The Wi-Fi Alliance , an industry group that certifies Wi-Fi products for interoperability, has highlighted the importance of the technology to the daily lives of Americans ahead of a testing summit that will try to shed some light on potential conflicts between Wi-Fi and a carrier technology called LTE-U. LTE-U is a technology that some U.S. wireless carriers want to use to take the pressure off their networks - using the same unlicensed spectrum as Wi-Fi networks.