5G • Core Network
I-UPF
Intermediate User Plane Function
User plane node inserted between gNodeB and PSA to provide localized traffic breakout or mobility bridging.
Technical Explanation
An Intermediate UPF (I-UPF) is dynamically inserted into the data path when a UE travels far from its anchor or connects to an edge network. It terminates N3 GTP-U from the gNodeB and tunnels traffic over N9 to the anchor PSA, or diverts local traffic directly via an Uplink Classifier.
Key Functions
- Inserted dynamically into data path between gNodeB and Anchor UPF
- Terminates N3 access tunnel and forwards traffic over N9 tunnel
- Enables Edge Computing local breakout without relocating anchor IP
Specifications
3GPP TS 23.501
Interfaces
N3N9N4
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