A New AQM Scheme for Fast Response

Based on control theory, a Proportional-Integral (PI) controller is designed which has a character of fast response. Consequently, a new Active Queue Management (AQM) scheme called Active PI algorithm (A-PI) is proposed, which employed double sets of parameters applying one set of parameters for fast response and the other for achieving queues stability. A-PI controller uses threshold to shift parameter smoothly, and it can be implemented easily. Analysis and simulation results show that under various network conditions A-PI controller has a fast response and a good performance in stability.