Call Flow UMTS v2

7/24/2019 Call Flow UMTS v2

http://slidepdf.com/reader/full/call-flow-umts-v2 1/20

PLMN Selection: There are two modes for PLMN selection:Automatic mode: This mode utilizes a list of PLMNs in priority order. The highest priorityPLMN which is available and allowable is selected.Manual mode: ere the M! indicates to the user which PLMNs are available. "nly when the

user ma#es a manual selection does the M! try to obtain normal service on the $PLMN.%orbidden LA&stored in M! ' !(M): No !uitable *ells (n Location Area. "n re+uest of the NA! the A! should perform a search for available PLMNs and report

them to NA!. The ,- shall scan all % channels in the ,TA bands according to its capabilities to /ndavailable PLMNs. "n each carrier0 the ,- shall search for the strongest cell and read itssystem information0 in order to /nd out which PLMN the cell belongs to. (f the ,- can readone or several PLMN identities in the strongest cell0 each found PLMN shall be reported to theNA! as a high +uality PLMN &but without the !*P value)0 provided that the following high+uality criterion is ful/lled:• %or an %11 cell0 the measured primary *P(* !*P value shall be greater than or e+ual to

234 d5m.• %or a T11 cell0 the measured P2**P* !*P shall be greater than or e+ual to 267 d5m.%ound PLMNs that do not satisfy the high +uality criterion0 but for which the ,- has been ableto read the PLMN identities are reported to the NA! together with the *P(* !*P value for

,TA %11 cells and P2**P* !*P for ,TA T11 cells. The +uality measure reported by the,- to NA! shall be the same for each PLMN found in one cell. The search for PLMNs on the rest of the carriers may be stopped on re+uest of the NA!. The,- may optimize this search by using stored information of carrier fre+uencies and optionallyalso information on cell parameters0 e.g. scrambling codes0 from previously receivedmeasurement control information elements.



Initial UE Cell Selection: The purpose of the initial cell2selection procedure is to /nd a cell0 not necessarily the

best cell0 but a usable cell0 for the ,- to camp on after power2on. (n the ,TAN0 thenumber of carrier fre+uencies is +uite small. "ne operator typically operates only ontwo or three fre+uency carriers. (n the /rst phase of ,MT! in -urope0 the fre+uency

allocation for ,MT!2%11 is 8 9 ; Mz &uplin#<downlin#)0 which means that there canbe0 at most0 only =8 carrier fre+uencies of 42Mz bandwidth each. These carriers arethen divided between up to si> operators. -ach carrier will only support one operator.

(n principle the process includes the following:• !earch for primary synchronization channels &P2!*s)?• "nce such a channel is found0 ac+uire time2slot synchronization from it?• Ac+uire frame synchronization from the corresponding !2!*?• Ac+uire the primary scrambling code from the corresponding *P(*?• 1ecode system information from the cell to chec# whether it is a suitable cell for

camping &i.e.0 it contains the right PLMN code and access to it is allowed). The situation is di@erent if the ,- is roaming abroad0 and the home PLMN is not found.

(n that case * has to report all available PLMNs to NA! and wait for its selectiondecision0 which can be either automatic or manual &user selection).

The initial cell2selection process is repeated as many times as necessary until the /rstsuitable cell is found for camping. "nce the ,- has managed to camp on a cell0 it

decodes the system information from it0 including the neighbor cell list. Thisinformation can be used to help the ,- /nd the best cell to camp onto. Note that theinitial cell2selection procedure only found a cell to camp on &the /rst possible cell). (t ispossible that this cell will not be the best possible cell.



Radio Frame Synchronisation

*p *p *p

*s= *s=*s8

Primary !*

!econdary !*

Primary **P*

84chips

84; 2 84chips

!lot = !lot 8 !lot =4 !lot =

The ,- completes the three step radio frame synchronisation process!tep =: Primary !* identi/cation and slot synchronisation

&completed during cell search)&each cell in networ# uses samechip se+uence)

!tep 8: *ode group identi/cation and frame synchronisationusing the !econdary !*&collection of =4 se+uences0 repeatedevery =;ms)

!tep : !crambling code identi/cation using the *P(*aving completed these three steps the ,- is able to decode the

Primary **P* 2B 5* 2B 5**

,- ispoweredup

ead 5**

*ell selection

egister withcore networ#

"riginating

AM speechcall

andovers

elease of AMspeech call

adio framesynchronisation

*ell search

Primary *P(*



Relation between S-SCH & Scrambling Code Group



5 © Nokia Siemens Networks Presentation / Author / Date

For internal use

RACH Process

1ownlin#

5!

L= A*C < A(*

,plin#

M! Preamble=

Not detected

Message partPreamble8

PA*DpreambleDretransE PA* preambles transmitted during one PA* cycle without receiving A(* response

,-t>PowerMa>PA*

F F F F

A*Dt>DMa>E preamble power ramping cycles that can be done before A* transmission failure is reported

Poweramp!tepPA*preamble

Power"@setLastPreamblePA*messag

(nitial preample power:•Pt> G *P(*transmissionPower2!*P&*P(*) H!!(&5!) HPRACHRequiredReceivedCI



UE RNCNodeB MGW/CN*: * *onnection e+uest &A*)

N5AP: adio Lin# !etup e+uest

N5AP: adio Lin# !etup esponse

AL*AP: -I &-stablish e+uest)

AL*AP: -*% &-stablish *on/rm)

*: * *onnection !etup &%A*) JRRCconnRepTimer1/!1""ms#1s$K

L1 Syncroni!ation

N5AP: !ynchronization (ndication

*: * *onnection !etup *omplete &1*)

*: (nitial 1irect Transfer &MM: *M !ervice e+uest)!**P: * &*onnection e+uest)

ANAP: (nitial ,- Message &MM: *M !ervice e+uest)

!**P: ** &*onnection *on/rm)

ANAP: 1irect Transfer &MM: Authentication e+uest)

*: 1ownlin# 1irect Transfer &MM: Authentication e+uest)

*: ,plin# 1irect Transfer &MM: Authentication esponse)

ANAP: 1irect Transfer &MM: Authentication esponse)

ANAP: *ommon (1

ANAP: !ecurity Mode *ommand

*: !ecurity Mode *ommand

%P: 1ownlin# !ynch

%P: ,plin# !ynch

RRC Connection Esta"lis#ent $ CELL %CH State

N* chec#s if resources areavailable: 5T!0 A*0

Transmission.(f not it sends RRCConnection Re&ect

T300!s " #3003

L1 Syncroni!ation

T3$!%s " #3$!

'(C CS 'essage Flow

.L Timeoutnd ..* connec

*all %low



UE RNCNodeB MGW/CN

*: !ecurity Mode *omplete

ANAP: !ecurity Mode *omplete

*: ,plin# 1irect Transfer &**: !etup)

ANAP: 1irect Transfer &**: !etup)

ANAP: 1irect Transfer &**: *all Proceeding)*: 1ownlin# 1irect Transfer &**: *all Proceeding)

ANAP: A5 Assignment e+uest

N5AP: adio Lin# econ/guration Prepare

N5AP: adio Lin# econ/guration eady



N5AP: adio Lin# econ/guration *ommit)

*: adio 5earer !etup

*: adio 5earer !etup *ompleteANAP: A5 Assignment esponse



R)* +stablishment

%P: 1ownlin# !ynch

%P: ,plin# !ynch

R, modiication procedure.

SR*/CH1 H2 resources checed

4ossible ailure in )),!

setup 56ub1 6ur and 6u7

Sot hando8er is not allowed during the R)* establishment procedure 5The mobile can not add or remo8e cells in

)S7 this maes the 9+ and #ode * particularly sensiti8e to mobility and dominance Timer w:rb:setup:cpl 5%s7 is

started when the RRC. Radio *earer Setup message is sent to the 9+ 6n case the timer e;pires 6u Release Re<uest

is sent to the C# with release cause 5radio:conn:lost7

% 1s



Call Esta"lised

UE RNCNodeB

ANAP: 1irect Transfer &**: *onnect)*: 1ownlin# 1irect Transfer &**: *onnect)

*: ,plin# 1irect Transfer &**: *onnect Ac#nowledge)

ANAP: 1irect Transfer &**: *onnect Ac#nowledge)

*: ,plin# 1irect Transfer &**: elease *omplete)

ANAP: 1irect Transfer &**: elease *omplete)

ANAP: (u elease *ommand

*: ,plin# 1irect Transfer &**: 1isconnect)

ANAP: 1irect Transfer &**: 1isconnect)

ANAP: 1irect Transfer &**: elease)

*: 1ownlin# 1irect Transfer &**: elease)

ANAP: (u elease *omplete

MGW/CN

ANAP: Location eport*: Measurement *ontrol

Call isconnect

*: 1ownlin# 1irect Transfer &**: * *onnection elease)



N5AP: adio Lin# 1eletion e+uest

N5AP: adio Lin# 1eletion esponse

AL*AP: -I &-stablish e+uest)AL*AP: -*% &-stablish *on/rm)

ANAP: 1irect Transfer &**: Alerting)

*: 1ownlin# 1irect Transfer &**: Alerting)



UE RNCNodeB MGW/CN

*: * *onnection e+uest &A*)


N5AP: adio Lin# !etup esponseAL*AP: -I &-stablish e+uest)


*: * *onnection !etup &%A*)

L1 Syncroni!ation



*: (nitial 1irect Transfer &MM: Pa'in' Res(onse)!**P: * &*onnection e+uest)

ANAP: (nitial ,- Message &MM: Paging esponse)

!**P: ** &*onnection *on/rm)

ANAP: 1irect Transfer &MM: Authentication e+uest)

*: 1ownlin# 1irect Transfer &MM: Authentication e+uest)

*: ,plin# 1irect Transfer &MM: Authentication esponse)

ANAP: 1irect Transfer &MM: Authentication esponse)

ANAP: *ommon (1

ANAP: !ecurity Mode *ommand*: !ecurity Mode *ommand

%P: 1ownlin# !ynch

%P: ,plin# !ynch


L1 Syncroni!ation

'TC CS 'essage FlowANAP: Paging

*: Paging Type =



UE RNCNodeB MGW/CN


ANAP: !ecurity Mode *omplete

*: ,plin# 1irect Transfer &**: !etup)ANAP: 1irect Transfer &**: !etup)

ANAP: 1irect Transfer &**: *all *on/rmed)*: 1ownlin# 1irect Transfer &**: *all *on/rmed)

ANAP: A5 Assignment e+uest





N5AP: adio Lin# econ/guration *ommit)


*: adio 5earer !etup *ompleteANAP: A5 Assignment esponse



R)* +stablishment

%P: 1ownlin# !ynch

%P: ,plin# !ynch



4ossible ailure in )),!

setup 56ub1 6ur and 6u7

Sot hando8er is not allowed during the R)* establishment procedure 5The mobile can not add or remo8e cells in

)S7 this maes the 9+ and #ode * particularly sensiti8e to mobility and dominance Timer w:rb:setup:cpl 5%s7 is

started when the RRC. Radio *earer Setup message is sent to the 9+ 6n case the timer e;pires 6u Release Re<uest

is sent to the C# with release cause 5radio:conn:lost7



Call Esta"lised

UE RNCNodeB

ANAP: 1irect Transfer &**: *onnect)*: 1ownlin# 1irect Transfer &**: *onnect)

*: ,plin# 1irect Transfer &**: *onnect Ac#nowledge)

ANAP: 1irect Transfer &**: *onnect Ac#nowledge)

MGW/CN

ANAP: Location eport*: Measurement *ontrol

ANAP: 1irect Transfer &**: Alerting)*: 1ownlin# 1irect Transfer &**: Alerting)



,- Node5 N* !!N


N5AP: adio Lin# !etup esponse

AAL8!(: -I

AAL8!(: -*%


*: (nitial 1irect Transfer &MM: Attach e+uest)

ANAP: (nitial ,- Message MM: &Attach e+uest)

ANAP: 1irect Transfer &MM: P! (dentity e+uest)*: 1ownlin# 1irect Transfer &MM: P! (dentity e+uest)

*: ,plin# 1irect Transfer &MM: P! (dentity esponse)ANAP: 1irect Transfer &MM: P! (dentityesponse)ANAP: 1irect Transfer &MM: Authentication '

*iphering e+uest)

*: 1ownlin# 1irect Transfer &MM: Authentication ' *iphering e+uest)

*: ,plin# 1irect Transfer &MM: Authentication ' *iphering esponse)

ANAP: 1irect Transfer &MM: Authentication '*iphering esponse)

ANAP: !ecurity Mode*ommand*: !ecurity Mode *ommand


ANAP: !ecurity Mode*ompleteANAP: *ommon

'(C 4S 'essage Flow

L1 Syncroni!ation

*: * *onnection e+uest &A*)

%P: 1ownlin# !ynch%P: ,plin# !ynch



*: * *onnection !etup &%A*) JRRCconnRepTimer1/!1""ms#1s$K

N* chec#s if resources areavailable: 5T!0 A*0

Transmission.(f not it sends RRC

Connection Re&ect

L1 Syncroni!ation

1ata *all

Procedure



ANAP: 1irect Transfer &MM: AttachAccept)*: 1ownlin# 1irect Transfer &MM: Attach Accept)

*: ,plin# 1irect Transfer &MM: Attach *omplete)

ANAP: 1irect Transfer &MM: Attach*omplete)

*: ,plin# 1irect Transfer &!M: Activate P1P *onte>t e+uest)ANAP: 1irect Transfer&!M: Activate P1P *onte>t e+uest)

,- Node5 N* !!N'(C 4S 'essage Flow

N5AP: adio Lin# econ/guration *ommit

*: adio 5earer econ/guration

*: adio 5earer econ/guration *omplete




*: adio 5earer !etup *ompleteANAP: A5 Assignmentesponse

ANAP: 1irect Transfer

&!M: Activate P1P *onte>tAccept)*: 1ownlin# 1irect Transfer &!M: Activate P1P *onte>t Accept)

ANAP: A5 Assignmente+uest

*: Measurement *ontrol

*: Measurement epor &Tra/c $olume eports 7a)

AAL8!(:-IAAL8!(:

-*%

R)* +stablishmentSR* / CH 0=0



U(lin) * %o+nlin) %ata ,rans-er

&n'ication to transmit or recei(e 'ata



*: ,plin# 1irect Transfer &!M: 1eactivate P1P *onte>t e+uest)

ANAP: 1irect Transfer &!M: 1eactivateP1P *onte>t e+uest)ANAP: 1irect Transfer&!M: 1eactivate P1P *onte>tAccept)*: 1ownlin# 1irect Transfer &!M: 1eactivate P1P *onte>t Accept)

N5AP: adio Lin# econ/guration *ommit



AAL8!(:-IAAL8!(:-*%

*: adio 5earer elease

*: ,plin# 1irect Transfer &MM: 1etach e+uest) ANAP: 1irect Transfer &MM: 1etach e+uest)

ANAP: 1irect Transfer &MM: 1etachAccept)*: 1ownlin# 1irect Transfer &MM: 1etach Accept)

,- Node5 N* !!N

ANAP: (u elease *ommand

ANAP: (u elease*omplete

*: adio 5earer elease *omplete

*: * *onnection elease

*: * *onnection elease *omplete

N5AP: adio Lin# 1eletion e+uest

N5AP: adio Lin# 1eletion esponse

AAL8!(: -L &eleasee+uest)AAL8!(: *L &elease*on/rm)



'(C 4S 'essage Flow



9ser 4lane.

)CD*A

+1

e,-,

(oco'er

)CD*A

+1

AA+

FP

AT*

Ph.

*AC

R+C0

AA+

FP

AT*

Ph.

*AC

R+C0

AA+

AT*

Ph.

&u#cs

0P

AA+

AT*

Ph.

&u#cs

0P

e,-,

(oco'er

Ph. Ph. Ph.

+ink

+a.er

+ink

+a.er

A +aw

PC*#etc

A +aw

PC*#etc

PSTN

UE

Node B

RNC

Multimedia GW 3G MSC

Uu Iub Iu,cs A

R,C 4rotocol is a layer ! protocol that pro8ides a range o transport ser8ices between an

R,C entity in the 9+ and a peer R,C entity in the R#C> Segmentation and reassembly o

higher-layer 49s into=rom smaller R,C payload units1 +rror correction1 4rotocol error

detection and reco8ery

')C is a ,ayer ! protocol and it resides between 4hysical ,ayer 5,$7 and R,C> The

internal coniguration o ')C is done by the RRC layer 5,37> 'apping between logical

channels and transport channels1 Selection o appropriate Transport Format or each

Transport channel



Control 4lane.

)CD*A

+1

RRC

)CD*A

+1

AA+

FP

AT*

Ph.

*AC

R+CC

AA+

FP

AT*

Ph.

*AC

R+CC

UE

Node B

RNC

Uu Iub

RRC

The Radio Resource Control 5RRC7 protocol belongs to the 9'TS 2C') protocol stac

and handles the control plane signalling o ,ayer 3 between the 9+s 59ser +<uipment7

and the 9TR)#> Functions or connection esta2lishment an' release# 3roa'cast o s.stem

inormation# 4uter loop power control# Ra'io 2earer esta2lishment/reconi-uration an' release,



0ser Plane

Ph.sical +a.er

AA+

AT*

AA+5 AA+5

SSC4P

SSCF0N&

,15",

SSC4P

SSCF0N&

A+CAP ,67",1

N3AP Frame Protocol

Ra'io Network

Control Plane

Transport Network

Control Plane

6ub 4rotocol Stac.

The &u2 protocol stack has three planes

The ra'io network control plane uses the N3AP protocol an' completes tasks such as coni-urin- a

ra'io link at a No'e 3

The transport network control plane uses A+CAP an' is responsi2le or settin- up an' tearin- 'own

user plane transport 2earersThe user plane uses Frame Protocol an' is responsi2le or encapsulatin- all 'ata to an' rom the 08



6u-CS 4rotocol Stac.

0ser Plane

AA+

AT*

AA+5 AA+5

SSC4P

SSCFNN&

*TP72

SSC4P

SSCFNN&

,15",1

RANAP &u 0ser PlaneProtocol

Ra'io Network

Control Plane

Transport Network

Control Plane

*TP72

SCCP

,67",1

The &ucs protocol stack has three planes

The ra'io network control plane uses the RANAP protocol an' completes tasks such as coni-urin- a

RA3 or assi-nin- &ucs resources

The transport network control plane is responsi2le or settin- up an' tearin- 'own &u transport 2earersThe user plane is responsi2le or encapsulatin- all 'ata to an' rom the 08



irect Transer 'essages

There are three 'ierent t.pes o 'irect transer messa-e# two in the uplink an' one in the 'ownlink,

6nitial irect Transer 'essage

This is the messa-e use' to transer the irst si-nallin- initiation messa-e rom the NAS, This messa-e

tells the RNC a2out a re9uest or a new connection# which in turn inorms the CN that a new si-nallin-

connection is 2ein- set up, The inormation containe' in this is the NAS messa-e itsel# the 'omain the

si-nallin- connection is to 2e esta2lishe' an' somethin- known as the intra'omain NAS no'e selector#

which contains inormation a2out the core network no'e the messa-e is to 2e route' to, All this

inormation is utili:e' 2. the RNC to cause a successul connection to the re9ueste' 'omain,

9plin irect Transer 'essage

Ater the transmission o the initial 'irect transer messa-e# an. messa-e sent 2. the NAS in the uplink

or that 'omain will 2e sent in the uplink 'irect transer messa-e, This messa-e ;ust encapsulates the

NAS messa-e an' contains the 'omain or which the messa-e is meant,

ownlin irect Transer 'essage

The 'ownlink 'irect transer messa-e contains the NAS messa-e sent on the 'ownlink, This messa-e

also contains the 'omain rom which the messa-e has ori-inate' so that the messa-e can 2e route' to

the correct 'omain in the NAS in the 08,

http://wcdmaguide.blogspot.in/2010/10/direct-transfer-messages.html

http://wcdmaguide.blogspot.in/2010/10/direct-transfer-messages.html



Transmit power o irst pream2le < CP&C= transmit power !S&3 5$!77'3m$ > CP&C= RSCP !08

measure'$ ? 0plink RSS& !S&3 @$ ? PRAC= C/& re9uirement !S&3 5$The CP&C= 8c/&o can 2e etracte' rom the &8 usin-B

8c/&o < ? &8 / DR c.cle len-th < k ramesDPCC= power oset < '3# !actual (alue < &8 $ use' or the uplink open loop power control

!&nitial 08 T power < CP&C= RSCP$

Cell Selection. 3oth S9ual an' Srle( must 2e positi(e or the 08 to camp upon the cell

S9ual < 9ualmeas > QqualMin !(alue in S&3 7$

Srle(

< rle(meas

> Qrle!Min > Pcompensation

where# Pcompensation

< *a!UE"#$%WR"MA$"RAC& > PE*A# "$

Deault (aluesBQqualMin is >" '3 CP&C= 8c/&o

Qrle!Min is >115 '3m CP&C= RSCP

Call Flow UMTS v2

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