RF-RED:一种速率公平的RED改进算法

RF-RED:improved RED algorithm based on rate fairness

为了提高响应流和非响应流之间的公平性,提出了一种基于速率公平的RED改进算法——RF-RED(ratefairness random early detection).该算法在路由器端计算UDP流的平均速率并与TCP友好流速率进行比较,根据比较结果动态调整UDP流和TCP流的最大丢包率,最后使用RED算法分别更新UDP流和TCP流的实际丢包率.通过使用RF-RED算法,UDP流在瓶颈链路上成为TCP友好流,同时瓶颈带宽得到了公平利用.仿真结果验证了该算法的有效性.

In order to improve the fairness between responsive streams and unresponsive streams, an improved random early detection （RED） mechanism based on rate fairness, which is named rate fairness random early detection （RF-RED）, was proposed. The RF-RED algorithm calculates the average rate of user datagram protocol （UDP） streams on the router and compares it with the TCP-friendly rate, then adjusts the maximum drop rate of transmission control protocol （TCP） stream and UDP stream according to the above result, at last updates the instantaneous drop rate of TCP stream and UDP stream with the RED algorithm. Using RF-RED algorithms, UDP stream is turned into TCP-friendly stream on the bottleneck link and the fairness of bottleneck bandwidth usage of TCP and UDP stream can be improved. The simulation results verified the effectiveness of RF-RED.