Active congestion control using available bandwidth-based congestion detection

Authors:
A. K. Aggarwal;A. N. Bharadwaj;R. D. Kent
Affiliations:
University of Windsor, Canada;Wayne State University;University of Windsor, Canada
Venue:
ICAI'05/MCBC'05/AMTA'05/MCBE'05 Proceedings of the 6th WSEAS international conference on Automation & information, and 6th WSEAS international conference on mathematics and computers in biology and chemistry, and 6th WSEAS international conference on acoustics and music: theory and applications, and 6th WSEAS international conference on Mathematics and computers in business and economics
Year:
2005

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Abstract

Though the problem of congestion has been studied since the beginning of Internet, it continues to demand attention. This work proposes an Active Congestion control (ACC) scheme based on Available Bandwidth-based Congestion Detection (ABCD), which regulates the traffic according to network conditions. Changes in the available bandwidth can trigger re-adjustment of the flow rate. We have introduced packet size adjustment at the intermediate router in addition to rate control at the sender node, scaled according to the available bandwidth, which is continuously monitored. To verify the improved scheme, we have extended Ted Faber's ACC work [1] in NS-2 simulator. With this simulator, we verify ACC-ABCD's gains such as a reduced number of packet drops and a more stable performance. Our tests prove that the ACC-ABCD technique yields better results as compared to TCP congestion control with or without the cross traffic.