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Wireless & Mobility · Advanced

Unscheduled Automatic Power Save Delivery (U-APSD)

WMM Power Save method where a client's uplink frame triggers delivery of buffered downlink frames.

Definition

U-APSD lets voice clients wake, send a frame, and receive all buffered frames for configured access categories. It is ideal for bidirectional voice traffic. It is certified as WMM Power Save.

Exam tip

U-APSD suits VoWLAN because uplink voice frames trigger downlink delivery.

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