UAPSD - Unscheduled Automatic Power Save Delivery

The term U-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 Unscheduled variant is triggered by a Station receiving either a Delivery or Trigger enabled frame from a particular access class.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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