Standards
LTE , LTE-A : 36 Series
multiRAT : 37 series
5G beyond : 38 series
https://www.3gpp.org/DynaReport/37-series.htm : multiRAT
https://www.3gpp.org/specifications/specification-numbering
https://www.5gworldpro.com/5g-knowledge/46-3gpp-5g-specifications.html