5G System Engineering

5G is the next enhancement in mobile communications. This course introduces 5G technology in terms of the current 3GPP roadmap and network deployment by 2020. In so doing, an end to end view of the 5G system is examined, including the new architecture requirements for 5G. In addition, key aspects of the new 5G air interface are also introduced. The course then takes a “day in the life” approach to the 5G handset, detailing typical activities such as Registration, Security, PDU Session Establishment, Mobility and Interworking.

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Section 1 - 5G Concepts and Drivers
Section 2 - 5G System Architecture
Section 3 - 5G New Radio and NG RAN
Section 4 - Non Standalone Operation
Section 5 - 5G Initial Procedures
Section 6 - 5G Security
Section 7 - Exchanging Data in 5G
Section 8 - 5G Mobility
Section 9 - Interworking with LTE and Wi-Fi

Topic areas covered include:

  • Driving Factors for 5G:
    • 3GPP Smarter, ITU-R requirements.
    • eMBB, URLLC, MIoT.
    • Performance requirements.
  • 5G Standardization:
    • IMT-2020.
    • 5G Technology Roadmap.
  • 5G Use Cases:
    • 5G Small Cells.
    • 5G Based Backhaul.
    • 5G for Fixed Wireless Access.
  • Key Trends Associated with 5G.

Topic areas covered include:

  • High Level Architecture:
    • 5G RAN Architecture (detailed functionality of RAN functions and reference points):
      • UE, ng-eNB, gNB.
      • Xn, N2, N3.
    • 5G Tracking Areas.
    • 5G RAN Deployment Options.
  • 5G Core Architecture (detailed functionality of 5GC functions and reference points):
    • AMD, SMF, UPF, UDM, AUSF, PCF, AF, Data Network.
    • N1, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N35, N36, N37.
  • 5G Service Based Architecture:
    • Network Functions Virtualization.
    • SBA Model.
    • Core Network API usage.
    • Positioning SBA APIs:
      • Nnssf, Nausf, Nnef, Namf, Nnrf, Nsmf, Npcf, Nudsf, Nudm, Nchf, Naf.
    • Complimentary Network Functions for SBA:
      • UDSF, CHF, NRF, NEF.
  • Network Slicing:
    • Network Slicing Architectural Considerations:
      • Functionality, Performance, User Groups.
      • S-NSSAI Composition.
      • NSSF, NWDAF.
    • Network Slicing Overview of Operation.
  • Multi-Access Edge Computing.

Topic areas covered include:

  • New Radio Air Interface:
    • New Radio Multiple Access – CP-OFDM:
      • Frame Structure.
      • Variable Subcarrier Spacing.
    • Higher Order Modulation:
      • 256QAM, 64QAM, 16QAM, QPSK.
    • Frequency Bands and Bandwidths:
      • ITU WRC.
      • 5G Spectrum Goals, mmwave.
    • Spectrum Sharing:
      • Coordination Options.
    • Massive MIMO:
      • Use Cases and Deployment Considerations.
  • 5G RAN Deployment Options:
    • Options 1, 2, 3, 4, 5, 7.
  • Dual-Connectivity:
    • Multi RAT Dual Connectivity:
      • NR-DC, EN-DC, NGEN-DC, NE-DC.
    • RRC Considerations.
    • MCG Split SRB.
    • User Plane Splitting:
      • MCG Bearer, MCG Split Bearer, SCG Bearer, SCG Split Bearer.
    • Mobility and Dual Connectivity.
  • C-RAN:
    • C-RAN Protocol Stack Split:
      • gNB-CU, gNB-DU, gNB-CU-CP, gNB-CU-UP, E1, eCPRI.
    • Focus on F1:
      • F1AP, User Data Transfer.

Topic areas covered include:

  • Non Standalone Access Architecture:
    • EN-DC Model.
    • MN Terminated SCG Bearer, SN Terminated MCG Bearer.
    • Options 3a and 3x.
    • EN-DC Split Bearer Protocol Stack.
  • Initial Procedures:
    • Initial Attach Considerations.
    • Preparing for EN-DC in the RAN:
      • X2 Management.
  • EN-DC Secondary Node Addition:
    • SgNB Addition Request and Request Acknowledge:
      • User Plane Splitting Configuration.
    • RRC Connection Reconfiguration.
    • Updating the User Plane Path
    • Updating the User Plane Path.
    • Secondary Node Modification.
  • EN-DC Change of Secondary Node.
  • EN-DC Release of Secondary Node.
  • Inter MeNB Handover with EN-DC.

Topic areas covered include:

  • Identities Used in 5G:
    • Subscriber Related Identities:
      • SUPI, SUCI, 5G-GUTI Composition, PEI, IP Addressing.
    • Network Related Identities:
      • NCGI, gNB ID, TAI, GUAMI, FQDN, DNN.
  • Registration and Connection Management:
    • Registration Management:
      • RM Deregistered, RM Registered.
    • Connection Management.
      • CM Connected, CM Idle.
    • RRC States:
      • RRC Idle, RRC Connected, RRC Inactive.
  • Network Access:
    • PLMN and Access Network Selection.
    • Cell Selection / Reselection.
    • RRC Connection Establishment:
      • RACH procedure.
  • 5G Registration.
  • Network Function Selection.
  • Deregistration:
    • UE Initiated Deregistration.
    • Network Initiated Deregistration.

Topic areas covered include:

  • 5G Security Overview.
  • 5G Security Algorithms.
  • Authentication and Key Agreement:
    • AV Generation:
      • KAUSF, XRES*, AUTN, RAND.
  • 5G AKA:
    • Key Derivation at the AMF.
    • Device Authentication.
    • 5G HE AV, 5G SE AV, HXRES*, HRES*, KSEAF.
  • Security Procedures:
    • Key Distribution in 5G:
      • Key Hierarchy.
    • NAS Signalling Security.
    • RRC Signalling Security.
  • Securing AN to CN Communication:
    • IPSec Basic Operation:
      • IPSec ESP.
    • Establishment of gNB Security Associations:
      • X.501 Certificate Exchange.

Topic areas covered include:

  • PDU Sessions:
    • PDU Session Connectivity:
      • Anchor and Intermediate UPFs.
    • PDU Session Types:
      • IP, Ethernet, Unstructured Data.
  • QoS Model for 5G:
    • QoS Flow Parameters:
      • QFI, QoS Rule Composition, PDR.
    • 5G QoS Identifier:
      • Resource Type, Priority, PDB, PER, Averaging Window, Maximum Data Burst Volume.
    • Allocation and Retention Priority.
    • Controlling Bit Rate:
      • UE AMBR, Session AMBR, MFBR, GFBR.
    • Reflective QoS.
  • Establishing a PDU Session:
    • Establishing a QoS Flow (PDU Session Modification).
  • Utilizing PDU Sessions:
    • Service Request.
    • Paging.
    • RRC Inactive State and Paging.
    • Releasing the Access Network Resources.
    • Session and Service Continuity.

Topic areas covered include:

  • CM Idle Mobility Procedures:
    • Discontinuous Reception.
    • Cell Reselection.
    • Registration Area Update.
  • CM Connected Mobility – Handovers:
    • Xn Based Handover Procedure.
    • Xn Handover with UPF Relocation.
  • CM Connected Mobility – N2 Handover.
  • Dual Connectivity – Secondary Node Change.
  • Roaming in 5G:
    • Home Routing, Local Breakout.
      • SEPP.
    • IP Packet Exchange.
    • IPX Connectivity Options.

Topic areas covered include:

  • Interworking with LTE:
    • Single and Dual Registration Mode.
    • Basic Mobility Scenarios (with N26).
    • Basic Mobility Scenarios (without N26).
  • Connected Mode Mobility Procedures (with N26):
    • 5GS to EPS Handover.
    • EPS to 5GS Handover.
  • Interworking with Non-3GPP Networks:
    • Architecture for Non-3GPP Accesses.
    • Non-3GPP Access Registration.
    • Establishing PDU Sessions.
    • Modifying a PDU Session.
    • Utilizing PDU Sessions

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