Patents Assigned to SK Telecom Co., Ltd.
  • Method and apparatus for encoding/decoding video
    Patent number: 11509937
    Abstract: Disclosed is a method and apparatus for encoding/decoding a video. According to an embodiment, provided is a method of setting a level for each of one or more regions, including decoding a definition syntax element related to level definition and a designation syntax element related to target designation from a bitstream; defining one or more levels based on the definition syntax element; and setting a target level designated by the designation syntax element among the defined levels for a target region designated by the designation syntax element.
    Type: Grant
    Filed: April 9, 2019
    Date of Patent: November 22, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jeong-yeon Lim, Jae Seob Shin, Sun Young Lee, Se Hoon Son, Tae Young Na, Jae Il Kim
  • Method and device for subband coding frequency conversion unit, and method and device for image encoding/decoding using same
    Patent number: 11509894
    Abstract: The present disclosure provides a method and apparatus for subband-coding a frequency conversion unit and a video encoding/decoding method a video encoding/decoding apparatus using the same. The method and the apparatus for subband-coding the frequency conversion unit include generating an encoding stream by splitting the frequency conversion unit into one or more frequency domains, generating frequency domain encoding information according to whether there is a non-zero frequency coefficient in each frequency domain, scanning the frequency coefficient of each frequency domain to generate a frequency domain frequency coefficient stream, and binarizing and encoding the frequency domain encoding information and the scanned frequency domain frequency coefficient stream.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: November 22, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jinhan Song, Jeongyeon Lim, Haekwang Kim, Joohee Moon, Yunglyul Lee, Jongki Han, Byeungwoo Jeon
  • Wireless communication method and wireless communication terminal for spatial reuse operation
    Patent number: 11503636
    Abstract: The present invention relates a wireless communication method and a wireless communication terminal for supporting a spatial reuse operation of an overlapping basic service set to efficiently use a wireless resource. To this end, provided are a base wireless communication terminal including: a processor; and a communication unit, wherein the processor receives a PHY protocol data unit (PPDU) through the communication unit, determines whether the PPDU contains an intra-BSS frame or contains an inter-BSS frame based on preamble information of the PPDU, and performs either a first operation or a second operation distinct from each other according to a determination result and a wireless communication method using the same.
    Type: Grant
    Filed: December 5, 2020
    Date of Patent: November 15, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Geonjung Ko, Juhyung Son, Woojin Ahn, Jinsam Kwak
  • Method and server device for providing internet of things platform service
    Patent number: 11483391
    Abstract: A method and a server device for providing an IoT platform service are provided. According to at least one aspect of the present disclosure, a method of providing an IoT platform service, which is performed by an IoT platform server apparatus, generates a shadow device corresponding to an IoT device, manages state information of the IoT device through the corresponding shadow device, and registers and administers a specification (i.e., a device descriptor) regarding common features of a plurality of devices.
    Type: Grant
    Filed: August 25, 2021
    Date of Patent: October 25, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventor: Karam Ko
  • Wireless communication method and wireless communication terminal for spatial reuse operation
    Patent number: 11483865
    Abstract: The present invention relates a wireless communication method and a wireless communication terminal for supporting a spatial reuse operation of an overlapping basic service set to efficiently use a wireless resource. To this end, provided are a base wireless communication terminal including: a processor; and a communication unit, wherein the processor receives a PHY protocol data unit (PPDU) through the communication unit, determines whether the PPDU contains an intra-BSS frame or contains an inter-BSS frame based on preamble information of the PPDU, and performs either a first operation or a second operation distinct from each other according to a determination result and a wireless communication method using the same.
    Type: Grant
    Filed: December 5, 2020
    Date of Patent: October 25, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Geonjung Ko, Juhyung Son, Woojin Ahn, Jinsam Kwak
  • Multi-user(MU) transmission for soliciting acknowledgement(ACK) from a target base station
    Patent number: 11477844
    Abstract: In order to efficiently schedule data transmission of a plurality of terminals, the wireless communication terminal receives a trigger frame indicating uplink multi-user transmission, and transmits an uplink multi-user PPDU (PLCP Protocol Data Unit) in response to the received trigger frame. In this case, the trigger frame and the non-legacy preamble of the uplink multi-user PPDU include remaining TXOP (Transmission Opportunity) time information of the uplink multi-user transmission process.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: October 18, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Juhyung Son, Jinsam Kwak, Geonjung Ko
  • Image projection device
    Patent number: 11474420
    Abstract: An image projection device includes: a panel unit configured to emit light rays; a projection optical system configured to receive the light rays emitted from the panel unit and to refract the light rays; a reflection unit having a reflection surface for receiving the light rays refracted by the projection optical system and reflecting the light rays; and a screen unit configured to display an image upon receiving the light rays reflected from the reflection surface. The panel unit, the projection optical system, the reflection unit, and the screen unit are arranged such that a distance of a shortest path among paths extending from the panel unit to the reflection unit through the projection optical system along a predetermined linear axis is longer than a distance of a longest path among paths extending from the reflection unit to the screen unit along the predetermined linear axis.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: October 18, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Dong Youb Sinn, Yong Woo Bae, Seung Ho Shin, Jae Hwang Yu, Hak Soon Lee, Guk Chan Lim, Ku Ik Chung, Jin Yong Han
  • Wireless communication method and wireless communication terminal
    Patent number: 11477799
    Abstract: Provided is a wireless communication terminal. The wireless communication terminal includes: a transceiver configured for transmitting/receiving a wireless signal; and a processor configured for controlling an operation of the wireless communication terminal. The transceiver receives a first frame indicating that there is data to be transmitted from a base wireless communication terminal to a plurality of wireless communication terminals including the wireless communication terminal and receives data based on the first frame. The base wireless communication terminal is any one wireless communication terminal different from the plurality of wireless communication terminals.
    Type: Grant
    Filed: August 16, 2020
    Date of Patent: October 18, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Woojin Ahn, Yongho Kim, Jinsam Kwak, Juhyung Son
  • Wireless communication method using frame aggregation and wireless communication terminal using same
    Patent number: 11470506
    Abstract: A method for constructing an aggregated frame for efficient wireless communication in a high-density environment and a wireless communication method using the same is provided. The wireless communication method may include: generating an aggregated MPDU (A-MPDU) including a plurality of MAC protocol data unit (MPDU) groups to which independent modulation and coding schemes (MCSs) are applied, respectively; and transmitting the generated A-MPDU through the transceiver and a wireless communication terminal may use the same.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: October 11, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Juhyung Son, Jinsam Kwak, Geonjung Ko
  • Wireless communication terminal and wireless communication method for random access-based uplink multi-user transmission
    Patent number: 11470643
    Abstract: Provided are a wireless communication terminal including: a processor; and a communication unit, wherein the processor obtains a backoff counter for an OFDMA-based random access of the terminal, wherein the backoff counter is obtained within a range of a contention window for the uplink OFDMA-based random access, receives a trigger frame indicating an uplink multi-user transmission, when one or more resource unit(s) in which random access can be performed is indicated by the trigger frame, decrements the backoff counter based on a number of resource units(s) in which random access can be performed, and when the backoff counter is 0 or decremented to 0, performs an uplink multi-user transmission through a selected resource unit among the resource units(s) and a wireless communication method using the same.
    Type: Grant
    Filed: November 22, 2020
    Date of Patent: October 11, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Woojin Ahn, Juhyung Son, Jinsam Kwak, Geonjung Ko
  • Wireless communication method and wireless communication terminal, which use discontinuous channel
    Patent number: 11470595
    Abstract: The present invention relates to a wireless communication method and a wireless communication terminal using a non-contiguous channel. To this end, provided are a wireless communication terminal including a processor and a transceiver, wherein the processor receives a wireless packet through the communication unit, obtains total bandwidth information indicated via a bandwidth field of HE-SIG-A of the received packet, obtains information of an unassigned resource unit via at least one of the bandwidth field of the HE-SIG-A and a subfield of HE-SIG-B of the received packet, and decodes the received packet based on the total bandwidth information and the information of the unassigned resource unit and a wireless communication method using the same.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: October 11, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Juhyung Son, Jinsam Kwak, Geonjung Ko, Woojin Ahn
  • Holographic image display device
    Patent number: 11454930
    Abstract: A holographic image display device according to one embodiment comprises: an image display unit on which a holographic image is displayed; and a spatial impression providing unit which forms a space surrounding the holographic image, and includes a transparent color material such that the space looks colored and the holographic image can be recognized from the outside.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: September 27, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Yong Woo Bae, Dongyoub Sinn, Hak-Soon Lee, Jinsoo Jeon, Gukchan Lim
  • Wireless communication terminal and wireless communication method for random access-based uplink multi-user transmission
    Patent number: 11445546
    Abstract: Provided are a wireless communication terminal including: a processor; and a communication unit, wherein the processor obtains a backoff counter for an OFDMA-based random access of the terminal, wherein the backoff counter is obtained within a range of a contention window for the uplink OFDMA-based random access, receives a trigger frame indicating an uplink multi-user transmission, when one or more resource unit(s) in which random access can be performed is indicated by the trigger frame, decrements the backoff counter based on a number of resource units(s) in which random access can be performed, and when the backoff counter is 0 or decremented to 0, performs an uplink multi-user transmission through a selected resource unit among the resource units(s) and a wireless communication method using the same.
    Type: Grant
    Filed: November 23, 2020
    Date of Patent: September 13, 2022
    Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., SK TELECOM CO., LTD.
    Inventors: Woojin Ahn, Juhyung Son, Jinsam Kwak, Geonjung Ko
  • Method and apparatus for vehicle-to-vehicle message service
    Patent number: 11438742
    Abstract: A method and an apparatus for vehicle-to-vehicle or V2V message service are disclosed. In at least one aspect, a method of operating a V2V message service apparatus in a V2V communication system includes when a first vehicle equipped with the V2V message service apparatus enters a particular road link, subscribing the first vehicle to a V2V message server with the particular road link as a topic, and receiving an event message including an event-situated road link as a topic from the V2V message server, and determining whether to issue an alarm corresponding to the event message based on a preceding and trailing relationship between the first vehicle and a second vehicle that published the event message.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: September 6, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Hongbeom Ahn, Sang Shin Lee, Young Lak Kim, Sungmin Baek
  • Inter-prediction method and image decoding device
    Patent number: 11425391
    Abstract: Disclosed are an inter-prediction method and an video decoding device. One embodiment of the present invention provides an inter-prediction method executed in an video decoding device, including deriving a motion vector of a current block based on motion information decoded from a bitstream; acquiring reference samples of a first reference block by using the motion vector, wherein reference samples of an external region located outside a reference picture among the first reference block are acquired from a corresponding region corresponding to the external region within the reference picture; and predicting the current block based on the acquired reference samples.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: August 23, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jeong Yeon Lim, Se Hoon Son, Sun Young Lee, Tae Young Na
  • Method and apparatus for encoding and decoding video using skip mode
    Patent number: 11425392
    Abstract: A video encoding apparatus includes: an inter prediction unit to determine a motion parameter of a current block and generate a predicted block of the current block, by performing a motion estimation on the current block; and an optimal mode determining unit to set a prediction mode of the current block as a SKIP mode when (i) the motion parameter of the current block is identical to a motion parameter of a candidate block among a plurality of candidate blocks and (ii) all-zero coefficients result from a transform and a quantization performed on a residual data block representing the difference between the current block and the predicted block.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: August 23, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Jeongyeon Lim, Joong Gunn Park, Byeungwoo Jeon, Haekwang Kim, Joohee Moon, Yunglyul Lee, Jongki Han, Jungyoup Yang, Jaehwan Kim, Kwanghyun Won, Hoyoung Lee
  • Device and method for calibrating camera for vehicle
    Patent number: 11417018
    Abstract: In accordance with an aspect of the present disclosure, there is provided a method of calibrating a camera for a vehicle, comprising: obtaining attitude angle information of the vehicle by using a traveling direction of the vehicle obtained based on a satellite signal, and a vertical direction from ground obtained based on a high definition map; obtaining attitude angle information of the camera mounted on the vehicle by matching an image captured by the camera to the high definition map; and obtaining coordinate system transformation information between the vehicle and the camera by using the attitude angle information of the vehicle and the attitude angle information of the camera.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: August 16, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Taekyeong Lee, Seongsoo Lee
  • Method and apparatus for managing mobility in wireless communication system
    Patent number: 11419032
    Abstract: The present disclosure in an aspect provides a method of managing mobility of a UE in a wireless communication system, including 1) determining in an RRC inactive state (an RRC inactive mode), whether to change a serving cell that is currently attached, 2) when determining to change the serving cell, receiving a system information from a target cell, and checking, based on the system information, whether a base station that controls the serving cell is identical to or different from a base station that controls the target cell, and 3) depending on identity or difference between the base station that controls the target cell and the base station that controls the serving cell, performing i) releasing an RRC-connection to thereby transition into an idle state, or ii) a cell change procedure to the target cell.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: August 16, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventor: Sangsoo Jeong
  • Base station apparatus and data packet transmission method
    Patent number: 11419180
    Abstract: Disclosure is a BS apparatus and a method of transmitting a data packet capable of supporting smooth transmission of a data packet by defining a new fronthaul interface considering a structure of expanding/designing processing functions of a radio module of a 5G split BS including not only an RF processing function but also a processing function on a higher layer.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: August 16, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Min Soo Na, Gi Wan Choi, Chang Soon Choi
  • Method and apparatus for providing next generation network service in heterogeneous network environment
    Patent number: 11412564
    Abstract: A method and an apparatus are disclosed for providing a next-generation network service in a heterogeneous network environment. The present disclosure in some embodiments provides a method and an apparatus, which can operate a conventional network and a next-generation network in an interworking arrangement with high reliability, and can process high-speed data communications by using the next-generation network.
    Type: Grant
    Filed: October 1, 2020
    Date of Patent: August 9, 2022
    Assignee: SK TELECOM CO., LTD.
    Inventors: Sangsoo Jeong, Chang-soon Choi