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 EQUIPMENT AND BASE STATION APPARATUS
    Publication number: 20210314097
    Abstract: A user equipment includes a receiving unit configured to receive a first signal of inter-terminal direct communication transmitted from a first user equipment, and information indicating a first resource for transmitting a HARQ (Hybrid Automatic Repeat Request) response corresponding to the first signal of inter-terminal direct communication transmitted from either one of a base station apparatus or the first user equipment; a control unit configured to determine the HARQ response based on a reception result of the first signal of inter-terminal direct communication; and a transmitting snit configured to transmit the determined HARQ response to the base station apparatus or the first user equipment, by using the first resource for transmitting the HARQ response.
    Type: Application
    Filed: July 17, 2018
    Publication date: October 7, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Ryosuke Osawa, Yuki Matsumura, Kazuaki Takeda, Huan Wang, Xiaolin Hou
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20210306101
    Abstract: A user terminal according to one aspect of the present disclosure includes a receiving section and a control section. The receiving section receives setting information used to apply a space-time block code (STBC) to an uplink symbol. The control section determines, in the case where the number of uplink symbols in a given period is odd, a symbol pair to which the STBC is applied over a plurality of symbols of the given period or within the time of a specific symbol of the given period. According to one aspect of the present disclosure, it is possible to achieve appropriate transmit diversity using STBC even in the case where the number of UL symbols in a given period is odd.
    Type: Application
    Filed: August 3, 2018
    Publication date: September 30, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Masaya Okamura, Kazuaki Takeda, Hiroki Harada, Yuki Matsumura
  • USER TERMINAL AND RADIO COMMUNICATION METHOD
    Publication number: 20210307037
    Abstract: A user terminal according to one aspect of the present disclosure includes: a receiving section that receives information regarding the number of symbols instructed to perform UL transmission in a slot and information regarding the number of UL symbols in the slot; and a control section that determines whether or not to perform repetition transmission in the slot based on of the number of symbols instructed to perform UL transmission and the number of UL symbols. According to one aspect of the present disclosure, it is possible to perform suitable repetition transmission in units shorter than a slot.
    Type: Application
    Filed: August 3, 2018
    Publication date: September 30, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Masaya Okamura, Kazuaki Takeda, Hiroki Harada, Yuki Matsumura
  • User apparatus and uplink control information bit width determination method
    Patent number: 11134480
    Abstract: A user apparatus that perform communication with a base station in a mobile communication system is disclosed. The user apparatus includes a transmitter that transmits capability information of the user apparatus to a base station, a receiver that receives configuration information from the base station, and a processor that determines a bit width of a rank indicator based on a maximum number of Multiple-Input Multiple-Output (MIMO) layers. Further, the configuration information received from the base station includes a parameter indicating a transmission mode and the maximum number of MIMO layers.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: September 28, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kazuaki Takeda
  • USER EQUIPMENT AND WIRELESS COMMUNICATION METHOD
    Publication number: 20210297211
    Abstract: A user equipment (UE) is disclosed including a receiver that receives multiple Channel State Information Reference Signals (CSI-RSs) transmitted from a base station (BS) using first resources; wherein each of the multiple CSI-RSs is associated with each of the first resources. The UE includes a processor that performs resource selection in which at least a second resource is selected from the first resources. The UE includes a transmitter that transmits, to the BS, a first indicator that indicates the second resource. When the processor determines that the first resources are out-of-range in the resource selection, the first indicator indicates that the first resources are out-of-range.
    Type: Application
    Filed: February 2, 2018
    Publication date: September 23, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Chongning Na, Kazuaki Takeda, Satoshi Nagata
  • Terminal and base station apparatus for arranging and receiving a phase tracking reference signal
    Patent number: 11128514
    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: Grant
    Filed: September 25, 2017
    Date of Patent: September 21, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Yuichi Kakishima
  • User terminal and radio communication method
    Patent number: 11129200
    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: Grant
    Filed: July 14, 2017
    Date of Patent: September 21, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata, Hiroki Harada
  • User terminal, a feedback method at the user terminal, a base station and a method at the base station
    Patent number: 11128396
    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: Grant
    Filed: January 5, 2018
    Date of Patent: September 21, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Xin Wang, Xiaolin Hou, Chongning Na, Huiling Jiang, Yuichi Kakishima, Kazuaki Takeda, Satoshi Nagata
  • USER EQUIPMENT AND SIGNAL TRANSMISSION METHOD
    Publication number: 20210289524
    Abstract: A user equipment in a wireless communication system that supports a first uplink communication scheme in which a user equipment selects a predetermined uplink radio resource autonomously and a second uplink communication scheme in which a base station allocates an uplink radio resource to the user equipment includes: an acquisition unit that acquires instruction information that indicates any one of the first uplink communication scheme and the second uplink communication scheme from the base station; and a transmission unit that transmits an uplink signal using the first uplink communication scheme or the second uplink communication scheme according to the instruction information.
    Type: Application
    Filed: July 21, 2017
    Publication date: September 16, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Kazuaki Takeda, Satoshi Nagata
  • Terminals receiving downlink control signals and downlink data signals
    Patent number: 11122600
    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: Grant
    Filed: November 30, 2017
    Date of Patent: September 14, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideyuki Moroga, Kazuaki Takeda, Satoshi Nagata
  • User device for detecting radio link failure in enhanced coverage mode
    Patent number: 11122507
    Abstract: An object is to provide a user device and a radio communication method that are capable of appropriately detecting radio link failure (RLF) even when an enhanced coverage mode is in operation. UE (200) includes CE level setting unit (230) that sets, when the UE is set in the enhanced coverage mode, a reception quality threshold (Qin/Qout) of a reference reception power level (RSRP/RSRQ) specified for CE level, and a radio link monitoring unit (240) that executes radio link monitoring based on the set reception quality threshold. The CE level setting unit (230) sets, regardless of whether the UE (200) is set to any CE level or not, a reception quality threshold specified for the maximum CE level.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: September 14, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Wuri Andarmawanti Hapsari, Kazuaki Takeda
  • User equipment and method of SRS transmission
    Patent number: 11121837
    Abstract: A user equipment (UE) is disclosed including a receiver that receives Sounding Reference Symbol (SRS) configuration information that indicates a first resource used for transmission of a predetermined reference signal from a base station (BS). The UE includes a transmitter that transmits an SRS using a second resource that is the first resource. The UE further includes a processor that determines a precoder applied to the SRS based on the predetermined reference signal. The transmitter transmits the SRS precoded using the determined precoder. The predetermined reference signal is a Channel State Information Reference Signal (CSI-RS), an SRS, or a Synchronization Signal Block (SSB)/Physical Broadcast Channel (PBCH).
    Type: Grant
    Filed: February 2, 2018
    Date of Patent: September 14, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Ryosuke Osawa, Kazuaki Takeda, Satoshi Nagata
  • User terminal and radio communication method
    Patent number: 11115945
    Abstract: To transmit and receive signals in a radio communication system where communication is carried out based on different configurations from those of existing LTE systems, in accordance with one aspect of the present invention, a user terminal has a receiving section that receives a synchronization signal arranged in a first frequency domain and a broadcast channel arranged in a second frequency domain, which is wider than the first frequency domain, and a control section that controls a receiving process of DL signals, and the control section controls the receiving process on the assumption that, in at least part of given frequency domain that neighbors the first frequency domain, no DL signal is mapped or a specific DL signal is mapped.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: September 7, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Kazuaki Takeda, Daiki Takeda, Satoshi Nagata
  • User terminal and radio communication method
    Patent number: 11108611
    Abstract: In user terminal 20, reception section 204 receives one or more downlink signals mapped to a plurality of signal transmission points in a single carrier, and extraction section 214 extracts at least one of the one or more downlink signals that is assigned to at least one of the signal transmission points that belongs to a resource block group associated with user terminal 20, in which the resource block group is in units of a predetermined number of signal transmission points and the at least one of the one or more downlink signals is extracted based on a definition of the resource block group. This processing makes it possible to multiplex downlink signals for a plurality of terminals in a single-carrier transmission.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: August 31, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideyuki Moroga, Kazuaki Takeda, Satoshi Nagata
  • User terminal and radio communication method
    Patent number: 11102808
    Abstract: The present invention is designed to provide a user terminal and a radio communication method, whereby the period to apply contention-based UL data transmission can be configured adequately. A user terminal according to the present invention has a transmission section that transmits UL data to a radio base station, and a control section that controls application of contention-based UL data transmission in which UL data is transmitted without a UL grant from the radio base station, and the control section controls whether or not to apply the contention-based UL data transmission based on a running state of a timing advance (TA) timer.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: August 24, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Kazuaki Takeda, Hiroki Harada, Satoshi Nagata
  • USER EQUIPMENT
    Publication number: 20210258887
    Abstract: A user equipment for performing inter-terminal direct communication with one or a plurality of user equipments, includes a receiving unit configured to receive a synchronization signal or a reference signal transmitted from the plurality of user equipments; a control unit configured to control transmission power of the inter-terminal direct communication, based on the received synchronization signal or the received reference signal transmitted from the plurality of user equipments; and a transmitting unit configured to perform transmission of the inter-terminal direct communication by applying the controlled transmission power, to at least one of the plurality of user equipments.
    Type: Application
    Filed: July 3, 2018
    Publication date: August 19, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Ryosuke Osawa, Yuichi Kakishima, Kazuaki Takeda
  • Terminal, radio communication method, and radio base station
    Patent number: 11096168
    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: Grant
    Filed: May 11, 2020
    Date of Patent: August 17, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Tooru Uchino, Kazuaki Takeda, Satoshi Nagata, Hiroki Harada
  • User terminal, radio base station and radio communication method
    Patent number: 11089574
    Abstract: The present invention is designed to optimize the uplink access procedure even when the band to use is limited to partial narrow bands in a system band. A user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives system information that includes indication information of an uplink carrier frequency, from a radio base station, as system information for narrow bands, which is different from system information for the system band, and a transmission section that transmits a random access preamble to the radio base station in one of a plurality of narrow bands that are specified by the indication information of the uplink carrier frequency.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: August 10, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Shimpei Yasukawa, Hideyuki Moroga, Satoshi Nagata
  • TERMINAL, BASE STATION, SYSTEM, AND FEEDBACK METHOD
    Publication number: 20210243841
    Abstract: A terminal is disclosed that includes a receiver that receives sidelink control information and data in sidelink and a transmitter that transmits a feedback signal corresponding to the data on a sidelink feedback channel. The transmitter determines a resource for transmitting the feedback signal based on a correspondence between a resource of the data and a resource for feedback. In other aspects, a base station, systems, and feedback methods are also disclosed.
    Type: Application
    Filed: April 22, 2021
    Publication date: August 5, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shimpei Yasukawa, Kazuaki Takeda, Hiroki Harada, Satoshi Nagata, Qun Zhao
  • RADIO BASE STATION AND USER TERMINAL
    Publication number: 20210243788
    Abstract: A radio base station according to the present application includes a transmission section that transmits downlink control information, and a control section that controls scheduling of data, based on a relationship between an interfered apparatus and a destination apparatus. The interfered apparatus is an apparatus that is interfered with by transmission of the data scheduled in accordance with the downlink control information, and the destination apparatus is a destination of data from an interfering apparatus that interferes with a transmission apparatus of the scheduled data.
    Type: Application
    Filed: May 10, 2018
    Publication date: August 5, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Daisuke Murayama, Hiroki Harada, Kazuaki Takeda, Satoshi Nagata