Patents by Inventor Hyoseok Yi

Hyoseok Yi 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: 20100208709
    Abstract: Provided is a method of efficiently transmitting an acknowledgement/negative acknowledgement (ACK/NACK) bit supporting hybrid automatic repeat request (HARQ) in a wireless communication system supporting multi-user multi-input and multi-output (MIMO). The method transmits the same downlink code and in-phase/quadrature (I/Q) multiplexed ACK/NACK bit to two mobile stations using the same uplink resource block. Accordingly, the method can efficiently transmit the ACK/NACK bit for multi-user MIMO and efficiently use downlink radio resources.
    Type: Application
    Filed: June 13, 2008
    Publication date: August 19, 2010
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT
    Inventors: Il-Gyu Kim, Hyeong-Geun Park, Young-Jo Ko, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20100182976
    Abstract: When a plurality of terminals share the same resources in a wireless communication system, and when control information such as acknowledgement/negative acknowledgement (ACK/NAK) information or scheduling information is transmitted, a method of efficiently performing code division multiplexing (CDM) is required to distinguish the plurality of terminals. In particular, it is necessary to develop a method by which a code sequence of CDM can be selected and used according to each cell condition. Provided is a method of forming a signal in a wireless communication system in which a plurality of terminals commonly share frequency and time resources. The method includes the operations of receiving condition information in a cell; selecting one of a plurality of time domain orthogonal sequences having different lengths, according to the condition information; and allocating the selected time domain orthogonal sequence to a control signal symbol block.
    Type: Application
    Filed: June 23, 2008
    Publication date: July 22, 2010
    Applicants: Electronics and Telecommunications Research Institute, KT Corporation
    Inventors: Young-Jo Ko, Hyeong-Geun Park, Il-Gyu Kim, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20100172330
    Abstract: Provided is a method of forming a signal in a wireless communication system in which a plurality of terminals commonly use time and frequency resources for efficient code hopping. The method includes allocating the same frequency-axis sequence and different time-axis sequences to a plurality of terminals by using a resource index according to a first slot in the first slot; and allocating different frequency-axis sequences and different time-axis sequences to the plurality of terminals by using a resource index according to a second slot in the second slot.
    Type: Application
    Filed: June 16, 2008
    Publication date: July 8, 2010
    Inventors: Young-Jo Ko, Hyeong-Geun Park, Il-Gyu Kim, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20100080307
    Abstract: Provided is a method of forming a random access preamble structure for an extended cell radius in a cellular system, the method including: generating a cyclic prefix (CP), which is the sum of a maximum delay spread and the maximum round trip delay according to the extended cell; generating a preamble sequence part. The method is used to form a preamble structure for an extended cell radius from among random access preamble structures transmitted when initial synchronization is achieved, when synchronization is lost, or when a handover is performed, during a random access process of the cellular system.
    Type: Application
    Filed: January 4, 2008
    Publication date: April 1, 2010
    Inventors: Moon-Sik Lee, Hye-Kyung Jwa, Hyoseok Yi, Young-Hoon Kim
  • Publication number: 20100061322
    Abstract: A piece of user equipment (UE), which has received more than two synchronization codes at the same time, has a problem in that the UE may not confirm the synchronization codes due to an increase in inter-signal interference. As a result, the UE may not acquire a primary scrambling code (PSC). A method of transmitting a forward synchronization signal in a wireless communication system includes: each base station existing in a wireless communication system generating a frame according to a predetermined unit of frame timing by using a same external clock signal; and allocating different offsets to frames of adjacent base stations by using the external clock signal so that forward link common channels included in the frames do not overlap each other, and transmitting the frames.
    Type: Application
    Filed: November 23, 2007
    Publication date: March 11, 2010
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Il-Gyu Kim, Hyeong-Geun Park, Young-Jo Ko, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20090232125
    Abstract: In a cellular system in which OFDM is used, a forward link synchronization channel, a common pilot channel structure, an initial cell searching method of a mobile station, and an adjacent cell searching method for handover are required. A method of transmitting a forward synchronization signal in a wireless communication system according to the present invention includes generating a frame comprised of a plurality of sync blocks; and transmitting the frame through a forward link, wherein the frame comprises primary synchronization channel sequences which provide timing information of the sync blocks and a plurality of secondary synchronization channel sequences which provide timing information of the frame, wherein a cell identifier is specified by a combination of the primary synchronization channel sequence and a hopping code word specified by the plurality of the secondary synchronization channel sequences. Therefore, the cell searching time can be efficiently reduced in an OFDM system.
    Type: Application
    Filed: July 25, 2007
    Publication date: September 17, 2009
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Il-Gyu Kim, Hyeong-Geun Park, Young-Jo Ko, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20090196279
    Abstract: Provided are a sync channel of a forward link, a common pilot channel structure, and an initial cell search method and an adjacent cell search method for handover in a cellular system using orthogonal frequency division multiplexing (OFDM). A cell search method in an OFDM cellular system in which a primary sync channel and a secondary sync channel are configured based on time division multiplexing (TDM) includes acquiring sync block synchronization and a primary sync channel sequence number using a primary sync channel symbol included in a frame received by a terminal, detecting a boundary of the frame and a scrambling code group using the sync block and a secondary sync channel symbol included in the frame received by the terminal, and acquiring a scrambling code using the primary sync channel sequence number and the scrambling code group, thereby reducing cell search time with low complexity.
    Type: Application
    Filed: April 17, 2009
    Publication date: August 6, 2009
    Applicants: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Il-Gyu KIM, Hyeong-Geun PARK, Young-Jo KO, Kapseok CHANG, Hyoseok YI, Jun-Hwan LEE, Young-Hoon KIM, Seung-Chan BANG