Patents by Inventor Kazuki Takeda

Kazuki 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: 20190320344
    Abstract: A user terminal (20) is provided with: an error detection unit (205) that detects the presence/absence of an error concerning a downlink data signal and generates ACK or NACK which are error detection results; and a mapping unit (207) that maps a transmission signal on a first frequency resource in one symbol and corresponding to ACK when the error detection result is ACK, and maps a transmission signal on a second frequency resource different from the first frequency resource in the same symbol corresponding to NACK when the error detection result is NACK.
    Type: Application
    Filed: August 2, 2017
    Publication date: October 17, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190313398
    Abstract: The present invention is designed so that control information for a receiving apparatus can be reported properly in the UL/DL of future radio communication systems. A transmitting apparatus, according to the present invention, has a control section that controls generation of a reference signal using an amount of phase rotation and/or a base sequence that are associated with control information for a receiving apparatus, and a transmission section that transmits the reference signal.
    Type: Application
    Filed: November 1, 2017
    Publication date: October 10, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190306888
    Abstract: To perform a random access procedure appropriately in communication using beamforming. A user terminal for communicating with a radio base station using a plurality of beams includes: a transmission section that transmits a random access preamble; a reception section that receives a random access response corresponding to the random access preamble; and a control section that controls transmission of the random access preamble and/or reception of the random access response using given resources associated with a plurality of beam patterns.
    Type: Application
    Filed: July 14, 2017
    Publication date: October 3, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata, Hiroki Harada
  • Patent number: 10433296
    Abstract: A user terminal carries out radio communication with a plurality of cells by employing carrier aggregation, and has a receiver that, when a connection is established with a TDD cell, receives information about a given DL/UL configuration that is selected from a plurality of DL/UL configurations, and a processor that controls transmission and reception to and from the TDD cell, and a DL/UL configuration to carry out DL communication in all subframes is included as one in the plurality of DL/UL configurations, and the processor uses the DL/UL configuration to carry out DL communication in all subframes as one of the DL/UL configurations only when the connecting TDD cell is a secondary cell. If so, the processor feeds back an A/N in response to each DL subframe of the secondary cell by using a given UL subframe of a primary cell.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: October 1, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Kazuaki Takeda, Hideaki Takahashi, Hiromasa Umeda, Satoshi Nagata
  • Patent number: 10432365
    Abstract: The present invention is designed reduce the increase of load in user terminals even when the number of CCs that can be configured in a user terminal is expanded from that of existing systems and/or when CA is executed using unlicensed CCs.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: October 1, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Kazuki Takeda, Kazuaki Takeda, Tooru Uchino, Satoshi Nagata
  • Patent number: 10425925
    Abstract: The present invention is designed so that UL transmission can be made adequately even when transmission of uplink control information using secondary cells (SCells) is made configurable. A user terminal communicates with a radio base station by using carrier aggregation, and has a generating section that generates uplink control information based on a DL signal transmitted from the radio base station, and a control section that controls transmission of the uplink control information, and the control section controls the transmission of the uplink control information by applying simultaneous transmission of an uplink control channel and an uplink shared channel to each of a plurality of cell groups, each including at least one component carrier (CC).
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: September 24, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Tooru Uchino, Satoshi Nagata
  • Patent number: 10425924
    Abstract: The present invention is designed so as to carry out the listening operation that accompanies UL transmission and/or UL transmission adequately when UL transmission is controlled based on the result of listening. The present invention provides a transmission section that transmits an uplink shared channel, an uplink control channel and an uplink reference signal, and a control section that controls the transmission of the uplink shared channel, the uplink control channel and/or the uplink reference signal based on the result of listening in the uplink, and, when the uplink reference signal is configured to be transmitted in a subframe in which the uplink shared channel and/or the uplink control channel are transmitted, the control section controls the transmission of the uplink reference signal based on the result of listening that is executed before the uplink shared channel and/or the uplink control channel are transmitted.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: September 24, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Hiroki Harada, Shimpei Yasukawa, Satoshi Nagata
  • Publication number: 20190289580
    Abstract: A wireless communication terminal capable of increasing the utilization efficiency of ACK/NACK resources and suppressing unnecessary PUSCH band reduction while avoiding ACK/NACK collision. The wireless communication terminal has a configuration provided with: a reception unit for receiving a control signal including ARI via an E-PDCCH set from among one or a plurality of E-PDCCH sets; a control unit for determining an offset value indicated by the ARI on the basis of whether or not a resource region that may be taken by a dynamic ACK/NACK resource corresponding to the E-PDCCH set that has received the control signal and a resource region that may be taken by a dynamic ACK/NACK resource corresponding to another E-PDCCH set overlap, and imparting an offset to the ACK/NACK resource according to the value of the ARI; and a transmission unit for transmitting the ACK/NACK signal using the determined ACK/NACK resource.
    Type: Application
    Filed: June 4, 2019
    Publication date: September 19, 2019
    Inventors: Kazuki Takeda, Hidetoshi Suzuki, Ayako Horiuchi, Toru Oizumi
  • Publication number: 20190289641
    Abstract: A mobile station is disclosed including a processor that, in Carrier Aggregation using component carriers that are under the control of a master radio base station and a secondary radio base station, when a plurality of random access procedures are started, and when simultaneous transmission of random access preambles occurs in the plurality of random access procedures, performs a ramping control on a transmission power of a random access preamble in a random access procedure that is assigned priority and does not perform the ramping control on a transmission power of a random access preamble in the random access procedure other than the random access procedure that is assigned priority, a receiver that receives signals from the master radio base station and the secondary radio base station, and a transmitter that transmits signals to the master radio base station and the secondary radio base station.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Kazuki Takeda, Hideaki Takahashi
  • Patent number: 10414653
    Abstract: The present invention addresses the problem of providing agglomeraterd boron nitride particles which are suitable to be used as a thermally conductive filler for a heat dissipation sheet of a power semiconductor device, and which exhibit excellent isotropy of thermal conductivity, excellent degradation resistance, and excellent kneadability with respect to resin. The agglomerated boron nitride particles are obtained by agglomerating boron nitride primary particles. The agglomerated BN articles are characterized in that: a peak area intensity ratio ((100)/(004)) of a (100) plane to a (004) plane of the BN primary particles is 0.25 or more, and the average crystallite size of the BN primary particles obtained from a (002) plane peak of the BN primary particles is 375 ? or more.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: September 17, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Katsura Ikemiya, Masanori Yamazaki, Takuya Suzuki, Kazuki Takeda, Toshiyuki Sawamura, Sawa Hiramatsu, Tatsushi Isojima
  • Publication number: 20190281539
    Abstract: To perform communication using proper CSS also in future radio communication systems, a user terminal according to one aspect of the present invention is characterized by having a control section that determines a resource of a given common search space based on information on a resource amount of the common search space, and a receiving section that monitors a downlink control channel in at least a part of the resource of the given common search space.
    Type: Application
    Filed: September 29, 2017
    Publication date: September 12, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20190280837
    Abstract: Disclosed is a reference signal transmission scheme in which interference between adjacent cells is considered in a communication scheme in which uplink communication and downlink communication are dynamically switched. A feature of the present invention relates to a user equipment including a transmitting and receiving unit that performs transmission and reception of a radio signal with a base station in accordance with a communication scheme in which uplink communication and downlink communication are dynamically switched and a signal processing unit that processes the radio signal, wherein the transmitting and receiving unit transmits an uplink reference signal generated by the signal processing unit in fixed uplink radio resources in the communication scheme.
    Type: Application
    Filed: October 30, 2017
    Publication date: September 12, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190281602
    Abstract: In one aspect, a user equipment is disclosed including a control unit configured to precode an uplink reference signal based on a downlink reference signal, and a transmission unit configured to transmit the precoded uplink reference signal. In another aspect, a transmission method is disclosed including precoding an uplink reference signal based on a downlink reference signal, and transmitting the precoded uplink reference signal.
    Type: Application
    Filed: May 6, 2019
    Publication date: September 12, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Kazuki Takeda, Satoshi Nagata, Xin Wang, Chongning Na, Xiaolin Hou, Huiling Jiang
  • Patent number: 10411848
    Abstract: Disclosed is a base station apparatus in which a configuration section (102) configures, within a data assignable region for a terminal apparatus (200), a first search space and a second search space each being a candidate to which control information is assigned, each of the first search space and the second search space including a plurality of control channel elements, and a signal assignment section (105) assigns control information to each of the first search space and the second search space. In addition, the configuration section (102) allocates numbers to a plurality of first control channel elements included in the first search space in an ascending order, and allocates numbers larger than or identical with the numbers allocated to the first control channel elements to a plurality of second control channel elements included in the second search space.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: September 10, 2019
    Assignee: Sun Patent Trust
    Inventors: Ayako Horiuchi, Kazuki Takeda
  • Publication number: 20190273587
    Abstract: To suitably perform communication using a new control unit, even in the case of using the new control unit comprised of the number of subcarriers different from that of the existing resource block, a user terminal according to one aspect of the present invention is characterized by having a receiving section that receives information on a first resource unit comprised of subcarriers lower in number than a predetermined number, and a control section which identifies a frequency region of a second resource unit comprised of the same number of subcarriers as the predetermined number based on the information, and controls communication using the first resource unit inside the frequency region.
    Type: Application
    Filed: October 25, 2017
    Publication date: September 5, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Kazuaki Takeda, Satoshi Nagata, Katsutoshi Kusume
  • Patent number: 10405304
    Abstract: When downlink data allocation is indicated in an ePDCCH, this terminal device can determine PUCCH resources to be used in notification of response signals indicating results of error detection of downlink data without imposing scheduling restrictions on future DL subframes. In this device, an extraction unit receives downlink data on multiple unit bands. A CRC unit detects errors in the downlink data. A response signal generation unit generates a response signal by using the results of error detection of the downlink data obtained by the CRC unit. The control unit arranges the response signal in the PUCCH resources corresponding to the current DL subframe.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: September 3, 2019
    Assignee: Sun Patent Trust
    Inventors: Toru Oizumi, Ayako Horiuchi, Kazuki Takeda, Akihiko Nishio
  • Publication number: 20190268107
    Abstract: A communication apparatus in a radio communication system, including: a reception unit configured to receive control information including puncture information which indicates that there is a puncture resource in resources allocated to the communication apparatus from another communication apparatus; and a decoding unit configured to decode data received from the other communication apparatus in the allocated resources, wherein the decoding unit performs the decoding using the puncture information included in the control information received by the reception unit.
    Type: Application
    Filed: November 13, 2017
    Publication date: August 29, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Yousuke Sano, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190268861
    Abstract: The present invention is designed so that proper power headroom reports (PHRs) can be transmitted as feedback even when shortened processing time and/or shortened transmission time intervals (TTIs) are used. According to one aspect of the present invention, a user terminal has a transmission section that transmits an uplink signal in a shortened transmission time interval (sTTI) in a given carrier, and a control section that controls generation and transmission of a power headroom report (PHR) based on a power headroom (PH) of one or more sTTIs.
    Type: Application
    Filed: September 13, 2017
    Publication date: August 29, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang
  • Publication number: 20190268898
    Abstract: To suppress decreases in spectral usage efficiency, even in the case of not using a reference signal in demodulation of uplink control information, a user terminal according to one aspect of the present invention is characterized by having a control section that determines whether or not to use a predetermined resource in transmission based on uplink control information to notify, and a transmitting section that transmits a signal in the predetermined resource when it is determined that the predetermined resource is used in transmission, where the predetermined resource is one of a first resource that is not allocated to another user terminal and a second resource that is allocated also to another user terminal.
    Type: Application
    Filed: November 1, 2017
    Publication date: August 29, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20190268096
    Abstract: The present invention is designed so that data can be decoded suitably even when multiple transmission time interval lengths are used in one carrier. According to one aspect of the present invention, a user terminal has a receiving section that receives a DL signal in a second transmission time interval (TTI) having a longer TTI length than a first TTI, and a control section that saves soft bits of the received DL signal, and controls a decoding process using the saved soft bits and a retransmitted DL signal, and, when a DL signal that is transmitted in the first TTI is scheduled in a resource allocated to the DL signal transmitted in the second TTI, the control section controls the decoding process without using a soft bit corresponding to the DL signal that is transmitted in the first TTI.
    Type: Application
    Filed: September 14, 2017
    Publication date: August 29, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Shinpei Yasukawa, Satoshi Nagata, Lihui Wang