Optimal Network Selection from Heterogeneous Radio Networks

Abstract

Fourth generation (4G) wireless networks are expected to support mechanisms for tight integration and cooperation of divergent access network technologies. Radio network selection is the mechanism which decides how to select the most suitable RAT based on the discovered accesses, QoS constraints, operator policies, user preferences and available system capacity and utilization. In such networks of heterogeneous nature, roaming users will experience frequent handovers across network boundaries and also the user who wants to request for services. Thus, optimizing the selection process is an important issue of research to select the best network, ensure seamless roaming and efficient resource usage over dissimilar networks, so intelligent algorithms need to be used extensively. This thesis presents a vertical handover decision (VHD) scheme for optimizing the efficiency of vertical handover processes in the Fourth Generation (4G) heterogeneous wireless networks where increase the throughput and the data rate for the user. Tow networks are considered, LTE and WiMax. The handover between them will execute according to the RSS, bandwidth and SNR, this compare to the handover according to the RSS only. The results show that the throughput and the data rate increase when we use additional parameters to the RSS.