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:
Feb. 07, 2023
Filed:
Apr. 23, 2020
Applicant:
Huawei Technologies Co., Ltd., Shenzhen, CN;
Assignee:
HUAWEI TECHNOLOGIES CO., LTD., Shenzhen, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04W 12/041 (2021.01); H04W 4/70 (2018.01); H04L 9/08 (2006.01); H04W 8/02 (2009.01); H04W 36/00 (2009.01); H04W 12/106 (2021.01); H04W 12/0433 (2021.01);
U.S. Cl.
CPC ...
H04W 12/041 (2021.01); H04L 9/0869 (2013.01); H04W 4/70 (2018.02); H04W 8/02 (2013.01); H04W 12/0433 (2021.01); H04W 12/106 (2021.01); H04W 36/0022 (2013.01); H04L 2209/80 (2013.01);
Abstract
A method includes receiving, by a mobility management entity (MME), a redirection request message from an access and mobility management function (AMF) node, where the redirection request message includes key-related information. The method also includes generating, by the MME, an encryption key and an integrity protection key based on the key-related information. The redirection request message is used to request to hand over a voice service from a packet switched (PS) domain to a circuit switched (CS) domain.