Complex practical troubleshooting and optimization activities are made simple using monitoring tools, such as TEMS Investigation, and log-files recorded in live networks. Throughout the course a number of signalling scenarios are analysed, showing both successful and failed scenarios.


This course is targeted at telecom professionals working on troubleshooting, quality assessment, optimisation, and OAM of E-UTRA.


Participants must hold basic knowledge of LTE/EPC network architecture, terminology and modes of operation. For required background knowledge, attending Apis’ course LTE/EPC System Overview (or equivalent) is recommended. Additionally, familiarity with E-UTRA interface, protocols and signalling scenarios, so as with network monitoring tools, e.g. TEMS Investigation, would be beneficial.

NOTE: Participants are required to have a Windows laptop.

Course content

EPS Overview and E-UTRAN Protocol Architecture

  • Mobile network evolution: GSM to EPS
  • Network nodes, areas, bearer concepts and identity numbers introduced for EPS
  • EPS interfaces and protocols
  • E-UTRA frequency bands and UE capabilities
  • Logical, Transport and Physical channels and their relation to the radio interface protocol stack
  • X2, S1 and S11-interface protocol stacks

Uu-Interface (E-UTRA Radio Interface) Protocols

  • NAS procedures (EMM and ESM)
  • RRC procedures
  • UE states and state transitions (NAS and RRC)
  • PDCP and RLC protocols
  • MAC and E-UTRA Scheduling
  • Dynamic scheduling and semi-persistent scheduling
  • Hybrid-ARQ
  • E-UTRA Physical Layer

The X2 Interface

  • X2 Application Protocol (X2AP) procedures
  • Inter cell interference cooperation
  • Data forwarding and in-order delivery of data PDUs at handover


  • Cell Reselection procedure
  • Tacking Area Update
  • Measurement Control & Reporting
  • LTE Events
  • Handover between eNodeBs


  • Interworking with legacy R8 or pre-R8 3GPP networks
  • CS Fallback

E-UTRAN Signalling Procedures and Hands-on Exercises

  • Random access procedure
  • RRC connection establishment
  • Attach procedure, incl. establishment of default EPS bearer and security associations
  • Dedicated Bearer activation
  • Mobility and Interworking
  • Troubleshooting Case Studies

Duration: 4 days


Classroom training: € 2780

Virtual classroom training: € 1950

We offer substantial discounts for group bookings, and we have corporate rates with most of the operators and equipment suppliers in the world.

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