LTE Air Interface

The LTE Air Interface course offers a complete understanding of the radio interface in Long Term Evolution (LTE) technology. A general characteristic of LTE is presented with stress on its advantages and disadvantages. The course focuses on the physical channels structure and their processing in both FDD and TDD mode of LTE. The course also presents procedures of power control, link adaptation and HARQ related to downlink and uplink scheduling. The concept of MIMO in LTE, idle mode behaviour and handover process are also discussed. The course is based on the 3GPP Technical Specifications and hence is equipment vendor independent.

Category: LTE
Duration: 3 days

Target audience

The course is addressed to managerial staff and network engineers involved in the radio network planning and optimization process, as well as to anybody who requires detailed knowledge on the LTE radio interface structure and function.


Ability to understand technical subjects is required. A good understanding of existing 2G and 3G mobile systems will be beneficial.

Course content

● OFDMA principles

  • Two way communication.
  • Access network evolution overview.
  • Complex numbers.
  • Fourier analysis.
  • Orthogonal Frequency Division Multiplexing (OFDM) concept.
  • OFDM transmitter.
  • Modulation.

● EPS architecture

  • LTE requirements.
  • EPS architectural principles.
  • EPC functions.
  • LTE functions.
  • Strata (NAS and AS).
  • EPS Bearer and QoS.
  • Integration with 2G and 3G.
  • Interfaces overview.

● LTE signalling

  • User plane.
  • Control plane.
  • Protocols (RRC, PDCP, RLC, MAC).
  • Radio interface structure.

● LTE radio interface introduction

  • Channel structure (logical channels, transport channels and physical channels).
  • Time domain structure for FDD and TDD.
  • Frequency domain structure.
  • Scheduling Block.
  • Virtual Resource Block (localized and distributed type).
  • System spectral efficiency.

● LTE downlink physical channels

  • Cell search.
  • P-SS.
  • S-SS.
  • RS.
  • PBCH (MIB and SIB).
  • PDCCH (usage, mapping, format, processing, blind decoding).
  • PDSCH (CRC attachment, code block segmentation, channel coding, rate matching, code block concatenation, scrambling, modulation mapper, layer mapper, precoding, resource element mapping).
  • PHICH.
  • PMCH.
  • Downlink physical channels modulation summary

● LTE uplink physical channels

  • PUSCH.
  • Uplink reference signals (RS, SRS).
  • PUCCH.
  • PRACH.

● Physical layer procedures

  • Timing advance (uplink-downlink frame timing, timing advance range, random access, other cases, maintenance of uplink time alignment).
  • Random Access (RA).
  • Resource allocation (type 0, 1 and 2).
  • MIMO (spatial multiplexing, transmit diversity, transmission modes, MIMO antennas).
  • UE reporting (CQI definition, aperiodic CQI/PMI/RI reporting using PUSCH, periodic CQI/PMI/RI reporting using PUCCH).
  • Modulation order and transport block size determination.
  • UL power control (PUSCH power control, PUSCH power control example).

● LTE mobility

  • Idle mode mobility (PLMN selection, cell selection, cell reselection).
  • Connected mode mobility (X2 handover, event triggered reporting, A3 event).

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