Compared with 4g5g, it redefines which network elements ngc mainly includes.

Compared with 4G, 5G redefines the main network elements of NGC, including key network elements such as AMF (access and mobility management function), SMF (session management function) and UPF (user plane function).

The 5G core network NGC reconstructs the structure of the traditional 4G core network. AMF is responsible for access and mobility management functions, managing user equipment with different mobility requirements, and handling NAS signaling, security tasks and signaling between core network nodes. SMF and AMF cooperate to support customized mobility management scheme, and perform session management, IP address allocation, UPF selection and control. As a user plane function, UPF is responsible for packet processing, mobile anchor points inside and outside the system, PDU session point connection and data routing and forwarding. The redefinition and re-planning of these network elements make the 5G core network more adaptable to the new application requirements and the challenges of large-scale connection.