A CAC scheme for heterogeneous traffic in ATM networks to support multiple QoS requirements

We propose a connection admission control (CAC) scheme which supports multiple quality of service (QoS) requirements. Our scheme is based on the approach which determines the virtual bandwidth for each class of traffic and decomposes the system into multiple sub-queueing systems, one for each class. The steady-state analysis of the MMPP/CD/1/K queue gives the exact cell loss probability of each sub-queueing system and estimates more accurately the number of connections to accommodate each of them. Moreover, in order to improve the bandwidth utilization of the segregated sub-queueing systems, we take into account the sharable state among them. The concept of sharable state enables one to increase the number of admitted calls without deteriorating the system performance. Our approach is computable in real time. Finally, we verify the analytic results with simulation.