| 新的改进IEEE 802.11 DCF性能的退避机制 |
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| 引用本文： | 李喆,曹秀英.新的改进IEEE 802.11 DCF性能的退避机制[J].通信技术,2010,43(8):46-47,50. |
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| 作者姓名： | 李喆 曹秀英 |
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| 作者单位： | 东南大学信息科学与工程学院,江苏,南京,210096 |
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| 摘 要： | 分布式协调功能DCF是IEEE802.11标准最基本的媒体接入方法,它的核心是载波检测多址接入/冲突避免（CSMA/CA）机制,通过退避算法,减少碰撞的概率。提出了一种新的退避机制改进IEEE802.11DCF饱和吞吐量性能,建立了三维马尔可夫链网络模型详细研究分析,同时利用NS2对所提出的机制进行仿真,比较了改进后的802.11DCF饱和吞吐量与原802.11DCF的饱和吞吐量的大小,仿真结果证明了算法的准确有效。
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| 关 键 词： | 退避机制 饱和吞吐量 三维马尔可夫链 |
A Novel Backoff Scheme for Improving the Performance of IEEE 802. 11 DCF |
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| LI Zhe,CAO Xiu-ying.A Novel Backoff Scheme for Improving the Performance of IEEE 802. 11 DCF[J].Communications Technology,2010,43(8):46-47,50. |
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| Authors: | LI Zhe CAO Xiu-ying |
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| Affiliation: | (School of Information Science and Engineering, Southeast University, Nanjing Jiangsu 210096, China) |
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| Abstract: | Distributed coordinating function is the most basic media access method of IEEE 802.11 standard, and its core is carrier sense multiple access/conflict avoid mechanism, which could reduce collisions with the backoff algorithm. A novel backoff scheme is proposed to improve the saturated throughput of IEEE 802.11 DCF. A 3-dimensional Markov chain model is introduced to analyze its performance in detail, and the proposed scheme is simulated with NS-2. The modufied 802.11 DCF and the 802.11 DCF are compared in saturated throughput. The simulation results indicate that the algorithm is accurate and effective. |
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| Keywords: | backoff scheme saturated throughput 3-dimensional Markov chain |
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