US 12,408,088 B2
Inter-system handover method and communication apparatus
Xingxing Hu, Shanghai (CN); Hongping Zhang, Shenzhen (CN); and Wenjie Peng, Shanghai (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Aug. 12, 2022, as Appl. No. 17/819,398.
Application 17/819,398 is a continuation of application No. PCT/CN2021/075718, filed on Feb. 7, 2021.
Claims priority of application No. 202010093924.6 (CN), filed on Feb. 14, 2020.
Prior Publication US 2022/0386186 A1, Dec. 1, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 36/14 (2009.01)
CPC H04W 36/0061 (2013.01) [H04W 36/0022 (2013.01); H04W 36/00698 (2023.05); H04W 36/144 (2023.05)] 21 Claims
OG exemplary drawing
 
1. A method, comprising:
sending, by a first core network device of a first core network, a handover request message to a first access network device, wherein the handover request message comprises an identity of a terminal device, and wherein a communications system comprises the first access network device and the first core network device;
receiving, by the first access network device, the handover request message from the first core network device;
determining, by the first access network device, that a secondary access network device to be added for the terminal device is a second access network device; and
sending, by the first access network device to the second access network device, a request message for adding the second access network device as the secondary access network device of the terminal device, the request message comprising the identity of the terminal device; and
wherein the first access network device is configured to provide the terminal device with a service for connecting to the first core network, and the second access network device is configured to, before serving as the secondary access network device for the terminal device, provide the terminal device with a service for connecting to a second core network.