Patents by Inventor Jee Hwan Ahn

Jee Hwan Ahn 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).

  • Patent number: 5682380
    Abstract: A hard-handoff control method for a CDMA mobile switching center includes the steps of detecting an original target switching center number of a switching center for managing a target cell of the handoff request message; converting the speech channel of the mobile station to second switching center areas by determining that the mobile station shifts from the first anchor station in the first switching center to a second anchor station if the target switching center number detected is same as its own switching center number; determining the position of the switching center areas where the mobile station opens a speech path if the target switching center number detected is different from its own switching center original number; converting the speech channel of the mobile station to the second switching center areas if the first switching center is determined as the anchor switching center; comparing the target switching center number with the anchor switching center number if the first switching center is not
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: October 28, 1997
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyun-Hwa Park, Dong-Su Jung, Dae-Sik Kim, Jee-Hwan Ahn