Three complete, 3GPP-grounded references — 5G NR, LTE 4G and 5G NTN — pick a stack to explore it layer by layer.
the 5G radio access network, layer by layer — from the 3GPP specs
the LTE / EPS radio access network, layer by layer — from the 3GPP specs
5G NR over satellite — the non-terrestrial radio access network, layer by layer, from the 3GPP specs
learning paths, glossary, comparison and labs