The USA’s three-tiered scheme for the CBRS band around 3.5 GHz has set many interesting precedents for how occupied spectrum can be flexible licensed and shared to maximize usage and allow both telecoms operators and other service providers to build networks. It provides three levels of priority – the top one for incumbent federal users; the second for companies that have acquired licences (which were planned to be accessible to a relatively wide range of users rather than just large operators); and the third for general authorized access (GAA), which is unlicensed but with a spectrum access system (SAS) ensuring that it is not a free-for-all like 2.4 GHz, thus improving quality of experience. After years of wrangling over the…