Estimating altitude of a communications device
First Claim
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1. A method for estimating altitude of a communications device, comprising the step of:
- estimating a two-dimensional location estimate of the communications device based on signal measurements relating to at least two antennas of a communications system; and
estimating the altitude of the communications device based at least on altitudes of said at least two antennas of a communications system and on the two-dimensional location estimate of the communications device.
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Abstract
The altitude of a communications device, which communicates with a communications system via at least one antenna, is estimated. The altitude estimation is based at least on altitude information of said at least one antenna. The altitude estimate of the communications device may be based on a two-dimensional location estimate for the communications device and on information representing three-dimensional location of said at least one antenna of said communication system. The two-dimensional location estimate and the altitude estimate may be sent to the communications device as location assistance information.
13 Citations
37 Claims
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1. A method for estimating altitude of a communications device, comprising the step of:
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estimating a two-dimensional location estimate of the communications device based on signal measurements relating to at least two antennas of a communications system; and estimating the altitude of the communications device based at least on altitudes of said at least two antennas of a communications system and on the two-dimensional location estimate of the communications device. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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4. A method for estimating altitude of a communications device, comprising the step of:
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estimating a two-dimensional location estimate of the communications device based on signal measurements relating to at least two antennas of a communications system and based on identity information of at least two cells corresponding to said at least two antennas of said communications system; and estimating the altitude of the communications device based at least on altitudes of said at least two antennas of said communications system and on the two-dimensional location estimate of the communications device.
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18. A method for providing location assistance information to a communications device communicating with a communications system via at least two antennas of said communications system, said method comprising:
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estimating a two-dimensional location estimate of the communications device based on signal measurements relating to said at least two antennas of said communications system; estimating an altitude estimate of the communications device based at least on altitude information of said at least two antennas; and determining location assistance information based on the two-dimensional location estimate and the altitude estimate of the communications device. - View Dependent Claims (19, 20, 21, 22)
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23. A communications system, said communications system comprising:
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first estimation means for estimating a two-dimensional location estimate of a communications device based on signal measurements relating to at least two antennas of said communications system; storage means for storing antenna information representing at least altitudes of said at least two antennas of said communications system; and second estimation means for estimating an altitude of said communications device based at least on said altitudes of said at least two antennas of said communications system and on the two-dimensional location estimate of the communications device. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A network element for a communications system, said network element comprising:
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first estimation means for estimating a two-dimensional location estimate of a communications device based on signal measurements relating to at least two antennas of said communications system; first determination means for determining antenna information representing at least altitudes of said at least two antennas of said communications system; and second estimation means for estimating an altitude of the communications device based at least on said altitudes of said at least two antennas of said communications system and on said two-dimensional location estimate of the communications device. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A computer readable medium containing executable computer program instructions which, when executed by a data processing system, cause said data processing system to perform a method comprising
estimating a two-dimensional location estimate of the communications device based on signal measurements relating to at least two antennas of a communications system; - and
estimating an altitude of the communications device based at least on altitudes of said at least two antennas of a communications system and on the two-dimensional location estimate of the communications device.
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37. A method for providing location assistance information to a communications device communicating with a communications system, said method comprising:
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estimating a two-dimensional location estimate of the communications device based on signal measurements relating to at least two antennas of a communications system; estimating an altitude estimate of the communications device based at least on altitude information of said at least two antennas of the communications system and on the two-dimensional location estimate; and determining location assistance information based on the two-dimensional location estimate and the altitude estimate of the communications device.
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Specification