Patents by Inventor Hajime Kanzaki

Hajime Kanzaki 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: 10880945
    Abstract: A gateway device is wirelessly connected to a mobile device and a control device that is connected to the gateway device and controls the mobile device. The mobile device reports a completion report indicating completion of a movement work according to a movement control instruction from the control device, and wherein the control device includes a work control unit that transmits the movement control instruction to the mobile device. It is determined whether or not a failure has occurred in communication between the control device and the gateway device, and it is determined whether or not the movement control instruction executed by the mobile device passes through the gateway device in which the failure determined by the failure detection unit has occurred, and stops transmission of the movement control instruction of passing through the gateway device in which the failure has occurred to the mobile device.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: December 29, 2020
    Assignee: HITACHI, LTD.
    Inventors: Hajime Kanzaki, Daisuke Ishii, Toshiyuki Saito
  • Publication number: 20190246444
    Abstract: A gateway device is wirelessly connected to a mobile device and a control device that is connected to the gateway device and controls the mobile device. The mobile device reports a completion report indicating completion of a movement work according to a movement control instruction from the control device, and wherein the control device includes a work control unit that transmits the movement control instruction to the mobile device. It is determined whether or not a failure has occurred in communication between the control device and the gateway device, and it is determined whether or not the movement control instruction executed by the mobile device passes through the gateway device in which the failure determined by the failure detection unit has occurred, and stops transmission of the movement control instruction of passing through the gateway device in which the failure has occurred to the mobile device.
    Type: Application
    Filed: November 9, 2016
    Publication date: August 8, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Hajime KANZAKI, Daisuke ISHII, Toshiyuki SAITO
  • Patent number: 8891390
    Abstract: Provided is a wireless communication system which includes a wireless communication unit using plural frequency bands and plural antennas. The system changes the transmission power of each antenna, based on the interference of each of the frequency bands from the neighbor base station along the antenna direction. The system estimates the number of antennas necessary for transmission in response to a user requirement, and determines a necessary antenna in accordance with the antenna direction in which the terminal is located, and further changes the transmission power of each antenna.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: November 18, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Hajime Kanzaki, Kenzaburo Fujishima, Mikio Kuwahara, Katsuhiko Tsunehara
  • Patent number: 8886248
    Abstract: Necessary transmission power of terminals is secured while suppressing total transmission power in base station, so that FFR technology is realized with high frequency utilization efficiency to thereby realize both of compactness of base station and increase of communication capacity. Frequency resource is divided into frequency for boundary area of cell and frequency for central area of cell. Transmission power per unit frequency is fixed in the frequency for boundary area of cell and is set to be variable in the frequency for central area of cell. Transmission power per unit frequency is adjusted so as to satisfy necessary power of terminals connected to frequency for central area of cell. When it is judged that total transmission power of base station exceeds prescribed value, terminal is moved from central area to boundary area of cell, so that total transmission power is suppressed to be equal to or smaller than standard.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: November 11, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Tatsunori Ohara, Mikio Kuwahara, Hajime Kanzaki, Tsukasa Sasayama
  • Patent number: 8862167
    Abstract: A radio communication system is provided in which, based on a measurement condition and neighbor information specified by a base station to which a mobile terminal is connected, the mobile terminal measures the reception quality of the neighboring base stations included in the neighbor information and, when a transmission request is received from the connected base station, transmits the measurement result to the connected base station. In this radio communication system, the base station transmits neighbor information, which specifies the base stations for which interference measurement is to be performed, and a measurement result transmission request to the mobile terminal at a predetermined time for measuring the interference of neighboring base stations and, in response to it, the mobile terminal transmits the measurement result of the base stations, specified by the base station for measuring the interference, to the base station.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: October 14, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Tsukasa Sasayama, Mikio Kuwahara, Koichiro Furueda, Hajime Kanzaki
  • Publication number: 20140256331
    Abstract: Information is exchanged among multiple base stations by adaptively changing an allocation of radio resource of each base station, and reducing deterioration in a signal quality that is caused by interference of signals transmitted from multiple base stations. Communication with a terminal located in a cell center and communication with a terminal located in a cell edge are performed in different time zones. In addition, communication is performed such that time zones do not overlap in the cell edge between multiple neighbor base station devices. In addition, efficiency that is an index representing the number of bits transmittable per resource element is calculated using a scanning result of a terminal, and one base station that decides a radio resource allocation between cells decides radio resources to be allocated to a terminal located in a cell center and radio resources to be allocated to the cell edge using the efficiency information.
    Type: Application
    Filed: August 16, 2012
    Publication date: September 11, 2014
    Applicant: HITACHI, LTD.
    Inventors: Hiroto Adachi, Mikio Kuwahara, Hajime Kanzaki
  • Patent number: 8619690
    Abstract: In a cellular radio communication system including of multi-antenna base stations, to make effective use of the reduced interference in supposing the use of beam form and avoid the interference in an adjacent station even if a space multiplex and the beam form are mixed. Frequencies intended for the cell edge in an FFR are classified into frequencies for space multiplex and a frequency for beam form. Thereby, a frequency at which the interference is reduced by the beam form is fixed. A frequency intended for the cell center is in a frequency band and signals are transmitted from three base stations.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: December 31, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Mikio Kuwahara, Hajime Kanzaki, Kenichi Azuma
  • Patent number: 8583153
    Abstract: When DFFR is performed in a heterogeneous environment in which a pico base station coexists in the area of a macro base station and when the pico base station judges that, based on the received-signal quality report result from a mobile terminal, the macro base station causes interference to the pico base station, the pico base station reports an interference power threshold to be notified to the macro base station based on the transmission power setting value of the macro base station, the transmission power setting value of the pico base station, and the estimated interference amount calculated from the scan report result. The macro base station transmits a result of comparison between the transmission powers of multiple frequency resources and the interference power threshold, to the pico base station and the pico base station selects a frequency resource, unlikely to be affected by interference.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: November 12, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Koichiro Furueda, Tsukasa Sasayama, Mikio Kuwahara, Hajime Kanzaki
  • Patent number: 8515483
    Abstract: In a conventional cellular wireless communication system that included a plurality of base station apparatuses having a plurality of antennas, just two antennas were used for simultaneous transmission by transmission diversity, and the antenna usage efficiency was low. According to the present invention, a free transmission diversity antenna for transmission to the edge of a cell is used to send a signal to a terminal located around the center of the cell without causing interference to a terminal located around the edge of the cell. The two terminals located around the edge of the cell and around the center of the cell are paired for simultaneous signal transmission. A signal directed to the edge of the cell and a signal directed to the center of the cell are sent with greatly different transmission power. This reduces the interference caused by the signal directed to the center of the cell to an insignificant level for the terminal located around the edge of the cell.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: August 20, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Mikio Kuwahara, Hajime Kanzaki
  • Publication number: 20130003669
    Abstract: Necessary transmission power of terminals is secured while suppressing total transmission power in base station, so that FFR technology is realized with high frequency utilization efficiency to thereby realize both of compactness of base station and increase of communication capacity. Frequency resource is divided into frequency for boundary area of cell and frequency for central area of cell. Transmission power per unit frequency is fixed in the frequency for boundary area of cell and is set to be variable in the frequency for central area of cell. Transmission power per unit frequency is adjusted so as to satisfy necessary power of terminals connected to frequency for central area of cell. When it is judged that total transmission power of base station exceeds prescribed value, terminal is moved from central area to boundary area of cell, so that total transmission power is suppressed to be equal to or smaller than standard.
    Type: Application
    Filed: June 12, 2012
    Publication date: January 3, 2013
    Inventors: Tatsunori Ohara, Mikio Kuwahara, Hajime Kanzaki, Tsukasa Sasayama
  • Patent number: 8249195
    Abstract: A wireless communication apparatus comprising a memory for storing a group of coefficient values to be applied to processing of orthogonal modulation signals received by a plurality of antenna elements, a coefficient generation unit for detecting a phase shift value of reception timing of specific received signals on the basis of a desired signal and the coefficient values read out from the memory, compensating the group of coefficient values according to the detected phase shift value, and storing the compensated coefficient values in the memory, and a signal processing unit for processing the received signals by applying the compensated coefficient values.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: August 21, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hajime Kanzaki, Satoshi Tamaki, Koichiro Furueda
  • Publication number: 20120140658
    Abstract: Provided is a wireless communication system which includes a wireless communication unit using plural frequency bands and plural antennas. The system changes the transmission power of each antenna, based on the interference of each of the frequency bands from the neighbor base station along the antenna direction. The system estimates the number of antennas necessary for transmission in response to a user requirement, and determines a necessary antenna in accordance with the antenna direction in which the terminal is located, and further changes the transmission power of each antenna.
    Type: Application
    Filed: December 1, 2011
    Publication date: June 7, 2012
    Inventors: Hajime KANZAKI, Kenzaburo Fujishima, Mikio Kuwahara, Katsuhiko Tsunehara
  • Publication number: 20120094702
    Abstract: When DFFR is performed in a heterogeneous environment in which a pico base station coexists in the area of a macro base station and when the pico base station judges that, based on the received-signal quality report result from a mobile terminal, the macro base station causes interference to the pico base station, the pico base station reports an interference power threshold to be notified to the macro base station based on the transmission power setting value of the macro base station, the transmission power setting value of the pico base station, and the estimated interference amount calculated from the scan report result. The macro base station transmits a result of comparison between the transmission powers of multiple frequency resources and the interference power threshold, to the pico base station and the pico base station selects a frequency resource, unlikely to be affected by interference.
    Type: Application
    Filed: September 23, 2011
    Publication date: April 19, 2012
    Applicant: HITACHI, LTD.
    Inventors: Koichiro FURUEDA, Tsukasa SASAYAMA, Mikio KUWAHARA, Hajime KANZAKI
  • Publication number: 20120094703
    Abstract: A radio communication system is provided in which, based on a measurement condition and neighbor information specified by a base station to which a mobile terminal is connected, the mobile terminal measures the reception quality of the neighboring base stations included in the neighbor information and, when a transmission request is received from the connected base station, transmits the measurement result to the connected base station. In this radio communication system, the base station transmits neighbor information, which specifies the base stations for which interference measurement is to be performed, and a measurement result transmission request to the mobile terminal at a predetermined time for measuring the interference of neighboring base stations and, in response to it, the mobile terminal transmits the measurement result of the base stations, specified by the base station for measuring the interference, to the base station.
    Type: Application
    Filed: September 21, 2011
    Publication date: April 19, 2012
    Applicant: HITACHI, LTD.
    Inventors: Tsukasa SASAYAMA, Mikio KUWAHARA, Koichiro FURUEDA, Hajime KANZAKI
  • Publication number: 20110223962
    Abstract: In a conventional cellular wireless communication system that included a plurality of base station apparatuses having a plurality of antennas, just two antennas were used for simultaneous transmission by transmission diversity, and the antenna usage efficiency was low. According to the present invention, a free transmission diversity antenna for transmission to the edge of a cell is used to send a signal to a terminal located around the center of the cell without causing interference to a terminal located around the edge of the cell. The two terminals located around the edge of the cell and around the center of the cell are paired for simultaneous signal transmission. A signal directed to the edge of the cell and a signal directed to the center of the cell are sent with greatly different transmission power. This reduces the interference caused by the signal directed to the center of the cell to an insignificant level for the terminal located around the edge of the cell.
    Type: Application
    Filed: February 4, 2011
    Publication date: September 15, 2011
    Inventors: Mikio Kuwahara, Hajime Kanzaki
  • Publication number: 20110158190
    Abstract: In a cellular radio communication system including of multi-antenna base stations, to make effective use of the reduced interference in supposing the use of beam form and avoid the interference in an adjacent station even if a space multiplex and the beam form are mixed. Frequencies intended for the cell edge in an FFR are classified into frequencies for space multiplex and a frequency for beam form. Thereby, a frequency at which the interference is reduced by the beam form is fixed. A frequency intended for the cell center is in a frequency band and signals are transmitted from three base stations.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 30, 2011
    Inventors: Mikio KUWAHARA, Hajime Kanzaki, Kenichi Azuma
  • Publication number: 20110003599
    Abstract: A wireless communication system includes plural wireless base station apparatuses and plural mobile station apparatuses, in which the base station apparatuses and mobile station apparatuses are capable of communication with each other via radio resources, each base station apparatus allocates guaranteed resources to be allocated to a mobile station apparatus for a given duration for transmission/reception of data with a specified capacity among data to be transmitted/received and includes a resource allocation notification unit that notifies the mobile station apparatus of the results of allocation performed by the resource allocation unit. A wireless communication base station and a wireless mobile station in the wireless communication system are also provided.
    Type: Application
    Filed: July 6, 2010
    Publication date: January 6, 2011
    Inventors: Hajime KANZAKI, Satoshi Tamaki, Ichiro Murata
  • Publication number: 20090207932
    Abstract: A wireless communication apparatus comprising a memory for storing a group of coefficient values to be applied to processing of orthogonal modulation signals received by a plurality of antenna elements, a coefficient generation unit for detecting a phase shift value of reception timing of specific received signals on the basis of a desired signal and the coefficient values read out from the memory, compensating the group of coefficient values according to the detected phase shift value, and storing the compensated coefficient values in the memory, and a signal processing unit for processing the received signals by applying the compensated coefficient values.
    Type: Application
    Filed: February 11, 2009
    Publication date: August 20, 2009
    Inventors: Hajime KANZAKI, Satoshi Tamaki, Koichiro Furueda