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A prominent function of a mobile host is seamless Vertical HandOff (VHO) that ensures application service continuity and quality. VHO decision algorithms that have been proposed in the paper consider parameters such as wireless channel quality (RSSI), cost, channel load, and available bandwidth. The mobile node runs the VHO algorithm autonomously and makes the decision. The authors highlight the fact that such a local decision can potentially result in a poor end-to-end application level QoS. They present a VHO scheme that takes into account end-to-end QoS as one of the key parameters in addition to other common parameters.
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