US-20260129543-A1 - METHOD FOR WIRELESS COMMUNICATION, AND TERMINAL DEVICE

US20260129543A1US 20260129543 A1US20260129543 A1US 20260129543A1US-20260129543-A1

Abstract

Provided are a method for wireless communication, and a terminal device. The method comprises: if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, a terminal device executing a first operation, wherein the first candidate cell is a conditional handover (CHO) candidate cell, the second candidate cell is a conditional primary secondary cell addition/change (CPAC) candidate cell, the first candidate cell is associated with the second candidate cell, and the first operation comprises one or more of the following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or reserving a service secondary cell group (SCG); evaluating the second candidate cell; stopping evaluation of the second candidate cell; evaluating the first candidate cell; stopping evaluation of the first candidate cell; and residing in a source cell.

Inventors

Xin YOU
Xue Lin

Assignees

GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date: 20260507
Application Date: 20251027

Claims (20)

1 . A method for wireless communication, comprising: executing, by a terminal device, a first operation if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, wherein the first candidate cell is a conditional handover (CHO) candidate cell, the second candidate cell is a conditional primary secondary cell addition/change (CPAC) candidate cell, and the first candidate cell is associated with the second candidate cell; and the first operation comprises one or more of following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or maintaining a serving secondary cell group (SCG); evaluating the second candidate cell; stopping evaluating the second candidate cell; evaluating the first candidate cell; stopping evaluating the first candidate cell; or camping on a source cell.
2 . The method according to claim 1 , wherein if the first operation comprises accessing the first candidate cell at the first time, the first time is determined based on a time at which the condition of the second candidate cell is met, or the first time is independent of a time at which the condition of the second candidate cell is met.
3 . The method according to claim 2 , wherein if the first time is determined based on the time at which the condition of the second candidate cell is met, the time at which the condition of the second candidate cell is met is determined based on a time at which a target condition of the second candidate cell is met, and the target condition is obtained by relaxing the condition of the second candidate cell.
4 . The method according to claim 1 , wherein if the first operation comprises accessing the first candidate cell at the first time, the first time is associated with a first timer, and the first timer is used to indicate duration of evaluating the second candidate cell.
5 . The method according to claim 4 , wherein a starting condition of the first timer comprises that the condition of the first candidate cell is met.
6 . The method according to claim 4 , wherein a restarting condition of the first timer comprises that a condition of a third candidate cell is met during running of the first timer, and the third candidate cell is a CHO-based candidate cell other than the first candidate cell; and/or wherein a stopping condition of the first timer comprises one or more of following: the condition of the second candidate cell is met; a measurement result of the source cell of the terminal device is lower than a threshold; a radio link failure (RLF) occurs in the source cell of the terminal device; or an RLF-related timer is started.
7 . The method according to claim 4 , wherein if the first time is a time after the first timer stops, the accessing the first candidate cell at the first time comprises accessing only the first candidate cell at the first time.
8 . The method according to claim 4 , wherein the method further comprises: releasing, by the terminal device, an SCG if the first timer expires.
9 . A terminal device, comprising a memory and a processor, wherein the memory is configured to store a program, and the processor is configured to execute the computer program to cause the terminal device to: execute a first operation if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, wherein the first candidate cell is a conditional handover (CHO) candidate cell, the second candidate cell is a conditional primary secondary cell addition/change (CPAC) candidate cell, and the first candidate cell is associated with the second candidate cell; and the first operation comprises one or more of following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or maintaining a serving secondary cell group (SCG); evaluating the second candidate cell; stopping evaluating the second candidate cell; evaluating the first candidate cell; stopping evaluating the first candidate cell; or camping on a source cell.
10 . The terminal device according to claim 9 , wherein if the first operation comprises maintaining the serving SCG, the serving SCG belongs to a candidate SCG list.
11 . The terminal device according to claim 10 , wherein a condition of the serving SCG is used to execute a CPC based on the serving SCG, and the processor is configured to execute the computer program to cause the terminal device further to: set the serving SCG to a deactivated state if the condition of the serving SCG is not met; and/or set the serving SCG to an activated state if the condition of the serving SCG is met.
12 . The terminal device according to claim 9 , wherein if the first operation comprises releasing the serving SCG, the serving SCG does not belong to a candidate SCG list; or wherein if the first operation comprises camping on the source cell, and the first operation is executed after a third timer stops, a stopping condition of the third timer comprises: signal quality of the first candidate cell is lower than a threshold; and/or signal quality of the source cell of the terminal device is higher than a threshold.
13 . The terminal device according to claim 9 , wherein if the first operation comprises evaluating the second candidate cell or stopping evaluating the second candidate cell, the processor is configured to execute the computer program to cause the terminal device further to: determine, based on first information, to evaluate the second candidate cell or to stop evaluating the second candidate cell.
14 . The terminal device according to claim 13 , wherein the first information is used to indicate evaluating the second candidate cell or stopping evaluating the second candidate cell.
15 . The terminal device according to claim 14 , wherein if the first information indicates stopping evaluating the second candidate cell, the first information is further used to determine to release or maintain a CPAC configuration of the second candidate cell.
16 . The terminal device according to claim 13 , wherein the first information is used to indicate a node that configures the condition of the second candidate cell, and the node comprises one or more of a source MN, a source SN, a candidate MN, or a candidate SN.
17 . The terminal device according to claim 16 , wherein if the first information indicates that the node is the source MN, the terminal device stops evaluating the second candidate cell; and/or if the first information indicates that the node is the candidate MN, and the terminal device is handed over to the candidate MN, the terminal device evaluates the second candidate cell; and/or if the first information indicates that the node is the source SN, and the terminal device is handed over to the first candidate cell and maintains the source SN, the terminal device evaluates the second candidate cell; and/or if the first information indicates that the node is the candidate SN, the terminal device evaluates the second candidate cell.
18 . The terminal device according to claim 13 , wherein the first information is used to indicate a node used to trigger a CPAC associated with the second candidate cell, and the node comprises one or more of a source MN, a source SN, or a candidate MN.
19 . The terminal device according to claim 18 , wherein if the first information indicates that the node is the source MN, the terminal device stops evaluating the second candidate cell; and/or if the first information indicates that the node is the candidate MN, and the terminal device is handed over to the candidate MN, the terminal device evaluates the second candidate cell; and/or if the first information indicates that the node is the source SN, and the terminal device is handed over to the first candidate cell and maintains the source SN, the terminal device evaluates the second candidate cell; and/or if the first information indicates that the node is the source SN, and the terminal device is handed over to the first candidate cell and releases the source SN, the terminal device stops evaluating the second candidate cell.
20 . A chip, comprising a processor, configured to invoke a program from a memory, to cause a device on which the chip is installed to execute a first operation if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, wherein the first candidate cell is a conditional handover (CHO) candidate cell, the second candidate cell is a conditional primary secondary cell addition/change (CPAC) candidate cell, and the first candidate cell is associated with the second candidate cell; and the first operation comprises one or more of following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or maintaining a serving secondary cell group (SCG); evaluating the second candidate cell; stopping evaluating the second candidate cell; evaluating the first candidate cell; stopping evaluating the first candidate cell; or camping on a source cell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2023/093325, filed on May 10, 2023, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the field of communications technologies, and more specifically, to a method for wireless communication and a terminal device. BACKGROUND In a process of a conditional handover (CHO), a terminal device may execute, based on a handover condition associated with the CHO, a handover based on a CHO candidate cell. In a process of a conditional primary secondary cell addition/change (CPAC), the terminal device may execute, based on an addition/change condition associated with the CPAC, a handover based on a CPAC candidate cell. However, in a scenario in which the CHO and the CPAC are combined, a conditional handover event associated with the CHO and the addition/change condition associated with the CPAC are configured independently. Therefore, the following case may exist: the conditional handover event associated with the CHO and the addition/change condition associated with the CPAC are not both met. Currently, a behavior of the terminal device is not specified in a communication protocol for the foregoing case. In this case, the terminal device may have an inconsistent understanding with a network device, thereby causing a failure in communication between the terminal device and the network device. SUMMARY This application provides a method for wireless communication and a terminal device. The following describes the aspects related to this application. According to a first aspect, a method for wireless communication is provided, including: executing, by a terminal device, a first operation if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, where the first candidate cell is a conditional handover CHO candidate cell, the second candidate cell is a conditional primary secondary cell addition/change CPAC candidate cell, and the first candidate cell is associated with the second candidate cell; and the first operation includes one or more of the following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or maintaining a serving secondary cell group SCG; evaluating the second candidate cell; stopping evaluating the second candidate cell; evaluating the first candidate cell; stopping evaluating the first candidate cell; or camping on a source cell. According to a second aspect, a method for wireless communication is provided, including: accessing, by a terminal device, a first candidate cell at a second time if a time at which a condition of a second candidate cell is met is different from a time at which a condition of the first candidate cell is met, where the first candidate cell is a conditional handover CHO candidate cell, the second candidate cell is a conditional primary secondary cell addition/change CPAC candidate cell, and the first candidate cell is associated with the second candidate cell. According to a third aspect, a terminal device is provided, including: a processing unit, configured to execute a first operation if a condition of a first candidate cell is met and a condition of a second candidate cell is not met, where the first candidate cell is a conditional handover CHO candidate cell, the second candidate cell is a conditional primary secondary cell addition/change CPAC candidate cell, and the first candidate cell is associated with the second candidate cell; and the first operation includes one or more of the following: accessing the first candidate cell at a first time; accessing the first candidate cell; releasing or maintaining a serving secondary cell group SCG; evaluating the second candidate cell; stopping evaluating the second candidate cell; evaluating the first candidate cell; stopping evaluating the first candidate cell; or camping on a source cell. According to a fourth aspect, a terminal device is provided, including: a processing unit, configured to access a first candidate cell at a second time if a time at which a condition of a second candidate cell is met is different from a time at which a condition of the first candidate cell is met, where the first candidate cell is a conditional handover CHO candidate cell, the second candidate cell is a conditional primary secondary cell addition/change CPAC candidate cell, and the first candidate cell is associated with the second candidate cell. According to a fifth aspect, a terminal device is provided, including a processor, a memory, and a communications interface, where the memory is configured to store one or more computer programs, and the processor is configured to invoke the computer program in the memory, to cause the terminal device to execute some or all of the steps in a method according to the foregoing aspects. According to a sixth aspect, an embodiment of