Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
1998-09-09
2001-01-30
Le, Thanh Cong (Department: 2749)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S456500, C342S357490
Reexamination Certificate
active
06181911
ABSTRACT:
BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to position location. More particularly, the present invention relates to a novel and improved method and apparatus for performing position location in wireless communications system.
II. Description of the Related Art
Both government regulation and consumer demand have driven the demand for position location functionality in cellular telephones. The global positioning system (GPS) is currently available for performing position location using a GPS receiver in conjunction with a set of earth orbiting satellites. It is therefore desirable to introduce GPS functionality into a cellular telephone.
Cellular telephones, however, are extremely sensitive to cost, weight and power consumption considerations. Thus, simply adding additional circuitry for performing GPS location is an unsatisfactory solution for providing position location functionality in a cellular telephone. Thus, the present invention is directed to providing GPS functionality in a cellular telephone system with a minimum of additional hardware, cost and power consumption.
SUMMARY OF THE INVENTION
The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment comprises a method for performing position location using a set of signals transmitted from a set of satellites including the steps of storing coarse search data, performing a coarse search on said coarse search data for each satellite from said set of satellites, receiving fine search data, performing a set of fine searches on said fine search data, each fine search being performed on a different time segment of said fine search data, and reporting results.
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Understanding GPS Principles and Applications,/Kaplan, Elliott D.. Boston, MA : Artech House, c1996 Chapters 4 and 5.
Fevrier Ian J.
Kang Inyup
Sih Gilbert C.
Zou Qiuzhen
Brown Charles D
Cong Le Thanh
Hom Raymond
Qualcomm Incorporated
Wadsworth Phillip
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