In the 5G era, mobile communication experiences man-to-man communication, man-to-thing communication, and machine-to-machine. AR/VR, IoT, industry automation, unmanned driving etc services are introduced widely. Thus come lots of network requirements, i.e. high bandwidth, low delay and massive connections, which are three 5G scenarios defined by 3GPP.
In order to meet above-mentioned requirements, more and more NEs start to separate control planes from forwarding planes, perform hierarchical deployment and centralized dispatch of control planes, user planes are distributed near the users, so as to realize the balancing between management costs and user experience.