Mixed Estimates for the Lost-Call Probability

Two new estimates for the lost-call probability are investigated for a full-available queueing system with Poisson input. The first estimate is based on the observed values of the number of calls served and the total system busy time; the second estimate is based on the observed values of the total system busy time and the total time spent in the service of calls. Expressions are derived for the variances of these estimates in the case of a multiserver “Poisson” system with losses. The accuracies of the new estimates are compared with those of more conventional estimates.