Patents by Inventor Cheol-Su Kim

Cheol-Su Kim 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).

  • Patent number: 11706635
    Abstract: Technologies directed to a wireless network with a cascaded star topology with multiple devices at multiples nodes are described. In one wireless network, multiple devices are manufactured as a common device type and deployed at different nodes of the wireless network. The devices are configured to operate as a base station (BS) role, a gateway (GW) role, a relay (RL) role, or a customer station (STA) role. The nodes can be a base station node (BSN), a relay node (RLN), or a customer premises equipment (CPE) node. One node can be a first-tier hub of the cascaded star topology and another node can be a second-tier hub of the cascaded star topology.
    Type: Grant
    Filed: December 9, 2019
    Date of Patent: July 18, 2023
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Tzung-I Lee, Omar Fawazhashim Zakaria, Subram Narasimhan, Cheol Su Kim
  • Patent number: 11659588
    Abstract: Technologies directed to prioritized channel coordination in a multi-tier wireless network are described. One method includes identifying a first group of wireless devices located in a first geographical area using physical proximity information. The method includes, for a first wireless device having a highest priority among the wireless device in the first geographical area, determining a penalty value for each channel of a plurality of available channels and selecting a first channel having a lowest penalty value. The method includes, for a second wireless device having a second-highest priority, determining a penalty value for each of the remaining channels in the plurality of available channels and selecting a second channel, from the remaining channels, having a lowest penalty value. The method includes sending to the first wireless device information about the first channel and sending to the second wireless device information about the second channel.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: May 23, 2023
    Assignee: Amazon Technologies, Inc.
    Inventors: Kun Ting Tsai, Nathan Labadie, Cheol Su Kim, King Shaw, Sarang Wagholikar, Omar Fawazhashim Zakaria
  • Patent number: 11658634
    Abstract: Technologies directed to a wireless device with RF port impedance detection using concurrent radios are described. One wireless device includes an impedance detection circuit with a bi-directional RF coupler and switching circuitry. A processing device at least two radios, at least two RF ports, and an impedance detection circuit. The impedance detection circuit is configured to measure a first receive signal strength indicator (RSSI) value of a first reflected signal. The first reflected signal corresponding to a first signal sent by one of the at least two radios. The impedance detection circuit determines that the first RSSI value exceeds a threshold. The threshold represents an impedance mismatch condition at or beyond at least one of the two RF ports. The processing device sends a first indicative of the impedance mismatch condition to a second device.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: May 23, 2023
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Kun Ting Tsai, Cheol Su Kim, Kalyan Teja Posani, Omar Fawazhashim Zakaria
  • Patent number: 11606791
    Abstract: Technologies directed to multi-tier coordinated dynamic frequency selection (DFS) service in a multi-tier wireless network are described. One method includes receiving, by a first wireless device, first data associated with a first set of DFS channels. The first wireless device performs a CAC on each DFS channel of the first set of DFS channels in a specified order. The first wireless device identifies a second set of DFS channels in which no radar event is found during the respective CAC and generates second data associated with the second set of DFS channels. The first wireless device receives a first request for the second data from a second wireless device.
    Type: Grant
    Filed: May 11, 2021
    Date of Patent: March 14, 2023
    Assignee: Amazon Technologies, Inc.
    Inventors: Kun Ting Tsai, Nathan Labadie, Cheol Su Kim, Sarang Wagholikar, Omar Fawazhashim Zakaria
  • Patent number: 11546015
    Abstract: Technologies directed to cable-loss compensation are described. An apparatus includes a triplexer, a front-end module (FEM) circuit, and a control circuit. The triplexer is coupled to a radio frequency (RF) cable. The triplexer receives a first RF signal and a DC power signal from a device via the RF cable and sends a detection signal being indicative of a transmit power level of the first RF signal to the device via the RF cable. The transmit power level includes an insertion loss of the RF cable. The FEM circuit is coupled to the triplexer and includes a power amplifier (PA). The control circuit is coupled to the triplexer and measures the transmit power level of the first RF signal and converts the first RF signal into the detection signal. The control circuit sends the detection signal back to the device via the RF cable and enables the PA.
    Type: Grant
    Filed: May 17, 2021
    Date of Patent: January 3, 2023
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Cheol Su Kim, Ravi Ichapurapu, Kalyan Teja Posani, Omar Fawazhashim Zakaria, In Chui Hyun
  • Patent number: 11483844
    Abstract: A wireless mesh network includes a first wireless access point (WAP) device designated as a primary device, where the first WAP device provides network connectivity to a plurality of client devices over a first dynamic frequency selection (DFS) channel. A second WAP device is designated as a secondary device to the first WAP device on the first DFS channel. In response to detection of a radar event by the first WAP device: the first WAP device transitions to being the secondary device on the first DFS channel; the second WAP device transitions to being the primary device on the first DFS channel; and the second WAP device performs a channel availability check (CAC) on a second DFS channel and communicates availability of the second DFS channel to the first WAP device.
    Type: Grant
    Filed: November 19, 2020
    Date of Patent: October 25, 2022
    Assignee: Amazon Technologies, Inc.
    Inventors: Kun Ting Tsai, Kiran Kumar Edara, Sarang Wagholikar, Omar Fawazhashim Zakaria, Ashish Kumar Shukla, Cheol Su Kim
  • Patent number: 11469804
    Abstract: Technologies directed to sectorized analog beam searching are described. One method includes a first wireless device receiving a first destination address of a second wireless device, a first angle value corresponding to a first direction, and a second angle value corresponding to a second direction. The first wireless device generates a first signal beam transmitted in the first direction and spanning a first geographic region and receives an RSSI value corresponding to the first signal beam. The first wireless generates a second signal beam transmitted in the second direction and spanning a second geographic region and receives a second RSSI value corresponding to the second signal beam. The first wireless device determines that the first RSSI value is greater than the second RSSI value. The first wireless device determines, using a third signal beam a third angle value corresponding to a third direction located within the first geographic region.
    Type: Grant
    Filed: September 1, 2021
    Date of Patent: October 11, 2022
    Assignee: Amazon Technologies, Inc.
    Inventors: Kun Ting Tsai, Manvendra Sharma, Tzung-I Lee, Cheol Su Kim, Sarang Wagholikar, Omar Fawazhashim Zakaria, Nathan Labadie
  • Publication number: 20220264681
    Abstract: Technologies directed to a wireless network device with a single hardware architecture that supports multiple devices roles through software configuration are described. One wireless network device includes a housing with an RF connector and a circuit board with a first radio coupled to an internal antenna and a second radio coupled to an external antenna via the RF connector. The second antenna is mounted on an exterior surface of the building and coupled to the RF connector via an RF cable. The wireless network device receives a command identifying a device role for the wireless network device and configures itself according to the device role using device setting.
    Type: Application
    Filed: May 4, 2022
    Publication date: August 18, 2022
    Inventors: Nathan Labadie, Reshma Suresh, Ali Mirkamali, Cheol Su Kim, Omar Fawazhashim Zakaria, Kwok Shing Lee, Kalyan Teja Posani
  • Patent number: 11417686
    Abstract: The present disclosure relates to a display substrate. The display substrate may include a substrate, a first lower gate electrode, an insulation pattern, a first insulation layer, and a first active pattern. The first lower gate electrode may be disposed on the substrate. The insulation pattern may be disposed on and patterned to correspond to the first lower gate electrode and may include a silicon nitride. The first insulation layer may be disposed on the insulation pattern and may include a silicon oxide. The first active pattern may be on the first insulation layer and formed of oxide semiconductor and may include a first channel region overlapping the first lower gate electrode and a first wiring region disposed on a side of the first channel region.
    Type: Grant
    Filed: September 21, 2020
    Date of Patent: August 16, 2022
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Se Myung Kwon, Duk Young Kim, Young Kuk Kim, Cheol Su Kim, Yu Ri Oh
  • Patent number: 11375561
    Abstract: Technologies directed to a wireless network device with a single hardware architecture that supports multiple devices roles through software configuration are described. One wireless network device includes a housing with an RF connector and a circuit board with a first radio coupled to an internal antenna and a second radio coupled to an external antenna via the RF connector. The second antenna is mounted on an exterior surface of the building and coupled to the RF connector via an RF cable. The wireless network device establishes a first wireless link between the first radio and a radio of a second device via the first antenna and a second wireless link between the second radio and a radio of a third device via the second antenna. The second device can be a second wireless network device that is programmed to operate as a gateway, the gateway being mounted outside of the building.
    Type: Grant
    Filed: December 9, 2019
    Date of Patent: June 28, 2022
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Reshma Suresh, Ali Mirkamali, Cheol Su Kim, Omar Fawazhashim Zakaria, Kwok Shing Lee, Kalyan Teja Posani
  • Patent number: 11251381
    Abstract: A flexible display device includes a substrate, a plurality of first pixels, and a plurality of second pixels. The substrate includes a foldable bending region and a non-foldable non-bending region. Each first pixel is disposed on the bending region. Each first pixel is spaced apart from an adjacent first pixel by a first distance. Each second pixel is disposed on the non-bending region. Each second pixel is spaced apart from an adjacent second pixel by a second distance. The first distance is greater than the second distance.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: February 15, 2022
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventor: Cheol-Su Kim
  • Publication number: 20220012761
    Abstract: The present invention relates to a customized noise relay system capable of providing noise services with functional usefulness and emotional value to users by providing various noises created by people in an urban living environment or a natural environment according to the characteristics of wired/wireless Internet services. The customized noise relay system according to a first embodiment of the present invention includes a noise management center 1100 for directly outputting a noise to a noise user accessing an Internet site via wired or wireless connection, wherein the noise management center 1100 includes a noise management unit 1110 for managing noises; a noise list providing unit 1120 for displaying a list of noises managed by the noise management unit 1110 to allow a user accessing an Internet site linked to the noise management center 1100 to check the list; and a noise output unit 1130 for outputting a noise selected by the user from the displayed noise list.
    Type: Application
    Filed: November 13, 2019
    Publication date: January 13, 2022
    Inventor: Cheol Su KIM
  • Patent number: 11218203
    Abstract: Technologies directed to coordinated dynamic analog beamforming are described. One method includes receiving, by a digital controller of a first wireless device, a data packet, the data packet comprising a destination address of a second wireless device. The method further includes retrieving, from memory, beamformer configuration data associated with the destination address, the beamformer configuration data comprising a phase shifter angle value for a radiation pattern. The method sends, to a beamformer circuit, the phase shifter angle value, the beamformer circuit comprises a power splitter and a set of phase shifters (e.g., at least four). The method causes the set of phase shifters to steer the radiation pattern of electromagnetic energy, radiated by an antenna array of elements, at the phase shifter angle value and sends the data packet to the second wireless device via the antenna array.
    Type: Grant
    Filed: January 29, 2020
    Date of Patent: January 4, 2022
    Assignee: Amazon Technologies, Inc.
    Inventors: Tzung-I Lee, Kun Ting Tsai, Haritha Tamvada, Kwok Shing Lee, Cheol Su Kim, Omar Fawazhashim Zakaria, In Chul Hyun, Ali Mirkamali, Dan Richard Brukwinski
  • Patent number: 11121693
    Abstract: Technologies directed to a wireless device with RF port impedance detection using concurrent radios are described. One wireless device includes an impedance detection circuit with a bi-directional RF coupler and switching circuitry. A processing device controls the switching circuitry to i) couple the bi-directional RF coupler between a first radio and a first RF port and a second radio and a second RF port. The processing device causes a first radio to send a first signal and a second radio to measure a first receive signal strength indicator (RSSI) value of a first reflected signal. The processing device determines that the first RSSI value exceeds a threshold, the threshold representing an impedance mismatch condition at or beyond the first RF port. The processing device sends a message indicative of the impedance mismatch condition to a second device.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: September 14, 2021
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Kun Ting Tsai, Cheol Su Kim, Kalyan Teja Posani, Omar Fawazhashim Zakaria
  • Publication number: 20210280613
    Abstract: The present disclosure relates to a display substrate. The display substrate may include a substrate, a first lower gate electrode, an insulation pattern, a first insulation layer, and a first active pattern. The first lower gate electrode may be disposed on the substrate. The insulation pattern may be disposed on and patterned to correspond to the first lower gate electrode and may include a silicon nitride. The first insulation layer may be disposed on the insulation pattern and may include a silicon oxide. The first active pattern may be on the first insulation layer and formed of oxide semiconductor and may include a first channel region overlapping the first lower gate electrode and a first wiring region disposed on a side of the first channel region.
    Type: Application
    Filed: September 21, 2020
    Publication date: September 9, 2021
    Inventors: Se Myung KWON, Duk Young KIM, Young Kuk KIM, Cheol Su KIM, Yu Ri OH
  • Patent number: 11075465
    Abstract: Technologies for wireless network devices with surface-link antenna systems mounted on exterior surfaces of buildings are described. One wireless network device includes a housing with a circuit board and a first antenna port. A processor, a first antenna, a first wireless local area network (WLAN) radio, and a second WLAN radio are disposed on the circuit board. The first WLAN radio communicates with a radio of a client device using the first antenna over a first line-of-sight (LOS) or non-LOS wireless link (e.g., 2.4 GHz) inside the building. The second WLAN radio communicates with a radio of a second wireless network device using the second antenna over a second LOS wireless link (e.g., 5 GHz) that is external to the building. The first antenna is located inside the building and the second antenna is located along an exterior surface of the building.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: July 27, 2021
    Assignee: Amazon Technologies, Inc.
    Inventors: Tzung-I Lee, Omar Fawazhashim Zakaria, Kwok Shing Lee, Kalyan Teja Posani, Ali Mirkamali, Cheol Su Kim, In Chul Hyun
  • Patent number: 11043985
    Abstract: Technologies directed to cable-loss compensation are described. An apparatus includes a triplexer, a front-end module (FEM) circuit, and a control circuit. The triplexer is coupled to a radio frequency (RF) cable. The triplexer receives a first RF signal and a DC power signal from a device via the RF cable and sends a detection signal being indicative of a transmit power level of the first RF signal to the device via the RF cable. The transmit power level includes an insertion loss of the RF cable. The FEM circuit is coupled to the triplexer and includes a power amplifier (PA). The control circuit is coupled to the triplexer and measures the transmit power level of the first RF signal and converts the first RF signal into the detection signal. The control circuit sends the detection signal back to the device via the RF cable and enables the PA.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: June 22, 2021
    Assignee: Amazon Technologies, Inc.
    Inventors: Nathan Labadie, Cheol Su Kim, Ravi Ichapurapu, Kalyan Teja Posani, Omar Fawazhashim Zakaria, In Chul Hyun
  • Publication number: 20210176805
    Abstract: Technologies directed to a wireless network device with a single hardware architecture that supports multiple devices roles through software configuration are described. One wireless network device includes a housing with an RF connector and a circuit board with a first radio coupled to an internal antenna and a second radio coupled to an external antenna via the RF connector. The second antenna is mounted on an exterior surface of the building and coupled to the RF connector via an RF cable. The wireless network device establishes a first wireless link between the first radio and a radio of a second device via the first antenna and a second wireless link between the second radio and a radio of a third device via the second antenna. The second device can be a second wireless network device that is programmed to operate as a gateway, the gateway being mounted outside of the building.
    Type: Application
    Filed: December 9, 2019
    Publication date: June 10, 2021
    Inventors: Nathan Labadie, Reshma Suresh, Ali Mirkamali, Cheol Su Kim, Omar Fawazhashim Zakaria, Kwok Shing Lee, Kalyan Teja Posani
  • Publication number: 20210176648
    Abstract: Technologies directed to a wireless network with a cascaded star topology with multiple devices at multiples nodes are described. In one wireless network, multiple devices are manufactured as a common device type and deployed at different nodes of the wireless network. The devices are configured to operate as a base station (BS) role, a gateway (GW) role, a relay (RL) role, or a customer station (STA) role. The nodes can be a base station node (BSN), a relay node (RLN), or a customer premises equipment (CPE) node. One node can be a first-tier hub of the cascaded star topology and another node can be a second-tier hub of the cascaded star topology.
    Type: Application
    Filed: December 9, 2019
    Publication date: June 10, 2021
    Inventors: Nathan Labadie, Tzung-I Lee, Omar Fawazhashim Zakaria, Subram Narasimhan, Cheol Su Kim
  • Patent number: 10887026
    Abstract: Technologies directed to antenna disconnection detection of distributed radio frequency (RF) ports in a wireless network are described. One method receives data from the wireless devices and generates an RSSI matrix including multiple elements, each storing a receive signal strength indicator (RSSI) value indicative of a signal strength of a wireless link between a transmitter-receiver pair. The method identifies a characteristic pattern in the RSSI matrix. The characteristic pattern includes i) two or more RSSI values in a same row being less than the threshold value and ii) two or more RSSI values in a same column being less than the threshold value. The method stores an indication that an antenna is disconnected from an RF port and sends a command to the second wireless device that causes the second wireless device to disable a radio that is coupled to the RF port.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: January 5, 2021
    Assignee: Amazon Technologies, Inc.
    Inventors: Kun Ting Tsai, Nathan Labadie, Cheol Su Kim, Haritha Tamvada, Omar Fawazhashim Zakaria