  In the recent years Vehicular Ad hoc Networks (VANET) became one of the most
challenging research area in the field of Mobile Ad hoc Networks (MANET).
Vehicles in VANET send emergency and safety periodic messages through one
control channel having a limited bandwidth, which causes a growing collision to
the channel especially in dense traffic situations. In this paper a protocol
Particle swarm optimization Beacon Power Control (PBPC) is proposed, which
makes dynamic transmission power control to adjust the transmission power of
the safety periodic messages that have been aggressively sent by all vehicles
on the road 10 times per a second, the proposed protocol aims to decrease the
packet collision resulted from periodic safety messages, which leads to control
the load on the channel while ensuring a high probability of message reception
within the safety distance of the sender vehicle.
