Supported by the National Natural Science Foundation of China under Grant No.60573001 (国家自然科学基金); the Natural Science Foundation of Chongqing of China under Grant Nos.CSTC2008BB2295, CSTC2008BB2324, CSTC2007BA2017 (重庆市自然科学基金); the Science Research Project of Chongqing Municipal Education of China under Grant No.KJ090611 (重庆市教委科研项目)
As an application of mobile ad hoc networks (MANET) on Intelligent Transportation Information System, the most important goal of vehicular ad hoc networks (VANET) is to reduce the high number of accidents and fatal consequences dramatically. One of the most important factors that would contribute to the realization of this goal is the design of effective broadcast protocols. This paper introduces the characteristics and application fields of VANET briefly. Then, it discusses the characteristics, performance, and application areas with analysis and comparison of various categories of broadcast protocols in VANET. According to the characteristic of VANET and its application requirement, the paper proposes the ideas and breakthrough direction of information broadcast model design of inter-vehicle communication.