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CWTS-STD-DS-23.108 V5.0.0 (2002-06)Technical Specification

3rd Generation Partnership Project;Technical Specification Group Core Network (CN);

Mobile radio interface laer 3 specification!Core network protocols " Sta#e $

(%elease &)

%elease &

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2/343GPP

KeywordsUMTS, network, stage 2

CWTS

Internet

tt!"##www.$wts.org

Copyright Notification

No part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in

all media.

2002 !"## $rganizational #artners %&'I( )*T+ ,T+I T- TT& TT).&ll rights reser/ed.

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%orewor&This Technical +pecification %T+ has been produced by the ! rd"eneration #artnership #roAect %!"##.

The present document specifies the procedures used at the radio interface core networ8 protocols within the !rd

generation mobile telecommunications system and the digital cellular telecommunications system.

The contents of the present document are subAect to continuing wor8 within the T+" and may change following formalT+" appro/al. +hould the T+" modify the contents of the present document it will be re;released by the T+" with anidentifying change of release date and an increase in /ersion number as followsB

7ersion x.y.z

whereB

x the first digitB

- presented to T+" for informationC

2 presented to T+" for appro/alC

! or greater indicates T+" appro/ed document under change control.

y the second digit is incremented for all changes of substance i.e. technical enhancements correctionsupdates etc.

z the third digit is incremented when editorial only changes ha/e been incorporated in the document.

'ntro&$tonThe present document includes references to features which are not part of the #hase 2D 'elease ?4 of the "+:Technical specifications. &ll subclauses which were changed as a result of these features contain a mar8er %see table

below rele/ant to the particular feature.

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1 S$o!eThe present document specifies the procedures used at the radio interface %'eference #oint 3m see !"## T+ 21.002for )all )ontrol %)) :obility :anagement %:: and +ession :anagement %+:.

*hen the notations for Efurther studyE or E+E or E+E are present in the present document they mean that theindicated text is not a normati/e portion of this standard.

These procedures are defined in terms of messages exchanged o/er the control channels of the radio interface. Thecontrol channels are described in !"## T+ 11.00!.

The structured functions and procedures of this protocol and the relationship with other layers and entities are describedin general terms in !"## T+ 21.006.

1.1 S$o!e o* te Te$n$a+ S!e$*$aton

The procedures currently described in the present document are for the call control of circuit;switched connections

session management for "#'+ ser/ices mobility management and radio resource management for circuit;switched and"#'+ ser/ices.

!"## T+ 21.0-0 contains functional procedures for support of supplementary ser/ices.

!"## T+ 21.0-- contains functional procedures for support of point;to;point short message ser/ices.

!"## T+ 21.0-2 contains functional description of short message ; cell broadcast.

!"## T+ 11.040 contains procedures for radio lin8 control and medium access control %'5)F:&) of pac8et dataphysical channels.

!"## T+ 11.0-> contains the procedures for the '' protocol.

!"## T+ 21.00> contains the procedures for the )N protocols.

!"## T+ 11.06- contains functional descriptions and procedures for support of location ser/ices.

N$T,B Elayer !E includes the functions and protocols described in this Technical +pecification. The terms Edatalin8 layerE and Elayer 2E are used interchangeably to refer to the layer immediately below layer !.

1.2 !!+$aton to te nter*a$e str$tres

The layer ! procedures apply to the interface structures defined in !"## T+ 11.00!. They use the functions and ser/icespro/ided by layer 2 defined in !"## T+ 11.00 and !"## T+ 11.004. !"## T+ 21.006 gi/es the general description oflayer ! including procedures messages format and error handling.

1.3 Str$tre o* +aer 3 !ro$e&res

& building bloc8 method is used to describe the layer ! procedures.

The basic building bloc8s are Eelementary proceduresE pro/ided by the protocol control entities of the three sublayersi.e. radio resource management mobility management and connection management sublayer.

)omplete layer ! transactions consist of specific se

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1.5 Use o* +og$a+ $anne+s

The logical control channels are defined in !"## T+ 1.002. In the following those control channels are consideredwhich carry signalling information or specific types of user pac8et informationB

i (roadcast )ontrol )=annel %())=B downlin8 only used to broadcast )ell specific informationC

ii +ynchronization )=annel %+)=B downlin8 only used to broadcast synchronization and (++ identificationinformationC

iii #aging )=annel %#)=B downlin8 only used to send page re

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; I:+I attach procedure %subclause 1.1.!C

; generic location updating procedure %subclause 1.1C

; connection management sublayer ser/ice pro/isionC

; mobility management connection establishment %subclause 1..-C

; mobility management connection information transfer phase %subclause 1..2C

; mobility management connection release %subclause 1..!C

; "#'+ specific mobility management procedures %subclause 1.6C

; "#'+ attach procedure %subclause 1.6.!C

; "#'+ detach procedure %subclause 1.6.1C

; "#'+ routing area updating procedure %subclause 1.6.C

; "#'+ common mobility management procedures %subclause 1.6C

; "#'+ #;T:+I reallocation procedure %subclause 1.6.4C

; "#'+ authentication and ciphering procedure %subclause 1.6.6C

; "#'+ identification procedure %subclause 1.6.>C

; "#'+ information procedure %subclause 1.6.-2C

b )lause specifies elementary procedures for circuit switched )all )ontrol comprising the following elementaryproceduresB

; mobile originating call establishment %subclause .2.-C

; mobile terminating call establishment %subclause .2.2C

; signalling procedures during the acti/e state %subclause .!C

; user notification procedure %subclause .!.-C

; call rearrangements %subclause .!.2C

; 9T: protocol control procedure %subclause ..6C

; in;call modification %subclause .!.1C

; call clearing initiated by the mobile station %subclause .1.!C

; call clearing initiated by the networ8 %subclause .1.1C

; miscellaneous proceduresC

; in;band tones and announcements %subclause ..-C

; status en

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; anonymous #9# context deacti/ation %subclause 4.-..

The elementary procedures can be combined to form structured procedures. ,xamples of such structured procedures aregi/en in clause 6. This part of the Technical +pecification is only pro/ided for guidance to assist implementations.

)lause > specifies actions to be ta8en on /arious error conditions and also pro/ides rules to ensure compatibility withfuture enhancements of the protocol.

1. !!+$a+t o* 4!+e4entatons

The applicability of procedures of this technical specification for the mobile station is dependent on the ser/ices andfunctions which are to be supported by a mobile station.

1..1 Vo$e ro! Ca++ Ser$e (VCS) an& Vo$e roa&$ast Ser$e (VS)

or mobile stations supporting the 7oice "roup )all +er/ice or the 7oice (roadcast +er/ice it is explicitly mentionedthroughout this technical specification if a certain procedure is applicable only for such a ser/ice and if necessary howmobile stations not supporting such a ser/ice shall beha/e.

or 7")+ and 7(+ the following possible mobile station implementations existB

; support of listening to /oice broadcast calls %7(+ listeningC

; support of originating a /oice broadcast call %7(+ originatingC

; support of listening to /oice group calls %7")+ listeningC

; support of tal8ing in /oice group calls %7")+ tal8ing. This always includes the implementation for 7")+listeningC

; support of originating a /oice group call %7")+ originating. This always includes the implementation for 7")+tal8ing.

&part from the explicitly mentioned combinations all possible combinations are optional and supported by thistechnical specification.

The related terms are used in this technical specification if information on these implementation options is re

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2 e*eren$esThe following documents contain pro/isions which through reference in this text constitute pro/isions of the presentdocument.

'eferences are either specific %identified by date of publication edition number /ersion number etc. or

non;specific.

or a specific reference subse

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G1?H IT3;T 'ecommendation I.110 %-?>?B EI+9N user;networ8 interface data lin8 layer ; "eneralaspectsE.

G0H IT3;T 'ecommendation I.10 %-?>?B EI+9N user;networ8 interface layer ! "eneral aspectsE.

G-H IT3;T 'ecommendation I.00 %-??!B E"eneral structure of the I+9N interwor8ingrecommendationsE.

G2H IT3;T 'ecommendation T.0B EInternational 'eference &lphabet %I'& %ormerly International&lphabet No. or I& ; Information technology ; 6;bit coded character set for informationinterchangeE.

G!H IT3 'ecommendation L.?!-B I+9N user;networ8 interface layer ! specification for basic controlE.

G1H IT3;T 'ecommendation 7.2-B E!00 bits per second duplex modem standardized for use in thegeneral switched telephone networ8E.

GH IT3;T 'ecommendation 7.22B E-200 bits per second duplex modem standardized for use in thegeneral switched telephone networ8 and on point;to;point 2;wire leased telephone;type circuitsE.

G4H IT3;T 'ecommendation 7.22bisB E2100 bits per second duplex modem using the fre

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G6!H !"## T+ 22.040B E"eneral #ac8et 'adio +er/ice %"#'+C +er/ice 9escriptionC +tage -E.

G61H !"## T+ 2!.040B E"eneral #ac8et 'adio +er/ice %"#'+C +er/ice 9escriptionC +tage 2E.

G6H !"## T+ 1!.041B E"eneral #ac8et 'adio +er/ice %"#'+C $/erall description of the "#'+ radiointerfaceC +tage 2E.

G64H !"## T+ 11.040B E"eneral #ac8et 'adio +er/ice %"#'+C :obile +tation %:+ ; (ase +tation+ystem %(++ interfaceC 'adio 5in8 )ontrolF:edium &ccess )ontrol %'5)F:&) protocolE.

G66H I,T ') -0!1B E9omain names ; concepts and facilities E.

G6>H !"## T+ 11.04B E:obile +tation %:+ ; +er/ing "#'+ +upport Node %+"+NC +ubnetwor89ependent )on/ergence #rotocol %+N9)#E.

G6?H !"## T+ 2!.-!B E:ulticall supplementary ser/ice ; +tage 2E.

G>0H !"## T+ 11.0->B E:obile radio interface layer ! specificationC 'adio 'esource )ontrol #rotocolE.

2.1 De*ntons an& areatons

or the purposes of the present document the abbre/iations defined in !"## T' 2-.?0 G2aH apply.

2.1.1 an&o4 a+es

or the '' protocol see !"## T+ 11.0-> and for the )N protocols see !"## T+ 21.00>.

2.2.2 Vo$a+ar

or the '' protocol see !"## T+ 11.0-> and for the )N protocols see !"## T+ 21.00>.

3 a&o esor$e 4anage4ent !ro$e&res+ee !"## T+ 11.0->.

9+e4entar !ro$e&res *or Mo+t Manage4ent+ee !"## T+ 21.00>.

5 9+e4entar !ro$e&res *or $r$t-swt$e& Ca++Contro++ee !"## T+ 21.00>.

6 S!!ort *or !a$ket ser$es+ee !"## T+ 21.00>.

9:a4!+es o* str$tre& !ro$e&res)lause 6 is informati/e.

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.1 enera+

)lause 6 contains examples of how the networ8 may group together the elementary procedures %i.e. the proceduresdefined in clauses ! to in order to pro/ide normal ser/ice.

The layer ! signalling at the radio interface may be di/ided into so;called structured procedures which consist of

specific combinations of elementary procedures. In subclause 6.! selected examples of structured procedures aredescribed. & structured procedure consists of %not necessarily all components shown in figure 6.-. These componentsare characterized by the purpose of their use in structured procedures and their message flow in the followingsubclauses 6.-.- to 6.-.6.

+- -+ Paging request RR connection Immediate assignment establishment

+- -++- -+ Service request and Contention resolution +- -++- -+ Authentication +- -+

+- -+ Ciphering mode setting +- -++- -+ Transaction phase +- -++- -+

Channel release RR connection+- -+ release

2i#ure 0*3GPP TS $3*+,4 Co5ponents of structured procedures

.1.1 7agng re;est

The paging procedure is used to locate a mobile station to which a connection shall be established.

3pon receipt of a #&"IN" ',L3,+T message the addressed mobile station initiates the immediate assignmentprocedure.

Mobile Station et!or"

PA#I# R$%&$ST'-------------------

2i#ure 0$3GPP TS $3*+,4 Pa#in# re6uest

.1.2 '44e&ate assgn4ent

The immediate assignment procedure is always initiated by the mobile station. It may be triggered by a paging re

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.1.3 Ser$e re;est an& $ontenton reso+ton

The initial ser/ice re

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+- -+ C(A$) R$%&$ST RR connection ---------------------------------------* establishment M/. IMM$IAT$ ASSI#M$T '-------------------------------------- +- -++- -+ )/CATI/ &PATI# R$%&$ST ----------------------------------------* Service request +- -++- -+ A&T($TICATI/ R$%&$ST '--------------------------------------- Authentication

A&T($TICATI/ R$SP/S$ ----------------------------------------* +- -++- -+ CIP($R M/$ C/MMA '--------------------------------------- Ciphering mode setting CIP($R M/$ C/MP)$T$ -----------------------------------------*+- -++- -+ )/CATI/ &PATI# ACC$PT '--------------------------------------- TMSI R$A))/CATI/ C/MP)$T$ ---------------------------------------* +- -++- -+ C(A$) R$)$AS$ RR connection '--------------------------------------- release +- -+

2i#ure 013GPP TS $3*+,4 :ocation updatin#4 successful case

.3.2 Mo+e orgnatng $a++ esta+s4ent

The mobile station initiates immediate assignment ser/ice re %if the ringing tone will be sent by the remoteend in the &5,'TIN" message. In that case an alerting ringing tone has to be generated by the networ8.

N$T,B The speech codec is transparent for super/isory tones.

& )$NN,)T message and its ac8nowledgement )$NN,)T &)KN$*5,9", complete the callestablishment when the called party has answered.

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The mobile originating call setup with early assignment is shown in figure 6.-0aF!"## T+ 2!.-0>.

b $&)+3 option %late assignmentB

The networ8 determines when the traffic channel is to be assigned. The assignment may be performed at anytime after call establishment has been initiated in the fixed networ8. In the following the case is consideredwhere the networ8 will only allocate a traffic channel after the called party has answered the call %late

assignment.

&s in a an &5,'TIN" message is sent to the mobile station when user alerting has been initiated at the calledside. If the ringing tone is needed it has to be generated locally at the mobile station as no traffic channel isallocated. *hen the called party has answered the networ8 will initiate the channel assignment procedure inorder to allocate a traffic channel to the mobile station. If call .

c 7ery early assignmentB

The networ8 assigns the traffic channel at the earliest possible moment i.e. in the immediate assignmentprocedure. The mode of the traffic channel is changed from signalling only to the mode necessary for the call bymeans of the channel mode change procedure. &n appropriate moment for that change is after the networ8 hassent the )&55 #'$),,9IN" message when the call is established towards the called user.

*ith this option call

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+- -+ C(A$) R$%&$ST RR connection -------------------------* establishment IMM$IAT$ ASSI#M$T M/. '------------------------

+- -++- -+ Service indication CM S$R5IC$ R$%&$ST -------------------------* +- -++- -+ A&T($TICATI/ R$%&$ST Authentication '------------------------- A&T($TICATI/ R$SP/S$ --------------------------* +- -++- -+ CIP($R M/$ C/MMA '------------------------- Ciphering CIP($R M/$ C/MP)$T$ mode setting --------------------------* +- -++- -+ S$T&P --------------------------* Call initiation CA)) PR/C$$I# '------------------------- +- -++- -+ A)$RTI# '-------------------------- &ser alerting+- -++- -+ ASSI#M$T C/MMA '------------------------- Assignment o6 ASSI#M$T C/MP)$T$ a tra66ic

--------------------------* channel+- -++- -+ C/$CT '-------------------------- Call accepted C/$CT AC2/3)$#$ --------------------------* +- -+

2i#ure 0*+b3GPP TS $3*+,4 Mobile ori#inatin# call establish5ent with 9CS< (late assi#n5ent)

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Mobile Station et!or"+- -+ C(A$) R$%&$ST RR connection --------------------------* establishment IMM$IAT$ ASSI#M$TTC(. M/. '-------------------------

+- -++- -+ CM S$R5IC$ R$%&$ST --------------------------* Service request +- -++- -+ A&T(entication R$%uest Authentication '-------------------------- A&T($TICATI/ R$SP/S$ ---------------------------* +- -++- -+ CIP($R M/$ C/MMA '-------------------------- Ciphering CIP(er M/e C/Mplete mode setting ---------------------------*

+- -++- -+ S$T&P --------------------------* Call initiation CA)) PR/Ceeding '-------------------------- +- -++- -+ C(A$) M/$ M/I01 '--------------------------- Transmission C(A$) M/$ M/I01 AC2/3)$#$ mode ---------------------------* change+- -++- -+ A)$RTI# '---------------------------- &ser alerting

+- -++- -+ C/ect '--------------------------- Call accepted C/ect AC2no!ledge ---------------------------* +- -+

2i#ure 0*+c3GPP TS $3*+,4 Mobile ori#inatin# call establish5ent with 8er earl assi#n5ent

.3.3 Mo+e ter4natng $a++ esta+s4ent

:obile terminating call establishment is initiated by the networ8 sending a #&"IN" ',L3,+T message %seefigure 6.--aF!"## T+ 2!.-0>. 3pon recei/ing this message the mobile station initiates the immediate assignment

procedure and responds to the networ8 by sending the #&"IN" ',+#$N+, message within a layer 2 +&(: frame.The networ8 returns a layer 2 3& frame containing the same information field as was sent in the +&(: frame.

&uthentication and ciphering are treated by the networ8 in the same way as defined for the mobile originating callestablishment %subclause 6.!.2. &fter ciphering has been started the networ8 sends a +,T3# message to the mobilestation. The capability of the mobile station %at that time to accept the call is confirmed when the mobile station returnsa )&55 )$NI':,9 message to the networ8.

a Non;$&)+3 option %early assignmentB

*ith this option the networ8 initiates the assignment of a traffic channel upon recei/ing the )&55)$NI':,9 message.

The signal I, is not included in the +,T3# message therefore user alerting is initiated only after a traffic

channel has been allocated. &n &5,'TIN" message will be sent to the networ8.

*hen the called user answers the mobile station sends a )$NN,)T message to the networ8. 3pon recei/ingthe )$NN,)T message the networ8 completes the through connection of the communication path and sends a)$NN,)T &)K message to the mobile station.

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b $&)+3 option %late assignmentB

In that option the signalling I, is included in the +,T3# message. )onse

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; a waiting call exists and the mobile station does not indicates to the networ8 which bearer will be used foraccepting the waiting call yetC and

; there exists no retained bearer for the waiting call.

*hen the mobile station recei/es +,T3# message with +ignal I, indicating )all *aiting which means thenetwor8 cannot pro/ide any additional traffic channel thenB

; the :+ shall not re

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+- -+ RR connection established +- -+

+- -+ handover (A/5$R C/MMA old channel9 '------------------------ old cell-- - - - - - - - - - - - - --- - - - - - - - - - (A/5$R ACC$SS ne! channel9 ------------------------* ne! cell (A/5$R ACC$SS ------------------------* (A/5$R ACC$SS ------------------------* (A/5$R ACC$SS ------------------------* (A/5$R C/MP)$T$

------------------------*+- -+

2i#ure 0*/3GPP TS $3*+,4 =ando8er to a finel snchroni>ed cell! successful case


+- -+ RR connection established +- -++- -+ handover (A/5$R C/MMA old channel9 '------------------------ old cell-- - - - - - - - - - - - - --- - - - - - - - - - (A/5$R ACC$SS ne! channel9 ------------------------* ne! cell 7 7 7 (A/5$R ACC$SS ne! channel9 ------------------------* ne! cell P(1SICA) I0/RMATI/ '----------------------- (A/5$R C/MP)$T$ ------------------------*+- -++- -+ 7

7 7 +- -+

2i#ure 0*&3GPP TS $3*+,4 =ando8er to a non"snchroni>ed cell! successful case

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+- -+ RR connection established +- -+

+- -+ handover (A/5$R C/MMA old channel9 '------------------------ old cell-- - - - - - - - - - - - - -- - - - - - - - T:;pir? or ne! channel9 lo!er la?er 6ailure ne! cell-- - - - - - - - - - - - - -- - - - - - - - - (A/5$R 0AI)&R$ old channel9 ------------------------* old cell+- -++- -+ 7 7 7 +- -+

2i#ure 0*.3GPP TS $3*+,4 =ando8er failure! reconnection to the old traffic channel

.3. 'n-$a++ 4o&*$aton

igure 6.-6F!"## T+ 2!.-0> shows the structured procedure for in;call modification.


+- -+ active call +- -+ 7+- -+ M/I01 ------------------------------* in-call modi6ication e7g7 6rom speech to data+- -+ channel mode modi6? +- -+ M/I01 C/MP)$T$ '----------------------------- +- -++- -+

active call +- -+

2i#ure 0*03GPP TS $3*+,4 7n"call 5odification

.3.8 Ca++ re-esta+s4ent

igure 6.->F!"## T+ 2!.-0> shows the structured procedure for call re;establishment.

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+- -+ active call +- -+-------------------------------------- radio lin" 6ailure

+- -+ C(A$) R$%&$ST RR connection -------------------------* establishment IMM$IAT$ ASSI#M$T M/. '------------------------ +- -++- -+ CM R$-$STA,)IS(M$T R$%&$ST -------------------------* Service request+- -++- -+ CIP(er M/e C/MMA '------------------------- Ciphering CIP($R M/$ C/MP)$T$ mode setting -------------------------* +- -++- -+ ASSI#M$T C/MMA '------------------------- assignment o6 ASSI#M$T C/MP)$T$ a tra66ic channel -------------------------* +- -++- -+ active call +- -+

2i#ure 0*,3GPP TS $3*+,4 Call re"establish5ent

.3.= >etwork ntate& 4o+e orgnatng $a++ ?(CCS)?

Networ8 initiated mobile originating call establishment %which is used for example for ))(+ +er/ice is initiated bythe networ8 sending a #&"IN" ',L3,+T message. 3pon recei/ing this message the mobile station initiates theimmediate assignment procedure and responds to the networ8 by sending the #&"IN" ',+#$N+, message within alayer 2 +&(: frame. The networ8 returns a layer 2 3& frame containing the same information field as was sent in the+&(: frame.

&uthentication and ciphering are treated by the networ8 in the same way as defined for the mobile originating callestablishment %subclause 6.!.2. &fter ciphering has been started the networ8 sends a ): +,'7I), #'$:#Tmessage indicating that the ): protocol is to be started to the mobile station. The basic capability of the mobilestation to accept any form of recall ser/ice is confirmed when the mobile station returns a +T&'T )) message to thenetwor8.

a assignment before & party alertingB

*ith this option the networ8 allocates a traffic channel to the mobile station before the mobile station alerts itsuser.

The networ8 responds to the +T&'T )) message with a ));,+T&(5I+=:,NT message. The :+ answerswith a ));,+T&(5I+=:,NT )$NI':,9 message indicating the wanted channel characteristics. Thenetwor8 then initiates traffic channel assignment.

*hen the traffic channel has been assigned the networ8 indicates a pending recall by sending a ',)&55message.

If the calling user accepts the recall a +,T3# message is sent to the networ8. The networ8 responds with a)&55 #'$),,9IN" message and initiates call establishment in the fixed networ8.

*hen user alerting has been initiated at the called side an &5,'TIN" message is sent to the mobile station. Thenetwor8 may optionally instruct the :+ to attach the user connection at this stage of the call by means of theprogress indicator information element set to the /alue M- or M>%if the ringing tone will be sent by the remoteend in the &5,'TIN" message. In that case an alerting ringing tone has to be generated by the networ8.

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N$T, -B The speech codec is transparent for super/isory tones.


The networ8 initiated mobile originating call establishment with assignment before & part alerting is shown infigure 6.-?F!"## T+ 2!.-0>.

b assignment before ( party alertingB

*ith this option the networ8 allocates a traffic channel to the mobile station after the mobile station has alertedits user and after its user has accepted the recall but before the networ8 initiates call establishment in the fixednetwor8.

The networ8 responds to the +T&'T )) message with a ));,+T&(5I+=:,NT message. The :+ answerswith a ));,+T&(5I+=:,NT )$NI':,9 message indicating the wanted channel characteristics.

The networ8 indicates a pending recall by sending a ',)&55 message. If the calling user accepts the recall a+,T3# message is sent to the networ8. The networ8 responds with a )&55 #'$),,9IN" message andinitiates traffic channel assignment.

*hen the traffic channel has been assigned the networ8 initiates call establishment in the fixed networ8.

*hen user alerting has been initiated at the called side an &5,'TIN" message is sent to the mobile station. Thenetwor8 may optionally instruct the :+ to attach the user connection at this stage of the call by means of the

progress indicator information element set to the /alue M- or M>%if the ringing tone will be sent by the remoteend in the &5,'TIN" message. In that case an alerting ringing tone has to be generated by the networ8.

N$T, 2B The speech codec is transparent for super/isory tones.


The networ8 initiated mobile originating call establishment with assignment before ( party alerting is shown infigure 6.20F!"## T+ 2!.-0>.

c assignment after & and ( party alerting

*ith this option the networ8 determines when the traffic channel is to be assigned. The assignment may beperformed at any time after call establishment has been initiated in the fixed networ8. In the following the caseis considered where the networ8 will only allocate a traffic channel after the called party has answered the call%late assignment.

The networ8 responds to the +T&'T )) message with a ));,+T&(5I+=:,NT. The :+ answers with a ));,+T&(5I+=:,NT )$NI':,9 message indicating the wanted channel characteristics.

The networ8 indicates a pending recall by sending a ',)&55 message. If the calling user accepts the recall a+,T3# message is sent to the networ8. The networ8 responds with a )&55 #'$),,9IN" message andinitiates call establishment in the fixed networ8.

&s in a and b an &5,'TIN" message is sent to the mobile station when user alerting has been initiated at thecalled side. If the ringing tone is needed it has to be generated locally at the mobile station as no traffic channelis allocated. *hen the called party has answered the networ8 will initiate the channel assignment procedure inorder to allocate a traffic channel to the mobile station. $nce the channel assignment has been completed thenetwor8 will send a )$NN,)T message to the mobile station. The :+ attaches then the user connection. The)$NN,)T &)KN$*5,9", message will complete the call setup.

The networ8 initiated mobile originating call establishment with assignment after & and ( party alerting isshown in figure 6.2-F!"## T+ 2!.-0>.

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+- -+ PA#I# R$%&$ST '------------------------- C(A$) R$%&$ST RR connection -------------------------* establishment IMM$IAT$ ASSI#M$T MT.

'------------------------- +- -++- -+ PA#I# R$SP/S$ -------------------------* +- -++- -+ A&T($TICATI/ R$%&$ST Authentication '------------------------- A&T($TICATI/ R$SP/S$ -------------------------* +- -++- -+ CIP(er M/e C/MMA '------------------------- Ciphering CIP($R M/$ C/MP)$T$ mode setting -------------------------*

+- -++- -+ CM S$R5IC$ PR/MPT '------------------------- Service Request START CC -------------------------* +- -++- -+ CC-$STA,)IS(M$T '-------------------------@ Recall initiation CC-$STA,)IS(M$T C/0IRM$ -------------------------* +- -++- -+ ASSI#M$T C/MMA '------------------------- Assignment o6

ASSI#M$T C/MP)$T$ a tra66ic channel7 -------------------------* +- -++- -+ R$CA)) '------------------------- &ser noti6ied about recall S$T&P -------------------------* Recall accepted and CA)) PR/C$$I# call initiation '------------------------- +- -++- -+ A)$RTI# '------------------------- Called user alerting+- -+ in6ormation+- -+ C/$CT

'------------------------- Call accepted C/$CT AC2/3)$#$ -------------------------* +- -+

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2i#ure 0*13GPP TS $3*+,4 Network initiated 5obile ori#inatin# call establish5ent with assi#n5entbefore 9 part alertin#

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+- -+ PA#I# R$%&$ST '------------------------- C(A$) R$%&$ST RR connection -------------------------* establishment

IMM$IAT$ ASSI#M$T MT. '------------------------- +- -++- -+ PA#I# R$SP/S$ -------------------------* +- -++- -+ A&T($TICATI/ R$%&$ST Authentication '------------------------- A&T($TICATI/ R$SP/S$ -------------------------* +- -++- -+ CIP(er M/e C/MMA '------------------------- Ciphering CIP($R M/$ C/MP)$T$ mode setting

-------------------------* +- -++- -+ CM S$R5IC$ PR/MPT '------------------------- Service Request START CC -------------------------* +- -++- -+ CC-$STA,)IS(M$T '-------------------------@ Recall initiation CC-$STA,)IS(M$T C/0IRM$ -------------------------* +- -++- -+ R$CA))

'------------------------- &ser noti6ied about recall S$T&P -------------------------* Recall accepted and CA)) PR/C$$I# call initiation '------------------------- +- -++- -+ ASSI#M$T C/MMA '------------------------- Assignment o6 ASSI#M$T C/MP)$T$ a tra66ic -------------------------* channel+- -++- -+ A)$RTI# '------------------------- Called user alerting+- -+ in6ormation+- -+

C/$CT '------------------------- Call accepted C/$CT AC2/3)$#$ -------------------------* +- -+

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2i#ure 0$+3GPP TS $3*+,4 Network initiated 5obile ori#inatin# call establish5ent with assi#n5entbefore ? part alertin#

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