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基于Markov链的车载自组网MAC层建模及分析

, PP. 1304-1310

Keywords: 通信技术,车载自组网,增强型分布信道访问,Markov链,饱和分析模型

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Abstract:

车载自组网底层协议IEEE802.11p的MAC层采用增强型分布信道访问机制(EDCA),为验证该机制能否满足不同类型消息的服务质量,采用二维Markov链建立了该机制的饱和分析模型,模型考虑了不同队列类型、内部碰撞和退避挂起机制。在此基础上,分析了不同队列的归一化吞吐量、丢包率和时延性能指标,同时还研究了退避挂起机制对丢包率的影响。结果表明:随着车辆数的增加,归一化吞吐量逐渐减小,而丢包率和时延逐渐增加;高优先级队列始终有较大归一化吞吐量值、较低丢包率和较小的传输时延。验证了IEEE802.11p能够保证不同类型消息的服务质量,并为车载自组网的部署提供理论依据。

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