Patents by Inventor Zhuangbo Tang
Zhuangbo Tang 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: 7948899Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: GrantFiled: December 11, 2009Date of Patent: May 24, 2011Assignee: AT&T Intellectual Property II, LPInventors: Angela L. Chiu, Seyhan Civanlar, Leonard L. Lu, Zhuangbo Tang
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Patent number: 7792054Abstract: This invention provides a tool for reliability evaluation and performance analysis of an IP backbone network by using the network packet loss ratio as the main measurement. A queuing model and algorithm is presented for calculating packet loss at congested interfaces or links. A reliability model is presented for considering network hardware component failures such as router failures, ATM switch failures, and physical link failures. Based on the measurement and models presented, a network reliability and performance (NetRAP) apparatus calculates IP network reliability and performance measurements. The NetRAP apparatus uses the network topology, a traffic matrix, and the reliability parameters of a network as inputs and calculates the network packet loss ratio and sigma score, and provides a list of heavily congested links under non-failure or different single failure conditions.Type: GrantFiled: May 7, 2004Date of Patent: September 7, 2010Assignee: AT&T Intellectual Property II, L.P.Inventors: Leonard L. Lu, David A. Hoeflin, Zhuangbo Tang
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Patent number: 7778182Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: GrantFiled: August 26, 2005Date of Patent: August 17, 2010Assignee: AT&T Intellectual Property II, L.P.Inventors: Angela L. Chiu, Seyhan Civanlar, Leonard L. Lu, Zhuangbo Tang
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Publication number: 20100091656Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: ApplicationFiled: December 11, 2009Publication date: April 15, 2010Inventors: Angela L. Chiu, Seyhan Civanlar, Leonard L. Lu, Zhuangbo Tang
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Patent number: 7230924Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: GrantFiled: March 28, 2001Date of Patent: June 12, 2007Assignee: AT&T Corp.Inventors: Angela L. Chiu, Seyhan Civanlar, Leonard L. Lu, Zhuangbo Tang
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Patent number: 6999420Abstract: An architecture, design, and realization for providing Quality of Service (QoS) to Internet Protocol (IP) networks based on a three-class differentiated service scheme where the service provider uses a resource management system and a schedule optimizer to enable the optimal use of bandwidth and buffer resources at each node along the various links between the ingress and egress points in a network. The resource reservation system checks to determine whether sufficient bandwidth resources are available along the path requested by the customer for a particular class. The schedule optimizer ensures that sufficient buffer resource allocations and parameter settings are made to optimally reach the predetermined QoS criteria for each of the three classes. The system also contains a mechanism supporting resource reservations providing additional resources along alternative paths if the selected path links fail in the network.Type: GrantFiled: December 30, 1999Date of Patent: February 14, 2006Assignee: AT & T Corp.Inventors: Angela L. Chiu, Seyhan Civanlar, Albert Gordon Greenberg, Zhuangbo Tang
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Publication number: 20060018256Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: ApplicationFiled: August 26, 2005Publication date: January 26, 2006Inventors: Angela Chiu, Seyhan Civanlar, Leonard Lu, Zhuangbo Tang
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Patent number: 6973033Abstract: An architecture, design, and realization for providing Quality of Service (QoS) to Internet Protocol (IP) networks based on a three-class differentiated service scheme where the service provider uses a resource management system and a schedule optimizer to enable the optimal use of bandwidth and buffer resources at each node or router along the various links between the ingress and egress points in a network. The resource reservation system checks to determine if sufficient bandwidth resources are available along the path requested by the customer for a particular class. The schedule optimizer ensures that sufficient buffer resource allocations and parameter settings are made to optimally reach the predetermined QoS criteria for each of the three classes. The system also contains a mechanism supporting resource reservations providing additional resources along alternative paths if the selected path links fail in the network.Type: GrantFiled: March 23, 2004Date of Patent: December 6, 2005Assignee: AT&T Corp.Inventors: Angela L. Chiu, Seyhan Civanlar, Albert Gordon Greenberg, Zhuangbo Tang
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Publication number: 20040208128Abstract: This invention provides a tool for reliability evaluation and performance analysis of an IP backbone network by using the network packet loss ratio as the main measurement. A queuing model and algorithm is presented for calculating packet loss at congested interfaces or links. A reliability model is presented for considering network hardware component failures such as router failures, ATM switch failures, and physical link failures. Based on the measurement and models presented, a network reliability and performance (NetRAP) apparatus determining the IP network reliability and performance analysis. The NetRAP apparatus uses the network topology, a traffic matrix, and the reliability parameters of a network as inputs and calculates the network packet loss ratio and sigma score, and provides a list of heavily congested links under non-failure or different single failure conditions.Type: ApplicationFiled: May 7, 2004Publication date: October 21, 2004Inventors: Leonard L. Lu, David A. Hoeflin, Zhuangbo Tang
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Patent number: 6754843Abstract: This invention provides a tool for reliability evaluation and performance analysis of an IP backbone network by using the network packet loss ratio as the main measurement. A queuing model and algorithm is presented for calculating packet loss at congested interfaces or links. A reliability model is presented for considering network hardware component failures such as router failures, ATM switch failures, and physical link failures. Based on the measurement and models presented, a network reliability and performance (NetRAP) apparatus calculates IP network reliability and performance measurements. The NetRAP apparatus uses the network topology, a traffic matrix, and the reliability parameters of a network as inputs and calculates the network packet loss ratio and sigma score, and provides a list of heavily congested links under non-failure or different single failure conditions.Type: GrantFiled: June 13, 2000Date of Patent: June 22, 2004Assignee: AT&T Corp.Inventors: Leonard L. Lu, David A. Hoeflin, Zhuangbo Tang
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Patent number: 6744767Abstract: An architecture, design, and realization for providing Quality of Service (QoS) to Internet Protocol (IP) networks based on a three-class differentiated service scheme where the service provider uses a resource management system and a schedule optimizer to enable the optimal use of bandwidth and buffer resources at each node or router along the various links between the ingress and egress points in a network. The resource reservation system checks to determine if sufficient bandwidth resources are available along the path requested by the customer for a particular class. The schedule optimizer ensures that sufficient buffer resource allocations and parameter settings are made to optimally reach the predetermined QoS criteria for each of the three classes. The system also contains a mechanism supporting resource reservations providing additional resources along alternative paths if the selected path links fail in the network.Type: GrantFiled: December 30, 1999Date of Patent: June 1, 2004Assignee: AT&T Corp.Inventors: Angela L. Chiu, Seyhan Civanlar, Albert Gordon Greenberg, Zhuangbo Tang
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Publication number: 20020186658Abstract: This invention provides for a technique for selectively off-loading traffic from congested sub-regions of a network to more lightly-loaded regions by making use of Multiprotocol Label Switching (MPLS). For each network element, an Interior Gateway Protocol (IGP) routing is employed to provide re-routing and to identify congested links caused by re-routed trunks for each single failure. The re-routed traffic is then analyzed and alternate Label Switched Paths (LSPs) are identified for such traffic trunks so that the traffic is directed to the alternate LSPs during the single failure event.Type: ApplicationFiled: March 28, 2001Publication date: December 12, 2002Inventors: Angela L. Chiu, Seyhan Civanlar, Leonard L. Lu, Zhuangbo Tang