 Therefore, the raw data concerning a certain phenomenon are often summarized in a few bits from each sensor.When inferring on a binary event (i.e., formula_1 or formula_2 ), in the extreme case only binary decisions are sent from sensors to a Decision Fusion Center (DFC) and combined in order to obtain improved classification performance.With a multitude of built-in sensors including motion sensor, environmental sensor, position sensor, a modern mobile device typically gives mobile applications access to a number of sensory data which could be leveraged to enhance the contextual awareness.