AT&T, Verizon, FWCC Agree on 6 GHz Interference Concerns
Wednesday, November 27, 2019 | Comments

AT&T Services and Verizon executives came together to lobby the FCC on the commission’s 6 GHz proposal to allow unlicensed services in the band.

During the Nov. 19 meeting, AT&T executives said they are concerned that the technical analyses provided to date by supporters of unlicensed operations in the licensed microwave bands have relied on unrealistic parameters that discount the potential impact to incumbent microwave systems. AT&T presented real-world deployment scenarios that demonstrate that radio LAN (RLAN) interference to fixed services (FS) links is a significant problem and that RLANs — Wi-Fi-type devices — require automatic frequency control (AFC) in all cases (including indoors) to avoid harmful interference to incumbent FS systems.

Separately, the Fixed Wireless Communications Coalition (FWCC) also expressed concern with proposals to deploy RLANs with no AFC in the FS bands at power levels up to 30 dBm effective isotropic radiated power (EIRP) for indoor devices and 14 dBm EIRP for outdoor devices.

“These could make up the majority of all RLANs,” the FWCC filing said. “They would be able to transmit anywhere, anytime, on any 6 GHz frequency, without regard to the risk of harmful interference to FS receivers nearby.

The proposed power levels are unheard of for unlicensed devices in a band that carries licensed, critical services. … There is no precedent for this degree of potential interference.”

The AT&T filing is here, and the FWCC ex parte letter is here.

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