Patent ID: 8520636
Filing Date: 2013-08-27
Classification: H04L,H04W

Abstract:
1. A method for performing a handover by a source base station, the method comprising: transmitting a handover requirement message, for a handover to a destination base station of a user equipment (UE), to a source base station gateway; when a handover command message indicating performing of the handover to the destination base station of the UE is received from the source base station gateway, transmitting the handover command message to the UE; when a UE context release command message is received from the source base station gateway, releasing a context of the UE; and transmitting a UE context release completion message to the source base station gateway, wherein the handover requirement message comprises a Next-hop Chaining Counter (NCC) and an encryption key for a communication between the UE and the destination base station, and wherein the NCC and the encryption key are transmitted to the destination base station from a destination base station gateway, after the NCC and the encryption key are delivered to the destination base station gateway from the source base station gateway.