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The fast and seamless Vertical HandOff (VHO) is the one of the major requirements for moving Mobile Terminal (MT) among heterogeneous networks. The vertical handoff decision should be carefully executed if there is a network preferred; it is based on many factors such as the wireless channel state, network layer characteristics and QoS requirements. In this paper, the performance of the vertical handoff algorithm was evaluated under two different consideration approaches for handoff process; one approach for MT's moving from Wireless Local Area Network (WLAN) to Cellular Network (CN), and inversely form MS's moving from CN to WLAN. In this paper, a new hybrid algorithm is proposed to evaluate the performance of VHO process.
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