Abstract. The next generation wireless systems will consist of heterogeneous networks from cellular, Wi-Fi, WiMAX to other emerging access technologies. Vertical handoff occurs when a mobile terminal decides to switch between networks. One of the challenging problems during vertical handoff is the selection of an optimal network that maximizes end users satisfaction. This paper presents an intelligent vertical handoff decision algorithm that selects the target network based on the traffic class of the mobile user. The algorithm uses two modules, to estimate the handoff requirement and to select the optimal network. These modules utilize Fuzzy Logic and Genetic algorithm to make an intelligent vertical handoff decision.
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