name: SMF
full_form: Session Management Function
context: The uplink application's traffic redirection may be enforced either in the SMF (as specified in 5.8.2.5 Control of user plane forwarding) or directly in the UPF. The redirect destination may be provided in the dynamic PCC rule or be preconfigured, either in the SMF or in the UPF. When receiving redirect information (redirection enabled/disabled and redirect destination) within a dynamic PCC rule or being activated/deactivated by the PCF for the predefined redirection policies, SMF shall decide whether to provide and what information to be provided to the UPF based on where the redirection is enforced and where the redirect destination is acquired/preconfigured. When redirection is enforced in the UPF and the redirect destination is acquired from the dynamic PCC rule or is configured in the SMF, SMF shall provide the redirect destination to the UPF. When redirection is enforced in the SMF, SMF shall instruct the UPF to forward applicable user plane traffic to the SMF.
description: The Session Management Function (SMF) is a critical component within the 5G core architecture responsible for managing sessions and controlling user plane forwarding. It plays a key role in enforcing uplink application traffic redirection, either directly or through interaction with the User Plane Function (UPF). The SMF makes decisions on providing redirect information to the UPF based on where redirection is enforced and how the redirect destination is acquired or preconfigured.
explanation: SMF is classified as a Network Function because it serves as a central component in managing sessions, controlling user plane forwarding, and enforcing traffic redirection policies within the 5G core network, aligning with the 3GPP's specifications for efficient session management operations.
section_title: 5.8.2.8.3 Redirection
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