Abstract
We analyze a discrete-time two-class queueing system with a single server which is alternately available for only one customer class. The server is each time allocated to a customer class for a geometrically distributed amount of time. Service times of the customers are deterministically equal to 1 time slot each. During each time slot, both classes can have at most one arrival. The bivariate process of the number of customers of both classes can be considered as a two-dimensional nearest-neighbor random walk. The generating function of this random walk has to be obtained from a functional equation. This type of functional equation is known to be difficult to solve. In this paper, we obtain closed-form expressions for the joint probability distribution for the number of customers of both classes, in steady state.
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Notes
We remark that \(\Delta (z)=-\sqrt{D_Y(z)}\) if \(z\in [1,\tau _T]\), due to the properties of the principal square root.
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Devos, A., Walraevens, J., Fiems, D. et al. Analysis of a discrete-time two-class randomly alternating service model with Bernoulli arrivals. Queueing Syst 96, 133–152 (2020). https://doi.org/10.1007/s11134-020-09663-x
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DOI: https://doi.org/10.1007/s11134-020-09663-x
Keywords
- Two-class queueing model
- Processor sharing
- Singularity analysis
- Analytic continuation
- Nearest-neighbor random walk