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 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
  • 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
  • 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
  • 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 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
  • Communication method of relay, terminal, and communication method of the terminal
    Patent number: 9173237
    Abstract: A relay, a terminal, and a communication method of the same are provided. The terminal acting as a relay receives a message including scan duration information from a superordinate HR-BS, and the terminal transmits a message including the scan duration information to a subordinate HR-MS. The terminal receives an A-preamble from the superordinate HR-BS according to the scan duration information.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: October 27, 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, Mi Young Yun, Seokki Kim, Hyun Lee, Chul Sik Yoon, Kwang Jae Lim, Seokjoo Shin
  • Multicast management method and apparatus
    Patent number: 9154922
    Abstract: A multicast management method of a base station is provided. The base station generates a CRC for a message including resource allocation information of a multicast group including a plurality of terminals, and masks the CRC by a CRC mask. The base station adds the masked CRC to the message, and then transmits the message to which the masked CRC is added to the multicast group.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: October 6, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Sung Cheol Chang, Sung Kyung Kim, Hyun Lee, Chul Sik Yoon
  • Base station, mobile station, paging message transmitting method, and paging message receiving method
    Patent number: 9137777
    Abstract: A base station transmits a first message including indices of a plurality of carriers and information for the plurality of carrier to a mobile station. Also, the base station transmits a second message including a bitmap representing whether each of the plurality of carriers corresponds to a paging carrier used for transmitting a paging message, to the mobile station. The base station selects a paging transmission carrier for the mobile station from among the plurality of carriers and transmits a paging message through the selected paging transmission carrier.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: September 15, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Soojung Jung, Eunkyung Kim, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Method and apparatus for transmitting frames in talk-around direct communication
    Patent number: 9113482
    Abstract: A permutated channel structure based on a block structure in talk-around direct communication is provided. A dedicated subchannel interferes with only one adjacent dedicated subchannel, even with a large synchronization error, by permutating the dedicated subchannels by cyclic shifts, whereby diversity gain can be maintained and interference between adjacent channels can be minimized.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: August 18, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seokki Kim, Sung Cheol Chang, Mi Young Yun, Won-Ik Kim, Hyun Lee, Sung Kyung Kim, Chul Sik Yoon
  • OPPORTUNISTIC DOWNLINK INTERFERENCE ALIGNMENT
    Publication number: 20150181611
    Abstract: A communication system configured to send data using an interference alignment scheme is disclosed herein. The disclosed communication system includes an MS and a BS. The disclosed BS sends data using a transmission beamforming matrix that minimizes intra-cell interference. The disclosed MS receives the data using a reception beamforming matrix that minimizes inter-cell interference. The BS sends information about a reference beamforming matrix to the MS, and sends a pilot signal to the MS using the reference beamforming matrix. The MS estimates an effective channel using the reference beamforming matrix, and calculates the intensity of an interference signal from an interference BS.
    Type: Application
    Filed: December 23, 2014
    Publication date: June 25, 2015
    Applicants: Industry-Academic Cooperation Foundation Gyeongsang National University, Electronics and Telecommunications Research Institute
    Inventors: Bang Chul JUNG, Won Yong SHIN, Hyun Jong YANG, Jae Joon PARK, Kwang Jae LIM, Jae Sun CHA, Eun Kyung KIM, Hyun LEE, Sung Cheol CHANG
  • Mobile station, base station, and relay station for a wireless access system
    Patent number: 9066254
    Abstract: Protocol structure of a mobile station, base station or relay station in a wireless access system is provided. The protocol structure includes a first function block configured to perform radio resource control and management as a MAC layer and to reside on a control plane, and a second function block configured to perform medium access control as the MAC layer and to reside on the control plane and a data plane. The first function block includes various function blocks for supporting high reliability.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: June 23, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Sung Cheol Chang, Sung Kyung Kim, Hyun Lee, Chul Sik Yoon
  • Identifying method and protocol data unit generating apparatus
    Patent number: 9042242
    Abstract: A terminal identifying method identifies a terminal in a media access control layer, and includes allocating a station ID to the terminal for identifying the terminal, and allocating a flow ID to a connection in the terminal for identifying the connection in the terminal.
    Type: Grant
    Filed: July 3, 2009
    Date of Patent: May 26, 2015
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Sung-Geun Jin, Won-Ik Kim, Kwang Jae Lim, Chul Sik Yoon
  • Mobile relay station and handover method thereof
    Patent number: 9042346
    Abstract: A mobile relay station (RS) and a handover method thereof are provided. When it is determined that a mobile RS performs handover from a superordinate base station (BS) to a target BS, information indicating admission of handover is received from the superordinate BS. The mobile RS transmits a service unavailability section to a subordinate terminal, whereby the subordinate terminal is prevented from performing handover to a different BS or a different RS.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: May 26, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Won-Ik Kim, Sung Kyung Kim, Seokki Kim, Mi Young Yun, Hyun Lee, Chul Sik Yoon, Sung Cheol Chang
  • Method and terminal for direct communication between terminals
    Patent number: 9036550
    Abstract: A direct communication method between terminals is provided. When a terminal receives a plurality of synchronization information parts, the terminal selects synchronization information to acquire a reference time among the plurality of synchronization information parts according to a priority. Here, the priority is an order of first synchronization information that is received from a base station, second synchronization information that is received from a global positioning system (GPS), and third synchronization information that is received from a terminal in which a hop count from the base station or the GPS is small.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: May 19, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Cheol Chang, Mi Young Yun, Seokki Kim, Won-Ik Kim, Sung Kyung Kim, Eunkyung Kim, Chul Sik Yoon, Kwang Jae Lim