> I don't understand why they couldn't make the current base stations (they are SDR anyway) serve multiple standards. I had thought that was possible.
They can, but 2g and 3g are not built for sharing spectrum. They'd need to allocate a block of spectrum to each, and the minimum size blocks are too big. LTE and 5g can better share, so a block can use LTE compatible coordination with 5g for some slots and LTe for others. This should let LTE stay deployed for much longer (unless 6g can't be deployed in a compatible mode)
They can, but 2g and 3g are not built for sharing spectrum. They'd need to allocate a block of spectrum to each, and the minimum size blocks are too big. LTE and 5g can better share, so a block can use LTE compatible coordination with 5g for some slots and LTe for others. This should let LTE stay deployed for much longer (unless 6g can't be deployed in a compatible mode)