Patents by Inventor Tetsunori Tada

Tetsunori Tada 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).

  • Collision avoidance technique for a multiple access radio communication system
    Patent number: 6680950
    Abstract: A radio base station, when detecting a collision of reception signals, transmits an access-restricted transmission allow signal IDLE2 to a irrelevant-to-collision radio terminal PS3 for access restriction. A plurality of relevant-to-collision radio terminals PS1 and PS2, when receiving the access-restricted transmission allow signal, set transmission delay times TR1 and TR2 determined by random numbers, respectively, and when receiving the access-restricted transmission allow signal after the lapse of their respective delay times, start the same transmission operation as when receiving a normal transmission allow signal. A separate radio terminal PS3, when receiving the access-restricted transmission allow signal before intended new signal transmission, suspends the new signal transmission until receiving the normal transmission allow signal.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: January 20, 2004
    Assignee: NEC Corporation
    Inventors: Masahiro Nagata, Tetsunori Tada