Patent ID: 8195251
Filing Date: 2012-06-05
Classification: H04W,Y02D

Abstract:
1. A method performed by a mobile device, the method comprising: obtaining from a cellular radio subsystem incorporated in the mobile device cellular signal strength measurements taken at different times during a period of time, and comparing the cellular signal strength measurements to one another to determine whether there is an increasing trend in the cellular signal strength measurements over the period of time; obtaining from a wireless local area network (WLAN) radio subsystem incorporated in the mobile device WLAN signal strength measurements taken at different times during the period of time, and comparing the WLAN signal strength measurements to one another to determine whether there is a decreasing trend in the WLAN signal strength measurements over the period of time; and where there is the increasing trend in the cellular signal strength measurements and the decreasing trend in the WLAN signal strength measurements, concluding that an indoor-to-outdoor transition of the mobile device has occurred and, consequently, decreasing a background scanning frequency of the WLAN radio subsystem.