An enhanced model of vertical handoff decision based on fuzzy control theory & user preference

With the development of wireless communication technology, various wireless networks will exist with different features in same premises. Heterogeneous networks will be dominant in the next generation wireless networks. In such networks choose the most suitable network for mobile user is one of the key issues. Vertical handoff decision making is one of the most important topics in wireless heterogeneous networks architecture. Here the most significant parameters are considered in vertical handoff decision. The proposed method considered Received signal strength (RSS), Monetary Cost(C), Bandwidth (BW), Battery consumption (BC), Security (S) and Reliability (R). Handoff decision making is divided in two sections. First section calculates system obtained value (SOV) considering RSS, C, BW and BC. SOV is calculated using fuzzy logic theory. Today´s mobile user are very intelligent in deciding there desired type of services. User preferred network is choose from user priority list is called User obtained value (UOV). Then handoff decisions are made based on SOV & UOV to select the most appropriate network for the mobile nodes (MNs). Simulation results show that fuzzy control theory & user preference based vertical handoff decision algorithm (VHDA) is able to make accurate handoff decisions, reduce unnecessary handoffs decrease handoff calculation time and decrease the probability of call blocking and dropping.