Patents by Inventor Daiki TAKEDA

Daiki 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: 20210120506
    Abstract: A user terminal is disclosed including a reception section that receives a Synchronization Signal (SS) block including a synchronization signal and a broadcast channel and a control section that specifies SS block identification information based on at least a sequence of a first reference signal and a sequence of a second reference signal. The sequence of the first reference signal being a sequence to be allocated to a first symbol, and being generated based on cell identification information for identifying a cell and a first part of the SS block identification information for identifying the SS block. The sequence of the second reference signal being a sequence to be allocated to a second symbol, being generated based on the cell identification information for identifying the cell and a second part of the SS block identification information, and being different from the sequence of the first reference signal.
    Type: Application
    Filed: July 28, 2017
    Publication date: April 22, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Patent number: 10972167
    Abstract: A user apparatus communicating with a base station in a radio communication system including the base station and the user apparatus includes a first receiving unit to receive multiple first reference signals transmitted from the base station; a detection unit to detect a specific antenna port via which the plurality of first reference signals is received, or a specific directivity pattern, among a plurality of directivity patterns generated by a plurality of antenna ports, in which the plurality of first reference signals are received; a measuring unit to measure reception power of each of the first reference signals; and a transmission unit to group the reception power of each of the first reference signals into one of groups of the specific antenna port and the specific directivity pattern via which the first reference signals are received to transmit the groups of the reception power to the base station.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: April 6, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yoshihisa Kishiyama, Daiki Takeda
  • Publication number: 20210068064
    Abstract: To prevent occurrence of delay and/or increase in power consumption at the time of access to a network in future radio communication systems, one aspect of a user terminal according to the present disclosure includes: a receiving section that receives a synchronization signal block including a broadcast channel in a certain sync raster; and a control section that controls, based on certain bit information of a certain information element included in the synchronization signal block, a sync raster to be detected by variably interpreting bit information included in at least one of the certain information element and another information element.
    Type: Application
    Filed: January 11, 2018
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Daiki Takeda, Satoshi Nagata
  • Patent number: 10925019
    Abstract: Even when different numerologies from those of legacy LTE systems are used, synchronization signals are appropriately transmitted and/or received. A user terminal includes: a reception section that receives a first synchronization signal and a second synchronization signal mapped on predetermined resources; and a control section that controls synchronization processing based on the first synchronization signal and the second synchronization signal, and spacings of the first synchronization signal and the second synchronization signal at which the first synchronization signal and the second synchronization signal are mapped on subcarriers are different.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: February 16, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20200366398
    Abstract: A terminal is disclosed including a receiver that receives a synchronization signal/physical broadcast channel (SS/PBCH) block including a synchronization signal (SS) and a physical broadcast channel (PBCH); and a processor that determines a control resource set based on configuration information in a configuration information set of a plurality of configuration information sets, the configuration information set being associated with information based on the SS/PBCH block, the configuration information being associated with a value of a field in the PBCH, and the configuration information including a plurality of parameters regarding the control resource set. In other aspects, a radio communication method and a base station are also disclosed.
    Type: Application
    Filed: November 16, 2017
    Publication date: November 19, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Kazuki Takeda, Hiroki Harada, Yousuke Sano
  • Publication number: 20200314776
    Abstract: A terminal is disclosed including a receiver that detects a synchronization signal (SS)/physical broadcast channel (PBCH) block including an SS and a PBCH; and a processor that determines a resource for monitoring a downlink control channel based on a field in the PBCH, and at least one of a first subcarrier spacing of the SS/PBCH block, a second subcarrier spacing of the resource, a frequency band, and an index of the SS/PBCH block. In other aspects, a radio communication method for a terminal and a base station are also disclosed.
    Type: Application
    Filed: October 6, 2017
    Publication date: October 1, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Daiki Takeda, Daisuke Murayama, Satoshi Nagata
  • Publication number: 20200260299
    Abstract: A terminal is disclosed including a processor that controls reception of a first synchronization signal (PSS), a second synchronization signal (SSS), and a broadcast channel (PBCH) in a predetermined block that is formed by a predetermined number of symbols and a predetermined number of subcarriers; and a receiver that receives the PSS, the SSS and the PBCH that form the predetermined block, wherein the PSS and the SSS are located in a first frequency domain, wherein the PBCH is located in at least part of a second frequency domain that is broader than the first frequency domain, and wherein the PBCH is located in at least part of a first predetermined domain neighboring the SSS in the frequency direction in the predetermined block and the PBCH is not located in a second predetermined domain neighboring the PSS in the frequency direction in the predetermined block.
    Type: Application
    Filed: October 2, 2018
    Publication date: August 13, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Yousuke Sano, Daiki Takeda
  • Patent number: 10721676
    Abstract: The present invention is designed to reduce communication overhead in communication in which beamforming is used. A user terminal according to one aspect of the present invention has a transmission section that transmits a beam identification signal for identifying a given beam, a receiving section that receives given information transmitted in the given beam based on the beam identification signal, and a control section that controls transmission of the beam identification signal.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: July 21, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Keisuke Saito, Daiki Takeda, Satoshi Nagata
  • Publication number: 20200221404
    Abstract: A terminal is disclosed including a receiver configured to receive a synchronization signal block (SS/PBCH block) including information that indicates a configuration of a control resource set; and a processor configured to determine a position of the control resource set relative to the SS/PBCH block based on the information. In other aspects, another terminal, a radio communication method for a terminal, and a base station are also disclosed.
    Type: Application
    Filed: September 18, 2018
    Publication date: July 9, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Satoshi Nagata, Daisuke Murayama, Hiroki Harada
  • Publication number: 20200145939
    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: Application
    Filed: April 28, 2017
    Publication date: May 7, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Kazuaki Takeda, Daiki Takeda, Satoshi Nagata
  • Publication number: 20200128498
    Abstract: SS block identification information is identified with high reliability and/or low complexity. According to one aspect of the present invention, a user terminal has a receiving section that receives a synchronization signal (SS) block, which includes a synchronization signal and a broadcast channel; and a control section that specifies identification information of the SS block, based on at least one of a difference of demodulation reference signal sequences for the broadcast channel, a difference of mapping pattern of the reference signal sequences, and a difference of frequency position to which the reference signal sequences are mapped, among a plurality of symbols in the SS block.
    Type: Application
    Filed: June 15, 2017
    Publication date: April 23, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Daiki Takeda, Satoshi Nagata
  • Publication number: 20200119966
    Abstract: A base station apparatus communicates with a plurality of user apparatuses and includes a transmitting unit that transmits a plurality of radio signals to the plurality of user apparatuses, and a control unit that arranges a periodic block including a synchronization signal and system information in one or more radio signals of the plurality of radio signals based on a subcarrier spacing of the radio signal.
    Type: Application
    Filed: June 16, 2017
    Publication date: April 16, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20200119965
    Abstract: In order to transmit and receive signals properly in a radio communication system in which communication is performed based on different formats than in existing LTE systems, a user terminal, according to one aspect of the present invention, has a receiving section that receives a synchronization signal block, which contains a plurality of synchronization signals and a plurality of broadcast channels that are allocated in different time fields, and a control section that selects time information of the synchronization signal block based on the broadcast channels and/or demodulation reference signals allocated in the same time fields with the broadcast channels, and the synchronization signal block contains broadcast channels that are allocated in three or more time fields, including at least contiguous time fields, respectively.
    Type: Application
    Filed: June 2, 2017
    Publication date: April 16, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Daiki Takeda, Satoshi Nagata
  • 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
  • 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: 20200059810
    Abstract: A terminal is disclosed including a receiver that receives a synchronization signal block including a synchronization signal and a broadcast channel, and a processor that, if specified information is notified to the terminal, derives, based on a timing of a serving cell, a synchronization signal block index for another cell. In other aspects, a radio communication method for a terminal is also disclosed.
    Type: Application
    Filed: May 2, 2017
    Publication date: February 20, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Daiki Takeda, Satoshi Nagata, Jing Wang
  • Publication number: 20200059873
    Abstract: Even when different numerologies from those of legacy LTE systems are used, synchronization signals are appropriately transmitted and/or received. A user terminal includes: a reception section that receives a first synchronization signal and a second synchronization signal mapped on predetermined resources; and a control section that controls synchronization processing based on the first synchronization signal and the second synchronization signal, and spacings of the first synchronization signal and the second synchronization signal at which the first synchronization signal and the second synchronization signal are mapped on subcarriers are different.
    Type: Application
    Filed: November 1, 2017
    Publication date: February 20, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20200036420
    Abstract: A user apparatus communicating with a base station in a radio communication system including the base station and the user apparatus includes a first receiving unit to receive multiple first reference signals transmitted from the base station; a detection unit to detect a specific antenna port via which the plurality of first reference signals is received, or a specific directivity pattern, among a plurality of directivity patterns generated by a plurality of antenna ports, in which the plurality of first reference signals are received; a measuring unit to measure reception power of each of the first reference signals; and a transmission unit to group the reception power of each of the first reference signals into one of groups of the specific antenna port and the specific directivity pattern via which the first reference signals are received to transmit the groups of the reception power to the base station.
    Type: Application
    Filed: August 30, 2019
    Publication date: January 30, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Yoshihisa Kishiyama, Daiki Takeda
  • Publication number: 20190349108
    Abstract: In one aspect of the present invention, a base station includes an index generation unit configured to generate an index indicating a time-domain location of a synchronization signal block where a synchronization signal or a physical broadcast channel is placed; and a transmission unit configured to transmit a portion of the index using one or more synchronization signal of a primary synchronization signal, a secondary synchronization signal, and a tertiary synchronization signal and transmit a remaining portion of the index using the physical broadcast channel.
    Type: Application
    Filed: January 22, 2018
    Publication date: November 14, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Daiki Takeda, Hiroki Harada, Satoshi Nagata
  • Publication number: 20190246453
    Abstract: Disclosed is a scheme of transmitting various types of radio signals for which interference between adjacent cells is considered in a radio communication system (for example, dynamic TDD) in which uplink communication and downlink communication can be dynamically switched. A feature of the present invention relates to user equipment including a transceiver 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 processor that processes the radio signal, wherein the transceiver transmits a connection request signal generated by the signal processor in fixed uplink radio resources of the communication scheme.
    Type: Application
    Filed: October 31, 2017
    Publication date: August 8, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Kazuki Takeda, Kazuaki Takeda, Daiki Takeda, Daisuke Murayama, Satoshi Nagata