A robust PI controller for improving performance in the AF-based differentiated services network

Author

Chang, Xiaolin ; Muppala, Jogesh K.

Author_Institution

Dept. of Comput. Sci., Hong Kong Univ. of Sci. & Technol., Kowloon, China

fYear

2004

fDate

2004

Firstpage

487

Lastpage

494

Abstract

The assured forwarding (AF) based service in a differentiated services (Diffserv) network fails to provide bandwidth assurance to aggregates in some circumstances. Several intelligent marking mechanisms have been proposed in the literature to improve bandwidth assurance for aggregates using the knowledge gathered at the ingress nodes. In this paper, we apply a control theoretic approach to this problem. We design a nonlinear proportional-integral (NPI) controller, called NPI-ACT, for adapting the CIR threshold. Performance results using extensive simulations demonstrate significant improvement using NPI-ACT in achieving bandwidth assurance over a wide range of network conditions compared to earlier mechanisms proposed in the literature.

Keywords

PI control; adaptive control; control system synthesis; nonlinear control systems; robust control; telecommunication control; telecommunication networks; telecommunication services; AF-based differentiated services network; PI controller; assured forwarding; bandwidth assurance; committed information rate threshold; control theoretic approach; ingress nodes; intelligent marking mechanisms; local knowledge; nonlinear proportional-integral controller; Aggregates; Bandwidth; Computer science; Diffserv networks; Information rates; Intelligent networks; Performance gain; Pi control; Proportional control; Robust control;

fLanguage

English

Publisher

ieee

Conference_Titel

Performance, Computing, and Communications, 2004 IEEE International Conference on

Print_ISBN

0-7803-8396-6

Type

conf

DOI

10.1109/PCCC.2004.1395074

Filename

1395074