lte and lte advanced_workshop

8/3/2019 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

[email protected]

USA

200N. Westlake Blvd, #202Westlake Vill age

Los Angeles CA 91362, USATel +1 805 413 4127

LTE and LTE AdvancedDaniel Garca-Als, Iain Stirling & Bob Stewart


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Steepest Ascent Ltd. www.steepestascent.com 2

3GPP Evolution
http://www.steepestascent.com/http://www.steepestascent.com/


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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.


4/16Steepest Ascent Ltd. www.steepestascent.com 4

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)



Multi-User MIMO (MU-MIMO)

Codebook based beamforming to multiple UEs simultaneously in the

same time and frequency resources:

beamform

beamform


codebook

2, 3 or 4


layers

codebook


(shared resources)

UE

UE



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



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.



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



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)



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



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


codebook

2, 3 or 4 layers

DCI format 4 message



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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