Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1997-12-29
2000-08-29
Patel, Ajit
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370400, H04L 1228
Patent
active
061118818
ABSTRACT:
A method in a connection based communication network for rerouting a call connection path coupling a calling and a called party. Rerouting is done within a peer group and may be performed in any peer group level along the connection path. The method allows individual segments within peer groups to be rerouted for a number of different reasons such as fault recovery, route optimization, bandwidth adjustment, and load balancing. The reroutable call paths are implemented by inserting rerouting information elements in the standard setup and connect messages used to create call paths in PNNI environments. These information elements permit both nonpreemptive rerouting, establishing a new call path before the old one is terminated and preemptive rerouting, establishing a new path after the old one is terminated. Additional features such as, preserving QoS metrics during rerouting and separately identifying different incarnations of segments along the same call path are also provided.
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ATM Forum, entitled Baseline Document of Edge-Based Rerouting for Point-to-Point Connection AF/97-0779 by Hitoshi Masuo et al. (Sep. 1997).
ATM Forum, entitled QoS Preservation in PNNI Rerouting, AF/97-0872 by David M. Kushi et al. (Sep. 1997).
ATM Forum, entitled Message Formats and IE Encodings for Rerouting, AF/97-0871 by David M Kushi et al. (Sep. 1997).
ATM Forum, entitled Fault Tolerance for Point-to-Point Connections in PNNI, AF/97-0541 by Hitoshi Masuo et al. (Jul. 1997).
ATM Forum, entitled Fault Tolerance for Point-to-Multipoint Connections in PNNI, AF/97-0542 by Hitoshi Masuo et al. (Jul. 1997).
ATM Forum, entitled Procedures for Fast Connection Recovery in PNNI Networks, AF/97-0632 b Ethan Mickey Spiegel et al. (Jul. 1997).
Article entitled White Paper: PNNI Control Point, IBM ATM Networking Group, Zurich Research Lab, dated Mar. 1997.
Nortel Networks Corporation
Patel Ajit
Pizarro Ricardo M.
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