In order to provide the general context the training briefly introduces the overall roles of all the major 5G Network Functions (NFs), the three basic 5G use cases (eMBB, MIoT/mMTC and URLLC), as well as an overview of the fundamental 5G signalling procedures (5G Registration and PDU Session Establishment).

The course focuses on the 5G Policy Control Function (PCF), explaining the Policy Control model used to enforce both the subscription-specific Access and Mobility Management and the service-specific QoS, routing and charging handling rules. 3GPP definitions for User Plane resources are presented, as well as external AF traffic influencing.


Technical knowledge of the EPS system is crucial – the 5G features are discussed in relation to existing 4G features and concepts. Both a general 5G System knowledge, and prior exposure to the 4G PCC environment with the PCRF would be highly beneficial. We strongly recommend APIS’ 5G System Overview to provide an overall orientation in the 5G ecosystem.

Note: This course is under development and the content may be subject to changes.

A brief 5G System introduction

  • Introduction of the main 5G network elements: gNB, N3IWF, AMF, SMF, UPF, UDR, UDM, AUSF, NEF, PCF, NSSF, NRF, SCP, SMSF, NWDF, CHF, SEPP
  • NG-RAN with NR and WiFi accesses
  • Service Based Architecture model for the 5G Core including the definitions of Network Functions, Service Producers and Service Consumers
  • The 5G Reference Point model for non-roaming and roaming scenarios (LBO and HR options)
  • 5G protocol stacks
  • Basic communication principles for the SBA
  • UE identities in 5G: SUPI, SUCI, GPSI, PEI, etc.

Overview of the 5G Network Slicing

  • Definition of a Network Slice
  • Main 5G use cases (eMBB, MIoT, URLLC) realized as separate Network Slices
  • Vo5G as a service within the eMBB Network Slice
  • Identifiers used for slice selection: NSI Id, S-NSSAI, NSSAI

5G Policy Control overview: the role of the PCF

  • Definition of the 4G PCC
  • 5G requirements on Policy Control
  • Comparison of the 4G and the 5G Policy Control
  • Npcf services
  • Various sources of information for the PCF: AF, NEF, UDR, SMF, AMF and the parameters defined in the standards for all these information streams
  • The roles of the vPCF and the hPCF in roaming scenarios

5G Registration procedure

  • Definition of types of Registration procedures: Initial, Mobility Update, Periodic Update
  • Definition of a UE Registration Area
  • Signalling flow with basic parameters for Access and Mobility enforcement, AF selection, Network Slice selection and creation of relevant UE contexts
  • Negotiation of service-specific features and capabilities at Registration: MICO mode, LADN, UE Reachability, Mobility Patterns
  • Access and Mobility handling for a UE using AM Policy Associations between the PCF and the AMF

User Plane resources in 5G

  • Definition of a PDU Session
  • Signalling flow with basic parameters for AF selection, session QoS and routing enforcement and creation of relevant UE contexts
  • Definitions of Service Data Flows, QoS Flows and their relationships to PDU Sessions, Data Radio Bearers and N3 Tunnels
  • Definitions of QoS Rules, QoS Profiles, PCC Rules, SDF Templates
  • PDU Session routing principles: PDU Sessions with Multiple PDU Session Anchors, UPF/PSA relocation, edge computing using ETSI MEC
  • Various NFs receiving information and orders from the PCF: SMF, AMF, UPF, gNB, UE, and the parameters defined in the standards for all these information streams
  • PDU Session handling using SM Policy Associations between the PCF and the SMF and the N4 Sessions between the SMF and the UPF
  • SMF control of UPF over the N4 interface
  • QoS parameters: 5QI, QoS Flow parameters
  • Definitions of QoS Enforcement Rules, Forwarding Action Rules, Usage Reporting Rules
  • Protocol on N4: PFCP

AF Service Influencing

  • Mechanisms for the external AFs to control access, QoS, routing and charging of application data over 5GS
  • Packet Flow Description Function (PFDF) role on defining and enforcing AF-specific QoS handling
  • Routing principles for service-specific traffic steering
  • Network Exposure Function (NEF) role in the interactions between 5GC and external NFs

5G Charging overview: the role of the CHF

  • Roles and definitions of the Network Functions used for charging in 5G: CHF, OCS, CDF, CTF, CGF, ABMF, RF
  • Nchf services: Converged Charging, Offline Only Charging, Spending Limit Control
  • Relevant Interfaces and Protocols

Duration: 2 days


Classroom training: € 1730

Virtual classroom training: € 1730

We offer substantial discounts for group bookings, and we have corporate rates with most of the operators and equipment suppliers in the world.

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