Active Queue Management for Congestion Control: Performance Evaluation, New Approach, and Comparative Study

Abstract

Network congestion is one of the most important problems that effect Quality of Service (QoS). Several Active Queue Management (AQM) algorithms have been developed to avoid congestion problem by controlling the queue length in routers. However, an important problem arising with the current AQM algorithms is that most of the current algorithms handle different traffics by the same strategy. This problem may lead to performance degradation especially for real-time applications ssuch as video and audio traffics. This paper first presents a performance evaluation of the current AQM algorithms. It then presents a new AQM algorithm, called Dynamic Queue RED (DQRED), to guarantee efficient QoS to both real-time and non-real-time traffics. Finally, a comparative study is done between the proposed DQRED algorithm and the most recent AQM algorithms by using the network simulator (NS-2) considering different QoS metrics.