A multiclass priority-based slotted-ring network for LAN-ATM interworking

Interworking LANs with an ATM backbone network is considered a cost-effective and most promising solution for bringing ATM into the mainstream. To sustain delay-sensitive applications (e.g., video or voice) and loss-sensitive applications (e.g., data transfer), this paper presents a slotted-ring network (SRN) with spatial reuse. In order to provide nonpreemptive multipriority services over SRN, a simple priority-based media access protocol, called the check requested before send (CRBS), is proposed. A dynamic priority assignment technique is described to assign priorities based on their delay and loss requirements. An analytical model is presented to analyze CRBS protocol under Poisson input traffic and uniform output traffic. Extensive simulations are run to assess the performance of CRBS protocol for two classes of cells with priorities 0 and 1.