name: UPF
full_form: User Plane Function
context: whole traffic for this PDU session). 4. The SMF updates the UPF1 with UPF -UL CL CN Tunnel Info for the downlink traffic. 5. The SMF updates the UPF2 with UPF -UL CL CN Tunnel Info for the downlink traffic. The data path for DL traffic is established between UPF2 and UPF BP/CL UL, and the point of measurement for DL traffic in UPF2 is UPF BP/CL UL as already indicated in step 3. 6. The SMF updates (R)AN via AMF for AN resource setup, (R)AN and UPF BP/UL CL tunnels information exchange. [7-8] In case of IPv6 multi-homing: New UE IPv6 prefix assignment and SMF reconfigures UE IPv6 prefix for UPF1. 9. At any time a Re-authorization triggers occurs. B. The Charging session is updated and the SMF reports the usage collected from UPF BP/CL UL, for traffic to/from UPF1 and traffic to/from UPF2. The last UL/DL counts collected from UPF1 are reported when the UPF1 is released later on. In which step(s) of the scenario the SMF needs to interact with the charging domain will be determined during
description: The User Plane Function (UPF) is a network function in the 5G core network responsible for handling user plane traffic, including packet inspection and forwarding. It plays a crucial role in managing data paths and tunnels between different network functions.
explanation: Based on its responsibilities of handling user plane traffic, updating tunnel information, and interacting with other network functions like SMF and AMF, the UPF clearly fits the definition of a Network Function.
section_title: 5.3.4.2.2Procedure description - Addition of additional PDU Session Anchor and Branching Point or UL CL
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biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O