The FCC says, “administrators may charge fees to register fixed TV band devices and temporary broadcast auxiliary fixed links and to provide lists of available channels to TV band devices.” The database is meant to tell an unlicensed device which channels are vacant, as well as to regiser the locations of fixed transmitters and “protected locations and channels” not listed in FCC databases.
White spaces are unused television frequencies. They have been freed up by the shift to digital television. Analog television required broadcasters to leave blank televison channels between nearby transmitters to prevent cross channel interference. Digital television created much more “free space” in the television band.
Google supports the white space concept, as does Microsoft, Dell, and other consumer electronics companies. Broadcasters have consistently opposed “white space” legislation, claiming they may cause harmful interference to television reception.
Microsoft, Dell, and Spectrum Bridge helped design and deploy a wireless TV white spaces network to distribute broadband Internet connectivity in Claudville, Virginia, under an experimental license granted by the FCC earlier this year.
The Spectrum Bridge Web site, ShowMyWhiteSpace.com, offers a free search tool that lists all open white spaces channels at any address in the U.S. Their database system helps prevent interference by mapping broadcast television stations and assigns non-interfering frequencies to white spaces devices. It can adapt in real time to new TV broadcasts, as well as to other protected TV band users operating in the area.
Proposals for those looking to become administrators for the white spaces database are due by June 4, 2010, and the FCC will invite comments on the proposals until Feb. 3. The commission did not set a date for naming the administrators.
A November 2008 FCC decision opened up white spaces in the broadcast television band, from 512MHz to 698MHz. TV white spaces can cover larger areas areas than WiFi, although their power is limited to 1 watt (100mW mobile). Devices “listen” before they “talk” and utilize maps of nearby licensed transmitters to prevent interference. It potential interference is detected, they switch to another channel.
Related DailyWireless stories include; White Spaces Trialed in North Carolina, Study: White Spaces Worth $100B, Microsoft’s WhiteFi: Wi-Fi Using Whitespaces, NAB to FCC: White Spaces Illegal, Free White Space Mapping, White Spaces: It’s The Law, TV White Spaces: New Era for Wi-Fi?, NAB: Blowblack on Whitespace, White Spaces: Green Light from FCC Report, White Space Field Testing, Welcome to the White Space, Microsoft Disputes FCC Unlicensed Finding, FCC: License-free 700MHz Devices Failed Test, Broadcasters: Portable Devices Kill DTV, Mud Fight in White Space, Pushing for “White Space”, Google Launches White Space Offensive, Motorola on Whites Spaces: We’re Good, White Space Field Testing, Google Pitches White Spaces, White Spaces: Now It’s GE, CTIA: Unlicensed White Spaces Bad, 700 MHz Resurrected in White Space, White Space War Continues, White Spaces Prototype: Dead Again, Sprint and T-Mobile Support “White Space” Use, White Space Gets Hot, FCC Broadband Taskforce Recommendations, Consumers to FCC: 700MHz Democracy Now!, Broadband Wireless — Hello Goodbye, Microsoft’s “Free” Phone?, Bills Expand Unlicensed UHF Access, 700MHz Battle Begins, Cognitive Brains Self Organize, Unlicensed 700Mhz Access, Mobile/Handheld TV: Killer App?, Mobile TV War at NAB, NAB 2007: Dead Man Walking? and Unlicensed Spectrum: The Sum of All Fears.
