Fixed and adaptive model-based controllers for active queue management

Author

Chait, Yossi ; Hollot, C.V. ; Misra, Vishal ; Oldak, Salomon ; Towsley, Don ; Wei-Bo Gong

Author_Institution

Massachusetts Univ., Amherst, MA, USA

Volume

4

fYear

2001

fDate

2001

Firstpage

2981

Abstract

In this paper we present new model-based controllers for active queue management (AQM) supporting TCP flows. Our control design is based on linearization of a previously developed TCP model using fluid flow and stochastic differential equations. An AQM using a simple PI controller is shown to significantly outperform RED AQM. However, we show that both AQMs are unable to maintain performance as the number of flows increases. To overcome this, we introduce a special type of adaptation, the externally excited adaptive loop (EEAL) controller. In comparison to the PI AQM, the EEAL AQM exhibits faster response to flow changes, and is able to give a dynamic estimate of the number of flows

Keywords

adaptive control; controllers; queueing theory; stochastic processes; transport protocols; two-term control; EEAL AQM; PI controller; TCP flows; active queue management; adaptive model-based controllers; externally excited adaptive loop; fixed model-based controllers; fluid flow; performance; stochastic differential equations; Adaptive control; Control systems; Delay; Fluid flow; Fluid flow control; Open loop systems; Pi control; Programmable control; Stability; Stochastic processes;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 2001. Proceedings of the 2001

Conference_Location

Arlington, VA

ISSN

0743-1619

Print_ISBN

0-7803-6495-3

Type

conf

DOI

10.1109/ACC.2001.946368

Filename

946368