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arXiv 1902.02137math.PRcs.PF
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一种基于令牌的服务率与顺序无关的中心排队系统

A token-based central queue with order-independent service rates

U. Ayesta, T. Bodas, J. L. Dorsman, I. M. Verloop

摘要:

研究了一种基于令牌的多客户中心排队模型。每种类型的客户根据泊松过程到达,并且具有相关联的兼容令牌集。客户只有在申请兼容令牌时才能获得服务。如果在到达时,有多个兼容的令牌可用,则分配规则确定将声明哪个令牌。由客户获得的服务速率是依赖于状态的,即,它取决于所要求的令牌的集合和系统中的客户的数量。我们的第一个主要结果表明,只要分配规则和服务率满足一定的条件,稳态分布具有乘积形式。我们证明了我们的模型包含了已知的具有乘积形式稳态分布的模型族,包括Krzesinski(2011)的阶独立队列和Visschers等人的模型。我们的第二个主要贡献涉及推导表达式的相关性能指标,如逗留时间和系统中存在的客户数量。我们将该框架应用于相关模型,包括具有异构服务速率的M/M/K队列、MSCCC队列、具有冗余的多服务器模型和匹配模型。对于这些模型中的一些,我们提出了以前没有得到的性能指标的表达式。

英文摘要:

We study a token-based central queue with multiple customer types. Customers of each type arrive according to a Poisson process and have an associated set of compatible tokens. Customers may only receive service when they have claimed a compatible token. If upon arrival, more than one compatible token is available, an assignment rule determines which token will be claimed. The service rate obtained by a customer is state-dependent, i.e., it depends on the set of claimed tokens and on the number of customers in the system. Our first main result shows that, provided the assignment rule and the service rates satisfy certain conditions, the steady-state distribution has a product form. We show that our model subsumes known families of models that have product-form steady-state distributions including the order-independent queue of Krzesinski (2011) and the model of Visschers et al. (2012). Our second main contribution involves the derivation of expressions for relevant performance measures such as the sojourn time and the number of customers present in the system. We apply our framework to relevant models, including an M/M/K queue with heterogeneous service rates, the MSCCC queue, multi-server models with redundancy and matching models. For some of these models, we present expressions for performance measures that have not been derived before.

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