Unlike previous generations of mobile networks, the deployment of 5G does not require the simultaneous implementation of the 5G core network (5GC) and the NG-RAN (Next-Generation Radio Access Network).
NSA (Non-Standalone Access) and SA (Standalone Access) are two 5G network models:
– SA is a completely new core service-based architecture: each radio node is autonomously controlled by the 5G core network. A service-based architecture delivers services as a set of NFs (Network Functions). NFs in the 5G core network are cloud native;
– NSA relies either on the 4G core network or on the 5G core network. NSA anchors the control signaling to the core network through a radio MN (Master Node). The MN is either a 4G radio node or a 5G radio node. The MN controls an SN (Secondary Node) (4G radio node or 5G radio node) according to the DC (Dual Connectivity) mechanism.
The 5G-SA architecture requires the deployment of a 5G core network connected to the NG-RAN.
The 5G-NSA architecture and the 5G-SA architecture were introduced in Release 15 of the 3GPP standard.
The 5G-NSA configuration implements the MR-DC (Multi Radio Dual Connectivity) architecture.
Figure 1.1.Deployment in the SA mode
Dual connectivity involves two RAN nodes, i.e. master node (MN) and secondary nodes (SN) which has the following features: ...
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