5G Core Architecture Duration: 3 days

5G Core Architecture

CONTENTS

This course presents the 5G System (5GS) as defined by 3GPP, focusing on the functionalities of the 5G core (5GC) network. The relevant basics of NG-RAN are also covered. Roles of the Network Functions (NFs) as specified in the current 3GPP R15 standards are discussed, including the interactions both within the 5GC and between the 5GC and the NG-RAN.

The training explains the challenges the 5GS faces from the huge variety of services it will carry, and presents the new network features that are the tools to enable the 5GS to satisfy the various service requirements in an optimal and cost-efficient way: Service Based Architecture approach with specialized NFs, Network Slicing, User Plane Splitting, hosting services closer to the user, traffic influencing from external AFs, and the 5G PCC model used to enforce service-specific handling rules. The course presents how the 5GC enables the different types of UEs to access services, discussing the 5G Registration, the PDU Session Establishment traffic cases, User Plane resources definitions and handling, UE mobility handling, and the three basic 5G use cases (eMBB – including Vo5G, MIoT/mMTC, URLLC).

The presented 5G Core and NG-RAN network features are used as a basis to discuss various deployment scenarios for evolving the EPS network into 5G.

PREREQUISITES

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

5G System overview

  • Service Based Architecture model for 5GC
  • Introduction of the main 5GC NFs: AMF, SMF, UPF, UDR, UDM, AUSF, NEF, PCF, NSSF, NRF, SEPP
  • Introduction of the NG-RAN: gNB, N3IWF for WiFi
  • 5GS Interfaces
  • Reference Point model of the 5GS for non-roaming and roaming scenarios (both LBO and HR options)
  • LTE, WiFi and fixed access in the 5G ecosystem
  • 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
  • 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
  • Vo5G as a service within the eMBB Network Slice

Policy and Charging Control (PCC) overview

  • Definition of PCC
  • 5G requirements on PCC
  • Access and Mobility handling for a UE using AM Policy Associations
  • QoS handling for PDU Sessions using SM Policy Associations and N4 Sessions

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 NAS Protocol on N1: 5GMM

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
  • 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

AF Service Influencing

  • Mechanisms for the external AFs to control access, QoS and routing of application data over 5GS
  • Packet Flow Description Function (PFDF) role on defining and enforcing AF-specific QoS handling
  • User Plane Splitting: multiple N6 interfaces for service-specific traffic steering
  • Network Exposure Function (NEF) role in the interactions between 5GC and external NFs

NG-RAN Overview

  • Definition of RRC States in 5G: RRC_Idle, RRC_Connected, RRC_Inactive
  • Idle mode mobility handling: Paging for RRC_Idle and RRC_Inactive UEs, CN Assistance Information for the NG-RAN, Connection Suspend/Resume procedures
  • Connected mode mobility handling: Handovers

4G  –> 5G evolution

  • RAN: Dual Connectivity deployment options: Stand-alone and non-standalone NR
  • CN: Combined EPC/5GC deployment option
  • R14 5G options: 3/3a/3x, 4/4a, 5 and 7/7a/7x
  • Early 5G deployments (option 3x)
  • Protocol on N2: NGAP (options 2 and 4/4a)

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