LADN (Local Area Data Network) and DNN (Data Network Name) are both integral components of the 5G network architecture, and they are related in the way they facilitate connectivity and service delivery. Here's how they interact within the 5G ecosystem:

• LADN is focused on providing localized network services within a confined geographical area, such as a factory, campus, or enterprise site. LADNs are designed to ensure high-quality connectivity for specific applications or services that require low latency, high bandwidth, or both. By restricting access to users physically present in the defined area, LADN optimizes network resources and performance for locations where these demands are particularly high. This is especially useful for mission-critical applications, IoT deployments, or private networks where data needs to remain local for security or efficiency reasons.
• DNN, on the other hand, serves as an identifier for the data network a user's device (UE) is trying to access through a PDU session. It is similar to the APN (Access Point Name) in 4G networks. The DNN specifies the destination network for the data traffic, guiding the 5G core network in routing this traffic to the correct external network or service. Each DNN can represent a different service, such as internet access, enterprise intranet, or a specific application network.
• The relationship between LADN and DNN becomes evident when a user within a LADN area initiates a PDU session. The DNN associated with that session will specify the local data network (LADN) as the destination. This ensures that the data traffic is optimally routed, taking advantage of the dedicated resources and enhanced connectivity features provided by the LADN. The network checks the user's location and only allows the PDU session to the LADN DNN if the user is within the LADN service area.
• Essentially, the DNN acts as the link that connects the user's PDU session to the specific LADN, enabling the network to apply the correct routing and service policies. This allows users within a LADN area to enjoy the benefits of localized, high-performance network services tailored to specific needs. If the user moves outside the LADN area, the PDU session to that DNN is deactivated, ensuring that access to the local network is strictly controlled.
• From a configuration perspective, network operators define LADNs by associating specific DNNs with geographical areas in the 5G core network. The UE is informed about available LADNs and their corresponding DNNs during registration or via network signaling, so it knows which services are accessible based on its current location.
• Use cases for LADN and DNN integration include smart manufacturing (where machines need fast, local connectivity), enterprise campuses (with private data networks), and venues requiring temporary, high-performance local services (such as stadiums or event sites).

In summary, while LADN focuses on the localized optimization of network services, DNN facilitates the connection to these services by identifying the LADN as the destination for user data traffic. Together, they enhance the 5G network's ability to deliver specialized, high-quality services where they are most needed, while maintaining strict control over access and resource allocation.

Further Readings

• DNN/LADN