MOBILITY MANAGEMENT METHOD AND SYSTEM FOR TERMINAL IN WIRELESS RELAY SYSTEM

摘要

A mobility management method and system for user terminals (UE) in a wireless relay system is used for resolving the technical problem of making handovers for UE between different relay stations belonging to a same donor eNode B(DeNB). The method includes that: an X2 interface link is established between the relay stations belonging to the same DeNB; a source relay station transmits a handover request to a target relay station, and the target relay station performs permission of access control; if the target relay station permits the UE to access, the source relay station performs retransmission of user context and cached data; after the UE successfully accesses the target relay station, the target relay station notifies the DeNB that the link has changed, and the DeNB performs the link switching. In the handover flow of the invention, only some control for retransmitting data is needed between the source relay station and the target relay station, the retransmission through the DeNB and the process with a mobility management unit(MME) or serving gateway(GW) are not needed, the handover flow is simplified, and handover delay is decreased by a certain degree.