Patents by Inventor Hirotaka Yoshizu

Hirotaka Yoshizu 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).

  • Congestion control system, congestion control method, congestion control program, and program recording medium
    Patent number: 7768917
    Abstract: In the present invention, a service network includes, when user terminals are divided by area, subscriber accommodation nodes that accommodate the user terminals present in the respective areas and relay nodes that perform relay of information among the subscriber accommodation nodes. The congestion control system further includes an edge router that routes a processing request for a communication service received from each of the user terminals to each of the subscriber accommodation nodes on the service network side as a control message and a congestion control server that controls congestion states of the subscriber accommodation nodes and the relay nodes. The subscriber accommodation node detects, when congestion occurs or it is likely that congestion occurs in the subscriber accommodation node because of a large number of control messages from the edge router, the occurrence of the congestion or the likelihood of occurrence of congestion and notifies the congestion control server to that effect.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: August 3, 2010
    Assignee: NEC Corporation
    Inventors: Yoshitarou Nakayama, Hirotaka Yoshizu, Kazuki Inoue
  • CONGESTION CONTROL SYSTEM, CONGESTION CONTROL METHOD, CONGESTION CONTROL PROGRAM, AND PROGRAM RECORDING MEDIUM
    Publication number: 20080212482
    Abstract: In the present invention, a service network includes, when user terminals are divided by area, subscriber accommodation nodes that accommodate the user terminals present in the respective areas and relay nodes that perform relay of information among the subscriber accommodation nodes. The congestion control system further includes an edge router that routes a processing request for a communication service received from each of the user terminals to each of the subscriber accommodation nodes on the service network side as a control message and a congestion control server that controls congestion states of the subscriber accommodation nodes and the relay nodes. The subscriber accommodation node detects, when congestion occurs or it is likely that congestion occurs in the subscriber accommodation node because of a large number of control messages from the edge router, the occurrence of the congestion or the likelihood of occurrence of congestion and notifies the congestion control server to that effect.
    Type: Application
    Filed: January 9, 2008
    Publication date: September 4, 2008
    Inventors: Yoshitarou Nakayma, Hirotaka Yoshizu, Kazuki Inoue