Transient analysis of the Erlang A model
Abstract
We consider the Erlang A model, or queue, with Poisson arrivals, exponential service times, and parallel servers, and the property that waiting customers abandon the queue after an exponential time. The queue length process is in this case a birth-death process, for which we obtain explicit expressions for the Laplace transforms of the time-dependent distribution and the first passage time. These two transient characteristics were generally presumed to be intractable. Solving for the Laplace transforms involves using Green's functions and contour integrals related to hypergeometric functions. Our results are specialized to the queue, the queue, and the loss model. We also obtain some corresponding results for diffusion approximations to these models.
Keywords
Cite
@article{arxiv.1412.2982,
title = {Transient analysis of the Erlang A model},
author = {Charles Knessl and Johan S. H. van Leeuwaarden},
journal= {arXiv preprint arXiv:1412.2982},
year = {2014}
}