Multiserver Retrial Queues with Finite Number of Heterogeneous Sources

The aim of this paper is to investigate a multiserver retrial queueing system with a finite number of heterogeneous sources of calls. The novelty of the investigation is the heterogeneity of the sources, that is every source is characterized by dierent arrival, retrial and service rates. All random variables involved in the model construction are assumed to be exponentially distributed and independent of each other. The present paper generalizes the results for the same type of homogeneous retrial queueing system. The MOSEL (Modeling, Specification and Evaluation Language) language and software package, which was developed at the University of Erlangen, Germany, was used to formulate the model and to calculate the derived main performance measures. The eects of various system parameters on the system measures are displayed and analyzed graphically.