Thomas Kunz
Systems and Computer Engineering
183
Power Management
nIdea: switch the transceiver off if not needed
nStates of a station: sleep and awake
nTiming Synchronization Function (TSF)
–stations
wake up at the same time
nInfrastructure
–Traffic
Indication Map (TIM)
nlist of unicast receivers transmitted by AP
–Delivery
Traffic Indication Map (DTIM)
nlist of broadcast/multicast receivers transmitted by
AP
nAd-hoc
–Ad-hoc
Traffic Indication Map (ATIM)
nannouncement of receivers by stations buffering
frames
nmore complicated - no central AP
ncollision of ATIMs possible (scalability?)