Improvement of maximum admissible QoS traffic by traffic observations

We propose a scalable call admission control (CAC) scheme that avoids link congestion while maximizing the total admissible traffic of an IP backbone network. Our proposed scheme is scalable in the sense that it requires bandwidth reservation management only at ingress nodes instead of at every links in the core network. We have already evaluated the performance of admissible traffic in case where traffic observations are not executed at ingress nodes in the reference [1]. In this paper, in order to increase admissible traffic volumes, we newly formulate an LP problem in case where traffic observations are executed at ingress nodes for estimating offered traffic volumes between ingress and egress node pairs. We evaluated our proposed scheme for NSFNET and COST239 and showed that the total admissible traffic increases about 2.7 and 2.5 times more for NSFNET and COST239, respectively, compared with the case where traffic observations are not executed.