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 AND APPARATUS FOR ALLOCATING FLEXIBLE TRANSMISSION SLOT IN WIRELESS LAN SYSTEM
    Publication number: 20150173015
    Abstract: A method and an apparatus for allocating a flexible transmission slot in a wireless local area network (LAN) system are disclosed. A flexible transmission slot allocation method of an access point (AP) in a wireless local area network (WLAN) system according to an exemplary embodiment includes transmitting a beacon including a traffic indication map (TIM) bit to a station, receiving a power save poll (PS-Poll) from the station in a slot implicitly allocated by the TIM bit, and transmitting an acknowledgement (ACK) including transmission slot allocation information on downlink data to the station.
    Type: Application
    Filed: July 10, 2013
    Publication date: June 18, 2015
    Applicant: Electronics and Telecommunications Research Instit
    Inventors: Jae Seung Lee, Mln Ho Cheong, Hyoung Jin Kwon, Hee Jung Yu, Jae Woo Park, Sok Kyu Lee
  • METHOD FOR CHANGING OPERATING MODE OF WIRELESS LAN SYSTEM AND WIRELESS LAN SYSTEM
    Publication number: 20150173014
    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 response frame.
    Type: Application
    Filed: June 13, 2013
    Publication date: June 18, 2015
    Inventors: Jae Seung Lee, Hyoung Jin Kwon, Min Ho Cheong, Hee Jung Yu, Sok Kyu Lee
  • COMMUNICATION METHOD AND COMMUNICATION DEVICE IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTI-BANDWIDTH
    Publication number: 20150173077
    Abstract: Provided is an apparatus and method for communication in a wireless local area network (LAN) system supporting a multi-bandwidth in which a communication apparatus supporting a multi-bandwidth includes generating a base frame based on at least one of a first bandwidth having the lowest signal-to-noise ratio (SNR) among predetermined bandwidths and a second bandwidth that is two times greater than the first bandwidth, configuring a duplication mode frame based on the base frame, and transmitting the duplication mode frame through a plurality of bands.
    Type: Application
    Filed: June 13, 2013
    Publication date: June 18, 2015
    Inventors: Hee Jung Yu, Min Ho Cheong, Jae Seung Lee, Hyoung Jin Kwon, Sok Kyu Lee
  • METHOD AND SYSTEM FOR MANAGING CHANNEL IN WIRELESS LOCAL AREA NETWORK
    Publication number: 20150163769
    Abstract: A method and system for managing a channel in a wireless local area network is disclosed. The method includes detecting adjacent access points, transmitting a resource allocation request frame including candidate channel information which the first access points wants to a master access point among the detected adjacent access points, receiving a resource allocation response frame which is a response with respect to the resource allocation request frame from the master access point, and configuring the BSS based on channel related information included in the resource allocation response frame. Accordingly, performance of the wireless local area network can be improved.
    Type: Application
    Filed: December 8, 2014
    Publication date: June 11, 2015
    Inventors: Jae Seung LEE, Hyoung Jin KWON, Min Ho CHEONG, Sok Kyu LEE
  • METHOD AND APPARATUS FOR ALLOCATING CHANNEL IN WIRELESS LOCAL AREA NETWORK
    Publication number: 20150163043
    Abstract: A method and apparatus for allocating a channel in a wireless local area network (WLAN) is disclosed. The method includes receiving a first frame including scheduling information with respect to a first interval from a second access point, generating a second frame including resource related information required for transmission and reception during a second interval which is continuous to the first interval, and transmitting the second frame to the second access point. Accordingly, performance of the WLAN can be improved.
    Type: Application
    Filed: December 4, 2014
    Publication date: June 11, 2015
    Inventors: Jae Seung LEE, Hyoung Jin KWON, Min Ho CHEONG, Sok Kyu LEE
  • COMMUNICATION METHOD AND COMMUNICATION DEVICE USING OPEN-LOOP LINK IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTI-BANDWIDTH
    Publication number: 20150156788
    Abstract: A communication method and a communication apparatus using an open-loop link in a wireless local area network (WLAN) system supporting a multi-bandwidth are disclosed. A communication method using an open-loop link according to an exemplary embodiment includes a transmission apparatus of a WLAN system to support a multi-bandwidth, receiving link margin information on each of a plurality of bandwidths from a reception apparatus, acquiring a margin for a signal-to-noise ratio (SNR) based on the link margin information and determining a modulation and coding scheme (MCS) and a bandwidth for use based on the margin for the SNR, and transmitting data to the reception apparatus using the determined MCS and bandwidth.
    Type: Application
    Filed: June 13, 2013
    Publication date: June 4, 2015
    Inventors: Hee Jung Yu, Min Ho Cheong, Jae Seung Lee, Hyoung Jin Kwon, Sok Kyu Lee
  • METHODS FOR CHANNEL SOUNDING AND SCHEDULING FOR INTERFERENCE ALIGNMENT IN WIRELESS LOCAL AREA NETWORK
    Publication number: 20150156794
    Abstract: Provided are channel sounding and scheduling methods for interference alignment in a wireless LAN. The sounding method includes transmitting a RTS frame, the RTS frame including an OIA candidate AP list that includes identification information of a plurality of access points, transmitting a CTS-pole frame for triggering transmission of a CTS frame to a second access point which is a first access point in the OIA candidate AP list, and receiving a CTS frame which is a response to the CTS-pole frame from the second access point. Therefore, communication performance of the wireless LAN can be improved.
    Type: Application
    Filed: December 4, 2014
    Publication date: June 4, 2015
    Inventors: Hyoung Jin KWON, Sok Kyu LEE, Jae Seung LEE, Min Ho CHEONG
  • COMMUNICATION METHOD AND COMMUNICATION DEVICE FOR SUPPORTING A PLURALITY OF BASIC BANDWIDTH MODES IN WIRELESS LAN SYSTEM THAT SUPPORTS MULTIPLE BANDWIDTHS
    Publication number: 20150156771
    Abstract: Provided is an apparatus and method for supporting a plurality of basic bandwidth modes in a wireless local area network (WLAN) system supporting a multi-bandwidth, wherein a communication method of an access point (AP) in a WLAN system includes verifying an operational status of a network by an AP included in the network supporting a first bandwidth and a second bandwidth two times greater than the first bandwidth, allocating a first time slot in which a transmission of a frame with at least the first bandwidth is allowed, based on the operational status of the network, and allocating a second time slot in which a transmission of a frame with at least the second bandwidth is allowed, based on the operational status of the network.
    Type: Application
    Filed: July 5, 2013
    Publication date: June 4, 2015
    Inventors: Hee Jung Yu, Min Ho Cheong, Jae Seung Lee, Hyoung Jin Kwon, Sok Kyu Lee
  • APPARATUS AND METHOD FOR PERFORMING VIRTUAL HIBERNATION DURING IDLE PERIOD IN WIRELESS LAN SYSTEM, AND TERMINAL DURING IDLE PERIOD OF WIRELESS LAN SYSTEM TERMINAL
    Publication number: 20150146598
    Abstract: Provided is technology for reducing power consumption of a terminal using hibernation of an access point (AP) managing a network in a wireless local area network (WLAN) environment, and an apparatus for performing hibernation during a rest time during which effective data traffic does not occur in a WLAN system according to an example embodiment, the apparatus may transmit a hibernation message indicating not to respond to a request of terminals during a predetermined period, determine a scheme of performing hibernation and whether to maintain an association between terminals associated before the hibernation is performed, and receive, after the predetermined period of the hibernation, effective data from the terminals.
    Type: Application
    Filed: June 19, 2013
    Publication date: May 28, 2015
    Inventors: Min Ho Cheong, Hyoung Jin Kwon, Jae Seung Lee, Jae Woo Park, Sok Kyu Lee
  • Apparatus and method for receiving data in communication system
    Patent number: 9042473
    Abstract: Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: May 26, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jong-Ee Oh, Hee-Jung Yu, Yu-Ro Lee, In-Kyeong Choi, Sok-Kyu Lee
  • APPARATUS FOR TRANSMITTING AND RECEIVING DATA TO PROVIDE HIGH-SPEED DATA COMMUNICATION AND METHOD THEREOF
    Publication number: 20150139215
    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: Application
    Filed: January 30, 2015
    Publication date: May 21, 2015
    Inventors: Hee-Jung YU, Taehyun JEON, Myung-Soon KIM, Eun-Young CHOI, Sok-kyu LEE, Deuk-Su LYU
  • Apparatus and method for transmitting/receiving data in communication system
    Patent number: 9036598
    Abstract: A data transmission apparatus in a communication system includes a reception unit configured to receive terminal information from a plurality of terminals through a new frequency band for transmission and reception of data between the plurality of terminals and an AP (access point); a determination unit configured to determine access timing of the terminals to the AP by using the terminal information, and generate terminal access information including information on the access timing; and a transmission unit configured to transmit the terminal access information and beacon frames to the terminals, wherein the terminals access the AP and transmit data frames to the AP, at the access timing based on the beacon frames.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: May 19, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hee-Jung Yu, Min-Ho Cheong, Sok-Kyu Lee
  • METHOD AND TERMINAL FOR REQUESTING AND ACQUIRING INFORMATION RELATING TO CHANNEL ACCESS IN WIRELESS LAN, AND APPARATUS FOR PROVIDING INFORMATION RELATING TO CHANNEL ACCESS IN WIRELESS LAN
    Publication number: 20150131570
    Abstract: Provided are a terminal for requesting and acquiring information associated with a channel access in a wireless local area network (WLAN) and an apparatus for providing information associated with a channel access in a WLAN, and more particularly, the terminal for requesting and acquiring information associated with a channel access in a WLAN according to an example embodiment may verify whether a beacon is received during a predetermined beacon interval, transmit a group and slot information request signal when the beacon is verified not to be received, and receive a group and slot information response signal in response to the group and slot information request signal.
    Type: Application
    Filed: June 13, 2013
    Publication date: May 14, 2015
    Inventors: Hyoung Jin Kwon, Jae Seung Lee, Min Ho Cheong, Hee Jung Yu, Sok Kyu Lee
  • DATA TRANSMISSION METHOD AND APPARATUS IN NETWORK LINKED WITH HETEROGENEOUS SYSTEM
    Publication number: 20150124776
    Abstract: Provided is a data transmission method and apparatus for maximizing data transmission efficiency by transmitting data through a flexible network transition in a network linked with a heterogeneous system.
    Type: Application
    Filed: November 3, 2014
    Publication date: May 7, 2015
    Inventors: Hee Soo LEE, Yu Ro LEE, Chang Wahn YU, Jong Ee OH, Jae Woo PARK, Sok Kyu LEE
  • MULTI-MODE WIRELESS TRANSMISSION METHOD AND APPARATUS
    Publication number: 20150117428
    Abstract: Provided is a next-generation wireless local area network (WLAN) frame communication method. The communication method may include modulating a first symbol in a signal field A (SIG-A) of a next-generation WLAN frame using a first modulation method, modulating a second symbol in the SIG-A of the next-generation WLAN frame using a second modulation method, and modulating a short training field (STF) signal of the next-generation WLAN frame in response to a next-generation WLAN mode.
    Type: Application
    Filed: October 27, 2014
    Publication date: April 30, 2015
    Inventors: Il Gu LEE, Hee Soo LEE, Sok Kyu LEE
  • DATA TRANSMISSION METHOD AND APPARATUS
    Publication number: 20150117427
    Abstract: Provided is a data transmission apparatus including a queue management unit to manage at least one queue in which information associated with at least one buffer descriptor (BD) is stored, a scheduler to estimate information to be transmitted among information associated with at least one media access control (MAC) protocol data unit (MPDU) using at least one transmission bitmap (Tx bitmap), a data transmitter to read the estimated information from information associated with a BD indicated in the at least one Tx bitmap, and transmit the read information to a physical layer, and a physical layer management unit to generate information associated with a presentation protocol data unit (PPDU) based on the transmitted information, and transmit the generated information over the air, wherein the at least one BD includes information associated with the at least one MPDU.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 30, 2015
    Inventors: Jae Woo PARK, Jee Yon CHOI, Sok Kyu LEE
  • METHOD FOR TRANSMITTING CONTROL AND TRAINING SYMBOLS IN MULTI-USER WIRELESS COMMUNICATION SYSTEM
    Publication number: 20150117429
    Abstract: The present invention relates to a method and an apparatus for transmitting control and training symbols to improve transmission efficiency in a multi-user wireless communication system. The method for transmitting the control and training symbols in the multi-user wireless communication system according to one embodiment of the present invention comprises the steps of: determining whether a required transmission rate of each data can be satisfied through channel estimation in each of terminals when different data are simultaneously transmitted to each of the terminals; and transmitting a data frame to each of the terminals, the data frame being composed to discriminate the control and training symbols in each of the terminals using a combination of time, frequency, and code area when the required transmission rate of each data is not satisfied according to the determined result.
    Type: Application
    Filed: November 26, 2014
    Publication date: April 30, 2015
    Inventors: Yu-Ro LEE, Jung-Bo SON, Sok-Kyu LEE
  • Method and apparatus for transceiving data in a MIMO system
    Patent number: 9014212
    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: Grant
    Filed: March 1, 2013
    Date of Patent: April 21, 2015
    Assignee: Electronics and Telecommunications Research Institute
    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
  • PHYSICAL LAYER LOW POWER COMMUNICATION METHOD AND APPARATUS
    Publication number: 20150103714
    Abstract: A physical layer low power communication method and apparatus are provided. The physical layer low power communication method may include receiving a data packet from a transmitter, measuring a channel quality using a preamble and signal field information included in the data packet and determining whether recovery of the data packet is possible, calculating an error generation rate according to a determination result, and discarding the data packet and operating in a power save mode when the error generation rate is higher than a predetermined reference.
    Type: Application
    Filed: September 16, 2014
    Publication date: April 16, 2015
    Inventors: Il Gu LEE, Jeong Chul SHIN, Hee Soo LEE, Sok Kyu LEE
  • Apparatus and method for signal constitution for downlink of OFDMA-based cellular system
    Patent number: RE45498
    Abstract: Disclosed are an adaptive pilot symbol assignment method that flexibly controls the number of transmit antennas according to each user's moving speed, channel status, or user request, and assigns proper pilot symbols in the downlink of an OFDMA (Orthogonal Frequency Division Multiplexing Access) based cellular system; and a sub-carrier allocation method for high-speed mobile that allocates some sub-carriers to assign proper pilot symbols for ultrahigh-speed mobile users, and the rest of the sub-carriers to the other users to assign proper pilot symbols to the users, on the assumption that the ultrahigh-speed mobile users have a traffic volume almost insignificant to the whole traffic volume.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: April 28, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sok-Kyu Lee, Kwang-soon Kim, Kyung-Hi Chang