Performance Study of Multistage ATM Switches Using an Accurate Model of the Behavior of Blocked Cells

概要

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Most of the existing analytical models for multistage ATM switching fabric are not accurate in the presence of a non-uniform traffic at the input of the switch. In this paper, we discuss the issues in modeling a multistage ATM switching fabric,and investigate the effect of independence assumptions in two previous analytical models. A highly accurate 4-state Markov chain model for evaluating the performance of ATM switching fabrics based on multistage switches with 2 x 2 finite output-buffered SEs is proposed. The proposed model correctly reflects the correlation of cell movements between two subsequent cycles and states of the buffers of two adjacent stages. By comparing the results obtained from the proposed model, existing models and simulations, it has been shown that the proposed model is much more accurate than existing models in the presence of a non-uniform traffic in the switch. The results from the existing models are unsatisfactory in the presence of an increased blocking in the switch arising from a non-uniform traffic in the switch. On the contrary,the proposed model is very robust even under severe blocking in the switch.
社団法人電子情報通信学会の論文
1996-11-25