Enabling a validation of an estimated position of a mobile device
First Claim
1. A method comprising, performed by at least one apparatus:
- obtaining results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement;
estimating a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations;
matching a distribution of characteristics of radio signals in the obtained results of measurements with a reference distribution of characteristics of radio signals; and
providing a result of the matching as an indication of validity of the estimated position.
1 Assignment
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Accused Products
Abstract
An apparatus obtains results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement. The apparatus estimates a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations. The apparatus matches a distribution of characteristics of radio signals in the obtained results of measurements with a reference distribution of characteristics of radio signals. Alternatively or in addition, the apparatus determines matching transmitters for which characteristics are available in the results of measurements and in the assistance data, and matches a determined expected distribution for the matching transmitters with a predetermined reference distribution. A result of any matching is provided as an indication of the validity of the estimated position.
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Citations
23 Claims
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1. A method comprising, performed by at least one apparatus:
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obtaining results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimating a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; matching a distribution of characteristics of radio signals in the obtained results of measurements with a reference distribution of characteristics of radio signals; and providing a result of the matching as an indication of validity of the estimated position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising, performed by at least one apparatus:
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obtaining results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimating a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; determining matching transmitters for which characteristics of radio signals are available in the results of measurements and for which information on expected characteristics of radio signals at the estimated position are available in the assistance data; determining a distribution of characteristics of radio signals of the matching transmitters at the estimated position based on the information on expected characteristics of radio signals of the matching transmitters in the assistance data to obtain an expected distribution for the matching transmitters; matching the determined expected distribution for the matching transmitters with a predetermined reference distribution of characteristics of radio signals; and providing a result of the matching as an indication of validity of the estimated position.
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11. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
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obtain results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimate a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; match a distribution of characteristics of radio signals in the obtained results of measurements with a reference distribution of characteristics of radio signals; and provide a result of the matching as an indication of validity of the estimated position. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
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obtain results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimate a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; determine matching transmitters for which characteristics of radio signals are available in the results of measurements and for which information on expected characteristics of radio signals at the estimated position are available in the assistance data; determine a distribution of characteristics of radio signals of the matching transmitters at the estimated position based on the information on expected characteristics of radio signals of the matching transmitters in the assistance data to obtain an expected distribution for the matching transmitters; match the determined expected distribution for the matching transmitters with a predetermined reference distribution of characteristics of radio signals; and provide a result of the matching as an indication of validity of the estimated position.
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22. A computer readable storage medium in which computer program code is stored, the computer program code causing an apparatus to perform the following when executed by a processor:
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obtain results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimate a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; match a distribution of characteristics of radio signals in the obtained results of measurements with a reference distribution of characteristics of radio signals; and provide a result of the matching as an indication of validity of the estimated position.
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23. A computer readable storage medium in which computer program code is stored, the computer program code causing an apparatus to perform the following when executed by a processor:
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obtain results of measurements by a mobile device on radio signals transmitted by a plurality of transmitters, the results of measurements comprising characteristics of the radio signals at the location of measurement; estimate a position of the mobile device based on the obtained results of measurements and based on assistance data including information on expected characteristics of radio signals of various transmitters at various locations; determine matching transmitters for which characteristics of radio signals are available in the results of measurements and for which information on expected characteristics of radio signals at the estimated position are available in the assistance data; determine a distribution of characteristics of radio signals of the matching transmitters at the estimated position based on the information on expected characteristics of radio signals of the matching transmitters in the assistance data to obtain an expected distribution for the matching transmitters; match the determined expected distribution for the matching transmitters with a predetermined reference distribution of characteristics of radio signals; and provide a result of the matching as an indication of validity of the estimated position.
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Specification