Signal transmission control protocol sources with the objective of managing queue utilization and delay is actually a feedback control problem in active queue management (AQM) core routers. This paper extends AQM control design for single network systems to large-scale wired network systems with time delays at each communication channel. A system model consisted of several local networks is fir...

Active Queue Management (AQM) has been extensively studied in the context of wired Internet. In this paper, we propose an AQM algorithm for a bottleneck node with wireless link. Specifically, we propose a robust controller design method that maintains the queue length close to an operating point. We treat capacity variation as an external disturbance and design the controller using H∞ control t...

Active Queue Management (AQM) policies are mechanisms for congestion avoidance, which pro-actively drop packets in order to provide an early congestion notification to the sources. In this paper we propose a new Adaptive Prediction based Approach for Congestion Estimation in Active Queue Management (APACE) that predicts the instantaneous queue length at a future time using adaptive filtering te...

Due to the rapid development in computer networks, congestion becomes a critical issue. Congestion usually occurs when the connection demands on network resources, i.e. buffer spaces, exceed the available ones. We propose in this paper a new discrete-time queueing network analytical model based on dynamic random early drop (DRED) algorithm to control the congestion in early stages. We apply our...

Active queue management (AQM) is a key congestion control scheme for reducing packet loss and improving network utilization in TCP/IP networks. This paper proposes a proportional–integral-derivative (PID) controller as an active queue manager for Internet routers. Due to the limitations of packet-dropping probability and the effects of propagation delays in TCP networks, the TCP AQM network was...

Active Queue Management (AQM) can potentially reduce packet loss rate in the Internet. This is used by routers for control congestion, where packets are dropped before queues become full. In this paper, comparative study has been done using NS2 simulator. By examine five different AQM techniques i.e. RED, RIO, SFB, SRR and BLUE the performance of network has been evaluated on the basis of three...

In this paper, a state feedback H¥ controller is proposed in order to design an active queue management (AQM) system based on congestion control algorithm for networks supporting TCP protocols. In this approach, the available link bandwidth is modeled as a time-variant disturbance. The purpose of this paper is to design a controller which is capable of achieving the queue size and can guarantee...

This paper presents how generalized predictive control can improve the performance of TCP/IP networks when dealing with control congestion. Predictive control and GPC (Generalized Predictive Control), in particular, can be seen as an improved AQM (Active Queue Management) method. Predictive controllers, constrained and unconstrained, are compared with other control methods, such as PI control o...

Congestion in a network may occur when the load on the network is greater than the capacity of the network In this paper we analyzed active queue management algorithms with respect to their abilities of maintaining high resource utilization, identifying and restricting disproportionate bandwidth usage, and their deployment complexity. We compare the performance of RED, REM, and GREEN based on s...

Quality of Service (QoS) Internet routers is still challenged with the issue congestion. Active Queue Management (AQM) algorithms aimed at improving end-to-end delay packets by keeping average queue size small. This objective yet to be fully accomplished, especially for interactive services. In this study, an AQM algorithm named Improved Random Early Detection (IRED) based on popular (RED) pres...