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: 121
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: 2026
: .., .. // . - 2026. - . 121. - .17-30.
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(.): retrial queueing system, nonstationary process, rate of convergence, exponential ergodicity, logarithmic norm
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(.): This paper is devoted to the study of convergence properties of a nonstationary retrial queueing system operating with a single server and an orbit of unlimited capacity. The main focus is on the quantitative estimation of the rate at which the system approaches its limiting regime. For the homogeneous model with constant intensities, sufficient conditions for exponential ergodicity are established, expressed in terms of the service parameters. Using the method of logarithmic norm and the technique of weighted spaces, estimates of the convergence rate are constructed, allowing one to judge the duration of the transient process. For the nonstationary regime, where the intensities are represented as the sum of a constant component and a small perturbation, weak exponential ergodicity is proved and an explicit estimate of the convergence rate is obtained. A numerical example demonstrates the effectiveness of the obtained estimates and their higher accuracy compared to known results.
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