LTE Radio Interface

LTE Radio Interface Training Course

The LTE Radio Interface training course contains detailed information about the evolved radio access interface, E-UTRA used within LTE – Long Term Evolution introduced in 3GPP Release 8 and Release 9 as part of the Evolved Packet System (EPS).

The LTE Radio Interface training course focuses on the OFDM-based radio interface physical layer, used for LTE. The course describes the layer 1 processing chain in detail along with the mapping of physical channels onto OFDM Resource Elements. Downlink and uplink control channels for scheduling, hybrid-ARQ operation and feedback signalling are also described in detail.

The training course moves on to cover the layer 1 procedures for synchronisation, random access, scheduling, sounding and hybrid-ARQ.

Physical layer topics included in LTE Advanced that are included in Release 10 and beyond including Carrier Aggregation and enhanced uplink/downlink MIMO operation are also detailed, although TDD operation is not included in this course.

LTE Radio Interface Training Course contents

E-UTRA Overview

• Evolved Packet System, EPS network architecture

• Summary of radio techniques used in E-UTRA

• Current status of the LTE and LTE-A standards

E-UTRA Protocol Architecture

• Logical, transport and physical channels and their relation to the radio interface protocol stack

• Overview of RRC signalling and layer 2 functions relevant for proper layer 1 operation

Usage of OFDM & MIMO in E-UTRA

• Overview of OFDM transmission: subcarriers, OFDM symbols, cyclic prefixes, DFT processing

• E-UTRA resource definitions: Resource Elements, RE Groups, Control Channel Elements, Resource Blocks

• Multi-antenna transmission basics

• E-UTRA transmission modes: Tx diversity, spatial multiplexing and beam-forming

• Antenna-specific Reference Signals (RS)

Layer 1 Information Processing

• Channel coding and rate matching

• Modulation and scrambling

• Layer mapping, pre-coding and antenna mapping

• Resource Element mapping and OFDM signal generation

• The E-UTRA radio frame, sub-frame and slot structure

Synchronization & Network Access

• P-SS, S-SS and the Physical Cell Id.

• Pseudo-random sequence generation

• PBCH and system information

• RACH and the Random Access procedure

• Coding and mapping of the PRACH

Downlink Transmission

• Downlink control procedures on PCFICH and PDCCH

• Coding and mapping of the PCFICH and PDCCH channels

• Blind decoding of control channels in the UE: search spaces, aggregation levels and PDCCH formats

• Usage of different DCI contents

• Determination of transmission mode, MCS and TB size

• Resource allocation type 0, 1 and 2

Uplink Transmission Procedures

• Time-frequency mapping of the PUCCH region(s)

• Control signalling procedures on PUCCH

• Usage of different PUCCH/UCI formats

• Multiplexing UCI on PUSCH

• Coding and mapping of the PUCCH

• Coding and mapping of the PHICH

• The Sound Reference Symbol, SRS

• Demodulation Reference Symbols, DMRS

Hybrid-ARQ and Scheduling

• HARQ processes, timing, redundancy versions

• Discontinuous reception, DRX

• CQI and PMI/RI reporting options

• Semi-Persistent Scheduling, SPS

• Scheduling request procedure

LTE Advanced (new items included for Rel 10 and beyond)

• Downlink enhanced MIMO operation

• Non-codebook based pre-coding

• Uplink MIMO and multi-cluster allocation

• Carrier aggregation, CA and cross carrier scheduling

• New DCI formats for uplink/downlink assignment

Pre-requisites:

In order to gain the most from the LTE Radio Interface training course, it is advised that attendees have a basic knowledge of the architecture, terminology and modes of operation of the E-UTRAN radio access network is highly recommended. Knowledge about UMTS High Speed Packet Access concepts is useful but not mandatory.

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