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:
Jun. 27, 2000
Filed:
Nov. 19, 1997
Cagatay Buyukkoc, Holmdel, NJ (US);
David J Houck, Colts Neck, NJ (US);
Pravin Kumar Johri, Aberedeen, NJ (US);
Kathleen S Meier-Hellstern, Cranbury, NJ (US);
Rodolfo Alberto Milito, Piscataway, NJ (US);
AT&T Corp, New York, NY (US);
Abstract
An efficient approach and corresponding apparatus for selecting virtual paths in a network for routing datagrams achieves effective sharing of capacity without adversely affecting call setup latency. Edge nodes of the network assign calls to virtual paths based on the destination of the call and the current load status of each of a relatively small number of paths. Each call is assigned a VPI (Virtual Path Identifier) corresponding to the path chosen and a VCI (Virtual Circuit Identifier) corresponding to the identity of the call at that edge node. The ATM backbone nodes route calls based solely on the VPI. Capacity management and load balancing is achieved by each edge node keeping track of the load on each access link from its edge node to the rest of the network and of the congestion status of the various links in the network. In one embodiment, the edge node periodically sends information about its usage of the network to a 'central fabric network interface' which combines information from all edge nodes, evaluates congestion status for the network links, and forwards that information back to the edge nodes.