Early Handoff mechanism for integrating VANET into Hybrid Wireless Network

Hybrid Wireless Network is the integration of more than one type of networks to utilize their benefits and optimize the performance. Vehicular Ad-hoc Networks are the highly dynamic wireless networks formed by vehicles equipped with onboard communication interface. It is difficult to achieve ubiquity in the presence of different types of networks. The proposed mechanism aims to attain ubiquity in Hybrid Wireless Networks by reducing the handoff latency during the handoff procedure and the presence of vehicular nodes removes the power constraint on mobile nodes. The concept of Preferred Access Points has been introduced to achieve fast handoff by using the Early Handoff mechanism. In addition, the mechanism makes use of the knowledge of the network known to access points and GPS (already installed in vehicular nodes) and makes the handoff procedure seamless. The proposed scheme is simulated on the open source simulator OMNeT++ and the delay in registration process of the handoff procedure is the basis for performance evaluation.