Active Queue Management for networks

What is it about?

This paper presents an internal model control robust queue management scheme with two degrees of freedom in order to restrict the undesired effects of large and small round trip time and parameter variations in the queue management. Conventional approaches such as proportional integral and random early detection procedures lead to unstable behaviour due to large delay. Moreover, internal model control–Smith scheme suffers from large oscillations due to the large round trip time. On the other hand, other schemes such as internal model control–proportional integral and derivative show excessive sluggish performance for small round trip time values. To overcome these shortcomings, we introduce a system entailing two individual controllers for queue management and disturbance rejection, simultaneously.

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Why is it important?

The main contribution of this paper is to introduce a stabilizing controller which is robust against external disturbances such as the variations of the number of users or TCP sessions and also with the authority to tolerate both small and large RTT delays with the advantage of no approximation for the delay term.

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