02 Wo_bt1003_e01_0 Umts Radio Channel-29

7/23/2019 02 Wo_bt1003_e01_0 Umts Radio Channel-29

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UMTS Radio Channel


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Contents

1 Channels of UTRAN.....................................................................................................................................1

1.1 Logical channels..................................................................................................................................2

1.2 Transport channels...............................................................................................................................3

1.3 Physical channels.................................................................................................................................5

1.3.1 Uplink physical channels..........................................................................................................5

1.3.2 Downlink physical channel....................................................................................................10

1.4 Channel Mapping...............................................................................................................................20

2 Physical layer porcedure............................................................................................................................23

2.1 Cell search proce!re........................................................................................................................23

2.2 "ano# $ccess Proce!re................................................................................................................23

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1 Channels of UTRAN

Channels o% UT"$& are i'ie into

logical channels

transport channels

physical channels

(n air inter%ace protocol #oele o% UT"$&) M$C layer acco#plish the #apping o%

logical channels onto transport channels) P*+ layer acco#plish the #apping o%

transport channels onto physical channels. ,ig!re 1 shows the position o% logical

channels an transport channels


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D!plication $'oiance

-C &t DC

-C &t DC

"LC"LC

"LC"LC

"LC"LC

"LC"LC

.MC

PDCPPDCP

C/plane signalling U/plane in%or#ation U!0 o!nary

control

control

control

control

L3

"aio

.earers

L2PDCP

L2.MC

L2"LC

Logical

Channels

L2M$C

Transport

Channels

L1

control""C

M$C

P*+

,ig!re 1 logical channels an transport channels

1.1 Logical channels

M$C layer i#ple#ent the #apping etween logical channel an transport channel an

pro'ie ata transport ser'ice %or logical. Logical channels are i'ie into control

channel an tra%%ic channel. ,ig ill!strates the str!ct!re o% logical channels


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Chapter 1 Channels o% UT"$&

,ig!re 2 Logical channel str!ct!re

Control channels only !se to transport control plane in%or#ation. (ncl!ing

CC*)PCC*)CCC*)DCC*)*CC*.

Tra%%ic channels only !se to transport !ser plane in%or#ation. (nc!l!ing

DTC*)CTC*.

1.2 Transport channels

Transport channels are ser'ices o%%ere y Layer 1 to the higher layers$ transport

channel is e%ine y how an with what characteristics ata is trans%erre o'er the air

inter%ace. $ general classi%ication o% transport channels is into two gro!ps

Deicate channel !se y eicate !ser.

Co##on channel !se y all !sers within one cell.

how as,ig!re 3

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UMT "aio Channel

,ig!re 3 transport channels

There eists only one type o% eicate transport channel) the Deicate Channel

DC*6. The Deicate Channel DC*6 is a ownlink or !plink transport channel. The

DC* is trans#itte o'er the entire cell or o'er only a part o% the cell !sing e.g. ea#/

%or#ing antennas.

There are si types o% co##on transport channels C*) ,$C*) PC*) "$C*) CPC*

an DC*.

roacast Channel /C*

The roacast Channel C*6 is a ownlink transport channel that is !se to roacast

syste#/ an cell/speci%ic in%or#ation. The C* is always trans#itte o'er the entire

cell an has a single transport %or#at.

,orwar $ccess Channel /,$C*

The ,orwar $ccess Channel ,$C*6 is a ownlink transport channel. The ,$C* is

trans#itte o'er the entire cell. (t is !se to trans#it control i#%or#ation a%ter

asestation ha'e recei'e the rano# access re7!ire#ent sent y U8. ,$C* is also

can e !se to sen paket ata.

There is one or se'eral ,$C* within one cell. 9ne o% the# #!st has low atarate so all

ter#inals in this cell can recei'e it. The others can ha'e high atarate.

Paging Channel / PC*

The Paging Channel PC*6 is a ownlink transport channel. The PC* is always

trans#itte o'er the entire cell. The trans#ission o% the PC* is associate with the

trans#ission o% physical/layer generate Paging (nicators) to s!pport e%%icient sleep/

#oe proce!res.

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"ano# $ccess Channel / "$C*

The "ano# $ccess Channel "$C*6 is an !plink transport channel. The "$C* isalways recei'e %ro# the entire cell. (t is !se to carry control in%or#ation s!ch as call

set!p re7!est6 sent y U8.The "$C* is characteri:e y a collision risk an y eing

trans#itte !sing open loop power control.

Co##non Packet Channel / CPC*

The Co##on Packet Channel CPC*6 is an !plink transport channel. CPC* is

associate with a eicate channel on the ownlink which pro'ies power control an

CPC* Control Co##ans e.g. 8#ergency top6 %or the !plink CPC*. The CPC* is

characterise y initial collision risk an y eing trans#itte !sing inner loop power

control.

Downlink hare Channel / DC*

The Downlink hare Channel DC*6 is a ownlink transport channel share y

se'eral U8s The DC* is associate with one or se'eral ownlink DC*. The DC* is

trans#itte o'er the entire cell or o'er only a part o% the cell !sing e.g. ea#/%or#ing

antennas.

1.3 Physical channels

Physical channels are e%ine y a speci%ic carrier %re7!ency) scra#ling coe)

channeli:ation coe optional6) ti#e start ; stop gi'ing a !ration6 an) on the !plink)

relati'e phase 0 or 26. There is 2 types o% physical channel. Uplink physical an

ownlink physical.

1.3.1 Uplin physical channels

There are 2 types o% !plink eicate physical channelsUplink Deicate Physical

Data Channel an Uplink Deicate Physical Control Channel6 an 2 types o% !plink

co##on physical channels Physical "ano# $ccess Channel an Physical Co##on

Packet Channel6 ill!strate as ,ig!re 4

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UMT "aio Channel

,ig!re 4 !plink physical channels

Uplink eicate physical channels

There are two types o% !plink eicate physical channels) the !plink Deicate

Physical Data Channel !plink DPDC*6 an the !plink Deicate Physical Control

Channel !plink DPCC*6.The DPDC* an the DPCC* are (< coe #!ltiplee

within each raio %ra#e

The !plink DPDC* is !se to carry the DC* transport channel. There #ay e :ero)

one) or se'eral !plink DPDC*s on each raio link.

The !plink DPCC* is !se to carry control in%or#ation generate at Layer 1. The

Layer 1 control in%or#ation consists o% known pilot its to s!pport channel esti#ation

%or coherent etection) trans#it power/control TPC6 co##ans) %eeack in%or#ation

,(6) an an optional transport/%or#at co#ination inicator T,C(6. The transport/

%or#at co#ination inicator in%or#s the recei'er ao!t the instantaneo!s transport

%or#at co#ination o% the transport channels #appe to the si#!ltaneo!sly trans#itte

!plink DPDC* raio %ra#e. There is one an only one !plink DPCC* on each raio

link.

,ig!re 5 shows the %ra#e str!ct!re o% the !plink eicate physical channels. 8ach

raio %ra#e o% length 10 #s is split into 15 slots) each o% length T slot= 25>0 chips)

corresponing to one power/control perio.

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,ig!re 5 %ra#e str!ct!re o% !plink eicate physical channel

The para#eter k in %ig!re eter#ines the n!#er o% its per !plink DPDC* slot. (t is

relate to the spreaing %actor , o% the DPDC* as , = 25>2 k. The DPDC*

spreaing %actor #ay range %ro# 25> own to 4. The spreaing %actor o% the !plink

DPCC* is always e7!al to 25>) i.e. there are 10 its per !plink DPCC* slot.

The eact n!#er o% its o% the !plink DPDC* an the i%%erent !plink DPCC* %iels

&pilot) &T,C() &,() an &TPC6 is con%ig!re y higher layers an can also e recon%ig!re

y higher layers.

The ,( its are !se to s!pport techni7!es re7!iring %eeack %ro# the U8 to the

UT"$& $ccess Point) incl!ing close loop #oe trans#it i'ersity an site selection

i'ersity trans#ission DT6.

There are two types o% !plink eicate physical channels? those that incl!e T,C(

e.g. %or se'eral si#!ltaneo!s ser'ices6 an those that o not incl!e T,C( e.g. %or

%ie/rate ser'ices6. (t is the UT"$& that eter#ines i% a T,C( sho!l e trans#itte

an it is #anatory %or all U8s to s!pport the !se o% T,C( in the !plink.

&pilot345>@an AThe shaowe col!#n part o% pilot it pattern is

e%ine as ,B an ,Bs can e !se to con%ir# %ra#e synchroni:ation. The 'al!e

o% the pilot it pattern other than ,Bs shall e 1.6

TPC is corresponing to power contrl co##an.

M!lti/coe operation is possile %or the !plink eicate physical channels. Bhen

#!lti/coe trans#ission is !se) se'eral parallel DPDC* are trans#itte !sing

i%%erent channeli:ation coes. *owe'er) there is only one DPCC* per raio link.

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UMT "aio Channel

Uplink co##on physical channels

1.3.1.1 Physical Rando! Access Channel "PRAC#$

The rano#/access trans#ission is ase on a lotte $L9*$ approach with %ast

ac7!isition inication. The U8 can start the rano#/access trans#ission at the

eginning o% a n!#er o% well/e%ine ti#e inter'als) enote access slots. There are

15 access slots per two %ra#es an they are space 5120 chips apart (n%or#ation on

what access slots are a'ailale %or rano#/access trans#ission is gi'en y higher

layers.The rano#/access trans#ission consists o% one or se'eral preambleso% length

40> chips an a messageo% length 10 #s or 20 #s.

Pilot

&pilotits

Data&ataits

lot E0 lot E1 lot Ei lot E14

Tslot= 25>0 chips) 10F2kits k=0..36

Message part raio %ra#e T"$C*= 10 #s

Data

ControlT,C(

&T,C(its

,ig!re > %ra#e str!ct!re o% rano# access channel

8ach prea#le is o% length 40> chips an consists o% 25> repetitions o% a signat!re o%

length 1> chips. There are a #ai#!# o% 1> a'ailale signat!res .

The 10 #s #essage part raio %ra#e is split into 15 slots) each o% length T slot = 25>0

chips. 8ach slot consists o% two parts) a ata part to which the "$C* transport channel

is #appe an a control part that carries Layer 1 control in%or#ation. The ata an

control parts are trans#itte in parallel.

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$ 10 #s #essage part consists o% one #essage part raio %ra#e) while a 20 #s #essage

part consists o% two consec!ti'e 10 #s #essage part raio %ra#es. The #essage part

length is e7!al to the Trans#ission Ti#e (nter'al o% the "$C* Transport channel in

!se. This TT( length is con%ig!re y higher layers.

The ata part consists o% 10F2kits) where k=0)1)2)3. This correspons to a spreaing

%actor o% 25>) 12A) >4) an 32 respecti'ely %or the #essage ata part.

The control part consists o% A known pilot its to s!pport channel esti#ation %or

coherent etection an 2 T,C( its. This correspons to a spreaing %actor o% 25> %or

the #essage control part. The pilot it pattern is escrie in tale A. The total n!#er

o% T,C( its in the rano#/access #essage is 15F2 = 30. The T,C( o% a raio %ra#einicates the transport %or#at o% the "$C* transport channel #appe to the

si#!ltaneo!sly trans#itte #essage part raio %ra#e. (n case o% a 20 #s P"$C*

#essage part) the T,C( is repeate in the secon raio %ra#e.

1.3.1.2 Physical Co!!on Pacet ChannelPCPC#

The Physical Co##on Packet Channel PCPC*6 is !se to carry the CPC* CPC*.

The CPC* trans#ission is ase on DM$/CD approach with %ast ac7!isition

inication. The U8 can start trans#ission at the eginning o% a n!#er o% well/e%ine

ti#e/inter'als) relati'e to the %ra#e o!nary o% the recei'e C* o% the c!rrent cell.

The PCPC* access trans#ission consists o% one or se'eral $ccess Prea#les G$/PH o%

length 40> chips) one Collision Detection Prea#le CD/P6 o% length 40> chips) a

DPCC* Power Control Prea#le PC/P6 which is either 0 slots or A slots in length)

an a #essage o% 'ariale length &10 #s.

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UMT "aio Channel

Pilot&pilotits

TPC

&TPCits

Data

&ataits


Tslot= 25>0 chips) 10F2kits k=0..>6

1 raio %ra#e T%= 10 #s

Data

Control,(

&,(itsT,C(&T,C(its

,ig!re @ %ra#e str!ct!re o% CPC*

CPC* access prea#le part

i#ilar to "$C* prea#le part. The "$C* prea#le signat!re se7!ences are !se.

The n!#er o% se7!ences !se co!l e less than the ones !se in the "$C* prea#le.

The scra#ling coe co!l either e chosen to e a i%%erent coe seg#ent o% the -ol

coe !se to %or# the scra#ling coe o% the "$C* prea#les or co!l e the sa#e

scra#ling coe in case the signat!re set is share.

CPC* collision etection prea#le part

i#ilar to "$C* prea#le part. The "$C* prea#le signat!re se7!ences are !se.

The scra#ling coe is chosen to e a i%%erent coe seg#ent o% the -ol coe !se to

%or# the scra#ling coe %or the "$C* an CPC* prea#les

CPC* power control prea#le part

The power control prea#le seg#ent is calle the CPC* Power Control Prea#le

PC/P6 part. The Power Control Prea#le length is a higher layer para#eter) Lpc/prea#le)

which shall take the 'al!e 0 or A slots. The T,C( %iel is %ille with 1 its.

CPC* #essage part

i#ilar to !plink eicate channel) 8ach 10 #s %ra#e is split into 15 slots) each o%

length Tslot = 25>0 chips. 8ach slot consists o% two parts) a ata part that carries higher

layer in%or#ation an a control part that carries Layer 1 control in%or#ation. The ata

an control parts are trans#itte in parallel. The s% o% CPC* #essage part is 25>

1.3.2 %o&nlin physical channel

Downlink physical channels incl!e Deteicate physical channel I one hare

Physical ChannelI %i'e Co##non Control Channel

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ownlink Deteicate physical channel /DPC*

pri#ary an seconary Co##non Pilot Channel / CP(C*

pri#ary an seconary Co##on Control Physicl Channel / CCPC*

ynchrono!s Channel / C*

Physical Downlink hare Channel / DC*

$c7!isition (nication Channel / $(C*

Paging (nication Channel / P(C*

ownlink physical are ill!strate as ,ig!re A

,ig!re A

1.3.2.1 %o&nlin %edicated Physical Channel

There is only one type o% ownlink eicate physical channel) the Downlink

Deicate Physical Channel ownlink DPC*6.

Bithin one ownlink DPC*) eicate ata generate at Layer 2 an ao'e) i.e. theeicate transport channel DC*6) is trans#itte in ti#e/#!ltiple with control

in%or#ation generate at Layer 1 known pilot its) TPC co##ans) an an optional

T,C(6. The ownlink DPC* can th!s e seen as a ti#e #!ltiple o% a ownlink

DPDC* an a ownlink DPCC*.

8ach %ra#e o% length 10 #s is split into 15 slots) each o% length Tslot = 25>0 chips)

corresponing to one power/control perio.


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UMT "aio Channel

,ig!re %ra#e str!ct!re o% DL DPC*

The para#eter k in %ig!re eter#ines the total n!#er o% its per ownlink DPC*

slot. (t is relate to the spreaing %actor , o% the physical channel as , = 5122 k. The

spreaing %actor #ay th!s range %ro# 512 own to 4.

The eact n!#er o% its o% the i%%erent ownlink DPC* %iels &pilot) &TPC) &T,C()

&ata1an &ata26 is gi'en in tale 11. Bhat slot %or#at to !se is con%ig!re y higher

layers an can also e recon%ig!re y higher layers.

There are asically two types o% ownlink Deicate Physical Channels? those that

incl!e T,C( e.g. %or se'eral si#!ltaneo!s ser'ices6 an those that o not incl!e

T,C( e.g. %or %ie/rate ser'ices6. (t is the UT"$& that eter#ines i% a T,C( sho!l

e trans#itte an it is #anatory %or all U8s to s!pport the !se o% T,C( in the

ownlink.

&pilot24A ; 1>

TPC sy#ol is corresponing to transi#ission power control co##an T

0or1

Downlink Co##on Physical Channel

1.3.2.2 Co!!on Pilot Channel "CP'C#$

The CP(C* is a %ie rate 30 kps) ,=25>6 ownlink physical channel that carries a

pre/e%ine it se7!ence. There are two types o% Co##on pilot channels) the Pri#ary

an econary CP(C*. They i%%er in their !se an the li#itations place on their

physical %eat!res.,ig show the %ra#e str!ct!re o% CP(C*.


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Pre/e%ine it se7!ence


Tslot= 25>0 chips ) 20 its

1 raio %ra#e T = 10 #s

slot E1

,ra#eEiJ1,ra#eEi

slot E14

$ntenna 2

$ntenna 1

slot E0

,ra#e .o!nary

0 0 0 0 0 0 0 0 0 00 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

1 1 1 1 0 0 0 0 1 11 10 0 0 0 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1

The Pri#ary Co##on Pilot Channel P/CP(C*6 has the %ollowing characteristics

The sa#e channeli:ation coe is always !se %or the P/CP(C*) see G4H?

The P/CP(C* is scra#le y the pri#ary scra#ling coe) see G4H?

/ There is one an only one P/CP(C* per cell?

/ The P/CP(C* is roacast o'er the entire cell.

The Pri#ary CP(C* is a phase re%erence %or the %ollowing ownlink channels C*)

Pri#ary CCPC*) $(C*) P(C* $P/$(C*) CDC$/(C*) C(C*) DL/DPCC* %or

CPC* an the /CCPC*. y e%a!lt) the Pri#ary CP(C* is also a phase re%erence %or

ownlink DPC* an any associate PDC*. The U8 is in%or#e y higher layer

signalling i% the P/CP(C* is not a phase re%erence %or a ownlink DPC* an any

associate PDC*.The Pri#ary CP(C* is always a phase re%erence %or a ownlink

physical channel !sing close loop TK i'ersity.

$ econary Co##on Pilot Channel /CP(C*6 has the %ollowing characteristics

$n aritrary channeli:ation coe o% ,=25> is !se %or the /CP(C*) see G4H?

$ /CP(C* is scra#le y either the pri#ary or a seconary scra#ling coe)

There #ay e :ero) one) or se'eral /CP(C* per cell?

$ /CP(C* #ay e trans#itte o'er the entire cell or only o'er a part o% the cell?

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UMT "aio Channel

$ econary CP(C* #ay e a phase re%erence %or a ownlink DPC*. (% this is the

case) the U8 is in%or#e ao!t this y higher/layer signalling.The econary CP(C*

can e a phase re%erence %or a ownlink physical channel !sing open loop TK i'ersity)

instea o% the Pri#ary CP(C* eing a phase re%erence.

&ote that it is possile that neither the P/CP(C* nor any /CP(C* is a phase re%erence

%or a ownlink DPC*.

1.3.2.3 Pri!ary Co!!non Control Physical Channel "P(CCPC#$

Co##on control physical channel consists o% Pri#ary Co##on Control Physical

Channel PCCPC*6 an econary Co##on Control Physical Channel CCPC*6.

The Pri#ary CCPC* is a %ie rate 30 kps) ,=25>6 ownlink physical channels

!se to carry the C* transport channel.

Data

&ata1=1A its


Tslot= 25>0 chips ) 20 its


T 9,,6

25> chips

,ig!re shows the %ra#e str!ct!re o% the Pri#ary CCPC*. The %ra#e str!ct!re i%%ers

%ro# the ownlink DPC* in that no TPC co##ans) no T,C( an no pilot its are

trans#itte. The Pri#ary CCPC* is not trans#itte !ring the %irst 25> chips o% each

slot. (nstea) Pri#ary C* an econary C* are trans#itte !ring this perio

1.3.2.) econdary Co!!non Control Physical Channel "P(CCPC#$

The econary CCPC* is !se to carry the ,$C* an PC*. There are two types o%

econary CCPC* those that incl!e T,C( an those that o not incl!e T,C(. (t is

the UT"$& that eter#ines i% a T,C( sho!l e trans#itte) hence #aking it

#anatory %or all U8s to s!pport the !se o% T,C(. The set o% possile rates %or the

econary CCPC* is the sa#e as %or the ownlink DPC*. ,ig show the %ra#e

str!ct!re o% /CCPC*

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Tslot= 25>0 chips) 20F2k

its k=0..>6

Pilot

&pilotits

Data

&ata1its


T,C(

&T,C(its

The para#eter k in %ig!re 1@ eter#ines the total n!#er o% its per ownlink

econary CCPC* slot. (t is relate to the spreaing %actor , o% the physical channel

as , = 25>2k. The spreaing %actor range is %ro# 25> own to 4. The ,$C* an

PC* can e #appe to the sa#e or to separate econary CCPC*s.

(% ,$C* an PC* are #appe to the sa#e econary CCPC*) they can e #appe to

the sa#e %ra#e. The #ain i%%erence etween a CCPC* an a ownlink eicate

physical channel is that a CCPC* is not inner/loop power controlle. The #ain

i%%erence etween the Pri#ary an econary CCPC* is that the transport channel

#appe to the Pri#ary CCPC* C*6 can only ha'e a %ie pree%ine transport

%or#at co#ination) while the econary CCPC* s!pport #!ltiple transport %or#at

co#inations !sing T,C(.

1.3.2.* Synchrono+s Channel "SC#$

The ynchronisation Channel C*6 is a ownlink signal !se %or cell search. The

C* consists o% two s! channels) the Pri#ary an econary C*. The 10 #s raio

%ra#es o% the Pri#ary an econary C* are i'ie into 15 slots) each o% length

25>0 chips. ,ig!re ill!strates the str!ct!re o% the C* raio %ra#e.

PrimarySCH

SecondarySCH

256 chips

2560 chips

One 10 ms SCH radio frame

acs,

acp

acs,

acp

acs,

acp

Slot #0 Slot #1 Slot #14

The Pri#ary C* consists o% a #o!late coe o% length 25> chips) the Pri#ary

ynchronisation Coe PC6 enote cp in %ig!re ) trans#itte once e'ery slot. The

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UMT "aio Channel

PC is the sa#e %or e'ery cell in the syste#.

The econary C* consists o% repeately trans#itting a length 15 se7!ence o%#o!late coes o% length 25> chips) the econary ynchronisation Coes C6)

trans#itte in parallel with the Pri#ary C*. The C is enote csi)k in %ig!re )

where i = 0) 1) ) >3 is the n!#er o% the scra#ling coe gro!p) an k = 0) 1) ) 14

is the slot n!#er. 8ach C is chosen %ro# a set o% 1> i%%erent coes o% length 25>.

This se7!ence on the econary C* inicates which o% the coe gro!ps the cells

ownlink scra#ling coe elongs to.

1.3.2., Physical %o&nlin Shared Channel "P%SC#$

The Physical Downlink hare Channel PDC*6 is !se to carry the Downlink

hare Channel DC*6.

$ PDC* correspons to a channelisation coe elow or at a PDC* root

channelisation coe. $ PDC* is allocate on a raio %ra#e asis to a single U8.

Bithin one raio %ra#e) UT"$& #ay allocate i%%erent PDC*s !ner the sa#e

PDC* root channelisation coe to i%%erent U8s ase on coe #!ltipleing. Bithin

the sa#e raio %ra#e) #!ltiple parallel PDC*s) with the sa#e spreaing %actor) #ay

e allocate to a single U8. This is a special case o% #!lticoe trans#ission. $ll the

PDC*s are operate with raio %ra#e synchronisation.

PDC*s allocate to the sa#e U8 on i%%erent raio %ra#es #ay ha'e i%%erent

spreaing %actors.

The %ra#e an slot str!ct!re o% the PDC* are shown on %ig!re .


Tslot= 25>0 chips) 20F2kits k=0..>6

Data

&ata1its


,or each raio %ra#e) each PDC* is associate with one ownlink DPC*. The

PDC* an associate DPC* o not necessarily ha'e the sa#e spreaing %actors an

are not necessarily %ra#e aligne.

$ll rele'ant Layer 1 control in%or#ation is trans#itte on the DPCC* part o% the

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19/26


associate DPC*) i.e. the PDC* oes not carry Layer 1 in%or#ation. To inicate %or

U8 that there is ata to ecoe on the DC*) the T,C( %iel o% the associate DPC*

shall e !se.

The T,C( in%or#s the U8 o% the instantaneo!s transport %or#at para#eters relate to

the PDC* as well as the channelisation coe o% the PDC*.

1.3.2.- Ac+sition 'ndication Channel"A'C#$

The $c7!isition (nicator channel $(C*6 is a %ie rate ,=25>6 physical channel

!se to carry $c7!isition (nicators $(6. $c7!isition (nicator $(s correspons to

signat!re s on the P"$C*.

,ig!re ill!strates the str!ct!re o% the $(C*. The $(C* consists o% a repeate se7!ence

o% 15 consec!ti'e access slots $6) each o% length 5120 chips. 8ach access slot

consists o% two parts) anAcquisition-Indicator $(6 part consisting o% 32 real/'al!e

sy#ols a0) ) a31an a part o% !ration 1024 chips with no trans#ission that is not

%or#ally part o% the $(C*. The part o% the slot with no trans#ission is reser'e %or

possile !se y C(C* or possile %!t!re !se y other physical channels.

The spreaing %actor ,6 !se %or channelisation o% the $(C* is 25>.

The phase re%erence %or the $(C* is the Pri#ary CP(C*.

1024 chips

Transmission Off

AS /1) AS /0 AS /1 AS /i AS /1) AS /0

a1 a2a0 a31a30

! part "406 chips, $2 real%&al'ed sym(ols

20 ms

1.3.2. CPC# Access Prea!le Ac+sition 'ndication Channel "AP(A'C#$

The $ccess Prea#le $c7!isition (nicator channel $P/$(C*6 is a %ie rate

,=25>6 physical channel !se to carry $P ac7!isition inicators $P(6 o% CPC*. $P

ac7!isition inicator $P(scorrespons to $P signat!restrans#itte y U8.

$P/$(C* an $(C* #ay !se the sa#e or i%%erent channelisation coes. The phase

re%erence %or the $P/$(C* is the Pri#ary CP(C*. ,ig!re ill!strates the str!ct!re o%

$P/$(C*.

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UMT "aio Channel

1024 chips

Transmission Off

AS /1) AS /0 AS /1 AS /i AS /1) AS /0

a1 a2a0 a31a30

P! part " 406 chips, $2 real%&al'ed sym(ols

20 ms

The $P/$(C* has a part o% !ration 40> chips where the $P ac7!isition inicator

$P(6 is trans#itte) %ollowe y a part o% !ration 1024chips with no trans#ission

that is not %or#ally part o% the $P/$(C*. The part o% the slot with no trans#ission isreser'e %or possile !se y C(C* or possile %!t!re !se y other physical channels.

1.3.2. CPC# Collision %etection4Channel Assign!ent 'ndicator Channel "C%4CA ('C#$

The Collision Detection Channel $ssign#ent (nicator channel CDC$/(C*6 is a

%ie rate ,=25>6 physical channel !se to carry CD (nicator CD(6 only i% the C$

is not acti'e) or CD (nicatorC$ (nicator CD(C$(6 at the sa#e ti#e i% the C$ is

acti'e. The str!ct!re o% CDC$/(C* is shown in %ig!re .

1024 chips

Transmission Off

AS /1) AS /0 AS /1 AS /i AS /1) AS /0

a1 a2a0 a31a30

C)!*C! part " 406 chips, $2 real%&al'ed sym(ols

20 ms

CDC$/(C* an $P/$(C* #ay !se the sa#e or i%%erent channelisation coes.

The CDC$/(C* has a part o% !ration o% 40>chips where the CD(C$( is

trans#itte) %ollowe y a part o% !ration 1024chips with no trans#ission that is not

%or#ally part o% the CDC$/(C*. The part o% the slot with no trans#ission is reser'e

%or possile !se y C(C* or possile %!t!re !se y other physical channels.

The spreaing %actor ,6 !se %or channelisation o% the CDC$/(C* is 25>.

1.3.2.10 Paging 'ndication Channel "P'C#$

The Paging (nicator Channel P(C*6 is a %ie rate ,=25>6 physical channel !se to

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carry the paging inicators. The P(C* is always associate with an /CCPC* to which

a PC* transport channel is #appe.

,ig!re 24 ill!strates the %ra#e str!ct!re o% the P(C*. 9ne P(C* raio %ra#e o% length

10 #s consists o% 300 its 0) 1) ) 26. 9% these) 2AA its 0) 1) ) 2A@6 are !se

to carry paging inicators. The re#aining 12 its are not %or#ally part o% the P(C* an

shall not e trans#itte DTK6. The part o% the %ra#e with no trans#ission is reser'e

%or possile %!t!re !se.

(1(0

2++ (its for pain indication12 (its -transmission

off.

One radio frame -10 ms.

(2+/ (2++ (2

(n each P(C* %ra#e) &p paging inicators NP0) ) P&p/1O are trans#itte) where

&p=1A) 3>) @2) or 144.

The P( calc!late y higher layers %or !se %or a certain U8) is associate to the paging

inicator Pq) where q is co#p!te as a %!nction o% the P( co#p!te y higher layers)

the ,& o% the P/CCPC* raio %ra#e !ring which the start o% the P(C* raio %ra#e

occ!rs) an the n!#er o% paging inicators per %ra#e &p6

( )( )( ) NpNp

SFNSFNSFNSFNPIq #o144

144#o512>4A1A

++++=

,!rther) the P( calc!late y higher layers is associate with the 'al!e o% the paging

inicator Pq. (% a paging inicator in a certain %ra#e is set to 1 it is an inication that

U8s associate with this paging inicator an P( sho!l rea the corresponing %ra#e

o% the associate /CCPC*.

The P( it#ap in the PC* ata %ra#es o'er (! contains inication 'al!es %or all higher

layer P( 'al!es possile. 8ach it in the it#ap inicates i% the paging inicator

associate with that partic!lar P( shall e set to 0 or 1. *ence) the calc!lation in the

%or#!la ao'e is to e per%or#e in &oe to #ake the association etween P( an

Pq..The #apping %ro# NP0) ) P&p/1O to the P(C* its N0) ) 2A@O are accoring to

Tale 1.

Tale 1 Mapping o% paging inicators P7to P(C* its

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UMT "aio Channel

&!#er o% paging

inicators per %ra#e &p6P7= 1 P7= 0

&p=1A N1>7) ) 1>7J15O = N1) 1)

) 1O

N1>7) ) 1>7J15O = N0) 0)

) 0O

&p=3> NA7) ) A7J@O = N1) 1))

1O

NA7) ) A7J@O = N0) 0))

0O

&p=@2 N47) ) 47J3O = N1) 1))

1O

N47) ) 47J3O = N0) 0))

0O

&p=144 N27) 27J1O = N1) 1O N27) 27J1O = N0) 0O

1.) Channel Mapping

Mapping etween logical channels an transport channels

,ig!re 10ill!strates the #apping etween logical channel an transport channels.

,ig!re 10 #apping etween logical channel an transport channels

,ig!re 11ill!strates the #apping etween transport channel an physical channels.

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,ig!re 11 #apping etween transport channel an physical channels.

(n aition to the transport channels intro!ce earlier) there eist physical channels

tocarry only in%or#ation rele'ant to physical layer proce!res. The ynchronisation

ChannelC*6) the Co##on Pilot Channel CP(C*6 an the $c7!isition (nication

Channel $(C*6are not irectly 'isile to higher layers an are #anatory %ro# the

syste# %!nction point o%'iew) to e trans#itte %ro# e'ery ase station. The CPC*

tat!s (nication ChannelC(C*6 an the Collision DetectionChannel $ssign#ent

(nication Channel CDC$/(C*6 are neee i% CPC* is !se.


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2 Physical layer porced+re

2.1 Cell search proced+re

D!ring the cell search) the U8 searches %or a cell an eter#ines the ownlink

scra#ling coe an %ra#e synchronisation o% that cell. The cell search is typically

carrie o!t in three steps

tep 1 slot synchrono!s

D!ring the %irst step o% the cell search proce!re the U8 !ses the C*s pri#ary

synchronisation coe to ac7!ire slot synchronisation to a cell. This is typically one

with a single #atche %ilter or any si#ilar e'ice6 #atche to the pri#ary

synchronisation coe which is co##on to all cells. The slot ti#ing o% the cell can e

otaine y etecting peaks in the #atche %ilter o!tp!t.

tep 2 %ra#e synchrono!s an coe/gro!p ienti%ication

D!ring the secon step o% the cell search proce!re) the U8 !ses the C*s seconary

synchronisation coe to %in %ra#e synchronisation an ienti%y the coe gro!p o% the

cell %o!n in the %irst step. This is one y correlating the recei'e signal with all

possile seconary synchronisation coe se7!ences) an ienti%ying the #ai#!#

correlation 'al!e. ince the cyclic shi%ts o% the se7!ences are !ni7!e the coe gro!p as

well as the %ra#e synchronisation is eter#ine.

tep 3 scra#ling/coe ienti%ication

D!ring the thir an last step o% the cell search proce!re) the U8 eter#ines the eact

pri#ary scra#ling coe !se y the %o!n cell. The pri#ary scra#ling coe is

typically ienti%ie thro!gh sy#ol/y/sy#ol correlation o'er the CP(C* with all

coes within the coe gro!p ienti%ie in the secon step. $%ter the pri#ary scra#ling

coe has een ienti%ie) the Pri#ary CCPC* can e etecte.$n the syste#/ an cell

speci%ic C* in%or#ation can e rea.

2.2 Rando! Access Proced+re

$t each initiation o% the physical rano# access proce!re) Layer 1 shall recei'e the

%ollowing in%or#ation %ro# the higher layers M$C6

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The Transport ,or#at to e !se %or the P"$C* #essage part.

The $C o% the P"$C* trans#ission.

The ata to e trans#itte Transport lock et6.

The physical rano#/access proce!re shall e per%or#e as %ollows

1. Deri'e the a'ailale !plink access slots) in the net %!ll access slot set) %or the set

o% a'ailale "$C* s!/channels within the $C "ano#ly select one access slot

a#ong the ones pre'io!sly eter#ine. (% there is no access slot a'ailale in the

selecte set) rano#ly select one !plink access slot corresponing to the set o%

a'ailale "$C* s!/channels within the gi'en $C %ro# the net access slot set. The

rano# %!nction shall e s!ch that each o% the allowe selections is chosen with e7!al

proaility.

2. "ano#ly select a signat!re %ro# the set o% a'ailale signat!res within the gi'en

$C. The rano# %!nction shall e s!ch that each o% the allowe selections is chosen

with e7!al proaility.

3. et the Prea#le "etrans#ission Co!nter to Prea#le "etrans Ma.

4. et the para#eter Co##ane Prea#le Power to Prea#leQ(nitialQPower.

5. (n the case that the Co##ane Prea#le Power ecees the #ai#!# allowe

'al!e) set the prea#le trans#ission power to the #ai#!# allowe power. (n the case

that the Co##ane Prea#le Power is elow the #ini#!# le'el re7!ire in G@H) set

the prea#le trans#ission power to a 'al!e) which shall e at or ao'e the

Co##ane Prea#le Power an at or elow the re7!ire #ini#!# power speci%ie

in G@H. 9therwise set the prea#le trans#ission power to the Co##ane Prea#le

Power. Trans#it a prea#le !sing the selecte !plink access slot) signat!re) an

prea#le trans#ission power.

>. (% no positi'e or negati'e ac7!isition inicator $( J1 nor R16 corresponing to

the selecte signat!re is etecte in the ownlink access slot corresponing to the

selecte !plink access slot

elect the net a'ailale access slot in the set o% a'ailale "$C* s!/channels

within the gi'en $C.

"ano#ly select a new signat!re %ro# the set o% a'ailale signat!res within the

gi'en $C. The rano# %!nction shall e s!ch that each o% the allowe selections

is chosen with e7!al proaility.

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(ncrease the Co##ane Prea#le Power y P0 = Power "a#p tep GH. (% the

Co##ane Prea#le Power ecees the #ai#!# allowe power y >) the

U8 #ay pass L1 stat!s &o ack on $(C*6 to the higher layers M$C6 an eit

the physical rano# access proce!re.

Decrease the Prea#le "etrans#ission Co!nter y one.

(% the Prea#le "etrans#ission Co!nter S 0 then repeat %ro# step 5. 9therwise

pass L1 stat!s &o ack on $(C*6 to the higher layers M$C6 an eit the

physical rano# access proce!re.

@. (% a negati'e ac7!isition inicator corresponing to the selecte signat!re is

etecte in the ownlink access slot corresponing to the selecte !plink access slot)

pass L1 stat!s &ack on $(C* recei'e6 to the higher layers M$C6 an eit the


A. Trans#it the rano# access #essage three or %o!r !plink access slots a%ter the

!plink access slot o% the last trans#itte prea#le epening on the $(C* trans#ission

ti#ing para#eter. Trans#ission power o% the control part o% the rano# access

#essage sho!l e P p/# GH higher than the power o% the last trans#itte prea#le.

. Pass L1 stat!s "$C* #essage trans#itte to the higher layers an eit the


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02 Wo_bt1003_e01_0 Umts Radio Channel-29

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