Distributed precomputation of signal paths in an optical network

Details Distributed precomputation of signal paths in an optical network Distributed precomputation of signal paths in an optical network

1997-10-29

2000-06-06

Heckler, Thomas M.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

359118, G06F 1100, H04B 1020

Patent

active

060732482

ABSTRACT:
Distributed precomputation techniques for determining primary and/or restoration paths in an optical network. The invention provides a number of partially and fully asynchronous distributed precomputation algorithms which may be implemented, for example, by the nodes of an all-optical network, in which network links are constrained in terms of optical signal wavelength and failure isolation. A given distributed precomputation algorithm may include a first phase in which paths are allocated for capacity demands to the extent possible without resolving contentions, and a second phase in which contentions between demands for the same capacity are resolved. The first phase may implement a contention locking mechanism which locks a primary path of a given demand to prevent other demands from contending for the same capacity, and a link capacity control mechanism which involves storing a link status table at one or more nodes, the link status table listing a number of specific failures and demands which are affected by the failures. The second phase of the distributed precomputation algorithm reroutes paths previously allocated to one or more demands in order to free up capacity required for another demand, so as to optimize overall network capacity utilization.

REFERENCES:
patent: 5495471 (1996-02-01), Chow et al.
patent: 5646936 (1997-07-01), Shah et al.
patent: 5835482 (1998-11-01), Allen

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