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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    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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