Because the NSA standard is six months earlier than the SA standard, and terminals support the same pace, most operators select the NSA standard to deploy 5G networks in the early stage of global 5G deployment. Although NSA deployment can accelerate the commercial use of 5G, NSA technology limitations restrict the full development of 5G service potential. Slicing, new QoS mechanisms, and better network performance all require ultimate standard SA. However, the direct change from NSA to SA results in the failure of early-stage NSA terminals to work in SA networks, greatly affecting the construction and promotion of 5G.
