Location applications for wireless networks
First Claim
1. A method for locating several terminals in a wireless network comprising several base stations:
- the method comprising;
maintaining a probabilistic model of the wireless network, the probabilistic model indicating a probability distribution for signal values of several base stations at several locations in the wireless network;
for each of the several terminals;
the terminal making a set of observations of signal values of a subset of said several base stations;
determining an estimate of the terminal'"'"'s location based on the probabilistic model and the set of observations;
the terminal recurrently measuring at least one additional item, wherein the at least one additional item is not used for determining the estimate of the terminal'"'"'s location;
the method further comprising;
collecting information tuples, wherein each information tuple indicates the at least one additional item and the time and the estimate of the terminal'"'"'s location at which the at least one additional item was measured;
storing and organizing the information tuples;
using the stored information tuples to determine the at least one additional item as a function of time and location in the wireless networks,wherein the at least one additional item comprises throughput in the radio network and the step of measuring throughput comprises, in the following order;
the terminal discontinuing making the set of observations;
the terminal making a throughput measurement;
the terminal continuing making the set of observations; and
wherein, inversely weighting the throughput measurement by an estimated change of the terminal'"'"'s location between the discontinuing and continuing steps.
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Accused Products
Abstract
A method for locating terminals in a wireless network including several base stations. A probabilistic model of the wireless network indicates a probability distribution for signal values of several base stations at several locations in the wireless network. Each terminal makes a set of observations of signal values of a subset of the several base stations. The terminal'"'"'s location is estimated based on the probabilistic model (PM) and the set of observations. The terminal recurrently measures at least one additional item, which is not used for locating the terminal. Each information tuple indicates the additional items and the time and the location at which the additional items were measured. The information tuples are used to determine the additional item as a function of time and location in the wireless network.
41 Citations
14 Claims
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1. A method for locating several terminals in a wireless network comprising several base stations:
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the method comprising; maintaining a probabilistic model of the wireless network, the probabilistic model indicating a probability distribution for signal values of several base stations at several locations in the wireless network; for each of the several terminals; the terminal making a set of observations of signal values of a subset of said several base stations; determining an estimate of the terminal'"'"'s location based on the probabilistic model and the set of observations; the terminal recurrently measuring at least one additional item, wherein the at least one additional item is not used for determining the estimate of the terminal'"'"'s location; the method further comprising; collecting information tuples, wherein each information tuple indicates the at least one additional item and the time and the estimate of the terminal'"'"'s location at which the at least one additional item was measured; storing and organizing the information tuples; using the stored information tuples to determine the at least one additional item as a function of time and location in the wireless networks, wherein the at least one additional item comprises throughput in the radio network and the step of measuring throughput comprises, in the following order; the terminal discontinuing making the set of observations; the terminal making a throughput measurement; the terminal continuing making the set of observations; and wherein, inversely weighting the throughput measurement by an estimated change of the terminal'"'"'s location between the discontinuing and continuing steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. An arrangement for locating several terminals in a wireless network comprising several base stations;
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the arrangement comprising; a probabilistic model of the wireless network, the probabilistic model indicating a probability distribution for signal values of several base stations at several locations in the wireless network; a location calculation module for determining an estimate of each terminal'"'"'s location based on the probabilistic model and a set of observations made by the terminal in question, wherein the set of observations indicates signal values of a subset of said several base stations; control means for; receiving from each of the several terminals at least one additional measured item, wherein the at least one additional item is not used for determining the estimate of the terminal'"'"'s location; storing information tuples, wherein each information tuple indicates the at least one additional item and the time and the estimate of the terminal'"'"'s location at each the at least one additional item was measured; and
forusing the stored information tuples to determine the at least one additional item as a function of time and location in the wireless network, wherein the control means comprises a controller for coordinating measurements of several terminals, the at least one additional item comprises throughput in the radio network and the controller is operable to order a terminal to perform the following acts; discontinue of making the set of observations; perform a throughput measurement; continue making the set of observations; and the arrangement is operable to inversely weigh the throughput measurement by an estimated change of the terminal'"'"'s location between the discontinuing and continuing acts. - View Dependent Claims (12)
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13. An arrangement for locating several terminals in a wireless network comprising several base stations;
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the arrangement comprising; a probabilistic model of the wireless network, the probabilistic model indicating a probability distribution for signal values of several base stations at several locations in the wireless network; a location calculation module for determining an estimate of each terminal'"'"'s location based on the probabilistic model and a set of observations made by the terminal in question, wherein the set of observations indicates signal values of a subset of said several base stations; control means for; receiving from each of the several terminals at least one additional measured item, wherein the at least one additional item is not used for determining the estimate of the terminal'"'"'s location; storing information tuples, wherein each information tuple indicates the at least one additional item and the time and the estimate of the terminal'"'"'s location at each the at least one additional item was measured; and
forusing the stored information tuples to determine the at least one additional item as a function of time and location in the wireless network, wherein the arrangement further comprises multiple device models that compensate for the differences between different terminals'"'"' observations of the at least one signal quality value; and the arrangement is operable to select, for each terminal, a device model among the multiple device models, and to process the observations made by the terminal with the selected device model.
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Specification