The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2002
Filed:
Aug. 17, 1998
Nortel Networks Limited, Montreal, CA;
Abstract
A method is described for route computation in Communications Networks with multiple QoS metrics. This method takes a metric (say, cost) as an optimization target and the other metric (say, delay) as a constraint. A communication network with multiple QoS metrics associated to its links is modelled as a graph with multiple QoS metrics as weights associated to its links. The method associates constraints with nodes in the graph after generating a minimum spanning tree based at a destination node using Dijkstra's algorithm with the constraint metric as link weight. A set is populated with nodes whose path to the destination node satisfies given constraints while endeavouring to optimize another QoS metric. A path may be computed by selecting, from the set, the destination node and associated predecessor nodes through to the start node. The algorithm of the method is very efficient and its computational complexity is O(n ). This method can guarantee to find a nearly optimal path with the given constraint satisfied as long as there exists such a path.