Comparative Analysis Of Call Admission Policies With Adaptive Routing In Multirate Networks

A multirate network can support services with different bandwidth requirements service characteristics and revenue earning rates. In this paper, we compare four call admission policies under the least congestion adaptive routing rule in a multirate network. The purpose of call admission control is to prevent the dominance of network capacity by a particular class of calls. Analysis on fully connected networks show that the Limited Occupancy(LO) and the Guaranteed Bandwidth (GB) policies can all be used to manipulate the relative blocking probabilities of different classes of calls provided that the bandwidth reservation parameters are suitably selected. On the other hand: they all tend to reduce the revenue of the network when compared to the Complete Sharing(CS) policy. The Direct-link Packing(DP) policy, however, is found to give significant reductions in both blocking probabilities and revenue loss when compared to the CS policy. Thus the DP policy offers the best overall performance under the least congestion routing rule.