Federal regulators are working to head off what they call a “looming spectrum crisis” — a severe shortage of the wireless frequencies that deliver data and allow smartphones to perform all the tasks people expect. Wireless companies have 534 megahertz of spectrum allotted to them, with an additional 50 megahertz in the pipeline, but the industry says it needs at least 800 megahertz more within six years to accommodate demand. The Federal Communications Commission is expected next month to deliver a sweeping proposal to expand broadband. Options being discussed include reallocating spectrum from TV broadcasters, satellite TV firms or federal agencies to wireless providers.Read more from the San Jose Mercury News.