SIP-based vertical handover scheme with bicasting

Due the complexity of the wireless environments, single technology cannot be efficient to provide demands of mobile users. Hence, in cooperation with heterogeneous wireless technologies, the next generation of wireless systems makes it possible to communicate everywhere. Providing high performance and data rate is what this cooperation has promised to meet. So issues related to the heterogeneity of wireless environment like handover should be addressed. With the appearance of overlapping wireless networks, MNs have to switch their connections between different access technologies having different capabilities and characteristics. In this case, the handover process is more complex and is known as Vertical Handover. In this paper, we focus on the vertical handover management and use an extension of SIP to support vertical handover with bicasting. Delay reduction and SIP signaling messages overhead reduction are the challenges we have tried to improve with our proposed method. To evaluate our proposed method, we use the OPNET Modeler 14.5 and it´s Performance for real-time service besides examining the VoIP. Simulation has been performed on UMTS/WLAN networks. The results show that our technique can improve latency and throughput.