计算机工程 ›› 2010, Vol. 36 ›› Issue (06): 108-110.doi: 10.3969/j.issn.1000-3428.2010.06.036

• 网络与通信 • 上一篇    下一篇

一种新的噪音信道接入控制机制

王明超,白光伟,徐 颖   

  1. (南京工业大学计算机科学与技术系,南京 210009)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-03-20 发布日期:2010-03-20

Novel Access Control Mechanism for Noisy Channel

WANG Ming-chao, BAI Guang-wei, XU Ying   

  1. (Department of Computer Science and Technology, Nanjing University of Technology, Nanjing 210009)
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-03-20 Published:2010-03-20

摘要: 为提高IEEE802.11 DCF在噪音信道中的性能,在DCFf机制的基础上,通过改进网络规模调整参数q的算法,提出基于网络规模的信道接入机制SDCFf,建立其Markov链模型,模型中考虑了传输误码对协议的影响。应用数据成功发送概率和饱和吞吐量等指标衡量SDCFf的性能,根据网络规模和信道状态,以q值动态调整竞争窗口的加倍和重置,使无线局域网的性能达到最优。实验结果表明,当网络规模发生变化时,SDCFf的性能明显优于DCFf。

关键词: 分布式协调功能, 噪音信道, 成功发送概率, 饱和吞吐量

Abstract: In order to improve the performance of 802.11 DCF in noisy channel, by improving the probability of q of the network size, this paper proposes a novel channel access control mechanism for IEEE802.11 WLAN named SDCFf(network Scale-based DCF in fading channel), and constructs its Markov chain model. The performance of SDCFf is evaluated with the successful transmission probability and the saturation throughput. According to the network size and channel conditions, the probability of the parameter p is adjusted via either doubling or resetting the contention windows dynamically to optimize the performance of WLAN. Experimental result shows that, when the network size changes, SDCFf performs much better than DCFf does.

Key words: Distributed Coordination Function(DCF), noisy channel, successful transmission probability, saturation throughput

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