1- OEA000100 LTE Air Interface ISSUE 1.03.pdf

8/10/2019 1- OEA000100 LTE Air Interface ISSUE 1.03.pdf

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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page1

Contents

1. The Air interface

2. LTE Radio Interface General Principles


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Contents




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Contents

1. The Air Interface

1.1 Evolution of Cellular Networks

1.2 3GPP Releases

1.3 Radio Interface Techniques

1.4 Transmission Modes

1.5 Spectrum Usage

1.6 Channel Coding in LTE1.7 Principles of OFDM


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage



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Evolution of Cellular Networks


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2.5G and 2.75G GSM/GPRS

Systems

System Service Theoretical DataRate

Typical Data Rate

2G GSM Circuit SwitchedData Service

9.6kbit/s or14.4kbit/s

9.6kbit/s or14.4kbit/s

2.5G GPRS Packet SwitchedData

171.2kbit/s 4kbit/s to 50kbit/s

2.75G EDGE Packet SwitchedData

473.6kbit/s 120kbit/s


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Third Generation Mobile Systems

UMTSTD-CDMA

TD-SCDMA


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Fourth Generation Mobile Systems

WiMAX802.16m


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3GPP Releases

GPRS171.2kbit/s

Phase 2+(Release 97)

EDGE473.6kbit/sRelease 99

UMTS2Mbit/s

Release 99

HSDPA14.4Mbit/sRelease 5

HSUPA5.76Mbit/s

Release 6

HSPA+28.8Mbit/s42Mbit/s

Release 7/8

LTE+300Mbit/s

Release 8


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Release 5 - HSDPA


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Release 6 - HSUPA


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Release 7 - HSPA+


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Release 8 - HSPA+ and LTE

UE

UTRAN

RNCNode B

Iub

eNB

E-UTRAN


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Release 9 and Beyond


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage



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Radio Interface Techniques

TDMA CDMA


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Frequency Division Multiple Access


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Time Division Multiple Access


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Code Division Multiple Access


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage



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Transmission Modes

Time Division Duplex


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage



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GSM Bands

Operating Band FrequencyBand

Uplink Frequency(MHz)

DownlinkFrequency (MHz)

GSM 400 450 450.4 - 457.6 460.4 - 467.6

GSM 400 480 478.8 - 486.0 488.8 - 496.0

GSM 850 850 824.0 - 849.0 869.0 - 894.0

GSM 900 (P-GSM) 900 890.0 - 915.0 935.0 - 960.0

GSM 900 (E-GSM) 900 880.0 - 915.0 925.0 - 960.0

GSM-R (R-GSM) 900 876.0 - 880.0 921.0 - 925.0

DCS 1800 1800 1710.0 - 1785.0 1805.0 - 1880.0

PCS 1900 1900 1850.0 - 1910.0 1930.0 - 1990.0


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.Page30

UMTS TDD Frequency Bands

Frequency Band

1900 - 1920

2010 - 2025

1850 - 1910

1930 - 1990

1910 - 1930

2570 - 2620


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LTE Release 8 BandsBand Duplex F DL_low

(MHz)

FDL_high

(MHz)

N Offs-DL NDL FUL_low

(MHz)

FUL_high

(MHz)

NOffs-UL N UL

1 FDD 2110 2170 0 0-599 1920 1980 18000 18000-185992 FDD 1930 1990 600 600-1199 1850 1910 18600 18600-191993 FDD 1805 1880 1200 1200-1949 1710 1785 19200 19200-199494 FDD 2110 2155 1950 1950-2399 1710 1755 19950 19950-203995 FDD 869 894 2400 2400-2649 824 849 20400 20400-206496 FDD 875 885 2650 2650-2749 830 840 20650 20650-207497 FDD 2620 2690 2750 2750-3449 2500 2570 20750 20750-214498 FDD 925 960 3450 3450-3799 880 915 21450 21450-21799

9 FDD 1844.9 1879.9 3800 3800-4149 1749.9 1784.9 21800 21800-2214910 FDD 2110 2170 4150 4150-4749 1710 1770 22150 22150-2274911 FDD 1475.9 1500.9 4750 4750-4999 1427.9 1452.9 22750 22750-2299912 FDD 728 746 5000 5000-5179 698 716 23000 23000-2317913 FDD 746 756 5180 5180-5279 777 787 23180 23180-2327914 FDD 758 768 5280 5280-5379 788 798 23280 23280-23379

17 FDD 734 746 5730 5730-5849 704 716 23730 23730-23849

33 TDD 1900 1920 36000 36000-36199 1900 1920 36000 36000-3619934 TDD 2010 2025 36200 36200-36349 2010 2025 36200 36200-36349

35 TDD 1850 1910 36350 36350-36949 1850 1910 36350 36350-3694936 TDD 1930 1990 36950 36950-37549 1930 1990 36950 36950-3754937 TDD 1910 1930 37550 37550-37749 1910 1930 37550 37550-3774938 TDD 2570 2620 37750 37750-38249 2570 2620 37750 37750-3824939 TDD 1880 1920 38250 38250-38649 1880 1920 38250 38250-3864940 TDD 2300 2400 38650 38650-39649 2300 2400 38650 38650-39649


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Carrier Frequency EARFCN

Calculation


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage



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Transport Block CRC


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CRC Parity Bits


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Code Block Segmentation and CRCAttachment


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Example


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Channel Coding Transport Channel Coding Options

Transport Channel Coding Method Rate

DL-SCH

Turbo Coding 1/3UL-SCH

PCH

MCH

BCH Tail Biting Convolutional Coding 1/3


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Channel CodingControl Information Coding Options

Control Information Coding Method Rate

DCI Tail Biting Convolutional Coding 1/3

CFI Block Code 1/16

HI Repetition Code 1/3

UCI Block Code Variable

Tail Biting Convolutional Coding 1/3


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Repetition Coding

1

1 1 1

ACK

RepetitionCoding

Orthogonal sequences

0 0 0

0

NACK

Orthogonal sequences


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Block Coding

CFI CFI Codeword < b 0 , b1 , , b 31 >

1

2

3

4 (Reserved)


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Convolutional Encoding Rate Convolutional Encoder


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Convolutional Coding Example

Input S1 S2 G 0 G 1

0 0 0 0 01 0 0 1 1

1 1 0 0 1

0 1 1 0 1


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Coding Comparison Chart

Standard Convolutional Coding Tail Biting Convolutional Coding

Initializes the shift register with zeros. Initializes the shift register with the last bits

of the stream, i.e. zeros are not added forinitialization.

Padded with zeros. The shift register finishes, such that the last bits of input are the same as what was usedto initialize the shift registers.


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Initializing Tail Biting ConvolutionalEncoding


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LTE 1/3 Rate Tail BitingConvolutional Coding


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LTE Turbo Coding


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Rate Matching

d k (1)

d k (0)

d k

(2)

Sub-blockInterleaver

Sub-blockInterleaver

Sub-block

Interleaver


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LTE Sub-block Interleaver

Number of Columns Inter-column Permutation Pattern

32 < 0, 16, 8, 24, 4, 20, 12, 28, 2, 18, 10, 26, 6,22, 14, 30, 1, 17, 9, 25, 5, 21, 13, 29, 3, 19,11, 27, 7, 23, 15, 31 >


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Code Block Concatenation


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Contents



1.2 3GPP Releases



1.5 Spectrum Usage

1.6 Channel Coding in LTE

1.7 Principles of OFDM


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Principles of OFDM


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OFDM Subcarriers


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Inverse Fast Fourier Transform

SubcarrierModulation

IFFT

Inverse FastFourier

Transform


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Fast Fourier Transform

CodedBits

Parallelto

Serial


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LTE Channel and FFT Sizes

ChannelBandwidth

FFT Size SubcarrierBandwidth

Sampling Rate

1.4MHz 128

15kHz

1.92MHz

3MHz 256 3.84MHz

5MHz 512 7.68MHz

10MHz 1024 15.36MHz

15MHz 1536 23.04MHz

20MHz 2048 30.72MHz


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OFDM Symbol Mapping


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OFDMPeak to Average Power Ratio


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Time Domain Interference


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Inter Symbol Interference

DelayedSignal


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Cyclic Prefix


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Questionsl Which release of the 3GPP specifications includes the initial

release of LTE?

a. Release 6.

b. Release 7.c. Release 8.

a. Release 9.


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Questionsl What is the maximum size that a Turbo coder can handle in LTE?

a. 1024bits.

b.2048bits.

c. 5512bits.

d.6144bits.


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Questionsl Name the four main types of channel coding (FEC methods)

used in LTE.


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Contents




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Contents


2.1 The Uu Interface

2.2 LTE Radio Interface Protocols

2.3 LTE Channel Structure

2.4 LTE Frame Structure

2.5 OFDM Signal Generation

2.6 Downlink OFDMA

2.7 LTE Physical Signals


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Contents







2.6 Downlink OFDMA



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Contents







2.6 Downlink OFDMA



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LTE Control Plane and User Plane


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NAS Signaling


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Radio Resource Control


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Radio Link Control


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Physical Layer


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Contents







2.6 Downlink OFDMA



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LTE Channels


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Control Logical Channels


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CCCH and DCCH Signaling


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Traffic Logical Channels


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LTE Release 8 Transport Channels

BCH

eNBUE

PCH

DL-SCH

RACH

UL-SCH


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Downlink Physical Channelsl PBCH (Physical Broadcast Channel)

l PCFICH (Physical Control Format Indicator Channel)

l PDCCH (Physical Downlink Control Channel)

l PHICH (Physical Hybrid ARQ Indicator Channel)

l PDSCH (Physical Downlink Shared Channel)


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Radio Channels


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Uplink Channel Mapping


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Contents




2.3 LTE Channel Structure2.4 LTE Frame Structure


2.6 Downlink OFDMA



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LTE Frame Structure


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Normal and Extended Cyclic Prefix


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Downlink CP Parameters

Configuration CP Length (T s) Time DelaySpread

Normal CyclicPrefix

f = 15kHz 160 for slot 0 ~ 5.208 ! s ~ 1.562km

144 for slot 1, 2, " 6 ~ 4.688 ! s ~ 1.406km

Extended CyclicPrefix

f = 15kHz 512 for slot 0, 1, " 5 ~16.67 ! s ~ 5km

f = 7.5kHz 1024 for 0, 1, 2 ~ 33.33 ! s ~ 10km


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Normal CP Configuration


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Type 2 TDD Radio Frame


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Type 2 Radio Frame Switching Points

Configuration SwitchingPointPeriodicity

Subframe Number

0 1 2 3 4 5 6 7 8 9

0 5ms D S U U U D S U U U

1 5ms D S U U D D S U U D2 5ms D S U D D D S U D D

3 10ms D S U U U D D D D D

4 10ms D S U U D D D D D D

5 10ms D S U D D D D D D D

6 5ms D S U U U D S U U D


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Contents






2.6 Downlink OFDMA



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Codeword LayerandAntennaPort


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Codeword, Layer and Antenna PortMapping


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved.

Scrambling

Page106


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Scrambling


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Modulation Mapper


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64 QAM Modulation Mapper

I

Q

1 3 5 7-1-3-5-7

1

3

5

7

-1

-3

-5

-7

000011 000001 001001 001011

000010 000000 001000 001010

000110 000100 001100 001110

000111 000101 001101 001111

010011 010001 011001 011011

010010 010000 011000 011010

010110 010100 011100 011110

010111 010101 011101 011111

100011

100010

100110

100111

110011

110010

110110

110111

100001

100000

100100

100101

110001

110000

110100

110101

101001

101000

101100

101101

111001

111000

111100

111101

101011

101010

101110

101111

111011

111010

111110

111111

64QAM


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Layer Mapper Configuration

Mapper Configuration Layers (v) Antenna Ports (P)

Single Antenna v=1 P=1

Transmit Diversity v=P P # 1 (2 or 4)

Spatial Multiplexing 1 $ v $ P P # 1 (2 or 4)


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LTE Precoding Options

Spatial Multiplexing Codebook for


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Spatial Multiplexing Codebook forPrecoding - 2 Antenna Ports

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Codebook Index Number of layers

1 2

0

1

1

2

1

10

01

2

1

111

2

1 11

11

21

2

j

1

2

1 j j

11

21

3 j1

2

1

-


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Contents






2.6 Downlink OFDMA



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OFDMA in LTEFrequency

ChannelBandwidthE.g. 3MHz

Time

Device is allocated oneor more PRB (PhysicalResource Blocks)

PRB consists of 12subcarriers for 0.5ms

OFDMA


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Downlink PRB Parameters

Configuration N SCRB N Symb DL

Normal Cyclic Prefix f = 15kHz

12

7

Extended CyclicPrefix

f = 15kHz 6

f = 7.5kHz 24 3


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Contents






2.6 Downlink OFDMA



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Downlink Cell ID

d f


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PSS and SSS Location for FDD


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E l f SSSI di


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Example of SSS Indices

N ( )1 ID m 0 m 1 N( )1 ID m 0 m 1 N

( )1 ID m 0 m 1 N

( )1 ID m 0 m 1 N

( )1 ID m 0 m 1

0 0 1 34 4 6 68 9 12 102 15 19 136 22 27

1 1 2 35 5 7 69 10 13 103 16 20 137 23 28

2 2 3 36 6 8 70 11 14 104 17 21 138 24 29

3 3 4 37 7 9 71 12 15 105 18 22 139 25 30

. . . . .

. . . . 167 2 9

33 3 5 67 8 11 101 14 18 135 21 26

SSS S bli


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SSS Scrambling

C


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Contents


2.8 Downlink Reference Signals

2.9 Downlink LTE Physical Channels

2.10 Downlink Control Signaling2.11 LTE Cell Search Procedure

2.12 Uplink Transmission Technique

2.13 OFDMA Verses SC-FDMA

2.14 Uplink LTE Physical Channels

2.15 Timing Relationships

D li kR f Si l


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Downlink Reference Signalsl Cell Specific (non-MBSFN)

l MBSFN (MBMS service over Single Frequency Network)

l UE Specific

Cell Specific Reference Signals


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p gOne Antenna Port



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p gCell ID Offset



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p g Two Antenna Port Configuration


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MBFSNR f Sig l


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MBFSN Reference Signals

UE Specific Reference Signals


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UE Specific Reference Signals

Contents


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Contents


2.8 Downlink Reference Signals


2.10 Downlink Control Signaling2.11 LTE Cell Search Procedure





PBCH(PhysicalBroadcastChannel)


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PBCH (Physical Broadcast Channel)

B C C H ( B roadca s t I

n fo r m a t io n )

eNB

UE

MIB to PBCH Mapping (FDD and


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MIB

CRCChannel CodingRate Matching

ScramblingModulation

Layer MappingPrecoding

Mapping to REs

10ms Frame

Page133

Normal CP)

PBCH

CFICH (Physical Control Format


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Indicator Channel) - CFI Mapping

CFI Value Number of OFDM Symbols Assigned to DPCCH

N > DL RB 10 N DL RB 10

1 1 2

2 2 3

3 3 4

CFI to PCFICH Mapping


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CFI to PCFICH Mapping

NRBDL

k

k =(N sc /2) (NID mod 2N RB)

k =k

k =k + N RB)/2 Nsc /2k =k + 2N RB)/2 Nsc /2

k =k + 3N RB)/2 Nsc /2

RB DL

DL RB

DL

DL

RB

RB

Cell

OFDM Symbols

allocated toPDCCH

PCFICH

Reserved RSs

CFI Codewords


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CFI Codewords

CFI CFI Codeword < b 0 , b 1 , , b 31 >

1

2

3

4 (Reserved)

PDCCH (Physical Downlink Control


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Channel)

5 M

H z

( 2 5 R e s o u r c e

B l o c k s )


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PDCCH to Control Region Mapping


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PDCCH to Control Region Mapping0

0x 0 R

01

R 1 x11

x 2 R2

2R 2 x

x R

R x

x R

R x3 43 4x 4 R3 4

5R 5 x6 5

6 5x 7 R6 76 7R 7 x

x R

R x

x R

R x

3

R B

R B

PCFICH

PHICH

CCE Allocation Levels


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CCE Allocation Levels

SearchSpaces


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Search Spaces

0 1 2 3 4 5 976 8

Common Search Space UE-specific Search Space

1 - CCE

2 - CCE4 - CCE

8 - CCE

CCE

CandidateAggregation Setfor CommonControl

CandidateAggregation Set

for UE-specificControl

PHICH (Physical Hybrid Indicator


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Channel)l Frame Structure Type 1

l Frame Structure Type 2 (TDD)

PHICH Mapping


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PHICH Mapping

PHICHMappingEquation

PCFICH

Extended PHICH Example


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Extended PHICH Example

Subframe

5 M H z

( 2 5 R e s o u r c e

B l o c k s )

ExtendedPHICH

NormalPHICH

PDSCH (Physical Downlink Shared


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Channel)

Contents


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Contents

2. LTE Radio Interface General Principles2.8 Downlink Reference Signals


2.10 Downlink Control Signaling

2.11 LTE Cell Search Procedure





Downlink Control Signaling


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Downlink Control SignalingDCI Format Usage

0 Scheduling of PUSCH

1 Scheduling of one PDSCH codeword

1A Compact scheduling of one PDSCH codeword and random access procedure initiated by a PDCCH order

1B Compact scheduling of one PDSCH codeword with precodinginformation (Rank-1 transmission)

1C Very compact scheduling of one PDSCH codeword

1D Compact scheduling of one PDSCH codeword with precoding and power offset information (multi-user MIMO)

2 Scheduling PDSCH to UEs configured in closed-loop spatialmultiplexing MIMO

2A Scheduling PDSCH to UEs configured in open-loop spatialmultiplexing MIMO

3 Transmission of TPC (Transmit Power Control) commands forPUCCH and PUSCH with 2-bit power adjustments

3A Transmission of TPC (Transmit Power Control) commands forPUCCH and PUSCH with 1-bit power adjustments

DCIFormat0


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DCI Format 0l Flag for format0/format1A differentiation - 1 bit, where value 0

indicates format 0 and value 1 indicates format 1A.

l Hopping flag.

l

Resource block assignment and hopping resource allocation.l Modulation and coding scheme and redundancy version.

l New data indicator.

l TPC command for scheduled PUSCH.

DCIFormat0 (cont.)


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DCI Format 0 (cont.)l Cyclic shift for DM RS.l UL index - This field is present only for TDD operation with

uplink-downlink configuration 0.

l

DAI (Downlink Assignment Index) - This field is present only for TDD operation with uplink-downlink configurations 1-6.

l CQI Request.

DCIFormat1


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DCI Format 1l Resource allocation header (resource allocation type 0 / type 1).l Resource block assignment.

l Modulation and coding scheme.

l HARQ process number.l New data indicator.

l Redundancy version.

DCIFormat1 (cont.)


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DCI Format 1 (cont.)l TPC command for PUCCH.l Downlink Assignment Index - This field is present in TDD.

Ambiguous Sizes of Information Bits

12, 14, 16 ,20, 24, 26, 32, 40, 44, 56


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Initial Procedures


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Cell Search


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Physical Cell Identities


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y

eNB

eNB

eNB

PSS - One of 3 Identities

SSS - One of 168Group Identities

504 Unique CellIdentities

PSS Correlation


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SSS Correlation


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SI Block Type 1


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ypSIB1 (System Information Block Type 1)PLMN Identity List

Tracking Area CodeE-CGI (Evolved Cell Global Identity)Cell Barred IndicationIntra Frequency ReselectionCSG IndicationCSG IdentityQrxlevminoffsetP-MaxFrequency Band Indicator

Scheduling Info ListSIB Window Length (1, 2, 5, 10, 15, 20, 40ms)System Info Value Tag

PLMN Selection


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3G VisitedPLMN

LTE VisitedPLMN

LTE HomePLMN

eNB

eNB

Node B

UE

Cell Selection


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Contents


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SC-FDMA Subcarrier MappingConcept


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Time Domain

CPInsertion

SubcarrierMapping

Frequency Domain

Page164

Concept

DFTSymbols

Time Domain

IDFT

000

0

000


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SC-FDMA and the eNB


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Contents


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SC-FDMA vs. OFDMA


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Feature SC-FDMA OFDMA

Low PAPR Y X

Performance X Y

Uplink MIMO X Y


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PRACH (Physical Random AccessChannel)


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Channel)

PRACH Guard Period


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Random Access PreambleParameters


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ParametersPreambleFormat

AllocatedSubframes

TSEQ(Ts)

TCP(Ts)

TCP (! s) TGT (Ts)

TGT (! s)

Max.DelaySpread(! s)

Max CellRadius(km)

0 1 24576 3168 103.125 2976 96.875 5.208 14.531

1 2 24576 21024 684.375 15840 515.625 16.666 77.344

2 2 49152 6240 203.125 6048 196.875 5.208 29.531

3 3 49152 21024 684.375 21984 715.625 16.666 102.65

4 (TDD) SpecialFrame

4096 448 14.583 576 18.75 16.666 4.375

PRACH FDD Formats


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PRACH Configuration


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CP

Subframe0

Subframe1

Subframe2

RB 24

RB 0

ZC

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839Subcarriers1.25kHz(6RBs)

PRACH Configuration Index


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PRACHConfiguration

Index

PreambleFormat

SystemFrame

Number

SubframeNumber

0 0 Even 1

1 0 Even 4

2 0 Even 7

3 0 Any 1

4 0 Any 4

5 0 Any 7

6 0 Any 1, 6

7 0 Any 2 ,78 0 Any 3, 8

9 0 Any 1, 4, 7

10 0 Any 2, 5, 8

11 0 Any 3, 6, 9

12 0 Any 0, 2, 4, 6, 8

13 0 Any 1, 3, 5, 7, 9

14 0 Any 0, 1, 2, 3, 4,5, 6, 7, 8, 9

15 0 Even 9

. . . .

. . . .

63 3 Even 9


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PUSCH (Physical Uplink SharedChannel)


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Channel)

PDSCHSymbol

Mapping

Multiplexing Control Signaling


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FDD Timing


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Example of TDD Configuration 2


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Contents


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2. LTE Radio Interface General Principles2.16 Uplink Reference Signals

2.17 Uplink Control Signaling

2.18 LTE Random Access Procedure

2.19 Uplink Power Control

2.20 Paging Procedures

2.21 HARQ Operation

2.22 Diversity Options

Uplink Reference Signals


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Demodulation Reference Signal


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l Sequence length - This is part of the uplink allocation.l Sequence Groups (0-29) - This is cell specific.

l Sequence - Each group contains one sequence for each length

up to 5 PRB, and two sequences for each length from 6PRB.

l 12 Cyclic Shift options.


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PUSCH DRS


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Slot SlotSubframe

RRRRRR

RRRRRR

1 2 S u b c a r r

i e r s

RRRRRR

RRRRRR

PUSCH DRS (Extended CP)


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1 2 S u b c a r r

i e r s

Requirement for SRS


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5 M H z

( 2 5 R e s o u r c e

B l o c k s )

SRS Frequency Hopping


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5 M H z

( 2 5 R e s o u r c e

B l o c k s )

SRS Allocationb l


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Subframe

SRS Symbol

Contents


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2.21 HARQ Operation



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PUCCH Format 2a and 2bACK/NACK Coding


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l They are bit scrambled by a UE specific scrambling sequence.l The initialization of the scrambling sequence generator is the

same as that of the PUSCH.

l BPSK (2a) or QPSK (2b) modulation for the 2nd RS symbol in

each slot is used. This carries ACK/NACK.

l Format 2a: QPSK CQI +BPSK ACK/NACK

l Format 2b: QPSK CQI +QPSK ACK/NACK

Contents


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2.21 HARQ Operation


LTE Random Access Procedure


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Random Access RRC SignalingProcedure


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UE eNB

PRACH Probing


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PRACHPowerControl

Parameters for Random AccessParameter Description


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PRACH-ConfigInfo This contains: prach-Conf igIndex, highSpeedFlag,

zeroCorrelationZoneConfig and prach-FreqOffsetra-Response WindowSize Random access response window size in subframes

(sf2, sf3, sf4, sf5, sf6, sf7, sf8 or sf10)

powerRampingStep Power ramping factor (dB0, dB2,dB4 or dB6)

preambleTransMax Maximum number of preamble transmission (n3, n4,n5, n6, n7, n8, n10, n20, n50, n100 or n200)

preambleInitialReceivedTargetPower Initial preamble power (-120, -118, -116, -114, -112,-110, -108, -106, -104, -102, -100, -98, -96, -94, -92or -90 dBm)

DELTA_PREAMBLE Preamble format based offset

maxHARQ-Msg3Tx Maximum number of Msg3 HARQ transmissions (1

to 8)mac-ContentionResolutionTimer Contention Resolution Timer (sf8, sf16, sf24, sf32,

sf40, sf48, sf56 or sf64)

numberOfRA-Pre ambles Number of preambles used (n4, n8, n12, n16 ,n20,n24, n28, n32, n36, n40, n44, n48, n52, n56, n60 orn64)

sizeOfRA-PreamblesGroupA Number of preambles assigned to group A (n4, n8,n12, n16 ,n20, n24, n28, n32, n36, n40, n44, n48,n52, n56 or n60)

messagePowerOffsetGroupB Part of the power equation to identify which groupto use (minusinfinity, dB0, dB5, dB8, dB10, dB12,dB15, or dB18)

messageSizeGroupA Part of the size equation to identify which group touse (b56, b144, b208, b256},

ra-PreambleIndex The preamble to use as parted of dedicatedconfiguration (0 to 63)

ra-PRACH-MaskIndex The resource to use as parted of dedicatedconfiguration (0 to 15)

Random Access Response Window


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MAC Random Access Response


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Uplink Transmission


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MAC Contention Resolution


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Uplink Power Control


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Power Control Calculations


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l

PUSCH Power Control:

l PUCCH Power Control:

l PRACH Power Control:

PPRACH =min{ , PREAMBLE_RECEIVED_TARGET_POWER +PL}dBm

Page208

)}()()()())((log10,min{)( TFO_PUSCHPUSCH10CMAXPUSCH i f i PL j j P i M P i P ++++=

( ) ( ) ( ) ( ){ }i g F nnh PL P P i P HARQCQI ++++= F_PUCCH0_PUCCHCMAXPUCCH ,,min

CMAX P

Contents


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2.21 HARQ Operation


Paging Issues


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DRX Reception of Paging


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Paging FrameFDD Subframe Patterns


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Ns PO wheni_s=0

PO wheni_s=1

PO wheni_s=2

PO wheni_s=3

1 9 N/A N/A N/A2 4 9 N/A N/A

4 0 4 5 9


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Contents


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2.21 HARQ Operation


ARQ vs. HARQ


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HARQ Parallel Processes


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HARQ in LTEFDD HARQ Processes


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HARQ in LTE TDD HARQ Processes


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TDD UL/DL Configuration Maximum Number of HARQ Processes

0 4

1 7

2 103 9

4 12

5 15


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HARQ in the Uplinkl


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l

Synchronous HARQ.l Maximum number of retransmissions configured per UE (as

opposed to per Radio Bearer).

l Downlink ACK/NAKs in response to uplink (re)transmissions are

sent on PHICH.

Uplink HARQ Operation


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HARQfeedback seenby the UE

PDCCH seen bythe UE

UE behaviour

ACK or NACK New Transmission New transmission according to PDCCH

ACK or NACK Retransmission Retransmission according to PDCCH

(adaptive retransmission)

ACK None No (re)transmission, keep data in HARQbuffer and a PDCCH is required to resume

retransmissions

NACK None Non-adaptive retransmission

Contents


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2.21 HARQ Operation



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Transmission Modesl Mode 1 - Single-Antenna transmission, port 0, no MIMO.


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l Mode 2 - Transmit diversity.

l Mode 3 - Transmit diversity or with Large Delays CDD is used.

l Mode 4 - Transmit diversity or Closed-loop spatial multiplexing.

l Mode 5 - Transmit diversity or multi user MIMO (more than one

UE is assigned to the same resource block).

l Mode 6 - Transmit diversity or closed loop precoding for

rank=1 (i.e. no spatial multiplexing, but precoding is used).l Mode 7 - Single-antenna port, port 5 (beamforming).

Spatial Multiplexing MIMO


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Spatial Multiplexing InterferenceIssues


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MIMO Single Stream


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Spatial Multiplexing in LTEPDSCH Processing


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AntennaPortsCodewords

Scrambling

Scrambling

ModulationMapper

ModulationMapper

ResourceElementMapper

ResourceElementMapper

OFDMSignal

Generation

OFDMSignal

Generation

Codebook Based Precoding


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Codebook Index Number of Layers

1 2

0

1

1

2

1

10

01

2

1

111

21 11

1121

2

j

1

2

1 j j11

21

3

j

1

2

1

-

Feedback Reporting


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4bit CQI TableCQI Index Modulation Code Rate x 1024 Efficiency

0 out of range


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1 QPSK 78 0.1523

2 QPSK 120 0.2344

3 QPSK 193 0.3770

4 QPSK 308 0.6016

5 QPSK 449 0.8770

6 QPSK 602 1.1758

7 16QAM 378 1.4766

8 16QAM 490 1.9141

9 16QAM 616 2.4063

10 64QAM 466 2.7305

11 64QAM 567 3.3223

12 64QAM 666 3.9023

13 64QAM 772 4.5234

14 64QAM 873 5.1152

15 64QAM 948 5.5547

Questionsl


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Which protocol performs air interface ciphering and integrity?a. PDCP.

b.RLC.

c. MAC.

d.PHY.

Questionsl


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True / False. All System Information messages are transferredon the BCH.

Questionsl


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How many symbols are there in a slot when a normal CP isused?

a. 5.

b. 6.

c. 7.

d.8.


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Questionsl How many symbols are in a slot when operating with a normal


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CP?

a. 6

b. 7

c. 8

d.9

Questionsl How many physical cell identities are there?


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a. 168

b. 256

c. 504

d.512

Questionsl How many REG make up a CCE?


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a. 6

b. 7

c. 8

d.9

Questionsl Which DCI Format is used to allocate uplink resources?


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a. DCI Format 0

b.DCI Format 1

c. DCI Format 1a

d.DCI Format 1b

Questionsl What is the TTI for the MIB?


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a. 1ms

b.10ms

c. 40ms

d.80ms

Questionsl How many PRACH sequences are on each cell?


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a. 64

b. 128

c. 256

d.512

Questionsl How many HARQ processes are used in the downlink?


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a. 4

b. 6

c. 8

d.10


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Thank youwww.huawei.com
http://www.huawei.com/http://www.huawei.com/

1- OEA000100 LTE Air Interface ISSUE 1.03.pdf

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