3GPP 23.501 v20.2.0 — the document's own text
5.35.5 Charging support with IAB
Taught in 26. Relays, satellites, femtos and shared networks (The 5G system architecture, in depth).
IAB-donor has all the information regarding the UE and the IAB-node and corresponding mapping of the bearers. The PDU sessions for the UE and IAB-node are separate from IAB-node onwards to the core network. Therefore, the existing charging mechanism as defined in clause 5.12 can be used to support IAB.