The Future of Wireless Broadband Access

Dr. Michael MeyerEricsson Research, Aachen, Germany

© Ericsson AB 2007 European Wireless 2007 2007-04-032

Broadband Subscriptions/Lines

0

200

400

600

800

1 000

1 200

1 400

1 600

2005 2006 2007 2008 2009 2010 2011

mill

ions Mobile Broadband

Fixed Broadband

Broadband Subscriptions/Lines

Sources: Ovum, Wireless Intelligence, Strategy Analytics, Gartner and Ericsson calculations/extrapolations

Broadband everywhere!

© Ericsson AB 2007 European Wireless 2007 2007-04-033

3GPP LTE Requirements/Performance Targets

! Focus on PS-domain services! High data rates

– Peak data rates: Beyond 100 Mbps (DL) / Beyond 50 Mbps (UL)

! Low latency – User plane: Less than 10 ms (RAN RTT)

! High spectral efficiency– 3-4 times HSPA Release 6– Improved performance for broadcast services

! Spectrum flexibility– Deployable in a wide-range of different spectrum allocations of

different sizes– Same technology for unpaired and paired spectrum (TDD/FDD)

© Ericsson AB 2007 European Wireless 2007 2007-04-034

LTE Architecture

© Ericsson AB 2007 European Wireless 2007 2007-04-035

LTE Functional Split

© Ericsson AB 2007 European Wireless 2007 2007-04-036

3GPP LTE / SAE High Level Work Plan

2006 2007Q3

37

Q1

35

Q2

36

Q3

33323GPP TSGsPlenary Meetings

Q4

34 38

Q4

TSG RAN

TSG SA

TSG CT

= Study item phase

= Work item phase

LTE Protocol

Architecture sta

ble

LTE and SAE stage 2

specifications approved

= Maintenance

2008

LTE / SAE specific

ations

functional frozen

LTE Performance

Requirements

Performance checkpoint 2

Q2

Performance checkpoint 1

LTE RF parmeters (blocking

and link budget) stable

© Ericsson AB 2007 European Wireless 2007 2007-04-037

HSPA+, LTE, and WiMAXCommon and Distinctive Features

MIMOBeamforming

MIMOBeamforming

MIMOBeamforming

Antenna concepts

TDD3.5-10 MHz

OFDM (DL & UL)

QPSK-64QAMTurbo codesHARQ II

Quality-based scheduling

WiMAX

Quality-based scheduling

Quality-based scheduling

MAC

QPSK-64QAMTurbo codes HARQ II

QPSK-64QAMTurbo codes HARQ II

Physical layer

FDD and TDD1.25-20 MHz

FDD 5 MHz

Duplex andBandwidth

OFDM (DL)FDMA (UL)

CDMA (DL & UL)Multiple access

LTEHSPA+

TXTX

timefrequency

What’s Next?

© Ericsson AB 2007 European Wireless 2007 2007-04-039

New Challenges are ahead

! LTE Phase II will start in Q4 2007! IMT Advanced: Proposals are due in 2008/2009

! Drivers– Increased Spectral Efficiency– Increased Capacity– Higher Peak Data Rates– Further Decreased Delays– Cost-efficient Deployment

! Technologies are needed that support those

© Ericsson AB 2007 European Wireless 2007 2007-04-0310

Where is Research Input needed?

! Advanced Antenna Solutions! Interference Coordination, Cancellation & Avoidance! Relaying Techniques! Peer-to-Peer! Simplified Network Operation! Advanced MBMS Concepts

! Scenarios need to be identified leading to new Deployment Schemes

© Ericsson AB 2007 European Wireless 2007 2007-04-0311

Some Care is required…

! Often studies are performed with too optimistic assumptions

! Examples:– Cost of Control signalling is often underestimated

! uplink scheduler! interference co-ordination! advanced MIMO concepts

– Even if the information is available, it might be out-dated– Crosslayer/function-Design is crucial

! Optimizations by Interference Co-ordination are impacted by Advanced Multi-Antenna Concepts

© Ericsson AB 2007 European Wireless 2007 2007-04-0312