In VANETs, the TDMA-based MAC protocol has been demonstrated as a promising solution to well support delay-sensitive and road-safety applications, since the time-slotted channel management can guarantee a medium access with determined delay. However, due to the varying vehicular mobilities, existing TDMA-based MAC protocols can result in collisions of time slot assignment when multiple sets of vehicles merge together. To avoid slot-assignment collisions, in this chapter, with considering the vehicular mobilities, we propose a mobility-aware TDMA-based MAC, named MoMAC, which can assign every vehicle a time slot according to the underlying road topology and lane distribution on roads. In MoMAC, different lanes on the same road segment and different road segments at intersections are associated with disjoint time slot sets. In addition, each vehicle broadcasts beacon application data together with the time slot occupying information of neighboring vehicles. By updating the time slot occupying information of two-hop neighbors (obtained indirectly from one-hop neighbors), vehicles can detect time slot collisions and access a vacant time slot in a fully distributed way. We demonstrate the efficiency of MoMAC with both theoretical analysis and extensive simulations. Compared with state-of-the-art TDMA-based MACs, the transmission collisions can be reduced by 59.2% when adopting our proposed MoMAC, and the rate of safety message transmissions/receptions can be significantly enhanced.
Mobility-Aware and Collision-Avoidance MAC Design
Wireless Networks
07.08.2020
28 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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