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The AQM (Active Queue Management) Algorithm such as RED, PI, REM have too long respond time and some other problems. Though it makes some enhancement, the PID (Proportional Integral Differential) active queue management algorithm can not make the queue length converge to expectation with longer delay. Because of self-adapt control of BP (back-propagation) neural network, this issue bring forward a...
In this paper the bifurcation and chaos behavior of a fluid flow model of Internet congestion control system including TCP and AQM is investigated. These bifurcation and chaotic behavior may cause heavy oscillation of average queue length and induce network instability. An impulsive control method was proposed for controlling bifurcations and chaos in the Internet congestion control system. Simulation...
In this paper the bifurcation behavior of a TCP fluid model of Internet congestion control system is investigated. The parameter condition that the Hopf bifurcation occurs is deduced. The sufficient condition under which an impulsive system is asymptotically stable is present. An impulsive controller is proposed for controlling bifurcation in this system. Simulation results demonstrate that the complex...
Recently time-delayed dual model has attracted great attention in studying Internet congestion control. Stability analysis of time-delayed dual model is an important task, where how to determine its solution is the first step. Usually perturbation method can be used to seek the solution of the model, however, its effectiveness depends on a small parameter and it will be invalid when such a parameter...
Background traffic has a significant impact on the behavior of network services and protocols. However, a detailed model of the background traffic can be extremely time consuming in simulation. In this paper, we extend our previous hybrid model that combines fluid and packet-oriented characterization of network traffic for a realistic representation of the background traffic on Internet. In particular,...
Peer-to-peer (P2P) live video streaming systems have recently received significant attention, with commercial deployment gaining increased popularity in the Internet. It is evident from our experiences with real-world systems that, it is not uncommon to have hundreds of thousands of users trying to join a program in the first few minutes of a live broadcast. This phenomenon, unique in live streaming...
This paper presents a method of GPS differential positioning based on pseudorange. Both the generation and encoding of differential data based on pseudorange and differential data transmission protocol based on Internet are mainly discussed in the paper. An improved communication protocol is proposed which can decrease the transmission quantity without changing the differential positioning accuracy...
For Internet based real-time teleoperation systems, unknown and variable time delay can cause instability in the closed loop control system and hence hinder task accomplishment. According to requirement of Internet-based teleoperation, exact prediction of RTT can improve greatly performance of the teleoperation system. In this paper, statistical properties of the Round Trip Timedelay (RTT) are investigated...
Due to the bandwidth constraint, the network inevitably induces time delay in the Internet-based control system, which will affect the performance of Internet-based closed-loop control systems such as performance degradation and system destabilization. The variable-rate sampling strategy is proposed based on the proposed dual closed-loops control architecture to overcome the uncertain transmission...
First Internet based teleoperation system structure and time delay is described. And then two network delay regulators are added to eliminate delay jittering and disturbance. At last two compensators are designed based on dynamic matrix control algorithm. Simulation results have shown that the new control scheme can improve dynamic performance of the system and maintain the stability of the control...
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