Risk Zone Selective Emergency Message Forwarding Scheme For VANETRisk Zone Selective Emergency Message Forwarding Scheme For VANET

Abstract

VANET is one of special kind of mobile ad-hoc network which is specifically designed for ITS environment. VANET communication can be V2V or V2I communication. V2V communication is a communication among moving vehicles and V2I communication is a communication between vehicles with infrastructure. VANET applications can be safety and comfort application. Disseminating safety information in VANET heavily relies on broadcasting schemes. Safety application is time critical which needs low delay and can be disseminated on time, so broadcasting is the best option in safety application for VANET. But when we apply simple broadcasting it causes broadcast storm problem in dense network. Due to this selective forwarding scheme to broadcast emergency message is needed. In highway scenario, there is frequent dis-connectivity of link caused by high speed which leads to network fragmentation problem and there is high overhead caused by redundant data transfer in simple broadcasting approach. The aim of this thesis is to design emergency message dissemination scheme with high data delivery ratio, low overhead and low forwarder node ratio. In this thesis we design multi-hop selective forwarding scheme by using RSU as a forwarder node to solve network fragmentation and we use vehicles which are found only in the risk zone for further forwarding to reduce the unwanted traffic. Algorithms for risk zone identification and forwarder node selection and emergency message dissemination are proposed. To select forwarder node we combine distance, road identifier and travel direction of vehicle. To implement the thesis, we use SUMO simulator for generating mobility and OMNeT++ for network simulator by using Veins framework.