The main goals of a switch scheme are high utilization, low queuing delay and fairness. To achieve high utilization the switch scheme can maintain non-zero (small) queues in steady state which can be used if the sources do not have data to send. It is very important to design and analyze the queue control function which is used in such a scheme. In this contribution we study various queue control functions and present analytical explanation of its behavior and simulation results. From the study, we conclude that a simple linear queue control function performs satisfactorily.
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