An anonymous reader writes: Rumors have surfaced that the Federal Communications Commission (FCC) will restrict bidding at their TV spectrum auction in 2015 to effectively favor smaller carriers. Specifically, when 'auction bidding hits an as-of-yet unknown threshold in a given market, the FCC would set aside up to 30MHz of spectrum in that market. Companies that hold at least one-third of the low-band spectrum in that market then wouldn't be allowed to bid on the 30MHz of spectrum that has been set aside.' Therefore, 'in all band plans less than 70MHz, restricted bidders—specifically AT&T and Verizon (and in a small number of markets, potentially US Cellular or CSpire)—would be limited to bidding for only three blocks.' The rumors may be true since AT&T on Wednesday threatened to not participate in the auction at all as a protest against what it sees as unfair treatment.