Patents by Inventor Jeong-Dong Ryoo

Jeong-Dong Ryoo 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: 20190104073
    Abstract: A frame transmission controlling apparatus includes: a list configuration unit managing a parameter related to a gate control; a cycle timer unit managing a start timing of a cycle; a list executing unit performing the gate control based on the parameter, wherein the list executing unit includes: a cycle executing state machine setting an expiration time of at least one section included in the cycle, checking gate operation information corresponding to a list pointer indicating the at least one section, and performing a control corresponding to the gate operation information; a delaying state machine deducting and updating the expiration time by a predetermined unit; a cycle holding state machine generating a control signal indicating stopping transmission in MAC; and a cycle releasing state machine generating a control signal indicating resuming the transmission in MAC.
    Type: Application
    Filed: September 27, 2018
    Publication date: April 4, 2019
    Inventors: Chang Ho CHOI, Tae Kyu KANG, Jeong Dong RYOO, Tae Sik CHEUNG
  • Patent number: 10237121
    Abstract: A linear protection switching-based domain connecting method includes determining, by a protection interconnecting node, a user traffic transceiving path based on information on a presence or absence of defect in working paths and protection paths, generating working path control information and protection path control information based on information on the determined user traffic transceiving path and the information on the presence or absence of the defect in the protection paths, and transmitting the generated working path information to the working interconnecting node, and connecting two paths among the protection paths, and the connection path based on the protection path control information.
    Type: Grant
    Filed: October 15, 2016
    Date of Patent: March 19, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jeong-dong Ryoo, Taesik Cheung, Kyung Gyu Chun
  • Patent number: 10009272
    Abstract: Provided is a packet transmission apparatus including at least one user network interface (UNI) line card configured to receive traffic including a client signal, a fabric switch configured to perform switching on the traffic based on a unit of line card, a network-to-network interface working (NNI-W) line card configured to generate a multiprotocol label switching-transport profile (MPLS-TP) working tunnel to transmit the traffic transferred through the fabric switch, and a network-to-network interface protection (NNI-P) line card configured to generate a MPLS-TP protection tunnel to transmit the traffic transferred through the fabric switch when a fault occurs on a path of the NNI-W line card.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: June 26, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Won Kyoung Lee, Jeong Dong Ryoo, Tae Sik Cheung
  • Publication number: 20170331727
    Abstract: A protection switching method and apparatus using operator's command in a dual-node interconnection-based protection switching. An operation method of a third end node receives an operator's command for selecting one of a working path and a protection path in a protection domain, receives information about an isolation status of a second end node and the third end node in an adjacent recovery domain connected through the second end node connected to the working path and the third end node connected to the protection path, determines whether to connect to the second end node based on information about the isolation status, delivers traffic to a path determined based on the operator's command and whether to connect to the second end node, and transfers, to the second end node, information about a connectivity decision including whether to connect to the second end node.
    Type: Application
    Filed: May 10, 2017
    Publication date: November 16, 2017
    Inventors: Jeong-dong RYOO, Taesik CHEUNG
  • Patent number: 9806939
    Abstract: Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: October 31, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Dae Ub Kim, Jeong Dong Ryoo, Tae Sik Cheung
  • Publication number: 20170222715
    Abstract: A method of localizing a defect location and a method of identifying a cause of a defect in an optical transport network (OTN). The method of localizing a defect location in an OTN includes generating tandem connection monitoring (TCM) coordinates consisting of a TCM level and trail information of an optical data unit (ODU) based on a relationship between an OTN line card (LC) and the ODU in the OTN, localizing the defect location in the OTN by converting the TCM level to a segment on the TCM coordinates, and identifying a root cause using a defect identification algorithm that traces back the cause of the defect in an opposite direction to that in which the defect is propagated based on an OTN layer structure.
    Type: Application
    Filed: January 5, 2017
    Publication date: August 3, 2017
    Inventors: Won Kyoung LEE, Ho Geon KIM, Jeong-dong RYOO, Taesik CHEUNG, Bheom Soon JOO
  • Publication number: 20170111213
    Abstract: A linear protection switching-based domain connecting method includes determining, by a protection interconnecting node, a user traffic transceiving path based on information on a presence or absence of defect in working paths and protection paths, generating working path control information and protection path control information based on information on the determined user traffic transceiving path and the information on the presence or absence of the defect in the protection paths, and transmitting the generated working path information to the working interconnecting node, and connecting two paths among the protection paths, and the connection path based on the protection path control information.
    Type: Application
    Filed: October 15, 2016
    Publication date: April 20, 2017
    Inventors: Jeong-dong RYOO, Taesik CHEUNG, Kyung Gyu CHUN
  • Patent number: 9621487
    Abstract: A protection switching method and apparatus based on a memory control in a packet transport system are provided. The protection switching method may perform hardware-based protection switching based on a type of path failures that occur. The protection switching method may perform protection switching for each of an Automatic Protection Switching (APS) frame or a Loss of Continuity (LoC)/Clear Loss of Continuity (CLoC) message received via an interface unit from a packet processor, a LoC/CLoC message received via a local bus interface from a host processor, an APS frame generation command input via the local bus interface from protection software (SW) of the host processor, and an APS frame generation command input via another interface unit from the protection SW.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: April 11, 2017
    Assignee: Electronics and Telecommunications Research Insitute
    Inventors: Yong Wook Ra, Jeong Dong Ryoo
  • Patent number: 9515871
    Abstract: An apparatus and method for protection switching are disclosed. The protection switching method in accordance with an example of the present disclosure is capable of smoothly processing a protection switching while preventing a data path mismatch occurring in the protection switching in a case in which a forced switching command (FS), which is a passive command, and a signal failure (SF) of a protection path occur at both end nodes, respectively, when a linear protection switching is performed by use of a protection state coordination message in a packet network or a packet transport network.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: December 6, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Dae-Ub Kim, Tae-Sik Cheung, Jeong-Dong Ryoo
  • Publication number: 20160344630
    Abstract: Provided is a packet transmission apparatus including at least one user network interface (UNI) line card configured to receive traffic including a client signal, a fabric switch configured to perform switching on the traffic based on a unit of line card, a network-to-network interface working (NNI-W) line card configured to generate a multiprotocol label switching-transport profile (MPLS-TP) working tunnel to transmit the traffic transferred through the fabric switch, and a network-to-network interface protection (NNI-P) line card configured to generate a MPLS-TP protection tunnel to transmit the traffic transferred through the fabric switch when a fault occurs on a path of the NNI-W line card.
    Type: Application
    Filed: May 20, 2016
    Publication date: November 24, 2016
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Won Kyoung LEE, Jeong Dong RYOO, Tae Sik CHEUNG
  • Publication number: 20160149802
    Abstract: A communication terminal performing protection switching in a shared mesh network is provided. The communication terminal configured to transmit and receive data traffic associated with a first working path may include a processor configured to encode, in an optical channel data unit (ODU) including the data traffic, a first operation command message to be received from a first end node, and a communicator configured to transmit the ODU to a neighboring node, in which the first end node is present in a second working path.
    Type: Application
    Filed: October 29, 2015
    Publication date: May 26, 2016
    Inventors: Ji Wook YOUN, Jeong Dong RYOO, Tae Sik CHEUNG, Ho Geon KIM, Seung Woo LEE
  • Publication number: 20160142286
    Abstract: Provided is an operation method of a node, the method including recognizing multiple failures occurring in a protected domain, transmitting a message including failure information, multiple-failure information, and used path information to a second node when the multiple failures are recognized, and performing a protection switching to a used path determined based on a priority for each of the multiple failures.
    Type: Application
    Filed: November 19, 2015
    Publication date: May 19, 2016
    Inventors: Dae Ub KIM, Jeong Dong RYOO, Tae Sik CHEUNG
  • Patent number: 9191272
    Abstract: In a network in which a plurality of protection paths have been formed for one working path between a first node and a second node, each node determines preference levels corresponding to an order to be preferentially used when performing protection switching on the plurality of protection paths. Next, each node exchanges pieces of information about the preference levels determined for the plurality of protection paths.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: November 17, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Taesik Cheung, Jeong-Dong Ryoo
  • Patent number: 9160563
    Abstract: Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: October 13, 2015
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Jeong-Dong Ryoo, June-Koo Rhee, Bheom-Soon Joo, Jin-Sung Im, Zahir Uddin Ahmad, Yang Yang, Marc Holness
  • Publication number: 20150271107
    Abstract: A protection switching method and apparatus based on a memory control in a packet transport system are provided. The protection switching method may perform hardware-based protection switching based on a type of path failures that occur. The protection switching method may perform protection switching for each of an Automatic Protection Switching (APS) frame or a Loss of Continuity (LoC)/Clear Loss of Continuity (CLoC) message received via an interface unit from a packet processor, a LoC/CLoC message received via a local bus interface from a host processor, an APS frame generation command input via the local bus interface from protection software (SW) of the host processor, and an APS frame generation command input via another interface unit from the protection SW.
    Type: Application
    Filed: March 13, 2015
    Publication date: September 24, 2015
    Inventors: Yong Wook RA, Jeong Dong RYOO
  • Patent number: 9124502
    Abstract: An apparatus of determining blocking in an Ethernet ring network sets blocking with respect to each of the plurality of links in an Ethernet ring network, and determines one of the plurality of links as a link to be blocked by using traffic request amounts of a plurality of service flows with respect to the respective links set to be blocked.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: September 1, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kwang-Koog Lee, Jeong-dong Ryoo
  • Patent number: 9030925
    Abstract: A method for protection switching in a shared node where protection resources of a plurality of end-to-end linear protection domain are shared is provided. The shared node receives a first protection switching event message notifying that a protection switching event occurs from a first node of a first end-to-end linear protection domain, and determines whether to prohibit protection switching on a second end-to-end linear protection domain by comparing a priority of the first end-to-end linear protection domain with a priority of the second end-to-end linear protection domain.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: May 12, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Sik Cheung, Jeong-dong Ryoo
  • Publication number: 20150109900
    Abstract: Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 23, 2015
    Inventors: Dae Ub KIM, Jeong Dong RYOO, Tae Sik CHEUNG
  • Publication number: 20150098317
    Abstract: Provided is a protection end node located at an end of a protection path, wherein the protection end node includes a receiver to receive, from a working end node located at an end of a working path, path defect information indicating whether a defect occurs on the working path, a processor to perform protection switching in response to reception of the path defect information and generate path control information used for the working end node to control a connection of the working path based on the protection switching, and a transmitter to transmit the path control information to the working end node.
    Type: Application
    Filed: October 6, 2014
    Publication date: April 9, 2015
    Inventors: Tae Sik CHEUNG, Jeong Dong RYOO, Dae Ub KIM
  • Patent number: 8988982
    Abstract: A method of performing protection switching in a network including a first node and a plurality of second nodes that are connected to the first node is provided. The first node counts the number of obstacles that have occurred in a plurality of paths that are connected between the plurality of second nodes, and if the counted number is smaller than a predetermined threshold value, the first node performs protection switching per leaf. Alternatively, if the counted number is equal to or larger than a predetermined threshold value, the first node performs protection switching per tree.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: March 24, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Daeub Kim, Jeong-dong Ryoo, Taesik Cheung