The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 2025
Filed:
Jan. 25, 2023
Huawei Technologies Co., Ltd., Guangdong, CN;
Dagang Zhang, Dongguan, CN;
Zhilong Zheng, Shenzhen, CN;
Huawei Technologies Co., Ltd., Shenzhen, CN;
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.