站，或者均是5G基站；或者，与终端设备同时通信的多个网络设备也可以是不同RAT的网络设备，比如该多个网络 设备中的部分网络设备是4G基站，其余部分网络设备是5G基站。
在MD-RC中，与核心网有控制面信令交互的网络设备称为主节点(master node，MN)，其他网络设备称为辅节点(secondary node，SN)，MN和/或SN与核心网可以进行数据面通信。当网络设备为基站时，MN可以是主基站，SN可以是辅基站。如图1所示，与终端设备1连接的网络设备包括网络设备1和网络设备2，且网络设备1用于与核心网进行控制面信令交互，则网络设备1为终端设备1的MN，网络设备2为终端设备1的SN。
在MR-DC中，终端设备可以接收来自一个基站所属的多个小区的服务，MN为终端设备提供服务的小区组可称为主小区组(master cell group，MCG)，SN为终端设备提供服务的小区组可称为辅小区组(secondary cell group，SCG)，该MCG和SCG中分别包含至少一个cell。其中，MCG中包含一个主小区(primary cell，Pcell)，该Pcell是指部署在主频点，且终端设备在小区发起初始连接建立过程或发起连接重建过程，或者在切换过程中指示为主小区的小区。SCG包含一个主辅小区(primary secondary cell，PSCell)，PSCell是指终端设备在辅基站发起随机接入过程的小区，或者当终端设备在辅基站改变过程中跳过随机接入过程发起数据传输的小区，或者执行同步的重配过程中发起随机接入的辅基站的小区。PCell和PSCell也可称为特别小区(special cell，SpCell)。当MCG或SCG中包含多个小区时，除了PCell和SpCell之外的小区均被称为辅小区(secondary cell，SCell)，SCell是指工作在辅载波上的小区。
图5为MR-DC中各种小区的架构示意图。如图5所示，终端设备与多个网络设备建立连接时，为终端设备服务的小区组包括MCG和SCG。MCG中包括Pcell和其他SCell，SCG中包括PSCell和其他SCell。小区组中的SCell与SpCell进行载波聚合(carrier Aggregation，CA)，即终端设备同时使用多个小区(载波)进行上下行通信，以支持高速数据传输。
3、移动鲁棒性优化(mobility robustness optimization，MRO)机制
MRO机制是指：终端设备发生与移动性相关的异常情况(比如终端设备切换失败，终端设备在目标小区的RLF等)时，向网络设备上报发生移动性相关的异常参数，网络设备根据该相关的异常参数进行自主分析、优化网络参数等。
示例性的，网络设备会基于性能指标的反馈来调整移动性参数，性能指标的反馈可以是通过RLF报告(又称RLF report)或成功切换报告(successful handover report，SHR)等报告来反馈。移动性参数包括在判断切换过程中所用的参数，比如切换的信号质量阈值等。MRO机制可减少因网络参数设置不合理而导致的同频切换、异频切换、异系统切换等切换中的切换过早、切换过晚以及乒乓切换等问题。
需要说明的是，通常RLF报告和SHR的上报机制是延迟上报的，即终端设备记录了RLF报告和SHR，当终端设备接入网络设备后，终端设备向该网络设备发送指示信息以指示RLF报告或SHR存在。进一步地，网络设备通过向终端设备信息发送终端设备信息请求(UE Information Request)消息，请求终端设备上报RLF报告或SHR；终端设备通过终端设备信息响应(UE Information Response)消息将该RLF报告或SHR发送给网络设备，进而网络设备根据该RLF报告和SHR识别移动性过程问题并优化移动性参数。
4、关于RLF report
通常终端设备在以下两种情况下会记录RLF report：情况一、终端设备未接收到切换消息或者接收到了CHO配置未触发，发生了RLF；情况二、终端设备接收到了切换消息、或者接收到双激活协议栈(dual active protocol stack，DAPS)切换消息、或接收到CHO配置并触发执行连接至目标小区，但接入目标小区失败或接入目标小区后很快发生RLF。
示例性的，RLF report中包括但不限于以下信息中的一种或多种：
1)失败的主小区标识(failedPcellID)。failedPcellID为包括终端设备检测到RLF的主小区，用于指示该主小区的小区信息，或者切换失败(handover failure，HOF)的目标小区信息。
2)连接失败类型(connectionFailureType)。connectionFailureType包括终端设备发生RLF，或者终端设备切换失败，或者终端设备启动的定时器(比如发送测量报告后启动的T312定时器)到期等失败类型。
3)源主小区标识(previousPCellID)。previous PCell ID包括终端设备最后一次接收到切换命令的源小区信息。
4)重建小区标识(reestablishmentCellId)。reestablishmentCellId包括终端设备连接失败后发起RRC连接重建立(后文简称RRC重建)的小区信息。
5)连接失败时间(timeConnFailure)。timeConnFailure包括终端设备最后一次收到HO命令到连接失败的时间。
6)失败时间(timeSinceFailure)。timeSinceFailure包括终端设备连接失败时开始记录的时间长度，一 般指终端设备连接失败到上报RLF report的时间。
7)RLF原因(rlf-Cause)。rlf-Cause包括终端设备发生RLF的原因，或者切换失败的原因。例如，rlf-Cause为T310定时器超时，或者为随机接入问题(randomAccessProblem)，或者为波束失败恢复失败(beamFailureRecoveryFailure)，或者为先听后说失败(Listen Before Talk failure，LBT failure)，或者为RLC重传次数过多等。
8)上一次切换类型(last HO-Type)。last HO-Type用于指示终端设备上一次执行的切换是CHO还是双激活协议栈(dual active protocol handover，DAPS)切换。
9)CHO重配时间(timeSinceCHO-Reconfig)。timeSinceCHO-Reconfig包括最后一次收到CHO命令到CHO切换失败或者RLF的时间。
10)DAPS切换的源小区RLF的时间(timeConnSourceDAPS-Failure)。timeConnSourceDAPS-Failure包括最后一次DAPS切换到源小区RLF的时间。
11)条件切换小区标识(CHOCellId)。终端设备执行基于CHO的恢复(CHO based recovery)的CHO候选小区。
12)服务小区测量结果(measResultLastServCell)：基于UE检测到RLF时刻收集的PCell或切换失败时源PCell可用的同步信号块(synchronization signal block，SSB)和信道状态参考信号(channel state information reference signal，CSI-RS)测量结果，包括RSRP，RSRQ和SINR的一种或者多种。
13)邻区测量结果(measResultNeighCells)：基于UE检测到失败时刻收集的时除了7)RLF中服务小区外测量到的小区可用的SSB和CSI-RS测量结果，包括参考信号接收功率(reference signal receiving power，RSRP)，参考信号接收质量(reference signal receiving quality，RSRQ)和信干噪比(signal to interference plus noise ratio，SINR)的一种或者多种。包括CHO候选小区的指示信息以及触发条件；
14)条件切换候选小区(CHOCandidateCellList)。CHOCandidateCellList包括邻区测量中CHO候选小区之外的其他CHO候选小区；
15)随机接入信息(RA-InformationCommon)。RA-InformationCommon包括HOF，或者，由于随机接入问题或者波束失败恢复失败导致的RLF时，记录随机接入相关的信息，包括随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的PUSCH配置信息的一项或者多项。
上述所涉及到的小区标识信息可包括CGI，和/或，PCI与频率。此外，RLF report中还可包括各小区的小区质量，比如检测到RLF时的失败小区和/或邻区的小区质量。可选的，小区标识信息还可包括小区的测量结果。
通常当终端设备发生了连接失败(或称链路失败)，终端设备会记录RLF report；当终端设备再次发生连接失败，终端设备会清空之前记录的RLF report，记录最新的RLF report。
5、关于成功切换报告(Successful Handover Report，SHR)
在移动性成功的场景中，也可能存在导致移动性失败的潜在问题。可以理解的是，潜在失败并不代表真正的失败，而是在终端设备切换的过程中，遇到临近切换失败的现象，所以进行SHR记录。为了识别移动性成功场景下的潜在移动性失败的问题，引入了终端设备记录和上报切换成功过程中的参数给网络，即终端设备向源基站上报SHR，该SHR用以记录具有潜在失败问题的成功切换场景中的移动性相关的信息，源基站可以结合SHR信息和终端设备上下文，来对终端设备的移动性参数进行优化。
在一个可能的实施方式中，终端设备从源基站成功切换至目标基站之后，源基站接收来自目标基站的终端设备上下文释放(即UE context release)消息，释放终端设备的上下文。需要说明的是，终端设备上下文通常指终端设备与网络设备之间建立的链路，具体内容包括终端设备的鉴权信息、终端设备的网络能力等。终端设备向该目标基站发送SHR，进而目标基站将该SHR转发至与源基站。
源基站可以通过给终端设备发送的RRC重配置(又称RRC Reconfiguration)消息，为终端设备配置记录SHR触发条件(又称SHR trigger condition)，终端设备在满足该SHR trigger condition时才记录SHR。该SHR trigger condition包括但不限于：1.计时器(timer)超时(例如T304/T310/T312三种计时器的计时结果到达特定门限)；2.DAPS切换期间内在源小区发生了RLF。
其中，关于T304计时器、T310计时器、T312计时器的定义如下：
1)T304计时器
终端设备在接收到RRC重配置消息时启动T304计时器，T304计时器的运行时长用于指示终端设备 接收RRC重配置消息之后到成功完成向目标网络设备的随机接入的时长。当T304计时器的运行时长到达阈值1时，该T304计时器超时，终端设备确定发生切换失败；当T304计时器的运行时长小于该阈值1，但大于或等于阈值2时，终端设备认为存在潜在切换失败，会触发SHR记录。这里阈值1的值大于阈值2的值。需要说明的是，本申请所提及的阈值(包括阈值1～阈值6)均为预设值，其具体数值可根据具体应用场景进行相应的调整，本申请不进行具体限定。
2)T310计时器
在终端设备进行无线链路检测时，当连续收到下行失步指示(out of synchronization，out of sync)个数等于N310时，启动T310计时器；当终端设备又连续收到下行同步指示(in of synchronization，in sync)个数等于N311时，停止T310计时。在T310计时器超时的情况下，终端设备认定检测到RLF，触发RRC连接重建过程。其中，N310为设置启动T310计时器所需要收到的最大连续下行out of sync个数，N311为设置的设置停止T310定时器所需要收到的最大连续下行in sync的个数。
终端设备在检测到与源网络设备之间有物理层失步问题时启动T310计时器，在该T310计时器运行期间，如果无线链路恢复，则该T310计时器停止。该T310计时器的运行时长用于指示终端设备检测到与源网络设备之间有物理层失步问题时到终端设备检测到无线链路恢复时之间的时长。当T310计时器的运行时长大于或等于阈值3时，该T310计时器超时，终端设备确定发生RLF；当T310计时器的运行时长小于该阈值3，但大于或等于阈值4时，终端设备会认为存在发生RLF的潜在可能，会触发SHR记录。这里阈值3的值大于阈值4的值。
3)T312计时器
在T310计时器的运行期间，终端设备发送了测量报告则启动T312计时器；当终端设备从L1检测到连续N312个同步指示后停止T312定时器。MCG对应的T312计时器一旦超时，则触发终端设备进行RRC重建；SCG对应的T312计时器一旦超时，则终端设备向SN发送辅小区组失败信息(即SCG failure information)。
在T310计时器的运行期间，终端设备触发测量报告时启动T312计时器，在终端设备检测到无线链路恢复时，则该T312计时器停止。T312计时器的运行时长指示在T310计时器的运行期间，终端设备触发测量报告至终端设备与源网络设备之间无线链路恢复之间的时长。当该T312计时器的运行时长大于或等于阈值5时，该T312计时器超时，终端设备确定发生RLF；当该T312计时器的运行时长小于该阈值5，但大于或等于阈值6时，终端设备认为存在发生RLF的潜在可能，会触发SHR记录。这里阈值5的值大于阈值6的值。
综上所述，因T304计时器触发记录的SHR，通常指向终端设备在对目标小区的接入过程中产生的潜在失败，例如切换过早(too early Handover)所导致；因T310/T312计时器或者DAPS切换期间在源小区发生的RLF触发记录的SHR，通常指向UE与源小区之间的潜在失败，例如切换过晚(too late Handover)所导致。
6、fast MCG link recovery流程
示例性的，请参见图6所示的fast MCG link recovery的流程示意图。其中：
S601、源MN与SN交互支持fast MCG link recovery流程的方式。
换言之，源MN向SN发送请求消息，该请求消息用于请求SN支持通过分离(split)的信令无线承载(signaling radio bearer，SRB)1或SRB3进行fast MCG link recovery流程。SN向源MN发送响应消息，该响应消息用于支持通过split SRB1或SRB3进行fast MCG link recovery流程。fast MCG link recovery流程是指终端设备与源MN之间发生MCG RLF后，UE与SN之间通过SRB3或者split SRB1进行fast MCG link recovery的信令交互。
S602、源MN向终端设备配置fast MCG link recovery流程。
换言之，源MN通过RRC重配置消息向终端设备下发用于fast MCG link recovery的配置信息，以使得终端设备在与源MN之间发生MCG RLF后，可通过与SN进行信息的交互执行fast MCG link recovery流程。其中，该配置消息中包括为终端设备配置执行MCG快速恢复时使用split SRB1或SRB3，以及配置第一定时器(例如T316定时器)。
需要说明的是，第一计时器(例如T316计时器)在终端设备向SN发送主小区组失败信息(即执行S604)时启动，在定时器运行期间，终端设备通过SN接收来自源MN的第一消息(即执行S605)时停止，否则直到定时器超期。也就是说，定时器未超期的话，第一计时器(例如T316计时器)的运行时长为终端设备发送MCG failure information的时刻到终端设备接收第一消息的时刻之间的时长。
S603、终端设备检测到与源MN之间发生MCG RLF，将RLF信息包括在RLF报告中。
在终端设备检测到与MCG之间发生RLF时，终端设备记录RLF报告，其中，RLF报告内容可参见前述对RLF报告的描述。
S604、终端设备向SN发送主小区组失败信息(MCG failure information)并且启动第一计时器(例如T316计时器)。相应的，SN向源MN转发MCG failure information。
在终端设备与SCG之间的传输可用的情况下，终端设备向SN发送MCG failure information并启动第一计时器(例如T316计时器)。其中，终端设备与SCG之间的传输可用包括：SCG的传输没有挂起、终端设备与SCG之间的连接没有断开、SCG没有去激活、没有PScell变更/增加正在进行。在终端设备与SCG之间的传输不可用的情况下，终端设备执行RRC重建。
在一个可能的实施方式中，该MCG failure information包括MCG可用的测量结果(即终端设备通过SCG RRC信令为终端设备配置测量频点所测量到的可用结果，包括MCG中PCell的测量结果和该PCell的邻区测量结果)、SCG可用的测量结果(即终端设备通过SCG RRC信令为终端设备配置测量频点所测量到的可用结果，包括SCG中PSCell的测量结果和该PSCell的邻区测量结果)、MCG链路失败类型(例如T310计时器超时、T312计时器超时、random Access Problem、beam Failure Recovery Failure、LBT failure、RLC重传失败过多等)。
S605、在第一计时器超时之前，终端设备通过SN接收来自源MN的第一消息(切换消息或RRC释放消息)。相应的，源MN向SN发送第一消息，SN将该第一消息转发给终端设备。
可以理解的是，第一计时器配置有超时门限值，当第一计时器的计时结果达到超时门限时，则第一计时器停止计时。若在第一计时器超时之前(或理解为第一计时器运行期间)，终端设备通过SN接收到来自源MN的第一消息，则表明终端设备执行fast MCG link recovery成功，终端设备清除该S603中记录的RLF报告。若在第一计时器超时之前终端设备未通过SN接收到来自源MN的第一消息，则终端设备执行fast MCG link recovery失败，终端设备保存该S603中记录的RLF报告，终端设备执行RRC重建，进行小区重选。
其中，切换消息是源MN选择合适的小区发起切换请求，目标MN响应该切换请求后，源MN向终端设备发送的切换命令。从而终端设备基于切换命令，执行切换和数据转发。RRC释放消息是源MN向终端设备发送的RRC连接释放信息。终端设备接收到该RRC释放消息后，进行小区重选，确认存在符合小区重选条件的新小区后，终端设备尝试驻留到该新小区。
在一个可能的实施方式中，S603执行之前，源MN向候选MN发送CHO请求，以请求终端设备可向候选MN进行CHO，源MN接收到该候选MN发送的确认消息之后，表明终端设备后续可向该候选MN进行CHO。进而，源MN通过RRC重配置消息向终端设备配置CHO配置信息，该CHO配置信息包括候选小区无线空口配置，以及候选小区对应的CHO执行触发条件。进一步地，当在S605中终端设备接收到的CHO消息时，终端设备持续评估是否有候选MN满足CHO执行触发条件，直到终端设备检测到有一个候选目标小区满足了对应的切换执行触发条件时，执行CHO，向该目标基站执行随机接入并建立RRC连接，同时拆除与源基站的连接。在本申请的一个应用场景中，在终端设备被配置CHO，但是CHO未触发的情况下，终端设备检测到S603的MCG RLF。
S606、终端设备根据该第一消息执行切换或进入空闲态，重新建立MCG RRC连接，恢复终端设备的MCG链路。
若第一消息为切换消息，则终端设备根据该第一消息指示的切换目标小区执行切换，向该目标小区执行随机接入并建立RRC连接。若第一消息为RRC释放消息，则终端设备进入空闲态进行小区选择，如果选择到合适的小区则执行RRC连接建立。
在图6所示的fast MCG link recovery尽管成功了，但终端设备在执行fast MCG link recovery的过程中可能会存在一些导致fast MCG link recovery失败的潜在失败原因，例如：终端设备与SCG接近发生RLF(例如，在终端设备向辅节点发送随机接入消息的次数接近于门限值，若超过该门限值，则终端设备随机接入辅节点失败)、或终端设备从发送MCG failure information到接收到第一消息的时间过长(接近第一计时器的超时门限值，即第一计时器接近超时)等。这些潜在失败原因，为成功恢复MCG链路增添了不确定性。因而，如何减少因为前述潜在失败原因导致的执行fast MCG link recovery失败是一个亟待解决的问题。
为了提升执行fast MCG link recovery成功的概率，本申请提供一种通信方法，请参见图7的该通信方 法的流程示意图。如图7所示，图7以终端设备连接的MN、SN和终端设备为执行主体为例进行说明。可以理解，该通信方法执行主体也可以为MN中的芯片、SN中的芯片和终端设备中的芯片。其中：
S701、在终端设备与MN之间发生RLF时，终端设备通过SN向MN发送MCG failure information。相应地，MN通过SN接收来自终端设备的MCG failure information。
换言之，在MR-DC的终端设备与MN之间发生RLF时，终端设备与SN(或理解为SCG)之间的连接仍存在，从而终端设备可以向SN发送MCG failure information，以使SN将该MCG failure information转发给MN。其中，关于S701实施方式的具体描述可参见对前述S604实施方式的具体描述，在此不再进行描述。
需要说明的是，在S701中所提及的MCG failure information的内容可参见前述S604中关于MCG failure information的相关描述；该MCG failure information的内容也可参见后续S801中关于MCG failure information的相关描述。
S702、在发送MCG failure information的时刻之后的第一时间内，终端设备通过SN接收来自MN的第一消息。相应地，MN通过SN向终端设备发送第一消息。示例性的，该第一消息包括切换消息或RRC释放消息。
其中，第一时间可以理解为第一计时器的运行时长在该第一计时器的超时门限值内。关于S702实施方式的具体描述可参见对前述S605实施方式的具体描述。其中，第一计时器可以是T316计时器。
S703、在满足触发条件的情况下，终端设备记录第一报告，该第一报告用于指示执行fast MCG link recovery过程中的相关信息。
也就是说，终端设备在第一计时器的运行时长在该第一计时器的超时门限内，即第一计时器超时之前，终端设备接收到第一消息的情况下，终端设备确定是否满足触发条件。若满足触发条件，则终端设备记录第一报告；反之，在不满足触发条件的情况下或fast MCG link recovery失败的情况下，终端设备不记录该第一报告。其中，第一报告可以是SHR，也可以是其他类型的报告，本申请对此不做限定。
示例性的，第一报告包括以下信息中的一种或多种：(1)第一计时器的运行时长。(2)主辅小区的标识信息。(3)第一报告的触发条件指示信息，用于指示本次触发记录第一报告的触发原因(即本次触发记录第一报告所满足的触发条件)。例如，在第一报告中通过触发条件对应的触发条件原因值指示该触发条件是否满足，当该触发条件对应的触发条件原因值指示为True时，则本次记录第一报告满足的触发条件包括该触发条件；当该触发条件对应的触发条件原因值指示为False时，则本次记录第一报告满足的触发条件不包括该触发条件。(4)SCG的测量信息，终端设备根据SN配置的测量配置(包括配置测量频点等)所测量到的测量信息，包括SCG中PSCell的测量结果和该PSCell邻区测量结果。(5)终端设备随机接入SN的信息，若终端设备随机接入SN(或SCG)的过程中Msg1和/或MsgA的传输次数过多，即终端设备随机接入SN的过程中Msg1和/或MsgA的传输次数大于预设次数，则确定终端设备与SCG之间接近发生RLF(即存在潜在的SCG RLF)，在这种情况下，触发记录该第一报告，该第一报告中包括终端设备随机接入SN的信息。其中，终端设备随机接入SN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的PUSCH配置信息的一项或者多项。
也就是说，终端设备通过第一报告可以指示在执行fast MCG link recovery过程中的SN相关信息(包括根据SN为终端设备的配置测量终端设备所测量到的测量结果信息和随机接入SN的信息的一项或者多项)，和/或，执行fast MCG link recovery过程的时长信息。
在一个可能的实施方式中，终端设备可以接收来自MN的配置消息，该配置消息用于配置终端设备在fast MCG link recovery成功且满足触发条件的情况下记录第一报告。其中，该配置消息包括记录第一报告的触发条件。换言之，MN通过配置消息向终端设备配置触发记录第一报告的触发条件，没有接收到MN的配置消息的终端设备，不会记录第一报告，从而提升终端设备记录第一报告的灵活性。其中，该配置消息可以和S602中配置fast recovery流程的RRC重配消息为同一消息，也可以是除该S602中配置fast recovery流程的RRC重配消息之外的其他RRC重配消息。
下面再对触发条件进行详细说明，该触发条件可以包括以下项目中的一种或多种：
触发条件一、第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长。
可以理解的是，第一门限值为该第一计时器的超时门限值，当第一计时器的运行时长到达第一门限值， 则第一计时器超时，fast MCG link recovery失败；当第一计时器的运行时长小于第一门限值，但大于或等于第二门限时，终端设备会认为存在fast MCG link recovery失败的潜在可能，触发记录第一报告。其中，第二门限值为小于第一门限值的数值；或者，第二门限值为第一门限值与第一系数的乘积，第一系数为小于1的正数，例如第一系数为百分比系数，用于指示第二门限值所占该第一计时器超时门限值的比例。
触发条件二、终端设备检测到与MN之间发生RLF，且与SN对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；第二计时器的运行时长为：终端设备检测到与SN有物理层失步问题到终端设备检测到与SN之间无线链路恢复之间的时长。其中，第二计时器可以是前述T310计时器。
可以理解的是，第三门限值为该第二计时器的超时门限值，当第二计时器的运行时长到达第三门限值，则第二计时器超时，终端设备与SN之间接近发生RLF，终端设备无法通过SN与MN进行信令交互，从而进而导致fast MCG link recovery失败；当第二计时器的运行时长小于第三门限值，但大于或等于第四门限时，终端设备会认为终端设备与SN之间存在RLF的潜在可能，触发记录第一报告。其中，第四门限值为小于第三门限值的数值；或者，第四门限值为第三门限值与第二系数的乘积，该第二系数为小于1的正数，例如第二系数为百分比系数，用于指示第四门限值所占该第二计时器超时门限值的比例。
触发条件三、终端设备检测到与MN之间发生RLF，且与SN对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为：第二计时器运行期间，终端设备触发测量报告到终端设备检测到与SN之间无线链路恢复之间的时长。其中，第三计时器可以是前述T312计时器。
可以理解的是，第五门限值为该第三计时器的超时门限值，当第三计时器的运行时长到达第五门限值，则第三计时器超时，终端设备与SN之间发生RLF，进而导致fast MCG link recovery失败；当第三计时器的运行时长小于第五门限值，但大于或等于第六门限值时，终端设备会认为终端设备与SN之间存在RLF的潜在可能，触发记录第一报告。其中，第六门限值为小于第五门限值的数值；或者，第六门限值为第五门限值与第三系数的乘积，该第三系数为小于1的正数，例如第三系数为百分比系数，用于指示第六门限所占该第三计时器超时门限值的比例。
触发条件四、终端设备检测到与MN之间发生RLF，且终端设备与SN之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值。
可以理解的是，当终端设备与SN之间的随机接入消息(例如Msg1和/或MsgA)传输次数到达第七门限值，则终端设备随机接入SN失败，进而导致fast MCG link recovery失败；当终端设备与SN之间的随机接入消息传输次数小于第七门限值，但大于或等于第八门限值时，终端设备认为终端设备与SN之间存在RLF的潜在可能，触发记录第一报告。其中，第八门限值为小于第七门限值；或者，第八门限值为第七门限值与第四系数的乘积，第四系数为小于1的正数，例如第三系数为百分比系数，用于指示第八门限所占第七门限值的比例。
触发条件五、终端设备检测到与MN之间发生RLF，终端设备检测到来自SN的RLC层的指示信息，该指示信息用于指示发生在RLC层的重复传输次数小于第九门限值，且大于或等于第十门限值。
可以理解的是，当RLC层的指示信息指示发生在RLC层的重复传输次数到达第九门限值，则确定终端设备与SN之间发生RLF；当RLC层的指示信息指示发生在RLC层的重复传输次数小于第九门限值，但大于或等于第十门限值时，终端设备认为终端设备与SN之间存在RLF的潜在可能，触发记录第一报告。其中，第十门限值为小于第九门限值；或者，第十门限值为第九门限值与第五系数的乘积，第五系数为小于1的正数，例如第五系数为百分比系数，用于指示第十门限值所占第九门限值的比例。
触发条件六、终端设备检测到与MN之间发生RLF，在SN上执行LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值。
可以理解的是，当在SN上执行LBT的连续失败次数到达第十一门限值，则确定终端设备与SN之间发生RLF；当在SN上执行LBT的连续失败次数小于第十一门限值，但大于或等于第十二门限值时，终端设备认为终端设备与SN之间存在RLF的潜在可能，触发记录第一报告。其中，第十二门限值为小于第十一门限值或者，第十二门限值为第十一门限值与第六系数的乘积，第六系数为小于1的正数，例如第六系数为百分比系数，用于指示第十二门限值所占第十一门限值的比例。
需要说明的是，本申请所提及的门限值(包括第一门限值～第十二门限值)为网络侧预定义的数值，后续可根据具体的应用场景进行相应调整，本申请对此不进行具体限定。
在一个可能的实施方式中，第一报告还包括以下信息中的一种或多种：第二计时器的运行时长、第三计时器的运行时长、终端设备与SN之间的随机接入消息传输次数、在SN无线链路控制层发生的重复传输次数、在SN上执行LBT的连续失败次数。也就是说，当触发本次记录第一报告的触发条件为前述触发 条件一～六中的任一项时，该第一报告还可以包括本次记录第一报告的触发条件的相关信息。例如，触发记录第一报告的触发条件为触发条件二时，该第一报告除了可以包含S703中信息(1)～信息(4)中的一种或多种信息之外，还可以包括第二计时器的运行时长。
S704、终端设备向MN和/或SN发送第一报告。相应地，MN和/或SN接收来自终端设备的第一报告。
可以理解的是，终端设备同时与第一网络设备(即MN)和第二网络设备(即SN)进行通信，在终端设备与MN之间发生RLF的情况下，终端设备执行fast MCG link recovery流程。在fast MCG link recovery成功之后，终端设备通过切换或者小区选择接入到第三网络设备，即第三网络设备作为终端设备当前连接的MN(或理解为该第三网络设备为目标MN，该第一网络设备为源MN)。在这种情况下，终端设备向第三网络设备发送该第一报告；或者在RRC完成消息中向第三网络设备指示第一报告的存在，在终端设备接收到第三网络设备的第一报告的报告请求后，终端设备向该第三网络设备发送该第一报告。进一步地，第三网络设备进行初步分析，将第一报告发送给MN和/或者SN。其中，第三网络设备根据第一报告的触发原因指示信息确定发送给MN和/或SN，当触发条件一满足时，第三网络设备将报告转发给MN，当触发条件二～六中的一个或者多个满足时，第三网络设备将报告转发给SN。进一步地，MN或SN接收该第一报告后，可根据该第一报告对终端设备的移动性参数配置信息进行调整，例如，第一报告指示触发记录本次第一报告的触发条件为前述触发条件二，在这种情况下，SN对终端设备连接SN的配置信息进行优化，从而减少终端设备与SN之间发生RLF的概率，从而提升fast MCG link recovery过程成功的机会，减少MCG传输恢复的时延。
需要说明的是，该第三网络设备可以为该MN(即终端设备执行fast MCG link recovery后连接的小区为与源MCG同站的小区)或除该MN之外的其他网络设备(即终端设备执行fast MCG link recovery后连接的小区为与源MCG不同站的小区)，为了便于描述，本申请中均是以第三网络设备为除该MN之外的其他网络设备为例进行讲解，不应视为对本申请的一个具体限定。
还需要说明的是，在第三网络设备接收到第一报告后，该第一报告可以在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。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该第一报告的网络设备，例如在如下的步骤中，第三网络设备可将第一报告发送给第一网络设备(即前述MN)或者第二网络设备(即前述SN)。
下面，以第三网络设备将第一报告发送给第二网络设备为例，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第二网络设备。
若第三网络设备和第二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(例如X2接口或Xn接口)向第二网络设备发送第一报告的部分或全部信息。可选的，第三网络设备可以通过指示消息(例如失败指示(failure indication)消息或RLF指示(RLF indication)消息)、切换报告(handover report)消息或者其他消息向第二网络设备发送第一报告的部分或全部信息。
若第三网络设备和第二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第二网络设备发送第一报告的部分或全部信息。例如，通过基站和核心网设备间的接口(例如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，由核心网设备向第二网络设备转发从第三网络设备接收到的信息。可选的，第三网络设备可以通过S1或NG接口上的以下消息向第二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。
需要说明的是，第三网络设备将第一报告的部分信息或全部信息发送至第一网络设备亦可参见第三网络设备将第一报告发送至第一网络设备的方式，在此不在说明。可选的，第三网络设备还可以向第二网络设备或第一网络设备发送第一报告的类型信息，例如第三网络设备向第二网络设备或第一网络设备发送指示信息，该指示信息用于指示第一报告的类型为SHR，或者，指示信息用于指示第一报告的类型为fast MCG link recovery成功的报告。
综上所述，通过图7所描述的通信方法，在终端设备进行fast MCG link recovery成功且满足触发条件的情况下，终端设备向网络设备(包括MN和/或SN)上报用于指示fast MCG link recovery过程中的相关信息，从而使得网络设备对有可能导致fast MCG link recovery过程失败的潜在原因进行分析，并根据分析 结果对该终端设备或其他终端设备的fast MCG link recovery的配置信息进行优化，从而减少终端设备与SN之间发生RLF的概率，从而提升fast MCG link recovery过程成功的机会，减少MCG传输恢复的时延。
为了减少终端设备发生MCG RLF的概率，本申请还提供了另一种通信方法，该通信方法的流程示意图可参见图8a所示。
请参见图8a所示，图8a是本申请实施例提供的另一种通信方法的流程示意图。如图8a所示，图8a以终端设备连接的MN和终端设备为执行主体为例进行说明。可以理解，该通信方法执行主体也可以为MN中的芯片和终端设备中的芯片。其中：
S801、在终端设备与MN之间发生RLF时，终端设备通过SN向MN发送MCG failure information，并记录RLF报告。
其中，S801的具体实施方式可参见对前述S603和S604具体实施方式的描述，在此不再赘述。与S603和S604不同的是，S801中的主小区失败信息除了包含前述S603中MCG failure information的信息，还可包括以下信息中的一种或多种：(1)第一小区的信息(即前述failed Pcell ID)，该第一小区为终端设备检测到发生RLF的主小区；(2)第二小区的信息(即前述previous PCell ID)，该第二小区为终端设备接收的最后一次切换命令的源主小区；(3)RLF原因指示信息(即前述rlf-cause)(4)第一时间信息，该第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；(5)第二时间信息(即前述time Since CHO-Reconfig)，该第二时间信息用于指示终端设备接收的最后一次CHO的时刻与RLF的时刻之间的时长；(6)终端设备随机接入MN的信息(ra-Information Common)，可以理解的是若导致MCG RLF的原因是failed Pcell ID对应的PCell小区的随机接入问题或波束失败恢复失败，则该S801中的主小区失败信息包括该终端设备随机接入MN的信息；该终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息；(7)第一指示信息，该第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区(包括信号质量信息)；和/或，第一候选小区的切换触发条件；(8)第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区，即该第二候选小区不为MN为终端设备配置的CHO候选小区。
S802、在发送MCG failure information的时刻之后的第一时间内，终端设备通过SN接收来自MN的第一消息，并释放该RLF报告。
其中，关于第一时间和第一消息的说明可参见S702中对第一时间和第一消息的说明，在此不在过多赘述。也就是说，若在第一时间内(即T316定时器超时之前)终端设备通过SN接收到来自MN的第一消息，则fast MCG link recovery成功，终端设备释放(或理解为删除)该RLF报告。反之，若在第一时间内终端设备未通过SN接收到来自MN的第一消息，则fast MCG link recovery失败，终端设备执行RRC重建，在RRC重建完成后终端设备通过连接的网络设备向该MN发送该RLF报告。
S802的具体实施方式可参见前述对S605～S606具体实施方式的描述，在此不再赘述。
由于MCG failure information是立即上报机制(即MCG RLF发生后，终端设备立即将MCG failure information发送至SN)。因此，通过图8a所示的通信方法，终端设备在检测到MCG RLF并执行fast MCG link recovery成功之后，可以通过增强MCG failure information(包含RLF报告内容的MCG failure information)，向MN指示MCG RLF的失败场景相关信息，以使无论执行fast MCG link recovery流程成功与否、终端设备是否释放RLF报告，MN均可以根据该增强MCG failure information进行MRO。
在一种可能的实施方式中，图8a所示的通信方法可以与图7所示的通信方法结合实施，即图7中S701的MCG failure information的内容包括图8a中S801中描述的MCG failure information的内容。为了更直观地展示，图7和图8a通信方法结合实施过程，请参见图8b所示的通信方法的流程示意图，如图7所示，图7以终端设备连接的MN、SN和终端设备为执行主体为例进行说明。可以理解，该通信方法执行主体也可以为MN中的芯片、SN中的芯片和终端设备中的芯片。其中：
S8001、在终端设备与MN之间发生RLF时，终端设备向SN发送MCG failure information，并记录RLF报告。
其中，S8001的具体实施方式可参见前述S701或S801的具体实施方式，关于该MCG failure information的说明可参见S801中对MCG failure information的说明。
S8002、SN向MN发送该MCG failure information。
S8003、MN向SN发送第一消息。
其中，关于第一消息的说明可参见S702或S802中对第一消息的说明。
S8004、在发送MCG failure information的时刻之后的第一时间内，终端设备接收到SN发送的第一消息，则终端设备释放该RLF报告。
其中，关于第一时间的说明，可参见S702或S802中对第一时间的说明。关于S8004的具体实施方式可参见前述对S802具体实施方式的描述。
S8005、在满足触发条件的情况下，终端设备记录第一报告，该第一报告用于指示执行fast MCG link recovery过程中的相关信息。
其中，关于S8005的具体实施方式可参加对前述S703具体实施方式的描述。
S8006、终端设备向第三网络设备发送第一报告。
其中，关于第三网络设备的说明可参见S704中对第三网络设备的说明。
S8007、第三网络设备向MN和/或SN发送第一报告。
其中，S8007的具体实施方式可参见前述S704中对第三网络设备将第一报告发送给第二网络设备部分的说明。
为了实现上述本申请实施例提供的方法中的各功能，终端设备、MN和SN可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
如图9所示，本申请实施例提供了一种通信装置900。该通信装置900可以是终端设备的部件(例如，集成电路，芯片等等)，也可以是MN的部件(例如，集成电路，芯片等等)，也可以是SN的部件(例如，集成电路，芯片等等)。该通信装置900也可以是其他通信单元，用于实现本申请方法实施例中的方法。该通信装置900可以包括：通信单元901、处理单元902和存储单元903。
在一种可能的设计中，如图9中的一个或者多个单元可能由一个或者多个处理器来实现，或者由一个或者多个处理器和存储器来实现；或者由一个或多个处理器和收发器实现；或者由一个或者多个处理器、存储器和收发器实现，本申请实施例对此不作限定。所述处理器、存储器、收发器可以单独设置，也可以集成。
所述通信装置900具备实现本申请实施例描述的终端设备或MN或SN的功能。比如，所述通信装置900包括发送端执行本申请实施例描述的终端设备或MN或SN涉及步骤所对应的模块或单元或手段(means)，所述功能或单元或手段(means)可以通过软件实现，或者通过硬件实现，也可以通过硬件执行相应的软件实现，还可以通过软件和硬件结合的方式实现。详细可进一步参考前述对应方法实施例中的相应描述。
在一种可能的设计中，一种通信装置900可包括：存储单元903和通信单元901；
通信单元901，用于在终端设备与MN之间发生RLF时，通过SN向MN发送MCG failure information；其中，该MCG failure information用于请求执行fast MCG link recovery；在发送MCG failure information的时刻之后的第一时间内，通信单元901还用于通过SN接收到来自MN的第一消息；其中，该第一消息包括切换消息或RRC释放消息；在满足触发条件的情况下，存储单元903，用于记录第一报告；其中，该第一报告用于指示执行fast MCG link recovery过程中的相关信息；进一步地，通信单元901还用于向MN发送该第一报告。
一种可选的实施方式中，通信单元901还用于接收来自MN的配置消息，该配置消息用于配置在fast MCG link recovery成功且满足触发条件的情况下记录该第一报告；其中，该配置消息包括触发条件。
一种可选的实施方式中，第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、第一报告的触发条件指示信息、SCG的测量信息、终端设备随机接入SN的信息；其中，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长。
一种可选的实施方式中，终端设备随机接入SN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的PUSCH配置信息的一项或者多项。
一种可选的实施方式中，触发条件包括以下项中的一种或多种：
第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长；其中，第二门限值为第一门限值与第一系数的乘积，第一系数为小于1的正数；或者，第二门限值为小于第一门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；第二计时器的运行时长为：终端设备检测到与SN有物理层失步问题到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第四门限值为第三门限值与第二系数的乘积，第二系数为小于1的正数；或者，第四门限值为小于第三门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为：第二计时器运行期间，终端设备触发测量报告到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第六门限值为第五门限值与第三系数的乘积，第三系数为小于1的正数；或者，第六门限值为小于第五门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且终端设备与SN之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；其中，第八门限值为第七门限值与第四系数的乘积，第四系数为小于1的正数；或者，第八门限值为小于第七门限值；
或者，终端设备检测到与MN之间发生RLF，终端设备检测到来自SN的无线链路控制层的指示信息，指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；其中，第十门限值为第九门限值与第五系数的乘积，第五系数为小于1的正数；或者，第十门限值为小于第九门限值；
或者，终端设备检测到与MN之间发生RLF，在SN上执行上行LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值；其中，第十二门限值为第十一门限值与第六系数的乘积，第六系数为小于1的正数；或者，第十二门限值为小于第十一门限值。
一种可选的实施方式中，第一报告还包括以下信息中的一种或多种：第二计时器的运行时长、第三计时器的运行时长、终端设备与SN之间的随机接入消息传输次数、在SN无线链路控制层发生的重复传输次数、在SN上执行LBT的连续失败次数。
一种可选的实施方式中，在终端设备与MN之间发生RLF时，存储单元903还用于记录RLF报告；若在发送MCG failure information的时刻之后的第一时间内，通信单元901还用于通过SN接收到来自MN的第一消息，则存储单元903还用于释放RLF报告。
一种可选的实施方式中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
关于上述通信单元901和存储单元903更详细的描述，可参考图7或图8b方法实施例中终端设备的相关描述，在此不再说明。
在一种可能的设计中，一种通信装置900可包括：通信单元901；
通信单元901，用于通过SN接收来自终端设备的MCG failure information；其中，MCG failure information用于请求执行fast MCG link recovery；
通信单元901，还用于通过SN向终端设备发送第一消息；其中，第一消息包括切换消息或RRC释放消息；
通信单元901，还用于在终端设备满足触发条件的情况下，接收来自终端设备的第一报告，该第一报 告用于指示执行fast MCG link recovery过程中的相关信息。
一种可选的实施方式中，通信单元901，还用于向终端设备发送配置消息，该配置消息用于配置在fast MCG link recovery成功且满足触发条件的情况下记录第一报告；其中，配置消息包括触发条件。
一种可选的实施方式中，第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、第一报告的触发条件指示信息、SCG的测量信息、终端设备随机接入SN的信息；其中，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长。
一种可选的实施方式中，终端设备随机接入SN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的PUSCH配置信息的一项或者多项。
一种可选的实施方式中，触发条件包括以下项中的一种或多种：第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长；其中，第二门限值为第一门限值与第一系数的乘积，第一系数为小于1的正数；或者，第二门限值为小于第一门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；第二计时器的运行时长为：终端设备检测到与SN有物理层失步问题到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第四门限值为第三门限值与第二系数的乘积，第二系数为小于1的正数；或者，第四门限值为小于第三门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为：第二计时器运行期间，终端设备触发测量报告到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第六门限值为第五门限值与第三系数的乘积，第三系数为小于1的正数；或者，第六门限值为小于第五门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且终端设备与SN之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；其中，第八门限值为第七门限值与第四系数的乘积，第四系数为小于1的正数；或者，第八门限值为小于第七门限值；
或者，终端设备检测到与MN之间发生RLF，终端设备检测到来自SN的无线链路控制层的指示信息，指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；其中，第十门限值为第九门限值与第五系数的乘积，第五系数为小于1的正数；或者，第十门限值为小于第九门限值；
或者，终端设备检测到与MN之间发生RLF，在SN上执行上行LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值；其中，第十二门限值为第十一门限值与第六系数的乘积，第六系数为小于1的正数；或者，第十二门限值为小于第十一门限值。
一种可选的实施方式中，第一报告还包括以下信息中的一种或多种：第二计时器的运行时长、第三计时器的运行时长、终端设备与SN之间的随机接入消息传输次数、在SN无线链路控制层发生的重复传输次数、在SN上执行LBT的连续失败次数。
一种可选的实施方式中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
关于上述通信单元901更详细的描述，可参考图7或图8b方法实施例中MN的相关描述，在此不再说明。
在一种可能的设计中，一种通信装置900可包括：通信单元901；其中：
通信单元901，用于在终端设备与MN之间发生RLF时，接收来自终端设备的MCG failure information；其中，该MCG failure information用于请求执行fast MCG link recovery；该通信单元901，还用于向MN发送该MCG failure information；该通信单元901，还用于接收来自MN的第一消息；其中，该第一消息包括切换消息或RRC释放消息；该通信单元901，还用于向终端设备发送该第一消息；在终端设备满足触发条件的情况下，该通信单元901还用于，接收来自终端设备的第一报告，该第一报告用于指示执行fast MCG link recovery过程中的相关信息。
一种可选的实施方式中，第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、第一报告的触发条件指示信息、SCG的测量信息、终端设备随机接入SN的信息；其中，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长。
一种可选的实施方式中，终端设备随机接入SN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的PUSCH配置信息的一项或者多项。
一种可选的实施方式中，触发条件包括以下项中的一种或多种：第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备发送MCG failure information到终端设备接收第一消息的时刻之间的时长；其中，第二门限值为第一门限值与第一系数的乘积，第一系数为小于1的正数；或者，第二门限值为小于第一门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；第二计时器的运行时长为：终端设备检测到与SN有物理层失步问题到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第四门限值为第三门限值与第二系数的乘积，第二系数为小于1的正数；或者，第四门限值为小于第三门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且与SN对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为：第二计时器运行期间，终端设备触发测量报告到终端设备检测到与SN之间无线链路恢复之间的时长；其中，第六门限值为第五门限值与第三系数的乘积，第三系数为小于1的正数；或者，第六门限值为小于第五门限值的数值；
或者，终端设备检测到与MN之间发生RLF，且终端设备与SN之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；其中，第八门限值为第七门限值与第四系数的乘积，第四系数为小于1的正数；或者，第八门限值为小于第七门限值；
或者，终端设备检测到与MN之间发生RLF，终端设备检测到来自SN的无线链路控制层的指示信息，指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；其中，第十门限值为第九门限值与第五系数的乘积，第五系数为小于1的正数；或者，第十门限值为小于第九门限值；
或者，终端设备检测到与MN之间发生RLF，在SN上执行上行LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值；其中，第十二门限值为第十一门限值与第六系数的乘积，第六系数为小于1的正数；或者，第十二门限值为小于第十一门限值。
一种可选的实施方式中，第一报告还包括以下信息中的一种或多种：第二计时器的运行时长、第三计时器的运行时长、终端设备与SN之间的随机接入消息传输次数、在SN无线链路控制层发生的重复传输次数、在SN上执行LBT的连续失败次数。
一种可选的实施方式中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区 标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
关于上述通信单元901更详细的描述，可参考图7或图8b方法实施例中SN的相关描述，在此不再说明。
在一种可能的设计中，一种通信装置900可包括：存储单元903、处理单元902和通信单元901；
处理单元902，用于在终端设备与MN之间发生RLF时，确定MCG failure information；
通信单元901，用于通过SN向MN发送该MCG failure information；其中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
一种可选的实施方式中，终端设备在与MN之间发生RLF时，存储单元903，用于记录RLF报告；若在发送MCG failure information的时刻之后的第一时间内，通过SN接收到来自MN的第一消息，则存储单元903，还用于释放RFL报告；其中，第一消息包括切换消息或RRC释放消息。
关于上述通信单元901、处理单元902和存储单元903更详细的描述，可参考图8a或图8b方法实施例中终端设备的相关描述，在此不再说明。
在一种可能的设计中，一种通信装置900可包括：通信单元901；
通信单元901，用于在终端设备与MN之间发生RLF时，通过SN接收来自终端设备的MCG failure information；其中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
关于上述通信单元901更详细的描述，可参考图8a或图8b所示方法实施例中MN的相关描述，在此不再说明。
在一种可能的设计中，一种通信装置900可包括：通信单元901；
通信单元901，用于在终端设备与MN之间发生RLF时，接收来自终端设备的MCG failure information；并向MN发送该MCG failure information；其中，MCG failure information包括以下信息中的一种或多种：第一小区的信息，第一小区为终端设备检测到发生RLF的主小区；第二小区的信息，第二小区为终端设备接收的最后一次切换命令的源主小区；RLF失败的原因指示信息；第一时间信息，第一时间信息用于指示终端设备接收的最后一次切换命令的时刻与RLF的时刻之间的时长；第二时间信息，该第二时间信息用于 指示终端设备接收的最后一次CHO命令的时刻与RLF的时间之间的时长；终端设备随机接入MN的信息；第一指示信息，第一指示信息用于指示截止到RLF时，终端设备测量到的MN为终端设备配置的CHO的第一候选小区；和/或，第一候选小区的切换触发条件；第二指示信息，该第二指示信息用于指示终端设备测量到的除第一候选小区外的第二候选小区。
一种可选的实施方式中，终端设备随机接入MN的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的PUSCH配置信息。
关于上述通信单元901更详细的描述，可参考图8a或图8b所示方法实施例中SN的相关描述，在此不再说明。
本申请实施例还提供一种通信装置1000，图10为通信装置1000的结构示意图。所述通信装置1000可以是终端设备，也可以是支持终端设备实现上述方法的芯片、芯片系统、或处理器等。所述通信装置1000还可以是MN，也可以是支持MN实现上述方法的芯片、芯片系统、或处理器等。所述通信装置1000还可以是SN，也可以是支持SN实现上述方法的芯片、芯片系统、或处理器等。该装置可用于实现上述方法实施例中描述的方法，具体可以参见上述方法实施例中的说明。
所述通信装置1000可以包括一个或多个处理器1001。所述处理器1001可以是通用处理器或者专用处理器等。例如可以是基带处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或中央处理器(central processing unit，CPU)。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、基带芯片，终端、终端芯片，分布单元(distributed unit，DU)或集中单元(centralized unit，CU)等)进行控制，执行软件程序，处理软件程序的数据。
可选的，所述通信装置1000中可以包括一个或多个存储器1002，其上可以存有指令1004，所述指令可在所述处理器1001上被运行，使得所述通信装置1000执行上述方法实施例中描述的方法。可选的，所述存储器1002中还可以存储有数据。所述处理器1001和存储器1002可以单独设置，也可以集成在一起。
存储器1002可包括但不限于硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等非易失性存储器，随机存储记忆体(Random Access Memory，RAM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、ROM或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)等等。
可选的，所述通信装置1000还可以包括收发器1005、天线1006。所述收发器1005可以称为收发单元、收发机、或收发电路等，用于实现收发功能。收发器1005可以包括接收器和发送器，接收器可以称为接收机或接收电路等，用于实现接收功能；发送器可以称为发送机或发送电路等，用于实现发送功能。
所述通信装置1000为终端设备，该通信装置1000用于执行上述图7、图8a或图8b所示通信方法中终端设备执行的步骤。
所述通信装置1000为MN，该通信装置1000用于执行上述图7、图8a或图8b所示通信方法中MN执行的步骤。
所述通信装置1000为SN，该通信装置1000用于执行上述图7、图8a或图8b所示通信方法中SN执行的步骤。
另一种可能的设计中，处理器1001中可以包括用于实现接收和发送功能的收发器。例如该收发器可以是收发电路，或者是接口，或者是接口电路。用于实现接收和发送功能的收发电路、接口或接口电路可以是分开的，也可以集成在一起。上述收发电路、接口或接口电路可以用于代码/数据的读写，或者，上述收发电路、接口或接口电路可以用于信号的传输或传递。
又一种可能的设计中，可选的，处理器1001可以存有指令1003，指令1003在处理器1001上运行，可使得所述通信装置1000执行上述方法实施例中描述的方法。指令1003可能固化在处理器1001中，该种情况下，处理器1001可能由硬件实现。
又一种可能的设计中，通信装置1000可以包括电路，所述电路可以实现前述方法实施例中发送或接收或者通信的功能。本申请实施例中描述的处理器和收发器可实现在集成电路(integrated circuit，IC)、模拟IC、射频集成电路(radio frequency integrated circuit，RFIC)、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)、印刷电路板(printed circuit board，PCB)、电子设备等上。该处理器和 收发器也可以用各种IC工艺技术来制造，例如互补金属氧化物半导体(complementary metal oxide semiconductor，CMOS)、N型金属氧化物半导体(nMetal-oxide-semiconductor，NMOS)、P型金属氧化物半导体(positive channel metal oxide semiconductor，PMOS)、双极结型晶体管(Bipolar Junction Transistor，BJT)、双极CMOS(BiCMOS)、硅锗(SiGe)、砷化镓(GaAs)等。
本申请实施例中描述的通信装置的范围并不限于此，而且通信装置的结构可以不受图10的限制。通信装置可以是独立的设备或者可以是较大设备的一部分。例如所述通信装置可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或子系统；
(2)具有一个或多个IC的集合，可选的，该IC集合也可以包括用于存储数据，指令的存储部件；
(3)ASIC，例如调制解调器(modulator)；
(4)可嵌入在其他设备内的模块；
本申请实施例中通信装置、芯片还可执行上述通信装置1000所述的实现方式。本领域技术人员还可以了解到本申请实施例列出的各种说明性逻辑块(illustrative logical block)和步骤(step)可以通过电子硬件、电脑软件，或两者的结合进行实现。这样的功能是通过硬件还是软件来实现取决于特定的应用和整个系统的设计要求。本领域技术人员可以对于每种特定的应用，可以使用各种方法实现所述的功能，但这种实现不应被理解为超出本申请实施例保护的范围。
本申请实施例和上述通信方法所示方法实施例基于同一构思，其带来的技术效果也相同，具体原理请参照上述通信方法所示实施例的描述，不再赘述。
本申请还提供了一种计算机可读存储介质，用于储存计算机软件指令，当所述指令被通信装置执行时，实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，用于储存计算机软件指令，当所述指令被通信装置执行时，实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序，当其在计算机上运行时，实现上述任一方法实施例的功能。
本申请还提供了一种通信系统，该系统包括一个或多个网络设备，该系统还可以包括一个或多个终端设备。在另一种可能的设计中，该系统还可以包括本申请提供的方案中与网络设备、终端设备进行交互的其他设备。
上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，SSD)等。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (23)

  1. 一种通信方法，其特征在于，所述方法包括：
    在终端设备与主节点之间发生无线链路失败时，通过辅节点向所述主节点发送主小区组失败信息；其中，所述主小区组失败信息用于请求执行快速主小区组链路恢复；
    在发送所述主小区组失败信息的时刻之后的第一时间内，通过所述辅节点接收到来自所述主节点的第一消息；其中，所述第一消息包括切换消息或无线资源控制释放消息；
    在满足触发条件的情况下，记录第一报告；所述第一报告用于指示执行快速主小区组链路恢复过程中的相关信息；
    向所述主节点和/或所述辅节点发送所述第一报告。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    接收来自所述主节点的配置消息，所述配置消息用于配置在快速主小区组链路恢复成功且满足所述触发条件的情况下记录所述第一报告；其中，所述配置消息包括所述触发条件。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、所述第一报告的触发条件指示信息、辅小区组的测量信息、终端设备随机接入所述辅节点的信息；
    其中，所述第一计时器的运行时长为终端设备发送所述主小区组失败信息到所述终端设备接收所述第一消息的时刻之间的时长。
  4. 根据权利要求3所述的方法，其特征在于，所述终端设备随机接入所述辅节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的物理上行共享信道配置信息的一项或者多项。
  5. 根据权利要求1-4中任一项所述方法，其特征在于，所述触发条件包括以下项中的一种或多种：
    第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，所述第一计时器的运行时长为所述终端设备发送主小区组失败信息到所述终端设备接收所述第一消息的时刻之间的时长；
    其中，所述第二门限值为所述第一门限值与第一系数的乘积，所述第一系数为小于1的正数；或者，所述第二门限值为小于所述第一门限值的数值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，且与所述辅节点对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；所述第二计时器的运行时长为：所述终端设备检测到与辅节点有物理层失步问题到所述终端设备检测到与辅节点之间无线链路恢复之间的时长；
    其中，所述第四门限值为所述第三门限值与第二系数的乘积，所述第二系数为小于1的正数；或者，所述第四门限值为小于所述第三门限值的数值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，且与所述辅节点对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，所述第三计时器的运行时长为：所述第二计时器运行期间，所述终端设备触发测量报告到所述终端设备检测到与辅节点之间无线链路恢复之间的时长；
    其中，所述第六门限值为所述第五门限值与第三系数的乘积，所述第三系数为小于1的正数；或者，所述第六门限值为小于所述第五门限值的数值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，且所述终端设备与所述辅节点之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；
    其中，所述第八门限值为所述第七门限值与第四系数的乘积，所述第四系数为小于1的正数；或者，所述第八门限值为小于所述第七门限值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，所述终端设备检测到来自所述辅节点的无线链路控制层的指示信息，所述指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；
    其中，所述第十门限值为所述第九门限值与第五系数的乘积，所述第五系数为小于1的正数；或者，所述第十门限值为小于所述第九门限值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，在所述辅节点上执行上行先听后说LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值；
    其中，所述第十二门限值为所述第十一门限值与第六系数的乘积，所述第六系数为小于1的正数；或者，所述第十二门限值为小于所述第十一门限值。
  6. 根据权利要求5所述方法，其特征在于，所述第一报告还包括以下信息中的一种或多种：所述第二计时器的运行时长、所述第三计时器的运行时长、所述终端设备与所述辅节点之间的随机接入消息传输次数、在所述辅节点无线链路控制层发生的重复传输次数、在所述辅节点上执行LBT的连续失败次数。
  7. 根据权利要求1-6中任一项所述方法，其特征在于，所述方法还包括：
    在终端设备与主节点之间发生无线链路失败时，记录无线链路失败RLF报告；
    若在发送所述主小区组失败信息的时刻之后的第一时间内，通过所述辅节点接收到来自所述主节点的第一消息，则释放所述RLF报告。
  8. 根据权利要求7所述方法，其特征在于，所述主小区组失败信息包括以下信息中的一种或多种：
    第一小区的信息，所述第一小区为终端设备检测到发生无线链路失败的主小区；
    第二小区的信息，所述第二小区为所述终端设备接收的最后一次切换命令的源主小区；
    无线链路失败原因指示信息；
    第一时间信息，所述第一时间信息用于指示所述终端设备接收的最后一次切换命令的时刻与所述无线链路失败的时刻之间的时长；
    第二时间信息，所述第二时间信息用于指示所述终端设备接收的最后一次条件切换命令的时刻与所述无线链路失败的时刻之间的时长；
    终端设备随机接入所述主节点的信息；
    第一指示信息，所述第一指示信息用于指示截止到所述无线链路失败时，所述终端设备测量到的所述主节点为所述终端设备配置的条件切换的第一候选小区；和/或，所述第一候选小区的切换触发条件；
    第二指示信息，所述第二指示信息用于指示终端设备测量到的除所述第一候选小区外的第二候选小区。
  9. 根据权利要求8所述方法，其特征在于，所述终端设备随机接入所述主节点的信息包括以下项中的一种或多种：
    随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的物理上行共享信道PUSCH配置信息。
  10. 一种通信方法，其特征在于，所述方法包括：
    通过辅节点接收来自终端设备的主小区组失败信息；其中，所述主小区组失败信息用于请求执行快速主小区组链路恢复；
    通过所述辅节点向所述终端设备发送第一消息；其中，所述第一消息包括切换消息或无线资源控制释放消息；
    在所述终端设备满足触发条件的情况下，接收来自所述终端设备的第一报告，所述第一报告用于指示执行快速主小区组链路恢复过程中的相关信息。
  11. 根据权利要求10所述方法，其特征在于，所述方法还包括：
    向所述终端设备发送配置消息，所述配置消息用于配置在快速主小区组链路恢复成功且满足触发条件的情况下记录所述第一报告；其中，所述配置消息包括所述触发条件。
  12. 根据权利要求10或11所述方法，其特征在于，所述第一报告包括以下信息中的一种或多种：第一计时器的运行时长、主辅小区的标识信息、所述第一报告的触发条件指示信息、辅小区组的测量信息、终端设备随机接入所述辅节点的信息；
    其中，所述第一计时器的运行时长为终端设备发送所述主小区组失败信息到所述终端设备接收所述第 一消息的时刻之间的时长。
  13. 根据权利要求12所述方法，其特征在于，终端设备随机接入所述辅节点的信息包括以下项中的一种或多种：随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量、以及两步随机接入的物理上行共享信道PUSCH配置信息的一项或者多项。
  14. 根据权利要求10-13中任一项所述方法，其特征在于，所述触发条件包括以下项中的一种或多种：
    第一计时器的运行时长小于第一门限值，且大于或等于第二门限值，所述第一计时器的运行时长为所述终端设备发送主小区组失败信息到所述终端设备接收所述第一消息的时刻之间的时长；
    其中，所述第二门限值为所述第一门限值与第一系数的乘积，所述第一系数为小于1的正数；或者，所述第二门限值为小于所述第一门限值的数值；
    或者，所述终端设备检测到与主节点之间发生无线链路失败，且与所述辅节点对应的第二计时器的运行时长小于第三门限值，且大于或等于第四门限值；所述第二计时器的运行时长为：所述终端设备检测到与辅节点有物理层失步问题到所述终端设备检测到与辅节点之间无线链路恢复之间的时长；
    其中，所述第四门限值为所述第三门限值与第二系数的乘积，所述第二系数为小于1的正数；或者，所述第四门限值为小于所述第三门限值的数值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，且与所述辅节点对应的第三计时器的运行时长小于第五门限值，且大于或等于第六门限值，所述第三计时器的运行时长为：所述第二计时器运行期间，所述终端设备触发测量报告到所述终端设备检测到与辅节点之间无线链路恢复之间的时长；
    其中，所述第六门限值为所述第五门限值与第三系数的乘积，所述第三系数为小于1的正数；或者，所述第六门限值为小于所述第五门限值的数值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，且所述终端设备与所述辅节点之间的随机接入消息传输次数小于第七门限值，且大于或等于第八门限值；
    其中，所述第八门限值为所述第七门限值与第四系数的乘积，所述第四系数为小于1的正数；或者，所述第八门限值为小于所述第七门限值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，所述终端设备检测到来自所述辅节点的无线链路控制层的指示信息，所述指示信息用于指示发生在无线链路控制层的重复传输次数小于第九门限值，且大于或等于第十门限值；
    其中，所述第十门限值为所述第九门限值与第五系数的乘积，所述第五系数为小于1的正数；或者，所述第十门限值为小于所述第九门限值；
    或者，所述终端设备检测到与所述主节点之间发生无线链路失败，在所述辅节点上执行上行先听后说LBT的连续失败次数小于第十一门限值，且大于或等于第十二门限值；
    其中，所述第十二门限值为所述第十一门限值与第六系数的乘积，所述第六系数为小于1的正数；或者，所述第十二门限值为小于所述第十一门限值。
  15. 根据权利要求14所述方法，其特征在于，所述第一报告还包括以下信息中的一种或多种：所述第二计时器的运行时长、所述第三计时器的运行时长、所述终端设备与所述辅节点之间的随机接入消息传输次数、在所述辅节点无线链路控制层发生的重复传输次数、在所述辅节点上执行LBT的连续失败次数。
  16. 根据权利要求10-15中任一项所述方法，其特征在于，所述主小区组失败信息包括以下信息中的一种或多种：
    第一小区的信息，所述第一小区为终端设备检测到发生无线链路失败的主小区；
    第二小区的信息，所述第二小区为所述终端设备接收的最后一次切换命令的源主小区；
    无线链路失败的原因指示信息；
    第一时间信息，所述第一时间信息用于指示所述终端设备接收的最后一次切换命令的时刻与所述无线链路失败的时刻之间的时长；
    第二时间信息，所述第二时间信息用于指示所述终端设备接收的最后一次条件切换命令的时刻与所述无线链路失败的时刻之间的时长；
    终端设备随机接入所述主节点的信息；
    第一指示信息，所述第一指示信息用于指示截止到所述无线链路失败时，所述终端设备测量到的所述主节点为所述终端设备配置的条件切换的第一候选小区；和/或，所述第一候选小区的切换触发条件；
    第二指示信息，所述第二指示信息用于指示终端设备测量到的除所述第一候选小区外的第二候选小区。
  17. 根据权利要求16所述方法，其特征在于，所述终端设备随机接入所述主节点的信息包括以下项中的一种或多种：
    随机接入的小区标识信息、随机接入的频点信息、时频域配置信息、信号质量测量信息、信号质量测量信息满足质量门限的指示信息、进行随机接入尝试的波束信息、两步随机接入待传输数据量或两步随机接入的物理上行共享信道PUSCH配置信息。
  18. 一种通信装置，其特征在于，包括：用于执行如权利要求1～9中任一项所述方法的模块或单元；或者，包括用于执行如权利要求10-17中任一项所述方法的模块或单元。
  19. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1-9或者10-17中任一项所述的方法。
  20. 一种通信系统，其特征在于，包括所述通信系统包括主节点和辅节点，其中，所述主节点用于执行如权利要求10-17中任一项所述方法。
  21. 根据权利要求20所述的通信系统，其特征在于，所述通信系统还包括终端设备，所述终端设备用于执行如权利要求1-9中任一项所述的方法。
  22. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1-9或者10-17中任一项所述的方法。
  23. 一种计算机程序产品，其特征在于，当计算机读取并执行所述计算机程序产品时，使得计算机执行权利要求1-9或者10-17中任一项所述的方法。
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