APPARATUS AND METHOD FOR TRANSITIONING FROM SERVING NETWORK NODE SUPPORTING ENHANCED SECURITY CONTEXT TO LEGACY SERVING NETWORK NODE Russian patent published in 2014 - IPC H04W36/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to mobile communication. A remote station provides at least one legacy key and generates at least one session key based on an information element associated with an enhanced security context. The remote station forwards a first message having the information element to the new serving network node. The remote station receives a second message, from the new serving network node, having a response based on either the legacy key or the session key. The remote station determines that the new serving network node does not support the enhanced security context if the response of the second message is based on the legacy key and protects data transmission based on the legacy key upon determining that the enhanced security context is not supported.

EFFECT: facilitating interaction of a remote station with serving network nodes which support an enhanced security context and with legacy serving network nodes.

18 cl, 10 dwg