Why is the NSA model still the first choice for 5G in various countries at the current stage?

On June 6, the Ministry of Industry and Information Technology officially issued 5G commercial licenses to China Mobile, China Unicom, China Telecom and China Radio and Television. my country has also officially entered the first year of 5G commercial use.

The first year of commercial use means the beginning of an era. For individual users, it means updates to mobile devices.

Many users have begun to care about the technical issues of 5G networks. According to the original development rules of 4G, this process will take at least several years from the issuance of commercial licenses to trial commercialization to large-scale commercialization and coverage. This involves a key point: What kind of networking method should 5G adopt?

To put it simply, 5G currently has two networking methods, one is Non-Standalone (NSA for short) and the other is Standalone (SA for short). An interesting phenomenon is that the networking method that was rarely discussed in the 4G era has become a hot topic now that 5G is ready for commercial use. The reason is that the two 5G deployment modes, non-standalone networking and independent networking, have great differences. the difference.

So, what are Non-Standalone (NSA) and Standalone (SA)? Here is a simple "chestnut" to help you understand.

Suppose there is a real estate developer whose real estate sales are very hot. Many people come to view and buy houses every day, making a lot of money. However, enterprises are based on profit-seeking, and making money is never too much, so this developer plans to expand the property, but this will consume a lot of manpower and material resources, and investment cannot be made blindly, so the following two plans are thought of:

Option 1: Build a new building near the original building, and transfer sales staff and property management companies from the original building. This option can save construction costs and labor costs;

Option 2: Go to a new building Develop new properties in a brand new city, and re-recruit sales staff and property management companies. This plan is relatively more "burning money", but it may also be more popular than the original properties.

In the above example, option one corresponds to non-standalone networking (Non-Standalone, NSA), while option two corresponds to standalone networking (standalone, SA).