This paper investigates the channel holding time and call inter-arrival distributions in cellular telephony systems. Up untiA ,ww, it has been generally assumed that both these distrit-,iitions citn be approximated by the negative exponential model. A scudy is presented which, using real cellular data, determines thc actual distributions. It is shown that the negative exponential assurnption for charinel holding time is not correct and that a lognormal model iipproximation fits much closer.

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