Patents by Inventor Shin Nakamatsu

Shin Nakamatsu 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: 9551774
    Abstract: A method to be executed by a user terminal for searching for locations of one or more wireless devices that are located within an area in which the one or more wireless devices can wirelessly communicate with the user terminal, wherein each of the one or more wireless devices periodically transmits a beacon signal. The method includes detecting a number of the one or more wireless devices that are located within the area based on the beacon signals; determining a transmission period for transmitting the beacon signals depending on the number of the one or more wireless devices; and instructing the one or more wireless devices that are located within the area to transmit the beacon signals in accordance with the determined transmission period.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: January 24, 2017
    Assignee: NTT DOCOMO, INC.
    Inventors: Masanori Ishida, Shigeru Sekiguchi, Kouki Hayashi, Shin Nakamatsu, Ryuutarou Hosoi
  • Publication number: 20150355308
    Abstract: A method to be executed by a user terminal for searching for locations of one or more wireless devices that are located within an area in which the one or more wireless devices can wirelessly communicate with the user terminal, wherein each of the one or more wireless devices periodically transmits a beacon signal. The method includes detecting a number of the one or more wireless devices that are located within the area based on the beacon signals; determining a transmission period for transmitting the beacon signals depending on the number of the one or more wireless devices; and instructing the one or more wireless devices that are located within the area to transmit the beacon signals in accordance with the determined transmission period.
    Type: Application
    Filed: April 8, 2014
    Publication date: December 10, 2015
    Applicant: NTT DOCOMO, INC.
    Inventors: Masanori ISHIDA, Shigeru SEKIGUCHI, Kouki HAYASHI, Shin NAKAMATSU, Ryuutarou HOSOI
  • Patent number: 7957730
    Abstract: A weighting parameter estimation system for estimating a weight parameter for the antenna elements of a mobile terminal is provided. The system includes a prohibited space forming part to which electromagnetic waves should not be directed when the mobile terminal transmits a signal in wireless communications, and a weighting parameter determination unit configured to determine the weighting parameter for each of the antenna elements of the mobile terminal such that the power level of a test wave transmitted from or received in the prohibited space becomes the minimum.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: June 7, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Ryo Yamaguchi, Shin Nakamatsu, Shinji Uebayashi
  • Publication number: 20100294052
    Abstract: A hand phantom for evaluating a mobile apparatus disclosed wherein the hand phantom includes a thumb part, an index finger part, a middle finger part, a ring finger part and a pinky finger part, and in an XY coordinate system where for the mobile apparatus being held, an orientation of a thumb along a width direction of the mobile apparatus is defined as a +X direction, an orientation of a bottom edge of the mobile apparatus along a longitudinal axis of a body of the mobile apparatus is defined as a +Y direction, and a center of a pointing device array of the mobile apparatus is defined as a coordinate origin, the thumb part is arranged within a range of ±6.2 mm in the X direction and ±12.1 mm in the Y direction around a coordinate (X, Y)=(?1 mm, 7 mm) in the XY coordinate system.
    Type: Application
    Filed: August 5, 2008
    Publication date: November 25, 2010
    Applicant: NTT DOCOMO, INC.
    Inventors: Daisuke Kurita, Yukihiko Okumura, Fumio Kira, Shin Nakamatsu
  • Publication number: 20100171650
    Abstract: There is provided a multi-antenna measurement method of measuring a device under test having at least two receive antennas and capable of considering the spatial correlation between antennas in a simpler configuration. Two different uncorrelated signal sequences “a” and “b” are generated by the pseudo base transceiver station 4. These signal sequences “a” and “b” are transmitted as radio waves from positions (positions of transmitting antenna elements 31 and 32) of the two base angles of the isosceles triangle toward the device under test 1 provided at a position of the apex angle respectively to measure the received antennas by receive antennas of the device under test 1. This method is easy to calibrate and can consider the spatial correlation between antennas in a simpler configuration.
    Type: Application
    Filed: October 13, 2009
    Publication date: July 8, 2010
    Applicant: NTT DoCoMo, Inc.
    Inventors: Yoshiki OKANO, Daisuke KURITA, Shin NAKAMATSU, Takashi OKADA
  • Publication number: 20050101315
    Abstract: A weighting parameter estimation system for estimating a weight parameter for the antenna elements of a mobile terminal is provided. The system includes a prohibited space forming part to which electromagnetic waves should not be directed when the mobile terminal transmits a signal in wireless communications, and a weighting parameter determination unit configured to determine the weighting parameter for each of the antenna elements of the mobile terminal such that the power level of a test wave transmitted from or received in the prohibited space becomes the minimum.
    Type: Application
    Filed: November 9, 2004
    Publication date: May 12, 2005
    Applicant: NTT DoCoMo, Inc.
    Inventors: Ryo Yamaguchi, Shin Nakamatsu, Shinji Uebayashi