Report: Expect Interference From Reallocated TV Spectrum
November 15, 2011
WASHINGTON: Broadcasters will have to expect some levels of
interference from wireless transmissions as part of the reallocation of
broadcast spectrum, says a report by a Department of Commerce advisory
committee on managing broadcast spectrum. At a meeting held Nov. 10, the
committee accepted a report from its Search for 500 MHz Subcommittee, which
recommends that “commercial users” of reallocated spectrum “accept reasonable
and defined levels of interference.”
The report will be forwarded to the National Telecommunications and Information
Administration, the agency within Commerce tasked with advising the president
on telecommunications and information policy issues. The recommendations were
made public in August 2011, and few comments have been received on them, said
Michael Calabrese, who is member of the committee and the subcommittee. Those
from committee member Jennifer Warren, considered “clarifications,” were
included with the recommendations as attachments.
The report’s recommendations include:
~ NTIA should utilize long-term evolution technology characteristics for its
initial interference and other analyses, and should work closely with industry
to fully understand system impacts and refine analysis and sharing solutions.
LTE, commonly referred to as “4G” is the most recent standard for mobile
~ NTIA should implement an informal process, consistent with all applicable
laws, to directly exchange data and have a dialogue between government and
industry in order to facilitate and implement the spectrum recommendations in
~ NTIA should stage the availability of the 1,755-1,850 MHz band for commercial
use, with priority on the early availability of 1,755-1,780 MHz, and extending
in contiguous stages as necessary to accommodate the relocation and returning
of government users.
~ NTIA should make spectrum available such that commercial users have exclusive
use. However, given existing government uses, industry supports making spectrum
available subject to pre-defined sharing zones where the commercial users
accepts reasonable and defined levels of interference.
Warren’s comments say that both “the two-stage approach outlined for 1,755-1,850
MHz” and “any reallocation decisions must address upfront how relocation will
be addressed for users across the entire band.”
Since that band is of highest priority to industry, “auction revenue could be
optimized for the full 95 MHz if relocation issues, such as replacement
spectrum and timing for relocation of incumbents, were dealt with as early as
possible to provide adequate planning and preparation time for both prospective
bidders and current incumbents,” according to Warren.
“Bifurcating the process by needlessly delaying challenging decisions
associated with clearing the entire band would sacrifice a reasoned,
longer-term decision cycle for the near-term expediency of holding the ‘first’
auction in this band,” she said.
In addition, the principle that “clearing spectrum should be the goal,” should
include the caveat “when feasible,” according to Warren. For “auctioning
cleared spectrum is the clearest path forward for optimizing auction revenue,
and should be pursued whenever possible,” she wrote.
However, she said, it is difficult to support the recommendation for specific
bands “without a full understanding of the costs and benefits of full
clearance, particularly when key considerations such as replacement spectrum
are not yet known. The latter is an especially important factor in light of the
lack of ‘open’ bands to which incumbents may easily be moved, which is itself a
factor that could add time and cost to a cost-benefit analysis of how and when
a band may be auctioned.”
~ J.J. Smith, Government Video
October 18, 2011: “1,500 MHz of
Federal Spectrum To Be Evaluated for Broadband”
The Commerce Department has identified 1,500 MHz of federal spectrum to
further evaluate for wireless broadband, while Congress considers legislation
to reassign 120 MHz of broadcast TV spectrum for the same purpose.