The VeMAC Protocol

This chapter presents VeMAC, a novel multichannel TDMA protocol developed specifically for a VANET scenario [1, 2, 3]. The VeMAC supports an efficient one-hop broadcast services on the CCH, by using implicit acknowledgments and eliminating the hidden terminal problem, in order to successfully deliver both periodic and event-driven safety messages in VANETs. 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. Analysis and simulation results in highway and city scenarios are presented to evaluate the performance of VeMAC and compare it with ADHOC MAC [4]. It is shown that, due to its ability to reduce the rate of transmission collisions, the VeMAC protocol can provide considerably higher throughput on the CCH than ADHOC MAC.

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