Patent ID: 9241261
Filing Date: 2016-01-19
CPC Classification: H04L,H04W

Claim Text:
1. A method of security negotiation for idle state mobility from a first network to a long term evolution (LTE) network using a mobility management entity (MME), the method comprising: transmitting an authentication vector-related key from a service general packet radio service (GPRS) support node (SGSN) in the first network to the MME; receiving security capabilities of a user equipment (UE) including non-access stratum (NAS) security capabilities of the UE from the UE; selecting a NAS security algorithm supported by the NAS security capabilities of the UE; sending a message that indicates the selected NAS security algorithm to the UE; and deriving a NAS protection key with the selected NAS security algorithm from the authentication vector-related key.