Patents by Inventor Tatsuya Wakuta

Tatsuya Wakuta 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).

  • Method and apparatus for performing handoff by varying threshold level
    Patent number: 7089007
    Abstract: A method and a wireless communication control apparatus for handing off a mobile station in a mobile communication system including at least two wireless base stations. A handoff threshold which is set in the mobile station is varied according to quality of a wireless link between the mobile station and a first wireless base station which currently controls the mobile station. Then, the processing for handing off the mobile station from the first wireless base station to a second wireless base station is performed based on the handoff threshold.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: August 8, 2006
    Assignee: Fujitsu Limited
    Inventors: Tatsuya Wakuta, Hitoshi Koike, Ryuichi Sato
  • Method and apparatus for performing handoff by varying threshold level
    Publication number: 20050221828
    Abstract: A method and a wireless communication control apparatus for handing off a mobile station in a mobile communication system including at least two wireless base stations. A handoff threshold which is set in the mobile station is varied according to quality of a wireless link between the mobile station and a first wireless base station which currently controls the mobile station. Then, the processing for handing off the mobile station from the first wireless base station to a second wireless base station is performed based on the handoff threshold.
    Type: Application
    Filed: June 1, 2005
    Publication date: October 6, 2005
    Inventors: Tatsuya Wakuta, Hitoshi Koike, Ryuichi Sato
  • Base transceiver station equipment and radio subsystem
    Patent number: 6738619
    Abstract: A base transceiver station equipment, and a radio subsystem using the same, provided a radio interface unit for forming a radio zone, receiving signals transmitted by a mobile station located in that radio zone based on a channel setting procedure or transmitted in a speech state, and measuring the quality of transmission; an identification information acquisition unit for acquiring identification information added to these received signals by a mobile station or identification information indicating a timing when those signals were received; a control unit for interfacing with the radio interface unit and a communication link formed with base station control equipment which takes the lead in the channel setting; and the control unit transmits transmission information given as a signal with a measured quality of transmission exceeding a threshold value among signals received by the radio interface unit and the identification information obtained by the identification information acquisition unit for this sign
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: May 18, 2004
    Assignee: Fujitsu Limited
    Inventors: Hidehito Yabuta, Tatsuya Wakuta