Design of proportional-derivative-type state feedback controllers for congestion control of transmission control protocol networks

Abstract

A new proportional-derivative-type state feedback controller is proposed for congestion control of transmission control protocol (TCP) networks. An analytical TCP model is adopted. In the proposed control scheme, it is possible to efficiently control the TCP traffic using only the queue length at the router without the need to know the TCP window size which is not available locally. The results are presented in terms of delay-dependent linear matrix inequality. The proposed method is verified by simulation examples using NS software, and the effectiveness and superiority of our method over other control schemes, such as the proportional-integral, random early detection and generalised minimum variancemethods, are also shown.

Keywords:

• networked control
• state-space models
• linear matrix inequalities
• communications networks

Additional information

Funding

This work has been funded by the Iran Telecommunication Research Centre (ITRC) [grant number T/500/6972].

Notes on contributors

Masoumeh Azadegan

Masoumeh Azadegan received her BSc degree in control engineering from the K.N. Toosi University of Technology in 2007 and her MEng degree from the Tarbiat Modares University, Tehran, Iran, in control engineering in 2010. She is currently pursuing her PhD degree in control engineering from the Tarbiat Modares University. Her research interests include teleoperation, networked control systems, time-delayed systems and Markovian jump systems.

Mohammad T.H. Beheshti

Mohammad T.H. Beheshti was born in 1956 in Tehran, Iran. He received his BS degree in electrical engineering from the University of Nebraska at Lincoln in 1984, and his MS and PhD degrees in control engineering from the Wichita State University, Wichita, Kansas, in 1987 and 1992, respectively. Dr Beheshti served as a faculty member of the electrical engineering department, Malek Ashtar University of Technology, Isfahan, Iran, from 1992 to 1994. Since 1995 he has been working as an associate professor of the electrical and computer engineering department, Tarbiat Modares University, Tehran, Iran. Dr Beheshti's research interests include modelling and control of singular perturbation systems, modelling and control of communication and computer networks and congestion control.

Babak Tavassoli

Babak Tavassoli is currently working as an assistant professor with the Faculty of Electrical and Computer Engineering at the K.N. Toosi University of Technology, Tehran, Iran. He received his BS degree in electronics engineering in 1998 from the University of Tehran, Tehran, Iran. He received his MS and PhD degrees in control engineering from the same university in 2001 and 2009, respectively. He has published several papers and has also reviewed a number of papers for international journals and IEEE conferences. Currently, his research is mainly focused on control and automation over communication networks and multivariable process modelling and control.