Definition - What does White-Space Spectrum mean?
The white-space spectrum is a term for bands of frequencies that exist in the general range used for television broadcasting that have recently become available in some countries for various kinds of mobile devices. The lower frequencies of many of these unused signals make them desirable for commercial use, partly because they are better able to penetrate walls and other physical obstacles.
Techopedia explains White-Space Spectrum
The disclaimer for the white-space spectrum is that companies must identify which signals are not being actively used for television broadcast. It's also incumbent upon device makers and other tech companies to come up with ways to find the best frequencies for communication in real time. Experts believe that with legislate progress, tech makers now need to catch up in terms of making products that can take advantage of the available frequencies.