Abstract: This paper analyzed and studied the internal structure of the adaptive RED algorithm through time-domain analysis using the classic control theory, which is based on AQM. According to the analyzing results,the paper designed a new discrete controller based on 2nd-order difference ectuation and applied it to the AQM algorithm. To illustrate the performance of the given algorithm,the paper simulated the prompted algorithm on NS-2 platform. Numerical simulation results show that the 2nd-order difference ARED algorithm can keep the queue length much more stable and has better control capability for the queue length.

Key words: 2nd-order difference ARED, Active queue management, Queue length