Optimal design for a retrial queueing system with state-dependent service rate

Optimal design for a retrial queueing system with state-dependent service rate
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服务率依赖于状态的重审排队系统优化设计

DOI:
10.1007/s11424-017-5097-9
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发表时间:
2017-05
影响因子:
2.1
通讯作者:
Ma Qing
Ma Qing
中科院分区:
数学3区
文献类型:
--
作者:
Zhang Xuelu;Wang Jinting;Ma Qing

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本文考虑单服务器重试队列,其中采用状态相关的服务策略来控制服务速率。客户按照泊松过程到达系统,服务次数和重试次数均呈指数分布。如果在轨客户数量等于或小于某个阈值,则服务费率设置为较低值,一旦超过阈值也可以切换为较高值。通过部分生成函数获得平稳分布和两个性能度量。结果表明,在某些条件下,这种依赖于状态的服务策略会退化为没有控制策略的经典重审排队系统。为了实现社会最优策略,建立了新的奖励成本函数,并通过规范粒子群优化算法获得的全局数值解表明,与经典模型相比,如果应用这种依赖于状态的服务策略,管理者可以获得更多收益。
This paper considers a single server retrial queue in which a state-dependent service policy is adopted to control the service rate. Customers arrive in the system according to a Poisson process and the service times and inter-retrial times are all exponentially distributed. If the number of customers in orbit is equal to or less than a certain threshold, the service rate is set in a low value and it also can be switched to a high value once this number exceeds the threshold. The stationary distribution and two performance measures are obtained through the partial generating functions. It is shown that this state-dependent service policy degenerates into a classic retrial queueing system without control policy under some conditions. In order to achieve the social optimal strategies, a new reward-cost function is established and the global numerical solutions, obtained by Canonical Particle Swarm Optimization algorithm, demonstrate that the managers can get more benefits if applying this state-dependent service policy compared with the classic model.
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