ACCESS-CONTROL OF BURSTY VOICE TRAFFIC IN ATM NETWORKS

Asynchronous Transfer Mode (ATM) Broadband Networks are expected to pr ovide a large number of services and applications. A predominant servi ce will be the support of multimedia traffic applications that integra te different types of traffic (e.g., video, voice and data) over the s ame connection. The heterogeneous traffic-types differ, widely, not on ly in their individual bit-rates but also in their corresponding corre lations and burstiness parameters. Access flow control algorithms are required to enforce and maintain a specific QOS for each type of traff ic. In this paper, we present an effective access flow control algorit hm that can be applied at the user to network interface (UNI). The sch eme is based upon a preventive control principle and uses a control si gnal, that is function of the buffer occupancy level, to control the s ource coder sampling rate. The scheme avoids congestion and enhances t he statistical multiplexing gain, consequently providing a higher band width utilization for each QOS. We provide a performance analysis stud y, supported by simulations, of the access node multiplexer. We studie d the resulting Quasi Birth Death queueing process, with state dependa nt arrivals, using matrix-geometric techniques, and found that both MM PP/Er/1/K and the Poisson Process approximations provided very close r esults for an ATM multiplexer with small buffer size and access contro l.