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车辆网络MAC层的Markov链综合分析模型

DOI: 10.13190/j.jbupt.2014.01.009, PP. 39-42

Keywords: IEEE,802.11p,增强型分布信道接入,Markov链,建模与分析

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Abstract:

应用于车载自组网的IEEE802.11p媒体接入控制(MAC)层采用增强型分布信道接入机制,为验证该机制能否满足不同类型消息的服务质量(QoS),在考虑不同竞争窗口值、消息内部碰撞和信道忙时的退避挂起机制的基础上,构建了基于二维Markov链的分析模型,该模型综合了饱和情况和非饱和情况.通过该模型,分析了不同类型队列消息的归一化吞吐量和丢包率性能指标.结果表明,归一化吞吐量随车辆数的增加而减小,随不同类型数据包产生量的增加而增加;丢包率随车辆数的增加而增加;高优先级队列始终有较大归一化吞吐量值.验证了IEEE802.11p能保证不同类型消息的QoS.

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