3GPP 38.300 v19.3.0 — the document's own text
9.2.2.4.2 Network triggered transition from RRC_INACTIVE to RRC_CONNECTED
Taught in 7. How a connection is set up, and how it is moved (TSG RAN — the group that specifies the radio, in depth).
The following figure describes the network triggered transition from RRC_INACTIVE to RRC_CONNECTED:
1. A RAN paging trigger event occurs (incoming DL user plane, DL signalling from 5GC, etc.).
2. RAN paging is triggered; either only in the cells controlled by the last serving gNB or also by means of Xn RAN Paging in cells controlled by other gNBs, configured to the UE in the RAN-based Notification Area (RNA).
3. The UE is paged with the I-RNTI.
4. If the UE has been successfully reached, it attempts to resume from RRC_INACTIVE, as described in clause 9.2.2.4.1.