Patents by Inventor Hiroyuki Tomishima

Hiroyuki Tomishima 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).

  • Mobile communication system
    Patent number: 7024201
    Abstract: By detecting a degraded state of wireless transmission quality due to steady occurrence of re-transmission in an early stage to lead to a call connection, a service quality is made sure, an excess time charge on an end user is prevented and wireless resources are utilized efficiently. A base station controller monitors a PDU transmission state in a wireless link to a mobile station in call unit, calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality, determines a degradation of the wireless transmission quality when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value and performs a disconnection processing for the call.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: April 4, 2006
    Assignee: NEC Corporation
    Inventors: Hiroyuki Tomishima, Hirofumi Shiotsuki
  • Mobile communication system
    Publication number: 20030119516
    Abstract: By detecting a degraded state of wireless transmission quality due to steady occurrence of re-transmission in an early stage to lead to a call connection, a service quality is made sure, an excess time charge on an end user is prevented and wireless resources are utilized efficiently. A base station controller monitors a PDU transmission state in a wireless link to a mobile station in call unit, calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality, determines a degradation of the wireless transmission quality when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value and performs a disconnection processing for the call.
    Type: Application
    Filed: December 12, 2002
    Publication date: June 26, 2003
    Applicant: NEC CORPORATION
    Inventors: Hiroyuki Tomishima, Hirofumi Shiotsuki