DNN in the context of 5G networking stands for Data Network Name. It's a unique identifier used within the 5G network to specify the data network that a user's device (UE) is trying to access through a PDU (Packet Data Unit) session. Essentially, the DNN tells the 5G core network which external network or service the user is attempting to connect to, such as the internet, a specific enterprise network, or other services provided via the 5G network.

In practical terms, you can think of the DNN somewhat like a URL or domain name in the internet context—it specifies the destination network for the data traffic originating from the UE. The DNN is crucial for routing user data packets correctly through the 5G core network to the intended external data network. It plays a key role in the session management process, helping to ensure that the data packets are directed to the right place and that the appropriate quality of service and security measures are applied to the session.

This means the DNN identifies the particular external network (like the internet, an enterprise network, or a specific service) that the user's data should be routed to. By specifying the DNN, the 5G network knows how to handle and direct the data traffic from the device to the correct destination outside of the 5G core network, applying the right routing rules, security policies, and quality of service parameters for that session. It's a key element in managing how data is transmitted within the highly versatile and service-oriented architecture of 5G networks.

The use of DNNs enables the 5G network to support multiple data networks and services simultaneously, allowing for a wide range of applications and use cases, from standard internet access to specialized services tailored for specific industries or user needs.

Further Readings

• DNN/LADN