Radiolocation using path loss data
First Claim
1. A method comprising:
- accepting a radio loss model applicable to an area of interest;
accepting data indicative of path losses between pairs of wireless stations of a first set of wireless stations;
calibrating the path loss model using the accepted data to obtain a calibrated path loss model;
causing respective transmissions at known respective transmit powers from at least some of the stations of the set of wireless stations;
receiving measurements from a particular wireless station of unknown location, the measurements indicative of the received signal strengths at the particular wireless station resulting from the caused respective transmissions; and
determining the likely location or locations of the particular wireless station using the received measurements and the calibrated path loss model.
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Abstract
Determining the location of a station or potential rogue access point in a wireless network including accepting an ideal path loss model and calibrating the ideal model using path loss measurements between access points at known locations. The calibrating determines a calibrated path loss model between the access points. The method further includes determining path losses between the wireless station of unknown location and at least some of the access points. In the case the wireless station is a client station, the determining includes receiving measurements from the wireless station of unknown location measuring the received signal strengths as a result of respective transmissions from at least some of the access points at known respective transmit powers. In the case the wireless station is an potential rogue access point, the determining includes receiving measurements from at least some of the access points measuring the received signal strength at each of the access points resulting from transmission by the potential rogue access point for each of a set of assumed transmit powers for the potential rogue. The method further includes determining the likely location or locations of the wireless station using the measured path loss and the calibrated path loss model.
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Citations
25 Claims
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1. A method comprising:
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accepting a radio loss model applicable to an area of interest;
accepting data indicative of path losses between pairs of wireless stations of a first set of wireless stations;
calibrating the path loss model using the accepted data to obtain a calibrated path loss model;
causing respective transmissions at known respective transmit powers from at least some of the stations of the set of wireless stations;
receiving measurements from a particular wireless station of unknown location, the measurements indicative of the received signal strengths at the particular wireless station resulting from the caused respective transmissions; and
determining the likely location or locations of the particular wireless station using the received measurements and the calibrated path loss model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A carrier medium carrying instructions that when executed by one or more processors cause at least one of the processors to implement a method comprising:
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accepting a radio path loss model applicable to an area of interest;
calibrating the path loss model using measurements received from each respective wireless station of a first set of wireless stations of a wireless network measuring the received signal strengths at each of the respective wireless stations, the stations receiving signals as a result of transmissions by respective wireless stations of a second set of wireless stations of the wireless network, each respective transmission at a known respective transmit power, the locations of each station of the first and second set being known or determined, the calibrating being to determine a calibrated path loss model between the receiving and transmitting wireless stations;
receiving measurements from each respective station of a third set of wireless stations of the wireless network measuring the received signal strength at each of the respective stations resulting from transmission of a signal from a potential rogue access point, each station of the third set being at a known or determined location; and
for each of a set of assumed transmit powers for the potential rogue access point, determining the likely location or locations of the potential rogue access point using the received signal strengths at the stations of the third set and the calibrated path loss model. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A carrier medium carrying one or more code segments to instruct one or more processors of a processing system to execute a method comprising:
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accepting a radio path loss model applicable to an area of interest;
accepting data indicative of path losses between pairs of wireless stations of a first set of wireless stations, the data provided by measuring the path loss between pairs of the first set of wireless stations, the wireless stations being at known or determined locations in the area of interest;
calibrating the accepted path loss model using the accepted data to determine a calibrated path loss model between the receiving and transmitting wireless stations causing respective transmissions at known respective transmit powers from at least some of the stations of the first set of wireless stations;
receiving measurements from a particular wireless station of unknown location, the measurements indicative of the received signal strengths at the particular wireless station resulting from the caused-respective transmissions; and
determining the likely location or locations of the particular wireless station using the received measurements and the calibrated path loss model.
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21. An apparatus comprising:
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a processing system including a memory and a network interface to couple the apparatus to a network including a set of wireless stations of a wireless network at known or determined locations, the processing system to;
accept a radio path loss model applicable to an area of interest;
instruct each of the wireless stations at known or determined locations in the area of interest to measure and report the received signal strengths as a result of transmissions by respective other wireless stations of the set, each respective transmission at a known respective transmit power;
receive the reports of the measurements from the instructed wireless stations;
calibrate the path loss model to determine a calibrated path loss model between the receiving and transmitting wireless stations;
receive from a particular wireless station of unknown location the received signal strengths resulting from respective transmissions from at least some of the wireless stations in the area of interest, said each of the respective transmissions being at a known corresponding transmit power; and
determine the likely location or locations of the particular wireless station using the received signal strengths at the particular wireless station and the calibrated path loss model.
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22. A method comprising:
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accepting a radio path loss model;
calibrating the path loss model in an area of interest using path loss determined from measurements between wireless stations of a wireless network, the wireless stations at known locations, the measurements received from some of the wireless stations measuring their received signal strengths resulting from respective transmissions from respective wireless stations, each respective transmission at a known respective transmit power, the calibrating being to determine a calibrated path loss model between the wireless stations;
determining the measured path loss between a particular wireless station of unknown location and at least some of the wireless stations by receiving measurements from the particular wireless station, wherein in the case the wireless station of unknown location is known not to be a rogue access point, the determining uses measurements received from the particular wireless station of unknown location measuring the received signal strength as a result of respective transmissions from at least some of the wireless stations, said each respective transmissions being at a known respective transmit power, and wherein, in the case the wireless station of unknown location is a potential rogue access point, the determining uses measurements received from each of at least some of the wireless stations measuring the received signal strength at each of the wireless stations resulting from transmission of a signal from the potential rogue access point for each of a set of assumed transmit powers for the potential rogue access point; and
determining the likely location or locations of the particular wireless station of unknown location using the measured path loss and the calibrated path loss model.
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23. An apparatus comprising:
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means for accepting an path loss model applicable to an area of interest;
means for accepting data indicative of path losses between pairs of wireless stations of a first set of wireless stations;
means for calibrating the path loss model using the accepted data to obtain a calibrated path loss model;
means for causing respective transmissions at known respective transmit powers from at least some of the stations of the set of wireless stations;
means for receiving measurements from a particular wireless station of unknown location, the measurements indicative of the received signal strengths at the particular wireless station resulting from the caused respective transmissions; and
means for determining the likely location or locations of the particular wireless station using the received measurements and the calibrated path loss model. - View Dependent Claims (24, 25)
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Specification