The course contains in-depth description of gNB external interfaces, protocols and procedures. The training also contains an overview of the 5G System (5GS) architecture and functionality which is necessary to show New Radio (NR) operation within the context of the entire system and to fully cover all aspects of NR/E-UTRAN – 5G Core (5GC) interworking.

Target audience:

Experienced network engineers, network planning, management and tuning staff, protocol stack developers and testers, as well as anyone with network experience who needs deep technical knowledge of NR.


4 days.


  • Introduction

    5GS service based and reference point architecture, UDM, UDR, UDSF, 5G-EIR, AMF, SMF, UPF, multiple Packet Session Anchors, Session and Service Continuity, SMS over NAS, PCF, AF, IMS/VoLTE support, interworking with LTE/EPC, NEF, NWDAF, AUSF, N3IWF, NRF, LADN, international roaming, GTPv1-U tunnelling, protocol stacks; identifiers: SUPI/IMSI, SUCI, PEI/IMEI, 5G-GUTI, GPSI/MSISDN/external identifier, Internal-Group Identifier, External Group Identifier, DNN, DNAI,

  • PDU sessions & QoS

    PDU Session types, QoS Flows, QoS Rules & PDRs, QoS profile: 5QI, non-GBR, GBR and delay critical GBR characteristics; ARP, RQA, notification control, UE-AMBR, Session-AMBR, UPF traffic processing, Forwarding Action Rules, QoS Enforcement Rules, Usage Reporting Rules, Support for Edge Computing,

  • Network Slicing

    Network slicing concept, UE’s multiple network slices, S-NSSAI and NSSAI, network slice instances, subscription parameters, UE Configuration, AMF selection, PDU session establishment and SMF selection, Network Function Virtualisation (NFV), TNL associations, RAN virtualisation,

  • Traffic Cases

    RM states: RM-REGISTERED and RM-DEREGISTERED states, TA/TA list management, CM states: CM-CONNECTED with RRC-CONNECTED state, CM-CONNECTED with RRC-INACTIVE state, CM-IDLE, selective (de)activation of U-plane connections, UE reachability in CM-CONNECTED, RAN-based Notification Area (RNA) and paging, MICO mode, procedures: Registration, UE Triggered Service Request, Network Triggered Service Request, AN Release, PDU Session Establishment, SMS, Xn-based Handover, N2 based Handover, N26-based 5GS to EPS handover

  • Security

    UDR/AUSF and USIM functionality, authentication and key agreement, key hierarchy, ciphering and integrity protection, KSN and local authentication, re-keying and key change, inter-RAT mobility,

  • Non-Access Stratum

    Interworking with E-UTRAN connected to EPC: single and dual registration modes, CN selection; NAS signalling connection establishment, routing of initial NAS messages, signalling connection release, registration, deregistration, security procedures, service request, paging, notification, SMS, PDU Session establishment/modification/release,

  • Radio Resource Control (RRC)

    protocol states, signalling and data radio bearers, system information, paging, connection establishment, reconfiguration, connection release, RLF, re-establishment, activation and deactivation, intra-NR mobility, , inter-RAT mobility, measurements and event reporting, connection release, idle mode mobility,

  • Service Data Adaptation Protocol (SDAP)

    SDAP architecture, SDAP-PDCP interworking, QoS flow to DRB mapping, reflective QoS flow to DRB mapping, SDAP PDUs

  • Packet Data Convergence Protocol (PDCP)

    sequence control and duplicate detection, integrity protection, ciphering, data retransmission during handover and reestablishment, CA and DC operation

  • Radio Link Control (RLC)

    RLC transmission modes: TM, UM and AM, error correction, segmentation and reassembly of SDUs, re-segmentation and reordering of PDUs,

  • Medium Access Control (MAC)

    random access procedure, time alignment, DL/UL-SCH data transfer, HARQ operation, bundling operation, multiplexing and assembly of logical channels, QoS, SR, BSR and PHR reporting, DRX, SPS, RNTIs, CA operation

  • Physical Layer

    OFDM and DFT spread OFDM, frequency range, flexible numerology, resource allocation, physical channels and signals, reference signals & channel estimation, MIMO, channel coding, link adaptation, CSI reporting, measurements, UL power control,

  • NG Application Part (NGAP)

    E-RAB setup/modification/release, NAS transport, initial context setup, context modification/release; intra-NG-RAN, inter-RAT and SRVCC handover, path switch, RAN status transfer, paging, management procedures, UE capability info indication, trace procedures, location reporting,

  • Xn Application Part (XnAP)

    handover, path switch, data forwarding, DC operation


General knowledge of 5G System (5GS) architecture and functionality is required. Knowledge about LTE services is very useful.

Completion of 5G System Overview course (or equivalent) is highly recommended.

Training method:

Lectures and multimedia presentations.

LTE™ is a Trade Mark of ETSI.

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