Patents by Inventor Ho Sook Lee

Ho Sook Lee 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).

  • Patent number: 10425906
    Abstract: Disclosed herein are an apparatus and method for detecting an upstream RF signal based on a preamble. The apparatus for detecting an upstream RF signal based on a preamble includes an analog-to-digital converter unit for receiving an RF analog signal and converting the same into an RF digital signal; a down-converter unit for converting the RF digital signal into a baseband digital signal; a packet detection unit for performing packet detection by performing an operation on the baseband digital signal and preset differential preamble signals; and a timing calculation unit for generating timing information of a terminal device based on the baseband digital signal and time information generated through the packet detection.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: September 24, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sang-Jung Ra, Jin-Hyuk Song, Ho-Sook Lee, Dong-Joon Choi, Joon-Young Jung, Nam-Ho Hur
  • Publication number: 20180167902
    Abstract: Disclosed herein are an apparatus and method for detecting an upstream RF signal based on a preamble. The apparatus for detecting an upstream RF signal based on a preamble includes an analog-to-digital converter unit for receiving an RF analog signal and converting the same into an RF digital signal; a down-converter unit for converting the RF digital signal into a baseband digital signal; a packet detection unit for performing packet detection by performing an operation on the baseband digital signal and preset differential preamble signals; and a timing calculation unit for generating timing information of a terminal device based on the baseband digital signal and time information generated through the packet detection.
    Type: Application
    Filed: November 21, 2017
    Publication date: June 14, 2018
    Inventors: Sang-Jung Ra, Jin-Hyuk Song, Ho-Sook Lee, Dong-Joon Choi, Joon-Young Jung, Nam-Ho Hur
  • Patent number: 9167309
    Abstract: A method for transmitting broadcast and data streams in an HFC-based cable network includes a first transmission step of a broadcast transmission apparatus sending broadcast and data service streams in an IP-based stream or RF signal form through an optical section up to a cell node that is a contact point between the optical section and a cable section of a cable network and a second transmission step of the cell node converting the broadcast and data service streams into one of RF signal, IP-based stream, and RF/IP convergence service stream forms depending on a service type of a subscriber terminal and sending the converted broadcast and data service streams to the subscriber terminal through the cable section.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: October 20, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Ho Sook Lee, Dong Joon Choi, Nam Ho Hur
  • Patent number: 8799497
    Abstract: Provided is an IP network-based headend system. The headend system may obtain service flow information pre-registered in a subscriber modem device, may transmit, to a service supply server connected based on an IP network, the pre-registered service flow information and the network protocol packet, may determine a data reception route determined by the service supply server, may receive, from the service supply server, a video data stream to perform data processing, may receive data processed video data stream, and may transmit the data processed video data stream to the subscriber modem device based on the pre-registered service flow information.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: August 5, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Ho-Sook Lee
  • Publication number: 20140215530
    Abstract: A method for transmitting broadcast and data streams in an HFC-based cable network includes a first transmission step of a broadcast transmission apparatus sending broadcast and data service streams in an IP-based stream or RF signal form through an optical section up to a cell node that is a contact point between the optical section and a cable section of a cable network and a second transmission step of the cell node converting the broadcast and data service streams into one of RF signal, IP-based stream, and RF/IP convergence service stream forms depending on a service type of a subscriber terminal and sending the converted broadcast and data service streams to the subscriber terminal through the cable section.
    Type: Application
    Filed: August 1, 2013
    Publication date: July 31, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Ho Sook LEE, Dong Joon CHOI, Nam Ho HUR
  • Patent number: 8743897
    Abstract: The processing of a multicast service flow for a headend cable modem by classifying an inputted multicast packet by a session composing an internal header including multicast service flow information allocated to the classified session and then outputting an internal multicast packet including the internal header.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: June 3, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho-Sook Lee, O Hyung Kwon, Soo In Lee
  • Patent number: 8472442
    Abstract: A method and apparatus of classifying downstream service flows for a cable modem is provided. A method of classifying downstream service flows, the method including: classifying a service flow based on a Quality of Service (QoS) using a destination address of an inputted packet; composing an internal header including corresponding service flow information based on the classifying of the service flow; and adding the internal header to the inputted packet.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: June 25, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho-Sook Lee, Hye Ju Oh, Dong Joon Choi, O Hyung Kwon, Soo In Lee
  • Publication number: 20120124628
    Abstract: A mobile terminal constituting a multi-screen service environment in a switched digital video (SDV)-based video transmission system structure serves like a remote controller of a reception terminal having a large screen such as a TV. A broadcast channel viewed in the mobile terminal can be shared with the large screen of the TV or the like, and a program can be directly viewed in the large screen of the TV or the like based on program guide information received by the mobile terminal.
    Type: Application
    Filed: November 10, 2011
    Publication date: May 17, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Soon Choul KIM, Dong Joon CHOI, Ho Sook LEE, Soo In LEE
  • Publication number: 20110228775
    Abstract: A method and apparatus of processing a multicast service flow for a headend cable modem is provided. The method of processing the multicast service flow includes: classifying an inputted multicast packet by a session; composing an internal header including multicast service flow information allocated to the classified session; and outputting an internal multicast packet including the internal header.
    Type: Application
    Filed: May 31, 2011
    Publication date: September 22, 2011
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Ho-Sook LEE, O. Hyung KWON, Soo In LEE
  • Patent number: 7974283
    Abstract: A method and apparatus of processing a multicast service flow for a headend cable modem is provided. The method of processing the multicast service flow includes: classifying an inputted multicast packet by a session; composing an internal header including multicast service flow information allocated to the classified session; and outputting an internal multicast packet including the internal header.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: July 5, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho-Sook Lee, O Hyung Kwon, Soo In Lee
  • Publication number: 20110154424
    Abstract: A video stream transmission apparatus is provided. The video stream transmission apparatus may register an information flow path through which an Internet Protocol (IP)-based data packet is received from an IP network based on snooping information that is received through a cable modem termination device from at least one subscriber terminal, may receive the IP-based data packet directly from an information supply device through the registered information flow path, and may transmit the received IP-based data packet to a Hybrid Fiber Coax (HFC)-based cable network.
    Type: Application
    Filed: September 20, 2010
    Publication date: June 23, 2011
    Applicant: Electronics and Telecommunications Research Institute
    Inventor: Ho-Sook Lee
  • Publication number: 20110153859
    Abstract: Provided is an IP network-based headend system. The headend system may obtain service flow information pre-registered in a subscriber modem device, may transmit, to a service supply server connected based on an IP network, the pre-registered service flow information and the network protocol packet, may determine a data reception route determined by the service supply server, may receive, from the service supply server, a video data stream to perform data processing, may receive data processed video data stream, and may transmit the data processed video data stream to the subscriber modem device based on the pre-registered service flow information.
    Type: Application
    Filed: October 18, 2010
    Publication date: June 23, 2011
    Applicant: Electronics and Telecommunications Research Institute
    Inventor: Ho-Sook LEE
  • Patent number: 7912050
    Abstract: Provided is a method for classifying packets in a cable modem termination system (CMTS) supporting a channel bonding mode.
    Type: Grant
    Filed: November 21, 2007
    Date of Patent: March 22, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho Sook Lee, Dong Joon Choi, O Hyung Kwon, Soo In Lee
  • Publication number: 20100162337
    Abstract: Provided is an apparatus and method for providing a video service flow using a dual scheduler for a headend cable modem in a Hybrid Fiber Coax (HFC) network. The apparatus may include: a service flow processing unit to determine whether a packet corresponds to a registered video service flow, when the packet is received; and at least one channel transmitter to schedule a packet corresponding to the registered video service flow and a packet not corresponding to the registered video service flow so that a transmission rate of the registered video service flow is guaranteed, and to thereby transmit the packets.
    Type: Application
    Filed: August 25, 2009
    Publication date: June 24, 2010
    Inventors: Ho-Sook LEE, O Hyung KWON, Soo In LEE
  • Publication number: 20090147788
    Abstract: A method and apparatus of classifying downstream service flows for a cable modem is provided. A method of classifying downstream service flows, the method including: classifying a service flow based on a Quality of Service (QoS) using a destination address of an inputted packet; composing an internal header including corresponding service flow information based on the classifying of the service flow; and adding the internal header to the inputted packet.
    Type: Application
    Filed: August 8, 2008
    Publication date: June 11, 2009
    Inventors: Ho-Sook LEE, Hye Ju OH, Dong Joon CHOI, O Hyung KWON, Soo In LEE
  • Publication number: 20090147781
    Abstract: A method and apparatus of processing a multicast service flow for a headend cable modem is provided. The method of processing the multicast service flow includes: classifying an inputted multicast packet by a session; composing an internal header including multicast service flow information allocated to the classified session; and outputting an internal multicast packet including the internal header.
    Type: Application
    Filed: August 13, 2008
    Publication date: June 11, 2009
    Inventors: Ho-Sook LEE, O Hyung KWON, Soo In LEE
  • Publication number: 20090147681
    Abstract: A method and apparatus of controlling a downstream service flow is provided. A method of controlling a downstream service flow, the method including: receiving a control request with respect to a service flow; generating classifier information for identifying a Quality of Service (QoS) classification standard of the service flow for which a generation request is performed, and registering the generated classifier information in a table when the control request is the generation request for the service flow; registering a pattern mask corresponding to the classifier information in the table; and composing the table for searching for downstream service flow information of a downstream input packet using the classifier information and the pattern mask.
    Type: Application
    Filed: August 7, 2008
    Publication date: June 11, 2009
    Inventors: Ho-Sook LEE, O Hyung KWON, Soo In LEE
  • Patent number: 7502328
    Abstract: Provided is a method of monitoring link performance and diagnosing an active link state without interrupting traffic in an Ethernet passive optical network (EPON) while the link is in the active state.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: March 10, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho Sook Lee, Jee Sook Eun, Tae Whan Yoo, Bong Tae Kim
  • Patent number: 7443861
    Abstract: A method of controlling data transmission in an Ethernet passive optical network (EPON) and an apparatus thereof are provided. Transmission permission messages using a mode of bandwidth allocation are queued in a queuing unit according to the types of the transmission permission messages. A transmission time duration of upstream data is defined for each of the transmission permission messages queued in the queuing unit. A bandwidth allocation unit generates transmission permission messages to allocate upstream data transmission bandwidth for an optical network unit (ONU), based on the transmission permission messages stored in the storage unit. A scheduler designates the predetermined priority, reads transmission permission messages from queues according to a predetermined priority, determines a transmission start time of upstream data, and outputs the transmission permission messages.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: October 28, 2008
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho Sook Lee, Tae Whan Yoo, Hyeong Ho Lee
  • Publication number: 20080130641
    Abstract: Provided is a method for classifying packets in a cable modem termination system (CMTS) supporting a channel bonding mode.
    Type: Application
    Filed: November 21, 2007
    Publication date: June 5, 2008
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Ho Sook LEE, Dong Joon CHOI, O Hyung KWON, Soo In LEE