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IEEE 802.21 standard and its services address the challenges of seamless mobility for multi-interface devices. The authors focus on a proof-of-concept implementation that integrates IEEE 802.21 services and a pre-authentication framework, to optimise handover performance in two different scenarios. The first scenario is initiated by the mobile node and the second one is initiated by the network. They present the measurement results for realising these scenarios. Finally, the authors describe the implementation challenges and lessons learned through this exercise.
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