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In this paper, the authors investigate possible time-correlation of answered call arrivals in sets of real GSM telephone traffic data. Instead of attempting to model the empirical distribution of the call inter-arrival time, as done in several previous works in literature, they emphasize results obtained by the Modified Allan VARiance (MAVAR), a widely used time-domain quantity with excellent capability of discriminating power-law noise types. The call arrival rate exhibits a diurnal trend, with peak hours in the morning and late afternoon.
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