Method and apparatus for location finding in a CDMA system
Position location system and method
Mobile station position determination in a wireless communication system
Method and apparatus for mobile emitter location
Method and system for determining position of a cellular mobile terminal
Geographical location system and method for locating radiotelephone engaged in a call Patent #: 6026305
ApplicationNo. 041764 filed on 03/13/1998
US Classes:455/456.2, Based on request signal455/457Location display
ExaminersPrimary: Hunter, Daniel S.
Assistant: Woldetatios, Yemane
Attorney, Agent or Firm
International ClassH04Q 007/20
Foreign Application Priority Data1997-03-14 JP
AbstractA mobile station position estimation scheme for a cellular mobile communication system which is capable of estimating a position of a mobile station in a simple manner even in the general cellular mobile communication systems in which base stations are not synchronized. According to this mobile station position estimation scheme, a first signal sequence and a second signal sequence which are uniquely predetermined for the mobile station are exchanged between the mobile station and the base station, and then a position of the mobile station is estimated at one station among the base station and the mobile station, by obtaining a phase difference between the first signal sequence and the second signal sequence and calculating an estimated distance between the base station and the mobile station according to the phase difference.