Crankback prediction in hierarchical ATM networks

When an ATM node discovers that it cannot continue the setup of a virtual channel under the requested QoS, it initiates a back-tracking procedure called “crankback”. We propose a novel scheme, referred to as crankback prediction, that decreases the crankback overhead. Under the proposed scheme, nodes check during the connection admission control procedure whether the establishment of a virtual channel has a good chance to be admitted over the entire designated route. If this is not the ease, crankback is initiated even before a certain QoS parameter is exceeded