# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

APSD Automatic Power Save Delivery

Automatic Power Save Delivery is a term used in WiFi to describe a power saving technique originally introduced in the IEEE 802.11e specification. It involves a QAP (Quality Access Point) delivering downlink frames (which belong to a specified Access Class) to Power Saving stations automatically, thereby preventing the need to poll for each frame as is usually performed. APSD defines two delivery mechanism - U-APSD (Unscheduled - Automatic Power Save Delivery) and S-APSD (Scheduled - Automatic Power Save Delivery).

Courses related to this term: Wi-Fi System Engineering

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