Practical approaches for connection admission control in multiservice networks

In this paper, we test and compare the effectiveness of various connection admission control (CAC) schemes when confronted by heavy arrivals of new connection requests in a link with different server rates. Four CAC schemes are used for this study. The first two schemes are based on the use of a priori traffic information and the model-based approach of computing the desired service bandwidth. For the remaining two schemes, a measurement-based alternative is implemented instead, and hence the desired service bandwidth is estimated by online measurements of the aggregated traffic behavior. Simulation results have shown that the measurement-based schemes are efficient CAC procedures because of the inclusions of a conservative link occupancy-based threshold and an adaptive weight factor that maintain the procedures around the desired link utilization, whilst meeting the QoS.