Patents by Inventor Yuta Sagae

Yuta Sagae 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).

  • Patent number: 11936441
    Abstract: A FrontHaul Multiplexer (FHM) for relaying communications between a signal processing device and a plurality of radio devices includes a storage unit that stores a table in which device identification information of each of the plurality of radio devices is associated with beam identification information assigned to the radio device; a scheduling information reception unit that receives, from the signal processing device, scheduling information of a user terminal performing radio communications with the plurality of radio devices; a determination unit that acquires from the table the device identification information associated with the beam identification information of uplink included in the scheduling information and then determines from the acquired device identification information the radio device in charge of the user terminal; and a transmission unit that transmits to the signal processing device an uplink signal transmitted from the determined radio device.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: March 19, 2024
    Assignee: NTT DOCOMO, INC.
    Inventors: Takashi Kosugi, Tatsuro Yajima, Takuto Arai, Yuta Sagae, Akihito Hanaki, Hidekazu Shimodaira, Masahiro Fujii, Yoshiaki Ofuji
  • Publication number: 20220014236
    Abstract: An FHM for relaying communications between a signal processing device and a plurality of radio devices comprises: a storage unit that stores a table in which device identification information of each of the plurality of radio devices is associated with beam identification information assigned to the radio device; a scheduling information reception unit that receives, from the signal processing device, scheduling information of a user terminal performing radio communications with the plurality of radio devices; a determination unit that acquires from the table the device identification information associated with the beam identification information of uplink included in the scheduling information and then determines from the acquired device identification information the radio device in charge of the user terminal; and a transmission unit that transmits to the signal processing device an uplink signal transmitted from the determined radio device.
    Type: Application
    Filed: November 9, 2018
    Publication date: January 13, 2022
    Applicant: NTT DOCOMO, INC.
    Inventors: Takashi Kosugi, Tatsuro Yajima, Takuto Arai, Yuta Sagae, Akihito Hanaki, Hidekazu Shimodaira, Masahiro Fujii, Yoshiaki Ofuji
  • Patent number: 11219067
    Abstract: An objective is to enable communications properly using an Scell even in a case where a radio base station which transmits “Activate command” and a radio base station which manages an Scell are different when “Inter-site CA” is performed. A radio base station eNB #1 according to the invention includes a transmission unit 12 configured to transmit an “Activate command” which is a command to activate a cell #B to a mobile station UE and thereafter notify a radio base station eNB #10 that the cell #B is activated.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: January 4, 2022
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Yuta Sagae, Kazuaki Takeda
  • Patent number: 11102668
    Abstract: Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE (200) transmits to a radio access network the Measurement Report. The UE (200) judges numberOfTriggeringCell that triggers transmission of the measurement report to the radio access network, and transmits the Measurement Report when the number of neighbor cells that fulfill the entering condition is equal to or more than the numberOfTriggeringCell.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: August 24, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kohei Kiyoshima, Wuri Andarmawanti Hapsari, Yuta Sagae, Sadayuki Abeta
  • Patent number: 10911172
    Abstract: A user apparatus, in a radio communication system including a plurality of base stations, including a reception unit configured to receive, from a connecting base station, control information to be used for reducing an interference signal sent from an interference base station for the user apparatus; and an interference reducing unit configured to reduce the interference signal by using the control information to obtain a desired signal sent from the connecting base station.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: February 2, 2021
    Assignee: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Yusuke Ohwatari, Satoshi Nagata, Yuta Sagae, Yukihiko Okumura
  • Patent number: 10779263
    Abstract: Techniques for assigning uplink dedicated resources in inter-site or inter-eNB carrier aggregation promptly are disclosed. One aspect of the present invention relates to a base station including a transmission and reception unit configured to use radio resources to communicate with a user equipment and a resource management unit configured to manage the radio resources, wherein the resource management unit comprises a pooling information storage unit configured to store pooling information indicative of radio resources reserved for the base station by a non-anchor base station in inter-eNB carrier aggregation, and the resource management unit autonomously assigns the radio resources indicated in the pooling information to the user equipment.
    Type: Grant
    Filed: January 20, 2014
    Date of Patent: September 15, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Wuri Andarmawanti Hapsari, Yuta Sagae
  • 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
  • Patent number: 10555272
    Abstract: A mobile station UE according to the present invention includes: a managing unit 11 configured to manage one or multiple TAGs each including any of a Pcell and an Scell; an adjusting unit 12 configured to adjust the transmission timings of uplink signals in any of the Pcell and the Scell belonging to the same TAG such that the transmission timings will be the same; and a transmitting unit 13 configured to notify a radio base station eNB of the supportable number of TAGs.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: February 4, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Yuta Sagae
  • Publication number: 20200015107
    Abstract: Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE (200) transmits to a radio access network the Measurement Report. The UE (200) judges numberOfTriggeringCell that triggers transmission of the measurement report to the radio access network, and transmits the Measurement Report when the number of neighbor cells that fulfill the entering condition is equal to or more than the numberOfTriggeringCell.
    Type: Application
    Filed: January 31, 2018
    Publication date: January 9, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kohei Kiyoshima, Wuri Andarmawanti Hapsari, Yuta Sagae, Sadayuki Abeta
  • Patent number: 10531340
    Abstract: Some techniques for promptly assigning uplink dedicated resources in inter-site or inter-eNB carrier aggregation are disclosed. One aspect of the present invention relates to a user equipment including a transmission and reception unit configured to use radio resources to communicate with multiple base stations, a resource management unit configured to manage the radio resources and a cell type determination unit configured to determine a type of a cell providing the radio resources, wherein when the resource management unit detects occurrence of a release trigger for assigned uplink dedicated resources, the cell type determination unit determines a type of a cell providing the uplink dedicated resources and retains or releases the uplink dedicated resources depending on the determined cell type.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: January 7, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Wuri Andarmawanti Hapsari, Yuta Sagae
  • Patent number: 10425180
    Abstract: A user apparatus in a radio communication system including a plurality of base stations, including a reception unit that receives, from a connecting base station, control information to be used for reducing a signal of a control channel, that causes interference, sent from an interference base station for the user apparatus, and an interference reducing unit that reduces the signal of the control channel that causes the interference by using the control information to obtain a desired signal sent from the connecting base station.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: September 24, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Yousuke Sano, Yusuke Ohwatari, Satoshi Nagata, Yuta Sagae, Kazuaki Takeda
  • Publication number: 20190150020
    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: Application
    Filed: March 31, 2017
    Publication date: May 16, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kazuaki Takeda, Yuta Sagae, Satoshi Nagata
  • Publication number: 20190098641
    Abstract: A user equipment including a processor that measures a Signal to Interference and Noise Ratio (SINR) based on a reference signal and a transmitter that reports the measured SINR to a base station in accordance with a predefined reporting trigger. The processor further measures one or both of a Reference Signal Received Quality (RSRQ) and a Reference Signal Received Power (RSRP), and the transmitter reports one or both of the measured RSRQ and RSRP together with the measured SINR to the base station in accordance with the predefined reporting trigger.
    Type: Application
    Filed: November 26, 2018
    Publication date: March 28, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kengo Yagyu, Yuta Sagae
  • Patent number: 10237832
    Abstract: One aspect of the present invention relates to a mobile station having a SAR backoff function including a SAR signaling receiving unit configured to receive a SAR signaling from a base station, the SAR signaling indicating that a SAR backoff is available, and a maximum transmit power determination unit configured to determine maximum transmit power of the mobile station depending on whether the SAR signaling receiving unit has received the SAR signaling, wherein in response to receiving the SAR signaling at the SAR signaling receiving unit, the maximum transmit power determination unit applies a power reduction factor associated with the SAR backoff to determine the maximum transmit power.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: March 19, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuta Sagae, Daisuke Nishikawa, Hiroyuki Ishii
  • Patent number: 10172144
    Abstract: A user apparatus in a mobile communication system supporting carrier aggregation includes a measurement unit configured to measure an rs-sinr (reference signal-signal to interference and noise ratio) for a reference signal in a physical downlink control channel transmitted from a base station; and a reporting unit configured to report the measured rs-sinr to the base station in accordance with a predefined reporting trigger.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: January 1, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Kengo Yagyu, Yuta Sagae
  • Patent number: 9986536
    Abstract: To execute appropriate process when “Time-Switched UL CA” is executed and even when transmission of uplink information using a plurality of CCs has been scheduled in a same TTI. A radio base station eNB according to the present invention includes a UL transmission processing unit 11 configured to transmit uplink information at TTI#n+4 using a CC allocated over a PDCCH to the mobile station UE at TTI#n. The UL transmission processing unit 11 is configured to transmit the uplink information at each of TTIs using only one CC, and when a plurality of CCs is allocated at TTI#n, the UL transmission processing unit 11 is configured to select uplink information to be transmitted at TTI#n+4, based on a priority corresponding to the uplink information to be transmitted using each of the plurality of CCs allocated.
    Type: Grant
    Filed: July 5, 2013
    Date of Patent: May 29, 2018
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Yuta Sagae, Kohei Kiyoshima, Kazuaki Takeda
  • Patent number: 9936471
    Abstract: Appropriate CC-to-TAG mapping is configured when “UL CA” is performed. A mobile station UE of the invention includes: a management unit 11 configured to manage one or more TAGS; an adjustment unit 12 configured to make adjustment to synchronize transmission timings of uplink signals within CCs which belong to the same TAG; and a transmission unit 13 configured to notify a radio base station eNB of a combination of supported bands, supported CCs, and settable TAGS, and the bands and the CCs grouped in the TAGs included in the combination.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: April 3, 2018
    Assignee: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Hideaki Takahashi, Yuta Sagae
  • Patent number: 9913262
    Abstract: The present invention is designed to provide a radio communication system, a user terminal and a radio communication method that make it possible to monitor communication quality adequately even when a new radio resource structure is employed.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: March 6, 2018
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Tooru Uchino, Yuta Sagae, Hideaki Takahashi
  • Patent number: 9788191
    Abstract: “Inter-site CA” using CCs under different radio base stations eNB in an asynchronous state can be performed appropriately. A mobile station UE of the present invention comprises a transmission unit 12 configured to transmit “UE Capability Information” to a radio base station eNB, the “UE Capability Information” indicating whether the mobile station UE is capable of performing “Inter-site CA” using CCs under different radio base stations eNB in the asynchronous state.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: October 10, 2017
    Assignee: NTT DOCOMO, INC
    Inventors: Tooru Uchino, Yuta Sagae
  • Patent number: 9781705
    Abstract: In order to control feedback control information in uplink transmission appropriately even when using carrier aggregation in HetNet, the present invention provides a user terminal that is able to communicate with a plurality of radio base stations having overlapping coverage areas by using carrier aggregation, the user terminal comprising: a reception section that receives downlink shared channel signals using component carriers of a primary cell and a secondary cell; a generating section that generates transmission acknowledgement signals in response to the downlink shared channel signals; and an allocating section that allocates the transmission acknowledgement signals to predetermined uplink control channel resources, wherein the allocating section allocates the transmission acknowledgement signals to either or both of uplink control channel resources of the primary cell and uplink control channel resources of the secondary cell in accordance with contents of the transmission acknowledgement signals and/or
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: October 3, 2017
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Yoshihisa Kishiyama, Kohei Kiyoshima, Tooru Uchino, Yuta Sagae, Hideaki Takahashi