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Motivation Deployment of heterogeneous access systems combined with IP convergence (WLAN, WiMax, 3G) requires enhanced network controlled mobility Inter system handovers WLAN deployments lack network control of roaming users Steering of roaming: NAPs do not belong to mobile operators (inter domain) We have solutions for Mobile Initiated and network assisted (L2 triggers, FMIv6 alike solutions) Need to understand Network Initiated Handover i.e. the trigger generates in the network ?NEED for a flexible framework supporting both kind of handovers |