Vertical Handover Decision Making Using Fuzzy Logic

Abstract

In recent years mobile users can move between heterogeneous networks (networks with different operating system and/or protocols) using end devices with multiple network interface. It’s important to achieve the Always Best Connected (ABC) Concept to offer the best QoS available in the user’s location. The issue of being connected to a network with poor parameters, while another network with better parameters is available arises, thus giving the users multiple options to choose from. To move seamlessly from one network to the other, and without suffering from disconnecting and reconnecting delays, or loss of signal, Vertical Handover has been a proposed in many researches. Vertical Handover can offer the best and most efficient solution to such situation. In this research fuzzy logic method is used to obtain the best suited network to handover to, and marking the results with measuring multiple parameters to ensure the improvement of the situation in each user’s case. The results indicate that the proposed vertical handover achieve an improvement in the parameters of each user’s handover from one network to another network, multiple calculations show that 3G users throughput improves by 277% (triple its value in 3G) if handed over to Wi-Fi, the bandwidth of Wi-Fi users improves by 419% if handed over to WiMAX, WiMAX users throughput improves by 87% if handed over to Wi-Fi, while in LTE the bandwidth can be improved by 422 % if handed over to WiMAX.