((a)) ** In general** Nothing in subparagraph (G) of or in shall be construed to prevent the Commission from using relinquished or other spectrum to implement band plans with guard bands.section 309(j)(8) of this titlesection 1452 of this title

((b)) ** Size of guard bands** Such guard bands shall be no larger than is technically reasonable to prevent harmful interference between licensed services outside the guard bands.

((c)) ** Unlicensed use in guard bands** The Commission may permit the use of such guard bands for unlicensed use.

((d)) ** Database** Unlicensed use shall rely on a database or subsequent methodology as determined by the Commission.

((e)) ** Protections against harmful interference** The Commission may not permit any use of a guard band that the Commission determines would cause harmful interference to licensed services.