The C-band (3GPP band n77) as used in the US saw 5G usage as high up as 3.980GHz whereas the majority of other countries stop at 3.8GHz (3GPP band n78). Hence in other markets the guardband between C-Band use for 5G and RA between 4.2G to 4.4G is a generous 400MHz and only 220MHz in US. The concerns about the inefficient blocking on RA’s resulted in very cautious approaches to avoid inbound inference from ground base stations into the RA. Tx power limitations were implemented close to airports. However in Japan 5G used as high as 4.1G without interference into RA’s.