公开(公告)号：US20230164548A1

公开(公告)日：2023-05-25

申请号：US18159188

申请日：2023-01-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Dagang ZHANG ,  Zhilong ZHENG

IPC: H04W12/03 ,  H04W12/0431 ,  H04W76/30 ,  H04W76/20

CPC classification number: H04W12/03 ,  H04W12/0431 ,  H04W76/30 ,  H04W76/20

Abstract: The present disclosure relates to data transmission methods and devices. One example data transmission method relates to a primary network device, a secondary network device, and a terminal device. When a carrier change occurs (for example, the secondary network device is to be added, the secondary network device is to be deleted, or the secondary network device is to be changed), the primary network device sends a first message to the terminal device. Before the carrier change, the terminal device performs data encryption and decryption by using a key of the primary network device. The first message indicates the terminal device to still perform, after the carrier change, data encryption and decryption by using the key that is of the primary network device and that is stored in the terminal device.