Both parties of Congress has been increasingly critical of federal agencies’ inefficient use of spectrum in the past few years and it seems like agencies are getting the message. The NTIA, which is the official manager of federal agency spectrum, released a letter yesterday announcing that the Department of Defense would be relocating some of its systems. Defense had reached an agreement with broadcasters that Defense systems will share spectrum in the Broadcast Auxiliary Service (BAS) band.

The soon-to-be vacated band held by Defense will eventually be auctioned off–hopefully in 2014–for billions of dollars and likely used for mobile broadband provided by wireless carriers like AT&T, Verizon, Sprint, and T-Mobile. These carriers face serious congestion problems because of government-created scarcity of spectrum.

The carriers actually had targeted some of BAS spectrum because they weren’t convinced Defense would be willing to move their systems. The broadcaster deal reached with Defense means everyone’s apparently happy–the broadcasters can keep their BAS spectrum, the feds get new equipment and Congress off their back (temporarily), and the carriers get new spectrum for auction.

The deal is welcome news because the spectrum will be put to a higher-valued use once auctioned. The federal government pays almost nothing for its own spectrum and is a poor steward of the resource. Transferring spectrum from agencies to carriers means lower phone bills and more mobile broadband coverage. Government agencies are notoriously resistant to moving their systems or sharing with others, so entering into a sharing pact with the broadcasters indicates some of the resistance is thawing.

It’s not unequivocal good news, though.

The government is clearing out from a 25 MHz band of spectrum and occupying the larger, 85 MHz BAS band that will be shared with broadcasters. The military will need a larger band because sharing imposes some capacity constraints necessitating new, agile systems that search the airwaves to make sure they don’t interfere with existing broadcast users. Dynamic sharing like this only adds to the cost and complexity and may imperil next years’ planned auction.

Further, the BAS band is unavailable for auction only because of the antiquated command-and-control regime the FCC uses to award spectrum licenses. BAS is mostly used for electronic news gathering, which relays local and national newscasts from reporters on the scene to broadcast studios. Broadcasters have used BAS spectrum since the 1960s when it was allocated to them for free.

In a market, broadcasters likely would not have as much BAS spectrum as they currently have. In fact, because of technology changes and squeezed newsroom budgets, broadcasters are finding cheaper alternatives. Increasingly, journalists are using carriers’ LTE technology to transmit their breaking newscasts since the technology costs a fraction of the cost of news vans and equipment needed for BAS transmissions. That is to say, there are alternative business models in the absence of Soviet-style allocations.

So despite these industry changes, BAS spectrum cannot be auctioned for its highest-valued use (probably mobile broadband) under current FCC rules. Further, it will be even more difficult to bring the benefits of auctions to the airwaves if federal users are intermingling with existing users, broadcasters in this case. It’s a trend to be wary of. Let’s just hope that next year’s planned auctions occur on time so that more consumers can benefit from mobile broadband.

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