Authors : T. Sasikala and S.K. Srivatsa
Abstract: Supporting seamless roaming between heterogeneous wireless networks is one of the key issues in the future mobile communication systems. UMTS and hotspot wireless LAN will complement each other to provide ubiquitous high-speed wireless Internet connectivity to mobile users. In such environment it will be required to support inter technology Handoff of mobile terminals without causing disruptions to their ongoing Internet Session Though there is a handoff technique between wireless LAN and UMTS Networks, this proposal aims to give a smooth optimized handoff between Wirelesses LAN and UMTS network by rectifying the drawbacks (like delay in latency and Packet loss) which is present in the already existing techniques. One problem towards such utilization is the current technological shortcomings of cellular systems that limit the data rate. One way to bypass this limitation is to use Wireless LAN in cooperation with cellular network such as UMTS networks, an increasing number of wireless telecommunication providers are now offering both voice and data services to their users. These services and the emerging multimedia services demand higher data rates to achieve a better Quality of Service (QOS) The implemented algorithm are validated by means of NS2 simulators that clearly show the impact of this technique to major system performance metrics.
T. Sasikala and S.K. Srivatsa , 2006. Optimized Handoff Algorithms for WLAN and UMTS NETWORKS. Asian Journal of Information Technology, 5: 485-490.