CRM - Mitigating Flooding in VANET through Controlled Rebroadcasting Mechanism

Abstract

The Vehicular Adhoc Network (VANET) is realizing Intelligent Transportation System. VANET performs essential functions in road safety, accident detection and congestion reduction by enabling vehicles to broadcast messages. In case of emergency, vehicles broadcast an alert message to its neighbors and receives an alert message from its neighbors, causing an increase in the number of rebroadcasted messages and lead to flooding. The flooding will result in higher bandwidth utilization, drop of packets etc. and handling this flooding situation is an open issue. Thus, this paper proposes a novel technique for controlling the rebroadcasting of emergency messages to reduce the number of broadcasted or rebroadcasted messages in the VANET. Unlike the traditional rebroadcasting method, multipath nature of signal propagation inherent in the urban environment was taken into account. This method implies reducing the number of rebroadcasting messages to the minimum possible, but sufficient number for information coverage of the required area. The simulation of the proposed method assessed both qualitatively and quantitatively. It works better than most of the proposed current techniques.