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The unique nature of the spectrum makes designing networking algorithms and protocols a challenge. There are several digital TV white spaces in the band, and the demands of access points vary over time. "Since in a TV band you don’t get continuous contiguous spectrum—a typical white-space chunk has 6 MHz—you need at least two radios to tune to different bandwidths. Our algorithms decide which radio will choose which bandwidth," says Srinivasan.

"We are fast entering a world where mass-market mobile devices consume thousands of megabytes each month," FCC Chairman Julius Genachowski warned at CTIA Wireless yesterday. "So we must ask: what happens when every mobile user has an iPhone, a Palm Pre, a BlackBerry Tour, or whatever the next device is? What happens when we quadruple the number of subscribers with mobile broadband on their laptops or netbooks?"The short answer: We will need a lot more spectrum."