A reliable proxy based vertical handover mechanism between WLAN and EVDO networks

In the past decade, there was an enormous increase in the subscribers of Radio Access Networks (RANs) demanding ubiquitous quality of service (QoS), and continuous availability of connectivity. Therefore, Next Generation Networks (NGNs) are in high demand, which could imperatively combine multiple RANs to form a heterogeneous IP network. As mobile user moves across heterogeneous networks, there is a need of maintaining connectivity for continuous network availability. It is important to take seamless vertical handover as a fundamental step. In this research, we propose a Received Signal Strength (RSS)-controlled Vertical Handoff decision scheme. Moreover, for continuous connectivity, we have also presented a novel proxy based system architecture for end to end seamless mobility management during the handoff process. Using experimental setup, we have validated the efficacy of our scheme by analyzing TCP handoff behavior in different mobility scenarios.