Patents by Inventor Changsoon Choi

Changsoon Choi 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: 20190335322
    Abstract: A method and apparatus allocates an IP address between terminals in a wireless communication network in which terminals directly communicate with each other in a wireless scheme without an AP. The method for allocating an Internet Protocol (IP) address of a wireless terminal capable of performing P2P communication, includes a discovery step of discovering at least one external terminal capable of performing the P2P communication and connecting with the at least one discovered external terminal by the wireless terminal; and a negotiation step of negotiating and determining with the external terminal which external terminals become a group owner and a group client in a P2P group, respectively by the wireless terminal. One of the discovery step and the negotiation step includes transmitting an IP address to be allocated to the group client to the external terminal from the wireless terminal.
    Type: Application
    Filed: July 11, 2019
    Publication date: October 31, 2019
    Inventors: Jongmu Choi, Changsoon Kim, Hakkwan Kim, Namju Cho
  • Patent number: 10446330
    Abstract: The present invention relates to an elastic fiber electrode including a hybrid fiber prepared by coating a carbon nanotube sheet on a polymer fiber, in which the hybrid fiber is in a yarn form having a coiled structure, and the carbon nanotube sheet makes a wrinkled surface, and a coil- or spring-type elastic fiber electrode manufactured by coiling a hybrid nanofiber prepared by coating a carbon nanotube sheet on a polymer fiber has excellent mechanical and electrical properties. In particular, the elastic fiber electrode has increased porosity by depositing manganese dioxide on a surface thereof, thereby enhancing electrochemical performance. Thus, a micro-supercapacitor using the elastic fiber electrode has high current density and excellent capacitance retention, may maintain the electrochemical characteristics even after being subjected to various deformations, such as bending, coiling, or weaving, and has high elasticity and reversible behaviors, thus providing stable capacitance.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: October 15, 2019
    Assignee: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventors: Seonjeong Kim, Changsoon Choi
  • Patent number: 10397773
    Abstract: A method and apparatus allocates an IP address between terminals in a wireless communication network in which terminals directly communicate with each other in a wireless scheme without an AP. The method for allocating an Internet Protocol (IP) address of a wireless terminal capable of performing P2P communication, includes a discovery step of discovering at least one external terminal capable of performing the P2P communication and connecting with the at least one discovered external terminal by the wireless terminal; and a negotiation step of negotiating and determining with the external terminal which external terminals become a group owner and a group client in a P2P group, respectively by the wireless terminal. One of the discovery step and the negotiation step includes transmitting an IP address to be allocated to the group client to the external terminal from the wireless terminal.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: August 27, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jongmu Choi, Changsoon Kim, Hakkwan Kim, Namju Cho
  • Patent number: 10236946
    Abstract: A beamforming device is provided. The beamforming device comprises: a beam deriving unit for deriving, among multiple reception beams, a first reception beam receiving, from a terminal, the first largest reception signal and a second reception beam receiving, from the terminal, the second largest reception signal; and a control unit for estimating the direction of the terminal on the basis of a ratio value between the size of the reception signal received through the first reception beam and the size of the reception signal received through the second reception beam.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: March 19, 2019
    Assignee: SK TELECOM CO., LTD.
    Inventors: Haesung Park, Changsoon Choi
  • Patent number: 10194335
    Abstract: The disclosure relates to a wireless communication technology, and more specifically, to a method and an apparatus for connecting a wireless backhaul by generating reception status information, and interference information or location information, on the basis of a beamforming signal at the time of configuration of a wireless backhaul between base stations through beamforming.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: January 29, 2019
    Assignee: SK TELECOM CO., LTD.
    Inventors: Changsoon Choi, Haesung Park
  • Publication number: 20180269946
    Abstract: The present disclosure relates to a wireless communications technology. Specifically, the present disclosure provides a method and device for reducing terminal interference due to sidelobes on the basis of channel state information (CSI) in a hybrid beamforming architecture.
    Type: Application
    Filed: May 12, 2016
    Publication date: September 20, 2018
    Inventors: Changsoon CHOI, Haesung PARK
  • Publication number: 20180205421
    Abstract: A beamforming device is provided. The beamforming device comprises: a beam deriving unit for deriving, among multiple reception beams, a first reception beam receiving, from a terminal, the first largest reception signal and a second reception beam receiving, from the terminal, the second largest reception signal; and a control unit for estimating the direction of the terminal on the basis of a ratio value between the size of the reception signal received through the first reception beam and the size of the reception signal received through the second reception beam.
    Type: Application
    Filed: June 30, 2016
    Publication date: July 19, 2018
    Inventors: Haesung PARK, Changsoon CHOI
  • Publication number: 20180139628
    Abstract: The disclosure relates to a wireless communication technology, and more specifically, to a method and an apparatus for connecting a wireless backhaul by generating reception status information, and interference information or location information, on the basis of a beamforming signal at the time of configuration of a wireless backhaul between base stations through beamforming.
    Type: Application
    Filed: January 16, 2018
    Publication date: May 17, 2018
    Inventors: Changsoon CHOI, Haesung PARK
  • Publication number: 20170309409
    Abstract: The present invention relates to an elastic fiber electrode including a hybrid fiber prepared by coating a carbon nanotube sheet on a polymer fiber, in which the hybrid fiber is in a yarn form having a coiled structure, and the carbon nanotube sheet makes a wrinkled surface, and a coil- or spring-type elastic fiber electrode manufactured by coiling a hybrid nanofiber prepared by coating a carbon nanotube sheet on a polymer fiber has excellent mechanical and electrical properties. In particular, the elastic fiber electrode has increased porosity by depositing manganese dioxide on a surface thereof, thereby enhancing electrochemical performance. Thus, a micro-supercapacitor using the elastic fiber electrode has high current density and excellent capacitance retention, may maintain the electrochemical characteristics even after being subjected to various deformations, such as bending, coiling, or weaving, and has high elasticity and reversible behaviors, thus providing stable capacitance.
    Type: Application
    Filed: October 1, 2015
    Publication date: October 26, 2017
    Applicant: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventors: Seonjeong KIM, Changsoon CHOI
  • Patent number: 8849332
    Abstract: An apparatus for controlling a node of a wireless communication system has a traffic load determiner, a cooperation capacity determiner and a power control unit. The traffic load determiner determines a traffic load in the wireless communication system and the cooperation capacity determiner determines an available cooperation capacity of the node with another node of the wireless communication system. Further, the power control unit activates or deactivates an antenna of a node based on the determined traffic load and the determined available capacity.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: September 30, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Luca Scalia, Thorsten Biermann, Changsoon Choi, Wolfgang Kellerer, Kazuyuki Kozu
  • Patent number: 8837943
    Abstract: A communication system has a plurality of nodes adapted to provide for a communication with one or more devices, a central node, a passive optical network having a multiplexer/demultiplexer device adapted to demultiplex a first optical signal from the central node to the plurality of nodes, and to multiplex second optical signals from one or more of the nodes, each node having allocated a wavelength for generating its optical signal, wherein for directly transmitting signals from one node to at least one of the other nodes, the one node is adapted to generate an optical signal at the wavelength allocated to the at least one of the other nodes, the optical signal including the signal to be transmitted, and wherein the multiplexer/demultiplexer device of the passive optical network is adapted to combine the optical signal from the one node with the first optical signal.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: September 16, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Changsoon Choi, Qing Wei, Thorsten Biermann
  • Publication number: 20130337818
    Abstract: An apparatus for determining a control unit of a plurality of control units in a wireless communication system for controlling cooperative transmission or reception between base stations and a wireless device includes a cluster feasibility processor configured to receive a cluster feasibility response from at least one other control unit than a control unit controlling a base station serving a wireless device containing information of a feasible wireline cluster of base stations controllable by the at least one other control unit; and a control unit selector configured to select the at least one control unit for controlling a cooperative transmission or a cooperative reception between at least two base stations and the wireless device based on the at least one received information of the feasible wireline cluster of base stations controllable by the at least one other control unit.
    Type: Application
    Filed: August 16, 2013
    Publication date: December 19, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Thorsten BIERMANN, Changsoon CHOI, Luca SCALIA
  • Publication number: 20130294288
    Abstract: A method for coordinated multipoint communication in a wireless communication network, which has a plurality of base stations and a backhaul network connecting the plurality of base stations, includes selecting one or more cooperating base stations for a coordinated multipoint communication for a mobile unit serviced by a serving base station, determining whether the backhaul network supports a coordinated multipoint technique selected for a cooperating base station, and in case the backhaul network is not sufficient to support a coordinated multipoint technique for one or more of the cooperating base stations, reconfiguring the backhaul network to meet the requirements of the coordinated multipoint technique.
    Type: Application
    Filed: July 9, 2013
    Publication date: November 7, 2013
    Inventors: Changsoon CHOI, Luca SCALIA, Thorsten BIERMANN, Shinji MIZUTA
  • Publication number: 20130244670
    Abstract: An apparatus for determining a core network configuration of a wireless communication system comprises cluster determiner. A core network of a wireless communication system has a plurality of base stations, a plurality of wireline links between the base stations and at least one control unit for controlling a cluster of base stations of the plurality of base stations. The cluster determiner determines as the core network configuration at least one cluster of base stations linked by wireline links and controlled by a same control unit based on a predefined basic network configuration, so that latencies between each base station of the cluster and the control unit of the cluster are below a maximal allowable latency. The predefined basic network configuration represents information about all base stations of a core network to be configured and about possible wireline links between the base stations.
    Type: Application
    Filed: April 19, 2013
    Publication date: September 19, 2013
    Applicant: NTT DOCOMO, Inc.
    Inventors: Thorsten BIERMANN, Luca SCALIA, Changsoon CHOI, Kazuyuki KOZU, Wolfgang KELLERER
  • Publication number: 20120177373
    Abstract: A communication system has a plurality of nodes adapted to provide for a communication with one or more devices, a central node, a passive optical network having a multiplexer/demultiplexer device adapted to demultiplex a first optical signal from the central node to the plurality of nodes, and to multiplex second optical signals from one or more of the nodes, each node having allocated a wavelength for generating its optical signal, wherein for directly transmitting signals from one node to at least one of the other nodes, the one node is adapted to generate an optical signal at the wavelength allocated to the at least one of the other nodes, the optical signal including the signal to be transmitted, and wherein the multiplexer/demultiplexer device of the passive optical network is adapted to combine the optical signal from the one node with the first optical signal.
    Type: Application
    Filed: January 9, 2012
    Publication date: July 12, 2012
    Inventors: Changsoon Choi, Qing Wei, Thorsten Biermann
  • Publication number: 20120165063
    Abstract: An apparatus for controlling a node of a wireless communication system has a traffic load determiner, a cooperation capacity determiner and a power control unit. The traffic load determiner determines a traffic load in the wireless communication system and the cooperation capacity determiner determines an available cooperation capacity of the node with another node of the wireless communication system. Further, the power control unit activates or deactivates an antenna of a node based on the determined traffic load and the determined available capacity.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 28, 2012
    Inventors: Luca Scalia, Thorsten Biermann, Changsoon Choi, Wolfgang Kellerer, Kazuyuki Kozu