WO2023109861A1 - 提前同步的方法和通信装置 - Google Patents

提前同步的方法和通信装置 Download PDF

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Publication number
WO2023109861A1
WO2023109861A1 PCT/CN2022/138987 CN2022138987W WO2023109861A1 WO 2023109861 A1 WO2023109861 A1 WO 2023109861A1 CN 2022138987 W CN2022138987 W CN 2022138987W WO 2023109861 A1 WO2023109861 A1 WO 2023109861A1
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WIPO (PCT)
Prior art keywords
terminal device
cell
access network
message
target cell
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PCT/CN2022/138987
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English (en)
French (fr)
Inventor
胡锦娜
马川
吴亚琦
吴恒恒
邹志强
马霓
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华为技术有限公司
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Publication of WO2023109861A1 publication Critical patent/WO2023109861A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of computers, and in particular to a method and communication device for advance synchronization.
  • One of the common energy saving methods is to make the cell dormant when there is no load or light load. Through the multiplexing of antennas, the coverage of the cell can be expanded, so that the impact of the dormancy behavior of other cells on the coverage is greatly reduced, and the dormancy opportunities of the cell under medium and light loads are increased.
  • the embodiment of the present application discloses an advance synchronization method and a communication device.
  • a terminal device completes uplink and downlink synchronization before a network device initiates a cell handover to it, which can reduce the time delay of cell handover.
  • the embodiment of the present application provides a method for advance synchronization, the method includes: a terminal device receives a first message from a first access network device; the first message is used by the terminal device to obtain the terminal The timing advance (timing advance, TA) of the device in the target cell, the target cell does not belong to the cell currently accessed by the terminal device; the terminal device sends a second message to the first access network device; the The second message indicates that the terminal device has completed configuration of the target cell.
  • the first access network device may belong to an entity corresponding to a cell currently accessed by the terminal device.
  • the target cell may belong to a cell to be accessed by the terminal device currently. It can be understood that the terminal device is to be handed over from the currently accessed cell to the target cell.
  • the terminal device receives the first message from the first access network device.
  • the terminal device can obtain its TA in the target cell according to the first message, and then complete uplink synchronization in advance, which can reduce the time delay of cell handover.
  • the first message is a radio resource control (radio resource control, RRC) reconfiguration message
  • the second message is an RRC reconfiguration complete message.
  • RRC radio resource control
  • the RRC reconfiguration (RRCReconfiguration) message is used for the terminal equipment to obtain its TA in the target cell.
  • the terminal device can complete uplink synchronization before accessing the target cell, that is, complete uplink synchronization in advance.
  • the first message is RRCReconfiguration, which can be better compatible with existing signaling.
  • the terminal device sends an RRC reconfiguration complete message (RRCReconfigurationComplete) to the first access network device to notify the first access network device that the terminal device has completed the configuration of the target cell.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can quickly and accurately obtain the TA of the target cell and/or configuration information of the target cell according to the first message.
  • the method before the terminal device receives the first message from the first access network device, the method further includes: the terminal device receiving the first indication from the first access network device Information and second indication information, the first indication information instructs the terminal device to perform synchronization-related operations on the target cell, and the second indication information indicates the available time and frequency for the terminal device to send uplink signals to the target cell resource.
  • the terminal device receives the first indication information and the second indication information from the first access network device, so as to perform synchronization-related operations on the target cell in a timely manner, and obtain the information available for sending uplink signals to the target cell. time-frequency resources.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same message; signaling overhead can be saved.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information and the second indication information are carried in different messages. Since the first indication information and the second indication information have different functions and formats, the first indication information and the second indication information are more suitable to be carried in different messages.
  • the first indication information is carried in an RRC reconfiguration message, a media access control (media access control, MAC) control element (control element, CE), a downlink control information (downlink control information, DCI ), the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI.
  • media access control media access control
  • CE control element
  • DCI downlink control information
  • the first indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI;
  • the second indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI; by using the existing
  • the signaling carries the first indication information and the second indication information, reducing the impact on the existing communication system.
  • the target cell before the terminal device receives the first indication information, the target cell has completed synchronous beam coverage.
  • the target cell has completed synchronous beam coverage.
  • the terminal device before the terminal device receives the first indication information, the synchronization beam coverage of the target cell has been completed, but the coverage of the target cell has not been completed.
  • the terminal device Since the terminal device has completed the synchronization beam coverage of the target cell before receiving the first indication information, the terminal device can perform synchronization-related operations in advance when the coverage of the target cell is not completed, so as to reduce the delay of cell handover.
  • the method further includes: the terminal device detects a synchronization signal of the target cell to complete downlink synchronization; the terminal device sends a first uplink signal to the target cell according to the second indication information, and the second An uplink signal is used to determine the TA of the terminal device in the target cell.
  • the terminal device before the terminal device receives the first message from the first access network device, it detects the synchronization signal of the target cell to complete the downlink synchronization and sends the first uplink signal to the target cell, which can be completed before configuring the target cell. Uplink and downlink synchronization, thereby reducing the delay of cell switching.
  • the terminal device sending the first uplink signal to the target cell according to the second indication information includes: the terminal device using the time-frequency resource indicated by the second indication information, Sending a first uplink signal to the target cell.
  • the terminal device uses the time-frequency resource indicated by the second indication information to send the first uplink signal to the target cell, so that the target cell can accurately receive the first uplink signal.
  • any operation performed by the target cell may be understood as an operation performed by an entity corresponding to the target cell.
  • the target cell refers to a cell to be configured by the terminal device (or a cell to be accessed).
  • the method before the terminal device sends the second message to the first access network device, the method further includes: the terminal device acquires the In the TA of the target cell, and complete the configuration of the target cell.
  • the completion of configuration of the target cell by the terminal device may be regarded as the handover of the terminal device to the target cell.
  • the terminal device obtains the TA of the target cell and completes the configuration of the target cell; the uplink synchronization can be completed faster, thereby reducing the time for cell handover delay.
  • the first message further includes third indication information, where the third indication information is used to indicate a condition for the terminal device to switch to the target cell.
  • the third indication information is used to indicate the conditions for the terminal equipment to switch to the target cell.
  • the terminal device needs to be switched, it is not necessary for the network to send a switching signaling trigger to the terminal, which can reduce signaling overhead.
  • the method further includes: the terminal evaluates the condition; if the condition is satisfied, the terminal device performs cell switch.
  • the terminal device when the conditions are met, performs cell switching according to the TA of the terminal device in the target cell; the cell switching can be performed in time, and signaling overhead can be saved.
  • the conditions include one or more of the following: the signal quality of the cell currently accessed by the terminal device measured by the terminal device is lower than a first threshold; the target measured by the terminal device The signal quality of the cell is higher than or equal to the second threshold.
  • the fact that the condition is met includes receiving information indicating that the condition is met.
  • the embodiment of the present application provides another method for early synchronization, which includes: the terminal device receives an RRC reconfiguration message from the first access network device; the RRC reconfiguration message is used by the terminal device to obtain The terminal device is in the TA of the target cell, and the target cell does not belong to the cell currently accessed by the terminal device; the terminal device sends an RRC reconfiguration complete message to the first access network device; the RRC reconfiguration The configuration completion message indicates that the terminal device has completed the configuration of the target cell.
  • the terminal device receives the RRC reconfiguration message from the first access network device.
  • the RRC reconfiguration message of the terminal device can obtain the TA of the terminal device in the target cell, and the uplink synchronization can be completed in advance, thereby reducing the delay of cell handover.
  • the RRC reconfiguration message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can accurately and quickly obtain the TA of the terminal device in the target cell and/or configuration information of the target cell according to the RRC reconfiguration message.
  • the embodiment of the present application provides another communication method, which includes: the terminal device receives first instruction information from the first access network device, and the first instruction information instructs the terminal device to perform synchronization-related operations ; the terminal device performs synchronization-related operations in the target cell according to the first indication information; the terminal device receives a first message from the first access network device after completing synchronization-related operations; the first The message is used for the terminal device to obtain the TA of the target cell.
  • the terminal device receives the first message from the first access network device after completing synchronization-related operations. That is to say, the terminal device has already completed synchronization-related operations before obtaining the configuration information of the target cell, so the terminal device can reduce the time delay caused by uplink and downlink synchronization by completing the configuration of the target cell (or implementing cell switching).
  • the performing a synchronization-related operation on the target cell by the terminal device according to the first indication information includes: detecting a synchronization signal of the target cell by the terminal device to complete downlink synchronization.
  • the terminal device before the terminal device receives the first message from the first access network device, it detects the synchronization signal of the target cell to complete the downlink synchronization, and can complete the downlink synchronization before receiving the first message, thereby reducing the cost of cell handover delay.
  • the method before the terminal device receives the first message from the first access network device, the method further includes: the terminal device receiving a second indication from the first access network device information, the second indication information indicates the time-frequency resources available for the terminal device to send an uplink signal to the target cell; the terminal device sends a first uplink signal to the target cell according to the second indication information, The first uplink signal is used to determine the TA of the terminal device in the target cell.
  • the terminal device sends the first uplink signal to the target cell before receiving the first message from the first access network device.
  • the time delay of cell handover can be reduced.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same message; signaling overhead can be saved.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information and the second indication information are carried in different messages. Since the first indication information and the second indication information have different functions and formats, the first indication information and the second indication information are more suitable to be carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the first indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI;
  • the second indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI by using the existing Signaling is used to carry the first indication information, so as to reduce the impact on the existing communication system.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can accurately and quickly obtain the TA of the terminal device in the target cell and/or configuration information of the target cell according to the first message.
  • the embodiment of the present application provides another method for advance synchronization, including: the first access network device sends a first message to the terminal device; the first message is used by the terminal device to obtain The TA of the target cell, where the target cell does not belong to the cell currently accessed by the terminal device; the first access network device receives a second message from the terminal device, and the second message indicates that the terminal device The configuration of the target cell has been completed.
  • the first access network device may belong to an entity corresponding to a cell currently accessed by the terminal device.
  • the first message is used for the terminal device to obtain the TA of the terminal device in the target cell.
  • the first access network device sends the first message to the terminal device, so that the terminal device can obtain the TA including the terminal device in the target cell, so that the terminal device can complete uplink synchronization in advance, thereby reducing cell handover delay.
  • the first message is a radio resource control RRC reconfiguration message
  • the second message is an RRC reconfiguration complete message
  • the RRC reconfiguration message is used for the terminal equipment to obtain its TA in the target cell.
  • the terminal device can complete uplink synchronization before accessing the target cell, that is, complete uplink synchronization in advance.
  • the first message is RRCReconfiguration, which can be better compatible with existing signaling.
  • the terminal device sends an RRC reconfiguration complete message (RRCReconfigurationComplete) to the first access network device to notify the first access network device that the terminal device has completed the configuration of the target cell.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can quickly and accurately obtain the TA of the target cell and/or configuration information of the target cell according to the first message.
  • the method before the first access network device sends the first message to the terminal device, the method further includes: the first access network device sends the first indication information and Second indication information, where the first indication information instructs the terminal device to perform synchronization-related operations, and the second indication information indicates time-frequency resources available for the terminal device to send uplink signals to the target cell.
  • the first access network device sends the first indication information and the second indication information to the terminal device, so as to instruct the terminal device to perform synchronization-related operations in time before configuring the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same message; signaling overhead can be saved.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information and the second indication information are carried in different messages. Since the first indication information and the second indication information have different functions and formats, the first indication information and the second indication information are more suitable to be carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the first indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI;
  • the second indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI by using the existing Signaling is used to carry the first indication information, so as to reduce the impact on the existing communication system.
  • the first access network device sending the first indication information to the terminal device includes: the first access network device sends an The terminal device sends the first indication information.
  • the first access network device sends the first indication information to the terminal device after the synchronization beam coverage of the target cell is completed; it can send the first indication information to the terminal device in time, and ensure that the terminal device receives the first indication information. After the first indication information, downlink synchronization can be realized.
  • the method further includes : the first access network device receives a first uplink signal from the terminal device; the first uplink signal is used to obtain the TA of the terminal device in the target cell, and the first access network device Belonging to an entity corresponding to the target cell; or, the first access network device receives a third message from the second access network device, where the third message includes the TA of the terminal device in the target cell,
  • the second access network device belongs to an entity corresponding to the target cell, and the first access network device and the second access network device belong to different entities.
  • the first access network device before the first access network device sends the first message to the terminal device, the first access network device receives the first uplink signal from the terminal device or receives the third message from the second access network device , so as to obtain the TA of the terminal device in the target cell.
  • the first access network device can carry information used to obtain the TA of the terminal device in the target cell in the first message, so that when the terminal device obtains the configuration information of the target cell, it can obtain the TA of the terminal device in the target cell. TA information.
  • the first message includes third indication information, where the third indication information is used to indicate a condition for the terminal device to switch to the target cell.
  • the third indication information is used to indicate the conditions for the terminal equipment to switch to the target cell.
  • the terminal device needs to be switched, it is not necessary for the network to send a switching signaling trigger to the terminal, which can reduce signaling overhead.
  • the method further includes: before the cell currently accessed by the terminal device goes dormant or restores coverage, sending a message indicating to the terminal device Information that satisfies the stated conditions.
  • the embodiment of the present application provides another method for early synchronization, including: the first access network device sends an RRC reconfiguration message to the terminal device; the RRC reconfiguration message is used by the terminal device to obtain the terminal device The device is in the TA of the target cell, and the target cell does not belong to the cell currently accessed by the terminal device; the first access network device receives an RRC reconfiguration complete message from the terminal device, and the RRC reconfiguration message Indicating that the terminal device has completed the configuration of the target cell.
  • the first access network device may belong to an entity corresponding to a cell currently accessed by the terminal device.
  • the RRC reconfiguration message is used for the terminal equipment to obtain the TA of the terminal equipment in the target cell.
  • the first access network device sends the RRC reconfiguration message to the terminal device, which can enable the terminal device to obtain the TA of the terminal device in the target cell, so that the terminal device can complete uplink synchronization in advance, thereby reducing cell handover delay.
  • the RRC reconfiguration message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can quickly and accurately obtain the TA of the terminal device in the target cell and/or the configuration information of the target cell according to the RRC reconfiguration message.
  • the embodiment of the present application provides another method for advance synchronization, including: after the first access network device sends first indication information to the terminal device, then sends a first message to the terminal device; the first indication The information indicates that the terminal device performs synchronization-related operations in the target cell; the first message is used for the terminal device to obtain configuration information of the target cell.
  • the first access network device after the first access network device sends the first indication information to the terminal device, it sends the first message to the terminal device; in this way, the terminal device can perform synchronization-related operations before receiving the first message, Therefore, the time delay caused by uplink and downlink synchronization during cell switching is reduced.
  • the method before sending the first message to the terminal device, the method further includes: the first access network device sending second indication information to the terminal device, and the second The indication information indicates the available time-frequency resources for the terminal device to send an uplink signal to the target cell.
  • the first access network device sends the second indication information to the terminal device before sending the first message to the terminal device; so that the terminal device obtains the The time-frequency resources available for the device to send uplink signals to the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same message; signaling overhead can be saved.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information and the second indication information are carried in different messages. Since the first indication information and the second indication information have different functions and formats, the first indication information and the second indication information are more suitable to be carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the first indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI;
  • the second indication information is carried in any one of the RRC reconfiguration message, MACCE, and DCI by using the existing Signaling is used to carry the first indication information, so as to reduce the impact on the existing communication system.
  • the method further includes: the first access network device The network access device receives a first uplink signal from the terminal device; the first uplink signal is used to obtain the TA of the terminal device in the target cell, and the first access network device belongs to the target cell corresponding or, the first access network device receives a third message from the second access network device, where the third message includes the TA of the terminal device in the target cell, and the second access network device
  • the network equipment belongs to the entity corresponding to the target cell, and the first access network equipment and the second access network equipment belong to different entities.
  • the first access network device before the first access network device sends the first message to the terminal device, the first access network device receives the first uplink signal from the terminal device or receives the third message from the second access network device , so as to obtain the TA of the terminal device in the target cell.
  • the first access network device can carry information used to obtain the TA of the terminal device in the target cell in the first message, so that when the terminal device obtains the configuration information of the target cell, it can obtain the TA of the terminal device in the target cell. TA information.
  • the first message is also used by the terminal device to obtain the TA of the terminal device in the target cell.
  • the first message is also used for the terminal device to obtain its TA in the target cell.
  • the terminal device obtains the TA of the terminal device in the target cell before accessing the target cell according to the first message, so that the terminal device can realize uplink synchronization in the target cell in advance, thereby reducing the time delay of cell handover.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the terminal device can directly obtain the TA of the terminal device in the target cell and/or the configuration information of the target cell according to the first message.
  • the embodiment of the present application provides another method for advance synchronization, including: the second access network device sends a third message to the first access network device, and the third message is used for the first access network device
  • the network device obtains the TA of the terminal device in the target cell, the target cell does not belong to the cell currently accessed by the terminal device, the second access network device belongs to the entity corresponding to the target cell, and the first access The network device belongs to the entity corresponding to the cell currently accessed by the terminal device.
  • the second access network device and the second access network device belong to different entities.
  • the second access network device sends a third message to the first access network device; this enables the first access network device to obtain the TA of the terminal device in the target cell, and then completes the terminal device's TA in the target cell in advance.
  • the uplink synchronization of the cell reduces the delay of cell handover.
  • the method before the second access network device sends the third message to the first access network device, the method further includes: the second access network device receiving a message from the terminal device A first uplink signal: the second access network device determines the TA of the terminal device in the target cell according to the first uplink signal.
  • the second access network device determines the TA of the terminal device in the target cell according to the first uplink signal; so as to complete the uplink synchronization in the target cell in advance, thereby reducing the time delay of cell handover.
  • the third message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the second access network device sends a third message to the first access network device, which may enable the first access network device to directly obtain the TA of the terminal device in the target cell and/or the configuration of the target cell information.
  • the method further includes: widening part or all of the beam coverage of the target cell; after completing the widening of the beam coverage of the target cell, sending the information indicating that the terminal device satisfies the conditions for switching to the target cell.
  • the method further includes: after the operation of the target cell is completely restored, sending information to the terminal device indicating that the terminal device meets the conditions for switching to the target cell .
  • the embodiments of the present application provide a communication device, where the communication device has a function of implementing the behaviors in the method embodiments of the first aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, where: the transceiver module is configured to receive a first message from a first access network device; and the first message is used by a terminal device (that is, the The communication device) obtains the TA of the terminal device in the target cell, and the target cell does not belong to the cell currently accessed by the terminal device; the transceiver module is further configured to send the second message; the second message indicates that the terminal device has completed the configuration of the target cell.
  • the first message is an RRC reconfiguration message
  • the second message is an RRC reconfiguration complete message
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the transceiver module is further configured to receive a first indication from the first access network device before receiving the first message from the first access network device information and second indication information, the first indication information instructs the terminal device to perform synchronization-related operations, and the second indication information indicates time-frequency resources available for the terminal device to send uplink signals to the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the target cell before the terminal device receives the first indication information, the target cell has completed synchronous beam coverage.
  • the communication apparatus further includes: a processing module, configured to detect the location of the target cell before the transceiver module receives the first message from the first access network device. synchronization signal to complete downlink synchronization; the processing module is further configured to control the transceiver module to send a first uplink signal to the target cell according to the second indication information, and the first uplink signal is used to determine the The TA of the terminal device in the target cell.
  • the processing module is specifically configured to control the transceiving module to use the time-frequency resource indicated by the second indication information to send the first uplink signal to the target cell.
  • the processing module is further configured to, before the transceiver module sends the second message to the first access network device, according to the first message, complete the configuration, and acquire the TA of the terminal device in the target cell.
  • the first message further includes third indication information, where the third indication information is used to indicate a condition for the terminal device to switch to the target cell.
  • the processing module is further configured to evaluate the condition; if the condition is satisfied, perform cell handover according to the TA of the terminal device in the target cell.
  • the conditions include one or more of the following: the signal quality of the cell currently accessed by the terminal device measured by the terminal device is lower than a first threshold; the target measured by the terminal device The signal quality of the cell is higher than or equal to the second threshold.
  • the fact that the condition is met includes receiving information indicating that the condition is met.
  • the embodiments of the present application provide a communication device, where the communication device has a function of implementing the behaviors in the method embodiments of the second aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, wherein: the transceiver module is configured to receive an RRC reconfiguration message from a first access network device; the RRC reconfiguration message is used for a terminal device (that is, the tenth The communication device of the aspect) obtains the TA of the terminal device in the target cell, and the target cell does not belong to the cell currently accessed by the terminal device; the transceiver module is further configured to send the TA to the first access network device An RRC reconfiguration complete message: the RRC reconfiguration complete message indicates that the terminal device has completed the configuration of the target cell.
  • the RRC reconfiguration message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the embodiments of the present application provide a communication device, where the communication device has a function of implementing the behaviors in the method embodiments of the third aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the transceiver module includes a transceiver module and a processing module, wherein: the transceiver module is configured to receive first indication information from the first access network device, and the first indication information indicates the terminal device (ie, The communication device of the eleventh aspect) performs synchronization-related operations; the processing module is configured to perform synchronization-related operations in the target cell according to the first indication information; the transceiver module is further configured to complete synchronization in the processing module After related operations, receive a first message from the first access network device; the first message is used by the terminal device to obtain configuration information of the target cell.
  • the processing module is specifically configured to detect a synchronization signal of the target cell to complete downlink synchronization.
  • the transceiver module is further configured to receive second indication information from the first access network device before receiving the first message from the first access network device, the The second indication information indicates the time-frequency resources available for the terminal device to send an uplink signal to the target cell; the processing module is further configured to control the transceiver module to send an uplink signal to the target cell according to the second indication information.
  • a first uplink signal where the first uplink signal is used to determine the TA of the terminal device in the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the embodiment of the present application provides a communication device, and the communication device has a function of implementing the behavior in the method embodiment of the fourth aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, wherein: the transceiver module is configured to send a first message to the terminal device; the first message is used by the terminal device to obtain the information of the terminal device in the target cell. TA, the target cell does not belong to the cell currently accessed by the terminal device; the transceiver module is further configured to receive a second message from the terminal device, the second message indicating that the terminal device has completed the Describe the configuration of the target cell.
  • the first message is a radio resource control RRC reconfiguration message
  • the second message is an RRC reconfiguration complete message
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the transceiver module is further configured to send first indication information and second indication information to the terminal device before sending the first message to the terminal device, the first indication The information instructs the terminal device to perform synchronization-related operations, and the second indication information indicates time-frequency resources available for the terminal device to send an uplink signal to the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the transceiver module is specifically configured to send the first indication information to the terminal device after the target cell has completed synchronous beam coverage.
  • the transceiver module is further configured to receive a first uplink signal from the terminal device before sending the first message to the terminal device; the first uplink signal is used to obtain the The terminal device is in the TA of the target cell, and the first access network device belongs to an entity corresponding to the target cell; or, the transceiver module is further configured to receive a message from the first message before sending the first message to the terminal device.
  • the third message of the second access network device the third message includes the TA of the terminal device in the target cell, the second access network device belongs to the entity corresponding to the target cell, and the first access network device The network access device and the second access network device belong to different entities.
  • the first message includes third indication information, where the third indication information is used to indicate a condition for the terminal device to switch to the target cell.
  • the transceiving module is further configured to send information indicating that the condition is met to the terminal device before the cell currently accessed by the terminal device goes to sleep or restores coverage.
  • the embodiment of the present application provides a communication device, and the communication device has a function of implementing the behavior in the method embodiment of the fifth aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, wherein: the transceiver module is configured to send an RRC reconfiguration message to the terminal device; the RRC reconfiguration message is used by the terminal device to obtain The TA of the cell, the target cell does not belong to the cell currently accessed by the terminal device; the transceiver module is further configured to receive an RRC reconfiguration complete message from the terminal device, and the RRC reconfiguration message indicates the The terminal device has completed the configuration of the target cell.
  • the first access network device may belong to an entity corresponding to a cell currently accessed by the terminal device.
  • the RRC reconfiguration message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the embodiment of the present application provides a communication device, the communication device has a function of implementing the behavior in the method embodiment of the sixth aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, wherein: the transceiver module is configured to send a first message to the terminal device after sending the first indication information to the terminal device; the first indication information indicates the The terminal device performs synchronization-related operations in the target cell; the first message is used for the terminal device to obtain configuration information of the target cell.
  • the transceiver module is further configured to send second indication information to the terminal device before sending the first message to the terminal device, the second indication information indicating that the Time-frequency resources available for the terminal device to send an uplink signal to the target cell.
  • the first indication information and the second indication information are carried in a same message.
  • the first indication information and the second indication information are carried in the same RRC reconfiguration message.
  • the first indication information and the second indication information are carried in different messages.
  • the first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI. any kind.
  • the transceiver module is further configured to receive a first uplink signal from the terminal device before sending the first message to the terminal device; the first uplink signal is used to obtain the The terminal device is in the TA of the target cell, and the first access network device belongs to an entity corresponding to the target cell; or, the transceiver module is further configured to receive a message from the first message before sending the first message to the terminal device.
  • the third message of the second access network device the third message includes the TA of the terminal device in the target cell, the second access network device belongs to the entity corresponding to the target cell, and the first access network device The network access device and the second access network device belong to different entities.
  • the first message is also used by the terminal device to obtain the TA of the terminal device in the target cell.
  • the first message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the embodiment of the present application provides a communication device, and the communication device has a function of implementing the behavior in the method embodiment of the seventh aspect above.
  • the functions described above may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a transceiver module is included, wherein: the processing module is configured to send a third message to the first access network device, and the third message is used for the first access network device to obtain
  • the terminal device is in the TA of the target cell, the target cell does not belong to the cell currently accessed by the terminal device, and the second access network device (that is, the communication device in the fourteenth aspect) belongs to an entity corresponding to the target cell,
  • the first access network device belongs to an entity corresponding to a cell currently accessed by the terminal device.
  • the transceiver module is further configured to receive a first uplink signal from the terminal device;
  • the communication apparatus further includes: a processing module, further configured to, according to the first uplink signal, Determine the TA of the terminal device in the target cell.
  • the transceiver module is further configured to send a first message to the terminal device; the first message is used by the terminal device to obtain the configuration information of the target cell and the terminal The TA of the device in the target cell.
  • the third message includes a TA of the terminal device in the target cell and/or configuration information of the target cell.
  • the processing module is further configured to widen part or all of the beam coverage of the target cell; the transceiver module is further configured to expand the beam coverage of the target cell After widening, send information to the terminal device indicating that the terminal device meets a condition for switching to the target cell.
  • the transceiving module is further configured to, after the operation of the target cell is fully restored, send to the terminal device an Information.
  • the present application provides a communication device, the communication device includes a processor, and the processor can be used to execute the computer-executed instructions stored in the memory, so that any possible implementation of the above-mentioned first aspect or the first aspect
  • the method shown in the manner is executed, or the method shown in the second aspect or any possible implementation of the second aspect is executed, or the third aspect or any possible implementation of the third aspect is executed.
  • the method shown in the above-mentioned fourth aspect or any possible implementation of the fourth aspect is executed, or the method shown in the above-mentioned fifth aspect or any possible implementation of the fifth aspect is executed.
  • the method is executed, or the method shown in the sixth aspect or any possible implementation of the sixth aspect is executed, or the method shown in the seventh aspect or any possible implementation of the seventh aspect is executed implement.
  • the process of sending information in the above method can be understood as the process of outputting information based on the instructions of the processor.
  • the processor In outputting information, the processor outputs the information to the transceiver for transmission by the transceiver. After the information is output by the processor, it may also need to undergo other processing before reaching the transceiver.
  • the processor receives incoming information
  • the transceiver receives that information and inputs it to the processor. Furthermore, after the transceiver receives the information, the information may require other processing before being input to the processor.
  • the above-mentioned processor may be a processor dedicated to performing these methods, or may be a processor that executes computer instructions in a memory to perform these methods, such as a general-purpose processor.
  • the processor may also be used to execute a program stored in the memory, and when the program is executed, the communication device executes the method as shown in the first aspect or any possible implementation manner of the first aspect.
  • the memory is located outside the communication device. In a possible implementation manner, the memory is located in the above communication device.
  • the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.
  • the communication device further includes a transceiver, where the transceiver is configured to receive a message or send a message, and the like.
  • the present application provides another communication device, the communication device includes a processing circuit and an interface circuit, the interface circuit is used to acquire data or output data; the processing circuit is used to perform the above-mentioned first aspect or the first aspect
  • the corresponding method shown in any possible implementation manner, or the processing circuit is used to execute the corresponding method shown in the above second aspect or any possible implementation manner of the second aspect, or the processing circuit is used to execute the above third aspect
  • the method, or the processing circuit is configured to execute the corresponding method as shown in the seventh aspect or any possible implementation manner of the seventh aspect.
  • the present application provides a computer-readable storage medium, which is used to store a computer program, and when it is run on a computer, it enables the above-mentioned first aspect or any possible realization of the first aspect
  • the method shown in the manner is executed, or the method shown in the second aspect or any possible implementation of the second aspect is executed, or the method shown in the third aspect or any possible implementation of the third aspect is executed.
  • the method is executed, or the method shown in the fourth aspect or any possible implementation manner of the fourth aspect is executed, or the method shown in the fifth aspect or any possible implementation manner of the fifth aspect is executed, Or make the method shown in the sixth aspect or any possible implementation manner of the sixth aspect be executed, or cause the method shown in the seventh aspect or any possible implementation manner of the seventh aspect to be executed.
  • the present application provides a computer program product, the computer program product includes a computer program or computer code, and when it is run on a computer, the above-mentioned first aspect or any possible implementation of the first aspect shows The method is executed, or the method shown in the second aspect or any possible implementation of the second aspect is executed, or the method shown in the third aspect or any possible implementation of the third aspect is executed , or make the above fourth aspect or the method shown in any possible implementation of the fourth aspect be executed, or cause the above fifth aspect or the method shown in any possible implementation of the fifth aspect to be executed, or make the above
  • the method shown in the sixth aspect or any possible implementation manner of the sixth aspect is executed, or the method shown in the above seventh aspect or any possible implementation manner of the seventh aspect is executed.
  • the present application provides a communication system, including the communication device described in any possible implementation manners of the eighth aspect to the tenth aspect above, and the communication device described in any possible implementation manners of the eleventh aspect to the thirteenth aspect above.
  • FIG. 1A is an example of a cell sleep/recovery scenario provided by an embodiment of the present application.
  • FIG. 1B is an example of a secondary carrier cell sleep/recovery scenario provided by an embodiment of the present application.
  • FIG. 2 is a flow chart of a method for advance synchronization provided by an embodiment of the present application
  • FIG. 3 is a flow chart of another method for advance synchronization provided by an embodiment of the present application.
  • FIG. 4 is another method flow for advance synchronization provided by the embodiment of the present application.
  • FIG. 5 is another method flow for advance synchronization provided by the embodiment of the present application.
  • FIG. 6 is another method flow for advance synchronization provided by the embodiment of the present application.
  • FIG. 7 is another method flow for advance synchronization provided by the embodiment of the present application.
  • FIG. 8 is a flow chart of a method for cell handover provided in an embodiment of the present application.
  • FIG. 9 is a flow chart of another cell handover method provided in the embodiment of the present application.
  • FIG. 10 is a flow chart of a method for switching a secondary carrier cell provided in an embodiment of the present application.
  • FIG. 11 is a flowchart of a method for switching a secondary carrier cell provided in an embodiment of the present application.
  • FIG. 12 shows a schematic structural diagram of a communication device 1200
  • FIG. 13 is a schematic structural diagram of another communication device 130 provided in an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of another communication device 140 provided in the embodiment of the present application.
  • FIG. 15 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • FIG. 16 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • FIG. 17 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application.
  • the occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.
  • This application provides a solution that can reduce the time delay of cell handover.
  • the main principle of the solution for reducing the delay of cell handover provided by this application is: before the cell completes coverage expansion (or expansion) or fully resumes operation, the terminal device performs pre-synchronization, so as to complete coverage expansion or fully resume operation in the cell After that, the handover of the cell can be quickly completed. That is to say, the terminal device can complete a part or all of the synchronization operations of the terminal device in the cell before the cell completes coverage expansion or fully resumes operation, so that the time delay caused by uplink and downlink synchronization in cell handover can be reduced.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 4G fourth generation
  • NTN non-terrestrial communication network
  • 5G fifth generation
  • 5G new radio
  • 6G new radio
  • the technical solution provided in the present application can be used to solve the problem of long cell switching delay in a multi-carrier multi-cell network scenario or a single-carrier multi-cell network scenario.
  • the technical solution provided by this application is introduced below by taking a cell sleep/recovery scenario in a 5G communication system as an example.
  • FIG. 1A is an example of a cell sleep/recovery scenario provided by an embodiment of the present application.
  • the UE has accessed cell 1; when cell 1 satisfies the dormancy condition, it is necessary to make cell 1 go to sleep and cell 2 to expand. Therefore, the UE needs to perform cell handover from cell 1 to cell 2 .
  • the UE has access to the extended cell 2 (the extended cell 2); when the cell 1 meets the restoration condition, the coverage of the cell 2 needs to be restored, and the cell 1 is restarted. Therefore, the UE needs to perform cell handover from cell 2 to cell 1 .
  • Cell 1 and cell 2 may correspond to the same entity (or co-sited), or may correspond to different entities (or not co-sited).
  • FIG. 1B is an example of a secondary carrier cell sleep/recovery scenario provided by an embodiment of the present application.
  • the UE has accessed the primary carrier cell 1 and the secondary carrier cell 1; when the secondary carrier cell 1 satisfies the dormancy condition, the secondary carrier cell 1 needs to be dormant, and the secondary carrier cell 2 is widened. Therefore, the UE needs to perform cell handover from the secondary carrier cell 1 to the secondary carrier cell 2 .
  • the UE has accessed the main carrier cell 1 and the extended secondary carrier cell 2 (the expanded secondary carrier cell 2); when the secondary carrier cell 1 meets the recovery conditions, the coverage of the secondary carrier cell 2 needs to be restored , restart the secondary carrier cell 1.
  • the primary carrier cell 1 and the secondary carrier cell 2 may correspond to the same entity (or co-sited), or may correspond to different entities (or non-co-sited).
  • entities corresponding to the primary carrier cell, the secondary carrier cell, and the single carrier cell may all be access network devices.
  • the access network device may be any device that has a wireless transceiver function and can communicate with the user equipment, for example, a radio access network (radio access network, RAN) node that connects the user equipment to a wireless network.
  • RAN radio access network
  • examples of some RAN nodes include: gNB, transmission reception point (TRP), 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), base band unit (base band unit , BBU), wireless fidelity (Wifi) access point (access point, AP), integrated access and backhaul (IAB), etc.
  • a base station is used as an example of an access network device for description.
  • a user equipment (user equipment, UE) is a device with a wireless transceiver function.
  • the user equipment can communicate with one or more core network (core network, CN) equipment (or called core equipment) via an access network device (or called an access device) in a radio access network (radioaccess network, RAN). communication.
  • Core network CN
  • RAN radio access network
  • User equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as on aircraft, balloons, and satellites, etc.).
  • the UE can also be called a terminal device, which can be a 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 terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, smart grid Wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, wireless terminal equipment in smart home, etc.
  • the user equipment may be a handheld device with a wireless communication function, a vehicle-mounted device, a wearable device, or a terminal in the Internet of Things, the Internet of Vehicles, a 5G network, or any form of terminal in the future network. Not limited.
  • the access network device may be any device that has a wireless transceiver function and can communicate with the user equipment, for example, a radio access network (radio access network, RAN) node that connects the user equipment to a wireless network.
  • radio access network radio access network
  • RAN nodes include: gNB, transmission reception point (TRP), 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), base band unit (base band unit , BBU), wireless fidelity (Wifi) access point (access point, AP), integrated access and backhaul (IAB), etc.
  • TRP transmission reception point
  • eNB evolved Node B
  • RNC radio network controller
  • Node B Node B
  • base station controller base station controller
  • the UE When the location of the UE changes or the service quality of the cell changes, the UE needs to change to another cell to ensure the service quality in the connected state. This process is called cell handover.
  • the following introduces a flow of secondary carrier cell handover in a multi-carrier multi-cell environment. It should be noted that: in the multi-carrier configuration, the control information of the secondary carrier cell is sent by the primary carrier cell where the UE is located.
  • An example of the process of secondary carrier cell handover in a multi-carrier multi-cell environment is as follows:
  • the main carrier cell transmits the measurement configuration information to the UE through the RRCReconfiguration message.
  • the UE replies with an RRCReconfigurationComplete message, and performs related measurement of the secondary carrier cell according to the measurement configuration information, and generates a measurement result.
  • the UE reports the measurement result to the primary carrier cell through a measurement report.
  • the primary carrier cell selects a suitable new secondary carrier cell, and sends an RRCReconfiguration message to the UE.
  • the RRCReconfiguration message includes configuration information of a new secondary carrier cell selected by the primary carrier cell (hereinafter referred to as the target secondary carrier cell), dedicated preamble (preamble) and other information.
  • the UE scans the synchronization signal block (SSB) beam of the target secondary carrier cell to perform operations such as downlink synchronization and acquisition of system information.
  • SSB synchronization signal block
  • the UE carries a dedicated preamble in the target secondary carrier cell to initiate a non-contention random access (random access) message.
  • a random access (random access) message may be called Message 1 (MSG1).
  • the target secondary carrier cell replies with a random access response message (random access response).
  • the random access reply message includes a TA command.
  • the random access response message (random access response) may be called Message 2 (MSG1).
  • the TA command is used to implement time synchronization on the base station side, that is, uplink synchronization.
  • the UE performs downlink synchronization and returns RRCReconfigurationComplete.
  • RRCReconfigurationComplete instructs the UE to complete the cell handover, that is, to handover to the target secondary carrier cell.
  • TA timing advance
  • the principle of TA is: configure a timing advance (ie, TA value) for the UE, and adjust the uplink timing according to the configured TA value when the UE sends uplink data.
  • TA value a timing advance
  • the base station can calculate the TA value of the UE by measuring uplink signals such as a preamble or an uplink sounding reference signal (SRS) sent by the UE.
  • the base station sends a timing advance command (timing advance command, TAC) to the UE, and notifies the UE of the TA value.
  • TAC can be carried in MAC CE.
  • Downlink synchronization refers to synchronization on the UE side, that is, the UE obtains the timing and frequency of the base station.
  • the UE implements downlink synchronization by receiving the synchronization signal sent by the base station.
  • the 5G synchronization signal may include a primary synchronization signal (primary synchronization signal, PSS) and a secondary synchronization signal (secondary synchronization signal, SSS), carried in a synchronization signal block (synchronization signal block, SSB).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the cell usually sends the SSB periodically, and the UE searches for and receives the SSB to obtain downlink synchronization.
  • the advance synchronization method provided by the embodiment of the present application can reduce the time delay of cell handover.
  • the method for advance synchronization provided by the embodiment of the present application is described below with reference to the accompanying drawings.
  • FIG. 2 is a flow chart of a method for advance synchronization provided by an embodiment of the present application. As shown in Figure 2, the method includes:
  • a terminal device receives a first message from a first access network device.
  • the first message is used for the terminal device to obtain the TA of the terminal device in the target cell.
  • the first message includes the TA of the terminal device in the target cell and the identifier of the target cell.
  • the foregoing first message may further include configuration information of the target cell.
  • the foregoing first message is a radio resource control RRC reconfiguration message, that is, an RRCReconfiguration message.
  • the first access network device may be an entity corresponding to a cell currently accessed by the terminal device.
  • the state of a cell (such as a target cell or other cells) can be divided into four types, the first is a normal working state, the second is a dormant state, the third is a coverage expansion state, and the fourth state is an intermediate state. state.
  • the cell When the cell is in the normal working state, the cell operates normally (its coverage is the coverage before the expansion), such as cell 2 (left) in FIG. 1A and secondary carrier cell 2 (left) in FIG. 1B .
  • the cell When a cell is in a dormant state, the cell is dormant.
  • a cell in a coverage expansion state refers to a state in which the cell has completed widening (or coverage expansion has been completed), such as cell 2 (right) in FIG. 1A and secondary carrier cell 2 (right) in FIG. 1B .
  • the intermediate state of the cell includes a state between the cell switching from the sleep state to the normal working state, and a state between the cell switching from the normal working state to the coverage expansion state.
  • the target cell may be a cell to be accessed by the terminal device. It can be understood that the terminal device is to be handed over from the currently accessed cell to the target cell. For example, the terminal device has been connected to cell 1; cell 1 is waiting to enter a dormant state, and cell 2 is widened (that is, the coverage of cell 2 is expanded); the terminal device needs to perform cell handover from cell 1 to cell 2; among them, Cell 2 is the target cell, and Cell 1 is the cell currently accessed by the terminal device.
  • cell 1 is in a dormant state, and cell 2 is in a coverage expansion state; UE has accessed cell 2; cell 2 is about to recover (cancel extension) and resume (restart) the operation of cell 1; UE needs to perform cell handover, Handover from cell 2 to cell 1; wherein, cell 1 is a target cell, and cell 2 is a cell currently accessed by the terminal device.
  • the terminal device has accessed the primary carrier cell 1 and the secondary carrier cell 1; the secondary carrier cell 1 is to enter a dormant state, and the secondary carrier cell 2 is widened (that is, the coverage of the secondary carrier cell 2 is expanded); the terminal device needs to Executing cell handover, switching from secondary carrier cell 1 to secondary carrier cell 2; wherein secondary carrier cell 2 is the target cell, and secondary carrier cell 1 is the secondary carrier cell currently accessed by the terminal device.
  • primary carrier cell 1 and primary carrier cell 2 are in normal working state, secondary carrier cell 1 is in dormant state, and secondary carrier cell 2 is in coverage expansion state; UE has access to primary carrier cell 1 and secondary carrier cell 2; Secondary carrier cell 2 is about to restore (cancel extension) and resume (restart) the operation of secondary carrier cell 1; UE needs to perform cell handover from secondary carrier cell 2 to secondary carrier cell 1; among them, secondary carrier cell 1 is the target cell , the secondary carrier cell 2 is the secondary carrier cell currently accessed by the terminal device.
  • the terminal device sends a second message to the first access network device.
  • the second message indicates that the terminal device has completed configuration of the target cell.
  • the second message is an RRC reconfiguration complete message, that is, an RRCReconfigurationComplete message.
  • the terminal device receives the first message from the first access network device.
  • the terminal device can obtain its TA in the target cell according to the first message, and then complete uplink synchronization in advance, which can reduce the time delay of secondary carrier cell handover.
  • FIG. 3 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • the method flow in FIG. 3 is a possible implementation of the method described in FIG. 2 .
  • the method flow includes:
  • the terminal device receives a first indication message and second indication information from a first access network device.
  • the first indication information instructs the terminal device to perform synchronization-related operations
  • the second indication information indicates time-frequency resources available for the terminal device to send an uplink signal to the target cell.
  • operations related to synchronization include uplink synchronization and/or downlink synchronization.
  • the first access network device is an entity corresponding to the cell currently accessed by the terminal device.
  • the target cell Before the terminal device receives the first indication information, the target cell has completed synchronization beam coverage; thus, the terminal device can realize synchronization-related operations, such as downlink synchronization, only after receiving the first indication information.
  • the first indication message and the second indication information are carried in the same message, such as an RRC reconfiguration message or other messages.
  • the first indication information and the second indication information are carried in the same message; signaling overhead can be saved.
  • the first indication message and the second indication information are carried in different messages. Since the first indication information and the second indication information have different functions and formats, the first indication information and the second indication information are more suitable to be carried in different messages.
  • the above-mentioned first indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI
  • the above-mentioned second indication information is carried in any one of the RRC reconfiguration message, MAC CE, and DCI.
  • the terminal device detects a synchronization signal of the target cell to complete downlink synchronization.
  • the synchronization signal of the target cell may be SSB or other signals, which are not limited in this application.
  • the terminal device After receiving the first indication message, the terminal device executes step 302 . It can be understood that, after receiving the first indication message, the terminal device learns that synchronization-related operations need to be performed according to the first indication information, and thus performs step 302 .
  • step 302 A possible implementation manner of step 302 is as follows: the terminal device searches for and receives a synchronization signal sent by the target cell to complete downlink synchronization. For example, the target cell periodically sends the SSB, and the UE searches for and receives the SSB to obtain downlink synchronization.
  • the terminal device sends the first uplink signal to the target cell according to the second indication information.
  • the first uplink signal is used to determine the TA of the terminal device in the target cell.
  • the first uplink signal is a known uplink signal (such as preamble, SRS, etc.) that can be used to calculate the TA.
  • Sending the first uplink signal to the target cell may be sending the first uplink signal to a second access network device corresponding to the target cell.
  • the second access network device is an entity corresponding to the target cell.
  • step 303 is as follows: the terminal device sends the first uplink signal to the target cell by using the time-frequency resources available for the terminal device to send the uplink signal to the target cell according to the second indication information.
  • the terminal device receives the first message from the first access network device.
  • step 304 refer to step 201.
  • the terminal device sends the second message to the first access network device.
  • step 305 refer to step 202.
  • the terminal device before the terminal device receives the first message from the first access network device, it detects the synchronization signal of the target cell to complete the downlink synchronization and sends the first uplink signal to the target cell, which can be completed before performing cell handover. Uplink and downlink synchronization, thereby reducing the delay of cell switching.
  • the terminal device before the terminal device receives the first message from the first access network device, it detects the synchronization signal of the target cell to complete the downlink synchronization, which can complete the downlink synchronization before performing cell switching, thereby reducing the time for cell switching. delay.
  • FIG. 2 to FIG. 4 describe the method flow of the advance synchronization performed by the terminal device.
  • the following describes the flow of the method for the advance synchronization performed by the first access network device corresponding to the cell currently accessed by the terminal device.
  • FIG. 4 is a flowchart of another method for advance synchronization provided by the embodiment of the present application. As shown in Figure 4, the method flow includes:
  • the first access network device sends a first message to the terminal device.
  • the foregoing first message is used for the terminal device to obtain the TA of the terminal device in the target cell.
  • the first message includes the TA of the terminal device in the target cell and the identifier of the target cell.
  • the first message may also include configuration information of the target cell.
  • the foregoing first message is a radio resource control RRC reconfiguration message.
  • RRC reconfiguration message For step 401, refer to step 201.
  • the first access network device receives the second message from the terminal device.
  • Step 402 can refer to step 202 .
  • the first message is used for the terminal device to obtain its TA in the target cell.
  • the first access network device sends the first message to the terminal device, which can enable the terminal device to obtain the TA of the terminal device in the target cell before accessing the target cell, so that the uplink synchronization can be completed in advance, thereby reducing the time for cell handover delay.
  • FIG. 5 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • the method flow in FIG. 5 is a possible implementation of the method described in FIG. 4 .
  • the method flow includes:
  • the first access network device sends first indication information and second indication information to a terminal device.
  • the first indication information instructs the terminal device to perform synchronization-related operations
  • the second indication information indicates time-frequency resources available for the terminal device to send an uplink signal to the target cell.
  • the first access network device is an entity corresponding to the cell currently accessed by the terminal device. For step 501, refer to step 301.
  • the first access network device receives a first uplink signal from a terminal device.
  • the first uplink signal is used to acquire the TA of the terminal device in the target cell.
  • the first access network device is an entity corresponding to a cell currently accessed by the terminal device, and an entity corresponding to a target cell to be accessed by the terminal device. It should be understood that the cell currently accessed by the terminal device and the target cell correspond to the same entity (ie co-sited).
  • the first access network device determines the TA of the terminal device in the target cell according to the first uplink signal.
  • Steps 502 and 503 describe that when the first access network device is the entity corresponding to the cell currently accessed by the terminal device and is the entity corresponding to the target cell to be accessed by the terminal device, the first access network device obtains the terminal device The way of the TA in the target cell.
  • steps 502 to 503 may be replaced by: the first access network device receives the third message from the second access network device, The third message includes the TA of the terminal device in the target cell; the first access network device acquires the TA of the terminal device in the target cell according to the third message.
  • the second access network device belongs to the entity corresponding to the target cell, and the first access network device and the second access network device belong to different entities.
  • the station where the target cell is located sends a report to the station where the cell currently accessed by the terminal device (the first access network device)
  • Send a third message (may be referred to as an assisted handover message), where the message includes the TA of the UE in the target cell.
  • the first access network device sends the first message to the terminal device.
  • step 504 refer to step 401.
  • the first access network device receives the second message from the terminal device.
  • step 505 refer to step 402.
  • the first access network device sends the first instruction information and the second instruction information to the terminal device, so as to instruct the terminal device to perform synchronization-related operations in time before configuring the target cell.
  • the first access network device receives the first uplink signal from the terminal device or receives the third message from the second access network device, so as to obtain the TA of the target cell.
  • the first access network device can carry information used to obtain the TA of the terminal device in the target cell in the first message, so that when the terminal device obtains the configuration information of the target cell, it can obtain the TA of the terminal device in the target cell. TA information.
  • FIG. 6 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • the method flow in FIG. 6 is implemented by the second access network device corresponding to the target cell. As shown in Figure 6, the method flow includes:
  • the second access network device receives a first uplink signal from a terminal device.
  • step 601 is as follows: the second access network device receives the first uplink signal from the terminal device before completing the coverage of the target cell.
  • the completion of the coverage of the target cell by the second access network device may be that the second access network device adjusts the target cell from a dormant state to a normal working state, or may adjust the target cell from a normal working state to a coverage expansion state. It can be understood that after the second access network device completes the coverage of the target cell, the target cell is in a normal working state or a coverage expansion state.
  • the second access network device determines the TA of the terminal device in the target cell according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in the target cell.
  • the third message includes the TA of the terminal device in the target cell and configuration information of the target cell.
  • Step 603 is optional. It should be understood that when the second access network device belongs to the entity corresponding to the target cell to be accessed by the terminal device and does not belong to the entity corresponding to the cell currently accessed by the terminal device, after performing step 602, the second access network device , step 603 may be executed, so that the first access network device obtains the TA of the terminal device in the target cell. That is to say, when the station where the cell currently accessed by the terminal device is located (the first access network device) and the station where the target cell to be accessed is located (the second access network device) are not on the same site, the second access After performing step 602, the network device needs to perform step 603.
  • the second access network device When the second access network device belongs to the entity corresponding to the target cell to be accessed by the terminal device and belongs to the entity corresponding to the cell currently accessed by the terminal device, after performing step 602, the second access network device does not need to perform the step 603. Since the second access network device and the first access network device belong to the same entity (ie co-sited), the second access network device does not need to send the third message to the first access network device.
  • step 603 is as follows: the second access network device sends a third message to the first access network device before completing the coverage of the target cell.
  • the first access network device can obtain the TA of the terminal device in the target cell before the second access network device completes the coverage of the target cell, so as to realize uplink synchronization in advance.
  • the second access network device sends a third message to the first access network device, so that the first access network device obtains the TA of the terminal device in the target cell, so as to realize uplink synchronization in advance.
  • FIG. 7 is a flow chart of another method for advance synchronization provided by the embodiment of the present application.
  • the method flow in FIG. 7 is implemented by the second access network device corresponding to the target cell. As shown in Figure 7, the method flow includes:
  • the second access network device completes the coverage of the synchronization beam of the target cell before completing the coverage of the target cell.
  • the second access network device is an entity corresponding to the target cell to be accessed by the terminal device.
  • the completion of the coverage of the target cell by the second access network device may be that the second access network device adjusts the target cell from a dormant state to a normal working state, or may adjust the target cell from a normal working state to a coverage expansion state.
  • the second access network device needs to complete the coverage of the synchronization beam (such as SSB) and other operations to complete the coverage of the target cell (for example, enter the coverage expansion state).
  • the second access network device may first extend (broaden) the coverage of the synchronization beam of the target cell, so as to complete the coverage of the synchronization beam of the target cell before completing the coverage of the target cell. That is to say, the second access network device completes the coverage of the synchronization beam of the target cell before the target cell enters the coverage expansion state, so that the uplink and downlink synchronization operations can be performed in advance, that is, synchronization-related operations can be performed.
  • the second access network device may implement the coverage of the synchronization beam of the target cell first, so as to complete the coverage of the synchronization beam of the target cell before completing the coverage of the target cell. That is to say, the second access network device completes the coverage of the synchronization beam of the target cell before the target cell enters the working state, so that the uplink and downlink synchronization operations can be performed in advance, that is, synchronization-related operations can be performed.
  • the second access network device receives a first uplink signal from a terminal device before completing coverage of the target cell.
  • the first uplink signal is used to acquire the TA of the terminal device in the target cell.
  • the second access network device determines the TA of the terminal device in the target cell according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in the target cell.
  • the third message includes the TA of the terminal device in the target cell and configuration information of the target cell.
  • Step 704 is optional. It should be understood that when the second access network device belongs to the entity corresponding to the target cell to be accessed by the terminal device and does not belong to the entity corresponding to the cell currently accessed by the terminal device, after performing step 703, the second access network device , step 704 may be executed, so that the first access network device obtains the TA of the terminal device in the target cell. That is to say, when the station where the cell currently accessed by the terminal device is located (the first access network device) and the station where the target cell to be accessed is located (the second access network device) are not on the same site, the second access After performing step 703, the network device needs to perform step 704.
  • the second access network device When the second access network device belongs to the entity corresponding to the target cell to be accessed by the terminal device and belongs to the entity corresponding to the cell currently accessed by the terminal device, after performing step 703, the second access network device does not need to perform the step 704. Since the second access network device and the first access network device belong to the same entity (ie co-sited), the second access network device does not need to send the third message to the first access network device.
  • the second access network device belongs to the entity corresponding to the target cell to be accessed by the terminal device and belongs to the entity corresponding to the cell currently accessed by the terminal device, after the second access network device performs step 703, the second access network device
  • the network access device may send the first message to the terminal device.
  • the foregoing first message is used for the foregoing terminal device to obtain the TA of the foregoing terminal device in the target cell.
  • the second access network device receives the first uplink signal from the terminal device before completing the coverage of the target cell; the uplink synchronization in the target cell can be completed in advance, thereby reducing the delay of cell handover.
  • Completing the uplink synchronization in the target cell ahead of time can be understood as performing a part or all of the operations for the terminal device to realize the uplink synchronization before the target cell enters the coverage expansion state.
  • FIG. 8 is a flow chart of a method for cell handover provided in an embodiment of the present application.
  • FIG. 1A is an example of a cell handover scenario to which the method flow in FIG. 8 is applicable.
  • An example of a cell handover scenario to which the method flow in FIG. 8 is applicable is as follows: both cell 1 and cell 2 are in normal operation mode (i.e., normal working state), UE has connected to cell 1, cell 1 is about to go to sleep, and cell 2 is widening. Therefore, the UE needs to perform cell handover, from cell 1 to cell 2 (cell 2 after widening).
  • the entity corresponding to cell 1 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by cell 1; the entity corresponding to cell 2 is the second access network device, The operations performed by the second access network device may be understood as the operations performed by the cell 2 .
  • Cell 2 may be regarded as an example of the above-mentioned target cell. As shown in Figure 8, the method flow may include:
  • the second access network device widens the synchronous beam coverage of cell 2.
  • Extending the coverage of the synchronization beam of cell 2 by the second access network device may be understood as: the second access network device periodically sends the synchronization beam within the expanded coverage corresponding to cell 2 before completing the coverage of cell 2.
  • the second access network device expands the coverage of the synchronization beam of the cell 2 before the cell 2 enters the coverage expansion state, so that the terminal device performs downlink synchronization.
  • Extending the synchronous beam coverage of the cell 2 may be regarded as pre-extending the synchronous beam coverage of the cell 2.
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • step 802 refer to step 501.
  • the terminal device detects the synchronization signal of cell 2 to complete downlink synchronization.
  • step 803 refer to step 302.
  • the terminal device sends the first uplink signal to cell 2 according to the second indication information.
  • step 804 refer to step 303.
  • the second access network device calculates the TA of the terminal device in cell 2 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in cell 2.
  • Step 806 is optional.
  • the second access network device and the first access network device are different entities, that is, cell 2 and cell 1 are not co-located, the second access network device performs step 806 after performing step 805, so that the first access network device The network access device obtains the TA of the terminal device in cell 2 according to the third message.
  • the second access network device calculates the TA of the terminal device in cell 2, that is, the first access network
  • the device calculates the TA of the terminal device in cell 2, so step 806 does not need to be performed.
  • the second access network device completes the coverage of cell 2.
  • the completion of the coverage of the cell 2 by the second access network device may be understood as that the cell 2 has successfully entered the coverage extension state from the normal working state.
  • the second access network device may preferentially cover the cell 2 with the synchronization beam, so as to complete the coverage of the synchronization beam of the cell 2 as soon as possible. Since the synchronization beam coverage of cell 2 by the second access network device can be regarded as a part of completing the coverage of cell 2, the moment when the second access network device starts to execute step 801 is the moment when the coverage of cell 2 is started. The moment when step 802 is completed can be regarded as the moment when the coverage of cell 2 is completed.
  • 1A is the cell 2 after coverage is completed (coverage expansion state), and the cell 2 on the left is the original cell 2 (normal working state).
  • the second access network device After completing the coverage of the synchronization beam of the cell 2, the second access network device starts to perform related operations that need to be performed to complete the coverage of the cell 2.
  • the second access network device in the process of realizing the coverage of the synchronous beam of the cell 2, concurrently executes related operations that need to be performed to complete the coverage of the cell 2.
  • the first access network device sends a first message to the terminal device to initiate cell handover.
  • the first message may include the configuration information of the cell 2, the TA value of the UE in the cell 2, and the like.
  • the first message may be an RRCReconfiguration message.
  • the terminal device completes the configuration of cell 2, and sends the second message to cell 1.
  • the second message may be RRCReconfigurationComplete for replying to the first message (RRCReconfiguration message).
  • the completion of the configuration of the cell 2 by the terminal device may be that the terminal device completes the configuration of the cell 2 according to the configuration information of the cell 2 in the first message.
  • the completion of the configuration of the cell 2 by the terminal device may be regarded as the completion of the handover from the cell 1 to the cell 2 by the terminal device.
  • the first access network device controls cell 1 to sleep.
  • the first message received by the terminal device includes the configuration information of cell 2 and the TA value of the UE in cell 2; the terminal device can realize uplink synchronization before switching to cell 2.
  • the terminal device detects the synchronization signal of the cell 2 to complete the downlink synchronization; it can realize the downlink synchronization before handing over to the cell 2.
  • the advance synchronization method provided by the embodiment of the present application is adopted in the cell handover process, which reduces the cell handover delay of the cell, reduces the coverage overlap time of the old cell (that is, cell 1) and the target cell (cell 2), and improves user Experience; the speed of cell 1 entering dormancy is accelerated, and the energy saving effect is improved.
  • FIG. 9 is a flow chart of another method for cell handover provided in the embodiment of the present application.
  • FIG. 1A is an example of a cell handover scenario to which the method flow in FIG. 9 is applicable.
  • An example of a cell handover scenario to which the method flow in FIG. 9 is applicable is as follows: cell 2 is in a coverage expansion state (which can be regarded as an extended cell 2), cell 1 is in a dormant state, UE has connected to cell 2, and cell 2 is about to recover (cancel extension), Cell 1 is about to resume operation.
  • the imminent recovery of cell 2 may be understood as the imminent adjustment of cell 2 from a coverage expansion state to a normal working state.
  • the fact that cell 1 is about to resume operation may be understood as that cell 1 is about to adjust from a dormant state to a normal working state. Therefore, the UE needs to perform cell handover, from cell 2 to cell 1 (cell 1 resumed operation).
  • the entity corresponding to cell 2 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by cell 2; the entity corresponding to cell 1 is the second access network device, The operations performed by the second access network device may be understood as the operations performed by the cell 1 .
  • Cell 1 may be regarded as an example of the above-mentioned target cell.
  • the method flow may include:
  • the second access network device performs synchronous beam coverage on cell 1.
  • Covering the cell 2 with the synchronization beam by the second access network device may be understood as: the second access network device periodically sends the synchronization beam within the coverage of the cell 1 .
  • the second access network device periodically sends synchronization beams before the cell 1 enters a normal working state, so that the terminal device performs downlink synchronization.
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • step 902 refer to step 501.
  • the first indication information instructs the terminal device to perform synchronization-related operations.
  • the terminal device detects the synchronization signal of cell 1 to complete downlink synchronization.
  • step 903 refer to step 302.
  • the terminal device sends the first uplink signal to cell 1 according to the second indication information.
  • step 904 refer to step 303.
  • the second access network device calculates the TA of the terminal device in cell 1 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in cell 1.
  • Step 906 is optional.
  • the second access network device and the first access network device are different entities, that is, cell 2 and cell 1 are not co-located, the second access network device performs step 906 after performing step 905, so that the first access network device The network access device obtains the TA of the terminal device in cell 1 according to the third message.
  • the second access network device calculates the TA of the terminal device in cell 1, which is the first access network
  • the device calculates the TA of the terminal device in cell 1, so step 906 does not need to be performed.
  • the second access network device completely restores the operation of cell 1.
  • the fact that the second access network device completely resumes the operation of the cell 1 can be understood as that the cell 1 has successfully entered the normal working state from the dormant working state.
  • the first access network device sends a first message to the terminal device to initiate cell handover.
  • the first message may include the configuration information of cell 1, the TA value of the UE in cell 1, and the like.
  • the first message may be an RRCReconfiguration message.
  • the terminal device completes the configuration of cell 1, and sends the second message to cell 2.
  • the second message may be RRCReconfigurationComplete for replying to the first message (RRCReconfiguration message).
  • the completion of the configuration of the cell 1 by the terminal device may be that the terminal device completes the configuration of the cell 1 according to the configuration information of the cell 1 in the first message.
  • the completion of the configuration of the cell 1 by the terminal device may be regarded as the completion of the handover from the cell 2 to the cell 1 by the terminal device.
  • the first access network device cancels extension of cell 2.
  • Canceling the expansion of the cell 2 by the first access network device may be that the first access network device adjusts the cell 2 from the coverage expansion state to the normal working state.
  • the first message received by the terminal device includes the configuration information of cell 1 and the TA value of the UE in cell 1; the terminal device can realize uplink synchronization before switching to cell 1.
  • the terminal equipment detects the synchronization signal of the cell 1 to complete the downlink synchronization before the cell 1 fully resumes operation; the downlink synchronization can be realized before switching to the cell 1.
  • the advance synchronization method provided by the embodiment of the present application is used in the cell handover process, which reduces the cell handover delay of the cell, reduces the coverage overlap time of the original cell (ie, cell 2) and the target cell (cell 1), and improves user Experience; the recovery speed of cell 1 from dormancy is accelerated, and the impact of cell dormancy on user experience is reduced.
  • the advance synchronization method provided by the embodiment of the present application can make the time granularity of cell sleep and recovery operations finer, increase the chance of cell sleep, and enhance the energy saving effect.
  • FIG. 10 is a flow chart of a method for handover of a secondary carrier cell provided by an embodiment of the present application.
  • FIG. 1B is an example of a secondary carrier cell handover scenario to which the method flow in FIG. 10 is applicable.
  • An example of a secondary carrier cell handover scenario to which the method flow in FIG. The primary carrier cell 1 and the secondary carrier cell 1 are accessed, the secondary carrier cell 1 is about to go dormant, and the secondary carrier cell 2 is widened.
  • the UE needs to perform cell handover, from the secondary carrier cell 1 to the secondary carrier cell 2 (the secondary carrier cell 2 after expansion).
  • the entity corresponding to the primary carrier cell 1 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by the primary carrier cell; the entity corresponding to the secondary carrier cell 2 is the second The access network device, the operation performed by the second access network device can be understood as the operation performed by the secondary carrier cell 2; the entity corresponding to the secondary carrier cell 1 is the third access network device, and the operation performed by the third access network device can be It is understood as the operation performed by the secondary carrier cell 1.
  • the secondary carrier cell 2 may be regarded as an example of the above-mentioned target cell. As shown in Figure 10, the method flow may include:
  • the second access network device widens the synchronization beam coverage of the auxiliary carrier cell 2.
  • the expansion of the synchronization beam coverage of the secondary carrier cell 2 by the second access network device can be understood as: before the second access network device completes the coverage of the secondary carrier cell 2, the extended coverage period corresponding to the secondary carrier cell 2 Send synchronous beams.
  • the second access network device expands the coverage of the synchronization beam of the secondary carrier cell 2 before the secondary carrier cell 2 enters the coverage expansion state, so that the terminal device performs downlink synchronization.
  • Extending the coverage of the synchronization beam of the secondary carrier cell 2 may be regarded as performing the coverage expansion of the synchronization beam on the secondary carrier cell 2 in advance.
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • step 1002 refer to step 501.
  • the first indication information instructs the terminal device to perform synchronization-related operations.
  • the terminal device detects the synchronization signal of the secondary carrier cell 2 to complete downlink synchronization.
  • step 1003 refer to step 302.
  • the terminal device sends the first uplink signal to the secondary carrier cell 2 according to the second indication information.
  • step 1004 refer to step 303.
  • the second access network device calculates the TA of the terminal device in the secondary carrier cell 2 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in the secondary carrier cell 2 .
  • Step 1006 is optional.
  • the second access network device and the first access network device are different entities, that is, when the secondary carrier cell 2 and the primary carrier cell 1 are not co-located, the second access network device performs step 1006 after performing step 1005, So that the first access network device obtains the TA of the terminal device in the secondary carrier cell 2 according to the third message.
  • the second access network device calculates the TA of the terminal device in the secondary carrier cell 2 That is, the first access network device calculates the TA of the terminal device in the secondary carrier cell 2, so step 1006 does not need to be performed.
  • the second access network device completes the coverage expansion of the auxiliary carrier cell 2.
  • the second access network device completing the coverage expansion of the secondary carrier cell 2 may be understood as the secondary carrier cell 2 has successfully entered the coverage expansion state from the normal working state.
  • the first access network device sends a first message to the terminal device to initiate cell handover.
  • the first message may include the configuration information of the secondary carrier cell 2, the TA value of the UE in the secondary carrier cell 2, and the like.
  • the first message may be an RRCReconfiguration message.
  • the terminal device completes the configuration of the secondary carrier cell 2, and sends a second message to the primary carrier cell 1.
  • the second message may be RRCReconfigurationComplete for replying to the first message (RRCReconfiguration message).
  • the completion of the configuration of the secondary carrier cell 2 by the terminal device may be that the terminal device completes the configuration of the secondary carrier cell 2 according to the configuration information of the secondary carrier cell 2 in the first message.
  • the completion of the configuration of the secondary carrier cell 2 by the terminal device may be regarded as the completion of the handover from the secondary carrier cell 1 to the secondary carrier cell 2 by the terminal device.
  • the third access network device controls the auxiliary carrier cell 1 to sleep.
  • the first message received by the terminal device includes the configuration information of the secondary carrier cell 2 and the TA value of the UE in the secondary carrier cell 2; the terminal device can achieve uplink synchronization before switching to the secondary carrier cell 2 .
  • the terminal device detects the synchronization signal of the secondary carrier cell 2 to complete the downlink synchronization before the secondary carrier cell 2 completes the extended coverage; it can realize the downlink synchronization before handing over to the secondary carrier cell 2 .
  • the advance synchronization method provided by the embodiment of the present application is used in the cell handover process, which reduces the cell handover delay of the secondary carrier cell, and reduces the time delay of the original secondary carrier cell (ie, secondary Cell 2) covers overlapping time to improve user experience; speeds up the speed at which auxiliary carrier cell 1 enters dormancy, thereby improving the energy-saving effect.
  • FIG. 11 is a flow chart of a method for handover of a secondary carrier cell provided by an embodiment of the present application.
  • FIG. 1B is an example of a secondary carrier cell handover scenario to which the method flow in FIG. 11 is applicable.
  • the imminent restoration of the secondary carrier cell 2 may be understood as the imminent adjustment of the secondary carrier cell 2 from the coverage expansion state to the normal working state.
  • the fact that the secondary carrier cell 1 is about to resume operation may be understood as that the secondary carrier cell 1 is about to be adjusted from a dormant state to a normal working state. Therefore, the UE needs to perform cell handover from the secondary carrier cell 2 to the secondary carrier cell 1 (secondary carrier cell 1 that resumes operation).
  • the entity corresponding to the primary carrier cell 1 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by the primary carrier cell; the entity corresponding to the secondary carrier cell 1 is the second The access network device, the operation performed by the second access network device can be understood as the operation performed by the secondary carrier cell 1; the entity corresponding to the secondary carrier cell 2 is the third access network device, and the operation performed by the third access network device can be It is understood as the operation performed by the secondary carrier cell 2.
  • the secondary carrier cell 1 may be regarded as an example of the above-mentioned target cell. As shown in Figure 11, the method flow may include:
  • the second access network device performs synchronous beam coverage on secondary carrier cell 1.
  • the second access network device covering the auxiliary carrier cell 1 with the synchronization beam may be understood as: the second access network device periodically sends the synchronization beam within the coverage of the auxiliary carrier cell 1 .
  • the second access network device periodically sends synchronization beams before the secondary carrier cell 1 enters a normal working state, so that the terminal device performs downlink synchronization.
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • step 1102 refer to step 501.
  • the first indication information instructs the terminal device to perform synchronization-related operations.
  • the terminal device detects the synchronization signal of the secondary carrier cell 1 to complete downlink synchronization.
  • step 1103 refer to step 302.
  • the terminal device sends the first uplink signal to the secondary carrier cell 1 according to the second indication information.
  • Step 1104 may refer to step 303 .
  • the second access network device calculates the TA of the terminal device in the secondary carrier cell 1 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message is used for the first access network device to obtain the TA of the terminal device in cell 1 of the secondary carrier.
  • Step 1106 is optional.
  • the second access network device and the first access network device are different entities, that is, when the secondary carrier cell 1 and the primary carrier cell 1 are not co-located, the second access network device performs step 1106 after performing step 1105, So that the first access network device obtains the TA of the terminal device in the secondary carrier cell 1 according to the third message.
  • the second access network device calculates the TA of the terminal device in the auxiliary carrier cell 1. That is, the first access network device calculates the TA of the terminal device in cell 1 of the secondary carrier, so step 1106 does not need to be performed.
  • the second access network device fully restores the operation of the secondary carrier cell 1.
  • the second access network device completely resumes the operation of the secondary carrier cell 1, which means that the secondary carrier cell 1 has successfully entered the normal working state from the dormant working state.
  • the first access network device sends a first message to the terminal device to initiate cell handover.
  • the first message may include the configuration information of the secondary carrier cell 1, the TA value of the UE in the secondary carrier cell 1, and the like.
  • the first message may be an RRCReconfiguration message.
  • the terminal device completes the configuration of the secondary carrier cell 1, and sends a second message to the primary carrier cell 1.
  • the second message may be RRCReconfigurationComplete for replying to the first message (RRCReconfiguration message).
  • the completion of the configuration of the secondary carrier cell 1 by the terminal device may be that the terminal device completes the configuration of the secondary carrier cell 1 according to the configuration information of the secondary carrier cell 1 in the first message.
  • the completion of the configuration of the secondary carrier cell 1 by the terminal device may be regarded as the completion of the handover from the secondary carrier cell 2 to the secondary carrier cell 1 by the terminal device.
  • the third access network device cancels the extension of the secondary carrier cell 2.
  • Canceling the extension of the auxiliary carrier cell 2 by the third access network device may be that the third access network device adjusts the auxiliary carrier cell 2 from the coverage expansion state to the normal working state.
  • the first message received by the terminal device includes the configuration information of the secondary carrier cell 1 and the TA value of the UE in the secondary carrier cell 1; the terminal device can achieve uplink synchronization before switching to the secondary carrier cell 1 .
  • the terminal device detects the synchronization signal of the secondary carrier cell 1 to complete the pre-downlink synchronization; before switching to the secondary carrier cell 1, the downlink synchronization can be realized.
  • the advance synchronization method provided by the embodiment of the present application is used in the cell handover process, which reduces the cell handover delay of the secondary carrier cell, and reduces the time delay of the original secondary carrier cell (ie, secondary Cell 2) covers overlapping time to improve user experience; speeds up the speed at which auxiliary carrier cell 1 enters dormancy, thereby improving the energy-saving effect.
  • the advance synchronization method provided by the embodiment of the present application can make the time granularity of the secondary carrier cell sleep and recovery operation finer, increase the chance of secondary carrier cell sleep, and enhance the energy saving effect.
  • FIG. 12 shows a schematic structural diagram of a communication device 1200 .
  • the communication device 1200 can correspondingly implement the functions or steps implemented by the access network device (such as the first access network device or the second access network device) in the above-mentioned various method embodiments, and can also implement the functions or steps implemented by the above-mentioned various method embodiments.
  • the communication device may include a processing module 1210 and a transceiver module 1220 .
  • a storage unit may also be included, and the storage unit may be used to store instructions (code or program) and/or data.
  • the processing module 1210 and the transceiver module 1220 may be coupled to the storage unit, for example, the processing module 1210 may read instructions (code or program) and/or data in the storage unit to implement a corresponding method.
  • the processing module 1210 may read instructions (code or program) and/or data in the storage unit to implement a corresponding method.
  • Each of the above units can be set independently, or can be partially or fully integrated.
  • the transceiving module 1220 may include a sending module and a receiving module.
  • the communications apparatus 1200 can correspondingly implement the operations and functions of the first access network device in the foregoing method embodiments.
  • the communication apparatus 1200 may be a first access network device, or may be a component (such as a chip or a circuit) applied in the first access network device.
  • the transceiver module 1220 may be used to perform all receiving or sending operations performed by the first access network device in the embodiments shown in FIG. 5 , FIG. 6 , FIG. 8 , and FIG. 9 , such as the steps in the embodiment shown in FIG. 4 401 and step 402, as well as step 501, step 502, step 504, and step 505 in the embodiment shown in FIG. 5, and/or other processes for supporting the technology described herein.
  • the processing module 1210 is configured to execute all operations performed by the first access network device in the embodiments shown in FIG. 5, FIG. 6, FIG. 8, and FIG. Step 503.
  • the communications apparatus 1200 can correspondingly implement the operations and functions of the second access network device in the foregoing method embodiments.
  • the communication apparatus 1200 may be a second access network device, or may be a component (such as a chip or a circuit) applied in the second access network device.
  • the transceiver module 1220 may be used to perform all receiving or sending operations performed by the second access network device in the embodiments shown in FIG. 7 , FIG. 8 , FIG. 9 , FIG. 10 , and FIG. 11 , such as the embodiment shown in FIG. 6 Step 601, step 603 in and step 702, step 704 in the embodiment shown in FIG. 7, and/or other processes for supporting the technology described herein.
  • the processing module 1210 is configured to execute all operations performed by the second access network device in the embodiments of FIG. 7 , FIG. 8 , FIG. 9 , FIG. 10 , and FIG. Step 602 in the embodiment, and step 701 and step 703 in the embodiment shown in FIG. 7 .
  • the communication apparatus 1200 can correspondingly implement the operations and functions of the terminal device in the foregoing method embodiments.
  • the communication apparatus 1200 may be a terminal device, or may be a component (such as a chip or a circuit) applied in the terminal device.
  • the transceiver module 1220 may be used to perform all receiving or sending operations performed by the terminal device in the embodiments shown in FIG. 2, FIG. 3, FIG. 4, FIG. 8, and FIG. , step 202, and step 301, step 303, step 304, and step 305 in the embodiment shown in FIG. 3, and/or other processes for supporting the technology described herein.
  • the processing module 1210 is configured to execute all operations performed by the terminal device in the embodiments of FIG. 2, FIG. 3, FIG. 4, FIG. 8, and FIG. Step 302, and step 402 in the embodiment shown in FIG. 4 .
  • FIG. 13 is a schematic structural diagram of another communication device 130 provided by an embodiment of the present application.
  • the communication device in Fig. 13 may be the above-mentioned terminal equipment.
  • the communication device in FIG. 13 may be the above-mentioned first access network device.
  • the communication device in FIG. 13 may be the above-mentioned second access network device.
  • the communication device 130 includes at least one processor 1320 and a transceiver 1310 .
  • the processor 1320 and the transceiver 1310 may be configured to perform the functions or operations performed by the foregoing first access network device.
  • the processor 1320 may perform one of the following operations: step 503 in FIG. 5 .
  • the transceiver 1310 may perform one or more of the following operations: step 401 and step 402 in FIG. 4, step 501, step 502, step 504 and step 505 in FIG. 5, step 802 and step 808 in FIG. Step 902 and step 908 in FIG. 9 .
  • the processor 1320 and the transceiver 1310 may be configured to perform the functions or operations performed by the foregoing second access network device.
  • the processor 1320 may perform one of the following multiple operations: step 602 in FIG. 6 , step 701 and step 703 in FIG. 7 , and step 801 , step 805 and step 807 in FIG. 8 .
  • the transceiver 1310 may perform one or more of the following operations: step 601 and step 603 in FIG. 6 , step 702 and step 704 in FIG. 7 , step 806 in FIG. 8 , and step 906 in FIG. 9 .
  • the processor 1320 and the transceiver 1310 may be configured to perform functions or operations performed by the foregoing terminal device.
  • the processor 1320 may perform one or more operations as follows: step 302 in FIG. 3 , step 402 in FIG. 4 , step 803 and step 809 in FIG. 8 , and step 903 and step 909 in FIG. 9 .
  • the transceiver 1310 can perform one or more of the following operations: step 201, step 202 in FIG. 2, step 301, step 303, step 304, and step 305 in FIG. 3, step 401, step 403, and step 404, step 804, step 809 in FIG. 8, step 904, step 909 in FIG. 9.
  • the transceiver 1310 is used to communicate with other devices/apparatus through the transmission medium.
  • the processor 1320 uses the transceiver 1310 to send and receive data and/or signaling, and is used to implement the methods in the foregoing method embodiments.
  • the processor 1320 can realize the function of the processing module 1210 , and the transceiver 1310 can realize the function of the transceiver module 1220 .
  • the communication device 130 may further include at least one memory 1330 for storing program instructions and/or data.
  • the memory 1330 is coupled to the processor 1320 .
  • the coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • Processor 1320 may cooperate with memory 1330 .
  • Processor 1320 may execute program instructions stored in memory 1330 . At least one of the at least one memory may be included in the processor.
  • a specific connection medium among the transceiver 1310, the processor 1320, and the memory 1330 is not limited.
  • the memory 1330, the processor 1320, and the transceiver 1310 are connected through the bus 1340.
  • the bus is represented by a thick line in FIG. 13, and the connection between other components is only for schematic illustration. , is not limited.
  • the bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 13 , but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or Execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application.
  • a general purpose processor may be a microprocessor or any conventional processor or the like. 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.
  • FIG. 14 is a schematic structural diagram of another communication device 140 provided by an embodiment of the present application.
  • the communication device shown in FIG. 14 includes a logic circuit 1401 and an interface 1402 .
  • the processing module 1210 in FIG. 12 can be realized by a logic circuit 1401
  • the transceiver module 1220 in FIG. 12 can be realized by an interface 1402 .
  • the logic circuit 1401 may be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc.
  • the interface 1402 may be a communication interface, an input-output interface, or the like.
  • the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection manner of the logic circuit and the interface.
  • the logic circuit and the interface may be used to perform the functions or operations performed by the above-mentioned first access network device.
  • the logic circuit and the interface may be used to perform the functions or operations performed by the above-mentioned second access network device.
  • the logic circuit and the interface may be used to perform the functions or operations performed by the above-mentioned third access network device.
  • the logic circuit and the interface may be used to perform the functions or operations performed by the terminal device described above.
  • the logic circuit and the interface may be used to perform the functions or operations performed by the terminal device described above.
  • the present application also provides a computer-readable storage medium, where computer codes are stored in the computer-readable storage medium, and when the computer codes are run on the computer, the computer is made to execute the methods of the above-mentioned embodiments.
  • the present application also provides a computer program product, the computer program product includes computer code or computer program, and when the computer code or computer program is run on the computer, the method for advance synchronization in the above embodiment is executed.
  • the present application also provides a communication system, including a terminal device, a first access network device, and a second access network device.
  • the present application also provides a communication system, including a terminal device, a first access network device, a second access network device, and a third access network device.
  • FIG. 15 is a flow chart of another method for advance synchronization provided by the embodiment of the present application. As shown in Figure 15, the method includes:
  • the first access network device sends a first message to the terminal device.
  • the terminal device receives the first message from the first access network device.
  • the first message includes third indication information, fourth indication information, and configuration information for the terminal device to access the target cell.
  • the above third indication information is used to indicate the conditions for the terminal equipment to switch to the target cell.
  • This condition can be regarded as a condition for the terminal device to switch from the currently accessed cell to the target cell.
  • the condition may be that a measurement event is met or a signaling is received.
  • the target cell does not belong to the cell currently accessed by the terminal device.
  • the first access network device is an access network device that provides services for the cell currently accessed by the terminal device.
  • the above fourth indication information is used to indicate the TA of the terminal device in the target cell.
  • the above conditions include one or more of the following: the signal quality of the cell currently accessed by the terminal device measured by the terminal device is lower than the first threshold; the signal quality of the target cell measured by the terminal device higher than or equal to the second threshold.
  • the foregoing first threshold and second threshold may be configured according to actual requirements, and are not limited here. The terminal device can reasonably judge whether it needs to switch from the currently accessed cell to the target cell according to the above conditions.
  • the first access network device before sending the first message to the terminal device, sends first indication information and second indication information to the terminal device, where the first indication information instructs the terminal device to perform synchronization-related operations,
  • the second indication information indicates available time-frequency resources for the terminal equipment to send uplink signals to the target cell.
  • the terminal device may detect the synchronization signal of the target cell according to the first indication information to complete downlink synchronization.
  • the terminal device may send a first uplink signal to the target cell according to the second indication information, where the first uplink signal is used to determine the TA of the terminal device in the target cell.
  • the synchronization signal of the target cell is detected to complete the downlink synchronization, and the downlink synchronization with the target cell can be completed before switching to the target cell.
  • the terminal device replies the second message to the first access network device.
  • the second message is used to indicate that the terminal device has received the foregoing first message.
  • the terminal device has completed the configuration of the target cell, such as configuring the TA of the terminal device in the target cell, and evaluating the configured conditions for judging whether to perform target cell handover.
  • the terminal device evaluates whether a condition for switching to the target cell is met.
  • the foregoing condition is to satisfy a measurement event; after receiving the foregoing first message, the terminal device may perform measurement according to a pre-agreed measurement event.
  • the foregoing condition is that a signaling is received; after receiving the foregoing first message, the terminal device may attempt/prepare to accept corresponding signaling and the like.
  • the terminal device performs cell switching according to the configuration information of the target cell and the TA of the terminal device in the target cell.
  • the configuration information of the target cell refers to configuration information for terminal equipment to access the target cell.
  • the terminal device After the terminal device completes the configuration of the target cell, it returns an RRCReconfigurationComplete message to the target cell, and the RRCReconfigurationComplete message indicates that the terminal device has completed the cell handover.
  • the condition that the terminal device is handed over to the target cell is met includes receiving information indicating that the above condition is met.
  • the terminal device receives information from the first access network device indicating that the foregoing condition is met.
  • the terminal device before the terminal device performs cell handover, it receives the first message from the first access network device. Before the handover, the terminal can obtain the configuration of the target cell and the uplink and downlink synchronization in advance, and configure the conditions for handover to the target cell. Performing cell handover with the TA of the terminal device in the target cell, it does not need to spend time to obtain the TA of the terminal device in the target cell; the time delay of cell handover can be further reduced.
  • FIG. 16 is a flow chart of a cell handover method provided by an embodiment of the present application.
  • FIG. 1A is an example of a cell handover scenario to which the method flow in FIG. 16 is applicable.
  • An example of a cell handover scenario to which the method flow in Figure 16 is applicable is as follows: both cell 1 and cell 2 are in the normal operation mode (i.e., in the normal working state), the terminal device has connected to cell 1, cell 1 is about to go to sleep, and cell 2 is about to go to sleep. widen. Therefore, the terminal device needs to perform cell handover, from cell 1 to cell 2 (cell 2 after widening).
  • the entity corresponding to cell 1 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by cell 1; the entity corresponding to cell 2 is the second access network device, The operations performed by the second access network device may be understood as the operations performed by the cell 2 .
  • Cell 2 may be regarded as an example of the above-mentioned target cell. As shown in Figure 16, the method flow may include:
  • the second access network device widens the synchronization beam coverage of cell 2.
  • step 1602 refer to step 801.
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • the first access network device sends the first indication information to the terminal device after cell 2 (that is, the target cell) completes the widening of the synchronous beam coverage; so that the terminal device can complete the connection with cell 2 faster Downlink synchronization.
  • the terminal device detects the synchronization signal of cell 2 to complete downlink synchronization.
  • step 1603 refer to step 302.
  • the terminal device detects the synchronization signal of cell 2 according to the first indication information to complete downlink synchronization.
  • the terminal device sends the first uplink signal to cell 2 according to the second indication information.
  • step 1604 refer to step 303.
  • the second access network device calculates the TA of the terminal device in cell 2 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message may include the TA of the terminal device in cell 2 and configuration information for the terminal device to access cell 1 .
  • Step 1606 is optional.
  • the second access network device and the first access network device are different entities, that is, when cell 2 and cell 1 are not co-located, the second access network device performs step 1606 after performing step 1605, so that the first access network device The network access device obtains the TA of the terminal device in cell 2 and configuration information for the terminal device to access cell 2 according to the third message.
  • the second access network device calculates the TA of the terminal device in cell 2, that is, the first access network
  • the device calculates the TA of the terminal device in cell 2, so step 1606 does not need to be performed.
  • the first access network device sends the first message to the terminal device.
  • the terminal device receives the first message from the first access network device.
  • step 1607 refer to step 1501.
  • the terminal device sends a second message to the first access network device.
  • the second message is used to indicate that the terminal device has received the foregoing first message.
  • the terminal device has completed the configuration of the target cell, for example, configuring the TA of the terminal device in the target cell.
  • the terminal device starts to evaluate whether a condition for switching to the target cell is satisfied.
  • the foregoing condition is to satisfy a measurement event; after receiving the foregoing first message, the terminal device may perform measurement according to a pre-agreed measurement event.
  • the foregoing condition is that a signaling is received; after receiving the foregoing first message, the terminal device may attempt/prepare to accept corresponding signaling and the like.
  • the terminal device evaluates whether a condition for switching to the target cell is met.
  • step 1609 refer to step 1503.
  • cell 1 before dormancy
  • cell 2 after widening
  • the first access network device may send a piece of signaling to the terminal device that the terminal device satisfies the above conditions before the cell 1 goes to sleep.
  • the second access network device may send a piece of signaling to the terminal device that the terminal device satisfies the foregoing conditions after completing the coverage expansion of the cell 2 .
  • the coverage change of the cell 1 and the cell 2 causes the measurement result of the cell to change so as to satisfy the measurement event.
  • the second access network device extends the coverage of cell 2.
  • the first access network device controls cell 1 to sleep.
  • step 1610 and step 1611 is not limited.
  • the first access network device controls the cell 1 to sleep. In this way, it can be prevented that the terminal equipment accessing the cell 1 cannot access the cell 2 in time.
  • the terminal device performs cell switching according to the configuration information of the target cell and the TA of the terminal device in the target cell.
  • the terminal device After the terminal device completes the handover of the cell 2 (that is, the target cell), it returns an RRCReconfigurationComplete message to the cell 2, and the RRCReconfigurationComplete message indicates that the terminal device has completed the cell handover.
  • the terminal device before the terminal device performs cell handover, it receives the first message from the first access network device. Before the handover, the terminal device can obtain the configuration of the target cell and the uplink and downlink synchronization in advance, and configure the conditions for handover to the target cell. The information and the TA of the terminal device in the target cell perform cell handover, without spending time to obtain the TA of the terminal device in the target cell; the time delay of cell handover can be further reduced. In addition, the terminal device detects the synchronization signal of the cell 2 to complete the downlink synchronization before the cell 2 completes the coverage expansion; the downlink synchronization can be realized before the handover to the cell 2.
  • the method of advance synchronization provided by the embodiment of the present application is adopted to further reduce the cell switching delay of the cell, reduce the coverage overlap time of the old cell (that is, cell 1) and the target cell (cell 2), and improve User experience; the speed of cell 1 going into sleep is accelerated, and the energy saving effect is improved.
  • FIG. 17 is a flow chart of another method for cell handover provided in the embodiment of the present application.
  • FIG. 1A is an example of a cell handover scenario to which the method flow in FIG. 17 is applicable.
  • An example of a cell handover scenario to which the method flow in FIG. 17 is applicable is as follows: cell 2 is in a coverage expansion state (which can be regarded as an extended cell 2), cell 1 is in a dormant state, terminal equipment has connected to cell 2, and cell 2 is about to recover ( cancel extension), cell 1 is about to resume operation.
  • the imminent recovery of cell 2 may be understood as the imminent adjustment of cell 2 from a coverage expansion state to a normal working state.
  • the fact that cell 1 is about to resume operation may be understood as that cell 1 is about to adjust from a dormant state to a normal working state. Therefore, the terminal device needs to perform cell handover, from cell 2 to cell 1 (cell 1 resumed operation).
  • the entity corresponding to cell 2 is the first access network device, and the operations performed by the first access network device can be understood as the operations performed by cell 2; the entity corresponding to cell 1 is the second access network device, The operations performed by the second access network device may be understood as the operations performed by the cell 1 .
  • Cell 1 may be regarded as an example of the above-mentioned target cell. As shown in Figure 17, the method flow may include:
  • the second access network device performs synchronous beam coverage on cell 1.
  • step 1701 is as follows: the second access network device periodically sends a synchronization beam within the coverage of the cell 1 .
  • the first access network device sends the first indication information and the second indication information to the terminal device.
  • step 1702 refer to step 501.
  • the terminal device detects the synchronization signal of cell 1 to complete downlink synchronization.
  • step 1703 refer to step 302.
  • the terminal device sends the first uplink signal to cell 1 according to the second indication information.
  • step 1704 refer to step 303.
  • the second access network device calculates the TA of the terminal device in cell 1 according to the first uplink signal.
  • the second access network device sends a third message to the first access network device.
  • the third message may include the TA of the terminal device in cell 1 and configuration information for the terminal device to access cell 1 .
  • Step 1706 is optional.
  • the second access network device and the first access network device are different entities, that is, when cell 2 and cell 1 are not co-located, the second access network device performs step 1706 after performing step 1705, so that the first access network device The network access device obtains the TA of the terminal device in cell 1 and configuration information for the terminal device to access cell 1 according to the third message.
  • the second access network device calculates the TA of the terminal device in cell 1, which is the first access network
  • the device calculates the TA of the terminal device in cell 1, so step 1706 does not need to be performed.
  • the first access network device sends the first message to the terminal device.
  • step 1707 refer to step 1501.
  • the terminal device sends a second message to the first access network device.
  • step 1708 refer to step 1608.
  • the terminal device evaluates whether a condition for switching to the target cell is met.
  • step 1709 refer to step 1503.
  • cell 1 (after restart and recovery)/cell 2 (before recovery) sends a signaling to the terminal device that the terminal device satisfies the above condition. That is to say, the second access network device may send a signaling to the terminal device that the terminal device satisfies the above conditions after the cell 1 restarts and recovers (that is, the operation of the cell 1 is fully restored).
  • the first access network device may send a signaling to the terminal device that the terminal device meets the above conditions before canceling the extension of the cell 2 (that is, restoring the cell 2).
  • the coverage change of the cell 1 and the cell 2 causes the measurement result of the cell to change so as to satisfy the measurement event.
  • the second access network device fully restores the operation of cell 1.
  • step 1710 refer to step 907.
  • the first access network device cancels extension of cell 2.
  • step 1711 refer to step 910.
  • the sequence of step 1710 and step 1711 is not limited.
  • the first access network device cancels the extension of the cell 2 .
  • the terminal device performs cell switching according to the configuration information of the target cell and the TA of the terminal device in the target cell.
  • the terminal device after completing the handover of cell 1 (that is, the target cell), the terminal device replies an RRCReconfigurationComplete message to cell 1, where the RRCReconfigurationComplete message indicates that the terminal device has completed the cell handover.
  • the terminal device before the terminal device performs cell handover, it receives the first message from the first access network device. Before the handover, the terminal device can obtain the configuration of the target cell and the uplink and downlink synchronization in advance, and configure the conditions for handover to the target cell. The information and the TA of the terminal device in the target cell perform cell handover, without spending time to obtain the TA of the terminal device in the target cell; the time delay of cell handover can be further reduced. In addition, the terminal device detects the synchronization signal of the cell 1 to complete the downlink synchronization before the cell 1 fully resumes operation; it can realize the downlink synchronization before switching to the cell 1.
  • the advance synchronization method provided by the embodiment of the present application is used in the cell handover process, which reduces the cell handover delay of the cell, reduces the coverage overlap time of the original cell (ie, cell 2) and the target cell (cell 1), and improves user Experience; the recovery speed of cell 1 from dormancy is accelerated, and the impact of cell dormancy on user experience is reduced. 16 and 17, it can be seen that the advance synchronization method provided by the embodiment of the present application can reduce the coverage overlap time of the original cell and the target cell, and enhance the energy saving effect.

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Abstract

本申请实施例公开了一种提前同步的方法和通信装置，该方法可包括：终端设备接收来自第一接入网设备的第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的时间提前量TA，所述目标小区不属于所述终端设备当前接入的小区；所述终端设备向所述第一接入网设备发送第二消息；所述第二消息指示所述终端设备已完成目标小区配置。本申请实施例中，终端设备接收来自第一接入网设备的第一消息。终端设备在获得目标小区配置信息之前已完成下行同步，并在获得目标小区配置信息时，就可获得终端设备在该目标小区的TA，提前完成上行同步，从而降低小区切换的时延。

Description

提前同步的方法和通信装置
本申请要求于2021年12月15日提交中国专利局、申请号为202111534059.5、申请名称为“提前同步的方法和通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及计算机领域，尤其涉及一种提前同步的方法和通信装置。
背景技术
随着基站能耗不断上升，基站能耗已经成为运营商运营成本居高不下的主要原因之一。如何降低基站能耗，成为一个亟待解决的问题。常见的节能方式之一为在空载或轻载时使小区休眠。通过天线的天面复用，可使小区的覆盖范围扩展，从而使其他小区的休眠行为对覆盖的影响大大降低，增加小区在中轻载时的休眠机会。
在多小区场景中，当网络负载较重时，所有小区都正常运行以保证容量；当网络负载较轻时，可令一部分小区的覆盖范围扩展，另一部分的小区休眠，从而达到用户体验无损的节能效果。
在小区休眠的背景下，为不影响用户设备(user equipment，UE)通信体验，需预先扩展其他小区的覆盖，待小区切换完成再进行休眠。当前采用的小区切换流程存在时延较大的问题。当小区切换流程的时延较大时，一方面会导致原小区和目标小区的覆盖重叠时间长，信号干扰增多；另一方面影响了小区休眠的速度，影响节能效果。因此研究如何减少小区切换的时延的方案。
发明内容
本申请实施例公开了一种提前同步的方法和通信装置，终端设备在网络设备向其发起小区切换之前完成上下行同步，可降低小区切换的时延。
第一方面，本申请实施例提供一种提前同步的方法，该方法包括：终端设备接收来自第一接入网设备的第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的时间提前量(timing advance，TA)，所述目标小区不属于所述终端设备当前接入的小区；所述终端设备向所述第一接入网设备发送第二消息；所述第二消息指示所述终端设备已完成所述目标小区的配置。第一接入网设备可以属于终端设备的当前接入的小区对应的实体。所述目标小区可属于所述终端设备当前待接入的小区。可理解，所述终端设备待从当前接入的小区切换至目标小区。
本申请实施例中，终端设备接收来自第一接入网设备的第一消息。终端设备根据第一消息可获取其在目标小区的TA，进而提前完成上行同步，能够降低小区切换的时延。
在一种可能的实现方式中，所述第一消息为无线资源控制(radio resource control，RRC)重配置消息，所述第二消息为RRC重配置完成消息。
在该实现方式中，RRC重配置(RRCReconfiguration)消息用于终端设备获得其在目标 小区的TA。终端设备根据第一消息，在未接入目标小区之前，可完成上行同步，即提前完成上行同步。另外，第一消息为RRCReconfiguration，可更好地兼容已有的信令。终端设备向第一接入网设备发送RRC重配置完成消息(RRCReconfigurationComplete)可通知该第一接入网设备，该终端设备已完成目标小区的配置。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据第一消息可快速、准确地获得目标小区的TA和/或该目标小区的配置信息。
在一种可能的实现方式中，在终端设备接收来自第一接入网设备的第一消息之前，所述方法还包括：所述终端设备接收来自所述第一接入网设备的第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行对目标小区的同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在该实现方式中，终端设备接收来自所述第一接入网设备的第一指示信息和第二指示信息，以便及时进行对目标小区的同步相关操作，并获取向目标小区发送上行信号可用的时频资源。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在该实现方式中，第一指示信息和第二指示信息承载于同一消息；可以节省信令开销。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在该实现方式中，第一指示信息和第二指示信息承载于不同的消息。由于第一指示信息和第二指示信息的作用不同，并且格式也不同，因此第一指示信息和第二指示信息更适合承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、媒体访问控制(media access control，MAC)控制元素(control element，CE)、下行控制信息(downlink control information，DCI)中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在该实现方式中，第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种；第二指示信息承载于RRC重配置消息、MACCE、DCI中的任一种；通过利用已有的信令来承载第一指示信息和第二指示信息，减少对已有通信系统的影响。
在一种可能的实现方式中，所述终端设备接收所述第一指示信息之前，所述目标小区已完成同步波束覆盖。
在该实现方式中，终端设备接收第一指示信息之前，所述目标小区已完成同步波束覆盖。
在一种可能的实现方式中，所述终端设备接收所述第一指示信息之前，所述目标小区已完成同步波束覆盖，所述目标小区的覆盖未完成。
由于终端设备在接收到第一指示信息之前，目标小区已完成同步波束覆盖，因此该终端设备在目标小区的覆盖未完成时，可以提前进行同步相关操作，以便减少小区切换的时延。
在一种可能的实现方式中，所述终端设备接收来自所述第一接入网设备的第一指示信息和第二指示信息之后，终端设备接收来自第一接入网设备的第一消息之前，所述方法还包括：所述终端设备检测所述目标小区的同步信号以完成下行同步；所述终端设备根据所述第二指示信息，向所述目标小区发送第一上行信号，所述第一上行信号用于确定所述终端设备在所 述目标小区的TA。
在该实现方式中，终端设备接收来自第一接入网设备的第一消息之前，检测目标小区的同步信号以完成下行同步以及向目标小区发送第一上行信号，能够在配置目标小区之前，完成上下行同步，从而减少小区切换的时延。
在一种可能的实现方式中，所述终端设备根据所述第二指示信息，向所述目标小区发送第一上行信号包括：所述终端设备利用所述第二指示信息指示的时频资源，向所述目标小区发送第一上行信号。
在该实现方式中，终端设备利用第二指示信息指示的时频资源，向目标小区发送第一上行信号，以便目标小区准确地接收到该第一上行信号。本申请中，目标小区执行的任意操作可理解为目标小区对应的实体执行的操作。目标小区是指终端设备待配置的小区(或者说待接入的小区)。
在一种可能的实现方式中，所述终端设备向所述第一接入网设备发送第二消息之前，所述方法还包括：所述终端设备根据所述第一消息，获取所述终端设备在所述目标小区的TA，并完成所述目标小区的配置。
终端设备完成目标小区的配置可视为该终端设备切换至该目标小区。在该实现方式中，终端设备向第一接入网设备发送第二消息终端设备之前，获取目标小区的TA，并完成目标小区的配置；可以更快地完成上行同步，从而减少小区切换的时延。
在一种可能的实现方式中，所述第一消息还包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
在该实现方式中，第三指示信息用于指示终端设备向目标小区切换的条件。终端设备需要切换时，无需网络向终端发送切换信令触发，可减少信令开销。
在一种可能的实现方式中，所述方法还包括：终端对所述条件进行评估；在满足所述条件的情况下，所述终端设备根据所述终端设备在所述目标小区的TA进行小区切换。
在该实现方式中，在满足条件的情况下，终端设备根据终端设备在目标小区的TA进行小区切换；能够及时进行小区切换，并节省信令开销。
在一种可能的实现方式中，所述条件包括以下一项或多项：所述终端设备测量的其当前接入的小区的信号质量低于第一阈值；所述终端设备测量的所述目标小区的信号质量高于或等于第二阈值。
在该实现方式中，可较合理的确定是否需要进行小区切换。
在一种可能的实现方式中，所述满足所述条件的情况包括接收到用于指示满足所述条件的信息。
第二方面，本申请实施例提供另一种提前同步的方法，该方法包括：终端设备接收来自第一接入网设备的RRC重配置消息；所述RRC重配置消息用于所述终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述终端设备向所述第一接入网设备发送RRC重配置完成消息；所述RRC重配置完成消息指示所述终端设备已完成所述目标小区的配置。
本申请实施例中，终端设备接收来自第一接入网设备的RRC重配置消息。终端设备RRC重配置消息，就可获得终端设备在该目标小区的TA，可以提前完成上行同步，从而降低小区切换的时延。
在一种可能的实现方式中，所述RRC重配置消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据该RRC重配置消息可准确、快速地获得终端设备在该目标小区的TA和/或该目标小区的配置信息。
第三方面，本申请实施例提供另一种通信方法，该方法包括：终端设备接收来自第一接入网设备的第一指示信息，所述第一指示信息指示所述终端设备进行同步相关操作；所述终端设备根据所述第一指示信息在目标小区进行同步相关操作；所述终端设备在完成同步相关操作之后，接收来自所述第一接入网设备的第一消息；所述第一消息用于所述终端设备获得所述目标小区的TA。
在该实现方式中，终端设备在完成同步相关操作之后，接收来自第一接入网设备的第一消息。也就是说，终端设备在获得目标小区的配置信息之前，就已完成同步相关操作，因此终端设备完成配置该目标小区(或者说实现小区切换)可以减少上下行同步导致的时延。
在一种可能的实现方式中，所述终端设备根据所述第一指示信息在目标小区进行同步相关操作包括：所述终端设备检测所述目标小区的同步信号以完成下行同步。
在该实现方式中，终端设备接收来自第一接入网设备的第一消息之前，检测目标小区的同步信号以完成下行同步，能够在接收第一消息之前，完成下行同步，从而减少小区切换的时延。
在一种可能的实现方式中，在终端设备接收来自第一接入网设备的第一消息之前，所述方法还包括：所述终端设备接收来自所述第一接入网设备的第二指示信息，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源；所述终端设备根据所述第二指示信息，向所述目标小区发送第一上行信号，所述第一上行信号用于确定所述终端设备在所述目标小区的TA。
在该实现方式中，终端设备在接收来自第一接入网设备的第一消息之前，向目标小区发送第一上行信号。通过在配置目标小区之前，完成上行同步，可以减少小区切换的时延。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在该实现方式中，第一指示信息和第二指示信息承载于同一消息；可以节省信令开销。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在该实现方式中，第一指示信息和第二指示信息承载于不同的消息。由于第一指示信息和第二指示信息的作用不同，并且格式也不同，因此第一指示信息和第二指示信息更适合承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在该实现方式中，第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种；第二指示信息承载于RRC重配置消息、MACCE、DCI中的任一种通过利用已有的信令来承载第一指示信息，减少对已有通信系统的影响。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据该第一消息可准确、快速地获得终端设备在该目标小区的TA和/或该目标小区的配置信息。
第四方面，本申请实施例提供另一种提前同步的方法，包括：第一接入网设备向终端设备发送第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的TA，所述 目标小区不属于所述终端设备当前接入的小区；所述第一接入网设备接收来自所述终端设备的第二消息，所述第二消息指示所述终端设备已完成所述目标小区的配置。第一接入网设备可以属于终端设备的当前接入的小区对应的实体。
本申请实施例中，第一消息用于终端设备获得该终端设备在目标小区的TA。第一接入网设备向终端设备发送第一消息，可以使得该终端设备获得包含该终端设备在该目标小区的TA，以便该终端设备提前完成上行同步，从而降低小区切换的时延。
在一种可能的实现方式中，所述第一消息为无线资源控制RRC重配置消息，所述第二消息为RRC重配置完成消息。
在该实现方式中，RRC重配置消息用于终端设备获得其在目标小区的TA。终端设备根据第一消息，在未接入目标小区之前，可完成上行同步，即提前完成上行同步。另外，第一消息为RRCReconfiguration，可更好地兼容已有的信令。终端设备向第一接入网设备发送RRC重配置完成消息(RRCReconfigurationComplete)可通知该第一接入网设备，该终端设备已完成目标小区的配置。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据第一消息可快速、准确地获得目标小区的TA和/或该目标小区的配置信息。
在一种可能的实现方式中，在第一接入网设备向终端设备发送第一消息之前，所述方法还包括：所述第一接入网设备向所述终端设备发送第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在该实现方式中，第一接入网设备向终端设备发送第一指示信息和第二指示信息，以便指示该终端设备在配置目标小区之前，及时进行同步相关操作。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在该实现方式中，第一指示信息和第二指示信息承载于同一消息；可以节省信令开销。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在该实现方式中，第一指示信息和第二指示信息承载于不同的消息。由于第一指示信息和第二指示信息的作用不同，并且格式也不同，因此第一指示信息和第二指示信息更适合承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在该实现方式中，第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种；第二指示信息承载于RRC重配置消息、MACCE、DCI中的任一种通过利用已有的信令来承载第一指示信息，减少对已有通信系统的影响。
在一种可能的实现方式中，所述第一接入网设备向所述终端设备发送第一指示信息包括：所述第一接入网设备在所述目标小区已完成同步波束覆盖之后，向所述终端设备发送所述第一指示信息。
在该实现方式中，第一接入网设备在目标小区已完成同步波束覆盖之后，向终端设备发送第一指示信息；可以及时向终端设备发送第一指示信息，并保证该终端设备接收到该第一 指示信息后，可以实现下行同步。
在一种可能的实现方式中，所述第一接入网设备向所述终端设备发送第一指示信息之后，在第一接入网设备向终端设备发送第一消息之前，所述方法还包括：所述第一接入网设备接收来自所述终端设备的第一上行信号；所述第一上行信号用于获取所述终端设备在所述目标小区的TA，所述第一接入网设备属于所述目标小区对应的实体；或者，所述第一接入网设备接收来自第二接入网设备的第三消息，所述第三消息包含所述终端设备在所述目标小区的TA，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备和所述第二接入网设备属于不同的实体。
在该实现方式中，在第一接入网设备向终端设备发送第一消息之前，第一接入网设备接收来自终端设备的第一上行信号或者接收来自第二接入网设备的第三消息，以便获取终端设备在目标小区的TA。这样第一接入网设备就可在第一消息中携带用于获取终端设备在目标小区的TA的信息，以便该终端设备在获得目标小区的配置信息时，就能获得终端设备在目标小区的TA的信息。
在一种可能的实现方式中，所述第一消息包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
在该实现方式中，第三指示信息用于指示终端设备向目标小区切换的条件。终端设备需要切换时，无需网络向终端发送切换信令触发，可减少信令开销。
在一种可能的实现方式中，在向终端设备发送第一消息之后，所述方法还包括：在所述终端设备当前接入的小区休眠或恢复覆盖之前，向所述终端设备发送用于指示满足所述条件的信息。
在该实现方式中，可以使得终端设备及时进行小区切换。
第五方面，本申请实施例提供另一种提前同步的方法，包括：第一接入网设备向终端设备发送RRC重配置消息；所述RRC重配置消息用于所述终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述第一接入网设备接收来自所述终端设备的RRC重配置完成消息，所述RRC重配置消息指示所述终端设备已完成所述目标小区的配置。第一接入网设备可以属于终端设备的当前接入的小区对应的实体。
本申请实施例中，RRC重配置消息用于终端设备获得该终端设备在该目标小区的TA。第一接入网设备向终端设备发送RRC重配置消息，可以使得该终端设备获得该终端设备在该目标小区的TA，以便该终端设备提前完成上行同步，从而降低小区切换的时延。
在一种可能的实现方式中，所述RRC重配置消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据RRC重配置消息可快速、准确地获得终端设备在目标小区的TA和/或该目标小区的配置信息。
第六方面，本申请实施例提供另一种提前同步的方法，包括：第一接入网设备向终端设备发送第一指示信息之后，向所述终端设备发送第一消息；所述第一指示信息指示所述终端设备在目标小区进行同步相关操作；所述第一消息用于所述终端设备获得所述目标小区的配置信息。
本申请实施例中，第一接入网设备向终端设备发送第一指示信息之后，向终端设备发送第一消息；这样该终端设备在接收到该第一消息之前，就可进行同步相关操作，从而减少在小区切换中由上下行同步导致的时延。
在一种可能的实现方式中，在向所述终端设备发送第一消息之前，所述方法还包括：所 述第一接入网设备向所述终端设备发送第二指示信息，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在该实现方式中，第一接入网设备在向终端设备发送第一消息之前，向终端设备发送第二指示信息；以便终端设备根据第二指示信息在接到第一消息之前，获取该终端设备向目标小区发送上行信号可用的时频资源。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在该实现方式中，第一指示信息和第二指示信息承载于同一消息；可以节省信令开销。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在该实现方式中，第一指示信息和第二指示信息承载于不同的消息。由于第一指示信息和第二指示信息的作用不同，并且格式也不同，因此第一指示信息和第二指示信息更适合承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在该实现方式中，第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种；第二指示信息承载于RRC重配置消息、MACCE、DCI中的任一种通过利用已有的信令来承载第一指示信息，减少对已有通信系统的影响。
在一种可能的实现方式中，所述第一接入网设备向所述终端设备发送第一指示信息之后，在向终端设备发送第一消息之前，所述方法还包括：所述第一接入网设备接收来自所述终端设备的第一上行信号；所述第一上行信号用于获取所述终端设备在所述目标小区的TA，所述第一接入网设备属于所述目标小区对应的实体；或者，所述第一接入网设备接收来自第二接入网设备的第三消息，所述第三消息包含所述终端设备在所述目标小区的TA，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备和所述第二接入网设备属于不同的实体。
在该实现方式中，在第一接入网设备向终端设备发送第一消息之前，第一接入网设备接收来自终端设备的第一上行信号或者接收来自第二接入网设备的第三消息，以便获取终端设备在目标小区的TA。这样第一接入网设备就可在第一消息中携带用于获取终端设备在目标小区的TA的信息，以便该终端设备在获得目标小区的配置信息时，就能获得终端设备在目标小区的TA的信息。
在一种可能的实现方式中，所述第一消息还用于所述终端设备获得所述终端设备在所述目标小区的TA。
在该实现方式中，第一消息还用于终端设备获得其在目标小区的TA。终端设备根据第一消息在未接入目标小区之前，获得该终端设备在该目标小区的TA，以便该终端设备提前实现在目标小区的上行同步，进而减少小区切换的时延。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，终端设备根据第一消息可直接获得终端设备在目标小区的TA和/或该目标小区的配置信息。
第七方面，本申请实施例提供另一种提前同步的方法，包括：第二接入网设备向第一接入网设备发送第三消息，所述第三消息用于所述第一接入网设备获得终端设备在目标小区的 TA，所述目标小区不属于所述终端设备当前接入的小区，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备属于所述终端设备当前接入的小区对应的实体。所述第二接入网设备和所述第二接入网设备属于不同的实体。
本申请实施例中，第二接入网设备向第一接入网设备发送第三消息；能够使得该第一接入网设备获得终端设备在目标小区的TA，进而提前完成该终端设备在目标小区的上行同步，从而减少小区切换的时延。
在一种可能的实现方式中，在第二接入网设备向第一接入网设备发送第三消息之前，所述方法还包括：所述第二接入网设备接收来自所述终端设备的第一上行信号；所述第二接入网设备根据所述第一上行信号，确定所述终端设备在所述目标小区的TA。
在该实现方式中，第二接入网设备根据第一上行信号，确定终端设备在目标小区的TA；以便提前完成在目标小区的上行同步，从而减少小区切换的时延。
在一种可能的实现方式中，所述第三消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在该实现方式中，第二接入网设备向第一接入网设备发送第三消息，可以使得该第一接入网设备直接获得终端设备在目标小区的TA和/或该目标小区的配置信息。
在一种可能的实现方式中，所述方法还包括：对所述目标小区的部分或全部波束覆盖进行展宽；在完成对所述目标小区的波束覆盖进行展宽之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
在该实现方式中，可以使得终端设备及时进行小区切换。
在一种可能的实现方式中，所述方法还包括：在完全恢复所述目标小区的运行之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
在该实现方式中，可以使得终端设备及时进行小区切换。
第八方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第一方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述收发模块，用于接收来自第一接入网设备的第一消息；所述第一消息用于终端设备(即第九方面的通信装置)获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述收发模块，还用于向所述第一接入网设备发送第二消息；所述第二消息指示所述终端设备已完成所述目标小区的配置。
在一种可能的实现方式中，所述第一消息为RRC重配置消息，所述第二消息为RRC重配置完成消息。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在一种可能的实现方式中，所述收发模块，还用于在接收来自所述第一接入网设备的所述第一消息之前，接收来自所述第一接入网设备的第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在一种可能的实现方式中，所述终端设备接收所述第一指示信息之前，所述目标小区已完成同步波束覆盖。
在一种可能的实现方式中，所述通信装置还包括：处理模块，用于在所述收发模块接收来自所述第一接入网设备的所述第一消息之前，检测所述目标小区的同步信号以完成下行同步；所述处理模块，还用于根据所述第二指示信息，控制所述收发模块向所述目标小区发送第一上行信号，所述第一上行信号用于确定所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述处理模块，具体用于控制所述收发模块利用所述第二指示信息指示的时频资源，向所述目标小区发送第一上行信号。
在一种可能的实现方式中，所述处理模块，还用于在所述收发模块向所述第一接入网设备发送第二消息之前，根据所述第一消息，完成所述目标小区的配置，并获取所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述第一消息还包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
在一种可能的实现方式中，所述处理模块，还用于对所述条件进行评估；在满足所述条件的情况下，根据所述终端设备在所述目标小区的TA进行小区切换。
在一种可能的实现方式中，所述条件包括以下一项或多项：所述终端设备测量的其当前接入的小区的信号质量低于第一阈值；所述终端设备测量的所述目标小区的信号质量高于或等于第二阈值。
在一种可能的实现方式中，所述满足所述条件的情况包括接收到用于指示满足所述条件的信息。
关于第八方面的各种可能的实施方式所带来的技术效果，可参考对于第一方面或第一方面的各种可能的实施方式的技术效果的介绍。
第九方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第二方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述收发模块，用于接收来自第一接入网设备的RRC重配置消息；所述RRC重配置消息用于终端设备(即第十方面的通信装置)获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述收发模块，还用于向所述第一接入网设备发送RRC重配置完成消息；所述RRC重配置完成消息指示所述终端设备已完成所述目标小区的配置。
在一种可能的实现方式中，所述RRC重配置消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
关于第九方面的各种可能的实施方式所带来的技术效果，可参考对于第二方面或第二方面的各种可能的实施方式的技术效果的介绍。
第十方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第三方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块和处理模块，其中：所述收发模块，用于接收来自第一接入网设备的第一指示信息，所述第一指示信息指示终端设备(即第十一方面的通信装置)进行同步相关操作；所 述处理模块，用于根据所述第一指示信息在目标小区进行同步相关操作；所述收发模块，还用于在所述处理模块完成同步相关操作之后，接收来自所述第一接入网设备的第一消息；所述第一消息用于所述终端设备获得所述目标小区的配置信息。
在一种可能的实现方式中，所述处理模块，具体用于检测所述目标小区的同步信号以完成下行同步。
在一种可能的实现方式中，所述收发模块，还用于在接收来自第一接入网设备的第一消息之前，接收来自所述第一接入网设备的第二指示信息，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源；所述处理模块，还用于根据所述第二指示信息，控制所述收发模块向所述目标小区发送第一上行信号，所述第一上行信号用于确定所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
关于第十方面的各种可能的实施方式所带来的技术效果，可参考对于第三方面或第三方面的各种可能的实施方式的技术效果的介绍。
第十一方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第四方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述收发模块，用于向终端设备发送第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述收发模块，还用于接收来自所述终端设备的第二消息，所述第二消息指示所述终端设备已完成所述目标小区的配置。
在一种可能的实现方式中，所述第一消息为无线资源控制RRC重配置消息，所述第二消息为RRC重配置完成消息。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在一种可能的实现方式中，所述收发模块，还用于在向终端设备发送所述第一消息之前，向所述终端设备发送第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在一种可能的实现方式中，所述收发模块，具体用于在所述目标小区已完成同步波束覆盖之后，向所述终端设备发送所述第一指示信息。
在一种可能的实现方式中，所述收发模块，还用于在向终端设备发送第一消息之前，接收来自所述终端设备的第一上行信号；所述第一上行信号用于获取所述终端设备在所述目标小区的TA，所述第一接入网设备属于所述目标小区对应的实体；或者，所述收发模块，还用于在向终端设备发送第一消息之前，接收来自第二接入网设备的第三消息，所述第三消息包含所述终端设备在所述目标小区的TA，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备和所述第二接入网设备属于不同的实体。
在一种可能的实现方式中，所述第一消息包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
在一种可能的实现方式中，所述收发模块，还用于在所述终端设备当前接入的小区休眠或恢复覆盖之前，向所述终端设备发送用于指示满足所述条件的信息。
关于第十一方面的各种可能的实施方式所带来的技术效果，可参考对于第四方面或第四方面的各种可能的实施方式的技术效果的介绍。
第十二方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第五方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述收发模块，用于向终端设备发送RRC重配置消息；所述RRC重配置消息用于所述终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；所述收发模块，还用于接收来自所述终端设备的RRC重配置完成消息，所述RRC重配置消息指示所述终端设备已完成所述目标小区的配置。第一接入网设备可以属于终端设备的当前接入的小区对应的实体。
在一种可能的实现方式中，所述RRC重配置消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
关于第十二方面的各种可能的实施方式所带来的技术效果，可参考对于第五方面或第五方面的各种可能的实施方式的技术效果的介绍。
第十三方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第六方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述收发模块，用于向终端设备发送第一指示信息之后，向所述终端设备发送第一消息；所述第一指示信息指示所述终端设备在目标小区进行同步相关操作；所述第一消息用于所述终端设备获得所述目标小区的配置信息。
在一种可能的实现方式中，所述收发模块，还用于在向所述终端设备发送所述第一消息之前，向所述终端设备发送第二指示信息，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于同一条RRC重配置消息。
在一种可能的实现方式中，所述第一指示信息和所述第二指示信息承载于不同的消息。
在一种可能的实现方式中，所述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，所述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
在一种可能的实现方式中，所述收发模块，还用于在向终端设备发送第一消息之前，接收来自所述终端设备的第一上行信号；所述第一上行信号用于获取所述终端设备在所述目标小区的TA，所述第一接入网设备属于所述目标小区对应的实体；或者，所述收发模块，还用于在向终端设备发送第一消息之前，接收来自第二接入网设备的第三消息，所述第三消息包含所述终端设备在所述目标小区的TA，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备和所述第二接入网设备属于不同的实体。
在一种可能的实现方式中，所述第一消息还用于所述终端设备获得所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
关于第十三方面的各种可能的实施方式所带来的技术效果，可参考对于第六方面或第六方面的各种可能的实施方式的技术效果的介绍。
第十四方面，本申请实施例提供一种通信装置，该通信装置具有实现上述第七方面方法实施例中的行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块或单元。在一种可能的实现方式中，包括收发模块，其中：所述处理模块，用于向第一接入网设备发送第三消息，所述第三消息用于所述第一接入网设备获得终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区，第二接入网设备(即第十四方面中的通信装置)属于所述目标小区对应的实体，所述第一接入网设备属于所述终端设备当前接入的小区对应的实体。
在一种可能的实现方式中，所述收发模块，还用于接收来自所述终端设备的第一上行信号；所述通信装置还包括：处理模块，还用于根据所述第一上行信号，确定所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述收发模块，还用于向所述终端设备发送第一消息；所述第一消息用于所述终端设备获得所述目标小区的配置信息和所述终端设备在所述目标小区的TA。
在一种可能的实现方式中，所述第三消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
在一种可能的实现方式中，所述处理模块，还用于对所述目标小区的部分或全部波束覆盖进行展宽；所述收发模块，还用于在完成对所述目标小区的波束覆盖进行展宽之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
在一种可能的实现方式中，所述收发模块，还用于在完全恢复所述目标小区的运行之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
关于第十四方面的各种可能的实施方式所带来的技术效果，可参考对于第七方面或第七方面的各种可能的实施方式的技术效果的介绍。
第十五方面，本申请提供一种通信装置，该通信装置包括处理器，该处理器可以用于执行存储器所存储的计算机执行指令，以使上述第一方面或第一方面的任意可能的实现方式所示的方法被执行，或者以使上述第二方面或第二方面的任意可能的实现方式所示的方法被执行，或者以使上述第三方面或第三方面的任意可能的实现方式所示的方法被执行，或者以使上述第四方面或第四方面的任意可能的实现方式所示的方法被执行，或者以使上述第五方面或第五方面的任意可能的实现方式所示的方法被执行，或者以使上述第六方面或第六方面的任意可能的实现方式所示的方法被执行，或者以使上述第七方面或第七方面的任意可能的实 现方式所示的方法被执行。
本申请实施例中，在执行上述方法的过程中，上述方法中有关发送信息的过程，可以理解为基于处理器的指令进行输出信息的过程。在输出信息时，处理器将信息输出给收发器，以便由收发器进行发射。该信息在由处理器输出之后，还可能需要进行其他的处理，然后到达收发器。类似的，处理器接收输入的信息时，收发器接收该信息，并将其输入处理器。更进一步的，在收发器收到该信息之后，该信息可能需要进行其他的处理，然后才输入处理器。
对于处理器所涉及的发送和/或接收等操作，如果没有特殊说明，或者，如果未与其在相关描述中的实际作用或者内在逻辑相抵触，则可以一般性的理解为基于处理器的指令输出。
在实现过程中，上述处理器可以是专门用于执行这些方法的处理器，也可以是执行存储器中的计算机指令来执行这些方法的处理器，例如通用处理器等。例如，处理器还可以用于执行存储器中存储的程序，当该程序被执行时，使得该通信装置执行如上述第一方面或第一方面的任意可能的实现方式所示的方法。在一种可能的实现方式中，存储器位于上述通信装置之外。在一种可能的实现方式中，存储器位于上述通信装置之内。
本申请实施例中，处理器和存储器还可能集成于一个器件中，即处理器和存储器还可能被集成于一起。
在一种可能的实现方式中，通信装置还包括收发器，该收发器，用于接收报文或发送报文等。
第十六方面，本申请提供另一种通信装置，该通信装置包括处理电路和接口电路，该接口电路用于获取数据或输出数据；处理电路用于执行如上述第一方面或第一方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第二方面或第二方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第三方面或第三方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第四方面或第四方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第五方面或第五方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第六方面或第六方面的任意可能的实现方式所示的相应的方法，或者处理电路用于执行如上述第七方面或第七方面的任意可能的实现方式所示的相应的方法。
第十七方面，本申请提供一种计算机可读存储介质，该计算机可读存储介质用于存储计算机程序，当其在计算机上运行时，使得上述第一方面或第一方面的任意可能的实现方式所示的方法被执行，或者使得上述第二方面或第二方面的任意可能的实现方式所示的方法被执行，或者使得上述第三方面或第三方面的任意可能的实现方式所示的方法被执行，或者使得上述第四方面或第四方面的任意可能的实现方式所示的方法被执行，或者使得上述第五方面或第五方面的任意可能的实现方式所示的方法被执行，或者使得上述第六方面或第六方面的任意可能的实现方式所示的方法被执行，或者使得上述第七方面或第七方面的任意可能的实现方式所示的方法被执行。
第十八方面，本申请提供一种计算机程序产品，该计算机程序产品包括计算机程序或计算机代码，当其在计算机上运行时，使得上述第一方面或第一方面的任意可能的实现方式所示的方法被执行，或者使得上述第二方面或第二方面的任意可能的实现方式所示的方法被执行，或者使得上述第三方面或第三方面的任意可能的实现方式所示的方法被执行，或者使得上述第四方面或第四方面的任意可能的实现方式所示的方法被执行，或者使得上述第五方面或第五方面的任意可能的实现方式所示的方法被执行，或者使得上述第六方面或第六方面的任意可能的实现方式所示的方法被执行，或者使得上述第七方面或第七方面的任意可能的实 现方式所示的方法被执行。
第十九方面，本申请提供一种通信系统，包括上述第八方面至第十方面的任意可能的实现方式所述通信装置、上述第十一方面至第十三方面的任意可能的实现方式所述通信装置以及上述第十四方面的任意可能的实现方式所述通信装置。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1A为本申请实施例提供的一种小区休眠/恢复场景的示例；
图1B为本申请实施例提供的一种辅载波小区休眠/恢复场景的示例；
图2为本申请实施例提供的一种提前同步的方法流程图；
图3为本申请实施例提供的另一种提前同步的方法流程图；
图4为本申请实施例提供的另一种提前同步的方法流程；
图5为本申请实施例提供的另一种提前同步的方法流程；
图6为本申请实施例提供的另一种提前同步的方法流程；
图7为本申请实施例提供的另一种提前同步的方法流程；
图8为本申请实施例提供的一种小区切换的方法流程图；
图9为本申请实施例提供的另一种小区切换的方法流程图；
图10为本申请实施例提供的一种辅载波小区切换的方法流程图；
图11为本申请实施例提供的一种辅载波小区切换的方法流程图；
图12示出了一种通信装置1200的结构示意图；
图13为本申请实施例提供的另一种通信装置130的结构示意图；
图14为本申请实施例提供的另一种通信装置140的结构示意图；
图15为本申请实施例提供的另一种提前同步的方法流程图；
图16为本申请实施例提供的另一种提前同步的方法流程图；
图17为本申请实施例提供的另一种提前同步的方法流程图。
具体实施方式
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等仅用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备等，没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元等，或可选地还包括对于这些过程、方法、产品或设备等固有的其它步骤或单元。
在本文中提及的“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员可以显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
本申请以下实施例中所使用的术语只是为了描述特定实施例的目的，而并非旨在作为对本申请的限制。如在本申请的说明书和所附权利要求书中所使用的那样，单数表达形式“一个”、“一种”、“所述”、“上述”、“该”和“这一”旨在也包括复数表达形式，除非其上下文 中明确地有相反指示。还应当理解，本申请中使用的术语“和/或”是指并包含一个或多个所列出项目的任何或所有可能组合。例如，“A和/或B”可以表示：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。本申请中使用的术语“多个”是指两个或两个以上。
如背景技术部分所述，目前需要研究如何减少小区切换的时延的方案。本申请提供了可减少小区切换的时延的方案。本申请提供的可减少小区切换的时延的方案的主要原理是：在小区完成覆盖展宽(或者说扩展)或完全恢复运行之前，终端设备进行预同步，从而在小区完成覆盖展宽或完全恢复运行后，能迅速完成小区的切换。也就是说，终端设备可以在小区完成覆盖展宽或完全恢复运行之前，先完成终端设备在该小区的一部分或者全部同步操作，这样就能减少小区切换中由上下行同步导致的时延。
以下将详细介绍本申请涉及的网络架构。
本申请提供的技术方案可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第四代(4th generation，4G)通信系统、非陆地通信网络(non-terrestrial network，NTN)系统、第五代(5th generation，5G)通信系统或新无线(new radio，NR)以及未来的其他通信系统，如6G等。本申请提供的技术方案可用于解决多载波多小区网络场景或单载波多小区网络场景中，小区切换的时延较长的问题。下面以5G通信系统中的小区休眠/恢复场景为例，介绍本申请提供的技术方案。
图1A为本申请实施例提供的一种小区休眠/恢复场景的示例。如图1A所示，考虑UE已接入小区1；当小区1满足休眠条件时，需使小区1休眠，小区2展宽。因此UE需执行小区切换，由小区1切换至小区2。如图1A所示，考虑UE已接入展宽小区2(完成展宽的小区2)；当小区1满足恢复条件，需使小区2的覆盖复原，重启小区1。因此UE需执行小区切换，由小区2切换至小区1。小区1和小区2可以对应同一个实体(或者说共站)，也可以对应于不同的实体(或者说非共站)。
图1B为本申请实施例提供的一种辅载波小区休眠/恢复场景的示例。如图1B所示，考虑UE已接入主载波小区1和辅载波小区1；当辅载波小区1满足休眠条件，需使辅载波小区1休眠，辅载波小区2展宽。因此UE需执行小区切换，由辅载波小区1切换至辅载波小区2。如图1B所示，考虑UE已接入主载波小区1和展宽辅载波小区2(完成展宽的辅载波小区2)；当辅载波小区1满足恢复条件时，需使辅载波小区2的覆盖复原，重启辅载波小区1。因此UE需执行小区切换，由辅载波小区2切换至辅载波小区1。主载波小区1和辅载波小区2可以对应同一个实体(或者说共站)，也可以对应于不同的实体(或者说非共站)。
本申请实施例中，主载波小区、辅载波小区、单载波小区对应的实体均可以为接入网设备。接入网设备可以是任意一种具有无线收发功能且能和用户设备通信的设备，例如将用户设备接入到无线网络的无线接入网(radio access network，RAN)节点。目前，一些RAN节点的举例包括：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)、无线保真(wireless fidelity，Wifi)接入点(access point，AP)、接入回传一体化(integrated access  and backhaul，IAB)等。本申请中以基站作为接入网设备的示例进行描述。
用户设备((user equipment，UE))是一种具有无线收发功能的设备。用户设备可经无线接入网(radioaccess network，RAN)中的接入网设备(或者称为接入设备)与一个或多个核心网(core network，CN)设备(或者称为核心设备)进行通信。用户设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。本申请实施例中，UE也可称为终端设备，可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程医疗(remote medical)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端等。可选的，用户设备可以是具有无线通信功能的手持设备、车载设备、可穿戴设备或物联网、车联网中的终端、5G网络以及未来网络中的任意形态的终端等，本申请对此并不限定。接入网设备可以是任意一种具有无线收发功能且能和用户设备通信的设备，例如将用户设备接入到无线网络的无线接入网(radio access network，RAN)节点。目前，一些RAN节点的举例包括：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)、无线保真(wireless fidelity，Wifi)接入点(access point，AP)、接入回传一体化(integrated access and backhaul，IAB)等。
为更清楚的描述本申请实施例提供的技术方案，下面先介绍一些本申请实施例涉及一些技术特征。
小区切换
在UE发生位置变化或小区服务质量发生变化时，UE需要变更到其他的小区以保证连接态下的业务质量，这一过程称为小区切换。
以下介绍一种多载波多小区环境下辅载波小区切换的流程。需要注意的是：多载波配置下辅载波小区的控制信息由UE所在主载波小区发送。一种多载波多小区环境下辅载波小区切换的流程示例如下：
1、主载波小区通过RRCReconfiguration消息传递测量配置信息给UE。
2、UE回复RRCReconfigurationComplete消息，并根据测量配置信息进行辅载波小区的相关的测量，以及生成测量结果。
3、UE将测量结果通过测量报告上报给主载波小区。
4、主载波小区选定合适的新辅载波小区，并给UE发送RRCReconfiguration消息。
RRCReconfiguration消息包括主载波小区选定的新辅载波小区(后续称目标辅载波小区)的配置信息、专用前导(preamble)等信息。
5、UE扫描目标辅载波小区的同步信号块(synchronization signal block，SSB)波束进行下行同步、获取系统信息等操作。
6、UE在目标辅载波小区携带专用preamble发起非竞争随机接入(random access)消息。
随机接入(random access)消息可称为Message 1(MSG1)。
7、目标辅载波小区回复随机接入回复消息(random access response)。
随机接入回复消息包括TA命令。随机接入回复消息(random access response)可称为Message 2(MSG1)。TA命令用于实现基站侧的时间同步，即上行同步。
8、UE进行下行同步并回复RRCReconfigurationComplete。
RRCReconfigurationComplete指示UE完成小区切换，即切换至目标辅载波小区。
上行同步
小区(主载波小区、辅载波小区或单载波小区)内不同的UE与基站之间的距离不同，因此不同UE的上行信号到达基站的时间也有所差异。这种差异，会导致小区内不同UE的上行信号之间产生干扰。为了减少这种干扰，应该使得小区内不同UE的上行信号到达基站的时刻尽量对齐。通常采用上行“定时提前(timing advance，TA)”机制来实现基站侧的时间同步，即上行同步。
TA的原理是：给UE配置一个定时提前量(即TA值)，UE发送上行数据时按照配置的TA值调整上行定时。通过合理配置不同UE的TA值，可以实现不同UE的上行信号到达基站的时刻大致相同。
基站通过测量UE发送的前导信号(preamble)或者上行探测参考信号(sounding reference signal，SRS)等上行信号，可以计算出UE的TA值。基站向UE发送定时提前指令(timing advance command，TAC)，将TA值告知UE。TAC可以承载于MAC CE中。
下行同步
下行同步，是指UE侧的同步，即UE获得基站的定时和频率等。UE通过接收基站发送的同步信号来实现下行同步。5G同步信号，可包括主同步信号(primary synchronization signal，PSS)和辅同步信号(secondary synchronization signal，SSS)，承载于同步信号块(synchronization signal block，SSB)中。小区通常周期性发送SSB，UE搜索并接收SSB以获得下行同步。
本申请实施例提供的提前同步的方法，可减少小区切换的时延。下面结合附图介绍本申请实施例提供的提前同步的方法。
图2为本申请实施例提供的一种提前同步的方法流程图。如图2所示，该方法包括：
201、终端设备接收来自第一接入网设备的第一消息。
第一消息用于终端设备获得该终端设备在目标小区的TA。在一种可能的实现方式中，上述第一消息包含上述终端设备在目标小区的TA以及该目标小区的标识。上述第一消息还可包含目标小区的配置信息。在一种可能的实现方式中，上述第一消息为无线资源控制RRC重配置消息，即RRCReconfiguration消息。
第一接入网设备可以是终端设备当前接入的小区对应的实体。本申请中，小区(例如目标小区或其他小区)的状态可分为四种，第一种为正常工作状态，第二种是休眠状态，第三种是覆盖扩展状态，第四种状态是中间状态。小区处于正常工作状态时，小区正常运行(其覆盖为未展宽前的覆盖)，例如图1A中的小区2(左边)以及图1B中的辅载波小区2(左边)。小区处于休眠状态时，该小区休眠。小区处于覆盖扩展状态是指小区完成展宽(或者说覆盖范围完成扩展)的状态，例如图1A中的小区2(右边)以及图1B中的辅载波小区2(右边)。小区处于中间状态包括小区从休眠状态切换至正常工作状态之间的状态，以及小区从正常工作状态切换至覆盖扩展状态之间的状态。
目标小区可以是终端设备待接入的小区。可理解，终端设备待从当前接入的小区切换至目标小区。举例来说，终端设备已接入小区1；小区1待进入休眠状态，小区2展宽(即小区2的覆盖范围扩展)；该终端设备需执行小区切换，由小区1切换至小区2；其中，小区2为目标小区，小区1为该终端设备当前接入的小区。又举例来说，小区1处于休眠状态，小 区2处于覆盖扩展状态；UE已接入小区2；小区2即将复原(取消扩展)，并恢复(重启)小区1的运行；UE需执行小区切换，由小区2切换至小区1；其中，小区1为目标小区，小区2为该终端设备当前接入的小区。又举例来说，终端设备已接入主载波小区1和辅载波小区1；辅载波小区1待进入休眠状态，辅载波小区2展宽(即辅载波小区2的覆盖范围扩展)；该终端设备需执行小区切换，由辅载波小区1切换至辅载波小区2；其中，辅载波小区2为目标小区，辅载波小区1为该终端设备当前接入的辅载波小区。又举例来说，主载波小区1、主载波小区2处于正常工作状态，辅载波小区1处于休眠状态，辅载波小区2处于覆盖扩展状态；UE已接入主载波小区1和辅载波小区2；辅载波小区2即将复原(取消扩展)，并恢复(重启)辅载波小区1的运行；UE需执行小区切换，由辅载波小区2切换至辅载波小区1；其中，辅载波小区1为目标小区，辅载波小区2为该终端设备当前接入的辅载波小区。
202、终端设备向第一接入网设备发送第二消息。
上述第二消息指示上述终端设备已完成上述目标小区的配置。在一种可能的实现方式中，第二消息为RRC重配置完成消息，即RRCReconfigurationComplete消息。
本申请实施例中，终端设备接收来自第一接入网设备的第一消息。终端设备根据第一消息可获取其在目标小区的TA，进而提前完成上行同步，能够降低辅载波小区切换的时延。
图3为本申请实施例提供的另一种提前同步的方法流程图。图3中的方法流程为图2中描述的方法的一种可能的实现方式。如图3所示，该方法流程包括：
301、终端设备接收来自第一接入网设备的第一指示消息和第二指示信息。
上述第一指示信息指示上述终端设备进行同步相关操作，上述第二指示信息指示上述终端设备向上述目标小区发送上行信号可用的时频资源。本申请中，同步相关操作包括上行同步和/或下行同步。第一接入网设备为终端设备当前接入的小区对应的实体。
在终端设备接收上述第一指示信息之前，上述目标小区已完成同步波束覆盖；这样该终端设备在接收到该第一指示信息之后，才能够实现同步相关操作，例如下行同步。
在一种可能的实现方式中，第一指示消息和第二指示信息承载于同一条消息，例如RRC重配置消息或者其他消息。在该实现方式中，第一指示信息和第二指示信息承载于同一消息；可以节省信令开销。
在一种可能的实现方式中，第一指示消息和第二指示信息承载于不同的消息。由于第一指示信息和第二指示信息的作用不同，并且格式也不同，因此第一指示信息和第二指示信息更适合承载于不同的消息。例如，上述第一指示信息承载于RRC重配置消息、MACCE、DCI中的任一种，上述第二指示信息承载于RRC重配置消息、MAC CE、DCI中的任一种。
302、终端设备检测目标小区的同步信号以完成下行同步。
目标小区的同步信号可以是SSB，也可以是其他信号，本申请不做限定。终端设备接收到第一指示消息之后，执行步骤302。可理解，终端设备接收到第一指示消息之后，根据该第一指示信息获知需要进行同步相关操作，因此执行步骤302。
步骤302一种可能的实现方式如下：终端设备搜索并接收目标小区发送的同步信号以完成下行同步。举例来说，目标小区周期性发送SSB，UE搜索并接收SSB以获得下行同步。
303、终端设备根据第二指示信息，向目标小区发送第一上行信号。
上述第一上行信号用于确定上述终端设备在上述目标小区的TA。第一上行信号为可用于计算TA的已知上行信号(例如preamble，SRS等)。向目标小区发送第一上行信号可以是向目标小区对应的第二接入网设备发送第一上行信号。第二接入网设备为目标小区对应的实体。
步骤303一种可能的实现方式如下：终端设备根据第二指示信息，利用终端设备向目标 小区发送上行信号可用的时频资源，向目标小区发送第一上行信号。
304、终端设备接收来自第一接入网设备的第一消息。
步骤304可参阅步骤201。
305、终端设备向第一接入网设备发送第二消息。
步骤305可参阅步骤202。
本申请实施例中，终端设备接收来自第一接入网设备的第一消息之前，检测目标小区的同步信号以完成下行同步以及向目标小区发送第一上行信号，能够在执行小区切换之前，完成上下行同步，从而减少小区切换的时延。
本申请实施例中，终端设备接收来自第一接入网设备的第一消息之前，检测目标小区的同步信号以完成下行同步，能够在执行小区切换之前，完成下行同步，从而减少小区切换的时延。
本申请提供的可减少小区切换的时延的方案需要终端设备、终端设备当前接入的小区对应的实体(第一接入网设备)以及目标小区对应的实体(第二接入网设备)配合实现。图2至图4描述了终端设备执行的提前同步的方法流程。下面介绍终端设备当前接入的小区对应的第一接入网设备执行的提前同步的方法流程。
图4为本申请实施例提供的另一种提前同步的方法流程。如图4所示，该方法流程包括：
401、第一接入网设备向终端设备发送第一消息。
上述第一消息用于终端设备获得该终端设备在目标小区的TA。在一种可能的实现方式中，第一消息包含终端设备在目标小区的TA和该目标小区的标识。第一消息还可包含上述目标小区的配置信息。在一种可能的实现方式中，上述第一消息为无线资源控制RRC重配置消息。步骤401可参阅步骤201。
402、第一接入网设备接收来自终端设备的第二消息。
上述第二消息指示上述终端设备已完成上述目标小区的配置。步骤402可参阅步骤202。
本申请实施例中，第一消息用于终端设备获得其在目标小区的TA。第一接入网设备向终端设备发送第一消息，可以使得该终端设备在接入目标小区之前，获得该终端设备在该目标小区的TA，因此可以提前完成上行同步，从而降低小区切换的时延。
图5为本申请实施例提供的另一种提前同步的方法流程图。图5中的方法流程为图4中描述的方法的一种可能的实现方式。如图5所示，该方法流程包括：
501、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
上述第一指示信息指示上述终端设备进行同步相关操作，上述第二指示信息指示上述终端设备向上述目标小区发送上行信号可用的时频资源。第一接入网设备为终端设备当前接入的小区对应的实体。步骤501可参阅步骤301。
502、第一接入网设备接收来自终端设备的第一上行信号。
上述第一上行信号用于获取上述终端设备在上述目标小区的TA。第一接入网设备为终端设备当前接入的小区对应的实体，并且为终端设备待接入的目标小区对应的实体。应理解，终端设备当前接入的小区和目标小区对应同一实体(即共站)。
503、第一接入网设备根据第一上行信号，确定终端设备在目标小区的TA。
步骤502和步骤503描述的是第一接入网设备为终端设备当前接入的小区对应的实体，并且为终端设备待接入的目标小区对应的实体时，第一接入网设备获取终端设备在目标小区的TA的方式。
当第一接入网设备不为终端设备待接入的目标小区对应的实体时，步骤502至步骤503 可替换为：第一接入网设备接收来自第二接入网设备的第三消息，第三消息包含上述终端设备在上述目标小区的TA；第一接入网设备根据第三消息，获取终端设备在上述目标小区的TA。第二接入网设备属于上述目标小区对应的实体，上述第一接入网设备和上述第二接入网设备属于不同的实体。也就是说，终端设备当前接入的小区与目标小区不共站时，目标小区所在站(即第二接入网设备)向终端设备当前接入的小区所在站(第一接入网设备)发送第三消息(可称为协助切换消息)，该消息包括UE在目标小区的TA。
504、第一接入网设备向终端设备发送第一消息。
步骤504可参阅步骤401。
505、第一接入网设备接收来自终端设备的第二消息。
步骤505可参阅步骤402。
本申请实施例中，第一接入网设备向终端设备发送第一指示信息和第二指示信息，以便指示该终端设备在配置目标小区之前，及时进行同步相关操作。在第一接入网设备向终端设备发送第一消息之前，第一接入网设备接收来自终端设备的第一上行信号或者接收来自第二接入网设备的第三消息，以便获取终端设备在目标小区的TA。这样第一接入网设备就可在第一消息中携带用于获取终端设备在目标小区的TA的信息，以便该终端设备在获得目标小区的配置信息时，就能获得终端设备在目标小区的TA的信息。
图6为本申请实施例提供的另一种提前同步的方法流程图。图6中的方法流程是目标小区对应的第二接入网设备实现的。如图6所示，该方法流程包括：
601、第二接入网设备接收来自终端设备的第一上行信号。
步骤601一种可能的实现方式如下：第二接入网设备在完成目标小区的覆盖之前，接收来自终端设备的第一上行信号。第二接入网设备完成目标小区的覆盖可以是该第二接入网设备将该目标小区从休眠状态调整为正常工作状态，也可以是将目标小区从正常工作状态调整为覆盖扩展状态。可理解，第二接入网设备在完成目标小区的覆盖之后，该目标小区处于正常工作状态或覆盖扩展状态。
602、第二接入网设备根据第一上行信号，确定终端设备在目标小区的TA。
603、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于上述第一接入网设备获得终端设备在目标小区的TA。在一种可能的实现方式中，第三消息包含终端设备在目标小区的TA和目标小区的配置信息。
步骤603是可选的。应理解，当第二接入网设备属于终端设备待接入的目标小区对应的实体，并且不属于该终端设备当前接入的小区对应的实体时，第二接入网设备在执行步骤602之后，可执行步骤603，以便第一接入网设备获得终端设备在目标小区的TA。也就是说，当终端设备当前接入的小区所在的站(第一接入网设备)和待接入的目标小区所在的站(第二接入网设备)不共站时，第二接入网设备在执行步骤602之后，需要执行步骤603。
当第二接入网设备属于终端设备待接入的目标小区对应的实体，并且属于该终端设备当前接入的小区对应的实体时，第二接入网设备在执行步骤602之后，不必执行步骤603。由于第二接入网设备和第一接入网设备属于同一实体(即共站)，因此该第二接入网设备不必向该第一接入网设备发送第三消息。
步骤603一种可能的实现方式如下：第二接入网设备在完成目标小区的覆盖之前，向第一接入网设备发送第三消息。在该实现方式中，可以使得第一接入网设备在第二接入网设备在完成目标小区的覆盖之前，得到终端设备在目标小区的TA，进而提前实现上行同步。
本申请实施例中，第二接入网设备向第一接入网设备发送第三消息，使得该第一接入网 设备获得终端设备在目标小区的TA，以便提前实现上行同步。
图7为本申请实施例提供的另一种提前同步的方法流程图。图7中的方法流程是目标小区对应的第二接入网设备实现的。如图7所示，该方法流程包括：
701、第二接入网设备在完成目标小区的覆盖之前，完成对目标小区的同步波束的覆盖。
第二接入网设备为终端设备待接入的目标小区对应的实体。第二接入网设备完成目标小区的覆盖可以是该第二接入网设备将该目标小区从休眠状态调整为正常工作状态，也可以是将目标小区从正常工作状态调整为覆盖扩展状态。第二接入网设备完成目标小区的覆盖(例如进入覆盖扩展状态)需要完成同步波束(例如SSB)的覆盖，以及其他操作。
在一种可能的实现方式中，第二接入网设备可先对目标小区的同步波束的覆盖进行扩展(展宽)，以便在完成目标小区的覆盖之前，完成对目标小区的同步波束的覆盖。也就是说，第二接入网设备在目标小区进入覆盖扩展状态之前，先完成对目标小区的同步波束的覆盖，这样就可以提前执行上下行同步操作，即进行同步相关操作。
在一种可能的实现方式中，第二接入网设备可先实现目标小区的同步波束的覆盖，以便在完成目标小区的覆盖之前，完成对目标小区的同步波束的覆盖。也就是说，第二接入网设备在目标小区进入工作状态之前，先完成对目标小区的同步波束的覆盖，这样就可以提前执行上下行同步操作，即进行同步相关操作。
702、第二接入网设备在完成目标小区的覆盖之前，接收来自终端设备的第一上行信号。
上述第一上行信号用于获取上述终端设备在上述目标小区的TA。
703、第二接入网设备根据第一上行信号，确定终端设备在目标小区的TA。
704、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于上述第一接入网设备获得终端设备在目标小区的TA。在一种可能的实现方式中，第三消息包含终端设备在目标小区的TA和目标小区的配置信息。
步骤704是可选的。应理解，当第二接入网设备属于终端设备待接入的目标小区对应的实体，并且不属于该终端设备当前接入的小区对应的实体时，第二接入网设备在执行步骤703之后，可执行步骤704，以便第一接入网设备获得终端设备在目标小区的TA。也就是说，当终端设备当前接入的小区所在的站(第一接入网设备)和待接入的目标小区所在的站(第二接入网设备)不共站时，第二接入网设备在执行步骤703之后，需要执行步骤704。
当第二接入网设备属于终端设备待接入的目标小区对应的实体，并且属于该终端设备当前接入的小区对应的实体时，第二接入网设备在执行步骤703之后，不必执行步骤704。由于第二接入网设备和第一接入网设备属于同一实体(即共站)，因此该第二接入网设备不必向该第一接入网设备发送第三消息。当第二接入网设备属于终端设备待接入的目标小区对应的实体，并且属于该终端设备当前接入的小区对应的实体时，第二接入网设备在执行步骤703之后，第二接入网设备可向终端设备发送第一消息。上述第一消息用于上述终端设备获得上述终端设备在目标小区的TA。
本申请实施例中，第二接入网设备在完成目标小区的覆盖之前，接收来自终端设备的第一上行信号；能够提前完成在目标小区的上行同步，从而减少小区切换的时延。提前完成在目标小区的上行同步可理解为在目标小区进入覆盖扩展状态之前，执行终端设备实现上行同步的一部分或全部操作。
下面结合小区休眠时的小区切换场景，介绍本申请实施例提供的提前同步的方法在小区切换中的应用。图8为本申请实施例提供的一种小区切换的方法流程图。图1A为图8的方法流程适用的一个小区切换场景的示例。图8的方法流程适用的一个小区切换场景的示例如 下：小区1和小区2都处于正常运行模式(即正常工作状态)，UE已接入小区1，小区1即将进行休眠，小区2进行展宽。因此UE需执行小区切换，由小区1切换至小区2(展宽后的小区2)。本申请实施例中，小区1对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为小区1执行的操作；小区2对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为小区2执行的操作。小区2可视为上述目标小区的示例。如图8所示，该方法流程可包括：
801、第二接入网设备对小区2的同步波束覆盖进行展宽。
第二接入网设备对小区2的同步波束覆盖进行展宽可理解为：第二接入网设备在完成小区2的覆盖之前，在小区2对应的扩展后的覆盖内周期性发送同步波束。或者说，第二接入网设备在小区2进入覆盖扩展状态之前，先对小区2的同步波束覆盖进行展宽，以便终端设备进行下行同步。对小区2的同步波束覆盖进行展宽可视为对小区2预先进行同步波束覆盖展宽。
802、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤802可参阅步骤501。
803、终端设备检测小区2的同步信号以完成下行同步。
步骤803可参阅步骤302。
804、终端设备根据第二指示信息，向小区2发送第一上行信号。
步骤804可参阅步骤303。
805、第二接入网设备根据第一上行信号，计算终端设备在小区2的TA。
806、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于第一接入网设备获得终端设备在小区2的TA。
步骤806是可选的。当第二接入网设备和第一接入网设备为不同的实体，即小区2和小区1不共站时，第二接入网设备在执行步骤805之后，执行步骤806，以便第一接入网设备根据第三消息获得终端设备在小区2的TA。
当第二接入网设备和第一接入网设备为同一个实体，即小区2和小区1共站时，第二接入网设备计算终端设备在小区2的TA也就是第一接入网设备计算终端设备在小区2的TA，因此不必执行步骤806。
807、第二接入网设备完成小区2的覆盖。
第二接入网设备完成小区2的覆盖可理解为小区2已从正常工作状态成功进入覆盖扩展状态。在一种可能的实现方式中，第二接入网设备可优先对小区2进行同步波束的覆盖，以便尽快完成对小区2的同步波束的覆盖。由于第二接入网设备对小区2进行同步波束的覆盖可视为完成小区2的覆盖的一部分，因此第二接入网设备开始执行步骤801的时刻为开始实现小区2的覆盖的时刻。步骤802完成的时刻可视为完成小区2的覆盖的时刻。图1A中右边的小区2为完成覆盖后的小区2(覆盖扩展状态)，左边的小区2为原来的小区2(正常工作状态)。在一种可能的实现方式中，第二接入网设备在完成小区2的同步波束的覆盖之后，开始执行完成小区2的覆盖需要执行的相关操作。在一种可能的实现方式中，第二接入网设备在实现小区2的同步波束的覆盖的过程中，并行执行完成小区2的覆盖需要执行的相关操作。
808、第一接入网设备向终端设备发送第一消息以发起小区切换。
第一消息可包含小区2的配置信息和UE在小区2的TA值等。第一消息可以为RRCReconfiguration消息。
809、终端设备完成小区2的配置，并向小区1发送第二消息。
第二消息可以是用于回复第一消息(RRCReconfiguration消息)的RRCReconfigurationComplete。在一种可能的实现方式中，终端设备完成小区2的配置可以是终端设备根据第一消息中的小区2的配置信息，完成小区2的配置。终端设备完成小区2的配置可视为终端设备完成从小区1至小区2的切换。
810、第一接入网设备控制小区1休眠。
本申请实施例中，终端设备接收的第一消息中包含小区2的配置信息和UE在小区2的TA值；该终端设备在切换至小区2之前，就可实现上行同步。另外，终端设备在小区2完成覆盖之前，检测小区2的同步信号以完成下行同步；可以在切换至小区2之前，实现下行同步。可见，小区切换过程中采用本申请实施例提供的提前同步的方法，降低了小区的小区切换时延，减少了旧小区(即小区1)和目标小区(小区2)覆盖重叠的时间，提升用户体验；加快了小区1进入休眠的速度，使节能效果提升。
下面结合小区恢复时的小区切换场景，介绍本申请实施例提供的提前同步的方法在小区切换中的应用。图9为本申请实施例提供的另一种小区切换的方法流程图。图1A为图9的方法流程适用的一个小区切换场景的示例。图9的方法流程适用的一个小区切换场景的示例如下：小区2处于覆盖扩展状态(可视为扩展的小区2)，小区1处于休眠状态，UE已接入小区2，小区2即将复原(取消扩展)，小区1即将恢复运行。小区2即将复原可理解为小区2即将从覆盖扩展状态调整为正常工作状态。小区1即将恢复运行可理解为小区1即将从休眠状态调整为正常工作状态。因此UE需执行小区切换，由小区2切换至小区1(恢复运行的小区1)。本申请实施例中，小区2对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为小区2执行的操作；小区1对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为小区1执行的操作。小区1可视为上述目标小区的示例。如图9所示，该方法流程可包括：
901、第二接入网设备对小区1进行同步波束的覆盖。
第二接入网设备对小区2进行同步波束的覆盖可理解为：第二接入网设备在小区1的覆盖内周期性发送同步波束。或者说，第二接入网设备在小区1进入正常工作状态之前，先周期性发送同步波束，以便终端设备进行下行同步。
902、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤902可参阅步骤501。第一指示信息指示上述终端设备进行同步相关操作。
903、终端设备检测小区1的同步信号以完成下行同步。
步骤903可参阅步骤302。
904、终端设备根据第二指示信息，向小区1发送第一上行信号。
步骤904可参阅步骤303。
905、第二接入网设备根据第一上行信号，计算终端设备在小区1的TA。
906、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于第一接入网设备获得终端设备在小区1的TA。
步骤906是可选的。当第二接入网设备和第一接入网设备为不同的实体，即小区2和小区1不共站时，第二接入网设备在执行步骤905之后，执行步骤906，以便第一接入网设备根据第三消息获得终端设备在小区1的TA。
当第二接入网设备和第一接入网设备为同一个实体，即小区2和小区1共站时，第二接入网设备计算终端设备在小区1的TA也就是第一接入网设备计算终端设备在小区1的TA， 因此不必执行步骤906。
907、第二接入网设备完全恢复小区1的运行。
第二接入网设备完全恢复小区1的运行可理解为小区1已从休眠工作状态成功进入正常工作状态。
908、第一接入网设备向终端设备发送第一消息以发起小区切换。
第一消息可包含小区1的配置信息和UE在小区1的TA值等。第一消息可以为RRCReconfiguration消息。
909、终端设备完成小区1的配置，并向小区2发送第二消息。
第二消息可以是用于回复第一消息(RRCReconfiguration消息)的RRCReconfigurationComplete。在一种可能的实现方式中，终端设备完成小区1的配置可以是终端设备根据第一消息中的小区1的配置信息，完成小区1的配置。终端设备完成小区1的配置可视为终端设备完成从小区2至小区1的切换。
910、第一接入网设备取消小区2的扩展。
第一接入网设备取消小区2的扩展可以是第一接入网设备将小区2从覆盖扩展状态调整为正常工作状态。
本申请实施例中，终端设备接收的第一消息中包含小区1的配置信息和UE在小区1的TA值；该终端设备在切换至小区1之前，就可实现上行同步。另外，终端设备在小区1完全恢复运行之前，检测小区1的同步信号以完成下行同步；可以在切换至小区1之前，实现下行同步。可见，小区切换过程中采用本申请实施例提供的提前同步的方法，降低了小区的小区切换时延，减少了原小区(即小区2)和目标小区(小区1)覆盖重叠的时间，提升用户体验；加快了小区1从休眠中恢复的速度，减轻了小区休眠对用户体验的影响。结合图8和图9的方法流程可知，本申请实施例提供的提前同步的方法可以使得小区休眠及恢复操作的时间粒度更细，增加小区休眠的机会，增强节能效果。
下面结合辅载波小区休眠时的辅载波小区切换场景，介绍本申请实施例提供的提前同步的方法在小区切换中的应用。图10为本申请实施例提供的一种辅载波小区切换的方法流程图。图1B为图10的方法流程适用的一个辅载波小区切换场景的示例。图10的方法流程适用的一个辅载波小区切换场景的示例如下：主载波小区1、主载波小区2和辅载波小区1、辅载波小区2都处于正常运行模式(即正常工作状态)，UE已接入主载波小区1和辅载波小区1，辅载波小区1即将进行休眠，辅载波小区2进行展宽。因此UE需执行小区切换，由辅载波小区1切换至辅载波小区2(展宽后的辅载波小区2)。本申请实施例中，主载波小区1对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为主载波小区执行的操作；辅载波小区2对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为辅载波小区2执行的操作；辅载波小区1对应的实体为第三接入网设备，第三接入网设备执行的操作可理解为辅载波小区1执行的操作。辅载波小区2可视为上述目标小区的示例。如图10所示，该方法流程可包括：
1001、第二接入网设备对辅载波小区2的同步波束覆盖进行展宽。
第二接入网设备对辅载波小区2的同步波束覆盖进行展宽可理解为：第二接入网设备在完成辅载波小区2的覆盖之前，在辅载波小区2对应的扩展后的覆盖内周期性发送同步波束。或者说，第二接入网设备在辅载波小区2进入覆盖扩展状态之前，先对辅载波小区2的同步波束覆盖进行展宽，以便终端设备进行下行同步。对辅载波小区2的同步波束覆盖进行展宽可视为对辅载波小区2预先进行同步波束覆盖展宽。
1002、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤1002可参阅步骤501。第一指示信息指示上述终端设备进行同步相关操作。
1003、终端设备检测辅载波小区2的同步信号以完成下行同步。
步骤1003可参阅步骤302。
1004、终端设备根据第二指示信息，向辅载波小区2发送第一上行信号。
步骤1004可参阅步骤303。
1005、第二接入网设备根据第一上行信号，计算终端设备在辅载波小区2的TA。
1006、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于第一接入网设备获得终端设备在辅载波小区2的TA。
步骤1006是可选的。当第二接入网设备和第一接入网设备为不同的实体，即辅载波小区2和主载波小区1不共站时，第二接入网设备在执行步骤1005之后，执行步骤1006，以便第一接入网设备根据第三消息获得终端设备在辅载波小区2的TA。
当第二接入网设备和第一接入网设备为同一个实体，即辅载波小区2和主载波小区1共站时，第二接入网设备计算终端设备在辅载波小区2的TA也就是第一接入网设备计算终端设备在辅载波小区2的TA，因此不必执行步骤1006。
1007、第二接入网设备完成对辅载波小区2的覆盖展宽。
第二接入网设备完成对辅载波小区2的覆盖展宽可理解为辅载波小区2已从正常工作状态成功进入覆盖扩展状态。
1008、第一接入网设备向终端设备发送第一消息以发起小区切换。
第一消息可包含辅载波小区2的配置信息和UE在辅载波小区2的TA值等。第一消息可以为RRCReconfiguration消息。
1009、终端设备完成辅载波小区2的配置，并向主载波小区1发送第二消息。
第二消息可以是用于回复第一消息(RRCReconfiguration消息)的RRCReconfigurationComplete。在一种可能的实现方式中，终端设备完成辅载波小区2的配置可以是终端设备根据第一消息中的辅载波小区2的配置信息，完成辅载波小区2的配置。终端设备完成辅载波小区2的配置可视为终端设备完成从辅载波小区1至辅载波小区2的切换。
1010、第三接入网设备控制辅载波小区1休眠。
本申请实施例中，终端设备接收的第一消息中包含辅载波小区2的配置信息和UE在辅载波小区2的TA值；该终端设备在切换至辅载波小区2之前，就可实现上行同步。另外，终端设备在辅载波小区2完成展宽覆盖之前，检测辅载波小区2的同步信号以完成下行同步；可以在切换至辅载波小区2之前，实现下行同步。可见，小区切换过程中采用本申请实施例提供的提前同步的方法，降低了辅载波小区的小区切换时延，减少了原辅载波小区(即辅载波小区1)和目标辅载波小区(辅载波小区2)覆盖重叠的时间，提升用户体验；加快了辅载波小区1进入休眠的速度，使节能效果提升。
下面结合辅载波小区恢复时的辅载波小区切换场景，介绍本申请实施例提供的提前同步的方法在小区切换中的应用。图11为本申请实施例提供的一种辅载波小区切换的方法流程图。图1B为图11的方法流程适用的一个辅载波小区切换场景的示例。图11的方法流程适用的一个辅载波小区切换场景的示例如下：主载波小区1和主载波小区2处于正常运行模式(即正常工作状态)，辅载波小区1处于休眠状态，辅载波小区2处于覆盖扩展状态，UE已接入主载波小区1和辅载波小区2，辅载波小区2即将复原(取消扩展)，辅载波小区1即将恢复运行。辅载波小区2即将复原可理解为辅载波小区2即将从覆盖扩展状态调整为正常工作状态。 辅载波小区1即将恢复运行可理解为辅载波小区1即将从休眠状态调整为正常工作状态。因此UE需执行小区切换，由辅载波小区2切换至辅载波小区1(恢复运行的辅载波小区1)。本申请实施例中，主载波小区1对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为主载波小区执行的操作；辅载波小区1对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为辅载波小区1执行的操作；辅载波小区2对应的实体为第三接入网设备，第三接入网设备执行的操作可理解为辅载波小区2执行的操作。辅载波小区1可视为上述目标小区的示例。如图11所示，该方法流程可包括：
1101、第二接入网设备对辅载波小区1进行同步波束的覆盖。
第二接入网设备对辅载波小区1进行同步波束的覆盖可理解为：第二接入网设备在辅载波小区1的覆盖内周期性发送同步波束。或者说，第二接入网设备在辅载波小区1进入正常工作状态之前，先周期性发送同步波束，以便终端设备进行下行同步。
1102、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤1102可参阅步骤501。第一指示信息指示上述终端设备进行同步相关操作。
1103、终端设备检测辅载波小区1的同步信号以完成下行同步。
步骤1103可参阅步骤302。
1104、终端设备根据第二指示信息，向辅载波小区1发送第一上行信号。
步骤1104可参阅步骤303。
1105、第二接入网设备根据第一上行信号，计算终端设备在辅载波小区1的TA。
1106、第二接入网设备向第一接入网设备发送第三消息。
第三消息用于第一接入网设备获得终端设备在辅载波小区1的TA。
步骤1106是可选的。当第二接入网设备和第一接入网设备为不同的实体，即辅载波小区1和主载波小区1不共站时，第二接入网设备在执行步骤1105之后，执行步骤1106，以便第一接入网设备根据第三消息获得终端设备在辅载波小区1的TA。
当第二接入网设备和第一接入网设备为同一个实体，即辅载波小区1和主载波小区1共站时，第二接入网设备计算终端设备在辅载波小区1的TA也就是第一接入网设备计算终端设备在辅载波小区1的TA，因此不必执行步骤1106。
1107、第二接入网设备完全恢复辅载波小区1的运行。
第二接入网设备完全恢复辅载波小区1的运行可理解为辅载波小区1已从休眠工作状态成功进入正常工作状态。
1108、第一接入网设备向终端设备发送第一消息以发起小区切换。
第一消息可包含辅载波小区1的配置信息和UE在辅载波小区1的TA值等。第一消息可以为RRCReconfiguration消息。
1109、终端设备完成辅载波小区1的配置，并向主载波小区1发送第二消息。
第二消息可以是用于回复第一消息(RRCReconfiguration消息)的RRCReconfigurationComplete。在一种可能的实现方式中，终端设备完成辅载波小区1的配置可以是终端设备根据第一消息中的辅载波小区1的配置信息，完成辅载波小区1的配置。终端设备完成辅载波小区1的配置可视为终端设备完成从辅载波小区2至辅载波小区1的切换。
1110、第三接入网设备取消辅载波小区2的扩展。
第三接入网设备取消辅载波小区2的扩展可以是第三接入网设备将辅载波小区2从覆盖扩展状态调整为正常工作状态。
本申请实施例中，终端设备接收的第一消息中包含辅载波小区1的配置信息和UE在辅 载波小区1的TA值；该终端设备在切换至辅载波小区1之前，就可实现上行同步。另外，终端设备在辅载波小区1完全恢复运行之前，检测辅载波小区1的同步信号以完成预下行同步；可以在切换至辅载波小区1之前，实现下行同步。可见，小区切换过程中采用本申请实施例提供的提前同步的方法，降低了辅载波小区的小区切换时延，减少了原辅载波小区(即辅载波小区1)和目标辅载波小区(辅载波小区2)覆盖重叠的时间，提升用户体验；加快了辅载波小区1进入休眠的速度，使节能效果提升。结合图8和图9的方法流程可知，本申请实施例提供的提前同步的方法可以使得辅载波小区休眠及恢复操作的时间粒度更细，增加辅载波小区休眠的机会，增强节能效果。
图12示出了一种通信装置1200的结构示意图。该通信装置1200可以对应实现上述各个方法实施例中由接入网设备(例如第一接入网设备或第二接入网设备)实现的功能或者步骤，也可实现上述各个方法实施例中由终端设备实现的功能或者步骤。该通信装置可以包括处理模块1210和收发模块1220。可选的，还可以包括存储单元，该存储单元可以用于存储指令(代码或者程序)和/或数据。处理模块1210和收发模块1220可以与该存储单元耦合，例如，处理模块1210可以读取存储单元中的指令(代码或者程序)和/或数据，以实现相应的方法。上述各个单元可以独立设置，也可以部分或者全部集成。例如收发模块1220可包括发送模块和接收模块。
在一些可能的实施方式中，通信装置1200能够对应实现上述方法实施例中第一接入网设备的操作和功能。例如通信装置1200可以为第一接入网设备，也可以为应用于第一接入网设备中的部件(例如芯片或者电路)。收发模块1220例如可以用于执行图5、图6、图8、图9的实施例中由第一接入网设备所执行的全部接收或发送操作，例如图4所示的实施例中的步骤401和步骤402以及图5所示实施例中的步骤501、步骤502、步骤504、步骤505，和/或用于支持本文所描述的技术的其它过程。处理模块1210用于执行图5、图6、图8、图9的实施例中中由第一接入网设备所执行的除了收发操作之外的全部操作，例如图5所示的实施例中的步骤503。
在一些可能的实施方式中，通信装置1200能够对应实现上述方法实施例中第二接入网设备的操作和功能。例如通信装置1200可以为第二接入网设备，也可以为应用于第二接入网设备中的部件(例如芯片或者电路)。收发模块1220例如可以用于执行图7、图8、图9、图10、图11的实施例中由第二接入网设备所执行的全部接收或发送操作，例如图6所示的实施例中的步骤601、步骤603以及图7所示实施例中的步骤702、步骤704，和/或用于支持本文所描述的技术的其它过程。处理模块1210用于执行图7、图8、图9、图10、图11的实施例中中由第二接入网设备所执行的除了收发操作之外的全部操作，例如图6所示的实施例中的步骤602，以及图7所示的实施例中的步骤701和步骤703。
在一些可能的实施方式中，通信装置1200能够对应实现上述方法实施例中终端设备的操作和功能。例如通信装置1200可以为终端设备，也可以为应用于终端设备中的部件(例如芯片或者电路)。收发模块1220例如可以用于执行图2、图3、图4、图8、图9的实施例中由终端设备所执行的全部接收或发送操作，例如图2所示的实施例中的步骤201、步骤202以及图3所示实施例中的步骤301、步骤303、步骤304、步骤305，和/或用于支持本文所描述的技术的其它过程。处理模块1210用于执行图2、图3、图4、图8、图9的实施例中中由终端设备所执行的除了收发操作之外的全部操作，例如图3所示的实施例中的步骤302，以及图4所示的实施例中的步骤402。
图13为本申请实施例提供的另一种通信装置130的结构示意图。图13中的通信装置可 以是上述终端设备。图13中的通信装置可以是上述第一接入网设备。图13中的通信装置可以是上述第二接入网设备。
如图13所示，该通信装置130包括至少一个处理器1320和收发器1310。
在本申请的另一些实施例中，处理器1320和收发器1310可以用于执行上述第一接入网设备执行的功能或操作等。处理器1320例如可执行如下一项多项操作：图5中的步骤503。收发器1310例如可执行如下一项或多项操作：图4中的步骤401、步骤402，图5中的步骤501、步骤502、步骤504、步骤505，图8中的步骤802、步骤808，图9中的步骤902、步骤908。
在本申请的一些实施例中，处理器1320和收发器1310可以用于执行上述第二接入网设备执行的功能或操作等。处理器1320例如可执行如下一项多项操作：图6中的步骤602，图7中的步骤701、步骤703，图8中的步骤801、步骤805、步骤807。收发器1310例如可执行如下一项或多项操作：图6中的步骤601、步骤603，图7中的步骤702、步骤704，图8中的步骤806，图9中的步骤906。
在本申请的一些实施例中，处理器1320和收发器1310可以用于执行上述终端设备执行的功能或操作等。处理器1320例如可执行如下一项或多项操作：图3中的步骤302、图4中的步骤402，图8中的步骤803、步骤809，图9中的步骤903、步骤909。收发器1310可执行如下一项或多项操作：图2中的步骤201、步骤202，图3中的步骤301、步骤303、步骤304、步骤305，图4中的步骤401、步骤403、步骤404，图8中的步骤804、步骤809，图9中的步骤904、步骤909。
收发器1310用于通过传输介质和其他设备/装置进行通信。处理器1320利用收发器1310收发数据和/或信令，并用于实现上述方法实施例中的方法。处理器1320可实现处理模块1210的功能，收发器1310可实现收发模块1220的功能。
可选的，通信装置130还可以包括至少一个存储器1330，用于存储程序指令和/或数据。存储器1330和处理器1320耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1320可能和存储器1330协同操作。处理器1320可能执行存储器1330中存储的程序指令。该至少一个存储器中的至少一个可以包括于处理器中。
本申请实施例中不限定上述收发器1310、处理器1320以及存储器1330之间的具体连接介质。本申请实施例在图13中以存储器1330、处理器1320以及收发器1310之间通过总线1340连接，总线在图13中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。该总线可以分为地址总线、数据总线、控制总线等。为便于表示，图13中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
图14为本申请实施例提供的另一种通信装置140的结构示意图。如图14所示，图14所示的通信装置包括逻辑电路1401和接口1402。图12中的处理模块1210可以用逻辑电路1401实现，图12中的收发模块1220可以用接口1402实现。其中，该逻辑电路1401可以为芯片、处理电路、集成电路或片上系统(system on chip，SoC)芯片等，接口1402可以为通信接口、 输入输出接口等。本申请实施例中，逻辑电路和接口还可以相互耦合。对于逻辑电路和接口的具体连接方式，本申请实施例不作限定。
在本申请的一些实施例中，该逻辑电路和接口可用于执行上述第一接入网设备执行的功能或操作等。
在本申请的另一些实施例中，该逻辑电路和接口可用于执行上述第二接入网设备执行的功能或操作等。
在本申请的另一些实施例中，该逻辑电路和接口可用于执行上述第三接入网设备执行的功能或操作等。
在本申请的另一些实施例中，该逻辑电路和接口可用于执行上述终端设备执行的功能或操作等。
在本申请的一些实施例中，该逻辑电路和接口可用于执行上述终端设备执行的功能或操作等。
本申请还提供一种计算机可读存储介质，该计算机可读存储介质中存储有计算机代码，当计算机代码在计算机上运行时，使得计算机执行上述实施例的方法。
本申请还提供一种计算机程序产品，该计算机程序产品包括计算机代码或计算机程序，当该计算机代码或计算机程序在计算机上运行时，使得上述实施例中的提前同步的方法被执行。
本申请还提供一种通信系统，包括终端设备、第一接入网设备、第二接入网设备。
本申请还提供一种通信系统，包括终端设备、第一接入网设备、第二接入网设备以及第三接入网设备。
图15为本申请实施例提供的另一种提前同步的方法流程图。如图15所示，该方法包括：
1501、第一接入网设备向终端设备发送第一消息。
相应的，终端设备接收来自第一接入网设备的第一消息。第一消息包括第三指示信息、第四指示信息以及用于终端设备接入目标小区的配置信息。上述第三指示信息用于指示终端设备向目标小区切换的条件。该条件可视为终端设备从当前接入的小区向目标小区切换的条件。该条件可以是满足一种测量事件或接收到一条信令等。目标小区不属于终端设备当前接入的小区。第一接入网设备为终端设备当前接入的小区提供服务的接入网设备。上述第四指示信息用于指示终端设备在目标小区的TA。
在一种可能的实现方式中，上述条件包括以下一项或多项：上述终端设备测量的其当前接入的小区的信号质量低于第一阈值；上述终端设备测量的上述目标小区的信号质量高于或等于第二阈值。上述第一阈值和第二阈值可根据实际需求进行配置，这里不作限定。终端设备根据上述条件可合理的判断是否需要从当前接入的小区向目标小区切换。
在一种可能的实现方式中，第一接入网设备向终端设备发送第一消息之前，向终端设备发送第一指示信息和第二指示信息，第一指示信息指示终端设备进行同步相关操作，第二指示信息指示终端设备向目标小区发送上行信号可用的时频资源。终端设备可根据第一指示信息，检测目标小区的同步信号以完成下行同步。终端设备可根据上述第二指示信息，向目标小区发送第一上行信号，上述第一上行信号用于确定上述终端设备在目标小区的TA。在该实现方式中，检测目标小区的同步信号以完成下行同步，能够在向目标小区切换之前，完成与该目标小区的下行同步。向目标小区发送第一上行信号，以便在向目标小区切换之前，获得终端设备在目标小区的TA。
1502、终端设备向第一接入网设备回复第二消息。
第二消息用于指示终端设备已经收到上述第一消息。或者说，第二消息所述终端设备已完成所述目标小区的配置，例如配置终端设备在目标小区的TA、配置的用于判断是否进行目标小区切换的条件的评估。
1503、终端设备评估是否满足向目标小区切换的条件。
例如，上述条件是满足一种测量事件；终端设备接收上述第一消息之后，可按预先约定的测量事件进行测量。又例如，上述条件是接收到一条信令；终端设备接收上述第一消息之后，可尝试/准备接受对应信令等。
若满足终端设备向目标小区切换的条件，终端设备根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换。
目标小区的配置信息是指用于终端设备接入目标小区的配置信息。在一种可能的实现方式中，终端设备完成目标小区的配置之后，向目标小区回复RRCReconfigurationComplete消息，该RRCReconfigurationComplete消息指示终端设备已完成小区切换。
在一种可能的实现方式中，满足终端设备向目标小区切换的条件的情况包括接收到用于指示满足上述条件的信息。例如，终端设备接收到来自第一接入网设备的用于指示满足上述条件的信息。
本申请实施例中，终端设备进行小区切换之前，接收第一接入网设备的第一消息。终端在切换前可提前获得目标小区的配置以及上下行同步，且配置了向目标小区切换的条件，终端设备需要切换时，无需网络向终端发送切换信令触发，且可根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换，不需要花费时间来获取终端设备在目标小区的TA；能够进一步降低小区切换的时延。
图16为本申请实施例提供的一种小区切换的方法流程图。图1A为图16的方法流程适用的一个小区切换场景的示例。图16的方法流程适用的一个小区切换场景的示例如下：小区1和小区2都处于正常运行模式(即正常工作状态)，终端设备已接入小区1，小区1即将进行休眠，小区2将进行展宽。因此终端设备需执行小区切换，由小区1切换至小区2(展宽后的小区2)。本申请实施例中，小区1对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为小区1执行的操作；小区2对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为小区2执行的操作。小区2可视为上述目标小区的示例。如图16所示，该方法流程可包括：
1601、第二接入网设备对小区2的同步波束覆盖进行展宽。
步骤1602可参阅步骤801。
1602、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤1602可参阅步骤501。在一种可能的实现方式中，第一接入网设备在小区2(即目标小区)完成同步波束覆盖的展宽之后，向终端设备发送第一指示信息；以便终端设备更快完成与小区2的下行同步。
1603、终端设备检测小区2的同步信号以完成下行同步。
步骤1603可参阅步骤302。终端设备根据第一指示信息，检测小区2的同步信号以完成下行同步。
1604、终端设备根据第二指示信息，向小区2发送第一上行信号。
步骤1604可参阅步骤303。
1605、第二接入网设备根据第一上行信号，计算终端设备在小区2的TA。
1606、第二接入网设备向第一接入网设备发送第三消息。
第三消息可包括终端设备在小区2的TA和用于终端设备接入小区1的配置信息。
步骤1606是可选的。当第二接入网设备和第一接入网设备为不同的实体，即小区2和小区1不共站时，第二接入网设备在执行步骤1605之后，执行步骤1606，以便第一接入网设备根据第三消息获得终端设备在小区2的TA和用于终端设备接入小区2的配置信息。
当第二接入网设备和第一接入网设备为同一个实体，即小区2和小区1共站时，第二接入网设备计算终端设备在小区2的TA也就是第一接入网设备计算终端设备在小区2的TA，因此不必执行步骤1606。
1607、第一接入网设备向终端设备发送第一消息。
相应的，终端设备接收来自第一接入网设备的第一消息。步骤1607可参阅步骤1501。
1608、终端设备向第一接入网设备发送第二消息。
第二消息用于指示终端设备已经收到上述第一消息。或者说，第二消息所述终端设备已完成所述目标小区的配置，例如配置终端设备在目标小区的TA。可选的，终端设备接收到第一消息之后，开始评估是否满足向目标小区切换的条件。例如，上述条件是满足一种测量事件；终端设备接收上述第一消息之后，可按预先约定的测量事件进行测量。又例如，上述条件是接收到一条信令；终端设备接收上述第一消息之后，可尝试/准备接受对应信令等。
1609、终端设备评估是否满足向目标小区切换的条件。
步骤1609可参阅步骤1503。
在一种可能的实现方式中，若上述条件为某信令的接收，小区1(休眠前)/小区2(展宽后)向终端设备发送一条该终端设备满足上述条件的信令。也就是说，第一接入网设备可在小区1休眠前，向终端设备发送一条该终端设备满足上述条件的信令。或者，第二接入网设备可在完成对小区2的覆盖展宽之后，向终端设备发送一条该终端设备满足上述条件的信令。
在一种可能的实现方式中，若上述条件为某测量事件的满足，小区1和小区2的覆盖变化导致小区测量结果发生变化从而满足该测量事件。
1610、第二接入网设备对小区2的覆盖进行扩展。
1611、第一接入网设备控制小区1休眠。
步骤1610和步骤1611的先后顺序不作限定。
在一种可能的实现方式中，在完成对小区2的覆盖展宽之后，第一接入网设备控制小区1休眠。这样可以避免接入小区1的终端设备不能及时接入小区2。
1612、若满足终端设备向目标小区切换的条件，终端设备根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换。
在一种可能的实现方式中，终端设备完成小区2(即目标小区)的切换之后，向小区2回复RRCReconfigurationComplete消息，该RRCReconfigurationComplete消息指示终端设备已完成小区切换。
本申请实施例中，终端设备进行小区切换之前，接收第一接入网设备的第一消息。终端设备在切换前可提前获得目标小区的配置以及上下行同步，且配置了向目标小区切换的条件，终端设备需要切换时，无需网络向终端发送切换信令触发，且可根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换，不需要花费时间来获取终端设备在目标小区的TA；能够进一步降低小区切换的时延。另外，终端设备在小区2完成覆盖扩展之前，检测小区2的同步信号以完成下行同步；可以在向小区2切换之前，实现下行同步。可见，小区切换过 程中采用本申请实施例提供的提前同步的方法，进一步降低了小区的小区切换时延，减少了旧小区(即小区1)和目标小区(小区2)覆盖重叠的时间，提升用户体验；加快了小区1进入休眠的速度，使节能效果提升。
下面结合小区恢复时的小区切换场景，介绍本申请实施例提供的提前同步的方法在小区切换中的应用。图17为本申请实施例提供的另一种小区切换的方法流程图。图1A为图17的方法流程适用的一个小区切换场景的示例。图17的方法流程适用的一个小区切换场景的示例如下：小区2处于覆盖扩展状态(可视为扩展的小区2)，小区1处于休眠状态，终端设备已接入小区2，小区2即将复原(取消扩展)，小区1即将恢复运行。小区2即将复原可理解为小区2即将从覆盖扩展状态调整为正常工作状态。小区1即将恢复运行可理解为小区1即将从休眠状态调整为正常工作状态。因此终端设备需执行小区切换，由小区2切换至小区1(恢复运行的小区1)。本申请实施例中，小区2对应的实体为第一接入网设备，第一接入网设备执行的操作可理解为小区2执行的操作；小区1对应的实体为第二接入网设备，第二接入网设备执行的操作可理解为小区1执行的操作。小区1可视为上述目标小区的示例。如图17所示，该方法流程可包括：
1701、第二接入网设备对小区1进行同步波束的覆盖。
步骤1701一种可能的实现方式如下：第二接入网设备在小区1的覆盖内周期性发送同步波束。
1702、第一接入网设备向终端设备发送第一指示信息和第二指示信息。
步骤1702可参阅步骤501。
1703、终端设备检测小区1的同步信号以完成下行同步。
步骤1703可参阅步骤302。
1704、终端设备根据第二指示信息，向小区1发送第一上行信号。
步骤1704可参阅步骤303。
1705、第二接入网设备根据第一上行信号，计算终端设备在小区1的TA。
1706、第二接入网设备向第一接入网设备发送第三消息。
第三消息可包括终端设备在小区1的TA和用于终端设备接入小区1的配置信息。
步骤1706是可选的。当第二接入网设备和第一接入网设备为不同的实体，即小区2和小区1不共站时，第二接入网设备在执行步骤1705之后，执行步骤1706，以便第一接入网设备根据第三消息获得终端设备在小区1的TA和用于终端设备接入小区1的配置信息。
当第二接入网设备和第一接入网设备为同一个实体，即小区2和小区1共站时，第二接入网设备计算终端设备在小区1的TA也就是第一接入网设备计算终端设备在小区1的TA，因此不必执行步骤1706。
1707、第一接入网设备向终端设备发送第一消息。
步骤1707可参阅步骤1501。
1708、终端设备向第一接入网设备发送第二消息。
步骤1708可参阅步骤1608。
1709、终端设备评估是否满足向目标小区切换的条件。
步骤1709可参阅步骤1503。
在一种可能的实现方式中，若上述条件为某信令的接收，小区1(重启恢复后)/小区2(复原前)向终端设备发送一条该终端设备满足上述条件的信令。也就是说，第二接入网设 备可在小区1重启恢复(即完全恢复小区1的运行)后，向终端设备发送一条该终端设备满足上述条件的信令。或者，第一接入网设备可在取消小区2的扩展(即小区2复原)前，向终端设备发送一条该终端设备满足上述条件的信令。
在一种可能的实现方式中，若上述条件为某测量事件的满足，小区1和小区2的覆盖变化导致小区测量结果发生变化从而满足该测量事件。
1710、第二接入网设备完全恢复小区1的运行。
步骤1710可参阅步骤907。
1711、第一接入网设备取消小区2的扩展。
步骤1711可参阅步骤910。步骤1710和步骤1711的先后顺序不作限定。
在一种可能的实现方式中，在完全恢复小区1的运行之后，第一接入网设备取消小区2的扩展。
1712、若满足终端设备向目标小区切换的条件，终端设备根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换。
在一种可能的实现方式中，终端设备完成小区1(即目标小区)的切换之后，向小区1回复RRCReconfigurationComplete消息，该RRCReconfigurationComplete消息指示终端设备已完成小区切换。
本申请实施例中，终端设备进行小区切换之前，接收第一接入网设备的第一消息。终端设备在切换前可提前获得目标小区的配置以及上下行同步，且配置了向目标小区切换的条件，终端设备需要切换时，无需网络向终端发送切换信令触发，且可根据目标小区的配置信息和终端设备在目标小区的TA进行小区切换，不需要花费时间来获取终端设备在目标小区的TA；能够进一步降低小区切换的时延。另外，终端设备在小区1完全恢复运行之前，检测小区1的同步信号以完成下行同步；可以向小区1切换之前，实现下行同步。可见，小区切换过程中采用本申请实施例提供的提前同步的方法，降低了小区的小区切换时延，减少了原小区(即小区2)和目标小区(小区1)覆盖重叠的时间，提升用户体验；加快了小区1从休眠中恢复的速度，减轻了小区休眠对用户体验的影响。结合图16和图17的方法流程可知，本申请实施例提供的提前同步的方法可减少了原小区和目标小区覆盖重叠的时间，增强节能效果。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以上述权利要求的保护范围为准。

Claims (27)

  1. 一种提前同步的方法，其特征在于，包括：
    终端设备接收来自第一接入网设备的第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的时间提前量TA，所述目标小区不属于所述终端设备当前接入的小区；
    所述终端设备向所述第一接入网设备发送第二消息；所述第二消息指示所述终端设备已完成所述目标小区的配置。
  2. 根据权利要求1所述的方法，其特征在于，所述第一消息为无线资源控制RRC重配置消息，所述第二消息为RRC重配置完成消息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
  4. 根据权利要求1至3任一项所述的方法，其特征在于，在终端设备接收来自第一接入网设备的第一消息之前，所述方法还包括：
    所述终端设备接收来自所述第一接入网设备的第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
  5. 根据权利要求4所述的方法，其特征在于，所述终端设备接收所述第一指示信息之前，所述目标小区已完成同步波束覆盖。
  6. 根据权利要求5所述的方法，其特征在于，所述终端设备接收来自所述第一接入网设备的第一指示信息和第二指示信息之后，终端设备接收来自第一接入网设备的第一消息之前，所述方法还包括：
    所述终端设备检测所述目标小区的同步信号以完成下行同步；
    所述终端设备根据所述第二指示信息，向所述目标小区发送第一上行信号，所述第一上行信号用于确定所述终端设备在所述目标小区的TA。
  7. 根据权利要求1至6任一项所述的方法，其特征在于，所述第一消息还包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    终端对所述条件进行评估；
    在满足所述条件的情况下，所述终端设备根据所述终端设备在所述目标小区的TA进行小区切换。
  9. 根据权利要求7或8所述的方法，其特征在于，所述条件包括以下一项或多项：所述终端设备测量的其当前接入的小区的信号质量低于第一阈值；所述终端设备测量的所述目标小区的信号质量高于或等于第二阈值。
  10. 根据权利要求7或8所述的方法，其特征在于，所述满足所述条件的情况包括接收到用于指示满足所述条件的信息。
  11. 一种提前同步的方法，其特征在于，包括：
    第一接入网设备向终端设备发送第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；
    所述第一接入网设备接收来自所述终端设备的第二消息，所述第二消息指示所述终端设备已完成所述目标小区的配置。
  12. 根据权利要求11所述的方法，其特征在于，所述第一消息为无线资源控制RRC重配置消息，所述第二消息为RRC重配置完成消息。
  13. 根据权利要求11或12所述的方法，其特征在于，所述第一消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
  14. 根据权利要求11至13任一项所述的方法，其特征在于，在第一接入网设备向终端设备发送第一消息之前，所述方法还包括：
    所述第一接入网设备向所述终端设备发送第一指示信息和第二指示信息，所述第一指示信息指示所述终端设备进行同步相关操作，所述第二指示信息指示所述终端设备向所述目标小区发送上行信号可用的时频资源。
  15. 根据权利要求14所述的方法，其特征在于，所述第一接入网设备向所述终端设备发送第一指示信息包括：
    所述第一接入网设备在所述目标小区已完成同步波束覆盖之后，向所述终端设备发送所述第一指示信息。
  16. 根据权利要求14所述的方法，其特征在于，所述第一接入网设备向所述终端设备发送第一指示信息和第二指示信息之后，在第一接入网设备向终端设备发送第一消息之前，所述方法还包括：
    所述第一接入网设备接收来自所述终端设备的第一上行信号；所述第一上行信号用于获取所述终端设备在所述目标小区的TA，所述第一接入网设备属于所述目标小区对应的实体；
    或者，所述第一接入网设备接收来自第二接入网设备的第三消息，所述第三消息包含所述终端设备在所述目标小区的TA，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备和所述第二接入网设备属于不同的实体。
  17. 根据权利要求11至16任一项所述的方法，其特征在于，所述第一消息包括第三指示信息，所述第三指示信息用于指示所述终端设备向所述目标小区切换的条件。
  18. 根据权利要求17所述的方法，其特征在于，在向终端设备发送第一消息之后，所述方法还包括：
    在所述终端设备当前接入的小区休眠或恢复覆盖之前，向所述终端设备发送用于指示满 足所述条件的信息。
  19. 一种提前同步的方法，其特征在于，包括：
    第二接入网设备向第一接入网设备发送第三消息，所述第三消息用于所述第一接入网设备获得终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备属于所述终端设备当前接入的小区对应的实体。
  20. 根据权利要求19所述的方法，其特征在于，在第二接入网设备向第一接入网设备发送第三消息之前，所述方法还包括：
    所述第二接入网设备接收来自所述终端设备的第一上行信号；
    所述第二接入网设备根据所述第一上行信号，确定所述终端设备在所述目标小区的TA。
  21. 根据权利要求19或20所述的方法，其特征在于，所述第三消息包含所述终端设备在所述目标小区的TA和/或所述目标小区的配置信息。
  22. 根据权利要求19至21任一项所述的方法，其特征在于，所述方法还包括：
    对所述目标小区的部分或全部波束覆盖进行展宽；
    在完成对所述目标小区的波束覆盖进行展宽之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
  23. 根据权利要求19至21任一项所述的方法，其特征在于，所述方法还包括：
    在完全恢复所述目标小区的运行之后，向所述终端设备发送用于指示所述终端设备满足向所述目标小区切换的条件的信息。
  24. 一种通信装置，其特征在于，包括：
    收发模块，用于接收来自第一接入网设备的第一消息；所述第一消息用于终端设备获得所述终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区；
    所述收发模块，还用于向所述第一接入网设备发送第二消息；所述第二消息指示所述终端设备已完成所述目标小区的配置。
  25. 一种通信装置，其特征在于，包括：
    收发模块，用于向终端设备发送第一消息；所述第一消息用于所述终端设备获得所述终端设备在目标小区的，所述目标小区不属于所述终端设备当前接入的小区；
    所述收发模块，还用于接收来自所述终端设备的第二消息，所述第二消息指示所述终端设备已完成所述目标小区的配置。
  26. 一种通信装置，其特征在于，包括：
    处理模块，用于向第一接入网设备发送第三消息，所述第三消息用于所述第一接入网设备获得终端设备在目标小区的TA，所述目标小区不属于所述终端设备当前接入的小区，所述第二接入网设备属于所述目标小区对应的实体，所述第一接入网设备属于所述终端设备当前 接入的小区对应的实体。
  27. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机程序，所述计算机程序包括程序指令，所述程序指令当被处理器执行时，使所述处理器执行权利要求1至23任意一项所述的方法。
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