On rate-based congestion control in high speed networks: Design of an H? based flow controller for single bottleneck

Abstract

Typical congestion control algorithms for high speed networks include local flow controllers at the bottleneck nodes. In this paper an H? based controller is developed for rate feedback in a single bottleneck network. The rates can be assigned to the sources only after a certain transmission delay. Controller design specifications for this time delay system include "fairness" to multiple users, "usage" optimization, and minimization of the transients in the queue length. Stability robustness against uncertainties in time delays is also considered. By a simple algebra the problem is transformed to an H? control of a plant with a time delay, and it is solved by using an algorithm developed earlier for this class of problems