Loss rates in the single-server queue with complete rejection

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Consider the single-server queue in which customers are rejected if their total sojourn time would exceed a certain level K. A basic performance measure of this system is the probability PK that a customer gets rejected in steady state. This paper presents asymptotic expansions for PK as K¿8. If the service time B is light-tailed and inter-arrival times are exponential, it is shown that the loss probability has an exponential tail. The proof of this result heavily relies on results on the two-sided exit problem for Lévy processes with no positive jumps. For heavy-tailed (subexponential) service times and generally distributed inter-arrival times, the loss probability is shown to be asymptotically equivalent to the trivial lower bound P(B>K). Keywords: Queues; Complete rejection; Loss probability; Lévy processes; Two-sided exit problem; Asymptotic expansions
Original languageEnglish
Pages (from-to)299-315
JournalMathematical Methods of Operations Research
Issue number3
Publication statusPublished - 2015

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