Information transfer in a multi-mode global positioning system used with wireless networks
First Claim
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1. A geolocation system, comprising:
- a geolocation server, wherein the geolocation server receives at least one signal from at least one GPS satellite; and
a wireless communications device, comprising a GPS receiver section, the GPS receiver being selectively switchable between a standalone mode and at least one other mode for determining a geolocation of the wireless communications device, the at least one other mode is selected from a group comprising an autonomous mode, a network aided mode, a network centric mode, and a reverse aiding mode, wherein the wireless communication device selectively sends the determined geolocation of the wireless communication device to the geolocation server, the wireless communications device periodically transmitting a frequency reference message to the GPS receiver, and wherein the frequency reference message steers the call processing clock onto the base station clock.
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Abstract
The present invention discloses a GPS system that can operate in different modes depending on the network facilities and bandwidth available, the GPS information that can be acquired, or user or system requirements. The modes comprise standalone mode, where a mobile communications device computes the position of the device, an autonomous mode, where the mobile communications device transmits the computed position to a server, application, or PSAP in a communications network, a network aided mode, where the network aides the mobile communications device in deter mg the position of the device, a network based mode, and other modes.
163 Citations
19 Claims
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1. A geolocation system, comprising:
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a geolocation server, wherein the geolocation server receives at least one signal from at least one GPS satellite; and
a wireless communications device, comprising a GPS receiver section, the GPS receiver being selectively switchable between a standalone mode and at least one other mode for determining a geolocation of the wireless communications device, the at least one other mode is selected from a group comprising an autonomous mode, a network aided mode, a network centric mode, and a reverse aiding mode, wherein the wireless communication device selectively sends the determined geolocation of the wireless communication device to the geolocation server, the wireless communications device periodically transmitting a frequency reference message to the GPS receiver, and wherein the frequency reference message steers the call processing clock onto the base station clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A geolocation system, comprising:
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a geolocation server, wherein the geolocation server receives at least one signal from at least one GPS satellite; and
a wireless communications device, comprising a GPS receiver section, the GPS receiver comprising a GPS clock, the GPS receiver being selectively switchable between a standalone mode and at least one other mode for determining a geolocation of the wireless communications device, the GPS clock in the GPS receiver is periodically compared to the call processing clock to determine a frequency offset of the GPS clock, and the wireless communication device selectively sends the determined geolocation of the wireless communication device to the geolocation server, wherein the wireless communications device periodically transmits a frequency reference message to the GPS receiver, wherein the periodic transmission of the frequency reference message and the periodic comparison of the GPS clock to the call processing clock have the same period.
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Specification