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SAN DIEGO (AP) — The chairman of the Federal Communications Commission warns of a "looming spectrum crisis" if the government fails to find new ways to ensure there is enough bandwidth for mobile devices.

Julius Genachowski said at an industry conference Wednesday in San Diego that the government is tripling the amount of spectrum available to companies. The problem is that many experts predict wireless traffic will increase 30 times, because of video and other bandwidth-heavy applications.

The chairman called that gap between demand and supply "the biggest threat" to mobile services. He announced plans for a far-reaching review that addresses what to do about it.

The possibilities include reallocating existing spectrum that is now used for other purposes, and encouraging development of new technologies.