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Coherent persistence is the main objective and has been a vital challenge in fourth generation wireless networks (FGWNs). “HANDOVER” is the best possible solution to achieve the coherent connectivity, which will be used for service persistence, when a mobile terminal (MT) is in overlapping area. To support coherent persistence in heterogeneous networks, the traditional Vertical Handover Management (VHM) approaches are not good enough. Hence, it is very important to deal with those challenges like selection of network and triggering of incompatible handover. In Heterogeneous wireless networks main test is constant association among the different networks like Wi-Fi, WI-Max, WLAN and WPAN etc. In this proposal, various Vertical handover decision techniques and schemes have been compared such as, Gray Relational Analysis (GRA) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). These approaches helps for the consistent connectivity form the mobile terminal by choosing the best network among the Visitor networks (VTs) those are available. Our proposal work mainly focused on that at the time of handover, the handover decision phase as well as to mitigate the processing delay. We also compared both the GRA and TOPSIS methods with the Quality of Service (QoS) parameters of the mobile terminal (MT) to acquire the connectivity with the best network.

Discriminate Vertical Handoff Time Using GRA and TOPSIS Algorithms in Heterogeneous Networks by Effect of Metrics