Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-06-03
2008-06-03
Ly, Nghi H. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S404200, C455S414200, C455S422100, C455S423000, C342S357490
Reexamination Certificate
active
07383049
ABSTRACT:
In a wireless telecommunication network, hybrid (GPS and AFLT) mobile stations provide redundant position information, which is used for time base calibration and/or correction of position measurements. Every mobile station (i.e., handset or cellular phone) can be used as a test instrument, and data from regular wireless phone calls can be supplemented by data from drive-around field test units. The time base and/or position offsets are stored in a base station almanac data base along with other information used for obtaining the most reliable position fixes under a variety of conditions. An automatic system is provided for creating, updating, and maintaining the base station almanac data base. The automatic system not only characterizes the performance of the wireless network but also characterizes the performance of the position determination system. The automatic system provides performance feedback to system operators and customers.
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International Search Report ISA EPO PCT/US02/41255 Aug. 13, 2003.
Biacs Zoltan
Deloach, Jr. James D.
Girerd Richard John
Marshall Grant
Moeglein Mark
Bachand Richard
Gunderson Linda G.
Ly Nghi H.
Qualcomm Incorporated
Rouse Thomas
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