Mobile Broadband is changing the industry Just like mobile telephony once did

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Mobile BroadbandWhere are we, where are we going
Dr. Henrik Sahlin Base Band Research Group,
Gothenburg
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Mobile broadband
2003/4
2005/6
2009/10
2007/8
2011/12

• Where are we?
• HSPA today (DL 7.2 Mbps , UL 384 kbps)

200 Mbps
3G LTE
42 Mbps
HSPA Evolution
14 Mbps
7 Mbps
HSPA(HSDPA EUL)

• Where are we going?
• HSPA tomorrow (DL 14 Mbps , UL 5.8 Mbps)
• HSPA evolution (DL 42 Mbps, UL 11.5 Mbps)
• 3G LTE (gt200 Mbps)

WCDMA
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Mobile broadband
2003/4
2005/6
2009/10
2007/8
2011/12
200 Mbps
3G LTE
42 Mbps
HSPA Evolution
14 Mbps
7 Mbps
HSPA(HSDPA EUL)
WCDMA
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HSDPA
High Speed Downlink Packet Access
Short TTI(2 ms)

• Peak rates up to 14 Mbps
• Higher average data rates
• Higher capacity 100-200
• Reduced latency 75 ms

Higher-order modulation(16QAM)
Channel-dependentscheduling
Link adaptation
Basic principle Utilize the radio-channel
characteristics instead of fighting them !
Hybrid ARQ with soft combining
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Enhanced Uplink (EUL)
( also known as HSUPA )

• Peak rates up to 5 Mbps
• Improved coverage
• 384 kbps for more than 80 of users in a network
  planned for 64 kbps
• Higher capacity 50-100
• Reduced latency 50 ms

Basic principle Full access to the channel
when and where needed !
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HSDPA 3.6 Mbps August 2006
Mobile
Median bitrate 2.1 Mbps walking 1.7 Mbps 60 km/h
High speed in Macro Networks
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Mobile broadband network all over the world
IMT-2000/HSPA launched all over the world
50 countries
100 commercial HSPA launches
7.2 Mbps today
Source GSA and Ericsson
HSPA
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Mobile broadband from end-user perspective128
HSPA enabled devices (source GSA by end of
2006)A 3G network today provides mobile
broadband, as well as telephony!
32 PC cards and modules
1 Personal media player
30 laptops
46 handsets
19 Modems
GSAGlobal Mobile Suppliers Association
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Mobile broadband
2003/4
2005/6
2009/10
2007/8
2011/12
200 Mbps
3G LTE
42 Mbps
HSPA Evolution
14 Mbps
7 Mbps
HSPA(HSDPA EUL)
Ensure HSPA long-termcompetitiveness
WCDMA
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HSPA Evolution

• Higher order modulation
• Uplink - 16QAM
• Downlink - 64QAM
• MIMO, 2x2 downlink
• Advanced Receivers
• Reduced Latency
• Continuous Packet Connectivity
• Evolved MBMS

Enhanced system performance and end user
experience
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HSPA Evolution In 5 MHz BW
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Mobile broadband
2003/4
2005/6
2009/10
2007/8
2011/12
200 Mbps
3G LTE
42 Mbps
HSPA Evolution
14 Mbps
7 Mbps
HSPA(HSDPA EUL)
Provide a smooth introductionof 4G radio-access
technology
WCDMA
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3GPP LTE Key radio-access features

• Spectrum flexibility
• Flexible bandwidth 1.25 MHz to 20 MHz
• Duplex flexibility TDD and FDD
• Radio access based on
• Downlink OFDM
• Uplink SC-FDMA (pre-coded OFDMA)
• Channel adaptation
• Time domain
• Frequency domain
• Advanced multi-antenna technologies
• multi-layer transmission
• beam forming

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3GPP LTE Bandwidth and duplex flexibility

• Bandwidth flexibility to enable operation in
  differently-sized spectrum allocations

2.5 MHz
1.25 MHz
10 MHz
15 MHz
20 MHz
5 MHz

• Duplex flexibility to enable operation in paired
  and unpaired spectrum

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3GPP LTE Downlink radio access

• OFDM
• robust broadband transmission,
• frequency-domain channel adaptation
• inter-cell interference co-ordination
• low-complexity multi-layer transmission
• Adaptive to channel conditions and spectrum
  scenarios
• Time and frequency-domain channel adaptation
• Multi-band, flexible bandwidth, duplex
  flexibility,
• Multi-layer transmission for very high data rates
  and high spectrum efficiency

Adaptive Multi-Layer OFDM (AML-OFDM)
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3GPP LTE Uplink radio access
SC-FDMA

• FDMA Intra-cell orthogonality in both time and
  frequency domain
• Orthogonal uplink ? Improved uplink capacity
  when combined with fast centralized scheduling
• Sharing in frequency domain ? Improved
  efficiency for power-limited terminals and
  small payloads
• Non-orthogonal uplink access also supported
• Single-carrier Low PAPR (Peak to Average
  Power Ratio) transmission
• Reduced terminal cost and power consumption
• Improved uplink coverage/capacity
• High degree of commonality with LTE downlink
  radio access
• e.g. same basic transmission parameter
• Can be seen as pre-coded OFDMA, more specifically
  DFT-S-OFDM

Single-Carrier FDMA (SC-FDMA)
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Channel-Dependent Scheduling

• Shared channel transmission
• Select user and data rate based on instantaneous
  channel quality
• Time-domain adaptation used already in HSPA

• Scheduling in time and frequency domain
• Link adaptation in time domain only

Time-frequency fading, user 1
Time-frequency fading, user 2
User 1 scheduled
User 2 scheduled
1 ms
Time
180 kHz
Frequency
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3GPP LTE Advanced antenna solutions

• LTE targets extreme performance in terms of
  peak data rates, coverage, and capacity
• Advanced multi-antenna solutions is the key
  component to achieve these targets
• Different antenna solutions needed for different
  scenarios/targets
• High peak data rates ? Multi-layer transmission
• Good coverage ? Beam-forming
• High capacity ? Beam forming ( and multi-layer
  transmission)
• Multi-antenna terminals will be mandatory for LTE

Multi-layer transmission (MIMO)
Beam-forming
A generic LTE antenna concept adaptable to a
wide range of scenarios (large vs. small cells,
high peak data rates vs. good coverage, )
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3GPP LTE Advanced antenna solutions
Different antenna solutions needed depending on
key target(s)
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Conclusions

• HSPA is Mobile Broadband Now!
• HSPA technology today
• Around 100 networks commercially launched
• More than 100 devices
• 1.8 3.6 Mbps devices reaching mass market
• 7.2 Mbps downlink, 1.4 Mbps uplink commercially
  launched
• HSPA evolution
• 42 Mbps downlink, 12 Mbps uplink
• Demonstrated at CTIA06
• LTE
• Smooth introduction of 4G radio access
• gt200 Mbps
• Demonstrated at GSM07

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Further reading
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