動態(tài)權重RED網關
A Dynamic-Weight RED Gateway
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摘要: 隨著網絡流量的增加,擁塞控制的重要性日益突出，尤其是鏈路擁塞控制。IETF推薦RED(Random Early Detection)作為下一代Internet路由器的擁塞控制算法。該文在分析了RED的優(yōu)點和缺點后，在現(xiàn)在RED算法的基礎上通過改進RED算法的平均隊列長度計算，使用平均隊列長度的均值，判斷擁塞的發(fā)生和結束，動態(tài)調整權重，提高RED對擁塞發(fā)生和擁塞結束的反應速度，縮短擁塞時間，維持較低的實際隊列長度。最后用仿真驗證了該方法。
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關鍵詞:
- RED; 動態(tài)調整; 擁塞控制
Abstract: The congestion control mechanisms used in Internet have been the focus of numerous studies and have undergone a number of enhancements. However, even with these enhancements, TCP connections still experience alarmingly high loss rates, especially during times of congestion. The IETF has addressed this problem by advocating the deployment of active queue management mechanisms, such as RED, in the network, But RED have some problems, for example the average queue length changing slowly when congestion starting and ending. To alleviate this problem, a Dynamic-Weight RED(DWRED) is proposed which can quickly be conscious of the congestion and dynamic adjust the weight. DWRED use the average queue length to estimate the change of the queue and adjust the weight to alleviate the congestion and drop when the congestion is over. The time of congestion is shorter than the RED. The result is proved by the simulation. -
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