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Stability condition for a single-server retrial queue

Published online by Cambridge University Press:  01 July 2016

Huei-Mei Liang*
Affiliation:
National Central University, Taiwan
V. G. Kulkarni*
Affiliation:
University of North Carolina, Chapel Hill
*
Postal address: Department of Mathematics, National Central University, Taiwan, ROC.
∗∗ Postal address: Department of Operations Research, University of North Carolina, Chapel Hill, NC 27599–3180, USA.

Abstract

A single-server retrial queue consists of a primary queue, an orbit and a single server. Assume the primary queue capacity is 1 and the orbit capacity is infinite. Customers can arrive at the primary queue either from outside the system or from the orbit. If the server is busy, the arriving customer joins the orbit and conducts a retrial later. Otherwise, he receives service and leaves the system.

We investigate the stability condition for a single-server retrial queue. Let λ be the arrival rate and 1/μ be the mean service time. It has been proved that λ/μ < 1 is a sufficient stability condition for the M/G/1/1 retrial queue with exponential retrial times. We give a counterexample to show that this stability condition is not valid for general single-server retrial queues. Next we show that λ /μ < 1 is a sufficient stability condition for the stability of a single-server retrial queue when the interarrival times and retrial times are finite mixtures of Erlangs.

MSC classification

Type
Research Article
Copyright
Copyright © Applied Probability Trust 1993 

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