Toward LTE Commercial Launch and Future Plan for LTE Enhancements (LTE-Advanced)
LTE and LTE Advanced_Workshop
Transcript of LTE and LTE Advanced_Workshop
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Europe & APAC
94 Duke StreetGlasgow G4 0UW
Scotland UKTel and Fax +44 (0)141 552 8855
USA
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Los Angeles CA 91362, USATel +1 805 413 4127
LTE and LTE AdvancedDaniel Garca-Als, Iain Stirling & Bob Stewart
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3GPP Evolution
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LTE (Rel-8) General Requirements
Data rates (for a 20 MHz bandwidth):
100 Mbps in DL
50 Mbps in UL Spectral efficiency associated to data rates shown above:
5 bits/sec/Hz in DL
2.5 bits/sec/Hz in UL
Latency smaller than 5 msec for small IP packets;
Voice service: at least same quality as WCDMA/HSPA.
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LTE Rel-8 Technology
Harmonised TDD and FDD modes;
OFDM Downlink and SC-FDMA Uplink;
Adaptive modulation and coding using QPSK / 16QAM / 64QAM andHybrid ARQ in both Uplink and Downlink;
2 or 4 transmit antennas in Downlink including spatial multiplexing:
UE
precod
ing
2 or 4 antennas supported
codebook
2, 3 or 4 layers
codebook selection suggestion (PMI)
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Multi-User MIMO (MU-MIMO)
Codebook based beamforming to multiple UEs simultaneously in the
same time and frequency resources:
beamform
beamform
2 or 4 antennas supported
codebook
2, 3 or 4
codebook selection suggestion (PMI)
layers
codebook
codebook selection suggestion (PMI)
(shared resources)
UE
UE
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IMT Advanced Technologies
The following technologies were submitted to the ITU for consideration
as IMT Advanced technologies:
IEEE 802.16m (WirelessMAN-Advanced)
3GPP LTE Release 10 & beyond (LTE-Advanced)
Both technologies have now been approved as IMT Advancedtechnologies (October 2010).
LTE-R8 LTE-R10LTE-R9
TR 36.912 study
Release 9 features
Release 10 features
LTE-Advanced
meeting
IMT-Advanced
Release 10 featuresproposing
Dec 2010Dec 2009Dec 2008
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LTE Release 10 features
Carrier aggregation to give up to 100MHz bandwidth;
Downlink transmission with 8 antennas and layers;
Uplink multi-antenna transmission with up to 4 antennas;
Relaying from Relay Nodes (RN) to eNB;
Self Optimising Networks (SON) enhancements.
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LTE Rel-10 carrier aggregation
Multiple Component Carriers (CC) can be aggregrated for bandwidths
up to 100MHz:
Asymmetric uplink/downlink is not permitted for Release 10, but it isplanned to be supported in the future.
Rel 8
Rel 10
Rel 8
20MHz 20MHz 20MHz20MHz20MHz
Rel 10
10MHz20MHz 2.5MHz
Rel 10
20MHz
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LTE Rel-10 Downlink spatial multiplexing
Up to 8 transmit antennas and 8 spatial layers;
Codebook based spatial multiplexing extended to 4 layers per
Transport Block (here we show 3 layer per TB example):
Mapping for up to 4 layers is Release 8 compatible.
Channel State Information RS (CSI-RS) supports 8 antennas.
beamform
8 antennas
UE
layerdemap6 layers
2 codewordsbeamform
beamform
beamform
beamform
p
recoding
layermap
codebookcodebook selection suggestion (PMI)
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LTE Rel-10 UE-specific beamforming
Up to 8 transmit antennas and 8 spatial layers;
8-layer non codebook based spatial multiplexing (ports 7 to 14):
beamf
orm
8 antennas
UE
layerdema
p
6 layers
2 codewordsbeamform
beamform
beamform
beamform
beamform
layermap
arbitrary beamforming vectors
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LTE Rel-10 Uplink spatial multiplexing
Support for up to 4 layers, 2 per codeword with codebook basedprecoding:
DCI format 4 (multi-antenna PUSCH scheduling) indicates the
codebook entry to use, as well as MCS for the 1st and 2nd codeword.
UE
precoding
2 or 4 antennas supported
codebook
2, 3 or 4 layers
DCI format 4 message
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LTE Release 11
LTE Advanced study evaluated Co-ordinated Multi-point transmissionand reception:
Joint Processing Coordinated Multipoint (JP-CoMP)
Co-ordinated scheduling / co-ordinated beamforming (CS/SB)
LTE Rel 10 does not introduced any standardised support for CoMP;
CSI-RS design for Rel 10 was designed to allow for accurate inter-cellmeasurements to aid CoMP;
Release 11 includes a study on standardised CoMP support:
Co-ordination support on X2 interface;
CSI feedback about a DL, reported to another eNodeB;
Remote Radio Heads (RRH) that arent full cells, but
participate in multi-site CoMP under control of one cell.
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Co-ordinated Multipoint: JP-CoMP
Joint Processing Coordinated Multipoint (JP-CoMP): data available atmultiple cells. Two techniques:
Multiple eNBs transmit to one UE using UE-specific reference signals:
eNB selection per transmission (UE connected to multiple eNB).
beamform
beam
form
arbitrary beamforming vector
arbitrary beamforming vector
UE
layermap
combining
1 codewordco-ordination
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Co-ordinated Multipoint: CS/CB-CoMP
Co-ordinated scheduling / co-ordinated beamforming (CS/SB):
Data only available at one eNB;
eNBs jointly decide scheduling of transmission in time,
frequency and space:
beamform
arbitrary beamforming vectors
UE
layermap co
mbining
1 codeword
co-ordination
PMI/CQI/RI
PMI/CQI/RI
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LTE Advanced Spectral Efficiency (TS36.912)
Urban micro (1km cells, outdoor to indoor):
Urban macro (5km cells, outdoor to vehicular):
Cell average [b/s/Hz/cell] Cell edge [b/s/Hz]Scheme and antenna
configuration
ITURequirement(Ave./Edge)
Numberof
samplesL=1 L=2 L=3 L=1 L=2 L=3
MU-MIMO 4 x 2 (C) 2.6 / 0.075 8 3.5 3.2 2.9 0.10 0.096 0.087
MU-MIMO 4 x 2 (A) 2.6 / 0.075 3 3.4 3.1 2.8 0.12 0.11 0.099
CS/CB-CoMP 4 x 2 (C) 2.6 / 0.075 5 3.6 3.3 3.0 0.11 0.099 0.089
JP-CoMP 4 x 2 (C) 2.6 / 0.075 1 4.5 4.1 3.7 0.14 0.13 0.12
MU-MIMO 8 x 2 (C/E) 2.6 / 0.075 4 4.2 3.8 3.5 0.15 0.14 0.13
Cell average[b/s/Hz/cell]
Cell edge [b/s/Hz]Scheme and antenna
configuration
ITURequirement(Ave./Edge)
Numberof
samples L=1 L=2 L=3 L=1 L=2 L=3
MU-MIMO 4 x 2 (C) 2.2 / 0.06 7 2.8 2.6 2.4 0.079 0.073 0.066
CS/CB-CoMP 4 x 2 (C) 2.2 / 0.06 6 2.9 2.6 2.4 0.081 0.074 0.067
JP-CoMP 4 x 2 (A) 2.2 / 0.06 1 3.0 2.7 2.5 0.080 0.073 0.066
CS/CB-CoMP 8 x 2 (C) 2.2 / 0.06 3 3.8 3.5 3.2 0.10 0.093 0.084
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TS36.912 antenna geometry assumptions
(A)Uncorrelated co-polarized: co-polarized antennas separated 4 wavelengths:
illustration for 4 Tx: | | | |
(B)Grouped co-polarized: Two groups of co-polarized antennas. 10 wavelengths between center of eachgroup. 0.5 wavelength separation within each group:
illustration for 4 Tx: || ||
(C)Correlated co-polarized: 0.5 wavelengths between antennas:
illustration for 4 Tx: ||||
(D)Uncorrelated cross-polarized: columns with +-45deg linearly polarized antennas, columns separated4 wavelengths:
illustration for 4 Tx: X X
(E) Correlated cross-polarized: columns with +-45deg linearly polarized antennas, columns separated 0.5wavelengths:
illustration for 4 Tx: XX
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