SYSTEM AND METHOD FOR DETERMINING A LOCATION AREA OF A MOBILE USER
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Accused Products
Abstract
A system and a method for determining a location area of a user using a mobile communication terminal in a geographical area covered by a mobile radio network, based on location probabilities for defined sub-areas of the geographical area. The location probabilities may be determined based on, e.g., field strengths expected in the sub-areas from antennas and based on the antenna used by the mobile communication terminal. The location probabilities may indicate, for a sub-area, the probability that the mobile communication terminal is located in the respective sub-area. At least one ellipse defining the location area may be determined, such as based on the location probabilities. The location probabilities may enable determining elliptical location areas of mobile users much smaller than the area each antenna does cover physically, but without the need for measuring at the mobile communication terminal signal properties such as signal strength or observed time differences.
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Citations
33 Claims
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1-13. -13. (canceled)
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14. A method, comprising:
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determining for a plurality of sub-areas of a geographical area, location probabilities, wherein each location probability indicates a probability that a mobile communication terminal is located in the respective sub-area, based on field strengths expected in the sub-areas for antennas located in the geographical area, and based on the antenna used by the mobile communication terminal; and determining at least one ellipse defining a location area of a user using the mobile communication terminal, based on; the location probabilities of the sub-areas, and a polygon enveloping probable sub-areas having at least a defined minimum location probability. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system, comprising:
one or more processor for use in determining a location area of a user using a mobile communication terminal in a geographical area covered by a mobile radio network, the one or more processors are operable to; determine for a plurality of sub-areas of a geographical area, location probabilities, wherein each location probability indicates a probability that the mobile communication terminal is located in the respective sub-area, based on field strengths expected in the sub-areas for antennas located in the geographical area, and based on the antenna used by the mobile communication terminal; and determine at least one ellipse defining the location area of the user using the mobile communication terminal, based on; the location probabilities of the sub-areas; and a polygon enveloping probable sub-areas having at least a defined minimum location probability. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification