Patents by Inventor Hyeong-Ho Lee

Hyeong-Ho 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: 9526107
    Abstract: An apparatus, system and method for managing radio resources are disclosed. The apparatus for managing radio resources includes a media independent services (MIS) user unit, a link layer unit, and a media independent services function (MISF) unit. The link layer unit outputs its own link status and radio resource allocation status. The MISF unit receives a report on the link status and radio resource allocation status from the link layer unit, receives a report on link status of a terminal from the corresponding terminal, receives a report on link status and radio resource allocation status of a neighboring Point of Attachment (PoA) from the corresponding neighboring PoA, and receives network configuration information from a network configuration information server. The MIS user unit determines to change radio resource allocation based on information from any one of the link layer unit, the terminal, the neighboring PoA and the network configuration information server.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: December 20, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyunho Park, Hyeong Ho Lee
  • Patent number: 9504074
    Abstract: The present invention relates to a method of providing proximity service communication between terminals. In accordance with an embodiment, a first terminal makes connection to a second terminal with network assistance. The first terminal requests information required to search for the second terminal from a network management server. The network management server determines a communication mode for proximity service communication. The network management server transmits a request message requesting communication between the first terminal and the second terminal in the communication mode to the first and second terminals. In accordance with another embodiment, a first terminal may switch its proximity service communication technology for better QoS without network assistance. The first terminal monitors link status. If the link status is deteriorated, the first terminal requests a second terminal to change proximity service communication technology.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: November 22, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyunho Park, Hyeong Ho Lee
  • Patent number: 9307470
    Abstract: Single radio handovers (SRHOs) between heterogonous networks can be facilitated using several techniques. One such technique includes activating a receiver of a target radio interface in a mobile node without activating a transmitter of the target radio interface, thereby allowing the mobile node to perform target network discovery while the transmitter of the target radio interface remains deactivated. Another such technique includes encapsulating link-layer discovery frames into media independent handover frames (MIH), and then tunneling the MIH frames over a tunnel extending through the source network. This may allow the MN to achieve various handover related tasks without activating the target radio link. Another technique includes establishing a schedule (or delay period) for synchronizing deactivation of the source radio interface with activation of the transmitter in the target radio interface.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: April 5, 2016
    Assignees: Futurewei Technologies, Inc., Electronics and Telecommunications Research Institute
    Inventors: Hinghung Anthony Chan, Hyunho Park, Hyeong Ho Lee
  • Publication number: 20150124715
    Abstract: An apparatus, system and method for managing radio resources are disclosed. The apparatus for managing radio resources includes a media independent services (MIS) user unit, a link layer unit, and a media independent services function (MISF) unit. The link layer unit outputs its own link status and radio resource allocation status. The MISF unit receives a report on the link status and radio resource allocation status from the link layer unit, receives a report on link status of a terminal from the corresponding terminal, receives a report on link status and radio resource allocation status of a neighboring Point of Attachment (PoA) from the corresponding neighboring PoA, and receives network configuration information from a network configuration information server. The MIS user unit determines to change radio resource allocation based on information from any one of the link layer unit, the terminal, the neighboring PoA and the network configuration information server.
    Type: Application
    Filed: June 25, 2014
    Publication date: May 7, 2015
    Inventors: Hyunho PARK, Hyeong Ho LEE
  • Publication number: 20140273850
    Abstract: The present invention relates to a method of providing proximity service communication between terminals. In accordance with an embodiment, a first terminal makes connection to a second terminal with network assistance. The first terminal requests information required to search for the second terminal from a network management server. The network management server determines a communication mode for proximity service communication. The network management server transmits a request message requesting communication between the first terminal and the second terminal in the communication mode to the first and second terminals. In accordance with another embodiment, a first terminal may switch its proximity service communication technology for better QoS without network assistance. The first terminal monitors link status. If the link status is deteriorated, the first terminal requests a second terminal to change proximity service communication technology.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 18, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyunho PARK, Hyeong Ho LEE
  • Patent number: 8730908
    Abstract: A conventional handover method is performed in units of base stations, so that there is a problem in that a large amount of power for handover is consumed and implementation cost is high. Through dedicated protocol message exchanges between a user equipment and a network or between networks, resource availability of candidate networks is checked in advance, a handover target network is selected from among the candidate networks according to a result of checking, and the selected target network is designated as a network to which the user equipment is handed over.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: May 20, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Junghoon Jee, Heeyoung Jung, Hyeong-Ho Lee, Eunah Kim, Hong-Seok Jeon
  • Publication number: 20140016613
    Abstract: Single radio handovers (SRHOs) between heterogonous networks can be facilitated using several techniques. One such technique includes activating a receiver of a target radio interface in a mobile node without activating a transmitter of the target radio interface, thereby allowing the mobile node to perform target network discovery while the transmitter of the target radio interface remains deactivated. Another such technique includes encapsulating link-layer discovery frames into media independent handover frames (MIH), and then tunneling the MIH frames over a tunnel extending through the source network. This may allow the MN to achieve various handover related tasks without activating the target radio link. Another technique includes establishing a schedule (or delay period) for synchronizing deactivation of the source radio interface with activation of the transmitter in the target radio interface.
    Type: Application
    Filed: July 9, 2013
    Publication date: January 16, 2014
    Inventors: Hinghung Anthony Chan, Hyunho Park, Hyeong Ho Lee
  • Patent number: 8089931
    Abstract: Provided is a fast handover method using candidate care-of addresses (CoAs). The method includes obtaining Internet protocol (IP) address information of access routers located adjacent to a previous access router (PAR) to which a mobile node is connected; setting more than one candidate CoAs based on the IP address information; and selecting from the more than one candidate CoAs a CoA of a sub-net to which the mobile node is to move and performing a handover based on the selected CoA. Therefore, a delay and a packet loss caused by the setting of a new NCoAs can be prevented.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: January 3, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jung Hoon Jee, Hong Seock Jeon, Jong Hwa Yi, Hyeong Ho Lee
  • Patent number: 7844011
    Abstract: An apparatus and method for improving a symbol error rate of an M-ary phase shift keying (M-PSK) system having a quadrature error are provided. The apparatus includes: a conversion parameter detector that detects a conversion parameter and converts a symbol decision region using the quadrature error and at least one pair of first received symbols; and a converter & determiner converting a pair of second received symbols using the detected conversion parameter, and determining a transmission symbol according to a symbol of the converted pair of second received symbols. An increase in a symbol error rate due to the quadrature error can be prevented and the quadrature error can be easily estimated.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: November 30, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Keun Park, Jin A Park, Pyung Dong Cho, Hyeong Ho Lee
  • Patent number: 7817568
    Abstract: Provided are a method for measuring characteristics of a path between nodes by using active testing packets based on priority, i.e., an inter-node path characteristic measuring method, which can measure and provide characteristics of a generated node, when an inter-node data transmission path is generated based on Multi-Protocol Label Switching (MPLS) to provide a path with satisfactory transmission delay, jitter and packet loss that are required by a user, and to provide a computer-readable recording medium for recording a program that implement the method. The method includes the steps of: a) synchronizing system time of the nodes with a global standard time; b) forming each testing packet; c) registering frame sequence and the global standard time during transmission; and d) calculating transmission delay time, jitter and packet loss by using time stamp and packet sequence information of a frame received by the destination node and transmitting the result to the management system.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: October 19, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Euihyun Paik, Tae-Il Kim, Hyeong-Ho Lee
  • Publication number: 20100232306
    Abstract: The present invention relates to a method for supporting Internet Protocol version 6 (IPv6) in a wireless communication system. According to an exemplary embodiment of the present invention, a wireless communication system consists of an access router, a bridge, and a base station. The access router allocates a common network prefix to all subscriber stations served by it. When receiving IP multicast data destined for all nodes on the same link, the access router forwards the data back to the bridge. The bridge transmits IP multicast data with reference to an identification cache table (ICT) which includes MAC addresses of each subscriber stations, identifiers for point-to-point connections between the bridge and base station, IPv6 addresses of each subscriber station and valid flags for the IPv6 addresses. The base station provides point-to-point connections to both the bridge and each of subscriber stations.
    Type: Application
    Filed: August 17, 2007
    Publication date: September 16, 2010
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hong-Seok Jeon, Eun-Ah Kim, Hee-Young Jung, Hyeong-Ho Lee, Jung-Hoon Jee
  • Patent number: 7777629
    Abstract: Provided is an apparatus and method for preventing air baggage from getting lost using a radio frequency identification (RFID) system. The apparatus for preventing baggage from getting lost, change, or stolen in which a baggage tag storing baggage management information is attached to the baggage and a receipt tag storing the baggage management information is issued to a baggage owner, the apparatus includes: a tag reader reading the receipt tag and the baggage tag in a predetermined area; and a determiner determining whether the tag reader reads the receipt tag including the same baggage management information as the baggage management information of the baggage tag within a predetermined time before and after the tag reader reads the baggage tag. As a result, air baggage is quickly and exactly managed, costs is reduced, and foreign confidence of an airport is increased, thereby preventing baggage from getting lost and exchanged.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: August 17, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jun Seob Lee, Yong Woon Kim, Sang Keun Yoo, Hyoung Jun Kim, Hyeong Ho Lee
  • Patent number: 7756001
    Abstract: An apparatus for and method of deciding symbols in a M-ary phase shift keying (MPSK) system are provided. The apparatus includes: a linear transform unit performing linear transform, to which a phase error is applied, of a received pair of symbols; and a symbol decision unit deciding a transmitted symbol corresponding to the received pair of symbols according to the sign value of the transformed symbol pair. According to the apparatus and method, degradation of a symbol error rate caused by a phase error when an MPSK signal is demodulated can be improved and a phase error can be estimated through a simple method.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: July 13, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin A Park, Seung Keun Park, Pyung Dong Cho, Hyeong Ho Lee
  • Patent number: 7704682
    Abstract: The method of manufacturing the optical fiber having the Bragg grating includes the steps of applying heat from a heat source to a predetermined portion of the optical fiber and thus diffusing impurities existing in a core of the optical fiber into a cladding of the optical fiber, so as to adjust an effective refractive index for a guided mode in the fiber corresponding to a predetermined wavelength, exposing UV light from an optical source to a phase mask having a periodic surface relief structure, and fabricating the Bragg grating having a predetermined period in the optical fiber using diffraction and interference of the UV light due to the periodic surface relief structure of the phase mask.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: April 27, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung-Hyun Cho, Byoungwhi Kim, Hyeong-Ho Lee
  • Patent number: 7633866
    Abstract: A data transmission system in an EPON includes a parser classifying frames generated in each block, and transmitting the frames to a block. A scheduler performs multiplexing of frames, then, during a transmission time permitted by an OLT, determines a transmission sequence of the frames and transmits the frames. A MPCP slave processes messages transmitted from the OLT, generates response messages on the transmitted messages, and maintains time synchronization with the OLT A processor interface conveys frames transmitted from the OLT to a processor, frames primitives transmitted from the processor, and transmits the primitives to the OLT. A register stores a value used during generation of frames in each block, a value for system control, and a value acquired from MPCP control frames.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: December 15, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kyeong-Soo Han, Tae-Whan Yoo, Hyeong-Ho Lee
  • Patent number: 7630340
    Abstract: In a handover method, a mobile node receives a Layer 2 trigger message; requests information on Layer 3 of a new access router (NAR) from a previous access router (PAR) by using information included in the Layer 2 trigger message and information on an IP address of the NAR and a new Care of Address (NCoA) to be used when moving to the NAR; and performs registration with a Home Agent (HA) of the mobile node and sending binding update to an associated correspondence node by using the NCoA when a Layer 2 handover is occurred. With this configuration, the present invention provides a handover method automatically creating an address using a MAC (Medical access control) address in the mobile IPv6 (Internet Protocol version 6).
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: December 8, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hee-Young Jung, Jong-Hwa Lee, Hyeong-Ho Lee
  • Patent number: 7613187
    Abstract: Disclosed herein is a shared Local Area Network (LAN) emulation method and apparatus. The method includes the following four steps. At the first step, a Logical Link Identifier (LLID) management table is set up to assign unique LLIDs to a plurality of Optical Network Units (ONUs) and manage the assigned LLIDs so as to identify the plurality of ONUs connected to a single Optical Line Terminal (OLT). Thereafter, a MAC address table is set up for the LLIDs to learn MAC addresses of the ONUs. Thereafter, the unique LLIDs are assigned to ONUs when the ONUs request registration from the OLT. Finally, data frames, which are received by a Shared LAN Emulation (SLE) layer of the OLT, are bridged using the LLIDs, VIDs of Virtual LANs to which the ONUs belong and destination MAC addresses of the data frames so as to provide a single matched port between a Logical Link Control (LLC) layer and a MAC layer of the OLT.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: November 3, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Su Il Choi, Tae Il Kim, Hyeong Ho Lee
  • Patent number: 7610608
    Abstract: Provided is a digital broadcast system that receives digital broadcast services on a passive optical network (PON). The data separator separates a signal input thereinto from the outside into an Ethernet frame for data service and an Ethernet frame for digital broadcast service. The Ethernet switch transmits the Ethernet frame for data service to an optical network terminal (ONT) provided in the user's home according to header information of the Ethernet frame for data service. The channel request processor receives the user's channel selection request information and user identification (ID) information from the ONT. The digital broadcast processor transmits the Ethernet frame for digital broadcast service, corresponding to the digital broadcast channel selected by the user, to the user's ONT, by using a part of bandwidth assigned for an existing line.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: October 27, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yongtae Kim, Kang Bok Lee, Heyung Sub Lee, Hyeong Ho Lee
  • Patent number: 7599411
    Abstract: A PLC-based wavelength-tunable WDM-PON system with an optical wavelength alignment function, the WDM-PON system comprises: a PLC platform formed on a silicon substrate; a semiconductor chip comprising an active region generating light and a passive region located in front of the active region for vertically coupling the light generated in the active region; a planar lightwave circuit (PLC) waveguide; one portion of a PLC platform where the semiconductor chip is surface mounted; waveguide Bragg grating (WBG) formed at a predetermined location of the PLC waveguide; a directional coupler transferring an optical power by permitting the passive region to approach the PLC waveguide; a heater terminal, which is formed on the WBG; and a V-groove for attaching an optical fiber to another end of the PLC waveguide. Accordingly, a WDM-PON system having a function of realizing a cost-effective optical wavelength alignment can be provided.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: October 6, 2009
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byoung Whi Kim, Jae Dong Park, Hyeong Ho Lee, Jae Woo Yang
  • Patent number: RE48618
    Abstract: Provided is a radio frequency transceiver. The radio frequency transceiver includes: a receiving unit for converting a radio frequency signal received by an antenna into an intermediate signal based on an intermediate local signal; a transmitting unit for converting an intermediate signal into a radio frequency signal based on a radio frequency local signal; and a local signal generating unit for generating the intermediate local signal and the radio frequency local signal.
    Type: Grant
    Filed: July 3, 2019
    Date of Patent: June 29, 2021
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Bong-Hyuk Park, Jong-Won Kim, Yong-Il Jun, Hyeong-Ho Lee