Search area reduction based on indoor detection for estimating the location of a wireless terminal
First Claim
1. A method comprising:
- (a) receiving, by a location server, a measurement of a first characteristic of a first signal that is processed by a wireless terminal;
(b) estimating, by said location server, based at least in part on said received measurement of said first characteristic of said first signal, whether said wireless terminal is indoors or said wireless terminal is outdoors;
(c) based on a plurality of possible locations of said wireless terminal,(i) when said wireless terminal is estimated to be indoors, designating each possible location that is outdoors as improbable, and(ii) when said wireless terminal is estimated to be outdoors, designating each possible location that is indoors as improbable; and
(d) estimating, by said location server, a location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations, wherein said at least one of said plurality of possible locations is not designated as improbable.
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Accused Products
Abstract
A method of using a non-GPS-derived technique to estimate the location of an Assisted-GPS-enabled wireless terminal for the purposes of generating location-specific assistance data for the wireless terminal is disclosed. The wireless terminal then uses the assistance data to acquire and process one or more GPS signals and to derive information that is probative of the wireless terminal'"'"'s location. The GPS-derived location information is then combined with non-GPS-derived location to form an estimate of the location of the wireless terminal that is better than can be derived from either alone. This combination of GPS-derived and non-GPS techniques is particularly useful when the wireless terminal can only acquire one or two GPS signals because it is not possible to determine the location of the wireless terminal with only two GPS signals alone.
18 Citations
16 Claims
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1. A method comprising:
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(a) receiving, by a location server, a measurement of a first characteristic of a first signal that is processed by a wireless terminal; (b) estimating, by said location server, based at least in part on said received measurement of said first characteristic of said first signal, whether said wireless terminal is indoors or said wireless terminal is outdoors; (c) based on a plurality of possible locations of said wireless terminal, (i) when said wireless terminal is estimated to be indoors, designating each possible location that is outdoors as improbable, and (ii) when said wireless terminal is estimated to be outdoors, designating each possible location that is indoors as improbable; and (d) estimating, by said location server, a location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations, wherein said at least one of said plurality of possible locations is not designated as improbable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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(a) receiving, by a location server, a measurement of a first characteristic of a first signal that is processed by a wireless terminal; (b) receiving, by said location server, an indication of whether said wireless terminal is indoors or said wireless terminal is outdoors, wherein said indication is based, at least in part, on said measurement of said first characteristic of said first signal; (c) based on a plurality of possible locations of said wireless terminal, (i) when said indication is that said wireless terminal is indoors, designating each possible location that is outdoors as improbable, and (ii) when said indication is that said wireless terminal is outdoors, designating each possible location that is indoors as improbable; and (d) estimating, by said location server, a location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations, wherein said at least one of said plurality of possible locations is not designated as improbable. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification