Patents by Inventor Satoshi Takeda

Satoshi Takeda 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: 20200107245
    Abstract: The present invention is designed so that communication is performed appropriately in radio communication systems that support different numerologies than existing LTE systems. A receiving section that receives a downlink control channel, and a control section that controls the detection of search spaces that serve as candidates for allocating the downlink control channel are provided, and the control section controls the detection of a common search space and a user-specific search space, in which different subcarrier spacings and/or different transmission cycles are configured.
    Type: Application
    Filed: December 14, 2017
    Publication date: April 2, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Qin Mu
  • Publication number: 20200106546
    Abstract: The present invention is designed to adequately control the transmission of uplink control information (UCI) using UL control channels. According to the present invention, a user terminal has a transmission section that transmits uplink control information (UCI), and a control section that determines a format of an uplink (UL) control channel that is used to transmit the UCI, from a plurality of formats, including a first format, in which the UCI and a reference signal are frequency-division-multiplexed, and a second format, in which the UCI and the reference signal are time-division-multiplexed.
    Type: Application
    Filed: December 14, 2017
    Publication date: April 2, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang
  • Patent number: 10609652
    Abstract: The present invention is designed to improve DL received quality in future radio communication systems. According to the present invention, a user terminal has a receiving section that receives a downlink (DL) data channel, which is demodulated using a user terminal-specific reference signal, a transmission section that transmits a transmission power control (TPC) command, which is used to control transmission power of the DL data channel and/or the reference signal; and a control section that controls transmission of the TPC command.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: March 31, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20200100241
    Abstract: The present invention is designed so that, when a CP-OFDM waveform is supported in the UL in addition to DFT-spreading OFDM waveform, transmission of UCI can still be controlled adequately. According to the present invention, a user terminal has a transmission section that transmits uplink control information (UCI), and a control section that controls transmission of the UCI based on a waveform of an uplink (UL) data channel or based on indication information provided via higher layer signaling and/or downlink control information (DCI).
    Type: Application
    Filed: April 27, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang
  • Publication number: 20200100272
    Abstract: According to one aspect of the present invention, a user terminal has a transmission section that performs UL grant-free transmission, in which UL data is transmitted without a UL transmission indication from a radio base station, and a control section that controls the UL grant-free transmission based on a configuration of the UL grant-free transmission, identified based on a physical layer signaling, and the transmission section transmits a delivery acknowledgment in response to receipt of the physical layer signaling. According to one aspect of the present invention, even when UL grant-free transmission is employed, the decline in communication throughput and the like can be reduced.
    Type: Application
    Filed: May 12, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20200100240
    Abstract: In order to support the transmission of uplink control information adequately even when shortened TTIs are used, a user terminal according to one aspect of the present invention has a transmitting section that transmits uplink control information by using a shortened TTI, in which a length of a transmission time interval (TTI) is shorter than 1 ms, and a control section that controls transmission of the uplink control information by using a given uplink control channel format for the shortened TTI, based on the number of bits of uplink control information transmitted in the shortened TTI.
    Type: Application
    Filed: March 23, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou, Huiling Jiang
  • Publication number: 20200100220
    Abstract: A base station is disclosed including a processor that maps one or more control channel elements (CCEs) in a downlink control channel to one or more resource units that are obtained by an interleaver for interleaving indexes of a plurality of resource units in a control resource set, and a transmitter transmits the downlink control channel. Each of the one or more resource units are being defined as a plurality of resource element groups (REGs). A transmitter transmits the downlink control channel. In other aspects, a terminal and a radio communication method are disclosed.
    Type: Application
    Filed: March 20, 2018
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Qin Mu, Liu Liu, Huiling Jiang
  • Publication number: 20200100188
    Abstract: A user equipment for performing radio communication with a base station in accordance with dynamic TDD (Time Division Duplex) is disclosed. An aspect of the present invention relates to a user equipment including a transmission and reception unit that transmits a radio signal to and receives a radio signal from a base station in accordance with dynamic TDD; and a transmission power configuration unit that configures uplink transmission power toward the base station, wherein the transmission power configuration unit configures the uplink transmission power in accordance with a dedicated scheme, a group common scheme or a combined scheme of the dedicated scheme and the group common scheme.
    Type: Application
    Filed: May 2, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Kazuki Takeda, Satoshi Nagata, Shaozhen Guo
  • Publication number: 20200100219
    Abstract: The present invention is designed to improve the robustness of downlink control information. According to the present invention, a user terminal has a receiving section that receives first downlink control information (DCI), which is transmitted using a first beam, and a control section that controls receipt of second downlink control information (DCI), which is transmitted using a plurality of second beams, based on the first DCI.
    Type: Application
    Filed: March 21, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Qin Mu, Liu Liu, Xiaolin Hou, Huiling Jiang
  • Publication number: 20200099567
    Abstract: A user apparatus that uses a plurality of subcarrier spacings is disclosed. The user apparatus includes a receiver that receives a synchronization signal and system information. The user apparatus further includes a processor that determines, on a basis of the subcarrier spacings, positions of symbols to which periodic blocks including the synchronization signal and the system information are mapped. In other aspects, a base station apparatus and a communication method are also disclosed.
    Type: Application
    Filed: May 2, 2017
    Publication date: March 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Patent number: 10602431
    Abstract: To perform communication using a plurality of cells using different transmission time intervals (TTIs) in an appropriate manner, a user terminal includes a control section for controlling the communication using the plurality of cells including at least a first cell and a second cell using a shorter TTI than a TTI of the first cell, and a reception section for receiving information broadcasted from each of the first and second cells. The user terminal receives system information and/or paging information as the information broadcasted from each cell.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: March 24, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20200092037
    Abstract: Provided are a user terminal, a feedback method at the user terminal, a base station and a method at the base station. The feedback method at the user terminal includes steps of: calculating first information related to receiving signal quality; combining the first information and a response signal to a hybrid automatic repeat request (HARQ) to be transmitted to a base station to generate a combined signal; carrying out signal processing on the combined signal to generate second information; and transmitting the second information to the base station.
    Type: Application
    Filed: January 5, 2018
    Publication date: March 19, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Xin WANG, Xiaolin HOU, Chongning NA, Huiling JIANG, Yuichi KAKISHIMA, Kazuaki TAKEDA, Satoshi NAGATA
  • Publication number: 20200092875
    Abstract: The present invention is designed so that frequency bands can be used efficiently depending on what capabilities UEs have. According to one aspect of the present invention, a user terminal includes a receiving section that receives a synchronization signal block transmitted in part of frequency bands in a specific frequency band and a control section that, after random access procedures based on the synchronization signal block, controls transmission and/or receipt in a plurality of frequency bands in the specific frequency band based on a plurality of specific signals transmitted respectively in the plurality of frequency bands.
    Type: Application
    Filed: May 2, 2017
    Publication date: March 19, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata, Hiroki Harada
  • Publication number: 20200092910
    Abstract: The present invention is designed to perform repetition transmissions of UL grant-free transmission properly. According to one aspect of the present invention, a user terminal includes a transmission section that performs UL grant-free transmission, in which UL data is transmitted without a UL transmission command from a radio base station, and a control section that controls repetition transmissions of the UL grant-free transmission, and the control section controls selection of time resources for performing the UL grant-free transmission based on the number configured for the repetition transmissions and whether the UL grant-free transmission is possible or not.
    Type: Application
    Filed: June 8, 2017
    Publication date: March 19, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20200084763
    Abstract: A terminal is disclosed that includes a processor that, if the terminal receives downlink control information for scheduling the UL transmission in a secondary CC to which sensing of channel is applied, determines one of a Power Headroom (PH) based on actual transmission or a PH not based on actual transmission irrespective of a result of the sensing. In addition, the terminal includes a transmitter that reports the determined PH.
    Type: Application
    Filed: November 12, 2019
    Publication date: March 12, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Kazuki Takeda, Kazuaki Takeda, Tooru Uchino, Satoshi Nagata
  • Publication number: 20200076487
    Abstract: Provided are a beam configuration method, a mobile station and a base station. The beam configuration method performed by a base station according to embodiments of the present invention includes: determining a beam transmission scheme for a mobile station according to performance of the mobile station; and transmitting information to the mobile station according to the beam transmission scheme.
    Type: Application
    Filed: March 7, 2018
    Publication date: March 5, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Min LIU, Liu LIU, Huiling JIANG, Xin WANG, Qin MU, Chongning NA, Jing WANG, Yuichi KAKISHIMA, Kazuaki TAKEDA, Satoshi NAGATA
  • Publication number: 20200067651
    Abstract: The present invention is designed to control the transport block (TB)-based and/or code block group (CBG)-based transmission (including retransmission) and/or receipt properly. According to one aspect of the present invention, a user terminal has a receiving section that, when a code block group (CBG) comprised of one or more code blocks (CBs) is retransmitted, receives downlink control information (DCI) that is used to schedule the CBG, and a control section that controls receipt of the CBG based on the DCI, and the control section controls the decoding of the CBG based on the cause of the retransmission of the CBG.
    Type: Application
    Filed: May 2, 2017
    Publication date: February 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20200067675
    Abstract: To properly perform communication also in the case of using numerology different from that of the existing LTE system, a user terminal has a receiving section that receives a downlink control channel, and a control section that controls detection of a plurality of downlink control channel candidates, where a reference signal used in reception of the downlink control channel and/or an allocation resource block (RB) of downlink control channel candidates is configured to be common between at least two downlink control channel candidates among the plurality of downlink control channel candidates.
    Type: Application
    Filed: October 31, 2017
    Publication date: February 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki TAKEDA, Kazuaki TAKEDA, Satoshi NAGATA, Qin MU, Lihui WANG
  • Publication number: 20200068513
    Abstract: A base station for communicating with a user device includes: a setting unit configured to set, to a block including a synchronization signal and system information, information indicating a transmission period of a block set including the one or more blocks, and a communication unit configured to transmit the block set to the user device in the transmission period, and to perform an initial access process with the user device based on the system information included in the block.
    Type: Application
    Filed: May 2, 2017
    Publication date: February 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20200068598
    Abstract: According to one aspect of the present invention, a user terminal has a transmission section that performs UL grant-free transmission, in which UL data is transmitted without a UL transmission indication from the radio base station; and a control section that controls the UL grant-free transmission based on a configuration of the UL grant-free transmission, which is determined based on physical layer signaling. According to one aspect of the present invention, even when UL grant-free transmission is performed, the decline in communication throughput and the like can be reduced.
    Type: Application
    Filed: May 2, 2017
    Publication date: February 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou