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 supporting security in muliticast communication
    Patent number: 8842832
    Abstract: A method of supporting a security for a multicast communication is provided in a mobile station. The mobile station shares an MAK with a base station, derives a prekey based on a first parameter including the MAK, and derives a multicast security key including an MTEK based on a second parameter including the prekey, and decrypts a multicast traffic using the multicast security key.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: September 23, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Sung Kyung Kim, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Transmitting device, transmitting method, and receiving method for multicast and broadcast service
    Patent number: 8830877
    Abstract: A transmitting device for a multicast and broadcast service according to an embodiment of the present invention includes: an encoder that receives data to generate parity; an ARQ block generator that generates a first automatic repeat request (ARQ) block by dividing the data and generates a second ARQ block by dividing the parity; a PDU generator that generates a first protocol data unit (PDU) including the first ARQ block and a second protocol unit (PDU) including the second ARQ block; and a transmitter that transmits the first PDU and the second PDU to a plurality of terminals.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: September 9, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung-Geun Jin, Sung Cheol Chang, Won-Ik Kim, Hyun Lee, Chul Sik Yoon
  • Apparatus and method for transmitting and receiving multicast broadcast service
    Patent number: 8825794
    Abstract: A multicast broadcast service (MBS) receiving device establishes an MBS connection with an MBS transmitting device through a connection establishment message. When it is determined to receive MBS right after establishing the MBS connection, the MBS receiving device starts to receive the MBS right after establishing the MBS connection. When it is determined to not receive MBS right after establishing the MBS connection, the MBS receiving device transmits an MBS report message to the MBS transmitting device and then starts to receive the MBS.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: September 2, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Method for controlling power saving mode in group communication
    Patent number: 8824348
    Abstract: A method of controlling power saving modes of a plurality of terminals joining in a group communication by a base station is provided. The base station establishes a group call connection with the plurality of terminals, and establishes a same power saving mode pattern for the plurality of terminals.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: September 2, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung Kyung Kim, Sung Cheol Chang, Eunkyung Kim, Hyun Lee, Chul Sik Yoon
  • METHOD AND APPARATUS FOR DETECTING COLLISION IN WIRELESS MULTI-ACCESS CHANNEL
    Publication number: 20140233411
    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: Application
    Filed: February 14, 2014
    Publication date: August 21, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Sung Geun JIN, Byung Jae KWAK, Jin Kyeong KIM, Sung Cheol CHANG, Seung Chan BANG
  • SYNCHRONIZATION METHOD AND APPARATUS IN DEVICE-TO-DEVICE DIRECT COMMUNICATION
    Publication number: 20140211781
    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: Application
    Filed: January 27, 2014
    Publication date: July 31, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyung Jin KIM, Chanho YOON, Soojung JUNG, Sung Kyung KIM, Seungkwon CHO, Sung Cheol CHANG, DongSeung KWON
  • Device for managing of base station and method for managing thereof
    Patent number: 8787923
    Abstract: A management device of a stopping or moving base station includes: an information acquisition unit that acquires first information about wireless environment from a neighboring base station and that acquires second information about the wireless environment by connecting to a backbone network; a position estimating unit that estimates a position of the neighboring base station based on the first information; and an operation condition selection unit that selects radio resources based on at least one of the first information and the second information.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: July 22, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Won-Ik Kim, Sung Kyung Kim, Hyun-Jae Kim, Chul Sik Yoon, Jee Hwan Ahn
  • Apparatus and method for transmitting and receiving MBS data
    Patent number: 8750193
    Abstract: An MBS transmitting apparatus allocates a plurality of subbands of an MBS transmission carrier to an MBS region and a non-MBS region and generates region allocation information of the MBS region and the non-MBS region. The MBS transmitting apparatus allocates the subbands, allocated to the MBS region, to at least one MBS zone and generates MBS zone allocation information of the at least one MBS zone. The MBS transmitting apparatus transmits the region allocation information and the MBS zone allocation information and transmits MBS data through the subbands allocated to the MBS region.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: June 10, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Apparatus and method for transmitting and receiving multicast broadcast service data
    Patent number: 8743898
    Abstract: An MBS transmitting apparatus allocates a plurality of time intervals of an MBS transmission carrier to an MBS region and a non-MBS region and generates region allocation information of the MBS region and the non-MBS region. The MBS transmitting apparatus allocates the time intervals, allocated to the MBS region, to one or more MBS zones and generates MBS zone allocation information of the one or more MBS zones. The MBS transmitting apparatus transmits the region allocation information and the MBS zone allocation information and transmits the MBS data through the time intervals allocated to the MBS region.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: June 3, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Soojung Jung, Jae Sun Cha, Sung Cheol Chang, Hyun Lee, Chul Sik Yoon
  • Method for operation of femto base station based on radio access system
    Patent number: 8738095
    Abstract: A method for opearation of femto base station (BS) is provided. The method includes: transmitting the first low duty operation (LDO) pattern information, which includes length information of an available interval (AI) where the femto BS is activated and length information of an unavailable interval (UAI) where the femto BS is inactivated, to user equipment (UE) and operating based on the first LDO pattern where the first LDO cycle, a sequence of the AI and the UAI, is repeatedly arranged. The first LDO pattern information further including a superframe offset as information for leading a start point of the first LDO cycle.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: May 27, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eunkyung Kim, Jae Sun Cha, Soojung Jung, JuHee Kim, Kwang Jae Lim, Hyun Lee, Won-Ik Kim, Sung Cheol Chang, Chul Sik Yoon, Namgi Kim
  • Method and terminal for performing direct communication between terminals
    Patent number: 8730832
    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: Grant
    Filed: May 18, 2012
    Date of Patent: May 20, 2014
    Assignee: 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
  • Device and method for managing base station and terminal
    Patent number: 8725183
    Abstract: A base station management method according to the present invention is a method for managing an operation mode of a base station, and includes determining whether a terminal exists in a cell managed by the base station and operating in a low duty operation mode (LDM) when no terminal exists in the cell.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: May 13, 2014
    Assignees: Samsung Electroncs Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Won-Ik Kim, Jae Sun Cha, Sung Cheol Chang, Kwang Jae Lim, Hyun-Jae Kim, Sung Kyung Kim, Chul Sik Yoon
  • Apparatus for measuring radio environment of base station and method for measuring the same
    Patent number: 8718660
    Abstract: A method and apparatus for measuring a radio environment of a base station is provided. The method includes respectively selecting one or more frames for measuring a radio environment in a first mode in which an Over-The-Air Receiver (OTAR) of the base station is initialized and a second mode in which the OTAR is active, continuously measuring the radio environment based on the selected one or more frames in the first mode and intermittently measuring the radio environment based on the selected one or more frames in the second mode.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Hyun-Jae Kim, Won-Ik Kim, Sung Kyung Kim, Chul Sik Yoon, Jee Hwan Ahn
  • Method for broadcasting and method for receiving location information of base station
    Patent number: 8718679
    Abstract: A plurality of location-based service advertisement messages including location information of base stations belonging to each network are broadcasted with different timing in multiple wireless networks. Therefore, a terminal receives only at least on location-based service advertisement message corresponding to an accessible network among the plurality of location-based service advertisement messages.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Won-Ik Kim, Sung-Geun Jin, Sung Cheol Chang, Kwang Jae Lim, Chul Sik Yoon, Jee Hwan Ahn
  • Method for controlling interference
    Patent number: 8717914
    Abstract: A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system is provided. The method includes receiving interference amount information on a first region of a downlink frame from the terminal, determining an interference amount estimate for the first region based on the received interference amount information, comparing the determined interference amount estimate with an interference amount tolerance for the first region; and transmitting an interference indicator requesting reduction in transmission power for the first region to the plurality of neighboring base stations when the interference amount estimate exceeds the interference amount tolerance.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Sung Kyung Kim, Sung Cheol Chang, Hyun-Jae Kim, Won-Ik Kim, Chul Sik Yoon, Jee Hwan Ahn
  • Transmitting apparatus and retransmitting method
    Patent number: 8713395
    Abstract: In a retransmitting method, at least one ARQ block included in a first PDU is fragmented into a plurality of ARQ sub-blocks, and at least one second PDU is generated from the plurality of ARQ sub-blocks. The second PDU includes a payload including an extended header and at least some of a plurality of ARQ sub-blocks. The extended header includes a field representing a sequence number of the first ARQ sub-block belonging to the payload.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: April 29, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Sun Cha, Kwang Jae Lim, Sung Cheol Chang, Chul Sik Yoon
  • DISCOVERY SIGNAL TRANSMITTED IN DIRECT COMMUNICATION SYSTEM, AND METHOD OF TRANSMITTING/RECEIVING THE DISCOVERY SIGNAL
    Publication number: 20140112235
    Abstract: A discovery signal that a first device joining in direct communication broadcasts through a radio channel is provided. The discovery signal includes a first field representing whether the discovery signal is a signal for discovering a device or a signal for discovering a service, and a second field including one of device identifier information of the first device and service information of a service that the first device provides according to a value of the first field.
    Type: Application
    Filed: October 21, 2013
    Publication date: April 24, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Soojung JUNG, Sung Kyung KIM, Seungkwon CHO, Chanho YOON, Hyung Jin KIM, Sung Cheol CHANG, DongSeung KWON
  • METHOD AND DEVICE FOR MANAGING CONTENTION WINDOW BASED ON TRANSMISSION ERROR DETECTION
    Publication number: 20140112153
    Abstract: Disclosed is a method and apparatus for managing a contention window based on detection of a transmission error, the method including: recognizing a transmission failure of data in the case of transmitting data using a contention-based wireless channel access method; verifying whether the transmission failure of data occurs due to a channel error or a collision by a contention between terminals; and determining a value of a contention window set in association with data transmission based on the verification result.
    Type: Application
    Filed: October 24, 2013
    Publication date: April 24, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Sung Geun JIN, Byung Jae KWAK, Jin Kyeong KIM, Sung Cheol CHANG, Seung Chan BANG
  • Device and method for managing base station and terminal
    Patent number: 8682359
    Abstract: A base station management method according to the present invention is a method for managing an operation mode of a base station, and includes determining whether a terminal exists in a cell managed by the base station and operating in a low duty operation mode (LDM) when no terminal exists in the cell.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: March 25, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Won-Ik Kim, Jae Sun Cha, Sung Cheol Chang, Kwang Jae Lim, Hyun-Jae Kim, Sung Kyung Kim, Chul Sik Yoon
  • Method for transmitting signals
    Patent number: 8675600
    Abstract: A signal receiving method includes allocating a communication resource corresponding to a mobile station over a plurality of frames, transmitting allocation information on the communication resource to the mobile station, and receiving a transmitted signal through the communication resource. Therefore, the resource allocated on the frequency axis is minimized by allocating the resource to the mobile station over a plurality of frames, and the resource is allocated within the limited power of the mobile station, thereby improving radio performance.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: March 18, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics & Telecommunications Research Institute
    Inventors: Sung Cheol Chang, Kwang Jae Lim, Sung Kyung Kim, Hyun Lee, Chul Sik Yoon