Data messaging efficiency for an assisted wireless position determination system
DCFirst Claim
1. A method for messaging position-based information in an assisted wireless position determination system, comprising:
- receiving first aiding information from a position determination entity (PDE) via a wireless communication link;
determining a redundant satellite positioning signal based on said received first aiding information;
transmitting a request for second aiding information based on said determined redundant satellite positioning signal to said PDE via said wireless communication link;
receiving said requested second aiding information from said PDE via said wireless communication link;
locating a necessary satellite positioning signal from a positioning satellite based on said received second aiding information; and
determining a geographic position based on said located satellite positioning signal.
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Abstract
An assisted wireless position determination system includes a plurality of base stations and a plurality of wireless devices, such as mobile telephones and personal digital assistants, adapted to communicate with the base stations. The wireless position determination system also includes a position determination system for determining the geographic position of the wireless devices. The position determination system includes a position determination entity (PDE) that is connected to the base stations and serves as a processing server for computing the position of the wireless devices. The system and method reduces or eliminates redundant and superfluous data. In addition, the system and method ensure that the wireless device is not loaded with additional capacity, and that the wireless device is provided with precise location information. The embodiments of the system and method of the invention are compliant with the TIA/EIA IS-801 standard or other standards.
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Citations
31 Claims
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1. A method for messaging position-based information in an assisted wireless position determination system, comprising:
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receiving first aiding information from a position determination entity (PDE) via a wireless communication link;
determining a redundant satellite positioning signal based on said received first aiding information;
transmitting a request for second aiding information based on said determined redundant satellite positioning signal to said PDE via said wireless communication link;
receiving said requested second aiding information from said PDE via said wireless communication link;
locating a necessary satellite positioning signal from a positioning satellite based on said received second aiding information; and
determining a geographic position based on said located satellite positioning signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for messaging position-based information in an assisted wireless position determination system, the method comprising:
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obtaining Acquisition Assistance (AA) information;
performing a shallow search for a first plurality of satellite positioning signals for a plurality of Global Positioning System (GPS) satellites based on said AA information;
locating said first plurality of satellite positioning signals from said plurality of GPS satellites based on said shallow search;
determining whether said first plurality of satellites positioning signals located by said shallow search have enough satellite positioning signals to yield an acceptable geographic position fix for a wireless device;
transmitting a request for sensitivity assistance (SA) information for yielding a second plurality of satellite positioning signals from said plurality of GPS satellites if said first plurality of satellites positioning signals do not have enough satellite positioning signals to yield said acceptable geographic position fix for said wireless device;
receiving said requested SA information for yielding said second plurality of satellite positioning signals from said plurality of GPS satellites;
performing a deep search for said second plurality of satellite positioning signals from, said plurality of GPS satellites based on said received SA information;
locating said second plurality of satellite positioning signals from said plurality of GPS satellites based on said deep search;
determining whether said first plurality of satellites positioning signals located by said shallow search and said second plurality of plurality of satellite positioning signals located by said deep search have enough satellite positioning signals to yield said acceptable geographic position fix for said wireless device; and
determining said geographic position fix for said wireless device based on said located first and second plurality of satellite positioning signals from said plurality of GPS satellites if said first and second plurality of satellites positioning signals do have enough satellite positioning signals to yield said acceptable geographic position fix for said wireless device.
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30. A method for messaging position-based information in an assisted wireless position determination system, the method comprising:
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obtaining coarse time estimating information, coarse position estimating information, and Global Positioning System (GPS) almanac information;
checking a status of a first ephemeris for a positioning satellite;
determining whether said status of said first ephemeris is less than a first time threshold;
determining whether said positioning satellite is above a viewable horizon of a wireless device if said status is not less than said first time threshold;
setting a mask to request a second ephemeris for said positioning satellite from a position determination entity (PDE) if said positioning satellite is above said viewable horizon of said wireless device and said status is not less than said first time threshold;
transmitting a request having said mask for said second ephemeris for said positioning satellite to said PDE if said positioning satellite is above said viewable horizon of said wireless device and said status is not less than said first time threshold;
receiving said requested second ephemeris for said positioning satellite from said PDE if said positioning satellite is above said viewable horizon of said wireless device and said status is not less than said first time threshold;
locating a satellite positioning signal from said positioning satellite based on said second ephemeris for said positioning satellite if said positioning satellite is above said viewable horizon of said wireless device and said status is not less than said first time threshold; and
determining said geographic position for said wireless device based on said located satellite positioning signal from said positioning satellite if said positioning satellite is above said viewable horizon of said wireless device and said status is not less than said first time threshold.
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31. A system for messaging position-based information in an assisted wireless position determination system, comprising:
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means for receiving first aiding information from a position determination entity (PDE) via a wireless communication link;
means for determining a redundant satellite positioning signal based on said received first aiding information;
means for transmitting a request for second aiding information based on said determined redundant satellite positioning signal to said PDE via said wireless communication link;
means for receiving said requested second aiding information from said PDE via said wireless communication link;
means for locating a necessary satellite positioning signal from a positioning satellite based on said received second aiding information; and
means for determining a geographic position based on said located satellite positioning signal.
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Specification