Patent ID: 9628951
Date: 2017-04-18
CPC Classifications: H04W,Y02D

Claim:
1. A method of implementing geofencing using a mobile device having a GPS capability, the mobile device configured to be operably coupled to a building controller, the method comprising: setting a geofence defining a region about a building; turning on the GPS capability of the mobile device, ascertaining an updated current location of the mobile device, and then turning off the GPS capability; determining a position of the mobile device relative to the geofence based on the updated current location; calculating a TIME TO FENCE value, wherein the TIME TO FENCE value is an estimate of a minimum length of time that it would take for an individual carrying the mobile device to cross the geofence; calculating a DELAY TIME value, where the DELAY TIME value is based at least in part on the calculated TIME TO FENCE value and is less than the TIME TO FENCE value; with the GPS capability turned off, waiting THE DELAY TIME value and then: repeating the determining the position, calculating the TIME TO FENCE value, calculating the DELAY TIME value, waiting the DELAY TIME value, turning on the GPS capability, ascertaining an updated current location, and turning off the GPS capability steps; and communicating an indication of the position of the mobile device relative to the geofence to a building controller so that the building controller can regulate operation of a building system in accordance with the indication of the position of the mobile device relative to the geofence.