Performance modeling of the IEEE 802.11p EDCA mechanism for VANET
Performance modeling of the IEEE 802.11p EDCA mechanism for VANET
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DOI：
10.1109/glocom.2014.7036784
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Qiong Wu;Jun Zheng
中科院分区：
文献类型：
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作者：
Qiong Wu;Jun Zheng
本文建立了一个用于分析IEEE 802.11p EDCA机制访问性能的分析模型。首先构造了一个二维马尔可夫链来描述交流队列的退避过程，并建立了交流队列的传输概率与碰撞概率之间的关系。然后构造一维无限离散马尔可夫链来描述交流队列的争用周期，建立交流队列的传输概率与碰撞概率之间的另一种关系。这两种马尔可夫模型考虑了饱和条件、标准参数、后退反冻结和内部碰撞。在这两条马尔可夫链的基础上，进一步推导了交流队列参数与交流队列访问性能之间的解析模型，分别用传输概率和碰撞概率表示。仿真结果验证了分析模型的有效性。
This paper develops an analytical model for analyzing the access performance of the IEEE 802.11p EDCA mechanism. A 2-D Markov chain is first constructed to describe the backoff procedure of an AC queue and establish a relationship between the transmission probability and collision probability of the AC queue. Then a 1-D infinite discrete-time Markov chain is constructed to describe the contention period of an AC queue and establish another relationship between the transmission probability and collision probability of the AC queue. The two Markov models take into account the saturation condition, standard parameters, backoff counter freezing, and internal collision. Based on the two Markov chains, an analytical model is further derived to describe the relationship between the parameters of an AC queue and the access performance of the AC queue in terms of the transmission probability and the collision probability, respectively. The effectiveness of the analytical model is verified through simulation results.