Enhancement of QoS of VOIP over Heterogeneous Networks by Improving Handoff Speed and Throughput

The increasing demand for broadband services is causing the cellular network providers to consider for the integration of Wireless LAN with GPRS. WLAN is having higher data rate but low coverage area but GPRS is having lower data rate but with high coverage area. So integrating these two heterogeneous networks will lead to utilization of advantages of both and can increase the system throughput. The handoff latency is reduced by considering the threshold values of both the networks and anticipating the handoff well before. Especially the packet loss is completely eradicated by multicasting the packets during the handoff period and switch back to normal mode after the handoff. Hence the system throughput obviously increase by certain amount by our procedure of multicasting.