Simulation and Implementation of Adaptive Fuzzy PID

With the exponential growth of the Internet traffic, congestion problems become severe. To solve these severe problems, the Internet Engineering Task Force (IETF) recommends implementing the Active Queue Management (AQM) mechanism on the Internet routers. This paper introduces a robust AQM algorithm, called Adaptive Fuzzy Proportional Integral Derivative (AF-PID), which adaptively tunes the parameters to overcome the sensitivity of parameters settings for dynamic Internet environments. It's more important that we have operated comparison experiments between Droptail, RED, PID and AF-PID algorithm under seven different scenarios by NS2 simulation software. The experimental results definitely proved the performance of the AF-PID algorithm is of great superiority. Furthermore, we have built up a network test bed with IPCOP as the router successfully, and embedded with the AF-PID algorithm, which once again proved that AF-PID algorithm is not only easy to implement on real network, but also consistent with the simulation results under the same scenario.