Sojourn time distributions in the queue defined by a general QBD process |
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Authors: | Toshihisa Ozawa |
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Institution: | (1) Department of Business Administration, Komazawa University, 1-23-1 Komazawa, Setagaya-ku, Tokyo 154-8525, Japan |
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Abstract: | We consider a general QBD process as defining a FIFO queue and obtain the stationary distribution of the sojourn time of a
customer in that queue as a matrix exponential distribution, which is identical to a phase-type distribution under a certain
condition. Since QBD processes include many queueing models where the arrival and service process are dependent, these results
form a substantial generalization of analogous results reported in the literature for queues such as the PH/PH/c queue. We
also discuss asymptotic properties of the sojourn time distribution through its matrix exponential form. |
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Keywords: | Quasi-birth-and-death process Queueing model Sojourn time distribution Matrix-exponential distribution |
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