Patents by Inventor Satoshi Nagata

Satoshi Nagata 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: 20210084663
    Abstract: A terminal is disclosed that includes a receiver that receives a specified signal including a synchronization signal and a broadcast channel and a controller that controls a reception of a demodulation reference signal for a downlink shared channel while assuming that the demodulation reference signal does not collide with the specified signal. In other aspects, a radio communication method for a terminal is also disclosed.
    Type: Application
    Filed: July 13, 2017
    Publication date: March 18, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Keisuke Saito, Kazuaki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20210084647
    Abstract: An object of the present disclosure is to suppress an increase in a processing load of a UE even when an HARQ-ACK codebook is semi-statically configured. One aspect of a user terminal according to the present disclosure includes: a transmission section that transmits a transmission acknowledgement signal for downlink transmission received via a downlink shared channel (PDSCH); and a control section that controls an information amount of the transmission acknowledgement signal based on downlink shared channel reception capability in a given domain of the own user terminal, and a number of downlink shared channels that can be scheduled in the given domain.
    Type: Application
    Filed: February 15, 2018
    Publication date: March 18, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Shaozhen Guo, Xiaolin Hou
  • Patent number: 10952233
    Abstract: A user terminal is disclosed that communicates in a narrow band that is narrower than a minimum bandwidth for use supported in an existing LTE (Long Term Evolution) system. The user terminal includes a receiver that receives downlink control information and a controller that controls a scheduling unit of a downlink data signal and/or an uplink data signal based on command information included in the downlink control information. A radio base station is also disclosed that communicates in a narrow band that is narrower than a minimum bandwidth for use supported in an existing LTE (Long Term Evolution) system. The radio base station includes a transmitter that transmits downlink control information and a controller that controls scheduling of a downlink data signal and/or an uplink data signal, wherein the downlink control information includes command information that is used to control a scheduling unit of the downlink data signal and/or the uplink data signal.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: March 16, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Satoshi Nagata
  • Patent number: 10952195
    Abstract: Provided is a technique that transmits data, which is transmitted without obtaining transmission permission, with low delay and high reliability. An aspect of the invention relates to a transmitter including a resource determination unit that determines whether a first type of resource has been allocated in response to the generation of a transmission event for a predetermined type of information and a transmitting unit that transmits the predetermined type of information to a receiver, using the first type of resource, without obtaining transmission permission, when the first type of resource has been allocated.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: March 16, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Kazuaki Takeda, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20210075558
    Abstract: A user terminal is disclosed including a receiving section that monitors at least one of a first downlink control information format and a second downlink control information format in a plurality of search space sets configured for one or more cells to receive one or more pieces of downlink control information; and a control section that controls transmission of retransmission control information (HARQ-ACK) corresponding to the downlink control information, wherein at least one of a bit position of the HARQ-ACK and a downlink assignment index counter value (counter DAI value) is determined based on at least one of a cell index, a search space index, and a downlink control information format type. In another aspect, a radio communication method is also disclosed.
    Type: Application
    Filed: April 4, 2018
    Publication date: March 11, 2021
    Inventors: Kazuki TAKEDA, Satoshi NAGATA, Shaozhen GUO, Lihui WANG, Xiaolin HOU
  • Publication number: 20210075581
    Abstract: A user terminal according to one aspect of the present disclosure includes a receiving section that receives downlink control information indicating transmission and/or reception of data, and a control section that controls activation and/or deactivation of one or more bandwidth parts (BWPs), based on a field included in the downlink control information. According to one aspect of the present disclosure, it is possible to prevent deterioration in reception quality even when PUCCHs of a plurality of UEs commonly use the same resource block.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 11, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Kazuaki Takeda
  • Publication number: 20210076442
    Abstract: A terminal is disclosed including a processor that starts a timer based on a beam failure instance counter; a receiver that receives a reference signal for identifying a candidate beam; and a transmitter that, if the reference signal has layer 1 reference signal received power (L1-RSRP) exceeding a threshold value before the timer expires, and if there is at least one of contention-free random access (CFRA) resources corresponding to the reference signal, transmits a random access preamble using the at least one of CFRA resources. In other aspects, a radio communication method and a base station are also disclosed.
    Type: Application
    Filed: April 15, 2019
    Publication date: March 11, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata, Min Liu, Jing Wang, Xiaolin Hou
  • Publication number: 20210076361
    Abstract: Even when a plurality of numerologies are used, monitoring of a downlink control channel is appropriately controlled. A user terminal includes: a reception section that receives a downlink control channel; and a control section that controls monitoring of the downlink control channel by using a periodicity and an offset of a start timing associated with a subcarrier spacing.
    Type: Application
    Filed: January 17, 2018
    Publication date: March 11, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Shaozhen Guo, Lihui Wang, Xiaolin Hou
  • Patent number: 10945241
    Abstract: The invention aims to perform UL transmission in an appropriate manner even when using short transmission time intervals (TTIs). A user terminal includes a transmission section that performs the UL transmission using at least one of a plurality of TTIs contained in one subframe of existing systems, and a control section that controls allocation of an UL signal and/or an UL channel. The TTI is constituted of an even number of symbols of the existing system. The control section allocates an uplink control channel on the basis of the TTI.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: March 9, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Hiroki Harada, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20210068059
    Abstract: A user apparatus in a wireless communication system including a base station and a user apparatus, includes a signal reception part that receives, from the base station, a plurality of power control parameters that become candidates for power control parameters to be used by the user apparatus, a transmission power determination part that selects power control parameters to be used, from the plurality of power control parameters, and determines a transmission power of a UL signal, based on the selected power control parameters and a pathloss estimation value, and a signal transmission part that transmits the UL signal using the transmission power determined by the transmission power determination part.
    Type: Application
    Filed: September 8, 2017
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Satoshi Nagata, Ryosuke Osawa, Shaozhen Guo
  • Publication number: 20210068100
    Abstract: When a plurality of transmission methods of an uplink shared channel are supported, transmission of the uplink shared channel is appropriately configured. A user terminal includes: reception section that receives configuration information of a first uplink shared channel, a second uplink shared channel and a third uplink shared channel via a higher layer signaling, the first uplink shared channel being scheduled by the higher layer signaling, the second uplink shared channel being scheduled by the higher layer signaling and triggered by downlink control information, and the third uplink shared channel being scheduled by the downlink control information; and a control section that performs control on transmission of at least one uplink shared channel of the first uplink shared channel, the second uplink shared channel and the third uplink shared channel based on the configuration information, the control being different from that of transmission of other uplink shared channels.
    Type: Application
    Filed: January 19, 2018
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20210067274
    Abstract: To prevent deterioration in communication throughput and so on also in a case that multiplexing of uplink control information on an uplink data channel is supported, one aspect of a user terminal according to the present disclosure includes: a transmitting section that transmits an acknowledgement signal by multiplexing the acknowledgement signal on a first uplink shared channel used to perform transmission based on downlink control information for indicating UL transmission from a radio base station and/or a second uplink shared channel used to perform transmission regardless of downlink control information for indicating UL transmission; and a control section that determines a number of bits of the acknowledgement signal to be multiplexed on the first uplink shared channel and a number of bits of the acknowledgement signal to be multiplexed on the second uplink shared channel, based on different pieces of information.
    Type: Application
    Filed: December 27, 2017
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20210067194
    Abstract: A terminal is disclosed including a processor that determines an offset for a second frequency hop in a frequency hopping on an uplink shared channel based on an uplink Bandwidth Part (UL BWP) configuration; and a transmitter that transmits the uplink shared channel, wherein the UL BWP configuration includes information indicating a number of physical resource blocks (PRBs) in the UL BWP. In other aspects, a base station and a radio communication method for a terminal are also disclosed.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • Publication number: 20210067275
    Abstract: To prevent deterioration in communication throughput and so on also in a case that multiplexing of uplink control information on an uplink data channel is supported, one aspect of a base station according to the present disclosure includes a transmitting section that transmits downlink control information indicating UL transmission, and DL data, and a control section that controls scheduling such that the number of bits of a acknowledgement signal for the DL data, the acknowledgement signal being to be multiplexed on a first uplink shared channel that is transmitted based on the downlink control information and/or a second uplink shared channel that is transmitted independently of the downlink control information, is up to a given value.
    Type: Application
    Filed: December 27, 2017
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou
  • 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
  • Publication number: 20210067288
    Abstract: A user equipment (UE) is disclosed including a receiver that receives resource set information that indicates the number of selectable Channel State Information Reference Signal (CSI-RS) resources between a first CSI-RS group and a second CSI-RS group, CSI-RSs using first CSI-RS resources in the first CSI-RS group, and CSI-RSs using second CSI-RS resources in the second CSI-RS group. The UE includes a processor that selects at least a CSI-RS resource from the first CSI-RS resources and the second CSI-RS resources based on the resource set information. The UE includes a transmitter that performs CSI reporting that indicates the selected CSI-RS resource.
    Type: Application
    Filed: January 14, 2019
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuichi Kakishima, Chongning Na, Min Liu, Satoshi Nagata
  • Publication number: 20210068112
    Abstract: A terminal is disclosed including a receiver that receives a signal of a downlink shared channel; and a transmitter that transmits Acknowledgement (ACK)/Negative Acknowledgement (NACK) information for the signal of the downlink shared channel using an uplink control channel in a time resource included in a plurality of time resource candidates. In other aspects, a radio communication method and a base station are also disclosed.
    Type: Application
    Filed: August 29, 2017
    Publication date: March 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideyuki Moroga, Kazuaki Takeda, Satoshi Nagata
  • Patent number: 10938505
    Abstract: A user terminal includes a receiver that receives a downlink shared channel and a processor that obtains a transport block size (TBS) used for the downlink shared channel based on: a TBS index value that is associated with a modulation and coding scheme (MCS) index value used for the downlink shared channel; and a number of resource blocks (RBs) that are allocated to the downlink shared channel. When the downlink shared channel is transmitted by a predetermined transmission scheme and the MCS index value is a predetermined value, the processor modifies the TBS index value associated with the predetermined value and obtains the TBS based on the modified TBS index value and the number of RBs.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: March 2, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Satoshi Nagata, Kohei Kiyoshima, Hideaki Takahashi, Sadayuki Abeta
  • Publication number: 20210058129
    Abstract: To perform a beam failure recovery procedure by using an appropriate radio resource, a user terminal includes a transmitting section that transmits a beam failure recovery request, and a control section that controls transmission of the beam failure recovery request by using at least one of an uplink shared channel, an uplink control channel, a sounding reference signal, and a random access channel indicated by a downlink control channel.
    Type: Application
    Filed: December 27, 2017
    Publication date: February 25, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Chongning Na, Xiaolin Hou
  • Publication number: 20210058919
    Abstract: An aspect of a user terminal of the present invention includes a transmitting section that transmits a plurality of pieces of uplink control information (UCI) corresponding to a plurality of communications by using an uplink control channel or an uplink shared channel, and a control section that controls a transmission of at least a part of the plurality of pieces of UCI, based on a format of the uplink control channel or a maximum coding rate configured for the uplink shared channel when transmission timings of the plurality of pieces of UCI overlap each other.
    Type: Application
    Filed: December 27, 2017
    Publication date: February 25, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou