Am I the only one wondering what the point of this is?
Now you have 2 options:
1. Use off the shelf Quectel and Qualcomm devices and off the shelf existing embedded hardware. Then test and develop using common terrestrial networks and harden it for radiation. Pack and deploy.
2. Use something else that requires custom design, exotic hardware, untested interoperability, custom built terrestrial towers etc...
I'm going to vote on option 1 for saving time and money...
In passing, I'd note that I don't think cell technology would work without LoS; also, there's no atmosphere to reflect off of.
I guess if they're just thinking of some comm system for the moon, it might as well be 4G. (I guess? I'm not qualified to answer this.)