lte technical overview
TRANSCRIPT
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LTE Technical Overview
LTE: TECHNOLOGY, BUSINESS AND COMPETITIVE LANDSCAPETHE PARK LANE HOTEL – JAKARTA, SEPTEMBER 29-30, 2010
DR. IR. JOKO SURYANA
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LTE Basic Technology
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LTE Fundamental : Key Parameters
3LTE Technical Overview 3
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LTE Fundamental : Technologies
4LTE Technical Overview 4
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• 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
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LTE Fundamental : OFDM
LTE Technical Overview 6
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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
LTE Fundamental : OFDM
LTE Technical Overview 7
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• Symbols X0 to XN-1 modulate N orthogonal Carriers
• Performed with IFFT
21
0
1knN j
Nn k
k
x X eN
x
+
0je
Ser
ial t
o P
aral
lel
x
x
1je
1Nje
IFFT
Add
Guard
guard
X0
XN-1
X0 XN-1
xnTs
NTs
LTE Fundamental : OFDM Modulation
LTE Technical Overview 8
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• 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
Tg To
LTE Fundamental : Cyclic Prefix
LTE Technical Overview 9
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LTE Fundamental : Cyclic Prefix
LTE Technical Overview 10
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LTE Fundamental : Cyclic Prefix
LTE Technical Overview 11
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LTE Fundamental : Multipath
LTE Technical Overview 12
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LTE Fundamental : ISI in OFDM
LTE Technical Overview 13
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General OFDM Modulation and Demodulation
Symbol
Mapping S/P
IFF
T
P/S Add
Guard
bits
PSK or QAM
RF
RFRemove
Guard S/P
FF
T
P/S
Frequency
Domain
Equalizer
Symbol
De-
Mapping
bits
PSK or QAM
frequency
LTE Fundamental : OFDM Modem
LTE Technical Overview 14
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LTE Fundamental : OFDMA
LTE Technical Overview 15
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LTE Fundamental : OFDMA
LTE Technical Overview 16
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LTE Fundamental : OFDMA
LTE Technical Overview 17
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LTE Fundamental : OFDMA
LTE Technical Overview 18
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LTE Fundamental : OFDMA
LTE Technical Overview 19
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LTE Fundamental : OFDMA
LTE Technical Overview 20
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LTE Fundamental : SC-FDMA
LTE Technical Overview 21
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LTE Fundamental : SC-FDMA
LTE Technical Overview 22
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LTE Fundamental : SC-FDMA
LTE Technical Overview 23
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LTE Fundamental : SC-FDMA
LTE Technical Overview 24
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LTE Fundamental : SC-FDMA
LTE Technical Overview 25
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LTE Fundamental : SC-FDMA
LTE Technical Overview 26
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LTE Fundamental : MIMO
LTE Technical Overview 27
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LTE Fundamental : MIMO
LTE Technical Overview 28
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LTE Fundamental : MIMO
LTE Technical Overview 29
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LTE Fundamental : Spatial Multiplexing
LTE Technical Overview 30
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LTE Fundamental : Precoding
LTE Technical Overview 31
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LTE Fundamental : SU-MIMO & MU-MIMO
LTE Technical Overview 32
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LTE Fundamental : AAS
LTE Technical Overview 33
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LTE Fundamental : AAS
LTE Technical Overview 34
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LTE Fundamental : MIMO Beamforming
LTE Technical Overview 35
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LTE Fundamental : BW Scalability
LTE Technical Overview 36
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LTE Fundamental : BW Scalability
LTE Technical Overview 37
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LTE Fundamental : Core bands
LTE Technical Overview 38
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LTE Fundamental : Building Penetration vs Band
LTE Technical Overview 39
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LTE Fundamental : Frame Structure
LTE Technical Overview 40
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LTE Fundamental : Frame Structure
LTE Technical Overview 41
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LTE Fundamental : Frame Structure
LTE Technical Overview 42
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LTE Fundamental : Frame Structure
LTE Technical Overview 43
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LTE Fundamental : Frame Structure
LTE Technical Overview 44
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LTE Fundamental : Frame Structure
LTE Technical Overview 45
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LTE Fundamental : Frame Structure
LTE Technical Overview 46
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LTE Fundamental : NW Architecture
LTE Technical Overview 47
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LTE Fundamental : NW Architecture
LTE Technical Overview 48
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LTE Fundamental : NW Architecture
LTE Technical Overview 49
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LTE Fundamental : NW Architecture
LTE Technical Overview 50
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LTE Fundamental : NW Architecture
LTE Technical Overview 51
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LTE Fundamental : NW Architecture
LTE Technical Overview 52
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LTE Fundamental : NW Architecture
LTE Technical Overview 53
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LTE Fundamental : LTE/SAE Key Features
LTE Technical Overview 54
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LTE Fundamental : LTE/SAE Key Features
LTE Technical Overview 55
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LTE Fundamental : LTE/SAE Key Features
LTE Technical Overview 56
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LTE Fundamental : LTE/SAE Key Features
LTE Technical Overview 57
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LTE Fundamental : Network Element
LTE Technical Overview 58
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LTE Fundamental : Network Element
LTE Technical Overview 59
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LTE Fundamental : Network Element
LTE Technical Overview 60
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LTE Fundamental : Network Element
LTE Technical Overview 61
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LTE Fundamental : Network Element
LTE Technical Overview 62
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LTE Fundamental : Network Element
LTE Technical Overview 63
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LTE Fundamental : Network Element
LTE Technical Overview 64
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LTE Fundamental : Network Element
LTE Technical Overview 65
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LTE Fundamental : Network Element
LTE Technical Overview 66
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LTE Fundamental : Interworking
LTE Technical Overview 67
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LTE and LTE-Advanced Standards
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Contents
• 3GPP TSG-RAN standardisation activities
• LTE Release 8&9 overviews
• LTE Release 10 (LTE-Advanced)
– Motivation
– Key requirements
– Key features
– Performance evaluations
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3GPP TSG-RANStandardisation Activities
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1999 2000 2001 2002 2003 2004 2005
Release 99
Release 4
Release 5
Release 6
1.28Mcps TDD
HSDPA
W-CDMA
HSUPA, MBMS
2006 2007 2008 2009
Release 7 HSPA+ (MIMO, HOM etc.)
Release 8
2010 2011
LTE
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
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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+
LTE
25 series
36 series LTE-A
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LTE and HSPA Evolutions
3GPP Release #
Pe
ak T
hro
ugh
pu
t (b
ps)
Release 5 Release 6 Release 7 Release 8 Release 9 Release 10 Release 11
10 M
100 M
1 G
10 G
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
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LTE Current Status
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LTE Release 8 & 9
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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
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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
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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
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LTE Release 10(LTE-Advanced)
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LTE Advanced : Background
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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
LTE Technical Overview 81
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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
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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
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Key Features in LTE Release 10
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Key Features in LTE Release 10
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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
f
CC
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Carrier and Spectrum Aggregation
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BW Extention
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Enhanced Multiantenna Techniques
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Uplink MIMO
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Downlink MIMO
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Coordinated Multipoint (CoMP) Transmission and Reception
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CoMP Techniques
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System level CoMP Joint Processing : A simple example
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Relaying
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Relaying
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LTE-Advanced Performance Highlights
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LTE-Advanced Performance Highlights
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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)
4.8
6.1
4.1
5.5
6.6
4.5
01234567
Cell
avera
ge(b
ps/H
z/cell)
3.0
ITU-R requirement
Rel-8 SU-MIMO 4x2L=1,2,3
Rel-10 MU-MIMO 4x2L=1,2,3
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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
Hills
100 m 200 m 300 m 400 m
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May 18, 2011 LTE World Summit 2011
Do
wn
link
Up
link
Pan
ora
ma
Vie
w
600Mbps
200Mbps
5 CCs2x2 SU-MIMO
2 CCs2x2 SU-MIMO
10 km/h
NTT DOCOMO Field Trial
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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
102
Summary LTE-AdvancedRelease 10
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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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