SAPSD – Scheduled Automatic Power Save Delivery
The term S-APSD is used in wireless networks supporting the IEEE 802.11e Quality of Service enhancement. It was introduced in order to support power management in QBSS. In essence, it involves a QAP delivering downlink frames which belong to a specified access class to power saving Stations automatically. The Scheduled variant defines fixed intervals of time specified to the Station within a TSPEC.
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