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).

  • METHOD AND APPARATUS FOR CONFIGURING TRANSMISSION TIME INTERVAL IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20160135182
    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: Application
    Filed: November 11, 2015
    Publication date: May 12, 2016
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Soojung JUNG, Anseok LEE, Seungkwon CHO, Sung Cheol CHANG
  • METHOD AND APPARATUS FOR TRANSMITTING IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20160128039
    Abstract: A transmitting apparatus in a mobile communication system determines a size of a Transmission Time Interval (TTI) that allocates a transmitting symbol in a minimum unit according to a quantity of data to transmit to each receiving apparatus and a latency time, allocates a control channel and a data channel in a frequency domain of a subframe including a plurality of transmitting symbols, and transmits respective control information and data to corresponding receiving apparatuses through the control channel and the data channel at the determined TTI in a radio frame including a plurality of subframes.
    Type: Application
    Filed: April 1, 2015
    Publication date: May 5, 2016
    Applicant: ETRI - Electronics and Telecommunications Research Institute
    Inventors: Kwang Jae LIM, Sung Cheol CHANG
  • Method for communication of base station, terminal and relay station
    Patent number: 9332482
    Abstract: A method for communication of a base station includes: receiving first data from a first terminal; transmitting the first data to a second terminal by local forwarding without passing through an access service network (ASN); receiving second data from the second terminal; and transmitting the second data to the first terminal without passing through the ASN.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: May 3, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Sung Kyung Kim, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon, Kwang Jae Lim
  • Method of relay between devices
    Patent number: 9319127
    Abstract: A data relay method includes receiving a relay request from a BS, and when the relay request is accepted, relaying data between the BS and at least one external terminal, or the data relay method includes determining relaying between a first terminal among a plurality of terminals, and other remaining terminals excluding the first terminal among the plurality of terminals, and relaying data between the first terminal and the other remaining terminals.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: April 19, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Jae Sun Cha, Jae Joon Park, Hyun Lee, Kwang Jae Lim, Sung Cheol Chang
  • METHOD AND APPARATUS FOR MANAGING ALLOCATION AND USAGE OF RADIO RESOURCE, METHOD AND APPARATUS FOR TRANSMITTING DATA THROUGH UNLICENSED BAND CHANNEL, AND METHOD AND APPARATUS FOR MANAGING ACCESS OF RADIO RESOURCE
    Publication number: 20160095114
    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: September 25, 2015
    Publication date: March 31, 2016
    Inventors: Eunkyung KIM, Jae Sun CHA, Chanho YOON, Seung-Kwon BAEK, Jae Joon PARK, Kwang Jae LIM, Sung Cheol CHANG
  • Synchronization method and apparatus in device-to-device direct communication
    Patent number: 9277518
    Abstract: A synchronization method by a device is provided in a device-to-device direct communication. The device receives synchronization signals from a plurality of other devices at a current frame, and estimates a synchronization time at a next frame based on the synchronization signals received from the other devices.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: March 1, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyung Jin Kim, Chanho Yoon, Soojung Jung, Sung Kyung Kim, Seungkwon Cho, Sung Cheol Chang, DongSeung Kwon
  • Apparatus and method for transmitting synchronization signal
    Patent number: 9276693
    Abstract: A synchronization signal transmitting apparatus generates a plurality of different primary synchronization signals that are transmitted in an ultra frame unit within one super ultra frame and generates one secondary synchronization signal that is transmitted in a frame unit within one super ultra frame.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: March 1, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyung Jin Kim, Seokki Kim, Soojung Jung, Seungkwon Cho, Sung Cheol Chang, DongSeung Kwon
  • Method and apparatus for managing multicast and broadcast service resource
    Patent number: 9271262
    Abstract: When zone allocation information of sub-bands is changed, a terminal receives a new MBS configuration message after a lifetime of an MBS configuration message at a time when the changed zone allocation information is received is expired. The terminal applies the changed zone allocation information at the beginning of the first MSI of the new MBS configuration message.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: February 23, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Sung Cheol Chang, Jae Sun Cha, Soojung Jung, Hyun Lee, Chul Sik Yoon
  • Method and apparatus for detecting collision in wireless multi-access channel
    Patent number: 9264175
    Abstract: A method and an apparatus for detecting a collision in a wireless multi-access channel are disclosed. The method of detecting the collision in the wireless multi-access according to an exemplary embodiment includes generating a request-to-send (RTS) message by a transmission terminal, transmitting the RTS message to a reception terminal, and receiving a response message from the reception terminal and determining whether a collision occurs based on a number of pieces of tone information included in the response message.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: February 16, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung Geun Jin, Byung Jae Kwak, Jin Kyeong Kim, Sung Cheol Chang, Seung Chan Bang
  • Signalling method for direct communication between terminals
    Patent number: 9265071
    Abstract: A signaling method for a terminal that performs direct communication between terminals terminal is disclosed. A transmitting terminal transmits a link establishment request message for establishing a link to a receiving terminal, and the receiving terminal transmits a link establishment response message responding to this message to the transmitting terminal. The link establishment request message includes a field indicating a flow to use if the receiving terminal acquires a token.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: February 16, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Cheol Chang, Mi Young Yun, Seokki Kim, Won-Ik Kim, Hyun Lee, Sung Kyung Kim, Chul Sik Yoon
  • Method and apparatus for managing configuration information of multicast and broadcast service
    Patent number: 9226116
    Abstract: For managing MBS configuration information, a terminal decodes an MBS configuration message including configuration information for an MBS operation and a lifetime, and then decodes an MBS configuration message that is transmitted at a time that the lifetime indicates.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: December 29, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Jae Sun Cha, Soojung Jung, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Terminal and communication method thereof
    Patent number: 9209886
    Abstract: A communication method of a terminal that can operate in a relay mode or a base station mode is provided. When the terminal, having received a service from a first base station, detects that a service connection to the first base station is unavailable, the terminal searches for a second base station, which is an available neighboring base station. The terminal transmits a ranging request message including a base station identifier of the first base station to the second base station.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: December 8, 2015
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, INDUSTRY-ACADEMIC COOPERATION FOUNDATION, CHOSUN UNIVERSITY
    Inventors: Won-Ik Kim, Eunkyung Kim, Sung Kyung Kim, Sung Cheol Chang, Jae Sun Cha, Mi Young Yun, Seokki Kim, Hyun Lee, Chul Sik Yoon, Kwang Jae Lim, Seokjoo Shin
  • Method and apparatus for transmitting synchronization channel, and method and apparatus for receiving synchronization channel
    Patent number: 9209918
    Abstract: In a direct communication between terminals, a terminal transmits a synchronization channel preamble part after transmitting a synchronization channel message part including synchronization information. The terminal receives a dedicated channel including a direct communication packet after transmitting the synchronization channel preamble part. A transition time gap for switching from transmission to reception may be inserted to an end of the synchronization channel preamble part.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: December 8, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seokki Kim, Sung Cheol Chang, Mi Young Yun, Eunkyung Kim, Won-Ik Kim, Hyun Lee, Sung Kyung Kim, Chul Sik Yoon, Kwang Jae Lim
  • Method of transmitting and receiving data in talk-around direct communication network
    Patent number: 9204479
    Abstract: A method in which a transmitting terminal included in an talk-around direct communication (TDC) network transmits data includes: determining a data frame for transmitting the data; requesting to reserve a data transmission segment included in the data frame through a transmission request segment included in the data frame; receiving a response signal transmitted in a transmission response segment included in the data frame; and analyzing the response signal and transmitting the data through the data transmission segment.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: December 1, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Kyung Kim, Soojung Jung, Seungkwon Cho, Hyung Jin Kim, Chanho Yoon, Sung Cheol Chang
  • Method of direct communication between terminals respectively connected and unconnected to base station
    Patent number: 9198201
    Abstract: Referring to FIG. 4, if the direct communication terminal 120, among the direct communication terminals 120 and 130 receiving a downlink multicast service from the base station 200 through the forwarding terminal 110, wants to be a talker, the direct communication terminal 120 performs a unicast connection establishment procedure with the forwarding terminal 110, in order to transmit an uplink unicast packet.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: November 24, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Mi Young Yun, Chul Sik Yoon, Hyun Lee, Seokki Kim, Won-Ik Kim, Sung Kyung Kim, Sung Cheol Chang
  • Group communication method and apparatus
    Patent number: 9191785
    Abstract: A group communication method of a terminal is provided. The terminal establishes a group call connection with a first base station belonging to a group call zone, and receives group call data from the first base station. When moving to the coverage area of a second base station belonging to the group call zone, the terminal receives group call data from the second base station.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: November 17, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Kyung Kim, Sung Cheol Chang, Eunkyung Kim, Hyun Lee, Chul Sik Yoon
  • Method and apparatus for managing resource
    Patent number: 9191941
    Abstract: A method of managing a resource is provided by a base station. The base station allocates a resource to a terminal, and generates a downlink control channel including information of the allocated resource and a transmission time of a next downlink control channel. Further, the base station transmits the downlink control channel to the terminal.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: November 17, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Kyung Kim, Sung Cheol Chang, Chul Sik Yoon, Mi Young Yun, Won-Ik Kim, Hyun Lee, Seokki Kim
  • METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SYSTEM INFORMATION IN MOBILE COMMUNICATION SYSTEM
    Publication number: 20150326371
    Abstract: A method and apparatus of receiving system information of an SeNB, including configuring connection to an MeNB and receiving a RRC Connection Reconfiguration message including the system information of a cell included in a SCG controlled by the SeNB, and a method of sharing frame offset between a MCG controlled by an MeNB and an SCG controlled by an SeNB connected to the MeNB through non-ideal backhaul, including measuring system frame number (SFN) and subframe number (SN) of a cell included in the SCG and sharing the frame offset, which is determined based on the SFN and the SN, with the MeNB or the SeNB are provided.
    Type: Application
    Filed: May 8, 2015
    Publication date: November 12, 2015
    Inventors: Seung-Kwon BAEK, Eunkyung KIM, Kwang Jae LIM, Jae Sun CHA, Sung Cheol CHANG
  • Method of low-duty mode operation of femtocell base station
    Patent number: 9185679
    Abstract: A method of setting a cycle of a low-duty mode in a femto base station is provided. The cycle of the low-duty mode has a pattern in which an available interval and an unavailable interval repeatedly appear, and the available interval is set to include a paging listening interval of a paging cycle. A method of setting a cycle of a low-duty mode in a femto base station having a service area overlapping with that of a macrocell is provided. An unavailable interval is set by taking the overlapping degree of the service area of the femto base station with the macrocell into consideration. A method of setting a cycle of a low-duty mode in a plurality of femto base stations operated in the low-duty mode is provided. The same cycle can be set for a plurality of base stations.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: November 10, 2015
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Won-Ik Kim, Hyun-Jae Kim, Sung Kyung Kim, Chul Sik Yoon
  • Method and apparatus for transmitting synchronization signal in talk-around direct communication network
    Patent number: 9179269
    Abstract: A method and apparatus for transmitting a synchronization signal in a talk-around direct communication network is provided. The method includes: determining one of a plurality of second windows included in a first window as a synchronization reception window; selecting one of a plurality of synchronization slots included in the second windows as a first synchronization slot; transmitting a first synchronization signal through the first synchronization slot included in the second windows, excluding the synchronization reception window; detecting a second synchronization signal transmitted from other terminals using the first synchronization slot included in the synchronization reception window; and determining that a collision from amongst the synchronization signals has occurred based on the detection result.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: November 3, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyun Lee, Mi Young Yun, Seok Ki Kim, Won-Ik Kim, Chul Sik Yoon, Sung Cheol Chang