Power Management Approach
νAllow idle stations to go to sleep
–station’s power save mode stored in AP
νAPs buffer packets for sleeping stations.
–AP announces which stations have frames buffered
–Traffic Indication Map (TIM) sent with every Beacon
νPower Saving stations wake up periodically
–listen for Beacons
νTSF assures AP and Power Save stations are synchronized
–stations will wake up to hear a Beacon
–TSF timer keeps running when stations are sleeping
–synchronization allows extreme low power operation
νIndependent BSS also have Power Management
–similar in concept, distributed approach
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