Patents by Inventor Masato Tachiki

Masato Tachiki 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).

  • Communication system, mobile station, and communication method
    Patent number: 9320071
    Abstract: A UE 100 is connectable to an IP-CAN conforming to Internet protocol via any one of LTE supporting a service conforming to an IP multimedia subsystem and 3G not supporting the service conforming to the IP multimedia subsystem. In a case where the UE 100 receives a connection rejection notification from a SGSN capable of communicating with the IP multimedia subsystem after transitioning from LTE to 3G, the UE 100 suspends transmission of a request for reconnection to the IP access network only if the mobile station is camping in 3G through which the connection rejection notification has been received. Here, the connection rejection notification indicates that the UE 100 is not connectable to the IP multimedia subsystem.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: April 19, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Itsuma Tanaka, Masato Tachiki, Shinya Takeda
  • COMMUNICATION SYSTEM, MOBILE STATION, AND COMMUNICATION METHOD
    Publication number: 20150063235
    Abstract: A UE 100 is connectable to an IP-CAN conforming to Internet protocol via any one of LTE supporting a service conforming to an IP multimedia subsystem and 3G not supporting the service conforming to the IP multimedia subsystem. In a case where the UE 100 receives a connection rejection notification from a SGSN capable of communicating with the IP multimedia subsystem after transitioning from LTE to 3G, the UE 100 suspends transmission of a request for reconnection to the IP access network only if the mobile station is camping in 3G through which the connection rejection notification has been received. Here, the connection rejection notification indicates that the UE 100 is not connectable to the IP multimedia subsystem.
    Type: Application
    Filed: February 26, 2013
    Publication date: March 5, 2015
    Inventors: Itsuma Tanaka, Masato Tachiki, Shinya Takeda