Method and apparatus for ascertaining a location of a personal portable wireless communication device
First Claim
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1. A method comprising:
- sensing, using a plurality of movement sensors on a personal portable wireless communication device, movement of the personal portable wireless communication device;
measuring, by the personal portable wireless communication device, wireless network signal strengths; and
ascertaining, by a controller, a location of the personal portable wireless communication device based on the sensed movement of the personal portable wireless communication device and the measured wireless network signal strengths through Bayesian filtering, the ascertaining including identifying a region within which the personal portable wireless communication device may be located based on sensed movement measurements and uncertainties of the plurality of movement sensors, and assigning weights to a set of locations within the region, wherein the weights are based on a probability of measuring wireless network signal strength values at the locations within the region, and wherein the probability of measuring the wireless network signal strength values at the locations within the region is calculated by;
calculating probabilities of measuring each individual wireless network signal strength value at the locations within the region so as to ascertain the location of the personal portable wireless communication device and calculating probabilities of measuring each wireless network signal strength value at the locations within the region by performing an interpolation of means and variances of a plurality of nearest neighbors.
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Abstract
A method and apparatus can ascertain a location of a personal portable wireless communication device. Movement of the personal portable wireless communication device can be sensed using a plurality of movement sensors on the personal portable wireless communication device. Wireless network signal strengths can be measured by the personal portable wireless communication device. A location of the personal portable wireless communication device can be ascertained based on the sensed movement of the personal portable wireless communication device and the measured wireless network signal strengths through Bayesian filtering.
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Citations
21 Claims
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1. A method comprising:
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sensing, using a plurality of movement sensors on a personal portable wireless communication device, movement of the personal portable wireless communication device; measuring, by the personal portable wireless communication device, wireless network signal strengths; and ascertaining, by a controller, a location of the personal portable wireless communication device based on the sensed movement of the personal portable wireless communication device and the measured wireless network signal strengths through Bayesian filtering, the ascertaining including identifying a region within which the personal portable wireless communication device may be located based on sensed movement measurements and uncertainties of the plurality of movement sensors, and assigning weights to a set of locations within the region, wherein the weights are based on a probability of measuring wireless network signal strength values at the locations within the region, and wherein the probability of measuring the wireless network signal strength values at the locations within the region is calculated by;
calculating probabilities of measuring each individual wireless network signal strength value at the locations within the region so as to ascertain the location of the personal portable wireless communication device and calculating probabilities of measuring each wireless network signal strength value at the locations within the region by performing an interpolation of means and variances of a plurality of nearest neighbors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A personal portable wireless communication device comprising:
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a plurality of movement sensors located on the personal portable wireless communication device; a transceiver configured to communicate with a wireless network; and a controller coupled to the plurality of movement sensors and coupled to the transceiver, the controller configured to sense, using the plurality of movement sensors, movement of the personal portable wireless communication device, configured to measure wireless network signal strengths of the wireless network received via the transceiver, and configured to ascertain a location of the personal portable wireless communication device based on the sensed movement of the personal portable wireless communication device and the measured wireless network signal strengths through Bayesian filtering by identifying a region within which the personal portable wireless communication device may be located based on sensed movement measurements and uncertainties of the plurality of movement sensors, and to assign weights to a set of locations within the region, wherein the weights are based on a probability of measuring wireless network signal strength values at the locations within the region, and wherein the probability of measuring the wireless network signal strength values at the locations within the region is calculated by;
calculating probabilities of measuring each individual wireless network signal strength value at the locations within the region so as to ascertain the location of the personal portable wireless communication device and calculating probabilities of measuring each wireless network signal strength value at the locations within the region by performing an interpolation of means and variances of a plurality of nearest neighbors. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method comprising:
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sensing, using a plurality of movement sensors on a personal portable wireless communication device, movement of the personal portable wireless communication device; measuring, by the personal portable wireless communication device, wireless network signal strengths; identifying a region within which the personal portable wireless communication device may be located based on sensed movement measurements and based on uncertainties of the plurality of movement sensors; assigning weights to a set of locations within the region, where the weights are based on a probability of measuring wireless network signal strength values at the locations within the region; and ascertaining a location of the personal portable wireless communication device based on probabilities of measuring each wireless network signal strength value within the region that are calculated by;
calculating probabilities of measuring the wireless network signal strength values at locations within the region by performing an interpolation of means and variances of a plurality of nearest neighbors. - View Dependent Claims (20, 21)
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Specification