Determining location based on dynamic path loss exponent (ple) and intercept (int) estimation
AssigneeJuniper Networks, Inc.
InventorsMohammad Zohoorian, Robert D. Berry
Life of this patent
Estimating the term…
Abstract
Methods of deriving location information of a wireless device include deriving, in the continuous domain, a location of a wireless device and at least one time and location varying path loss function parameter. The coordinates and parameter are derived based on signal strength measurements made at the wireless device, with the measured signals originating from a plurality of wireless transmitters, such as access points. The derived path loss function parameter can include one or more of a path loss exponent parameter, an intercept parameter, a receiver antenna gain parameter, transmitter antenna gain parameter, or a transmit power parameter.
Claims20
A method, comprising:
- obtaining, by one or more processors of a location determination server, a signal strength measurement for each of a plurality of wireless signals received by a wireless device from a corresponding plurality of wireless transmitters;
- generating, by the one or more processors, for each of the signal strength measurements, a probability distribution function indicative of a probability that the wireless device is in a location, the probability distribution function including an unknown path loss function parameter that varies based on the location of the wireless device;
- deriving, by the one or more processors and based on the probability distribution functions generated for each of the signal strength measurements, the location of the wireless device;
- and
- generating an output indicating the location of the wireless device.
A system, comprising:
- one or more processors;
- one or more memories storing a signal strength measurement for each of a plurality of wireless signals received by a wireless device from a corresponding plurality of wireless transmitters and a known location for each of the plurality of wireless transmitters;
- the one or more memories further storing instructions that when executed configure the one or more processors to:
- generate, for each of the signal strength measurements, a probability distribution function indicative of a probability that the wireless device is in a location, the probability distribution function including an unknown path loss function parameter that varies based on the location of the wireless device;
- derive, based on the probability distribution functions generated for each of the signal strength measurements, and further based on known locations of the plurality of wireless transmitters, the location of the wireless device;
- and
- generate an output indicating the location of the wireless device.
A non-transitory computer-readable storage medium comprising instructions that, when executed, configure processing circuitry to:
- obtain a signal strength measurement for each of a plurality of wireless signals received by a wireless device from a corresponding plurality of wireless transmitters;
- generate, for each of the signal strength measurements, a probability distribution function indicative of a probability that the wireless device is in a location, the probability distribution function including an unknown path loss function parameter that varies based on the location of the wireless device;
- deriving, based on the probability distribution functions generated for each of the signal strength measurements, and further based on known locations of the plurality of wireless transmitters, the location of the wireless device;
- and
- generate an output indicating the location of the wireless device.
Dependencies are inferred from the claim text.