Distributed method and system for determining the position of a mobile device using long-range signals and calibrating the position using short-range signals
First Claim
1. A non-transitory machine readable medium storing a program for determining a location of a mobile device comprising a plurality of radios, each radio in the plurality of radios using a different communication protocol, the program executable by at least one processing unit of the mobile device, the program comprising sets of instructions for:
- receiving a plurality of signals through each radio, signals received at each radio of the mobile device corresponding to a different communication protocol than the signals received at other radios of the plurality of the mobile device radios;
determining a location of the mobile device from the plurality of signals received through each radio using a positioning method corresponding to each radio, the positioning method corresponding to each radio different than the positioning methods corresponding to other radios in the plurality of radios;
setting the location of the mobile device to a computed weighted sum of the determined locations;
receiving positioning assistance data from a short-range position reference device, wherein a set of radios in the plurality of radios of the mobile device utilize long-range communication protocols, wherein the mobile device and the short-range position reference device communicate using a short-range communication protocol that has a shorter range than the ranges of said long-range communication protocols, the positioning assistance data comprising a location of the short-range position reference device; and
calibrating each positioning method such that the location determined by the method is a same as the location received from the short-range position reference device.
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Accused Products
Abstract
A method and system is described where a plurality of position reference devices use short-range wireless communication protocols to transmit positioning assistance data to nearby mobile devices, and the mobile devices use the assistance data to model errors and re-calibrate their positioning systems. The short-range communication methods include NFC, RFID, Bluetooth®, short-range 802.11, Wi-Fi Direct, and high frequency focused beams such as 60 GHz. The position reference devices are passive or active NFC tags, passive or active RFID tags, other devices that include such tags as their components, Bluetooth®-enabled devices, 60 GHz-enabled devices, and 802.11 access points that can lower their transmit power. The reference devices are located at various indoor and outdoor locations such as smart posters, kiosks, ATM machines, malls, store checkout counters, store security gates, wireless access points, cellular base-stations, tollbooths, traffic lights, and street lamp posts.
92 Citations
18 Claims
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1. A non-transitory machine readable medium storing a program for determining a location of a mobile device comprising a plurality of radios, each radio in the plurality of radios using a different communication protocol, the program executable by at least one processing unit of the mobile device, the program comprising sets of instructions for:
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receiving a plurality of signals through each radio, signals received at each radio of the mobile device corresponding to a different communication protocol than the signals received at other radios of the plurality of the mobile device radios; determining a location of the mobile device from the plurality of signals received through each radio using a positioning method corresponding to each radio, the positioning method corresponding to each radio different than the positioning methods corresponding to other radios in the plurality of radios; setting the location of the mobile device to a computed weighted sum of the determined locations; receiving positioning assistance data from a short-range position reference device, wherein a set of radios in the plurality of radios of the mobile device utilize long-range communication protocols, wherein the mobile device and the short-range position reference device communicate using a short-range communication protocol that has a shorter range than the ranges of said long-range communication protocols, the positioning assistance data comprising a location of the short-range position reference device; and calibrating each positioning method such that the location determined by the method is a same as the location received from the short-range position reference device. - View Dependent Claims (2, 3, 4)
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5. A non-transitory machine readable medium storing a program for determining a location of a mobile device comprising a plurality of radios, the program executable by at least one processing unit of the mobile device, the program comprising sets of instructions for:
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receiving a plurality of signals through each radio, each radio in the plurality of radios using a different communication protocol; determining a location of the mobile device from the plurality of signals received through each radio using a positioning method corresponding to each radio; setting the location of the mobile device to a computed weighted sum of the determined locations; receiving positioning assistance data from a short-range position reference device, the positioning assistance data comprising a location of the position reference device; calibrating each positioning method such that the location determined by the method is a same as the location received from the position reference device; and iteratively waiting for a predetermined amount of time and performing said receiving of a plurality of signals, said determining, and said setting until further positioning assistance data from a position reference device is received.
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6. A method of determining a position of a mobile device using long-range signals and calibrating a positioning model of the mobile device using short-range signals, the method comprising:
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receiving a plurality of signals from a plurality of transmitting devices; setting the position of the mobile device to a position calculated based on the received signals and a positioning model; receiving positioning assistance data from a position reference device, the positioning assistance data comprising a position of the position reference device, wherein the position reference device utilizes a first transmission power level for transmitting positioning assistance data and a second transmission power level for transmitting data other than positioning assistance data, wherein the first transmission power level is less than the second transmission power level; setting the position of the mobile device from said calculated position to the position of the position reference device received in the positioning assistance data; and calibrating the positioning model such that the calculated position of the mobile device coincides with the received position of the position reference device. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification