TV White Spaces Second MO&O: A Second Memorandum Opinion and Order that will create opportunities for investment and innovation in advanced Wi-Fi technologies and a variety of broadband services by finalizing provisions for unlicensed wireless devices to operate in unused parts of TV spectrum.
Early discussion of White Spaces proposed that client devices would be responsible for finding vacant spectrum to use. This “spectrum sensing” or “detect and avoid” technology was sufficiently controversial that a consensus grew to supplement it with a geolocation database, where the client devices determine their location using GPS or other technologies, then consult a coverage database showing which frequencies are available at that location.
Among the Internet companies this consensus now appears to have evolved to eliminate the spectrum-sensing requirement for geolocation-enabled devices.
The Register says that this is because spectrum sensing doesn’t work.
The Associated Press predicts that the Order will go along with the Internet companies, and ditch the spectrum sensing requirement.
Some of the technology companies behind the white spaces are fighting a rearguard action, saying there are good reasons to retain spectrum sensing as an alternative to geolocation. The broadcasting industry (represented by the NAB and MSTV) want to require both. It will be interesting to see if the FCC leaves any spectrum sensing provisions in the Order.