US 11,956,636 B2
Communication terminal, network device, communication method, and non-transitory computer readable medium
Hironori Ito, Tokyo (JP); Anand Raghawa Prasad, Tokyo (JP); Andreas Kunz, Heidelberg (DE); Sivabalan Arumugam, Tamil Nadu (IN); Sivakamy Lakshminarayanan, Tamil Nadu (IN); and Sheeba Backia Mary Baskaran, Tamil Nadu (IN)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Dec. 13, 2022, as Appl. No. 18/080,184.
Application 18/080,184 is a continuation of application No. 17/201,280, filed on Mar. 15, 2021, granted, now 11,553,345.
Application 17/201,280 is a continuation of application No. 16/494,600, granted, now 11,019,495, issued on May 25, 2021, previously published as PCT/JP2018/010572, filed on Mar. 16, 2018.
Claims priority of application No. 201711009358 (IN), filed on Mar. 17, 2017.
Prior Publication US 2023/0104549 A1, Apr. 6, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 12/106 (2021.01); H04W 12/037 (2021.01); H04W 12/041 (2021.01); H04W 12/08 (2021.01); H04W 36/14 (2009.01); H04W 48/18 (2009.01)
CPC H04W 12/106 (2021.01) [H04W 12/037 (2021.01); H04W 12/041 (2021.01); H04W 12/08 (2013.01); H04W 36/14 (2013.01); H04W 48/18 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A communication terminal comprising:
at least one processor comprising hardware; and
at least one memory operatively coupled with the at least one processor, wherein
the at least one processor is configured to:
obtain a security context of the communication terminal, and
derive, using information included in the security context of the communication terminal, at least one security key to be used in a second communication network having a second network device operating as an access and mobility management function (AMF) during a handover procedure to handover the communication terminal from a first communication network having a first network device operating as a mobility management entity (MME) to the second communication network,
wherein the security context is obtained after the first network device checks access rights and security capabilities of the communication terminal during the handover procedure, and
wherein the first communication network comprises an evolved packet system (EPS) network and the second communication network comprises a 5th generation system (5GS) network.