Research On Internet Congestion Control

Due to emergence of many new network applications and rapid expansion of the networked user group, Internet traffic has been increasing dramatically, and network congestion appears to be a more and more critical issue. Congestion control mechanisms are very important in guaranteeing the stability of Internet. Moreover, a suitable congestion control mechanism is the basis for other Quality-of-Service (QoS) mechanisms to work effectively.In this thesis, end-to-end congestion control and IP-layer congestion control mechanisms are reviewed. Current research directions are discussed. Active queue management is the research focus of this thesis. Using network-simulation software (ns-2), several active queue management mechanisms are compared. Based on the comparative analysis and experimental verification, the methods of traffic classification are investigated, and a new active queue management approach is proposed.