  The Federal Communications Commission (FCC) has allocated the 6 GHz band
(5.925 - 7.125 GHz) for unlicensed, shared use in the US. Incumbents in the
band are protected via Low Power Indoor (LPI) rules that do not require the use
of an Automatic Frequency Control (AFC) mechanism and Standard Power (SP) rules
which do. As the deployment of Wi-Fi 6E APs implementing LPI rules have been
increasing, there is limited research examining the real-world interference
potential of dense LPI deployments to fixed links, which remains a concern for
incumbents. We have conducted a first-of-its-kind extensive measurement
campaign of a dense indoor Wi-Fi 6E network at the University of Michigan,
which includes walking, driving, and drone measurements to assess outdoor
beacon Received Signal Strength Indicator (RSSI), building entry loss (BEL),
channel utilization, and appropriate enabling signal level for a proposed
client-to-client (C2C) mode in 6 GHz. Our detailed measurements under various
conditions show median outdoor RSSI between -75 dBm and -85 dBm, BEL between 12
dB and 16 dB through double-pane low-emission windows, and only 5% of indoor
Basic Service Set Identifiers (BSSIDs) observed outdoors. Our overall
conclusion is that the probability of interference to incumbent fixed links is
low, but more research is required to determine the appropriate signal level
for the C2C enabling signal.
