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Internet congestion existing solutions such as active queue management algorithms have many shortcomings, mainly related to the detection phase. These algorithms depend on routers' buffer statistics to detect congestion and their performance is highly affected by the environment and the parameters that are used. In this paper we are proposing a mechanism that is capable of detecting congestions by...
Active queue management (AQM) plays a significant role in network congestion. A new adaptive PID controller for AQM is presented to overcome the shortcomings of PID AQM such as parameters cannot be adjusted with time, cannot be adapted to the dynamic and nonlinear network. The new algorithm integrates PID control law and neural network, which not only has the merits of both but also overcomes the...
In this paper, we present the Fair Early Drop (FED) scheme which aims to prevent the unfairness problem generated by unresponsive flows and treat the various kinds of transport traffic “fairly”. Unresponsive flows are managed by making sure they do not consume more than their fair share of network resources; that is, by dropping more packets from them. The dropping decision is simple with O(1) complexity...
Active Queue Management (AQM) algorithms have been proposed to address performance degradations of end-to -end congestion control. However, these AQM algorithms present weaknesses for stabilizing delays in heavy loaded networks. In this paper, we describe a novel T-S fuzzy control algorithm to improve best effort TCP/IP Networks performance. In TCP networks, the packet-dropping probability function...
In recent years, traffic monitoring and especially anomaly estimation have constituted an open problem in the network community. This paper proposes to design an observer-based sliding mode control for time delay systems representing TCP fluid flow model. The main advantage of the sliding observer lies in estimating, in a finite time, system states while exhibiting fundamental robustness against perturbation...
In grid computing, most of the SLA management systems focus on static SLAs, where the guarantee terms are defined as constants or bounds. None of them support dynamic SLAs based on analytical expressions. Therefore, to enforce dynamic SLAs and to improve services offered to applications, we propose a new monitoring method to control the resource utilization and to reconfigure them when necessary in...
Nowadays congestion control problem of the intermediate nodes in the Internet has received extensively attention in networking and control community. In this paper, a novel adaptive PID (Proportional-Integral-Differential) controller based on neural networks for the problem of AQM with ECN marks is presented. Considering a previously developed nonlinear dynamic model of TCP/AQM system and the queue...
In high-speed networks supported by TCP/IP, congestion control algorithm plays an important role. Real time streaming media, such as video, audio conversations and movies on line, often are transmitted over the Internet. The dominant paradigm for congestion control in the Internet is based on the TCP friendliness. As the load on the network increases, it is critical to find the point at which congestion...
In this paper, we introduce an active queue management (AQM) scheme based on variable structure control (VSC) algorithm in order to solve the problem of congestion control in the Internet. A robust variable structure controller is proposed for the robust stabilization of linear input delay network systems with uncertainties. Moreover, we design a sliding surface to minimize the effect of the input...
Congestion occurs when resource demands exceeds the capacity. At this moment, congestion are solved by the involvement of two controlling mechanism, they are flow control in the TCP source and active queue management (AQM) in the link. AQM will provide feedback to the source a kind of indication for the occurrence of the congestion in the link, whereas the source will adapt the sending rate appropriate...
In this paper we consider the design of control strategies for implementation in a recently proposed active queue management (AQM) scheme, active drop-tail (ADT) (Stanojevic et al., 2006), The basic idea underlying ADT is to adjust the queue length of a drop-tail buffer to regulate the utilization of a link carrying Internet traffic in order to reduce queuing delays in the network. A basic problem...
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