31788711 WCDMA Physical Layer Design

8/13/2019 31788711 WCDMA Physical Layer Design

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A. Chockalingam

Assistant Professor

Indian Institute of Science, Bangalore-12

[email protected]

http://ece.iisc.ernet.in/~achockal


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2

Outline

WCDMA Network ArchitectureWCDMA Network Architecture

WCDMA Physical LayerWCDMA Physical Layer

Physical / Transport / Logical ChannelsPhysical / Transport / Logical Channels

UplinkUplink

!prea"ing # Channelisation / !cra$%ling!prea"ing # Channelisation / !cra$%ling

Transport &or$ats an" Con'igurationTransport &or$ats an" Con'iguration

Multiple(ing an" Channel Co"ingMultiple(ing an" Channel Co"ing

DownlinkDownlink

!prea"ing / !cra$%ling / Channelisation!prea"ing / !cra$%ling / Channelisation

Multiple(ing an" Channel Co"ingMultiple(ing an" Channel Co"ing


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)

2G to G !"olution

*!#+,A*!#+,A *!#+,-*!#+,- c"$a2...c"$a2...

*MT2...*MT2...

*MT2... *TU0s !tan"ar"i1ation ''ort towar"s )3*MT2... *TU0s !tan"ar"i1ation ''ort towar"s )3

4*MT#2... pre5iously ter$e" as &PLMT!6

UMT!UMT!uropean ''ort 4!peci'ie" %y )3 Partnership Pro7ect )3PP6

3!M3!M 3P8!3P8!

WCDMAWCDMA

D3D3

DD

AA

TT

AA

**

!!

++

++


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9

#$%S &' $odel

U!*MMo%ile

:uip$ent

Access

Network

!er5ing

Network

P!/C!

Transit

Network

CuCu UuUu *u*u ;u;u

User :uip$entUser :uip$ent Access NetworkAccess Network Core NetworkCore Network

*n'rastructure*n'rastructure


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,

#$%S &' Architecture

No"e -

U

U

U

No"e -

No"e -

No"e -

8NC

8NC

UT8AN

8N!

8N!

CN

CN 4C! Do$ain6

CN 4P! Do$ain6

!3!N 33!N

8egisters


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?

'C($A S)stem *eatures

UT8A &DD $o"e an" TDD $o"eUT8A &DD $o"e an" TDD $o"e UT8A &DD 'eaturesUT8A &DD 'eatures

Multiple AccessMultiple Access CDMACDMA

Channel !pacingChannel !pacing , M


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#%+A *(( *eatures

&C Co"es&C Co"es 8ate B/2E B/) con5olutional co"e8ate B/2E B/) con5olutional co"ewith constraint length F G +with constraint length F G +

8ate B/)E #state Tur%o co"ing8ate B/)E #state Tur%o co"ing

*nterlea5ing*nterlea5ing *ntra# or *nter#'ra$e interlea5ing*ntra# or *nter#'ra$e interlea5ing

4B.E 2. 9.E . $sec64B.E 2. 9.E . $sec6 Mo"ulationMo"ulation HP!FHP!F

DetectionDetection Coherent %ase" on pilot sy$%olsCoherent %ase" on pilot sy$%ols

Micro "i5ersityMicro "i5ersity 8AF in -! an" U8AF in -! an" U

Power ControlPower Control &ast close"#loop at B,..


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+adio Interface Protocol $odel

P


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+

'C($A +adio Channels

Physical ChannelsPhysical Channels Trans$ission $e"ia@Trans$ission $e"ia@

Two types o' physical channels "e'ine" in LBI &DD an" TDD@Two types o' physical channels "e'ine" in LBI &DD an" TDD@

&DD is characteri1e" %y 're:uencyE co"eE */H phase&DD is characteri1e" %y 're:uencyE co"eE */H phase

&ollow a layere" structure o' Jra"io 'ra$esK an" Jti$e slotsK&ollow a layere" structure o' Jra"io 'ra$esK an" Jti$e slotsK

Transport ChannelsTransport Channels "escri%es the way in'or$ation is trans'erre" o5er the ra"io inter'ace"escri%es the way in'or$ation is trans'erre" o5er the ra"io inter'ace

Logical ChannelsLogical Channels the type o' in'or$ation trans'erre" characteri1es a logical channelthe type o' in'or$ation trans'erre" characteri1es a logical channel

U -! 8NC

Logical ChannelsLogical Channels

Transport ChannelsTransport Channels

Physical ChannelsPhysical Channels


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B.

Ph)sical Channels

Correspon"s to a speci'ic carrier 're:uencyECorrespon"s to a speci'ic carrier 're:uencyE

co"eE relati5e phase in * an" H %ranchesco"eE relati5e phase in * an" H %ranches

De"icate" an" Co$$on Physical ChannelsDe"icate" an" Co$$on Physical Channels

Layere" structure o' ra"io 'ra$es an" ti$e slotsLayere" structure o' ra"io 'ra$es an" ti$e slots A ra"io 'ra$e G B. $sec G B, slots/'ra$eA ra"io 'ra$e G B. $sec G B, slots/'ra$e

B 'ra$e G )9.. chipsE B slot G 2,?. chipsB 'ra$e G )9.. chipsE B slot G 2,?. chips

!lot con'iguration 5aries "epen"ing on the!lot con'iguration 5aries "epen"ing on thechannel %it rate o' the physical channelchannel %it rate o' the physical channel

%its/slot "i''erent 'or "i''erent physical channels %its/slot "i''erent 'or "i''erent physical channels

$ay 5ary with ti$e 4on a 'ra$e %y 'ra$e %asis6$ay 5ary with ti$e 4on a 'ra$e %y 'ra$e %asis6


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BB

# Ph)sical Channels

De"icate" U/L ChannelsDe"icate" U/L Channels DPDC


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B2

(edicated # Ph)sical Channels

Two typesTwo types

De"icate" Physical Data C


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B)

# *rame Structure

There is only one U/L DPCC< on each ra"io linkThere is only one U/L DPCC< on each ra"io link There can %e .E BE or se5eral DPDC


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B9

I, S/reading for (P(C0, (PCC0

DPDC


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B,

'C($A %ransmission +ates #

!yste$ Chip 8ate )@9 Mcps!yste$ Chip 8ate )@9 Mcps

!y$%ol 8ates on Uplink!y$%ol 8ates on Uplink

Chl !y$% 8ateChl !y$% 8ate Chl -it 8ateChl -it 8ate !& -its/'ra$e N!& -its/'ra$e N"ata"ata

B, Fs/sB, Fs/s B, F%/s 2,? B, F%/s 2,? B,. B,. B. B. ). Fs/s). Fs/s ). F%/s B2 ). F%/s B2 ).. 2. ).. 2.

?. Fs/s ?. F%/s?. Fs/s ?. F%/s ?9 ?.. 9. ?9 ?.. 9.

B2. Fs/s B2. F%/sB2. Fs/s B2. F%/s )2 B2.. .)2 B2.. .

29. Fs/s 29. F%/s29. Fs/s 29. F%/s B? 29.. B?.B? 29.. B?.

9. Fs/s 9. F%/s9. Fs/s 9. F%/s 9.. )2. 9.. )2.

+?. Fs/s +?. F%/s 9 +?.. ?9.+?. Fs/s +?. F%/s 9 +?.. ?9.


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B?

'C($A Channelisation Codes

rthogonal co"esrthogonal co"es

Use" 'or channel separation %oth in U/L an" D/LUse" 'or channel separation %oth in U/L an" D/L

"irections"irections

Can ha5e "i''erent sprea"ing 'actor 5alues 4thusCan ha5e "i''erent sprea"ing 'actor 5alues 4thus

support "i''erent sy$%ol rates6support "i''erent sy$%ol rates6

CCchE!&EkchE!&Ek !& # !prea"ing &actorE k is the co"e !& # !prea"ing &actorE k is the co"e

nu$%er .OGkOG !Bnu$%er .OGkOG !B !prea"ing 'actor 5alue in"icates how $any %its o'!prea"ing 'actor 5alue in"icates how $any %its o'

those co"es are use" in a connectionthose co"es are use" in a connection


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B

# Channeli3ation Codes

rthogonal >aria%le !prea"ing &actor 4>!&6rthogonal >aria%le !prea"ing &actor 4>!&6

channeli1ation co"eschanneli1ation co"es

!eparates "ata / control channels 'ro$ sa$e U!eparates "ata / control channels 'ro$ sa$e U

Preser5es orthogonality %etween these channelsPreser5es orthogonality %etween these channels

4B64B6

4BEB64BEB6

4BE#B64BE#B6

4BEBEBEB64BEBEBEB6

4BEBE#BE#B64BEBE#BE#B6

4BE#BEBE#B64BE#BEBE#B6

4BE#BE#BEB64BE#BE#BEB6

!&GB!&GB!&G2!&G2

!&G9!&G9

C4!&Ek6C4!&Ek6

!& !prea"ing &actor!& !prea"ing &actor

k co"e nu$%er .OkOG!Bk co"e nu$%er .OkOG!B


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B

# Scram4ling Codes

Use co$ple( 5alue" scra$%ling co"eUse co$ple( 5alue" scra$%ling co"e Long scra$%ling se:uences 42296Long scra$%ling se:uences 42296

3ol" se:uences 4linear co$%ination o' two $#se:uences63ol" se:uences 4linear co$%ination o' two $#se:uences6

!hort scra$%ling se:uences 42296!hort scra$%ling se:uences 42296 'ro$ a 'a$ily se:uence o' perio"ically e(ten"e" !426'ro$ a 'a$ily se:uence o' perio"ically e(ten"e" !426

co"esco"es

Long or short se:uences 'or DPCC< / DPDC


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B+

'C($A Code %)/es

!cra$%ling Co"esE Channelisation Co"es!cra$%ling Co"esE Channelisation Co"es

UplinkUplink DownlinkDownlink

!cra$%ling co"es!cra$%ling co"es User separationUser separation Cell separationCell separation

ChannelisationChannelisation Data an" ControlData an" Control Users within aUsers within aco"esco"es channels 'ro$ thechannels 'ro$ the cell cell

sa$e ter$inalsa$e ter$inal

!prea"ing co"e G !cra$%ling co"e ( Channelisation co"e!prea"ing co"e G !cra$%ling co"e ( Channelisation co"e


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2.

Common # Ph)sical Channels

Two TypesTwo Types Physical 8an"o$ Access C


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2B

+andom Access

UU -!-!

P8AC


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22

Common # Ph)sical Channels

Physical Co$$on Packet C


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2)

%rans/ort *ormats Configurations

Transport -lockTransport -lock 4T-64T-6 -asic unit o' "ata e(change" %etween LB Q MAC 'or LB-asic unit o' "ata e(change" %etween LB Q MAC 'or LB

processingprocessing

Transport -lock !i1eTransport -lock !i1e Nu$%er o' %its in a T-@Nu$%er o' %its in a T-@

Transport -lock !etTransport -lock !et 4T-!64T-!6A set o' T-s e(change" %etween LB an" MAC at the sa$eA set o' T-s e(change" %etween LB an" MAC at the sa$e

ti$e instant using the sa$e transport channelti$e instant using the sa$e transport channel

Transport -lock !et !i1eTransport -lock !et !i1eNu$%er o' %its in a T-!Nu$%er o' %its in a T-!

Trans$ission Ti$e *nter5alTrans$ission Ti$e *nter5al 4TT*64TT*6 Perio"icity at which a T-! is trans'erre" %y the physicalPerio"icity at which a T-! is trans'erre" %y the physical

layer on to the ra"io inter'ace # RB.E 2.E 9.E . $sSlayer on to the ra"io inter'ace # RB.E 2.E 9.E . $sS

MAC "eli5ers one T-! to the physical layer e5ery TT*MAC "eli5ers one T-! to the physical layer e5ery TT*


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Transport &or$atTransport &or$at 4T&64T&6 &or$at o''ere" %y LB to MAC 4an" 5ice 5ersa6 'or the "eli5ery o' a&or$at o''ere" %y LB to MAC 4an" 5ice 5ersa6 'or the "eli5ery o' a T-! "uring a TT* on a gi5en transport channel 4TrCaria%le %it rate can %e achie5e" %y changing 4>aria%le %it rate can %e achie5e" %y changing 4%etween TT*s%etween TT*s66either the T-! si1e onlyE or %oth the T- si1e an" T-! !i1eeither the T-! si1e onlyE or %oth the T- si1e an" T-! !i1e

Transport &or$at !etTransport &or$at !et 4T&!64T&!6 a set o' T&s associate" with a TrC


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2,


Transport &or$at Co$%inationTransport &or$at Co$%ination

4T&C64T&C6

Multiple TrC


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2?


TT*TT* TT*TT* TT*TT*

TT*TT* TT*TT* TT*TT*

T-T-DC


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2

%*I and %*CI %ransmitter

Transport Chl BTransport Chl B Transport Chl 2Transport Chl 2

TransportTransport

-lock-lockTransportTransport

-lock-lock

TransportTransport-lock-lock

TransportTransport-lock-lock

T&*T&* T&*T&*

T&C*T&C* Co"ing an"Co"ing an"Multiple(ingMultiple(ing

PhysicalPhysical

LayerLayer


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2

%*I and %*CI +ecei"er

Transport Chl BTransport Chl B Transport Chl 2Transport Chl 2

TransportTransport

-lock Q *-lock Q *TransportTransport

-lock Q *-lock Q *

TransportTransport-lock Q *-lock Q *

TransportTransport-lock Q *-lock Q *

T&*T&* T&*T&*

T&C*T&C*Deco"eDeco"e

Deco"ing an"Deco"ing an"De$ultiple(ingDe$ultiple(ing

PhysicalPhysical

LayerLayer


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2+

%*I and %*CI

ach transport channel is acco$panie" %y aach transport channel is acco$panie" %y a T&*T&*at eachat eachti$e e5ent at which "ata is e(pecte" to arri5e 'ro$


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).

%rans/ort *ormat e.g., S/eech

Con5ersational !peech 4B2 F%ps6Con5ersational !peech 4B2 F%ps6

B2@2 F%ps $a(@B2@2 F%ps $a(@

TT* 2. $secTT* 2. $sec

Transport &or$ats 4T&6 a5aila%leTransport &or$ats 4T&6 a5aila%le

T& 8A-B 8A-2 8A-)T& 8A-B 8A-2 8A-)

T&.5 . ( B . ( B.) . ( ?. 4e@g@E silence6T&.5 . ( B . ( B.) . ( ?. 4e@g@E silence6

T&B5 B ( B B ( B.) B ( ?. 4e@gE acti5e 5oice6T&B5 B ( B B ( B.) B ( ?. 4e@gE acti5e 5oice6

two other 'or$ats too 4see !t"s@ Doc@6two other 'or$ats too 4see !t"s@ Doc@6

T&C 4T&.E T&.E T&.6 e@g@E "uring silenceT&C 4T&.E T&.E T&.6 e@g@E "uring silence

4T&BE T&BE T&B6 e@g@E "uring acti5e 5oice perio"s4T&BE T&BE T&B6 e@g@E "uring acti5e 5oice perio"s


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)B

%rans/ort *ormat e.g., (ata

*nteracti5e/-ackgroun" Data 4?9 F%ps6*nteracti5e/-ackgroun" Data 4?9 F%ps6

?9 F%ps $a(@?9 F%ps $a(@

TT* 2. $secTT* 2. $sec

Transport -lock 4T-6 si1e G ))? %itsTransport -lock 4T-6 si1e G ))? %its

Transport &or$ats 4T&6 a5aila%leTransport &or$ats 4T&6 a5aila%le

T&. # . ( ))?T&. # . ( ))?

T&B # B ( ))?T&B # B ( ))?

T&2 # 2 ( ))?T&2 # 2 ( ))?

T&) # ) ( ))?T&) # ) ( ))?

T&9 # 9 ( ))?T&9 # 9 ( ))?


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)2

%rans/ort *ormat S/eech 5 (ata

Con5ersational speech 4B2 F%ps6 Con5ersational speech 4B2 F%ps6 *nteracti5e/-ackgroun" Data 4?9 F%ps6*nteracti5e/-ackgroun" Data 4?9 F%ps6

>oice TrC< Data TrCoice TrC< Data TrCiter%i6 "eco"ing8ecei5er per'or$s &C 4>iter%i6 "eco"ing

path $etric selection a$ong the sur5i5ing paths in the "eco"ingpath $etric selection a$ong the sur5i5ing paths in the "eco"ing


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99

( Ph)sical Channels

De"icate" D/L ChannelsDe"icate" D/L Channels DPDC

!ynchroni1ation C


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9,

(edicated ( Ph)sical Channels

De"icate" Physical C


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9?

( *rame Structure

!.!.

B. $sec 'ra$es "i5i"e" into B, slotsB. $sec 'ra$es "i5i"e" into B, slots

No@ o' %its in "i''erent DPDC< 'iel" 4NpilotE NtpcE Nt'ciE N"ataBENo@ o' %its in "i''erent DPDC< 'iel" 4NpilotE NtpcE Nt'ciE N"ataBE

N"ata26 are gi5en in ta%lesN"ata26 are gi5en in ta%les

Which slot 'or$at to use is con'igure" 4an" recon'igure"6 %yWhich slot 'or$at to use is con'igure" 4an" recon'igure"6 %y

higher layershigher layers

!B!B !2!2 !)!) !B)!B) !B9!B9

B &ra$e G B, slots G B. $secB &ra$e G B, slots G B. $sec

DATA BDATA B

B ti$e slot G 2/) $secB ti$e slot G 2/) $sec

DPDC


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9

( %ransmission

Multico"e Trans$ission on D/LMultico"e Trans$ission on D/L Multico"e trans$ission can %e e$ploye" on the D/LMultico"e trans$ission can %e e$ploye" on the D/L

*@e@E CCTrC< is $appe" on to se5eral parallel D/L*@e@E CCTrC< is $appe" on to se5eral parallel D/L

DPC


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9

'C($A %ransmission +ates (

!yste$ Chip 8ate )@9 Mcps!yste$ Chip 8ate )@9 Mcps

!y$%ol 8ates on Downlink!y$%ol 8ates on Downlink

!y$% 8ate!y$% 8ate Chl %it rateChl %it rate !&!&

@, Fs/s@, Fs/s B, F%/s ,B2 B, F%/s ,B2

B, Fs/sB, Fs/s ). F%/s 2,? ). F%/s 2,?

). Fs/s). Fs/s ?. F%/s B2 ?. F%/s B2

?. Fs/s B2. F%/s ?9?. Fs/s B2. F%/s ?9

B2. Fs/s 29. F%/s )2B2. Fs/s 29. F%/s )2 29. Fs/s 9. F%/s B?29. Fs/s 9. F%/s B?

9. Fs/s +?. F%/s 9. Fs/s +?. F%/s

+?. Fs/s B+2. F%/s 9+?. Fs/s B+2. F%/s 9


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9+

Common ( Ph)sical Channels

Co$$on Pilot C !cra$%le" either %y the pri$ary or a secon"ary scra$%ling co"e!cra$%le" either %y the pri$ary or a secon"ary scra$%ling co"e

A cell $ay contain .EBE or se5eral !#CP*C


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,.


Co$$on Control Physical C


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,B


!ynchroni1ation C


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,2

( S/reading

DL PhysicalDL Physical

Channel "ataChannel "ata CC"E!&E$"E!&E$!erial to!erial to

ParallelParallel

Con5@Con5@

**

HH

*7H*7H

!!"lEn"lEn

77

Channelisation co"e # Di''erentiate users in a cellChannelisation co"e # Di''erentiate users in a cell

# >! >!&

# UT8AN assigns channelisation co"es to "i''@ phy@ chls# UT8AN assigns channelisation co"es to "i''@ phy@ chls

!cra$%ling Co"e Di''erentiate cells!cra$%ling Co"e Di''erentiate cells

S 4li C d


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,)

Scram4ling Codes

possi%le D/L scra$%ling co"es G 2B #B G 2?2B9) possi%le D/L scra$%ling co"es G 2B #B G 2?2B9) !cra$%ling co"es "i5i"e" into ,B2 sets!cra$%ling co"es "i5i"e" into ,B2 sets

B pri$ary scra$%ling co"e an" B, secon"ary scra$%ling co"esB pri$ary scra$%ling co"e an" B, secon"ary scra$%ling co"es

!oE there are ,B2 ( B? G B+2 co"es!oE there are ,B2 ( B? G B+2 co"es

ach cell is allocate" one an" only pri$ary scra$%ling co"each cell is allocate" one an" only pri$ary scra$%ling co"e

The pri$ary CCPC< 4Co$$on Control Physical C


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,9

$ulti/le6ing 7 Channel Coding (

C8C Attach$ent

Tr-k Concatenation/

Co"e -lock !eg$entation

Channel Co"ing

8ate Matching

Bst *nsertion o' DT *n"icationBst *nterlea5ing

8a"io &ra$e !eg$entation

CCTrC


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,,

$ulti/le6ing 7 Channel Coding ..cntd

Physical Channel MappingPhysical Channel Mapping

on U/L PhC


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,?

$ulti/le6ing 7 Channel Coding ..cntd

*nsertion o' Discontinuous Trans$ission 4DT6*nsertion o' Discontinuous Trans$ission 4DT6*n"ication -its*n"ication -its

only on the D/Lonly on the D/L

use" to 'ill up the ra"io 'ra$e with %itsuse" to 'ill up the ra"io 'ra$e with %its

insertion point "epen"s on whetherinsertion point "epen"s on whether 'i(e" positions'i(e" positions 4Bst4Bst

*nsertion6*nsertion6oror 'le(i%le positions'le(i%le positions 42n" *nsertion642n" *nsertion6o' theo' the

TrC


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,

'C($A Ph)sical Channels

P#CCPCDPDC

Ch l $ i th #


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,

Channel $a//ing on the #

CCC< DTC< DCC

31788711 WCDMA Physical Layer Design

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