This paper addresses the problem of the stability of congestion control for networks with large round-trip communication delays.Nearly all the existing AQM schemes neglect the impact on system behavior

such as stability

robustness and convergence

caused by large communication delay.The drastic queue oscillations in large delay networks of PI

REM and DC-AQM decrease the link utilization and introduce the avoidable delay jitter.To address this problem

we develop a robust IMC-PID congestion controller based on internal model control principle to restrict the negative impact on the stability caused by the large delay.Simulation results demonstrate that the integrated performance of proposed scheme outperforms others as communication delay increases

and achieves high link utilization and small delay jitter.