METHOD AND APPARATUS FOR INTER-SYSTEM HANDOVER

摘要

An inter-system handover system for a wireless communication system suppo rts hand-down and hand-up of user equipment (UE) to different radio access t echnologies, including synchronous and asynchronous systems. Latency and han dover connection failures are reduced by an access node (nodeB) broadcasting information about neighboring systems (targets) when the UE reception (RX) capability is both inside or outside the reception range of the target. A si ngle RX chain is sufficient, although transitioning between a wireless wide area network (WWAN) to a wireless local area network may (WLAN) may advantag eously benefit from simultaneous operation on two Rx chains. Optimized list of neighboring RAT systems (targets) are broadcast from the network, includi ng measurement parameters and reporting instructions. Thereby, UE-driven rep orting minimizes latencies. UE reports other-system searches to network only if needed for a handover. In addition, handover requests can be bundled wit h other-system measurement information, if necessary, for additional efficie ncies.