Achieving a reliable V-2-V communication for safety messages

VANETs (Vehicular Ad-hoc Networks) safety applications use broadcasting to disseminate the critical safety-related messages among dynamic multi-hop vehicular networks. The flooding (blind broadcasting) method poses several technical challenges like packet redundancy, contention and collision problems. However, VANETs face different challenges in different environments. There are different techniques that have been proposed to address the challenges of broadcasting safety messages in VANETs in order to provide reliable and scalable communication to enhance application benefits. This paper provides a review of related techniques for V2V communication of safety messages from two perspectives: first the solutions to VANETs challenges in general, and second the techniques for specific environments (highway, urban or rural areas). At the end of this paper a novel approach towards solving broadcast storm problem will be discussed.