Improved congestion control with hybrid RED

The issues relating to the choice of queue length indication parameter for packet marking/dropping decisions in random early detection (RED) type algorithm under varying traffic conditions are addressed. Modifications to RED are proposed by the use of both instantaneous queue size and its EWMA for packet marking/dropping and reducing the effort of EWMA value when queue size is less, then min_th for a certain number of consecutive number of 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.