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In order to provide the general context the course briefly introduces the overall roles of all the major 5G Network Functions (NFs), and the outline of the basic 5G traffic cases – the 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. A short part on the 5G Charging Control is included.
This course also exists as a shorter one hour version.
A brief 5G System introduction
- Introduction of the main 5G network elements: 5G-AN, AMF, SMF, UPF, UDR, UDM, AUSF, NEF, PCF, NSSF, NRF, SCP, SMSF, NWDF, CHF, SEPP
- NG-RAN with NR, WiFi and fixed accesses
- Service Based Architecture model for the 5G Core including the definitions of Network Functions, NF Services, 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, 5G-GUTI
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
Access and Mobility Management Policies in 5G PCC
- An outline of the Initial 5G Registration traffic case
- Definition of a UE Registration Area
- Negotiation of service-specific features and capabilities at Registration: MICO mode, LADN, UE Reachability, Mobility Patterns, Mobility restrictions
- AM Policy Associations between the PCF and the AMF
- A detailed look into policy-related parameters for Access and Mobility Management: AM Policy Info, AM Policy Control request Triggers, ANDSP, URSP
User Plane resources in 5G
- Definition of a PDU Session, Service Data Flows, QoS Flows and their relationships to PDU Sessions, Data Radio Bearers and N3 Tunnels
- PDU Session routing principles: PDU Sessions with Multiple PDU Session Anchors, UPF/PSA relocation, edge computing using ETSI MEC
- QoS parameters: 5QI, QoS Flow parameters
Session Management in 5G PCC
- An outline of a PDU Session Establishment traffic case
- 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
- Definitions of QoS Rules, QoS Profiles, PCC Rules
- SM Policy Associations between the PCF and the SMF
- Definitions of Packet Detection Rules, QoS Enforcement Rules, Forwarding Action Rules, Usage Reporting Rules, Session Reporting Rules
- SMF control of UPF over the N4 interface
- Packet handling in the UPF
- Session-related parameters provided to the gNB and the UE
AF Service Influencing
- Mechanisms for the external AFs to control access, QoS, routing and charging of application data over 5GS
- Routing principles for service-specific traffic steering
- Network Exposure Function (NEF) role in the interactions between 5GC and external NFs
- NEF capabilities: Provisioning, Monitoring, Policy/Charging, Analytics Reporting
- NWDAF functionalities and defined analytics
- BSF role and functionality
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
- An overview of charging-related messages and parameters
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