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1 Journal of Applied Computer Science Methods

1 2012

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Robust Flow Controllers for a Single Virtual Circuit in Data Transmission Networks with Lossy Links

Bartoszewicz A., Leśniewski P.

Journal of Applied Computer Science Methods

2012

Vol. 4 No. 1

5--20

The paper concerns an application of regulation theory methods to modeling and effective control of connection-oriented data transmission networks. In particular the problem of congestion control in a single virtual circuit of such a network is considered and new discrete-time sliding mode data flow rate controllers are proposed. The controllers are designed in such a way that packet losses are explicitly accounted for. The closed-loop system stability and finitetime error convergence are proved. Moreover, a number of favorable properties of the proposed controllers are stated as theorems, formally proved and verified in a simulation example. It is demonstrated that the proposed controllers guarantee full utilization of the available bandwidth and eliminates the risk of bottleneck node buffer overflow. Application of time-varying sliding hyperplanes helps avoid excessive transmission rates at the beginning of the control process.