Optimization of authentication cost based on key caching for inter-MME handover support

In the long term evolution (LTE) network environment, a new authentication key must be created during the handover. The authentication process is performed by handover, authentication cost and delay time are caused. In this paper, we propose an efficient key caching handover technique of simplifying the authentication process by reusing the stored authentication key if old mobility management entity (oMME) stores the authentication key for a certain period of time and returns it to oMME within life time of the authentication key when user equipment (UE) is handed over from oMME to New mobility management entity (nMME).