Street Broadcast with Smart Relay for Emergency Messages in VANET

Vehicular Ad Hoc Network (VANET) is an emerging new technology and a promising platform for the Intelligent Transportation System (ITS). The most important application of VANET is disseminating emergency messages to warn drivers in case of dangerous events. The core technique relies on the design of a broadcast scheme. In this paper, we propose a street-based broadcast scheme that is suitable for urban environments and has an efficient performance on delivery ratio and rebroadcast overhead. To make our scheme better suited in a sparse environment with low density of traffic, the smart relay mechanism was proposed. We show the superiority of our proposed scheme over other ones in a simulated environment that models real streets and vehicle movements.