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Markov-modulated flow model for the output queues of a packet switch

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3 Author(s)
Chen, J.S.C. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Guerin, R. ; Stern, T.E.

The output queues of an M×N packet switch are studied using a Markov-modulated flow model. The switching element is a central server which sequentially routes packets from the inputs to the outputs. The focus is on systems in which the server speed is such that the bulk of the queuing takes place in the output queues. The conventional point process approach neglects the impact of switching and transmission time. An attempt is made to account for these finite system speeds by using a Markov-modulated continuous flow to approximate the arrival process to an output queue. This model captures the dependency between arrivals at different outputs and reflects the fact that packet arrivals and departures are not instantaneous. The output queue content distribution is obtained, for both infinite and finite buffer systems, from the spectral expansion of the solution of a system of differential equations. Numerical examples and comparisons with the results of an M/M/1 approximation are presented

Published in:

Communications, IEEE Transactions on  (Volume:40 ,  Issue: 6 )

Date of Publication:

Jun 1992

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