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LTE Radio Interface

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Introduction

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LTE Radio Interface?

Different from othertechnologies

New structures

Some similarities

eNB ?

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Scope and objectives

Describe OFDM/OFDMA

Describe SC-FDMA

Explain Flexible Spectrum Usage

Explain Hybrid ARQ (HARQ)

Present Radio Interface Structure

Describe Channel Structure

Objectives

Scope

Downlink and Uplink Transmission

Technique

Flexible Spectrum Usage

HARQ

Radio Interface and Channel Structure

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Pre-Test

Pre-test

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TIES

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Overview

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LTE Radio Interface

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Downlink transmission technique

FlexiblebandwidthoperationDifferentregions

Differentfrequencybands&bandwidths

eNB

OFDM/OFDMA

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OFDM

Datastream

Subcarrier

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frequency

User #2 scheduledUser #1 scheduled

User #3

scheduled

OFDMA

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110 RB (20 MHz)

Bandwidth flexibility

20 MHz151031.4 5

1.4 MHz

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fDL

fUL

FDD

fDL

fUL

Half-duplex FDD

fDL/UL

TDD

Time-domain structure

-moreoverheadandlatency+radiochannelreciprocity

+simplertodeployinlimited

availablespectrum

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Multi Antenna Possibilities

RX

MIMO

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Segmentation, ARQ

Ciphering

Header Compr.

Hybrid ARQHybrid ARQ

MAC multiplexing

Antenna and resrouce

mapping

Coding + RM

Data modulation

Antenna and resource

mapping

Coding

Modulation

User#1 User#2

Concatenation, ARQ

Deciphering

Header Compr.

Hybrid ARQHybrid ARQ

MAC demultiplexing

Antenna and resrouce

mapping

Coding + RM

Data modulation

Antenna and resource

demapping

Decoding

Demodulation

eNodeB UE

EPS bearers

E-UTRA

Radio Bearers

Logical

Channels

Transport

Channels

Physical

Channels

Radio interface structure

MAC MAC

RLC#1

PHY

RLC

PHY

PDCP#1

PDCP

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PHY

MAC

RLC

PDCPRRC

UE

PHY

MAC

RLC

PDCP

eNB

RRC

NAS NAS

Control PlaneMME

S1-CP

RadiointerfaceControlSignaling

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Receiver process Receiver process

Demultiplexed and forwarded to RLC

Receiver processReceiver processprocessHARQ process

3 72 61 5 9

Datastream

0 4 8

The HARQ Principle

processHARQ process

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Control

Channelstructure

PHY

MAC

RLC

Logical

Channels

Transport

Channels

Physical

Channels/

Signals

Traffic

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Summary

OFDM/OFDMA in DL

SC-FDMA in UL

Six different bandwidths

FDD, TDD and Half-duplex FDD

Multiple antenna solutions Layered interface structure

eNB

OFDM/OFDMA

SC-FDMA

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Quiz