Patents by Inventor Matthew Roughan
Matthew Roughan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8145745Abstract: Method and apparatus for network-level anomaly inference in a network is described. In one example, link load measurements are obtained for multiple time intervals. Routing data for the network is obtained. Link level anomalies are extracted using temporal analysis on the link load measurements over the multiple time intervals. Network-level anomalies are inferred from the link-level anomalies.Type: GrantFiled: December 28, 2005Date of Patent: March 27, 2012Assignee: AT&T Intellectual Property II, L.P.Inventors: Zihui Ge, Albert Gordon Greenberg, Matthew Roughan, Yin Zhang
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Patent number: 8031599Abstract: A signature-based traffic classification method maps traffic into preselected classes of service (CoS). By analyzing a known corpus of data that clearly belongs to identified ones of the preselected classes of service, in a training session the method develops statistics about a chosen set of traffic features. In an analysis session, relative to traffic of the network where QoS treatments are desired (target network), the method obtains statistical information relative to the same chosen set of features for values of one or more predetermined traffic attributes that are associated with connections that are analyzed in the analysis session, yielding a statistical features signature of each of the values of the one or more attributes. A classification process then establishes a mapping between values of the one or more predetermined traffic attributes and the preselected classes of service, leading to the establishment of QoS treatment rules.Type: GrantFiled: December 10, 2009Date of Patent: October 4, 2011Inventors: Nicholas G. Duffield, Matthew Roughan, Subhabrata Sen, Oliver Spatscheck
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Patent number: 7917650Abstract: A method for balancing traffic across paths connecting a network to the Internet using a fractional allocation strategy for distributing the traffic from a congested selected path. The strategy includes: (a) associating the paths j with a counter i; (b) calculating the total initial selected path overload; (c) calculating the selected path load, wherein the load is equal to the initial selected path overload less the sum of the low capacity boundary for i path(s); (d) calculating the portion of the traffic on the selected path to be distributed using a bi-sectional search strategy; (e) distributing a portion of the traffic on the selected path to the other paths; and (f) stopping if there are no more paths (i=j), otherwise increasing the numerical value of the counter by one (1) and go to step (c).Type: GrantFiled: September 9, 2008Date of Patent: March 29, 2011Assignee: AT&T Intellectual Property II, L.P.Inventors: Kartikeya Chandrayana, Matthew Roughan, Subhabrata Sen, Yin Zhang
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Publication number: 20100195506Abstract: A computer-readable storage medium includes operational instructions, that when executed by a processor, cause the processor to receive network configuration data representing a network having a plurality of routers and to identify at least one of the plurality of routers as having a predicted oscillatory behavior based at least partially on the network configuration data.Type: ApplicationFiled: January 30, 2009Publication date: August 5, 2010Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Aman Shaikh, Matthew Roughan, Nigel Bean, Ashley Flavel
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Patent number: 7752337Abstract: The present invention utilizes a “small-world” network architecture, in which a relatively small number of random cross-links of nodes or vertices in a network can result in small characteristic path lengths, for the transfer of messages between modes or vertices in a telecommunications/computer network regardless of their location. The “small world” principle is usually considered to apply to many biological and social networks, as these systems generally exhibit properties that are not completely regular or completely random but somewhere in between. The present invention applies this small world principle to telecommunications/computer networks.Type: GrantFiled: June 30, 2000Date of Patent: July 6, 2010Assignee: Jifmar Pty LtdInventors: Fergus O'Brien, Matthew Roughan
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Publication number: 20100085889Abstract: A signature-based traffic classification method maps traffic into preselected classes of service (CoS). By analyzing a known corpus of data that clearly belongs to identified ones of the preselected classes of service, in a training session the method develops statistics about a chosen set of traffic features. In an analysis session, relative to traffic of the network where QoS treatments are desired (target network), the method obtains statistical information relative to the same chosen set of features for values of one or more predetermined traffic attributes that are associated with connections that are analyzed in the analysis session, yielding a statistical features signature of each of the values of the one ore more attributes. A classification process then establishes a mapping between values of the one or more predetermined traffic attributes and the preselected classes of service, leading to the establishment of QoS treatment rules.Type: ApplicationFiled: December 10, 2009Publication date: April 8, 2010Inventors: Nicholas G. Duffield, Matthew Roughan, Subhabrata Sen, Oliver Spatscheck
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Patent number: 7660248Abstract: A signature-based traffic classification method maps traffic into preselected classes of service (CoS). By analyzing a known corpus of data that clearly belongs to identified ones of the preselected classes of service, in a training session the method develops statistics about a chosen set of traffic features. In an analysis session, relative to traffic of the network where QoS treatments are desired (target network), the method obtains statistical information relative to the same chosen set of features for values of one or more predetermined traffic attributes that are associated with connections that are analyzed in the analysis session, yielding a statistical features signature of each of the values of the one or more attributes. A classification process then establishes a mapping between values of the one or more predetermined traffic attributes and the preselected classes of service, leading to the establishment of QoS treatment rules.Type: GrantFiled: January 23, 2004Date of Patent: February 9, 2010Inventors: Nicholas G. Duffield, Matthew Roughan, Subhabrata Sen, Oliver Spatscheck
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Patent number: 7574506Abstract: A method and apparatus for the estimation of traffic matrices in a network are disclosed.Type: GrantFiled: September 26, 2007Date of Patent: August 11, 2009Assignee: AT&T Intellectual Property II, L.P.Inventors: Nicholas G. Duffield, Albert Gordon Greenberg, John G. Klincewicz, Matthew Roughan, Yin Zhang
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Publication number: 20090037600Abstract: A method for balancing traffic across paths connecting a network to the Internet using a fractional allocation strategy for distributing the traffic from a congested selected path. The strategy includes: (a) associating the paths j with a counter i; (b) calculating the total initial selected path overload; (c) calculating the selected path load, wherein the load is equal to the initial selected path overload less the sum of the low capacity boundary for i path(s); (d) calculating the portion of the traffic on the selected path to be distributed using a bi-sectional search strategy; (e) distributing a portion of the traffic on the selected path to the other paths; and (f) stopping if there are no more paths (i=j), otherwise increasing the numerical value of the counter by one (1) and go to step (c).Type: ApplicationFiled: September 9, 2008Publication date: February 5, 2009Inventors: Kartikeya Chandrayana, Matthew Roughan, Subhabrata Sen, Yin Zhang
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Patent number: 7467224Abstract: A method for balancing traffic across paths connecting a network to the Internet using a fractional allocation strategy for distributing the traffic from a congested selected path. The strategy includes: (a) associating the paths j with a counter i; (b) calculating the total initial selected path overload; (c) calculating the selected path load, wherein the load is equal to the initial selected path overload less the sum of the low capacity boundary for i path(s); (d) calculating the portion of the traffic on the selected path to be distributed using a bi-sectional search strategy; (e) distributing a portion of the traffic on the selected path to the other paths; and (f) stopping if there are no more paths (i=j), otherwise increasing the numerical value of the counter by one (1) and go to step (c).Type: GrantFiled: February 17, 2004Date of Patent: December 16, 2008Assignee: AT&T Intellectual Property II, L.P.Inventors: Kartikeya Chandrayana, Matthew Roughan, Subhabrata Sen, Yin Zhang
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Patent number: 7293086Abstract: A method and apparatus for the estimation of traffic matrices in a network are disclosed. Mechanisms are disclosed for measuring traffic volume from a plurality of ingress points to a plurality of egress points in a large scanl network, such as an IP backbone network. The traffic matrix is advantageously inferred from widely available link load measurements such as SNMP data.Type: GrantFiled: July 25, 2003Date of Patent: November 6, 2007Assignee: AT&T Corp.Inventors: Nicholas G. Duffield, Albert Gordon Greenberg, John G. Klincewicz, Matthew Roughan, Yin Zhang
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Publication number: 20050182849Abstract: A method for balancing traffic across paths connecting a network to the Internet using a fractional allocation strategy for distributing the traffic from a congested selected path. The strategy includes: (a) associating the paths j with a counter i; (b) calculating the total initial selected path overload; (c) calculating the selected path load, wherein the load is equal to the initial selected path overload less the sum of the low capacity boundary for i path(s); (d) calculating the portion of the traffic on the selected path to be distributed using a bi-sectional search strategy; (e) distributing a portion of the traffic on the selected path to the other paths; and (f) stopping if there are no more paths (i=j), otherwise increasing the numerical value of the counter by one (1) and go to step (c).Type: ApplicationFiled: February 17, 2004Publication date: August 18, 2005Inventors: Kartikeya Chandrayana, Matthew Roughan, Subhabrata Sen, Yin Zhang