Conversion of rate based flow control algorithms to window based algorithms

ABSTRACT Master of Science Thesis CONVERSION OF RATE BASED FLOW CONTROL ALGORITHMS TO WINDOW BASED ALGORITHMS ÖZENYELBAŞI Anadolu University Graduate School of Natural and Applied Sciences Electrical and Electronics Engineering Program Supervisor: Prof. Altuğ İFTAR December 2003, 89 pages In this thesis, the conversion of rate based flow control algorithms used in high-speed data communication networks to window (credit) based algorithms is studied. A rate based robust flow controller, designed using the H00 approach, for a single-bottleneck network is considered. A feedback system model is developed in order to convert the rates, computed by this controller to window sizes and to transmit the window sizes to the sources. The uncertainty model of the system is developed by using the time delay uncertainties. Algorithms are developed so that the sending rates are indirectly controlled by the control of the window sizes. Time-domain behaviour of the system is observed by performing simulations in Simulink (MATLAB). Keywords: Data communication networks, time-delay systems, H00 control, rate based flow control, window based flow control 11