WO2023283803A1 - Procédé de communication et appareil de communication - Google Patents

Procédé de communication et appareil de communication Download PDF

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Publication number
WO2023283803A1
WO2023283803A1 PCT/CN2021/105983 CN2021105983W WO2023283803A1 WO 2023283803 A1 WO2023283803 A1 WO 2023283803A1 CN 2021105983 W CN2021105983 W CN 2021105983W WO 2023283803 A1 WO2023283803 A1 WO 2023283803A1
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WIPO (PCT)
Prior art keywords
signal quality
sending
configuration information
complete message
reconfiguration complete
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PCT/CN2021/105983
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English (en)
Chinese (zh)
Inventor
张亮亮
戴振华
常俊仁
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2021/105983 priority Critical patent/WO2023283803A1/fr
Priority to CN202180083759.9A priority patent/CN116636256A/zh
Publication of WO2023283803A1 publication Critical patent/WO2023283803A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present application relates to the communication field, and more specifically, to a communication method and a communication device.
  • the terminal device In the dual active protocol stack (DAPS) handover process, after the terminal device successfully accesses the target cell, it sends a radio resource control (RRC) reconfiguration complete message to the target base station.
  • RRC radio resource control
  • the RRC reconfiguration complete message sent by the terminal device performing DAPS handover to the target base station is used to indicate the completion of the handover, that is, to confirm that the terminal device is successfully handed over to the target cell.
  • the radio resource control (radio resource control, RRC) reconfiguration completion message is an acknowledgment mode (acknowledgment mode, AM), with automatic repeat request (automatic repeat reQuest, ARQ) guarantee. If the terminal equipment does not receive the acknowledgment (acknowledgment, ACK) signaling from the target base station after sending the RRC reconfiguration complete message, or receives the negative acknowledgment (negative acknowledgment, NACK) signaling sent by the target base station, then the terminal equipment determines Failed to send the RRC reconfiguration complete message. However, in the case that the RRC reconfiguration completion message fails to be sent, how to restore the communication of the terminal device performing the DAPS handover is an urgent technical problem to be solved.
  • the present application provides a communication method, so that when a terminal device performing DAPS handover successfully accesses a target cell but fails to send an RRC reconfiguration complete message, the terminal device can resume communication.
  • a communication method is provided, the method is applied to a terminal device, and the method includes: during the process of performing DAPS handover, the random access in the target cell is successful; sending RRC reconfiguration to the network device to which the target cell belongs Complete the message; determine that sending the RRC reconfiguration complete message fails; fall back to the source cell for communication, or perform RRC connection re-establishment.
  • the terminal device that performs DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, the terminal device falls back to the source cell for communication, or performs RRC connection re-establishment, so that it can recover communication.
  • the method further includes: releasing the first configuration information, where the first configuration information is the configuration used in the target cell information.
  • the memory consumption of the terminal device can be saved by releasing the configuration information of the target cell.
  • the method further includes: sending indication information to a network device to which the source cell belongs, where the indication information is used to indicate the receiving failure to enter the target cell, or failure to send the RRC reconfiguration complete message.
  • the RRC connection re-establishment includes: performing RRC connection re-establishment according to the first configuration information, or performing RRC connection re-establishment according to the second configuration information; the The first configuration information is configuration information used in the target cell, and the second configuration information is configuration information used in the source cell.
  • the terminal device performing DAPS handover successfully accesses the target cell, if it is determined that the sending of the RRC reconfiguration complete message fails, it can initiate RRC connection re-establishment according to the configuration information of the source cell, or according to the configuration information of the target cell
  • the message initiates RRC connection re-establishment, which is beneficial for the terminal equipment to select a high-quality cell, thereby helping to ensure the service continuity of the terminal equipment.
  • the RRC connection re-establishment according to the first configuration information includes:
  • the RRC connection re-establishment according to the second configuration information includes:
  • determining the first cell releasing the first configuration information; determining an RRC re-establishment request message according to the first configuration information; sending the RRC re-establishment request message to a network device to which the first cell belongs.
  • the fallback to the source cell for communication, or RRC connection re-establishment includes: radio link detection (resource link monitor, RLM) in the source cell During the process, if the timer does not expire, fall back to the source cell for communication; or, according to the signal quality of the cell, fall back to the source cell for communication, or perform RRC connection re-establishment.
  • radio link detection resource link monitor, RLM
  • the fallback to the source cell for communication or RRC connection re-establishment according to the signal quality of the cell includes:
  • the first configuration information is in The configuration information used by the target cell
  • the second configuration information is the configuration information used in the source cell
  • the target cell fall back to the source cell for communication, or use the first configuration information to perform RRC connection re-establishment, or use the second configuration information to perform RRC connection re-establishment; or,
  • the signal quality of the source cell and the signal quality of the target cell fall back to the source cell for communication, or use the first configuration information to perform RRC connection re-establishment, or use the second configuration information to perform RRC connection re-establishment Establish.
  • the terminal device performing DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, it can choose a way to resume communication according to the signal quality of the source cell and/or the signal quality of the target cell , which is beneficial for the terminal equipment to select a high-quality cell, thereby helping to ensure the continuity of the service of the terminal equipment.
  • the first aspect fall back to the source cell for communication according to the signal quality of the source cell, or use the first configuration information to perform RRC connection re-establishment, or use The second configuration information performs RRC re-establishment, including:
  • the signal quality of the source cell meets the following conditions: the signal quality of the source cell is greater than or equal to the seventh threshold and less than or equal to the eighth threshold; or, the signal quality of the source cell is greater than or equal to the first threshold limit, fall back to the source cell for communication; or,
  • the signal quality of the source cell meets the following conditions: the signal quality of the source cell is greater than or equal to the ninth threshold and less than or equal to the tenth threshold; or, the signal quality of the source cell is greater than or equal to the fifth threshold limit, then use the second configuration information to re-establish the RRC connection; or,
  • the signal quality of the source cell satisfies the following condition: the signal quality of the source cell is less than or equal to a third threshold value, the first configuration information is used to re-establish the RRC connection.
  • the first aspect fall back to the source cell for communication according to the signal quality of the target cell, or use the first configuration information to perform RRC connection re-establishment, or, Use the second configuration information to re-establish the RRC connection, including:
  • the signal quality of the target cell meets the following conditions: the signal quality of the target cell is greater than or equal to the eleventh threshold and less than or equal to the twelfth threshold; or, the signal quality of the target cell is less than or equal to second threshold value, fall back to the source cell for communication;
  • the signal quality of the target cell satisfies the following condition: the signal quality of the target cell is less than or equal to the sixth threshold value, then use the second configuration information to perform RRC connection re-establishment;
  • the first configuration information is used to re-establish the RRC connection.
  • the first aspect fall back to the source cell for communication according to the signal quality of the source cell and the signal quality of the target cell, or use the first configuration information to perform communication.
  • Re-establishing the RRC connection, or using the second configuration information to re-establish the RRC connection including:
  • the signal quality of the source cell and the signal quality of the target cell meet the following conditions: the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the signal quality of the source cell minus the signal quality of the target cell The difference is greater than or equal to the fifteenth threshold and less than or equal to the sixteenth threshold; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to The seventeenth threshold value; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the target cell is less than or equal to the eighteenth threshold value, fall back to the source cell for communication;
  • the signal quality of the source cell and the signal quality of the target cell meet the following conditions: the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the signal quality of the source cell minus the signal quality of the target cell
  • the signal quality difference is greater than or equal to the nineteenth threshold and less than or equal to the twentieth threshold; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to the twenty-first threshold; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the target cell is less than or equal to the twenty-second threshold
  • the second configuration is used Information for RRC connection re-establishment
  • the signal quality of the target cell and the signal quality of the target cell meet the following conditions: the signal quality of the target cell is greater than the signal quality of the source cell, and/or, the signal quality of the target cell minus the signal quality of the source cell The difference in signal quality is greater than or equal to the twenty-third threshold and less than or equal to the twenty-fourth threshold; or, the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the target cell The quality is greater than or equal to the twenty-fifth threshold value; or, the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the source cell is less than or equal to the twenty-sixth threshold value, then the first A configuration information for RRC connection re-establishment.
  • the method further includes: stopping the timer T304, and maintaining the RLM of the source cell.
  • the method further includes: stopping the RLM of the source cell.
  • the method further includes: stopping the timer T304 and stopping the RLM of the source cell.
  • the method further includes: maintaining the timer T304 and the RLM of the source cell.
  • the method further includes: stopping the timer T304 and the RLM of the source cell.
  • a communication method is provided, the method is applied to a terminal device, and the method includes: during the process of performing DAPS handover, the random access in the target cell is successful; sending RRC reconfiguration complete to the network device to which the target cell belongs message; when it is determined that sending the RRC reconfiguration complete message fails, send indication information to the network device to which the source cell belongs, where the indication information is used to indicate failure to access the target cell.
  • the terminal device After the terminal device performing DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, the terminal device sends indication information to the network device to which the source cell belongs, and falls back to the source cell for further processing. communication. Since it is more convenient for the terminal device to fall back to the source cell, according to the above technical solution, the terminal device can quickly resume communication.
  • the indication information is specifically used to indicate that the RRC reconfiguration complete message fails to be sent when accessing the target cell.
  • the indication information is carried in a failure information message (FailureInformation message) or the first message.
  • sending indication information to the network device to which the source cell belongs includes: when it is determined to send the RRC reconfiguration complete message When it fails, send the indication information to the network device to which the source cell belongs according to the signal quality of the source cell; The network device sends the indication information; or, when it is determined that sending the RRC reconfiguration complete message fails, according to the signal quality of the source cell and the signal quality of the target cell, send the indication information to the network device to which the source cell belongs.
  • the terminal device when the terminal device sends indication information to the network device to which the source cell belongs, it considers the signal quality of the source cell and/or the signal quality of the target cell, which is beneficial to ensure the service continuity and reliability of the terminal device.
  • the indication information when it is determined that sending the RRC reconfiguration complete message fails, the indication information should be sent to the network device to which the source cell belongs according to the signal quality of the source cell, including : When it is determined that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell is greater than or equal to a first threshold value, sending the indication information to the network device to which the source cell belongs.
  • the indication information is sent to the network device of the source cell according to the signal quality of the target cell, including: When it is determined that sending the RRC reconfiguration complete message fails and the signal quality of the target cell is less than or equal to the second threshold, the indication information is sent to the network device to which the source cell belongs.
  • the device sending the indication information includes: when it is determined that sending the RRC reconfiguration complete message fails and the signal quality of the source cell is greater than the signal quality of the target cell, sending the indication information to the network device to which the source cell belongs.
  • the method further includes: after sending the RRC reconfiguration complete message, if no ACK signaling is received from the network device to which the target cell belongs, determining Sending the RRC reconfiguration complete message fails; or, after sending the RRC reconfiguration complete message, if receiving NACK signaling from the network device to which the target cell belongs, it is determined that sending the RRC reconfiguration complete message fails.
  • the method further includes: releasing first configuration information, where the first configuration information is configuration information used in the target cell.
  • the terminal device may release the first configuration information before falling back to the source cell for communication.
  • the memory consumption of the terminal device can be saved by releasing the configuration information of the target cell.
  • a communication method is provided, the method is applied to a terminal device, and the method includes: during the process of performing DAPS handover, the random access in the target cell is successful; sending RRC reconfiguration complete to the network device to which the target cell belongs message; when it is determined that sending the RRC reconfiguration complete message fails, determine the RRC re-establishment request message according to the first configuration information or the second configuration information, the first configuration information is the configuration information used in the target cell, and the second configuration information The information is configuration information used in the source cell; sending the RRC re-establishment request message to the network device to which the first cell belongs should be yes.
  • the terminal device after the terminal device performing DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, the terminal device can re-establish the RRC connection according to the configuration information of the source cell or the configuration information of the target cell , thereby restoring communication.
  • the RRC re-establishment request message is determined according to the first configuration information or the second configuration information, including:
  • the first configuration information is released; and the RRC re-establishment request message is determined according to the second configuration information.
  • releasing the second configuration information includes: when it is determined that sending the RRC reconfiguration complete message fails, according to The signal quality of the source cell releases the second configuration information; or, when it is determined that sending the RRC reconfiguration complete message fails, release the second configuration information according to the signal quality of the target cell; or, when it is determined to send the RRC reconfiguration message
  • the completion message fails release the second configuration information according to the signal quality of the source cell and the signal quality of the target cell; or, when it is determined that sending the RRC reconfiguration complete message fails, release the first configuration information, including: When it is determined that sending the RRC reconfiguration complete message fails, release the first configuration information according to the signal quality of the source cell; or, when it is determined that the sending of the RRC reconfiguration complete message fails, release the first configuration information according to the signal quality of the target cell Configuration information; or, when it is determined that sending the RRC reconfiguration complete message fails, releasing
  • the terminal device determines to release the first configuration information or the second configuration information, it considers the signal quality of the source cell and/or the signal quality of the target cell, which is beneficial to ensure the service continuity and reliability of the terminal device.
  • the terminal device performing DAPS handover uses the configuration information of the target cell to re-establish the RRC connection, the memory consumption of the terminal device can be saved by releasing the configuration information of the source cell.
  • the terminal device performing DAPS handover uses the configuration information of the source cell to re-establish the RRC connection, it can save the memory consumption of the terminal device by releasing the configuration information of the target cell.
  • releasing the second configuration information according to the signal quality of the source cell includes: when it is determined to send the RRC reconfiguration complete message When the configuration complete message fails and the signal quality of the source cell is less than or equal to the third threshold, the second configuration information is released.
  • releasing the second configuration information according to the signal quality of the target cell includes: when determining to send the RRC reconfiguration complete message When the configuration complete message fails and the signal quality of the target cell is greater than or equal to the fourth threshold, the second configuration information is released.
  • the method when it is determined that sending the RRC reconfiguration complete message fails, release the second configuration information according to the signal quality of the source cell and the signal quality of the target cell, The method includes: releasing the second configuration information when it is determined that sending the RRC reconfiguration complete message fails and the signal quality of the target cell is greater than the signal quality of the source cell.
  • releasing the first configuration information according to the signal quality of the source cell includes: when it is determined to send the RRC reconfiguration complete message When the configuration complete message fails and the signal quality of the source cell is greater than or equal to the fifth threshold, the first configuration information is released.
  • releasing the first configuration information according to the signal quality of the target cell includes: when determining to send the RRC reconfiguration complete message When the configuration complete message fails and the signal quality of the target cell is less than or equal to the sixth threshold, the first configuration information is released.
  • the method when it is determined that sending the RRC reconfiguration complete message fails, the first configuration information is released according to the signal quality of the source cell and the signal quality of the target cell, The method includes: releasing the first configuration information when it is determined that sending the RRC reconfiguration complete message fails and the signal quality of the source cell is greater than the signal quality of the target cell.
  • the method further includes: after sending the RRC reconfiguration complete message, if no ACK signaling is received from the network device to which the target cell belongs, determining Sending the RRC reconfiguration complete message fails; or, after sending the RRC reconfiguration complete message, if receiving NACK signaling from the network device to which the target cell belongs, it is determined that sending the RRC reconfiguration complete message fails.
  • a communication method is provided, the method is applied to a target network device, and the method includes: during the DAPS handover process, after receiving an RRC reconfiguration completion message from the terminal device; sending a handover success message to the source network device information.
  • the method further includes: before receiving the RRC reconfiguration complete message from the terminal device, sending the handover command message to the terminal device or the source network device , the switching command message is used to instruct the terminal device to switch.
  • the method further includes: after receiving the RRC reconfiguration complete message from the terminal device, sending a release message to the terminal device, where the release message is used to indicate that the The terminal device releases the configuration information used in the source cell.
  • a communication device includes a transceiver unit and a processing unit, during the process of performing DAPS handover, the processing unit is used to perform random access in the target cell successfully; the transceiver unit is used to send the target cell
  • the network device to which the cell belongs sends an RRC reconfiguration complete message; the processing unit is also used to determine that sending the RRC reconfiguration complete message fails; the processing unit is also used to: fall back to the source cell for communication, or perform RRC connection re-establishment.
  • the processing unit is further configured to release the first configuration information, the first configuration information is used in the target cell configuration information.
  • the transceiver unit is further configured to send indication information to the network device to which the source cell belongs, and the indication information is used to indicate Access to the target cell fails, or the RRC reconfiguration complete message fails to be sent.
  • the processing unit is specifically configured to: perform RRC connection re-establishment according to the first configuration information, or perform RRC connection re-establishment according to the second configuration information; the first The configuration information is configuration information used in the target cell, and the second configuration information is configuration information used in the source cell.
  • the processing unit is specifically configured to: release the second configuration information; determine the first cell; determine the RRC re-establishment request message according to the first configuration information; the sending and receiving The unit is further configured to: send the RRC re-establishment request message to the network device to which the first cell belongs; or,
  • the processing unit is specifically used to: determine the first cell; release the second configuration information; determine a radio resource control RRC re-establishment request message according to the first configuration information;
  • the network device sends the RRC re-establishment request message; or,
  • the processing unit is specifically used to: release the first configuration information; determine the first cell; determine the RRC re-establishment request message according to the first configuration information; the transceiver unit is also used to: send to the network device to which the first cell belongs the RRC re-establishment request message; or,
  • the processing unit is specifically used to: determine the first cell; release the first configuration information; determine the RRC re-establishment request message according to the first configuration information; the transceiver unit is also used to: send to the network device to which the first cell belongs The RRC re-establishment request message.
  • the processing unit is specifically configured to: fall back to the source cell for communication if the timer does not expire during the RLM process of the source cell; or, According to the signal quality of the cell, fall back to the source cell for communication, or perform RRC connection re-establishment.
  • the processing unit is specifically configured to: fall back to the source cell for communication according to the signal quality of the source cell, or use the first configuration information to perform RRC connection Re-establishment, or use second configuration information to perform RRC connection re-establishment, the first configuration information is the configuration information used in the target cell, and the second configuration information is the configuration information used in the source cell; or, according to the According to the signal quality of the target cell, fall back to the source cell for communication, or use the first configuration information to perform RRC connection re-establishment, or use the second configuration information to perform RRC connection re-establishment; or, according to the signal of the source cell
  • the quality and the signal quality of the target cell fall back to the source cell for communication, or use the first configuration information to perform RRC connection re-establishment, or use the second configuration information to perform RRC connection re-establishment.
  • the processing unit is specifically configured to: if the signal quality of the source cell satisfies the following condition: the signal quality of the source cell is greater than or equal to the seventh threshold, and less than or equal to the eighth threshold; or, if the signal quality of the source cell is greater than or equal to the first threshold, fall back to the source cell for communication; or, if the signal quality of the source cell satisfies the following conditions: the The signal quality of the source cell is greater than or equal to the ninth threshold and less than or equal to the tenth threshold; or, the signal quality of the source cell is greater than or equal to the fifth threshold, then use the second configuration information to perform RRC Connection re-establishment; or, if the signal quality of the source cell satisfies the following condition: the signal quality of the source cell is less than or equal to a third threshold value, then use the first configuration information to perform RRC connection re-establishment.
  • the processing unit is specifically configured to: if the signal quality of the target cell satisfies the following condition: the signal quality of the target cell is greater than or equal to the eleventh threshold value, and is less than or equal to the twelfth threshold value; or, the signal quality of the target cell is less than or equal to the second threshold value, fall back to the source cell for communication; or, if the signal quality of the target cell satisfies the following Condition: the signal quality of the target cell is less than or equal to the sixth threshold value, then use the second configuration information to perform RRC connection re-establishment; or, if the signal quality of the target cell satisfies the following condition: the signal quality of the target cell is greater than or equal to the thirteenth threshold and less than or equal to the fourteenth threshold; or, the signal quality of the target cell is greater than or equal to the fourth threshold, then use the first configuration information to perform RRC connection re-establishment.
  • the processing unit is specifically configured to: if the signal quality of the source cell and the signal quality of the target cell meet the following condition: the signal quality of the source cell is greater than the target cell The signal quality of the cell, and/or, the difference between the signal quality of the source cell and the signal quality of the target cell is greater than or equal to the fifteenth threshold and less than or equal to the sixteenth threshold; or, the The signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to the seventeenth threshold; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the target cell If the signal quality of the source cell is less than or equal to the eighteenth threshold value, fall back to the source cell for communication; or, if the signal quality of the source cell and the signal quality of the target cell meet the following conditions: the signal quality of the source cell is greater than The signal quality of the target cell, and/or, the difference between the signal
  • the processing unit is further configured to: stop the timer T304, and maintain the RLM of the source cell.
  • the processing unit is further configured to: stop the RLM of the source cell.
  • the processing unit is further configured to: stop the timer T304 and stop the RLM of the source cell.
  • the processing unit is further configured to: maintain the timer T304 and the RLM of the source cell.
  • the processing unit is further configured to: stop the timer T304 and the RLM of the source cell.
  • a communication device in a sixth aspect, may be a terminal device, or a component in the terminal device.
  • the communication device may include various modules or units configured to execute the second aspect and the method in any possible implementation manner of the second aspect.
  • a communication device in a seventh aspect, is provided, and the communication device may be a terminal device, or a component in the terminal device.
  • the communications device may include various modules or units configured to execute the third aspect and the method in any possible implementation manner of the third aspect.
  • a communication device in an eighth aspect, includes a transceiver unit.
  • the transceiver unit is used to send the handover success message to the source network device. information.
  • the transceiver unit before receiving the RRC reconfiguration complete message from the terminal device, the transceiver unit is further configured to send the handover command to the terminal device or the source network device message, the switching command message is used to instruct the terminal device to switch.
  • the method further includes: after receiving the RRC reconfiguration completion message from the terminal device, the transceiver unit is further configured to send a release message to the terminal device, the The release message is used to instruct the terminal equipment to release the configuration information used in the source cell.
  • a communication device including a processor.
  • the processor is coupled with the memory, and can be used to execute instructions in the memory, so as to implement the method in any one possible implementation manner of the first aspect to the third aspect and the first aspect to the third aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a terminal device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication device is a chip configured in a terminal device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a communication device including a processor.
  • the processor is coupled with the memory, and can be used to execute instructions in the memory, so as to implement the fourth aspect and the method in any possible implementation manner of the fourth aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a network device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication device is a chip configured in a network device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a processor including: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any one possible implementation manner of the first aspect to the fourth aspect.
  • the above-mentioned processor can be one or more chips
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop and various logic circuits, etc. .
  • the input signal received by the input circuit may be received and input by, for example but not limited to, the receiver
  • the output signal of the output circuit may be, for example but not limited to, output to the transmitter and transmitted by the transmitter
  • the circuit may be the same circuit, which is used as an input circuit and an output circuit respectively at different times.
  • the embodiment of the present application does not limit the specific implementation manners of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and may receive signals through the receiver and transmit signals through the transmitter, so as to execute the method in any possible implementation manner of the first aspect to the fourth aspect.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory may be set separately from the processor.
  • the memory can be a non-transitory (non-transitory) memory, such as a read-only memory (read only memory, ROM), which can be integrated with the processor on the same chip, or can be respectively arranged in different On the chip, the embodiment of the present application does not limit the type of the memory and the configuration of the memory and the processor.
  • a non-transitory memory such as a read-only memory (read only memory, ROM)
  • ROM read only memory
  • a related data interaction process such as sending indication information may be a process of outputting indication information from a processor
  • receiving capability information may be a process of receiving input capability information from a processor.
  • the data output by the processor may be output to the transmitter, and the input data received by the processor may be from the receiver.
  • the transmitter and the receiver may be collectively referred to as a transceiver.
  • the processing device in the above-mentioned twelfth aspect may be one or more chips.
  • the processor in the processing device may be implemented by hardware or by software.
  • the processor When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor may be a general-purpose processor, which is implemented by reading software codes stored in a memory, which can Integrated in a processor, it can exist independently of that processor.
  • a computer program product including: a computer program (also referred to as code, or an instruction), when the computer program is executed, the computer executes the above-mentioned first aspect to The method in any possible implementation manner in the fourth aspect.
  • a computer program also referred to as code, or an instruction
  • a computer-readable storage medium stores a computer program (also referred to as code, or instruction) when it is run on a computer, so that the above-mentioned first aspect to The method in any possible implementation manner of the fourth aspect is executed.
  • a computer program also referred to as code, or instruction
  • a fifteenth aspect provides a communication system, including the aforementioned terminal device and network device.
  • Fig. 1 is a schematic diagram of a communication system applicable to the communication method provided by the embodiment of the present application.
  • Fig. 2 shows a schematic flow chart of a terminal device performing DAPS handover.
  • FIG. 3 to FIG. 8 show schematic flowcharts of the communication method provided by the embodiment of the present application.
  • FIG. 9 shows a schematic diagram of a communication device provided by an embodiment of the present application.
  • Fig. 10 shows a schematic block diagram of a communication device provided by another embodiment of the present application.
  • FIG. 11 shows a schematic diagram of a chip system provided by an embodiment of the present application.
  • LTE Long Term Evolution
  • FDD frequency division duplex
  • UMTS Universal Mobile Telecommunications System
  • WiMAX Worldwide Interoperability for Microwave Access
  • V2X can include vehicle to Internet (vehicle to network, V2N), vehicle to vehicle (vehicle to-vehicle, V2V), Vehicle to infrastructure (vehicle to infrastructure, V2I), vehicle to pedestrian (vehicle to pedestrian, V2P), etc.
  • long term evolution technology of vehicle communication Long Term Evolution-Vehicle, LTE-V
  • Internet of Vehicles machine type communication communication, MTC
  • MTC machine type communication communication
  • the network device may be any device with a wireless transceiver function.
  • the equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller, BSC) , base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), wireless fidelity (wireless fidelity, WiFi) system Access point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as NR , a gNB in the system, or, a transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of a base station in a 5G
  • 5G such
  • a gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB.
  • CU is responsible for processing non-real-time protocols and services, realizing radio resource control (radio resource control, RRC), service data adaptation protocol stack (service data adaptation protocol, SDAP) ) protocol layer, the function of packet data convergence protocol (PDCP) layer.
  • the DU is responsible for processing physical layer protocols and real-time services, realizing the functions of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical (physical, PHY) layer.
  • the AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , or, sent by DU+AAU.
  • the network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network devices in an access network (radio access network, RAN), and the CU can also be divided into network devices in a core network (core network, CN), which is not limited in this application.
  • the functions of the CU entity can be implemented by one or more entities.
  • the functions of the CU entity can be further divided, for example, the functions of the control plane (control plane, CP) and the functions of the user plane (user plane, UP) can be separated, that is, the CU entity includes the control plane of the CU (CU- CP) entity and CU user plane (CU-UP) entity, the CU-CP entity and CU-UP entity can be coupled with the DU entity to jointly complete the functions of the network device.
  • the CU-CP entity is responsible for the control plane function, mainly including the RRC protocol layer and the PDCP control plane (PDCP control plane, PDCP-C) protocol layer.
  • the PDCP-C protocol layer is mainly responsible for encryption and decryption of data on the control plane, integrity protection, and data transmission.
  • the CU-UP entity is responsible for user plane functions, mainly including SDAP protocol layer and PDCP user plane (PDCP user plane, PDCP-U) protocol layer.
  • the SDAP protocol layer is mainly responsible for mapping the data flow (flow) of the core network to the bearer.
  • the PDCP-U protocol layer is mainly responsible for encryption and decryption of the data plane, integrity protection, header compression, serial number maintenance, data transmission, etc.
  • the CU-CP entity and the CU-UP entity are connected through an interface (such as an E1 interface).
  • the CU-CP entity is connected to the DU entity through the F1-C (control plane), and the CU-UP entity is connected to the DU entity through the F1-U (user plane).
  • the CU-CP entity represents the control plane of the network equipment and the core network (such as the mobility management entity (MME) of the fourth generation (4th generation, 4G) core network, or the 5G core network (5G core, 5GC) Access and mobility management function (access and mobility management function, AMF) network element) connection;
  • CU-UP entity represents the user plane of the network device and the core network (such as the serving gateway (SGW) of the 4G core network, or the 5G core
  • SGW serving gateway
  • the user plane function (UPF) network element of the network is connected;
  • the DU entity represents the connection between the network device and the terminal device.
  • the network device provides services for the cell, and the terminal device communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network device.
  • the cell may belong to a macro base station (for example, a macro eNB or a macro gNB, etc.) , can also belong to the base station corresponding to a small cell, where the small cell can include: a metro cell, a micro cell, a pico cell, a femto cell, etc. , these small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • the terminal equipment includes user equipment (user equipment, UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless Communication Device, User Agent, or User Device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local Loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistants, PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle
  • wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories.
  • Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the terminal device may also be a terminal device in an Internet of Things (internet of things, IoT) system.
  • IoT Internet of things
  • Its main technical feature is to connect objects to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and object interconnection.
  • the present application does not limit the specific form of the terminal device.
  • Fig. 1 shows a schematic diagram of a communication system applicable to a communication method and a communication device according to an embodiment of the present application.
  • the communication system 100 may include at least two network devices, such as the network device 110 and the network device 120 shown in Figure 1; the communication system 100 may also include at least one terminal device, such as the terminal device shown in Figure 1 130. Wherein, the terminal device 130 may be mobile or fixed.
  • Both the network device 110 and the network device 120 are devices capable of communicating with the terminal device 130 through a wireless link, such as a base station or a base station controller. Each network device can cover a specific geographical area through communication, and can communicate with terminal devices located in the coverage area (cell).
  • Figure 1 exemplarily shows two network devices and one terminal device.
  • the communication system 100 may include at least one network device and other numbers of terminal devices may be included within the coverage of each network device. Examples are not limited to this.
  • Each of the aforementioned communication devices may be configured with multiple antennas.
  • the plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals.
  • each communication device additionally includes a transmitter chain and a receiver chain, and those of ordinary skill in the art can understand that they all include a plurality of components related to signal transmission and reception (such as processors, modulators, multiplexers, etc.) , demodulator, demultiplexer or antenna, etc.). Therefore, the network device and the terminal device can communicate through the multi-antenna technology.
  • the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, to which this embodiment of the present application is not limited.
  • network entities such as a network controller and a mobility management entity, to which this embodiment of the present application is not limited.
  • RRC re-establishment When handover failure, reconfiguration failure, integrity detection failure, radio link failure (radio link failure, RLF) and other situations occur in the terminal device, the terminal device can initiate the RRC re-establishment process.
  • RLF radio link failure
  • the RRC re-establishment process may include the following steps:
  • Step 1 the terminal device sends an RRC re-establishment request message to the re-establishment cell (or the network device to which the re-establishment cell belongs);
  • Step 2 re-establishing the request of the cell to allow the terminal equipment, then sending an RRC re-establishment message to the terminal equipment;
  • Step 3 The terminal device sends an RRC re-establishment complete message to the re-established cell.
  • the re-established cell here may be a cell determined by the terminal device through cell search or detection.
  • a re-established cell may be a cell that satisfies predetermined criteria. Such as the cell selection S criterion in the NR protocol TS38.304-f30.
  • predetermined criteria such as the cell selection S criterion in the NR protocol TS38.304-f30.
  • the process of the terminal device sending a message to the cell is essentially that the terminal device sends a message to the network device to which the cell belongs, and the network device to which the cell belongs may be a serving base station for the cell.
  • the terminal device sends a message to the cell is used for description.
  • the terminal device uses configuration #1 provided by base station #1 for the terminal device.
  • Step 1 the terminal device receives a handover command from base station #1, the handover command includes that base station #2 provides the terminal device with configuration #2 used in cell #2, the terminal device releases configuration #1, and releases the connection with cell #1;
  • Step 2 The terminal device accesses cell #2 according to configuration #2. If the terminal device fails to access cell #2, start the RRC re-establishment process according to configuration #2;
  • Step 3 The terminal device selects a suitable re-establishment cell, starts an RRC re-establishment procedure, and sends an RRC re-establishment request message to the re-establishment cell.
  • the RRC re-establishment request message is determined according to configuration #2, and the RRC re-establishment request message includes: the security configuration corresponding to configuration #2, the physical cell identifier (physical cell identifier, PCI) of cell #2, the cell #2 A cell-radio network temporary identifier (cell-radio network temporary identifier, C-RNTI) assigned to the terminal device, etc.
  • Handover In a wireless communication system, when a terminal device moves/approaches from one cell to another, in order to ensure that the communication of the terminal device is not interrupted, a handover is required.
  • the source cell means the cell serving the terminal device before the handover
  • the target cell means the cell providing the service for the terminal device after the handover.
  • the relevant information of the target cell (such as the PCI of the target cell, frequency information, random access resource information required for handover to the target cell, etc.) can be indicated by switching the cell, and the handover message is the network device to which the source cell belongs (that is, the source network device) to the terminal device.
  • Handover can be intra-station handover or inter-station handover.
  • Intra-site handover means that the source cell and the target cell belong to the same network device (such as a base station), where the source cell and the target cell can be the same cell or different cells;
  • inter-site handover means that the source cell and the target cell belong to different Network equipment (such as base stations). This application does not limit this.
  • a cell is a coverage area of a network device
  • a source cell corresponds to a source network device (such as a source base station)
  • a target cell corresponds to a target network device (such as a target base station).
  • DAPS handover In order to ensure zero interruption during the handover process of terminal equipment, DAPS handover is introduced in the communication industry standard.
  • the terminal device disconnects from the source cell after receiving a handover command from the source network device, and accesses the target cell.
  • the terminal equipment receives the handover command sent by the source network equipment, and then accesses the target cell.
  • the terminal equipment still maintains the link communication with the source cell until the target network
  • the device notifies the terminal device to completely release the configuration of the source cell, and the terminal device stops communication with the source cell and releases the communication link with the source cell.
  • Fig. 2 shows a schematic flow chart of a terminal device performing DAPS handover.
  • Step 1 The source gNB (sourcegNB) configures the UE measurement process, and the UE reports a measurement report according to the measurement configuration.
  • Step 2 the source gNB decides to handover the UE according to the measurement report and radio resource management (radio resource management, RRM) information.
  • radio resource management radio resource management, RRM
  • Step 3 The source gNB sends a handover request (handover request) message to the target gNB (targetgNB).
  • the handover request message contains necessary information for the target gNB to prepare for handover.
  • the handover request message may include: target cell identifier (identifier, ID), security key (K gNB* ), UE's C-RNTI at the source gNB, UE RRM configuration, information including antenna information and downlink (downlink, DL) carrier frequency Basic access stratum (access stratum, AS) configuration, or UE capabilities of different radio access technologies (radio access technology, RAT), etc.
  • Step 4 The target gNB performs admission control according to the necessary information provided by the handover request message. Determine whether to agree UE handover to target gNB.
  • Step 5 The target gNB sends a handover request acknowledge (handover request acknowledge) message to the source gNB.
  • the handover request acknowledgment message includes a transparent container (container), which will be sent to the UE as an RRC message to perform handover.
  • Step 6 The source gNB sends an RRC reconfiguration message to the UE to trigger UE handover.
  • the RRC reconfiguration message includes the handover configuration, which includes the information required to access the target cell: the target cell ID, the C-RNTI allocated by the target cell to the UE, the selected security algorithm or security algorithm identifier and other information.
  • the handover configuration may also include a set of dedicated random access channel (random access channel, RACH) resources, common RACH resources, system information of the target cell, and the like.
  • RACH dedicated random access channel
  • Step 7a the source gNB sends early status transfer (early status transfer) information to the target gNB.
  • Step 7 The source gNB sends sequence number (sequence number, SN) status transfer (SN status transfer) information to the target gNB.
  • Step 8 The UE synchronizes to the target cell, and completes the RRC handover process by sending an RRC reconfiguration complete (RRC reconfiguration complete) message to the target gNB.
  • RRC reconfiguration complete RRC reconfiguration complete
  • the RRC reconfiguration complete message is also called a handover complete message.
  • the UE sends an RRC reconfiguration complete message to the target cell.
  • the RRC reconfiguration complete message belongs to signaling radio bearer 1 (SRB1), and the message is in acknowledgment mode (AM), with automatic repeat reQuest (ARQ) guarantee.
  • SRB1 signaling radio bearer 1
  • AM acknowledgment mode
  • ARQ automatic repeat reQuest
  • the target gNB will send an acknowledgment (acknowledgment, ACK) to the UE to indicate successful reception.
  • the target gNB fails to receive the RRC reconfiguration complete message, it will reply a negative acknowledgment (negative acknowledgment, NACK) to the UE to indicate the reception failure.
  • NACK negative acknowledgment
  • Step 8a the target gNB sends a handover success message to the source gNB. To indicate that the UE has successfully handed over to the target gNB.
  • Step 8b the source gNB sends an SN state transition message to the target gNB.
  • Step 9 the target gNB sends a path switch request (path switch request) to the AMF.
  • Step 10 5GC establishes a downlink path connection from the UPF(s) to the target gNB.
  • Step 11 AMF sends a path switch request acknowledge (path switch request acknowledge) to the target gNB.
  • Step 12 the target gNB sends a UE context release (UE context release) message to the source gNB.
  • UE context release UE context release
  • Step 13 The target gNB sends a release source cell message to the UE, which is used to instruct the UE to release the source signaling radio bearer (Signaling radio bearer, SRB) resources and the security configuration of the source cell, and stop communication with the source cell Downlink/uplink reception/transmission.
  • Step 13 is performed after step 8, that is, after the UE successfully sends the RRC reconfiguration complete message, and step 13 is a step independent of step 8a to step 12.
  • the UE will not disconnect from the source cell after receiving the RRC reconfiguration message. That is to say, the UE continues to maintain the configuration provided by the source cell to the UE, and maintains link communication with the source cell.
  • the UE After completing step 8 in Figure 2, only when the UE receives an explicit message (release source cell message) sent by the target gNB indicating that the UE releases the source cell, the UE will stop downlink/uplink reception/transmission with the source cell.
  • the RRC reconfiguration complete message sent to the target gNB is in AM mode, which has ARQ guarantee. If the UE does not receive the ACK signaling from the target gNB after sending the RRC reconfiguration complete message, or receives the NACK signaling sent by the target gNB, the UE determines that the RRC reconfiguration complete message fails to be sent. However, in the case that the RRC reconfiguration complete message fails to be sent, how the UE resumes communication is a technical problem to be solved urgently.
  • the present application provides a communication method, so that when a terminal device performing DAPS handover successfully accesses a target cell but fails to send an RRC reconfiguration complete message, the terminal device can resume communication.
  • Form indication may include direct indication and indirect indication, and may also include explicit indication and implicit indication.
  • the information indicated by a certain information is called the information to be indicated.
  • the information to be indicated can be directly indicated, such as the message to be indicated itself or the An index of information to be indicated, etc.
  • the information to be indicated may also be indicated indirectly by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance.
  • the indication of the information to be indicated can also be realized by means of a pre-agreement (for example, a protocol regulation) whether there is a certain information element, thereby reducing the indication overhead to a certain extent.
  • a pre-agreement for example, a protocol regulation
  • the first, second and various numbers are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, different instruction information, different time intervals, etc. are distinguished.
  • predefinition or “preconfiguration” can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices).
  • a specific implementation manner is not limited.
  • "preserving” may refer to storing in one or more memories.
  • the one or more memories may be provided independently, or may be integrated in an encoder or decoder, a processor, or a communication device.
  • the one or more memories may also be partially provided separately, and partially integrated in the decoder, processor, or communication device.
  • the type of the storage may be any form of storage medium, which is not limited in this application.
  • the "protocol” involved in the embodiment of the present application may refer to a standard protocol in the communication field, for example, may include LTE protocol, NR protocol and related protocols applied in future communication systems, which is not limited in this application.
  • At least one means one or more, and “multiple” means two or more.
  • “And/or” describes the relationship between associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can be identified: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an "or” relationship.
  • “At least one of the following” or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items.
  • At least one (one) of a, b and c may represent: a, or, b, or, c, or a and b, or, a and c, or, b and c, or, a, b and c.
  • a, b and c can be single or multiple.
  • the names of the messages involved are the names of the messages in the NR.
  • these message names are only examples for easy understanding, and should not constitute any limitation to the present application. This application does not exclude the possibility of defining other message names in future protocols to replace the message names listed in this application to achieve the same or similar functions.
  • the embodiment of the present application is described by taking the message name in the NR as an example, which should not limit the scenarios used by the method provided in the present application.
  • the method provided in this application can also be applied to the LTE system.
  • RRC reconfiguration and RRC re-establishment in the following embodiments can be replaced with “RRC connection re-configuration”, “RRC connection re-establishment” and the like respectively.
  • RRC connection re-configuration RRC connection re-establishment
  • RRC connection re-establishment RRC connection re-establishment
  • the terminal device shown in the following embodiments may be replaced with components (such as chips or circuits) configured in the terminal device.
  • the network devices shown in the following embodiments may also be replaced with components (such as chips or circuits) configured in the network devices.
  • the embodiments shown below do not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application.
  • the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in a terminal device or a network device that can call a program and execute the program.
  • FIG. 3 is a schematic flowchart of a communication method 300 provided by an embodiment of the present application from the perspective of device interaction. As shown in FIG. 3 , the method 300 may include S310 to S340a/S340b. Each step in the method 300 is described in detail below.
  • the terminal device successfully performs random access in the target cell.
  • S310 may include:
  • the terminal device receives an RRC reconfiguration message from network device #2.
  • the RRC reconfiguration message includes configuration information #1, and configuration information #1 is the configuration information used by the terminal device in the target cell, or configuration information #1 is the configuration information used by the terminal device to communicate in the target cell, or configuration information #1 is the configuration information provided by the network device #1 for the terminal device, or the configuration information #1 is the configuration information provided by the network device #1 for the terminal device and used for communication in the target cell.
  • the network device #1 is the target network device, that is, the network device #1 is the network device to which the target cell belongs.
  • the network device #2 is the source network device, that is, the network device #2 is the network device to which the source cell belongs.
  • Configuration information #1 includes at least one of the following: the PCI of the target cell, the C-RNTI allocated by network device #1 to the terminal device, and the target network device security algorithm identifier for the selected security algorithm (the target gNB security algorithm identifiers for the selected security algorithms), RACH resource information required to access the target cell (for example, dedicated RACH resources and/or public RACH resources), and system information of the target cell.
  • configuration information #1 may include more parameters, which is not limited in this embodiment of the present application.
  • the terminal device initiates random access to the target cell according to configuration information #1, and successfully accesses the target cell.
  • the terminal device determines to perform random access in the target cell after receiving message B (message B, MSGB) from network device #1. success.
  • the terminal device determines to perform random access in the target cell after receiving message 4 (message 4, MSG4) from network device #1. success.
  • the method 300 further includes: the terminal device stops the timer T304, and maintains the radio link monitor (radio link monitor, RLM) of the source cell.
  • RLM radio link monitor
  • the terminal device always maintains the RLM of the source cell, and does not stop the RLM of the source cell until the terminal device determines that the sending of the RRC reconfiguration complete message is successful.
  • the method 300 further includes: the terminal device stops the timer T304 and stops the RLM of the source cell.
  • the terminal device may first stop the RLM of the source cell, and then stop the timer T304; or, first stop the timer T304, and then stop the RLM of the source cell; or, stop the RLM and the timer T304 of the source cell at the same time.
  • This embodiment of the present application does not limit it.
  • the method 300 further includes: the terminal device maintains the timer T304 and the RLM of the source cell. Specifically, the terminal device always maintains the timer T304 and the RLM of the source cell, and stops the timer T304 and the RLM of the source cell until the terminal device determines that the sending of the RRC reconfiguration complete message is successful.
  • the terminal device sends an RRC reconfiguration complete message to network device #1.
  • the terminal device stops the timer T304 after the random access to the target cell succeeds, the terminal device sends an RRC reconfiguration complete message to the network device #1 after stopping the timer T304.
  • the terminal device stops the timer T304 and the RLM of the source cell after the random access of the target cell is successful, the terminal device sends an RRC to network device #1 after stopping the timer T304 and stopping the RLM of the source cell Reconfiguration complete message.
  • the terminal device determines that sending the RRC reconfiguration complete message fails.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, including: if the terminal device does not receive the ACK signaling sent by the network device #1, or the terminal device receives the NACK signaling from the network device #1, then the terminal device The device determines that sending the RRC reconfiguration complete message fails.
  • the network device #1 if the network device #1 successfully receives the RRC reconfiguration completion message sent by the terminal device, the network device #1 feeds back ACK signaling to the terminal device; if the network device #1 fails to receive the RRC reconfiguration completion message, Then the network device #1 feeds back the NACK signaling to the terminal device.
  • the terminal device sends the RRC reconfiguration complete message to the network device #1, if it receives the NACK signaling sent by the network device #1, it will retransmit the RRC reconfiguration complete message to the network device #1.
  • the system limits the number of retransmissions to X times, then network device #1 receives X times of RRC reconfiguration completion messages, but still cannot receive them correctly, and will feed back X times of NACK signaling to the terminal device.
  • the terminal device determines that the sending of the RRC reconfiguration complete message fails.
  • X is an integer greater than or equal to 1.
  • the terminal device when the terminal device receives NACK signaling from network device #1, it may be that it has received X times of NACK signaling, or it has received NACK signaling for a period of time T. where X is an integer greater than or equal to 1. Thus, the terminal device determines that sending the RRC reconfiguration complete message fails.
  • the embodiment of the present application does not limit the value of X.
  • the method 300 further includes: stopping the RLM of the source cell.
  • the method 300 further includes: stopping the timer T304 and Stop the RLM of the source cell.
  • the method 300 continues to execute S340a or S340b.
  • the terminal device reverts back to (revert back to) the source cell for communication.
  • the process of the terminal device falling back to the source cell for communication is essentially that the terminal device communicates with the network device (network device #2) to which the source cell belongs.
  • the terminal device falls back to the source cell for communication, that is, the terminal device continues to communicate with network device #2 through the connection with the source cell.
  • the terminal device After the terminal device receives the RRC reconfiguration message sent by the network device #2, it will not immediately release the configuration information #2, only when it receives the display message sent by the network device #1 to instruct the terminal device When the configuration information #2 is released, the terminal device will release the configuration information #2 and stop communicating with the network device #2.
  • the terminal device fails to send the RRC reconfiguration complete message (it can also be said that the network device #1 has not received the RRC reconfiguration complete message), the terminal device will not receive the information sent by the network device #1 to indicate the release of the configuration Display message for #2. Therefore, in the case that the terminal device fails to send the RRC reconfiguration complete message, the terminal device always saves the configuration information #2 and keeps communicating with the network device #2. Based on this, when the terminal device determines that sending the RRC reconfiguration complete message fails, it can fall back to the source cell for communication.
  • configuration information #2 is configuration information used by the terminal device in the source cell, or configuration information #2 is configuration information used by the terminal device for communication in the source cell.
  • the configuration information #2 includes at least one of the following: PCI of the source cell, measurement configuration, mobility control configuration, radio resource configuration, AS security configuration, and C-RNTI allocated by the network device #1 to the terminal device.
  • the radio resource configuration may be radio bearer (radio bearer, RB) configuration, or media access control (media access control, MAC) main configuration, physical channel configuration, and the like.
  • Configuration information #2 may also include more parameters, which is not limited in this embodiment of the present application.
  • the method 300 further includes: the terminal device releases configuration information #1.
  • the method 300 further includes: the terminal device sends indication information to network device #2, where the indication information is used to indicate failure to access the target cell, or, the indication The information is used to indicate that the RRC reconfiguration complete message fails to be sent.
  • the terminal device after the terminal device performing DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, the terminal device falls back to the source cell for communication. Since it is more convenient for the terminal device to fall back to the source cell, according to the embodiment of the present application, the terminal device can quickly resume communication. In addition, in the case of falling back to the source cell for communication, the terminal device releases the configuration information #1, which can save the memory consumption of the terminal device.
  • the terminal device re-establishes the RRC connection.
  • the terminal device when the terminal device fails to send the RRC reconfiguration complete message, the terminal device saves configuration information #1 and configuration information #2, so the terminal device can perform RRC connection according to configuration information #1 or configuration information #2 Rebuild.
  • the terminal device performs RRC connection re-establishment according to configuration information #1.
  • the terminal device performing RRC connection re-establishment according to configuration information #1 includes the following steps:
  • the terminal device releases configuration information #2.
  • the terminal device releasing configuration information #2 can be understood as the terminal device deleting the stored configuration information #2, or the terminal device releasing the link between the terminal device and the source cell, or the terminal device releasing the connection between the terminal device and the network device #2 .
  • the terminal device determines the first cell.
  • the first cell is the cell where the terminal device initiates re-establishment.
  • the terminal device may determine the first cell according to its internal implementation, or according to a predetermined criterion. For example, the terminal device may select a cell satisfying a predetermined criterion from neighboring cells, and the predetermined criterion may be a cell selection criterion. For example, the terminal device performs cell selection, and uses the cell that satisfies the S criterion for cell selection as the first cell.
  • the first cell determined by the terminal device may be the target cell or other cells, which is not limited in this embodiment of the present application.
  • the terminal device determines the RRC re-establishment request message according to the configuration information #1.
  • the RRC re-establishment request message includes one or more of the following parameters: the PCI of the target cell, the C-RNTI used by the terminal device in the target cell, and the short message authentication code (short message authentication) used by the terminal device in the target cell code for integrity, short MAC-I).
  • the terminal device sends an RRC re-establishment request message to network device #3.
  • network device #3 is the network device to which the first cell belongs. It can be understood that if the first cell is the target cell, or if the first cell and the target cell are on the same site, network device #3 and network device #1 are the same network device. Alternatively, if the first cell is the source cell, or the first cell and the source cell are on the same site, network device #3 and network device #1 are the same network device.
  • the terminal device performing RRC connection re-establishment according to configuration information #1 includes the following steps:
  • the terminal device determines the first cell.
  • the first cell is the cell where the terminal device initiates re-establishment.
  • the terminal device may determine the first cell according to its internal implementation, or according to a predetermined criterion. For example, the terminal device may select a cell satisfying a predetermined criterion from neighboring cells, and the predetermined criterion may be a cell selection criterion. For example, the terminal device performs cell selection, and uses the cell that satisfies the S criterion for cell selection as the first cell.
  • the first cell determined by the terminal device may be a cell under network device #1, or a cell under another network device except network device #2, which is not limited in this embodiment of the present application.
  • the terminal device releasing configuration information #2 can be understood as the terminal device deleting the stored configuration information #2, or the terminal device releasing the link between the terminal device and the source cell, or the terminal device releasing the connection between the terminal device and the network device #2 .
  • the terminal device determines the RRC re-establishment request message according to the configuration information #1.
  • the RRC re-establishment request message includes one or more of the following parameters: PCI of the target cell, C-RNTI used by the terminal device in the target cell, and short MAC-I used by the terminal device in the target cell.
  • the terminal device sends an RRC re-establishment request message to network device #3.
  • the method 300 further includes: selecting and using configuration information #1 to perform When the RRC connection is re-established, stop the RLM of the source cell.
  • the method 300 further includes: selecting and using the configuration information When #1 performs RRC connection re-establishment, stop the timer T304 and stop the RLM of the source cell.
  • the terminal device performs RRC connection re-establishment according to configuration information #2.
  • the terminal device performing RRC connection re-establishment according to configuration information #2 includes the following steps:
  • the terminal device releases the configuration information #1.
  • the terminal device releasing configuration information #1 can be understood as the terminal device deleting the stored configuration information #1, or the terminal device releasing the link between the terminal device and the target cell, or the terminal device releasing the connection between the terminal device and the network device #1 .
  • the terminal device determines the first cell.
  • the first cell is the cell where the terminal device initiates re-establishment.
  • the terminal device may determine the first cell according to its internal implementation, or according to a predetermined criterion. For example, the terminal device may select a cell satisfying a predetermined criterion from neighboring cells, and the predetermined criterion may be a cell selection criterion. For example, the terminal device performs cell selection, and uses the cell that satisfies the S criterion for cell selection as the first cell.
  • the first cell determined by the terminal device may be the source cell or other cells, which is not limited in this embodiment of the present application.
  • the terminal device determines the RRC re-establishment request message according to configuration information #2.
  • the RRC re-establishment request message includes one or more of the following parameters: PCI of the source cell, C-RNTI used by the terminal device in the source cell, and short MAC-I used by the terminal device in the source cell.
  • the terminal device sends an RRC re-establishment request message to network device #3.
  • network device #3 is the network device to which the first cell belongs. It can be understood that if the first cell is the target cell, or if the first cell and the target cell are on the same site, network device #3 and network device #1 are the same network device. Alternatively, if the first cell is the source cell, or the first cell and the source cell are on the same site, network device #3 and network device #1 are the same network device.
  • the terminal device performing RRC connection re-establishment according to configuration information #2 includes the following steps:
  • the terminal device determines the first cell.
  • the first cell is the cell where the terminal device initiates re-establishment.
  • the terminal device may determine the first cell according to its internal implementation, or according to a predetermined criterion. For example, the terminal device may select a cell satisfying a predetermined criterion from neighboring cells, and the predetermined criterion may be a cell selection criterion. For example, the terminal device performs cell selection, and uses the cell that satisfies the S criterion for cell selection as the first cell.
  • the first cell determined by the terminal device may be a cell under network device #2, or a cell under another network device except network device #1, which is not limited in this embodiment of the present application.
  • the terminal device releases the configuration information #1.
  • the terminal device releasing configuration information #1 can be understood as the terminal device deleting the stored configuration information #1, or the terminal device releasing the link between the terminal device and the target cell, or the terminal device releasing the connection between the terminal device and the network device #1 .
  • the terminal device determines the RRC re-establishment request message according to configuration information #2.
  • the RRC re-establishment request message includes one or more of the following parameters: PCI of the source cell, C-RNTI used by the terminal device in the source cell, and short MAC-I used by the terminal device in the source cell.
  • the terminal device sends an RRC re-establishment request message to network device #3.
  • the terminal device chooses to use configuration information #2 to re-establish the RRC connection, the terminal device will not stop the RLM and timer T304 of the source cell.
  • the terminal device after the terminal device performing DAPS handover successfully accesses the target cell, if it is determined that sending the RRC reconfiguration complete message fails, the terminal device performs RRC connection re-establishment. Since the terminal device can select a cell with better signal quality to initiate re-establishment when re-establishing the RRC connection, according to the embodiment of the present application, the terminal device can determine a high-quality cell to resume communication, so as to maintain optimal service continuity as much as possible sex and reliability.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, in the RLM process of the source cell, if the timer (such as timer T310 or timer T312) has not expired, the terminal device falls back to the source The cell communicates.
  • the timer such as timer T310 or timer T312
  • the terminal device chooses to fall back to the source cell for communication or to re-establish the RRC connection according to the quality of the cell.
  • the cell quality includes the signal quality of the source cell and/or the signal quality of the target cell.
  • Signal quality includes signal quality including reference signal received power (reference signal received power, RSRP) or reference signal received quality (reference signal received quality, RSRQ), etc.
  • the terminal device chooses to fall back to the source cell for communication or to re-establish the RRC connection according to the signal quality of the source cell.
  • the implementation manner will be described in detail below with reference to FIG. 4 , and will not be described in detail here.
  • the terminal device chooses to fall back to the source cell for communication or to re-establish the RRC connection according to the signal quality of the target cell.
  • the implementation manner will be described in detail below with reference to FIG. 5 , and will not be described in detail here.
  • the terminal device chooses to fall back to the source cell for communication or to re-establish the RRC connection according to the signal quality of the source cell and the signal quality of the target cell. Or it can be said that the terminal device compares the signal quality of the source cell and the signal quality of the target cell, and chooses to fall back to the source cell for communication, or to re-establish the RRC connection.
  • the implementation manner will be described in detail below with reference to FIG. 6 , and will not be described in detail here.
  • FIG. 4 shows a schematic flowchart of a communication method 400 provided by another embodiment of the present application.
  • the method 400 may include S410 to S440.
  • S410 to S430 are the same as S310 to S330 in the method 300, and for the sake of brevity, details are not repeated in this embodiment of the present application.
  • the terminal device falls back to the source cell for communication, or performs RRC connection re-establishment.
  • re-establishing the RRC connection by the terminal device includes: using configuration information #1 to perform RRC connection re-establishment, or using configuration information #2 to perform RRC connection re-establishment. Therefore, S440 specifically includes: the terminal device falls back to the source cell for communication according to the signal quality of the source cell, or uses configuration information #1 to perform RRC connection re-establishment, or uses configuration information #2 to perform RRC connection re-establishment. Wherein, for the description about configuration information #1 and configuration information #2, reference may be made to S310 above.
  • condition #1 the signal quality of the source cell satisfies the following condition (denoted as condition #1): the signal quality of the source cell is greater than or equal to threshold #7 and less than or equal to threshold #8; or, the signal quality of the source cell If the signal quality is greater than or equal to the threshold #1, the terminal device falls back to the source cell for communication.
  • condition #2 the signal quality of the source cell is greater than or equal to threshold #9 and less than or equal to threshold #10; or, the source cell If the signal quality is less than or equal to threshold #5, the terminal device uses configuration information #2 to re-establish the RRC connection.
  • condition #3 the signal quality of the source cell is less than or equal to the threshold value #3, then the terminal device uses configuration information #1 to perform RRC connection re-establishment.
  • the above conditions #1 to #3 may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • One or more of the above thresholds may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • Different threshold values in the foregoing threshold values may be the same or different, which is not limited in this embodiment of the present application.
  • This embodiment of the present application does not limit that the terminal device is pre-configured with one or more of the foregoing conditions #1 to #3.
  • the terminal device falls back to the source cell for communication when it determines that the signal quality of the source cell meets condition #1; the terminal device determines that the signal quality of the source cell does not meet condition #1 , RRC connection re-establishment is performed.
  • the terminal device will use the configuration information #2 to re-establish the RRC connection when it determines that the signal quality of the source cell meets the condition #2; the terminal device determines that the signal quality of the source cell does not meet In condition #2, fall back to the source cell for communication, or use configuration information #1 to re-establish the RRC connection.
  • the terminal device determines that the signal quality of the source cell is better than condition #2, it falls back to the source cell for communication; when the terminal device determines that the signal quality of the source cell is worse than condition #2, it uses configuration information #1 to perform RRC The connection is re-established.
  • the terminal device uses configuration information #1 to re-establish the RRC connection when it determines that the signal quality of the source cell meets condition #3; the terminal device determines that the signal quality of the source cell does not meet In case of condition #3, fall back to the source cell for communication, or use configuration information #2 to re-establish the RRC connection.
  • the terminal device If the terminal device is pre-configured with the above conditions #1 and #2, the terminal device will fall back to the source cell for communication when it determines that the signal quality of the source cell meets condition #1; When condition #2, use configuration information #2 to perform RRC connection re-establishment; when the terminal device determines that the signal quality of the source cell does not meet condition #1 and condition #2, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device If the terminal device is pre-configured with the above conditions #1 and #3, the terminal device will fall back to the source cell for communication when it determines that the signal quality of the source cell meets condition #1; In case of condition #3, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device determines that the signal quality of the source cell satisfies condition #2, it uses configuration information #2 to perform RRC connection re-establishment; When the signal quality satisfies condition #3, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device will fall back to the source cell for communication when it determines that the signal quality of the source cell meets condition #1; the terminal device determines that the signal quality of the source cell meets the condition #1 When #2, use configuration information #2 to re-establish the RRC connection; when the terminal device determines that the signal quality of the source cell satisfies condition #3, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device if the signal quality of the source cell is good, it is a reasonable way for the terminal device to fall back to the source cell for communication to resume communication. Because it is easier for the terminal device to fall back to the source cell, and because the signal quality of the source cell is better, it will not affect the service data transmission of the terminal device. If the signal quality of the source cell is poor, it is a reasonable way for the terminal device to re-establish the RRC connection to resume communication. Therefore, for the above condition #1, a larger threshold can be set, so that the terminal device falls back to the source cell for communication when the signal quality of the source cell is better. For condition #2 and/or condition #3, a smaller threshold can be set, so that the terminal device re-establishes the RRC connection when the quality of the source cell is poor.
  • condition #1 includes that the signal quality of the source cell is greater than or equal to threshold #1
  • condition #2 includes that the signal quality of the source cell is greater than or equal to threshold #9, and less than or equal to threshold #10
  • condition # 3 includes that the signal quality of the source cell is less than or equal to threshold #3
  • the terminal device may first determine whether the signal quality of the source cell is greater than or equal to threshold #1 when selecting a communication recovery mode according to the signal quality of the source cell. If the signal quality of the source cell is greater than or equal to the threshold #1, the terminal device falls back to the source cell for communication.
  • the terminal device continues to judge whether the signal quality of the source cell is between the threshold #9 and the threshold #10. If the signal quality of the source cell is between the threshold #9 and the threshold #10, the terminal device uses the configuration information #2 to re-establish the RRC connection. If the signal quality of the source cell is not between the threshold value #9 and the threshold value #10, the terminal device continues to judge whether the signal quality of the source cell is less than the threshold value #3, if the signal quality of the source cell is less than the threshold value # 3. The terminal device uses the configuration information #1 to re-establish the RRC connection.
  • the terminal device can fall back to the source cell for communication or re-establish the RRC connection according to the signal quality of the source cell .
  • the terminal device performing DAPS handover fails to send the RRC reconfiguration complete message
  • the terminal device falls back to the source cell for communication or re-establishes the RRC connection according to the signal quality of the source cell, so that the terminal device can choose a more reasonable way to restore communication.
  • the signal quality of the source cell is good enough, the terminal device still resumes communication through the complicated RRC connection re-establishment process.
  • it will interrupt the communication of the user agent and affect the user experience; on the other hand, it will also cause the complexity of terminal device implementation. Increase the power consumption of terminal equipment. However, such communication interruption and power consumption could have been avoided or reduced. Therefore, according to the solution provided in this application, during the DAPS handover process, when the terminal device fails to send the RRC reconfiguration complete message, the terminal device can choose a more reasonable way to resume communication, which is conducive to improving user experience.
  • FIG. 5 shows a schematic flowchart of a communication method 500 provided by another embodiment of the present application.
  • the method 500 may include S510 to S540.
  • S510 to S530 are the same as S310 to S330 in the method 300, and for the sake of brevity, the embodiments of the present application will not describe them again.
  • the terminal device falls back to the source cell for communication, or performs RRC connection re-establishment.
  • re-establishing the RRC connection by the terminal device includes: using configuration information #1 to perform RRC connection re-establishment, or using configuration information #2 to perform RRC connection re-establishment. Therefore, S540 specifically includes: the terminal device falls back to the source cell for communication according to the signal quality of the target cell, or uses configuration information #1 to perform RRC connection re-establishment, or uses configuration information #2 to perform RRC connection re-establishment. Wherein, for the description about configuration information #1 and configuration information #2, reference may be made to S310 above.
  • condition #4 the signal quality of the target cell is greater than or equal to threshold #11 and less than or equal to threshold #12; or, the signal quality of the target cell If the signal quality is less than or equal to the threshold #2, the terminal device falls back to the source cell for communication.
  • condition #5 the signal quality of the target cell is less than or equal to threshold #6
  • the terminal device uses configuration information #2 to perform RRC connection re-establishment.
  • condition #6 the signal quality of the target cell is greater than or equal to threshold #13 and less than or equal to threshold #14; or, the target cell If the signal quality is greater than or equal to threshold #4, the terminal device uses configuration information #1 to re-establish the RRC connection.
  • the above conditions #1 to #3 may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • One or more of the above thresholds may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • Different threshold values in the foregoing threshold values may be the same or different, which is not limited in this embodiment of the present application.
  • This embodiment of the present application does not limit that the terminal device is pre-configured with one or more of the foregoing conditions #4 to #6.
  • the terminal device falls back to the source cell for communication when it determines that the signal quality of the target cell meets condition #4; the terminal device determines that the signal quality of the target cell does not meet condition #4 , RRC connection re-establishment is performed. For example, when the terminal device determines that the signal quality of the target cell is better than condition #4, it uses configuration information #1 to re-establish the RRC connection.
  • the terminal device uses configuration information #2 to re-establish the RRC connection when determining that the signal quality of the target cell meets condition #5; the terminal device determines that the signal quality of the target cell does not meet Condition #5, falling back to the source cell for communication, or using configuration information #1 to re-establish the RRC connection. For example, when the terminal device determines that the signal quality of the target cell is better than condition #5, it uses configuration information #1 to re-establish the RRC connection.
  • the terminal device uses configuration information #1 to re-establish the RRC connection when it determines that the signal quality of the target cell meets condition #6; the terminal device determines that the signal quality of the source cell does not meet In condition #6, fall back to the source cell for communication, or use configuration information #2 to re-establish the RRC connection.
  • the terminal device If the terminal device is pre-configured with the above conditions #4 and #5, the terminal device will fall back to the source cell for communication when it determines that the signal quality of the target cell meets condition #4; When condition #5, use configuration information #2 to perform RRC connection re-establishment; when the terminal device determines that the signal quality of the target cell does not meet condition #4 and condition #5, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device If the terminal device is pre-configured with the above conditions #4 and #6, the terminal device will fall back to the source cell for communication when it determines that the signal quality of the target cell meets condition #4; In case of condition #6, RRC connection re-establishment is performed using configuration information #1.
  • the terminal device determines that the signal quality of the target cell satisfies the condition #5, it uses configuration information #2 to perform RRC connection re-establishment; When the signal quality satisfies condition #6, use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device falls back to the source cell for communication when it determines that the signal quality of the target cell meets condition #4; the terminal device determines that the signal quality of the target cell satisfies the condition When #5, use the configuration information #2 to re-establish the RRC connection; when the terminal device determines that the signal quality of the target cell satisfies the condition #6, use the configuration information #1 to perform the RRC connection re-establishment.
  • the terminal device re-establish the RRC connection by using the configuration information #1. Because when the signal quality of the target cell is relatively good, it is easier for the terminal device to select a high-quality cell when re-establishing the RRC connection using the configuration information #1. If the signal quality of the target cell is poor, it is a reasonable way for the terminal device to fall back to the source cell for communication or to use configuration information #2 to re-establish the RRC connection. Therefore, for the above condition #4/condition #5, a smaller threshold value can be set so that the terminal device falls back to the source cell for communication or uses configuration information #2 for communication when the signal quality of the target cell is poor. The RRC connection is re-established. For condition #6, a larger threshold can be set, so that the terminal device uses configuration information #1 to re-establish the RRC connection when the quality of the target cell is better.
  • condition #4 includes that the signal quality of the target cell is less than or equal to threshold #2
  • condition #6 includes that the signal quality of the target cell is greater than or equal to threshold #4
  • the terminal device may first determine whether the signal quality of the target cell is greater than or equal to threshold #4 when selecting a way to resume communication according to the signal quality of the target cell. If the signal quality of the target cell is greater than or equal to the threshold #4, the terminal device uses the configuration information #1 to re-establish the RRC connection. If the signal quality of the target cell is less than or equal to the threshold #2, the terminal device falls back to the source cell for communication.
  • the terminal device performing DAPS handover fails to send the RRC reconfiguration complete message
  • the terminal device falls back to the source cell for communication according to the signal quality of the target cell, or performs RRC connection re-establishment, so that the terminal device can Choose a more reasonable way to restore communication.
  • the signal quality of the target cell is good enough
  • the terminal equipment uses the configuration information #2 to perform the RRC connection re-establishment process to resume communication, it is not easy to select a high-quality cell. Therefore, according to the solution provided in this application, during the DAPS handover process, when the terminal device fails to send the RRC reconfiguration complete message, the terminal device can choose a more reasonable way to resume communication, which is conducive to improving user experience.
  • FIG. 6 shows a schematic flowchart of a communication method 600 provided by another embodiment of the present application.
  • the method 600 may include S610 to S640.
  • S610 to S630 are the same as S310 to S330 in the method 300, and for the sake of brevity, details are not repeated in this embodiment of the present application.
  • the terminal device falls back to the source cell for communication, or performs RRC connection re-establishment. It can also be said that the terminal device compares the signal quality of the source cell with the signal quality of the target cell, falls back to the source cell for communication, or performs RRC connection re-establishment.
  • re-establishing the RRC connection by the terminal device includes: using configuration information #1 to perform RRC connection re-establishment, or using configuration information #2 to perform RRC connection re-establishment. Therefore, S640 specifically includes: the terminal device falls back to the source cell for communication according to the signal quality of the source cell and the signal quality of the target cell, or uses configuration information #1 to perform RRC connection re-establishment, or uses configuration information #2 to perform RRC connection re-establishment The RRC connection is re-established. Wherein, for the description about configuration information #1 and configuration information #2, reference may be made to S310 above.
  • condition #7 the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the signal quality of the source cell minus The signal quality difference of the target cell is greater than or equal to threshold #15 and less than or equal to threshold #16; the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to the threshold Value #17; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the target cell is less than or equal to the threshold #18, then the terminal device falls back to the source cell for communication.
  • condition #8 the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the signal quality of the source cell decreases The difference of signal quality to the target cell is greater than or equal to threshold #19 and less than or equal to threshold #20; the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to the threshold Limit #21; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the target cell is less than or equal to the threshold #22, then the terminal device uses configuration information #2 to perform RRC connection re-establishment.
  • condition #9 the signal quality of the target cell is greater than the signal quality of the source cell, and/or, the signal quality of the target cell minus the signal quality of the source cell The difference is greater than or equal to threshold #23, and less than or equal to threshold #24; the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the target cell is greater than or equal to threshold #25; or , the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the source cell is less than or equal to the threshold #26, then the terminal device uses the configuration information #1 to perform RRC connection re-establishment.
  • condition #9 the signal quality of the target cell is greater than the signal quality of the source cell, and/or, the signal quality of the target cell minus the signal quality of the source cell The difference is greater than or equal to threshold #23, and less than or equal to threshold #24; the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the target cell is greater than or equal
  • the above conditions #7 to #9 may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • One or more of the above threshold values #15 to threshold value 26 may be predefined by the protocol, or preconfigured, or indicated by the network device to the terminal device, which is not discussed in this embodiment of the present application. Do limited. Different threshold values among the aforementioned threshold value #15 to threshold value #26 may be the same or different, which is not limited in this embodiment of the present application.
  • This embodiment of the present application does not limit that the terminal device is pre-configured with one or more of the foregoing conditions #1 to #3.
  • the terminal device If the terminal device is pre-configured with the above condition #7, the terminal device will fall back to the source cell for communication when determining that the signal quality of the source cell and the signal quality of the target cell meet condition #7; When the quality and the signal quality of the target cell do not meet condition #7, RRC connection re-establishment is performed. For example, when the terminal device determines that the signal quality of the target cell is better than that of the source cell, it uses configuration information #1 to re-establish the RRC connection.
  • the terminal device uses configuration information #2 to re-establish the RRC connection when determining that the signal quality of the source cell and the signal quality of the target cell meet the condition #8; When the signal quality of the cell and the signal quality of the target cell do not meet condition #8, fall back to the source cell for communication, or use configuration information #1 to perform RRC connection re-establishment. For example, when the terminal device determines that the signal quality of the target cell is better than that of the source cell, it uses configuration information #1 to re-establish the RRC connection.
  • the terminal device uses configuration information #1 to re-establish the RRC connection when determining that the signal quality of the source cell and the signal quality of the target cell meet the condition #9; When the signal quality of the cell and the signal quality of the target cell do not meet condition #9, fall back to the source cell for communication, or use configuration information #2 to perform RRC connection re-establishment.
  • the terminal device will fall back to the source cell for communication when determining that the signal quality of the source cell and the signal quality of the target cell meet condition #7;
  • the signal quality of the source cell and the signal quality of the target cell meet condition #8 use configuration information #2 to perform RRC connection re-establishment;
  • the terminal device determines that the signal quality of the source cell and the signal quality of the target cell do not meet condition #1 and condition For #2, use the configuration information #1 to re-establish the RRC connection.
  • the terminal device will fall back to the source cell for communication when determining that the signal quality of the source cell and the signal quality of the target cell meet condition #7;
  • the signal quality of the source cell and the signal quality of the target cell meet condition #9 use configuration information #1 to perform RRC connection re-establishment.
  • the terminal device determines that the signal quality of the source cell and the signal quality of the target cell meet the condition #8, it uses configuration information #2 to perform RRC connection re-establishment; the terminal When the device determines that the signal quality of the source cell and the signal quality of the target cell meet condition #9, it uses configuration information #1 to perform RRC connection re-establishment.
  • the terminal device will fall back to the source cell for communication when determining that the signal quality of the source cell and the signal quality of the target cell meet condition #7;
  • the signal quality of the cell and the signal quality of the target cell meet condition #8 use configuration information #2 to re-establish the RRC connection;
  • the terminal device determines that the signal quality of the source cell and the signal quality of the target cell meet condition #3, use configuration information #2 Message #1 performs RRC connection re-establishment.
  • the terminal device can compare the signal quality of the source cell and the signal quality of the target cell, and fall back to the source cell for communication. Or perform RRC connection re-establishment.
  • the terminal device performing DAPS handover fails to send the RRC reconfiguration complete message
  • the terminal device falls back to the source cell for communication or performs RRC connection reconfiguration according to the signal quality of the source cell and the signal quality of the target cell. Established so that the terminal device can choose a more reasonable way to resume communication.
  • the signal quality of the source cell is better than the signal quality of the target cell
  • the terminal device still resumes communication through the complicated RRC connection re-establishment process.
  • it will interrupt the communication of the user agent and affect the user experience;
  • the complexity of implementation increases the power consumption of terminal equipment. However, such communication interruption and power consumption could have been avoided or reduced. Therefore, according to the solution provided in this application, during the DAPS handover process, when the terminal device fails to send the RRC reconfiguration complete message, the terminal device can choose a more reasonable way to resume communication, which is conducive to improving user experience.
  • FIG. 7 is a schematic flowchart of a communication method 700 provided by an embodiment of the present application from the perspective of device interaction. As shown in FIG. 7 , the method 700 may include S710 to S730. Wherein, S710 to S720 are the same as S310 to S320 in the method 300, and for the sake of brevity, details are not repeated in this embodiment of the present application.
  • the terminal device sends indication information.
  • network device #2 receives indication information.
  • the indication information is used to indicate the failure to access the target cell, or the indication information is used to indicate the failure to send the RRC reconfiguration complete message when accessing the target cell, or the indication information is used to indicate the failure to send the RRC reconfiguration complete message.
  • Network device #2 is the network device to which the source cell belongs.
  • the indication information may be carried in a failure information message (FAILURE INFORMATION MESSAGE), or the indication information may be carried in the first message.
  • FAILURE INFORMATION MESSAGE failure information message
  • the first message may be an RRC message, a MAC message, a PHY message, etc., which is not limited in this embodiment of the present application.
  • S730 includes: when the terminal device determines that sending the RRC reconfiguration complete message fails, sending indication information to network device #2. Specifically, for the description of how the terminal device determines that sending the RRC reconfiguration complete message fails, reference may be made to S330 above.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, the terminal device sends indication information to network device #2, indicating that the terminal device determines to fall back to the source cell for communication, that is, the terminal device The device continues to communicate with network device #2 through the connection with the source cell.
  • S730 includes: when the terminal device determines that sending the RRC reconfiguration complete message fails, sending indication information to network device #2 according to the signal quality of the source cell and/or the signal quality of the target cell.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, the terminal device sends indication information to network device #2 according to the signal quality of the source cell.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the first condition, the terminal device sends indication information to network device #2.
  • the first condition includes: the signal quality of the source cell is greater than or equal to threshold #7 and less than or equal to threshold #8; or, the signal quality of the source cell is greater than or equal to threshold #1.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, the terminal device sends indication information to network device #2 according to the signal quality of the target cell.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell satisfies the second condition, the terminal device sends indication information to network device #2.
  • the second condition includes: the signal quality of the target cell is greater than or equal to threshold #11 and less than or equal to threshold #12; or, the signal quality of the target cell is less than or equal to threshold #2.
  • the terminal device determines whether to send indication information to network device #2 according to the signal quality of the source cell and the signal quality of the target cell.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell and the signal quality of the source cell meet the third condition, the terminal device sends indication information to the network device #2.
  • the third condition includes: the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the difference between the signal quality of the source cell and the signal quality of the target cell is greater than or equal to threshold #15, and less than or Equal to the threshold value #16; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to the threshold value #17; or, the signal quality of the source cell is greater than the signal quality of the target cell, And the signal quality of the target cell is less than or equal to the threshold #18.
  • first to third conditions above may be predefined by the protocol, or pre-configured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • the foregoing threshold value may be predefined by the protocol, or pre-configured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application. And different threshold values in the foregoing threshold values may be the same or different, which is not limited in this embodiment of the present application.
  • the terminal device after the terminal device performing DAPS handover successfully accesses the target cell, if it determines that sending the RRC reconfiguration complete message fails, the terminal device sends indication information to the network device to which the source cell belongs, and falls back to the source cell. The cell communicates. Since it is more convenient for the terminal device to fall back to the source cell, according to the embodiment of the present application, the terminal device can quickly resume communication.
  • the terminal device sends indication information to the network device to which the source cell belongs, it takes into account the signal quality of the source cell and/or the signal quality of the target cell, which is beneficial to ensure the service continuity and reliability of the terminal device.
  • FIG. 8 is a schematic flowchart of a communication method 800 provided by an embodiment of the present application from the perspective of device interaction.
  • the method 800 may include S810 to S840.
  • S810 to S820 are the same as S310 to S320 in the method 300, and for the sake of brevity, the embodiment of the present application will not repeat them again.
  • configuration information #1 and configuration information #2 reference may be made to S310 above.
  • S330 For the description of how the terminal device determines that sending the RRC reconfiguration complete message fails, reference may be made to S330 above.
  • S830 includes: when the terminal device determines that sending the RRC reconfiguration complete message fails, release the configuration information #2 according to the signal quality of the source cell and/or the signal quality of the target cell, and determine the RRC reconfiguration information according to the configuration information #1. Build request message.
  • S830 includes: when the terminal device determines that sending the RRC reconfiguration complete message fails, release the configuration information #1 according to the signal quality of the source cell and/or the signal quality of the target cell, and determine the RRC re-establishment request according to the configuration information #2 information.
  • the terminal device determines to release the configuration information #2 according to the signal quality of the source cell, or releases the configuration information #1 according to the signal quality of the source cell .
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the fourth condition, the terminal device releases configuration information #2.
  • the fourth condition includes: the signal quality of the source cell is less than or equal to the threshold #3.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the fourth condition, the terminal device releases configuration information #2, and performs RRC connection re-establishment according to configuration information #1.
  • RRC connection re-establishment performed by the terminal device according to the configuration information #1, reference may be made to S340b above.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the seventh condition, the terminal device releases the configuration information #1.
  • the seventh condition includes: the signal quality of the source cell is greater than or equal to threshold #9 and less than or equal to threshold #10; or, the signal quality of the source cell is less than or equal to threshold #5.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the seventh condition, the terminal device performs RRC connection re-establishment according to the release configuration information #1 and according to the configuration information #2.
  • RRC connection re-establishment performed by the terminal device according to configuration information #2, reference may be made to S340b above.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, the terminal device determines to release configuration information #2 according to the signal quality of the target cell, or releases the configuration information according to the signal quality of the target cell #1.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell satisfies the fifth condition, the terminal device releases configuration information #2.
  • the fifth condition includes: the signal quality of the target cell is greater than or equal to threshold #13 and less than or equal to threshold #14; or, the signal quality of the target cell is greater than or equal to threshold #4.
  • the terminal device determines that sending the RRC reconfiguration complete message fails and the signal quality of the target cell satisfies the fifth condition, the terminal device releases configuration information #2 and performs RRC connection re-establishment according to configuration information #1.
  • RRC connection re-establishment performed by the terminal device according to the configuration information #1, reference may be made to S340b above.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the eighth condition, the terminal device releases the configuration information #1.
  • the eighth condition includes: the signal quality of the target cell is less than or equal to the threshold #6.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the source cell satisfies the eighth condition, the terminal device releases configuration information #1, and performs RRC connection re-establishment according to configuration information #2.
  • RRC connection re-establishment performed by the terminal device according to configuration information #2, reference may be made to S340b above.
  • the terminal device determines to release configuration information #2 according to the signal quality of the source cell and the signal quality of the target cell, or, according to the The signal quality of the target cell and the signal quality of the target cell release configuration information #1.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell and the signal quality of the source cell meet the sixth condition, the terminal device releases configuration information #2.
  • the sixth condition includes: the signal quality of the target cell is greater than the signal quality of the source cell, and/or, the difference between the signal quality of the target cell and the signal quality of the source cell is greater than or equal to threshold #23, and less than or equal to threshold #24; or, the signal quality of the target cell is greater than the signal quality of the source cell, and the signal quality of the target cell is greater than or equal to threshold #25; or, the signal quality of the target cell is greater than the signal quality of the source cell, And the signal quality of the source cell is less than or equal to the threshold #26.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell and the signal quality of the source cell meet the sixth condition, the terminal device releases configuration information #2, and performs RRC according to configuration information #1.
  • the connection is re-established.
  • the terminal device when the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell and the signal quality of the source cell meet the ninth condition, the terminal device releases the configuration information #1.
  • the ninth condition includes: the signal quality of the source cell is greater than the signal quality of the target cell, and/or, the difference between the signal quality of the source cell and the signal quality of the target cell is greater than or equal to threshold #19, and less than or equal to threshold #20; or, the signal quality of the source cell is greater than the signal quality of the target cell, and the signal quality of the source cell is greater than or equal to threshold #21; or, the signal quality of the source cell is greater than the signal quality of the target cell, And the signal quality of the target cell is less than or equal to the threshold #22.
  • the terminal device determines that sending the RRC reconfiguration complete message fails, and the signal quality of the target cell and the signal quality of the source cell meet the ninth condition, the terminal device releases the configuration information #1, and performs RRC according to the configuration information #2.
  • the connection is re-established.
  • the fourth to ninth conditions above may be predefined by the protocol, or pre-configured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application.
  • the foregoing threshold value may be predefined by the protocol, or pre-configured, or indicated by the network device to the terminal device, which is not limited in this embodiment of the present application. And different threshold values in the foregoing threshold values may be the same or different, which is not limited in this embodiment of the present application.
  • the terminal device sends an RRC re-establishment request message.
  • network device #3 receives the RRC re-establishment request message.
  • the RRC re-establishment request message is determined according to configuration information #1 or configuration information #2.
  • configuration information #1 or configuration information #2.
  • the RRC re-establishment request message please refer to the above S3403a/S3403b/S3403c/S3403d.
  • the network device #3 is the network device to which the first cell belongs, and the first cell is the cell where the terminal device initiates RRC re-establishment.
  • the first cell is the cell where the terminal device initiates RRC re-establishment.
  • S840 includes: when the terminal device determines that sending the RRC reconfiguration complete message fails, sending an RRC re-establishment request message to network device #3.
  • the terminal device after the terminal device performing DAPS handover successfully accesses the target cell, if it is determined that sending the RRC reconfiguration complete message fails, the terminal device can perform RRC connection re-establishment according to configuration information #1 or configuration information #2 , thereby restoring communication.
  • the terminal device sends the RRC re-establishment request message to the network device #3, it considers the signal quality of the source cell and/or the signal quality of the target cell, which is beneficial to ensure the service continuity and reliability of the terminal device.
  • the terminal device and/or the network device may perform some or all of the steps in the embodiments. These steps or operations are merely examples, and other operations or modifications of various operations may also be performed in the embodiment of the present application.
  • each step may be performed in a different order presented in each embodiment, and it may not be necessary to perform all operations in the embodiment of the present application.
  • sequence number of each step does not mean the order of execution, the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.
  • Fig. 9 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1000 may include a processing unit 1100 and a transceiver unit 1200 .
  • the communication apparatus 1000 may correspond to the terminal device in the above method embodiment, for example, may be a terminal device, or a component (such as a chip or a chip system, etc.) configured in the terminal device.
  • the communication device 1000 may correspond to the terminal device in the methods 300 to 800 according to the embodiment of the present application, and the communication device 1000 may include a terminal device for performing the methods 300 to 800 in FIGS.
  • the unit of the method each unit and the above-mentioned other operations and/or functions in the communication device 1000 are respectively for realizing the corresponding processes of the method 300 to the method 800 in FIG. 3 to FIG. 8 .
  • the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.
  • the transceiver unit 1200 in the communication device 1000 can be implemented through an input/output interface, and the processing unit 1100 in the communication device 1000 can be implemented through the chip or chip Implementations such as processors, microprocessors, or integrated circuits integrated on a system.
  • the communication apparatus 1000 may correspond to the network device in the above method embodiment, for example, may be a network device, or a component (such as a chip or a chip system, etc.) configured in the network device.
  • the communication device 1000 may correspond to network device #1 in the methods 300 to 800 according to the embodiment of the present application, and the communication device 1000 may include a network device for performing the methods 300 to 800 in FIGS. 3 to 8 The unit of the method performed by device #1.
  • each unit and the above-mentioned other operations and/or functions in the communication device 1000 are respectively for realizing the corresponding processes of the method 300 to the method 800 in FIG. 3 to FIG. 8 . It should be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.
  • the communication apparatus 1000 may correspond to network device #2 in the methods 300 and 700 according to the embodiments of the present application, and the communication apparatus 1000 may include a Elements of the method performed by network device #2.
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding flow of the method 300 in FIG. 3 or the method 700 in FIG. 7 . It should be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.
  • the communication device 1000 may correspond to network device #3 in the methods 300 and 800 according to the embodiments of the present application, and the communication device 1000 may include a device for executing the method 300 in FIG. 3 or the method 800 in FIG. Elements of the method performed by network device #3.
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding flow of the method 300 in FIG. 3 or the method 800 in FIG. 8 . It should be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.
  • the transceiver unit 1200 in the communication device 1000 can be implemented through an input/output interface, and the processing unit 1100 in the communication device 1000 can be implemented through the chip or chip Implementations such as processors, microprocessors, or integrated circuits integrated on a system.
  • Fig. 10 is a schematic block diagram of a communication device according to another embodiment of the present application.
  • the communication device 2000 shown in FIG. 10 may include: a memory 2100 , a processor 2200 , and a communication interface 2300 .
  • the memory 2100, the processor 2200, and the communication interface 2300 are connected through an internal connection path, the memory 2100 is used to store instructions, and the processor 2200 is used to execute the instructions stored in the memory 2100 to control the input/output interface to receive/send messages arts.
  • the memory 2100 may be coupled with the processor 2200 through an interface, or may be integrated with the processor 2200 .
  • the above-mentioned communication interface 2300 uses a transceiver device such as but not limited to a transceiver to implement communication between the communication device 2000 and other devices or communication networks.
  • the above-mentioned communication interface 2300 may also include an input/output interface (input/output interface).
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor 2200 or instructions in the form of software.
  • the methods disclosed in the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register.
  • the storage medium is located in the memory 2100, and the processor 2200 reads the information in the memory 2100, and completes the steps of the above method in combination with its hardware. To avoid repetition, no detailed description is given here.
  • the processor may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processor, DSP), dedicated integrated Circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the memory may include a read-only memory and a random access memory, and provide instructions and data to the processor.
  • a portion of the processor may also include non-volatile random access memory.
  • the processor may also store device type information.
  • FIG. 11 is a schematic diagram of a chip system according to an embodiment of the present application.
  • the chip system here may also be a system composed of circuits.
  • the chip system 3000 shown in FIG. 11 includes: a logic circuit 3100 and an input/output interface (input/output interface) 3200, the logic circuit is used to couple with the input interface, and transmit data through the input/output interface (for example, the first instruction information) to execute the methods described in FIG. 3 to FIG. 8 .
  • the embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the method in any one of the above method embodiments.
  • the above processing device may be one or more chips.
  • the processing device may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC), or a system chip (system on chip, SoC). It can be a central processor unit (CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller unit) , MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processor
  • microcontroller micro controller unit
  • PLD programmable logic device
  • each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, no detailed description is given here.
  • the processor in the embodiment of the present application may be an integrated circuit chip, which has a signal processing capability.
  • each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components .
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories.
  • the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM), which acts as external cache memory.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM direct memory bus random access memory
  • direct rambus RAM direct rambus RAM
  • the present application also provides a computer program product, the computer program product including: computer program code, when the computer program code is run on the computer, the computer is made to execute the computer program described in Fig. 3 to Fig. 8 .
  • the present application also provides a computer-readable storage medium, the computer-readable storage medium stores program codes, and when the program codes are run on a computer, the computer is made to execute The method performed by the terminal device or the network device (network device #1 and/or network device #2 and/or network device #3) in the embodiment shown in 8.
  • the present application also provides a system, which includes the aforementioned one or more terminal devices and/or network devices (network device #1 and/or network device #2 and/or network device # 3).
  • the terminal equipment in the above-mentioned various apparatus embodiments completely corresponds to the terminal equipment in the method embodiments
  • the terminal equipment in the above-mentioned various apparatus embodiments completely corresponds to the terminal equipment in the method embodiments, and corresponding steps are performed by corresponding modules or units
  • a transceiver unit performs the steps of receiving or sending in the method embodiments, and other steps except sending and receiving may be performed by a processing unit (processor).
  • processor For the functions of the specific units, reference may be made to the corresponding method embodiments. Wherein, there may be one or more processors.
  • a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be components.
  • One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • a component may, for example, be based on a signal having one or more packets of data (e.g., data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet via a signal interacting with other systems). Communicate through local and/or remote processes.
  • packets of data e.g., data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet via a signal interacting with other systems.
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • each functional unit may be fully or partially implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer instructions (programs). When the computer program instructions (program) are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) etc.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a high-density digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state disk (solid state disk, SSD)
  • the functions are realized in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the computer software product is stored in a storage medium and includes several instructions to make a A computer device (which may be a personal computer, a server, or a network device, etc.) executes all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

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Abstract

La présente demande concerne un procédé de communication et un appareil de communication. Le procédé est appliqué à un dispositif terminal. Le procédé consiste à : au cours du processus d'exécution d'un transfert DAPS, exécuter avec succès un accès aléatoire dans une cellule cible ; envoyer un message de fin de reconfiguration commande de ressource radio (RRC) à un dispositif réseau auquel appartient la cellule cible ; et lorsqu'il est déterminé que l'envoi du message de fin de reconfiguration RRC échoue, envoyer des informations d'indication à un dispositif réseau auquel appartient une cellule source. D'après la présente demande, après que le dispositif terminal effectuant le transfert DAPS n'a pas réussi à envoyer le message de fin de reconfiguration RRC, le dispositif terminal peut récupérer rapidement une communication.
PCT/CN2021/105983 2021-07-13 2021-07-13 Procédé de communication et appareil de communication WO2023283803A1 (fr)

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CN202180083759.9A CN116636256A (zh) 2021-07-13 2021-07-13 通信方法及通信装置

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Citations (4)

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CN105704769A (zh) * 2016-04-01 2016-06-22 京信通信技术(广州)有限公司 基站内小区间切换的方法及系统
CN112312487A (zh) * 2019-07-31 2021-02-02 华为技术有限公司 通信方法和通信装置
WO2021095825A1 (fr) * 2019-11-13 2021-05-20 シャープ株式会社 Dispositif terminal, dispositif de station de base, et procédé
US20210211956A1 (en) * 2020-01-06 2021-07-08 Samsung Electronics Co., Ltd. Method and apparatus for configuring fallback for each bearer when daps handover fails in next-generation mobile communication system

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN105704769A (zh) * 2016-04-01 2016-06-22 京信通信技术(广州)有限公司 基站内小区间切换的方法及系统
CN112312487A (zh) * 2019-07-31 2021-02-02 华为技术有限公司 通信方法和通信装置
WO2021095825A1 (fr) * 2019-11-13 2021-05-20 シャープ株式会社 Dispositif terminal, dispositif de station de base, et procédé
US20210211956A1 (en) * 2020-01-06 2021-07-08 Samsung Electronics Co., Ltd. Method and apparatus for configuring fallback for each bearer when daps handover fails in next-generation mobile communication system

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Title
HUAWEI, HISILICON, CHINA TELECOM CORPORATION LTD.: "Correction to NR TC 8.1.4.3.1-DAPS handover Success", 3GPP DRAFT; R5-213554, vol. RAN WG5, 28 May 2021 (2021-05-28), pages 1 - 11, XP052016516 *

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