Using input delay approach for synthesizing an anti-windup compensator to AQM in TCP/IP networks

Lamrabet, Ouarda; Fezazi, Nabil El; Haoussi, Fatima El; Tissir, El Houssaine

doi:10.1109/atsip.2017.8075573

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…Then, AQM arose as an effective way to tune TCP behavior, by discarding selectively packets to smoothly regulate the traffic rate and delay variation, called jitter, which threatens nowadays the multimedia network services (Abharian et al 2012;Dahmouni et al 2012;El Fezazi et al 2019a). AQM mechanisms are introduced to assist the TCP/IP congestion control for its relation with Internet traffic congestion and Quality of Service (QoS) demands of users and applications (Alaoui et al 2018(Alaoui et al , 2019Bigdeli and Haeri 2007;Lamrabet et al 2017). These techniques can be categorized in various groups such as heuristic methods that are mainly developed by computer scientists and mathematical schemes such as game theory-based algorithms and control theorybased approaches (see the works Xu et al 2015;Wang et al 2017;Zhou et al 2013;Zhu et al 2016 for details).…”

Section: Introductionmentioning

confidence: 99%

“…Since the control actions in AQM are the discarding probabilities (real numbers bounded between [0, 1]), the AQM approaches that ignore the input saturation are not adequate because saturations might deteriorate the control system's performance and frequently lead to unacceptable losses of stability. Then, to mitigate the saturation effects on stability of such systems, local/global stabilization in a specified region of attraction (Cao et al 2002;El Fezazi et al 2017, 2019cEl Fezazi 2019;Naamane et al 2017) and anti-windup techniques where the emphasis is on the transient performance caused by the saturations (Bender 2013(Bender , 2014Lamrabet et al 2017Lamrabet et al , 2018 is studied. The drawback of some proposed approaches is the computing resources demanded to implement them in a real network, which may yield it unfeasible.…”

Section: Introductionmentioning

confidence: 99%

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AQM Congestion Controller for TCP/IP Networks: Multiclass Traffic

Fezazi

Elfakir

Bender

et al. 2020

J Control Autom Electr Syst

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Active queue management (AQM) is a congestion control mechanism for the early notification of the incipient congestion pursued by dropping/marking packets. The novelty in our result is that we are able to consider heterogeneous traffic (i.e., multiclass traffic) where each class has its own packet discarding policy, queue size, and bandwidth share. Then, this is so far the first control theory-based approach for the AQM problem on the TCP/IP routers that allows multiclass AQM. Our proposed technique assumes that each class has already a controller, designed a priori, and focuses on designing a static state feedback controller where the proposed design approach is based on the solution of linear matrix inequalities (LMIs). From the theoretical conditions, a new controller design methodology for discrete time systems with multi-delays, saturated inputs, and disturbances is proposed to overcome the obstacle of bilinearity which leads to a quite simple LMI condition that is numerically tractable with any convex optimization algorithm. A numerical example is provided at the end of this paper to show the effectiveness and performances of the proposed approach in the presence of multiclass traffic.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AQM Congestion Controller for TCP/IP Networks: Multiclass Traffic

Fezazi

Elfakir

Bender

et al. 2020

J Control Autom Electr Syst

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“…In this sense, active queue management (AQM) arose as an effective way to smoothly regulate the traffic rate and delay variation, the so‐called jitter, which threaten multimedia and on demand network services: for this, AQM adapts TCP by selectively discarding packets. Thus, these AQM mechanisms assist the TCP/IP congestion control reducing internet traffic congestion and improving the Quality of Service (QoS) demands of users and applications . According to Bigdeli and Haeri, these techniques can be categorized in various groups such as heuristic methods, that are mainly developed by computer scientists; mathematical schemes, such as game theory‐based algorithms, and control theory‐based approaches (see the work of Domańska et al for details).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, these AQM mechanisms assist the TCP/IP congestion control reducing internet traffic congestion and improving the Quality of Service (QoS) demands of users and applications. 2,3 According to Bigdeli and Haeri, 4 these techniques can be categorized in various groups such as heuristic methods, that are mainly developed by computer scientists; mathematical schemes, such as game theory-based algorithms, and control theory-based approaches (see the work of Domańska et al 5 for details). This paper focuses on control theory-based techniques, that are based on the model proposed in the work of Misra et al 6 : the most resounding so far is the proportional integral (PI) controller proposed in the work of Hollot et al 7 Numerous techniques have been proposed in the literature (see, for example, other works 4,[8][9][10][11] and references therein).…”

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confidence: 99%

Multiclass AQM on a TCP/IP router: A control theory approach

Fezazi

Haoussi

Tissir

et al. 2019

Intl J Robust & Nonlinear

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Summary Active queue management (AQM) is a well‐known technique to improve routing performance under congested traffic conditions. It is often deployed to regulate queue sizes, thus aiming for constant transmission delay. This work addresses AQM using an approach based on control theory ideas. Compared with previous results in the literature, the novelty is the consideration of heterogeneous traffic, ie, multiclass traffic. Thus, each traffic class may have different discarding policies, queue sizes, and bandwidth share. This feature brings the proposal nearer to real network management demands than previous approaches in the literature. The proposed technique assumes that each class already has a simple controller, designed a priori, and focuses on designing a static state‐feedback controller for the multiclass system, where the design is based on using LMIs for the calculations. For this, optimization problems with LMI constraints are proposed to compute the state‐feedback gains that ensure stability for a large set of admissible initial conditions. These conditions ensure not only closed‐loop stability but also some level of performance. As far as we know, this is the first control theory based approach for the AQM problem on TCP/IP routers that allows a multiclass AQM while also considering time‐varying delays and input saturation. This is an important step to frame AQM in a more formal, yet realistic context, enabling it to address important service level agreement (SLA) directives. The proposal is tested on a simulated system at the end of this paper, showing the feasibility and performance of the approach in the presence of multiclass traffic.

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“…In [15], the authors addressed the problem of anti-windup design for sampled data with time delay and input saturation. The input delay approach was used to develop an anti-windup compensator for Active Queue Management (AQM) in Transmission Control Protocol/Internet Protocol (TCP/IP) networks in [16]. Some efforts were devoted to the problem of delta operator systems under input limitations; see for example [17,18].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Delta Operator Systems with Actuator Saturation via an Anti-Windup Compensator

2019

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The design of an anti-windup controller for delta operator systems with time-varying delay and actuator saturation is addressed. By utilizing the input-output approach and three-term approximation, we first transform the original system into two equivalent interconnected subsystems. Then, by employing the scaled small-gain theorem, the Lyapunov–Krasovskii functional, and Wirtinger’s integral inequality, sufficient conditions for the synthesis of an anti-windup compensator are presented in the form of linear matrix inequalities (LMIs). The estimated domain of attraction is maximized by an optimization algorithm. Numerical examples are studied to show the merits of the proposed technique.

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Using input delay approach for synthesizing an anti-windup compensator to AQM in TCP/IP networks

Cited by 18 publications

References 12 publications

AQM Congestion Controller for TCP/IP Networks: Multiclass Traffic

AQM Congestion Controller for TCP/IP Networks: Multiclass Traffic

Multiclass AQM on a TCP/IP router: A control theory approach

Stabilization of Delta Operator Systems with Actuator Saturation via an Anti-Windup Compensator

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