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Wireless & Mobility · Intermediate

Power Save Mode

802.11 mechanisms allowing clients to sleep while the AP buffers their traffic.

Definition

Clients signal sleep with the power management bit; APs buffer frames and advertise them in the TIM. Methods include legacy PS-Poll, WMM Power Save (U-APSD), and 802.11ax TWT. Power save trades latency for battery life.

Exam tip

Know the evolution: legacy PS, U-APSD, TWT.

Related terms