lMany sources of energy consumption exist in mobile nodes e.g. screens, HDD, interfaces, etc
lOur focus is energy consumed in wireless interfaces
lEnergy is consumed in sending, receiving, idle and sleep modes of operation
lIt is crucial for energy conservation that we eliminate or reduce wasted idle energy consumption which constitutes a large portion of energy consumption is wireless interfaces
lTo do this, ideally nodes need to be put to sleep when idle to save this wasted energy