name: NSA
full_form: Non Stand-Alone
context: the following figure. Figure 5.3.2-1: The NSA Architecture The NSA architecture can be seen as a temporary step towards "full 5G" deployment, where the 5G Access Network is connected to the 4G Core Network. In the NSA architecture, the (5G) NR base station (logical node "en-gNB") connects to the (4G) LTE base station (logical node "eNB") via the X2 interface. The X2 interface was introduced prior to Release 15 to connect two eNBs. In Release 15, it also supports connecting an eNB and en-gNB as to provide NSA. The NSA offers dual connectivity, via both the 4G AN (E-UTRA) and the 5G AN (NR). It is thus also called "EN-DC", for "E-UTRAN and NR Dual Connectivity". In EN-DC, the 4G's eNB is the Master Node (MN) while the 5G's en-gNB is the Secondary Node (SN). This is explained in detail on the dedicated section on NSA of this present document. The SA architecture is illustrated in the following figure. Figure 5.3.3-1: The SA Architecture The SA architecture can be seen as the "full 5G
description: Non-Stand-Alone (NSA) is a transitional phase in 5G network deployment where the 5G Access Network connects to the existing 4G Core Network. This architecture allows dual connectivity through both 4G and 5G access networks, known as E-UTRAN and NR Dual Connectivity (EN-DC).
explanation: NSA is a specific technological approach used in the deployment of 5G networks. It describes a technical standard and its implementation within telecommunications infrastructure.
section_title: 5.3.2	The NSA versus SA architecture
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