Lte technical overview

LTE Technical Overview

LTE: TECHNOLOGY, BUSINESS AND COMPETITIVE LANDSCAPETHE PARK LANE HOTEL – JAKARTA, SEPTEMBER 29-30, 2010

DR. IR. JOKO SURYANA

LTE Basic Technology

LTE Fundamental : Key Parameters

3LTE Technical Overview 3

LTE Fundamental : Technologies

• OFDM is a Multi Carrier Modulation

• Symbols at rate R are serial to parallel converted to N parallel streams

• Each stream is at rate R/N

• Symbol duration per stream increased N times

• Bandwidth per stream reduced N times

• Each stream modulates one of N orthogonal carriers

• Implemented easily with IFFT / FFT

LTE Fundamental : OFDM

LTE Technical Overview 5

Advantages :

• Resistant to Multipath fading

• Requires simple frequency domain equalization

• Resistant to narrow band interference

• Easy to implement with IFFT / FFT

• Flexibility for adaptive loading (seen later)

• Suitable for Space-Time and Space-Frequency antenna processing

• Symbols X0 to XN-1 modulate N orthogonal Carriers

• Performed with IFFT

1knN j

x X eN

X0 XN-1

LTE Fundamental : OFDM Modulation

• After IFFT, a guard band (cyclic prefix) is added at the beginning

• Guard band duration must be > channel maximum delay

• Guard band prevents Inter-Symbol Interference (ISI) due to multipath

Add guard

After IFFT

OFDM Symbol

LTE Fundamental : Cyclic Prefix

LTE Fundamental : Multipath

LTE Fundamental : ISI in OFDM

General OFDM Modulation and Demodulation

Symbol

Mapping S/P

P/S Add

PSK or QAM

RFRemove

Guard S/P

Frequency

Domain

Equalizer

Symbol

Mapping

PSK or QAM

frequency

LTE Fundamental : OFDM Modem

LTE Fundamental : OFDMA

LTE Fundamental : SC-FDMA

LTE Fundamental : MIMO

LTE Fundamental : Spatial Multiplexing

LTE Fundamental : Precoding

LTE Fundamental : SU-MIMO & MU-MIMO

LTE Fundamental : AAS

LTE Fundamental : MIMO Beamforming

LTE Fundamental : BW Scalability

LTE Fundamental : Core bands

LTE Fundamental : Building Penetration vs Band

LTE Fundamental : Frame Structure

LTE Fundamental : NW Architecture

LTE Fundamental : LTE/SAE Key Features

LTE Fundamental : Network Element

LTE Fundamental : Interworking

LTE and LTE-Advanced Standards

Contents

• 3GPP TSG-RAN standardisation activities

• LTE Release 8&9 overviews

• LTE Release 10 (LTE-Advanced)

– Motivation

– Key requirements

– Key features

– Performance evaluations

3GPP TSG-RANStandardisation Activities

1999 2000 2001 2002 2003 2004 2005

Release 99

Release 4

Release 5

Release 6

1.28Mcps TDD

W-CDMA

HSUPA, MBMS

2006 2007 2008 2009

Release 7 HSPA+ (MIMO, HOM etc.)

Release 8

2010 2011

Release 9

Release 10

Minor LTE enhancements

2012 2013

Release 11

ITU-R M.1457IMT-2000 Recommendation

LTE-AdvancedITU-R M.[IMT.RSPEC]IMT-Advanced Recommendation

Releases of 3GPP Specifications

Approved at ITU-R WP5D meeting in Oct. 2010 as a IMT-

Advanced technology

Technology Evolution path in 3GPP Standards

Release 99 Release 4 Release 5 Release 6 Release 7 Release 8 Release 9 Release 10

HSDPA HSUPAWCDMA HSPA+

25 series

36 series LTE-A

LTE and HSPA Evolutions

3GPP Release #

Release 5 Release 6 Release 7 Release 8 Release 9 Release 10 Release 11

14 Mbps

21-28 Mbps42 Mbps

84 Mbps

168 Mbps

336 Mbps?

64QAM or 2x2 MIMO

64QAM,2x2 MIMOorDual cell(10 MHz BW)

2x2 MIMO,Dual cell(10 MHz BW)

2x2 MIMO,4 carrier(20 MHz BW)

2x2 MIMO,8 carrier(40 MHz BW)

300 Mbps

64QAM, 4x4 MIMO, 20MHz BW

3 Gbps

64QAM, 8x8 MIMO, 100MHz BW

HSPA evolution

LTE evolution

LTE Current Status

LTE Release 8 & 9

LTE Release 8 Key Features

• High spectral efficiency– OFDM in Downlink

• Robust against multipath interference

• High affinity to advanced techniques

– Frequency domain channel-dependent scheduling

– MIMO

– DFTS-OFDM(“Single-Carrier FDMA”) in Uplink• Low PAPR• User orthogonality in

frequency domain

– Multi-antenna application

• Very low latency– Short setup time & Short

transfer delay– Short HO latency and

interruption time• Short TTI• RRC procedure• Simple RRC states

• Support of variable bandwidth– 1.4, 3, 5, 10, 15 and 20 MHz

Rel-9 LTE features• Small enhancements from LTE Release 8 mainly for higher layer

– HeNB (Home eNode B)• HeNB Access Mode

– Rel-8: Closed Access Mode– Rel-9: Open and Hybrid Mode

• HeNB Mobility between HeNB and macro– Rel-8: Out-bound HO– Rel-9: in-bound and inter-CSG HO

– SON (self-organizing networks)• Rel-8: Self configuration, Basic self-optimization• Rel-9: RACH optimization, etc

– MBMS• Rel-8: Radio physical layer specs• Rel-9: Radio higher layer and NW interface specs

– LCS (Location Services)• Rel-8: U-Plane solutions• Rel-9: C-Plane solutions, e.g. OTDOA

Summary 3GPP LTERelease 8 / Release 9

A new radio interface specified in Release 8 and enhanced in Release 9

Provides:

• Broadband data throughput:

• Downlink target 3-4 times greater than HSDPA Release 6

• Uplink target 2-3 times greater than HSUPA Release 6

Significantly reduced latency

High mobility

The basis for 17 commercial launches (as at 12 Jan)

64 commercial launches expected by end of 2012

125 operators publicly committed to launch

LTE set to be the mobile broadband technology

LTE Release 10(LTE-Advanced)

LTE Advanced : Background

Motivation of LTE-Advanced

• IMT-Advanced standardisation process in ITU-R

• Additional IMT spectrum band identified in WRC07

• Further evolution of LTE Release 8 and 9 to meet:

– Requirements for IMT-Advanced of ITU-R

– Future operator and end-user requirements

Key Requirements for LTE-Advanced• LTE-Advanced shall be deployed as an

evolution of LTE Release 8 and on new bands. • LTE-Advanced shall be backwards compatible

with LTE Release 8 Smooth and flexible system migration from

Rel-8 LTE to LTE-Advanced

LTE Rel-8 cell

LTE Rel-8 terminal LTE-Advanced terminal

LTE-Advanced cell

LTE Rel-8 terminal LTE-Advanced terminal

LTE-Advanced backward compatibility with LTE Rel-8

An LTE-Advanced terminal can work in an LTE Rel-8 cell

An LTE Rel-8 terminal can work in an LTE-Advanced cell

LTE-Advanced(LTE Release 10)

LTE Release 8

LTE-Advanced contains all features of LTE Rel-8&9 and additional features for further evolution

LTE Release 9

LTE-Advanced evolved

from LTE Rel-8

Target performance of LTE-Advanced

Cell edge user

throughput

[bps/Hz/cell/user]

DL 2-by-2 0.05 0.07 –

4-by-2 0.06 0.09 0.06

4-by-4 0.08 0.12 –

UL 1-by-2 0.024 0.04 –

2-by-4 – 0.07 0.03

Antenna configuration

Rel. 8 LTE*1 LTE-Advanced*2 IMT-Advanced*3

Average

spectrum

efficiency

[bps/Hz/cell]

DL 2-by-2 1.69 2.4 –

4-by-2 1.87 2.6 2.2

4-by-4 2.67 3.7 –

UL 1-by-2 0.74 1.2 –

2-by-4 – 2.0 1.4x 1.4-1.7

*1 See TR25.912(Case 1 scenario) *2 See TR36.913(Case 1 scenario)*3 See ITU-R M.2135(Base Coverage Urban scenario)

Rel. 8 LTE LTE-Advanced IMT-Advanced

Peak data rate

DL 300 Mbps 1 Gbps1 Gbps(*)

UL 75 Mbps 500 Mbps

Peak spectrum efficiency

[bps/Hz]

DL 15 30 15

UL 3.75 15 6.75

Key Features in LTE Release 10

Key Features in LTE Release 10 Support of Wider Bandwidth(Carrier Aggregation)

• Use of multiple component carriers(CC) to extend bandwidth up to 100 MHz• Common physical layer parameters between component carrier and LTE Rel-8 carrier Improvement of peak data rate, backward compatibility with LTE Rel-8

Advanced MIMO techniques• Extension to up to 8-layer transmission in downlink• Introduction of single-user MIMO up to 4-layer transmission in uplink• Enhancements of multi-user MIMO Improvement of peak data rate and capacity

Heterogeneous network and eICIC(enhanced Inter-Cell Interference Coordination)

• Interference coordination for overlaid deployment of cells with different Tx power Improvement of cell-edge throughput and coverage

Relay• Type 1 relay supports radio backhaul and creates a separate cell and appear as Rel. 8 LTE eNB to

Rel. 8 LTE UEs Improvement of coverage and flexibility of service area extension

Coordinated Multi-Point transmission and reception (CoMP)• Support of multi-cell transmission and reception Improvement of cell-edge throughput and coverage

100 MHz

Carrier and Spectrum Aggregation

BW Extention

Enhanced Multiantenna Techniques

Uplink MIMO

Downlink MIMO

Coordinated Multipoint (CoMP) Transmission and Reception

CoMP Techniques

System level CoMP Joint Processing : A simple example

Relaying

LTE-Advanced Performance Highlights

3GPP LTE-Advanced Self-Evaluation• The self-evaluation results shows:

– For LTE Release 10, FDD RIT and TDD RIT Component meets the minimum requirements of all 4 required test environments, individually.

– Baseline configuration exceeding ITU-R requirements with minimum extension• LTE release 8 fulfills the requirements in most cases (no extensions needed)• Extensions to Multi-user MIMO from Release 8 fulfills the requirements in some

scenarios (Urban Macro/Micro DL)

Spectrum Efficiency: FDD DL, Indoor (InH)

01234567

z/cell)

ITU-R requirement

Rel-8 SU-MIMO 4x2L=1,2,3

Rel-10 MU-MIMO 4x2L=1,2,3

LTE-Advanced Experiments in NTT DOCOMO

DOCOMO developed LTE-Advanced experimental system aligned with 3GPP LTE Release 10 specifications

◆ Laboratory experiments Total throughput of 1 Gbps for 2 Mobile stations in downlink was achieved by applying 4x2 multi-user MIMO technique

◆ Field experimentsThroughput of 600 Mbps in downlink and 200 Mbps in uplink was achieved by applying 2x2 single-user MIMO technique

Base station

Mobile station

◆ Field @ Yokosuka, Japan◆ Laboratory

LTE-Advanced key technologies, e.g., carrier aggregation and enhanced MIMO

Mobile station• Tx Power: 1 W/ant.• Antenna: 2 Tx/Rx• UL Bandwidth: 40 MHz

Base station• Tx power: 10 W/ant.• Antenna: 4 Tx/Rx • DL Bandwidth:

100 MHz

100 m 200 m 300 m 400 m

LTE Technical Overview

May 18, 2011 LTE World Summit 2011

600Mbps

200Mbps

5 CCs2x2 SU-MIMO

2 CCs2x2 SU-MIMO

10 km/h

NTT DOCOMO Field Trial

Not a new technology as such, but a point of maturity along the LTE evolution

path. LTE Advanced provides:

Support for wider Bandwidth (Up to 100MHz)

Downlink transmission scheme

• Improvements to LTE by using 8x8 MIMO

• Data rates of 100Mb/s with high mobility and 1Gb/s with low mobility

Uplink transmission scheme

• Improvements to LTE

• Data rates up to 500Mb/s

Relay functionality

• Improving cell edge coverage

• More efficient coverage in rural areas

CoMP (coordinated multiple point transmission and reception)• Downlink coordinated multi-point transmission

• Uplink coordinated multi-point reception

Local IP Access (LIPA) & Enhanced HNB to allow traffic off-load

Summary LTE-AdvancedRelease 10

103LTE Technical Overview

Conclusions

• LTE Release 8– Specification completed and stable– Commercially deployed and committed to deploy by many

operators all over the world

• LTE Release 9– Small enhancements of LTE Release 8– Specification completed and stable

• LTE Release 10– Stage 3 frozen and stabilized– Accepted as a technology of IMT-Advanced by ITU-R WP5D– Materials and specifications submitted to ITU-R WP5D for

ITU-R recommendation M.[IMT.RSPEC]

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