An exact performance model for the reserve channels CAC strategy at a bufferless network node

Abstract

The reserve channels call admission control (CAC) strategy in which the total number of channels available at the node is divided into active and reserve channels is analysed. Two types of customers are assumed to exist: the narrowband type requiring bandwidth b(n) = 1 channel and wideband type requiring b(w)greater than or equal to1 channels. The active channels are shared by all customer types while the reserve channels are allocated by a predefined rule. An exact matrix algorithmic solution technique is proposed that extends the previous results to the case of calls requiring b(w)greater than or equal to1 channels. Using the developed solution technique, the number of equations to be solved is decreased which reduces the solution time by more than half. The technique is applied to a sample case and performance results in terms of blocking probabilities for both types of calls as well as the mean server utilization are obtained. Copyright (C) 2003 John Wiley Sons, Ltd.