Section: 4.3.4 PDU Session Release 4.3.4.1 General
Content: The PDU Session Release procedure is used to release all the resources associated with a PDU Session, including: - The IP address/Prefixes allocated for an IP-based PDU Session; this may include the release of multiple Prefixes in the case of Multi-homing (as defined in TS 23.501[ System architecture for the 5G System (5GS) ]  [2]). - Any UPF resource (including N3/N9/N19 termination) that was used by the PDU Session. For N19 termination, the UPF resource may be released if all the PDU Sessions associated with the 5G VN group are released. - Any access resource that was used by the PDU Session. The SMF takes care to notify any entity associated with PDU Session: PCF, DN (e.g. when DN authorization has taken place at PDU Session establishment), etc. of a PDU Session Release.