Unscheduled automatic power save delivery overview
Unscheduled automatic power save delivery (U-APSD) is a power-saving mechanism that
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is defined as a QoS facility in IEEE 802.11e standards
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delivers multiple downlink packets in response to a single uplink trigger, and
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reduces wireless latency and extends mobile device battery life
Additional information
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U-APSD activates automatically when WMM (Wi-Fi Multimedia) is enabled.
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U-APSD eliminates the need for polling individual packets at the access point.
Possible sequence for U-APSD operation:
A client device sends a single uplink trigger packet. In response, the access point delivers multiple queued downlink packets based on that single trigger.
View unscheduled automatic power save delivery
Show detailed information of a client by MAC address.
Device# show wireless client mac-address 2B:5B:B3:18:56:E9 detail
Output Policy State : Unknown
Output Policy Source : Unknown
WMM Support : Enabled
U-APSD Support : Enabled
U-APSD value : 15
APSD ACs : BK(T/D), BE, VI(T/D), VO(T/D)
Power Save : OFF
Current Rate :
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BK : Background
BE : Best Effort
VI : Video
VO : Voice.
T: UAPSD Trigger Enabled
D: UAPSD Delivery Enabled
T/D : UAPSD Trigger and Delivery Enabled
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