Issues on Performance Evaluation of Switching Nodes with Shallow Buffer under Time-Correlated Traffic

Moisés R. N. RibeiroMike J. O'Mahony

A model suitable for describing time-correlated arrivals and traffic forwarding at time-slotted output-buffered switching nodes is thoroughly investigated regarding marginal distribution, correlation structure, load spatial partition, and traffic aggregation. Straightforward, though exact, analytical tools are developed and validated against numerical simulations. Results show that realistic outcomes can still be obtained from appropriate low-complexity analytical models since strictly correlated forwarding and hotspot do not significantly influence most important traffic features which the investigated model is able to represent. Moreover, long-range dependence may not be an issue when evaluating performance of nodes with limited buffer space (e.g. photonic packet switching).

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