Abstract
Vehicular ad hoc network (VANET) is an important component for advancing the intelligent transportation system (ITS) to improve the traffic safety and enrich driving experience. In VANET safety applications, reliable and rapid dissemination of event-driven emergency messages is of great significance to obtain the traffic safety and efficiency. In this paper, we propose a RBEM/CBEM handshake mechanism to enhance the broadcast protocol, which is dedicated to the emergency message broadcast in urban road environment. The reliability of emergency message dissemination can be improved by reducing the packet delivery failures caused by the collisions. We design a process of broadcasting emergency messages through the urban roads, taking into account the road characteristics and scalability requirements. We conduct simulation to confirm the feasibility and effectiveness of the proposed mechanism.
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