Unlicensed Use of TV Guard Bands Would Be 'Wi-Fi on Tranquilizers,' Brattle Says

Allowing unlicensed operations to use the TV guard bands after the TV incentive auction, as proposed by the FCC, is a doubly bad idea, Brattle said in a report filed Wednesday and paid for by Qualcomm. The policy will be ineffective because operations in the guard bands won’t attract investment, Brattle said. “Their limited bandwidth makes the 600 MHz guard bands inferior to the unlicensed bands at 2.4 GHz and 5 GHz for Wi-Fi-type applications, and the necessarily limited transmit power precludes use of 600 MHz unlicensed devices altogether for long-range applications such as rural broadband.” All use of the spectrum would yield is “Wi-Fi on tranquilizers,” the report said. The potential interference will also mean carriers are less likely to buy spectrum in the incentive auction, Brattle said. “Our analysis of an LTE network in a band similar to 600 MHz shows that a 5 percent loss of capacity due to interference from unlicensed operations in the guard bands will lower the value of the affected spectrum by 9 percent; a 20 percent loss of capacity will lower its value by 43 percent; and a 35 percent loss of capacity will eliminate most (93 percent) of its value.” Michael Calabrese, director of the Wireless Future Project at New America’s Open Technology Institute, told us he's not surprised by the report because Qualcomm has long opposed unlicensed use of TV spectrum, including the TV white spaces. "It simply reemphasizes our concern that Qualcomm is attempting to kill Wi-Fi in everything but the 2.4 GHz band," said Public Knowledge Senior Vice President Harold Feld.