WO2024022035A1 - 小区测量方法及装置 - Google Patents

小区测量方法及装置 Download PDF

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Publication number
WO2024022035A1
WO2024022035A1 PCT/CN2023/105243 CN2023105243W WO2024022035A1 WO 2024022035 A1 WO2024022035 A1 WO 2024022035A1 CN 2023105243 W CN2023105243 W CN 2023105243W WO 2024022035 A1 WO2024022035 A1 WO 2024022035A1
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WIPO (PCT)
Prior art keywords
cell
candidate
candidate cell
terminal device
cells
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PCT/CN2023/105243
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English (en)
French (fr)
Inventor
李娇娇
强鹂
常俊仁
毛颖超
谢曦
Original Assignee
华为技术有限公司
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Publication of WO2024022035A1 publication Critical patent/WO2024022035A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements

Definitions

  • the present application relates to the field of wireless communication technology, and in particular, to a cell measurement method and device.
  • conditional primary and secondary cell addition or change Conditional PSCell Addition/Change, CPAC
  • conditional layer 1 or layer 2 handover Conditional L1/L2 Handover
  • layer 1 is the physical layer and layer 2 includes media access control (Media Access Control).
  • Control MAC
  • Radio Link Control RLC
  • Packet Data Convergence Control PDCP
  • the network may need to configure more candidate cells for terminal equipment for continuous cell handover. As the terminal equipment moves, not all candidate cells are suitable for the terminal equipment to perform the cell handover process. Then, if the terminal equipment measures or evaluates all candidate cells to determine the target cell for handover, there will be problems such as unclear measurement cell range, low cell handover efficiency, and unnecessary power overhead.
  • Embodiments of the present application provide a cell measurement method and device to clarify the cell range for terminal equipment measurement and evaluation, thereby improving the efficiency and success rate of cell handover.
  • a cell measurement method is provided.
  • the execution subject of the method may be a terminal device or a chip applied in the terminal device.
  • the following description takes the execution subject being a terminal device as an example.
  • the terminal device receives first indication information.
  • the first indication information is used to indicate at least one candidate cell and a first cell set corresponding to the first candidate cell in the at least one candidate cell.
  • the first cell set includes at least one cell.
  • the terminal device measures the cells in the first cell set according to the first indication information, where the serving cell of the terminal device is the first candidate cell.
  • the first indication information is obtained, and the first indication information is used to indicate at least one candidate cell, and the first cell set corresponding to the first candidate cell in the at least one candidate cell.
  • the terminal equipment performs cell measurement according to the first cell set indicated by the first indication information.
  • the cells measured and evaluated by the UE are not limited to at least one candidate cell configured for the terminal equipment, thereby improving the success rate of the terminal equipment switching cells.
  • At least one candidate cell adds a CPA to the conditional primary and secondary cells or changes the CPC of the conditional primary and secondary cells.
  • the cell measurement method is applied to the conditional primary and secondary cell adding CPA or the conditional primary and secondary cell changing CPC scenario, so that in the CPA or CPC scenario, especially in the case of continuous cell switching, the terminal can
  • the serving cell of the device determines the cell range for measurement and evaluation by the terminal device, improving the efficiency and success rate of cell handover.
  • At least one candidate cell is at least one candidate primary cell for layer 1/layer 2 handover.
  • the cell measurement method is applied to the layer 1/layer 2 handover scenario, so that in the layer 1/layer 2 scenario, especially in the case of continuous cell handover, the terminal device can be based on the serving cell of the terminal device. Determine the cell range for terminal equipment to perform measurement and evaluation, and improve the efficiency and success rate of cell handover.
  • the first indication information is used to indicate the first set of cells corresponding to the first candidate cell in the at least one candidate cell, including: the first indication information indicates the physical cell identity PCI of the at least one cell. A first set of cells corresponding to a candidate cell; or the first indication information indicates a first set of cells corresponding to the first candidate cell by indicating a configuration identifier of at least one cell, wherein the configuration identifier is consistent with the configuration of the candidate cell in the at least one candidate cell. Association; or the first indication information indicates the first set of cells corresponding to the first candidate cell through bit mapping indication information.
  • At least one cell included in the first cell set is a cell in at least one candidate cell.
  • the cells in the first cell set are at least one cell among the candidate cells, so the cells measured and evaluated by the terminal equipment during handover are usually smaller than the set composed of all candidate cells, which can reduce the time required for the terminal equipment to perform cell handover.
  • the number of cells that need to be measured and evaluated improves cell switching efficiency and reduces the power consumption of the measured and evaluated cells.
  • a cell measurement method is provided.
  • the execution subject of the method may be a network device or a chip applied in the network device.
  • the following description takes the execution subject being a network device as an example.
  • the network device determines first indication information.
  • the first indication information is used to indicate at least one candidate cell and a first cell set corresponding to the first candidate cell in the at least one candidate cell.
  • the first cell set includes at least one cell.
  • the network device sends first indication information.
  • At least one candidate cell adds a CPA to the conditional primary and secondary cells or changes the CPC of the conditional primary and secondary cells.
  • At least one candidate cell is at least one candidate primary cell for layer 1/layer 2 handover.
  • the first indication information is used to indicate the first set of cells corresponding to the first candidate cell in the at least one candidate cell, including: the first indication information indicates the physical cell identity PCI of the at least one cell. A first set of cells corresponding to a candidate cell; or the first indication information indicates a first set of cells corresponding to the first candidate cell by indicating a configuration identifier of at least one cell, wherein the configuration identifier is consistent with the configuration of the candidate cell in the at least one candidate cell. Association; or the first indication information indicates the first set of cells corresponding to the first candidate cell through bit mapping indication information.
  • At least one cell included in the first cell set is a cell in at least one candidate cell.
  • the method further includes: determining a first cell set corresponding to the first candidate cell based on at least one of the following information: measurement reports reported by terminal devices, network topology information, network deployment information, and statistical information.
  • the method before determining the first cell set corresponding to the first candidate cell, the method further includes: sending a request message to the second network device, for requesting to use the cell of the second network device as at least one candidate. A cell among the cells; receiving feedback information from the second network device, and determining whether to use the cell of the second network device as one of at least one candidate cell according to the feedback information.
  • the feedback information is also used to indicate a second cell set corresponding to the cell of the second network device; the method further includes: determining the cell of the second network device as the first candidate cell according to the second cell set. , the corresponding first cell set.
  • a communication method which is characterized in that the execution subject of the method may be a terminal device or a chip applied in the terminal device.
  • the following description takes the execution subject being a terminal device as an example.
  • the method includes: the terminal device receives a first message, where the first message includes configuration information of the candidate cell. When the first condition is met, the terminal device sends a second message to the first network device. The second message is used to request an update of the configuration information of the candidate cell.
  • the first condition includes at least one of the following: signal quality of the serving cell. is less than or equal to the first threshold; or the number of candidate cells that can finally be detected is less than or equal to the first number; or the signal quality of the candidate cells is less than or equal to the second threshold.
  • the terminal device when the first condition is met, the terminal device may be triggered to send a second message to the first network device for requesting to update the configuration information of the candidate cell.
  • the terminal device actively requests the network device to update the configuration information of the candidate cell, so that the terminal device can instantly obtain the most accurate configuration information of the candidate cell in order to perform cell switching. This improves the probability of successful cell handover and reduces the cell handover delay caused by the inability to obtain valid configuration information of candidate cells in time.
  • a communication method is provided.
  • the execution subject of the method may be a terminal device or a chip applied in the terminal device.
  • the following description takes the execution subject being a terminal device as an example.
  • the method includes: a terminal device receives a first message, where the first message includes configuration information of a candidate cell.
  • the terminal device is triggered to send a measurement report to the first network device.
  • the measurement report includes the signal quality of the candidate cell.
  • the second condition includes at least one of the following: the signal quality of the serving cell is less than or equal to the second threshold.
  • the number of candidate cells that the terminal device can detect is less than or equal to the second number; or the signal quality of the candidate cells is less than or equal to the third threshold; or the serving cell is switched to the first cell, and the first cell is in the first cell set one; or the signal quality of one or more cells except the candidate cell is greater than or equal to the fourth threshold.
  • the terminal device when the second condition is met, the terminal device may be triggered to send a measurement report to the first network device for the first network device to refer to how to update the configuration information of the candidate cell. In this way, the terminal device actively sends the measurement report to the network device. Compared with the existing technology that feeds back the measurement report based on the measurement configuration, or periodically sends the measurement report, the measurement report can be fed back more flexibly and timely, so that the network device can quickly and accurately Determine a solution for updating the configuration information of the candidate cell. Thus, the success rate of the cell handover process is improved.
  • the configuration information of the candidate cell is to add a CPA for the conditional primary and secondary cells or to change the CPC configuration information for the conditional primary and secondary cells, and the second message is used to update the configuration information of the CPA or CPC; or the configuration information of the candidate cell is Configuration information of the candidate cell for Layer 1/Layer 2 handover. The second message is used to request to update the configuration information of Layer 1/Layer 2 handover.
  • the method adopted in the embodiment of this application can enable the network device to obtain the CPAC configuration information in the CPA or CPC scenario, especially in the case of continuous cell switching, compared with the normal situation where the MN determines to add or change the SN ( That is, the CPA or CPC configuration information) method can update the CPAC configuration information in a more timely manner based on the received measurement reports, improving the SN switching efficiency and success rate.
  • the method of the embodiment of the present application can update Layer 1/Layer 1/Layer 2 in a more timely and rapid manner. 2 switching configuration information, thereby improving DU switching efficiency and success rate.
  • the method further includes: the terminal device receives a third message, the third message is used to instruct the terminal device to switch to the target cell, where the target cell does not belong to the candidate cell; the terminal device switches to the target cell, and executes Either of the following: treating the configuration information of the candidate cell as valid or saving; or determining whether the configuration information of the candidate cell is valid or invalid according to the instruction information from the first network device.
  • the terminal device when the terminal device receives instruction information instructing it to switch to a target cell that does not belong to the candidate cell, the terminal device can determine according to the preset information to regard the configuration information of the candidate cell as valid or to save it, thereby reducing the cost of the terminal device.
  • the terminal device determines the configuration information of the candidate cell according to the instruction information of the first network device, which can improve the flexibility of the terminal device in processing the configuration information of the candidate cell.
  • the method further includes: the terminal device triggers a radio resource management RRC reconstruction process, and the cell selected by the RRC reconstruction process belongs to the first network device; the terminal device considers the configuration information of the candidate cell to be valid or saves it.
  • the terminal device triggers the RRC reconstruction process, and the selected cell belongs to the first network device, which means that the serving cell of the terminal device has not changed, or the terminal device is close to the original serving cell and can continue to be retained or used.
  • the received configuration information of the candidate cell reduces the resource overhead of retransmitting the configuration information of the candidate cell.
  • a communication method is provided.
  • the execution subject of the method may be a first network device or a chip applied in the first network device.
  • the following description takes the execution subject being the first network device as an example.
  • the method includes: a first network device determines configuration information of a candidate cell.
  • the first network device sends a first message, where the first message includes configuration information of the candidate cell.
  • the first network device receives a first message or a measurement report, where the first message is used to request updating of candidate cell configuration information, and the measurement report includes signal quality of the candidate cell.
  • the configuration information of the candidate cell is to add a CPA for the conditional primary and secondary cells or to change the CPC configuration information for the conditional primary and secondary cells.
  • the first message is used to request to update the CPA or CPC configuration information; or the configuration information of the candidate cell.
  • the first message is the configuration information of the candidate cell for layer 1/layer 2 handover, and the first message is used to request to update the configuration information of layer 1/layer 2 handover.
  • a communication device in a sixth aspect, includes: a receiving module, configured to receive first indication information, the first indication information being used to indicate at least one candidate cell, and a corresponding number of the first candidate cell in the at least one candidate cell.
  • the first cell set includes at least one cell; and the processing module is configured to cause the terminal device to measure the cells in the first cell set according to the first indication information, where the serving cell of the terminal device is the first candidate cell.
  • At least one candidate cell adds a CPA to the conditional primary and secondary cells or changes the CPC of the conditional primary and secondary cells.
  • At least one candidate cell is at least one candidate primary cell for layer 1/layer 2 handover.
  • the first indication information indicates at least one cell in the first cell set in any one of the following ways: the physical cell identity PCI of at least one cell; or the configuration identity of at least one cell, where the configuration identity Associated with the configuration of a candidate cell in at least one candidate cell; or bit mapping indication information.
  • At least one cell included in the first cell set is a cell in at least one candidate cell.
  • a communication device in a seventh aspect, includes: a processing module configured to determine first indication information, the first indication information being used to indicate at least one candidate cell, and a corresponding number of the first candidate cell in the at least one candidate cell.
  • the first cell set includes at least one cell; the sending module is configured to send the first indication information.
  • At least one candidate cell adds a CPA to the conditional primary and secondary cells or changes the CPC of the conditional primary and secondary cells.
  • At least one candidate cell is at least one candidate primary cell for layer 1/layer 2 handover.
  • the first indication information indicates at least one cell in the first cell set in at least one of the following ways: a physical cell identity PCI of at least one cell; or a configuration identity of at least one cell, where the configuration identity Associated with the configuration of a candidate cell in at least one candidate cell; or bit mapping indication information.
  • At least one cell included in the first cell set is a cell in at least one candidate cell.
  • a communication device which device includes: a receiving module, configured to receive a first message, where the first message includes configuration information of a candidate cell; and a sending module, configured to send a message to the first message when the first condition is satisfied.
  • a network device sends a second message.
  • the second message is used to request to update the configuration information of the candidate cell.
  • the first condition includes at least one of the following: the signal quality of the serving cell is less than or equal to the first threshold; or the candidate cell can finally be detected. The number is less than or equal to the first number; or the signal quality of the candidate cell is less than or equal to the second threshold.
  • a communication device configured to include: a receiving module, configured to receive a first message, the first message including configuration information of a candidate cell; and a sending module, configured to trigger a notification to the candidate cell when the second condition is met.
  • the first network device sends a measurement report, the measurement report includes the signal quality of the candidate cells, and the second condition includes at least one of the following: the signal quality of the serving cell is less than or equal to the second threshold; or the number of candidate cells that can be detected is less than or equal to The second number; or the signal quality of the candidate cell is less than or equal to the third threshold; or the serving cell is switched to the first cell, and the first cell is one of the first cell set; or one or more cells other than the candidate cell
  • the signal quality is great is at or equal to the fourth threshold.
  • the configuration information of the candidate cell adds a CPA for the conditional primary and secondary cells or changes the CPC configuration information for the conditional primary and secondary cells, and the second message is used to update the configuration information of the CPA or CPC; or
  • the configuration information of the candidate cell is the configuration information of the candidate cell for layer 1/layer 2 handover, and the second message is used to request to update the configuration information of layer 1/layer 2 handover.
  • the receiving module is also configured to: receive a third message, the third message is used to instruct the device to switch to the target cell, where the target cell does not belong to the candidate cell; the device also includes a processing module, configured to execute Switch to the target cell and perform any of the following: treating the configuration information of the candidate cell as valid or saving; or determining whether the configuration information of the candidate cell is valid or invalid according to the instruction information from the first network device.
  • the device includes a processing module configured to: trigger a radio resource management RRC reconstruction process, where the cell selected by the RRC reconstruction process belongs to the first network device; and consider the configuration information of the candidate cell as valid or save it.
  • a communication device in a tenth aspect, includes: a processing module for determining configuration information of a candidate cell; a sending module for sending a first message, where the first message includes the configuration information of the candidate cell; a receiving module for Upon receiving the first message or measurement report, the first message is used to request updating of candidate cell configuration information, and the measurement report includes signal quality of the candidate cell.
  • the configuration information of the candidate cell is to add a CPA for the conditional primary and secondary cells or to change the CPC configuration information for the conditional primary and secondary cells.
  • the first message is used to request to update the CPA or CPC configuration information; or the configuration information of the candidate cell.
  • the first message is the configuration information of the candidate cell for layer 1/layer 2 handover, and the first message is used to request to update the configuration information of layer 1/layer 2 handover.
  • embodiments of the present application provide a terminal device, including:
  • At least one processor coupled to said memory
  • the instruction when the at least one processor executes the instruction, the instruction causes the processor to execute the method described in any one of the first aspect, the third aspect or the fourth aspect.
  • embodiments of the present application provide a network device, including:
  • At least one processor coupled to said memory
  • the instruction when the at least one processor executes the instruction, the instruction causes the processor to execute the method described in any one of the second aspect or the fifth aspect.
  • embodiments of the present application provide a chip system, including: a processor, the processor is coupled to a memory, and the memory is used to store programs or instructions. When the program or instructions are executed by the processor When, the chip system is allowed to implement the method of any one of the above first to fifth aspects.
  • the chip system further includes an interface circuit for exchanging code instructions to the processor.
  • processors in the chip system there may be one or more processors in the chip system, and the processor may be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, or the like.
  • the processor may be a general-purpose processor implemented by reading software code stored in memory.
  • the memory may be integrated with the processor or may be provided separately from the processor, which is not limited by this application.
  • the memory can be a non-transient processor, such as a read-only memory ROM, which can be integrated on the same chip as the processor, or can be separately provided on different chips.
  • This application describes the type of memory, and the relationship between the memory and the processor. There is no specific limitation on how the processor is configured.
  • embodiments of the present application provide a computer-readable storage medium on which a computer program or instructions are stored.
  • the computer program or instructions When executed, the computer is caused to execute any one of the above-mentioned first to fifth aspects. aspect methods.
  • embodiments of the present application provide a computer program product, which when a computer reads and executes the computer program product, causes the computer to execute the method in any of the possible implementations of the first to fifth aspects. .
  • embodiments of the present application provide a communication system, which includes the above-mentioned sixth aspect, and/or includes the device of the seventh aspect; or the communication system includes the above-mentioned eighth or ninth aspect. device, and/or a device including the tenth aspect.
  • Figure 1 is a schematic structural diagram of a dual connection provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of an NG-RAN architecture provided by an embodiment of the present application.
  • Figure 3 is a schematic diagram of a switching process provided by an embodiment of the present application.
  • Figure 4A is a CPA flow chart provided by an embodiment of the present application.
  • Figure 4B is a CPC flow chart provided by an embodiment of the present application.
  • Figure 4C is a schematic diagram of a continuous CPAC provided by an embodiment of the present application.
  • Figure 5A is a schematic diagram of an L1/L2 handover process provided by an embodiment of the present application.
  • Figure 5B is a schematic diagram of a conditional L1/L2 switching process provided by an embodiment of the present application.
  • Figure 5C is a schematic diagram of a continuous L1/L2 switching scenario provided by an embodiment of the present application.
  • Figure 6A is a flow chart of a cell measurement method provided by an embodiment of the present application.
  • Figure 6B is a correspondence diagram between a bitmap and candidate cells provided by an embodiment of the present application.
  • Figure 7A is a flow chart of a communication method provided by an embodiment of the present application.
  • Figure 7B is a schematic diagram of the position movement of a terminal device provided by an embodiment of the present application.
  • Figure 8 is a flow chart of a communication method provided by an embodiment of the present application.
  • Figure 9 is a flow chart of a communication method provided by an embodiment of the present application.
  • Figure 10 is a flow chart of another communication method provided by an embodiment of the present application.
  • Figure 11 is a structural block diagram of a communication device provided by an embodiment of the present application.
  • Figure 12 is a schematic diagram of the hardware structure of a communication device in an embodiment of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances 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.
  • Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments. Different embodiments herein may also be used in combination.
  • “Plural” means two or more. "And/or” describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character “/” generally indicates that the related objects are in an "or” relationship.
  • Mobility management is to change the serving cell of the terminal equipment (user equipment, UE) so that the UE can enjoy network services no matter how it moves within the network coverage. Connected state mobility is accomplished through handover.
  • UE user equipment
  • Dual connectivity Dual-Connectivity (DC) or Multi-Radio Dual Connectivity (MR-DC) means that the UE can communicate with two base stations at the same time.
  • One of the two base stations can be a New Radio. NR) base station, one is a Long Term Evolution (LTE) base station, or both are NR base stations.
  • NR New Radio
  • LTE Long Term Evolution
  • NR base stations the one that provides control plane connection with the core network
  • MN Master Node
  • secondary node secondary node.
  • SN Secondary Node
  • SN secondary Node
  • each base station can include a Cell Group (CG): the cell group under the master station is the master cell group (Master Cell Group, MCG), and the auxiliary cell group is The cell group under the station is the Secondary Cell Group (SCG).
  • the primary cell group may include a primary cell (PCell) and a secondary cell (SCell), and the secondary cell group may include a primary cell (PSCell) and a secondary cell (SCell).
  • FIG. 2 is a schematic diagram of an NG-RAN architecture provided by an embodiment of the present application.
  • 5G Radio Access Network Next Generation Radio Access Network, NG- RAN
  • DU distributed Unit
  • CU convergence unit
  • DU includes the physical layer (mainly including the high-level physical layer, namely high-PHY), media access control (Media Access Control, MAC) layer and radio link control (Radio Link Control).
  • RLC Radio Link Control
  • CU includes packet data convergence control (Packet Data Convergence Control, PDCP) layer and radio resource management (Radio Resource Control, RRC) layer.
  • PDCP Packet Data Convergence Control
  • RRC Radio Resource Control
  • NG-RAN may also include an active antenna processing unit (Active Antenna Processing Unit, AAU), which includes a low-layer physical layer (i.e., low-PHY), a radio frequency unit (Radio Frequency, RF), and an antenna.
  • AAU Active Antenna Processing Unit
  • L1 is the physical layer
  • L2 includes the MAC layer
  • L3 is the RRC layer.
  • Handover is completed through the RRC layer. Please refer to Figure 3.
  • Figure 3 is a schematic diagram of a handover process provided by an embodiment of the present application. The specific process is as follows:
  • the source base station performs measurement configuration on the UE
  • the UE reports measurement results according to the measurement configuration, and the UE’s measurement results are used to assist the source base station in making handover decisions;
  • the source base station refers to the measurement results reported by the UE and makes a handover decision based on its own handover algorithm
  • the source base station sends a handover request to the target base station, transmitting necessary relevant information for handover preparation.
  • This information at least includes the target cell identifier, key, terminal ID in the source cell, basic access layer configuration, etc.;
  • the target base station performs access control
  • the target base station prepares for L1/L2 handover and sends a handover request response message (Acknowledge, ACK) to the source base station, where the handover command sent to the UE is included in the ACK message in the form of an RRC container (container);
  • ACK handover request response message
  • the source base station triggers handover (HandOver, HO) and sends a handover command (HO Command) to the UE.
  • the handover command is generated by the target base station and transparently transmitted through the source base station (specifically, it can be sent through an RRC reconfiguration message containing synchronization information).
  • the source base station can perform necessary encryption and integrity protection on the message.
  • the handover command contains the information needed to access the target cell, including at least the target cell identifier, new UE ID, security algorithm identifier of the target base station, and may also carry a dedicated random access channel (Random Access Channel, RACH) for accessing the target cell. ) resources, etc.;
  • RACH dedicated random access channel
  • the source base station sends the sequence number status transfer (status transfer) to the target base station;
  • the UE After receiving the handover command, the UE performs synchronization with the target base station to communicate with the target base station after the handover is successful;
  • the target base station replies with a Random Access Response (RAR), performs uplink resource allocation (Uplink grant) and timing advance (Timing Advance, TA);
  • RAR Random Access Response
  • Uplink grant Uplink grant
  • Timing Advance Timing Advance
  • the UE sends an RRC reconfiguration completion message to the target base station to confirm the completion of the handover process to the target base station.
  • This message may also be accompanied by the sending of an uplink buffer status report (Buffer Status Report, BSR).
  • BSR Buffer Status Report
  • the target base station confirms the success of the handover process by receiving the RRC reconfiguration completion message. At this point, the target base station can start sending data to the terminal;
  • the target base station sends a path conversion request message to the Authentication Management Function (AMF) to inform the AMF that the cell has been changed, triggering the core network (5GC) to convert the downlink (DL) data path to the target base station, and establish the path to the target base station.
  • AMF Authentication Management Function
  • 5GC core network
  • AMF sends a user plane (User Plane, UP) update request message to the user plane function (User Plane Function, UPF);
  • UPF switches the DL data path to the target base station.
  • UPF sends one or more end tags to the source cell, and then the UP resources or transmission network layer resources between the remaining source base stations can be released;
  • UPF sends an UP update response message to AMF
  • AMF sends the path conversion ACK message to the target base station
  • the target base station After receiving the path switching ACK message, the target base station sends a UE context release message to the source base station, notifying the source base station that the handover is successful and triggering the source base station to release the UE context;
  • the source base station can release the radio bearer and control plane (Control Plane, CP) resources related to the UE context. If the data forwarding has not been completed, the source base station will not release the relevant resources and will continue to forward the data until the data forwarding is completed before releasing the relevant resources.
  • Radio Bearer and control plane Control Plane, CP
  • Conditional PSCell Addition/Change refers to the conditional PSCell Addition (CPA) and conditional PSCell Change (Conditional PSCell Change, CPC) processes. Both CPA and CPC are aimed at the addition or change of the secondary station primary cell (PSCell) in the DC scenario.
  • the main idea is: the network configures multiple candidate PSCell cells, and each candidate PSCell cell configuration includes the configuration and execution conditions of the cell. When the execution conditions are met, the UE can autonomously perform the addition or change of PSCell.
  • the CPA process is to execute the PSCell addition process when the PSCell addition conditions are met.
  • Figure 4A is a CPA flow chart provided by an embodiment of the present application. Taking the CPA triggered by the MN in the MR-DC scenario as an example, the process is as follows:
  • the MN sends a secondary station addition request to the SN where the candidate cell is located;
  • the SN where the candidate cell is located sends a secondary station addition request confirmation (ACK) to the MN, which may include the RRC reconfiguration message a;
  • ACK secondary station addition request confirmation
  • the MN sends the CPA configuration to the UE through the RRC reconfiguration message (ie, RRC reconfiguration message A).
  • the RRC reconfiguration message includes CPA configuration (ie, one or more RRC reconfiguration messages b) and associated execution conditions.
  • Each RRC reconfiguration message b contains an RRC reconfiguration message a from the candidate SN, optionally including MCG configuration;
  • the UE After receiving the RRC reconfiguration message from the MN, the UE replies to the MN with an RRC reconfiguration complete message.
  • the UE uses the Other RRC configurations except CPA configuration;
  • the UE also performs step 4a:
  • the UE begins to evaluate the execution conditions. Once the execution conditions of a candidate cell are met, the UE uses the configuration of the candidate cell selected in the RRC reconfiguration message and sends an RRC reconfiguration completion message to the MN.
  • the RRC reconfiguration completion message includes the selection The RRC reconfiguration completion message of the candidate cell and the selected candidate cell information;
  • the MN forwards the RRC reconfiguration completion message of the selected candidate cell to the SN where the selected candidate cell is located to notify the SN of successful completion of the reconfiguration process.
  • the MN can also send SN release request messages to other candidate SNs to cancel the CPA;
  • the UE performs the RACH process to the selected PSCell (the candidate cell selected above/the candidate cell that meets the execution conditions);
  • MN sends sequence number status transmission to the target SN
  • the MN and the target SN perform data forwarding
  • the CPC process is to execute the PSCell change process when the PSCell change conditions are met.
  • Figure 4B is a CPC flow chart provided by an embodiment of the present application, taking the CPC process triggered by the MN in the MR-DC scenario as an example:
  • the MN sends a secondary station addition request to the SN where the candidate cell is located (including the T-SN and candidate T-SN in the illustration);
  • the SN where the candidate cell is located sends a secondary station addition confirmation (ACK) to the MN, which may include the RRC reconfiguration message a;
  • ACK secondary station addition confirmation
  • the MN sends the CPC configuration to the UE through the RRC reconfiguration message (RRC reconfiguration message A).
  • the RRC reconfiguration message includes CPC configuration (ie, one or more RRC reconfiguration messages b) and associated execution conditions.
  • Each RRC reconfiguration message b contains an RRC reconfiguration message a from the candidate SN, optionally including MCG configuration;
  • the UE After receiving the RRC reconfiguration message from the MN, the UE replies to the MN with an RRC reconfiguration completion message.
  • the UE uses other RRC configurations except CPC in the RRC reconfiguration message;
  • 4a.MN informs the source SN (S-SN) that the CPC has been triggered through the Xn-U address indication (Address Indication);
  • the UE begins to evaluate the execution conditions. Once the execution conditions of a candidate cell are met, the UE uses the configuration of the candidate cell selected in the RRC reconfiguration message and sends an RRC reconfiguration completion message to the MN.
  • the RRC reconfiguration completion message includes the selection The RRC reconfiguration completion message of the candidate cell and the selected candidate cell information;
  • the MN informs the source SN (S-SN) to stop data transmission with the UE;
  • the MN notifies the target SN (T-SN) (the SN where the candidate cell selected above/the candidate cell that meets the execution conditions is located) to complete the RRC reconfiguration process of the target SN.
  • T-SN target SN
  • the MN can also send an SN release request message to other candidate SNs to Cancel CPC;
  • the UE performs the RACH procedure to the target SN;
  • the source SN sends the sequence number status transmission to the target SN through the MN;
  • the MN and target SN perform data forwarding.
  • Continuous CPAC In the above CPA and CPC processes, after completing the RACH process with the target cell, the UE will release the CPA/CPC configuration. Therefore, the UE cannot use CPAC configuration until the network is reconfigured or the network is restarted. In order to reduce the delay and signaling overhead of SCG changes, continuous CPAC (subsequent CPAC) allows CPAC to continue to be executed before network reconfiguration after SCG changes, that is, continuous CPAC.
  • Figure 4C is a schematic diagram of a continuous CPAC provided by an embodiment of the present application. As shown in Figure 4C, the scenario is described as follows:
  • the UE communicates with the primary station MN and cell 3 (C3) under the SN (there may be other SCells).
  • Cell 3 is the PSCell cell of the UE at this time;
  • the network configures the CPC configuration for the UE, in which the candidate cells include cells ⁇ 1, 2,...,9 ⁇ .
  • the CPC configuration may also include the configuration and execution conditions of each candidate cell;
  • the UE detects that the execution conditions of cell 5 (C5) are met, then the UE changes the PSCell cell to cell 5. After completing the connection with cell 5, the UE does not release the CPC configuration, but continues to maintain the CPC configuration and execute the CPC process.
  • the UE can continue to evaluate other candidate cells. When other candidate cells meet the execution conditions, the UE should trigger the PSCell change process. For example, in Figure 4C, the UE subsequently detects that cell 3 meets the execution conditions, so the UE switches the PSCell cell to cell 3 again.
  • L1/L2 switching is relative to the RRC switching in Figure 3 above, which refers to the MAC control unit (Control Element, CE) or downlink Downlink Control Information (DCI) completes the handover process, and its gain is to reduce access delay, thereby reducing service interruption and signaling overhead.
  • Figure 5A is the The application embodiment provides a schematic diagram of the process of L1/L2 handover between DUs, as shown in Figure 5A, including but not limited to the following steps:
  • the CU delivers the measurement configuration to the UE
  • the UE reports a measurement report to the CU according to the measurement configuration; the measurement report is used to assist the CU in making handover decisions and determining candidate cells;
  • the CU sends a handover request or a candidate cell addition request to the candidate DU (including the target DU);
  • the candidate DU (including the target DU) performs handover admission control according to the handover request and sends a HO request confirmation (ACK) to the CU;
  • the CU delivers L1/L2 preconfiguration information to the UE; the L1/L2 handover preconfiguration information may include multiple candidate cells and configuration information of multiple candidate cells. L1/L2 preconfiguration information can be included in the RRC reconfiguration message. After receiving the L1/L2 preconfiguration information, the UE continues to maintain data transmission with the source cell. The UE can perform measurements according to the network configuration for the network to make handover decisions;
  • the source DU issues an L1/L2 handover command to the UE.
  • the L1/L2 handover command is used to instruct the UE to switch to the target cell under the target DU;
  • the UE executes the RACH procedure and establishes a connection with the target cell. After receiving the L1/L2 handover command, the UE disconnects data transmission from the source cell;
  • the UE After the UE establishes a connection with the target DU, it performs data transmission with the target DU. The subsequent path conversion process between DU and CU will not be described again.
  • Conditional L1/L2 handover refers to the network issuing execution conditions for candidate cells of L1/L2 handover. When the execution conditions are met, the UE triggers L1/L2 handover.
  • Figure 5B is a schematic diagram of a conditional L1/L2 handover process for inter-DU handover provided by an embodiment of the present application. As shown in Figure 5B, it includes but is not limited to the following steps:
  • Steps 1 to 4 are exactly the same as steps 1 to 4 in Figure 5A and will not be described again.
  • the CU delivers L1/L2 preconfiguration information to the UE;
  • the L1/L2 handover preconfiguration information may include multiple candidate cells, as well as configuration information and associated execution conditions of multiple candidate cells. Only when the UE evaluates that the candidate cell meets the execution conditions, the UE triggers L1/L2 handover.
  • L1/L2 preconfiguration information can be included in the RRC reconfiguration message;
  • the UE stores L1/L2 preconfiguration information and begins to evaluate candidate cells; at this time, the UE continues data transmission with the source DU;
  • the candidate cell is used as the target cell, and the candidate DU where the target cell is located is used as the target DU;
  • the UE initiates a RACH process to the target DU and establishes a connection with the target DU.
  • the UE After the UE establishes a connection with the target DU, it performs data transmission with the target DU. The subsequent path conversion process between DU and CU will not be described again.
  • inter-DU L1/L2 handover including conditional L1/L2 handover
  • inter-DU L1/L2 handover including inter-DU conditional L1/L2 handover
  • the target cell and the source cell of the handover belong to the same DU.
  • the source DU and target DU in Figures 5A and 5B are replaced with the source cell and the target cell respectively.
  • conditional L1/L2 switching is a switching method in L1/L2 switching. Therefore, in the following embodiments, implementations that can be applied to L1/L2 switching can also be applied to conditional L1/L2 switching, and vice versa. No further details will be given in the following embodiments.
  • FIG. 5C is a schematic diagram of a continuous L1/L2 handover scenario provided by an embodiment of the present application.
  • the functions of the base station are completed by a combination of independent CUs and independent DUs.
  • a CU can be connected to one or more DUs, and each DU establishes a connection with the UE through its corresponding cell. in:
  • the UE communicates with cell 3 (C3) under the DU, and cell 3 is the PCell of the UE at this time;
  • the network delivers L1/L2 handover preconfiguration information to the UE.
  • the candidate cells in the preconfiguration information include cells ⁇ 1, 2,...,9 ⁇ , and the L1/L2 handover preconfiguration information includes each candidate cell.
  • Configuration optionally, may also include execution conditions associated with each candidate cell;
  • the UE detects that the execution conditions of cell 4 (C4) are met, or the UE receives a handover command from the base station instructing it to switch to cell 4 (C4), then the UE changes the PCell cell to cell 4.
  • the UE After completing an access to the target cell, the UE does not release the L1/L2 handover preconfiguration information, but continues to maintain the L1/L2 handover preconfiguration information.
  • the UE can continue to evaluate other candidate cells.
  • the UE should trigger the PCell change process.
  • the UE subsequently detects that cell 3 meets the execution conditions, so the UE switches the PCell cell to cell 3 again.
  • the UE receives a handover command from the base station instructing it to switch to cell 5 (C5), so the UE switches the PCell cell to cell 5 again.
  • the network may need to The device configures more candidate cells for subsequent handovers; (2) After completing a cell handover, the UE does not release the relevant candidate cell configuration information, but continues to maintain the configuration information in order to perform the next cell handover. These situations may cause the UE to be assigned or need to maintain more candidate cells. And as the UE moves, not all candidate cells are suitable for the UE to perform the cell handover process. Then if the UE measures all candidate cells Or evaluation to determine the target cell for handover, there will be problems such as unclear measurement cell range and low cell handover efficiency. At the same time, it may cause additional measurement power consumption.
  • Figure 6A is a flow chart of a cell measurement method provided by an embodiment of the present application. As shown in Figure 6A, the method includes the following steps:
  • the first network device determines first indication information.
  • the first indication information is used to indicate at least one candidate cell, and a first cell set corresponding to (or associated with) the first candidate cell in the at least one candidate cell.
  • the first cell The set includes at least one cell.
  • the first network device in the embodiment of this application refers to the interface device that provides control plane connection for the terminal device during the cell handover process.
  • the first network device may refer to the master base station (MN).
  • MN master base station
  • the first network device may refer to the convergence unit (CU) of the primary base station.
  • CU convergence unit
  • the first network device may also refer to the CU of the SN.
  • the terminal equipment (Terminal Equipment) in the embodiment of this application can also be called a terminal, user equipment (User Equipment, UE), mobile station (Mobile Station, MS), mobile terminal (Mobile Terminal, MT), etc.
  • the terminal device can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal device, or an industrial control (Industrial Control) ), wireless terminals in Self Driving, wireless terminals in Remote Medical Surgery, wireless terminals in Smart Grid, wireless terminals in Transportation Safety Terminals, wireless terminals in Smart City, wireless terminals in Smart Home, etc.
  • VR Virtual Reality
  • AR Augmented Reality
  • Industrial Control Industrial Control
  • the first network device may first obtain at least one candidate cell of the terminal device. Specifically, for example, it may determine the candidate cell based on one or more of network topology, network deployment, expected terminal movement direction, or statistical information, and may also be combined with reports from the terminal device.
  • the measurement report (including the layer 1 measurement report or the layer 3 measurement report) determines the candidate cell of the terminal device.
  • At least one candidate cell is the at least one candidate primary and secondary cell that adds a CPA to the conditional primary and secondary cells or changes the CPC of the conditional primary and secondary cells. That is to say, the embodiments of the present application can be applied to the CPA or CPC process, that is, to the scenarios corresponding to Figures 4A to 4C.
  • the MN may send an SN addition request to the candidate SN to determine whether the SN allows the cells under it to be used as candidate cells for addition or change.
  • the MN determines to use the confirmed cell under the SN as a candidate cell for addition or change.
  • the MN includes the cell confirmed under the SN in at least one candidate cell in the first indication information. For example, before the MN sends an SN addition request to the candidate SN, the SN may send an SN change request to the MN.
  • the MN may further determine the first cell set corresponding to any first candidate cell among the multiple candidate cells.
  • the MN may determine the first cell set corresponding to the first candidate cell based on one or more of the network topology, network deployment, expected terminal movement direction or statistical information, and may also determine the first cell set corresponding to the measurement report reported by the terminal device.
  • a first cell set corresponding to a candidate cell may be determined.
  • the SN addition request sent by the MN to the candidate SN may include the candidate SN list.
  • the candidate first SN may also send a request message to other candidate SNs to request to determine whether the other candidate SNs agree to include the cells of the other candidate SNs in the cells corresponding to the candidate first SN.
  • the first community set If other candidate SNs agree to include the cells of the other candidate SNs in the first cell set corresponding to the cells under the candidate first SN, then the candidate first SN sends the SN addition request ACK (or other message) to the MN, It may also include the candidate first SN or the first cell set associated with the candidate cells under the candidate first SN.
  • the MN may determine the first cell set corresponding to any first candidate cell among the plurality of candidate cells based on the first cell set sent by multiple candidate SNs.
  • At least one candidate cell is at least one candidate primary cell for L1/L2 handover or conditional L1/L2 handover. That is to say, the embodiments of the present application can also be applied to the L1/L2 handover or conditional L1/L2 handover process, that is, in the scenarios corresponding to Figures 5A to 5C.
  • the CU may send a request message to the candidate DU for determining whether the candidate DU allows the cell under the candidate DU to be used as a candidate cell for handover.
  • the CU determines to use the cell confirmed under the DU as the candidate cell for handover. As shown in steps 3 to 4 in Figures 5A to 5C.
  • the CU includes the cell confirmed under the DU in at least one candidate cell in the first indication information.
  • the CU may further determine a first cell set corresponding to any first candidate cell among the multiple candidate cells.
  • the CU may determine the first cell set corresponding to the first candidate cell based on one or more of the network topology, network deployment, expected terminal movement direction, information from the DU or statistical information, and may also combine the information reported by the terminal device The measurement report determines the first cell set corresponding to the first candidate cell.
  • the terminal device When at least one cell in the first cell set is the first candidate cell serving as the serving cell (serving PSCell or serving PCell) of the terminal device, the terminal device performs measurement or evaluation on the cell.
  • the serving cell of the terminal device is the first candidate cell, the terminal device only needs to measure the cells in the first cell set, or the terminal device only needs to evaluate whether the cells in the first cell set meet the execution conditions.
  • Table 1 for details, as follows:
  • Table 1 only shows the first cell set corresponding to some of the candidate cells among the plurality of candidate cells when they serve as first candidate cells. However, it can be inferred that when the first indication information can be used to indicate some or all of the candidate cells as the first candidate cells, their corresponding first cell set, Table 1 does not limit this.
  • the first cell set includes one or more cells in the at least one candidate cell except the first candidate cell, or the cells in the first cell set belong to the at least one candidate cell.
  • the first candidate cell is cell 3
  • its corresponding first cell set includes cell 1, cell 2, cell 4, cell 5 and cell 8.
  • These cells all have the first network device as the terminal.
  • the cells in the first cell set associated with the first candidate cell may be candidate cells that can be detected or have good signal quality when the terminal device is located in the coverage area of the first candidate cell.
  • the serving cell of the terminal device is the first candidate cell, the terminal device can only measure or evaluate some of the candidate cells based on the first cell set to achieve the purpose of saving power overhead.
  • the cells in the first cell set may include other cells than at least one candidate cell.
  • the first candidate cell when the first candidate cell is cell 4, its corresponding first cell set includes cell 3, cell 5 and cell 11, where cell 11 does not belong to at least one candidate cell configured for the terminal device. One, but cell 11 is adjacent to cell 4.
  • the first network device may indicate cell 11 as a cell in the first set of cells of cell 4.
  • the cells in the first cell set associated with the first candidate cell may be cells that can be detected or have good signal quality when the terminal device is located in the coverage area of the first candidate cell.
  • the terminal device can measure other neighboring cells with good signal quality near the first candidate cell based on the first cell set, thereby preventing the terminal device from missing high-quality neighboring cells and ensuring handover of the terminal device.
  • the quality of the target community is the first candidate cell.
  • the first indication information is used to indicate the first cell set corresponding to the first candidate cell in the at least one candidate cell, including: the first indication information may indicate the Physical Cell Identifier (PCI) of the at least one cell. ) to indicate the first cell set.
  • the network indicates the first cell set in the form of a PCI list.
  • the first indication information may indicate the first cell set by indicating the configuration identifier of the cell.
  • the first network device includes a configuration identifier (Config ID) in the preconfiguration information, and the configuration identifier is associated with a candidate cell configuration. Examples may also be associated with execution conditions of candidate cells. When the candidate cell satisfies the execution conditions, the terminal device can perform addition or handover of the candidate cell.
  • the preconfiguration information may be the CPA configuration in Figure 4A or the CPC configuration in Figure 4B or the L1/L2 preconfiguration information in Figures 5A to 5B.
  • the network may indicate the first cell set in the form of a configuration identification list.
  • the first indication information may also indicate the first set of cells corresponding to the first candidate cell through bit mapping indication information.
  • bits corresponding to candidate cells are used to indicate the first cell set.
  • the cells in the first cell set belong to multiple candidate cells configured for the terminal device on the network side.
  • FIG. 6B is a correspondence diagram between a bitmap and a candidate cell provided by an embodiment of the present application.
  • the candidate cells are cells 1 to 9 (C1 to C9), which respectively correspond to 9 bits in the bitmap.
  • the bitmap corresponding to cell 2 is 001110011, indicating the first cell corresponding to cell 2.
  • the set includes cells ⁇ 3,4,5,8,9 ⁇ .
  • bits corresponding to the maximum number of candidate cells that can be configured by the network side for the terminal device are used to indicate the cells in the first cell set.
  • the maximum number of candidate cells that can be configured for terminal equipment is 16, corresponding to cells 1 to 16.
  • the first indication information of cell 3 is 1101 0011 1000 0000, where cell 1, cell 2, cell 3, and cell 7,
  • the bit indicators corresponding to cell 8 and cell 9 are "1", indicating that these cells are cells in the first cell set of cell 3.
  • the other bit indicators are "0", indicating that these cells are not the first cell of cell 3.
  • the cells in the collection are used to indicate the cells in the first cell set.
  • the first indication information may also indicate the cells in the first cell set through other methods.
  • the above embodiments are only partial examples and should not cause specific limitations on the indication method of the first indication information.
  • the first indication information is used to indicate at least one candidate cell, and the first cell set corresponding to the first candidate cell in the at least one candidate cell. It should be clear that at least one candidate cell and the first cell set corresponding to the first candidate cell may be indicated in the same message through the first indication information, or may be indicated in different messages.
  • At least one candidate cell may be indicated in the first RRC reconfiguration message sent by the MN to the terminal device.
  • the MN sends the first RRC reconfiguration message to the terminal device, it includes the RRC reconfiguration message of the SN, that is, the CPAC configuration information, and accordingly the candidate primary and secondary cells may be updated. Therefore, at least one candidate primary and secondary cell of the terminal device may also be indicated in the CPAC configuration information, so that the terminal device can perform SN switching. That is, the first indication information may be sent in the first RRC reconfiguration message, and is used to simultaneously indicate at least one candidate primary and secondary cell and the first set of cells corresponding to the first candidate cell.
  • the first indication information may be sent in the first RRC reconfiguration message and the second RRC reconfiguration message (including CPAC configuration information, and the first indication information may be carried in the CPAC configuration information).
  • the former is used to indicate at least one candidate.
  • Primary and secondary cells, the latter is used to indicate the first set of cells corresponding to the first candidate cell.
  • At least one candidate cell may be indicated in the third RRC reconfiguration message delivered by the CU to the terminal device.
  • the CU may update the candidate primary cell based on the measurement reports periodically reported by the terminal equipment. Therefore, when the CU sends the L1/L2 preconfiguration information to the EU through the third RRC reconfiguration message, it may indicate the candidate DU corresponding to At least one candidate primary cell is used for terminal equipment to perform DU handover. That is to say, the first indication information may be sent in the third RRC reconfiguration message, and is used to simultaneously indicate at least one candidate primary cell and the first set of cells corresponding to the first candidate cell.
  • the first indication information may be sent in the third RRC reconfiguration message and the fourth RRC reconfiguration message (including L1/L2 preconfiguration information, and the first indication information may be carried in the L1/L2 configuration information).
  • the former is used To indicate at least one candidate primary cell, the latter is used to indicate a first cell set corresponding to the first candidate cell.
  • the first indication information is sent in the same message to simultaneously indicate at least one candidate cell and the first set of cells corresponding to the first candidate cell, so that the first set of candidate cells and the first candidate cell can be completed at once.
  • the indication of the cell set facilitates the terminal equipment to ensure the consistency and integrity of multiple candidate cells and the first candidate cell.
  • the first indication information is sent through different messages to respectively indicate at least one candidate cell and the first set of cells corresponding to the first candidate cell. And usually, at least one candidate cell is indicated first, and then the first cell set corresponding to the first candidate cell is indicated.
  • the first network device sends the first instruction information.
  • the first indication information may be included in preconfiguration information, and the preconfiguration information may be the CPA configuration in FIG. 4A or the CPC configuration in FIG. 4B or the L1/L2 preconfiguration information in FIGS. 5A to 5B. That is, the first network device may send the first indication information through step 3 in FIGS. 4A to 4C or step 5 in FIGS. 5A to 5C.
  • the terminal device receives the first indication information, and according to the first indication information, the terminal device measures or evaluates the cells in the first cell set, where the serving cell of the terminal device is the first candidate cell. That is, the first indication information is used to indicate the cell that the terminal equipment measures (or evaluates) when the serving cell of the terminal equipment is the first candidate cell.
  • the first network device After determining the first indication information, the first network device sends the first indication information to the terminal device.
  • the terminal equipment receives the first indication information and performs a cell measurement or evaluation process according to the first indication information.
  • the terminal device performing cell measurement according to the first indication information may correspond to step 5 in Figure 5A.
  • the cell evaluation performed by the terminal device according to the first indication information may correspond to step 4a in FIG. 4A or step 5 in FIG. 4B or step 6 in FIG. 5B.
  • the first candidate cell is the serving cell of the terminal device, which means that the first candidate cell is the primary and secondary serving cell of the terminal device.
  • the terminal device evaluates whether the cells in the first cell set satisfy the execution condition based on the first indication information.
  • the execution condition may be included in the message where the first instruction information is located.
  • the terminal equipment receives the first indication information as shown in Table 1, and when the primary and secondary serving cells of the terminal equipment are cell 5, the terminal equipment performs operations on the cells in the first cell set ⁇ 3, 4, 6, 9 ⁇ . Measure and evaluate to determine whether any of these cells meets the execution conditions. If there is, the primary and secondary serving cells are switched, or the SN switching is completed.
  • the first candidate cell is the serving cell of the terminal device, which means that the first candidate cell is the primary serving cell of the terminal device (in some cases, it can also be the primary and secondary serving cell of the terminal device).
  • the serving cell is the first candidate cell
  • the terminal device measures the cells in the first cell set based on the first indication information.
  • the terminal device evaluates whether the cells in the first cell set satisfy the execution condition based on the first indication information.
  • the terminal equipment receives the first indication information as shown in Table 1, and when the primary serving cell (or primary and secondary serving cells) of the terminal equipment is cell 5, the terminal equipment sets the first cell to the cells ⁇ 3, 4, 6, 9 ⁇ for measurement or evaluation. If the terminal equipment evaluates the cells in the first cell set, it determines whether any of these cells satisfies the execution condition. If so, the primary serving cell (or primary and secondary serving cells) is switched.
  • the terminal device measuring or evaluating the cells in the first cell set does not mean that the terminal device can definitely detect all cells in the first cell set.
  • the terminal device only attempts to measure the cells in the first cell set. For example, when the serving cell of the terminal device is the first candidate cell, there is no need to measure or evaluate other cells outside the first cell set.
  • the first indication information is obtained by the first network device, and the first indication information is used to indicate at least one candidate cells, and a first set of cells corresponding to a first candidate cell among at least one candidate cell.
  • the terminal equipment receives the first indication information and performs cell measurement according to the first cell set indicated by the first indication information.
  • the embodiments of the present application associate the cell where the terminal device performs measurement and evaluation with the serving cell, so that the measurement and evaluation cell range changes with the change of the serving cell, improving the efficiency of cell measurement and evaluation, and thereby improving the efficiency of the cell handover process.
  • Figure 7A is a flow chart of a communication method provided by an embodiment of the present application. As shown in Figure 7A, the method includes the following steps:
  • the first network device determines the configuration information of the candidate cell.
  • the first network device refers to an interface device that provides control plane connection for terminal devices during cell handover communication.
  • the first network device may refer to the MN, and in L1/L2 handover or conditional L1/L2 handover, the first network device may refer to the CU of the master base station. In some possible cases, the first network device may also refer to the CU of the SN.
  • the first network device may determine the configuration information of the candidate cell, such as the candidate cell identifier, the access condition of the candidate cell, the measurement configuration corresponding to the candidate cell, etc.
  • the first network device may determine the configuration information of the candidate cell based on the network topology, network deployment, and cell parameters, such as the frequency band where the cell is located.
  • the first network device sends a first message to the terminal device, where the first message includes the configuration information of the candidate cell.
  • the first network device After determining the configuration information of the candidate cell, the first network device sends the configuration information of the candidate cell to the terminal device through the first message, so that the terminal device can measure or evaluate the candidate cell.
  • the configuration information of the candidate cell may be specifically included in the CPA configuration in Figure 4A or the CPC configuration in Figure 4B or the L1/L2 preconfiguration information in Figures 5A to 5B.
  • the terminal device receives the first message. If the first condition is met, the terminal device sends a second message to the first network device. The second message is used to request to update the configuration information of the candidate cell.
  • the first condition is a condition that the signal quality of the serving cell or the candidate cell needs to meet.
  • the first condition includes at least one of the following: the signal quality of the serving cell is less than or equal to the first threshold; or the number of candidate cells that can be detected is less than or equal to the first quantity; or the signal quality of the candidate cell is less than or equal to the second threshold.
  • Figure 7B is a schematic diagram of the moving position of the terminal device provided by an embodiment of the present application.
  • the first network device delivers the configuration information of candidate cells to the terminal device based on the current serving cell C3 of the terminal device.
  • the candidate cells include C ⁇ 1,2,4,...,8 ⁇ ; when the terminal device moves to position 2 , the configuration information of the candidate cell is still applicable.
  • some distant candidate cells such as cells ⁇ 2, 5, 7 ⁇ are no longer cells that the terminal device can measure. These cells should no longer be used as candidate cells for the terminal device.
  • the terminal equipment may have a new candidate cell, such as cell 9. Then the configuration information of the candidate cell previously received by the terminal device is no longer applicable.
  • the first network device may not necessarily be able to update the configuration information of the candidate cell in time, which may cause the terminal device to fail in cell switching or have poor communication quality.
  • the terminal device may trigger sending a second message to the first network device for requesting to update the configuration information of the candidate cell or for requesting to update the candidate cell.
  • Specific triggering conditions include the first condition, and the first condition may specifically include one or more of the following:
  • the signal quality of the serving cell is less than or equal to the first threshold.
  • the first threshold is, for example, the threshold of RSRP, specifically -110dBm (decibel milliwatt).
  • the first threshold is network configured or predefined, for example, the first threshold is included in the first message.
  • the number of candidate cells that the terminal device can detect is less than or equal to the first number.
  • the terminal device since the configuration information of the candidate cells is delivered by the first network device based on the current serving cell C3, the terminal device can detect more candidate cells when it is in position 1.
  • the terminal device moves to position 2 and further moves to position 3, the number of candidate cells that the terminal device can detect becomes less and less because the signal coverage range of the candidate cells is getting farther and farther. Therefore, when the number of candidate cells that the terminal device can detect is less than or equal to the first number, the terminal device may be triggered to send the second message to the first network device.
  • the first number is configured or predefined for the network, for example the first The quantity is included in the first message.
  • the signal quality of the candidate cell is less than or equal to the second threshold. This may mean that the signal quality of all candidate cells configured by the first network device for the terminal device is less than or equal to the second threshold, or it may mean that the signal quality of the third number of candidate cells in the candidate cells is less than or equal to the second threshold.
  • the second threshold and the third quantity may be network configured or predefined, for example, the second threshold and/or the third quantity are included in the first message. At this time, it means that the quality of all candidate cells or many candidate cells is poor, and the terminal device cannot perform effective cell switching, and the terminal device can be triggered to send the second message to the first network device.
  • the above three conditions can be used individually to trigger the terminal device to send the second message. It can also be combined to trigger the terminal device to send the second message. For example, when the signal quality of the serving cell is less than or equal to the first threshold and the number of candidate cells that the terminal device can detect is less than or equal to the first number, the terminal device is triggered to send the second message.
  • the second message may include candidate cell identities that the terminal device recommends deleting or adding.
  • the second message may include the signal quality of some candidate cells.
  • the configuration information of the candidate cell adds a CPA to the conditional primary and secondary cells or changes the CPC configuration information of the conditional primary and secondary cells
  • the second message is used to update the configuration information of the CPA or CPC. For example, it is used to request the network to add or reduce candidate cells.
  • the first network device sends the configuration information of the candidate primary and secondary cells to the terminal device through the CPAC configuration information (i.e., the configuration information of the CPA or the configuration information of the CPC). After receiving it, the terminal device performs corresponding cell measurement and evaluation to facilitate primary and secondary cells. Cell switching. When one or more of the above three conditions are met, the terminal device is triggered to send a second message to the first network device for updating the configuration information of the CPAC.
  • the CPAC configuration information i.e., the configuration information of the CPA or the configuration information of the CPC.
  • the first network device can re-determine the CPAC configuration information, for example, based on the second message, network topology, network deployment, current location information of the terminal device, and whether the own cell re-reported by the SN can be used as a candidate cell. Wait for the information to determine the new CPAC configuration information.
  • the configuration information of the candidate cell is the configuration information of the candidate cell for layer 1/layer 2 handover
  • the first message is used to request to update the configuration information of layer 1/layer 2 handover. For example, it is used to request the network to add or reduce candidate cells.
  • the embodiment of the present application can be applied to the L1/L2 switching process shown in Figures 5A to 5C.
  • the first network device sends the configuration information of the candidate primary cell (or candidate primary and secondary cells) to the terminal device through the L1/L2 preconfiguration information. After receiving it, the terminal device performs corresponding cell measurement or evaluation to perform cell switching. When one or more of the above three conditions are met, the terminal device is triggered to send a second message to the first network device for updating the preconfiguration information of L1/L2. After receiving the second message, the first network device can re-determine the L1/L2 configuration information, for example, based on the second message, network topology, network deployment, current location information of the terminal device, measurement reports reported by the terminal device, etc. New L1/L2 configuration information.
  • the terminal device Before receiving the updated configuration information of the candidate cell delivered by the network, the terminal device continues to use or maintain the original candidate cell configuration information.
  • the terminal device when the first condition is met, the terminal device can be triggered to send a second message to the first network device for requesting to update the configuration information of the candidate cell.
  • the terminal device actively requests the network device to update the configuration information of the candidate cell, so that the terminal device can instantly obtain the most accurate configuration information of the candidate cell in order to perform cell switching. This improves the probability of successful cell handover and reduces the cell handover delay caused by the inability to obtain valid configuration information of candidate cells in time.
  • both the first indication information and the configuration information of the candidate cell are sent to the terminal device, and the terminal device performs measurement or evaluation based on the first indication information.
  • the terminal device sends a second message, using In addition to requesting to update the configuration information of the candidate cell, it is also possible to request to update the content of the first indication information.
  • At least one candidate cell corresponding to the terminal device, and the first cell set corresponding to the first candidate cell among the at least one candidate cells, are also updated as the configuration information of the candidate cells is updated.
  • the terminal device can also actively send a measurement report to the network device.
  • Figure 8 is a flow chart of a communication method provided by an embodiment of the present application. As shown in Figure 8, the method includes the following steps:
  • the first network device determines the configuration information of the candidate cell.
  • the first network device sends a first message, where the first message includes configuration information of the candidate cell.
  • step 301 and step 302 please refer to the foregoing description of step 201 and step 202, and will not be described again here.
  • the terminal device receives the first message, and if the second condition is met, triggers sending a measurement report to the first network device, where the measurement report includes the signal quality of the candidate cell.
  • the second condition is a condition that the signal quality of the serving cell or candidate cell needs to meet, for example
  • the second condition includes at least one of the following: the signal quality of the serving cell is less than or equal to the second threshold; or the number of candidate cells that the terminal device can detect is less than or equal to the second number; or the signal quality of the candidate cells is less than or equal to the third threshold. threshold; or the serving cell is switched to the first cell, and the first cell is one of the second cell set; or the signal quality of one or more cells except the candidate cell is greater than or equal to the fourth threshold.
  • the configuration information of the candidate cell sent by the first network device may no longer be applicable.
  • the terminal device may send a measurement report to the first network device, where the measurement report includes the signal quality of part or all of the candidate cells, and may also include the signal quality of cells other than the candidate cells.
  • the first network device can update the configuration information of the candidate cell according to the measurement report. Specifically, for example, the execution conditions of the candidate cells are updated, or the candidate cells are updated.
  • the second condition that triggers the terminal device to send a measurement report may include one or more of the following:
  • the signal quality of the serving cell is less than or equal to the second threshold.
  • the number of candidate cells that can be detected is less than or equal to the second number.
  • conditions (1) to (3) please refer to the related descriptions of the embodiments in FIGS. 7A to 7B .
  • conditions (1) to (3) in Figures 7A to 7B are used to trigger the terminal device to send the second message to the first network device.
  • Conditions (1) to (3) in the embodiment of the present application are used to trigger the terminal device to send a measurement report to the first network device.
  • the serving cell is switched to the first cell, and the first cell is one of the second cell set. That is to say, the terminal equipment switches to the first cell in the preset second cell set.
  • the cells in the second cell set belong to candidate cells.
  • the cells in the second cell set are C ⁇ 8,9 ⁇ in Figure 7B.
  • the cells in the second cell set may also be cells outside the candidate cells, for example, when the network instructs the terminal device to switch to a cell outside the candidate cells.
  • Switching from the serving cell to the first cell can indicate that the terminal device has moved to a location where the signal quality of the candidate cell is poor, and can trigger the terminal device to send a measurement report to the first network device to provide decision-making reference for the first network device, such as whether to decide whether Update and how to update the configuration information of the candidate cell.
  • the first cell or the second set of cells may be network configured, for example included in the first message.
  • the signal quality of one or more cells other than the candidate cell is greater than or equal to the fourth threshold.
  • the terminal equipment measures that the signal quality of one cell or a fourth number of cells other than the candidate cell is greater than or equal to a fourth threshold, where the fourth number and the fourth threshold may be network configured or predefined, for example, included in the fourth threshold.
  • the terminal device can trigger sending a measurement report to the first network device, so that the terminal device can determine whether to update the configuration information of the candidate cells, including adding the one or more cells as candidate cells of the terminal device.
  • the above conditions (1) to (5) may be used individually to trigger the terminal device to send a measurement report to the first network device, or may be used in combination to trigger the terminal device to send a measurement report to the first network device.
  • condition (1), condition (3) and condition (5) are met at the same time, it means that the signal quality of the current serving cell of the terminal device is poor, and the signal quality of the candidate cells is very poor, but there are other cells with better signal quality.
  • the terminal device can be triggered to send a measurement report to the first network device, so that the first network device can decide whether to update and how to update the configuration information of the candidate cell with reference.
  • the terminal device when the second condition is met, can be triggered to send a measurement report to the first network device for the first network device to refer to how to update the configuration information of the candidate cell.
  • the terminal device actively sends the measurement report to the network device, which enables the network device to determine a solution for updating the configuration information of the candidate cell faster and more accurately.
  • the success rate of the cell handover process is improved.
  • the embodiments of the present application can be implemented alone or in combination with the aforementioned embodiments described in FIGS. 7A to 7B . Specifically, it is assumed that after receiving the configuration information of the candidate cell, the terminal device determines that the terminal device satisfies one or more of the conditions (1) to (3) in Figures 7A to 7B, and at the same time satisfies the condition () in the embodiment of the present application.
  • condition (5) (wherein conditions (1) to (3) in Figures 7A to 7B and conditions (1) to (3) in the embodiment of the present application may correspond to the same threshold or quantity of conditions, or conditions corresponding to different thresholds or quantities), then the terminal device is triggered to send a second message and a measurement report to the first network device to request an update of the configuration information of the candidate cell, and the terminal device can send a second message and a measurement report to the network device. Send a measurement report so that the network device determines specifically how to update the configuration information of the candidate cell based on the measurement report.
  • the embodiment corresponding to Figure 8 can be combined with the aforementioned embodiment corresponding to Figures 6A to 6B.
  • the specific combination method can be to trigger the terminal device to send a measurement report to the first network device, and the first network device determines the first indication based on the measurement report. information.
  • the embodiments corresponding to Figures 6A to 6B, the embodiments to Figures 7A to 7B, and the embodiments to Figure 8 can be combined.
  • the specific combination method is as described above and will not be described again here.
  • the terminal device obtains the configuration information of the candidate cell for the received configuration information of the candidate cell.
  • steps 201 to 202 in the aforementioned embodiment.
  • invalidating or releasing can also be performed.
  • Figure 9 is a flow chart of a communication method provided by an embodiment of the present application. The method includes the following steps:
  • the first network device sends a third message to the terminal device, where the third message is used to instruct the terminal device to switch to the target cell, where the target cell does not belong to the candidate cell.
  • the third message is, for example, an RRC reconfiguration message or a handover command.
  • the terminal device receives the third message sent by the first network device, switches to the target cell indicated by the third message, and treats the configuration information of the candidate cell as valid or saves it.
  • the terminal device switches to the target cell indicated by the third message, and determines whether the configuration information of the candidate cell is valid or invalid according to the instruction information A from the first network device.
  • step 402A and step 402B are optional steps.
  • the indication information A may be included in the third message.
  • step 400 the first network device sends the indication information A to the terminal device.
  • the terminal device may receive instruction information sent by the first network device to instruct the terminal device to switch from the current serving cell (source cell) to the target cell.
  • the serving cell may be PSCell.
  • the serving cell may be PCell.
  • the first network device may regard the cell as the target cell and instruct the terminal device through a third message.
  • the terminal device can complete access to the target cell based on the configuration information of the candidate cell.
  • the configuration information of the candidate cell previously received by the terminal device is considered to be still valid, so it can be saved or maintained.
  • the terminal device cannot access the target cell based on the previously received configuration information of the candidate cell.
  • the terminal device may complete the access based on the configuration information newly sent by the first network device, for example, through the third network device.
  • the configuration in the three messages completes the switch. If the target cell does not belong to the candidate cell, it means that the location of the terminal equipment may have moved, or the cell signal has changed, and the previous configuration information of the candidate cell is no longer suitable for the cell handover of the terminal equipment. Then, the operations that the terminal equipment can perform at this time include: (1) Treat the configuration information of the candidate cell as valid or save it.
  • This situation may be that the terminal equipment believes that although the current configuration information of the candidate cell is not suitable for the target cell, it can wait for the terminal equipment position to continue to move and the candidate cell parameters continue to change, and then the configuration information of the candidate cell is re-determined and the target cell is suitable. match. Therefore, the configuration information of the candidate cell is still considered valid or saved. This can reduce the probability that the first network device resends the configuration information of the same candidate cell to the terminal device, save signaling overhead, and reduce delay. (2) Determine whether the configuration information of the candidate cell is valid or invalid according to the instruction information from the first network device. For example, the first indication information is included in the third message or the message containing the candidate cell configuration.
  • the network device (for example, CU) can determine whether the terminal device can still use the configuration information of the candidate cell after handover based on the target cell, network topology, etc.
  • the first network device may use indication information to explicitly indicate whether the previously sent configuration information of the candidate cell is valid. Then the terminal device may determine whether the configuration information of the candidate cell is valid or invalid according to the indication information of the first network device. Further, for valid candidates The configuration information of the cell is saved, and the configuration information of the invalid candidate cell can be released.
  • the terminal device when certain conditions are met, specifically including when the target cell indicated by the network device is a cell other than the candidate cell, it is different from the usual situation where the terminal device releases the received candidate cell after performing cell handover.
  • configuration information it can be determined that the configuration information of the candidate cell is valid. This reduces the signaling overhead of candidate cell configuration information and saves the delay in receiving reconfiguration.
  • the terminal device may also determine whether the configuration information of the candidate cell is valid or invalid based on the indication information sent by the network device. In this way, the configuration information of the candidate cells is processed more flexibly, avoiding communication redundancy or data storage redundancy while saving signaling overhead and reducing latency.
  • Figure 10 is a flow chart of another communication method provided by an embodiment of the present application, as shown in Figure 10 As shown in 10, this method includes the following steps:
  • the first network device sends the configuration information of the candidate cell to the terminal device;
  • the terminal device triggers the radio resource management RRC reconstruction process, and the cell selected by the RRC reconstruction process belongs to the first network device;
  • the terminal device if the terminal device detects that a radio link failure (RLF) occurs in the connection with the MN, the terminal device will trigger the RRC reconstruction process. That is, the terminal device performs cell selection and attempts to restore the connection on the selected cell.
  • RLF radio link failure
  • the cell selected in the RRC reestablishment process may be the original serving cell (including PCell or PSCell) or other cells belonging to the first network device.
  • the first network device is the base station or CU where the original serving cell is located.
  • the RRC reconstruction process may also select a cell that does not belong to the first network device.
  • the terminal device selects a cell based on the cell signal quality, so the selected cell may not belong to the first network device.
  • the terminal device regards the configuration information of the candidate cell as valid or saves it.
  • the terminal device treats the configuration information of the candidate cell as valid or saves it.
  • the configuration information of the candidate cell includes the CPAC configuration of the CPAC process, or the L1/L2 and configuration information in the L1/L2 handover process.
  • the configuration information of the candidate cell can be the CPA configuration in Figure 4A or the CPC in Figure 4B configuration or L1/L2 preconfiguration information in Figures 5A to 5B. This process can reduce the communication overhead caused by transmitting the configuration information of the same candidate cell again and save the reconfiguration delay.
  • the terminal device treats the configuration information of the candidate cell as invalid or releases it.
  • the configuration information of the candidate cell previously received by the terminal device may no longer adapt to the current cell handover process.
  • the terminal device releases, discards or treats the configuration information of the candidate cells as invalid, which can reduce the overhead of the terminal device in storing or maintaining the configuration information of the unsuitable candidate cells and prevent the terminal device from using inappropriate configuration information.
  • the communication device 600 includes a transceiver module 601 and a processing module 602 .
  • the communication device 600 can be used to implement the functions of the terminal device or network device in the method embodiments shown in FIG. 6A, FIG. 7A, FIG. 8, FIG. 9, and FIG. 10.
  • Transceiver module 601 configured to receive first indication information, the first indication information being used to indicate at least one candidate cell, and a first cell set corresponding to the first candidate cell in the at least one candidate cell, the first cell set including at least one cell ;
  • Processing module 602 configured for the terminal device to measure the cells in the first cell set according to the first indication information, where the serving cell of the terminal device is the first candidate cell.
  • Processing module 602 configured to determine first indication information, the first indication information is used to indicate at least one candidate cell, and a first cell set corresponding to the first candidate cell in the at least one candidate cell, the first cell set including at least one cell ;
  • Transceiver module 601 used to send first indication information.
  • Transceiver module 601 configured to receive a first message, where the first message includes configuration information of the candidate cell;
  • the processing module 602 is configured to trigger the transceiver module 601 to send a second message to the first network device when it is determined that the first condition is met.
  • the second message is used to request to update the configuration information of the candidate cell.
  • the first condition includes at least the following: One: the signal quality of the serving cell is less than or equal to the first threshold; or the number of candidate cells that can finally be detected is less than or equal to the first number; or the signal quality of the candidate cells is less than or equal to the second threshold.
  • Processing module 602 used to determine the configuration information of the candidate cell
  • the transceiving module 601 is used to send a first message, the first message includes the configuration information of the candidate cell; the receiving module is used to receive the first message or the measurement report, the first message is used to request to update the configuration information of the candidate cell, the measurement report includes the candidate cell configuration information.
  • the signal quality of the cell is used to send a first message, the first message includes the configuration information of the candidate cell; the receiving module is used to receive the first message or the measurement report, the first message is used to request to update the configuration information of the candidate cell, the measurement report includes the candidate cell configuration information.
  • the signal quality of the cell is used to send a first message, the first message includes the configuration information of the candidate cell;
  • Transceiver module 601 configured to receive a first message, where the first message includes configuration information of the candidate cell;
  • the processing module 602 is configured to trigger the transceiver module 601 to send a measurement report to the first network device if it is determined that the second condition is met, where the measurement report includes the signal quality of the candidate cell, and the second condition includes At least one of the following: the signal quality of the serving cell is less than or equal to the second threshold; or the number of the candidate cells that can be detected is less than or equal to the second number; or the signal quality of the candidate cells is less than or equal to the third threshold; Or the serving cell is switched to a first cell, and the first cell is one of the first cell set; or the signal quality of one or more cells except the candidate cell is greater than or equal to the fourth threshold.
  • the processing module 602 is used to determine the configuration information of the candidate cell.
  • Transceiver module 601 configured to send a first message, the first message including the configuration information of the candidate cell; and to receive a first message or a measurement report, the first message being used to request to update the configuration of the candidate cell.
  • Information, the measurement report includes the signal quality of the candidate cell.
  • the transceiver module 601 is used to receive the third message sent by the first network device.
  • the processing module 602 is used to determine the configuration information of the candidate cell, and switch to the target cell indicated by the third message, and treat the configuration information of the candidate cell as valid or save; or to switch to the target cell indicated by the third message, according to The indication information A from the first network device determines whether the configuration information of the candidate cell is valid or invalid.
  • the processing module 602 is configured to determine a third message, where the third message is used to instruct the terminal device to switch to the target cell, where the target cell does not belong to the candidate cell.
  • Transceiver module 601 used to send the third message.
  • Transceiver module 601 used to receive configuration information of candidate cells
  • the processing module 602 is configured to trigger the radio resource management RRC reconstruction process, where the cell selected in the RRC reconstruction process belongs to the first network device, and to regard the configuration information of the candidate cell as valid or save it.
  • the processing module 602 is used to determine the configuration information of the candidate cell.
  • the transceiving module 601 is used to send the configuration information of the candidate cell to the terminal device.
  • transceiver module 601 For a more detailed description of the above-mentioned transceiver module 601 and processing module 602, reference may be made to the relevant descriptions in the above-mentioned method embodiments, which will not be described again here.
  • Figure 12 shows a schematic diagram of the hardware structure of a communication device in an embodiment of the present application.
  • the structure of the device in Figure 11 can refer to the structure shown in Figure 12 .
  • the communication device 1000 includes: a processor 111 and a transceiver 112, and the processor 111 and the transceiver 112 are electrically coupled;
  • the processor 111 is configured to execute some or all of the computer program instructions in the memory. When the part or all of the computer program instructions are executed, the device performs the method described in any of the above embodiments.
  • the transceiver 112 is used to communicate with other devices; for example, receiving a message from the first network element, the message including the identifier of the multicast and/or broadcast service, and the key and/or key of the multicast and/or broadcast service. Key identification for multicast and/or broadcast services.
  • a memory 113 is also included for storing computer program instructions.
  • the memory 113 (memory #1) is located in the device, and the memory 113 (memory #2) is integrated with the processor 111. together, or the memory 113 (memory #3) is located outside the device.
  • the communication device 1000 shown in FIG. 12 may be a chip or a circuit.
  • it may be a chip or circuit provided in a terminal device or a communication device.
  • the above-mentioned transceiver 112 may also be a communication interface.
  • a transceiver includes a receiver and a transmitter.
  • the communication device 1000 may also include a bus system.
  • the processor 111, the memory 113, and the transceiver 112 are connected through a bus system.
  • the processor 111 is used to execute instructions stored in the memory 113 to control the transceiver to receive signals and send signals to complete the first implementation method involved in this application. device or steps for a second device.
  • the memory 113 may be integrated in the processor 111 or may be provided separately from the processor 111 .
  • the function of the transceiver 112 may be implemented through a transceiver circuit or a dedicated transceiver chip.
  • the processor 111 may be implemented by a dedicated processing chip, a processing circuit, a processor or a general-purpose chip.
  • the processor can be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP.
  • the processor may further include a hardware chip or other general-purpose processor.
  • the above-mentioned hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL) and other programmable logic devices , discrete gate or transistor logic devices, discrete hardware components, etc. or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL general array logic
  • other programmable logic devices discrete gate or transistor logic devices, discrete hardware components, etc. or any combination thereof.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the memory mentioned in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • Enhanced SDRAM, ESDRAM enhanced synchronous dynamic random access memory
  • Synchlink DRAM, SLDRAM synchronous link dynamic random access memory
  • Direct Rambus RAM Direct Rambus RAM
  • Embodiments of the present application provide a computer storage medium that stores a computer program.
  • the computer program includes methods for executing the methods applied to terminal devices in the above embodiments.
  • An embodiment of the present application provides a computer storage medium that stores a computer program.
  • the computer program includes a method for executing the method applied to the first network device in the above embodiment.
  • Embodiments of the present application provide a computer program product containing instructions that, when run on a computer, cause the computer to execute the method applied to the terminal device in the above embodiments.
  • Embodiments of the present application provide a computer program product containing instructions that, when run on a computer, cause the computer to execute the method applied to the first network device in the above embodiments.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code. .

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Abstract

本申请公开了一种小区测量方法及装置，其中方法包括：第一网络设备确定第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区，第一网络设备发送第一指示信息；终端设备接收第一指示信息，根据第一指示信息，终端设备测量第一小区集合中的小区，其中，终端设备的服务小区为第一候选小区，采用此方式，明确了终端设备测量评估的小区范围，提升了小区切换的效率和成功率。

Description

小区测量方法及装置
本申请要求于2022年07月25日提交中国国家知识产权局、申请号为202210880569.6、发明名称为“小区测量方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种小区测量方法及装置。
背景技术
在无线通信网络中，很多场景下需要进行连续的小区切换。例如条件主辅小区添加或变更(Conditional PSCell Addition/Change，CPAC)，条件层1或层2切换(Conditional L1/L2 Handover)，其中层1为物理层，层2包括媒体接入控制(Media Access Control,MAC)层、无线链路控制(Radio Link Control,RLC)层和分组数据汇聚控制(Packet Data Convergence Control,PDCP)层。在CPAC或条件L1/L2切换时，终端设备在完成一次CPAC或一次条件L1/L2切换后，可能并不释放CPAC配置或L1/L2预配置信息，而是继续维护CPAC配置或L1/L2预配置信息。因此一些情况下，网络可能需要为终端设备配置更多的候选小区，以供进行连续的小区切换。随着终端设备的移动，并不是所有候选小区都适合终端设备进行小区切换过程。那么如果终端设备对所有候选小区都进行测量或评估以确定进行切换的目标小区，将存在测量小区范围不明确，切换小区效率低和增加不必要的功率开销等问题。
发明内容
本申请实施例提供了一种小区测量方法及装置，用以明确终端设备测量评估的小区范围，提升了小区切换的效率和成功率。
第一方面，提供了一种小区测量方法，该方法的执行主体可以是终端设备，也可以是应用于终端设备中的芯片。下面以执行主体是终端设备为例进行描述。终端设备接收第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区。所述终端设备根据第一指示信息，测量第一小区集合中的小区，其中，所述终端设备的服务小区为第一候选小区。
可见，在本申请实施例中，获取第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合。终端设备根据第一指示信息指示的第一小区集合进行小区测量。这个过程中，第一方面，通过确定服务小区对应的第一小区集合，准确确定终端设备在进行小区切换时测量评估的小区范围，提升切换效率。另一方面能够使得UE测量评估的小区不限定在为终端设备配置的至少一个候选小区中，提升终端设备切换小区的成功率。
在一种可能的设计中，至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
本申请实施例中，将该小区测量方法应用于条件主辅小区添加CPA或条件主辅小区变更CPC场景，使得在CPA或CPC场景中，特别是在有连续切换小区的情况下，能够根据终端设备的服务小区确定终端设备进行测量评估的小区范围，提升小区切换的效率和成功率。
在一种可能的设计中，至少一个候选小区为层1/层2切换的至少一个候选主小区。
在本申请实施例中，将该小区测量方法应用于层1/层2切换场景，使得在层1/层2场景中，特别是在有连续切换小区的情况下，能够根据终端设备的服务小区确定终端设备进行测量评估的小区范围，提升小区切换的效率和成功率。
在一种可能的设计中，第一指示信息用于指示至少一个候选小区中的第一候选小区对应的第一小区集合，包括：第一指示信息通过指示至少一个小区的物理小区标识PCI指示第一候选小区对应的第一小区集合；或第一指示信息通过指示至少一个小区的配置标识指示第一候选小区对应的第一小区集合，其中，配置标识与至少一个候选小区中的候选小区的配置相关联；或第一指示信息通过比特映射指示信息指示第一候选小区对应的第一小区集合。
在一种可能的设计中，第一小区集合包括的至少一个小区为至少一个候选小区中的小区。
本申请实施例中，第一小区集合中的小区为候选小区中的至少一个小区，则终端设备在切换时测量评估的小区通常小于所有候选小区构成的集合，这样能够减少终端设备进行小区切换时需要测量评估的小区数量，提升小区切换效率，降低测量评估小区的功耗。
第二方面，提供了一种小区测量方法，该方法的执行主体可以是网络设备也可以是应用于网络设备中的芯片。下面以执行主体是网络设备为例进行描述。网络设备确定第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区。所述网络设备发送第一指示信息。
在一种可能的设计中，至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
在一种可能的设计中，至少一个候选小区为层1/层2切换的至少一个候选主小区。
在一种可能的设计中，第一指示信息用于指示至少一个候选小区中的第一候选小区对应的第一小区集合，包括：第一指示信息通过指示至少一个小区的物理小区标识PCI指示第一候选小区对应的第一小区集合；或第一指示信息通过指示至少一个小区的配置标识指示第一候选小区对应的第一小区集合，其中，配置标识与至少一个候选小区中的候选小区的配置相关联；或第一指示信息通过比特映射指示信息指示第一候选小区对应的第一小区集合。
在一种可能的设计中，第一小区集合包括的至少一个小区为至少一个候选小区中的小区。
在一种可能的设计中，该方法还包括：根据以下至少一种信息确定第一候选小区对应的第一小区集合：终端设备上报的测量报告，网络拓扑信息，网络部署信息，统计信息。
在一种可能的设计中，在确定第一候选小区对应的第一小区集合之前，该方法还包括：向第二网络设备发送请求消息，用于请求将第二网络设备的小区作为至少一个候选小区中的一个小区；接收第二网络设备的反馈信息，根据反馈信息确定是否将第二网络设备的小区作为至少一个候选小区中的一个小区。
在一种可能的设计中，反馈信息还用于指示第二网络设备的小区对应的第二小区集合；该方法还包括：根据第二小区集合确定第二网络设备的小区作为第一候选小区时，对应的第一小区集合。
第三方面，提供了一种通信方法，其特征在于，该方法的执行主体可以是终端设备，也可以是应用于终端设备中的芯片。下面以执行主体是终端设备为例进行描述。方法包括：终端设备接收第一消息，第一消息包括候选小区的配置信息。在满足第一条件的情况下，所述终端设备向第一网络设备发送第二消息，第二消息用于请求更新候选小区的配置信息，第一条件包括以下至少一种：服务小区的信号质量小于或等于第一阈值；或终能够检测到的候选小区的数量小于或等于第一数量；或候选小区的信号质量小于或等于第二阈值。
在本申请实施例中，在满足第一条件的情况下，可以触发终端设备向第一网络设备发送第二消息，用于请求更新候选小区的配置信息。这样通过终端设备主动向网络设备请求更新候选小区的配置信息，能够使得终端设备即时获得最准确的候选小区的配置信息，以便进行小区的切换。提升小区切换成功的概率，同时减少因为无法及时获得有效的候选小区的配置信息造成的小区切换时延。
第四方面，提供了一种通信方法，该方法的执行主体可以是终端设备，也可以是应用于终端设备中的芯片。下面以执行主体是终端设备为例进行描述。该方法包括：终端设备接收第一消息，第一消息包括候选小区的配置信息。在满足第二条件的情况下，触发终端设备向第一网络设备发送测量报告，测量报告包括候选小区的信号质量，第二条件包括以下至少一种：服务小区的信号质量小于或等于第二阈值；或终端设备能够检测到的候选小区的数量小于或等于第二数量；或候选小区的信号质量小于或等于第三阈值；或服务小区切换为第一小区，第一小区为第一小区集合中的一个；或除候选小区之外的一个或多个小区的信号质量大于或等于第四阈值。
在本申请实施例中，在满足第二条件的情况下，可以触发终端设备向第一网络设备发送测量报告，用于第一网络设备参考如何更新候选小区的配置信息。这样通过终端设备主动向网络设备发送测量报告，相比于现有技术根据测量配置反馈测量报告，或者周期性发送测量报告，能够更灵活地及时地反馈测量报告，以便网络设备更快更准确地确定更新候选小区的配置信息的方案。进而提升小区切换过程的成功率。
在一种可能的设计中，候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，第二消息用于更新CPA或CPC的配置信息；或候选小区的配置信息为层1/层2切换的候选小区的配置信息，第二消息用于请求更新层1/层2切换的配置信息。
本申请实施例采用的方法，能够使得网络设备在CPA或CPC场景下，特别是连续切换小区的情况下，相比于通常情况下在MN确定添加或变更SN的情况下才获取CPAC配置信息(即CPA或CPC配置信息)的方式，能够更及时地根据接收到的测量报告更新CPAC配置信息，提升SN切换效率和成功率。同样地，相比于通常情况下在CU下发测量配置的情况下才获取测量报告并更新层1/层2切换的配置信息，本申请实施例的方法能够更及时快速地更新层1/层2切换的配置信息，进而提升DU切换效率和成功率。
在一种可能的设计中，该方法还包括：终端设备接收第三消息，第三消息用于指示终端设备切换到目标小区，其中目标小区不属于候选小区；终端设备切换到目标小区，并执行以下任一项：将候选小区的配置信息视为有效或保存；或根据来自第一网络设备的指示信息确定候选小区的配置信息有效或无效。
在本申请实施例中，当终端设备接收到指示信息指示其切换到不属于候选小区的目标小区时，终端设备可以根据预设信息确定将候选小区的配置信息视为有效或保存，降低终端设备被切换回候选小区中的目标小区时，重新下发候选小区的配置信息带来的资源开销。或者终端设备根据第一网络设备的指示信息确定候选小区的配置信息，能够提升终端设备处理候选项小区的配置信息的灵活性。
在一种可能的设计中，该方法还包括：终端设备触发无线资源管理RRC重建过程，RRC重建过程选择的小区属于第一网络设备；终端设备将候选小区的配置信息视为有效或保存。
在本申请实施例中，终端设备触发RRC重建过程，且选择的小区属于第一网络设备，说明终端设备的服务小区未改变，或终端设备与原服务小区距离较近，可以继续保留或使用之前接收到的候选小区的配置信息，减少候选小区的配置信息重发的资源开销。
第五方面，提供了一种通信方法，该方法的执行主体可以是第一网络设备也可以是应用于第一网络设备中的芯片。下面以执行主体是第一网络设备为例进行描述。该方法包括：第一网络设备确定候选小区的配置信息。所述第一网络设备发送第一消息，第一消息包括候选小区的配置信息。所述第一网络设备接收第一消息或测量报告，第一消息用于请求更新候选小区配置信息，测量报告包括候选小区的信号质量。
在一种可能的设计中，候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，第一消息用于请求更新CPA或CPC信配置信息；或候选小区的配置信息为层1/层2切换的候选小区的配置信息，第一消息用于请求更新层1/层2切换的配置信息。
第六方面，提供一种通信装置，该装置包括：接收模块，用于接收第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区；处理模块，用于根据第一指示信息，终端设备测量第一小区集合中的小区，其中，终端设备的服务小区为第一候选小区。
在一种可能的设计中，至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
在一种可能的设计中，至少一个候选小区为层1/层2切换的至少一个候选主小区。
在一种可能的设计中，第一指示信息通过以下任意一种方式指示第一小区集合中的至少一个小区：至少一个小区的物理小区标识PCI；或至少一个小区的配置标识，其中，配置标识与至少一个候选小区中的候选小区的配置相关联；或比特映射指示信息。
在一种可能的设计中，第一小区集合包括的至少一个小区为至少一个候选小区中的小区。
第七方面，提供一种通信装置，该装置包括：处理模块，用于确定第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区；发送模块，用于发送第一指示信息。
在一种可能的设计中，至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
在一种可能的设计中，至少一个候选小区为层1/层2切换的至少一个候选主小区。
在一种可能的设计中，第一指示信息通过一下至少一种方式指示第一小区集合中的至少一个小区：至少一个小区的物理小区标识PCI；或至少一个小区的配置标识，其中，配置标识与至少一个候选小区中的候选小区的配置相关联；或比特映射指示信息。
在一种可能的设计中，第一小区集合包括的至少一个小区为至少一个候选小区中的小区。
第八方面，提供一种通信装置，该装置包括：接收模块，用于接收第一消息，第一消息包括候选小区的配置信息；发送模块，用于在满足第一条件的情况下，向第一网络设备发送第二消息，第二消息用于请求更新候选小区的配置信息，第一条件包括以下至少一种：服务小区的信号质量小于或等于第一阈值；或终能够检测到的候选小区的数量小于或等于第一数量；或候选小区的信号质量小于或等于第二阈值。
第九方面，提供一种通信装置，该装置包括：接收模块，用于接收第一消息，第一消息包括候选小区的配置信息；发送模块，用于在满足第二条件的情况下，触发向第一网络设备发送测量报告，测量报告包括候选小区的信号质量，第二条件包括以下至少一种：服务小区的信号质量小于或等于第二阈值；或能够检测到的候选小区的数量小于或等于第二数量；或候选小区的信号质量小于或等于第三阈值；或服务小区切换为第一小区，第一小区为第一小区集合中的一个；或除候选小区之外的一个或多个小区的信号质量大 于或等于第四阈值。
在一种可能的设计中，候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，第二消息用于更新CPA或CPC的配置信息；或
候选小区的配置信息为层1/层2切换的候选小区的配置信息，第二消息用于请求更新层1/层2切换的配置信息。
在一种可能的设计中，接收模块还用于：接收第三消息，第三消息用于指示该装置切换到目标小区，其中目标小区不属于候选小区；该装置还包括处理模块，用于执行切换到目标小区，并执行以下任一项：将候选小区的配置信息视为有效或保存；或根据来自第一网络设备的指示信息确定候选小区的配置信息有效或无效。
在一种可能的设计中，该装置包括处理模块，用于：触发无线资源管理RRC重建过程，RRC重建过程选择的小区属于第一网络设备；将候选小区的配置信息视为有效或保存。
第十方面，提供一种通信装置，该装置包括：处理模块，用于确定候选小区的配置信息；发送模块，用于发送第一消息，第一消息包括候选小区的配置信息；接收模块，用于接收第一消息或测量报告，第一消息用于请求更新候选小区配置信息，测量报告包括候选小区的信号质量。
在一种可能的设计中，候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，第一消息用于请求更新CPA或CPC信配置信息；或候选小区的配置信息为层1/层2切换的候选小区的配置信息，第一消息用于请求更新层1/层2切换的配置信息。
第十一方面，本申请实施例提供一种终端设备，包括：
存储器，用于存储指令；以及
至少一台处理器，与所述存储器耦合；
其中，当所述至少一台处理器执行所述指令时，所述指令致使所述处理器执行第一方面、第三方面或第四方面任一项所述的方法。
第十二方面，本申请实施例提供一种网络设备，包括：
存储器，用于存储指令；以及
至少一台处理器，与所述存储器耦合；
其中，当所述至少一台处理器执行所述指令时，所述指令致使所述处理器执行第二方面或第五方面任一项所述的方法。
第十三方面，本申请实施例提供一种芯片系统，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得该芯片系统实现上述第一方面～第五方面任一方面的方法。
可选地，该芯片系统还包括接口电路，该接口电路用于交互代码指令至所述处理器。
可选地，该芯片系统中的处理器可以为一个或多个，该处理器可以通过硬件实现也可以通过软件实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等。当通过软件实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现。
可选地，该芯片系统中的存储器也可以为一个或多个。该存储器可以与处理器集成在一起，也可以和处理器分离设置，本申请并不限定。示例性的，存储器可以是非瞬时性处理器，例如只读存储器ROM，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请对存储器的类型，以及存储器与处理器的设置方式不作具体限定。
第十四方面，本申请实施例提供一种计算机可读存储介质，其上存储有计算机程序或指令，当该计算机程序或指令被执行时，使得计算机执行上述第一方面～第五方面任一方面的方法。
第十五方面，本申请实施例提供一种计算机程序产品，当计算机读取并执行所述计算机程序产品时，使得计算机执行上述第一方面～第五方面任一种可能的实现方式中的方法。
第十六方面，本申请实施例提供一种通信系统，该通信系统包括上述的第六方面，和/或包括第七方面的装置；或者该通信系统包括上述的第八方面或第九方面的装置，和/或包括第十方面的装置。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍。
图1为本申请实施例提供的一种双连接的结构示意图；
图2为本申请实施例提供的一种NG-RAN架构示意图；
图3为本申请实施例提供的一种切换过程示意图；
图4A为本申请实施例提供的一种CPA流程图；
图4B为本申请实施例提供的一种CPC流程图；
图4C为本申请实施例提供的一种连续CPAC示意图；
图5A为本申请实施例提供的一种L1/L2切换的过程示意图；
图5B为本申请实施例提供的一种条件L1/L2切换的过程示意图；
图5C为本申请实施例提供的一种连续L1/L2切换的场景示意图；
图6A为本申请实施例提供的一种小区测量方法流程图；
图6B为本申请实施例提供的一种比特位图与候选小区的对应关系图；
图7A为本申请实施例提供的一种通信方法流程图；
图7B为本申请实施例提供的一种终端设备位置移动示意图；
图8为本申请实施例提供的一种通信方法流程图；
图9为本申请实施例提供的一种通信方法流程图；
图10为本申请实施例提供的另一种通信方法流程图；
图11为本申请实施例提供的一种通信装置结构框图；
图12为本申请实施例中的一种通信装置的硬件结构示意图。
具体实施方式
本申请的说明书和权利要求书及所述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。本文的不同实施例也可以结合使用。
“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
首先对结合图示对本申请实施例中的专业术语进行介绍。
移动性：移动性管理是通过变更终端设备(user equipment,UE)的服务小区，使UE无论在网络覆盖范围内如何移动，都可以享受网络服务。连接态的移动性是通过切换完成的。
双连接：双连接(Dual-Connectivity，DC)或多连接(Multi-Radio Dual Connectivity，MR-DC)指的是UE可以同时跟两个基站通信，两个基站可以一个是新空口(New Radio，NR)基站，一个是长期演进(Long Term Evolution，LTE)基站，或者两个都是NR基站。两个基站中，提供与核心网的控制面连接的被称为主节点(Master Node，MN)(也可以被称为主基站)，不提供与核心网的控制面连接的被称为辅节点(Secondary Node,SN)(也可以被称为辅基站)。
双连接+载波聚合：具体可参阅图1，图1为本申请实施例提供的一种双连接的结构示意图。当双连接与载波集合(Carrier Aggregation，CA)结合时，每个基站下可以包括一个小区组(Cell Group，CG)：主站下的小区组为主小区组(Master Cell Group,MCG)，辅站下的小区组为辅小区组(Secondary Cell Group,SCG)。主小区组可以包括主小区(PCell)和辅小区(SCell)，辅小区组可以包括主辅小区(PSCell)和辅小区(SCell)。
基站架构：可参阅图2，图2为本申请实施例提供的一种NG-RAN架构示意图，如图2中的(a)所示，5G无线接入网(Next Generation Radio Access Network,NG-RAN)可以为分布单元(Distributed Unit,DU)和汇聚单元(Central Unit,CU)分离架构。如图2中的(b)所示，DU包括物理层(主要是包括高层物理层，即high-PHY)、媒体接入控制(Media Access Control,MAC)层和无线链路控制(Radio Link Control,RLC)层，CU包括分组数据汇聚控制(Packet Data Convergence Control,PDCP)层和无线资源管理(Radio Resource Control,RRC)层。NG-RAN还可以包括有源天线处理单元(Active Antenna Processing Unit,AAU)，AAU包括低层物理层(即low-PHY)，射频单元(Radio Frequency,RF)和天线。按照协议 栈分层，层1(L1)为物理层，层2(L2)包括MAC层、RLC层和PDCP层，层3(L3)为RRC层。
切换：通过RRC层来完成切换，可参阅图3，图3为本申请实施例提供的一种切换过程示意图，具体流程如下：
1.源基站(gNB)对UE进行测量配置；
2.UE根据测量配置，进行测量结果上报，UE的测量结果用于辅助源基站进行切换判决；
3.源基站参考UE上报的测量结果，根据自身的切换算法进行切换判决；
4.源基站向目标基站发送切换请求，传递必要的用于切换准备的相关信息，这些信息至少包括目标小区标识、密钥、终端在源小区的ID，基本的接入层配置等；
5.目标基站执行接入控制；
6.目标基站进行L1/L2的切换准备，并向源基站发送切换请求应答消息(Acknowledge，ACK)，其中向UE发送的切换命令以RRC容器(container)的方式包含在ACK消息中；
7.源基站触发切换(HandOver,HO)，向UE发送切换命令(HO Command)。切换命令是目标基站生成的并通过源基站透传的(具体可通过包含同步信息的RRC重配消息发送)，源基站可以对该消息进行必要的加密和完整性保护。切换命令包含了接入目标小区需要的信息，至少包括目标小区标识、新的UE ID、目标基站的安全算法标识，还有可能携带接入目标小区的专用随机接入信道(Random Access Channel，RACH)资源等；
8.源基站向目标基站发送序列号状态传输(status transfer)；
9.UE收到切换命令之后，执行与目标基站之间的同步，用于切换成功之后与目标基站进行通信；
10.目标基站回复随机接入响应(Random Access Response，RAR)，进行上行资源分配(Uplink grant)以及定时提前(Timing Advance，TA)；
11.UE向目标基站发送RRC重配完成消息，向目标基站确认切换过程完成，该消息还可能伴随一个上行缓存状态报告(Buffer Status Report,BSR)的发送。目标基站通过接收RRC重配完成消息确认切换过程成功。至此，目标基站可开始向终端发送数据；
12.目标基站向认证管理功能(Authentication Management Function，AMF)发送路径转换请求消息告知AMF更换了小区，触发核心网(5GC)转换下行(Downlink，DL)数据路径到目标基站，并建立到目标基站的NG-C接口。此时空口的切换已经成功完成；
13.AMF向用户面功能(User Plane Function，UPF)发送用户面(User Plane，UP)更新请求消息；
14.UPF将DL数据路径切换到目标基站。UPF向源小区发送一个或多个结束标记，然后就可以释放其余源基站之间的UP资源或传输网络层资源；
15.UPF向AMF发送UP更新响应消息；
16.AMF向目标基站发送路径转换ACK消息；
17.目标基站收到路径转换ACK消息之后，向源基站发送UE上下文释放消息，通知源基站切换成功并触发源基站释放UE上下文；
18.源基站在收到UE上下文释放消息后，可以释放无线承载和与UE上下文相关的控制面(Control Plane,CP)资源。如果数据转发还没有完成，源基站不会释放相关的资源，继续数据转发，直至数据转发完成之后再释放相关资源。
条件PSCell添加和变更(Conditional PSCell Addition/Change，CPAC)：指的是条件PSCell添加(Conditional PSCell Addition,CPA)和条件PSCell变更(Conditional PSCell Change，CPC)过程。CPA和CPC都是针对DC场景中辅站主小区(PSCell)的添加或变更。其主要思想是：网络配置多个候选PSCell小区，且每个候选PSCell小区配置均包括有该小区的配置和执行条件，当执行条件满足时，UE可以自主执行PSCell的添加或变更。
CPA：CPA过程是当满足PSCell添加条件时，执行PSCell添加过程。可参阅图4A，图4A为本申请实施例提供的一种CPA流程图，以MR-DC场景下，MN触发的CPA为例流程如下：
1.MN向候选小区所在的SN发送辅站添加请求；
2.候选小区所在的SN向MN发送辅站添加请求确认(ACK)，其中可以包含RRC重配消息a；
3.MN通过RRC重配消息(即RRC重配消息A)向UE发送CPA配置。RRC重配消息中包括CPA配置(即一个或多个RRC重配消息b)和关联的执行条件。每个RRC重配消息b中包含一个来自候选SN的RRC重配消息a，可选包含MCG配置；
4.UE接收到MN的RRC重配消息后，向MN回复RRC重配完成消息。UE使用RRC重配消息中的 除CPA配置外的其他RRC配置；另外在UE接收到MN的RRC重配消息后，UE还执行步骤4a：
4a.UE开始评估执行条件，一旦一个候选小区的执行条件被满足，则UE使用RRC重配消息中选择的候选小区的配置，并向MN发送RRC重配完成消息，RRC重配完成消息包括选择的候选小区的RRC重配完成消息和选择的候选小区信息；
5.MN向选择的候选小区所在的SN转发选择的候选小区的RRC重配完成消息，以通知SN成功完成重配过程。MN还可以向其他候选SN发送SN释放请求消息以取消CPA；
6.UE执行向选择的PSCell(上述选择的候选小区/满足执行条件的候选小区)的RACH过程；
7.MN向目标SN发送序列号状态传输；
8.MN和目标SN执行数据转发；
9～12.执行路径转换过程。
CPC：CPC过程是当满足PSCell变更条件时，执行PSCell变更过程。可参阅图4B，图4B为本申请实施例提供的一种CPC流程图，以MR-DC场景下MN触发的CPC流程为例：
1.MN向候选小区所在的SN(包括图示中的T-SN和候选T-SN)发送辅站添加请求；
2.候选小区所在的SN向MN发送辅站添加确认(ACK)，其中可以包含RRC重配消息a；
3.MN通过RRC重配置消息(RRC重配消息A)向UE发送CPC配置。RRC重配消息中包括CPC配置(即一个或多个RRC重配消息b)和关联的执行条件。每个RRC重配消息b中包含一个来自候选SN的RRC重配消息a，可选包括MCG配置；
4.UE接收到MN的RRC重配消息后，向MN回复RRC重配完成消息。UE使用RRC重配消息中的除CPC外的其他RRC配置；
4a.MN通过Xn-U地址指示(Address Indication)告知源SN(S-SN)已经触发了CPC；
5.UE开始评估执行条件，一旦一个候选小区的执行条件被满足，则UE使用RRC重配消息中选择的候选小区的配置，并向MN发送RRC重配完成消息，RRC重配完成消息包括选择的候选小区的RRC重配完成消息和选择的候选小区信息；
6.MN告知源SN(S-SN)停止与UE的数据传输；
7.MN告知目标SN(T-SN)(上述选择的候选小区/满足执行条件的候选小区所在的SN)完成目标SN的RRC重配过程，MN还可以向其他候选SN发送SN释放请求消息以取消CPC；
8.UE执行向目标SN的RACH过程；
9.源SN通过MN向目标SN发送序列号状态传输；
10.MN和目标SN执行数据转发。
11～17.执行路径转换过程。
上述图4A和图4B的过程都是MN触发的CPA或CPC过程。实际上，还可以由SN触发CPC，即由源SN向MN发送辅站添加请求。MN在确定能够进行辅站变更的情况下，执行步骤1以及后续步骤。在此不再赘述。
连续CPAC：在上述CPA和CPC过程中，完成与目标小区之间的RACH过程之后，UE会释放CPA/CPC配置。因此在网络重配或者网络重新启动之前，UE无法使用CPAC配置。为了减少SCG更改的时延和信令开销，连续CPAC(subsequent CPAC)允许SCG更改之后，网络重配之前继续执行CPAC，也即连续CPAC。可参阅图4C，图4C为本申请实施例提供的一种连续CPAC示意图，如图4C所示，其场景如下描述：
1.UE与主站MN以及SN下的小区3(C3)通信(可能还有其他SCell)，小区3为UE此时的PSCell小区；
2.网络为UE配置了CPC配置，其中候选小区包括小区{1,2,…,9}，CPC配置中还可以包括每个候选小区的配置以及执行条件；
3.UE检测到小区5(C5)的执行条件被满足，则UE将PSCell小区变更为小区5。UE在完成与小区5的连接后，并不释放CPC配置，而是继续维护CPC配置，并执行CPC过程。
4.UE可以继续评估其他候选小区，当有其他候选小区满足执行条件时，UE应触发PSCell变更过程。例如图4C中，UE后续又检测到小区3满足执行条件，因此UE又将PSCell小区切换为小区3。
L1/L2切换：L1/L2(Layer 1/Layer 2，层1或层2)切换是相对上述图3中的RRC切换而言的，指的是通过MAC控制单元(Control Element,CE)或下行控制信息(Downlink Control Information,DCI)完成切换过程，其增益是减少接入的时延，从而减少业务的中断，并减少信令开销。请参阅图5A，图5A为本 申请实施例提供的一种DU间切换的L1/L2切换的过程示意图，如图5A所示，包括但不限于以下步骤：
1.CU向UE下发测量配置；
2.UE根据测量配置向CU上报测量报告；该测量报告用于辅助CU进行切换判决和候选小区的确定；
3.CU向候选DU(包括目标DU)发送切换请求或候选小区添加请求；
4.候选DU(包括目标DU)根据切换请求进行切换准入控制，并向CU发送HO请求确认(ACK)；
5.CU向UE下发L1/L2预配置信息；其中L1/L2切换预配置信息中可以包含多个候选小区，以及多个候选小区的配置信息。L1/L2预配置信息可以包含在RRC重配消息中。UE在收到L1/L2预配置信息后，继续保持与源小区的数据传输。UE可以根据网络的配置执行测量，供网络做切换判决；
6.源DU向UE下发L1/L2切换命令，L1/L2切换命令用于指示UE切换到目标DU下的目标小区；
7.UE执行RACH过程，与目标小区建立连接。在收到L1/L2切换命令后，UE断开与源小区的数据传输；
8.UE与目标DU建立连接后，与目标DU进行数据传输。后续DU与CU间的路径转换过程不再赘述。
条件L1/L2切换：条件L1/L2切换指的是网络针对L1/L2切换的候选小区下发执行条件，当执行条件满足时，UE触发L1/L2切换。请参阅图5B，图5B为本申请实施例提供的一种DU间切换的条件L1/L2切换的过程示意图，如图5B所示，包括但不限于以下步骤：
步骤1～步骤4与图5A的步骤1～步骤4完全相同，在此不再赘述。
5.CU向UE下发L1/L2预配置信息；其中L1/L2切换预配置信息中可以包含多个候选小区，以及多个候选小区的配置信息和关联的执行条件。只有当UE评估候选小区满足执行条件时，UE触发L1/L2切换。L1/L2预配置信息可以包含在RRC重配消息中；
6.UE存储L1/L2预配置信息，并开始评估候选小区；此时UE继续与源DU进行数据传输；
7.UE检测到有候选小区满足执行条件，则将该候选小区作为目标小区，目标小区所在的候选DU作为目标DU；
8.UE向目标DU发起RACH过程，与目标DU建立连接。
9.UE与目标DU建立连接后，与目标DU进行数据传输。后续DU与CU间的路径转换过程不再赘述。
除上述DU间的L1/L2切换(包括条件L1/L2切换)外，还有DU间的L1/L2切换(包括DU间的条件L1/L2切换)。也即切换的目标小区和源小区属于同一DU，将图5A、图5B中的源DU和目标DU分别替换为源小区和目标小区。
需要说明的是，条件L1/L2切换是L1/L2切换中的一种切换方式。因此，下述实施例中，能够运用于L1/L2切换的实施方式，同样能够运用于条件L1/L2切换，反之亦然。下述实施例中不再赘述。
连续L1/L2切换：在一次L1/L2切换完成后，可以继续保存候选小区预配置以支持连续的L1/L2切换。具体可参阅图5C，图5C为本申请实施例提供的一种连续L1/L2切换的场景示意图，如图5C所示，基站的功能由独立CU以及独立的DU组合完成。一个CU可以连接一个或多个DU，每个DU通过其对应的小区与UE建立连接。其中：
1.UE与DU下的小区3(C3)通信，小区3为UE此时的PCell；
2.网络为UE下发了L1/L2切换预配置信息，其中预配置信息中的候选小区包括小区{1,2,…,9}，L1/L2切换预配置信息中包括每个候选小区的配置，可选地还可以包括每个候选小区关联的执行条件；
3.UE检测到小区4(C4)的执行条件被满足，或UE收到基站的切换命令指示其切换到小区4(C4)，则UE将PCell小区变更为小区4。
UE在完成一次向目标小区的接入后，并不释放L1/L2切换预配置信息，而是继续维护L1/L2切换预配置信息。
4a.可选地，UE可以继续评估其他候选小区，当有其他候选小区满足执行条件时，UE应触发PCell变更过程。例如图5C中，UE后续又检测到小区3满足执行条件，因此UE又将PCell小区切换为小区3。
4b.可选地，UE又收到基站的切换命令指示其切换到小区5(C5)，因此UE又将PCell小区切换为小区5。
根据上述描述可知，在需要进行连续的小区切换的场景下，包括连续CPAC，或者连续L1/L2切换和连续条件L1/L2切换等，都包括以下两个特征：(1)网络可能需要为终端设备配置更多的候选小区，以供后续继续进行切换；(2)UE在完成一次小区切换后，并不释放相关的候选小区配置信息，而是继续维护配置信息，以便执行下一次小区切换。这些情况可能导致UE被分配或需要维护较多候选小区。并且随着UE的移动，并不是所有候选小区都适合UE执行小区切换过程。那么如果UE对所有候选小区都进行测量 或评估以确定进行切换的目标小区，将存在测量小区范围不明确，切换小区效率低等问题。同时可能造成额外的测量功耗。
基于此，请参阅图6A，为本申请实施例提供的一种小区测量方法流程图，如图6A所示，该方法包括如下步骤：
101、第一网络设备确定第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的(或关联的)第一小区集合，第一小区集合包括至少一个小区。
本申请实施例中的第一网络设备是指小区切换过程中，为终端设备提供控制面连接的接口设备。例如在CPAC中，第一网络设备可以指主基站(MN)。在L1/L2切换或条件L1/L2切换中，第一网络设备可以指主基站的汇聚单元(CU)。在一些可能的情况下，假设辅基站(SN)也被划分为独立的CU和DU结构，则第一网络设备也可以指SN的CU。
本申请实施例中的终端设备(Terminal Equipment)也可以称为终端、用户设备(User Equipment，UE)、移动台(Mobile Station，MS)、移动终端(Mobile Terminal，MT)等。终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(Virtual Reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(Industrial Control)中的无线终端、无人驾驶(Self Driving)中的无线终端、远程手术(Remote Medical Surgery)中的无线终端、智能电网(Smart Grid)中的无线终端、运输安全(Transportation Safety)中的无线终端、智慧城市(Smart City)中的无线终端、智慧家庭(Smart Home)中的无线终端等等。
第一网络设备首先可以获取终端设备的至少一个候选小区，具体例如可以基于网络拓扑，网络部署、预计的终端移动方向或统计信息中的一项或多项确定候选小区，还可以结合终端设备上报的测量报告(包括层1测量报告或层3测量报告)确定终端设备的候选小区。
示例性，至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。也即是说，本申请实施例可以应用到CPA或CPC过程中，即如图4A～图4C对应的场景中。
进一步地，MN可以向候选SN发送SN添加请求，用于确定SN是否允许将其下的小区作为添加或变更的候选小区。MN在接收到候选SN发送的SN添加请求ACK之后，确定将该SN下确认的小区作为添加或变更的候选小区。如图4A～图4C中的步骤1～步骤2。MN将该SN下确认的小区包含在第一指示信息的至少一个候选小区中。示例性，在MN向候选SN发送SN添加请求之前，SN可以向MN发送SN变更请求。
确定主辅小区添加或变更的多个候选小区后，MN可以进一步确定多个候选小区中的任意一个第一候选小区对应的第一小区集合。
示例性，MN可以基于网络拓扑，网络部署、预计的终端移动方向或统计信息中的一项或多项确定第一候选小区对应的第一小区集合，还可以结合终端设备上报的测量报告确定第一候选小区对应的第一小区集合。
在一些情况下，MN向候选SN(如候选第一SN)发送的SN添加请求中可以包括候选SN列表。候选第一SN接收所述SN添加请求后，还可以向其他候选SN发送请求消息，用于请求确定其他候选SN是否同意将所述其他候选SN的小区包含在候选第一SN下的小区所对应的第一小区集合。如果其他候选SN同意将所述其他候选SN的小区包含在候选第一SN下的小区所对应的第一小区集合，则候选第一SN向MN发送的SN添加请求ACK(或者其他消息)中，还可以包括候选第一SN或候选第一SN下的候选小区关联的第一小区集合。MN可以基于多个候选SN发送的第一小区集合确定多个候选小区中任意一个第一候选小区对应的第一小区集合。
示例性，至少一个候选小区为L1/L2切换或条件L1/L2切换的至少一个候选主小区。也即是说，本申请实施例也可以应用到L1/L2切换或条件L1/L2切换过程中，即如图5A～图5C对应的场景中。
进一步地，CU可以向候选DU发送请求消息，用于确定候选DU是否允许将其下的小区作为切换的候选小区。CU在接收到候选DU发送的请求ACK之后，确定将该DU下确认的小区作为切换的候选小区。如图5A～图5C中的步骤3～步骤4。CU将该DU下确认的小区包含在第一指示信息的至少一个候选小区中。
确定L1/L2切换的多个候选小区后，CU可以进一步确定多个候选小区中的任意一个第一候选小区对应的第一小区集合。
示例性，CU可以基于网络拓扑，网络部署、预计的终端移动方向、来自DU的信息或统计信息中的一项或多项确定第一候选小区对应的第一小区集合，还可以结合终端设备上报的测量报告确定第一候选小区对应的第一小区集合。
第一小区集合中的至少一个小区为第一候选小区作为终端设备的服务小区(服务PSCell或服务PCell)时，终端设备进行测量或评估的小区。当终端设备的服务小区为第一候选小区时，终端设备仅需要测量第一小区集合中的小区，或终端设备仅需要评估第一小区集合中的小区是否满足执行条件。具体可参阅表1，如下：
表1
需要说明的是，表1中只示出了多个候选小区中部分候选小区作为第一候选小区时，其对应的第一小区集合。但可以推论得到第一指示信息可以用于指示部分或全部候选小区作为第一候选小区时，其对应的第一小区集合，表1不对此造成限制。
示例性，第一小区集合包括至少一个候选小区中除第一候选小区外的一个或多个小区，或者第一小区集合中的小区属于所述至少一个候选小区。如表1所示，当第一候选小区为小区3时，其对应的第一小区集合中包括小区1、小区2、小区4、小区5和小区8，这些小区都是第一网络设备为终端设备配置的候选小区中的小区。第一候选小区关联的第一小区集合中的小区可以是终端设备位于第一候选小区覆盖范围时，可以检测到或信号质量较好的候选小区。当终端设备的服务小区为第一候选小区时，终端设备可以基于第一小区集合仅测量或评估部分候选小区，达到节省功率开销的目的。
示例性，第一小区集合中的小区可以包括至少一个候选小区之外的其他小区。如表1所示，当第一候选小区为小区4时，其对应的第一小区集合中包括小区3、小区5以及小区11，其中小区11不属于为终端设备配置的至少一个候选小区中的一个，但是小区11与小区4邻近，当小区4作为终端设备的服务小区时，小区11有可能满足终端设备的切换需求。因此，第一网络设备可以将小区11作为小区4的第一小区集合中的小区进行指示。第一候选小区关联的第一小区集合中的小区可以是终端设备位于第一候选小区覆盖范围时，可以检测到或信号质量较好的小区。当终端设备的服务小区为第一候选小区时，终端设备可以基于第一小区集合测量第一候选小区附近其他信号质量较好的邻区，从而避免终端设备错过高质量邻区，保证终端设备切换的目标小区的质量。
示例性，第一指示信息用于指示至少一个候选小区中的第一候选小区对应的第一小区集合，包括：第一指示信息可以通过指示至少一个小区的物理小区标识PCI(Physical Cell Identifier，PCI)来指示第一小区集合。例如网络通过PCI列表的形式指示第一小区集合。
或者，第一指示信息可以通过指示小区的配置标识来指示第一小区集合。例如第一网络设备在预配置信息中包括配置标识(Config ID)，配置标识与一个候选小区配置相关联。示例性还可以与候选小区的执行条件关联。其中在候选小区满足执行条件的情况下，终端设备可以执行候选小区的添加或切换。其中预配置信息可以是图4A中CPA配置或图4B中的CPC配置或图5A～图5B中的L1/L2预配置信息。网络可以通过配置标识列表的形式指示第一小区集合。
或者，第一指示信息也可以通过比特映射指示信息指示第一候选小区对应的第一小区集合。例如采用与候选小区对应的比特来指示第一小区集合。此时第一小区集合中的小区属于网络侧为终端设备配置的多个候选小区。具体可参阅图6B，图6B为本申请实施例提供的一种比特位图与候选小区的对应关系图。如图6B所示，候选小区为小区1～小区9(C1～C9)，分别与比特位图中的9个比特对应，小区2对应的比特位图为001110011，表示小区2对应的第一小区集合中包括小区{3,4,5,8,9}。或者，采用网络侧能够为终端设备配置的最大候选小区个数对应的比特来指示第一小区集合中的小区。例如能够为终端设备配置的最大候选小区个数为16个，对应小区1～小区16，假设小区3的第一指示信息为1101 0011 1000 0000，其中小区1，小区2，小区3，小区7，小区8，小区9对应的比特指示符为“1”，表示这些小区为小区3的第一小区集合中的小区，其他比特指示符为“0”的表示这些小区不为小区3的第一小区集合中的小区。
或者第一指示信息还可以通过其他方式进行第一小区集合中的小区的指示，上述实施方式只是进行部分举例，不应该造成对第一指示信息指示方式的具体限定。
需要说明的是，在上述步骤101中描述了第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合。应当明确的是，至少一个候选小区，以及第一候选小区对应的第一小区集合，可以通过第一指示信息在同一个消息中进行指示，也可以在不同的消息中进行指示。
以CPAC场景为例，至少一个候选小区(候选主辅小区)可以在MN向终端设备发送的第一RRC重配消息中指示。MN向终端设备发送第一RRC重配消息时，包括SN的RRC重配消息，也即CPAC配置信息，相应地可能会进行候选主辅小区的更新。因此，也可以在该CPAC配置信息中指示终端设备的至少一个候选主辅小区，以便终端设备进行SN的切换。也即第一指示信息可以在第一RRC重配消息中发送，用于同时指示至少一个候选主辅小区以及第一候选小区对应的第一小区集合。或者，第一指示信息可以分别在第一RRC重配消息和第二RRC重配消息(包括CPAC配置信息，第一指示信息可以携带在CPAC配置信息中)中发送，前者用于指示至少一个候选主辅小区，后者用于指示第一候选小区对应的第一小区集合。
或者，以L1/L2切换场景为例，至少一个候选小区(候选主小区)可以在CU向终端设备下发的第三RRC重配消息中指示。或者，CU可能会根据终端设备周期性上报的测量报告进行候选主小区的更新，因此，可以在CU通过第三RRC重配消息向EU下发L1/L2预配置信息时，指示候选DU对应的至少一个候选主小区，以便终端设备进行DU的切换。即是说，第一指示信息可以在第三RRC重配消息中发送，用于同时指示至少一个候选主小区以及第一候选小区对应的第一小区集合。或者，第一指示信息可以分别在第三RRC重配消息和第四RRC重配消息(包括L1/L2预配置信息，第一指示信息可以携带在L1/L2配置信息中)中发送，前者用于指示至少一个候选主小区，后者用于指示第一候选小区对应的第一小区集合。
在上述描述中，在同一个消息中发送第一指示信息，用于同时指示至少一个候选小区以及第一候选小区对应的第一小区集合，能够一次性完成候选小区、第一候选小区的第一小区集合的指示，方便终端设备确保多个候选小区与第一候选小区的一致性和完整性。而通过不同消息发送第一指示信息，用于分别指示至少一个候选小区，以及第一候选小区对应的第一小区集合。并且通常情况下，先指示至少一个候选小区，后指示第一候选小区对应的第一小区集合。这样可以减少终端设备获得至少一个候选小区的时延，以便终端设备根据获取到的至少一个候选小区进行其他处理(包括进行候选小区测量等)，而第一网络设备可以根据终端设备更新的位置实时指示第一候选小区以及第一小区集合，提升该信息指示的准确性和实时性，避免不必要的指示内容发送，降低通信开销。
102、第一网络设备发送第一指示信息。例如，第一指示信息可以包含在预配置信息中，预配置信息可以是图4A中CPA配置或图4B中的CPC配置或图5A～图5B中的L1/L2预配置信息。即第一网络设备发送第一指示信息可以通过图4A～图4C中的步骤3或图5A～图5C中的步骤5。
103、终端设备接收第一指示信息，根据第一指示信息，终端设备测量或评估第一小区集合中的小区，其中，终端设备的服务小区为第一候选小区。也即第一指示信息用于指示当终端设备的服务小区为第一候选小区的情况下，终端设备测量(或评估)的小区。
第一网络设备在确定第一指示信息后，向终端设备发送第一指示信息。终端设备接收第一指示信息，并根据第一指示信息进行小区测量或评估过程。例如终端设备根据第一指示信息进行小区测量可以对应到图5A中的步骤5。再例如终端设备根据第一指示信息进行小区评估可以对应到图4A中的步骤4a或图4B中的步骤5或图5B中的步骤6。
例如针对CPC场景，第一候选小区为终端设备的服务小区，表示第一候选小区为终端设备的主辅服务小区。若服务小区为第一候选小区，终端设备基于第一指示信息评估第一小区集合中的小区是否满足执行条件。其中执行条件可以包含在第一指示信息所在的消息中。终端设备接收到如表1所示的第一指示信息，而当终端设备的主辅服务小区为小区5时，终端设备对第一小区集合小区{3,4,6,9}中的小区进行测量评估，确定这些小区中是否有满足执行条件的小区。如果有，则进行主辅服务小区的切换，或完成SN的切换。
例如针对L1/L2切换场景，第一候选小区为终端设备的服务小区，表示第一候选小区为终端设备的主服务小区(在一些情况下，也可以为终端设备的主辅服务小区)。若服务小区为第一候选小区，终端设备基于第一指示信息测量第一小区集合中的小区。或者若服务小区为第一候选小区，终端设备基于第一指示信息评估第一小区集合中的小区是否满足执行条件。终端设备接收到如表1所示的第一指示信息，而当终端设备的主服务小区(或主辅服务小区)为小区5时，终端设备对第一小区集合小区{3,4,6,9}中的小区进行测量或评估。如果终端设备对第一小区集合中的小区进行评估，确定这些小区中是否有满足执行条件的小区。如果有，则进行主服务小区(或主辅服务小区)的切换。
需要说明的是，终端设备测量或评估第一小区集合中的小区并不意味着终端设备一定可以检测到第一小区集合中的所有小区，终端设备仅尝试测量第一小区集合中的小区。示例性，终端设备的服务小区为第一候选小区的情况下，不需要测量或评估第一小区集合外的其他小区。
可见，在本申请实施例中，由第一网络设备获取第一指示信息，第一指示信息用于指示至少一个候选 小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合。终端设备接收该第一指示信息，并根据第一指示信息指示的第一小区集合进行小区测量。这个过程中，通过确定每个第一候选小区对应的第一小区集合，一方面，假设第一小区集合中的小区为候选小区中的部分小区，则能够减少终端设备进行小区切换时需要测量或评估的小区，提升切换效率，节省了终端设备的功率；另一方面，假设第一小区集合中的小区包括候选小区之外的小区，则能够使得终端设备测量评估的小区不限定在为终端设备配置的至少一个候选小区中，提升终端设备切换小区的成功率。总之，本申请实施例将终端设备进行测量评估的小区与服务小区相关联，使得测量评估小区范围随着服务小区的变化而变化，提升小区测量评估的效率，进而提升小区切换过程的效率。
上述实施例用于描述终端设备位置移动时，终端设备需要进行测量评估的候选小区可能随之变化的情况。而在另一些情况下，随着终端设备的位置移动，可能网络侧为终端设备进行的相关配置也不再有效。具体地，请参阅图7A，图7A为本申请实施例提供的一种通信方法流程图，如图7A所示，该方法包括如下步骤：
201、第一网络设备确定候选小区的配置信息。
与前述实施例相同的，第一网络设备是指小区切换通信中，为终端设备提供控制面连接的接口设备。例如在CPAC中，第一网络设备可以指MN，在L1/L2切换或条件L1/L2切换中，第一网络设备可以指主基站的CU。在一些可能的情况下，第一网络设备也可以指SN的CU。
第一网络设备可以确定候选小区的配置信息，例如候选小区标识，候选小区的接入条件，候选小区对应的测量配置等。第一网络设备可以根据网络拓扑、网络部署、以及小区参数，例如小区所在频段等信息确定候选小区的配置信息。
202、第一网络设备向终端设备发送第一消息，第一消息中包括候选小区的配置信息。
第一网络设备确定候选小区的配置信息后，通过第一消息向终端设备发送该候选小区的配置信息，以便终端设备测量或评估候选小区。候选小区的配置信息具体可以包含在图4A中CPA配置或图4B中的CPC配置或图5A～图5B中的L1/L2预配置信息中。
203、终端设备接收第一消息，在满足第一条件的情况下，终端设备向第一网络设备发送第二消息，第二消息用于请求更新候选小区的配置信息。其中，第一条件为服务小区或候选小区的信号质量需要满足的条件，例如第一条件包括以下至少一种：服务小区的信号质量小于或等于第一阈值；或能够检测到的候选小区的数量小于或等于第一数量；或候选小区的信号质量小于或等于第二阈值。
在一些情况下，由于终端设备的移动产生的位置变化，具体请参阅图7B，图7B为本申请实施例提供的一种终端设备移动位置示意图，如图7B所示，当终端设备在位置1时，第一网络设备基于终端设备的当前服务小区C3为终端设备下发了候选小区的配置信息，候选小区包括C{1,2,4，…，8}；当终端设备移动到位置2时，该候选小区的配置信息依然适用。但是当终端设备移动到位置3时，一些远距离的候选小区例如小区{2,5,7}不再为终端设备能够测量到的小区，这些小区不应再作为终端设备的候选小区，相对应地，终端设备可能有新的候选小区，例如小区9。那么终端设备之前接收到的候选小区的配置信息不再适用。而第一网络设备不一定能够及时更新候选小区的配置信息，这样可能导致终端设备进行小区切换失败或通信质量较差。
基于此，终端设备可以触发向第一网络设备发送第二消息，用于请求更新候选小区的配置信息或用于请求更新候选小区。具体的触发条件包括第一条件，第一条件具体可以包括以下一种或多种：
(1)服务小区的信号质量小于或等于第一阈值。例如图7B中，当终端设备的服务小区为C3时，接收到候选小区的配置信息。而当终端设备移动到位置3时，服务小区C3的信号质量变差，当服务小区C3的信号质量小于或等于第一阈值时，则可以触发终端设备向第一网络设备发送第二消息。其中小区的信号质量例如可以由参考信号接收功率(Reference Signal Receiving Power，RSRP)，载波接收信号强度(Received Signal Strength Indication，RSSI)，参考信号接收质量(Reference Signal Receiving Quality，RSRQ)等参数来表征，第一阈值例如为RSRP的阈值，具体为-110dBm(分贝毫瓦)。第一阈值为网络配置或预定义的，例如第一阈值包含在第一消息中。
(2)终端设备能够检测到的候选小区的数量小于或等于第一数量。例如图7B中，由于候选小区的配置信息是第一网络设备基于当前的服务小区C3下发的，则终端设备在位置1时能够检测到较多的候选小区。而当终端设备移动到位置2，进一步移动到位置3时，由于距离候选小区信号覆盖范围越来越远，终端设备能够检测到的候选小区数量越来越少。因此当终端设备能够检测到的候选小区的数量小于或等于第一数量时，可以触发终端设备向第一网络设备发送第二消息。第一数量为网络配置或预定义的，例如第一 数量包含在第一消息中。
(3)候选小区的信号质量小于或等于第二阈值。这里可以指第一网络设备为终端设备配置的全部候选小区的信号质量均小于或等于第二阈值，也可以指候选小区中第三数量的候选小区的信号质量均小于或等于第二阈值。其中第二阈值和第三数量可以是网络配置或预定义的，例如第二阈值和/或第三数量包含在第一消息中。此时说明所有候选小区或较多候选小区质量较差，终端设备无法进行有效的小区切换，可以触发终端设备向第一网络设备发送第二消息。
上述三个条件可以单独用于触发终端设备发送第二消息。也可以结合用于触发终端设备发送第二消息。例如，在同时满足服务小区的信号质量小于或等于第一阈值，以及终端设备能够检测到的候选小区的数量小于或等于第一数量的情况下，触发终端设备发送第二消息。
可选的，第二消息中可以包括终端设备建议删除或增加的候选小区标识。或者第二消息中可以包括部分候选小区的信号质量。
示例性，候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，第二消息用于更新CPA或CPC的配置信息。例如用于请求网络添加或减少候选小区。
即是说，本申请实施例可以应用于图4A～图4C所示的CPA或CPC过程。第一网络设备通过CPAC的配置信息(即CPA的配置信息或CPC的配置信息)向终端设备发送候选主辅小区的配置信息，终端设备接收到后，进行相应的小区测量评估，以便进行主辅小区切换。而当满足上述三个条件中的一个或多个时，触发终端设备向第一网络设备发送第二消息，用于更新CPAC的配置信息。第一网络设备接收到第二消息之后，可以重新确定CPAC的配置信息，例如重新根据第二消息、网络拓扑、网络部署、终端设备当前的位置信息、SN重新上报的自身小区能否作为候选小区等信息确定新的CPAC的配置信息。
示例性，候选小区的配置信息为层1/层2切换的候选小区的配置信息，第一消息用于请求更新层1/层2切换的配置信息。例如用于请求网络添加或减少候选小区。
即是说，本申请实施例可以应用于图5A～图5C所示的L1/L2切换过程。第一网络设备通过L1/L2的预配置信息向终端设备发送候选主小区(或者候选主辅小区)的配置信息，终端设备接收到后，进行相应的小区测量或评估，以便进行小区切换。而当满足上述三个条件中的一个或多个时，触发终端设备向第一网络设备发送第二消息，用于更新L1/L2的预配置信息。第一网络设备接收到第二消息之后，可以重新确定L1/L2的配置信息，例如重新根据第二消息、网络拓扑、网络部署、终端设备当前的位置信息、终端设备上报的测量报告等信息确定新的L1/L2的配置信息。
在接收到网络下发的更新的候选小区的配置信息之前，终端设备继续使用或维护原本的候选小区配置信息。
可见，在本申请实施例中，在满足第一条件的情况下，可以触发终端设备向第一网络设备发送第二消息，用于请求更新候选小区的配置信息。这样通过终端设备主动向网络设备请求更新候选小区的配置信息，能够使得终端设备即时获得最准确的候选小区的配置信息，以便进行小区的切换。提升小区切换成功的概率，同时减少因为无法及时获得有效的候选小区的配置信息造成的小区切换时延。
需要说明的是，本申请实施例可以单独实现，也可以与前述图6A～图6B对应实施例结合实现。也即是说，第一指示信息与候选小区的配置信息都发送给终端设备，终端设备根据第一指示信息执行测量或评估，在满足第一条件的情况下，终端设备发送第二消息，用于请求更新候选小区的配置信息，同时也可以请求更新第一指示信息的内容。终端设备对应的至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，也随着候选小区的配置信息的更新而更新。这样能够使得终端设备在及时获取与当前位置相对应的候选小区的配置信息的同时，也能够获得与这些候选小区对应的第一小区集合。以便终端设备能够进行更加准确和快速的小区测量评估，进一步提升小区切换成功率。
在一些情况下，随着终端设备的位置移动，网络侧为终端设备进行的相关配置不再有效。除了如图7A～图7B对应实施例描述的终端设备请求候选小区的配置信息更新之外，还可以由终端设备向网络设备主动发送测量报告。具体地，请参阅图8，图8为本申请实施例提供的一种通信方法流程图，如图8所示，该方法包括如下步骤：
301、第一网络设备确定候选小区的配置信息。
302、第一网络设备发送第一消息，第一消息包括候选小区的配置信息。
步骤301和步骤302的描述具体可参阅前述步骤201和步骤202的描述，在此不再赘述。
303、终端设备接收第一消息，在满足第二条件的情况下，触发向第一网络设备发送测量报告，测量报告包括候选小区的信号质量。其中，第二条件为服务小区或候选小区的信号质量需要满足的条件，例如 第二条件包括以下至少一种：服务小区的信号质量小于或等于第二阈值；或终端设备能够检测到的候选小区的数量小于或等于第二数量；或候选小区的信号质量小于或等于第三阈值；或服务小区切换为第一小区，第一小区为第二小区集合中的一个；或除候选小区之外的一个或多个小区的信号质量大于或等于第四阈值。
同样地，如前述图7A～图7B的实施例描述的，假设终端设备位置移动，则可能第一网络设备发送的候选小区的配置信息不再适用。这种情况下，终端设备可以向第一网络设备发送测量报告，测量报告中包括部分或全部候选小区的信号质量，还可以包括候选小区之外的小区的信号质量。那么第一网络设备可以根据该测量报告更新候选小区的配置信息。具体例如更新候选小区的执行条件，或者更新候选小区等。
触发终端设备发送测量报告的第二条件可以包括以下一种或多种：
(1)服务小区的信号质量小于或等于第二阈值。
(2)能够检测到的候选小区的数量小于或等于第二数量。
(3)候选小区的信号质量小于或等于第三阈值。
条件(1)～条件(3)的具体描述可参阅前述图7A～图7B的实施例的相关描述。区别只在于图7A～图7B的条件(1)～条件(3)用于触发终端设备向第一网络设备发送第二消息。而本申请实施例中的条件(1)～条件(3)用于触发终端设备向第一网络设备发送测量报告。
(4)服务小区切换为第一小区，第一小区为第二小区集合中的一个。即是说，终端设备切换到了预设的第二小区集合中的第一小区。第二小区集合中的小区属于候选小区，例如第二小区集合中的小区为图7B中的C{8,9}。第二小区集合中的小区也可以是候选小区之外的小区，例如在网络指示终端设备切换到候选小区之外的小区的情况下。服务小区切换到第一小区，可以表征终端设备已经移动到了候选小区信号质量较差的位置，可以触发终端设备向第一网络设备发送测量报告，以便为第一网络设备提供决策参考，例如决策是否更新以及如何更新候选小区的配置信息。第一小区或第二小区集合可以是网络配置的，例如包含在第一消息中。
(5)除候选小区之外的一个或多个小区的信号质量大于或等于第四阈值。终端设备测量到除候选小区之外的一个小区或第四数量的小区的信号质量大于或等于第四阈值，其中第四数量和第四阈值可以是网络配置的或预定义的，例如包含在第一消息中。那么此时终端设备可以触发向第一网络设备发送测量报告，以便终端设备判断是否更新候选小区的配置信息，包括将该一个或多个小区添加为终端设备的候选小区等。
上述条件(1)～条件(5)可以单独用于触发终端设备向第一网络设备发送测量报告，也可以结合用于触发终端设备向第一网络设备发送测量报告。例如同时满足条件(1)、条件(3)和条件(5)时，表示终端设备当前服务小区的信号质量差，同时候选小区的信号质量都很差，但是有其他小区的信号质量较好，此时可以触发终端设备向第一网络设备发送测量报告，以便第一网络设备参考决策是否更新以及如何更新候选小区的配置信息。
可见，在本申请实施例中，在满足第二条件的情况下，可以触发终端设备向第一网络设备发送测量报告，用于第一网络设备参考如何更新候选小区的配置信息。这样通过终端设备主动向网络设备发送测量报告，能够使得网络设备更快更准确地确定更新候选小区的配置信息的方案。进而提升小区切换过程的成功率。
需要说明的是，本申请实施例可以单独实现，也可以与前述图7A～图7B描述的实施例相结合实现。具体地，假设终端设备接收到候选小区的配置信息后，确定终端设备满足图7A～图7B中条件(1)～条件(3)中的一条或多条，同时满足本申请实施例中条件(1)～条件(5)中的一条或多条(其中图7A～图7B中条件(1)～条件(3)和本申请实施例条件(1)～条件(3)可以是对应相同阈值或数量的条件，也可以是对应不同阈值或数量的条件)，那么触发终端设备向第一网络设备发送第二消息和测量报告，用于请求更新候选小区的配置信息，并且终端设备可以向网络设备发送测量报告，以便网络设备根据该测量报告确定具体如何更新候选小区的配置信息。
可见，图7A～图7B对应实施例与图8对应实施例相结合，能够进一步提升网络设备进行候选小区的配置信息更新的效率和准确性，进而提升终端设备根据新的候选小区的配置信息进行小区切换的效率和成功率。
同样的，图8对应实施例可以与前述图6A～图6B对应实施例相结合，具体结合方式可以为触发终端设备向第一网络设备发送测量报告，第一网络设备根据测量报告确定第一指示信息。或者图6A～图6B对应实施例、图7A～图7B对应实施例以及图8对应实施例可以三者进行结合，具体结合方式如前述描述，在此不再赘述。
在一些情况下，终端设备针对接收到的候选小区的配置信息(终端设备获取到候选小区的配置信息的 过程具体可参阅前述实施例步骤201～步骤202)，除了进行有效或保存，也可以进行无效或释放。具体可参阅图9，图9为本申请实施例提供的一种通信方法流程图，该方法包括如下步骤：
401、第一网络设备向终端设备发送第三消息，所述，第三消息用于指示终端设备切换到目标小区，其中目标小区不属于候选小区。第三消息例如为RRC重配消息或切换命令。
402A、终端设备接收第一网络设备发送的第三消息，终端设备切换到第三消息指示的目标小区，将候选小区的配置信息视为有效或保存。
402B、终端设备切换到第三消息指示的目标小区，根据来自第一网络设备的指示信息A确定候选小区的配置信息有效或无效。
其中，步骤402A和步骤402B为可选执行的步骤。
示例性，所述指示信息A可以包括在所述第三消息中。
示例性，在步骤401之前还包括步骤400：第一网设备向终端设备发送所述指示信息A。
本申请实施例中的第一网络设备和终端设备与前述实施例中的含义相同，在此不再赘述。在一些情况下，终端设备可能接收到第一网络设备发送的指示信息，用于指示终端设备从当前的服务小区(源小区)切换到目标小区。例如在CPAC中，服务小区可以为PSCell。在L1/L2切换中，服务小区可以为PCell。第一网络设备可能在检测到有小区满足切换条件的情况下，将该小区作为目标小区，并通过第三消息向终端设备进行指示。
若目标小区属于候选小区，而候选小区的配置信息已经由第一网络设备向终端设备发送了。那么终端设备可以根据候选小区的配置信息，完成目标小区的接入。此时终端设备之前接收到的候选小区的配置信息被认为仍然有效，因此可以对其进行保存或维护等。
若目标小区不属于候选小区，那么此时终端设备无法根据之前接收到的候选项小区的配置信息进行目标小区的接入，可能根据第一网络设备新发送的配置信息完成接入，例如通过第三消息中的配置完成切换。目标小区不属于候选小区，说明可能终端设备的位置发生了移动，或者小区信号等发生了变化，之前的候选小区的配置信息不再适用于终端设备的小区切换。那么此时终端设备可以进行的操作包括：(1)将候选小区的配置信息视为有效或保存。这种情况可能是终端设备认为虽然目前候选小区的配置信息与目标小区不适配，但是可以等待终端设备位置继续移动后者候选小区参数继续变化后，候选小区的配置信息重新确定的目标小区适配。因此依然将候选小区的配置信息视为有效或保存。这样可以减少第一网络设备为终端设备重新发送相同的候选小区的配置信息的概率，节省信令开销，减少时延。(2)根据来自第一网络设备的指示信息确定候选小区的配置信息有效或无效。例如第一指示信息包含在第三消息或候选小区配置所在的消息中。网络设备(例如CU)可以根据目标小区、网络拓扑等确定终端设备切换后是否还能使用候选小区的配置信息。第一网络设备可以采用指示信息明确指示之前发送的候选小区的配置信息是否有效，那么终端设备可以根据第一网络设备的指示信息确定候选小区的配置信息有效或者无效，进一步地，对有效的候选小区的配置信息进行保存，对无效的候选小区的配置信息可以释放。
可见，在本申请实施例中，在满足一定条件时，具体包括网络设备指示的目标小区为候选小区之外的小区时，不同于通常情况下认为终端设备进行小区切换后释放收到的候选小区的配置信息，可以确定候选小区的配置信息有效。这样减少候选小区配置信息的信令开销，节省接收重配置的时延。终端设备也可以根据网络设备发送的指示信息确定候选小区的配置信息有效或无效。这样对候选小区的配置信息的处理更加灵活，避免造成通信冗余或数据存储冗余的同时节省信令开销，降低时延。
在可选的情况下，针对候选小区的配置信息的有效或无效，还包括一种实施例，具体请参阅图10，图10为本申请实施例提供的另一种通信方法流程图，如图10所示，该方法包括如下步骤：
501、第一网络设备向终端设备发送候选小区的配置信息；
502、终端设备触发无线资源管理RRC重建过程，RRC重建过程所选择的小区属于第一网络设备；
示例性的，终端设备检测到与MN的连接发生无线链路故障(Radio Link Failure，RLF)，终端设备将触发RRC重建过程。即终端设备进行小区选择，并在所选择的小区上试图恢复连接。
示例性的，RRC重建过程选择的小区可以为原来的服务小区(包括PCell或PSCell)或属于第一网络设备的其他小区。其中，第一网络设备为原来的服务小区所在的基站或CU。
示例性的，RRC重建过程也可能选择不属于第一网络设备的小区。RRC重建过程中，终端设备根据小区信号质量选择小区，因此选择的小区也可能不属于第一网络设备。
503、终端设备将候选小区的配置信息视为有效或保存。
若RRC重建过程选择的小区为原来的服务小区(包括PCell或PSCell)或属于第一网络设备的其他小 区，终端设备将候选小区的配置信息视为有效或保存。此时因终端设备试图恢复与第一网络设备的连接，那么之前接收到的候选小区的配置信息能够继续使用的可能性很高，终端设备可以将之前接收到的候选小区的配置信息视为有效或保存。其中，候选小区的配置信息包括CPAC过程的CPAC配置，或者L1/L2切换过程中的L1/L2与配置信息等，例如候选小区的配置信息可以为在图4A中CPA配置或图4B中的CPC配置或图5A～5B中的L1/L2预配置信息。该过程能够减少再次进行相同的候选小区的配置信息的传输带来的通信开销，节省重配置的时延。
相对应地，若RRC重建过程选择的小区不属于第一网络设备，终端设备将候选小区的配置信息视为无效或释放。此时终端设备之前接收到的候选小区的配置信息可能不再适配当前的小区切换过程。终端设备将候选小区的配置信息释放、丢弃或视为无效，可以减少终端设备对不适配的候选小区的配置信息进行存储或维护的开销，避免终端设备使用不合适的配置信息。
上述图9和图10对应的实施例可以与前述任意一个或多个实施例结合，并且该两个实施例也可以相互结合。具体结合方式与前述实施例结合方式相同，在此不再赘述。
如图11所示，通信装置600包括收发模块601和处理模块602。通信装置600可用于实现上述图6A、图7A、图8、图9以及图10所示的方法实施例中终端设备或网络设备的功能。
当通信装置600用于实现图6A所述方法实施例中终端设备的功能时：
收发模块601，用于接收第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区；处理模块602，用于根据第一指示信息，终端设备测量第一小区集合中的小区，其中，终端设备的服务小区为第一候选小区。
当通信装置600用于实现图7A所述方法实施例中第一网络设备的功能时：
处理模块602，用于确定第一指示信息，第一指示信息用于指示至少一个候选小区，以及至少一个候选小区中的第一候选小区对应的第一小区集合，第一小区集合包括至少一个小区；收发模块601，用于发送第一指示信息。
当通信装置600用于实现图7A所述方法实施例中终端设备的功能时：
收发模块601，用于接收第一消息，第一消息包括候选小区的配置信息；
所述处理模块602用于在确定满足第一条件的情况下，触发收发模块601向第一网络设备发送第二消息，第二消息用于请求更新候选小区的配置信息，第一条件包括以下至少一种：服务小区的信号质量小于或等于第一阈值；或终能够检测到的候选小区的数量小于或等于第一数量；或候选小区的信号质量小于或等于第二阈值。
当通信装置600用于实现图7A所述方法实施例中第一网络设备的功能时：
处理模块602，用于确定候选小区的配置信息；
收发模块601，用于发送第一消息，第一消息包括候选小区的配置信息；接收模块，用于接收第一消息或测量报告，第一消息用于请求更新候选小区配置信息，测量报告包括候选小区的信号质量。
当通信装置600用于实现图8所述方法实施例中终端设备的功能时：
收发模块601，用于接收第一消息，所述第一消息包括候选小区的配置信息；
处理模块602，用于在确定满足第二条件的情况下，触发所述收发模块601向第一网络设备发送测量报告，所述测量报告包括所述候选小区的信号质量，所述第二条件包括以下至少一种：服务小区的信号质量小于或等于第二阈值；或能够检测到的所述候选小区的数量小于或等于第二数量；或所述候选小区的信号质量小于或等于第三阈值；或所述服务小区切换为第一小区，所述第一小区为第一小区集合中的一个；或除所述候选小区之外的一个或多个小区的信号质量大于或等于第四阈值。
当通信装置600用于实现图8所述方法实施例中第一网络设备的功能时：
处理模块602，用于确定候选小区的配置信息。
收发模块601，用于发送第一消息，所述第一消息包括所述候选小区的配置信息；以及用于接收第一消息或测量报告，所述第一消息用于请求更新所述候选小区配置信息，所述测量报告包括所述候选小区的信号质量。
当通信装置600用于实现图9所述方法实施例中终端设备的功能时：
收发模块601，用于接收第一网络设备发送的第三消息。
处理模块602，用于确定候选小区的配置信息，并切换到第三消息指示的目标小区，将候选小区的配置信息视为有效或保存；或者用于切换到第三消息指示的目标小区，根据来自第一网络设备的指示信息A确定候选小区的配置信息有效或无效。
当通信装置600用于实现图9所述方法实施例中第一网络设备的功能时：
处理模块602，用于确定第三消息，所述第第三消息用于指示终端设备切换到目标小区，其中目标小区不属于候选小区。
收发模块601，用于发送第三消息。
当通信装置600用于实现图10所述方法实施例中终端设备的功能时：
收发模块601，用于接收候选小区的配置信息；
处理模块602，用于触发无线资源管理RRC重建过程，RRC重建过程所选择的小区属于第一网络设备，以及将候选小区的配置信息视为有效或保存。
当通信装置600用于实现图10所述方法实施例中网络设备的功能时：
处理模块602，用于确定候选小区的配置信息。
收发模块601，用于向终端设备发送候选小区的配置信息。
关于上述收发模块601和处理模块602更详细的描述，可参考上述方法实施例中的相关描述，在此不再说明。
如图12所示，图12示出了本申请实施例中的一种通信装置的硬件结构示意图。图11中的装置的结构可以参考图12所示的结构。通信装置1000包括：处理器111和收发器112，所述处理器111和所述收发器112之间电偶合；
所述处理器111，用于执行所述存储器中的部分或者全部计算机程序指令，当所述部分或者全部计算机程序指令被执行时，使得所述装置执行上述任一实施例所述的方法。
收发器112，用于和其他设备进行通信；例如接收来自第一网元的消息，消息中包括组播和/或广播业务的标识，以及，组播和/或广播业务的密钥和/或组播和/或广播业务的密钥标识。
可选的，还包括存储器113，用于存储计算机程序指令，可选的，所述存储器113(存储器#1)位于所述装置内，所述存储器113(存储器#2)与处理器111集成在一起，或者所述存储器113(存储器#3)位于所述装置之外。
应理解，图12所示的通信装置1000可以是芯片或电路。例如可设置在终端装置或者通信装置内的芯片或电路。上述收发器112也可以是通信接口。收发器包括接收器和发送器。进一步地，该通信装置1000还可以包括总线系统。
其中，处理器111、存储器113、收发器112通过总线系统相连，处理器111用于执行该存储器113存储的指令，以控制收发器接收信号和发送信号，完成本申请涉及的实现方法中第一设备或者第二设备的步骤。所述存储器113可以集成在所述处理器111中，也可以与所述处理器111分开设置。
作为一种实现方式，收发器112的功能可以考虑通过收发电路或者收发专用芯片实现。处理器111可以考虑通过专用处理芯片、处理电路、处理器或者通用芯片实现。处理器可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。处理器还可以进一步包括硬件芯片或其他通用处理器。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic，GAL)及其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等或其任意组合。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本申请描述的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例提供了一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行上述实施例中应用于终端设备的方法。
本申请实施例提供了一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行上述实施例中应用于第一网络设备的方法。
本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述实施例中应用于终端设备的方法。
本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述实施例中应用于第一网络设备的方法。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (21)

  1. 一种小区测量方法，其特征在于，所述方法包括：
    终端设备接收第一指示信息，所述第一指示信息用于指示至少一个候选小区，以及所述至少一个候选小区中的第一候选小区对应的第一小区集合，所述第一小区集合包括至少一个小区；
    所述终端设备根据所述第一指示信息，所述终端设备测量所述第一小区集合中的小区，其中，所述终端设备的服务小区为所述第一候选小区。
  2. 根据权利要求1所述的方法，其特征在于，所述至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
  3. 根据权利要求1所述的方法，其特征在于，所述至少一个候选小区为层1/层2切换的至少一个候选主小区。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述第一指示信息用于指示所述至少一个候选小区中的第一候选小区对应的第一小区集合，包括：
    所述第一指示信息通过指示所述至少一个小区的物理小区标识PCI指示所述第一候选小区对应的第一小区集合；或
    所述第一指示信息通过指示所述至少一个小区的配置标识指示所述第一候选小区对应的第一小区集合，其中，所述配置标识与所述至少一个候选小区中的候选小区的配置相关联；或
    所述第一指示信息通过比特映射指示信息指示所述第一候选小区对应的第一小区集合。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述第一小区集合包括的至少一个小区为所述至少一个候选小区中的小区。
  6. 一种小区测量方法，其特征在于，所述方法包括：
    网络设备确定第一指示信息，所述第一指示信息用于指示至少一个候选小区，以及所述至少一个候选小区中的第一候选小区对应的第一小区集合，所述第一小区集合包括至少一个小区；
    所述网络设备发送所述第一指示信息。
  7. 根据权利要求6所述的方法，其特征在于，所述至少一个候选小区为条件主辅小区添加CPA或条件主辅小区变更CPC的至少一个候选主辅小区。
  8. 根据权利要求6所述的方法，其特征在于，所述至少一个候选小区为层1/层2切换的至少一个候选主小区。
  9. 根据权利要求6-8任一项所述的方法，其特征在于，所述第一指示信息用于指示所述至少一个候选小区中的第一候选小区对应的第一小区集合，包括：
    所述第一指示信息通过指示所述至少一个小区的物理小区标识PCI指示所述第一候选小区对应的第一小区集合；或
    所述第一指示信息通过指示所述至少一个小区的配置标识指示所述第一候选小区对应的第一小区集合，其中，所述配置标识与所述至少一个候选小区中的候选小区的配置相关联；或所述第一指示信息通过比特映射指示信息指示所述第一候选小区对应的第一小区集合。
  10. 根据权利要求6-9任一项所述的方法，其特征在于，所述第一小区集合包括的至少一个小区为所述至少一个候选小区中的小区。
  11. 一种通信方法，其特征在于，所述方法包括：
    终端设备接收第一消息，所述第一消息包括候选小区的配置信息；
    在满足第一条件的情况下，所述终端设备向第一网络设备发送第二消息，所述第二消息用于请求更新所述候选小区的配置信息，所述第一条件包括以下至少一种：
    服务小区的信号质量小于或等于第一阈值；或
    所述终端设备能够检测到的所述候选小区的数量小于或等于第一数量；或
    所述候选小区的信号质量小于或等于第二阈值。
  12. 一种通信方法，其特征在于，所述方法包括：
    终端设备接收第一消息，所述第一消息包括候选小区的配置信息；
    在满足第二条件的情况下，所述终端设备触发向第一网络设备发送测量报告，所述测量报告包括所述候选小区的信号质量，所述第二条件包括以下至少一种：
    服务小区的信号质量小于或等于第二阈值；或
    能够检测到的所述候选小区的数量小于或等于第二数量；或
    所述候选小区的信号质量小于或等于第三阈值；或
    所述服务小区切换为第一小区，所述第一小区为第一小区集合中的一个；或
    除所述候选小区之外的一个或多个小区的信号质量大于或等于第四阈值。
  13. 根据权利要求11所述的方法，其特征在于，所述候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，所述第二消息用于更新CPA或CPC的配置信息；或
    所述候选小区的配置信息为层1/层2切换的候选小区的配置信息，所述第二消息用于请求更新层1/层2切换的配置信息。
  14. 根据权利要求11-13任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收第三消息，所述第三消息用于指示所述终端设备切换到目标小区，其中所述目标小区不属于所述候选小区；
    所述终端设备切换到所述目标小区，并执行以下任一项：
    将所述候选小区的配置信息视为有效或保存；或
    根据来自第一网络设备的指示信息确定所述候选小区的配置信息有效或无效。
  15. 根据权利要求11-14任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备触发无线资源管理RRC重建过程，所述RRC重建过程所选择的小区属于所述第一网络设备；
    所述终端设备将所述候选小区的配置信息视为有效或保存。
  16. 一种通信方法，其特征在于，所述方法包括：
    第一网络设备确定候选小区的配置信息；
    所述第一网络设备发送第一消息，所述第一消息包括所述候选小区的配置信息；
    所述第一网络设备接收第一消息或测量报告，所述第一消息用于请求更新所述候选小区配置信息，所述测量报告包括所述候选小区的信号质量。
  17. 根据权利要求16所述的方法，其特征在于，所述候选小区的配置信息为条件主辅小区添加CPA或条件主辅小区变更CPC配置信息，所述第一消息用于请求更新CPA或CPC信配置信息；或
    所述候选小区的配置信息为层1/层2切换的候选小区的配置信息，所述第一消息用于请求更新层1/层2切换的配置信息。
  18. 一种通信装置，其特征在于，包括用于执行如权利要求1至5、6至10、11至15、或16至17中的任一项所述方法的模块。
  19. 一种通信装置，其特征在于，所述装置的结构中包括处理器，还可以包括存储器；处理器与存储器耦合，可用于执行存储器中存储的计算机程序指令，以使装置执行如权利要求1-5或11-15任一项所述的方法，或者执行如权利要求6-10或16-17任一项所述的方法。
  20. 一种可读存储介质，其特征在于，用于存储指令，当所述指令被执行时，使如权利要求1-5或11-15中任一项所述的方法被实现，或者使如权利要求6-10或16-17中任一项所述的方法被实现。
  21. 一种包含指令的计算机程序产品，其特征在于，当所述指令在通信装置上运行时，实现如权利要求1-17中任意一项所述的方法。
PCT/CN2023/105243 2022-07-25 2023-06-30 小区测量方法及装置 WO2024022035A1 (zh)

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