Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-05-31
2005-05-31
Hudspeth, David (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S422100, C455S404100, C342S357490, C342S357490
Reexamination Certificate
active
06901260
ABSTRACT:
A differential GPS or GLONASS system (collectively referred to herein as a ‘GPS system’) is implemented for use by a base station of a wireless telephone system (e.g., by a cellular telephone base station). Using the differential GPS system, a differential location ‘correction’ factor is determined based on a difference between a received GPS location signal and a known fixed location of a GPS system receiver for the base station. A differential GPS correction signal containing the correction factor is transmitted to any or all cellular telephone users of that base station to allow the cellular telephones to improve the accuracy of location information independently measured by GPS receivers located in each of the cellular telephones. The differential GPS signal may be used to increase the accuracy of the GPS system, whatever the current accuracy of the GPS system, allowing practical implementation of an emergency telephone system such as a 911 system using a wireless system such as a cellular telephone system.
REFERENCES:
patent: 6246376 (2001-06-01), Bork et al.
patent: 6275707 (2001-08-01), Reed et al.
patent: 6295455 (2001-09-01), Fischer et al.
patent: 6580372 (2003-06-01), Harris
patent: 0 978728 (2000-09-01), None
patent: WO 99/54753 (1999-10-01), None
Hudspeth David
Lucent Technologies - Inc.
Smith S.
LandOfFree
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