US 11,937,079 B2
Communication terminal, core network device, core network node, network node, and key deriving method
Hironori Ito, Tokyo (JP); Sivakamy Lakshminarayanan, Chennai (IN); Anand Raghawa Prasad, Tokyo (JP); Sivabalan Arumugam, Chennai (IN); and Sheeba Backia Mary Baskaran, Chennai (IN)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 16/650,997
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Sep. 27, 2018, PCT No. PCT/JP2018/036074
§ 371(c)(1), (2) Date Mar. 26, 2020,
PCT Pub. No. WO2019/065897, PCT Pub. Date Apr. 4, 2019.
Claims priority of application No. 201711034337 (IN), filed on Sep. 27, 2017.
Prior Publication US 2020/0280849 A1, Sep. 3, 2020
Int. Cl. H04W 12/041 (2021.01); H04L 9/40 (2022.01); H04W 12/06 (2021.01)
CPC H04W 12/041 (2021.01) [H04L 63/18 (2013.01); H04W 12/06 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A communication terminal comprising:
at least one processor; and
at least one memory operatively coupled with the processor, wherein the at least one processor is configured to:
initiate registration in a network node over 3GPP access and Non-3GPP access; and
establish a first Non-Access Stratum (NAS) connection for the 3GPP access and a second NAS connection for the Non-3GPP access with the network node in a network,
wherein the first NAS connection is specified by a first parameter,
wherein the second NAS connection is specified by a second parameter,
wherein the first parameter and the second parameter are for NAS security,
wherein the first parameter is a first fixed value corresponding to the 3GPP access,
wherein the second parameter is a second fixed value corresponding to the Non-3GPP access, and
wherein the at least one processor is further configured to:
derive a first security key using at least the first fixed value;
derive a second security key using the first security key; and
protect a Radio Resource Control (RRC) message using the second security key.