US 12,137,380 B2
Security context in a wireless communication system
Prajwol Kumar Nakarmi, Sollentuna (SE); Karl Norrman, Stockholm (SE); and Monica Wifvesson, Lund (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed on Nov. 23, 2021, as Appl. No. 17/533,684.
Application 17/533,684 is a continuation of application No. 17/157,685, filed on Jan. 25, 2021, granted, now 11,184,812.
Application 17/157,685 is a continuation of application No. 16/321,563, granted, now 10,939,334, issued on Mar. 2, 2021, previously published as PCT/EP2018/074871, filed on Sep. 14, 2018.
Claims priority of provisional application 62/559,245, filed on Sep. 15, 2017.
Prior Publication US 2022/0086706 A1, Mar. 17, 2022
Int. Cl. H04W 36/00 (2009.01); H04L 5/00 (2006.01); H04W 8/08 (2009.01); H04W 12/04 (2021.01); H04W 48/16 (2009.01); H04W 76/25 (2018.01)
CPC H04W 36/0038 (2013.01) [H04L 5/0055 (2013.01); H04W 8/08 (2013.01); H04W 12/04 (2013.01); H04W 48/16 (2013.01); H04W 76/25 (2018.02)] 14 Claims
OG exemplary drawing
 
1. A method performed by equipment configured for use in a wireless communication system, wherein the wireless communication system comprises a core network and a radio access network, the method comprising:
during or in association with a handover procedure for handover of a user equipment, receiving signaling from the core network equipment indicating that a new non-access stratum (NAS) security context between the user equipment and the core network equipment is to be used as a basis for an access stratum (AS) security context between the user equipment and radio access network equipment, wherein
the signaling is performed in response to the core network equipment determining that the new NAS security context has been activated by the core network equipment, that the new NAS security context is different from a NAS security context on which a currently active AS security context is based, and that the core network equipment has not yet performed an explicit security context modification procedure that prompts the radio access network equipment included in the radio access network and the user equipment to switch to using a new AS security context based on the new NAS security context.