An Efficient Emergency Message Dissemination in a Vehicular Ad Hoc Network
Zouina Doukha, Samira Moussaoui, Noureddine Haouari, Mohamed E.A. Delhoum
Journal of E-Technology, Vol. 3, No. 2, 2012.
DOI: 
Link: http://www.dline.info/jet/fulltext/v3n2/5.pdf
Abstract:
VANET has become an attractive domain of research because it has tremendous potential to improve safety and comfort on roads. One key usage of VANET is to support vehicle safety applications like dissemination of emergency messages. Due to inherent characteristics of vehicular ad hoc networks and the emergency of the messages, most of developed applications are based on multi hop broadcasting. The most basic strategy is called flooding. This strategy is well studied in the context of mobile ad hoc networks and has been shown it causes contentions, collisions and redundancy, well known as the â€˜broadcast storm problemâ€™. The majority of existing solutions focuses on decreasing the number of relay nodes and discards the use of unicast messages. In this paper we study a new strategy that combines the use of unicast and broadcast modes at the same time. Simulation results show that the proposed protocol achieves low latency in delivering emergency warnings in spite of the use of unicast messages. These results have been enhanced by modifying the MAC layer protocol parameters.