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Mobility prediction algorithm is the significant aspect to improve QoS (Quality of Service) for heterogeneous wireless networks because it can accurately predict user' s trajectory, decrease handoff latency and preserve resources in arriving cell for user. Considering inaccurate description of existing mobility prediction algorithms for mobile user's location in heterogeneous wireless networks, this paper proposes that Overlay Coverage Zone (OCZ) can be used to precisely describe user's location, flexibly depict the mobile user's characteristics and vertical handoffs among different wireless networks.
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