Active Queue Management(AQM) is an effective method to improve the performance of end-to-end congestion control. PI controller is a popular AQM scheme having good steady-state properties. We present the guidelines for setting parameters of PI controller using the “second-order optimization model” instead of the margin of stability to improve transient behavior. The performance of PI controller with new parameters is verified and compared with that of default ns parameters using ns simulations. The results show that the dynamic behavior of PI controller is improved. We present several future directions in the end.