AT&T says it is on track to upgrade its Long-Term Evolution network to the new LTE-Advanced standard, which promises faster connectivity for the nearly 240 million U.S. subscribers who get their mobile data service from the carrier. John Donovan, an executive in the AT&T Technology and Network Operations business, says LTE-A will enable the company to provide the benefits of contiguous spectrum even in areas where spectrum doesn't overlap. He also commented on the company's announcement that it has embraced LTE interoperability in the lower 700 MHz A block.

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