Repurposing Spectrum for Mobile Broadband Is Great, But Interference Issues Must Be Resolved First

[Commentary] As nearly all usable radio spectrum has been allocated to particular uses and assigned to particular users, shifting spectrum toward modern uses almost certainly requires taking from one use or user to give to other uses and users. Such spectrum repurposing need not be contentious and is often successful. The recent $41 billion AWS-3 spectrum auction, the largest-grossing auction in history, involved spectrum repurposed from Federal government incumbents to mobile wireless providers. Yet, success is not guaranteed.

Spectrum, like land, is typically “zoned” to particular uses that play nice together. For instance, a relatively low-powered satellite signal might be drowned in a sea of high-powered, land-based cellular signals. Like small and big dogs being kept separate at a dog park, different types of radio signals are managed to mitigate conflict using technical means such as power limitations and boundaries between interfering frequencies or assigning users and uses varying degrees of priority. Before one can reassign satellite spectrum to terrestrial wireless broadband use, therefore, one must seek permission from the FCC: terrestrial services are prone to interfering with satellite signals, so an approval requires a demonstration that interference with others is not a problem.

[Dr. George S. Ford is Chief Economist of the Phoenix Center for Advanced Legal & Economic Public Policy Studies]