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A collision-predicted TDMA MAC protocol in centralized vehicular network

机译：集中式车载网络中的冲突预测TDMA MAC协议

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摘要

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.
机译：冲突是车载网络的主要问题，严重影响网络的吞吐量和时延。为了解决这个问题，本文提出了一种在包含路边单元（RSU）的集中式车辆网络中的碰撞预测TDMA MAC（CPTM）协议。主要思想是RSU首先预测即将到来的时隙中的合并冲突，然后适当地调整车辆的时隙分配以防止冲突。为了减少访问冲突的可能性，RSU为RSU地区中的新车辆提供了空时隙列表。此外，RSU根据道路上的车辆密度比率为不同方向的车辆重新分配时隙，这可以提高通道的利用率。我们通过广泛的仿真评估提出的协议。仿真结果表明，与现有的MAC协议相比，CPTM可以实现更高的吞吐量和更低的时延。

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