Originally Posted by
Sallyann1234
The present concerns are not relating to 'significantly higher frequencies' but to C band, between 3 and 4 GHz. The precise relationship between the mobile and aeronautical services is documented in detail earlier in this thread. There are indeed long term plans for much higher frequency bands for 5g, but they are still in the field of research.
Yep. Currently, the use of the higher frequencies is limited, though, IF 5G gets approved, the higher frequencies will become used more widely and the chance of RA disruption goes up.
Originally Posted by
Sallyann1234
As for interference to GPS, the new cellular band at 3GHz is much further from the GNSS band than the older cellular bands. There doesn't seem to be any interference related to to those. Indeed modern smartphones have cellular radios and GPS receivers working within the same device.
Yep, interference does not have to be an issue, though, if you do have legacy equipment, the "shielding" is not enough to have the 5G and RA bands this close together. Add that 5G does have multichannel and a wider spectrum, and you can see a higher chance of low level signals stray into the RA bands at a signal level, that the legacy equipment in the airplanes does get confused.