Title:
EXPEDITED LOCATION DETERMINATION IN ANALOG SERVICE AREAS
Document Type and Number:
WIPO Patent Application WO2002065794
Kind Code:
A8
Abstract:
A mobile terminal uses stored GPS data to expedite position determination (Fig. 1) when placing emergency calls. The mobile terminal receives supporting GPS data such as almanac and ephemeris information from a supporting digital wireless network when digital service is available. When operating in an analog service area where GPS data is not available from the analog wireless network, the mobile terminal uses GPS data previously received in a digital service area, unless that data is too old to be useful. Additionally, the mobile terminal can periodically update its stored GPS data while in standby in an analog service area, based on receiving the needed data directly from available GPS satellites. The mobile terminal or digital wireless network may automatically update GPS data stored in the mobile terminal based on the age of stored data, or based on the probability of moving into an analog service area.
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Inventors:
BOESCH RONALD D (US)
KOORAPATY HAVISH (US)
BLOEBAUM LELAND S (US)
KOORAPATY HAVISH (US)
BLOEBAUM LELAND S (US)
Application Number:
PCT/US2002/003368
Publication Date:
May 19, 2005
Filing Date:
February 05, 2002
Export Citation:
Assignee:
ERICSSON INC (US)
BOESCH RONALD D (US)
KOORAPATY HAVISH (US)
BLOEBAUM LELAND S (US)
BOESCH RONALD D (US)
KOORAPATY HAVISH (US)
BLOEBAUM LELAND S (US)
International Classes:
G01S1/00; H04W88/06; (IPC1-7): H04Q7/20
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