Systems and methods for mobile terminal location determination using radio signal parameter measurements
First Claim
Patent Images
1. A method of obtaining a subset of radio signal parameters for transmission to a processor for use in a location calculation, the method comprising:
- obtaining a first set of radio signal parameter measurements at a first time in a first measurement cycle;
storing the first set of radio parameter measurements and the first time in an accumulator;
obtaining a second set of radio signal parameter measurements at a second time in a second measurement cycle, wherein the difference between the first time and the second time is based on a configurable rate;
storing the second set of radio signal parameter measurements and the second time in the accumulator;
calculating a value associated with each radio parameter measurement stored in the accumulator, wherein each value indicates the relative value for performing a location calculation, and wherein each value for a radio signal parameter measurement from the first or second measurement cycle is based on the relative age of the respective measurement;
selecting one or more radio signal parameter measurements stored in the accumulator based on the one or more associated values to obtain a subset of radio signal parameter measurements, wherein at least one radio signal parameter measurement from the first set and at least one radio signal parameter measurement from the second set are selected; and
storing the subset of radio signal parameter measurements for subsequent transmission to a processor for use in the location calculation.
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Abstract
A method and system for calculating the location of a mobile radio terminal in a radio communications network. The method provides for the collection of measurements of radio signal parameters at the mobile radio terminal which are then processed and transmitted to a network processor for calculating the location of the mobile radio terminal. The collected measurements may be filtered and subsets of the measurements may also be selected according to their suitability for particular applications.
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Citations
30 Claims
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1. A method of obtaining a subset of radio signal parameters for transmission to a processor for use in a location calculation, the method comprising:
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obtaining a first set of radio signal parameter measurements at a first time in a first measurement cycle; storing the first set of radio parameter measurements and the first time in an accumulator; obtaining a second set of radio signal parameter measurements at a second time in a second measurement cycle, wherein the difference between the first time and the second time is based on a configurable rate; storing the second set of radio signal parameter measurements and the second time in the accumulator; calculating a value associated with each radio parameter measurement stored in the accumulator, wherein each value indicates the relative value for performing a location calculation, and wherein each value for a radio signal parameter measurement from the first or second measurement cycle is based on the relative age of the respective measurement; selecting one or more radio signal parameter measurements stored in the accumulator based on the one or more associated values to obtain a subset of radio signal parameter measurements, wherein at least one radio signal parameter measurement from the first set and at least one radio signal parameter measurement from the second set are selected; and storing the subset of radio signal parameter measurements for subsequent transmission to a processor for use in the location calculation. - 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)
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26. A method for calculating a location of a mobile radio terminal in a radio communications network the method comprising:
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receiving a subset of radio signal parameter measurements obtained at a mobile radio terminal, the radio signal parameter measurements comprising respective indications of ambiguity, the subset including at least a first particular radio signal measurement corresponding to a first indication of ambiguity and a second particular radio signal measurement corresponding to a second indication of ambiguity, the second indication of ambiguity being indicative of a greater level of ambiguity than the first indication of ambiguity; processing with a processor the subset to calculate a first estimated location of the mobile radio terminal based on a first particular radio signal parameter measurement corresponding to a first indication of ambiguity; resolving an ambiguity of the second particular radio signal parameter measurement corresponding to the second indication of ambiguity based on the first estimated location; and processing with the processor the subset to calculate a second estimated location of the mobile radio terminal based on the first particular radio signal parameter measurement and the second particular radio signal parameter measurement. - View Dependent Claims (27, 28, 29)
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30. A method of obtaining a subset of radio signal parameters for transmission to a processor for use in a location calculation, the method comprising:
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obtaining a first set of radio signal parameter measurements at a first time in a first measurement cycle; storing the first set of radio parameter measurements and the first time in an accumulator; obtaining a second set of radio signal parameter measurements at a second time in a second measurement cycle; storing the second set of radio signal parameter measurements and the second time in the accumulator; assigning a plurality of representations of ambiguity to the radio parameter measurements stored in the accumulator; calculating a value associated with each radio parameter measurement stored in the accumulator, wherein each value is relative to performing a location calculation, and wherein each value for a radio signal parameter measurement from the first or second measurement cycle is based in part on the first or second time; selecting one or more radio signal parameter measurements stored in the accumulator based on the one or more associated values to obtain a subset of radio signal parameter measurements, wherein at least one radio signal parameter measurement from the first set and at least one radio signal parameter measurement from the second set are selected; and storing the subset of radio signal parameter measurements; transmitting the subset to a processor for use in the location calculation, wherein the processor is configured to estimate a location based on at least a first measurement corresponding to a first representation of ambiguity and resolving an ambiguity of at least a second measurement corresponding to a second representation of ambiguity more ambiguous than the first representation of ambiguity based on the estimated location and to update the estimated location based on the at least the second measurement as resolved.
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Specification