一种EDCA机制分析模型

严军荣; 张顺颐; 龙华; 孙雁飞

doi:10.3724/SP.J.1146.2006.01422

一种EDCA机制分析模型

doi: 10.3724/SP.J.1146.2006.01422

严军荣^{①;张顺颐},
张顺颐,
龙华,
孙雁飞

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出版历程
- 收稿日期: 2006-09-20
- 修回日期: 2007-03-23
- 刊出日期: 2008-04-19

An Analytical Model for EDCA Mechanism

摘要

摘要: 由于IEEE 802.11e 协议的EDCA(Enhanced Distributed Channel Access)机制采用优先级分类和两级冲突，对其建模分析具有相当大的难度。该文根据EDCA机制的特点提出一种简单有效的两级冲突综合模型。利用简单EDCA模型推导出的时隙发送概率公式分别计算内部虚拟冲突和外部冲突概率，将这两种冲突概率进行综合，最终仿真出饱和条件下复杂EDCA模型的吞吐率和时延。仿真结果显示：EDCA机制采用优先级分类和两级冲突，不仅可以优先保证音频和视频业务的吞吐率，而且可以大大降低系统的平均时延。
- 无线局域网; 802．11e; 服务质量; EDCA
Abstract: Priority classification and two-level collision being adopted, Enhanced Distributed Channel Access (EDCA)mechanism of IEEE 802.11e protocol is quite difficult to be modeled and analyzed. According to the characteristics of EDCA mechanism, an effective and simple model for two-level collision is proposed. The probabilities of inner virtual collision and outer collision are calculated based on the formula of sending probability deduced from simple EDCA model, and then integrated. Finally, the simulation of throughput and delay of complicated EDCA under saturation is conducted. The simulation demonstrates that EDCA mechanism, which adopts priority classification and two-level collision, can not only preferentially guarantee the throughput of voice and video, but also greatly decrease the average delay of the system.

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