name: UPF
full_form: User Plane 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 User Plane Function (UPF) is a network function within the 5G system architecture that plays a crucial role in enforcing uplink application's traffic redirection. It works closely with the Session Management Function (SMF) to manage user plane forwarding and redirection policies. The UPF can either receive redirect information from the SMF or have it preconfigured, allowing for flexible control over where and how redirection is enforced.
explanation: UPF is classified as a Network Function because it is involved in managing and controlling user plane traffic within the 5G network, specifically in relation to traffic redirection. Its interaction with other network functions like SMF highlights its role in the overall network architecture.
section_title: 5.8.2.8.3 Redirection
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