Patents by Inventor Sung-Cheol Chang

Sung-Cheol Chang 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: 20220174745
    Abstract: An operation method of a base station in a communication system may comprise: generating first RACH configuration information for a normal terminal; generating second RACH configuration information for a RedCap terminal; transmitting a message including the first RACH configuration information and the second RACH configuration information; and performing a random access procedure with a first terminal based on the message, wherein a terminal type of the first terminal is identified based on the first RACH configuration information and the second RACH configuration information, and the terminal type is the normal terminal or the RedCap terminal.
    Type: Application
    Filed: November 30, 2021
    Publication date: June 2, 2022
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jung Hoon LEE, Jae Heung KIM, Sung Cheol CHANG
  • Publication number: 20220150940
    Abstract: A method for operating a transmission node performing link adaptation in a mobile communication network may include the steps of: receiving, from a resource allocation node, resource allocation information for a resource for transmission of data; determining link adaptation information and transmitting the determined link adaptation information to a reception node; and on the basis of the determined link adaptation information, transmitting the data to the reception node. Therefore, link adaptation accurately reflecting a radio channel state between a base station and terminals can be performed, thereby enabling efficient use of a radio resource.
    Type: Application
    Filed: May 6, 2020
    Publication date: May 12, 2022
    Inventor: Sung Cheol CHANG
  • Publication number: 20220150971
    Abstract: Provided is a method for transmitting, by a transmitter, a first data having periodicity through a channel of an unlicensed band: The transmitter adjusts at least one of transmission timing of the first data and clear channel assessment (CCA) timing for the channel to occupy the channel. The transmitter determines whether the channel may be occupied by performing a CCA on the channel at the CCA timing. The transmitter transmits the first data through the channel at the transmission timing of the first data, when it is determined that the channel may be occupied.
    Type: Application
    Filed: January 27, 2022
    Publication date: May 12, 2022
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung KIM, Jae Sun CHA, Chanho YOON, Seung-Kwon BAEK, Jae Joon PARK, Kwang Jae LIM, Sung Cheol CHANG
  • Patent number: 11272541
    Abstract: Provided is a method for transmitting, by a transmitter, a first data having periodicity through a channel of an unlicensed band: The transmitter adjusts at least one of transmission timing of the first data and clear channel assessment (CCA) timing for the channel to occupy the channel. The transmitter determines whether the channel may be occupied by performing a CCA on the channel at the CCA timing. The transmitter transmits the first data through the channel at the transmission timing of the first data, when it is determined that the channel may be occupied.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: March 8, 2022
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Jae Sun Cha, Chanho Yoon, Seung-Kwon Baek, Jae Joon Park, Kwang Jae Lim, Sung Cheol Chang
  • Publication number: 20220046527
    Abstract: A relaying method, performed by a relay terminal using sidelink in a communication system, may comprise: receiving a plurality of data units from a plurality of remote terminals; generating a multiplexed data unit including identification information of the plurality of remote terminals and the plurality of data units; and transmitting the multiplexed data unit to a base station, wherein the identification information includes a terminal identifier used to identify each of the plurality of remote terminals.
    Type: Application
    Filed: August 4, 2021
    Publication date: February 10, 2022
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Sung Cheol CHANG
  • Patent number: 11206592
    Abstract: An operation method of a terminal performing handover in a mobile communication system may comprise transmitting packet data convergence protocol (PDCP) downlink reception status information of the terminal and information on a target base station to a source base station; receiving downlink data from a user plane function (UPF) via the source base station based on a first tunnel configured between the source base station and the UPF; receiving downlink data from the UPF via the target base station based on a second tunnel configured by the UPF between the target base station and the UPF by using the PDCP downlink reception status information and the information on the target base station, which are transferred from the source base station; and discarding duplicated-received protocol data units (PDUs) from the source base station and the target base station, and reordering remaining PDUs.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: December 21, 2021
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyun Seo Park, Yun Joo Kim, Eunkyung Kim, Tae Joong Kim, An Seok Lee, Yu Ro Lee, Sung Cheol Chang
  • Publication number: 20210392679
    Abstract: An operation method of a terminal in a communication system may comprise receiving first random access (RA) configuration information and second RA configuration information from a base station; transmitting a Msg1 to the base station based on the second RA configuration information; receiving a Msg2, which is a response to the Msg1, from the base station; and repeatedly transmitting a Msg3 K times to the base station.
    Type: Application
    Filed: June 15, 2021
    Publication date: December 16, 2021
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Cheul Soon KIM, Jae Heung KIM, Sung Hyun MOON, Jung Hoon LEE, Sung Cheol CHANG
  • Publication number: 20210329580
    Abstract: An operation method of a first terminal, for synchronized operations according to time-sensitive networking, may comprise: receiving information on a reference time from a base station; obtaining an offset of the first terminal with respect to the reference time or information for deriving the offset, and deriving the offset from the information for deriving the offset; determining a timing at which uplink transmission is performed by reflecting the offset to the reference time; and performing the uplink transmission at the determined timing.
    Type: Application
    Filed: April 16, 2021
    Publication date: October 21, 2021
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Cheul Soon KIM, Jae Heung KIM, Sung Hyun MOON, Jung Hoon LEE, Sung Cheol CHANG
  • Patent number: 11129173
    Abstract: A device-to-device (D2D) communication method, performed by a receiving D2D terminal, may comprise receiving D2D data from a transmitting D2D terminal; generating feedback information for the D2D data; and receiving information on a first resource for transmission of the feedback information from a base station, and transmitting the feedback information to the transmitting D2D terminal through the first resource, wherein the information on the first resource is received without an explicit scheduling request (SR) to the base station.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: September 21, 2021
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Yun Joo Kim, Yu Ro Lee, EunKyung Kim, Tae Joong Kim, Hyun Seo Park, An Seok Lee, Sung Cheol Chang
  • Publication number: 20210007036
    Abstract: An operation method of a terminal in a communication system, according to the present disclosure, may comprise performing measurement on a source base station and neighbor base stations, and identifying a state of a radio link established between the terminal and the source base station; predicting a probability of a handover failure based on the state of the radio link and a measurement result according to the measurement; when it is predicted that the handover is to fail, identifying whether a handover command message is received from the source base station; and when the handover command message is not received, performing cell selection for radio connection re-establishment.
    Type: Application
    Filed: June 30, 2020
    Publication date: January 7, 2021
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyun Seo PARK, Yun Joo KIM, Eunkyung KIM, Tae Joong KIM, An Seok LEE, Yu Ro LEE, Sung Cheol CHANG
  • Publication number: 20200336960
    Abstract: An operation method of a terminal performing handover in a mobile communication system may comprise transmitting packet data convergence protocol (PDCP) downlink reception status information of the terminal and information on a target base station to a source base station; receiving downlink data from a user plane function (UPF) via the source base station based on a first tunnel configured between the source base station and the UPF; receiving downlink data from the UPF via the target base station based on a second tunnel configured by the UPF between the target base station and the UPF by using the PDCP downlink reception status information and the information on the target base station, which are transferred from the source base station; and discarding duplicated-received protocol data units (PDUs) from the source base station and the target base station, and reordering remaining PDUs.
    Type: Application
    Filed: April 14, 2020
    Publication date: October 22, 2020
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyun Seo PARK, Yun Joo KIM, Eunkyung KIM, Tae Joong KIM, An Seok LEE, Yu Ro LEE, Sung Cheol CHANG
  • Publication number: 20200170023
    Abstract: A device-to-device (D2D) communication method, performed by a receiving D2D terminal, may comprise receiving D2D data from a transmitting D2D terminal; generating feedback information for the D2D data; and receiving information on a first resource for transmission of the feedback information from a base station, and transmitting the feedback information to the transmitting D2D terminal through the first resource, wherein the information on the first resource is received without an explicit scheduling request (SR) to the base station.
    Type: Application
    Filed: August 30, 2019
    Publication date: May 28, 2020
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Yun Joo KIM, Yu Ro LEE, EunKyung KIM, Tae Joong KIM, Hyun Seo PARK, An Seok LEE, Sung Cheol CHANG
  • Patent number: 10637701
    Abstract: A method and an apparatus for transmitting the physical uplink control channel including an uplink control channel expressed by product of a uplink control information and a sequence and demodulation reference signal expressed by a sequence having different cyclic shift values through a short resource block are provided.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: April 28, 2020
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Taegyun Noh, Kwang Jae Lim, Chul Sik Yoon, Yu Ro Lee, Sung Cheol Chang
  • Patent number: 10575334
    Abstract: A terminal of a communication system transmits a first signal through a physical uplink channel that is allocated within a first radio resource based on a first Transmission Time Interval (TTI) having a first time length at a first step for uplink access, performs the remaining steps for the uplink access using a second radio resource based on the second TTI from a base station, when the terminal may operate based on a second TTI having a second time length smaller than the first time length, and transmits uplink data.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: February 25, 2020
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seungkwon Cho, Soojung Jung, Taegyun Noh, Anseok Lee, Sung Cheol Chang
  • Publication number: 20190394804
    Abstract: Provided is a method for transmitting, by a transmitter, a first data having periodicity through a channel of an unlicensed band: The transmitter adjusts at least one of transmission timing of the first data and clear channel assessment (CCA) timing for the channel to occupy the channel. The transmitter determines whether the channel may be occupied by performing a CCA on the channel at the CCA timing. The transmitter transmits the first data through the channel at the transmission timing of the first data, when it is determined that the channel may be occupied.
    Type: Application
    Filed: August 9, 2019
    Publication date: December 26, 2019
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung KIM, Jae Sun CHA, Chanho YOON, Seung-Kwon BAEK, Jae Joon PARK, Kwang Jae LIM, Sung Cheol CHANG
  • Patent number: 10440744
    Abstract: Disclosed are a base station and a channel access method performing a channel access in a unlicensed band. The channel access method includes: performing channel sensing at least once on a channel of the unlicensed band in a channel sensing period of a frame; and broadcasting a reservation signal for the channel when the channel is empty.
    Type: Grant
    Filed: March 26, 2017
    Date of Patent: October 8, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jae Sun Cha, Eunkyung Kim, Jae Joon Park, Seung-Kwon Baek, Pyeong Jung Song, Chanho Yoon, Sung Cheol Chang
  • Patent number: 10425830
    Abstract: Disclosed is a mobile communication network system and a network configuring method. The communication network system includes: a common control access network; at least one access network slice added according to a service type requested by a device; a common control core network; and at least one core network slice added according to a service type requested by the device. The access network slice and the core network slice are determined by the service type requested by the device.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: September 24, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Pyeong Jung Song, Hyun Lee, Sung Cheol Chang
  • Patent number: 10419173
    Abstract: Disclosed herein are a method and an apparatus for transmitting an uplink signal. The method for transmitting an uplink signal includes: transmitting an uplink data in at least one symbol included in a short transmit time interval (sTTI) including 7 symbols or less; and transmitting a demodulation reference signal (DMRS) for the uplink data through an even-numbered subcarrier or an odd-numbered subcarrier in one symbol in which the uplink data is not transmitted, among the symbols included in the sTTI.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: September 17, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Yu Ro Lee, Kwang Jae Lim, Sung Cheol Chang
  • Patent number: 10404441
    Abstract: Disclosed herein is a base station of a mobile communication system configuring at least one low latency transmission time interval (TTI) within a length of at least one transmission symbol in a subframe including a plurality of transmission symbols and transmitting LL (low latency) TTI related information using a physical control format indicator channel (PCFICH) transmitted at a pre-defined transmission symbol position within the subframe.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: September 3, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Soojung Jung, Anseok Lee, Seungkwon Cho, Sung Cheol Chang
  • Patent number: 10333738
    Abstract: A base station defines a short TTI (transmission time interval) equal to the length of one subslot as the minimum unit of a time resource for data transmission in a subframe including a plurality of subslots, determines the RS type the terminal will use for transmission, among a plurality of RS types, based on the positions of RSs (reference signals) within the short TTI, and sends information on the RS type the terminal will use for transmission to the terminal.
    Type: Grant
    Filed: June 4, 2016
    Date of Patent: June 25, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Yu Ro Lee, Kwang Jae Lim, Won-Ik Kim, Taegyun Noh, Sung Cheol Chang