Troubleshooting of the LTE Radio Interface Duration: 4 days

Troubleshooting of the LTE Radio Interface
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.

The course provides in-depth knowledge of protocols and procedures found on Evolved UTRAN (E-UTRAN) through theory combined with case studies and self-solved hands-on exercises. 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.

NOTE: Participants are required to have a Windows laptop.

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