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Congestion Control of TCP-Westwood Using AQM-PI Controller

Author(s): Amirhossein Abolmasoumi | Saleh Sayyad Delshad | Mohammadtaghi Hamidi Beheshti

Journal: International Journal of Computer Networks & Communications
ISSN 0975-2293

Volume: 3;
Issue: 2;
Start page: 180;
Date: 2011;
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Keywords: Congestion control | PI-AQM | TCP Westwood | PI controller | Self-tuning PI | RED

This paper concerns TCP Westwood (TCPW), a recently developed modification of TCP, in combinationwith random early detection (RED), PI and self-tuning PI queue management. Using the fluid-flow modelof TCPW and separating the model dynamics through block diagram simplification, it is arrived at anapproximate and simplified new model. Based on this approximate model, a PI-AQM (Active QueueManagement) controller is designed. The parameters of considered PI controller are tuned throughestimating the network parameters. Numerical simulations show that bandwidth utilization and the queuestabilization in the self-tuning PI is improved as compared with the PI and RED algorithms.
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