3gpp physical layer

7/25/2019 3gpp Physical Layer

1/35

NOKIA File name / 1 / Date / Initials

Introduction to 3GPP Physical LayerIntroduction to 3GPP Physical Layer

By

Barry Cardiff

UK L1 Integration


2/35


AgendaAgenda

Main item: Basic concepts of CMA!

fo""o#ed $y:

%&'' (CMA parameters )er*ices pro*ided $y p+ysica" "ayer , )pectr-m Usage o#n"in. )preading and Mod-"ation Up"in. )preading and Mod-"ation O/), codes , '+ysica" c+anne"s 0a"" of t+em L1 proced-res 2ransport c+anne"s

)tr-ct-re of %&'' 0L1 (+ere to find more 3 4 A


3/35


3GPP WCDMA parameters3GPP WCDMA parameters

C+ip rate 5 %678mcps 0+ence t+e term 9#ide$and6 )preading factors from 8 to ;1< are s-pported6A common pi"ot c+anne" e=ists for c+anne" estimation6 C+anne"isation codes are O/), codes6 3')K is -sed on t+e do#n "in. for eac+ p+ysica" c+anne"6 >')K is -sed on t+e -p"in.6

Circ-it and pac.et s#itc+ed c+anne"s are a*ai"a$"e6

ata is spread t#ice? first $y c+anne"isation codes? t+en $y pse-dorandom scram$"ing codes to differentiate $et#een $asestations on t+edo#n"in.? 0and $et#een mo$i"es on t+e -p"in.6

Open "oop and feed$ac. 2= di*ersity is emp"oyed6 )oft+ando*er #it+ -p to % $asestations is permitted6

,"e=i$"e design so t+at t+ere is no fi=ed #ay to map a ser*ice onto t+ep+ysica" "ayer? t+e mapping is informed at ca"" set-p? and can *arydynamica""y or $e reconfig-red d-ring a ca""6

,ast po#er contro" commands: 1;@@>6


4/35


Cellular stack modelCellular stack model

Physical channels

C C

L C L C

Radio Resource

Assignment[Code, Frequency,

TS, TF Set, Mapping,

etc.]

Measurement Report

RC retransmissioncontrol

L 1 L 1

! T R A " ! #

Control

M

easu

rem

ents

Control

Control

M

easurem

ents

M A C M A C

Control

Transport channels


5/35NOKIA File name / 5 / Date / Initials

Services provided y physical layerServices provided y physical layer

$ So%t hando&er e'ecution

$ #rror detection on transport channels and indication to higher layers

$ F#C encoding(decoding o% transport channels

$ Multiple'ing o% transport channels and demultiple'ing o% )coded composite transport channels*

$ Rate matching +data multiple'ed on C-

$ Mapping o% coded composite transport channels on physical channels

$ Po/er /eighting and com0ining o% physical channels

$ Modulation and spreading(demodulation and despreading o% physical channels

$ Frequency and time +chip, 0it, slot, %rame synchronisation

$ Radio characteristics measurements including F#R, S1R, 1nter%erence Po/er, etc., and

indication to higher layers

$ 1nner loop po/er control

$ RF processing



3GPP WCDMA Physical layer has t!o modes3GPP WCDMA Physical layer has t!o modes

,

p+ysica" c+anne"s are defined $y t#oparameters:

radio fre-ency c+anne" n-m$er a c+anne"isation 9code

)-ita$"e for fast mo$i"e -se

Up"in. and do#n"in. are separated int+e fre-ency domain6

o#n"in. +as more capacity t+an-p"in.

1@@D d-ty cyc"e on $ot+ -p"in. anddo#n"in.

2

p+ysica" c+anne"s are defined $yt+ree parameters:

radio fre-ency c+anne" n-m$er a c+anne"isation 9code time s"ots

)-ita$"e for indoor or s"o# mo*ingmo$i"e -se

Up"in. and are on same fre-ency6

Up"in. and o#n"in. +a*e simi"arcapacity6

Emp"oys 2= on $ot+ -p"in. anddo#n"in.

(+i"st t+ere are maFor differences in t+e p+ysica" "ayer? t+e +ig+er "ayer interface0transport c+anne"s is t+e same for $ot+ sc+emes

"he rest o# this presentation is $DD only



$DD Spectrum %sage$DD Spectrum %sage

2 M-3 +typical.

456745575847Frequency +M-3.

587M-3 +de%ault.!P in9 ,o/n in9

58:7

Carrier %requencies are on 4779-3 0oundries

UTRA Absolute Radio Frequency Channel Number

!plin9 "u ;2 .> M-3

/here Fuplin9 is the uplin9 %requency in M-3

,o/nlin9 "d ; 2 < +Fdo/nlin9 M-3 7.7 M-3 Fuplin9 =46>.> M-3

/here Fdo/nlin9 is the do/nlin9 %requency in M-3



Do!nlink Spreading and ModulationDo!nlink Spreading and Modulation

1

S

P

Cch,SF,m

Sdl,n

@

1?@

B5

B4

BP

BS

S$SC-

P$SC-

ImG)H

eG)H

cos0t

sin0t

)p"it

rea" 4imag6parts

'-"ses+aping

'-"se

s+aping



%plink Spreading and Modulation%plink Spreading and Modulation&dedicated channels'&dedicated channels'

I

cd?1 d

)"ong?nor )s+ort?n

IJF3

'C>1

3

cd?% d

'C>%

cd?; d

'C>;

cd?< d

'C>K

cc c

'CC>


10/35NOKIA File name / 10 / Date / Initi als

A (uick aside on )*S$ codes &+,-'A (uick aside on )*S$ codes &+,-'

Ort+ogona" /aria$"e )preading ,actor 0O/), codes &enerated from a sing"e $ase matri= as fo""o#s:

1 11 1

1 11 1

1 11 1

1 11 1

1 11 1

1 1 1 11 1 1 11 1 1 11 1 1 1

1 1 1 11 1 1 11 1 1 11 1 1 1

1 1 1 11 1 1 11 1 1 11 1 1 1

1 1 1 11 1 1 11 1 1 11 1 1 1

< codes? #it+ ), 5 'aging Indication C+anne" 0'IC>

'+ysica" andom Access C+anne" 0'AC>Ac.no#"edge Indication C+anne" 0AIC> edicated C+anne" 0C>: contains 'CC> 0L1 ctr"

and 'C>0data fie"ds6


13/35NOKIA File name / 13 / Date / Initi als

Physical channels 1 &primary' CPIC2Physical channels 1 &primary' CPIC2

O/), code @ $roadcast o*er entire ce"" Used for c+anne" estimation Can $e -sed for open "oop 2= di*ersity 0antenna < option

Pre$de%ined sym0ol sequence

Slot D7 Slot D5 Slot Di Slot D5C

Tslot; 42>7 chips , 47 0its ; 57 sym0ols

5 radio %rameE T%; 57 ms

slot D5

FrameDi5FrameDi

slot D5

$A $A $A $A $A $A $A $A $A $A $A $A $Antenna 4

ntenna 5

slot D7

Frame oundary


14/35

NOKIA File name / 14 / Date / Initi als

Physical channels 1 SC2Physical channels 1 SC2

Contains t#o parts 0neit+er -se t+e ce"" scram$"ing code primary )C>? same for e*ery ce""

secondary )C>? indicates #+ic+ of t+e 8 code gro-ps t+eprimary scram$"ing code of t+at ce"" $e"ongs to6 Broadcast o*er entire ce"" Used to ac-ire initia" sync+roniation to a ce""

'rimary

)C>

)econdary)C>


15/35


Physical channels 1 P1CCPC2Physical channels 1 P1CCPC2

Broadcast o*er entire ce"" 05 'C'IC> as p+ase reference O/), code 1

2+e 92=off space is ta.en -p $y t+e )C> c+anne" Contains t+e BC> transport data ,i=ed spreading factor 05


16/35


Physical channels 1 S1CCPC2Physical channels 1 S1CCPC2

Carries $ot+ 'C> and ,AC> transport $"oc.s Broadcast o*er eit+er t+e entire O part of a ce"" If a radio frame contains a 'C> t+en t+at frame is $roadcast o*er

entire ce""

,"e=i$"e coding and p+ysica" c+anne" mapping 017P< possi$i"ities 2,CI and B"ind ate detection possi$"e Can $e on any code

Slot D7 Slot D5 Slot Di Slot D5

Tslot; 42>7 chips, 47

Pilot

"pilot0itsata

"data0its

5 radio %rameE T%; 57 ms

TFC1

"TFC10its


17/35


Physical channels 1 PIC2Physical channels 1 PIC2

Associated #it+ a )CC'C> Broadcast o*er t+e entire ce"" Informs mo$i"es L1 if t+ere is a paging message for any mo$i"e in

t+e same gro-p? so t+at it can t+en ecei*e t+e 'C> frame of t+eassociated )CC'C>

'o#er sa*ing in id"e mode Can $e on any code

$1$@

frame

'IC> frame containing paging indicator


18/35


Physical channels 1 P.AC2 &+,-'Physical channels 1 P.AC2 &+,-'

Message partPream0le

78> chips57 ms +one radio %rame

Pream0le Pream0le

Message partPream0le

78> chips 47 ms +t/o radio %rames

Pream0le Pream0le

'ream$"e part:

'ream$"e is a signat-re of "engt+ 01P


19/35


ccc

cd d

Sc$msg,n

1?@

@

1

Physical channels 1 P.AC2 &-,-'Physical channels 1 P.AC2 &-,-'

Pilot

"pilot0its

ata

"data0its


Tslot; 42>7 chips, 57 transport $"oc.s

,"e=i$"e coding Uses same scram$"ing code as pream$"e part Open Loop 'o#er contro"


20/35


Physical channels 1 AIC2Physical channels 1 AIC2

Message part:

Used to carry L1 ac.no#"edgments to 'AC> pream$"es 2+ree *a"-ed 0positi*e? negati*e ac.? or F-st not t+ere

Comprises a signat-re t+at maps e=act"y to t+e signat-re -sed fort+e 'AC> pream$"e $eing ac.no#"edged Broadcast o*er entire ce""

AS +4 AS 5 AS + AS i AS +4 AS 5

a+ a-a5 a3+ a3-a35 a33 a36 a37

AI part Un-sed part


21/35


Physical channels 1 DC2 &+,3'Physical channels 1 DC2 &+,3'

Gne radio %rame, T%; 57 ms

TPC

"TPC0its


Tslot; 42>7 chips, 57


22/35


Physical channels 1 DC2 &-,3'Physical channels 1 DC2 &-,3'DPDC28its,Slot

DPCC28its,Slot

Slot$ormat

i

Channel8it .ate&kps'

ChannelSymol

.ate&ksps'

S$ 8its,Slot

9Data+ 9Data- 9"PC 9"$CI 9Pilot

"ransmslots

radio #9"

@ 1; 6; ;1< 1@ @ 8 < @ 8 1;

@A 1; 6; ;1< 1@ @ 8 < @ 8 71

@B %@ 1;


23/35


Physical channels 1 DC2 &3,3'Physical channels 1 DC2 &3,3'

ata4ata5


24/35


L+ proceduresL+ procedures

Items co*ered +ere

Initia" sync+ronisation AC> transmission C> sync+ronisation Compressed mode

Ot+er items

'ac.et transfer po#er contro" o-tofsync detection

neig+$o-r meas-rements etc666

I i i l S h i i


25/35


Initial SynchronisationInitial Synchronisation

'roced-re:

A&C fast A,C ')C> searc+ 0Matc+ed fi"ter ,rame sync+ronisation and codegro-p identification 0))C> )cram$"ingcode identification

ecoding of 'CC'C>

P.AC2 P dP.AC2 P d


26/35


P.AC2 ProcedureP.AC2 Procedure

'roced-re:

Mo$i"e se"ects 'ream$"e timing and signat-res from a""o#edpossi$i"ities in a random fas+ion6

Loo.s for a L1 ac.no#"edge on AIC> c+anne" (+enRif it gets a positi*e ac. it t+en sends t+e message part Ot+er#ise it ramps t+e po#er -p -nti" it s-cceeds or timeso-t6

asestation

detects pream0le

A1C-

Mo0ile*s

T'

78> chips

P7P5

Prach Pream0le Control part

,ata part

57 or 47 ms

Message Part

Mo0ile*s

R'

DC2 S h i ti P d &+,-'DC2 S h i ti P d &+,-'


27/35


DC2 Synchronisation Procedure &+,-'DC2 Synchronisation Procedure &+,-'

)tart do#n"in.sync+ronisation process

Esta$"is+ c+ip and framesync+ronisation and report

stat-s to +ig+er "ayers

)tart transmission of-p"in. c+anne"s

)tart transmission ofdo#n"in. c+anne"s

)tart -p"in.

sync+ronisation process

Esta$"is+ c+ip and framesync+ronisation and report

stat-s to +ig+er "ayers

UE U2BAN

DC2 S h i ti P d &-,-'DC2 S h i ti P d &-,-'


28/35


DC2 Synchronisation Procedure &-,-'DC2 Synchronisation Procedure &-,-'

"C

frame boundary"8"k; - +5 ms

P1CCPC2

$AC2 on S1CCPC2

"n; -


29/35


Compressed ModeCompressed Mode

Gne %rame

+57 ms Transmission gap a&aila0le %orinter$%requency measurements

Used to create a 9gap in C> c+anne" d-ring #+ic+ time t+e mo$i"ecan meas-re o*er fre-encies? 2? or ot+er systems 0e6g6 &)M

Can $e in eit+er or $ot+ -p"in. and don#"in.

Can $e done -sing ),R< or p-nct-ring met+ods Ca-ses pro$"ems at edge of ce"" operators +ate t+is6

"ransport channels &+,4'"ransport channels &+,4'


30/35


"ransport channels &+,4'"ransport channels &+,4'

BC> carries system #ide information

,AC> do#n"in. common signa"ing c+anne" AC> -p"in. common signa"ing c+anne" 'C> paging c+anne" C> dedicated c+anne" 0can $e -sed for pac.et a"so C'C> Common -p"in. pac.et c+anne" 0o-t of QQ

)C> o#n"in. s+ared c+anne" 0pac.et

BC> is t+e on"y one #it+ a fi=ed coding sc+eme? a"" ot+ers are tota""y

f"e=i$"e6

"ransport channels &-,4'"ransport channels &-,4'


31/35


"ransport channels &-,4'p & 'mapping to physical channelsmapping to physical channels

Transport Channels

C-

RAC-

CPC-

C-

FAC-

PC-

SC-

Physical Channels

edicated Physical ata Channel +PC-

edicated Physical Control Channel +PCC-

Physical Random Access Channel +PRAC-

Physical Common Pac9et Channel +PCPC-

Common Pilot Channel +CP1C-

Primary Common Control Physical Channel +P$CCPC-

Secondary Common Control Physical Channel +S$CCPC-

Synchronisation Channel +SC-

Physical o/nlin9 Shared Channel +PSC-Acquisition 1ndication Channel +A1C-

Page 1ndication Channel +P1C-

"ransport channels &3,4'"ransport channels &3,4'


32/35


p & 'p & 'Generic coding 1 do!nlinkGeneric coding 1 do!nlink

TrCH Multiplexing

CRC attachment

Rate matchingRate

matching

1stinsertion of DTX

indication

1st interleaving

Radio frame segmentation

2ndinsertion of DTX

indication

2ndinterleaving

Physical channel

segmentation

Physical channel mapping

TrBk concatenation /

Code block segmentation

Channel coding

"ransport channels &4,4'"ransport channels &4,4'


33/35


p & 'p & 'Generic coding 1 uplinkGeneric coding 1 uplink

Rate

matching

Physical channel

segmentation

Radio frame segmentation

2nd

interleaving

Physical channel mapping

Channel coding

Rate matching

TrBk concatenation /

Code block segmentation

CRC attachment

Radio frame equalisation

1stinterleaving

TrCH Multiplexing

Structure o# 3GPP &L+'Structure o# 3GPP &L+'


34/35


Structure o# 3GPP &L+'Structure o# 3GPP &L+'

AN

AN (& 1 AN (& 8

,-nctiona" )pecification


35/35


Where to #ind more @Where to #ind more @

One '"ace:

httpE((cst.ntc.no9ia.com(ess&(stand(ataase(Specs(de%ault.htm

A"" %&'' 4 E2)I specification can $e fo-nd +ere

Can searc+ $y n-m$er? name of .ey#ord

3gpp physical layer

Documents