Cell switching method

Abstract

The invention provides a cell switching method, and relates to the technical field of communication. The method comprises: a service distribution unit determining a first execution condition for configuring a cell handover between one or more first candidate cells based on layer 1 measurement triggering, and a concentration unit determining a second execution condition for configuring a cell handover between one or more first candidate cells based on layer 3 measurement triggering, the concentration unit sends a first execution condition, a first measurement configuration, a second execution condition and a second measurement configuration to the terminal device through the service distribution unit, and the terminal device performs layer 1 measurement according to the first measurement configuration and / or performs layer 3 measurement according to the second measurement configuration, and triggering cell handover among the one or more first candidate cells according to the first execution condition and / or the second execution condition. Therefore, the terminal equipment can automatically trigger cell switching through layer 1 measurement and / or layer 3 measurement, and the communication quality of the terminal equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a cell switching method. Background Art

[0002] Cell switching refers to the process of switching a terminal device (UE) from a serving cell to another cell. When the UE moves, the serving cell may not be able to continue to provide services to the UE, so the UE needs to switch to another suitable cell to ensure uninterrupted mobile communication services.

[0003] Currently, cell switching can be performed through the intra-gNB L1 / L2-triggered mobility (LTM) switching method. In the LTM switching method, the base station sends a cell switching command to the UE through a media access control element (MAC CE) message, thereby triggering the UE to switch to the target cell. However, if the UE is currently at the edge of the serving cell, the MAC CE message transmission may fail, and the target cell cannot be switched in time, resulting in a decrease in the communication quality of the UE. Summary of the invention

[0004] The present application provides a cell switching method to solve the problem of decreased communication quality of UE, thereby ensuring that the UE can normally switch to a target cell and improving the communication quality of the UE.

[0005] In a first aspect, the present application provides a cell switching method, comprising:

[0006] The service distribution unit receives first information sent by the centralized unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device;

[0007] The service distribution unit determines, according to the first information, a first execution condition, where the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement;

[0008] The service distribution unit sends second information to the central unit, wherein the second information includes a first execution condition;

[0009] The service distribution unit receives third information sent by the central unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes the first execution condition and the first measurement configuration, and the second configuration information includes a second execution condition and a second measurement configuration;

[0010] The service distribution unit sends the third information to the terminal device, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition;

[0011] The second execution condition is determined by the centralized unit according to the second measurement configuration, and the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement.

[0012] In one possible design, the method further includes:

[0013] The service distribution unit receives fourth information sent by the central unit, where the fourth information includes a layer 3 measurement report, where the layer 3 measurement report is used to indicate a result of layer 3 measurement performed by the terminal device;

[0014] The service distribution unit determines the first execution condition according to the first information and the layer 3 measurement report.

[0015] In one possible design, the method further includes:

[0016] The service distribution unit updates the first execution condition according to a layer 1 measurement report, where the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device;

[0017] The service distribution unit sends fifth information to the terminal device, and the fifth information is transmitted through the medium access control MAC layer. The fifth information carries the updated first execution condition, or the service distribution unit forwards the updated first execution condition to the terminal device through a radio resource control RRC layer message, so that the terminal device triggers cell switching in the one or more first candidate cells according to the updated first execution condition.

[0018] In one possible design, the service distribution unit forwards the updated first execution condition to the terminal device through a radio resource control RRC layer message, including:

[0019] The service distribution unit sends the updated first execution condition to the central unit;

[0020] The service distribution unit receives the radio resource control RRC information sent by the centralized unit through the radio resource control RRC layer, wherein the radio resource control RRC information includes the updated first execution condition;

[0021] The service distribution unit sends the radio resource control RRC information to the terminal device through the radio resource control RRC layer.

[0022] In one possible design, the first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

[0023] In one possible design, the second information also includes a third execution condition, and the third execution condition is used to configure the terminal device to trigger a cell switching between one or more second candidate cells based on layer 1 measurement, the one or more second candidate cells allow the terminal device to access, and the one or more second candidate cells are different from the one or more first candidate cells. The third execution condition is determined by the service distribution unit according to a third measurement configuration, and the third measurement configuration is used to indicate that the one or more second candidate cells can be used for synchronization signal blocks or channel state information reference signals for layer 1 measurement, and the third measurement configuration is determined by the centralized unit; the third information also includes third configuration information, and the third configuration information includes the third execution condition and a third measurement configuration, so that the terminal device can also perform layer 1 measurement according to the third measurement configuration, and trigger cell switching in the one or more second candidate cells according to the third execution condition.

[0024] In one possible design, the third information also includes a fourth execution condition, where the fourth execution condition is used to configure the terminal device to trigger cell switching between one or more fourth candidate cells based on layer 3 measurement, and the fourth execution condition is determined by the centralized unit according to a fourth measurement configuration, and the fourth measurement configuration is used to indicate that the one or more fourth candidate cells can be used for layer 3 measurement. The synchronization signal block or channel state information reference signal, or the channel state information reference signal, is determined by the centralized unit; the third information also includes fourth configuration information, and the fourth configuration information includes the fourth execution condition and the fourth measurement configuration, so that the terminal device can also perform layer 3 measurement according to the fourth measurement configuration, and trigger cell switching in the one or more fourth candidate cells according to the fourth execution condition.

[0025] In a second aspect, the present application provides a cell switching method, including:

[0026] The centralization unit sends first information to the service distribution unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device;

[0027] The central unit receives second information sent by the service distribution unit, where the second information includes a first execution condition, where the first execution condition is determined by the service distribution unit according to the first information, and the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement;

[0028] The centralized unit determines, according to the second measurement configuration, a second execution condition, where the second execution condition is used to configure a condition for triggering, by the terminal device, a cell switching between the one or more first candidate cells based on layer 3 measurement, where the second measurement configuration is used to indicate a synchronization signal block or a channel state information reference signal corresponding to the one or more first candidate cells that can be used for layer 3 measurement;

[0029] The centralized unit sends third information to the service distribution unit, the third information including first configuration information and second configuration information, the first configuration information including the first execution condition and the first measurement configuration, the second configuration information including the second execution condition and the second measurement configuration, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition.

[0030] In one possible design, the method further includes:

[0031] The centralized unit sends fourth information to the service distribution unit, the fourth information including a layer 3 measurement report, the layer 3 measurement report being used to indicate a result of layer 3 measurement performed by the terminal device, so that the service distribution unit determines the first execution condition according to the first information and the layer 3 measurement report.

[0032] In one possible design, the method further includes:

[0033] The centralized unit sends sixth information to the first distributed unit, the sixth information is used to indicate a third candidate cell, the sixth information is used to request that the third candidate cell be configured as a conditional switching cell, the third candidate cell is determined according to a layer 3 measurement report, the layer 3 measurement report is sent by the terminal device to the centralized unit through the service distributed unit, and the first distributed unit includes one or more distributed units corresponding to the third candidate cell;

[0034] The centralized unit receives seventh information sent by the second distributed unit, where the seventh information is used to indicate a first candidate cell, and the seventh information is used to respond that the first candidate cell can be configured as a conditional switching cell, the second distributed unit is part or all of the distributed units in the first distributed unit, and the first candidate cell is a cell in the second distributed unit that allows terminal devices to access.

[0035] In a possible design, the sixth information is carried in a terminal device context setup request UE CONTEXT SETUP REQUEST, and the seventh information is carried in a terminal device context setup response UE CONTEXT SETUPRESPONSE.

[0036] In one possible design, the first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

[0037] In one possible design, the second information also includes a third execution condition, and the third execution condition is used to configure the terminal device to trigger a cell switching between one or more second candidate cells based on layer 1 measurement, the one or more second candidate cells allow the terminal device to access, and the one or more second candidate cells are different from the one or more first candidate cells. The third execution condition is determined by the service distribution unit according to a third measurement configuration, and the third measurement configuration is used to indicate that the one or more second candidate cells can be used for synchronization signal blocks or channel state information reference signals for layer 1 measurement, and the third measurement configuration is determined by the centralized unit; the third information also includes third configuration information, and the third configuration information includes the third execution condition and a third measurement configuration, so that the terminal device can also perform layer 1 measurement according to the third measurement configuration, and trigger cell switching in the one or more second candidate cells according to the third execution condition.

[0038] In one possible design, the third information also includes a fourth execution condition, where the fourth execution condition is used to configure the terminal device to trigger cell switching between one or more fourth candidate cells based on layer 3 measurement, and the fourth execution condition is determined by the centralized unit according to a fourth measurement configuration, and the fourth measurement configuration is used to indicate that the one or more fourth candidate cells can be used for layer 3 measurement. The synchronization signal block or channel state information reference signal, or the channel state information reference signal, is determined by the centralized unit; the third information also includes fourth configuration information, and the fourth configuration information includes the fourth execution condition and the fourth measurement configuration, so that the terminal device can also perform layer 3 measurement according to the fourth measurement configuration, and trigger cell switching in the one or more fourth candidate cells according to the fourth execution condition.

[0039] In a third aspect, the present application provides a cell switching method, including:

[0040] The terminal device receives third information sent by the service distribution unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes a first execution condition and a first measurement configuration, and where the second configuration information includes a second execution condition and a second measurement configuration;

[0041] The terminal device performs layer 1 measurement according to the first measurement configuration, and / or performs layer 3 measurement according to the second measurement configuration;

[0042] The terminal device triggers a cell handover in one or more first candidate cells according to the first execution condition and / or the second execution condition;

[0043] Among them, the second execution condition is determined by the centralized unit according to the second measurement configuration, the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement; the third information is sent by the centralized unit to the service distribution unit; the first execution condition is sent by the service distribution unit to the centralized unit through the second information, the first execution condition is determined by the service distribution unit according to the first information, the first execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 1 measurement, the first information is sent by the centralized unit to the service distribution unit, the first information includes first indication information and first measurement configuration, the first indication information is used to indicate one or more first candidate cells allowed to be accessed by the terminal device, the first measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device.

[0044] In one possible design, the method further includes:

[0045] The terminal device receives fifth information sent by the service distribution unit, where the fifth information is transmitted through a medium access control MAC layer, and the fifth information carries the updated first execution condition, or the terminal device receives the updated first execution condition forwarded by the service distribution unit through a radio resource control RRC layer message;

[0046] The terminal device triggers a cell handover in the one or more first candidate cells according to the updated first execution condition;

[0047] The updated first execution condition is determined by the service distribution unit according to a layer 1 measurement report, wherein the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device.

[0048] In one possible design, the first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

[0049] In one possible design, the second information also includes a third execution condition, and the third execution condition is used to configure the terminal device to trigger a cell switching between one or more second candidate cells based on layer 1 measurement, the one or more second candidate cells allow the terminal device to access, and the one or more second candidate cells are different from the one or more first candidate cells. The third execution condition is determined by the service distribution unit according to a third measurement configuration, and the third measurement configuration is used to indicate that the one or more second candidate cells can be used for synchronization signal blocks or channel state information reference signals for layer 1 measurement, and the third measurement configuration is determined by the centralized unit; the third information also includes third configuration information, and the third configuration information includes the third execution condition and a third measurement configuration, so that the terminal device can also perform layer 1 measurement according to the third measurement configuration, and trigger cell switching in the one or more second candidate cells according to the third execution condition.

[0050] In one possible design, the third information also includes a fourth execution condition, where the fourth execution condition is used to configure the terminal device to trigger cell switching between one or more fourth candidate cells based on layer 3 measurement, and the fourth execution condition is determined by the centralized unit according to a fourth measurement configuration, and the fourth measurement configuration is used to indicate that the one or more fourth candidate cells can be used for layer 3 measurement. The synchronization signal block or channel state information reference signal, or the channel state information reference signal, is determined by the centralized unit; the third information also includes fourth configuration information, and the fourth configuration information includes the fourth execution condition and the fourth measurement configuration, so that the terminal device can also perform layer 3 measurement according to the fourth measurement configuration, and trigger cell switching in the one or more fourth candidate cells according to the fourth execution condition.

[0051] In a fourth aspect, the present application provides a communication device, comprising: a module for executing the cell switching method in the above-mentioned first aspect and any possible design of this aspect.

[0052] In a fifth aspect, the present application provides a communication device, comprising: a module for executing the cell switching method in the above-mentioned second aspect and any possible design of this aspect.

[0053] In a sixth aspect, the present application provides a communication device, comprising: a module for executing the cell switching method in the above-mentioned third aspect and any possible design of this aspect.

[0054] In the seventh aspect, the present application provides a communication system, comprising: a first network device and a terminal device, the first network device including a centralized unit and a service distribution unit for executing the cell switching method in the first aspect and any possible design of the aspect; or, comprising: a first network device and a terminal device, the first network device including a service distribution unit and a centralized unit for executing the cell switching method in the second aspect and any possible design of the aspect; or, comprising: a first network device and a terminal device for executing the cell switching method in the third aspect and any possible design of the aspect, the first network device including a centralized unit and a service distribution unit.

[0055] In an eighth aspect, the present application provides a communication device, the communication device comprising a processor. The processor is used to call a computer program or computer instruction stored therein, so that the processor implements a method in any possible design of any one of the first to third aspects.

[0056] Optionally, the communication device further includes a transceiver, and the processor is used to control the transceiver to send and receive signals.

[0057] In a ninth aspect, the present application provides a communication device, the communication device comprising at least one memory and at least one processor. The memory is used to store computer executable programs or instructions. The processor is used to call the computer executable program or instructions in the memory so that the communication device executes the method in any possible design of any one of the first to third aspects.

[0058] Optionally, the processor is coupled to the memory via an interface.

[0059] In the tenth aspect, the present application provides a computer-readable storage medium having stored thereon a computer-executable program or instructions, which, when executed by a processor, enables a communication device to implement a method in any possible design of any one of the first to third aspects.

[0060] In the eleventh aspect, the present application provides a chip, comprising: an interface circuit and a logic circuit, the interface circuit being used to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip, and the logic circuit being used to implement the method in any possible design in any one of the first to third aspects.

[0061] In the twelfth aspect, the present application provides a computer program product, including: execution instructions, the execution instructions are stored in a readable storage medium, at least one processor of a communication device can read the execution instructions from the readable storage medium, and at least one processor executes the execution instructions so that the communication device implements a method in any possible design of any one of the first to third aspects.

[0062] In the present application, by configuring one or more first candidate cells, as well as first configuration information and second configuration information for the terminal device, the terminal device can perform layer 1 measurement on the first candidate cell based on the first measurement configuration in the first configuration information, and perform layer 3 measurement on the first candidate cell based on the second measurement configuration in the second configuration information, and obtain layer 1 measurement results and layer 3 measurement results respectively. When the layer 1 measurement result / layer 3 measurement result triggers the event indicated in the first execution condition / second execution condition, the terminal device triggers cell switching. Based on this, there is no need for the source base station corresponding to the terminal device to issue a cell switching command, but the terminal device triggers the cell switching according to the first execution condition or the second execution condition, thereby avoiding the failure of the cell switching command transmission, improving the success rate of the cell switching, thereby ensuring that the terminal device can switch to the target cell normally, and improving the communication quality of the terminal device. In addition, the terminal device can trigger the cell switching through layer 1 measurement or layer 3 measurement, thereby reducing the switching delay and further improving the communication quality of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A signaling interaction diagram of an LTM cell switching method provided in an embodiment of the present application.

[0064] Figure 2 A signaling interaction diagram of a CHO cell switching method provided in an embodiment of the present application.

[0065] Figure 3 A schematic diagram of the architecture of a communication system provided in one embodiment of the present application.

[0066] Figure 4 A signaling interaction diagram of a cell switching method provided in one embodiment of the present application.

[0067] Figure 5 A signaling interaction diagram of a method for determining a first execution condition provided in an embodiment of the present application.

[0068] Figure 6 A signaling interaction diagram of a method for updating a first execution condition provided in an embodiment of the present application.

[0069] Figure 7 A signaling interaction diagram of a method for sending an updated first execution condition provided in an embodiment of the present application.

[0070] Figure 8 A signaling interaction diagram of a method for determining a first candidate cell provided in an embodiment of the present application.

[0071] Fig. 9 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0072] Fig.10 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0073] Fig.11 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0074] Fig.12 A schematic diagram of the hardware structure of a communication device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0075] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0076] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0077] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In the related art, there are multiple methods for performing cell switching.

[0079] Mode 1, LTM cell switching method. This method is applicable to switching between cells within a source base station. The source base station includes a centralized unit (CU) and multiple service distribution units (DU), each DU includes one or more cells. Multiple DUs are connected to the CU respectively, and the multiple DUs are independent of each other.

[0080] The cell currently providing service to the UE is the serving cell, and the DU to which the serving cell belongs is the serving DU of the source base station. The base station to which the serving cell belongs is the source base station. Figure 1 As shown, the LTM cell switching method may include the following steps:

[0081] S11. The UE sends a layer 3 (L3) measurement report to the serving DU.

[0082] Correspondingly, the serving DU receives the L3 measurement report sent by the UE.

[0083] S12. The serving DU sends an L3 measurement report to the CU of the source base station.

[0084] Correspondingly, the CU of the source base station receives the L3 measurement report sent by the service DU.

[0085] S13. The CU of the source base station sends a UE context setting request to the first candidate DU.

[0086] Correspondingly, the first candidate DU receives the UE context setup request sent by the CU of the source base station.

[0087] The UE context setting request includes an identity document (ID) of a first cell and channel state information (CSI) resource configuration information.

[0088] The first candidate DU is the DU corresponding to the first cell. When there are multiple first cells, there are also multiple first candidate DUs, and the CU of the source base station sends a UE context setting request to the first candidate DU to which the first cell belongs.

[0089] S14. The second candidate DU sends a UE context setup response to the CU of the source base station.

[0090] Correspondingly, the CU of the source base station receives the UE context setup response sent by the second candidate DU.

[0091] The UE context setting response includes an underlying radio resource control (RRC) configuration generated for the second cell. The second cell is a cell in the first cell that the UE is allowed to access. The second candidate DU is a DU to which the second cell belongs.

[0092] The second cell is a cell capable of LTM cell switching, and may also be referred to as an LTM cell.

[0093] It should be noted that if the DU to which the first cell belongs is a service DU, there is no need to execute S13 to S14.

[0094] S15. The CU of the source base station sends a UE context modification request to the serving DU.

[0095] Correspondingly, the service DU receives the UE context modification request sent by the CU of the source base station.

[0096] The UE context modification request includes an LTM configuration ID mapping list, early synchronization related information, and may include an updated CSI resource configuration.

[0097] S16. The serving DU sends a UE context modification response to the CU of the source base station.

[0098] Correspondingly, the CU of the source base station receives the UE context modification response sent by the service DU.

[0099] The UE context modification response includes the updated underlying RRC configuration.

[0100] S17. The CU of the source base station sends a downlink radio resource control message transfer (DL RRC MESSAGE TRANSFER) message to the serving DU.

[0101] Correspondingly, the service DU receives the downlink RRC message transmission message sent by the CU of the source base station.

[0102] The downlink RRC message transmission message includes an RRC reconfiguration message configured by the second cell.

[0103] S18. The serving DU sends an RRC reconfiguration message to the UE.

[0104] S19. UE initiates downlink synchronization and uplink synchronization.

[0105] S110. The UE sends an L1 measurement report to the serving DU.

[0106] The L1 measurement report includes the L1 measurement result.

[0107] The UE performs layer 1 (L1) measurement on the second cell to obtain an L1 measurement result. The UE needs to perform the L1 measurement during the period when the above RRC reconfiguration message is effective.

[0108] S111. The serving DU determines the target cell based on the L1 measurement report, decides to start cell switching, and sends a MAC CE message to the UE.

[0109] S112. The UE switches to the target cell based on the MAC CE message.

[0110] Method 2: Conditional handover (CHO) cell handover method. This method is applicable to cell handover between different base stations. Figure 2 As shown, the method includes:

[0111] S21. The source base station configures a UE measurement process.

[0112] S22. The UE performs measurement reporting according to the measurement configuration.

[0113] S23. The source base station sends a handover request to the candidate base station.

[0114] Correspondingly, the candidate base station receives the handover request sent by the source base station.

[0115] The candidate base station is a base station corresponding to the candidate cell.

[0116] S24. The candidate base station sends an access grant message to the source base station.

[0117] Correspondingly, the source base station sends an access grant message to the candidate base station.

[0118] The access grant message includes the configuration of the candidate cell.

[0119] S25. The source base station sends an RRC reconfiguration message to the UE.

[0120] Correspondingly, the UE receives the RRC reconfiguration message sent by the source base station.

[0121] The RRC reconfiguration message includes the configuration CHO execution condition of the candidate cell, and the CHO execution condition is obtained through the L3 measurement result.

[0122] S26. The UE sends an RRC reconfiguration completion message to the source base station.

[0123] Correspondingly, the source base station receives the RRC reconfiguration completion message sent by the UE.

[0124] S27. The UE determines a target cell according to the CHO execution condition and initiates random access to the target cell.

[0125] In the above method 1, the serving DU decides to initiate a cell handover and triggers the cell handover through a MAC CE message. However, if the UE moves to the edge of the serving cell, the cell handover-related command initiated by the serving DU to the UE may fail to be transmitted, resulting in the UE being unable to switch to the target cell in time.

[0126] In the above method 2, although it is the UE that decides to initiate the cell handover, L3 measurement needs to be performed and the L3 measurement result needs to be obtained when the cell handover is performed. Since it takes a long filtering time to obtain the L3 measurement result, the handover delay is increased. After the UE initiates the cell handover when the CHO execution condition is met, the UE also needs to initiate random access to the target cell, which introduces communication interruption time.

[0127] Based on this, the present application provides a cell switching method, a communication device, a computer storage medium, a computer program product and a chip. By configuring the execution conditions based on L1 measurement and the execution conditions based on L3 measurement for the UE at the same time, the UE can initiate the cell switching based on the L1 measurement results and the L3 measurement results at the same time, thereby avoiding the possibility of failure of the cell switching initiated by the source base station, thereby reducing the switching delay and improving the communication quality.

[0128] Next, combine Figure 3 , describes in detail the application scenarios of the cell switching method provided in the embodiments of the present application.

[0129] See also Figure 3 , Figure 3 This is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application. Figure 3 As shown, the communication system 1 of the present application may include: a first network device 10 and a UE 20 .

[0130] The first network device 10 is a network device currently accessed by the UE 20 , and the first network device 10 can provide communication services for the UE 20 .

[0131] The first network device 10 includes a CU and multiple DUs, the CU is connected to the multiple DUs respectively, and the DUs are independent of each other. Figure 3 The example in which the first network device includes three DUs is used for illustration. The present application does not limit the number of DUs included in the first network device 10.

[0132] For each DU, the DU includes one or more cells.

[0133] Among them, the first network device 10 provides business services for UE20 through the service DU corresponding to the service cell.

[0134] The serving cell is the cell currently accessed by the UE 20 .

[0135] UE 20 may perform cell switching between one or more cells corresponding to the multiple DUs.

[0136] After the UE 20 successfully performs cell switching and switches to the target cell, the first network device 10 may provide business services for the UE 20 through the DU corresponding to the target cell.

[0137] The first network device 10 may be a base station, an access point, or an access network device, or may refer to a device in an access network that communicates with a wireless terminal through one or more sectors on an air interface. The network device may be used to convert received air frames to and from IP packets, and serve as a router between the wireless terminal and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) network. The network device may also coordinate attribute management of the air interface. For example, the network device can be a satellite, a drone, a base station (base transceiver station, BTS) in global system of mobile communication (GSM) or code division multiple access (CDMA), a base station (NodeB, NB) in wideband code division multiple access (WCDMA), an evolved base station (eNB or eNodeB) in long term evolution (LTE), or a terminal or relay station or access point that performs the base station function in V2X (vehicular to everything), device-to-device (D2D), and machine-to-machine (M2M) communications, or a base station in a 5G network, such as gNB, or a base station in a future 6G network, but is not limited here.

[0138] Among them, UE 20 can be user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. UE 20 may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a 5G mobile communication system, a terminal device in a 6G mobile communication system, or a terminal device in a future mobile communication system, etc. In addition, UE 20 may also be a terminal device in an Internet of Things (IoT) system.

[0139] Based on the above description, the following embodiments of the present application will be described in detail. Figure 3 Taking the communication system of the shown structure as an example, the cell switching method provided in the embodiment of the present application is described in detail in combination with the accompanying drawings.

[0140] See also Figure 4 , Figure 4 A signaling interaction diagram of a cell switching method provided in one embodiment of the present application.

[0141] exist Figure 4 In the embodiment, the service DU may be Figure 3 The DU and CU in the first network device 10 may be Figure 3 The CU in the first network device 10, the UE may be Figure 3 UE 20 in.

[0142] like Figure 4 As shown, the method includes:

[0143] S101. CU sends first information to serving DU.

[0144] Correspondingly, the service DU receives the first information sent by the CU.

[0145] The first information includes first indication information and first measurement configuration.

[0146] The first indication information is used to indicate one or more first candidate cells that the UE is allowed to access.

[0147] The service distribution unit is a distribution unit that currently provides services to the terminal device.

[0148] The first candidate cell is a cell that can be used for cell switching by the UE.

[0149] The following introduces multiple ways to determine the first candidate cell.

[0150] As a feasible implementation manner, the first candidate cell may be determined by the CU.

[0151] Specifically, the CU can preliminarily determine the first cell that can be used for cell switching through the L3 measurement report. The L3 measurement report is obtained by the UE performing L3 measurement on the neighboring cell of the serving cell. The L3 measurement report includes the L3 measurement result. The UE will report the L3 measurement report to the CU through the serving DU.

[0152] The CU may determine the cell with the best L3 measurement result as the third cell, or determine all cells with L3 measurement results greater than a threshold value as the third cell.

[0153] For the third cell, if all the third cells are cells of the service DU, the CU can directly determine the third cell as the first candidate cell. If the third cell includes a fourth cell belonging to other DUs under the CU except the service DU, the CU can ask other DUs whether the fourth cell allows UE access through a UE CONTEXT SETUP REQUEST message. If other DUs allow UE access, the UE CONTEXT SETUP RESPONSE message indicates to the CU the cells in the fourth cell that allow UE access. The CU can determine the cells in the fourth cell that allow UE access and the cells in the third cell that belong to the service DU, or the cells in the fourth cell that allow UE access, or the cells in the third cell that belong to the service DU, as the first candidate cell.

[0154] As another feasible implementation manner, the CU may determine the first candidate cell based on the LTM cell.

[0155] Specifically, in the existing LTM cell switching process, the CU will configure the LTM cell for LTM cell switching. Further, the CU may configure the LTM cell as the first candidate cell.

[0156] In addition, the CU may also determine a part of candidate cells according to the L3 measurement report, determine another part of candidate cells based on the LTM cells, and determine the two parts of candidate cells together as the first candidate cells.

[0157] As another feasible implementation manner, the first candidate cell may be determined by the serving DU.

[0158] Specifically, in the existing LTM cell switching process, the CU will configure an LTM cell for LTM cell switching and indicate the LTM cell to the serving DU. Further, the serving DU may determine the LTM cell as the first candidate cell.

[0159] In some examples, the first indication information includes a cell ID corresponding to each of the one or more first candidate cells, and the CU can indicate the first candidate cell to the serving DU through the cell ID.

[0160] The first measurement configuration is used to indicate a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) corresponding to one or more first candidate cells and can be used for L1 measurement.

[0161] There are multiple ways to determine the first measurement configuration.

[0162] As a feasible implementation method, based on the above method of determining the first candidate cell by the CU, if the third cells are all cells of the serving DU, the CU can send CSI resource configuration information to the serving DU, and the serving DU generates SSB or CSI-RS for L1 measurement for the third cell according to the CSI resource configuration information.

[0163] If the third cell includes a fourth cell of other DUs belonging to the CU except the service DU, the CU may send CSI resource configuration information to the DU corresponding to the fourth cell through a UE CONTEXT SETUP REQUEST message. If other DUs determine that the fourth cell allows UE access, the other DUs indicate to the CU the SSB or CSI-RS corresponding to the fourth cell that can be used for L1 measurement through a UE CONTEXT SETUP RESPONSE message.

[0164] As another feasible implementation method, if the CU determines the first candidate cell based on the LTM cell, or the service DU determines the first candidate cell, the CU can reuse the SSB or CSI-RS configured for the LTM cell during the LTM cell switching process that can be used for L1 measurement, and determine this part of the SSB or CSI-SB as the first measurement configuration.

[0165] There are multiple forms of SSB or CSI-RS indicated in the first measurement configuration.

[0166] In some examples, the first measurement configuration includes an SSB or CSI-RS corresponding to a first candidate cell, that is, an available SSB or CSI-RS is configured for each first candidate cell.

[0167] In other examples, the first measurement configuration includes SSBs or CSI-RSs corresponding to one or more first candidate cells, that is, available SSBs or CSI-RSs are jointly configured for one or more first candidate cells.

[0168] The CU may indicate to the serving DU the SSB or CSI-RS of one or more first candidate cells that can be used for L1 measurement by indicating an SSB index or a CSI-RS index.

[0169] In addition, in some examples, the first information also includes early synchronization information. The early synchronization information is used for the UE to perform early synchronization, and the serving DU can forward the early synchronization information to the UE so that the UE can initiate early synchronization.

[0170] Based on this, the CU determines one or more first candidate cells, and indicates the first candidate cells to the serving DU through the first information, so that the serving DU knows which cells can be used for cell switching and the CSI resources corresponding to these cells that can be used for measurement.

[0171] S102: The service DU determines a first execution condition according to the first information.

[0172] The first execution condition is used to configure a condition for the UE to trigger a cell switching between one or more first candidate cells based on L1 measurement.

[0173] Based on the provisions of the 3rd generation partnership project (3GPP) protocol, the configuration for UE to perform cell switching based on L1 measurement is determined by the service DU. Based on this, after the service DU receives the first information, the service DU can generate a first execution condition for one or more first candidate cells based on the first information.

[0174] The first execution condition is an execution condition triggered by an event based on L1 measurement.

[0175] For example, the service DU may configure the event triggering cell switching based on L1 measurement, as well as parameters corresponding to the triggering event, measurement parameters, values ​​corresponding to the measurement parameters, etc. in the first execution condition.

[0176] Among them, the trigger event is, for example, an A3 event and an A5 event. The parameters corresponding to the trigger event include, for example, a measurement trigger quantity offset, hysteresis, time to trigger (TTT), etc. The measurement parameters are, for example, reference signal receiving quality (RSRQ), reference signal receiving power (RSRP), and signal to interference plus noise ratio (SINR).

[0177] Based on this, the serving DU generates a first execution condition for the UE, so that the UE can trigger cell switching by itself based on the first execution condition according to the L1 measurement.

[0178] For example, when a parameter indicated by a measurement result obtained by the UE based on L1 measurement satisfies an event in the first execution condition, the UE can trigger a cell handover.

[0179] S103. The serving DU sends second information to the CU.

[0180] Correspondingly, the CU receives the second information sent by the service DU.

[0181] The second information includes the first execution condition.

[0182] Since the first execution condition needs to be configured to the UE through an RRC layer message, after generating the first execution condition, the serving DU needs to send the first execution condition to the CU, which integrates it and indicates it to the UE through an RRC layer message.

[0183] When the first candidate cell includes the fifth cell belonging to the service DU, the service DU needs to determine whether the fifth cell allows the UE to access. Specifically, the service DU can determine whether the fifth cell allows the UE to access based on the current network load or the network load in the future, and the attributes of the fifth cell. The attributes of the fifth cell are, for example, whether the fifth cell is a dedicated cell.

[0184] Based on this, the service DU eliminates the measurement configuration corresponding to the cell that the UE is not allowed to access in the first measurement configuration, and sends the measurement configuration corresponding to the remaining cell that the UE is allowed to access to the CU, avoiding indicating the measurement configuration that the UE is not allowed to access to the UE, thereby saving measurement resources and improving the accuracy of cell switching.

[0185] S104. The CU determines a second execution condition according to the second measurement configuration.

[0186] The second execution condition is used to configure a condition for the UE to trigger a cell switching between one or more first candidate cells based on L3 measurement.

[0187] The second measurement configuration is used to indicate SSBs and CSI-RSs corresponding to one or more first candidate cells that can be used for L3 measurement.

[0188] The second measurement configuration may be a measurement configuration configured by the CU for the UE to perform L3 measurement when the UE initially accesses the service DU.

[0189] The second execution condition is an execution condition triggered by an event based on L3 measurement.

[0190] For example, the CU may configure the event that triggers cell switching based on L3 measurement, as well as parameters and measurement values ​​corresponding to the triggering event, in the second execution condition.

[0191] The trigger event is, for example, an A3 event or an A5 event. The parameters corresponding to the trigger event include, for example, a measurement trigger quantity offset, hysteresis, time to trigger (TTT), threshold, etc. The measurement parameters are, for example, RSRQ, RSRP, and SINR, etc.

[0192] Based on this, the CU generates a second execution condition for the UE, so that the UE can trigger cell switching by itself based on the second execution condition according to the L3 measurement.

[0193] For example, when a parameter indicated by a measurement result obtained by the UE based on L3 measurement satisfies an event in the second execution condition, the UE can trigger a cell handover.

[0194] It should be noted that S104 may be executed after S102 or before S102. Of course, S104 may also be executed simultaneously with S102, that is, the CU determines the second execution condition and the service DU determines the first execution condition and may be executed simultaneously or sequentially. Figure 4 What is shown is the situation where S104 is executed after S102, and this application does not limit this.

[0195] S105. The CU sends third information to the serving DU.

[0196] Correspondingly, the service DU receives the third information sent by the CU.

[0197] The third information includes the first configuration information and the second configuration information.

[0198] The first configuration information includes a first execution condition and a first measurement configuration.

[0199] The second configuration information includes a second execution condition and a second measurement configuration.

[0200] In some examples, the third information may be carried in a downlink RRC message transfer (DL RRC MESSAGETRANSFER) message. Based on this, the CU may transmit the first configuration information and the second configuration information to the serving DU via an RRC message.

[0201] S106. The serving DU sends third information to the UE.

[0202] Correspondingly, the UE receives the third information sent by the service DU.

[0203] In some examples, the third information may be carried in an RRC Reconfiguration message.

[0204] After receiving the third information, the serving DU may forward the third information to the UE through an RRC reconfiguration message, so that the UE acquires the first configuration information and the second configuration information to facilitate measurement and cell switching.

[0205] The UE may also send an RRC reconfiguration complete message (RRC ReconfigurationComplete) to the CU through the serving DU to ensure that the CU is informed that the UE has completed the cell switching.

[0206] In addition, after S106, the UE may initiate early synchronization between first candidate cells based on the early synchronization information to facilitate subsequent cell switching.

[0207] S107. The UE performs L1 measurement according to the first measurement configuration and / or performs L3 measurement according to the second measurement configuration, and triggers cell switching in one or more first candidate cells according to the first execution condition and / or the second execution condition.

[0208] After the UE receives the first configuration information and the second configuration information, the UE may perform L1 measurement on the first candidate cell based on the resources indicated in the first measurement configuration to obtain a corresponding L1 measurement result. The UE may also perform L3 measurement on the first candidate cell based on the resources indicated in the second measurement configuration to obtain a corresponding L3 measurement result.

[0209] The UE determines whether to trigger the corresponding event in the first execution condition or the second execution condition according to the L1 measurement result and the L3 measurement result, as well as the first execution condition and the second execution condition. If the event is successfully triggered, the UE can determine that the first candidate cell that triggers the event is the target cell, and disconnect from the serving cell to perform cell switching to the target cell. After the UE determines the target cell, if the UE obtains the time advance (TA) of the target cell, the UE can initiate random access to the target cell, thereby switching to the target cell.

[0210] In an embodiment of the present application, by configuring one or more first candidate cells, as well as first configuration information and second configuration information for the UE, the UE can perform L1 measurement on the first candidate cell based on the first measurement configuration in the first configuration information, and perform L3 measurement on the first candidate cell based on the second measurement configuration in the second configuration information, and obtain L1 measurement results and L3 measurement results respectively. When the L1 measurement result / L3 measurement result triggers the event indicated in the first execution condition / second execution condition, the UE triggers cell switching. Based on this, there is no need for the source base station corresponding to the UE to issue a cell switching command, but the UE triggers the cell switching according to the first execution condition or the second execution condition, thereby avoiding the failure of the cell switching command transmission, improving the success rate of the cell switching, thereby ensuring that the UE can switch to the target cell normally, and improving the communication quality of the UE. In addition, the UE can trigger the cell switching through L1 measurement or L3 measurement, thereby reducing the switching delay and further improving the communication quality of the UE.

[0211] Based on the above exemplary description, in S101, the first information further includes an LTM configuration ID mapping list.

[0212] The LTM configuration ID mapping list includes the cell IDs of one or more first candidate cells, and the LTM IDs corresponding to the cell IDs.

[0213] LTM ID is an 8-bit ID, while cell ID is a 16-bit ID. After determining the first candidate cell, CU can configure LTM ID for each first candidate cell, generate LTM configuration ID mapping list, associate the cell ID of the first candidate cell with LTM ID, and in the process of cell switching, service DU, UE and CU can use LTM ID to replace cell ID, so as to reduce the amount of transmitted data, reduce the consumption of communication resources, and improve communication efficiency.

[0214] Based on the above exemplary description, in S102, the service DU may also determine the first execution condition in the following manner.

[0215] Figure 5 The signaling interaction diagram of the method for determining the first execution condition provided in the embodiment of the present application. Figure 5 As shown, the method includes:

[0216] S201. CU sends fourth information to serving DU.

[0217] Correspondingly, the service DU receives the fourth information sent by the CU.

[0218] The fourth information includes an L3 measurement report, and the L3 measurement report is used to indicate a result of L3 measurement performed by the UE.

[0219] After the UE accesses the service DU, the UE needs to perform L3 measurement to obtain L3 measurement results. The UE can report the L3 measurement report to the UE through the service DU in a periodic, aperiodic or event-triggered manner. The L3 measurement report is used to indicate one or more L3 measurement results.

[0220] The L3 measurement report indicates the cell level results and beam level results, which can be used to configure parameters such as hysteresis, TTT, threshold, etc. in the first execution condition.

[0221] The CU needs to parse the L3 measurement report and send the parsed L3 measurement report to the serving DU, so that the serving DU can generate the L3 execution condition according to the L3 measurement report.

[0222] In some examples, the fourth information may be carried in a downlink RRC (DL RRC) message.

[0223] S202: The serving DU determines a first execution condition according to the first information and the layer 3 measurement report.

[0224] Based on this, the service DU can adjust the hysteresis, TTT, threshold and other parameters in the first execution condition according to the first information and the layer 3 measurement report, and refer to the cell-level results and beam-level results in the layer 3 measurement report to generate the first execution condition, thereby improving the accuracy of the generated first execution condition, so that the UE can trigger cell switching more accurately according to the first execution condition.

[0225] Based on the above exemplary description, after the first execution condition is determined and the UE performs L1 measurement and reports the L1 measurement result, the serving DU may also update the first execution condition.

[0226] Figure 6 This is a signaling interaction diagram of a method for updating a first execution condition provided in an embodiment of the present application. Figure 6 As shown, the method also includes:

[0227] S301. The serving DU updates a first execution condition according to an L1 measurement report.

[0228] The L1 measurement report is obtained by the UE performing L1 measurement, and the L1 measurement report is used to indicate the result of the L1 measurement performed by the UE.

[0229] Based on the provisions of the 3GPP protocol, after performing L1 measurement on the first candidate cell, the UE will also report an L1 measurement report to the serving DU. The serving DU can obtain the measurement parameters corresponding to the first candidate cell, such as RSRQ, RSRP or SINR values, from the L1 measurement report.

[0230] Based on this, the service DU can evaluate whether the first execution condition is applicable to the value of the above-mentioned measurement parameter. If the service DU determines that the threshold of the measurement parameter configured in the first execution condition is not applicable to the value of the measurement parameter indicated in the L1 measurement report, the service DU can update the first execution condition based on the L1 measurement report. For example, the service DU can adjust the threshold corresponding to the measurement parameter in the first execution condition, so that the first execution condition is more accurate, which helps to improve the accuracy of the subsequent UE triggering cell switching according to the first execution condition, and further improves the communication quality of the UE.

[0231] S302: The service DU sends fifth information to the UE, or the service DU forwards the updated first execution condition to the UE via a radio resource control RRC layer message.

[0232] The fifth information is transmitted via the medium access control MAC layer.

[0233] The fifth information carries the updated first execution condition.

[0234] The service DU may send the updated first execution condition directly to the UE via a MAC layer message.

[0235] In addition, after the service DU sends the updated first execution condition to the UE via a MAC layer message, the UE may return a confirmation message to the service DU, such as a hybrid automatic repeat request acknowledgement / negative acknowledgement (HARQ ACK / NACK), which is used to indicate whether the UE has successfully received the fifth information.

[0236] Of course, the service DU may also forward the updated first execution condition to the UE via an RRC layer message.

[0237] S303: The UE triggers cell switching in one or more first candidate cells according to the updated first execution condition.

[0238] Based on the above exemplary description, in S302, the service DU can be provided as follows: Figure 7 The method shown forwards the updated first execution condition to the UE via an RRC layer message.

[0239] Figure 7 This is a signaling interaction diagram of a method for sending an updated first execution condition provided by an embodiment of the present application. Figure 7 As shown, the method includes:

[0240] S401. The serving DU sends an updated first execution condition to the CU.

[0241] The updated first execution condition may be carried in a UE CONTEXT MODIFICATION RESPONSE message.

[0242] S402. The CU sends RRC information to the serving DU through the RRC layer.

[0243] Correspondingly, the service DU receives the RRC information sent by the CU through the RRC layer.

[0244] The RRC information includes the updated first execution condition.

[0245] The RRC information may be carried in a downlink RRC message transmission (DL RRC MESSAGE TRANSFER) message.

[0246] S403: The service DU sends RRC information to the UE through the RRC layer.

[0247] Based on this, the UE can receive the updated first execution condition through the RRC layer, thereby triggering cell switching according to the updated first execution condition.

[0248] In addition, the UE may send an RRC Reconfiguration Complete message to the serving DU, and the serving DU sends the RRC Reconfiguration Complete message to the CU, to ensure that the CU is aware of the UE and receives the updated first execution condition.

[0249] Based on the above exemplary description, before S101, the CU may perform the following steps: Figure 8 In the manner shown, one or more first candidate cells are determined.

[0250] Figure 8 This is a signaling interaction diagram of a method for determining a first candidate cell provided in an embodiment of the present application. Figure 8 As shown, the method includes:

[0251] S501. UE sends an L3 measurement report to a serving DU.

[0252] Correspondingly, the serving DU receives the L3 measurement report sent by the UE.

[0253] Among them, the L3 measurement report is obtained by the UE performing L3 measurement according to the L3 measurement configuration.

[0254] Among them, the L3 measurement includes measuring one or more parameters such as RSRP, RSRQ or SINR. When the UE initially accesses the first network device, the first network device configures the L3 measurement configuration for the UE, so that the UE can perform periodic or non-periodic L3 measurements on the neighboring cells according to the L3 measurement configuration to obtain an L3 measurement report. The L3 measurement report is used to indicate the result of the L3 measurement performed by the UE. For example, the L3 measurement report may include one or more L3 measurement results, and the L3 measurement results include the RSRP value, RSRQ value or SINR value corresponding to the neighboring cell.

[0255] Among them, the neighboring cell is a cell adjacent to the serving cell, and the number of the neighboring cells can be one or more.

[0256] Therefore, the serving DU may forward the L3 measurement report to the CU so that the CU may learn the result of the L3 measurement performed by the UE.

[0257] S502: The serving DU sends an L3 measurement report to the CU.

[0258] Correspondingly, the CU receives the L3 measurement report sent by the serving DU.

[0259] The CU may determine one or more fifth candidate cells based on the L3 measurement report, where the fifth candidate cells are candidate cells preliminarily determined by the CU and can be used for cell switching.

[0260] There are multiple situations for the fifth candidate cell.

[0261] Case 1: one or more fifth candidate cells all belong to the serving DU.

[0262] In case 2, one or more fifth candidate cells all belong to the first DU, and the first DU is other DUs under the CU to which the serving DU belongs.

[0263] Case 3: a part of the one or more fifth candidate cells belongs to the serving DU, and another part belongs to the first DU.

[0264] The fifth candidate cell belonging to the first DU is called the third candidate cell. In the above situation 2 or situation 3, since the serving DU cannot know whether the third candidate cell allows the UE to access, the CU needs to send a request to the first DU to inquire whether the third candidate cell of the first DU allows the UE to access.

[0265] S503. The CU sends sixth information to the first DU.

[0266] Correspondingly, the first DU receives the sixth information sent by the CU.

[0267] The sixth information is used to indicate a third candidate cell, and the sixth information is used to request that the third candidate cell be configured as a conditional switching cell. That is, the sixth information is used to request the first DU to configure the third candidate cell as a cell for the UE to perform cell switching according to the first execution condition or the second execution condition.

[0268] The first DU includes one or more DUs corresponding to the third candidate cells.

[0269] When there are multiple third candidate cells, there are also multiple sixth information, and the sixth information corresponds to the third candidate cells one by one. The CU sends the sixth information to the first DU corresponding to the third candidate cell.

[0270] In some examples, the sixth information is carried in a UE context setup request (UE CONTEXT SETUP REQUEST).

[0271] S504. The second DU sends seventh information to the CU.

[0272] Correspondingly, the CU receives the seventh information sent by the second DU.

[0273] The seventh information is used to indicate a first candidate cell.

[0274] The seventh information is used to respond that the first candidate cell can be configured as a conditional switching cell.

[0275] The second DU is part or all of the DU in the first DU, and the first candidate cell is a cell in the second DU that the UE is allowed to access.

[0276] Based on this, after the first DU receives the sixth information, the first DU can determine whether to allow the UE to access based on the current network load or the network load in the future, and the attributes of the third candidate cell. The attributes of the third candidate cell are, for example, whether the third candidate cell is a dedicated cell.

[0277] The candidate cell that the UE is allowed to access is called the first candidate cell, and the DU corresponding to the first candidate cell is called the second DU. The second DU replies to the CU, so that the CU knows which candidate cells the UE is allowed to access.

[0278] In some examples, the seventh information is carried in a UE context setup response (UE CONTEXT SETUPRESPONSE).

[0279] In the above embodiment, by determining the first candidate cell, cells that the UE is allowed to access can be screened out from neighboring cells, so that when the UE performs cell switching, it can measure these cells and evaluate the cell switching, thereby improving the efficiency and accuracy of cell switching.

[0280] Based on the above exemplary description, the first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

[0281] Based on the above exemplary description, the second information also includes a third execution condition, which is used to configure the UE to trigger cell switching between one or more second candidate cells based on L1 measurement, one or more second candidate cells allow UE access, and one or more second candidate cells are different from one or more first candidate cells.

[0282] The third execution condition is determined by the serving DU according to a third measurement configuration, the third measurement configuration is used to indicate SSB or CSI-RS of one or more second candidate cells that can be used for L1 measurement, and the third measurement configuration is determined by the CU.

[0283] Therefore, the third information also includes third configuration information, and the third configuration information includes a third execution condition and a third measurement configuration, so that the UE can also perform L1 measurement according to the third measurement configuration, and trigger cell switching in one or more second candidate cells according to the third execution condition.

[0284] The second candidate cell may be a cell configured by the CU for performing LTM. The third measurement configuration is the measurement resources configured by the CU for performing LTM for the second candidate cell.

[0285] Based on this, in addition to the first candidate cell, the service DU can configure the second candidate cell as a cell for conditional cell switching, and also generate a third execution condition for the second candidate cell, thereby expanding the range of optional cells for cell switching. When the UE performs cell switching according to the third measurement configuration and the third execution condition, the success rate of the UE's cell switching can be improved.

[0286] Based on the above exemplary description, the third information further includes a fourth execution condition, and the fourth execution condition is used to configure the UE to trigger a cell switching between one or more fourth candidate cells based on L3 measurement.

[0287] The fourth execution condition is determined by the CU according to a fourth measurement configuration, the fourth measurement configuration is used to indicate SSB or CSI-RS of one or more fourth candidate cells that can be used for L3 measurement, and the fourth measurement configuration is determined by the CU.

[0288] Therefore, the third information also includes fourth configuration information, and the fourth configuration information includes a fourth execution condition and a fourth measurement configuration, so that the UE can also perform L3 measurement according to the fourth measurement configuration, and trigger cell switching in one or more second candidate cells according to the fourth execution condition.

[0289] The fourth candidate cell may be a cell configured by the CU for performing L3 measurement. The fourth measurement configuration is resources configured by the CU for the fourth candidate cell for performing L3 measurement.

[0290] Based on this, in addition to the first candidate cell, the CU can configure the fourth candidate cell as a cell for conditional cell switching, and also generate a fourth execution condition for the fourth candidate cell, thereby expanding the range of optional cells for cell switching. When the UE performs cell switching according to the fourth measurement configuration and the fourth execution condition, the success rate of the UE's cell switching can be improved.

[0291] Illustratively, the present application also provides a communication device.

[0292] Fig. 9 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0293] like Fig. 9 As shown, the communication device 100 can exist independently or be integrated in other devices, and can communicate with the terminal device and the centralized unit mentioned above to implement the operation corresponding to the service distribution unit in any of the above method embodiments.

[0294] The communication device 100 may include: a transceiver unit 101 and a processing unit 102. The transceiver unit 101 may implement corresponding communication functions. The transceiver unit 101 may also be called a communication interface or a communication unit. The processing unit 102 may read instructions and / or data in a storage unit.

[0295] Optionally, the communication device 100 may further include a storage unit, which may be used to store instructions and / or data so that the communication device 100 implements the aforementioned method embodiment.

[0296] The communication device 100 can be used to perform the actions performed by the service distribution unit in the above method embodiment. The communication device 100 can be a service distribution unit or a component that can be configured in a service distribution unit. The transceiver unit 101 is used to perform the reception-related operations of the service distribution unit in the above method embodiment.

[0297] Optionally, the transceiver unit 101 may include a sending unit and a receiving unit. The sending unit is used to perform the sending operation in the above method embodiment. The receiving unit is used to perform the receiving operation in the above method embodiment.

[0298] It should be noted that the communication device 100 may include a sending unit but not a receiving unit. Alternatively, the communication device 100 may include a receiving unit but not a sending unit. Specifically, it may depend on whether the above solution executed by the communication device 100 includes a sending action and a receiving action.

[0299] As an example, the communication device 100 is used to execute the above Figures 4 to 8 Actions performed by the service distribution unit in the illustrated embodiment.

[0300] The communication device 100 may include: a transceiver unit 101 and a processing unit 102 .

[0301] The transceiver unit 101 is configured to receive first information sent by a centralized unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device;

[0302] The processing unit 102 is configured to determine a first execution condition according to the first information, where the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement;

[0303] The transceiver unit 101 is configured to send second information to the central unit, where the second information includes a first execution condition;

[0304] The transceiver unit 101 is configured to receive third information sent by the central unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes the first execution condition and the first measurement configuration, and the second configuration information includes a second execution condition and a second measurement configuration;

[0305] The transceiver unit 101 is configured to send the third information to the terminal device, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition;

[0306] The second execution condition is determined by the centralized unit according to the second measurement configuration, and the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement.

[0307] It should be understood that the execution of the above corresponding processes by each unit has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0308] The processing unit 102 in the above embodiment can be implemented by at least one processor or processor-related circuit. The transceiver unit 101 can be implemented by a transceiver or a transceiver-related circuit. The transceiver unit 101 can also be called a communication unit or a communication interface. The storage unit can be implemented by at least one memory.

[0309] In some examples, the transceiver unit 101 is further used to receive fourth information sent by the central unit, where the fourth information includes a layer 3 measurement report, where the layer 3 measurement report is used to indicate a result of the layer 3 measurement performed by the terminal device;

[0310] The processing unit 102 is further configured to determine the first execution condition according to the first information and the layer 3 measurement report.

[0311] In some examples, the processing unit 102 is further configured to update the first execution condition according to a layer 1 measurement report, where the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device;

[0312] The transceiver unit 101 is also used to send fifth information to the terminal device, where the fifth information is transmitted through the medium access control MAC layer, and the fifth information carries the updated first execution condition, or the service distribution unit forwards the updated first execution condition to the terminal device through a radio resource control RRC layer message, so that the terminal device triggers cell switching in the one or more first candidate cells according to the updated first execution condition.

[0313] In some examples, the transceiver unit 101 is further configured to send the updated first execution condition to the central unit;

[0314] The transceiver unit 101 is further configured to receive, through a radio resource control RRC layer, radio resource control RRC information sent by the central unit, wherein the radio resource control RRC information includes the updated first execution condition;

[0315] The transceiver unit 101 is also used for the radio resource control RRC layer to send the radio resource control RRC information to the terminal device.

[0316] Illustratively, the present application also provides a communication device.

[0317] Fig.10 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0318] like Fig.10 As shown, the communication device 200 can exist independently or be integrated in other devices, and can communicate with the service distribution unit mentioned above to implement the operations corresponding to the centralized unit in any of the above method embodiments.

[0319] The communication device 200 may include: a transceiver unit 201 and a processing unit 202. The transceiver unit 201 may implement corresponding communication functions. The transceiver unit 201 may also be referred to as a communication interface or a communication unit. The processing unit 202 may read instructions and / or data in the storage unit.

[0320] Optionally, the communication device 200 may further include a storage unit, which may be used to store instructions and / or data so that the communication device 200 implements the aforementioned method embodiment.

[0321] The communication device 200 can be used to perform the actions performed by the centralized unit in the above method embodiment. The communication device 200 can be a centralized unit or a component that can be configured in a centralized unit. The transceiver unit 201 is used to perform the reception-related operations of the centralized unit in the above method embodiment.

[0322] Optionally, the transceiver unit 201 may include a sending unit and a receiving unit. The sending unit is used to perform the sending operation in the above method embodiment. The receiving unit is used to perform the receiving operation in the above method embodiment.

[0323] It should be noted that the communication device 200 may include a sending unit but not a receiving unit. Alternatively, the communication device 200 may include a receiving unit but not a sending unit. Specifically, it may depend on whether the above solution executed by the communication device 200 includes a sending action and a receiving action.

[0324] As an example, the communication device 200 is used to execute the above Figures 4 to 8 The actions performed by the centralized unit in the illustrated embodiment.

[0325] The communication device 200 may include: a transceiver unit 201 and a processing unit 202 .

[0326] The transceiver unit 201 is configured to send first information to a service distribution unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device;

[0327] A transceiver unit 201 is configured to receive second information sent by the service distribution unit, where the second information includes a first execution condition, where the first execution condition is determined by the service distribution unit according to the first information, and the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement;

[0328] The processing unit 202 is configured to determine a second execution condition according to a second measurement configuration, where the second execution condition is used to configure a condition for triggering, by the terminal device, a cell switching between the one or more first candidate cells based on layer 3 measurement, where the second measurement configuration is used to indicate a synchronization signal block or a channel state information reference signal corresponding to the one or more first candidate cells that can be used for layer 3 measurement;

[0329] The transceiver unit 201 is used to send third information to the service distribution unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes the first execution condition and the first measurement configuration, and the second configuration information includes the second execution condition and the second measurement configuration, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition.

[0330] In some examples, the transceiver unit 201 is also used to send fourth information to the service distribution unit, where the fourth information includes a layer 3 measurement report, and the layer 3 measurement report is used to indicate the result of the layer 3 measurement performed by the terminal device, so that the service distribution unit determines the first execution condition based on the first information and the layer 3 measurement report.

[0331] In some examples, the transceiver unit 201 is further used to send sixth information to the first distribution unit, the sixth information is used to indicate a third candidate cell, the sixth information is used to request that the third candidate cell be configured as a conditional switching cell, the third candidate cell is determined according to a layer 3 measurement report, the layer 3 measurement report is sent by the terminal device to the centralized unit through the service distribution unit, and the first distribution unit includes one or more distribution units corresponding to the third candidate cell;

[0332] The transceiver unit 201 is also used to receive the seventh information sent by the second distribution unit, where the seventh information is used to indicate a first candidate cell, and the seventh information is used to respond that the first candidate cell can be configured as a conditional switching cell, the second distribution unit is part or all of the distribution units in the first distribution unit, and the first candidate cell is a cell in the second distribution unit that allows terminal equipment to access.

[0333] In some examples, the sixth information is carried in a terminal device context setup request UE CONTEXT SETUP REQUEST, and the seventh information is carried in a terminal device context setup response UE CONTEXT SETUP RESPONSE.

[0334] Fig.11 A schematic diagram of the structure of a communication device provided in one embodiment of the present application.

[0335] like Fig.11 As shown, the communication device 300 can exist independently or be integrated in other devices, and can communicate with the service distribution unit mentioned above to implement the operation corresponding to the terminal device in any of the above method embodiments.

[0336] The communication device 300 may include: a transceiver unit 301 and a processing unit 302. The transceiver unit 301 may implement corresponding communication functions. The transceiver unit 301 may also be called a communication interface or a communication unit, and the processing unit 302 may read instructions and / or data in the storage unit.

[0337] Optionally, the communication device 300 may further include a storage unit and a processing unit. The storage unit may be used to store instructions and / or data so that the communication device 300 implements the aforementioned method embodiment.

[0338] The communication device 300 can be used to perform the actions performed by the terminal device in the above method embodiment. The communication device 300 can be a terminal device or a component that can be configured in a terminal device. The transceiver unit 301 is used to perform the reception-related operations of the terminal device in the above method embodiment.

[0339] Optionally, the transceiver unit 301 may include a sending unit and a receiving unit. The sending unit is used to perform the sending operation in the above method embodiment. The receiving unit is used to perform the receiving operation in the above method embodiment.

[0340] It should be noted that the communication device 300 may include a sending unit but not a receiving unit. Alternatively, the communication device 300 may include a receiving unit but not a sending unit. Specifically, it may depend on whether the above solution executed by the communication device 300 includes a sending action and a receiving action.

[0341] As an example, the communication device 300 is used to execute the above Figures 4 to 8 Actions performed by the terminal device in the illustrated embodiment.

[0342] The communication device 300 may include: a transceiver unit 301 and a processing unit 302 .

[0343] The transceiver unit 301 is configured to receive third information sent by the service distribution unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes a first execution condition and a first measurement configuration, and where the second configuration information includes a second execution condition and a second measurement configuration;

[0344] The processing unit 302 is configured to perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration;

[0345] The processing unit 302 is configured to trigger a cell handover in one or more first candidate cells according to the first execution condition and / or the second execution condition;

[0346] Among them, the second execution condition is determined by the centralized unit according to the second measurement configuration, the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement; the third information is sent by the centralized unit to the service distribution unit; the first execution condition is sent by the service distribution unit to the centralized unit through the second information, the first execution condition is determined by the service distribution unit according to the first information, the first execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 1 measurement, the first information is sent by the centralized unit to the service distribution unit, the first information includes first indication information and first measurement configuration, the first indication information is used to indicate one or more first candidate cells allowed to be accessed by the terminal device, the first measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device.

[0347] In some examples, the transceiver unit 301 is further used to receive fifth information sent by the service distribution unit, the fifth information is transmitted through the medium access control MAC layer, and the fifth information carries the updated first execution condition, or the terminal device receives the updated first execution condition forwarded by the service distribution unit through a radio resource control RRC layer message;

[0348] The processing unit 302 is further configured to trigger a cell handover in the one or more first candidate cells according to the updated first execution condition;

[0349] The updated first execution condition is determined by the service distribution unit according to a layer 1 measurement report, wherein the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device.

[0350] In some examples, the first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

[0351] In some examples, the second information also includes a third execution condition, the third execution condition is used to configure the terminal device to trigger a cell switching between one or more second candidate cells based on layer 1 measurement, the one or more second candidate cells allow the terminal device to access, the one or more second candidate cells are different from the one or more first candidate cells, the third execution condition is determined by the service distribution unit according to a third measurement configuration, the third measurement configuration is used to indicate that the one or more second candidate cells can be used for synchronization signal blocks or channel state information reference signals for layer 1 measurement, and the third measurement configuration is determined by the centralized unit; the third information also includes third configuration information, the third configuration information includes the third execution condition and a third measurement configuration, so that the terminal device can also perform layer 1 measurement according to the third measurement configuration, and trigger cell switching in the one or more second candidate cells according to the third execution condition.

[0352] In some examples, the third information also includes a fourth execution condition, wherein the fourth execution condition is used to configure the terminal device to trigger a cell switching between one or more fourth candidate cells based on layer 3 measurement, and the fourth execution condition is determined by the centralized unit according to a fourth measurement configuration, and the fourth measurement configuration is used to indicate a synchronization signal block or a channel state information reference signal that can be used for layer 3 measurement of the one or more fourth candidate cells, and the fourth measurement configuration is determined by the centralized unit; the third information also includes fourth configuration information, and the fourth configuration information includes the fourth execution condition and the fourth measurement configuration, so that the terminal device can also perform layer 3 measurement according to the fourth measurement configuration, and trigger a cell switching in the one or more fourth candidate cells according to the fourth execution condition.

[0353] Exemplarily, the present application also provides a communication device.

[0354] Fig.12 A schematic diagram of the hardware structure of a communication device provided in one embodiment of the present application.

[0355] The communication device 400 includes a processor 401, which is coupled to a memory 402. The memory 402 is used to store computer programs or instructions and / or data. The processor 401 is used to execute the computer programs or instructions and / or data stored in the memory 402, so that the method in the above method embodiment is executed.

[0356] Optionally, the communication device 400 includes one or more processors 401 .

[0357] Optionally, the communication device 400 may include one or more memories 402 .

[0358] Optionally, the memory 402 may be integrated with the processor 401 or provided separately.

[0359] The communication device 400 may further include a transceiver, which is used to receive and / or send signals. For example, the processor 401 is used to control the transceiver to receive and / or send signals.

[0360] As a solution, the communication device 400 is used to implement the operations performed by any one of the central unit, the service distribution unit and the terminal device in the above method embodiments.

[0361] For example, processor 401 is used to implement processing-related operations performed by any one of the centralized unit, service distribution unit and terminal device in the foregoing method embodiments, and the transceiver is used to implement sending and receiving-related operations performed by any one of the centralized unit, service distribution unit and terminal device in the foregoing method embodiments.

[0362] Above Fig.12 In the communication device shown, the device for receiving power in the transceiver can be regarded as a receiving unit, and the device for transmitting function in the transceiver can be regarded as a transmitting unit. That is, the transceiver can include a receiver and a transmitter. The transceiver can also be called a transceiver, a transceiver unit, or a transceiver circuit, etc. The receiver can also be called a receiver, a receiving unit, a receiver, or a receiving circuit, etc. The transmitter can also be called a transmitter, a transmitter, a transmitting unit or a transmitting circuit, etc. The processor 401 has a processing function, and the processor 401 can be called a processing unit. The memory 402 is used to store computer program code and data, and the memory 402 can also be called a storage unit.

[0363] Wherein, when the communication device is a chip, the chip includes a transceiver, a memory and a processor. Wherein, the transceiver can be an input-output circuit or a communication interface; the processor is a processor or a microprocessor or an integrated circuit integrated on the chip. The sending operation of any one of the centralized unit, the service distribution unit and the terminal device in the above method embodiment can be understood as the output of the chip, and the receiving operation of any one of the centralized unit, the service distribution unit and the terminal device in the above method embodiment can be understood as the input of the chip.

[0364] Exemplarily, the present application also provides a computer-readable storage medium on which are stored computer instructions for implementing the method executed by any one of the centralized unit, the service distribution unit and the terminal device in the above method embodiment.

[0365] For example, when the computer program is executed by a computer, the computer can implement the method executed by any one of the centralized unit, the service distribution unit and the terminal device in the above method embodiment.

[0366] Exemplarily, the present application also provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to implement the method executed by any one of the centralized unit, service distribution unit and terminal device in the above method embodiment.

[0367] Exemplarily, the present application also provides a communication system, which includes: a first network device and a terminal device, wherein the first network device includes a centralization unit and a service distribution unit.

[0368] The processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, a baseband processor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method of the above embodiment. The memory mentioned in any of the above may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0369] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the explanation of the relevant contents and beneficial effects of any of the communication devices provided above can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0370] In the present application, any entity among the centralized unit, service distribution unit and terminal device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. Among them, the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU) and a memory (also called main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as Linux operating system, Unix operating system, Android operating system, iOS operating system or Windows operating system. The application layer may include applications such as browsers, address books, word processing software, and instant messaging software.

[0371] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0372] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0373] 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 distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0374] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0375] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the part that essentially contributes to the technical solution of the present application or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the process of each embodiment method of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

[0376] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cell switching method, characterized in that: The method comprises: The service distribution unit receives first information sent by the centralized unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device; The service distribution unit determines, according to the first information, a first execution condition, where the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement; The service distribution unit sends second information to the central unit, wherein the second information includes a first execution condition; The service distribution unit receives third information sent by the central unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes the first execution condition and the first measurement configuration, and the second configuration information includes a second execution condition and a second measurement configuration; The service distribution unit sends the third information to the terminal device, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition; The second execution condition is determined by the centralized unit according to the second measurement configuration, and the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement.

2. The method according to claim 1, characterized in that The method further comprises: The service distribution unit receives fourth information sent by the central unit, where the fourth information includes a layer 3 measurement report, where the layer 3 measurement report is used to indicate a result of layer 3 measurement performed by the terminal device; The service distribution unit determines the first execution condition according to the first information and the layer 3 measurement report.

3. The method according to claim 1, characterized in that The method further comprises: The service distribution unit updates the first execution condition according to a layer 1 measurement report, where the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device; The service distribution unit sends fifth information to the terminal device, and the fifth information is transmitted through the medium access control MAC layer. The fifth information carries the updated first execution condition, or the service distribution unit forwards the updated first execution condition to the terminal device through a radio resource control RRC layer message, so that the terminal device triggers cell switching in the one or more first candidate cells according to the updated first execution condition.

4. The method according to claim 3, characterized in that The service distribution unit forwards the updated first execution condition to the terminal device through a radio resource control RRC layer message, including: The service distribution unit sends the updated first execution condition to the central unit; The service distribution unit receives the radio resource control RRC information sent by the centralized unit through the radio resource control RRC layer, wherein the radio resource control RRC information includes the updated first execution condition; The service distribution unit sends the radio resource control RRC information to the terminal device through the radio resource control RRC layer.

5. A cell switching method, characterized in that: The method comprises: The centralization unit sends first information to the service distribution unit, where the first information includes first indication information and a first measurement configuration, where the first indication information is used to indicate one or more first candidate cells that the terminal device is allowed to access, and the first measurement configuration is used to indicate synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device; The central unit receives second information sent by the service distribution unit, where the second information includes a first execution condition, where the first execution condition is determined by the service distribution unit according to the first information, and the first execution condition is used to configure a condition for the terminal device to trigger a cell handover between the one or more first candidate cells based on layer 1 measurement; The centralized unit determines, according to the second measurement configuration, a second execution condition, where the second execution condition is used to configure a condition for triggering, by the terminal device, a cell switching between the one or more first candidate cells based on layer 3 measurement, where the second measurement configuration is used to indicate a synchronization signal block or a channel state information reference signal corresponding to the one or more first candidate cells that can be used for layer 3 measurement; The centralized unit sends third information to the service distribution unit, the third information including first configuration information and second configuration information, the first configuration information including the first execution condition and the first measurement configuration, the second configuration information including the second execution condition and the second measurement configuration, so that the terminal device can perform layer 1 measurement according to the first measurement configuration, and / or perform layer 3 measurement according to the second measurement configuration, and trigger cell switching in the one or more first candidate cells according to the first execution condition and / or the second execution condition.

6. The method according to claim 5, characterized in that The method further comprises: The centralized unit sends fourth information to the service distribution unit, the fourth information including a layer 3 measurement report, the layer 3 measurement report being used to indicate a result of layer 3 measurement performed by the terminal device, so that the service distribution unit determines the first execution condition according to the first information and the layer 3 measurement report.

7. The method according to claim 5, characterized in that The method further comprises: The centralized unit sends sixth information to the first distributed unit, the sixth information is used to indicate a third candidate cell, the sixth information is used to request that the third candidate cell be configured as a conditional switching cell, the third candidate cell is determined according to a layer 3 measurement report, the layer 3 measurement report is sent by the terminal device to the centralized unit through the service distributed unit, and the first distributed unit includes one or more distributed units corresponding to the third candidate cell; The centralized unit receives seventh information sent by the second distributed unit, where the seventh information is used to indicate a first candidate cell, and the seventh information is used to respond that the first candidate cell can be configured as a conditional switching cell, the second distributed unit is part or all of the distributed units in the first distributed unit, and the first candidate cell is a cell in the second distributed unit that allows terminal devices to access.

8. The method according to claim 7, characterized in that The sixth information is carried in a terminal device context setting request UE CONTEXT SETUP REQUEST, and the seventh information is carried in a terminal device context setting response UECONTEXT SETUP RESPONSE.

9. A cell switching method, characterized in that: The method comprises: The terminal device receives third information sent by the service distribution unit, where the third information includes first configuration information and second configuration information, where the first configuration information includes a first execution condition and a first measurement configuration, and where the second configuration information includes a second execution condition and a second measurement configuration; The terminal device performs layer 1 measurement according to the first measurement configuration, and / or performs layer 3 measurement according to the second measurement configuration; The terminal device triggers a cell handover in one or more first candidate cells according to the first execution condition and / or the second execution condition; Among them, the second execution condition is determined by the centralized unit according to the second measurement configuration, the second execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 3 measurement, and the second measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 3 measurement; the third information is sent by the centralized unit to the service distribution unit; the first execution condition is sent by the service distribution unit to the centralized unit through the second information, the first execution condition is determined by the service distribution unit according to the first information, the first execution condition is used to configure the condition for the terminal device to trigger cell switching between the one or more first candidate cells based on layer 1 measurement, the first information is sent by the centralized unit to the service distribution unit, the first information includes first indication information and first measurement configuration, the first indication information is used to indicate one or more first candidate cells allowed to be accessed by the terminal device, the first measurement configuration is used to indicate the synchronization signal blocks or channel state information reference signals corresponding to the one or more first candidate cells that can be used for layer 1 measurement, and the service distribution unit is a distribution unit currently providing services for the terminal device.

10. The method according to claim 9, characterized in that The method further comprises: The terminal device receives fifth information sent by the service distribution unit, where the fifth information is transmitted through a medium access control MAC layer, and the fifth information carries the updated first execution condition, or the terminal device receives the updated first execution condition forwarded by the service distribution unit through a radio resource control RRC layer message; The terminal device triggers a cell handover in the one or more first candidate cells according to the updated first execution condition; The updated first execution condition is determined by the service distribution unit according to a layer 1 measurement report, wherein the layer 1 measurement report is obtained by the terminal device performing layer 1 measurement, and the layer 1 measurement report is used to indicate a result of the layer 1 measurement performed by the terminal device.

11. The method according to any one of claims 1 to 10, characterized in that: The first execution condition and the second execution condition are conditions for triggering cell switching based on A3 and / or A5 events.

12. The method according to any one of claims 1 to 10, characterized in that: The second information also includes a third execution condition, and the third execution condition is used to configure the terminal device to trigger a cell switching between one or more second candidate cells based on layer 1 measurement, and the one or more second candidate cells allow the terminal device to access, and the one or more second candidate cells are different from the one or more first candidate cells. The third execution condition is determined by the service distribution unit according to a third measurement configuration, and the third measurement configuration is used to indicate that the one or more second candidate cells can be used for synchronization signal blocks or channel state information reference signals for layer 1 measurement, and the third measurement configuration is determined by the centralized unit; the third information also includes third configuration information, and the third configuration information includes the third execution condition and a third measurement configuration, so that the terminal device can also perform layer 1 measurement according to the third measurement configuration, and trigger cell switching in the one or more second candidate cells according to the third execution condition.

13. The method according to any one of claims 1 to 10, characterized in that: The third information also includes a fourth execution condition, wherein the fourth execution condition is used to configure the terminal device to trigger cell switching between one or more fourth candidate cells based on layer 3 measurement, and the fourth execution condition is determined by the centralized unit according to a fourth measurement configuration, and the fourth measurement configuration is used to indicate a synchronization signal block or a channel state information reference signal that can be used for layer 3 measurement of the one or more fourth candidate cells, and the fourth measurement configuration is determined by the centralized unit; the third information also includes fourth configuration information, and the fourth configuration information includes the fourth execution condition and the fourth measurement configuration, so that the terminal device can also perform layer 3 measurement according to the fourth measurement configuration, and trigger cell switching in the one or more fourth candidate cells according to the fourth execution condition.

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