Abstract
The important goal in designing the Medium Access Control (MAC) layer in Vehicular Ad hoc Networks (VANETs) is to provide reliable safety message broadcast and efficient non-safety message transmissions to vehicles. This paper proposes the Directional Multi-channel MAC protocol for VANETs, named DMV protocol, which provides safety message broadcast reliability and high service channel utilization. Both TDMA and CSMA access schemes are supported, and directional antennas are employed in the DMV protocol. The simulation results show that DMV outperforms IEEE 1609.4 in terms of packet delivery ratio of safety messages and throughput of non-safety messages at the price of complex data structures.
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