Dynamic Power Management Strategies

M o b ile term ina ls su ch a s cellu la r p h o nes, sm a rt p h o nes a nd P D A s req u ire w ireless c o nnectio n to ex ch a ng e info rm a tio n w ith th e ex terna l w o rld . In th is tu to ria l w e fo c u s o n w ireless p a ck et netw o rk s b a sed o n th e IE E E 8 0 2 .1 1 b p ro to c o l, c o m m o nly u sed to b u ild lo c a l a rea netw o rk s o f p a lm to p a nd no teb o o k c o m p u ters. D u e to lim ited b a ttery lifetim e o f m o b ile term ina ls, energ y c o nsu m p tio n o f w ireless interfa ces b ec o m es a critic a l d esig n co nstra int. W ith in th e IE E E 8 0 2 .1 1 sta nd a rd , p o w er c o nserva tio n p ro to c o ls h a ve b een im p lem ented th a t tra d e p o w er fo r p erfo rm a nce. In th is tu to ria l, w e p resent a p o w er-a c c u ra te m o d el o f w ireless netw o rk interfa ce c a rd th a t a llo w s th e p o w er/ p erfo rm a nce tra d e-o ff to b e stu d ied a s a fu nctio n o f tra ffi c p a tterns im p o sed b y th e a p p lic a tio ns. T h e m o d el h a s b een va lid a ted a g a inst m ea su rem ents o n rea l h a rd w a re d evices.