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