60documents trouvés
Feedback control for router management and TCP/IP networks stability
Y.ARIBA, F.GOUAISBAUT, Y.LABIT
MAC, OLC
Revue Scientifique : IEEE Transactions on Network and Service Management, Vol.6, N°4, pp.255-266, Septembre 2009 , N° 09057
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Mots-Clés / Keywords
Active queue management; Congestion control; Control theory; Multiple time delay system; Stability; TCP/IP;
An augmented model for robust stability analysis of time-varying delay systems
Y.ARIBA, F.GOUAISBAUT
MAC
Revue Scientifique : International Journal of Control, Vol.82, N°9, pp.1616-1626, Septembre 2009, DOI:10.1080/00207170802635476 , N° 09045
Lien : http://hal.archives-ouvertes.fr/hal-00357764/fr/
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Abstract
Stability analysis of linear systems with time-varying delay is inves- tigated. In order to highlight the relations between the variation of the delay and the states, redundant equations are introduced to construct a new modeling of the delay system. New types of Lyapunov Krasovskii functionals are then proposed allowing to reduce the conservatism of the stability criterion. Delay dependent stability conditions are then formu- lated in terms of linear matrix inequalities (LMI). Finally, several exam- ples show the effectiveness of the proposed methodology.
Mots-Clés / Keywords
Time-delay systems stability; Lyapunov-Krasovskii functional; LMI;
Stability analysis of discrete-time systems with uncertain delays: a quadratic separation approach
F.GOUAISBAUT, J.M.GOMES DA SILVA Jr
MAC, UFRGS
Manifestation avec acte : European Control Conference (ECC09), Budapest (Hongrie), 23-27 Août 2009, pp.4175-4180 , N° 09469
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118779Integral quadratic separators for performance analysis
D.PEAUCELLE, L.BAUDOUIN, F.GOUAISBAUT
MAC
Manifestation avec acte : European Control Conference (ECC09), Budapest (Hongrie), 23-26 Août 2009, pp.788-793 , N° 08585
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118778Multiple time-delays system modeling and control for router management
Y.ARIBA, F.GOUAISBAUT, Y.LABIT
MAC, OLC
Manifestation avec acte : European Control Conference (ECC09), Budapest (Hongrie), 23-26 Août 2009, pp.3557-3562 , N° 09043
Lien : http://hal.archives-ouvertes.fr/hal-00357762/fr/
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Abstract
This paper investigates the overload problem of a single congested router in TCP (Transmission Control Protocol) networks. To cope with the congestion phenomenon, we design a feedback control based on a multiple time-delays model of the set TCP/AQM (Active Queue Management ). Indeed, using robust control tools, especially in the quadratic separation framework, the TCP/AQM model is rewritten as an intercon- nected system and a structured state feedback is constructed to stabilize the network variables. Finally, we illustrate the proposed methodology with a numerical example and simulations using NS-2 simulator.
Mots-Clés / Keywords
Time-delay systems control; Congestion control; AQM; TCP networks;
Robust control tools for traffic monitoring in TCP/AQM networks
Y.ARIBA, F.GOUAISBAUT, S.RAHME, Y.LABIT
MAC, OLC
Manifestation avec acte : 3rd IEEE Multi-Conference on Systems and Control (MSC 2009), St Petersbourg (Russie), 8-10 Juillet 2009, pp.525-530 , N° 09042
Lien : http://hal.archives-ouvertes.fr/hal-00357761/fr/
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Abstract
Several studies have considered control theory tools for traffic control in communication networks, as for example the congestion control issue in IP (Internet Protocol) routers. In this paper, we propose to design a linear observer for time-delay systems to address the traffic monitoring issue in TCP/AQM (Transmission Control Protocol/Active Queue Management) networks. Due to several propagation delays and the queueing delay, the set TCP/AQM is modeled as a multiple delayed system of a particular form. Hence, appropriate robust control tools as quadratic separation are adopted to construct a delay dependent observer for TCP flows estimation. Note that, the developed mechanism enables 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 emulation experiment validate the proposed methodology.
Mots-Clés / Keywords
Time delay system; Observers; Network anomaly detection; AQM;
Sliding mode observer for anomaly detection in TCP/AQM networks
S.RAHME, Y.LABIT, F.GOUAISBAUT
OLC, MAC
Manifestation avec acte : 2nd International Conference on Communication Theory, Reliability and Quality of Service (CTRQ 2009), Colmar (France), 20-25 Juillet 2009, pp.113-118 , N° 09141
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118803Congestion control stability of a single router with an active queue management
Y.ARIBA, Y.LABIT, F.GOUAISBAUT
MAC, OLC
Revue Scientifique : International Journal on Advances in Internet Technologies, Vol.2, N°1, pp.58-67, Juin 2009 , N° 09055
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Mots-Clés / Keywords
Active queue management; Congestion control; Control theory; Time delay system; Network;
Delay range stability of distributed time delay systems
F.GOUAISBAUT, Y.ARIBA
MAC
Manifestation avec acte : IFAC Symposium on Robust Control Design (Rocond'09), Haïfa (Israël), 16-18 Juin 2009, 14p. , N° 09044
Lien : http://hal.archives-ouvertes.fr/hal-00357765/fr/
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Abstract
This paper is dedicated to the stability analysis of a class of uncer- tain distributed delay systems. We focus to the case where the kernel can be modelled as a polynomial function. The results are constructed by rewriting the system as an uncertain interconnected model and appropri- ate robust control tools as quadratic separation are then used to address to stability issue. Furthermore, some relations that highlight features of the delayed term are added to the interconnected model leading then to the conservatism reduction. At last, stability conditions are expressed in terms of LMIs which can be solved efficiently. Finally, some numerical examples show the effectiveness the proposed method.
Analyse robuste du modèle LFT de Demeter à l'aide des boîtes à outils RoMulOC et Romuald
D.ARZELIER, A.BORTOTT, F.GOUAISBAUT, D.PEAUCELLE
MAC
Rapport de Contrat : Amélioration de la robustesse et validation SCAO par modélisation LFT et analyse pire cas. R&T R-SO8/TG-0004-008, Avril 2009, 78p. , N° 09295
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