5G commercial launch has begun all over the world, with 2019 recognized as the first year of 5G NSA commercial launch and 2020 as the first year of 5G SA commercial launch. Compared with 4G, 5G SA aims to achieve internet of everything (IoE). Therefore 3GPP defined three major scenarios: eMBB, uRLLC and mMTC, to enable man-to-man, man-to-thing and thing-to-thing communications. The new goal raises new requirements for 5G core networks. 5G SA Core needs to be more accurate, intelligent, flexible and simple.
