Der Schuldige kann die Power Save-Zertifizierung sein.
Von Wikipedia :
The underlying concept of WMM PowerSave is that the station (STA) triggers the release of buffered data from the access point (AP) by sending an uplink data frame. Upon receipt of such a data (trigger) frame the AP releases previously buffered data stored in each of its queues.
Der AP würde also Pakete verzögern, bis sie "angewiesen" werden, sie freizugeben.