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Mobility management and on top of that, vertical handoffs remains as one of the most challenging obstacles in 4G evolution. In this paper, the authors present Vertical Fast Handoff protocol as a solution to the mobility issues in integrated WLAN-UMTS networks which utilizes Early Binding Update technique to achieve reasonable performance. It contains several key factors including new network modules and procedures. In order to evaluate the performance, an analytical model is presented that includes metrics describing handoff and packet delivery delays, and signaling overhead. Based on the assessments, it is shown that the proposed method exhibits tolerable performance in terms of delays as well as signaling overhead.
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