Connection admission control for hard real-time communication in ATM networks

Connection Admission Control (CAC) as needed in ATM networks to provide Quality of Service (QoS) guarantees real-time connections. In this paper, we present a CAC scheme based on (1) a bit-stream traffic model to describe traffic generation patterns of CBR/VBR connections and traffic distortions within a network, and (2) worst-case queueing analysis to obtain hard cell queueing delay bounds. The proposed CAC scheme can be used for the establishment of hard real-time connections in ATM networks with conventional static priority FIFO queueing switches. The effectiveness of the scheme is illustrated by applying it to an ATM-based Real-Time Plant Control Network (RTPCN) currently under development by the Mitsubishi Electric Corporation. The CAC scheme presented in the paper can also be extended to set up soft real-time connections in ATM networks.