In spite of the perceptiveness of IATA and IFALPA in NOV 2020, we get 5G on the same band as the RA's???? WTF!
Just to be clear, they are not in the same band. They are in adjacent allocations, with a small guard band in between.
For interference to be avoided, two conditions need to be met. 1) the 5G equipment must not radiate significantly outside its allocated band, 2) the airborne equipment must must not be significantly sensitive to transmissions outside its allocated band. And of course the same conditions apply in reverse.
It is the task of frequency administrations to specify operating limits accordingly - and this must be done on an international basis.