VeMAC: A TDMA-Based MAC Protocol for Reliable Broadcast in VANETs

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The need of a Medium Access Control (MAC) protocol for an efficient broadcast service is of great importance to support the high priority safety applications in Vehicular Ad hoc NETworks (VANETs). This paper introduces VeMAC, a novel multichannel TDMA MAC protocol proposed specifically for a VANET scenario. The VeMAC supports efficient one-hop and multi-hop broadcast services on the control channel by using implicit acknowledgments and eliminating the hidden terminal problem. The protocol reduces transmission collisions due to node mobility on the control channel by assigning disjoint sets of time slots to vehicles moving in opposite directions and to road side units.