Following the adoption of new rules published in May, 2020 allowing use of new spectrum for emerging "6 GHz" devices, the Federal Communication Commission (FCC) Office of Engineering and Technology (OET) Laboratory Division has published a draft guidance document for public review covering certification of U-NII 6 GHz devices operating in the 5.925-7.125 GHz band.
The document can be found on the FCC OET Page, a shortcut provided here -
Other links;
FCC KDB document home;
https://apps.fcc.gov/oetcf/kdb/index.cfm
Archive copy of publication available at;
https://celectronics.com/pdf/FCC-6GHz-KDB.pdf