Active queue management controller design for TCP communication networks: Variable structure control approach

• Published in: Chaos, solitons and fractals Vol. 40; no. 1; pp. 277 - 285
• Main Authors: Chen, Chang-Kuo, Liao, Teh-Lu, Yan, Jun-Juh
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.04.2009
• ISSN: 0960-0779; 1873-2887
• DOI: 10.1016/j.chaos.2007.07.064

On the basis of variable structure control (VSC), an active queue management (AQM) controller is presented for a class of TCP communication networks. In the TCP/IP networks, the packet drop probability is limited between 0 and 1. Therefore, we modeled TCP/AQM as a rate-based non-linear system with a saturated input. The objective of the VSC-based AQM controller is to achieve the desired queue size and to guarantee the asymptotic stability of the closed-loop TCP non-linear system with saturated input. The performance and effectiveness of the proposed control law are then validated for different network scenarios through numerical simulations in both MATLAB and Network Simulator-2 (NS-2). Both sets of simulation results have confirmed that the proposed scheme outperforms other AQM schemes.