论文标题
多个访问类别对IEEE 802.11p的MAC层性能的影响
The Effect of Multiple Access Categories on the MAC Layer Performance of IEEE 802.11p
论文作者
论文摘要
增强的分布式通道访问（EDCA）机制使IEEE 802.11p通过四个访问类别（ACS）来适应车辆到车辆（V2V）通信的差异服务质量（QOS）水平。本文介绍了基于多维离散时间马尔可夫链（DTMC）模型，以研究ACS对中型访问控制（MAC）802.11p的中型访问控制（MAC）层性能的平行操作的影响。总体模型由四个及其各自的流量生成器的队列模型组成，它们与DTMC适当地链接了每个AC的操作。获得了模型的稳态概率的封闭式解决方案，然后将其用于得出MAC层处的关键性能指标的表达式。提出了公路方案的应用程序，以了解性能的见解。结果表明，性能如何根据AC的优先级水平在AC中的变化，并强调了所有四个AC的平行操作的分析建模的重要性。
The enhanced distributed channel access (EDCA) mechanism enables IEEE 802.11p to accommodate differential quality of service (QoS) levels in vehicle-to-vehicle (V2V) communications, through four access categories (ACs). This paper presents multi-dimensional discrete-time Markov chain (DTMC) based model to study the effect of parallel operation of the ACs on the medium access control (MAC) layer performance of ITS-G5 IEEE 802.11p. The overall model consists of four queue models with their respective traffic generators, which are appropriately linked with the DTMCs modeling the operation of each AC. Closed-form solutions for the steady-state probabilities of the models are obtained, which are then utilized to derive expressions for key performance indicators at the MAC layer. An application for a highway scenario is presented to draw insights on the performance. The results show how the performance measures vary among ACs according to their priority levels, and emphasize the importance of analytical modeling of the parallel operation of all four ACs.
