Patents by Inventor Sok Kyu Lee

Sok Kyu 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).

  • METHOD FOR TRANSMITTING A RESPONSE REQUEST FRAME AND A RESPONSE FRAME IN A MULTI-USER BASED WIRELESS COMMUNICATION SYSTEM
    Publication number: 20190174484
    Abstract: The present invention relates to a method for efficient transmission of a request frame such as an RTS/CTS frame and a response frame in response to the request frame in a multi-user based wireless communication system. The method of the present invention comprises: a process where wireless terminals transmit a response frame at their own response frame transmission time through a request frame that contains information about a plurality of wireless terminals and information about the response frame transmission time of the respective wireless terminals; a process where the respective wireless terminals transmit a response frame according to a token scheme such that the response frame is transmitted to a final access point; and a process where only a representative wireless terminal selected depending on a given wireless environment receives the response frame.
    Type: Application
    Filed: January 22, 2019
    Publication date: June 6, 2019
    Inventors: Yun Joo KIM, Jee Yon CHOI, Sok-Kyu LEE
  • Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof
    Patent number: 10313927
    Abstract: In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: June 4, 2019
    Inventors: Hee-Jung Yu, Taehyun Jeon, Myung-Soon Kim, Eun-Young Choi, Sok-kyu Lee, Deuk-Su Lyu
  • Nonvolatile memory device, data storage device and operating method thereof
    Patent number: 10310741
    Abstract: A nonvolatile memory device includes a target memory area; a control unit configured to apply a program pulse one or more times to the target memory area in response to a program command, until program verification passes; and a status storage unit configured to store a program status information for the target memory area, wherein the control unit is supplied with a first operation voltage, and the status storage unit is supplied with a second operation voltage.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: June 4, 2019
    Assignee: SK hynix Inc.
    Inventor: Sok Kyu Lee
  • METHOD FOR RECOVERING A FRAME THAT FAILED TO BE TRANSMITTED IN A MU-MIMO BASED WIRELESS COMMUNICATION SYSTEM
    Publication number: 20190165839
    Abstract: A method and apparatus of transmitting in a wireless communication system is provided. A transmitter generates a group management frame including a group information and position information and a data frame including a group control information having a group identifier for each of a plurality of groups. The group information indicates whether the receiver is a member of each of the plurality of groups. The position information indicates a position of at least one stream corresponding to at least one group of which the receiver is a member.
    Type: Application
    Filed: January 10, 2019
    Publication date: May 30, 2019
    Inventors: Yun-Joo KIM, Jae-Seung LEE, Sok-Kyu LEE
  • Method for changing operating mode of wireless LAN system and wireless LAN system
    Patent number: 10306557
    Abstract: An operating mode change method of a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting, by a station (STA) to an access point (AP), an operating mode change request frame comprising at least one of information on a change of a traffic indication map (TIM) mode, a request for a change of a power save parameter, and information on a change of a service type of the STA, receiving, from the AP, an operating mode change response frame comprising at least one of a TIM mode allowed by the AP, a reallocated association identification (AID), and information on a changed power save parameter, and performing at least one of the change of the TIM mode and the change of the power save parameter based on the information included in the operating mode change.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: May 28, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jae Seung Lee, Hyoung Jin Kwon, Min Ho Cheong, Hee Jung Yu, Sok Kyu Lee
  • SCANNING METHOD IN WIRELESS LAN SYSTEM AND SUPPORTING DEVICE THEREFOR
    Publication number: 20190150078
    Abstract: A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame.
    Type: Application
    Filed: January 10, 2019
    Publication date: May 16, 2019
    Inventors: Jae Seung LEE, Min Ho CHEONG, Hyoung Jin KWON, Hee Jung YU, Sok Kyu LEE
  • STORAGE DEVICE AND OPERATING METHOD THEREOF
    Publication number: 20190121741
    Abstract: There are provided a memory controller for controlling a memory device to perform a more stable sensing operation, a storage device including the memory controller, and an operating method of the storage device. A memory controller includes: a processor for transmitting a cache read command to a memory device and then transmitting a status read command to the memory device; and a cache read controller for outputting a data-out command to the memory device according to a sensing section code included in a status read response transmitted by the memory device in response to the status read command.
    Type: Application
    Filed: May 23, 2018
    Publication date: April 25, 2019
    Inventor: Sok Kyu LEE
  • Transmitter and method for transmitting data block in wireless communication system
    Patent number: 10270568
    Abstract: Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: deciding the number of bits (s) and encoders (NES) to allocate to one axis of a signal constellation; encoding an information bit based on the s and the NES and generating a coded block; parsing the coded block based on the s and the NES and generating a plurality of frequency sub-blocks; and transmitting the plurality of frequency sub-blocks to a receiver.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: April 23, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Ee Oh, Min Ho Cheong, Sok Kyu Lee
  • Preamble configuring method in the wireless LAN system, and a method for a frame synchronization
    Patent number: 10257011
    Abstract: A method of configuring a preamble of a downlink frame for synchronization in data frame transmission of a 60 GHz wireless local area network system, the method comprising arranging a short preamble having a plurality of repetitive S symbols, and an IS symbol, and arranging a long preamble having a long cyclic prefix (CP) and a plurality of L symbols for frame synchronization and symbol timing by performing auto-correlation according to the length of window of the auto-correlation.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: April 9, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Woo-Yong Lee, Sok-Kyu Lee
  • METHOD AND APPARATUS FOR WIRELESS COMMUNICATION BASED ON FREQUENCY SELECTIVE TRANSMISSION IN WIRELESS LOCAL AREA NETWORK
    Publication number: 20190104531
    Abstract: Disclosed are a wireless communication method, and an access point and a station which perform the wireless communication method. A wireless communication method performed by an access point according to an embodiment may include performing channel sounding on a plurality of subchannels, identifying subchannels selected by stations among the subchannels, scheduling communications between the AP and the stations based on the selected subchannels, and transmitting a data frame to the stations through the subchannels based on a scheduling result.
    Type: Application
    Filed: November 14, 2018
    Publication date: April 4, 2019
    Inventors: Hyoung Jin KWON, Sok Kyu LEE, Jae Seung LEE, Min Ho CHEONG
  • Method of transmitting and receiving frame for uplink multi-user multiple-input and multiple-output (UL MU-MIMO) communication
    Patent number: 10250304
    Abstract: Provided is a method of transmitting and receiving a frame for a multi-user multiple-input and multiple-output (MU-MIMO) communication in an access point (AP), the method including determining at least one transmission station (STA), transmitting, to the transmission STA, an uplink multi-user poll (UL MU poll) frame requesting a data frame, receiving the data frame from the at least one transmission STA simultaneously, and transmitting an acknowledgement (ACK) frame to the at least one transmission STA in response to the receiving.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: April 2, 2019
    Assignee: ELECTRONIC AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jee Yon Choi, Hyoung Jin Kwon, Je Hun Lee, Sok Kyu Lee
  • Method for transmitting a response request frame and a response frame in a multi-user based wireless communication system
    Patent number: 10231218
    Abstract: The present invention relates to a method for efficient transmission of a request frame such as an RTS/CTS frame and a response frame in response to the request frame in a multi-user based wireless communication system. The method of the present invention comprises: a process where wireless terminals transmit a response frame at their own response frame transmission time through a request frame that contains information about a plurality of wireless terminals and information about the response frame transmission time of the respective wireless terminals; a process where the respective wireless terminals transmit a response frame according to a token scheme such that the response frame is transmitted to a final access point; and a process where only a representative wireless terminal selected depending on a given wireless environment receives the response frame.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: March 12, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yun Joo Kim, Jee Yon Choi, Sok-Kyu Lee
  • Method for recovering a frame that failed to be transmitted in a MU-MIMO based wireless communication system
    Patent number: 10230435
    Abstract: A method and apparatus of transmitting in a wireless communication system is provided. A transmitter generates a group management frame including a group information and position information and a data frame including a group control information having a group identifier for each of a plurality of groups. The group information indicates whether the receiver is a member of each of the plurality of groups. The position information indicates a position of at least one stream corresponding to at least one group of which the receiver is a member.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: March 12, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yun-Joo Kim, Jae-Seung Lee, Sok-Kyu Lee
  • Scanning method in wireless LAN system and supporting device therefor
    Patent number: 10225792
    Abstract: A scanning method performed by a station (STA) in a wireless LAN system is provided. The method comprises: transmitting a probe request frame; and receiving a short probe response frame from an access point (AP) as a response to the probe request frame. The short probe response frame includes service set ID (SSID) information or compressed SSID information of the AP.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: March 5, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jae Seung Lee, Min Ho Cheong, Hyoung Jin Kwon, Hee Jung Yu, Sok Kyu Lee
  • Apparatus and method for channel access
    Patent number: 10219298
    Abstract: A channel access method of an access point (AP) having a sector antenna in a wireless local access network (WLAN) includes transmitting a sector beacon with respect to any one sector among a plurality of sectors, transmitting and receiving data with at least one station in any one sector during a pre-scheduled sector interval, sequentially performing transmission of the sector beacon and transmission and reception of the data with respect to remaining sectors of the plurality of sectors excluding the any one sector, transmitting an omni beacon with respect to all of the plurality of sectors, and transmitting and receiving data with respect to at least one station of the plurality of sectors during a pre-scheduled Basic Service Set (BSS) interval.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: February 26, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Min Ho Cheong, Hyoung Jin Kwon, Jae Seung Lee, Jae Woo Park, Sok Kyu Lee
  • METHOD AND APPARATUS FOR DISCOVERY OF SECTOR IN WIRELESS LOCAL AREA NETWORK SYSTEM
    Publication number: 20190021041
    Abstract: Provided is a sector discovery apparatus and method, the method including setting, by an AP in a WLAN system, an omni-beacon interval for transmitting an omnidirectional beacon and sector beacon intervals for transmitting a sector beacon with respect to one of a plurality of sectors which are spatially divided, transmitting the sector beacon to a current sector among the plurality of sectors, transmitting, to the current sector, a transmission frame indicating sectorized transmission or a transmission frame indicating omnidirectional transmission, in a sector interval between the sector beacon intervals, and receiving, from a terminal located in the current sector, a response frame indicating an association performed by receiving the transmission frame indicating the sectorized transmission
    Type: Application
    Filed: September 6, 2018
    Publication date: January 17, 2019
    Inventors: Jae Seung LEE, Min ho CHEONG, Hyoung Jin KWON, Jae Woo PARK, Sok Kyu LEE
  • METHOD AND APPARATUS FOR TRANSCEIVING DATA IN A MIMO SYSTEM
    Publication number: 20190007111
    Abstract: The present invention relates to a method and apparatus for transceiving data. A method in which a transmitting terminal transmits data to a receiving terminal in a MIMO system according to one embodiment of the present invention comprises the following steps: generating a data field containing the data; generating a signal field containing information on the data field; generating a data frame containing the data field and the signal field; and transmitting the data frame to the receiving terminal. According to the present invention, an end of the frame being transmitted is accurately notified to the receiving terminal in a communication system in which the frame is transmitted using MIMO, thereby decoding the frame in a more efficient manner at the receiving terminal.
    Type: Application
    Filed: September 5, 2018
    Publication date: January 3, 2019
    Inventors: Jae Woo PARK, Jong Ee OH, Il-Gu LEE, Sok-Kyu LEE, Min Ho CHEONG, Jee Yon CHOI, Jae Seung LEE, Yun Joo KIM
  • PACKET MODE AUTO-DETECTION IN MULTI-MODE WIRELESS COMMUNICATION SYSTEM, SIGNAL FIELD TRANSMISSION FOR THE PACKET MODE AUTO-DETECTION, AND GAIN CONTROL BASED ON THE PACKET MODE
    Publication number: 20180375701
    Abstract: A method for automatically detecting a packet mode in a wireless communication system supporting a multiple transmission mode includes: acquiring at least one of data rate information, packet length information and channel bandwidth information from a transmitted frame; and determining the packet mode on the basis of the phase rotation check result of a symbol transmitted after a signal field signal and at least one of the data rate information, the packet length information and the channel bandwidth information acquired from the transmitted frame.
    Type: Application
    Filed: July 31, 2018
    Publication date: December 27, 2018
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: IL-Gu LEE, Eun-Young CHOI, Sok-Kyu LEE
  • Communication based on frequency selective transmission in wireless local area network
    Patent number: 10165584
    Abstract: Disclosed are a wireless communication method, and an access point and a station which perform the wireless communication method. A wireless communication method performed by an access point according to an embodiment may include performing channel sounding on a plurality of subchannels, identifying subchannels selected by stations among the subchannels, scheduling communications between the AP and the stations based on the selected subchannels, and transmitting a data frame to the stations through the subchannels based on a scheduling result.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: December 25, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyoung Jin Kwon, Sok Kyu Lee, Jae Seung Lee, Min Ho Cheong
  • Apparatus and method for estimating channel in wireless local area network (WLAN) system
    Patent number: 10148478
    Abstract: A method and apparatus for estimating a channel in a wireless local area network (WLAN) are provided. A channel estimation apparatus may include a channel estimation information combiner to combine at least one channel estimation information based on a difference between cyclic delay diversity (CDD) values, and a phase applier to generate a first phase value and to apply the first phase value to the combined channel estimation information.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 4, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Chang Wahn Yu, Hee Soo Lee, Sok Kyu Lee