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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">mathnas</journal-id><journal-title-group><journal-title xml:lang="ru">Труды Института математики НАН Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Institute of Mathematics of the NAS of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1812-5093</issn><publisher><publisher-name>Институт математики НАН Беларуси</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mathnas-73</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕОРИЯ ВЕРОЯТНОСТЕЙ И МАТЕМАТИЧЕСКАЯ СТАТИСТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PROBABILITY THEORY AND MATHEMATICAL STATISTICS</subject></subj-group></article-categories><title-group><article-title>Стационарный анализ многолинейной системы массового обслуживания с неоднородными приборами и распределением времени обслуживания фазового типа</article-title><trans-title-group xml:lang="en"><trans-title>Steady-state analysis of the multi-server retrial queueing system with heterogeneous servers and phase type distribution of service times</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лю</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Liu</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">liumei19910101@126.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дудин</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Dudin</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">dudin@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>30</day><month>06</month><year>2025</year></pub-date><volume>33</volume><issue>1</issue><fpage>111</fpage><lpage>120</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Лю М., Дудин А.Н., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Лю М., Дудин А.Н.</copyright-holder><copyright-holder xml:lang="en">Liu M., Dudin A.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mathnas.ejournal.by/jour/article/view/73">https://mathnas.ejournal.by/jour/article/view/73</self-uri><abstract><p>Анализируется многолинейная система обслуживания с повторными вызовами и неоднородными серверами. Длительности обслуживания имеют фазовое распределение с различными неприводимыми представлениями. Поступление запросов в систему определяется марковским процессом поступления. Когда все серверы заняты в момент поступления, запрос помещается в виртуальное место, называемое орбитой, чтобы повторить попытку достичь серверов через экспоненциально распределенные периоды времени. Общая скорость повторных вызовов с орбиты бесконечно увеличивается с ростом числа запросов, находящихся на орбите. При поступлении или повторных вызовах с орбиты запрос занимает сервер с минимальным номером среди всех свободных серверов, если таковые имеются. Динамика состояний системы описывается многомерной цепью Маркова, имеющей специальную блочную структуру инфинитезимального генератора. Представлено явное выражение для генератора. Выведено условие эргодичности. Приведены выражения для вычисления ключевых характеристик производительности системы. Представлены численные результаты, иллюстрирующие зависимости характеристик производительности системы от средней скорости поступления заявок для системы и ее частных случаев, когда поступления описываются стационарным пуассоновским процессом или (и) времена обслуживания подчиняются экспоненциальному распределению.</p></abstract><trans-abstract xml:lang="en"><p>A multi-server retrial queueing system with heterogeneous servers is analysed. The service times have a phase-type distribution with different irreducible representations. Customer arrival to the system is defined by a Markovian arrival process. When all servers are busy at an arrival moment, the customer moves to the virtual place called orbit to retry to reach the servers in exponentially distributed periods of time. The total retrial rate from the orbit infinitely increases when the number of customers residing in orbit grows. Upon arrival or retrial from the orbit, a customer occupies the server having the minimal number among all idle servers, if any. The dynamics of the system states is described by a multidimensional Markov chain having the special block structure of the infinitesimal generator. The explicit expression for this is presented. Ergodicity condition is derived. The expressions for computation of the key performance characteristics of the system are given. Numerical results, which highlight dependencies of these measures on the mean arrival rate for the system and its particular cases, when the arrivals are described by the stationary Poisson process or (and) service times follow the exponential distribution, are presented.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Марковский процесс поступления</kwd><kwd>повторные попытки</kwd><kwd>неоднородные серверы</kwd><kwd>распределение фазового типа</kwd><kwd>асимптотически квазитеплицевы цепи Маркова</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Markovian arrival process</kwd><kwd>retrials</kwd><kwd>heterogeneous servers</kwd><kwd>phase-type distribution</kwd><kwd>asymptotically quasi-Toeplitz Markov chains</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This research has received support by the Belarusian Republican Foundation for Fundamental Research (grant F25UZB-016) and the Ministry of Higher Education, Science and Innovations of the Republic of Uzbekistan (grant FL-8824063218).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Falin G. 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