Title :
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
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;
Conference_Titel :
Performance, Computing, and Communications, 2004 IEEE International Conference on
Print_ISBN :
0-7803-8396-6
DOI :
10.1109/PCCC.2004.1395074
