How does WMM-Power Save compare to legacy 802.11 Power Save?
WMM-Power Save is a more finely tuned power save mechanism which draws on a variety of tools to manage power consumption. In legacy power save, the driver decided when to transmit data, while in WMM-Power Save, the application makes the determination about when to transfer data. This enables customization of the power mechanism to the particular application (e.g., Voice over Wi-Fi, video gaming, etc.). WMM-Power Save is backwards-compatible with legacy power save.