IEEE 802.11af is an amendment to the IEEE 802.11 base standard, also known commercially as Wi-Fi. The main difference from the well known IEEE 802.11a/b/g standards is that IEEE 802.11af is intended to operate in the TV White Spaces, that is the spectrum already allocated to the TV broadcasters but not in use in a specific location and time period.
IEEE 802.11af will use cognitive radio technology to identify white spaces it can use. This cognitive technology will be based on an authorized geolocation database. This database will provide information on which frequency, at what time and under what conditions networks may operate.