Energy-efficient location determination

摘要

A location management system identifies points of interest that may be of interest to one or more users. The location management system defines a geofence boundary encompassing a particular point of interest. When the location management system determines that the user device is inside the geofence boundary - but not, for example, when the location management system determines that the user determines that the user device is outside the geofence boundary - the location management system instructs the user device to determine wireless signals available to the user device. The location management system then receives wireless signal data from the user device for available wireless signals. By matching the received wireless signal data to known wireless signals available at the identified points of interest, the location management system determines that the user device (and hence the user) is at the point of interest.