A mechanism for a rate policy that determines what happens when there isn't enough bandwidth to satisfy guaranteed rate requests (such as refuse connections or give a trickle of bandwidth). See Apply Admission Control.
A step in every flow activation, when the required bandwidth is allocated (or not) according to user demand (minimum bandwidth and maximum number of connections) and system state.
A first-come first-serve resource allocation policy in which requests for guarantees are rejected if the resulting total utilization would exceed some threshold.