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: 20210136749
    Abstract: A terminal is disclosed including a processor that determines a single resource set among a plurality of resource sets configured based on higher layer signaling and that determines a transmission resource for an uplink control channel from the single resource set based on a field value in downlink control information; and a transmitter that transmits uplink control information by using the uplink control channel, wherein when a higher layer parameter corresponding to a maximum number of uplink control channel resources per resource set is applied to all the plurality of resource sets and when the maximum number exceeds a given value, the maximum number of uplink control channel resources per resource set other than a specific resource set is the given value. In another aspect, a radio communication method is also disclosed.
    Type: Application
    Filed: May 2, 2018
    Publication date: May 6, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Hideaki Takahashi, Satoshi Nagata
  • Publication number: 20210136532
    Abstract: A base station may transmit a broadcast/multicast service in a multicast broadcast single frequency network (MBSFN) area multicast communication. A method of wireless communication at a base station in accordance with an aspect of the present disclosure comprises determining a broadcast/multicast service to be provided to a user equipment (UE) in a multicast broadcast single frequency network (MBSFN) area, and transmitting a tracking reference signal (TRS) to the UE, the TRS indicating information associated with receiving the broadcast/multicast service by the UE.
    Type: Application
    Filed: October 29, 2020
    Publication date: May 6, 2021
    Inventors: Le LIU, Alberto RICO ALVARINO, Tao LUO, Xiaoxia ZHANG, Kazuki TAKEDA, Wanshi CHEN, Mostafa KHOSHNEVISAN, Ayan SENGUPTA
  • Publication number: 20210136729
    Abstract: User equipment in a radio communication system is provided. The user equipment includes a configuration information management unit configured to retain configuration information in relation to a plurality of divided resources that are capable of transmitting data without receiving data transmission permission from a communication device that is different from the user equipment, the plurality of divided resources each being associated with retransmission control processes, and a transmitter configured to select, from the plurality of divided resources, a divided resource that is associated with a given retransmission control process whose retransmission control buffer is empty, so as to transmit data by using the divided resource.
    Type: Application
    Filed: December 25, 2017
    Publication date: May 6, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Kazuki Takeda, Satoshi Nagata, Qun Zhao
  • Publication number: 20210136794
    Abstract: The present invention is designed so that, even when communication is made using a plurality of transmission time intervals (TTIs), scheduling requests are transmitted adequately. According to one aspect of the present invention, a user terminal has a transmitting/receiving section that transmits and/or receives using a plurality of transmission time intervals (TTIs) of different durations, and a control section that determines a resource to use to transmit a scheduling request (SR) based on at least one of a first TTI and a second TTI having a shorter TTI duration than the first TTI.
    Type: Application
    Filed: December 26, 2017
    Publication date: May 6, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Liu Liu, Huiling Jiang
  • Patent number: 10999025
    Abstract: The present invention is designed to reduce the degradation of communication quality even when future radio communication systems support UL control channels of different formats than existing systems. A transmission section that allocates uplink control information and an uplink reference signal to different frequency resources in an uplink control channel allocation field, and transmits the uplink control information and the uplink reference signal, and a control section that controls the allocation of the uplink control information and the uplink reference signal are provided, and the control section makes the frequency resources where the uplink reference signal is allocated hop between different time fields and/or between different resource blocks.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: May 4, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Patent number: 10999763
    Abstract: The present invention is designed so that, when a plurality of user terminals with different numerologies are multiplexed in the same carrier, the effect of latency reduction can be achieved effectively. According to the present invention, a user terminal has a receiving section that receives a downlink (DL) signal in a carrier in which a plurality of user terminals with different numerologies are multiplexed, a transmission section that transmits the retransmission control information of the DL signal, and a control section that configures a retransmission control subframe based on the same numerology among the plurality of user terminals, and controls transmission of the retransmission control information in the retransmission control subframes.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: May 4, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Patent number: 10999044
    Abstract: The present invention is designed so that communication can be carried out properly even when shortened TTIs are used. A user terminal communicates using a first transmission time interval (TTI) and a second TTI which has a shorter TTI duration than the first TTI, and this user terminal has a receiving section that receives first downlink control information which is transmitted from a radio base station per first TTI, and second downlink control information which is transmitted in the second TTI, and a control section that controls simultaneous reception of first downlink data which is based on the first downlink control information, and second downlink data which is based on the second downlink control information, in a same carrier, based on a given condition.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: May 4, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Liu Liu, Huiling Jiang
  • Publication number: 20210127359
    Abstract: Various aspects provide a method for radio resource allocation to support multicast services from a 5G-NR base station. In some aspects, the method may be performed by a processor of the base station. Various aspects include determining a multicast bandwidth part (BWP) within a carrier bandwidth, sending an indication of the multicast BWP to one or more user equipment (UE) computing devices in communication with the base station, and scheduling transmission of multicast data in the multicast BWP.
    Type: Application
    Filed: October 9, 2020
    Publication date: April 29, 2021
    Inventors: Kazuki TAKEDA, Le LIU, Prasad Reddy KADIRI, Ayan SENGUPTA, Alberto RICO ALVARINO, Xiaoxia ZHANG, Tao LUO, Mostafa KHOSHNEVISAN, Jing SUN, Xipeng ZHU, Wooseok NAM, Wanshi CHEN, Amer CATOVIC
  • Publication number: 20210126742
    Abstract: A user terminal includes: a transmitting section that transmits an uplink signal before connection establishment; and a control section that controls a repeated transmission of the uplink signal based on configuration information reported implicitly. According to an aspect of the present disclosure, repeated transmission before connection establishment is appropriately controlled.
    Type: Application
    Filed: April 15, 2019
    Publication date: April 29, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shohei Yoshioka, Yuki Matsumura, Kazuki Takeda, Satoshi Nagata
  • Publication number: 20210127424
    Abstract: A user equipment communicating with a base station in a wireless communication system including the base station and the user equipment, the user equipment including: a storage unit configured to store correspondence information where an identifier of a beam formed by the base station and configuration information used for transmission of a random access signal are associated with each other; a selection unit configured to select a specific beam on the basis of reception quality of signals transmitted from the base station by using a plurality of different beams and select configuration information corresponding to the specific beam on the basis of the correspondence information; and a transmission unit configured to transmit the random access signal to the base station by using the configuration information selected by the selection unit.
    Type: Application
    Filed: February 3, 2017
    Publication date: April 29, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shimpei Yasukawa, Kazuki Takeda, Kazuaki Takeda, Hiroki Harada, Satoshi Nagata
  • Patent number: 10993194
    Abstract: The present invention relates to reducing the decrease of uplink throughput in the event a user terminal connects with a plurality of radio base stations. In one aspect of the claimed invention, a user terminal includes a transmitter that performs transmission in a first cell group (CG) and a second CG, and a processor that, if the transmitter reports user terminal capability information indicating that the user terminal is capable of sharing transmission power dynamically and if transmission in the first CG overlaps in time with transmission in the second CG, scales transmission power of the second CG so that total transmission power of the transmission in the first CG and the transmission in the second CG does not exceed maximum allowable power.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: April 27, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Liu Liu, Lihui Wang, Huiling Jiang
  • Publication number: 20210120544
    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: Application
    Filed: December 8, 2020
    Publication date: April 22, 2021
    Inventors: Toru Oizumi, Ayako Horiuchi, Kazuki Takeda, Akihiko Nishio
  • Publication number: 20210120574
    Abstract: A terminal is disclosed including a receiver that receives a downlink control information and a downlink shared channel that is scheduled by the downlink control information. The terminal also includes a processor that determines an allocation of the downlink shared channel in a time domain based on a first timing indicated by a first time unit and a second timing indicated by a second time unit that are obtained from information notified by the downlink control information. In other aspects, a radio communication method is also disclosed.
    Type: Application
    Filed: March 17, 2017
    Publication date: April 22, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Qin Mu, Liu Liu, Chongning Na, Xin Wang, Jing Wang, Lihui Wang, Min Liu, Huiling Jiang
  • Publication number: 20210119756
    Abstract: To control UL transmission properly even when uplink data and demodulation reference signals are transmitted using short TTIs, a user terminal according to one aspect of the present invention has a transmission section that transmits a UL signal and a reference signal for use for demodulating the UL signal, and a control section that controls the allocation of the UL signal and the reference signal, and, when UL signals are allocated to a plurality of contiguous predetermined time intervals (sTTIs), respectively, the control section allocates the UL signal and the reference signal for use for demodulating the UL signal to the same sTTI, at least in an sTTI apart from the top sTTI.
    Type: Application
    Filed: March 23, 2017
    Publication date: April 22, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Lihui Wang, Xiaolin Hou, Huiling Jiang
  • Publication number: 20210120557
    Abstract: The present invention is designed to appropriately select PUCCH resources used to transmit HARQ-ACK. According to one aspect of the present invention, a user terminal has a control section that monitors candidate resources of one or more downlink (DL) control channels (DL) transmitted in multiple different time and/or frequency resources, and detects one or more downlink control information (DCI), and a transmission section that transmits delivery acknowledgment information in response to a downlink (DL) data channel by using an uplink (UL) control channel, and the control section selects resources for the UL control channel based on the DCI.
    Type: Application
    Filed: March 17, 2017
    Publication date: April 22, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuki Takeda, Satoshi Nagata, Qin Mu, Liu Liu, Chongning Na, Xin Wang, Jing Wang, Lihui Wang, Min Liu, Huiling Jiang
  • Publication number: 20210112500
    Abstract: Methods, systems, and devices for wireless communications are described. In one example, a user equipment (UE) may be configured to receive a control message scheduling a multicast transmission, and the UE may identify an open loop power control parameter for transmitting acknowledgment feedback responsive to the multicast transmission. The identification of the open loop power control parameter may be based on the transmission being multicast to a plurality of UEs, and in some cases a UE may identify an open loop power control parameter that is different than an open loop power control parameter associated with feedback responsive to unicast transmissions. In various examples, open loop power control parameters may correspond to respective feedback resources (e.g., according to a configuration for a set of open loop power control parameters), or to respective physical resource indicators (e.g., as signaled in downlink control information).
    Type: Application
    Filed: October 9, 2020
    Publication date: April 15, 2021
    Inventors: Kazuki Takeda, Le Liu, Alberto Rico Alvarino, Wanshi Chen
  • Publication number: 20210111835
    Abstract: The disclosure relates to methods, devices, and systems for wireless communications. In some wireless communications systems, a base station may transmit a multicast message to a group of user equipment (UEs), and the UEs may provide feedback for the multicast message. In some implementations, the base station may configure the UEs to transmit feedback for multicast messages. In some example, the UEs may transmit group-negative acknowledgment (NACK) feedback information for multicast messages that are not successfully received at the UEs. In some other examples, each UE may be configured with UE-specific uplink control channel resources for transmitting hybrid automatic repeat request (HARQ) feedback for a multicast message. In some implementations, a UE may support feedback for both unicast and multicast messages. The semi-static codebook for unicast, multicast, or both may account for whether the UE is capable of concurrently receiving unicast and multicast messages in a slot.
    Type: Application
    Filed: September 28, 2020
    Publication date: April 15, 2021
    Inventors: Mostafa Khoshnevisan, Xiaoxia Zhang, Jing Sun, Tao Luo, Le Liu, Kazuki Takeda, Alberto Rico Alvarino, Wanshi Chen, Xipeng Zhu, Peter Gaal
  • Publication number: 20210112547
    Abstract: Disclosed is a base station used as a first base station in a radio communication system having the first base station and a second base station. The base station includes a determination unit configured to determine a transmission direction configuration in a time segment having predetermined duration, and a configuration information transmission unit configured to periodically or aperiodically transmit information indicating the transmission direction configuration determined by the determination unit to the second base station.
    Type: Application
    Filed: May 2, 2017
    Publication date: April 15, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Shinpei Yasukawa, Satoshi Nagata, Kazuki Takeda, Shaozhen Guo, Lihui Wang, Xiaolin Hou
  • Publication number: 20210112535
    Abstract: The present disclosure aims at allowing a demodulation reference signal (DMRS) pattern suitable for a terminal to be selected from among a plurality of DMRS patterns including Legacy DMRS and Reduced DMRS. Disclosed is a terminal including: reception section 21 that receives uplink control information; control section 23 that determines a specific mapping pattern from among a plurality of mapping patterns for an uplink DMRS on the basis of the control information; and DMRS generating section 24 that generates a DMRS according to the specific mapping pattern.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Inventors: Lilei Wang, Kazuki Takeda, Ayako Horiuchi, Alexander Golitschek Edler von Elbwart, Masayuki Hoshino, Yoshihiko Ogawa
  • Publication number: 20210112499
    Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may be configured to receive a control message scheduling a multicast transmission, where the UE may identify a closed loop power control parameter for transmitting acknowledgment feedback responsive to the multicast transmission based on the multicast transmission transmitted to multiple UEs. The closed loop power control parameter may be indicated by a base station in a separate message than a downlink control information (DCI) scheduling the multicast transmission. For example, the base station may transmit the indication of the closed loop power control parameter in a group-transmit power control DCI or in a configuration for transmitting sounding reference signals. Additionally, the UE may adjust a transmit power for the acknowledgment feedback based on whether or not a DCI scheduling a retransmission is received in a time window after transmitting the acknowledgment feedback.
    Type: Application
    Filed: October 8, 2020
    Publication date: April 15, 2021
    Inventors: Kazuki Takeda, Le Liu, Alberto Rico Alvarino, Wanshi Chen