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Several studies have considered control theory tools for traffic control incommunication networks, as for example the congestion control issue in IP(Internet Protocol) routers. In this paper, we propose to design a linearobserver for time-delay systems to address the traffic monitoring issue inTCP/AQM (Transmission Control Protocol/Active Queue Management) networks. Dueto several propagation delays and the queueing delay, the set TCP/AQM ismodeled as a multiple delayed system of a particular form. Hence, appropriaterobust control tools as quadratic separation are adopted to construct a delaydependent observer for TCP flows estimation. Note that, the developed mechanismenables also the anomaly detection issue for a class of DoS (Denial of Service)attacks. At last, simulations via the network simulator NS-2 and an emulationexperiment validate the proposed methodology.

Robust control tools for traffic monitoring in TCP/AQM networks