Mobile location method for WLAN-type systems
First Claim
1. A method for providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network, characterized in that the estimate is based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map.
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Abstract
The present invention provides a new and unique method and apparatus for providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network, the estimate being based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map. The signal strength database or radio map is built using a signal strength fingerprint algorithm. The signal strength fingerprint algorithm includes selecting and measuring a set of grid points in the wireless local area network (WLAN) or other suitable network.
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Citations
35 Claims
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1. A method for providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network, characterized in that
the estimate is based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map.
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11. A wireless local area network (WLAN) or other suitable network having a network node, point or element with a module for providing an estimate of a mobile location of a wireless node, point or terminal therein, characterized in that
the estimate is based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map.
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21. A network node, point or element for operating in a wireless local area network (WLAN) or other suitable network, the network node, point or element having a module for providing an estimate of a mobile location of a wireless node, point or terminal in the wireless local area network (WLAN) or other suitable network, characterized in that
the estimate is based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map.
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31. A computer program product with a program code, which program code is stored on a machine readable carrier, for carrying out the steps of a method comprising one or more steps for providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network, the estimate being based on a correlation of a radio frequency (RF) signal strength measurement and a grid point in a signal strength database or radio map, when the computer program is run in a module of either a node, point or terminal, such as an Access Point (AP) or other suitable grid point, in the wireless local area network (WLAN) or other suitable network.
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33. A method for building a database using a signal strength fingerprint algorithm for use in providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network (WLAN) or other suitable network arranged in a geographic location, the method comprising the following steps:
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placing access points (APs) or other suitable grid points in the wireless local area network (WLAN) or other suitable network and recording their coordinates in the geographic location;
taking signal strengths measurements in areas of interest in the wireless local area network (WLAN) or other suitable network;
applying a linear regression method to estimate propagation channels;
estimating propagation channels at each access or other suitable grid point; and
/orprocessing the results to form the signal strength database or radio map. - View Dependent Claims (34, 35)
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Specification