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TR#: 00-41 TR title: A Control Theoretic Analysis of RED Authors : C.V Hollot, V. Misra, D. Towsley, W. Gong Address Computer Science Department 140 Governor''s Drive University of Massachusetts Amherst, MA 01003-4601 Date: 7/10/00 A Control Theoretic Analysis of RED In this report we use a previously developed monlinear dynamic model of TCP to analyze and esign Active Queue Management (AQM) Control Systems using RED. First, we linearize the interconnection of TCP and a bottlenecked queue and discuss its feedback properties in terms of network parameters such as link capacity, load and round-trip time. Using this model, we next design an AQM control system using the random early detection (RED) scheme by relating its free parameters such as the low-pass filter break point and loss probability profile to the network parameters. We present guidelines for designing linearly stable systems subject to network parameters like propogation delay and load level. Robustness to variations in system loads is a prime objective. We present ns simulations to support our analysis.