It is highly desired to minimize power consumption, because battery power is one of the most critical resources for mobile devices. Significant energy of a mobile device battery is expended by the activated wireless interface embedded while it is not only in transmit/receive mode but also in idle mode. Therefore, it is energy efficient to turn the wireless interface off or in doze mode while it is not used. However, required energy and time for turning the wireless interface are not negligible. Most of recent works have been trying to enhance the hardware architecture or network/MAC protocols. In this paper, we present an energy efficient policy that turns on the wireless interface only when predefined threshold is exceeded and transmits all awaited data. We propose two kinds of threshold - deadline and sending data queue size. For the practical evaluation, we conduct not only simulations but also experimental measurements by implementing on a real test bed.