Multiparameter qos admission control for atm queues with partial buffer sharing mechanism

In this paper, we present an admission control technique for mixed real-time and non-real-time traffic in finite length queues with PBS cell loss control. Real-time connections have both delay and loss constraints while non-real-time connections are only subject to cell loss constraints. We propose to provide each type of traffic with a separate capacity subregion with different QoS bounds. We introduce the concept of virtual effective bandwidth (VEB) for the traffic source inside the capacity subregion. VEB of the source depends on the traffic descriptors of the source, QoS bound for a given traffic class, and on the sum of average arrival rates of connections from other traffic classes. In the case of one capacity region, virtual effective bandwidth of the connection is equal to the its effective bandwidth. Expressions of virtual effective bandwidth for each specific capacity subregion under different QoS limits have been derived. These limits include average queue length, the second derivative of queue length probability generating function (PGF) which constrains both delay and delay jitter, aggregate traffic losses, and target connection losses. The expressions show the relationships between the QoS limits given an (virtual) effective bandwidth. Based on these expressions, we propose an admission control algorithm which can manage separate capacity subregions with different types of traffic and different QoS requirements. The bandwidths of capacity subregions can be dynamically adjusted to satisfy the instantaneous needs of real-time and non-real-time traffic