3GPP 38.300 v19.3.0 — the document's own text
4.9.5 Network-controlled repeater management
Taught in 4. What NR actually is, in the shape its own document gives it (TSG RAN — the group that specifies the radio, overview).
Network-Controlled Repeater identification is performed in RAN, and Network-Control Repeater authorization is performed in 5GC. The general procedure of the Network-Controlled Repeater management is illustrated in Figure 4.9.5-1:

1. The gNB broadcasts the Network-Controlled Repeater supported information via system information.
6. When a Network-Controlled Repeater is trying to access the network as a Network-Controlled Repeater, the Network-Controlled Repeater indication is sent to the serving gNB.
7. The serving gNB selects an appropriate AMF for the Network-Controlled Repeater.
9. AMF provides Network-Controlled Repeater authorization information to the gNB.
Other steps refer to the signalling flow as defined in 9.2.1.3.