Title:
MAINTENANCE OF A CALIBRATION DATA BASE FOR POSITION LOCATION DETERMINATION OF WIRELESS MOBILE STATIONS
Document Type and Number:
WIPO Patent Application WO2003065740
Kind Code:
A3
Abstract:
In a wireless telecommunications 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 calibration 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 calibration 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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Inventors:
DELOACH JAMES D JR
VAYANOS ALKINOOS H
WILSON BRUCE
GIRERD RICHARD JOHN
MARSHALL GRANT
MOEGLEIN MARK
RICK ROLLAND
SMITH SCOTT
PATEL SUNIL
RILEY WYATT
BIACS ZOLTAN
VAYANOS ALKINOOS H
WILSON BRUCE
GIRERD RICHARD JOHN
MARSHALL GRANT
MOEGLEIN MARK
RICK ROLLAND
SMITH SCOTT
PATEL SUNIL
RILEY WYATT
BIACS ZOLTAN
Application Number:
PCT/US2002/041255
Publication Date:
October 16, 2003
Filing Date:
December 26, 2002
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
G01S5/02; G01S5/14; G01S19/09; G01S19/46; G01S19/25; H04W64/00; (IPC1-7): H04Q7/38; G01S5/02; G01S13/87
Foreign References:
| US6230018B1 | 2001-05-08 | |||
| US6014102A | 2000-01-11 | |||
| US6166685A | 2000-12-26 |
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