| 摘要 |
In one embodiment, a method includes transmitting at a pre-determined polling frequency an activation signal waking from a sleep mode an application on a mobile device and causing the application to activate a location service of the mobile device for a pre-determined sampling duration. The pre-determined polling frequency and the pre-determined sampling duration are determined at least in part by a travel distance of the mobile device. The method also includes receiving location data from the mobile device after the pre-determined sampling duration. The location data is responsive to a transmission signal. |
