On the H ∞ Controller Design for Congestion Control in Communication Networks with a Capacity Predictor 1

In this paper we investigate the use of the outgoing link capacity information in the H∞ controller design for rate based flow control in a communication network for the case of a single bottleneck node and a single source. In the previous works in this line of research it was assumed that the controller implemented at the bottleneck node has access to queue length information, and robust controllers were designed for queue management, under time varying time delay uncertainties. Here we assume that, besides the queue information, the controller has access to the outgoing link capacity. On top of the existing robust controller, we use an additional controller term, acting on the capacity information. We investigate optimal ways to design such additional controller term.

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