Protection scheme for a communications network under multiple failures
AssigneeAlcatel Lucent
InventorsDavid Elie-Dit-Cosaque, Maher Ali
Life of this patent
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Abstract
A system and method for implementing a shared protection scheme under a scenario of multiple failures in an optical network. In one embodiment of the invention, a working path between an ingress node and an egress node is computed responsive to a connection request received in the network. One or more backup paths are computed between the ingress and egress nodes, which are activatable upon a failure condition associated with the working path or the backup paths. The backup paths may be based on link and/or node disjointedness, as well as resource-based cost constraints.
Claims34
A method for providing protection in a communications network including a plurality of nodes coupled by communication links, comprising:
- responsive to a connection request received by an ingress node, computing a working path between said ingress node and an egress node;
- monitoring a quality of the nodes and the communication links;
- detecting a first quality degradation event indicative of a failure prediction of one of the nodes or one of the communications links;
- responsive to detecting the first quality degradation event, monitoring at least one of a temporal or spatial correlation of further possible quality degradation events with respect to the detected first quality degradation event to be able to detect a second quality degradation event indicative of another failure prediction of another one of the nodes or another one of the communication links;
- and
- responsive to detecting the second quality degradation event, computing a plurality of backup paths between said ingress and egress nodes where the nodes and/or the communication links associated with the first and second quality degradation events are not used in a same backup path.
A communication network including a plurality of nodes coupled by communication links, comprising:
- a quality monitor that monitors a quality of the nodes and the communication links;
- an ingress node, responsive to a connection request, that computes a working path between itself and an egress node;
- said quality monitor further detects a first quality degradation event indicative of a failure prediction of one of the nodes or one of the communications links;
- said quality monitor, responsive to detecting the first quality degradation event, monitors at least one of a temporal or spatial correlation of further possible quality degradation events with respect to the detected first quality degradation event to be able to detect a second quality degradation event indicative of another failure prediction of another one of the nodes or another one of the communication links;
- and
- said ingress node, responsive to the detection of the second quality degradation event, computes a plurality of backup paths between said ingress and egress nodes where the nodes and/or the communication links associated with the first and second quality degradation events would not be used in a same backup path.
A network element disposed as an ingress node in an optical network formed from a plurality of nodes that are inter-coupled via optical communication links, said ingress node including a computer readable medium having a plurality of instructions which when executed by a computer cause said ingress node to perform operations comprising:
- computing a working path between said ingress node and an egress node;
- upon receiving an indication that at least two quality degradation events having at least a temporal or spatial correlation with respect to one another have occurred which are indicative of a failure prediction of one or more of the nodes or one or more of the communications links, computing a plurality of backup paths between said ingress and egress nodes where the nodes and/or the communication links associated with the at least two quality degradation events are not used in a same backup path.
Dependencies are inferred from the claim text.