Abstract
Several gateway-based congestion control mechanisms have been proposed to support an end-to-end congestion control mechanism of TCP (Transmission Control Protocol). One of promising gateway-based congestion control mechanisms is a RED (Random Early Detection) gateway. In this paper, we analyze the transient behavior of the RED gateway when the number of TCP connections is changed. We model both TCP connections and the RED gateway as a single feedback system, and analyze the dynamics of the number of packets in the RED gateway's buffer when the number of TCP connections is increased or decreased. Through numerical examples, we quantitatively show that the transient performance of the RED gateway is quite sensitive to system parameters such as the total number of TCP connections, the processing speed of the RED gateway. We also show that control parameters of the RED gateway have little impact on the transient behavior of the RED gateway.
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