Robust controller design for congestion control in TCP/IP Routers

Fezazi, Nabil El; Lamrabet, Ouarda; Haoussi, Fatima El; Tissir, El Houssaine; Álvarez, Teresa; Tadeo, Fernando

doi:10.1109/icosc.2016.7507049

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…The impact of PID parameters selection and traffic self-similarity degree on the behavior of queue length were proved. A memoryless ' H∞' controller was designed in 2016 for TCP/ IP routers [11] . The controller designed to be robust for time-variant networks to keep stability and performance of network in a critical situation, using "standard linear matrix inequality techniques".…”

Section: Related Workmentioning

confidence: 99%

Fuzzy Set-Point Weight for PID Controller Based on Antlion Optimizer to Congestion Avoidance in TCP/AQM Routers

Abdulkareem

Awad²

2020

Iraqi Journal of ICT

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The delay in delivering packets and packets loss in computer networks is due to the problem of congestion in TCP/AQM routers, and to solve this crisis the TCP and AQM worked together. Where TCP provides secure data transfer and designed to handle congestion after its occurrence. While AQM predicts congestion and tries to resolve the problem before it occurs. In this work, the Fuzzy-PID (FPID) controller presented to manage the avoidance of congestion problems associated with TCP networks. The approach is based on hybridization between the Fuzzy Logic Controller (FLC) and the Proportional-Integral-Derivative(PID) controller, with the structure of Fuzzy-Set-Point-Wight(FSW) for PID controller that optimized by Antlion Optimizer(ALO) Using a linearized TCP congestion model. our target is to control the queue length of the router for the queue level in demand. The FPID controller shows good robustness for a Different scenario of the TCP network and the queue length response showed fast tracking capability with good robustness to network parameters changing in comparison to PID controller, all simulations are carried out using MATLAB 2017b.

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Section: Related Workmentioning

confidence: 99%

Fuzzy Set-Point Weight for PID Controller Based on Antlion Optimizer to Congestion Avoidance in TCP/AQM Routers

Abdulkareem

Awad²

2020

Iraqi Journal of ICT

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“…The controller has been designed with the explicit objective of queue control, so some simulation results are presented in Figure 3 using the algorithm (25) to show the performance of the queue control. These simulations explore the regulation of the router queue around a specific predetermined length (given that a multitraffic approach is considered, we cannot make a fair comparison with single-traffic approaches).…”

Section: Examplementioning

confidence: 99%

“…Since the control actions in AQM are the discarding probabilities, AQM approaches that ignore the input saturation are not adequate because saturations are known to deteriorate performance and might lead to unacceptable losses of stability. In order to mitigate the saturation effect on the stability of such systems, local/global stabilization in a specified domain of attraction has been studied previously, [12][13][14][15][16][17][18][19][20][21][22] and antiwindup techniques have been proposed in other works [23][24][25][26][27][28] where the emphasis was on the transient performance caused by the saturation. In this sense, the aforementioned works [23][24][25][26] proposed delay dependent antiwindup techniques to ensure the closed-loop stability of TCP/IP AQM routers.…”

mentioning

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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“…tere@autom.uva.es be noted that these works neglect the system discretizing which is very important to study the real system. Thus, we extend the output dynamic used in [9] and [10] to this work. The dynamics of this controller has been chosen so that the closed loop system is stable.…”

Section: Introductionmentioning

confidence: 99%

“…Since the control action in AQM is determining the discarting probability, which is clearly a real number bounded between [0, 1], you cannot have a realistic AQM that disregards input saturation. In order to mitigate the saturation effect on stability of systems, an anti-windup synthesis for state-delayed systems has been addressed in [5], [7], [8], [9], [10], [16], [19]. It must elhaous fati@yahoo.fr 3 Valladolid University, Department of Systems Engineering and Automation, 47005, Valladolid, Spain.…”

Section: Introductionmentioning

confidence: 99%

A dynamic anti-windup AQM for congestion control in internet

Fezazi

Alaoui

Haoussi

et al. 2016

2016 IEEE/ACS 13th International Conference of Computer Systems and Applications (AICCSA)

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Abstract-This paper addresses the design of anti-windup gains for obtaining stability for linear systems with discrete time varying delay and saturating inputs delay. Considering that a dynamic output feedback has been designed to stabilize the AQM system (without saturation), a method is proposed for designing an anti-windup gain which relates the saturation of the queue when congestion, which is inevitable in networks. It is shown that the closed-loop system obtained from the controller plus the anti-windup gain can be modeled by a linear system with a dead zone nonlinearity. A modified sector condition is then used to obtain stability conditions based on Lyapunov functions. Differently from previous works these conditions are directly in linear matrix inequality form. Resulting in a new AQM which will be simulated in MATLAB and compared to RED.

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Robust controller design for congestion control in TCP/IP Routers

Cited by 10 publications

References 13 publications

Fuzzy Set-Point Weight for PID Controller Based on Antlion Optimizer to Congestion Avoidance in TCP/AQM Routers

Fuzzy Set-Point Weight for PID Controller Based on Antlion Optimizer to Congestion Avoidance in TCP/AQM Routers

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

A dynamic anti-windup AQM for congestion control in internet

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