Power optimized geolocation
An object tracking device, such as may be attached to a trailer to track movements of the trailer, may have various communication capabilities, such as cellular/LTE, Wi-Fi and GPS, which each have varying power requirements. A power optimization routine determines which communications should be performed to conserve battery while also providing frequent location updates. The routine determines if another plugged in tracking device is within low power Bluetooth (BLE) range and, if so, communications location via that device. If not, a Wi-Fi scan is performed and a lookup table is consulted for the corresponding location of any identified Wi-Fi access points. If location data cannot be found for an identified Wi-Fi access point, GPS location of the device is determined and the lookup table is updated to include the GPS location of the Wi-Fi access point.
1. A battery powered object tracking device comprising:
a GPS receiver configured to detect GPS signals from GPS satellites;
a Wi-Fi transceiver configured to wirelessly communicate with Wi-Fi access points;
a short-range communication transceiver configured to wirelessly communicate via a short-range communication protocol;
a computer readable storage medium having program instructions embodied therein; and
one or more processors configured to execute the program instructions to cause the object tracking device to:
perform, by the short-range communication transceiver, a scan for one or more location aware devices configured to determine geographic locations of respective devices;
in response to establishing communication with a first location aware device, initiate transmission to a backend server, by the first location aware device, of a current geographic location of the first location aware device with an indication that the object tracking device is nearby, wherein the object tracking device preserves battery power by not activating the Wi-Fi transceiver or the GPS receiver;
in response to failing to identify a location aware device, perform, using the Wi-Fi transceiver, a Wi-Fi access point scan;
in response to establishing communication with a first Wi-Fi access point, initiate transmission to a backend server, of an identifier of the first Wi-Fi access point, wherein the backend server is configured to lookup the identifier in a database of Wi-Fi access point identifiers and associated geographic locations; and
in response to failing to identify a location aware device, failing to identify a Wi-Fi access point, and determining that a geographic location of the object tracking device has not been provided to the backend server for more than a threshold amount of time, activate the GPS receiver and determine a geolocation based on detected GPS signals by the GPS receiver of the object tracking device and transmit the geolocation to the backend server.
2. The object tracking device of claim 1 , wherein an amount of power required by the GPS receiver is greater than an amount of power required by the Wi-Fi transceiver, which is greater than an amount of power required by the short-range communication transceiver.
3. The object tracking device of claim 1 , wherein the short-range communication transceiver is configured to wirelessly communicate via Bluetooth.
4. The object tracking device of claim 1 , wherein the location aware device is a vehicle gateway.
5. The object tracking device of claim 1 , further comprising:
a cellular transceiver configured to wirelessly communication with cellular base stations,
wherein the computer readable storage medium further has instructions embodied therein that, when executed by the one or more processors, cause the object tracking device to:
in response to failing to identify a location aware device, failing to identify a Wi-Fi access point, and failing to determine a geolocation based on detected GPS signals, determine an approximate location based on one or more cellular base stations within a communication range of the object tracking device and transmit the approximate location to the backend server.
6. The object tracking device of claim 1 , wherein the computer readable storage medium further has instructions embodied therein that, when executed by the one or more processors, cause the object tracking device to determine if a location reporting condition is satisfied.
7. The object tracking device of claim 6 , wherein the location reporting condition comprises any combination of one or more of: a threshold amount of movement since a last reported location, a time since the last reported location, a time since a last connection to a cloud server, and a time since a last connection to a location aware device.
8. The object tracking device of claim 6 , wherein to determine if the location reporting condition is satisfied, the computer readable storage medium further has instructions embodied therein that, when executed by the one or more processors, cause the object tracking device to:
determine that the object tracking device has not experienced more than a threshold amount of movement since the location of the object tracking device was last reported;
determine that the object tracking device has determined a GPS location in a first threshold amount of time; and
determine that the object tracking device was not connected to a plugged in tracking device in a second threshold amount of time.
9. The object tracking device of claim 8 , wherein the first threshold amount of time is 48 hours.
10. The object tracking device of claim 1 , wherein the object tracking device is further configured to report an identifier of at least one unknown Wi-Fi access point.
11. The object tracking device of claim 1 , wherein the database of Wi-Fi access point identifiers and associated geographic locations includes at least one field indicative of entities associated with the Wi-Fi access point identifiers, and wherein looking up the identifier fails if an entity associated with the object tracking device is not associated with the Wi-Fi access point.
12. A computerized method, performed by a battery-powered object tracking device having one or more hardware computer processors and one or more non-transitory computer readable storage device storing software instructions executable by the object tracking device to perform the computerized method comprising:
performing, by a short-range communication transceiver, a scan for one or more location aware devices configured to determine geographic locations of respective devices;
in response to establishing communication with a first location aware device, initiating transmission to a backend server, by the first location aware device, of a current geographic location of the first location aware device with an indication that the object tracking device is nearby, wherein the object tracking device preserves battery power by not activating a Wi-Fi transceiver or a GPS receiver of the object tracking device;
in response to failing to identify a location aware device, performing, using the Wi-Fi transceiver, a Wi-Fi access point scan;
in response to establishing communication with a first Wi-Fi access point, initiate transmission to a backend server, of an identifier of the first Wi-Fi access point, wherein the backend server is configured to lookup the identifier in a database of Wi-Fi access point identifiers and associated geographic locations; and
in response to failing to identify a location aware device, failing to identify a Wi-Fi access point, and determining that a geographic location of the object tracking device has not been provided to the backend server for more than a threshold amount of time, activating the GPS receiver and determining a geolocation based on detected GPS signals by the GPS receiver of the object tracking device and transmit the geolocation to the backend server.
13. The computerized method of claim 12 , wherein an amount power required by the GPS receiver is greater than an amount of power required by the Wi-Fi transceiver, which is greater than an amount of power required by the short-range communication transceiver.
14. The computerized method of claim 12 , wherein the short-range communication transceiver is configured to wirelessly communicate via Bluetooth.
15. The computerized method of claim 12 , wherein the location aware device is a vehicle gateway.
16. The computerized method of claim 12 , further comprising:
in response to failing to identify a location aware device, failing to identify a Wi-Fi access point, and failing to determine a geolocation based on detected GPS signals, determining an approximate location based on one or more cellular base stations within a communication range of the object tracking device and transmit the approximate location to the backend server.
17. The computerized method of claim 12 , further comprising:
determining if a location reporting condition is satisfied.
18. The computerized method of claim 17 , wherein the location reporting condition comprises any combination of one or more of: a threshold amount of movement since a last reported location, a time since the last reported location, a time since a last connection to a cloud server, and a time since a last connection to a location aware device.
19. The computerized method of claim 17 , wherein to determine if the location reporting condition is satisfied, the method further comprises:
determining that the object tracking device has not experienced more than a threshold amount of movement since the location of the object tracking device was last reported;
determining that the object tracking device has determined a GPS location in a first threshold amount of time; and
determine that the object tracking device was not connected to a plugged in tracking device in a second threshold amount of time.