All Rights Reserved, Copyright©2008, FUJITSU LIMITED. and FUJITSU LABORATORIES LIMITED. REV-080055...

All Rights Reserved, Copyright©2008, FUJITSU LIMITED. and FUJITSU LABORATORIES LIMITED. REV-080055

Technology Considerations

for LTE-Advanced

3GPP TSG RAN IMT-Advanced WorkshopShenzhen, China, 7 - 8 April 2008

FUJITSU LIMITED.FUJITSU LABORATORIES LIMITED.

REV-080055


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ContentsContents

Considerations for the requirements for LTE-Advanced Technologies for LTE-Advanced

Full support of E-UTRA Rel.8 UEs Coverage enhancement Efficient spectrum usage Reduced UE complexity/power consumption


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Considerations for the requirements for

LTE-Advanced


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Voice bandModem

FTTH

VDSL

CATVxDSL

ISDN　　

1990 1995 2000 2005 2010

1G

100K

1K

1M

100M

10M

10KPea

k D

ata

Rat

e [b

it/s]

Wired communication

Transition of Peak Data RateTransition of Peak Data Rate

2015 2020

IMT-Advanced

Source: Ministry of International Affairs and Communications, Japan

IMT-2000(3G)

●HSDPA (7.2M)

●Cdma2000EV-DO　（ 2.4M)　

●W-CDMA (384k)

●3G-LTE

Wireless communication


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Capability of IMT-Advanced Capability of IMT-Advanced

Mobility

High

Low

1 10 100 1000Peak useful data rate (Mbit/s)

IMT-2000

Enhancement

EnhancedIMT-2000

New mobile access

New capabilities of systems beyond IMT-2000

Dashed line indicates that the exact data rates associated with systems beyond IMT-2000 are not yet determined

Systems beyond IMT-2000 will encompass the capabilities of previous systems

New nomadic/local area wireless access

Denotes interconnection between systems via networks, which allows flexible use in any environment without making users aware of constituent systems

Nomadic/local area access systems

Digital broadcast systems

Source：　 RECOMMENDATION ITU-R M.1645，“ Framework and overall objectives of the future development of IMT-2000 and systems beyond IMT-2000”， June 2003


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From 3G to Beyond 3GFrom 3G to Beyond 3G

W-CDMAHSDPA/

HSUPALTE LTE-Advanced

Access methodDL: CDMA

UL: CDMA

DL: CDMA

UL: CDMA

DL: OFDMA

UL: SC-FDMA

DL:OFDM(?)

UL: SC-FDMA(?)

Bandwidth(max.)

5 MHz 5 MHz 20 MHz >100 MHz

Modulation HPSK,QPSK

HPSK

QPSK

16QAM

QPSK

16QAM

64QAM

QPSK

16QAM

64QAM,etc.

Data Rate(max.)

DL: 384kbps

UL: 64kbps

DL: 14.4Mbps

UL: 5.7Mbps

DL: 300Mbps

UL: 75Mbps

DL: ~1Gbps

UL: >50Mbps

Frequency800MHz， 850MHz， 900MHz，1.5GHz, 1.7GHz, 1.8GHz, 1.9GHz,

2.1GHz, 2.6GHz

Same frequency bands as 3G

Additional Frequency bands Identified for IMT

(WRC2007)

Availability FY2000 FY2006-2008 FY2009 Around FY2015


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Technologies for LTE-Advanced


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Full support of E-UTRA Rel.8 UEsFull support of E-UTRA Rel.8 UEs

Smooth migration from Rel. 8 LTE to LTE-advanced Efficient mixed deployment of both systems

Allocating multiple of 20MHz segment for an LTE-Advanced system bandwidth will be a promising approach


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Full support of E-UTRA Rel.8 UEs (Cont’)Full support of E-UTRA Rel.8 UEs (Cont’)

E-UTRA to IMT-Advanced Migration scenarios

Case 1: All the segments of 20MHz support Rel. 8 LTE UEs Case 2: Only one segment of 20MHz in the system bandwidth

supports Rel. 8 LTE UEs Case 3: Combination of above two cases (Interim stage)

LTE support LTE support LTE support

Case 1 Case 3 Case 2

f f f


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Coverage enhancementCoverage enhancement

High peak data rate with reasonable coverage Higher transmission power in UE Higher carrier frequencies (eg. 3.5GHz)

Possible resolutions to achieve reasonable cell coverage: Distributed remote antennas Advanced beam-forming Pico/femto cells (Home eNBs) Relay stations: A possible promising feature


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Coverage enhancement (Cont’)Coverage enhancement (Cont’)

Conventional FFR:

Sacrifices sector throughputs but obtains a high user coverage gain

Advanced adaptive FFR: Parameter control based on

interference level in neighbouring cells Achieve both sector throughput and

user coverage gains

Adaptive Fractional Frequency Reuse (aFFR)

User Coverage

0.2

0.25

0.3

0.35

Base Line Advanced AFFR

User

Cove

rage (

bps/

Hz)

Freq. Band

CQI

CQI

CQI


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Efficient spectrum usageEfficient spectrum usage

To get wider spectrum bandwidth up to 100MHz Aggregation of fragmented spectrums Sharing of fragmented spectrums among several systems Asymmetric UL and DL spectrum allocation

To attain another ‘bit/Hz’ SU-MIMO for UL (2x2 or 2x4) Further enhancement of the current MIMO scheme


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Reduced UE Complexity, Power consumptionReduced UE Complexity, Power consumption

Balance between the system performance And

UE complexity, power consumption

Peak power consumption of an UE will be higher

Enhanced dynamic control of reception bandwidth A multi-carrier UL transmission mode by UE near the eNB

Enabling discontinuous resource allocation Easy utilization of MLD at eNB receivers


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ConclusionConclusion

Based on the requirements for LTE-Advanced, some technical considerations are being considered. Full support of E-UTRA Rel.8 UEs Coverage enhancement Efficient spectrum usage Reduced UE complexity/power consumption

Further developments to be made in order to:

Realize the attractive system for the market

in Time


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All Rights Reserved, Copyright©2008, FUJITSU LIMITED. and FUJITSU LABORATORIES LIMITED. REV-080055...

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