3GPP 23.501 v20.2.0 — the document's own text

5.34.4 Usage of an UL Classifier for a PDU Session controlled by I-SMF

Taught in 26. Relays, satellites, femtos and shared networks (The 5G system architecture, in depth).

This clause applies only in the case of non-roaming or LBO roaming as control of UL CL/BP in VPLMN is not supported in HR case.

When I-SMF is involved for a PDU Session, it is possible that the UL CL controlled by I-SMF is inserted into the data path of the PDU Session. The usage of an ULCL controlled by I-SMF in the data path of a PDU Session is depicted in Figure 5.34.4-1.

Figure 5.34.4-1: User plane Architecture for the Uplink Classifier controlled by I-SMF

The I-SMF determines whether UL CL will be inserted based on information received from SMF and the I-SMF selects the UPFs acting as UL CL and/or PDU Session Anchor providing local access to the Data Network.