What is Data Plane?
The data plane (also called the user plane) is the part of a telecommunications network responsible for carrying user traffic — voice, video, web browsing, and application data — between endpoints. It is distinct from the control plane, which handles signalling, session management, and network policies. In 5G architecture, the separation of control plane and user plane (CUPS) is a foundational design principle that enables independent scaling, flexible deployment, and optimal placement of network functions.
How Does Data Plane Work?
In 5G, the data plane is handled primarily by the UPF (User Plane Function) in the core network and the gNB in the RAN. User IP packets flow from the UE through the gNB’s SDAP, PDCP, RLC, and MAC layers, across the NG-U interface to the UPF, and then out to the data network (internet or enterprise). The UPF performs packet routing, forwarding, QoS enforcement, traffic measurement, and lawful intercept. Because the data plane is separated from control functions (AMF, SMF), UPFs can be deployed at the network edge (for low latency) or centrally (for efficiency) without affecting control plane topology.
Use Cases
Mobile broadband data delivery, MEC (edge computing) deployments requiring local data breakout, enterprise traffic steering in private 5G, content delivery network optimization, and IoT data aggregation and forwarding.
Related Terms
Control Plane | UPF | CUPS | SBA | Core Network
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This glossary entry is part of the 5GWorldPro Complete 5G Glossary. To go deeper into 5G architecture and technology, explore our 5G Training courses.
