3GPP 23.501 v20.2.0 — the document's own text
U.1 General
Taught in 18. Being served by somebody else's network (The 5G system architecture, in depth), 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
The Home PLMN operator can deploy H-UPFs on sites located physically close to the VPLMN (e.g. visited region) for the support of the local traffic routing at the H-UPF, i.e. home session breakout performed at the H-UPF controlled by H-SMF.
Figure U.1-1 depicts the deployment scenario of H-UPF nearby VPLMN for HR PDU Session for traffic offloading at the H-UPF. For simplicity, other network functions are not shown.