The Access Point will maintain the following for Power management stations and to handle buffered traffic for U-APSD
- The Access Point will maintain the power management status of each connected station. It will also maintain the per Access Category U-APSD status for each connected WMM Station
- If the 802.11 WMM station is in power save mode – the WMM Access point will have to buffer frames meant for the 802.11 station till a trigger by the 802.11 station or till packet expiry.
- Access Points may maintain separate U-APSD queue for U-APSD enabled stations
- If the 802.11 Station has enabled certain Access categories to be delivery enabled (e.g voice/video) and other access categories (BE/BK) to be trigger enabled via TSPEC mechanism, then the following is pursue
- The partial virtual bitmap sent by the Access point for the 802.11 station will only mention that buffered traffic is present for the trigger enabled access categories
- If all the access categories are delivery enabled at the 802.11 station – then the partial virtual bitmap indicates buffered data for all access categories
- The Access Point will not send more than the number of frames negotiated in the Max Service Period Length Field