On June 6, 2019, the Ministry of Industry and Information Technology issued 5G licenses to China Mobile, China Telecom, China Unicom and China Radio and Television, which means that China officially entered the 5G commercial year. Unlike China Radio and Television, which can only use SA networking, the other three major operators can have more choices in 5G network deployment. However, no matter which construction method is adopted, the SA network supporting high reliability, low latency and large connection is the final form of China's 5G network. In July of this year, the Ministry of Industry and Information Technology required that mobile phones that entered the network in 2020 must support both NSA and SA. Only mobile phones that support NSA are not allowed to access the network. This also shows the attitude of the government in supporting 5G SA networking. The R16 standard is expected to be completed in March 2020. It takes nearly one year for each equipment manufacturer to develop and test. It takes time for operators to deploy the entire network. In the 4G era, it took nearly four years for operators to build a boutique network. According to the 4G network construction speed, the 5G license has just been released, and it takes at least three years to achieve nationwide coverage. Therefore, at present, China's operators choose to smoothly transition from the NSA network to the SA network, or directly adopt the SA network. The 5G network supporting high reliability, low latency and large connection should be basically built before 2023