A FINITE POPULATION MODEL AND PRODUCT-FORM APPROXIMATION FOR CELLULAR MOBILE SYSTEMS WITH TRAVELING USERS(<Special Issue>the 50th Anniversary of the Operations Research Society of Japan)

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  • A finite population model and product-form approximation for cellular mobile systems with traveling users

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We propose a new finite population model for cellular mobile systems with traveling users. In this model, mobile users arrive according to a Poisson process from outside the system, independently travel in the system, and leave the system in due time. A mobile user is either in call (active) or out of call (inactive). We find that if two minor modifications are made to the model, the joint distribution of the number of calls in progress in each cell has the product form. Making the two modifications is referred to as product-form approximation in this paper. Under the product-form approximation, the probability that channels are fully occupied in a cell is given by the Erlang-loss formula. We evaluate the accuracy of the product-form approximation through several simulation experiments, and find that the Erlang-loss formula remains applicable to the performance evaluation and channel provisioning of cellular mobile systems.

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