Patents by Inventor Kazuaki Takeda

Kazuaki 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).

  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200304274
    Abstract: A user terminal according to one aspect of the present disclosure includes: a transmission section that transmits an uplink control channel over multiple slots; and a control section that, when changing an active Bandwidth Part (BWP) during the transmission of the uplink control channel, controls the transmission of the uplink control channel after the BWP changing. According to the one aspect of the present disclosure, it is possible to prevent a communication throughput from lowering even when a BWP is switched.
    Type: Application
    Filed: November 24, 2017
    Publication date: September 24, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • TERMINAL, RADIO COMMUNICATION METHOD, AND BASE STATION
    Publication number: 20200304270
    Abstract: A terminal is disclosed that includes a transmitter that performs uplink (UL) transmission without a UL grant using a resource configured by higher layer signaling, a receiver that receives retransmission command information, which indicates a retransmission command for the UL transmission, and a processor that controls a resource used for retransmission of the UL transmission by units of symbols based on the retransmission command information. In other aspects, a base station and a radio communication method for a terminal are disclosed.
    Type: Application
    Filed: June 8, 2020
    Publication date: September 24, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • USER TERMINAL, RADIO BASE STATION AND RADIO COMMUNICATION METHOD
    Publication number: 20200305123
    Abstract: The present invention is designed to make it possible to acquire broadcast information in a suitable manner. According to one aspect of the present invention, a user terminal has a receiving section that receives a synchronization signal and a broadcast signal, and a control section that specifies a frequency hopping pattern that is applied to the broadcast signal based on the synchronization signal.
    Type: Application
    Filed: March 27, 2017
    Publication date: September 24, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Yousuke Sano, Kazuki Takeda, Satoshi Nagata
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200295913
    Abstract: A user terminal is disclosed including a transmitting/receiving section that performs transmission and reception by Time Division Duplex (TDD) by using a DL/UL frequency band pair that has a UL frequency band and a DL frequency band configured in a frequency direction in a carrier; and a control section that performs control to switch between a first DL/UL frequency band pair and a second DL/UL frequency band pair, and performs the transmission and the reception. In another aspect, a radio communication method of a user terminal is also disclosed.
    Type: Application
    Filed: November 16, 2017
    Publication date: September 17, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • RADIO TRANSMISSION DEVICE AND RADIO RECEPTION DEVICE
    Publication number: 20200295979
    Abstract: A terminal is disclosed including a processor configured to map a phase tracking reference signal, PTRS, to at least one symbol used for an uplink shared channel starting from a leading symbol of the uplink shared channel; and a transmitter configured to perform transmission processing for the uplink shared channel and the PTRS. In other aspects, another terminal and a base station are also disclosed.
    Type: Application
    Filed: September 29, 2017
    Publication date: September 17, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima
  • USER EQUIPMENT AND TRANSMISSION AND RECEPTION POINT
    Publication number: 20200287677
    Abstract: A user equipment (UE) is disclosed including a receiver that receives at least a reference signal (RS) transmitted using a first beam from a transmission and reception point (TRP), using at least a second beam, and a processor that determines the first beam paired with the second beam based on reception quality of the RSs. The UE further includes a transmitter that transmits feedback information indicating the determined first beam. The second beam is an omni-directional beam. The receiver receives, from the TRP, reception (Rx) beam designation information indicating an Rx beam to receive the RSs, and the second beam is the Rx beam.
    Type: Application
    Filed: March 22, 2018
    Publication date: September 10, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Chongning Na, Satoshi Nagata, Kazuaki Takeda
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200288501
    Abstract: The present invention is designed to properly transmit a scheduling request, a random access preamble, and a sounding reference signal when single-UL communication is applied to a non-stand-alone radio communication system. A user terminal controls the transmission of at least one of the scheduling request, the random access preamble and the sounding reference signal in the first RAT based at least on UL/DL configurations.
    Type: Application
    Filed: September 11, 2017
    Publication date: September 10, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • User equipment, base station, and measurement method
    Patent number: 10772000
    Abstract: There is provided user equipment of a radio communication system including a base station and the user equipment, the user equipment including a receiver that receives, from the base station, measurement band information indicating a frequency range in which received quality is measured in a system bandwidth; and a measurer that measures the received quality in the frequency range indicated by the measurement band information.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: September 8, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kazuaki Takeda, Yuta Sagae, Satoshi Nagata
  • Method for transmitting hybrid automatic repeat request feedback information, and user equipment
    Patent number: 10771197
    Abstract: Disclosed are a method for transmitting Hybrid Automatic Repeat Request (HARQ) feedback information, a user equipment, and a base station. The method includes: determining a reception window of data on which HARQ binding is to be performed; detecting data in the reception window; and bundling and transmitting HARQ feedback information for the data detected in the reception window. By means of the method, the user equipment and the base station, HARD bundling can be very conveniently implemented in a Half-Duplex (HD) frequency division multiplexing system.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: September 8, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Qin Mu, Liu Liu, Huiling Jiang, Naoto Okubo, Kazuaki Takeda
  • TERMINAL, RADIO COMMUNICATION METHOD, AND RADIO BASE STATION
    Publication number: 20200275442
    Abstract: A terminal is disclosed that includes a receiving section that receives downlink control information (DCI) and a control section that assumes that scheduling of 1 ms Transmission Time Interval (TTI) length in a first CC is performed based on DCI that is received in 1 ms TTI length of a second CC that is different from the first CC and is not performed based on DCI that is received in TTI length shorter than 1 ms of a third CC that is different from the first CC. In other aspects, a radio communication method for a terminal and a radio base station are disclosed.
    Type: Application
    Filed: May 11, 2020
    Publication date: August 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Tooru Uchino, Kazuaki Takeda, Satoshi Nagata, Hiroki Harada
  • BASE STATION APPARATUS AND USER APPARATUS
    Publication number: 20200267722
    Abstract: A base station apparatus performs communication with a user apparatus and includes a setting unit that arranges a reference signal used for phase correction in a radio frame at a predetermined interval and a transmitting unit that transmits the radio frame to the user apparatus, and, in a case in which the reference signal used for the phase correction is punctured in the radio frame, the reference signal used for the phase correction is arranged in a resource of the radio frame in which the reference signal used for the phase correction is arrangeable.
    Type: Application
    Filed: September 25, 2017
    Publication date: August 20, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200259609
    Abstract: User terminal (20) receives a downlink resource including a data signal, a demodulation RS, and a correction RS via receiver (202), performs channel estimation using the demodulation RS via channel estimator (206) and channel corrector (207), and demodulates the data signal using a result of the channel estimation via demodulator and decoder (208). An MCS (CQI) index value and demodulation RS ports are associated with each CW of the data signal, and the correction RS is associated with any of demodulation RS ports associated with a high-quality CW corresponding to a highest MCS (CQI) index value. Channel estimator (206) and channel corrector (207) calculate a phase fluctuation amount using the correction RS associated with the demodulation RS port for the high-quality CW.
    Type: Application
    Filed: August 10, 2017
    Publication date: August 13, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200259576
    Abstract: A terminal is disclosed including a receiver that receives a demodulation reference signal; and a processor that controls reception of the demodulation reference signal based on a parameter related to mapping of the demodulation reference signal, wherein when the parameter is configured to a specific value, a specific multiplexing method for the demodulation reference signal is supported. In other aspects, another terminal is also disclosed.
    Type: Application
    Filed: September 14, 2017
    Publication date: August 13, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200252180
    Abstract: To enable activation/deactivation of one or more frequency bands (for example, BWPs) configured in a carrier to be appropriately controlled. A user terminal of the present invention includes a receiving section that monitors a control resource region in a downlink (DL) frequency band in a carrier, to receive downlink control information (DCI), and a control section that controls transmission of a uplink (UL) signal in an UL frequency band in the carrier, based on the DCI. The control section controls activation or deactivation of the UL frequency band.
    Type: Application
    Filed: August 10, 2017
    Publication date: August 6, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200244413
    Abstract: The present invention is designed to enable quick beam recovery. A user terminal according to the present invention has a receiving section that receives a downlink (DL) signal, and a control section that controls a beam that is used to transmit and/or receive the DL signal, and the control section controls transmission of an uplink (UL) signal that requests switching of the beam, based on the received power and/or the received quality of a plurality of mobility measurement signals that are respectively associated with a plurality of beams.
    Type: Application
    Filed: February 2, 2018
    Publication date: July 30, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Satoshi Nagata, Chongning Na, Yuichi Kakishima
  • USER TERMINAL
    Publication number: 20200245347
    Abstract: A new configuration suitable for a downlink single carrier is provided in a downlink control signal of a radio communication system of the future. A user terminal includes: a reception section that receives a downlink signal including a downlink control signal and a downlink data signal; and a demodulation and decoding section that uses the downlink control signal to demodulate and decode the downlink data signal, in which the downlink control signal is mapped to signal transmission points of a single carrier in units of control channel elements.
    Type: Application
    Filed: November 30, 2017
    Publication date: July 30, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideyuki Moroga, Kazuaki Takeda, Satoshi Nagata
  • TRANSMITTING APPARATUS, RECEIVING APPARATUS AND RADIO COMMUNICATION METHOD
    Publication number: 20200235894
    Abstract: A terminal is disclosed including a receiver that receives downlink control information indicating a transmission bandwidth allocated to a downlink shared channel within a bandwidth part, and a processor that determines a size of a precoding resource block group (PRG), to which a same precoding is applied, based on the transmission bandwidth or a subset of the transmission bandwidth. In other aspects, a radio communication method for a terminal is also disclosed.
    Type: Application
    Filed: July 13, 2017
    Publication date: July 23, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20200236697
    Abstract: The present invention is designed so as to allow efficient use of radio resources between DL control channels and DL data channels. According to the present invention, a user terminal has a receiving section that monitors a plurality of candidate resources in a downlink (DL) control channel, and receives downlink control information (DCI) mapped to at least one of the plurality of candidate resources, and a control section that controls receipt of the DL data channel based on the DCI, wherein the control section selects the plurality of candidate resources based on a higher layer parameter.
    Type: Application
    Filed: September 21, 2017
    Publication date: July 23, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Kazuaki Takeda, Satoshi Nagata, Lihui Wang, Qin Mu
  • Radio communication method, local area base station apparatus, mobile terminal apparatus and radio communication system
    Patent number: 10721692
    Abstract: A radio communication method is provided in which a local area base station apparatus, arranged in a wide area where a first carrier frequency is used and forming a local area that is narrower than the wide area, transmits a downlink signal, using a second carrier frequency, which belongs to a different frequency band from the first carrier frequency and which has a wider bandwidth than the first carrier frequency, the local area base station apparatus transmits a detection signal that is used to detect the local area base station apparatus in the mobile terminal apparatus, and the local area base station apparatus transmits the downlink signal for the mobile terminal apparatus with transmission power that is determined based on the path loss of the detection signal received in the mobile terminal apparatus.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: July 21, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Yoshihisa Kishiyama, Anass Benjebbour, Kazuaki Takeda
  • BASE STATION APPARATUS AND USER EQUIPMENT
    Publication number: 20200228384
    Abstract: A terminal includes a processor that arranges a demodulation reference signal (DMRS) in a first resource, and arranges a phase tracking reference signal (PTRS) in an interval of a number of symbols in a second resource with a symbol of the DMRS as a starting point, and a transmitter that transmits, to a base station apparatus, the DMRS and the PTRS that are arranged in the first resource and the second resource, respectively.
    Type: Application
    Filed: September 25, 2017
    Publication date: July 16, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima