02_RA41232EN05GLA0_LTE_Channels.pdf

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LTE ChannelsLTE Radio Link and EPS Signaling




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Module 2 Objectives

After completing this module, the participant will be able to:

• List the LTE channels

• Explain the functions of the LTE Logical, Transport, andPhysical Channels

•Describe the mapping of LTE Physical Channels to physicalsubframes




Module Contents

LTE Channel Architecture

Logical Channels

Transport Channels

Physical Channels

Mapping DL Physical Channels to Subframes

Mapping UL Physical Channels to Subframes




Uu Interface Data Link Layer

TCP/IP Suite• Controls UE access to the network

• Encapsulates/fragments user data

• Compresses upper layer headers

• Provides encryption and integrity checks

• Manages Physical Layer scheduling

The Uu Interface Data Link Layer:

MAC

PDCP

RLC

RRC

C o n t r o l

B e a r e r

4 Transport

5 Application

3 Network

2 Data Link

1 Physical




MAC Sublayer

Physical Layer

RRC Sublayer User Data Plane

PDCP Sublayer

RLC Sublayer

MAC Sublayer

Radio Bearers

E-RAB

Signaling Radio Bearers

Logical Channels

Transport Channels

Physical Channels



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MAC Sublayer

Physical Layer


PDCP Sublayer

RLC Sublayer

MAC Sublayer

Radio Bearers

E-RAB

Signaling Radio Bearers

Logical Channels

Transport Channels

Physical Channels




Module Contents


Logical Channels

Transport Channels

Physical Channels





MAC Sublayer


PDCP Sublayer

RLC Sublayer

MAC Sublayer

L

o g i c a l

C h

a n n e l s

Radio

Bearers

Signaling

Radio Bearers

Control

Channels

Traffic

Channels

Logical Channels

R a d i o

B e a r e r s



Logical Channel Types

MAC Sublayer

RLC Sublayer

MAC Sublayer

B

C

C

H

P

C

C

H

M

C

C

H

M

T

C

H

D

T

C

H

D

C

C

H

C

C

C

H L o g i c a l

C h a n

n e l s



Module Contents


Logical Channels

Transport Channels

Physical Channels





MAC Sublayer

Transport Channel Types

Physical Layer

MAC Sublayer

B

CH

R

A

C

H

U

L

-

S

C

H

M

CH

P

CH

D

L

-

S

C

H T r a n s

p o r t

C h a n

n e l s




Logical to Transport Channel Mapping

Physical Layer

MAC Sublayer

RLC Sublayer

MAC Sublayer

R

A

CH

U

L

-

SC

H

M

CH

M

C

C

H

M

T

C

H

D

T

C

H

D

C

C

H

C

C

C

H L o g i c a l

C h a n n e l s

T r a n

s p o r t

C h a

n n e l s

P

CH

P

C

C

H

B

CH

D

L

-

S

C

H

B

C

C

H




Module Contents


Logical Channels Transport Channels

Physical Channels






Physical Layer

DL Physical Channels

P

M

CH

P

B

CH

P

C

F

IC

H

P

D

C

C

H

P

H

I

C

H

P

D

S

C

H

P h y s i c a l

C h

a n n e l s




Physical Layer

UL Physical Channels

P

U

S

C

H

P

U

C

C

H

P

R

A

C

H

P h

y s i c a l

C h a n n e l s




P

H

I

C

H

P

U

C

C

H

P

C

FI

C

H

P

D

C

C

H

Physical Layer

Transport to Physical Channel Mapping

MAC Sublayer

D

L

-

S

C

H

T r a n s p o r t

C h a n n e l s

P h y s

i c a l

C h a n n e l s P

D

S

C

H

P

C

H

B

C

H

P

MC

H

R

A

C

H

P

R

A

C

H

U

L

-

S

C

H

P

U

S

C

H

M

C

H

P

BC

H




Module Contents



Physical Channels






Sl

o

t

1

7

Sl

o

t

1

9

Sl

o

t

1

3

Sl

o

t

1

5

Sl

o

t

1

1

Subframe

0

O c c u p i e d

S u b c a r r i e r s

Sl

o

t

1

6

Sl

o

t

1

8

Sl

o

t

1

2

Sl

o

t

1

4

Sl

o

t

8

Sl

o

t

9

Sl

o

t

1

0

Sl

o

t

6

Sl

o

t

7

Sl

o

t

4

Sl

o

t

5

Sl

o

t

2

Sl

o

t

3

Sl

o

t

0

1 9

Sl

o

t

1

2 3 5 6 7 84

R0

R0

R0

R0

DLResource

Blocks

R0

R0

R0

R0

Even Slot Odd Slot

Not used

on this port

Reference

Signal

PDSCH

Mapping PDSCH to Subframes




Resource Element Group (REG)

Reference

Signal

DL Resource Block

(Single Port Antenna)

Resource

Element

Resource Element

Group (REG)

S=0 S=6




Sl

o

t

1

7

Sl

o

t

1

9

Sl

o

t

1

3

Sl

o

t

1

5

Sl

o

t

1

1

DL Channels and Resource MappingSubframe

0

O c c u p i e d


Sl

o

t

1

6

Sl

o

t

1

8

Sl

o

t

1

2

Sl

o

t

1

4

Sl

o

t

8

Sl

o

t

9

Sl

o

t

1

0

Sl

o

t

6

Sl

o

t

7

Sl

o

t

4

Sl

o

t

5

Sl

o

t

2

Sl

o

t

3

Sl

o

t

0

1 9

Sl

o

t

1

2 3 5 6 7 84

R0

R0

R0

R0

DLResource

Blocks

R0

R0

R0

R0

Even Slot Odd Slot

Not used

on this port

Reference

Signal

PDCCH, PHICH, PCFICHPDSCH




PDCCH Formats

PDCCHFormat

Number of CCEs Number ofREGs

Number ofREs

Number of bitsin PDCCH

0 1 9 36 72

1 2 18 72 144

2 4 36 144 2883 8 72 288 576




PDCCH Scheduling Information

DL Allocation•C-RNTI

•Transport Format•Starting PRB

•Number of PRBs

•MCS Index

UL Grant•C-RNTI

•Transport Format•Starting PRB

•Number of PRBs

•MCS Index

•Transmit Power Cmd




PDCCH MCS Index - Examples

MCS Index IMCS ModulationOrder TB Size Index ITBS

0 QPSK 0

1 QPSK 1

2 QPSK 2

. . .

12 16QAM 11

13 16QAM 12

14 16QAM 13

. . .

23 64QAM 21

24 64QAM 22




PDCCH Transport Block Size Index - Example

ITBS NPRB

1 2 3 4 5 6 7 8 100

0 16 32 56 88 120 152 176 208 2792

1 24 56 88 144 176 208 224 256 3624

. . . . . . . . . .

11 176 376 584 776 1000 1192 1384 1608 19848

12 208 440 680 904 1128 1352 1608 1800 22920

. . . . . . . . .

25 616 1256 1864 2536 3112 3752 4392 5160 63776

26 712 1480 2216 2984 3752 4392 5160 5992 75376




Discontinuous Reception (DRX)

eNodeB




Discontinuous Reception (DRX) cont…

eNodeB




Slot 1

0 1 2 3 4 5 6

Physical Broadcast Channel

Subframe 1 98

f 1

(DL)

0 2 3 4 5 6 7

PBCH

DC

Slot 0

0 1 2 3 4 5 6Symbol

72

Subcarriers

PBCH carries:• DL system bandwidth

• # Tx antenna ports

• RS Tx power, etc.

O c c u p i e d

S

u b c a r r i e r s




System Information Blocks (SIBs)




Module Contents



Physical Channels






Mapping the PUSCH to SubframesSubframe

0

O c c u p i e d


1 92 3 5 6 7 84

U L

R e s o u r c e

B l o c k s

Demodulation RS

PUSCH

Even Slot Odd Slot

RS

Reference

SignalRS




Demodulation RS

PUSCH

PUCCH

Mapping the PUCCH to SubframesSubframe

0

O c c u p i e d


1 92 3 5 6 7 84

U

L R e s o u r c e

B l o c k s

Even Slot Odd Slot

RS

1 2 S C - F D M A


PUCCHRS

RS

RS RS RS




Demodulation RS

PUSCH

Multiple PUCCH in One SubframeSubframe

0

O c c u p i e d


1 92 3 5 6 7 84

U L

R e s o u r c e

B l o c k s

Even Slot Odd Slot

PUCCH 0

PUCCH 1

PUCCH 1

PUCCH 0

PUCCH 3

PUCCH 3

PUCCH

PUCCH 2

PUCCH 2




PUCCH Formats

PUCCHFormat

ModulationScheme

Bits perSubframe

TCP Carries

1 N/A N/A Normal, Extended SR

1a BPSK 1 Normal, Extended SR, ACK/NACK

1b QPSK 2 Normal, Extended SR, ACK/NACK

2 QPSK 20 Extended CQI, ACK/NACK

2a QPSK+BPSK 21 Normal CQI, ACK/NACK

2b QPSK+BPSK 22 Normal CQI, ACK/NACK

R d A P bl




Random Access Preamble

Subframe 1 98

f 2 (UL)

0 2 3 4 5 6 7

CP GPRA Preamble

PRACH Subframe

72 Contiguous

Subcarriers

Size depends on Burst Format

Burst Format

0 – Normal cell

1 – Extended format large cell

2 – Repeated format 30 km cell

3 – Repeated format 100 km cell

U I f S bl O i k h 01




Uu Interface Sublayers Overview – worksheet 01

L S



Lesson Summary

In this lesson, you learned about:

• The LTE channels

• The functions of the LTE Logical, Transport, and PhysicalChannels

• The mapping of LTE Physical Channels to physicalsubframes

Documents

02_RA41232EN05GLA0_LTE_Channels.pdf