Patents by Inventor Ian H. Duncan

Ian H. Duncan 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).

  • Publication number: 20180324090
    Abstract: A multicast method for Segment Routing includes, in a Segment Routing network with a plurality of nodes, wherein Segment Routing utilizes globally significant labels as node identifiers such that path state installation is only required at an ingress node of a Segment Routing domain, advertising a multicast flow by a source node; determining roles in the multicast flow for the plurality of nodes; and installing appropriate forwarding behavior for the multicast flow at the plurality of nodes based on the determined roles. The advertising can utilize Interior Gateway Protocol (IGP). For the multicast flow, source node segments are used to construct source routed trees rather than destination-based paths, wherein the source routed trees define broadcast paths, versus destination-based paths which are used in Segment Routing to define a node segment.
    Type: Application
    Filed: July 13, 2018
    Publication date: November 8, 2018
    Inventors: Ian H. Duncan, Nigel L. Bragg
  • Patent number: 9326052
    Abstract: A forwarder for use within an internetworking system operating over an ATM backbone is provided. The physical internetworking devices within the system are shared to provide the internetworking functions while servicing two or more distinct and isolated user networks. This is accomplished by logically partitioning the devices into distinct sub-elements which provide all or part of the internetworking functions. These sub-elements are uniquely allocated to independent realms which are then assigned to specific user networks.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: April 26, 2016
    Assignee: Alcatel Lucent
    Inventors: Ian H Duncan, Ken Young, Grant Hall, James Watt
  • Patent number: 9100133
    Abstract: The present disclosure relates to carrying synchronization through Ethernet, Optical Transport Network (OTN), and other asynchronous protocols. In one exemplary embodiment, timing markers or symbols are used in packets to enable a downstream device to recover timing based upon a time differential between markers or symbols. Advantageously, enabling Ethernet, OTN, etc. to carry synchronous information will de-risk switching from SONET/SDH to Ethernet and/or OTN for service providers. The present disclosure also includes frame decomposition scheme of the Ethernet stream. Ethernet packets are broken into fixed bandwidth and excess bandwidth. The fixed bandwidth is subdivided into fixed (negotiated) flits, with each flit corresponding to a specific user or combination of users like a private tunnel. This offers service providers a method to provide deterministic and more secure bandwidth over Ethernet to multiple clients.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 4, 2015
    Assignee: Ciena Corporation
    Inventors: Michaël Gazier, Ian H. Duncan, Morteza Ghodrat
  • Patent number: 8832755
    Abstract: The present invention provides methods and systems to remove the dependence on the IP layer (OSI layer three) in Video-on-Demand (VoD) transport networks. The present invention replaces the IP layer with Ethernet layer two addressing and even layer one, allowing connectivity in access/aggregation networks without IP layer three capabilities. The present invention enables STBs to communicate with VoD controllers, servers, and the like at layer two and/or layer one, eliminating the need for layer three routing capabilities in access/aggregation networks.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: September 9, 2014
    Assignee: Ciena Corporation
    Inventors: Michael A. Gazier, Morteza Ghodrat, Ian H. Duncan
  • Patent number: 8787394
    Abstract: The present disclosure provides a separate Ethernet forwarding and control plane system, method, network, and architecture with a Link State Interior Gateway route reflector for the control plan system and a layer two network architecture for the forwarding system. The present invention optionally utilizes a cloud implementation for the Designated Router (DR) or designated peering node reducing peering requirements and distributing the functionality. Through the architecture of the present invention, the Provider router is obviated by the application of layer two switches and servers. Such an architecture provides improved scaling, performance, and cost reduction.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: July 22, 2014
    Assignee: Ciena Corporation
    Inventors: Nigel L. Bragg, Ian H. Duncan
  • Patent number: 8787170
    Abstract: The present invention utilizes control plane signaling to dynamically configure flexible, existential ports. The ports are referred to as existential as their nature can change over time depending on the present need of the network, and because the ports are flexible and reconfigurable to a plurality of bit rates and protocols. The present invention removes the constraints of provisioning individual ports and connections, such as from a network management system, and integrates the concept of flexible ports with signaling and control plane methods utilized for routing in modern networks. Advantageously, the present invention extends service providers' investments in equipment, and reduces operating expenses in providing systems that are able to dynamically deal with various network configurations and with low touch by automatically performing provisioning. The methods and systems of the present invention can be extended to other networks utilizing flexible ports, such as wireless radios and the like.
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: July 22, 2014
    Assignee: Ciena Corporation
    Inventors: Lyndon Y. Ong, Michael A. Gazier, Ian H. Duncan
  • Patent number: 8467290
    Abstract: Network elements in IMS or other SIP systems are configured to pre-authenticate SIP requests either as proxy or by snooping. One or more of these network elements are pre-loaded with a local database copy of the user profiles as typically contained in the HSS inside of the IMS control structures. A master database, such as the one typically contained in the HSS, is distributed to all network elements using database distribution methods. Advantageously, pre-authentication solves bottleneck issues in the SIP mechanism by allowing an end user device to use fully authenticated SIP requests. This prevents the requirement to perform authentication, authorization, and accounting (AAA) all the way back to the core IMS network, alleviating lag and scaling issues. Additionally, network elements including can become aware of the services requested through SIP requests, and track these requests for optimization. Specifically, resources requested based upon SIP requests can be cached.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: June 18, 2013
    Assignee: Ciena Corporation
    Inventors: Michael A. Gazier, Lyndon Y. Ong, Ian H. Duncan
  • Patent number: 8355333
    Abstract: A network method utilizing Session Initiation Protocol to establish a network path between network elements in a network includes generating a request for a network service in Session Initiation Protocol, wherein the request is one of manually and automatically configured, and wherein the request is directed to the network; obtaining network resources responsive to the request, wherein the network resources comprise network parameters required to obtain and provision the network path; and configuring the network resources responsive to the request. The network includes a plurality of network elements operable to receive Session Initiation Protocol requests. Optionally, the plurality of network elements include a plurality of optical network elements, wherein the network route includes wavelengths between a first and second optical network element in the network.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: January 15, 2013
    Assignee: Ciena Corporation
    Inventors: Michael A. Gazier, Lyndon Ong, Ian H. Duncan
  • Publication number: 20120195319
    Abstract: The present disclosure provides a separate Ethernet forwarding and control plane system, method, network, and architecture with a Link State Interior Gateway route reflector for the control plan system and a layer two network architecture for the forwarding system. The present invention optionally utilizes a cloud implementation for the Designated Router (DR) or designated peering node reducing peering requirements and distributing the functionality. Through the architecture of the present invention, the Provider router is obviated by the application of layer two switches and servers. Such an architecture provides improved scaling, performance, and cost reduction.
    Type: Application
    Filed: February 1, 2011
    Publication date: August 2, 2012
    Inventors: Nigel L. BRAGG, Ian H. Duncan
  • Patent number: 8059685
    Abstract: The present invention reserves special Ethernet timing packets to mark timing within Ethernet and OTN, and secondarily creates frames within the Ethernet stream through the timing marker packets. The result is standard Ethernet with timing capability that can be transported over standard Ethernet links and/or within OTN. This timing capability can be utilized to carry synchronization over asynchronous Ethernet and OTN streams. Advantageously, enabling Ethernet and OTN to carry synchronous information will de-risk switching from SONET/SDH to Ethernet and/or OTN for service providers. The present invention also includes frame decomposition of the Ethernet stream. Ethernet packets are broken into fixed bandwidth and excess bandwidth. The fixed bandwidth is subdivided into fixed (negotiated) flits, with each flit corresponding to a specific user or combination of users like a private tunnel.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: November 15, 2011
    Assignee: Ciena Corporation
    Inventors: Morteza Ghodrat, Michael A. Gazier, Ian H. Duncan
  • Publication number: 20110228776
    Abstract: A forwarder for use within an internetworking system operating over an ATM backbone is provided. The physical internetworking devices within the system are shared to provide the internetworking functions while servicing two or more distinct and isolated user networks. This is accomplished by logically partitioning the devices into distinct sub-elements which provide all or part of the internetworking functions. These sub-elements are uniquely allocated to independent realms which are then assigned to specific user networks.
    Type: Application
    Filed: June 2, 2011
    Publication date: September 22, 2011
    Applicant: ALCATEL-LUCENT CANADA INC.
    Inventors: Ian H Duncan, Ken Young, Grant Hall, James Watt
  • Patent number: 7961727
    Abstract: An internetworking system operating over an ATM backbone. The physical internetworking devices within the system are shared to provide the internetworking functions while servicing two or more distinct and isolated user networks. This is accomplished by logically partitioning the devices into distinct sub-elements which provide all or part of the internetworking functions. These sub-elements are uniquely allocated to independent realms which are then assigned to specific user networks.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: June 14, 2011
    Assignee: Alcatel-Lucent Canada Inc.
    Inventors: Ian H Duncan, Ken Young, Grant Hall, James Watt
  • Patent number: 7962619
    Abstract: The present invention utilizes an XML-based protocol for controlling a plurality of settings to tie network equipment together, such as telecommunications, cable, enterprise, wireless, etc., across different transport network technologies, including optical, wireless, TDM, and packet. Network requests are carried in self-describing XML messages that are parsed by a general XML language parser. This changes the paradigm of XML used to control data records to XML controlling network equipment. This has many benefits including the ability to better function in the new IMS infrastructures being assembled.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: June 14, 2011
    Assignee: Ciena Corporation
    Inventors: Michael A. Gazier, Lyndon Y. Ong, Ian H. Duncan
  • Publication number: 20110019681
    Abstract: The present disclosure relates to carrying synchronization through Ethernet, Optical Transport Network (OTN), and other asynchronous protocols. In one exemplary embodiment, timing markers or symbols are used in packets to enable a downstream device to recover timing based upon a time differential between markers or symbols. Advantageously, enabling Ethernet, OTN, etc. to carry synchronous information will de-risk switching from SONET/SDH to Ethernet and/or OTN for service providers. The present disclosure also includes frame decomposition scheme of the Ethernet stream. Ethernet packets are broken into fixed bandwidth and excess bandwidth. The fixed bandwidth is subdivided into fixed (negotiated) flits, with each flit corresponding to a specific user or combination of users like a private tunnel. This offers service providers a method to provide deterministic and more secure bandwidth over Ethernet to multiple clients.
    Type: Application
    Filed: September 30, 2010
    Publication date: January 27, 2011
    Inventors: Michaël Gazier, Ian H. Duncan, Morteza Ghodrat
  • Publication number: 20100014518
    Abstract: An internetworking system operating over an ATM backbone. The physical internetworking devices within the system are shared to provide the internetworking functions while servicing two or more distinct and isolated user networks. This is accomplished by logically partitioning the devices into distinct sub-elements which provide all or part of the internetworking functions. These sub-elements are uniquely allocated to independent realms which are then assigned to specific user networks.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 21, 2010
    Applicant: ALCATEL-LUCENT CANADA INC.
    Inventors: Ian H. Duncan, Ken Young, Grant Hall, James Watt
  • Patent number: 7583665
    Abstract: An internetworking system operating over an ATM backbone. The physical internetworking devices within the system are shared to provide the internetworking functions while servicing two or more distinct and isolated user networks. This is accomplished by logically partitioning the devices into distinct sub-elements which provide all or part of the internetworking functions. These sub-elements are uniquely allocated to independent realms which are then assigned to specific user networks.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: September 1, 2009
    Assignee: Alcatel-Lucent Canada, Inc.
    Inventors: Ian H. Duncan, Ken Young, Grant Hall, James Watt
  • Publication number: 20080271096
    Abstract: The present invention provides methods and systems to remove the dependence on the IP layer (OSI layer three) in Video-on-Demand (VoD) transport networks. The present invention replaces the IP layer with Ethernet layer two addressing and even layer one, allowing connectivity in access/aggregation networks without IP layer three capabilities. The present invention enables STBs to communicate with VoD controllers, servers, and the like at layer two and/or layer one, eliminating the need for layer three routing capabilities in access/aggregation networks.
    Type: Application
    Filed: April 30, 2007
    Publication date: October 30, 2008
    Inventors: Michael A. Gazier, Morteza Ghodrat, Ian H. Duncan
  • Publication number: 20080175154
    Abstract: The present invention utilizes control plane signaling to dynamically configure flexible, existential ports. The ports are referred to as existential as their nature can change over time depending on the present need of the network, and because the ports are flexible and reconfigurable to a plurality of bit rates and protocols. The present invention removes the constraints of provisioning individual ports and connections, such as from a network management system, and integrates the concept of flexible ports with signaling and control plane methods utilized for routing in modem networks. Advantageously, the present invention extends service providers' investments in equipment, and reduces operating expenses in providing systems that are able to dynamically deal with various network configurations and with low touch by automatically performing provisioning. The methods and systems of the present invention can be extended to other networks utilizing flexible ports, such as wireless radios and the like.
    Type: Application
    Filed: January 24, 2007
    Publication date: July 24, 2008
    Inventors: Lyndon Y. Ong, Michael A. Gazier, Ian H. Duncan
  • Publication number: 20080155659
    Abstract: Network elements in IMS or other SIP systems are configured to pre-authenticate SIP requests either as proxy or by snooping. One or more of these network elements are pre-loaded with a local database copy of the user profiles as typically contained in the HSS inside of the IMS control structures. A master database, such as the one typically contained in the HSS, is distributed to all network elements using database distribution methods. Advantageously, pre-authentication solves bottleneck issues in the SIP mechanism by allowing an end user device to use fully authenticated SIP requests. This prevents the requirement to perform authentication, authorization, and accounting (AAA) all the way back to the core IMS network, alleviating lag and scaling issues. Additionally, network elements including can become aware of the services requested through SIP requests, and track these requests for optimization. Specifically, resources requested based upon SIP requests can be cached.
    Type: Application
    Filed: December 26, 2006
    Publication date: June 26, 2008
    Inventors: Michael A. Gazier, Lyndon Y. Ong, Ian H. Duncan
  • Publication number: 20080151941
    Abstract: The present invention reserves special Ethernet timing packets to mark timing within Ethernet and OTN, and secondarily creates frames within the Ethernet stream through the timing marker packets. The result is standard Ethernet with timing capability that can be transported over standard Ethernet links and/or within OTN. This timing capability can be utilized to carry synchronization over asynchronous Ethernet and OTN streams. Advantageously, enabling Ethernet and OTN to carry synchronous information will de-risk switching from SONET/SDH to Ethernet and/or OTN for service providers. The present invention also includes frame decomposition of the Ethernet stream. Ethernet packets are broken into fixed bandwidth and excess bandwidth. The fixed bandwidth is subdivided into fixed (negotiated) flits, with each flit corresponding to a specific user or combination of users like a private tunnel.
    Type: Application
    Filed: December 26, 2006
    Publication date: June 26, 2008
    Inventors: Morteza Ghodrat, Michael A. Gazier, Ian H. Duncan