Vehicles–to-Infrastructure Communication Safety Messaging in DSRC

Vehicular communications use either the IEEE 802.11a or IEEE 802.11p wireless standard. With the support of the Dedicated Short Range Communications (DSRC), it has its wide range of applications such as energy efficiency, real-time traffic monitoring, infotainment, congestion control, and road safety. The key challenge in Vehicular communications is how to combat with the high mobility of vehicles due to their varying speed, as they communicate with each other via the Access Point (AP). Vehicles moving at high speeds have short opportunity to share data with each other, and this has to be within the shortest time; else there will be collision. In this paper, we proposed an Adaptive-Context-Aware Rate Selection (ACARS) algorithm, and modelled the mobility of vehicles with speed distribution using context-information. From results obtained, it shows that ACARS is efficient and reliable in delivery of safety messages in vehicles. It performs better using a Constant Speed mobility model, in order to obtain good throughput and low delay. Results also show that vehicles can get reliable messaging from each other via the AP.