3GPP 38.300 v19.3.0 — the document's own text

4.3 Network Interfaces

Taught in 4. What NR is — the shape of the 5G radio network (TSG RAN — the group that specifies the radio, in depth), 2. The six working groups and the line between them (TSG RAN — the group that specifies the radio, overview), 4. What NR actually is, in the shape its own document gives it (TSG RAN — the group that specifies the radio, overview), 2. The six groups, and what each one worries about (TSG RAN — the group that specifies the radio, quick start), 3. What NR is, read off the document itself (TSG RAN — the group that specifies the radio, quick start).