In the context of the DiffServ architecture, active queue management (AQM) algorithms are used for the differentiated forwarding of packets. However, correctly setting the parameters of an AQM algorithm may prove difficult and error-prone. Besides, many studies have shown that the performance of AQM mechanisms is very sensitive to network conditions. In this paper we present an adaptive AQM alg...

Current active queue management (AQM) and TCP protocol are designed and tuned to work well on wired networks where packet loss is mainly due to network congestion. In wireless networks, however, communication links suffer from significant transmission bit errors and handoff failures. As a result, the performance of TCP flows is significantly degraded. To mitigate this problem, we analyze existi...

In this paper, we apply an anti-windup scheme for improving the performance of a conventional ProportionalIntegral (PI) controller for Active Queue Management (AQM) supporting TCP flows. When a PI controller is used for AQM, the “windup” phenomenon of the integral action can cause performance degradation because the packet drop probability is limited between 0 and 1. Therefore we model TCP/AQM ...

In this paper, a Scalable Proportional Integral (SPI) active queue management (AQM) algorithm for High Speed TCP (HSTCP) is proposed. Based on the linearization model for HSTCP, we give a stability analysis for the closed loop interconnection systems (HSTCP and SPI AQM). Then, an adaptive parameters setting method for SPI AQM is presented. Using ns2 simulation, we illustrate that SPI shows sati...

We discuss the implementation of an off-line air quality model (AQM). More precisely, how to design a code for an AQM that runs efficiently on a variety of computer platforms. We implemented our ideas in an AQM benchmark and we show the performance of this benchmark on the different architectural paradigms. A second subject of the paper is the I/O performance of the Cray T3E for an off-line mod...

In the current Internet, long-term TCP flows and bursty shortterm flows both exist. The mix between the aggregated longterm TCP traffic (responsive traffic) and the bursty traffic (non-responsive traffic) has great impact on the performance of Active Queue Management (AQM) algorithms in routers. We introduce a new solution to differentiate between responsive and unresponsive traffic in AQM queu...

In order to establish a unified spatial reference for the whole ship, inertial matching measurement of hull deformation is widely used because its continuity and concealment. However, vibration-shock signal shipborne equipment often brings short-time output disturbance user-side fibre gyroscope unit (FGU), will bring great challenges accuracy convergence measurement. To solve these problems, au...

In the paper, a new framework of active queue management, namely, edge-based active queue management (EAQM), is proposed. Conventional AQM schemes are required to be deployed at all routers in the network, and this involves significant upgrading to current drop-tail routers. The new approach only needs to modify the edge routers and at the same time provides similar or better performance as com...

Explosive growth of applications for wireless networks and increasing number of users will cause significant increase in the traffic over radio channels. Consequently, uplink and downlink channels may suffer serious traffic congestion problems in the absence of effective congestion control schemes. One approach to enhance the performance of wireless services is to employ an AQM scheme for buffe...

This paper presents a Particle Swarm Optimization (PSO) method for determining the optimal parameters of a first-order controller for TCP/AQM system. The model TCP/AQM is described by a second-order system with time delay. First, the analytical approach, based on the D-decomposition method and Lemma of Kharitonov, is used to determine the stabilizing regions of a firstorder controller. Second, ...