Patents by Inventor Choong-Il Yeh

Choong-Il Yeh 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: 20200288463
    Abstract: A method for indicating preemption in a communication system is disclosed. A method for operating a terminal comprises the steps of: receiving, from a base station, information indicating a first resource area, to which a preemption-capable resource belongs, for transmission of first data; receiving resource allocation information of second data from the base station; performing a monitoring operation for detecting a PI indicating a preempted resource for transmission of the first data in the first resource area, when the first resource area overlaps with a second resource area indicated by the resource allocation information; and performing decoding on the basis of the detected PI. Therefore, the performance of the communication system may be improved.
    Type: Application
    Filed: September 12, 2018
    Publication date: September 10, 2020
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jung Hoon LEE, Jung Bin KIM, Cheul Soon KIM, Sung Hyun MOON, CHOONG IL YEH
  • Publication number: 20200221428
    Abstract: A method for receiving a PDCCH by a terminal in a mobile communication system may comprise the steps of: receiving a first PDCCH including first DCI from a base station through a first PDCCH search space; and receiving a second PDCCH including second DCI from the base station through a second PDCCH search space, wherein the first DCI and second DCI are for scheduling the same PDSCH for the same TB or TBs associated with the same HARQ process, are for scheduling different PDSCHs for the same TB or TBs associated with the same HARQ process, or are for scheduling different PDSCHs for different TBs or TBs associated with different HARQ processes. In addition, the first DCI and second DCI may be received from the base station within a time window.
    Type: Application
    Filed: August 8, 2018
    Publication date: July 9, 2020
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung Hyun MOON, Cheul Soon KIM, Jung Hoon LEE, Min Hyun KIM, Ji Hung KIM, Ju Ho PARK, CHOONG IL YEH, Jun Hwan LEE
  • Publication number: 20190082456
    Abstract: A method of transmitting a grant-free uplink data channel (physical uplink shared channel (PUSCH)) (GF-PUSCH), performed in a terminal, includes determining a resource (GF-PUSCH resource) for transmission of the GF-PUSCH and an identifier (DM-RS ID) of a demodulation reference signal (DM-RS) included in the GF-PUSCH; when an uplink traffic arrives, encoding the uplink traffic into a transport block (TB); generating the DM-RS based on the DM-RS ID, and transmitting the GF-PUSCH including the TB and the DM-RS to a base station through the GF-PUSCH resource; and receiving, from the base station, a group hybrid automatic repeat request acknowledgement (HARQ-ACK) information in which ACK or negative acknowledgement (ACK/NACK) information for the GF-PUSCH of the terminal and ACK/NACK information for at least one GF-PUSCH of at least one other terminal are multiplexed, through a downlink control information (DCI).
    Type: Application
    Filed: September 7, 2018
    Publication date: March 14, 2019
    Inventors: Cheul Soon KIM, Sung Hyun MOON, Choong Il YEH, Jung Hoon LEE
  • Patent number: 9510161
    Abstract: Disclosed are methods and apparatuses for public safety communication. A method comprises transmitting a groupcast setup request message to a base station; receiving an uplink grant message including information on groupcast resources in response to the groupcast setup request message from the base station; and transmitting data to be transmitted to receiving terminals belonging to a group to which the transmitting terminal belongs to the base station through the groupcast resources. Therefore, public safety communication can be efficiently performed in a wireless communication system.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: November 29, 2016
    Assignee: ELECTRONICS & TELECOOMUNICATIONS RESEARCH INSTITUTE
    Inventors: Choong Il Yeh, Jae Young Ahn, Tae Gyun Noh, Dong Hyun Ahn
  • Patent number: 9503171
    Abstract: Disclosed is a method for transmitting radio frequency signals. In the method according to the present invention, a plurality of antenna groups may be arranged for achieving array gain and multiplexing gain at the same time, and the plurality of antenna groups are located far from each other so that they have no correlation, and antennas of the same group are located adjacent to each other so that they have correlation. Accordingly, system capacity as well as capacity of data channel and control channel may be significantly increased through mitigation of inter-cell interference and enhancement of cell edge performance.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: November 22, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choong Il Yeh, Jae Young Ahn
  • Patent number: 9426795
    Abstract: Disclosed is a method for configuring and transmitting control channel for radio communication. A method for configuring control channel comprises a step of configuring a control channel by using a plurality of tiles, wherein numbers of resource elements in the plurality of tiles are configured to be the same or different. If a method for transmitting control information comprising a small number of bits according to the present invention is used, quality of communication and efficiency of resource may be increased at the same time.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: August 23, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choong Il Yeh, Tae Gyun Noh, Jae Young Ahn
  • Patent number: 9398554
    Abstract: Disclosed is a method for network synchronization acquisition in a wireless network. A synchronized node transmits a first synchronization reference signal, a second synchronization reference signal, and a beacon according to a predetermined period. A non-synchronized node receives the first synchronization reference signal, the second synchronization signal, and the beacon from at least one transmitting node. Then, the non-synchronized node acquires network synchronization temporarily based on the first synchronization reference signal, decodes the beacon, and checks whether at least one transmitting node exists or not. Then, the non-synchronized node requests a network synchronization forwarding service or a time adjustment, and acquires synchronization based on the provided network synchronization forwarding service.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: July 19, 2016
    Assignee: Electronics & Telecommunications Research Institute
    Inventors: Choong Il Yeh, Jae Young Ahn, Tae Gyun Noh
  • Patent number: 9215693
    Abstract: Provided is a radio resource management method for device-to-device communication. The resource management method for device-to-device communication includes dividing a plurality of connection identifiers (CIDs) into N (N is a natural number) number of groups, dividing the resources for device-to-device communication into N number of sub-bands corresponding to the N number of groups, and allocating resources by mapping CIDs respectively belonging to the N number of groups to resources of sub-bands respectively corresponding to the groups. Therefore, according to the resource management method, by dividing the whole frequency band into a plurality of sub-bands, a communication range may be extended, a low-power device may be accommodated, granularity of resources may be improved, and flexibility of resource management may be obtained.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: December 15, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Young Ahn, Choong Il Yeh
  • Publication number: 20150009881
    Abstract: Disclosed are methods and apparatuses for public safety communication. A method comprises transmitting a groupcast setup request message to a base station; receiving an uplink grant message including information on groupcast resources in response to the groupcast setup request message from the base station; and transmitting data to be transmitted to receiving terminals belonging to a group to which the transmitting terminal belongs to the base station through the groupcast resources. Therefore, public safety communication can be efficiently performed in a wireless communication system.
    Type: Application
    Filed: July 7, 2014
    Publication date: January 8, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Choong Il YEH, Jae Young AHN, Tae Gyun NOH, Dong Hyun AHN
  • Publication number: 20150011230
    Abstract: Disclosed are a coordinator based device-to-device communication method and an apparatus for the same. The communication method may comprise transmitting a synchronization signal and system information to a plurality of terminals; configuring wireless links with the plurality of terminals based on a random access procedure; receiving a scheduling message for a D2D communication from a first terminal among the plurality of terminals; allocating, to the first terminal, a transmission resource to be used for the first terminal to transmit data based on the scheduling request message; and allocating, to a second terminal performing the D2D communication with the first terminal among the plurality of terminals, a reception resource to be used for the second terminal to receive the data transmitted from the first terminal.
    Type: Application
    Filed: July 7, 2014
    Publication date: January 8, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Tae Gyun NOH, Jae Young AHN, Choong Il YEH
  • Publication number: 20140355597
    Abstract: Disclosed is a method for network synchronization acquisition in a wireless network. A synchronized node transmits a first synchronization reference signal, a second synchronization reference signal, and a beacon according to a predetermined period. A non-synchronized node receives the first synchronization reference signal, the second synchronization signal, and the beacon from at least one transmitting node. Then, the non-synchronized node acquires network synchronization temporarily based on the first synchronization reference signal, decodes the beacon, and checks whether at least one transmitting node exists or not. Then, the non-synchronized node requests a network synchronization forwarding service or a time adjustment, and acquires synchronization based on the provided network synchronization forwarding service.
    Type: Application
    Filed: May 30, 2014
    Publication date: December 4, 2014
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Choong Il YEH, Jae Young AHN, Tae Gyun NOH
  • Patent number: 8848700
    Abstract: Disclosed is device-to-device communication based on a cellular communication network. A method of operating a terminal capable of supporting D2D (device to device) communication based on a cellular communication network may include: determining whether to perform central control D2D communication or distributed control D2D communication; and performing the distributed control D2D communication, or requesting a setting for the central control D2D communication to a base station on the basis of the determination. With the D2D communication based on the cellular communication network, the cellular communication, the central control D2D communication, or the distributed control D2D communication may flexibly and selectively operate in the cellular network.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 30, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jae Young Ahn, Choong Il Yeh, Kyoung Seok Lee
  • Patent number: 8805283
    Abstract: In a method of mitigating inter-cell interference, terminals are grouped into groups. A base station transmits data to a first terminal belonging to a first group among the groups, without cooperation with a neighboring base station. The base station transmits data to a second terminal belonging to a second group among the groups, through cooperation with the neighboring base station.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: August 12, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Choong Il Yeh, Young Seog Song, Seung Joon Lee, Byung-Jae Kwak, Ji Hyung Kim, Dong Seung Kwon
  • Publication number: 20140192768
    Abstract: Disclosed is a method for transmitting radio frequency signals. In the method according to the present invention, a plurality of antenna groups may be arranged for achieving array gain and multiplexing gain at the same time, and the plurality of antenna groups are located far from each other so that they have no correlation, and antennas of the same group are located adjacent to each other so that they have correlation. Accordingly, system capacity as well as capacity of data channel and control channel may be significantly increased through mitigation of inter-cell interference and enhancement of cell edge performance.
    Type: Application
    Filed: January 3, 2014
    Publication date: July 10, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Choong Il YEH, Jae Young AHN
  • Patent number: 8718167
    Abstract: Disclosed is a method for channel estimation and feedback in a wireless communication system that estimates a channel for each transmission antenna using an orthogonal frequency division multiplexing (OFDM) impulse signal.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Choong il Yeh, Dong Seung Kwon, Jee Hwan Ahn
  • Patent number: 8619714
    Abstract: An access point allocates a resource for ranging to an access terminal included therein, and receives a ranging channel that includes an identifier of the access terminal and a plurality of pilots. The AP checks the access terminal by using the received identifier, and measures a round trip delay of the access terminal based on the received pilots.
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: December 31, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choong Il Yeh, Byung-Jae Kwak, Dong Seung Kwon, Jee Hwan Ahn
  • Patent number: 8611314
    Abstract: A method of transmitting a synchronization channel is provided. A plurality of block sequences for determining at least one block identifier is generated. A plurality of subcarriers of a synchronization channel are divided into a polarity of blocks, and the plurality of block sequences are allocated to the blocks to generate a synchronization signal.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: December 17, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Joon Lee, Choong Il Yeh, Dong Seung Kwon
  • Patent number: 8611441
    Abstract: The present invention relates to a transmission interference cancellation method for a multiuser MIMO system. The method includes decomposing a channel matrix to represent formulae of permutation matrixes including a first matrix and a second matrix; determining an optimal permutation matrix among a plurality of available permutation matrixes using a norm of multiplication of the second matrix and a transmitting data vector; and determining the second matrix using the determined optimal permutation matrix and calculating a transmitting precoding vector using the determined second matrix and the transmitting data vector.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: December 17, 2013
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Choong Il Yeh, Seung Joon Lee, Dong Seung Kwon
  • Patent number: 8537917
    Abstract: In a symbol mapping method, transmission data is encoded to generate information bits and redundancy bits. An average LLR value of bits on which the information bits are mapped is different from an average LLR value of bits on which the redundancy bits are mapped.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: September 17, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Dong Seung Kwon, Byung-Jae Kwak, Bum-Soo Park, Choong Il Yeh, Young Seog Song, Seung Joon Lee, Ji Hyung Kim
  • Patent number: 8526531
    Abstract: The present invention relates to an apparatus and a method for selection of a precoding matrix. In the present invention, a precoding matrix to enable an effective signal-to-noise ratio (ESNR) to have a maximum value with respect to a signal vector that requires retransmission is selected in a codebook and fed back to a transmitter. Accordingly, since the effective signal-to-noise ratio has the maximum value after the signal vector is retransmitted, it is possible to minimize a reception error probability of retransmission.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: September 3, 2013
    Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute
    Inventors: Dong Seung Kwon, Byung-Jae Kwak, Young Seog Song, Seung Joon Lee, Ji Hyung Kim, Choong Il Yeh, Wooram Shin, Chung Gu Kang, Jin-Woo Kim