• 中国计算机学会会刊
  • 中国科技核心期刊
  • 中文核心期刊

J4 ›› 2011, Vol. 33 ›› Issue (12): 7-11.

• 论文 • 上一篇    下一篇

一种采用价格机制的无线接入网络拥塞控制策略

严黎明,牛玉刚   

  1. (华东理工大学化工过程先进控制和优化技术教育部重点实验室,上海 200237)
  • 收稿日期:2011-07-19 修回日期:2011-09-26 出版日期:2011-12-24 发布日期:2011-12-25
  • 基金资助:

    国家自然科学基金资助项目(61074041);上海市重点学科资助项目(B504)

A Congestion Control Scheme Based on the Price Mechanism  in Wireless Access Networks

YAN Liming,NIU Yugang   

  1. (Key Laboratory of Advanced Control and Optimization for Chemical Processes,
    East China University of Science and Technology,Ministry of Education,Shanghai 200237,China)
  • Received:2011-07-19 Revised:2011-09-26 Online:2011-12-24 Published:2011-12-25

摘要:

由于无线接入网络中存在着时延大、吞吐量小、丢包率高等特性,传统的AQM拥塞机制难以应用于有线/无线异构网络。本文通过分析经典的随机指数标记算法(REM)中价格的产生机制,指出了其存在的不足,并通过引入队列缓存比对REM价格使其更能适应无线环境,从而提出了一种新的基于价格的拥塞控制策略—PREM。PREM利用队列缓存比和链路虚拟容量作为拥塞度量指标。最后,通过NS2仿真平台对所提算法进行了验证,与传统的有线拥塞控制经典算法REM算法、PI算法和无线ProxyRED算法做了对比实验,最后证实该算法能有效减少丢包现象。

关键词: 无线接入网络, 拥塞控制, 主动队列管理, 队列缓存比, 虚拟容量

Abstract:

Due to the wireless access networks’ characteristics of large delay, small throughput and high packet loss rate, the current active queue management (AQM) is not applicable to the wiredcumwireless network. This paper analyzes the price production mechanism of Random Exponential Marking (REM) and points out its shortcomings. By improving the price with queuebuffer proportion, a new pricebased congestion control mechanism (PREM) is proposed. PREM uses queuebuffer proportion and virtual capacity as congestion measures. Finally, the proposed algorithm is validated on the NS2 simulation platform and compared with REM, PI and ProxyRED.It is proved that PREM can reduce the packet loss effectively.

Key words: wireless access network;congestion control;active queue management;queuebuffer proportion;virtual capacity