Patent · US Active

Security context handling in 5G during handover

US11019488B1 · kind B1 · utility

1Cited by

7References

15Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Noamen Ben Henda · Lambarudd, SE
Christine Jost · Dalby, SE
Monica Wifvesson · Lund, SE
Karl Norrman · Stockholm, SE

Key dates

Filing date	Jan 29, 2021
Grant date	May 25, 2021
Priority date	—
Expiry date	Jan 29, 2041

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2463/061
WIPO fieldDigital communication
WIPO sectorElectrical engineering

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. 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, and sends a key change indication to the UE, either directly or through some other network node. The UE can then derive the new NAS key from the old NAS key. In some embodiments, the AMF may provide a key generation parameter to the UE to use in deriving the new NAS key. In other embodiments, the target AMF may change one or more security algorithms.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.