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Determining approaches to congestion and flow control, especially real-time components in an overall strategy, is recognized as one of the fundamental challenges facing broadband 'packet-based' information transport, as, for instance, in the case of BISDN/ATM. In this paper we summarize basic issues underlying this subject, and describe a particular approach to achieving a multilayer broadband congestion, flow and error-control architecture, based on a 'core' congestion control strategy that we term bandwidth management. The modular and layered nature of this control architecture is described, and shown to lend itself to a structured approach to characterizing the control architecture performance.

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In this paper, we derive an algorithm for computing various performance measures for a window-based flow control, subject to bandwidth management. Bandwidth management is a mechanism for maintaining a fair allocation of network resources among customers. We provide an analytic procedure for computing the transmission rate allowed by the window, as well as the throughput of successfully transmitted frames (excluding retransmissions) that the customer can achieve. We will show that, when the network is at a given level of congestion, a customer can choose an appropriate window size to optimize the throughput of successfully transmitted frames, subject to bandwidth management.