An efficient MAC protocol for provisioning fairness in vehicle to roadside communications

Md. Abu Bakar Siddik, Shafika Showkat Moni, M. S. Alam
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引用次数: 5

Abstract

In this paper, we present an efficient medium access control (MAC) protocol based on IEEE 802.11 DCF, which minimizes the unfairness problem of two way vehicle ad hoc networks. Geographically highly dynamic topology in vehicle ad hoc networks lead to unfairness problem. Unfairness problem has two aspects: higher velocity vehicles cannot transmit a minimum number of packets and lower velocity vehicles cannot transmit above a minimum number of packets. To address the above mentioned issues, our proposed scheme adjusts the transmission probability for each vehicle according to its residence time by changing the value of MAC parameters dynamically. An analytical model is developed to analyze the performance of the proposed protocol in a non-saturated state. We derive the relationship between the transmission probability and the residence time. Furthermore, relation between the transmission probability and the minimum contention window size of a vehicle is also derived to correlated residence time with minimum contention window size. Analytical results show that our proposed scheme overcomes the limitations of existing MAC protocols by ensuring that packet transmission rate remains proportional to the residence time of the vehicles.
一种有效的MAC协议,为车辆到路边的通信提供公平性
本文提出了一种基于IEEE 802.11 DCF的高效介质访问控制(MAC)协议,最大限度地解决了双向车辆自组织网络的不公平性问题。车辆自组织网络中地理高度动态的拓扑结构导致了不公平问题。不公平问题主要表现在两个方面:高速车辆无法达到最小数据包数,低速车辆无法达到最小数据包数以上。为了解决上述问题,我们提出的方案通过动态改变MAC参数的值,根据每辆车的停留时间来调整其传输概率。建立了一个分析模型来分析该协议在非饱和状态下的性能。导出了传输概率与停留时间之间的关系。此外,还推导出了传输概率与车辆最小竞争窗口大小之间的关系,即停留时间与最小竞争窗口大小之间的关系。分析结果表明,我们提出的方案克服了现有MAC协议的局限性,保证了数据包传输速率与车辆停留时间成正比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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