A Novel Adaptive Time Gap Based Congestion Control for Vehicular Ad Hoc Network

Despite the growing rates of vehicles on the roads and transported goods, transportation and traffic should become safer, cleaner and more efficient. Thus to ensure reliable and safe communication architecture within VANET, we propose in this context a cooperative and fully distributed congestion control approach, dedicated to operate within vehicular networks, integrated within the 802.11p underway standard, and based on time gap model. We present in this paper a cooperative and fully distributed congestion control approach, based on time gap, to adaptively control the PSM generation rate. Using the measured time gap of the neighbor vehicles in the same lane, the periodic safety message (PSM) generation rate is controlled in order to reduce the congestion, keeping the safety of the vehicles intact.