A Move toward Fast and Consistent Broadcast of Safety Messages in VANETs

Vehicular AdhocNETworks (VANETs) relies on continuous data exchange among vehicles and vehicles to roadside units (RSU) to aid road safety, route planning, etc. A transition from free flow to congested traffic on highways often spontaneously originates, despite the fact that the road could satisfy a higher traffic demand. The reasons for such a traffic breakdown are perturbations caused by human drivers in dense traffic. To deal with this constraint, the paper provides a three stage congestion control algorithm as follow; priority assignment to the safety messages broadcasted depending upon the path followed by the vehicle transmitting that particular message, congestion recognition stage, and ultimately beacons transmission rate adjustment. The simulation results (done with ns-2) clearly depict that as soon as congestion is detected; applying beacon rate adjustment algorithm improves the system performance.