Cell handover method, and device, storage medium and product

Abstract

The embodiments of the present application relate to the technical field of communications. Provided are a cell handover method, and a device, a storage medium and a product. The method comprises: a terminal device receiving indication information sent by a source primary cell network device, wherein the indication information is used for indicating a cell handover policy under the coexistence of layer 1 / 2 triggered mobility (LTM) and conditional handover (CHO) and / or conditional primary secondary cell change (CPC); and executing cell handover on the basis of the indication information. In the above solution, a terminal device reasonably executes cell handover by means of a cell handover policy under the coexistence of LTM and CHO and / or CPC, so that the success rate of cell handover can be improved.

Description

Cell switching method, device, storage medium and product

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 2, 2024, with application number 202410146292.3 and application name “Cell Switching Method, Device, Storage Medium and Product”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a cell switching method, device, storage medium and product. Background Art

[0003] With the continuous development of communication and dual connectivity (DC) technology, it is necessary to adopt primary cells (Pcells) and primary secondary cells (PScells) to provide communication services to enhance network stability. In dual connectivity, terminal devices are required to switch between the primary and secondary cells. Switching between the primary and secondary cells involves conditional handover (CHO) and layer 1 / 2 triggered mobility (LTM). Switching between the primary and secondary cells involves conditional PScell ​​change (CPC).

[0004] When LTM coexists with CHO and / or CPC, handover conflicts are likely to occur, ultimately resulting in a low handover success rate. Summary of the Invention

[0005] The embodiments of the present application provide a cell switching method, device, storage medium, and product, which are applied to the field of communication technology. By adopting a cell switching strategy under the coexistence of LTM, CHO, and / or CPC, the cell switching is reasonably executed, thereby improving the success rate of the cell switching.

[0006] In a first aspect, embodiments of the present application provide a cell handover method. The method may be executed by a terminal device, or may be executed by a component (such as a chip or circuit) configured in the terminal device. This application does not limit this.

[0007] For example, the method includes:

[0008] Receive indication information sent by the source primary cell network device, where the indication information is used to indicate the cell switching strategy under the coexistence of mobility LTM triggered at layer 1 / 2 and conditional handover CHO and / or conditional primary and secondary cell change CPC; and execute cell switching according to the indication information.

[0009] It should be understood that the terminal device performs cell switching based on the received cell switching strategy, which can standardize the switching action of the terminal device during cell switching, avoid switching conflicts between different switching methods, and thus improve the switching success rate of the terminal device.

[0010] In other words, the coexistence of LTM with CHO and / or CPC results in handover conflicts, ultimately leading to a low handover success rate. Therefore, the technical solution provided by this application addresses this situation. The terminal device performs a handover of the primary cell, or a handover of the primary cell and the primary and secondary cells, based on a received handover policy. This resolves the handover conflicts in this coexistence scenario and standardizes the handover actions of the terminal device during cell handover, effectively improving the handover success rate of the terminal device.

[0011] In combination with the first aspect, in certain implementations of the first aspect, when executing cell switching according to the indication information, facing the coexistence of LTM, CHO and CPC, it can be specifically: when at least one of CPC and CHO meets the execution conditions, the LTM switching instruction sent by the source main cell network device is received, then the main cell switching can be executed according to the indication information, or the main cell and the main and auxiliary cells can be switched.

[0012] That is to say, when the LTM switching instruction sent by the source main cell network device is received when at least one of CPC and CHO meets the execution conditions, the terminal device executes the switching of the main cell or the switching of the main cell and the main and auxiliary cells according to the instruction information, which standardizes the terminal device's switching action on the main cell or the switching action on the main cell and the main and auxiliary cells, thereby effectively avoiding switching conflicts between different switching methods and further improving the switching success rate of the terminal device.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the indication information is the first indication information or the second indication information; the first indication information is the indication information when the LTM candidate primary cell is not associated with the primary and secondary cells, and the second indication information is the indication information when the LTM candidate primary cell is associated with the primary and secondary cells.

[0014] It should be noted that the situation where the LTM candidate primary cell is not associated with the primary and secondary cells means that the LTM primary cell switching and the CPC primary and secondary cell switching do not require associated configuration. In the case where the LTM candidate primary cell is not associated with the primary and secondary cells, the indication information is the first indication information. The situation where the LTM candidate primary cell is associated with the primary and secondary cells means that the LTM primary cell switching and the CPC primary and secondary cell switching need to be associated with configuration. In the case where the LTM candidate primary cell is associated with the primary and secondary cells, the indication information is the second indication information. Therefore, different indication information can provide the terminal device with corresponding switching strategies based on whether the LTM candidate primary cell is associated with the primary and secondary cells, thereby improving the comprehensiveness of the switching strategy.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the first indication information includes at least one item of first configuration information and at least one item of configuration indication information;

[0016] The first configuration information includes at least one of the following information:

[0017] Configuration information of LTM candidate primary cells;

[0018] Configuration information of candidate primary cells of the CHO and execution conditions of switching of the primary cell of the CHO;

[0019] The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0020] It should be understood that the configuration information of the LTM candidate primary cell includes but is not limited to: the cell offset of the LTM candidate primary cell, the maximum number of users of the LTM candidate primary cell, the transmission power of the LTM candidate primary cell, etc.

[0021] Similarly, the configuration information of the CHO candidate primary cell includes but is not limited to: the cell offset of the CHO candidate primary cell, the maximum number of users of the CHO candidate primary cell, the transmit power of the CHO candidate primary cell, etc.

[0022] Similarly, the configuration information of the primary and secondary cells associated with the CHO candidate primary cell includes but is not limited to: the cell offset of the associated primary and secondary cells, the maximum number of users of the associated primary and secondary cells, the transmit power of the associated primary and secondary cells, etc.

[0023] It should be understood that the execution conditions for CHO primary cell switching are referred to as CHO execution conditions. The execution conditions for CPC primary and secondary cell switching can be referred to as CPC execution conditions. Both CHO execution conditions and CPC execution conditions can refer to the execution conditions: at least one of Event A3, A4, or A5. Furthermore, the execution conditions for CHO primary cell switching are the basis for the terminal device to evaluate CHO candidate primary cells; the execution conditions for CPC primary and secondary cell switching are the basis for the terminal device to evaluate CPC primary and secondary cells.

[0024] The configuration instruction information includes at least one of the following information:

[0025] First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary and secondary cell switching;

[0026] Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover;

[0027] Waiting time for CHO evaluation.

[0028] It should be understood that the above configuration indication information can provide a basis for cell switching in the scenario where the LTM candidate primary cell is not associated with the primary and secondary cells:

[0029] For example, if at least one primary cell handover conflicts with a CPC primary / secondary cell handover, the terminal device cannot determine whether to perform a primary cell handover or a CPC primary / secondary cell handover. When the first indication information includes the first configuration indication information, the terminal device can determine which cell to perform the handover based on this, effectively improving the handover success rate.

[0030] For another example, if the two primary cell switching methods, LTM primary cell switching and CHO primary cell switching, conflict, the terminal device cannot determine whether to perform LTM primary cell switching or CHO primary cell switching. When the first indication information includes the second configuration indication information, the terminal device can determine which primary cell switching method to use for the switching of the primary cell based on this, that is, when the second configuration indication information indicates that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, it is determined to perform LTM primary cell switching. When the second configuration indication information indicates that the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching, it is determined to perform CHO primary cell switching. Therefore, the second configuration indication information can enable the terminal device to determine which primary cell switching method to perform, effectively improving the switching success rate of the primary cell.

[0031] For another example, the waiting time for CHO evaluation may extend the terminal device's evaluation of whether the CHO candidate primary cell meets the CHO execution condition if the CHO execution condition is not met.

[0032] Therefore, the first configuration information and configuration indication information provide technical support for subsequent terminal devices to determine which primary cell switching mode to execute or how to determine whether to execute primary cell switching or primary cell and primary and secondary cell switching when the LTM candidate primary cell is not associated with the primary and secondary cells.

[0033] In combination with the first aspect, in certain implementations of the first aspect, if at least one of the CPC and the CHO receives an LTM switching instruction sent by the source primary cell network device when the execution conditions are met, the switching of the primary cell is executed or the switching of the primary cell and the primary and secondary cells is executed according to the indication information. Based on this, the embodiment of the present application further refines the situation where the LTM candidate primary cell is not associated with the primary and secondary cells, and provides corresponding cell switching strategies in the refined case. For example, if the execution conditions for CPC primary and secondary cell switching are met and the CHO receives an LTM switching instruction sent by the source primary cell network device during the evaluation process, the switching of the primary cell is executed or the switching of the primary cell and the primary and secondary cells is executed according to the first indication information; or, if the execution conditions for CHO primary cell switching are met and the LTM switching instruction sent by the source primary cell network device is received, the switching of the primary cell is executed according to the first indication information; or, if the execution conditions for CHO primary cell switching are met and the execution conditions for CPC primary and secondary cell switching are met and the LTM switching instruction sent by the source primary cell network device is received, the switching of the primary cell is executed according to the first indication information.

[0034] In combination with the first aspect, in certain implementations of the first aspect, executing a primary cell handover or executing a primary cell and a primary and secondary cell handover according to the first indication information includes: executing an LTM primary cell handover and a CPC primary and secondary cell handover when the LTM target primary cell switched in the LTM handover instruction is a CHO candidate primary cell; or executing an LTM primary cell handover when the LTM target primary cell is not a CHO candidate primary cell; or executing a CHO primary cell handover and a CPC primary and secondary cell handover when a second condition and a third condition are met. The second condition is that the LTM target primary cell is not a CHO candidate primary cell; and the third condition is that the waiting time for CHO evaluation is started when the execution condition for CPC primary and secondary cell handover is met, and a CHO candidate primary cell that meets the execution condition for CHO primary cell handover is found before the waiting time for CHO evaluation times out.

[0035] That is to say, because the terminal device combines the CPC and CHO evaluation results, as well as the result of whether the LTM switching instruction sent by the source main cell network device is received, the situation where the LTM candidate main cell is not associated with the main and auxiliary cells is refined, and according to the refined situation, the main cell is switched or the main cell and the main and auxiliary cells are switched according to the first indication information, which standardizes the terminal device's switching action on the main cell or the switching action on the main cell and the main and auxiliary cells when the LTM candidate main cell is not associated with the main and auxiliary cells, thereby effectively avoiding switching conflicts between different switching methods and further improving the switching success rate of the terminal device when the LTM candidate main cell is not associated with the main and auxiliary cells.

[0036] In combination with the first aspect, in certain implementations of the first aspect, when the execution conditions for CPC primary and secondary cell switching are met and the CHO receives an LTM switching instruction sent by the source primary cell network device during the evaluation process, and the LTM target primary cell switched in the LTM switching instruction is the CHO candidate primary cell, the method also includes: stopping the evaluation of the CHO candidate primary cell.

[0037] It should be understood that when the LTM candidate primary cell is not associated with the primary and secondary cells, when the LTM target primary cell switched in the LTM switching instruction is the CHO candidate primary cell, it is determined to execute the LTM primary cell switching and the CPC primary and secondary cell switching. Therefore, the terminal device stops evaluating the CHO candidate primary cell, which can save the resources occupied by the evaluation.

[0038] In combination with the first aspect, in certain implementations of the first aspect, before the second condition is met and it is determined whether the third condition is met, the method further includes: suspending the LTM handover instruction and continuing to evaluate the CHO candidate primary cells.

[0039] It should be understood that the embodiments of the present application provide different optional primary cell switching strategies for the terminal device when the LTM target primary cell is not a CHO candidate primary cell. As an optional method, the evaluation of the CHO candidate primary cell can be stopped to perform the LTM primary cell switching. As another optional method, the LTM switching instruction can be suspended to continue the evaluation of the CHO candidate primary cell, so as to perform the CHO primary cell switching and the CPC primary and secondary cell switching when the third condition is met. Therefore, the comprehensiveness and selectivity of the switching strategy when the LTM target primary cell is not a CHO candidate primary cell are improved, and the cell switching when the LTM target primary cell is not a CHO candidate primary cell is made more flexible.

[0040] In combination with the first aspect, in certain implementations of the first aspect, performing the switching of the primary cell according to the first indication information includes: performing the LTM primary cell switching when the second configuration indication information indicates that the priority of the LTM primary cell switching is higher than the priority of the CHO primary cell switching; performing the CHO primary cell switching when the second configuration indication information indicates that the priority of the CHO primary cell switching is higher than the priority of the LTM primary cell switching.

[0041] It should be understood that different second configuration indication information can provide corresponding primary cell switching strategies for the terminal device, thereby improving the comprehensiveness and selectivity of the primary cell switching strategy and making the primary cell switching more flexible.

[0042] In combination with the first aspect, in some implementations of the first aspect, the second indication information includes at least one item of second configuration information and at least one item of configuration indication information;

[0043] The second configuration information includes at least one of the following information:

[0044] Configuration information of LTM candidate primary cells;

[0045] The primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0046] Configuration information of candidate primary cells of the CHO and execution conditions of switching of the primary cell of the CHO;

[0047] The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0048] The configuration instruction information includes at least one of the following information:

[0049] First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary and secondary cell switching;

[0050] Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover;

[0051] Third configuration indication information, the third configuration indication information is used to instruct the LTM candidate primary cell and the associated primary and secondary cells to be switched together;

[0052] Waiting time for CHO evaluation.

[0053] It should be understood that, unlike the first indication information, the second indication information further includes the primary and secondary cells associated with the LTM candidate primary cell, configuration information of the associated primary and secondary cells, execution conditions for CPC primary and secondary cell switching, and third configuration indication information. Either of these two additional pieces of information can indicate the cell switching strategy to be executed by the terminal device when the LTM candidate primary cell is associated with the primary and secondary cells.

[0054] It should also be understood that the second configuration information and the configuration indication information provide technical support for how the subsequent terminal device determines which cell to switch to, or which primary cell switching method to execute, when the LTM candidate primary cell is associated with the primary and secondary cells.

[0055] In combination with the first aspect, in certain implementations of the first aspect, if at least one of the CPC and the CHO meets the execution conditions and receives the LTM switching instruction sent by the source primary cell network device, then the switching of the primary cell is executed or the switching of the primary cell and the primary and secondary cells is executed according to the indication information. Based on this, the embodiment of the present application further refines the situation of the LTM candidate primary cell being associated with the primary and secondary cells, and provides corresponding cell switching strategies in the refined case. For example, if the execution conditions for the CPC primary and secondary cell switching are met and the CHO receives the LTM switching instruction sent by the source primary cell network device during the evaluation process, then the switching of the primary cell is executed or the switching of the primary cell and the primary and secondary cells is executed according to the second indication information; or, if the execution conditions for the CHO primary cell switching are met and the primary and secondary cells associated with the CHO target primary cell also meet the execution conditions for the CPC primary and secondary cell switching and receive the LTM switching instruction sent by the source primary cell network device, then the switching of the primary cell and the primary and secondary cells is executed according to the second indication information.

[0056] In combination with the first aspect, in certain implementations of the first aspect, switching of the primary cell or switching of the primary cell and the primary and secondary cells is performed according to the second indication information, including: when the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching and includes the third configuration indication information, LTM primary cell switching and CPC primary and secondary cell switching are performed; the LTM target primary cell switched in the LTM switching instruction is not configured with associated primary and secondary cells, and / or the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, and / or the LTM primary cell switching is performed when the second indication information does not include the third configuration indication information; or, when the seventh condition is met and the eighth condition is met, CHO primary cell switching and CPC primary and secondary cell switching are performed. Among them, the seventh condition is at least one of the following: the LTM target primary cell switched in the LTM switching instruction has no configured associated primary and secondary cells; the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching; the second indication information does not include the third configuration indication information; the eighth condition is: when the execution conditions of the CPC primary and secondary cell switching are met, the waiting time for CHO evaluation is started, and before the waiting time for CHO evaluation times out, there is a CHO candidate primary cell that meets the execution conditions for the CHO primary cell switching.

[0057] Because the terminal device combines the CPC and CHO evaluation results, as well as the result of whether it has received the LTM switching instruction sent by the source main cell network device, the situation of the LTM candidate main cell being associated with the main and auxiliary cells is refined, and based on the refined situation, the main cell is switched or the main cell and the main and auxiliary cells are switched according to the second indication information, which standardizes the terminal device's switching action on the main cell or the switching action on the main cell and the main and auxiliary cells when the LTM candidate main cell is associated with the main and auxiliary cells, thereby effectively avoiding switching conflicts between different switching methods and further improving the switching success rate of the terminal device when the LTM candidate main cell is associated with the main and auxiliary cells.

[0058] In combination with the first aspect, in certain implementations of the first aspect, when the LTM target primary cell switched in the LTM switching instruction is associated with the primary secondary cell that meets the execution conditions of the CPC primary secondary cell switching and includes third configuration indication information, the method also includes: stopping evaluating the CHO candidate primary cell.

[0059] It should be understood that in the case where the LTM candidate primary cell is associated with the primary and secondary cells, the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching and includes the third configuration indication information, which determines the execution of the LTM primary cell switching and the CPC primary and secondary cell switching. Therefore, the evaluation of the CHO candidate primary cell is stopped, which can save the resources occupied by the evaluation.

[0060] In combination with the first aspect, in certain implementations of the first aspect, when the LTM target primary cell switched in the LTM switching instruction is not configured with an associated primary and secondary cell, and / or the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cell that meets the execution conditions of the CPC primary and secondary cell switching, and / or the second indication information does not include the third configuration indication information, the method also includes: skipping the evaluation of the current primary and secondary cell and stopping evaluating the CHO candidate primary cell.

[0061] It should be understood that when the LTM candidate primary cell is associated with the primary and secondary cells, after determining to execute LTM primary cell switching, or executing LTM primary cell switching and CPC primary and secondary cell switching, the terminal device stops evaluating the CHO candidate primary cell, which can save resources occupied by the evaluation.

[0062] In combination with the first aspect, in certain implementations of the first aspect, before the seventh condition is met and it is determined whether the eighth condition is met, the method further includes: suspending the LTM handover instruction and continuing to evaluate the CHO candidate primary cells.

[0063] When the seventh condition is met, the embodiment of the present application provides different optional primary cell switching strategies for the terminal device. As an optional method, the evaluation of the CHO candidate primary cell can be stopped to perform the LTM primary cell switching. As another optional method, the LTM switching instruction can be suspended to continue the evaluation of the CHO candidate primary cell, so as to perform the CHO primary cell switching and the CPC primary and secondary cell switching when the eighth condition is met. Therefore, the comprehensiveness and selectivity of the switching strategy when the seventh condition is met are improved, and the cell switching when the seventh condition is met is made more flexible.

[0064] In combination with the first aspect, in certain implementations of the first aspect, performing switching of the primary cell and the primary and secondary cells according to the second indication information includes:

[0065] When the LTM target primary cell switched in the LTM switching instruction is the same as the primary cell that meets the execution conditions of the CHO primary cell switching; or when the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, the LTM primary cell switching and the CPC primary and secondary cell switching are performed;

[0066] When the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is not configured with associated primary and secondary cells, or when the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, the CHO primary cell switching and the CPC primary and secondary cell switching are performed.

[0067] It should be understood that the embodiment of the present application refines the scheme for executing the switching of the primary cell and the primary and secondary cells according to the second indication information when the LTM candidate primary cell is associated with the primary and secondary cells, thereby improving the comprehensiveness of the switching strategy.

[0068] With reference to the first aspect, in certain implementations of the first aspect, the indication information is carried in radio resource control (RRC) reconfiguration information or dedicated signaling.

[0069] In an embodiment of the present application, the indication information is carried in the radio resource control RRC reconfiguration information, which reduces the signaling overhead and effectively avoids the waste of communication resources; or the indication information is carried in the proprietary signaling, which can improve the parsing speed of the indication information.

[0070] In a second aspect, embodiments of the present application provide a cell handover method. This method can be performed by a source primary cell network device, or by a component in the source primary cell network device (e.g., an access network device or a core network device). This application does not limit this.

[0071] For example, the method includes: sending indication information to the terminal device, where the indication information is used to indicate a cell switching strategy under the coexistence of mobility LTM triggered at layer 1 / 2 and conditional handover CHO and / or conditional primary and secondary cell change CPC.

[0072] It should be understood that the source main cell network equipment provides a cell switching strategy under the coexistence of LTM, CHO and CPC, so that the terminal equipment can perform cell switching based on the switching strategy. This can standardize the switching actions of the terminal equipment during cell switching, avoid switching conflicts between different switching methods, and thus improve the switching success rate of the terminal equipment.

[0073] In other words, the coexistence of LTM with CHO and / or CPC results in handover conflicts, ultimately leading to a low handover success rate. Therefore, the technical solution provided by this application addresses this situation. The terminal device performs a handover of the primary cell, or a handover of the primary cell and the primary and secondary cells, based on a received handover policy. This resolves the handover conflict in this scenario and standardizes the handover actions of the terminal device during cell handover, effectively improving the handover success rate of the terminal device.

[0074] In conjunction with the second aspect, in certain implementations of the second aspect, the method further includes:

[0075] An LTM switching instruction is sent to the terminal device. The LTM switching instruction is sent when the terminal device evaluates that at least one of CPC and CHO meets the execution condition.

[0076] It should be understood that the source primary cell network device sends the LTM switching instruction to the terminal device, which can provide another primary cell switching method other than the CHO primary cell switching method for the primary cell switching, thereby improving the comprehensiveness and selectivity of the primary cell switching strategy.

[0077] In combination with the second aspect, in certain implementations of the second aspect, the indication information is the first indication information or the second indication information; the first indication information is the indication information when the LTM candidate primary cell is not associated with the primary and secondary cells, and the second indication information is the indication information when the LTM candidate primary cell is associated with the primary and secondary cells.

[0078] It should be noted that the situation where the LTM candidate primary cell is not associated with the primary and secondary cells means that the LTM primary cell switching and the CPC primary and secondary cell switching do not require associated configuration. In the case where the LTM candidate primary cell is not associated with the primary and secondary cells, the indication information is the first indication information. The situation where the LTM candidate primary cell is associated with the primary and secondary cells means that the LTM primary cell switching and the CPC primary and secondary cell switching need to be associated with configuration. In the case where the LTM candidate primary cell is associated with the primary and secondary cells, the indication information is the second indication information. Therefore, different indication information can provide the terminal device with corresponding switching strategies based on whether the LTM candidate primary cell is associated with the primary and secondary cells, thereby improving the comprehensiveness of the switching strategy.

[0079] In conjunction with the second aspect, in some implementations of the second aspect, the first indication information includes at least one item of first configuration information and at least one item of configuration indication information;

[0080] The first configuration information includes at least one of the following information:

[0081] Configuration information of LTM candidate primary cells;

[0082] Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell;

[0083] The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0084] The configuration instruction information includes at least one of the following information:

[0085] First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary and secondary cell switching;

[0086] Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover;

[0087] Waiting time for CHO evaluation.

[0088] It should be understood that in the second aspect, the interpretation of each information included in the first indication information is consistent with the interpretation of each information included in the first indication information in the first aspect, and will not be repeated here.

[0089] It should be noted that the first configuration information and configuration indication information provide technical support for subsequent terminal devices to determine which primary cell switching mode to execute or how to determine whether to execute primary cell switching or primary cell and primary and secondary cell switching when the LTM candidate primary cell is not associated with the primary and secondary cells.

[0090] In conjunction with the second aspect, in some implementations of the second aspect, the second indication information includes at least one item of second configuration information and at least one item of configuration indication information;

[0091] The second configuration information includes at least one of the following information:

[0092] Configuration information of LTM candidate primary cells;

[0093] The primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0094] Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell;

[0095] The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching;

[0096] The configuration instruction information includes at least one of the following information:

[0097] First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary and secondary cell switching;

[0098] Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover;

[0099] Third configuration indication information, the third configuration indication information is used to instruct the LTM candidate primary cell and the associated primary and secondary cells to be switched together;

[0100] Waiting time for CHO evaluation.

[0101] It should be understood that, unlike the first indication information, the second indication information further includes the primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, the execution conditions for CPC primary and secondary cell switching, and the third configuration indication information. Either of the two additional pieces of information can instruct the terminal device to execute the cell switching strategy to be executed when the LTM candidate primary cell is associated with the primary and secondary cells.

[0102] That is to say, the second configuration information and configuration indication information provide technical support for subsequent terminal devices to determine which primary cell switching mode to execute or how to determine whether to execute primary cell switching or primary cell and primary and secondary cell switching when the LTM candidate primary cell is associated with the primary and secondary cells.

[0103] In combination with the second aspect, in certain implementations of the second aspect, the indication information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

[0104] It should be understood that the embodiment of the present application carries the indication information in the radio resource control RRC reconfiguration information, which reduces the signaling overhead and effectively avoids the waste of communication resources; or carries the indication information in proprietary signaling, which can improve the parsing speed of the indication information.

[0105] It should be understood that the first aspect described above can be combined with the method provided in the second aspect.

[0106] In a third aspect, a cell switching device is provided, comprising modules or units for executing the method in the first aspect and any possible implementation manner of the first aspect.

[0107] In a fourth aspect, a cell switching device is provided, comprising modules or units for executing the method in the second aspect and any possible implementation manner of the second aspect.

[0108] In a fifth aspect, a cell handover apparatus is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the first aspect and any possible implementation of the first aspect. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

[0109] In one implementation, the cell switching device is a terminal device. When the cell switching device is a terminal device, the communication interface may be a transceiver, or an input / output interface.

[0110] In another implementation, the cell switching device is a chip configured in a terminal device. When the cell switching device is a chip configured in a terminal device, the communication interface may be an input / output interface.

[0111] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0112] In a sixth aspect, a cell handover apparatus is provided, comprising a processor. The processor is coupled to a memory and configured to execute instructions in the memory to implement the method of the second aspect and any possible implementation thereof. Optionally, the apparatus further comprises a memory. Optionally, the apparatus further comprises a communication interface, the processor being coupled to the communication interface.

[0113] In one implementation, the cell switching device is a source primary cell network device. When the cell switching device is a source primary cell network device, the communication interface may be a transceiver, or an input / output interface.

[0114] In another implementation, the cell switching device is a chip configured in the source primary cell network device. When the cell switching device is a chip configured in the source primary cell network device, the communication interface may be an input / output interface.

[0115] Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0116] In a seventh aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal via the input circuit and transmit a signal via the output circuit, so that the processor executes the method of any possible implementation of the first to second aspects and any possible implementation of the first to second aspects.

[0117] In a specific implementation, the processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0118] In an eighth aspect, a cell switching apparatus is provided, comprising a processor and a memory. The processor is configured to read instructions stored in the memory, receive signals via a receiver, and transmit signals via a transmitter to execute the method of any possible implementation of the first to second aspects and any possible implementation of the first to second aspects.

[0119] Optionally, there are one or more processors and one or more memories.

[0120] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0121] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated with the processor on the same chip or can be set on different chips. The embodiments of the present application do not limit the type of memory and the setting method of the memory and the processor.

[0122] It should be understood that the relevant data interaction process, such as sending indication information, can be a process of outputting indication information from the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver. The transmitter and receiver can be collectively referred to as a transceiver.

[0123] The cell switching device in the eighth aspect described above may be one or more chips. The processor in the cell switching device may be implemented in hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory. The memory may be integrated into the processor or located independently of the processor.

[0124] In the ninth aspect, an embodiment of the present application provides a terminal device, including a processor, a memory and a transceiver, the transceiver is used to send and receive data, the memory is used to store code instructions, and the processor is used to run the code instructions. When executing the code instructions stored in the memory, the processor is used to instruct the terminal device to execute the method described in the above-mentioned first aspect and any possible implementation method of the first aspect.

[0125] In the tenth aspect, an embodiment of the present application provides a source main cell network device, including a processor, a memory and a transceiver, the transceiver is used to send and receive data, the memory is used to store code instructions, and the processor is used to run the code instructions. When executing the code instructions stored in the memory, the processor is used to instruct the terminal device to execute the method described in the above second aspect and any possible implementation method of the second aspect.

[0126] In the eleventh aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is run on a computer, the computer executes the method described in the first aspect to the second aspect and any possible implementation of the first aspect to the second aspect.

[0127] In a twelfth aspect, the present application provides a chip or chip system, comprising at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a line, and the at least one processor is configured to execute a computer program or instruction to perform the method described in the first aspect or any possible implementation of the first aspect. The communication interface in the chip may be an input / output interface, a pin, or a circuit.

[0128] In one possible implementation, the chip or chip system described above in this application further includes at least one memory, in which instructions are stored. The memory may be a storage unit within the chip, such as a register, a cache, etc., or a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

[0129] In the thirteenth aspect, an embodiment of the present application provides a computer program product comprising a computer program, which, when the computer program runs on a computer, enables the computer to execute the method described in the first aspect to the second aspect and any possible implementation method of the first aspect to the second aspect.

[0130] It should be understood that the third, fifth and ninth aspects of the present application correspond to the technical solution of the first aspect of the present application, the fourth, sixth and tenth aspects of the present application correspond to the technical solution of the second aspect of the present application, and the seventh, eighth, and eleventh to thirteenth aspects of the present application correspond to the technical solutions of the first and second aspects of the present application. The beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0131] FIG1 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0132] FIG2 is an exemplary signaling interaction diagram for performing CHO in the related art;

[0133] FIG3 is a schematic diagram of a related art dual connection scenario;

[0134] FIG4 is an exemplary signaling interaction diagram of performing CPC under dual connectivity in the related art;

[0135] FIG5 is an exemplary signaling interaction diagram for executing CHO and CPC according to an embodiment of the present application;

[0136] FIG6 is a schematic diagram of an exemplary signaling interaction for performing LTM in the related art;

[0137] FIG7 is an exemplary signaling interaction diagram of a cell handover method 200 provided in an embodiment of the present application;

[0138] FIG8 is an exemplary signaling interaction diagram of another cell handover method provided in an embodiment of the present application;

[0139] FIG9 is an exemplary signaling interaction diagram of another cell handover method provided in an embodiment of the present application;

[0140] FIG10 is a schematic block diagram of a cell switching device 10 provided in an embodiment of the present application;

[0141] FIG11 is a schematic diagram of a possible structure of a terminal device 3000 provided in an embodiment of the present application;

[0142] FIG12 is a schematic diagram of a possible structure of a source primary cell network device provided in an embodiment of the present application, for example, a schematic diagram of the structure of a base station 4000 . DETAILED DESCRIPTION

[0143] To facilitate a clear description of the technical solutions of the embodiments of the present application, the words "first" and "second" are used in the embodiments of the present application to distinguish between identical or similar items with substantially the same functions and effects. For example, the first chip and the second chip are merely used to distinguish between different chips and do not limit their order. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean that they are different.

[0144] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0145] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to 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: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, a--c, bc, or abc, where a, b, c can be single or multiple.

[0146] The technical solutions of the embodiments of the present application can be applied to various communication systems. For example, the technical solutions provided in the embodiments of the present application can be applied to the Long Term Evolution (LTE) system, and can also be applied to the LTE Frequency Division Duplex (FDD) system, the LTE Time Division Duplex (TDD) system, the Universal Mobile Telecommunications System (UMTS), the Worldwide Interoperability for Microwave Access (WiMAX) communication system, the UMTS Terrestrial Radio Access Network (UTRAN) system, or the Global System for Mobile Communication (GSM) / Enhanced Data Rate for GSM Evolution (EDGE) system's radio access network (GSM EDGE Radio Access Network, GERAN) system. In addition, the technical solutions provided in the embodiments of the present application can also be applied to any other wireless communication systems with similar structures and functions, such as public land mobile networks (PLMN) systems, fifth generation (5G) communication systems, communication systems after 5G, new radio access technology (NR) systems, vehicle-to-X (V2X) systems, etc.Among them, the V2X system may include a vehicle to Internet (V2N) system, a vehicle to vehicle (V2V) system, a vehicle to infrastructure (V2I) system, a vehicle to pedestrian (V2P) system, a long-term evolution technology for vehicle communication (LTE-V) system, an Internet of Vehicles system, a machine type communication (MTC) system, an Internet of Things (IoT) system, a long-term evolution technology for machine-to-machine communication (LTE-M) system, a machine-to-machine (M2M) system, etc., and the embodiments of the present application do not impose any restrictions on this.

[0147] In order to facilitate a clear description of the technical solution of the embodiment of the present application, a communication system applicable to the embodiment of the present application is exemplified in conjunction with Figure 1. Figure 1 is a schematic diagram of a communication system provided by an embodiment of the present application. As shown in Figure 1, the communication system 100 may include at least two network devices, such as the network device 110 and the network device 120 shown in Figure 1; the communication system 100 may also include at least one terminal device, such as the terminal device 130 shown in Figure 1. The terminal device 130 may be mobile or fixed. Both the network device 110 and the network device 120 are devices that can communicate with the terminal device 130 via a wireless link, and the network device is, for example, a base station or a base station controller. Each network device can cover a cell and provide network services for the cell, and can communicate with terminal devices located in the corresponding coverage cell.

[0148] FIG1 exemplarily shows two network devices and one terminal device. Optionally, the communication system 100 may include at least one network device and the coverage cell of each network device may include other numbers of terminal devices, which is not limited in the embodiments of the present application.

[0149] Each of the above-mentioned communication devices, such as the network device 110 or the network device 120, or the terminal device 130 in Figure 1, can be configured with multiple antennas. The multiple antennas may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals. In addition, each communication device also includes a transmitter chain and a receiver chain. Those skilled in the art will understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers, or antennas, etc.). Therefore, the network device and the terminal device can communicate using multi-antenna technology.

[0150] Optionally, the communication system 100 may further include other network entities such as a network controller and a mobility management entity, but the embodiments of the present application are not limited thereto.

[0151] It should be understood that the terminal device 130 is in the primary cell and the primary and secondary cells at the same time under dual connectivity, and is connected to the source primary cell network device and the source primary and secondary cell network device at the same time. The source primary cell network device is a network device that covers the primary cell and provides network services for the cell, and is also the primary cell network device to which the terminal device 130 is connected before performing the primary cell handover (i.e., currently); the source primary and secondary cell network device is a network device that covers the primary and secondary cells and provides network services for the cell, and is also the primary and secondary cell network device to which the terminal device 130 is connected before performing the CPC primary and secondary cell handover. The structures of the source primary cell network device and the source primary and secondary cell network device may be the same or different.

[0152] Optionally, if the terminal device 130 performs switching between the main cell and the main auxiliary cell under dual connection, the main cell network device to which the terminal device 130 is connected after performing the main cell switching may be referred to as the target main cell network device. The main auxiliary cell network device to which the terminal device 130 is connected after performing the CPC main auxiliary cell switching may be referred to as the target main auxiliary cell network device. The target main cell network device and the source main cell network device are both main cell network devices; the structures of different main cell network devices may be the same or different. The target main auxiliary cell network device and the source main auxiliary cell network device are both main cell network devices; the structures of different main auxiliary cell network devices may be the same or different. Therefore, this embodiment does not specifically limit whether the structures of different network devices covering different cells are the same.

[0153] For example, in the two network devices of Figure 1, network device 110 can be a source primary cell network device, and network device 120 can be a target primary cell network device, or a target primary and secondary cell network device. Optionally, the source primary cell covered by the source primary cell network device can be an LTM candidate primary cell or a CHO candidate primary cell. The target primary cell covered by the target primary cell network device can be an LTM candidate primary cell or a CHO candidate primary cell. Furthermore, the source primary and secondary cells covered by the source primary and secondary cell network device and the target primary and secondary cells covered by the target primary and secondary cell network device can both be CPC primary and secondary cells.

[0154] Based on the fact that the communication system 100 includes at least one network device and at least one terminal device, this embodiment can analyze the network device and the terminal device from the perspective of device architecture as follows:

[0155] 1. Network equipment:

[0156] A network device can be any device with wireless transceiver capabilities. For example, a network device can specifically be, but is not limited to: an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in LTE, a base station (gNodeB or gNB) or a transmission receiving point (TRP) in NR, a radio access network (RAN) device, a base station that has been subsequently evolved by 3GPP, an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. A network device can also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. A network device can also be a server, a wearable device, or an in-vehicle device, etc.

[0157] A base station can be a macro base station, a micro base station, a pico base station, a small base station, a relay station, or a balloon base station. Multiple base stations can support networks using the same or different technologies mentioned above. A base station can include one or more co-located or non-co-located TRPs.

[0158] When there are multiple network devices, the multiple network devices can be of the same type or different types. The network device can communicate with the terminal device or communicate with the terminal device through a relay station. The terminal device can communicate with multiple network devices using different technologies. For example, the terminal device can communicate with a network device supporting an LTE network and a network device supporting a 5G network. It can also support dual connections with network devices on an LTE network and a network device on a 5G network.

[0159] 2. Terminal equipment:

[0160] The terminal devices of the embodiments of the present application may include handheld devices and vehicle-mounted devices with wireless transceiver functions. For example, the terminal devices may specifically be, but are not limited to: mobile phones, mobile phones, tablet computers, PDAs, laptop computers, notebook computers, computers with wireless transceiver functions, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, vehicle-mounted terminal devices, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), and so on. assistant, PDA), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, vehicle-mounted devices, wearable devices, terminal devices in 5G networks, or terminal devices in future evolved public land mobile communication networks (public land mobile network, PLMN), etc., the embodiments of the present application are not limited to this.

[0161] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches, smart helmets, or smart glasses, as well as devices that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0162] In addition, in the embodiment of the present application, the terminal device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0163] The terminal device in the embodiments of the present application may also be referred to as: electronic device, user equipment (UE), mobile station (MS), subscriber unit (SU), mobile terminal (MT), access terminal, access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, user unit, user station, mobile station, mobile station, remote station, remote terminal, remote terminal equipment, mobile device, user terminal, UE terminal equipment, terminal, wireless communication equipment, user agent, UE agent, UE device or user device, etc.

[0164] In the embodiments of the present application, the terminal device or each network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as the Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

[0165] In the embodiments of the present application, network devices and terminal devices may be or may be referred to as communication devices. Therefore, in the embodiments of the present application, wireless communication between network devices and terminal devices, wireless communication between network devices and network devices, and wireless communication between terminal devices and terminal devices may be or may be referred to as wireless communication between communication devices. In the embodiments of the present application, the term "wireless communication" may also be referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission" or "transmission". Those skilled in the art may use the technical solutions provided in the embodiments of the present application for wireless communication between network devices and terminal terminals, such as wireless communication between access network devices and terminal devices, and wireless communication between core network devices and terminal devices.

[0166] For terminal devices in the RRC connection state (i.e., connected state), under dual connection, when the quality of the wireless link of the source primary cell or the source primary and secondary cells is poor, there are candidate primary cells or candidate primary and secondary cells with better service quality, or load balancing is required, switching will be triggered. The entire switching process includes three stages: switching preparation, switching execution, and switching completion. The related technologies provide switching methods for the source primary cell, including: LTM, CHO, etc. In addition, the source primary cell can configure the configuration information of the LTM candidate primary cell and the CHO candidate primary cell for the terminal device at the same time, that is, LTM and CHO are in a coexistence state.

[0167] I. Related Art This section describes the mobility mechanisms before the Rel-18 standard (including CHO introduced in the Rel-16 standard, CPC introduced in the Rel-17 standard, and LTM).

[0168] (1) CHO is described as follows:

[0169] The Rel-16 standard introduces CHO. Under dual connectivity, the communication devices involved in CHO primary cell switching include: terminal equipment, source primary cell network equipment, target primary cell network equipment and potential target primary cell network equipment.

[0170] It should be understood that the source primary cell network device is a network device that covers the CHO source primary cell and provides network services for the CHO source primary cell; the target primary cell network device is a network device that covers the CHO target primary cell and provides network services for the CHO target primary cell; the potential target primary cell network device is a network device that covers the CHO potential target primary cell and provides network services for the CHO potential target primary cell. In conjunction with the above-mentioned communication equipment, an exemplary signaling interaction diagram for performing CHO in the related technology is shown in Figure 2:

[0171] S21, the terminal device reports the measurement results to the source primary cell network device.

[0172] S22: The source primary cell network device decides whether to execute CHO.

[0173] It should be understood that if the decision result is to determine to execute CHO, S23 is executed.

[0174] S23: The source primary cell network device sends a CHO primary cell handover request to the candidate primary cell network device.

[0175] The candidate primary cell network devices include the target primary cell network device and the potential target primary cell network device.

[0176] S24, the candidate primary cell network device sends a CHO primary cell handover request response.

[0177] Among them, S23 and S24 enable the source primary cell network device to obtain the configuration information of the CHO candidate primary cell and the execution condition of the CHO primary cell switching. The above-mentioned CHO candidate primary cells can be configured with a maximum of 8.

[0178] S25, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0179] The RRC reconfiguration information carries the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell handover, so that the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell handover are sent to the terminal device through the RRC reconfiguration information. One or two execution conditions (for example, including events A3 / A5) are configured for each CHO candidate primary cell. Event A3: The quality of the CHO candidate primary cell is better than that of the CHO source primary cell. The occurrence of this event will trigger a handover. Event A5: The quality of the CHO source primary cell is less than an absolute threshold, and the quality of the CHO candidate primary cell is higher than an absolute threshold. The occurrence of this event will trigger a handover.

[0180] S26, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device.

[0181] S27, the terminal device performs CHO evaluation.

[0182] S27 is to evaluate whether there is a CHO candidate primary cell that meets the CHO primary cell switching execution condition. When at least one CHO candidate primary cell meets the CHO primary cell switching execution condition, S28 is executed.

[0183] S28, the terminal device disconnects from the source primary cell network device.

[0184] S29, access to the target primary cell network device.

[0185] That is, the terminal device performs CHO. After completing the CHO primary cell switching, the terminal device may release the configuration information of the CHO candidate primary cell and the execution conditions of the CHO primary cell switching.

[0186] (2) CPC is described as follows:

[0187] In dual connectivity, the terminal device is not only involved in the switching of the primary cell, but also in the switching of the primary and secondary cells. The Rel-17 standard introduces CPC. In dual connectivity, the terminal device is often involved in the switching of CPC primary and secondary cells due to changes in service conditions or channel quality. When the service conditions or channel quality change, it is determined to perform CPC primary and secondary cell switching. After that, the source primary cell network device initiates a request to add a secondary new radio NodeB (SgNB) between network devices to obtain the configuration information of the candidate primary and secondary cells and the execution conditions for CPC primary and secondary cell switching. The source primary cell network device then configures multiple candidate primary and secondary cells and the execution conditions for CPC primary and secondary cell switching to the terminal device. The terminal device evaluates whether there are candidate primary and secondary cells that meet the execution conditions for CPC primary and secondary cell switching. When it is evaluated that at least one candidate primary and secondary cell meets the corresponding CPC primary and secondary cell switching execution conditions, the terminal device initiates a random access process to the target primary and secondary cell network device to complete the CPC primary and secondary cell switching.

[0188] As shown in Figure 3, in the dual-connected DC scenario, the master cell group (MCG) and the secondary cell group (SCG) are involved. The MCG includes the source master cell and the secondary cell (Scell), and the secondary cell group includes the source master and secondary cells. Taking the source master cell network device covering the source master cell triggering CPC as an example, the specific execution process is shown in Figure 4:

[0189] S41: The source primary cell network device sends an SgNB add request to the candidate primary and secondary cell network devices.

[0190] The candidate primary and secondary cell network devices include target primary and secondary cell network devices and potential target primary and secondary cell network devices.

[0191] S42. The candidate primary and secondary cell network equipment sends an SgNB add request response to the source primary cell network equipment.

[0192] Among them, S41 and S42 enable the source primary cell network device to obtain the configuration information of the candidate primary and secondary cells and the execution conditions of the CPC primary and secondary cell switching.

[0193] S43, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0194] Among them, the RRC reconfiguration information carries the configuration information of the candidate primary and secondary cells and the execution conditions for the CPC primary and secondary cell switching. Therefore, the source primary cell network device can send the configuration information of the candidate primary and secondary cells and the execution conditions for the CPC primary and secondary cell switching to the terminal device through the RRC reconfiguration information.

[0195] S44, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device and executes S45.

[0196] The RRC reconfiguration completion message may also be referred to as a first message.

[0197] S45, the terminal device performs CPC evaluation.

[0198] Wherein, S45 is to evaluate whether there are candidate primary and secondary cells that meet the CPC primary and secondary cell switching execution conditions. When at least one candidate primary and secondary cell meets the corresponding CPC primary and secondary cell switching execution conditions, step S46 is executed.

[0199] S46, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device.

[0200] The RRC reconfiguration complete message indicates different information from the RRC reconfiguration complete message in S44 and can be referred to as a second message. The RRC reconfiguration complete message in this step is used to indicate the target primary and secondary cells and the target primary and secondary cell network devices to the source primary cell network device. After receiving this indication, the source primary cell network device executes S47 and S49.

[0201] S47, the source primary cell network device sends an SgNB release request to the source primary and secondary cell network devices and the potential target primary and secondary cell network devices.

[0202] S48. The source primary and secondary cell network equipment and the potential target primary and secondary cell network equipment send an SgNB release confirmation message to the source primary cell network equipment.

[0203] S49, the source primary cell network device sends an RRC reconfiguration completion message to the target primary and secondary cell network devices.

[0204] Among them, the RRC reconfiguration completion message is different from the RRC reconfiguration completion message in S46 and can be called a third message.

[0205] S50, the terminal device initiates a random access process to the target primary and secondary cell network devices.

[0206] Among them, S50 completes CPC primary and secondary cell switching. For conditional primary and secondary cell changes between different cell groups (inter-SN CPC) triggered by the source primary cell network device, the execution condition can be event A4: (the quality of the candidate primary and secondary cells is better than an absolute threshold). For conditional primary and secondary cell changes within the same cell group (intra-SN CPC) triggered by the source primary cell network device, the execution condition can be events A3 and / or A5.

[0207] Since in dual connectivity, the terminal device is involved in not only the switching of the primary cell but also the switching of the primary and secondary cells, in the dual connectivity scenario, it is necessary to consider the switching of the primary cell and the primary and secondary cells at the same time.

[0208] In the related art, the coexistence of CPO and CPC is described as follows:

[0209] The source primary cell network device configures the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell switching, and also configures the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for the CPC primary and secondary cell switching. The terminal device evaluates whether there is a CHO candidate primary cell that meets the execution conditions for the CHO primary cell switching and a candidate primary and secondary cell that meets the execution conditions for the CPC primary and secondary cell switching; when there is a CHO candidate primary cell and at least one associated primary and secondary cell that meets the corresponding execution conditions, the terminal device will execute the primary cell switching and the primary and secondary cell switching, as shown in Figure 5:

[0210] S51 : The source primary cell network device sends a CHO primary cell handover request and a CPC primary / secondary cell handover request to the candidate primary cell network device.

[0211] The CPC primary / secondary cell handover request is used to request the candidate primary cell network device to obtain the configuration information of the primary / secondary cell associated with the corresponding CHO candidate primary cell and the execution conditions of the CPC primary / secondary cell handover.

[0212] S52: The candidate primary cell network device sends an SgNB add request to the candidate primary and secondary cell network devices associated with it.

[0213] It should be understood that the candidate primary and secondary cell network devices include target primary and secondary cell network devices and potential target primary and secondary cell network devices, wherein the target primary and secondary cell network devices are associated with the target primary cell network device, and the potential target primary and secondary cell network devices are associated with the potential target primary cell network device.

[0214] S53, the candidate primary and secondary cell network equipment sends an SgNB add request response to the candidate primary cell network equipment.

[0215] Among them, S53 enables the candidate primary cell network device to obtain the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions of the CPC primary and secondary cell switching. The CHO candidate primary cells are the CHO target primary cell and the CHO potential target primary cell, and the primary and secondary cells associated with the CHO candidate primary cell are the target primary and secondary cells and the potential target primary and secondary cells.

[0216] S54 , the candidate primary cell network device sends a CHO primary cell handover request and a CPC primary / secondary cell handover request response to the source primary cell network device.

[0217] Among them, S54 sends the acquired configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for CPC primary and secondary cell switching, as well as the configuration information of the CHO candidate primary cell and the execution conditions for CHO primary cell switching to the source primary cell network device.

[0218] S55, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0219] The RRC reconfiguration information carries the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell switching, as well as the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for the CPC primary and secondary cell switching.

[0220] S56, the terminal device performs CHO and CPC evaluation.

[0221] It should be understood that S56 is to evaluate whether there are CHO candidate primary cells that meet the execution conditions for CHO primary cell switching and candidate primary and secondary cells that meet the execution conditions for CPC primary and secondary cell switching. S57 is executed when it is evaluated that at least one CHO candidate primary cell and its associated primary and secondary cells meet their respective execution conditions.

[0222] S57, the terminal device initiates a random access process to the target primary cell network device.

[0223] It should be understood that S57 indicates the target primary and secondary cells to the target primary cell network device during the random access process, wherein the target primary and secondary cells are the primary and secondary cells associated with the CHO target primary cell selected by the terminal device.

[0224] S58 , the target primary cell network device executes the resource release process of the source primary and secondary cell network devices and the resource release process of the potential target primary and secondary cell network devices.

[0225] S59: The target primary cell network device sends an RRC reconfiguration completion message to the target primary and secondary cell network devices.

[0226] Among them, the RRC reconfiguration completion message is used to indicate that the terminal device will access the target primary and secondary cell network equipment.

[0227] S60, the terminal device initiates a random access process to the target primary and secondary cell network devices.

[0228] It should be noted that if the CHO target primary cell meets the corresponding execution conditions, the potential target primary and secondary cells also meet the corresponding execution conditions, and the CHO target primary cell and the potential target primary and secondary cells are not associated, then in the execution process, the source primary cell network device can first execute the CHO primary cell switching, and then the target primary cell network device adds the potential target primary and secondary cells to establish an association between the two, and then execute the CPC primary and secondary cell switching.

[0229] (3) The LTM is described as follows:

[0230] In dual connectivity, the communication devices involved in LTM primary cell handover include the terminal device, the source primary cell network device, the target primary cell network device, and the potential target primary cell network device. As shown in Figure 6:

[0231] S61, the terminal device reports the measurement results to the source primary cell network device.

[0232] Among them, the terminal device is in the RRC connection state when reporting to the source main cell network device.

[0233] S62: The source primary cell network device determines the terminal device's support capability for LTM based on the measurement result.

[0234] It should be understood that based on the terminal device's support capability for LTM, if it is determined to execute LTM, S63 is executed.

[0235] S63: The source primary cell network device sends an LTM primary cell handover request to the candidate primary cell network device.

[0236] The candidate primary cell network devices include target primary cell network devices and potential target primary cell network devices.

[0237] S64: The candidate primary cell network device sends an LTM primary cell handover request response to the source primary cell network device.

[0238] Among them, S64 is to send the configuration information of the corresponding configured LTM candidate primary cell to the source primary cell network device.

[0239] S65, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0240] The RRC reconfiguration information carries the configuration information of the LTM candidate primary cell, so the source primary cell network device can send the configuration information of the LTM candidate primary cell to the terminal device through the RRC reconfiguration information. After receiving the configuration information of the LTM candidate primary cell, the terminal device executes S66.

[0241] S66, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device.

[0242] Among them, after the terminal device sends the RRC reconfiguration completion message to the source primary cell network device, it executes S67 and S68.

[0243] S67, the terminal device performs downlink synchronization for each candidate primary cell network device.

[0244] S68, the terminal device performs uplink synchronization for each candidate primary cell network device.

[0245] In which, during the process of performing uplink synchronization for each candidate primary cell network device, if the RRC reconfiguration information indicates that the terminal device measures the timing advance (TA) by itself, then it measures the timing advance of the source primary cell network device and determines the timing advance of the candidate primary cell network device based on the reception time difference between the source primary cell network device and the candidate primary cell network device; or, the source primary cell network device triggers contention free random access (CFRA) through a physical downlink control channel command (PDCCH) order to obtain the timing advance of the candidate primary cell network device, and the terminal device initiates CFRA to the candidate primary cell network device to obtain the timing advance of the candidate primary cell network device, and then the source primary cell network device determines the validity of the timing advance.

[0246] After the uplink synchronization is completed, the terminal device performs layer 1 measurement on the source primary cell network device and the candidate primary cell network device to obtain an L1 measurement result, and then executes S69. It should be understood that layer 1 is L1.

[0247] S69, the terminal device reports the LI measurement results to the source primary cell network device.

[0248] It should be understood that after the terminal device reports the LI measurement result to the source primary cell network device, the source primary cell network device determines the target primary cell network device according to the LI measurement result.

[0249] S70, the source primary cell network device sends an LTM switching instruction to the terminal device.

[0250] The LTM handover instruction is a Medium Access Control (MAC) control element (CE). The MAC CE includes at least the following information: TA, Transmission Configuration Indication State (TCI State) sequence number (IDentity ID), CFRA resource information, and LTM candidate primary cell configuration information identifier. For the TA, if the source primary cell network device determines that the TA previously obtained by the terminal device is still valid, then the TA can be included in the MAC CE.

[0251] S71, the terminal device disconnects from the source primary cell network device.

[0252] S72, the terminal device initiates a random access process to the target primary cell network device.

[0253] When the terminal device receives a MAC CE, if the MAC CE carries a TA, or the terminal device detects the TA by itself, the terminal device initiates a handover without random access to the target primary cell network device, that is, the terminal device sends an uplink signaling or the first uplink data packet to the target primary cell network device, which is used to indicate to the target primary cell network device that it has accessed the target primary cell network device to complete the LTM primary cell handover.

[0254] 2. Related Technology describes the relevant conclusions on the coexistence of CHO and CPC in the Rel-18 standard, namely: when two switching modes CHO and CPC, as well as one switching mode CHO, are configured at the same time, if the corresponding execution conditions are met, CHO and CPC will be executed first.

[0255] In dual connectivity, CHO and CPC coexist. To improve the success rate of the entire handover process, LTM can be configured in addition. However, this will lead to the coexistence of LTM with CHO and / or CPC.

[0256] Regarding the coexistence of LTM with CHO and / or CPC, how to determine which cell to switch to and which cell switching method to execute for a terminal device, thereby avoiding cell switching conflicts and improving the success rate of cell switching, is an urgent problem to be solved. To this end, the embodiment of the present application proposes a cell switching method, the main inventive ideas of which are as follows:

[0257] The source primary cell network device pre-indicates the cell switching strategy under the coexistence of LTM and CHO and / or CPC, so that the terminal device performs cell switching based on the switching strategy. This can standardize the switching action of the terminal device during cell switching and avoid switching conflicts between different switching methods.

[0258] The technical solutions shown in this application are described in detail below through specific embodiments. It should be noted that the following embodiments can exist independently or in combination with each other. For the same or similar content, such as the explanation of terms or nouns, and the explanation of steps, etc., different embodiments can refer to each other and will not be repeated.

[0259] FIG7 is an exemplary signaling interaction diagram of a cell switching method 200 provided in an embodiment of the present application. As shown in FIG7 , the cell switching method 200 includes:

[0260] S201, the source primary cell network device sends indication information to the terminal device.

[0261] It should be understood that the specific forms of the source primary cell network equipment and terminal equipment can refer to the above-mentioned relevant descriptions and will not be repeated here.

[0262] The following describes the instructions in detail.

[0263] The indication information is used to indicate the cell handover strategy under the coexistence of mobility LTM triggered at layer 1 / 2 and conditional handover CHO and / or conditional primary and secondary cell change CPC.

[0264] Therefore, the situation where LTM coexists with CHO and / or CPC indicated in the indication information is a situation where the terminal device receives an LTM switching instruction sent by the source primary cell network device when evaluating that at least one of CPC and CHO meets the execution conditions.

[0265] Then, in order to adapt to the situation where LTM coexists with CHO and / or CPC, in one example, the cell switching strategy indicated in the indication information may include: a switching strategy for executing primary cell switching or a switching strategy for executing primary and secondary cells or a switching strategy for executing primary and secondary cell switching. Specifically, the indication information may include a primary cell switching method to be executed when LTM primary cell switching and CHO primary cell switching can be executed. Whether to execute the switching of the primary cell and the primary and secondary cells at the same time when LTM primary cell switching and CPC primary and secondary cell switching can be executed. Whether to execute the switching of the primary cell and the primary and secondary cells at the same time when LTM primary cell switching and CHO primary cell switching and CPC primary and secondary cell switching can be executed, and a primary cell switching method to be executed when the primary cell switching is to be executed.

[0266] In another example, the indication information may include at least one parameter of a handover strategy, such as the priority of a primary cell handover and a CPC primary / secondary cell handover, and the priority of two primary cell handover modes.

[0267] It should be understood that the specific form of the indication information can be any form that represents the cell switching strategy under the coexistence of LTM and CHO and / or CPC, such as numbers or fields or other forms, and this application does not limit this.

[0268] The transmission method of the indication information is not limited in this embodiment.

[0269] In one example, the indication information is carried in a radio resource control (RRC) reconfiguration message, meaning that the indication information is sent to the terminal device via the RRC reconfiguration message. Therefore, when obtaining the configuration information of the candidate primary cell (CHO) and the execution conditions for switching the CHO primary cell, and / or the configuration information of the candidate primary and secondary cells and the execution conditions for switching the CPC primary and secondary cells via the RRC reconfiguration message, the indication information can also be obtained via the RRC reconfiguration message. This effectively avoids wasting communication resources.

[0270] In another example, the indication information is carried in proprietary signaling. Dedicated signaling is signaling specifically for transmitting indication information and can be a redefined signaling format. The proprietary signaling can be sent to the terminal device before evaluating whether at least one of the CPC and CHO conditions has been met. For example, it can be sent to the terminal device at the same time as the RRC reconfiguration information. Using proprietary signaling to transmit indication information can speed up the parsing of the indication information.

[0271] In another example, the indication information may be carried in MAC CE signaling or downlink control information (Downlink Control Information, DCI).

[0272] Here, "sending simultaneously" can be a time point or a time period, which is not limited in this application.

[0273] S202: The terminal device performs cell switching according to the indication information.

[0274] It should be understood that S202 may be any one of S202a, S202b, S202c, S202d or S202e in FIG. 7 .

[0275] It should also be understood that when LTM coexists with CHO and / or CPC, the source primary cell network device sends an LTM handover instruction to the terminal device. This LTM handover instruction is sent when the terminal device evaluates that at least one of CPC and CHO meets the execution conditions. Therefore, the source primary cell network device sending the LTM handover instruction to the terminal device can provide an alternative primary cell handover method in addition to the CHO primary cell handover method, thereby improving the comprehensiveness and selectivity of the primary cell handover strategy.

[0276] Specifically, as described above, in the case where LTM coexists with CHO and / or CPC, performing cell handover according to the indication information may include:

[0277] If at least one of CPC and CHO meets the execution condition and receives the LTM switching instruction sent by the source primary cell network device, the switching of the primary cell or the switching of the primary cell and the primary and secondary cells is executed according to the instruction information.

[0278] Alternatively, if the CPC meets the execution conditions and receives an LTM switching instruction sent by the source primary cell network device, the switching of the primary and secondary cells is performed according to the instruction information.

[0279] In dual-connectivity communication scenarios, the LTM mechanism for the primary cell group can be divided into two types: one in which the LTM candidate primary cell is not associated with the primary and secondary cells, and the other in which the LTM candidate primary cell is associated with the primary and secondary cells. For these two different scenarios, the indication information required for the terminal device will be different. Accordingly, under different indication information, the coexistence of LTM with CHO and / or CPC will also be different, and the subsequent method of performing cell handover based on the indication information will also be different.

[0280] The following describes the indication information in two scenarios, the coexistence of LTM and CHO and / or CPC, and the cell handover performed.

[0281] In the first scenario, the indication information is first indication information, which is indication information when the LTM candidate primary cell is not associated with the primary and secondary cells. The first indication information includes at least one first configuration information and at least one configuration indication information.

[0282] The first configuration information includes at least one of the following information:

[0283] (1) Configuration information of the candidate LTM primary cell; (2) Configuration information of the candidate CHO primary cell and the execution conditions for switching the CHO primary cell; (3) Primary and secondary cells associated with the candidate CHO primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for switching the CPC primary and secondary cells.

[0284] The configuration instruction information includes at least one of the following information:

[0285] (4) First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed in priority compared to CPC primary and secondary cell switching; (5) Second configuration indication information, the second configuration indication information is used to indicate that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, or the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching; (6) Waiting time for CHO evaluation.

[0286] The following describes each of these:

[0287] (1) The configuration information of the LTM candidate primary cell includes, but is not limited to, the cell offset of the LTM candidate primary cell, the maximum number of users of the LTM candidate primary cell, the transmit power of the LTM candidate primary cell, etc. The embodiments of the present application can adaptively add or delete specific content in the configuration information of the LTM candidate primary cell. Therefore, this embodiment does not specifically limit the specific content of the configuration information of the LTM candidate primary cell. The configuration information of the LTM candidate primary cell can provide effective information when the terminal device performs LTM primary cell handover, thereby improving the effectiveness of handover to the LTM target primary cell.

[0288] (2) The configuration information of the CHO candidate primary cell includes but is not limited to: the cell offset of the CHO candidate primary cell, the maximum number of users of the CHO candidate primary cell, the transmission power of the CHO candidate primary cell, etc.; the embodiments of the present application can adaptively add or delete specific content in the configuration information of the CHO candidate primary cell, so this embodiment does not specifically limit the specific content of the configuration information of the CHO candidate primary cell. The configuration information of the CHO candidate primary cell can provide effective information when the terminal device performs CHO primary cell switching, thereby improving the effectiveness of switching to the CHO target primary cell.

[0289] The execution condition for CHO primary cell switching is the basis for the terminal device to evaluate CHO candidate primary cells. The execution condition for CHO primary cell switching is referred to as the CHO execution condition. The above CHO execution condition can refer to the execution condition: at least one of events A3, A4, or A5. This embodiment does not specifically limit the specific content of the execution condition.

[0290] It should be understood that since the CHO candidate primary cell can be one or more, when there are multiple CHO candidate primary cells, the source primary cell network device can configure the same execution conditions for different CHO candidate primary cells, or configure different execution conditions for different CHO candidate primary cells. This embodiment does not make specific limitations on this.

[0291] It should also be understood that the evaluation process of evaluating whether there is a CHO candidate primary cell that meets the execution conditions of the CHO primary cell switching can refer to the relevant technology, and the embodiment of the present application does not elaborate on the evaluation process of the CHO candidate primary cell.

[0292] (3) The configuration information of the primary and secondary cells associated with the CHO candidate primary cell includes but is not limited to: the cell offset of the associated primary and secondary cells, the maximum number of users of the associated primary and secondary cells, the transmission power of the associated primary and secondary cells, etc.; the embodiment of the present application can adaptively add or delete the specific content in the configuration information of the CPC primary and secondary cells, so this embodiment does not specifically limit the specific content of the configuration information of the CPC primary and secondary cells. The configuration information of the CPC primary and secondary cells can provide effective information when the terminal device performs the CPC primary and secondary cell handover, thereby improving the effectiveness of the handover to the CPC primary and secondary cells.

[0293] The CPC primary / secondary cell handover execution condition is the basis for the terminal device to evaluate the CPC primary / secondary cell. The CPC primary / secondary cell handover execution condition can be referred to as the CPC execution condition. The CPC execution condition can refer to at least one of Events A3, A4, or A5. This embodiment does not specifically limit the specific content of the execution condition.

[0294] It should be understood that since the CPC primary and secondary cells associated with the CHO candidate primary cell can be one or more CPC primary and secondary cells, when there are multiple CPC primary and secondary cells, the source primary cell network equipment can configure the same execution conditions for different CPC primary and secondary cells, or configure different execution conditions for different CPC primary and secondary cells. This embodiment does not make specific limitations on this.

[0295] It should also be understood that the evaluation process for evaluating whether the CPC primary and secondary cells meet the execution conditions for CPC primary and secondary cell switching can refer to relevant technologies, and the embodiment of the present application does not elaborate on the evaluation process.

[0296] It should be noted that, when there are multiple CHO candidate primary cells, the first configuration information may include the primary and secondary cells associated with the CHO candidate primary cell configured by the source primary cell network device for each CHO candidate primary cell, and may also include the primary and secondary cells associated with the CHO candidate primary cell configured by the source primary cell network device for some of the CHO candidate primary cells, that is, the source main cell network device may not configure the primary and secondary cells associated with the CHO candidate primary cell for another part of the CHO candidate primary cells, and this embodiment does not make any specific limitations on this.

[0297] (4) The first configuration indication information is used to indicate the priority between executing a primary cell handover and executing a CPC primary and secondary cell handover. In addition to being used to indicate that an LTM or CHO primary cell handover should be executed in priority over a CPC primary and secondary cell handover, the first configuration indication information can also be used to indicate that a CPC primary and secondary cell handover should be executed in priority over an LTM or CHO primary cell handover. When a primary cell handover conflicts with a CPC primary and secondary cell handover, the terminal device can effectively determine the cell handover method to be executed based on the first configuration indication information.

[0298] (5) The second configuration indication information is used to indicate which of the LTM primary cell handover and the CHO primary cell handover has a higher priority in the primary cell handover. When both meet the corresponding execution conditions, the terminal device can effectively determine the primary cell handover mode to be executed based on the second configuration indication information.

[0299] (6) The waiting time for CHO evaluation may be the time for the terminal device to evaluate whether the CHO candidate primary cell meets the CHO execution conditions when the CPC primary and secondary cells meet the execution conditions for CPC primary and secondary cell switching or receive the LTM switching instruction sent by the source primary cell network device. The embodiment of the present application does not specifically limit the numerical value of this time, for example: 1 millisecond, 2 milliseconds, etc.

[0300] It should be understood that the waiting time for CHO evaluation has a starting time. For example, it can be started by the timer on the terminal device when the terminal device evaluates that at least one CPC primary and secondary cell meets the execution conditions for CPC primary and secondary cell switching and the CHO receives the LTM switching instruction sent by the source primary cell network device during the evaluation process; it can also be started when the terminal device evaluates that at least one CPC primary and secondary cell meets the execution conditions for CPC primary and secondary cell switching. This embodiment does not specifically limit its starting time.

[0301] It should also be understood that the specific forms of the first indication information, such as the configuration information of the LTM candidate primary cell, the configuration information of the CHO candidate primary cell and the execution conditions of the CHO primary cell switching, the primary and secondary cells associated with the CHO candidate primary cell, and the configuration information of the associated primary and secondary cells and the execution conditions of the CPC primary and secondary cell switching, the first configuration indication information, the second configuration indication information, the waiting time for CHO evaluation, etc., can be any form of cell switching strategy that represents the coexistence of LTM and CHO and / or CPC, when the LTM candidate primary cell is not associated with the primary and secondary cells, such as numbers or fields or other forms. This application does not limit this.

[0302] The above is an explanation of the specific content of the first indication information. In addition, as mentioned above, the transmission method of the first indication information can be carried in the radio resource control RRC reconfiguration information or dedicated signaling, which will not be repeated here.

[0303] In the first scenario, after the terminal device receives the first indication information, the coexistence of LTM and CHO and / or CPC may include any of the following situations:

[0304] Case 1: When it is evaluated that the execution conditions for CPC primary-slave cell switching are met and the CHO is in the evaluation process, it receives an LTM switching instruction sent by the source primary cell network device.

[0305] Case 2: When it is evaluated that the execution conditions for CHO primary cell handover are met, an LTM handover instruction sent by the source primary cell network device is received.

[0306] Case 3: When it is evaluated that the execution conditions for CHO primary cell switching and CPC primary / supplementary cell switching are met, an LTM switching instruction sent by the source primary cell network device is received.

[0307] Case 4: When evaluating that the execution conditions for CHO primary cell switching are met and / or the execution conditions for CHO primary cell switching are met, the LTM switching instruction sent by the source primary cell network device is received, and the switching instructions of other cell change mechanisms that can be implemented in the future are also received.

[0308] The cell switching performed in different situations specifically includes:

[0309] If situation 1 is met, the switching of the primary cell or the switching of the primary cell and the primary and secondary cells is performed according to the first indication information.

[0310] Alternatively, if condition 2 is met, the switching of the primary cell is performed according to the first indication information.

[0311] Alternatively, if condition 3 is met, CHO primary cell switching and CPC primary and secondary cell switching are performed according to the first indication information.

[0312] The following describes in detail the content of the first indication information required in each case and the corresponding switching method.

[0313] In any of the above situations 1-4, the first configuration information in the first indication information includes: configuration information of the LTM candidate primary cell; configuration information of the CHO candidate primary cell and execution conditions for CHO primary cell switching; primary and secondary cells associated with the CHO candidate primary cell, configuration information of the associated primary and secondary cells, and execution conditions for CPC primary and secondary cell switching. Alternatively, the first configuration information includes at least one of the above items and the other items are already stored in the terminal device.

[0314] Specifically, when the above-mentioned condition 1 is met, the configuration indication information of the first indication information includes at least the first configuration indication information and may also include the waiting time for CHO evaluation. When the above-mentioned condition 2 is met, the configuration indication information of the first indication information includes at least the second configuration indication information. When the above-mentioned condition 3 is met, the configuration indication information of the first indication information includes at least the second configuration indication information. When the above-mentioned condition 4 is met, the configuration indication information of the first indication information includes the first configuration indication information, the second configuration indication information, and the waiting time for CHO evaluation.

[0315] Accordingly, when condition 1 is met, the cell switching method is specifically as follows:

[0316] If the LTM target primary cell to be switched in the LTM handover instruction is a CHO candidate primary cell, S202a in Figure 7 is executed to perform LTM primary cell handover and CPC primary / secondary cell handover, and evaluation of CHO candidate primary cells is stopped. If the LTM target primary cell is not a CHO candidate primary cell, S202b in Figure 7 is executed based on the first configuration indication information to perform LTM primary cell handover. Alternatively, if the LTM target primary cell is not a CHO candidate primary cell, the LTM handover instruction is suspended and evaluation of CHO candidate primary cells continues. If the execution conditions for CPC primary / secondary cell handover are met, the CHO evaluation waiting time is started. If a CHO candidate primary cell that meets the CHO primary cell handover execution conditions is found before the CHO evaluation waiting time expires, S202c in Figure 7 is executed to perform CHO primary cell handover and CPC primary / secondary cell handover. If no CHO candidate primary cell that meets the CHO primary cell handover execution conditions is found before the CHO evaluation waiting time expires, S202b in Figure 7 is executed to perform LTM primary cell handover.

[0317] The first condition is that the LTM target primary cell switched in the LTM switching instruction is a CHO candidate primary cell. The second condition is that the LTM target primary cell is not a CHO candidate primary cell. The third condition is that the waiting CHO evaluation time is started when the execution conditions for CPC primary-secondary cell switching are met, and a CHO candidate primary cell that meets the execution conditions for CHO primary cell switching is found before the waiting CHO evaluation time expires.

[0318] In other words, when situation 1 is met, LTM primary cell handover and CPC primary and secondary cell handover are performed when the first condition is met. Alternatively, LTM primary cell handover is performed when the second condition is met. Alternatively, CHO primary cell handover and CPC primary and secondary cell handover are performed when both the second and third conditions are met.

[0319] Specifically, in case 1, the LTM target primary cell switched in the LTM switching instruction is the CHO candidate primary cell, and the CHO is in the evaluation process. The terminal device cannot perform the CHO primary cell switching, so the LTM primary cell switching and the CPC primary and secondary cell switching can be performed. Under dual connection, the terminal device performs the LTM primary cell switching and the CPC primary and secondary cell switching operations, which is easy to meet the coverage requirements of the terminal device. Therefore, when the LTM target primary cell switched in the LTM switching instruction is the CHO candidate primary cell, the LTM primary cell switching and the CPC primary and secondary cell switching can be performed first. On this basis, the embodiment of the present application stops evaluating the CHO candidate primary cell, which can save the computing resources of the terminal device.

[0320] It should be understood that when the LTM target primary cell is not a CHO candidate primary cell, the LTM primary cell handover conflicts with the CPC primary and secondary cell handover, and the terminal device cannot determine whether to perform the primary cell handover or the CPC primary and secondary cell handover. When the first indication information includes the first configuration indication information, the terminal device can determine which cell to perform the handover based on this, effectively improving the handover success rate.

[0321] It should also be understood that the embodiments of the present application provide different optional primary cell switching strategies for the terminal device when the LTM target primary cell is not a CHO candidate primary cell. As an optional method, the evaluation of the CHO candidate primary cell can be stopped to perform the LTM primary cell switching. As another optional method, the LTM switching instruction can be suspended to continue the evaluation of the CHO candidate primary cell, so as to perform the CHO primary cell switching and the CPC primary and secondary cell switching when the third condition is met. Therefore, the comprehensiveness and selectivity of the switching strategy when the LTM target primary cell is not a CHO candidate primary cell are improved, and the cell switching when the LTM target primary cell is not a CHO candidate primary cell is made more flexible.

[0322] When condition 2 is met, the cell switching method is as follows:

[0323] If the second configuration indication information indicates that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, S202b in Figure 7 is executed to perform the LTM primary cell handover. Alternatively, if the second configuration indication information indicates that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover, S202d in Figure 7 is executed to perform the CHO primary cell handover.

[0324] Among them, the second configuration indication information indicates that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching as the fourth condition, and the second configuration indication information indicates that the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching as the fifth condition.

[0325] So in other words, when case 2 is met, LTM primary cell switching is performed when the fourth condition is met, or CHO primary cell switching is performed when the fifth condition is met.

[0326] When situation 2 is satisfied, since the terminal device can perform both LTM primary cell switching and CHO primary cell switching, the two primary cell switching methods, LTM primary cell switching and CHO primary cell switching, conflict, and the terminal device cannot determine whether to perform LTM primary cell switching or CHO primary cell switching. When the first indication information includes the second configuration indication information, the terminal device can determine which primary cell switching method to use for the switching of the primary cell based on this, that is, when the second configuration indication information indicates that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, it is determined to perform LTM primary cell switching. When the second configuration indication information indicates that the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching, it is determined to perform CHO primary cell switching. Therefore, the second configuration indication information can enable the terminal device to determine which primary cell switching method to perform, effectively improving the switching success rate of the primary cell.

[0327] When condition 3 is met, S202c in FIG7 is executed to perform CHO primary cell switching and CPC primary and secondary cell switching.

[0328] It should be understood that in case 3, the terminal device can perform LTM primary cell switching, and can also perform CHO primary cell switching and CPC primary and secondary cell switching, CPC primary and secondary cell switching, LTM primary cell switching and CPC primary and secondary cell switching, etc. Therefore, there is a conflict in which cell switching is to be performed in case 3, and there is also a conflict in which primary cell switching method is to be performed. The embodiment of the present application gives priority to executing the cell switching strategy of CHO primary cell switching and CPC primary and secondary cell switching when case 3 is met, which can effectively improve the switching success rate.

[0329] It should be noted that the first configuration indication information may also indicate that CPC primary and secondary cell switching is performed preferentially over LTM or CHO primary cell switching.

[0330] Therefore, as another implementation method, if situation 1 is met, it may further include: executing switching of the primary and secondary cells according to the first indication information.

[0331] Accordingly, when situation 1 is met, the specific manner of performing switching of the primary and secondary cells according to the first indication information is:

[0332] If the LTM target primary cell switched in the LTM switching instruction is not a CHO candidate primary cell, based on the first configuration indication information indicating that CPC primary and secondary cell switching is performed in priority over LTM or CHO primary cell switching, S202e in Figure 7 is executed to perform CPC primary and secondary cell switching.

[0333] So in other words, when condition 1 is met, when the LTM target primary cell is not a CHO candidate primary cell, the primary-secondary cell switching can be performed.

[0334] It should be understood that when situation 1 is met, the CHO is in the evaluation process. If the LTM target primary cell switched in the LTM switching instruction is not a CHO candidate primary cell, the terminal device cannot perform the CHO primary cell switching, and can perform the CPC primary and secondary cell switching or the LTM primary cell switching; there is a conflict between the LTM primary cell switching and the primary and secondary cell switching. The embodiment of the present application provides different optional cell switching strategies for the terminal device when the LTM target primary cell is not a CHO candidate primary cell. As another optional method, the embodiment of the present application can perform CPC primary and secondary cell switching, thereby improving the comprehensiveness and selectivity of the switching strategy when the LTM target primary cell is not a CHO candidate primary cell, and making the cell switching when the LTM target primary cell is not a CHO candidate primary cell more flexible.

[0335] In the second scenario, the indication information is second indication information, and the second indication information is indication information when the LTM candidate primary cell is associated with the primary and secondary cells. Then the second indication information includes at least one second configuration information and at least one configuration indication information.

[0336] The second configuration information includes at least one of the following information:

[0337] (1) Configuration information of the LTM candidate primary cell; (2) Primary and secondary cells associated with the LTM candidate primary cell, as well as the configuration information of the associated primary and secondary cells and the execution conditions for CPC primary and secondary cell switching; (3) Configuration information of the CHO candidate primary cell and the execution conditions for CHO primary cell switching; (4) Primary and secondary cells associated with the CHO candidate primary cell, as well as the configuration information of the associated primary and secondary cells and the execution conditions for CPC primary and secondary cell switching.

[0338] The configuration instruction information includes at least one of the following information:

[0339] (5) First configuration indication information, the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed in priority compared to CPC primary and secondary cell switching; (6) Second configuration indication information, the second configuration indication information is used to indicate that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, or the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching; (7) Third configuration indication information, the third configuration indication information is used to indicate that the LTM candidate primary cell and the associated primary and secondary cells are switched together; (8) Waiting time for CHO evaluation.

[0340] Among them, different from the first indication information, the second indication information adds the primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, the execution conditions for CPC primary and secondary cell switching, and the third configuration indication information. Any of the two added information can instruct the terminal device to execute the cell switching strategy under the second scenario. Or if the two added information are not included in the second indication information, but the primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching are already stored locally in the terminal device, it also indicates that the cell switching under the second scenario is executed.

[0341] The following describes the two additional items:

[0342] (2) The primary and secondary cells associated with the LTM candidate primary cell are configured by the source primary cell network device. The primary and secondary cells associated with the LTM candidate primary cell may be the same as or different from the primary and secondary cells associated with the LTM candidate primary cell when the LTM candidate primary cell is a CHO candidate primary cell. In addition, the same primary and secondary cell may be associated with both the LTM candidate primary cell and the CHO candidate primary cell at the same time. This embodiment does not impose any specific limitation on this association.

[0343] The configuration information of the primary and secondary cells associated with the LTM candidate primary cell includes, but is not limited to: the cell offset of the associated primary and secondary cells, the maximum number of users of the associated primary and secondary cells, the transmission power of the associated primary and secondary cells, etc. The embodiment of the present application can adaptively add or delete the specific content in the configuration information of the CPC primary and secondary cells, so this embodiment does not specifically limit the specific content of the configuration information of the CPC primary and secondary cells. The configuration information of the CPC primary and secondary cells can provide effective information when the terminal device performs the CPC primary and secondary cell switching, thereby improving the effectiveness of the switch to the CPC primary and secondary cells.

[0344] As previously described, the CPC primary / secondary cell switching execution condition is the basis for the terminal device to evaluate the CPC primary / secondary cell; the CPC primary / secondary cell switching execution condition can be referred to as the CPC execution condition. The CPC execution condition can refer to at least one of Events A3, A4, or A5. This embodiment does not specifically limit the specific content of the execution condition.

[0345] (8) The third configuration indication information is used to instruct the LTM candidate primary cell and the associated primary and secondary cells to be switched together. The third configuration indication information can be combined with the primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions of the CPC primary and secondary cell switching to provide corresponding cell switching strategies for different situations in the second scenario.

[0346] It should be noted that the information in the second indication information that is the same as the first indication information is as described above and will not be repeated here. It should be understood that the second indication information, such as the configuration information of the LTM candidate primary cell, the primary and secondary cells associated with the LTM candidate primary cell, and the configuration information of the associated primary and secondary cells and the execution conditions of the CPC primary and secondary cell switching, the configuration information of the CHO candidate primary cell and the execution conditions of the CHO primary cell switching, the primary and secondary cells associated with the CHO candidate primary cell, and the configuration information of the associated primary and secondary cells and the execution conditions of the CPC primary and secondary cell switching, the first configuration indication information, the second configuration indication information, the third configuration indication information, the waiting time for CHO evaluation, etc., can be any form of cell switching strategy that represents the coexistence of LTM and CHO and / or CPC, when the LTM candidate primary cell is associated with the primary and secondary cells, such as numbers or fields or other forms, and this application does not limit this.

[0347] The above is an explanation of the specific content of the second indication information. In addition, as mentioned above, the transmission method of the second indication information can be carried in the radio resource control RRC reconfiguration information or dedicated signaling, which will not be repeated here.

[0348] In the second scenario, after the terminal device receives the second indication information, the coexistence of LTM and CHO and / or CPC may include any of the following situations:

[0349] Case 5: When it is evaluated that the execution conditions for CPC primary-slave cell switching are met and the CHO is in the evaluation process, it receives an LTM switching instruction sent by the source primary cell network device.

[0350] Case 6: When it is evaluated that the execution conditions of CHO primary cell switching are met and the primary and secondary cells associated with the CHO target primary cell also meet the execution conditions of CPC primary and secondary cell switching, an LTM switching instruction sent by the source primary cell network device is received.

[0351] It should be understood that the CHO target primary cell is a CHO candidate primary cell that meets the execution conditions of the CHO primary cell switching.

[0352] The cell switching performed in different situations specifically includes:

[0353] If situation 5 is satisfied, the switching of the primary cell or the switching of the primary cell and the primary and secondary cells is performed according to the second indication information.

[0354] Alternatively, if condition 6 is met, switching between the primary cell and the primary and secondary cells is performed according to the second indication information.

[0355] The following describes in detail the content of the second indication information required in each case and the corresponding switching method.

[0356] In any of the above situations 5-6, the second configuration information in the second indication information includes: configuration information of the LTM candidate primary cell; primary and secondary cells associated with the LTM candidate primary cell, configuration information of the associated primary and secondary cells, and execution conditions for CPC primary and secondary cell switching; configuration information of the CHO candidate primary cell and execution conditions for CHO primary cell switching; primary and secondary cells associated with the CHO candidate primary cell, configuration information of the associated primary and secondary cells, and execution conditions for CPC primary and secondary cell switching. Alternatively, the second configuration information includes at least one of the above items and the other items are already stored in the terminal device.

[0357] It should be understood that the difference in the configuration indication information included in the second indication information may affect the cell switching mode. Therefore, the configuration indication information included and the specific cell switching mode are described in detail.

[0358] (1) The configuration indication information of the second indication information includes at least the first configuration indication information; and may also include the waiting time for CHO evaluation, or the third configuration indication information.

[0359] Accordingly, when condition 5 is met, the cell switching method is specifically as follows:

[0360] If the LTM target primary cell switched in the LTM handover instruction is associated with the primary and secondary cells that meet the CPC primary and secondary cell handover execution conditions and includes the third configuration indication information, then S202a in Figure 7 is executed to perform LTM primary cell handover and CPC primary and secondary cell handover, and the evaluation of CHO candidate primary cells is stopped. If the LTM target primary cell switched in the LTM handover instruction is not configured with an associated primary and secondary cell, and / or the LTM target primary cell switched in the LTM handover instruction is not associated with the primary and secondary cells that meet the CPC primary and secondary cell handover execution conditions, and / or the second indication information does not include the third configuration indication information, then S202b in Figure 7 is executed based on the first configuration indication information to perform LTM primary cell handover, skip the evaluation of the current primary and secondary cells, and stop evaluating CHO candidate primary cells.

[0361] If the LTM target primary cell switched in the LTM handover instruction does not have an associated primary and secondary cell, and / or the LTM target primary cell switched in the LTM handover instruction is not associated with a primary and secondary cell that meets the CPC primary and secondary cell handover execution conditions, and / or the second indication information does not include the third configuration indication information, the LTM handover instruction is suspended and the evaluation of CHO candidate primary cells continues. When evaluating CHO candidate primary cells, the waiting CHO evaluation time is started when the CPC primary and secondary cell handover execution conditions are met. If a CHO candidate primary cell that meets the CHO primary cell handover execution conditions is found before the waiting CHO evaluation time expires, S202c in Figure 7 is executed to perform CHO primary cell handover and CPC primary and secondary cell handover.

[0362] The LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the CPC primary and secondary cell switching execution conditions and includes the third configuration indication information as the sixth condition.

[0363] The seventh condition is at least one of the following: the LTM target primary cell switched in the LTM handover instruction has no associated primary or secondary cell; the LTM target primary cell switched in the LTM handover instruction is not associated with a primary or secondary cell that meets the CPC primary or secondary cell handover execution conditions; or the second indication information does not include the third configuration indication information. The eighth condition is that the waiting time for CHO evaluation is initiated when the CPC primary or secondary cell handover execution conditions are met, and a CHO candidate primary cell that meets the CHO primary cell handover execution conditions is found before the waiting time for CHO evaluation expires.

[0364] In other words, when condition 5 is met, LTM primary cell handover and CPC primary / secondary cell handover are performed when the sixth condition is met. LTM primary cell handover is performed when the seventh condition is met. CHO primary cell handover and CPC primary / secondary cell handover are performed when both the seventh condition and the eighth condition are met.

[0365] It should be understood that the difference between Case 5 and Case 1 is that for Case 5, LTM primary cell switching and CPC primary and secondary cell switching require associated configuration, while in Case 1, LTM primary cell switching and CPC primary and secondary cell switching do not require associated configuration.

[0366] Specifically, in case 5, CHO is in the evaluation process. If the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching and includes the third configuration indication information, the terminal device cannot perform the CHO primary cell switching, so the LTM primary cell switching and the CPC primary and secondary cell switching can be performed. Under dual connection, the terminal device performs the LTM primary cell switching and the CPC primary and secondary cell switching operations, which is easy to meet the coverage requirements of the terminal device. Therefore, when the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching and includes the third configuration indication information, the LTM primary cell switching and the CPC primary and secondary cell switching can be performed preferentially. On this basis, the embodiment of the present application stops evaluating the CHO candidate primary cell, which can save the computing resources of the terminal device.

[0367] It should be understood that when the seventh condition is met, the LTM primary cell handover conflicts with the CPC primary and secondary cell handover, and the terminal device cannot determine whether to perform the LTM primary cell handover or the CPC primary and secondary cell handover. When the first indication information includes the first configuration indication information, the terminal device can determine which cell to perform the handover based on this, effectively improving the handover success rate.

[0368] It should be understood that the embodiments of the present application provide different optional primary cell switching strategies for the terminal device when the seventh condition is met. As an optional method, the evaluation of the CHO candidate primary cell can be stopped to perform the LTM primary cell switching. As another optional method, the LTM switching instruction can be suspended to continue the evaluation of the CHO candidate primary cell, so as to perform the CHO primary cell switching and the CPC primary and secondary cell switching when the seventh condition and the eighth condition are met. Therefore, the comprehensiveness and selectivity of the cell switching strategy when the seventh condition is met are improved, and the cell switching when the seventh condition is met is made more flexible.

[0369] (2) Configuration indication information of the second indication information includes: second configuration indication information. The second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover.

[0370] When condition 6 is met, the cell switching method is as follows:

[0371] If the LTM target primary cell switched in the LTM switching instruction is the same as the primary cell that meets the execution conditions of the CHO primary cell switching, or the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, then S202a in Figure 7 is executed based on the second configuration indication information to perform LTM primary cell switching and CPC primary and secondary cell switching.

[0372] If the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is not configured with associated primary and secondary cells, or the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, then execute S202c in Figure 7 to perform CHO primary cell switching and CPC primary and secondary cell switching.

[0373] The ninth condition is any one of the following:

[0374] The LTM target primary cell switched in the LTM switching instruction is the same as the primary cell that meets the execution conditions of the CHO primary cell switching.

[0375] The LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching, and the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching.

[0376] The tenth condition is any one of the following:

[0377] The LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching, and the LTM target primary cell switched in the LTM switching instruction has no associated primary and secondary cells configured.

[0378] The LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching, and the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching.

[0379] In other words, when the ninth condition is met, LTM primary cell switching and CPC primary and secondary cell switching are performed, and when the tenth condition is met, CHO primary cell switching and CPC primary and secondary cell switching are performed.

[0380] It should be understood that when the ninth condition is met, for the two cell switching strategies of LTM primary cell switching and CPC primary and secondary cell switching and CHO primary cell switching and CPC primary and secondary cell switching, the two primary cell switching methods of LTM primary cell switching and CHO primary cell switching conflict, then the terminal device cannot determine whether to execute LTM primary cell switching and CPC primary and secondary cell switching, or to execute CHO primary cell switching and CPC primary and secondary cell switching. When the second indication information includes the second configuration indication information, the terminal device can determine which primary cell switching method to use for the switching of the primary cell based on this, that is, when the second configuration indication information indicates that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, it is determined to execute LTM primary cell switching and CPC primary and secondary cell switching. Therefore, the second configuration indication information can enable the terminal device to determine which primary cell switching method and CPC primary and secondary cell switching to execute when the ninth condition is met, thereby effectively improving the switching success rate of the cell.

[0381] (3) Configuration indication information of the second indication information includes: second configuration indication information. The second configuration indication information is used to indicate that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover.

[0382] When condition 6 is met, the cell switching method is as follows:

[0383] If the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, then S202c in Figure 7 is executed based on the second configuration indication information to perform the CHO primary cell switching and the CPC primary and secondary cell switching.

[0384] It should be understood that, in the case where the LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching and the LTM target primary cell switched in the LTM switching instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching, when the second configuration indication information indicates that the priority of the CHO primary cell switching is higher than the priority of the LTM primary cell switching, it is determined to execute the CHO primary cell switching and the CPC primary and secondary cell switching. Therefore, the second configuration indication information can enable the terminal device to determine which primary cell switching mode and CPC primary and secondary cell switching to execute when the ninth condition is met, thereby effectively improving the cell switching success rate.

[0385] It should be noted that for other situations in the second scenario, such as when an LTM switching instruction is received from the source main cell network device when it is evaluated that the execution conditions for CHO main cell switching are met, this embodiment can execute S202d in Figure 7 according to the above-mentioned second configuration indication information to perform CHO main cell switching.

[0386] It should be understood that when the second configuration indication information indicates that the priority of CHO primary cell switching is higher than the priority of LTM primary cell switching, CHO primary cell switching is performed; or when the second configuration indication information indicates that the priority of LTM primary cell switching is higher than the priority of CHO primary cell switching, S202b in Figure 7 is executed to perform LTM primary cell switching.

[0387] That is to say, different second configuration indication information can provide corresponding primary cell switching strategies for the terminal device, thereby improving the comprehensiveness and selectivity of the primary cell switching strategies and making the primary cell switching more flexible.

[0388] It should be noted that the first configuration indication information may also indicate that CPC primary and secondary cell switching is performed preferentially over LTM or CHO primary cell switching.

[0389] Therefore, as another implementation method, if situation 5 is met, it may further include: executing switching of the primary and secondary cells according to the second indication information.

[0390] (4) The configuration indication information of the second indication information includes at least the first configuration indication information and may also include the waiting time for CHO evaluation.

[0391] Accordingly, when condition 5 is met, the cell switching method is specifically as follows:

[0392] If the LTM target primary cell switched in the LTM switching instruction is not configured with an associated primary and secondary cell, and / or the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cell that meets the execution conditions of the CPC primary and secondary cell switching, and / or the second indication information does not include the third configuration indication information, then based on the first configuration indication information indicating that the CPC primary and secondary cell switching is performed in priority compared to the LTM or CHO primary cell switching, S202e in Figure 7 is executed, the CPC primary and secondary cell switching is performed, and the evaluation of the current primary cell is skipped.

[0393] If the LTM target primary cell switched in the LTM handover instruction does not have an associated primary and secondary cell, and / or the LTM target primary cell switched in the LTM handover instruction is not associated with a primary and secondary cell that meets the CPC primary and secondary cell handover execution conditions, and / or the second indication information does not include the third configuration indication information, then the evaluation of the CHO candidate primary cell continues. When evaluating the CHO candidate primary cells, the waiting CHO evaluation time is started when the CPC primary and secondary cell handover execution conditions are met. If a CHO candidate primary cell that meets the CHO primary cell handover execution conditions is found before the waiting CHO evaluation time expires, then S202c in Figure 7 is executed to perform the CHO primary cell handover and the CPC primary and secondary cell handover.

[0394] It should be understood that when condition 5 is met and the CHO is in the evaluation process, if the LTM target primary cell to be switched in the LTM handover instruction does not have an associated primary and secondary cell configured, and / or the LTM target primary cell to be switched in the LTM handover instruction is not associated with a primary and secondary cell that meets the execution conditions for CPC primary and secondary cell handover, and / or the second indication information does not include the third configuration indication information, then the terminal device cannot perform a CHO primary cell handover and can perform a CPC primary and secondary cell handover or an LTM primary cell handover; a conflict exists between primary and primary and secondary cell handovers. In this case, embodiments of the present application can provide different optional cell handover strategies for the terminal device. As another alternative, embodiments of the present application can perform a CPC primary and secondary cell handover, thereby improving the comprehensiveness and selectivity of the handover strategy in this case and making cell handover more flexible. As another alternative, further evaluation of candidate CHO primary cells can be performed to execute a CHO primary cell handover and a CPC primary and secondary cell handover when both the seventh and eighth conditions are met. This improves the comprehensiveness and selectivity of the cell handover strategy when the seventh condition is met and makes cell handover more flexible when the seventh condition is met.

[0395] The following describes the cell switching solutions in the first and second scenarios by means of interaction between the terminal device and the network device.

[0396] In the first scenario, as shown in FIG8 , the cell handover method includes the following steps:

[0397] S81, the terminal device determines that it is in the RRC connection state.

[0398] It should be understood that the terminal device currently in the RRC connection state has established a connection with the source primary cell network device and has established a connection with the source primary and secondary cell network devices.

[0399] It should also be understood that the specific forms of the source primary cell network equipment, the source primary and secondary cell network equipment and the terminal equipment can refer to the above-mentioned relevant descriptions and will not be repeated here.

[0400] S82, the terminal device reports the measurement results to the source primary cell network device.

[0401] The measurement results may include: measurement results of the source primary cell, measurement results of the source primary and secondary cells, measurement results of neighboring cells of the source primary cell, or measurement results of neighboring cells of the source primary and secondary cells. Neighboring cells of the source primary cell may be target primary cells and potential target primary cells. Neighboring cells of the source primary cell may be target primary and secondary cells and potential target primary and secondary cells. The embodiments of the present application do not specifically limit the specific information type in the reporting results.

[0402] S83, the source primary cell network device obtains the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell switching, the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for the CPC primary and secondary cell switching, and the configuration information of the LTM candidate primary cell.

[0403] It should be understood that the configuration information of the CHO candidate primary cell and the execution conditions for the CHO primary cell switching, the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for the CPC primary and secondary cell switching, and the specific description of the configuration information of the LTM candidate primary cell shall all refer to the above-mentioned relevant instructions and shall not be repeated here.

[0404] It should also be understood that after obtaining this information, the source primary cell network device determines to send the first indication information and execute S84 when the LTM candidate primary cell is not associated with the primary and secondary cells. The specific content of the first indication information and the situations encountered can be referred to the above related description and will not be repeated here.

[0405] S84, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0406] It should be understood that the RRC reconfiguration information carries the first indication information. S84 obtains, through the RRC reconfiguration information, the configuration information of the candidate primary cell for CHO and the execution conditions for switching the primary cell for CHO, and / or the configuration information of the candidate primary and secondary cells and the execution conditions for switching the primary and secondary cells for CPC, and obtains the first indication information through the RRC reconfiguration information, thereby effectively avoiding waste of communication resources.

[0407] S85, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device.

[0408] S86, the terminal device performs CHO and CPC evaluation.

[0409] Among them, S86 is used to evaluate whether there is a CHO candidate primary cell that meets the execution conditions of CHO primary cell switching, and whether there is a primary and secondary cell that meets the execution conditions of CPC primary and secondary cell switching.

[0410] It should be understood that the evaluation result includes at least one of the following: (1) there is a primary and secondary cell that meets the execution conditions for CPC primary and secondary cell switching and the CHO is being evaluated; (2) there is a CHO candidate primary cell that meets the execution conditions for CHO primary cell switching; (3) there is a CHO candidate primary cell that meets the execution conditions for CHO primary cell switching and there is a primary and secondary cell that meets the execution conditions for CPC primary and secondary cell switching.

[0411] S87, the source primary cell network device sends an LTM switching instruction to the terminal device.

[0412] It should be understood that the source primary cell network device sends the LTM switching instruction to the terminal device, which can provide another primary cell switching method other than the CHO primary cell switching method for the primary cell switching, thereby improving the comprehensiveness and selectivity of the primary cell switching strategy.

[0413] S88, the terminal device determines the cell to be switched and the corresponding execution method.

[0414] It should be understood that since the cells to be switched include: main cell, main and auxiliary cell, or main cell and main and auxiliary cell; the execution modes corresponding to the main cell are LTM or CHO; the execution modes corresponding to the main and auxiliary cell are CPC; the execution modes corresponding to the main cell and main and auxiliary cell are: LTM and CPC, or CHO and CPC.

[0415] S89, the terminal device executes the random access process.

[0416] It should be understood that the corresponding random access procedure is executed based on the cell to be handed over and the corresponding execution method determined in S88. The description of the random access procedure can refer to the relevant technology. S89a1 and S89a2 in Figure 8 correspond to S202a in Figure 7, S89b in Figure 8 corresponds to S202b in Figure 7, S89c1 and S89c2 in Figure 8 correspond to S202c in Figure 7, S89d in Figure 8 corresponds to S202d in Figure 7, and S89e in Figure 8 corresponds to S202e in Figure 7.

[0417] Optionally, the method may further include the following steps:

[0418] S90: The terminal device starts waiting for the CHO evaluation time.

[0419] It should be understood that if the first indication information includes a CHO evaluation waiting time, then upon receiving the LTM switching instruction, the CHO evaluation waiting time may be activated to extend the CHO evaluation time. If the CHO evaluation waiting time is pre-stored on the terminal device, then even if the first indication information does not include a CHO evaluation waiting time, the terminal device may also activate the CHO evaluation waiting time to extend the CHO evaluation time.

[0420] It should be noted that the specific solution of cell switching performed in this embodiment is similar to the specific solution of cell switching performed in the above-mentioned cases 1, 2 and 3, and will not be repeated here.

[0421] In the second scenario, as shown in FIG9 , the cell switching method includes the following steps:

[0422] S91, the terminal device determines that it is in the RRC connection state.

[0423] It should be understood that the terminal device currently in the RRC connection state has established a connection with the source primary cell network device and has established a connection with the source primary and secondary cell network devices.

[0424] It should also be understood that the specific forms of the source primary cell network equipment, the source primary and secondary cell network equipment and the terminal equipment can refer to the above-mentioned relevant descriptions and will not be repeated here.

[0425] S92, the terminal device reports the measurement results to the source primary cell network device.

[0426] The measurement results may include: measurement results of the source primary cell, measurement results of the source primary and secondary cells, measurement results of neighboring cells of the source primary cell, or measurement results of neighboring cells of the source primary and secondary cells. Neighboring cells of the source primary cell may be target primary cells and potential target primary cells. Neighboring cells of the source primary cell may be target primary and secondary cells and potential target primary and secondary cells. The embodiments of the present application do not specifically limit the specific information type in the reporting results.

[0427] S93, the source primary cell network device obtains the configuration information of the CHO candidate primary cell and the execution conditions of the CHO primary cell switching, the configuration information of the candidate primary and secondary cells and the execution conditions of the CPC primary and secondary cell switching, and the configuration information of the LTM candidate primary cell.

[0428] It should be understood that the candidate primary and secondary cells are the primary and secondary cells associated with the CHO candidate primary cell and / or the primary and secondary cells associated with the LTM candidate primary cell. The configuration information of the CHO candidate primary cell and the execution conditions for CHO primary cell switching, the configuration information of the primary and secondary cells associated with the CHO candidate primary cell and the execution conditions for CPC primary and secondary cell switching, the configuration information of the primary and secondary cells associated with the LTM candidate primary cell and the execution conditions for CPC primary and secondary cell switching, and the specific description of the configuration information of the LTM candidate primary cell are all referred to the above-mentioned relevant descriptions and are not repeated here.

[0429] It should also be understood that after obtaining this information, the source primary cell network device determines to send the second indication information when the LTM candidate primary cell is associated with the primary and secondary cells, and executes S94. The specific content of the second indication information and its applicable circumstances can be referred to the above related descriptions and will not be repeated here.

[0430] S94, the source primary cell network device sends RRC reconfiguration information to the terminal device.

[0431] It should be understood that the RRC reconfiguration information carries the second indication information. S94 obtains, through the RRC reconfiguration information, the configuration information of the candidate primary cell and the execution conditions for the CHO primary cell handover and / or the configuration information of the candidate primary and secondary cells and the execution conditions for the CPC primary and secondary cell handover, thereby effectively avoiding waste of communication resources.

[0432] S95, the terminal device sends an RRC reconfiguration completion message to the source primary cell network device.

[0433] S96, the terminal device performs CHO and CPC evaluation.

[0434] S96 is used to evaluate whether there is a CHO candidate primary cell that meets the execution conditions of CHO primary cell switching, and whether there is a primary and secondary cell that meets the execution conditions of CPC primary and secondary cell switching.

[0435] It should be understood that the evaluation result includes at least one of the following: (1) there is a primary and secondary cell that meets the execution conditions for CPC primary and secondary cell switching and the CHO is being evaluated; (2) there is a CHO candidate primary cell that meets the execution conditions for CHO primary cell switching; (3) there is a CHO candidate primary cell that meets the execution conditions for CHO primary cell switching and there is a primary and secondary cell that meets the execution conditions for CPC primary and secondary cell switching.

[0436] S97, the source primary cell network device sends an LTM switching instruction to the terminal device.

[0437] It should be understood that the source primary cell network device sends the LTM switching instruction to the terminal device, which can provide another primary cell switching method other than the CHO primary cell switching method for the primary cell switching, thereby improving the comprehensiveness and selectivity of the primary cell switching strategy.

[0438] S98, the terminal device determines the cell to be switched and the corresponding execution method.

[0439] It should be understood that since the cells to be switched include: main cell, main and auxiliary cell, or main cell and main and auxiliary cell; the execution modes corresponding to the main cell are LTM or CHO; the execution modes corresponding to the main and auxiliary cell are CPC; the execution modes corresponding to the main cell and main and auxiliary cell are: LTM and CPC, or CHO and CPC.

[0440] S99: The terminal device executes a random access procedure.

[0441] It should be understood that the corresponding random access procedure is executed based on the cell to be handed over and the corresponding execution method determined in S98. The description of the random access procedure can refer to the relevant technology. S99a1 and S99a2 in Figure 9 correspond to S202a in Figure 7, S99b in Figure 9 corresponds to S202b in Figure 7, S99c1 and S99c2 in Figure 9 correspond to S202c in Figure 7, S99d in Figure 9 corresponds to S202d in Figure 7, and S99e in Figure 8 corresponds to S202e in Figure 7.

[0442] Optionally, the method may further include the following steps:

[0443] S100: The terminal device starts waiting for the CHO evaluation time.

[0444] It should be understood that if the second indication information includes a CHO evaluation wait time, then upon receiving the LTM switching instruction, the CHO evaluation wait time may be activated to extend the CHO evaluation time. If the CHO evaluation wait time is pre-stored on the terminal device, then even if the second indication information does not include a CHO evaluation wait time, the terminal device may also activate the CHO evaluation wait time to extend the CHO evaluation time.

[0445] It should be noted that the specific solution of cell switching performed in this embodiment is similar to the specific solution of cell switching performed in the above-mentioned cases 5 and 6, and will not be repeated here.

[0446] The method provided by the embodiment of the present application is described in detail above with reference to Figures 7 to 9. The device provided by the embodiment of the present application is described in detail below with reference to Figure 10.

[0447] FIG10 is a schematic block diagram of a cell switching apparatus 10 according to an embodiment of the present application. As shown in FIG10 , the cell switching apparatus 10 may include a processing unit 11 and a transceiver unit 12 .

[0448] In one possible design, the cell switching device 10 can implement operations corresponding to the terminal device in the above method embodiment. For example, the cell switching device can be a terminal device, or a component configured in the terminal device, such as a chip or circuit.

[0449] The cell switching apparatus 10 can implement the corresponding operations of the terminal device in the method embodiments shown in Figures 7 to 9. For example, the transceiver unit 12 can be used to execute S201 in method 200, and the processing unit 11 can be used to execute S202 in method 200. Furthermore, the various units in the cell switching apparatus 10 and the other operations and / or functions described above are respectively used to implement the corresponding processes in the method embodiment shown in Figure 7.

[0450] Specifically, when the cell switching apparatus 10 is used to execute the method 200 in FIG. 7 , the transceiver unit 12 may be configured to receive indication information sent by a source primary cell network device, the indication information being configured to indicate a cell switching strategy under the coexistence of Layer 1 / 2 triggered mobility LTM and conditional handover (CHO) and / or conditional primary / secondary cell change (CPC). The processing unit 11 may be configured to, upon determining to execute a cell handover, execute the cell handover according to the indication information. The source primary cell network device is the network device to which the source primary cell belongs.

[0451] In another possible design, the cell switching device 10 can implement the operations corresponding to the source primary cell network device in the above method embodiment. For example, the cell switching device can be the source primary cell network device, or a component configured in the source primary cell network device, such as a chip or circuit.

[0452] The cell switching apparatus 10 can implement the corresponding operations of the source primary cell network device in the method embodiment shown in FIG7 . For example, the transceiver unit 12 can be used to execute S201 in method 200 . Furthermore, the various units in the cell switching apparatus 10 and the other operations and / or functions described above are respectively configured to implement the corresponding processes in the method embodiment shown in FIG7 .

[0453] Specifically, when the cell switching device 10 is used to execute the method 200 in Figure 7, the transceiver unit 12 can be used to send indication information to the terminal device, where the indication information is used to indicate the cell switching strategy under the coexistence of the mobility LTM triggered by the 1st / 2nd layer and the conditional handover CHO and / or the conditional primary and secondary cell change CPC. It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0454] It should also be understood that the division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0455] It should be understood that the cell switching device 10 may correspond to the terminal device 130 or the network device 110 in the communication system 100 shown in Figure 1. The terminal device 130 may be an example of a terminal device, and the network device 110 may be an example of a source primary cell network device. Among them, the processing unit 11 in the cell switching device 10 may correspond to the processor in the terminal device 130 or the network device 110, and the instructions stored in the memory may be called by the processor in the terminal device 130 or the network device 110 to implement the above functions, such as network coding, obtaining original packets, etc.; the transceiver unit 12 may correspond to the interface in the terminal device 130 or the network device 110, and may respond to the instructions of the processor to implement the above functions of receiving and / or sending data.

[0456] Specifically, the transceiver unit 12 in the cell switching device 10 can be implemented by a transceiver or a communication interface, for example, it can correspond to the transceiver 3020 in the terminal device 3000 shown in Figure 11 and the RRU 4020 in the source primary cell network device shown in Figure 12. The processing unit 11 in the cell switching device 10 can be implemented by at least one processor, for example, it can correspond to the processor 3010 in the terminal device 3000 shown in Figure 11 and the processor 4060 in the source primary cell network device shown in Figure 12.

[0457] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0458] Figure 11 is a schematic diagram of a possible structure of a terminal device 3000 provided in an embodiment of the present application. The terminal device 3000 can be applied to the system shown in Figure 1 to perform the functions of the terminal device in the above method embodiment. As shown in Figure 11, the terminal device 3000 includes a processor 3010 and a transceiver 3020. Optionally, the terminal device 3000 also includes a memory 3030. The processor 3010, the transceiver 3020, and the memory 3030 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 3030 is used to store a computer program, and the processor 3010 is used to call and run the computer program from the memory 3030 to control the transceiver 3020 to send and receive signals. Optionally, the terminal device 3000 may also include an antenna 3040 for transmitting the uplink data or uplink control signaling output by the transceiver 3020 via a wireless signal.

[0459] The processor 3010 and the memory 3030 may be combined to form a cell switching device, and the processor 3010 is configured to execute the program code stored in the memory 3030 to implement the above functions. In a specific implementation, the memory 3030 may also be integrated into the processor 3010 or independent of the processor 3010. The processor 3010 may correspond to the processing unit 11 in FIG. 10 .

[0460] The transceiver 3020 may correspond to the transceiver unit 12 in FIG10 . The transceiver 3020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0461] It should be understood that the terminal device 3000 shown in FIG11 is capable of implementing the various processes involved in the terminal device in the method embodiments shown in FIG7 through FIG9 . The operations and / or functions of the various modules in the terminal device 3000 are respectively for implementing the corresponding processes in the above method embodiments. For details, please refer to the description of the above method embodiments; to avoid repetition, detailed descriptions are omitted here.

[0462] The processor 3010 can be used to execute the actions implemented within the terminal device described in the previous method embodiments, and the transceiver 3020 can be used to execute the actions described in the previous method embodiments where the terminal device sends or receives data to or from the source primary cell network device. For details, please refer to the description in the previous method embodiments and will not be repeated here.

[0463] Optionally, the terminal device 3000 may further include a power supply 3050 for providing power to various devices or circuits in the terminal device.

[0464] In addition, in order to make the functions of the terminal device more complete, the terminal device 3000 can also include one or more of an input unit 3060, a display unit 3070, an audio circuit 3080, a camera 3090 and a sensor 3100, and the audio circuit can also include a speaker 3110, a microphone 3120, etc.

[0465] Figure 12 is a possible structural diagram of a source primary cell network device provided in an embodiment of the present application, for example, a structural diagram of a base station 4000. The base station 4000 can be applied to the system shown in Figure 1 to perform the functions of the source primary cell network device in the above method embodiment. As shown in Figure 12, the base station 4000 may include one or more radio frequency units, such as a remote radio unit (RRU) 4020 and one or more baseband units (BBU) (also referred to as distributed units (DU)) 4010. The RRU 4020 may be referred to as a transceiver unit, corresponding to the transceiver unit 12 in Figure 10. Optionally, the transceiver unit may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 4030 and a radio frequency unit 4040. Optionally, the transceiver unit may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or a receiver, a receiving circuit), and the transmitting unit may correspond to a transmitter (or a transmitter, a transmitting circuit). The RRU 4020 is primarily responsible for transmitting and receiving RF signals and converting them into baseband signals, for example, for sending instructions to terminal devices. The BBU 4010 is primarily responsible for baseband processing and base station control. The RRU 4020 and BBU 4010 can be physically located together or separately, forming a distributed base station.

[0466] BBU 4010 is the control center of the base station, also known as a processing unit, which may correspond to processing unit 11 in Figure 10 and is primarily responsible for performing baseband processing functions such as channel coding, multiplexing, modulation, and spread spectrum. For example, the BBU (processing unit) may be used to control the base station to execute the network device operation procedures in the above-mentioned method embodiments, such as generating the above-mentioned indication information.

[0467] In one example, the BBU 4010 can be composed of one or more single boards, and the multiple single boards can jointly support a wireless access network with a single access standard (such as an LTE network), or can separately support wireless access networks with different access standards (such as an LTE network, a 5G network, or other networks). The BBU 4010 also includes a memory 4050 and a processor 4060. The memory 4050 is used to store necessary instructions and data. The processor 4060 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 4050 and the processor 4060 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards can share the same memory and processor. In addition, necessary circuits can also be set on each single board.

[0468] It should be understood that base station 4000 shown in Figure 12 is capable of implementing the various processes involving the source primary cell network device in the method embodiment shown in Figure 7. The operations and / or functions of the various modules in base station 4000 are respectively for implementing the corresponding processes in the above method embodiment. For details, please refer to the description of the above method embodiment. To avoid repetition, detailed description is omitted here.

[0469] The BBU 4010 can be used to perform the actions implemented within the network device described in the previous method embodiments, while the RRU 4020 can be used to perform the actions described in the previous method embodiments in which the network device sends to or receives from the terminal device. For details, please refer to the description in the previous method embodiments and will not be repeated here.

[0470] It should be understood that the base station 4000 shown in Figure 12 is only one possible architecture of the source primary cell network device and should not constitute any limitation to this application. The method provided in this application is applicable to network devices of other architectures. For example, network devices including CU, DU and active antenna unit (AAU). This application does not limit the specific architecture of the source primary cell network device.

[0471] An embodiment of the present application further provides a cell switching device, including a processor and an interface; the processor is configured to execute the method in any of the above method embodiments.

[0472] It should be understood that the cell switching device may be one or more chips. For example, the cell switching device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0473] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0474] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-mentioned method embodiment can be completed by hardware integrated logic circuits in the processor or by software instructions. The above-mentioned processor can be a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above-mentioned method.

[0475] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0476] According to the method provided in the embodiments of the present application, the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the computer executes the method of any one of the embodiments shown in Figures 7 to 9.

[0477] According to the method provided in the embodiments of the present application, the present application also provides a chip system, including at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by lines, and the at least one processor is used to run a computer program or instruction so that the computer executes the method of any one of the embodiments shown in Figures 7 to 9.

[0478] According to the method provided in the embodiments of the present application, the present application also provides a computer program product, including a computer program, which, when run, enables the computer to execute the method of any one of the embodiments shown in Figures 7 to 9.

[0479] The source primary cell network device in each of the above-mentioned apparatus embodiments fully corresponds to the source primary cell network device or terminal device in the terminal device and method embodiments, and the corresponding steps are performed by the corresponding modules or units. For example, the communication unit (transceiver) performs the receiving or sending steps in the method embodiment, and other steps except sending and receiving can be performed by the processing unit (processor). The functions of the specific units can refer to the corresponding method embodiments. Among them, there can be one or more processors.

[0480] As used in this specification, the terms "component," "module," "system," and the like are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside in a process and / or an execution thread, and a component can be located on a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component on a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0481] Those skilled in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0482] Those skilled in the art will 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.

[0483] In the several embodiments provided in this 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 merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as 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 through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0484] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0485] 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.

[0486] In the above embodiments, the functions of each functional unit can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (program) are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. Available media may be magnetic media (eg, floppy disks, hard disks, tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state disks (SSDs)).

[0487] If the function 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 technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments 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 ROM, a RAM, a magnetic disk, or an optical disk.

[0488] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A cell handover method, characterized in that: include: Receive indication information sent by the source primary cell network device, where the indication information is used to indicate a cell handover strategy under the coexistence of mobility LTM triggered at layer 1 / 2 and conditional handover CHO and / or conditional primary and secondary cell change CPC; The cell switching is performed according to the indication information.

2. The method according to claim 1, characterized in that The performing cell switching according to the indication information includes: If at least one of CPC and CHO meets the execution condition and receives the LTM switching instruction sent by the source primary cell network device, the switching of the primary cell or the switching of the primary cell and the primary and secondary cells is executed according to the instruction information.

3. The method according to claim 2, characterized in that The indication information is the first indication information or the second indication information; The first indication information is the indication information when the LTM candidate primary cell is not associated with the primary and secondary cells, and the second indication information is the indication information when the LTM candidate primary cell is associated with the primary and secondary cells.

4. The method according to claim 3, characterized in that The first indication information includes at least one item of first configuration information and at least one item of configuration indication information; The first configuration information includes at least one of the following information: Configuration information of LTM candidate primary cells; Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell; The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; The configuration instruction information includes at least one of the following information: First configuration indication information, where the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary / secondary cell switching; Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover; Waiting time for CHO evaluation.

5. The method according to claim 4, characterized in that If at least one of CPC and CHO meets the execution condition and receives the LTM switching instruction sent by the source primary cell network device, performing the switching of the primary cell or performing the switching of the primary cell and the primary and secondary cells according to the instruction information, including: If the execution conditions for CPC primary and secondary cell switching are met and the CHO receives an LTM switching instruction sent by the source primary cell network device during the evaluation process, the CHO performs switching of the primary cell or performs switching of the primary cell and the primary and secondary cells according to the first indication information; Alternatively, if an LTM switching instruction sent by the source primary cell network device is received when the execution condition of the CHO primary cell switching is met, the primary cell switching is performed according to the first indication information; Alternatively, if the execution conditions for CHO primary cell switching and CPC primary and secondary cell switching are met and an LTM switching instruction is received from the source primary cell network device, the CHO primary cell switching and CPC primary and secondary cell switching are performed according to the first indication information.

6. The method according to claim 5, characterized in that The performing handover of the primary cell or the handover of the primary cell and the primary and secondary cells according to the first indication information includes: Performing LTM primary cell switching and CPC primary and secondary cell switching when a first condition is met, wherein the first condition is that the LTM target primary cell switched in the LTM switching instruction is a CHO candidate primary cell; Alternatively, performing LTM primary cell handover when a second condition is met, wherein the second condition is: the LTM target primary cell is not a CHO candidate primary cell; Alternatively, CHO primary cell switching and CPC primary and secondary cell switching are performed when the second condition and the third condition are met, and the third condition is: when the execution condition of CPC primary and secondary cell switching is met, the waiting time for CHO evaluation is started, and before the waiting time for CHO evaluation times out, there is a CHO candidate primary cell that meets the execution condition of CHO primary cell switching.

7. The method according to claim 6, characterized in that When the first condition is met, the method further includes: Stop evaluating CHO candidate primary cells.

8. The method according to claim 6, characterized in that Before the second condition is satisfied and determining whether the third condition is satisfied, the method further includes: Suspend the LTM handover command and continue to evaluate the CHO candidate primary cells.

9. The method according to claim 5, characterized in that The performing switching of the primary cell according to the first indication information includes: Performing LTM primary cell handover when a fourth condition is met, wherein the fourth condition is: the second configuration indication information indicates that the priority of LTM primary cell handover is higher than the priority of CHO primary cell handover; The CHO primary cell switching is performed when a fifth condition is met, and the fifth condition is: the second configuration indication information indicates that the priority of the CHO primary cell switching is higher than the priority of the LTM primary cell switching.

10. The method according to claim 3, characterized in that The second indication information includes at least one item of second configuration information and at least one item of configuration indication information; The second configuration information includes at least one of the following information: Configuration information of LTM candidate primary cells; The primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell; The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; The configuration instruction information includes at least one of the following information: First configuration indication information, where the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary / secondary cell switching; Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover; Third configuration indication information, where the third configuration indication information is used to instruct the LTM candidate primary cell and the associated primary and secondary cells to be switched together; Waiting time for CHO evaluation.

11. The method according to claim 10, characterized in that If at least one of CPC and CHO meets the execution condition and receives the LTM switching instruction sent by the source primary cell network device, performing the switching of the primary cell or performing the switching of the primary cell and the primary and secondary cells according to the instruction information, including: If the execution conditions for CPC primary-secondary cell switching are met and the CHO receives an LTM switching instruction sent by the source primary cell network device during the evaluation process, the CHO performs switching of the primary cell or performs switching of the primary cell and the primary-secondary cell according to the second indication information; or, If the execution conditions for CHO primary cell switching are met and the primary and secondary cells associated with the CHO target primary cell also meet the execution conditions for CPC primary and secondary cell switching, and an LTM switching instruction is received from the source primary cell network device, the switching of the primary cell and the primary and secondary cells is performed according to the second indication information.

12. The method according to claim 11, characterized in that The performing handover of the primary cell or the handover of the primary cell and the primary and secondary cells according to the second indication information includes: Performing LTM primary cell handover and CPC primary and secondary cell handover when a sixth condition is met, wherein the sixth condition is that the LTM target primary cell switched in the LTM handover instruction is associated with the primary and secondary cells that meet the execution condition of the CPC primary and secondary cell handover and includes third configuration indication information; The LTM primary cell switching is performed when the seventh condition is met, wherein the seventh condition is at least one of the following: The LTM target primary cell to be switched in the LTM switching command has no associated primary or secondary cells configured; The LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of CPC primary and secondary cell switching; The second indication information does not include third configuration indication information; When the seventh condition and the eighth condition are met, CHO primary cell switching and CPC primary and secondary cell switching are performed. The eighth condition is: when the execution condition of CPC primary and secondary cell switching is met, the waiting time for CHO evaluation is started, and before the waiting time for CHO evaluation times out, there is a CHO candidate primary cell that meets the execution condition of CHO primary cell switching.

13. The method according to claim 12, characterized in that When the sixth condition is met, the method further includes: Stop evaluating CHO candidate primary cells.

14. The method according to claim 12, characterized in that When the seventh condition is met, the method further includes: Skip the evaluation of the current primary and secondary cells and stop evaluating the CHO candidate primary cells.

15. The method according to claim 12, characterized in that Before the seventh condition is satisfied and determining whether the eighth condition is satisfied, the method further includes: Suspend the LTM handover command and continue to evaluate the CHO candidate primary cells.

16. The method according to claim 11, characterized in that The performing switching of the primary cell and the primary and secondary cells according to the second indication information includes: When the ninth condition is met, the LTM primary cell switching and the CPC primary and secondary cell switching are performed, and the ninth condition is any one of the following: The LTM target primary cell switched in the LTM switching instruction is the same as the primary cell that meets the execution conditions for CHO primary cell switching; The LTM target primary cell switched in the LTM handover instruction is different from the primary cell that meets the execution conditions of the CHO primary cell handover, and the LTM target primary cell switched in the LTM handover instruction is associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell handover; The CHO primary cell switching and the CPC primary and secondary cell switching are performed when the tenth condition is met, and the tenth condition is any one of the following: The LTM target primary cell switched in the LTM handover instruction is different from the primary cell that meets the execution conditions of the CHO primary cell handover, and the LTM target primary cell switched in the LTM handover instruction has no associated primary and secondary cells configured; The LTM target primary cell switched in the LTM switching instruction is different from the primary cell that meets the execution conditions of the CHO primary cell switching, and the LTM target primary cell switched in the LTM switching instruction is not associated with the primary and secondary cells that meet the execution conditions of the CPC primary and secondary cell switching.

17. The method according to any one of claims 1 to 16, characterized in that The indication information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

18. A cell switching method, characterized in that: include: Send indication information to the terminal device, where the indication information is used to indicate the cell switching strategy under the coexistence of mobility LTM triggered at layer 1 / 2 and conditional switching CHO and / or conditional primary and secondary cell change CPC.

19. The method according to claim 18, characterized in that Also includes: An LTM switching instruction is sent to the terminal device, where the LTM switching instruction is sent when the terminal device evaluates that at least one of CPC and CHO meets an execution condition.

20. The method according to claim 19, characterized in that The indication information is the first indication information or the second indication information; The first indication information is the indication information when the LTM candidate primary cell is not associated with the primary and secondary cells, and the second indication information is the indication information when the LTM candidate primary cell is associated with the primary and secondary cells.

21. The method according to claim 20, characterized in that The first indication information includes at least one item of first configuration information and at least one item of configuration indication information; The first configuration information includes at least one of the following information: Configuration information of LTM candidate primary cells; Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell; The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; The configuration instruction information includes at least one of the following information: First configuration indication information, where the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary / secondary cell switching; Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover; Waiting time for CHO evaluation.

22. The method according to claim 20, characterized in that The second indication information includes at least one item of second configuration information and at least one item of configuration indication information; The second configuration information includes at least one of the following information: Configuration information of LTM candidate primary cells; The primary and secondary cells associated with the LTM candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; Configuration information of candidate primary cells of the CHO and execution conditions of switching of the CHO primary cell; The primary and secondary cells associated with the CHO candidate primary cell, the configuration information of the associated primary and secondary cells, and the execution conditions for CPC primary and secondary cell switching; The configuration instruction information includes at least one of the following information: First configuration indication information, where the first configuration indication information is used to indicate that LTM or CHO primary cell switching is performed preferentially over CPC primary / secondary cell switching; Second configuration indication information, where the second configuration indication information is used to indicate that the priority of the LTM primary cell handover is higher than the priority of the CHO primary cell handover, or that the priority of the CHO primary cell handover is higher than the priority of the LTM primary cell handover; Third configuration indication information, where the third configuration indication information is used to instruct the LTM candidate primary cell and the associated primary and secondary cells to be switched together; Waiting time for CHO evaluation.

23. The method according to any one of claims 18 to 22, characterized in that The indication information is carried in radio resource control RRC reconfiguration information or dedicated signaling.

24. A terminal device, characterized in that: include: processors, memory, and transceivers; The memory stores computer-executable instructions; the transceiver is used to transmit and receive data; The processor executes the computer-executable instructions stored in the memory, so that the terminal device performs the method according to any one of claims 1 to 17.

25. A source primary cell network device, characterized in that: include: processors, memory, and transceivers; The memory stores computer-executable instructions; the transceiver is used to transmit and receive data; The processor executes the computer-executable instructions stored in the memory, so that the terminal device performs the method according to any one of claims 18 to 23.

26. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 23 is implemented.

27. A chip system, characterized in that: The system comprises at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a line, and the at least one processor is used to run a computer program or instruction to execute the method according to any one of claims 1 to 23.

28. A computer program product, characterized in that The method comprises a computer program which, when being executed, causes a computer to execute the method according to any one of claims 1 to 23.

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