Adaptive connection admission and flow control: quality of service with high utilisation

In this paper, we use adaptive feedback and adaptive feedforward control methodologies to avoid congestion at high server utilisation. This addresses the combined connection admission and flow control problem (generic functions for managing and controlling traffic and congestion in BISDN). Using a novel control concept, based on only two groups of traffic (controllable and uncontrollable) we formulate a problem aimed at high (unity) utilisation of resources while maintaining quality of service at prescribed levels. Bounds on operating conditions are derived, and using simulation we show that high utilisation can be achieved as suggested by the theory, together with robustness for unforeseen traffic connections and disconnections. Even with such a high efficiency and strong properties on the quality of service, the only traffic descriptor required from the user is that of the peak rate of the uncontrollable traffic.