Performance analysis of prioritized token ring

An analytic model for prioritized token ring is presented. Its protocol is based on prioritized token ring with reservation (R-PTR). Since the protocol of the R-PTR is simple and the performance of the R-PTR is not inferior to that of the IEEE standard 802.5 under almost all traffic load environments, the R-PTR is used as the token ring model. By using the properties of the Markovian process, expressions for average throughput and average packet transmission delay are derived. The results obtained from the analytic model are compared with those of the simulation model. It is observed that analytic and simulation results are consistent with each other for the high-priority-level packet. However, there is a small discrepancy for the low-priority-level packet, but this discrepancy is acceptable.<
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