Patents by Inventor Keijiro Take

Keijiro Take 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: 10938461
    Abstract: A wireless control apparatus controls beamforming performed by a wireless base station apparatus that provides a communication service to a service area which includes a plurality of spots to be irradiated with a beam including a terminal search beam and a communication beam that are not used simultaneously for irradiation, and is irradiated with a plurality of the beams and is not simultaneously covered by the plurality of beams, and the apparatus includes: an arrival direction estimation unit that estimates an arrival direction of a wireless signal transmitted by a terminal communicating with a wireless base station; and a control unit that determines whether there is an active terminal in the spots on the basis of the arrival direction estimated by the arrival direction estimation unit, and, when it is determined that there is no active terminal, controls beamforming performed by the wireless base station apparatus to decrease a frequency of the terminal search beam with which one or more of the spots dete
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: March 2, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Daichi Uchino, Noriyuki Fukui, Masaaki Kusano, Kazuaki Ishioka, Keijiro Take
  • Patent number: 10897717
    Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station use a beam to communicate to and from each other. The method includes a step of grouping, by the base station, when the base station is to receive a random access channel signal transmitted as a connection request from the terminal, a plurality of beam directions by combining a main beam direction, which is determined as suitable for reception of the random access channel signal, with one or more beam directions adjacent to the main beam direction, and of receiving the random access channel signal with use of the grouped plurality of beam directions.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: January 19, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki Fukui, Kazuaki Ishioka, Keijiro Take
  • Publication number: 20200382186
    Abstract: A wireless control apparatus controls beamforming performed by a wireless base station apparatus that provides a communication service to a service area which includes a plurality of spots to be irradiated with a beam including a terminal search beam and a communication beam that are not used simultaneously for irradiation, and is irradiated with a plurality of the beams and is not simultaneously covered by the plurality of beams, and the apparatus includes: an arrival direction estimation unit that estimates an arrival direction of a wireless signal transmitted by a terminal communicating with a wireless base station; and a control unit that determines whether there is an active terminal in the spots on the basis of the arrival direction estimated by the arrival direction estimation unit, and, when it is determined that there is no active terminal, controls beamforming performed by the wireless base station apparatus to decrease a frequency of the terminal search beam with which one or more of the spots dete
    Type: Application
    Filed: October 28, 2016
    Publication date: December 3, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Daichi UCHINO, Noriyuki FUKUI, Masaaki KUSANO, Kazuaki ISHIOKA, Keijiro TAKE
  • Publication number: 20200367175
    Abstract: The present invention includes: a plurality of antenna sections, each of which to generate base station reception beams and to receive, by using the base station reception beams, one or more signals transmitted from a wireless terminal using one or more terminal transmission beams; a measurement unit that measures reception quality of each of the signals for each of the base station reception beams; and a control unit that groups the base station reception beams into groups in units of the antenna sections, and perform transmission power control on the terminal transmission beams of the wireless terminal in units of the groups, on the basis of a result of measurement of the measurement unit in units of the groups.
    Type: Application
    Filed: July 31, 2020
    Publication date: November 19, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki FUKUI, Keijiro TAKE
  • Publication number: 20200357270
    Abstract: An access point according to the present invention is an access point that receives first information measured by a sensor from a terminal and transmits the first information as sensor information to a server, the access point including: a measurement result estimator that estimates an estimation result that is information indicating an estimated value of the first information and is information to be used by the terminal to determine whether to transmit the first information; a communicator that transmits the estimation result to the terminal; and a wide area interface that transmits the estimation result as the sensor information to the server in a case where the first information is not received from the terminal for a certain period of time or longer after transmission of the estimation result to the terminal.
    Type: Application
    Filed: March 20, 2018
    Publication date: November 12, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masao OGA, Keijiro TAKE
  • Patent number: 10763937
    Abstract: A base station that communicates with a mobile station that intermittently performs a receiving operation during a cyclic reception period includes: an assignor that assigns a preamble to the mobile station; a start request signal generator that generates a start request signal containing the preamble assigned to the mobile station and requesting the start of a synchronization process between the mobile station and the base station; and a beam controller that transmits start request signals in a plurality of directions within the reception period while switching directions of directional beams for transmitting start request signals, and determines the direction of the directional beam for communicating with the mobile station, in accordance with the direction of the directional beam at the time of reception of the preamble transmitted from the mobile station having received the start request signal.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: September 1, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaaki Kusano, Noriyuki Fukui, Keijiro Take
  • Patent number: 10687255
    Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station are configured to use a beam to communicate to and from each other. The beam transmission/reception method includes a first step of setting, by the base station, when receiving a random access signal transmitted by the terminal as a connection request, a beam direction group at a time of reception of the random access signal by adding a further outer beam direction to beam directions used at a time of transmission of a notification signal for measuring a signal before the reception.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: June 16, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki Fukui, Keijiro Take, Atsushi Okamura
  • Publication number: 20200112347
    Abstract: A wireless terminal includes: an antenna that receives a plurality of beams formed by a radio base station; and a power control unit that adjusts transmission power of an uplink signal transmitted from the antenna to the radio base station after beam switching, on the basis of a reception power difference between a downlink signal of a beam used before the beam switching and a downlink signal of a beam to be used after beam switching, the beam switching being switching of a beam used for communication with the radio base station among the beams formed by the radio base station.
    Type: Application
    Filed: July 28, 2017
    Publication date: April 9, 2020
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki Fukui, Keijiro Take, Mitsuhiro Hashimoto
  • Publication number: 20190387445
    Abstract: A ground radio station of a radio communication system which includes a plurality of ground radio stations placed along a movement path of a mobile radio station and in which the mobile radio station switches the ground radio stations to connect to as the mobile radio station moves, the ground radio station including; a radio controller to reserve a radio resource for the mobile radio station in a case where, before the mobile radio station communicates with the ground radio station, the mobile radio station communicates with another ground radio station adjacent to the ground radio station; and a communication-status monitor to monitor a radio signal sent from the mobile radio station to the another ground radio station, wherein, when the communication-status monitor detects that the radio signal is not received for a predetermined time, the communication-status monitor checks communication status between the mobile radio station and the another ground radio station, and wherein, when the communication-statu
    Type: Application
    Filed: February 27, 2017
    Publication date: December 19, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tetsuya AOYAMA, Keijiro TAKE
  • Publication number: 20190334604
    Abstract: A base station that communicates with a mobile station that intermittently performs a receiving operation during a cyclic reception period includes: an assignor that assigns a preamble to the mobile station; a start request signal generator that generates a start request signal containing the preamble assigned to the mobile station and requesting the start of a synchronization process between the mobile station and the base station; and a beam controller that transmits start request signals in a plurality of directions within the reception period while switching directions of directional beams for transmitting start request signals, and determines the direction of the directional beam for communicating with the mobile station, in accordance with the direction of the directional beam at the time of reception of the preamble transmitted from the mobile station having received the start request signal.
    Type: Application
    Filed: January 23, 2017
    Publication date: October 31, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masaaki KUSANO, Noriyuki FUKUI, Keijiro TAKE
  • Publication number: 20190223058
    Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station are configured to use a beam to communicate to and from each other. The beam transmission/reception method includes a first step of setting, by the base station, when receiving a random access signal transmitted by the terminal as a connection request, a beam direction group at a time of reception of the random access signal by adding a further outer beam direction to beam directions used at a time of transmission of a notification signal for measuring a signal before the reception.
    Type: Application
    Filed: October 6, 2016
    Publication date: July 18, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki FUKUI, Keijiro TAKE, Atsushi OKAMURA
  • Publication number: 20180368005
    Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station use a beam to communicate to and from each other. The method includes a step of grouping, by the base station, when the base station is to receive a random access channel signal transmitted as a connection request from the terminal, a plurality of beam directions by combining a main beam direction, which is determined as suitable for reception of the random access channel signal, with one or more beam directions adjacent to the main beam direction, and of receiving the random access channel signal with use of the grouped plurality of beam directions.
    Type: Application
    Filed: February 29, 2016
    Publication date: December 20, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki FUKUI, Kazuaki ISHIOKA, Keijiro TAKE
  • Publication number: 20180183511
    Abstract: A frequency-sharing radio communication system that includes a terrestrial radio communication system and a satellite communication system and in which a frequency band of a radio wave used by a terrestrial base station and a radio terminal of the terrestrial radio communication system overlaps with a frequency band of a beam radiated from a satellite of the satellite communication system, includes: a monitoring device that stores management information that associates a frequency used by the terrestrial base station, the usage state of the frequency, and a frequency of the beam radiated to an area where the terrestrial base station is located; and a managing device that selects, based on the management information, the terrestrial base station that shares a frequency with the beam and is located within an irradiation range of the beam, and instructs the selected terrestrial base station to stop using the shared frequency.
    Type: Application
    Filed: January 21, 2015
    Publication date: June 28, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masao OGA, KEIJIRO TAKE
  • Publication number: 20180014212
    Abstract: A satellite communication terminal according to the present invention includes a wired I/F unit to receive monitoring information from a mobile base station, which is a result of monitoring a device state of the mobile base station, a wireless I/F unit to perform radio communication with a satellite, a storage device to store therein monitoring-information processing policy information that indicates conditions for selecting the monitoring information to be transferred to the wireless I/F unit from among the monitoring information, and a monitoring-information processing unit to select the monitoring information to be transferred to the wireless I/F unit from among the monitoring information on a basis of the monitoring-information processing policy information, and to transfer the selected monitoring information to the wireless I/F unit.
    Type: Application
    Filed: June 16, 2015
    Publication date: January 11, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masao OGA, Keijiro TAKE
  • Publication number: 20170208524
    Abstract: A base station of a wireless communication system including a plurality of base stations and a control station that controls the base stations, the base station including an antenna unit that forms a transmission beam and a reception beam, a transmitting and receiving unit that measures, when other base stations determine that a terminal communicating with the other base stations around the own station needs to perform handover, signals transmitted to the other base stations by a handover target terminal which is the terminal determined to need to carry out the handover, and a control unit that notifies the control station of measurement results of the signals as information referred to when the control station determines a handover destination of the handover target terminal.
    Type: Application
    Filed: May 27, 2015
    Publication date: July 20, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Noriyuki FUKUI, Keijiro TAKE
  • Patent number: 8089932
    Abstract: When a mobile device performs a handover from a first wireless base station to a second wireless base station, a base station controller sends a control message addressed to the second base station to notify the handover, to the first wireless base station via a wired line. The first wireless base station sends received control message to the second wireless base station using a pre-established wireless line. The wireless base stations exchange a control message to control the second wireless base station, a control message to control the mobile device, and user data of the mobile device and a communication partner, using the wireless line.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: January 3, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventor: Keijiro Take
  • Patent number: 7797002
    Abstract: In a radio access network in which a radio network controller is subjected to load distribution by a plurality of controllers, one of the controllers is set as a page controller that processes a paging message transmitted from a core network to the radio access network. When the paging control apparatus receives the paging message transmitted from the core network to the radio access network, the paging control apparatus judges a transmission destination of the paging message and transmits the paging message to the controllers that control a base station at the transmission destination.
    Type: Grant
    Filed: July 10, 2003
    Date of Patent: September 14, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Keijiro Take
  • Patent number: 7729318
    Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station from the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at a higher level of the candidate codes in the tree structure and being assignable to other mobile stations, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new staffing call message.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: June 1, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Keijiro Take
  • Publication number: 20090252113
    Abstract: A handover control server calculates a weight function of each peripheral cell of a cell to which a mobile device is currently connected, and notifies a cell list to the mobile device. The mobile device measures wireless-line qualities of peripheral cells registered in the cell list and the currently connected cell, calculates a peripheral-cell selection parameter of each cell based on a measured wireless-line quality, the cell list, weight function information, and a wireless-access capacity of the mobile device, and selects candidate cells of a handover destination based on a calculated peripheral-cell selection parameter.
    Type: Application
    Filed: November 21, 2005
    Publication date: October 8, 2009
    Applicant: Mitsubishi Electric Corporation
    Inventor: Keijiro Take
  • Patent number: 7593371
    Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: September 22, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Keijiro Take