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 TRANSMITTING AND RECEIVING DATA
    Publication number: 20130107789
    Abstract: A data transmission apparatus transmits a first control message including information needed for a data receiving apparatus to receive multicast broadcast service (MBS) data to the data receiving apparatus, and allocates a first carrier to the data receiving apparatus as a secondary carrier. The data transmission apparatus activates the first carrier without a procedure for exchanging a second control message for activating a carrier after the transmission of the first control message is achieved. The data transmission apparatus transmits MBS data to the data receiving apparatus through the first carrier.
    Type: Application
    Filed: June 28, 2011
    Publication date: May 2, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • METHOD AND TERMINAL FOR DIRECT COMMUNICATION BETWEEN TERMINALS
    Publication number: 20130077512
    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: Application
    Filed: September 14, 2012
    Publication date: March 28, 2013
    Inventors: Sung Cheol Chang, Mi-Young Yun, Seokki Kim, Won-Ik Kim, Sung Kyung Kim, Eunkyung Kim, Chul Sik Yoon, Kwang Jae Lim
  • METHOD AND APPARATUS FOR MANAGING MULTICAST SERVICE
    Publication number: 20130064164
    Abstract: A method of managing a multicast service is provided to a mobile station. The mobile station receives from a base station a message including information on a multicast indication cycle including a multicast available interval and a multicast unavailable interval. The mobile station receives a multicast indicator in the multicast available interval of the multicast indication cycle, and receives a multicast traffic at a transmission time indicated by the multicast indicator.
    Type: Application
    Filed: September 7, 2012
    Publication date: March 14, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung KIM, Sung Cheol CHANG, Sung Kyung KIM, Won-lk KIM, Mi Young YUN, Seokki KIM, Hyun LEE, Chul Sik YOON, Kwang Jae LIM
  • METHOD FOR COMMUNICATION OF TERMINAL AND METHOD FOR COMMUNICATION OF BASE STATION
    Publication number: 20130065634
    Abstract: A method for communication of a terminal and a method for communication of a base station are disclosed. Communication between a first base station with a problem in a backbone and a second base station located beyond the coverage of the degraded base station and neighboring the first base station is relayed by a terminal. Accordingly, the first base station is able to continuously provide service to subordinate stations.
    Type: Application
    Filed: September 10, 2012
    Publication date: March 14, 2013
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Anseok LEE, Eunkyung KIM, Sung Cheol CHANG, Sung Kyung KIM, Won-Ik KIM, Mi Young YUN, Hyun LEE, Kwang Jae LIM, DongSeung KWON
  • BASE STATION, MOBILE STATION, PAGING MESSAGE TRANSMITTING METHOD, AND PAGING MESSAGE RECEIVING METHOD
    Publication number: 20130039255
    Abstract: A method for a base station supporting multicarrier operation to transmit a paging message is provided. The base station determines a first time point for multicast broadcast service (MBS)-related information and transmits the MBS-related information through a first carrier at the first time point. Also, the base station determines a second time point for transmitting a paging message to a mobile station, determines a second carrier for transmitting the paging message to the mobile station, and transmits the paging message through the second carrier at the second time point. Here, the second time point is different from the first time point.
    Type: Application
    Filed: April 29, 2011
    Publication date: February 14, 2013
    Applicant: Electronics and Telecommunications Research Insti
    Inventors: Eunkyung Kim, Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Femtocell base station apparatus and self-configuring method thereof
    Patent number: 8374138
    Abstract: A self-configuring method of a femtocell base station extracts preambles from signals received from adjacent macrocells and femtocells. Transmission power of the femtocell base station is set using the extracted macrocell preambles. In addition, the preambles of the femtocell base station are selected using the correlation values between the macrocell preambles and the pre-stored femtocell preambles. Moreover, the resources for data transmission of the femtocell base station are allocated considering the adjacent macrocells and the femtocells.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: February 12, 2013
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Chul Sik Yoon, Jee Hwan Ahn, Young Jin Sang, Kwang Soon Kim
  • Resource allocation and power control method
    Patent number: 8369862
    Abstract: A method for controlling transmission power in a mobile communication system is provided. According to the method, a serving base station arranges a plurality of terminals in ascending order according to Carrier-to-Interference-and-Noise-Ratios (CINRs) based on the CINR measured by the plurality of terminals, classifies the plurality of terminals in one of a first group and a second group according to the order, allocates a subchannel of a data region corresponding to the first group from among a plurality of data regions included in the uplink frame to a terminal classified as the first group, and allocates a subchannel of a data region corresponding to the second group from among the data regions to a terminal classified as the second group.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: February 5, 2013
    Assignees: Samsung Electronics Co., Ltd., Electronics & Telecommunications Research Institute
    Inventors: Hyun-Jae Kim, Sung Cheol Chang, Won-Ik Kim, Sung Kyung Kim, Chul Sik Yoon, Jee Hwan Ahn
  • BASE STATION, MOBILE STATION, PAGING MESSAGE TRANSMITTING METHOD, AND PAGING MESSAGE RECEIVING METHOD
    Publication number: 20130029697
    Abstract: A base station allocates a paging group to a mobile station. The base station transmits, to a mobile station, a first message including indices of a plurality of carriers and information for the plurality of carriers and a second message including paging group information representing whether each of a plurality of carriers supports each of one or more paging groups. Then, the base station selects a paging transmission carrier for the mobile station from among at least one paging carrier corresponding to the paging group allocated to the mobile station and transmits the paging message through the paging transmission carrier.
    Type: Application
    Filed: April 20, 2011
    Publication date: January 31, 2013
    Inventors: Soojung Jung, Eunkyung Kim, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • ENCRYPTION METHOD AND APPARATUS FOR DIRECT COMMUNICATION BETWEEN TERMINALS
    Publication number: 20130022199
    Abstract: A method for performing direct communication between terminals includes: a transmitting terminal's encrypting data using a direct communication transport encryption key (DTEK) for direct communication; and transmitting the encrypted data to a receiving terminal, wherein the DTEK is managed in an SA (security association) defined within the transmitting terminal or the receiving terminal.
    Type: Application
    Filed: July 18, 2012
    Publication date: January 24, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung KIM, Sung Cheol CHANG, Sung Kyung KIM, Won-Ik KIM, Mi Young YUN, Hyun LEE, Chul Sik YOON, Kwang Jae LIM
  • TERMINAL OF SUPPORTING DIRECT COMMUNICATION USING INFRA COMMUNICATION AND DIRECT COMMUNICATION METHOD OF THE SAME
    Publication number: 20130016646
    Abstract: A method in which a first terminal supports direct communication using infracommunication includes setting at least one direct communication link with at least one second terminal, setting at least one traffic connection with a base station, and forwarding data that is transmitted through the at least one direct communication link from the at least one second terminal to the at least one traffic connection or forwarding data that is transmitted through the at least one traffic connection from the base station to the at least one direct communication link.
    Type: Application
    Filed: July 12, 2012
    Publication date: January 17, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Cheol CHANG, Mi Young YUN, Eunkyung KIM, Sung Kyung KIM, Won-Ik KIM, Hyun LEE, Chul Sik YOON, Kwang Jae LIM, Seokki KIM
  • METHOD FOR COMMUNICATION OF BASE STATION AND TERMINAL
    Publication number: 20130017817
    Abstract: A method of performing communication of a terminal includes the terminal transmitting state information thereof to a base station, and the terminal receiving a mode change request from the base station when the terminal is selected by the base station.
    Type: Application
    Filed: July 11, 2012
    Publication date: January 17, 2013
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Won-Ik Kim, Eunkyung Kim, Sung Kyung Kim, Sung Cheol Chang, Jae Sun Cha, Mi Young Yun, Hyun Lee, Chul Sik Yoon, Kwang Jae Lim
  • METHOD FOR TRANSMITTING INFORMATION OF NEIGHBORING BASE STATION IN WIRELESS COMMUNICATION SYSTEM
    Publication number: 20120329506
    Abstract: Provided is a method for obtaining superframe header (SFH) information in a neighboring base station advertisement (NBR-ADV) message at a terminal. In the method, a NBR-ADV message having SFH information set per each carrier is received from a serving base station. The SFH information of each carrier is obtained from the NBR-ADV message. In the obtaining the SFH information of each carrier, SFH information of a corresponding carrier is obtained based on SFH information of a previous carrier when a predetermined field is set as a predetermined value.
    Type: Application
    Filed: March 4, 2011
    Publication date: December 27, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Cheol Chang, Eunkyung Kim, Jae Sun Cha, Soojung Jung, Hyun Lee, Chul Sik Yoon
  • METHOD AND APPARATUS FOR MANAGING CONFIGURATION INFORMATION OF MULTICAST AND BROADCAST SERVICE
    Publication number: 20120327935
    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: Application
    Filed: March 4, 2011
    Publication date: December 27, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung Kim, Jae Sun Cha, Soojung Jung, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • BASE STATION, MOBILE STATION, PAGING MESSAGE TRANSMITTING METHOD, AND PAGING MESSAGE RECEIVING METHOD
    Publication number: 20120327856
    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: Application
    Filed: March 4, 2011
    Publication date: December 27, 2012
    Inventors: Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Method and device for transmitting scanning start information of different radio access network
    Patent number: 8331940
    Abstract: A method and device for providing reference information for starting scanning a different radio access network to a terminal in a boundary area is provided. A receiver supporting a plurality of access systems includes a receiving circuit for receiving a scanning threshold from a transmitter, a first measuring module for measuring channel quality of a serving cell, and a second measuring module for starting scanning a neighboring cell that is a different radio access network when channel quality of the serving cell is less than the channel quality threshold. The receiver may further include a handover module for performing handover to the neighboring cell when the channel quality of the neighboring cell measured by the second measuring module is greater than that of the serving cell.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: December 11, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Won-Ik Kim, Sung-Geun Jin, Sung Cheol Chang, Chul Sik Yoon, Jee Hwan Ahn
  • Terminal, method for handover thereof, and supporting method for handover of base station
    Patent number: 8331321
    Abstract: A method for handover according to the present invention includes: requesting information on femto cells that are accessible by the terminal from a macro base station that manages the macro cells; receiving the femto cell information from the macro base station; and scanning neighboring femto cells based on the femto cell information.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: December 11, 2012
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Won-Ik Kim, Sung Cheol Chang, Kwang Jae Lim, Chul Sik Yoon, Jee Hwan Ahn
  • Femtocell search method for macro to femto handover
    Patent number: 8326304
    Abstract: The present invention relates to a femtocell search method for a handover from a macrocell to a femtocell. The present invention relates to a method for a terminal that accesses a macrocell to search a femtocell in an environment where a plurality of femtocells are overlapped in one macrocell. The terminal searches a femtocell by using a dummy preamble in order to minimize the size of neighbor cell lists broadcasted from the macrocell to the terminal. Therefore, according to the present invention, an MAC overhead can be minimized by eliminating neighbor femtocell lists in a mobile neighbor advertisement (MOB_NBR_ADV) message broadcasted from the macrocell, and the terminal can search a femtocell with a minimum scanning load by checking only a femtocell dummy preamble in a dedicated symbol of the macrocell.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: December 4, 2012
    Assignees: Samsung Electronics Co., Ltd., Electronics & Telecommunications Research Institute
    Inventors: Won-Ik Kim, Kwang Jae Lim, Sung Cheol Chang, Sung-Geun Jin, Hyun Lee, Chul Sik Yoon
  • METHOD AND TERMINAL FOR PERFORMING DIRECT COMMUNICATION BETWEEN TERMINALS
    Publication number: 20120294245
    Abstract: Disclosed is a method for a first terminal to perform direct communication between terminals, the method including performing direct communication with at least one second terminal by using resources allocated for direct communication between terminals, the resources including a synchronization channel used for frequency synchronization and time synchronization between terminals, and the synchronization channel including a synchronization channel preamble used for at least one of preamble detection, time offset estimation, frequency offset estimation, and channel estimation.
    Type: Application
    Filed: May 18, 2012
    Publication date: November 22, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Cheol CHANG, Eunkyung Kim, Hyun Lee, Sung Kyung Kim, Won-Ik Kim, Chul Sik Yoon, Kwang Jae Lim, Young-Ho Jung, Mi-young Yun, Jihoon Choi, Seokki Kim
  • METHOD AND APPARATUS FOR UPDATING MULTICAST AND BROADCAST SERVICE
    Publication number: 20120287839
    Abstract: When MBS information is updated, a base station transmits a first message to a terminal. The first message includes a service flow update indicator for indicating a scheme for describing a current MBS identifier (ID) and flow ID to be updated, information on the current MBS ID and flow ID described by the scheme indicated by the service flow update indicator, and new MBS information. The terminal transmits a second message to the base station in response to the first message.
    Type: Application
    Filed: January 11, 2011
    Publication date: November 15, 2012
    Applicant: Electronics And Telecommunications Research Institute
    Inventors: Eunkyung Kim, Jae Sun Cha, Soojung Jung, Sung Cheol Chang, Kwang Jae Lim, Hyun Lee, Chul Sik Yoon
  • METHOD FOR COMMUNICATION OF BASE STATION, TERMINAL AND RELAY STATION
    Publication number: 20120281615
    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: Application
    Filed: May 2, 2012
    Publication date: November 8, 2012
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Eunkyung KIM, Sung Kyung Kim, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon, Kwang Jae Lim