Solution:
NSA is also called "non-independent networking". It is currently the main way for global operators and mobile phone manufacturers to implement 5G networks. It can be understood that the 4G core network remains unchanged. The 5G network is realized by changing the base station to a 5G base station. into the low present, quick deployment speed, a relatively mature technology and other characteristics; SA also called the "network independent", i.e. from a base station to a core network 5G technologies are used, independent networking standards established later, and terminal and the user takes a long The time is cut from 4G to 5G, so the 5G networks established by operators around the world are NSA, -independent networking networks.