Virtual Classroom Training

€ 2410 *


€ 2410 *


€ 1680 *
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Course outline

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In just three days we cover 5GS (the 5G System), as defined by 3GPP (3rd Generation Partnership Project), with focus on the functionality of the 5GC (5G Core) network. 

We introduce the relevant basics of NG-RAN (Next-Generation Radio Access Network) together with the roles of the various NFs (Network Functions), as defined by current 3GPP R15 standards and emerging R16 additions. The interactions both within the 5GC and between the 5GC and the NG-RAN are also explained.

How you will benefit

Participants will receive information regarding the wide range of novel technical concepts and solutions of the 5G core: 

  • 5G core architecture: an extensive but in-depth understanding of the benefits of the 5G core design concepts 
  • The 3GPP approach: different logical networks for different customers helping a mobile operator to optimally design their network to target their specific market segments 
  • The Service-Based Architecture design approach: the benefits and the challenges of initial deployment of the 5G core with future evolution options 
  • The new 5G User Plane features: the new 5G tools that make transportation using 5G technology attractive for various verticals


Technical knowledge of the EPS system is crucial – the 5G features are discussed in relation to the existing 4G ones. To facilitate following the course we also recommend an Apis’ “5G System Overview” recorded module for introductory knowledge on 5G.


5G System overview

  • Rationale behind the 5G definitions: support for various services and applications
  • Requirements for the 5GS
  • Service Based Architecture model for the 5GC
  • Introduction of the 5GC NFs: AMF, SMF, UPF, UDR, UDM, AUSF, NEF, PCF, NSSF, NRF, UCMF, BCF, NSSAAF and other 5GC network elements: SCP, SEPP
  • 5GS Interfaces
  • Reference Point model of the 5GS for non-roaming and roaming scenarios (both LBO and HR options)
  • UE identities in 5G: SUPI, SUCI, GPSI, PEI, etc.

Service Based Architecture (SBA)

  • Definitions of Service Based Interface, Network Function (NF), NF Service, Service Producer and Service Consumer
  • NF Registration, Discovery and Selection procedures
  • Inter-operator interconnect border functionalities: SEPP, IPUPS
  • SBA Security: Access Tokens and the role of the NRF
  • Protocol on the SBI: http/2

Network Slicing

  • Definition of a Network Slice
  • Identifiers of Network Slices: NSI Id, NSSAI, S-NSAAI
  • NFV as a tool to implement Network Slicing
  • Rules and mechanisms for allocating a Network Slice for a UE: slice-specific information used at 5G Registration and PDU Session Setup
  • Main 5G use cases (eMBB, MIoT, URLLC) realized as separate Network Slices

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, Mobility Restrictions
  • Access and Mobility NAS Protocol on N1: 5GMM

Policy and Charging Control (PCC) overview

  • Definition of PCC
  • 5G requirements on PCC
  • Comparison of the PCF vs the 4G PCRF
  • Access and Mobility handling for a UE using AM Policy Associations
  • QoS handling for PDU Sessions using SM Policy Associations and N4 Sessions
  • Policy influencing from external AFs

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
  • Routing-specific definitions in the 5GC: PDU Session Anchors (PSAs), UPF chaining, PDU Sessions with Multiple PDU Session Anchors, User Plane splitting, Multi-Access Edge Computing (MEC), Local Area Data Networks (LADN)
  • SMF control of UPF over the N4 interface
  • Session Management NAS Protocol on N1: 5GSM
  • Protocol on N4: PFCP
  • Protocol on N3 and N9: GTP-U ver.1

5GC ↔ AF Interactions: Service Influencing

  • Mechanisms for the external AFs to control access, QoS and routing of application data over 5GS
  • Packet Flow Description Function (PFDF) role in defining and enforcing AF-specific traffic handling rules
  • Network Exposure Function (NEF) role in the interactions between 5GC and external NFs
  • IMS network elements as 5G AFs
  • Vo5G as a service within the eMBB Network Slice

5GC ↔ NG-RAN Interactions

  • LTE, WiFi and fixed access in the 5G ecosystem
  • Introduction of the network elements of the different Access Networks to the 5GC: eNB, gNB, N3IWF, TNGF, W-AGF, 5G-RG
  • Non-Standalone and Standalone deployment options
  • Definition of RRC States in 5G: RRC_Idle, RRC_Connected, RRC_Inactive
  • The impact of different RRC States on N2 Connection handling
  • Protocol on N2: NGAP

5GC ↔ EPC Interactions

  • N26 interface for MME ↔ AMF communication
  • Single- and Dual-Registration modes for the UEs
  • Combined EPC/5GC Network Architecture
This course presents the 5G System (5GS) as defined by 3GPP, focusing on the functionalities of the 5G core (5GC) network.

Interested in 5G Core Network Architecture?

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5G Core Network Architecture

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