J. ROSZIK et al.: RETRIAL QUEUES IN THE PERFORMANCE MODELING OF... RETRIAL QUEUES IN THE PERFORMANCE MODELING OF CELLULAR MOBILE NETWORKS USING MOSEL

Abstract

Abstract: This paper investigates a multiserver infinite-source retrial queueing system for the performance modeling of cellular mobile communication networks. The objective is to demonstrate how performance tool MOSEL (Modeling, Specification and Evaluation Language) can be efficiently used in the modeling of cell based networks. In our analysis the blocked and dropped users are treated separately, that is they redial with different probabilities and different rates, with reducing the state space by maximizing the number of redialing customers with appropriately large values (i. e. when the ignored probability mass can be neglected). The guard channel scheme is included in the model, too. The novelty of our analysis is that not only the active but also both types of redialing customers are allowed to depart to other cells, which was not the case in the previous works. The model description is translated step by step into the description language of MOSEL, and then it is automatically converted into the other tool-specific system descriptions and analyzed by the appropriate tools. As the benefit of the tool the effects of various system parameters on the fresh call blocking probability, on the handoff call dropping probability and on the grade of service are displayed and analyzed graphically