Comparison of PI controllers designed for the delay model of TCP/AQM networks
Author
Ünal H. U.
Melchor-Aguilar, D.
Üstebay, D.
Niculescu, S. -I.
Özbay, Hitay
Date
2013Source Title
Computer Communications
Print ISSN
0140-3664
Publisher
Elsevier
Volume
36
Issue
10-11
Pages
1225 - 1234
Language
English
Type
ArticleItem Usage Stats
129
views
views
128
downloads
downloads
Abstract
One of the major problems of communication networks is congestion. In order to address this problem in TCP/IP networks, Active Queue Management (AQM) scheme is recommended. AQM aims to minimize the congestion by regulating the average queue size at the routers. To improve upon AQM, recently, several feedback control approaches were proposed. Among these approaches, PI controllers are gaining attention because of their simplicity and ease of implementation. In this paper, by utilizing the fluid-flow model of TCP networks, we study the PI controllers designed for TCP/AQM. We compare these controllers by first analyzing their robustness and fragility. Then, we implement these controllers in ns-2 platform and conduct simulation experiments to compare their performances in terms of queue length. Taken together, our results provide a guideline for choosing a PI controller for AQM given specific performance requirements.
Keywords
Active Queue ManagementDelay systems
Network congestion
PI Controller
TCP/IP
Active Queue Management
Delay systems
Network congestions
PI Controller
TCP/IP
Controllers
Internet protocols
Queueing networks