Abstract
Collision is the main problem in Vehicular network, which badly affect network throughput and time delay. To tackle this, this paper proposes a Collision-Predicted TDMA MAC (CPTM) protocol in the centralized vehicular network which includes a Road Side Unit (RSU). The main idea is that the RSU first predicts the merging collisions in the upcoming slots, and then adjusts appropriately the time slots allocation for vehicles to prevent the collisions. In order to decrease the possibility of access collision, empty time slots list is provided by RSU for new vehicles in RSU region. What's more, RSU reassigns time slots for different-direction vehicles according to vehicle density ratio on roads, which can improve the utilization of channels. We evaluate the proposed protocol with extensive simulations. Simulation results show that comparing with the existing MAC protocols, CPTM can achieve higher throughput and lower time delay.
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