Rate Control of Traffic Sources Based on Level Crossing in a Congested Buffer

This paper presents a study of some rate control policies for traffic sources based on feedback from a congested buffer. The study of these policies is motivated by the increasing amount of traffic from applications using transport protocols without built-in mechanisms for congestion control. The sources are here modeled as simple ON-OFF sources, and the control policies have been studied based on a continuous fluid-flow approximation of the traffic. Further, we have looked at the level crossing rates in the queue to study how much signalling is required for these schemes when explicit congestion notification is given. Some measures on how this will affect the quality at the receiving end are also given. Keywords: rate control, real time traffic, fluid-flow, level crossing