Fast broadcast at the intersection in VANET

Vehicular Ad-hoc Network(VANET) enables a wireless communication between vehicles to improve driver's safety. For the safety, a message including safety-related information is broadcast between vehicles and forwarded for farther vehicles. VANET poses challenges that broadcast attempts from many vehicles cause collisions between packets and result in packet drops. Many researches have concentrated on removing collisions in those excessive broadcasts. These approaches lead one vehicle to be selected as a rebroadcast vehicle. However, it makes difficult to forward the safety message to all directions at intersections. In this paper, we suggest an efficient way to broadcast a safety message to all directions at an intersection with a short delay and without a collision. Our simulation results show a coverage improvement of as much as 70% and a delay reduction of as much as 100msec.