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.
