Performance of a Stable Unit Active Queue Management

The purpose of this research is to design a new queue management algorithm effectively controlling for all kinds of traffics. Among active queue managements (AQM), Random Early Detection (RED), has been widely used to improve the TCP throughput. AQM such as the RED can sustain the small delay and jitter performance, even if RED generates the retransmission packets. In this paper, we proposed the Stable time RED (ST-RED) to improve the delay and jitter performance without degradation of throughput and good putt performances. ST-RED enables to stabilize the calculation timing for average queue length leading to suppress the queue fluctuations. We also implemented the ST-RED mechanism on the ns-2 simulator. As the results of simulation, we extracted the following features. Firstly, RED improves the delay performance without the degradation of throughput and good put performances for all different alphas of the Pareto distribution. Secondly, ST-RED with 0.5 msec time interval improves the delay and jitter performances compared to the RED.