Handover method, communications apparatus, and terminal device

Patent metadata

Field	Value
Publication number	US-12160728-B2
Application number	US-202217667405-A
Country	US
Kind code	B2
Filing date	Feb 8, 2022
Priority date	Aug 9, 2019
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

This disclosure provides a handover method, a communications apparatus, and a terminal device. The handover method includes determining a first target cell based on first conditional handover (CHO) configuration information, where the first target cell is a cell to which the terminal device is to be handed over, and in a process of attempting to access the first target cell, when receiving second CHO configuration information, determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell.

First claim

What is claimed is:

1. A handover method performed by a terminal device, the method comprising:
determining a first target cell in a network based on first conditional handover (CHO) configuration information, the first target cell being a cell to which the terminal device is to be handed over;
starts a process of attempting to access the determined first target cell;
receiving second CHO configuration information while in the process of attempting to access the determined first target cell; and
determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell, wherein the process of attempting to access the determined first target cell comprises:
a process that is initiated prior to sending a preamble to the first target cell; and/or
a process of performing random access to the first target cell.

2. The handover method according to claim 1 , wherein the determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell comprises:
determining, based on the second CHO configuration information, whether a CHO configuration parameter included in the second CHO and corresponding to the first target cell does not change, and
determining to continue to be handed over to the first target cell after determining that the CHO configuration parameter does not change.

3. The handover method according to claim 1 , wherein, when handover to the first target cell is not completed, the method further comprises:
determining, based on the second CHO configuration information alone or in combination with the first CHO configuration information, a second target cell to which the terminal device is to be handed over.

4. The handover method according to claim 1 , wherein the determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell comprises:
determining, based on the second CHO configuration information, that a CHO configuration parameter included in the second CHO configuration information and corresponding to the first target cell changes; and
determining, based on the second CHO configuration information alone or in combination with the first CHO configuration information, a third target cell to which the terminal device is to be handed over.

5. The handover method according to claim 1 , wherein the first CHO configuration information and/or the second CHO configuration information is carried in a radio resource control (RRC) message.

6. The method according to claim 1 , wherein the second CHO configuration information is used to change, based on the first CHO configuration information, the first target cell configured by using the first CHO configuration information.

7. The method according to claim 1 , wherein, based on the first CHO configuration information, the second CHO configuration information is used to modify a configuration parameter of the first target cell configured using the first CHO configuration information, and/or to remove the first target cell configured using the first CHO configuration information.

8. The method according to claim 7 , wherein the configuration parameter of the first target cell includes: a CHO trigger condition corresponding to the first target cell, a cell radio network temporary identifier (C-RNTI) allocated by the first target cell to the terminal device, a random access channel (RACH) resource required for accessing the first target cell, and/or resource information corresponding to the first target cell.

9. A communications apparatus, comprising:
a processor;
a memory coupled to the processor, the memory comprising instructions that, when executed by the processor, cause the communications apparatus to:
determine a first target cell based on first conditional handover (CHO) configuration information, the first target cell being a cell to which a terminal device is to be handed over; and
in a process of attempting to access the determined first target cell, when receiving second CHO configuration information, determine, based on the second CHO configuration information, whether to continue to be handed over to the first target cell, wherein the process of attempting to access the determined first target cell comprises:
a process that is initiated prior to sending a preamble to the first target cell; and/or
a process of performing random access to the first target cell.

10. The communications apparatus according to claim 9 , wherein the determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell comprises:
determining, based on the second CHO configuration information, whether a CHO configuration parameter included in the second CHO and corresponding to the first target cell does not change, and
determining to continue to be handed over to the first target cell after determining the CHO configuration parameter does not change.

11. The communications apparatus according to claim 9 , wherein when handover to the first target cell is not completed, the instructions, when executed by the processor, further cause the communications apparatus to:
determine, based on the second CHO configuration information alone or in combination with the first CHO configuration information, a second target cell to which the terminal device is to be handed over.

12. The communications apparatus according to claim 9 , wherein the determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell comprises:
determining that a configuration parameter included in the second CHO and corresponding to the first target cell has changed; and
determining, based on the second CHO configuration information alone or in combination with the first CHO configuration information, a third target cell to which the terminal device is to be handed over.

13. The communications apparatus according to claim 9 , wherein the first CHO configuration information and/or the second CHO configuration information is carried in a radio resource control (RRC) message.

14. A non-transitory, computer-readable medium storing computer-executable instructions that, when executed by one or more processors of a computer, cause the computer to perform operations comprising:
determining a first target cell in a network based on first conditional handover (CHO) configuration information, the first target cell being a cell to which a terminal device is to be handed over;
starts a process of attempting to access the first target cell;
receiving second CHO configuration information while in the process of attempting to access the determined first target cell; and
determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell, wherein the process of attempting to access the determined first target cell comprises:
a process that is initiated prior to sending a preamble to the first target cell; and/or
a process of performing random access to the first target cell.

15. The non-transitory, computer-readable medium according to claim 14 , wherein the determining, based on the second CHO configuration information, whether to continue to be handed over to the first target cell comprises:
determining, based on the second CHO configuration information, that a CHO configuration parameter included in the second CHO configuration information and corresponding to the first target cell does not change; and
determining to continue to be handed over to the first ta

Assignees

• Huawei Tech Co Ltd

Inventors

• Yan Le
• Geng Tingting

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04W36/0058 Primary

  Transmission of hand-off measurement information, e.g. measurement reports · CPC title

• H04W36/08

  Reselecting an access point · CPC title

• H04W36/304

  due to measured or perceived resources with higher communication quality · CPC title

• H04W36/362

  Conditional handover · CPC title