Information retrieval in two-tier VANET/P2P using RSU as a superpeer

Since traffic is increasing considerably day by day so information exchange for vehicular environment is very important to increase safety and to provide proper guidance of road side services available to driver during journey. Because of increased attraction towards Intelligent Transportation System (ITS) services it is required to design a system which can retrieve information very efficiently. A two-tier VANET/P2P system is basically the integration of two different type of services which are used for information exchange. Low-tier vehicular Ad-hoc networks (VANETs) can be used for achieving low lookup latency whereas high-tier infrastructure based Peer-to-Peer (P2P) can be used for increasing lookup success rate. In proposed protocol distance based reachability has been used. Reachability reduces lookup latency while maintaining moderate lookup success rate. Parameters for proposed adaptive lookup two-tier mechanism have been compared with the conventional two-tier lookup mechanism using Network Simulator (NS2.34).