...Google proposes setting aside three channels for their exclusive use plus incorporating beacons into the microphones that would send a clear, definitive signal warning all other devices to stay out of its spectrum.

But some high-tech companies fear that Google’s proposal might prompt the FCC to drop its investigation into spectrum sensing technology and therefore eliminate a large part of the potential market for white space devices. “The problem is that requiring geo-location and Internet access makes devices more expensive, and it effectively prohibits a number of applications that the other companies have in mind – for example, networking devices around the home,” said Michael Calabrese, VP and director of the Wireless Future Program at the New America Foundation, which favors unlicensed use of white spaces... LINK