SIGNALING PROTOCOL FOR REROUTING ATM CONNECTIONS IN PNNI ENVIRONMENTS

摘要

A method in a connection based communication network for rerouting acall connection path coupling a calling and a called party. Rerouting is donewithin a peer group and may be performed in any peer group level along theconnection path. The method allows individual segments within peer groups to bererouted for a number of different reasons such as fault recovery, routeoptimization, bandwidth adjustment, and load balancing. The reroutable callpaths are implemented by inserting rerouting information elements in the standardsetup and connect messages used to create call paths in PNNI environments.These information elements permit both nonpreemptive rerouting, establishing anew call path before the old one is terminated and preemptive rerouting,establishing a new path after the old one is terminated. Additional features suchas, preserving QoS metrics during rerouting and separately identifying differentincarnations of segments along the same call path are also provided.