lte tutorial femtoforum part1

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