Effects of Day-to-Day Load Variation on Trunk Group Blocking
Arik N. Kashper, Sol M. Rocklin, C. R. Szelag · Bell System Technical Journal · 1982
Modern trunking theory recognizes the need to account for day-today load variation when sizing a trunk group for an average blocking objective. This paper investigates the effects of high levels of load variation on average blocking, the measure of service used for sizing final trunk groups in the Public Switched Network. Specifically, we identify a curious phenomenon in which high day-to-day variation results in low average blocking and characterize the traffic theoretic models for which this occurs. By a similar analysis, we also investigate the behavior of an alternate measure of service, the probability of blocking, measured by the ratio of the number of unsuccessful attempts to the total number of attempts.