Access and Mobility Management Function(AMF)

AMF terminates the control plane of different access networks onto the 5G Core Network(5GC) and control which UEs can access the 5GC to exchange traffic with DNs. It also manages the mobility of UEs when they roam from one gNB to another for session continuity, whenever possible.
Access and Mobility Management Function(AMF)
Key Benefits
Converged EPC MME and 5GC AMF core network function
Perfect compatibility with third-party core network elements
Deployed on X86 COTS server, NFV platform and Cloud 
Enabled for centralized or distributed data centers
 
IPLOOK's  5GC  AMF
IPLOOK 5GC AMF supports registration management, access control and mobility management function for all 3GPP accesses as well as non-3GPP accesses such as WLAN. AMF also receives mobility related policies from PCF (e.g. mobility restrictions) and forwards them to the UE. AMF fully supports 4G interoperability with the interface to 4G EPC MME node.
Assuming the responsible for mobility management, the AMF is in charge for managing handovers between gNodeB’s (gNB’s), within the Next Generation Radio Access Network (NG-RAN). Formally referred to as an X2 handover, in 5G it is termed an Xn handover. This represents the updated reference interface application protocol (XnAP) employed between gNB base stations, which is defined within the 3GPP’s Technical Specification (TS) 38.423.
Features 
 
Comply to  3GPP R15/R16 Standards
Interface Function
»  S6a/S6d Interface
»  N1 Interface
»  N2 Interface
»  N8 Interface
»  N11 Interface
»  N12 Interface
»  N14 Interface
»  N15 Interface
»  N22 Interface
»  N26 Interface
»  Web Server
Mobility Management
»  Registration
»  UE-initiated Deregistration
»  AMF-initiated Deregistration
»  UDM-initiated Deregistration
»  Mobility Registration Update
»  Periodic Registration Update
»  UE triggered Service Request
»  Network Triggered Service Request(Paging)
»  RAN  Configuration Update
»  N2 release procedure
»  Xn-based handover 
»  Intra AMF N2-based handover 
»  Inter AMF N2-based handover 
»  Location Report
»  UE Configuration Update
»  AMF Configuration Update
»  5GS to EPS  Handover(Idle State)
»  EPS to 5GS  Handover(Idle State)
»  5GS to EPS  Handover(Connect State)
»  EPS to 5GS  Handover(Connect State)
»  EPS bearer ID allocation
»  AM Policy Control
»  UE Policy Control
»  MICO Mode
»  AMF Reallocation
»  Network Slice Selection
Element Management System(EMS) supported
 
Session Management
»  PDU session establishment
»  PDU session modification
»  PDU session release
Operation and Maintenance
»  KPI Management
»  Fault Management
»  Log Management
»  Configuration Management
»  License Management
»  CLI
»  Remote Operation and Maintenance 
»  SFTP
»  Stelnet
»  Telnet
»  Daylight Saving Time
»  Online Support
»  Online Loading
»  SSH
»  Availability
Security Management
»  NAS Security Mode Command
»  The authentication and key agreement(5G AKA)
»  User Identity Confidentiality
»  GUTI Reallocation 
»  User Data and Signalling Confidentiality
Network Function Management
»  NF Register
»  NF Deregister
»  NF Subscription
»  Access Token
Open Northbound interface and graphical web based management interface
»  RESTful
»  API
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Base on Service Based Architecture(SBA), in 5GC, a cloud native design is introduced to enable flexible scaling and upgrades.
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The UPF plays the most critical role in the process of data transfer. It provides the interconnect point between the mobile infrastructure and the Data Network (DN), i.e. encapsulation and decapsulation of GTP-U.
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By opening the network capability to third-party applications, it can realize the friendly connection between network capability and business requirements, improve business experience and optimize network resource allocation.
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Learn More
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Network slicing is a key native capability of 5G that can maximize the performance of communication networks and reduce network construction and operation and maintenance costs, and it has become an industry consensus that "slicing is capability and slicing is product" in the 5G era.
The core network, as a key anchor point for network differentiation and operation, has emerged as a more important network in the 5G era, providing the ability to deploy network functions and resources on-demand to meet the diverse business needs of future vertical industries.
Learn More
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UDM: The same as 4G’ s HSS (Home Subscriber Services), UDM is a centralized way to process network user data in 5G through Nudm interfaces to provide services for AMF, SMF, SMSF, AUSF, NEF and GMLC. It also provides services such as authorization of accessing, registration, uninterrupted services.

AUSF: As a major part of 5GC to facilitate security processes, AUSF performs the authentication function of identifying UEs and storing authentication keys.
Learn More
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The 5G PCF performs the same function as the PCRF in 4G networks.

• Provides policy rules for control plane functions. This includes network slicing, roaming and mobility management.
• Accesses subscription information for policy decisions taken by the UDR.
• Supports the new 5G QoS policy and charging control functions.
Learn More
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SMF is a fundamental element of the 5G Service-Based Architecture (SBA). The SMF keeps trace of PDU sessions and QoS Flows in the 5GC for UEs and make sure their states and status are in sync between Network Functions in Control and User Planes.
It also receives PCC (Policy and Charging Control) Rules from PCF (Policy Charging Function) and convert PCC Rules into SDF Templates, QoS Profiles and QoS Rules for UPF, gNB and UE respectively for QoS Flows establishment, modification and release etc.
Learn More
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