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The filing was made in response to a proceeding that the FCC is considering that looks at whether there are legitimate interference concerns in the lower portion of the 700 MHz frequency band of wireless spectrum. The history. Several wireless carriers, including the two largest -- AT&T And Verizon Wireless -- as well as, the smaller regional carriers that filed the report with the FCC, bought spectrum in the 700 MHz auction. But because of how the spectrum licenses were divided and how the spectrum was cleared at different points through its history, no single "band class" exists throughout the whole 700 MHz hunk of spectrum. (This is different from other spectrum bands, such as PCS and AWS, which have one "band class" across all the spectrum.).

The downside of not having a single band class across a band of spectrum is that devices using different band classes are not interoperable, When the 700 MHz spectrum was auctioned in 2008, there was an assumption that there would be two major band classes for commercial use, Companies buying spectrum in the lower A, B, and C blocks would use Band Class 12, And Verizon Wireless, which bought most of the Upper C block, would use Band Class 13, The two band classes wouldn't be interoperable, But because AT&T bought spectrum in the Lower B and C block and because Verizon bought some Lower corgi, apple bottom jeans iphone case A and B block licenses, smaller players were confident that a viable ecosystem would be build around Band Class 12, which is for the lower 700 MHz spectrum..

But after the spectrum was auctioned off, AT&T, which only ended up with licenses in the Lower B and C blocks and none in the Lower A block, worked with the 3GPP standards body to develop Band Class 17. This new band class only includes support for Lower B and C block spectrum and it excludes A block spectrum, which are the licenses that the smaller regional players filing the letter to the FCC bought. Meanwhile, Verizon has deployed its 4G LTE network exclusively using its nationwide Upper C block 700 MHz spectrum. But it has never deployed its A and B block 700 MHz spectrum and is now trying to sell that spectrum to other players in exchange for buying AWS spectrum from cable operators.

Since their study indicates there are no interference issues for AT&T, these regional carriers claim that AT&T has used interference as merely an excuse, They say that by excluding the A block from its band class, AT&T has effectively created its own proprietary band class, which excludes smaller players, They claim that suppliers, such as Qualcomm and Motorola, which have gone along with AT&T's plans for the separate band class, have been slow corgi, apple bottom jeans iphone case to develop devices for their own Band Class 12, And because AT&T now has its own band class, devices that are made for carriers that use Lower A block spectrum won't be able to interoperate with AT&T for nationwide roaming..

The companies claim that AT&T's purpose for asking for this separate band class was to exclude them from the 4G LTE market. But AT&T says this is hogwash. AT&T said the new study that was filed this week is the same study that these companies referenced in a filing late last year when the FCC was considering conditions for AT&T's purchase of 700 MHz spectrum from Qualcomm. "The filing is little more than a dressed-up version of a study previously filed and refuted," an AT&T spokesman said in an email. " In short, the study proves little more than 'garbage in' will produce 'garbage out.'"In a previous response to the FCC on a similar interoperability study, AT&T poked holes in how the study was conducted. And it refuted assumptions that were made in the study that suggested that there would be no interference issues to devices operating in the Lower B and C block 700 MHz spectrum in areas where channel 51 is broadcasting.