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Approximate Transient Analysis of Some Queuing Systems

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  • T. C. T. Kotiah

    (Southern Illinois University, Edwardsville, Illinois)

Abstract

We propose approximations for the time-dependent queue size distribution P n ( t ) and the mean queue size E [ X ( t )] of an M / M /1 queue. With a Laplace transform-generating function technique, the exact analysis involves the complex root u * inside the unit circle of a certain quadratic. The exact value of u * leads to transforms that, when inverted, yield rather complicated expressions for P n ( t ) and E [ X ( t )]. We discuss three iterative procedures that give successive rational approximations for u *. These approximations yield, for the queue size distribution and the mean queue size, approximate transforms that are rational and easier to invert. We obtain sharp bounds for P n ( t ) and E [ X ( t )] for a wide range of parameter values by performing the second iteration and combining the approximate results given by the iterative procedures.The methods can be applied to approximate the behavior of more complicated queues. Applications to the M / M /2 queue and the M / E p /1 queue are discussed briefly.

Suggested Citation

  • T. C. T. Kotiah, 1978. "Approximate Transient Analysis of Some Queuing Systems," Operations Research, INFORMS, vol. 26(2), pages 333-346, April.
    • Handle: RePEc:inm:oropre:v:26:y:1978:i:2:p:333-346
    DOI: 10.1287/opre.26.2.333
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    Cited by:

    1. Chaithanya Bandi & Nikolaos Trichakis & Phebe Vayanos, 2019. "Robust Multiclass Queuing Theory for Wait Time Estimation in Resource Allocation Systems," Management Science, INFORMS, vol. 65(1), pages 152-187, January.
    2. Kleijnen, J.P.C., 1978. "The role of statistical methodology in simulation," Other publications TiSEM 05085a08-4669-4775-adc5-4, Tilburg University, School of Economics and Management.

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