Improved congestion control with hybrid RED

The paper address issues relating to the choice of queue length indication parameter for packet marking/dropping decsions in RED type algorithms under varying traffic conditions. Modifications to RED are proposed by the use of both instantaneous queue size and its EWMA for packet marking/dropping and reducing the effect of EWMA value when queue size is less then min(th) for a certain number of consecutive packet arrivals. Thus new guidelines for better marking/dropping and faster response of RED type algorithms are derived. The resulting new hybrid algorithm is tested using ns simulations under different scenarios and it is found to give better utilization of network bandwidth and a lower packet loss rate.