US-20260129531-A1 - WIRELESS COMMUNICATION METHOD, TERMINAL DEVICE, AND NETWORK DEVICE

US20260129531A1US 20260129531 A1US20260129531 A1US 20260129531A1US-20260129531-A1

Abstract

Provided are a wireless communication method, a terminal device, and a network device. The method comprises: if a terminal device determines to hand over to a first LTM candidate cell, the terminal device executes a first operation, wherein the first operation comprises one or more of the following: initiating a random access procedure; and transmitting first uplink data in the first LTM candidate cell on the basis of a first CG resource, the transmission of the first uplink data being a first uplink transmission of the terminal device in the first LTM candidate cell.

Inventors

Xue Lin
Xin YOU

Assignees

GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date: 20260507
Application Date: 20260107

Claims (20)

1 . A wireless communication method, comprising: performing, by a terminal device, a first operation in a case that the terminal device determines to be handed over to a first layer 1 /layer 2 -triggered mobility LTM candidate cell, wherein the first operation comprises one or more of following: initiating a random access procedure; or transmitting first uplink data in the first LTM candidate cell based on a first configured grant CG resource, the transmitting of the first uplink data being a first uplink transmission performed by the terminal device in the first LTM candidate cell.
2 . The method according to claim 1 , wherein the first operation is determined based on one or more of following information: configuration information of the first LTM candidate cell; beam measurement information; a first time determined based on a reception time of a first instruction or an LTM execution time, the first instruction being used to instruct the terminal device to be handed over to the first LTM candidate cell; or a second time determined based on a time domain location corresponding to a CG resource associated with a first beam in the first CG resource, the first beam being a beam indicated by the first instruction or a beam selected by the terminal device based on layer-1 measurement.
3 . The method according to claim 2 , wherein the performing, by the terminal device, the first operation comprises: initiating, by the terminal device, a random access procedure in a case that no CG resource is configured in the configuration information of the first LTM candidate cell; and/or transmitting, by the terminal device, the first uplink data based on the first CG resource in a case that the first CG resource is configured in the configuration information of the first LTM candidate cell.
4 . The method according to claim 2 , wherein the performing, by the terminal device, the first operation comprises: in a case that no CG resource associated with the first beam is configured in the configuration information of the first LTM candidate cell, initiating, by the terminal device, a random access procedure; and/or in a case that the first CG resource configured by the first LTM candidate cell comprises a CG resource associated with the first beam, transmitting, by the terminal device, the first uplink data based on the CG resource associated with the first beam.
5 . The method according to claim 2 , wherein the performing, by the terminal device, the first operation comprises: in a case that a time interval between the second time and the first time is greater than a first threshold, initiating, by the terminal device, a random access procedure; and/or in a case that the time interval between the second time and the first time is less than or equal to the first threshold, transmitting, by the terminal device, the first uplink data based on the CG resource associated with the first beam in the first CG resource.
6 . The method according to claim 2 , wherein the performing, by the terminal device, the first operation comprises: in a case that a first condition is satisfied before the first uplink data is transmitted, performing, by the terminal device, one of following operations: initiating a random access procedure; and transmitting the first uplink data based on a CG resource associated with a second beam in the first CG resource, wherein the first condition is associated with one or more of following: beam measurement information of the first beam; or beam measurement information of the second beam, wherein beam quality of the second beam is higher than beam quality of the first beam.
7 . The method according to claim 6 , wherein the first condition comprises one or more of following: the beam quality of the first beam being less than or equal to a second threshold; a difference between the beam quality of the second beam and the beam quality of the first beam being greater than or equal to a third threshold; or the second beam being a beam having the highest beam quality indicated by the beam measurement information.
8 . The method according to claim 1 , wherein the method further comprises: starting, by the terminal device, a second timer after transmitting the first uplink data based on the first CG resource; and retransmitting, by the terminal device, the first uplink data when the second timer expires.
9 . The method according to claim 1 , wherein the initiating, by the terminal device, the random access procedure comprises: in a case that a contention-free random access CFRA resource is configured in configuration information of the first LTM candidate cell, initiating, by the terminal device, a CFRA procedure; and/or in a case that no CFRA resource is configured in the configuration information of the first LTM candidate cell, initiating, by the terminal device, a contention-based random access CBRA procedure.
10 . The method according to claim 1 , wherein the initiating, by the terminal device, the random access procedure comprises: initiating, by the terminal device, the random access procedure by using a random access resource associated with a first beam, wherein the first beam is a beam indicated by a first instruction or a beam selected by the terminal device based on layer-1 measurement, the first instruction being used to instruct the terminal device to be handed over to the first LTM candidate cell.
11 . A terminal device, comprising a memory and a processor, wherein the memory is configured to store a computer program, and the processor is configured to execute the computer program to cause the terminal device to: perform a first operation in a case that the terminal device determines to be handed over to a first layer 1 /layer 2-triggered mobility LTM candidate cell, wherein the first operation comprises one or more of following: initiating a random access procedure; or transmitting first uplink data in the first LTM candidate cell based on a first configured grant CG resource, the transmitting of the first uplink data being a first uplink transmission performed by the terminal device in the first LTM candidate cell.
12 . The terminal device according to claim 11 , wherein the first operation is determined based on one or more of following information: configuration information of the first LTM candidate cell; beam measurement information; a first time determined based on a reception time of a first instruction or an LTM execution time, the first instruction being used to instruct the terminal device to be handed over to the first LTM candidate cell; or a second time determined based on a time domain location corresponding to a CG resource associated with a first beam in the first CG resource, the first beam being a beam indicated by the first instruction or a beam selected by the terminal device based on layer- 1 measurement.
13 . The terminal device according to claim 12 , wherein the terminal device is configured to: initiate a random access procedure in a case that no CG resource is configured in the configuration information of the first LTM candidate cell; and/or transmit the first uplink data based on the first CG resource in a case that the first CG resource is configured in the configuration information of the first LTM candidate cell.
14 . The terminal device according to claim 12 , wherein the termimal device is configured to: in a case that no CG resource associated with the first beam is configured in the configuration information of the first LTM candidate cell, initiate a random access procedure; and/or in a case that the first CG resource configured by the first LTM candidate cell comprises a CG resource associated with the first beam, transmit the first uplink data based on the CG resource associated with the first beam.
15 . The terminal device according to claim 12 , wherein the terminal device is configured to: in a case that a time interval between the second time and the first time is greater than a first threshold, initiate a random access procedure; and/or in a case that the time interval between the second time and the first time is less than or equal to the first threshold, transmit the first uplink data based on the CG resource associated with the first beam in the first CG resource.
16 . The terminal device according to claim 12 , wherein the terminal device is configured to: in a case that a first condition is satisfied before the first uplink data is transmitted, perform one of following operations: initiating a random access procedure; and transmitting the first uplink data based on a CG resource associated with a second beam in the first CG resource, wherein the first condition is associated with one or more of following: beam measurement information of the first beam; or beam measurement information of the second beam, wherein beam quality of the second beam is higher than beam quality of the first beam.
17 . The terminal device according to claim 16 , wherein the first condition comprises one or more of following: the beam quality of the first beam being less than or equal to a second threshold; a difference between the beam quality of the second beam and the beam quality of the first beam being greater than or equal to a third threshold; or the second beam being a beam having the highest beam quality indicated by the beam measurement information.
18 . The terminal device according to claim 11 , wherein the terminal device is further configured: start a second timer after transmitting the first uplink data based on the first CG resource; and retransmit the first uplink data when the second timer expires.
19 . The terminal device according to claim 11 , wherein the terminal device is configured to: in a case that a contention-free random access CFRA resource is configured in configuration information of the first LTM candidate cell, initiate a CFRA procedure; and/or in a case that no CFRA resource is configured in the configuration information of the first LTM candidate cell, initiate a contention-based random access CBRA procedure.
20 . A chip, comprising a processor, configured to invoke a program from a memory, to cause a device installed with the chip to execute the method according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2023/112691, filed on August 11, 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 wireless communication method, a terminal device, and a network device. RELATED ART A layer 1/layer 2-triggered mobility (LTM) procedure is a cell handover procedure triggered based on L1/L2 signalling. In an LTM procedure, when a terminal device determines to be handed over to an LTM candidate cell, how to access the LTM candidate cell is a problem to be resolved. SUMMARY Embodiments of this application provide a wireless communication method, a terminal device, and a network device. The following describes in detail various aspects involved in embodiments of this application. According to a first aspect, a wireless communication method is provided, and includes: performing, by a terminal device, a first operation in a case that the terminal device determines to be handed over to a first LTM candidate cell, where the first operation includes one or more of following: initiating a random access procedure; or transmitting first uplink data in the first LTM candidate cell based on a first CG resource, the transmitting of the first uplink data being a first uplink transmission performed by the terminal device in the first LTM candidate cell. According to a second aspect, a terminal device is provided, and includes a memory and a processor, where the memory is configured to store a computer program, and the processor is configured to execute the computer program to cause the terminal device to: perform a first operation in a case that the terminal device determines to be handed over to a first LTM candidate cell, where the first operation includes one or more of following: initiating a random access procedure; or transmitting first uplink data in the first LTM candidate cell based on a first CG resource, the transmitting of the first uplink data being a first uplink transmission performed by the terminal device in the first LTM candidate cell. According to a third aspect, a chip is provided, and includes a processor, configured to invoke a program from a memory, to cause a device on which the chip is installed to execute the method according to the first aspect. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an example diagram of a system architecture of a wireless communications system to which embodiments of this application are applicable. FIG. 2 is a schematic diagram of a cell handover procedure based on L3 measurement. FIG. 3 is a schematic diagram of a cell handover procedure based on LTM. FIG. 4 is a schematic flowchart of a wireless communication method according to Embodiment 1 of this application. FIG. 5 is an example diagram of a time interval between a reception time of a first instruction and a transmission opportunity of a CG resource, according to an embodiment of this application. FIG. 6 is a schematic flowchart of a wireless communication method according to Embodiment 2 of this application. FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of this application. FIG. 8 is a schematic structural diagram of a terminal device according to another embodiment of this application. FIG. 9 is a schematic structural diagram of a network device according to an embodiment of this application. FIG. 10 is a schematic structural diagram of an apparatus according to an embodiment of this application. DESCRIPTION OF EMBODIMENTS Technical solutions in this application are described below with reference to the accompanying drawings. Communications system architecture FIG. 1 is an example diagram of a system architecture of a wireless communications system 100 to which embodiments of this application are applicable. The wireless communications system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area, and may communicate with the terminal device 120 located within the coverage. FIG. 1 shows one network device and one terminal device as an example. Optionally, the wireless communications system 100 may include one or more network devices 110, and/or one or more terminal devices 120. For a network device 110, the one or more terminal devices 120 may be located within network coverage of the network device 110, or may be located outside network coverage of the network device 110, or may be located partially within the network coverage of the network device 110, and may be located partially outside the network coverage of the network device 110, which is not limited in embodiments of this application. Optionally, the wireless communications system 100 may further