Patents by Inventor Akio OHHASHI

Akio OHHASHI 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 control device, wireless communication system, and wireless communication method for control of changing transmission rate of packet to mobile station
    Patent number: 9078155
    Abstract: A wireless communication system includes an RNC and a BTS which communicates with the RNC. A congestion-notification transmitting unit of the BTS notifies the RNC of occurrence of congestion in a sector in which a mobile station is located. The RNC includes a congestion-notification receiving unit, a retransmission-ratio monitoring unit, and a transmission-rate control unit. The congestion-notification receiving unit detects the congestion occurrence by the notification from the BTS. The retransmission-ratio monitoring unit monitors a ratio of retransmission of a packet to the mobile station. The transmission-rate control unit performs control of changing a transmission rate of a packet to the mobile station according to the retransmission ratio when the congestion occurrence has been detected by the congestion-notification receiving unit.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: July 7, 2015
    Assignee: FUJITSU LIMITED
    Inventors: Shinya Hatakeyama, Yoshie Kitahara, Akio Ohhashi, Koichiro Higashi
  • COMMUNICATION CONTROL DEVICE, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD
    Publication number: 20140078897
    Abstract: A wireless communication system includes an RNC and a BTS which communicates with the RNC. A congestion-notification transmitting unit of the BTS notifies the RNC of occurrence of congestion in a sector in which a mobile station is located. The RNC includes a congestion-notification receiving unit, a retransmission-ratio monitoring unit, and a transmission-rate control unit. The congestion-notification receiving unit detects the congestion occurrence by the notification from the BTS. The retransmission-ratio monitoring unit monitors a ratio of retransmission of a packet to the mobile station. The transmission-rate control unit performs control of changing a transmission rate of a packet to the mobile station according to the retransmission ratio when the congestion occurrence has been detected by the congestion-notification receiving unit.
    Type: Application
    Filed: July 9, 2013
    Publication date: March 20, 2014
    Inventors: Shinya HATAKEYAMA, Yoshie KITAHARA, Akio OHHASHI, Koichiro HIGASHI
  • Packet transmission method and nodes
    Patent number: 8537708
    Abstract: This is a method for transmitting packets. The transmission method includes measuring a time taken for feedback indicating that a packet including context information has been lost; and switching between a first mode and a second mode based on the measured time taken for the feedback, the first mode being a mode for periodically transmitting a packet including the context information and the second mode being a mode for transmitting a packet including the context information in response to the feedback indicating that a packet including the context information has been lost.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: September 17, 2013
    Assignee: Fujitsu Limited
    Inventors: Atsushi Yabe, Yasuhiro Yoshika, Yashushi Miyagawa, Akio Ohhashi, Isamu Fukuda, Akihiro Kobayashi, Kouichirou Higashi
  • PACKET TRANSMITTING APPARATUS, PACKET RECEIVING APPARATUS, COMMUNICATION SYSTEM, AND PACKET COMMUNICATION METHOD
    Publication number: 20110235634
    Abstract: A packet transmitting apparatus 2 includes: a packet transmitting unit 20 which transmits a packet having a preassigned sequence number to a destination apparatus 3; a transmitted-packet indication information generating unit 21 which generates transmitted-packet indication information that indicates the packet transmitted by the packet transmitting unit 20; and a transmitted-packet indication information transmitting unit 23 which transmits the transmitted-packet indication information to the destination apparatus 3 separately from the packet.
    Type: Application
    Filed: June 6, 2011
    Publication date: September 29, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Isamu FUKUDA, Shinya HATAKEYAMA, Naoto IWAMURA, Akio OHHASHI
  • PACKET TRANSMISSION METHOD AND NODES
    Publication number: 20110211471
    Abstract: This is a method for transmitting packets. The transmission method includes measuring a time taken for feedback indicating that a packet including context information has been lost; and switching between a first mode and a second mode based on the measured time taken for the feedback, the first mode being a mode for periodically transmitting a packet including the context information and the second mode being a mode for transmitting a packet including the context information in response to the feedback indicating that a packet including the context information has been lost.
    Type: Application
    Filed: March 15, 2011
    Publication date: September 1, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Atsushi YABE, Yasuhiro YOSHIKA, Yasushi MIYAGAWA, Akio OHHASHI, Isamu FUKUDA, Akihiro KOBAYASHI, Kouichirou HIGASHI