| IEEE 802. 11无线局域网中基于最优窗口的退避算法 |
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| 引用本文： | 廖盛斌,朱晓亮. IEEE 802. 11无线局域网中基于最优窗口的退避算法[J]. 计算机科学, 2012, 39(1): 82-84 |
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| 作者姓名： | 廖盛斌 朱晓亮 |
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| 作者单位： | 1. 华中师范大学国家数字化学习工程研究中心 武汉430079;华中科技大学电信系 武汉430074
2. 华中师范大学国家数字化学习工程研究中心 武汉430079 |
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| 基金项目： | 国家自然科学基金，武汉市科技攻关计划项目，中央高校自主科研项目 |
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| 摘 要： | 首先通过把资源分配看成效用最大化的优化模型，说明在IEEE 802. 11无线局域网中各个节点争用信道的退避窗口应当一样，然后通过最小化节点间的冲突概率，得出节点个数与最优退避窗口之间的关系，由此提出一种基于最优共享退避窗口的重传算法。由于各个节点的退避窗口一样，算法有效地解决了I3EI3(I3inary Exponential Back-off)算法的不公平性问题;并且退避窗口根据网络的状况置，吞吐量也得到了较大的提高。仿真试验验证了算法的有效性。
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| 关 键 词： | 效用，资源分配，最优化，退避算法，公平性，无线局域网 |
Optimal Window Based Backoff Algorithm for IEEE 802. 1 1 WLANs |
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| LIAO Sheng-bin , ZHU Xiao-liang. Optimal Window Based Backoff Algorithm for IEEE 802. 1 1 WLANs[J]. Computer Science, 2012, 39(1): 82-84 |
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| Authors: | LIAO Sheng-bin ZHU Xiao-liang |
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| Affiliation: | 1 (National Engineering and Research Center for e-learning,Huazhong Normal University,Wuhan 430079,China)1(Department of Electronics and Information Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)2 |
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| Abstract: | That every node should have the same value of contention window(CW) was first vertisified in a WLAN by formulating resource allocation as a utility maximization optimal problem,then the relation between the optimal value of CWand the number of nodes was obtained by maximizing the total network utility with constrains of minimizing collision probability.A new retransmission algorithm was proposed which uses an optimal shared CW.Due to the same CW,the proposed algorithm can effectively overcome the unfairness of BEB algorithm and and improve throughput.Simulation results validate our conclusion. |
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| Keywords: | Utility Resource allocation Optimization I3ackoff algorithm Fairness WLANs |
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