Look at 3GPP’s 5G and the Industrialised Internet of Things.
During the last 30 years there has been a lot of work with FDMA/TDMA/WCDMA/OFDMA/etc..
As highlighted you could work with a Vendor for the implementation.
Good application for your case is “spectrum farming” or “spectrum re-refarming”. Good if you can have a business case. This will help to get the backing.