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:
May. 13, 2025
Filed:
Nov. 03, 2023
Applicant:
Telefonaktiebolaget Lm Ericsson (Publ), Stockholm, SE;
Inventors:
Noamen Ben Henda, Vällingby, SE;
Christine Jost, Lund, SE;
Karl Norrman, Stockholm, SE;
Monica Wifvesson, Lund, SE;
Assignee:
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04W 12/041 (2021.01); H04L 9/40 (2022.01); H04W 12/0433 (2021.01); H04W 36/00 (2009.01); H04W 36/38 (2009.01); H04W 48/20 (2009.01); H04W 60/02 (2009.01); H04W 36/14 (2009.01);
U.S. Cl.
CPC ...
H04W 12/041 (2021.01); H04L 63/062 (2013.01); H04W 12/0433 (2021.01); H04W 36/0038 (2013.01); H04W 36/385 (2013.01); H04W 48/20 (2013.01); H04W 60/02 (2013.01); H04L 2463/061 (2013.01); H04W 36/142 (2023.05);
Abstract
The present disclosure relates to methods and apparatus for flexible, security context management during AMF changes. One aspect of the disclosure is a mechanism for achieving backward security during AMF changes in idle mode. Instead of passing the current NAS key to the target AMF, the source AMF derives a new NAS key, provides the new NAS key to the target AMF, along with a key change indication indicating that the NAS key has changed. The target AMF sends the key change indication to the user equipment.