Patents by Inventor Sun Bae Lim

Sun Bae Lim 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).

  • Hard handoff method between an asynchronous CDMA system and a synchronous CDMA system
    Patent number: 7151756
    Abstract: A hard handoff method between asynchronous CDMA (code division multiple access) system and synchronous CDMA system is provided. A hard handoff method between asynchronous CDMA (code division multiple access) system and synchronous CDMA system in accordance with an embodiment of the present invention includes following steps. First step is to transmit asynchronous CDMA channels from synchronous CDMA base stations with a purpose of synchronizing handoff time at synchronous CDMA base station and code used at synchronous CDMA base station. The transmission is done by a mobile terminal that is in communication with an asynchronous CDMA base station. The transmission is a part of handoff process and the mobile terminal performs hard handoff to synchronous CDMA base station. Second step is to report measured result to the asynchronous CDMA base station on the basis of intensity of asynchronous CDMA pilot channel received from an adjacent synchronous CDMA base station. The reporting is done by the mobile terminal.
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: December 19, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kyu Tae Park, Kwang Ryul Jung, Pyon Jung Song, Sun Bae Lim