lte tutorial femtoforum part1

Download LTE Tutorial FemtoForum Part1

Post on 26-Dec-2015

11 views

Category:

Documents

0 download

Embed Size (px)

DESCRIPTION

LTE Tutorial

TRANSCRIPT

  • 1Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    LTE Tutorial part 1LTE Basics

    Marius Pesavento - marius.pesavento@mimoOn.deWillem Mulder - willem.mulder@mimoOn.de

  • 2Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Agenda

    Part 1, LTE Basics 9:30 10:30 Introduction to LTE FDD/TDD frame structures and reference signals Physical channels, logical channels PHY signal processing architecture H-ARQ processing, H-ARQ timing UE categories

    Part 2, Advanced topics in LTE 11:00 12:30 The LTE MIMO modes Codebook-based precoding Closed loop operation CQI reporting modes Using antenna port 5 (SDMA) techniques Simulation results Outlook LTE Advanced

    Q & A 12:30 13:00

  • 3Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    3G Evolution

    HSPA evolution Gradually improved performance at low additional cost in 5MHz spectrum

    allocation Next step: dual carrier allocation (10MHz)

    LTE LTE is new Radio Access Network (RAN) significantly improved performance in up to 20MHz allocation Peak data rates up to 300Mbps

    LTE-Advanced natural evolution of LTE, next major step toward IMT-Advanced support spectrum aggregation up to 100MHz and data rate up to 1Gbps

    SPRING 2011

  • 4Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    LTE Targets

    Cell-capacity (Control plane): 200 user per cell in 5MHz Peak data rate

    DL: 300MBit/s UL: 75 MBit/s

    Control plane latency: 50/100ms (idle to active) User Plane Latency:

  • 5Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    E-UTRA frequency bands

    TDDN/A2400 MHz-2300 MHz2400 MHz-2300 MHz40

    TDDN/A1920 MHz-1880 MHz1920 MHz-1880 MHz39

    TDDN/A2620 MHz2570 MHz2620 MHz2570 MHz 38

    TDDN/A1930 MHz1910 MHz1930 MHz1910 MHz 37

    TDDN/A1990 MHz1930 MHz1990 MHz1930 MHz 36

    TDDN/A1910 MHz1850 MHz1910 MHz1850 MHz 35

    TDDN/A2025 MHz2010 MHz 2025 MHz 2010 MHz34

    TDDN/A1920 MHz1900 MHz1920 MHz1900 MHz33

    ...

    FDD20768 MHz758 MHz798 MHz788 MHz14

    FDD21756 MHz746 MHz787 MHz777 MHz13

    FDD[TBD][TBD][TBD][TBD][TBD]12

    FDD23 MHz1500.9 MHz1475.9MHz1452.9 MHz1427.9MHz

    11

    FDD340 MHz 2170 MHz2110 MHz1770 MHz1710 MHz10

    FDD60 MHz1879.9 MHz1844.9MHz1784.9 MHz1749.9MHz9

    FDD10 MHz960 MHz925 MHz915 MHz880 MHz8

    FDD50 MHz2690 MHz2620 MHz2570 MHz2500 MHz7

    FDD35 MHz885 MHz875 MHz840 MHz830 MHz6

    FDD20 MHz894MHz869 MHz849 MHz824 MHz5

    FDD355 MHz2155 MHz2110 MHz1755 MHz 1710 MHz4

    FDD20 MHz1880 MHz1805 MHz1785 MHz1710 MHz 3

    FDD20 MHz1990 MHz1930 MHz1910 MHz1850 MHz 2

    FDD130 MHz2170 MHz2110 MHz 1980 MHz1920 MHz 1

    FDL_low-FUL_highFDL_low FDL_highFUL_low FUL_high

    Duplex Mode

    UL-DL Band separation

    Downlink (DL)eNode B transmit

    UE receive

    Uplink (UL)eNode B receive

    UE transmit

    E-UTRA Band

    UMTS band

    extension band

  • 6Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Basic Transmission Schemes

    Transmission Bandwidth 1.4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz

    Sampling Frequency 1.92 MHz 3.84 MHz 7.68 MHz

    15.36 MHz

    23.04 MHz 30.72 MHz

    FFT Size 128 256 512 1024 1536 2048

    #RBs (12 subcarrier)

    6 15 25 50 75100

    (110)

  • 7Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Frame Structure Type 1

    Frame Structure Type 1

    frame structure type 1 is applicable to FDD (frequency division duplex), full-duplex and half-duplex

    #0 #1 #2 #3 #18 #19

    one slot, Tslot = 15360*TS = 0.5 ms

    one radio frame, Tf = 307200*TS = 10 ms

    one subframeTransmission Time Interval

    (TTI)= 1ms

    TS basic time unit corresponding to sampling frequency 30.72MHz

  • 8Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Slot Structure

    normal cyclic prefix

    extended cyclic prefix, f = 15 KHz

    normal cyclic prefix #2normal cyclic prefix #1

    2048*TS144*TS 2048*TS2048*TS2048*TS2048*TS2048*TS2048*TS

    160*TS 144*TS144*TS144*TS144*TS144*TS

    slot

    #0 #6

    extended cyclic prefix

    #0 #5

    2048*TS512*TS2048*TS

    512*TS2048*TS512*TS2048*TS

    512*TS2048*TS512*TS2048*TS

    512*TS

    slot

  • 9Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    subframe 1 ms

    one radio frame, Tf = 307200*TS = 10 ms

    Frame Structure Type 2: TDD

    DL#0

    S#1

    UL#2

    UL/DL#3

    UL/DL#4

    S/DL#6

    DL#5

    UL/DL#7

    UL/DL#8

    UL/DL#9

    Downlinksubframe

    Uplinksubframe

    Special guardsubframe for

    DL to UL switch

    Special guardsubframe orDownlink SF

    Uplink orDownlinksubframe

    special subframe: DL to UL switching

    S#1 or #6

    DwPTSGP UpPTS

    DwPTS: DL pilot time slotshortend DL subframe

    (3,8,9,10,11, or 12 OFDM symbols) reference signals, primary sync and control, PDSCH

    GP: Guard period(1,2,3,4,7,8,9,10 OFDM symbols)

    UpPTS: UL pilot time slot(1 or 2 OFDM symbols)

    sounding reference or RACH

    SS

    SR

    S a

    ndC

    ontro

    lP

    SS

    0 1 2

  • 10Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Frame Structure Type 2: TDD

    Tx

    Rx

    Tx

    Rx

    DL UL Tx#2UL Tx

    #3GP

    UpP

    TS

    Dw

    PTS

    DL UL Rx#2UL Rx

    #3GP

    UpP

    TS

    Dw

    PTS

    DL Tx#0

    DL Tx#4

    DL Tx#6

    DL Tx#5G

    P

    UpP

    TS

    Dw

    PTS

    DL DL Rx#4DL Rx

    #6DL Rx

    #5GP

    UpP

    TS

    Dw

    PTS

    pathdelay

    pathdelay

    UL/DL switching must be accomplished within the CP length

    (e.g. if path delay is zero)

  • 11Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    DwPTS, GP, UpPTS length(in OFDM symbols)

    FormatNormal CP Extended CP

    DwPTS GP UpPTS DwPTS GP UpPTS

    0 3 10

    1

    38

    666.7s 200Km

    11 9 4 8 3

    2 10 3 9 2

    3 11 2 10 1

    4 12 1 3 7

    25 3 9

    2

    8 2

    6 9 3 9 1

    7 10 2 - - -

    8 11 1 - - -

  • 12Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Resource Blocks

    7 OFDM symbols

    12 subcarriers

    frame structure 1

    normal cyclic prefix

    f = 15 KHz

    DC

    1DLRB Nresource block

    resource block 0

    all subframes

  • 13Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Physical ChannelsDownlink (DL)

    Physical Broadcast Channel (PBCH) System Information (Master Information Block

    MIB) approx. every 40 ms Physical Downlink Control Channel (PDCCH)

    DL Control Information Format (DCI-format), DL-grants (current TTI), UL-grants (+4 TTI), uplink power control

    Physical DL Shared Channel (PDSCH) DL transport blocks (TBs), DL Control Information,

    System Information Block (SIB), Paging Channel (PCH), Multicast Channel (MCH)

    Physical Control Format Indicator Channel (PCFICH) location of the PDCCH

    Physical Hybrid ARQ Indicator Channel (PHICH) UL ACK/NACK

    Physical Multicast Channel (PMCH)

  • 14Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    Physical ChannelsUplink (UL)

    Physical Random Access Channel (PRACH) UL timing estimation (path delay), UL

    scheduling request (SR) Physical Uplink Control Channel (PUCCH)

    Channel Quality Indicater (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), ACK/NACK, SR

    Physical Uplink Shared Channel (PUSCH) UL TBs, ACK/NACK, CQI, PMI, RI, SR

  • 15Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    PHY Signals

    Downlink Primary and Secondary Synchronization Signal

    cell-search, DL-frame synchronization, time, frequency, drift, Cell-specific reference signals (antenna port 0 - 3),

    orthogonal (non-overlapping) in time-frequency-domain MIMO channel estimation, fine frequency estimation, UL-CQI

    estimation

    UE-specific reference signals implicit signaling of DL-transmit beamforming weights

    Uplink Demodulaton Reference Signal Sounding Reference Signal

    UL wideband CQI estimation Random-Access Sequence

    for UL timing synchronization

  • 16Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    one antenna port(frame structure 1,

    normal cyclic prefix)

    reference signal 0

    two antenna ports(frame structure 1,

    normal cyclic prefix)

    reference signal 0

    reference signal 1

    not used for transmissionon this antenna port

    slot slot slot

    Cell-Specific Reference Signals

    carrier frequency: 2.6GHzLTE requirement

    max speed: 350km/hmax Doppler frequency: 843Hz

    Clarke's modelcoherence time: T > 9/(16 fm)

    approx. 3 OFDM symbols

    pilot spacing in frequencycoherence bandwidth B 6x15KHz

    B 1 / (2 ) delay spead :

    1 / (2 B) =1.77sec ( 54 smpls; corresp. to 531 meter )

    Port 0 Port 1

    Port 0Tx

    Tx

  • 17Marius Pesavento, Willem Mulder, Femto Forum Plenary, June 2010, Reading, UK mimoOn

    reference signal 0

    reference signal 1

    not used for transmissionon this antenna port

    referenc