Patent ID: 11956636
Assignee: NEC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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.