3GPP 24.501 v20.0.0 — the document's own text
8.2.19.36 RAN timing synchronization
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
This IE may be included to provide information related to the RAN timing synchronization to a UE which has set the Reconnection to the network due to RAN timing synchronization status change (RANtiming) bit to "Reconnection to the network due to RAN timing synchronization status change supported" in the 5GMM capability IE of the REGISTRATION REQUEST message.