AMF is mainly responsible for access and mobility management in 5G system; it is a core network component in 5G, in addition to being responsible for managing the access and mobility of 5G devices, it also interacts with other network function units (such as UPF, SMF, and AUSF) to complete the identity authentication of the terminal equipment (UE), service application, and billing, etc. The main functions of AMF itself are as follows:
⒈、Device registration:AMF is responsible for registering 5G devices with the network and assigning unique identifiers to them, allowing the network to track the devices and their locations.
⒉、Access Management:The AMF performs access management functions such as authentication, authorization and accounting (AAA) for 5G devices. It verifies the identity of the device and determines whether it is authorized to access the network.
⒊、Mobility management:The AMF tracks the location of the device and manages switching between cells and base stations. It ensures that the device stays connected as it moves through different areas of the network.
⒋、Policy enforcement:AMF enforces network policies. For example, quality of service (QoS) and charging policies, it ensures that network resources are appropriately allocated and devices are correctly charged for the services they use.
⒌、Session Management:The AMF manages the creation, modification, and termination of 5G sessions for devices. It coordinates with other network functions such as the Session Management Function (SMF) to ensure that sessions are set up correctly and resources are allocated appropriately.
⒍、User-Plane Function Unit (UPF) Selection: The AMF selects the appropriate UPF based on network policy and device location, and is responsible for forwarding user data between the device and the network.
⒎、Subscriber data management: AMF stores and manages subscriber data, such as device profiles, subscription data and service data, to allow the network to provide personalized services for the device.
⒏、Security Management:The AMF is responsible for ensuring the security of 5G devices and networks; handling security functions such as key management, authentication and encryption.
⒐、Network Slicing:The AMF plays a key role in network slicing, allowing the network to create virtualized network segments with dedicated resources and services for different use cases.The AMF is responsible for managing access and mobility of devices within each network slice.
⒑、Network Integration:The AMF is responsible for integrating the 5G core network with external networks (e.g., 4G LTE networks or Wi-Fi networks). It is responsible for coordinating with other network functions to ensure seamless switching between different networks.
⒒、Control Plane Management: The AMF manages the control plane of the 5G network, which is responsible for signaling and network management. This plane is responsible for signaling and network management. It ensures that signaling messages are correctly transmitted between network functions and that network resources are effectively managed.
⒓、Fault Management: The AMF is responsible for detecting and managing faults within the 5G core network; monitoring network anomalies and alerting the network operator when faults are detected.
⒔、Policy Control:AMF is responsible for enforcing policies related to network resource allocation, quality of service (QoS) and billing. To ensure that the correct application of policy and appropriate charges to the device based on the services used by the device.
⒕、Location Management:The AMF is responsible for tracking the location of 5G devices and managing their mobility to ensure that they remain connected as they move through different areas of the network.
⒖、Network Optimization:The AMF plays a key role in optimizing the performance and efficiency of the 5G network. It monitors network usage and adjusts network resources to meet device demands.
