Importance

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Abstract

The upper and lower bounds of the probability distributions of the number of arrivals at given arrival rates and the upper and lower bounds of the distributions of the arrival rates of each call class are prestored in memory, and by referencing such prestored values, the distributions of the arrival rate and the number of arrivals are obtained (step 104), then, the upper and lower bounds of the resulting cell length distribution are calculated to obtain safe-side evaluation values of QOS parameters (step 106). Based on the obtained QOS parameters, admission or rejection of a call is determined (step 108). Using this method, a function defining the upper bound of the probability distribution of the cell flow rate at the outgoing line side can also be obtained, from which a threshold value is calculated, and abnormality in the cell flow rate is judged on the basis of the threshold value. Furthermore, using a similar method to the above one, it is possible to evaluate the cell length distribution when a UPC is provided on the outgoing line side, and from the result of the evaluation, an optimum declared value to the UPC can be obtained to set up an internetwork connection via the UPC.

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First Claim