COMMUNICATION SYSTEM ADAPTED FOR KEY DERIVATION DURING HANDOVER

摘要

A communication system is disclosed comprising a gateway connecting a source base station and a target base station. The gateway receives a message from the source base station initiating a handover of a mobile device from the source to the target base station. The received message comprises a security context (an NCC-KeNB pair and/or a KeNB*) for securing communications with the mobile device, and for deriving a further key for securing subsequent communications with the mobile device. The gateway generates and sends, to the target base station, a message requesting the target base station to carry out a handover, the message comprising the security context.