5G Tutorial
5G Introduction
5G Network Function
5G Network Function Service
5G Definitions
5G Concepts
Architecture Reference
Data Storage Architectures
Non-3GPP Access
Non-3GPP Access Reference Points
Network Analytics architecture
Network Access Control
Http Status Codes
Http Custom Headers
Common Data Types
Service Based Architecture
Network Functions
Reference Points
Reference Points
Protocol Errors
Http Mandatory Headers
AMF Function
AMF Functional Description
AMF Specifications
AMF Services
SMF Function
SMF Functional Description
SMF Specifications
SMF Services
UPF Function
UPF Functional Description
PCF Function
PCF Functional Description
PCF Specifications
NEF Function
NEF Functional Description
NEF Specifications
NRF Function
NRF Functional Description
NRF Specifications
UDM Function
UDM Functional Description
UDM Specifications
AUSF Function
AUSF Functional Description
AUSF Specifications
N3IWF Function
N3IWF Function Description
Application Function
Application Functional Description
UDR Function
UDR Functional Description
UDR Specifications
UDSF Function
UDSF Functional Description
SMSF Function
SMSF Functional Description
SMSF Specifications
NSSF Function
NSSF Functional Description
NSSF Specifications
5G-EIR Function
5G-EIR Functional Description
5G-EIR Specifications
LMF Function
LMF Functional Description
LMF Specifications
SEPP Function
SEPP Functional Description
NWDAF Function
NWDAF Functional Description
NWDAF Specifications
Data Types

5G General Concepts

The 5G System architecture is defined to support data connectivity and services enabling deployments to use techniques such as e.g. Network Function Virtualization and Software Defined Networking.

The 5G System architecture shall leverage service-based interactions between Control Plane (CP) Network Functions where identified.

Key Principles and concepts

Separate the User Plane (UP) functions from the Control Plane (CP) functions, allowing independent scalability, evolution and flexible deployments e.g. centralized location or distributed (remote) location.

Modularize the function design, e.g. to enable flexible and efficient network slicing.

Wherever applicable, define procedures (i.e. the set of interactions between network functions) as services, so that their re-use is possible.

Enable each Network Function to interact with other NF directly if required. The architecture does not preclude the use of an intermediate function to help route Control Plane messages (e.g. like a DRA).

Minimize dependencies between the Access Network (AN) and the Core Network (CN). The architecture is defined with a converged core network with a common AN - CN interface which integrates different Access Types e.g. 3GPP access and non-3GPP access.

Support a unified authentication framework.

Support "stateless" NFs, where the "compute" resource is decoupled from the "storage" resource.

Support capability exposure.

Support concurrent access to local and centralized services. To support low latency services and access to local data networks, UP functions can be deployed close to the Access Network.

Support roaming with both Home routed traffic as well as Local breakout traffic in the visited PLMN.


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