US 11,877,149 B2
Protection of initial non-access stratum protocol message in 5G systems
Alexandre Saso Stojanovski, Paris (FR); Robert Zaus, Munich (DE); Farid Adrangi, Lake Oswego, OR (US); Raimund Wloka, Langenzenn (DE); Abhijeet Ashok Kolekar, Hillsboro, OR (US); and Ahmed Soliman, Nuremberg (DE)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/275,980
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Sep. 13, 2019, PCT No. PCT/US2019/051106
§ 371(c)(1), (2) Date Mar. 12, 2021,
PCT Pub. No. WO2020/060871, PCT Pub. Date Mar. 26, 2020.
Claims priority of provisional application 62/733,344, filed on Sep. 19, 2018.
Prior Publication US 2022/0070664 A1, Mar. 3, 2022
Int. Cl. H04W 12/037 (2021.01); H04W 12/121 (2021.01); H04W 12/106 (2021.01); H04L 9/30 (2006.01); H04W 12/06 (2021.01); H04W 48/18 (2009.01); H04W 60/00 (2009.01); H04W 84/04 (2009.01)
CPC H04W 12/037 (2021.01) [H04L 9/30 (2013.01); H04W 12/06 (2013.01); H04W 12/106 (2021.01); H04W 12/121 (2021.01); H04W 48/18 (2013.01); H04W 60/00 (2013.01); H04L 2209/34 (2013.01); H04L 2209/80 (2013.01); H04W 84/042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a memory configured to store a security context associated with a serving public land mobile network (PLMN); and
a processor configured to cause a user equipment (UE) to:
decode a public key from a serving public land mobile network (PLMN);
determine whether the security context is stored in the memory;
in response to a determination that the security context is not stored in the memory, encrypt at least one information element (IE) using the public key to form at least one encrypted IE; and
encode, for transmission to the serving PLMN, an initial non-access stratum (NAS) message, the initial NAS message comprising the at least one encrypted IE, the at least one encrypted IE including UE security capabilities, single network slice assistance information (S-NSSAI), and a key set identifier for next generation radio access network (ngKSI), wherein an entire NAS message payload of the initial NAS message is encrypted using the public key, wherein the initial NAS message is a first NAS message sent after the UE transitions from an idle state.