Determination of differential forward link calibration in LTE networks for positioning
First Claim
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1. A method of using signal times of arrival measurements from a plurality of mobile devices, the method comprising at a location server:
- receiving from each mobile device of the plurality of mobile devices an estimated location of the mobile device, wherein the estimated location is based, at least in part, upon Satellite Positioning System (SPS) signals received by the mobile device from SPS satellites;
receiving from said each mobile device of the plurality of mobile devices a determined difference between times of arrival of a first reference signal from a first base station and a second reference signal from a second base station, wherein the determined difference between times of arrival is as determined by said each mobile device, and wherein the first and second base stations are part of a Long Term Evolution (LTE) network;
determining a plurality of transmission time offsets by determining, for each of said mobile device of the plurality of mobile devices, a transmission time offset of signals from the first and second base stations based, at least in part, upon a first distance and upon a second distance and upon the determined difference between times of arrival,wherein the first distance is a distance between an estimated location of the first base station and the estimated location of said each mobile device of the plurality of mobile devices, andwherein the second distance is a distance between an estimated location of the second base station and the estimated location of said each mobile device of the plurality of mobile devices;
combining the plurality of transmission time offsets to determine an adjusted transmission time offset; and
determining an estimated location of a second mobile device based, at least in part, upon a second determined difference between times of arrival at the second mobile device of a third reference signal from the first base station and a fourth reference signal from the second base station and upon the adjusted transmission time offset,wherein the second mobile device is not any one of the plurality of mobile devices.
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Abstract
Techniques are provided which may be implemented using various methods and/or apparatuses to determine time difference of arrival of signals from two base stations as received at a mobile device, to use the time difference of arrival to determine differential forward link calibration for at least two base stations, and also to determine location using the differential forward link calibration for at least two base stations, determined using the time difference of arrival of signals from at least two base stations as received by a mobile device.
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Citations
26 Claims
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1. A method of using signal times of arrival measurements from a plurality of mobile devices, the method comprising at a location server:
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receiving from each mobile device of the plurality of mobile devices an estimated location of the mobile device, wherein the estimated location is based, at least in part, upon Satellite Positioning System (SPS) signals received by the mobile device from SPS satellites; receiving from said each mobile device of the plurality of mobile devices a determined difference between times of arrival of a first reference signal from a first base station and a second reference signal from a second base station, wherein the determined difference between times of arrival is as determined by said each mobile device, and wherein the first and second base stations are part of a Long Term Evolution (LTE) network; determining a plurality of transmission time offsets by determining, for each of said mobile device of the plurality of mobile devices, a transmission time offset of signals from the first and second base stations based, at least in part, upon a first distance and upon a second distance and upon the determined difference between times of arrival, wherein the first distance is a distance between an estimated location of the first base station and the estimated location of said each mobile device of the plurality of mobile devices, and wherein the second distance is a distance between an estimated location of the second base station and the estimated location of said each mobile device of the plurality of mobile devices; combining the plurality of transmission time offsets to determine an adjusted transmission time offset; and determining an estimated location of a second mobile device based, at least in part, upon a second determined difference between times of arrival at the second mobile device of a third reference signal from the first base station and a fourth reference signal from the second base station and upon the adjusted transmission time offset, wherein the second mobile device is not any one of the plurality of mobile devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A location server configured for communicating with a plurality of mobile devices via a communication network, the location server comprising:
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a network interface to transmit messages to and receive messages from the communication network; and one or more processors configured to; obtain from each mobile device of the plurality of mobile devices an estimated location of the mobile device, wherein the estimated location is based, at least in part, upon Satellite Positioning System (SPS) signals received by the mobile device from SPS satellites; obtain from said each mobile device of the plurality of mobile devices a determined difference between times of arrival of a first reference signal from a first base station and a second reference signal from a second base station based, at least in part, on a measured time of arrival of the first reference signal and a measured time of arrival of the second reference signal, wherein the first and second base stations are part of a Long Term Evolution (LTE) network; determine a plurality of transmission time offsets by determining, for each of said mobile device of the plurality of mobile devices, a transmission time offset of signals from the first and second base stations based, at least in part, upon a first distance and upon a second distance and upon the determined difference between times of arrival, wherein the first distance is a distance between an estimated location of the first base station and the estimated location of said each mobile device of the plurality of mobile devices, and wherein the second distance is a distance between an estimated location of the second base station and the estimated location of said each mobile device of the plurality of mobile devices; combine the plurality of transmission time offsets to determine an adjusted transmission time offset, and determine an estimated location of a second mobile device based, at least in part, upon a second determined difference between times of arrival at the second mobile device of a third reference signal from the first base station and a fourth reference signal from the second base station and upon the adjusted transmission time offset, wherein the second mobile device is not any one of the plurality of mobile devices. - View Dependent Claims (10, 11, 12, 13)
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14. A non-transitory storage medium comprising machine-readable code stored thereon which is executable by a location server configured for communicating with a plurality of mobile devices via a communication network, the code comprising:
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code to obtain from each mobile device of the plurality of mobile devices an estimated location of the mobile device, wherein the estimated location is based, at least in part, upon Satellite Positioning System (SPS) signals received by the mobile device from SPS satellites; code to obtain from said each mobile device of the plurality of mobile devices a determined difference between times of arrival of a first reference signal from a first base station and a second reference signal from a second base station based, at least in part, on a measured time of arrival of the first reference signal and a measured time of arrival of the second reference signal, wherein the first and second base stations are part of a Long Term Evolution (LTE) network; code to determine a plurality of transmission time offsets by determining, for each of said mobile device of the plurality of mobile devices, a transmission time offset of signals from the first and second base stations based, at least in part, upon a first distance and upon a second distance and upon the determined difference between times of arrival, wherein the first distance is a distance between an estimated location of the first base station and the estimated location of said each mobile device of the plurality of mobile devices, and wherein the second distance is a distance between an estimated location of the second base station and the estimated location of said each mobile device of the plurality of mobile devices; code to combine the plurality of transmission time offsets to determine an adjusted transmission time offset; and code to determine an estimated location of a second mobile device based, at least in part, upon a second determined difference between times of arrival at the second mobile device of a third reference signal from the first base station and a fourth reference signal from the second base station and upon the adjusted transmission time offset, wherein the second mobile device is not any one of the plurality of mobile devices. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus at a location server configured for communicating with a plurality of mobile devices via a communication network, the apparatus, comprising:
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means for receiving from each mobile device of the plurality of mobile devices an estimated location of the mobile device, wherein the estimated location is based, at least in part, upon Satellite Positioning System (SPS) signals received by the mobile device from SPS satellites; means for receiving from said each mobile device of the plurality of mobile devices a determined difference between times of arrival of a first reference signal from a first base station and a second reference signal from a second base station, wherein the determined difference between times of arrival is as determined by said each mobile device, and wherein the first and second base stations are part of a Long Term Evolution (LTE) network; means for determining a plurality of transmission time offsets by determining, for each of said mobile device of the plurality of mobile devices, a transmission time offset of signals from the first and second base stations based, at least in part, upon a first distance and upon a second distance and upon the determined difference between times of arrival, wherein the first distance is a distance between an estimated location of the first base station and the estimated location of said each mobile device of the plurality of mobile devices, and wherein the second distance is a distance between an estimated location of the second base station and the estimated location of said each mobile device of the plurality of mobile devices; means for combining the plurality of transmission time offsets to determine an adjusted transmission time offset; and means for determining an estimated location of a second mobile device based, at least in part, upon a second determined difference between times of arrival at the second mobile device of a third reference signal from the first base station and a fourth reference signal from the second base station and upon the adjusted transmission time offset, wherein the second mobile device is not any one of the plurality of mobile devices. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification