Patents by Inventor Sang Cheon Lee

Sang Cheon Lee 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).

  • Code division multiple access (CDMA) automatic call simulator
    Patent number: 5627834
    Abstract: An automatic call simulator for simulating call processing capacity and performance between a base station and a mobile station of a CDMA mobile communication system is disclosed. A mobile station has a communication port for serial communication with an external unit. An operating unit controls all the mobile station by operating software, generates the state of each mobile station during simulation and a simulation result, and records simulation result data. An interface unit for interfacing the mobile station with the operation unit is included within a metal box so as not to be influenced by an external electromagnetic wave and has external terminals connected to the mobile station and to the operation unit. The interface unit and the mobile station are connected through the communication port.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: May 6, 1997
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ki-Chul Han, Duck-Bin Im, In-Myoung Jeong, Sang-Cheon Lee