Patents by Inventor Tatsunori Ohara

Tatsunori Ohara 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).

  • Transmission power adjustment method in wireless communication system and base station
    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
  • TRANSMISSION POWER ADJUSTMENT METHOD IN WIRELESS COMMUNICATION SYSTEM AND BASE STATION
    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