EXPEDITED LOCATION DETERMINATION IN ANALOG SERVICE AREAS
First Claim
1. A method of expediting position determination in a dual-mode mobile terminal, the method comprising:
- storing position assistance data in said mobile terminal to expedite position determination;
updating said stored position assistance data when operating in a digital service area by acquiring updated assistance information from a supporting communication network; and
updating said stored position assistance data when operating in an analog service area by acquiring updated assistance information from supporting GPS satellites.
1 Assignment
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Accused Products
Abstract
A mobile terminal uses stored GPS data to expedite position determination 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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Citations
29 Claims
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1. A method of expediting position determination in a dual-mode mobile terminal, the method comprising:
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storing position assistance data in said mobile terminal to expedite position determination;
updating said stored position assistance data when operating in a digital service area by acquiring updated assistance information from a supporting communication network; and
updating said stored position assistance data when operating in an analog service area by acquiring updated assistance information from supporting GPS satellites. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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17. A mobile terminal comprising:
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a user interface to generate output information for a user, and to receive input information from the user;
a transmitter to transmit a transmit signal to a remote base station, said transmit signal containing data derived from said input information;
a receiver to receive a received signal from said remote base station, said received signal containing data used to generate said output information; and
a position detector comprising;
a satellite signal receiver to receive at least one satellite signal from a supporting position assistance satellite; and
processing logic to;
store position assistance data in said mobile terminal to expedite position determination;
update said stored position assistance data when operating in a digital service area by acquiring updated assistance information from a supporting communication network via said transmitter; and
update said stored position assistance data when operating in an analog service area by acquiring updated assistance information from supporting GPS satellites via said satellite signal receiver.
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Specification