An Emergency Message Dissemination Protocol Using Greedy Forwarding Technique and Clustering for VANETS

Abstract

Vehicular Ad hoc Networks (VANET) is oriented to vehicular communication also regarded as one specific application of Mobile Ad hoc Networks. The prospect of its applications in intelligent transportation and entertainment services is optimistic. While the mature routing protocols of MANET is not suitable for VANET because of its different features. Therefore, its significant to develop special routing protocols for VANET according to its features. In this thesis research is carried out on GPSR (Greedy Perimeter Stateless Routing for Wireless Networks) protocol. Analyze its functionality and point out its defects in different environments. Then put forward an improved GPSR protocol based on position vector aiming at some defects . Based on the comprehensive understanding of the routing mechanism, study the suggested solution for each of its defects. Based on the position vector calculation and simple redundancy elimination, GPSR protocol is modified. A preliminary assumption is taken into consideration for retrograde motion. NS2 (Network Simulator version2) has been used for simulation purpose. Comparative analysis of proposed work has been done with the original protocol and its performance is quite better. We want to carried out simulation for VANET in the computerised world i.e. we should do a computerized simulations. However, they may cause risk and sometimes may be danger free, we can provide or can generate the different scenario (rural, urban, collision of vehicles) of the VANET using this technique. So computerized simulation is also very important in VANET research. Simulation of VANET is broken into two part first is-Traffic simulation: Generates traffic movement. It define the mobility model for vehicles and also creating traffic movements. Secound is: Network simulation. It generates Inter communicating vehicle, Defining communication protocols. Both the simulation are connected in bi-directional coupling.