Patents by Inventor Kei Mitsunaga

Kei Mitsunaga 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).

  • Network system, node, packet forwarding method, program, and recording medium
    Patent number: 9220047
    Abstract: There are proposed: a network system capable of realizing packet forwarding higher in packet forwarding efficiency than in conventional Intermittent Periodic Transmit (IPT) using omni-directional antennas; and the like. Directional antennas are applied to the IPT, and each of slave nodes waits for reception of downlink packets by a directional antenna for receiving the downlink packets in a reception waiting state therefor. Moreover, the downlink packets are treated like polling control signals, and uplink packets are transmitted at a reception time of the downlink packets, whereby a hidden node problem and a carrier sensing problem can be avoided. Furthermore, in accordance with routing protocol in which each of nodes changes directivity randomly by a route formation process, it becomes possible to form a more suitable route.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: December 22, 2015
    Assignee: Kyushu University, National University Corporation
    Inventors: Hiroshi Furukawa, Kei Mitsunaga
  • NETWORK SYSTEM, NODE,PACKET FORWARDING METHOD, PROGRAM, AND RECORDING MEDIUM
    Publication number: 20110090835
    Abstract: There are proposed: a network system capable of realizing packet forwarding higher in packet forwarding efficiency than in conventional Intermittent Periodic Transmit (IPT) using omni-directional antennas; and the like. Directional antennas are applied to the IPT, and each of slave nodes waits for reception of downlink packets by a directional antenna for receiving the downlink packets in a reception waiting state therefor. Moreover, the downlink packets are treated like polling control signals, and uplink packets are transmitted at a reception time of the downlink packets, whereby a hidden node problem and a carrier sensing problem can be avoided. Furthermore, in accordance with routing protocol in which each of nodes changes directivity randomly by a route formation process, it becomes possible to form a more suitable route.
    Type: Application
    Filed: March 30, 2009
    Publication date: April 21, 2011
    Applicant: KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Hiroshi Furukawa, Kei Mitsunaga