US 11,917,055 B2
Method and arrangement in a telecommunication system
Rolf Blom, Jarfalla (SE); Gunnar Mildh, Sollentuna (SE); and Karl Norrman, Stockholm (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed on Jul. 2, 2021, as Appl. No. 17/366,098.
Application 17/366,098 is a continuation of application No. 16/565,796, filed on Sep. 10, 2019, granted, now 11,075,749.
Application 16/565,796 is a continuation of application No. 16/043,596, filed on Jul. 24, 2018, granted, now 10,455,417, issued on Oct. 22, 2019.
Application 16/043,596 is a continuation of application No. 15/443,229, filed on Feb. 27, 2017, granted, now 10,057,055, issued on Aug. 21, 2018.
Application 15/443,229 is a continuation of application No. 14/568,329, filed on Dec. 12, 2014, granted, now 9,615,249, issued on Apr. 4, 2017.
Application 14/568,329 is a continuation of application No. 14/151,077, filed on Jan. 9, 2014, granted, now 8,938,076, issued on Jan. 20, 2015.
Application 14/151,077 is a continuation of application No. 12/677,675, granted, now 8,660,270, issued on Feb. 25, 2014, previously published as PCT/SE2008/050591, filed on May 20, 2008.
Claims priority of provisional application 60/972,955, filed on Sep. 17, 2007.
Prior Publication US 2021/0328775 A1, Oct. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/08 (2006.01); H04W 8/20 (2009.01); H04W 12/041 (2021.01); H04W 12/0471 (2021.01); H04W 92/10 (2009.01); H04L 9/40 (2022.01)
CPC H04L 9/083 (2013.01) [H04L 9/0816 (2013.01); H04L 9/0869 (2013.01); H04L 63/062 (2013.01); H04W 8/20 (2013.01); H04W 12/041 (2021.01); H04W 12/0471 (2021.01); H04L 2209/24 (2013.01); H04L 2209/80 (2013.01); H04L 2463/061 (2013.01); H04W 92/10 (2013.01)] 16 Claims
OG exemplary drawing
 
11. A user equipment (UE), the UE comprising:
processing circuitry;
wherein:
the UE is arranged to establish a security key for protecting Radio Resource Control/User Plane traffic exchanged with a serving radio base station; and
the processing circuitry is configured to:
send a Non access Stratum (NAS) message containing a NAS service request to a mobility management entity (MME), the NAS message indicating a NAS uplink sequence number; and
derive the security key from at least said indicated NAS uplink sequence number and from a stored access security management entity-key shared with said mobility management entity, using a key derivation function taking the NAS uplink sequence number and the stored access security management entity-key as inputs.