Fuzzy utility decisional vertical handover algorithm for enhancing network performances

In this paper, we propose a vertical handover decision algorithm. This algorithm executes the vertical handover based on several network criteria like the network delay, the available bandwidth, the received signal strength, etc. Fuzzy logic system was used to implement the handover initiation module while utility function was chosen for the network selection module. We compare our proposed algorithm to the RSS-based algorithm and we provide an evaluation of its performances for different type of traffics: VoIP, video and data. The performance criteria adopted are the throughput, the packet loss ratio and the end-to-end delay. Fuzzy logic MATLAB was used for the implementation of the proposed fuzzy module. Simulations were carried out using NS-2.29 simulator with NIST add on module.