- Understand APN/DNN roles
- Distinguish VPN isolation from network slicing
- See how QoS predates 5G
APNs and private data networks
Mobile operators have long used APNs to connect devices to particular packet data networks. Enterprise APNs can provide private addressing, controlled internet breakout, fixed IP options or links into corporate networks. In 5G, the related concept is the Data Network Name, or DNN.
QoS already existed
4G networks could classify traffic and apply different bearers, priorities and bandwidth treatment. That means network slicing did not invent differentiated service. What 5G adds is a broader, service-based framework capable of coordinating differentiation across more of the end-to-end system.
What slicing adds
Slicing can combine subscription authorisation, slice selection, Core function choice, user-plane placement, RAN policy, assurance and lifecycle management. An APN or VPN addresses only part of that chain.
Knowledge check
What is the best description of slicing versus an APN?