60 GHz Radar FNPRM Raises Concerns for Other Users

Proposals in a July FCC Further NPRM, seeking revised rules for short-range field disturbance sensor (FDS) radars in the 60 GHz band (see 2107090047), got general support in comments due Monday in docket 21-264. Facebook, Intel and Qualcomm, which have other operations at 60 GHz, urged caution. “Adopt technical rules to ensure successful sharing with all types of unlicensed communications devices, applications, and services that use this band, including ultra-high throughput and ultra-low latency Wi-Fi,” they commented. Radars, subject to the 10% duty cycle limitation proposed in the NPRM, “can repeatedly interrupt short range communications equipment in this band unless the radar applications provide sufficiently long silent periods that communications applications can meaningfully use,” they said: A review of devices operating under an FCC waiver “demonstrate that radar devices are, in fact, operating with a much higher effective duty cycle that blocks other operations and impacts the ability of communications applications to meaningfully utilize the spectrum.” The Wi-Fi Alliance said any rules “to permit expanded use of FDS devices must ensure that those devices can co-exist with, and cause no harmful interference to, unlicensed operations in the 60 GHz band.” Most others support the proposal in the FNPRM. “Given the continued interest in use of mobile radars in the 60 GHz band and the success of various innovative and beneficial deployments under recent waivers, the time is ripe to revisit and broaden these rules,” said the Alliance for Automotive Innovation. “Increase flexibility in the band for future innovative automotive use cases, including those that may operate outside of the vehicle cabin environment or those facilitating detection over greater distances,” the alliance urged. “Radar technologies in the 60 GHz band have been approved for gesture control, detection of unattended children or pets in vehicles, sleep assessment, and monitoring of vulnerable medical patients,” Google said. The FNPRM proposes to authorize FDS devices in 57-64 GHz at 20 dBm effective isotropic radiated power without coexistence, Amazon noted, urging extending that “across the entire 14 gigahertz of the band.” Amazon supported ending current waivers as long as “any rule changes adopted in this proceeding are not more technically and operationally onerous than the FDS waivers." Provide "as much flexibility as possible,” asked IEE Sensing: Set technical operating limits “and allow all manner of devices to operate in the 60 GHz band, so long as they stay within the ‘technical envelope’ set forth in the amended rules, rather than try to limit allowable use cases, like the Commission did in the 60 GHz Waiver Order, where sensors could only be deployed to ‘passenger motor vehicles.’”