Improved Performance Modeling of Intelligent Safety Message Broadcast in Vanet: A Survey

Intelligent Transportation System involves emergency message exchange between the vehicles to avoid the accidents. In this paper we give a brief overview of ways to improve the performance of safety message delivery in VANET. First we study about the MAC protocols used in VANET for the communication between the vehicles. In the existing system AD-HOC MAC protocol is used that degrades the performance as the node mobility increases. The goal of the paper is to study about Ve-MAC protocol for reliable broadcast of safety message and hybrid communication scheme to enable connectivity under sparse traffic and dense traffic conditions. The paper also studies the impact of hidden terminal problem in VANET.The existing MAC protocols are compared with Ve-MAC that increases performance of safety message broadcast by increasing the reliability and decreasing the delay.