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Vertical Handover for Heterogeneous Wireless Networks of Packet Loss Using NS-2

— In a heterogeneous wireless networks, the main challenge is continual connection among the different networks like Wi-Fi, WIMAX, WLAN, WPAN, Internet, Intranet etc. The main theme of this research is to observe the conditions based on which vertical handoff should be performed. Multi Attribute Decision Making (MADM) helps to select the best network from the available Visible Network (VTs) for sequential connection by the terminal of mobile. VHDS (Vertical Handover Decision Schemes) used two types, Trusted-Distributed Vertical Handover Decision Scheme (T-DVHD) and Distributed Handover Decision Scheme (DVHD). The Centralized Vertical Handover Decision Scheme is the advanced Scheme of DVHD and the T-DVHD is the extended work of DVHD. Here we individually evaluate the internet, intranet and Wi-Fi network performance before performing the handover process. The network performance is evaluated by the packet loss. MADM algorithms of SAW and TOPSIS where compared to reduce the processing, reduce the packet dropping ratio and also select the best network.