New Class-based Dynamic Scheduling Strategy for Self-Management of Packets at the Internet Routers

Recently, the Internet became the most important environment for many activities including sending emails, browsing web sites, making phone calls and even having a videoconference for far education. The incremental growth of the internet traffic leads to a serious problem called congestion. Several Active Queue Management (AQM) algorithms have been implemented at the internet routers to avoid congestion before happening and solve the congestion if it happens by actively controlling the average queue length in the routers. However, most of the developed algorithms handle all the traffics by the same strategy although the internet traffics, real time and non-real time; require different Quality of Service (QoS). This paper presents a new RED-based algorithm, called Dynamic Queue RED (DQRED), to guarantee the required QoS of different traffics. In the proposed algorithm, three queues are used in the internet router; one queue for each traffic type (data, audio and video). The arrived packets are first queued in the corresponding queue. The queued packets are then scheduled dynamically according to the load (the number of queued packets) of each class type. This strategy guarantees QoS for real time applications as well as service fairness.