1 LTE Radio Interface Impl3

LTE Radio Interface

Introduction

LTE Radio Interface?› Different from other technologies

› New structures

› Some similarities

eNBeNB ?

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

Pre-Test

Pre-test

PROPERTIESOn passing, 'Finish' button: Goes to Next SlideOn failing, 'Finish' button: Goes to SlideAllow user to leave quiz: After user has completed quizUser may view slides after quiz: At any timeUser may attempt quiz: Unlimited times

Click on this button to skip the course and go to EriColl to register your

attempt.

Click this button to go to the first topic in the course.

Continue recommended path

Browse through the course

Browse or Proceed

Make your choice!

Overview

LTE Radio Interface› Interface between UE and

eNodeB

› Hybrid ARQ

› Multi Antenna Possibility

› Flexible spectrum usage

processHARQ process

3210 4 …

eNBeNB

LTE Radio Interface

Downlink transmission technique

Flexible bandwidth operation Different regions Different frequency bands & bandwidths

eNBeNB

OFDM/OFDMA

OFDM

Datastream

Subcarrier

frequency

time1 ms

User #2 scheduledUser #1 scheduled

User #3 scheduled

OFDMA

SC-FDMA

time

frequency

Uplink transmission technique

Intra-cellorthogonality

eNBeNB

SC-FDMA

110 RB (20 MHz)

Bandwidth flexibility

20 MHz151031.4 5

1.4 MHz

fDL

fUL

FDDfDL

fUL

Half-duplex FDDfDL/UL

TDD

Time-domain structure

- more overhead and latency+ radio channel reciprocity+ simpler to deploy in limited

available spectrum

PROPERTIESOn passing, 'Finish' button: Goes to Next SlideOn failing, 'Finish' button: Goes to Next SlideAllow user to leave quiz: At any timeUser may view slides after quiz: At any timeUser may attempt quiz: Unlimited times

Multi Antenna Possibilities

RXRX

MIMO

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

PHYMACRLC

PDCPRRC

UE

PHYMACRLC

PDCP

eNB

RRCNAS NAS

Control PlaneMME

S1-CP

Radio interface – Control Signaling

Receiver process Receiver process

Demultiplexed and forwarded to RLC

Receiver process

Receiver process

processHARQ process

3 7 2 6 1 5 9

Datastream

0 4 8

The HARQ Principle

processHARQ process

PROPERTIESOn passing, 'Finish' button: Goes to Next SlideOn failing, 'Finish' button: Goes to Next SlideAllow user to leave quiz: At any timeUser may view slides after quiz: At any timeUser may attempt quiz: Unlimited times

Control

Channel structure

PHY

MAC

RLC

Logical Channels

Transport Channels

Physical Channels/ Signals

Traffic

Summary

Summary

› OFDM/OFDMA in DL› SC-FDMA in UL› Six different bandwidths› FDD, TDD and Half-duplex FDD› Multiple antenna solutions› Layered interface structure

eNBeNB

OFDM/OFDMA

SC-FDMA

Quiz

PROPERTIES

On passing, 'Finish' button: Goes to Next Slide

On failing, 'Finish' button: Goes to Slide

Allow user to leave quiz: After user has completed quiz

User may view slides after quiz: At any time

User may attempt quiz: Unlimited times

Evaluation

When clicking ”next” you will be directed to an EriColl page.

It is important that you fill in the form and click OK. This will register your successful attempt. Finish by clicking on the “next” button.

Feedback

You are redirected to an EriColl page.Please wait!