07-mobile originating call establishment procedure

8/20/2019 07-Mobile Originating Call Establishment Procedure

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第2 章 Signaling Analysis Manual第3 章 M900/M1800 Base StationSubsystem

4章 Chapter 75章 Mobile Originating Call Establishment

Proe!ure

6章

Chapter 7 Mobile Originating Call Establishment

Procedure

7.1 Oerie!

Mobile originating all ser"ies inlu!e #not inlu!ing mobile$originate! SMS%

MS alls MS

MS alls &i'e! telephone

7.2 "ormal Procedure

As per assignment type( the mobile originating all establishment proe!ure an be

lassi&ie! into ) types( early assignment( late assignment an! "ery early assignment*

+he seletion o& early assignment an! late assignment is !etermine! by MSC* +he

seletion o& "ery early assignment is !etermine! by BSS as per the status o& ra!io

resoures*

7.2.1 Mobile Originating Call Establishment !ithout O#C$% &Earl'

#ssignment(

"ote)

OACSU denotes "Off-Air-Call-Set-Up".

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Proe!ure

6章*. $ignaling procedure

1*

Channel AC+ #)%

Channel AC+ AC, #-%

.MM ASS CM/ #%

B+S BSC MSCMS

Channel E2 #1%

SABM #3%

ES+ .4/ #CM Ser"ie E2% #8%C #CMP 5) in&ormation% #9%

CC #10%

Setup #16%

Call Proceeding #1)%

ASS E2 #1-%

ASS CM/ #17%

SABM #18%

ES+ .4/ #60%

ASS CMP #61%

ASS CMP #66%

Alerting #6)%

Connect #6-%

Connect ACK #6%

+aling #63%

DISC #67%

REL

REL CMP

Clear CM/ #)0%

Clear CMP #)8%

CM Service Accepted #11%

Channel AC+ #1%

Channel AC+ AC, #13%

A #19%

A #7%

Channel E5 #)1%

E5 .4/ #)%

/eati"e SACC #)-%

: Channel E5 #)3%

: Channel E5 AC, #)7%

/.SC #)6%

A #))%

5S/ #)9%

5S/ CMP #-0%

#68%

#69%

Channel 2/ #6%

Figure 1.1

第1 章 6


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Proe!ure

6章

1% MS sen!s a CA44E5 E2ES+ message to B+S on the aess hannel

#AC% o& m inter&ae* +he message ontains the ause "alue ;MOC;( but that

"alue is not ompletely aurate( beause it is in!iate! both in the mobile

originating all establishment proe!ure an! .MS. !etah proe!ure*

6% B+S sen!s a CA44E5 E2.E message to BSC*

)% pon reeipt o& the CA44E5 E2.E message( BSC alloates a signaling

hannel an! sen!s a CA44E5 AC+.


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Proe!ure

6章18% MS sen!s an SABM &rame to B+S( to aess the net=or on :ACC in!iate! in

the ASS.?4ME4+ COMMA4 message*

19% B+S sen!s a A &rame &or ano=le!gement on :ACC*

60% B+S sen!s an ES+AB5.SME4+ .4.CA+.O4 message to BSC*

61% A&ter aessing the +C( MS sen!s an ASS.?4ME4+ COMP5E+E message to

BSC on :ACC*

66% A&ter the ra!io tra&&i hannel an! terrestrial iruit are both suess&ully

onnete!( BSC sen!s an ASS.?4ME4+ COMP5E+E message to MSC( an!

regar!s this all in session state*

6)% MSC sen!s an A5+E.4? message to the alling MS* +he alling MS =ill hear

the ringba* +he message is sent on :ACC on m inter&ae*6-% MSC sen!s a CO44EC+ message to MS* +he message is sent on :ACC on

m inter&ae*

6% +he alling MS returns a CO44EC+ AC,4O>5E?E message on :ACC to

MSC*

63% +he alling MS an! alle! MS enters the session state*

67% A&ter the on"ersation is o"er( the alling MS hangs up an! sen!s a

.SCO44EC+ message on :ACC*

68% MSC sen!s a E5EASE message to MS* +he message is sent on :ACC on

m inter&ae*

69% MS returns a E5EASE COMP5E+E message* +he message is sent on :ACC

on m inter&ae*

)0% MSC sen!s a C5EA COMMA4 message to BSC* pon reeipt o& the

message( BSC initiates the release proe!ure* See Chapter &or the !esription

o& the subseuent release proe!ure*

)1% BSC sen!s a CA44E5 E5EASE message to MS through B+S( +he message

is sent on :ACC on m inter&ae*

)6% MS sen!s .SC &rame on :ACC*

))% B+S returns A &rame on :ACC*

**. Procedure e+planation

1% .n Error e&erene soure not &oun!( 18 re&er to the ran!om aess proe!ure

an! imme!iate assignment proe!ure* .n the t=o proe!ures( BSS alloates

signaling hannels to MS*

6% Bet=een 1011( there may e'ist an authentiation proe!ure( iphering mo!e

setting proe!ure an! lassmar interrogation proe!ure #up!ating proe!ure%*

)% As per !i&&erent !ata on&iguration o& MSC( a&ter the lin onnetion is

establishe! on A inter&ae( MSC may not imme!iately !eli"er the CM SE


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Proe!ure

6章-% .nitiate the iphering mo!e setting proe!ure by !eli"ering a Cipher Mo!e

Comman! #.n that ase( MSC shall not !eli"er the CM Ser"ie Aepte!

message again%*

% .nitiate the authentiation proe!ure by !eli"ering an A+E4+.CA+.O4

E2ES+ message*

3% .nitiate the lassmar up!ating proe!ure by !eli"ering a C5ASSMA, PA+E

message*

7% .n a!!ition( i& DECSC in BSC !ata on&iguration is set to ;Fes;( the !ual$ban! MS

shall report a C5ASSMA, CA4?E message a&ter it reports an

ES+AB5.SME4+ .4.CA+.O4 message*

8% 1-66 re&er to the +C assignment proe!ure*

.n this proe!ure( BSS alloates the resoures suh as +Cs( A inter&ae iruit( et*

to MS*

9% )0-0 re&er to the release proe!ure*

+he proe!ure sho=n in Error e&erene soure not &oun! is a release proe!ure in

=hih the alling MS &irst hangs up* +he logial hannels on m inter&ae are

release! prior to the physial hannels*

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Proe!ure

6章7.2.2 Mobile Originating Call Establishment !ith O#C$% &,ate #ssignment(

*. $ignaling procedure

6*

Channel AC+

Channel AC+ AC,

.MM ASS CM/

B+S BSC MSCMS

Channel E2

SABM

ES+ .4/# CM Ser"ie E2%C#CMP 5) in&ormation%

CC

Setup

Call Proceeding

ASS E2

ASS CM/

SABM#18%

ES+ .4/

ASS CMP ASS CMP

Alerting

Connect

Connect ACK

+aling #6%

DISC

REL

REL CMP

Clear CM/

Clear CMP

CM Service Accepted

Channel AC+ #1%

Channel AC+ AC, #13%

A

A

Channel E5

E5 .4/

/eati"e SACC

: Channel E5

: Channel E5 AC,

/.SC

A5S/

5S/ CMP

#1%

#6%

#)%

#-%

#%

#3%

#7%#8%

#9%

#10%

#11%

#16%

#1)%

#1-%

#17%

#19% #60%

#61%#66%

#6)%

#6-%

#63%

#67%

#68%

#69%

#)0%

#)1%

#)6%#))%

#)-%

#)%

#)3%

#)7%#)8%

#)9%

Figure 1.1 Mobile originating call establishment with OACSU (late assignment)

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Proe!ure

6章1% +he !i&&erene bet=een Error e&erene soure not &oun! an! :igure 1*1 is that

late assignment taes plae a&ter the Alerting in!iation is sent*

6% +he a!"antage o& late assignment lies in that it an sa"e the seiGure time o&

+Cs*

)% +he !isa!"antage o& late assignment is that i& the subseuent assignment is

unsuess&ul( the alle! MS an only hear the ring but annot establish a

onnetion( thus lea!ing to user omplaints* +here&ore( in atual appliation( this

proe!ure is generally not a!opte!* .nstea!( the proe!ure in Error e&erene

soure not &oun! is a!opte!*

**. Procedure e+planation

:or rele"ant e'planation( please re&er to 7*6*1Mobile Originating Call Establishment

=ithout OACS #Early Assignment%* +he proe!ure in :igure 7$6 is a proe!ure in

=hih the alling MS &irst hangs up*

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Proe!ure

6章7.2.3 Mobile Originating Call Establishment !ith O#C$% &-er' Earl'

#ssignment(

*. $ignaling procedure

)*

Channel AC+

Channel AC+ AC,

.MM ASS CM/

B+S BSC MSCMS

Channel 2/

SABM

ES+ .4/# CM Ser"ie E2%C#CMP 5) in&ormation%

CC

Setup

Call Proceeding

ASS E2

ASS CMP

Alerting

Connect

Connect ACK

+aling #6)%

DISC

REL

REL CMP

Clear CM/

Clear CMP

CM Service Accepted

Mo!e Mo!i&y #13%

Mo!e Mo!i&y AC, #17%

A

Channel E5

E5 .4/

/eati"e SACC

: Channel E5

: Channel E5 AC,

/.SC

A

5S/

5S/ CMP

#1%

#)%

#-%

#%

#3%

#7%#8%

#9%

#10%

#11%

#16%

#1)%

#1-%

#1%

#60%

#61%

#66%

#6-%

#6%

#63%

#67%

#68%

#69%

#)0% #)1%

#)6%

#))%

#)-%

#)%

#)3%

#)7%

Channel Mo!e Mo!i&y #18%

Channel Mo!e Mo!i&y AC, #19%

Channel E2

#6%

Figure 1.1 Mobile originating call establishment with OACSU (ver earl assignment)

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Proe!ure

6章1% +he !i&&erene bet=een Error e&erene soure not &oun! an! :igure 1*1 is that

the +C alloate! !uring the imme!iate assignment in :igure 7$) ser"es as a

signaling hannel* +here&ore( no +C nee! be realloate! !uring the assignment

proe!ure* .nstea!( the +C alloate! in the imme!iate assignment proe!ure is

a!Huste! as a +C by using the MOE MO.:F message*

6% ..

Channel Alloation table an! the I+C imme!iate assignmentJ &iel! in the DCell

all ontrol table*

6% pon reeipt o& the ES+AB5.SME4+ .4.CA+.O4 message in the ran!om

aess proe!ure( the BSC a!!s the C?. o& the urrent ell to the CM SE


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Proe!ure

6章on the IA$inter&ae Phase &lagJ &iel! in the D5oal O&&ie .n&ormation +able* +hen

it sen!s the message to the MSC*

7.4 #bnormal Cases

.n the ases o& loss o& messages on m inter&ae( all interruption( hangup( abnormal

operation o& transport/4SS/BSS euipment( the proe!ure may not be per&orme!

normally* .n a!!ition( i& MS resen!s multiple CA44E5 E2ES+ messages !uring

an aess attempt( BSS shall ati"ate multiple signaling hannels orrespon!ingly*

Atually( MS shall only seiGe 1 signaling hannel* Beause no ES+AB5.S

.4.CA+.O4 message an be reei"e! &rom MS by other hannels( other hannelsshall be release! upon timeout*

Beause there are "arious auses &or abnormal proe!ures( here( merely the

ommon ases are !esribe!*

7.4.1 #bnormal andom #ccess*mmediate #ssignment Procedure

*. E$#0,*$ *"*C#*O" message cannot be receied a/ter a channel has

been actiated

?enerally( there are the &ollo=ing auses &or this problem*

1% ue to !e&et !esign that !oes not omply =ith the protools( MS resen!s

multiple CA44E5 E2ES+ messages* As a result( BSS alloates an!

ati"ates too many signaling hannels*

E"en i& BSS runs normally( !uring an aess attempt( MS may resen! multiple

CA44E5 E2ES+ messages* As a result( BSS ati"ates multiple signaling

hannels* Atually( MS shall only seiGe 1 signaling hannel* Beause no

ES+AB5.S .4.CA+.O4 message an be reei"e! &rom MS by other hannels(

other hannels shall be release! =hen the +)101 timer e'pires*

6% On m inter&ae( uplin signals an be reei"e! normally( =hereas( !o=nlin

signals annot be properly reei"e! by MS*

By traing the m inter&ae on MS si!e( it may be &oun! that MS annot reei"e

the rele"ant in&ormation &rom B+S a&ter it sen!s a CA44E5 E2ES+

message*

.n that ase( the user shoul! he =hether the uplin/!o=nlin ' le"el an! '

uality are normal* .& MS is not &ar &rom B+S( but the signals are o& lo= ' le"el

an! poor ' uality( the user shoul! he =hether the antenna K &ee!er o& B+S(

the antenna o& MS( battery( et* =or normally*

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Proe!ure

6章)% +'$integer an! CCC are improperly on&igure! in BSC !ata on&iguration*

+he on&iguration mo!e o& +'$integer an! CCC has impat upon the

retransmission inter"al o& MS@s CA44E5 E2ES+ message*

**. 0$C sends an *MME*#E #$$*"ME" EEC message

.& BSC sen!s an .MME.A+E ASS.?4ME4+ ELEC+ message to MS upon reeipt

o& a CA44E5 E2ES+ message( generally( the auses may be as &ollo=s*

1% BSC annot &in! an appropriate signaling hannel #?enerally( the signaling

hannel is SCC( but it an also be +C% to alloate to the MS( generally(

beause no signaling hannel is a"ailable( e*g* all signaling hannels are in busystate or the hannels ha"e been bloe!*

6% B+S returns CA44E5 AC+.


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Proe!ure

6章1% +here is no appropriate +C &or alloation in BSC*

+here is no appropriate +C &or alloation in BSC( possibly beause all +Cs are in

busy state or ha"e been bloe!*

+he ASS.?4ME4+ :A.5E message returne! by BSC ontains the ause "alue

;4o ra!io resoure;*

.n that ase( the user an sol"e the problem by B+S e'pansion #a!!ing +%(

mo!i&ying the aess threshol! an! open the !iret re$attempt permit s=ith*

6% MS &ails to aess the +C( an! sen!s an ASS.?4ME4+ :A.5E message on

the signaling hannel*

ue to the partiularity o& the transmission on m inter&ae( this problem is atually

the most ommon problem in the net=or( an! annot be sol"e! ompletely* .& this

problem ours &reuently( it may lea! to user omplaints* +he maHor points to be

hee! are the antenna K &ee!er( the rele"ant boar!s in B+S( an! aess$relate!

parameters in BSC !ata on&iguration*

)% On BSC si!e( A inter&ae iruit is &oun! abnormal( e*g* +he C.C ontaine! in the

ASS.?4ME4+ E2ES+ message is not a"ailable*

.n that ase( the user shoul! he the A inter&aes*

-% Abnormality ours to the rele"ant euipment in BSC*

+he ASS.?4ME4+ :A.5E message returne! by BSC generally ontains the ause

"alue ;Euipment &ailure;*

.n that ase( the maHor points to be hee! are as &ollo=s*

+he boar!s an! their respeti"e baplanes an! optial &iber that are relate! to

the inter$mo!ule ommuniation in BSC( suh as ?MC6( ?MCC( ?S4+( ?OP+

an! ?:B.*

+he boar!s relate! to A inter&ae( suh as E)Ms( +CSMs an! their baplanes

% Abnormality ours to the transmission on inter&ae A*

**. irected etr'

Beause there is no appropriate +C &or alloation( an! the !irete! re$attempt

permit s=ith is set to ;On; in BSC !ata on&iguration( upon reeipt o& an

ASS.?4ME4+ E2ES+ message &rom MSC( BSC shall initiate a !irete! retry

han!o"er proe!ure as per the atual situation( so that MS an !iretly attempt to

aess other ells*

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Proe!ure

6章7.4.4 #bnormal Procedure Cause b' Call *nterruption

Call interruption might our in any proe!ure to the alling/alle! MS( an! as a

result( the subseuent proe!ures annot be omplete! normally* :or e'ample( a&ter

BSC reei"es an ASS.?4ME4+ E2ES+ message &rom MSC( all interruption

ours to MS on signaling hannel* .n that ase( the assignment proe!ure probably

is not be &inishe! #:or e'ample( the hannel is Hust assigne! an! the Assignment

Comman! is not sent% BSC probably shall not return an ASS.?4ME4+ COMP5E+E

or ASS.?4ME4+ :A.5E message to MSC* .nstea!( it shall sen! a C5EA

E2ES+ message*

7.4.5 #bnormal Procedure Caused b' angup

+he alling/alle! MS may hang up in any proe!ure( an! as a result( the subseuent

proe!ures annot be omplete! normally* :or e'ample( a&ter BSC reei"es an

ASS.?4ME4+ E2ES+ message &rom MSC( MS su!!enly hangs up* .n that ase(

the all establishment may be alrea!y terminate! be&ore BSC returns an

ASS.?4ME4+ COMP5E+E or ASS.?4ME4+ :A.5E message to MSC* As a

result( the proe!ure is neither a suess&ul assignment proe!ure #BSC sen!s an

ASS.?4ME4+ COMP5E+E message%( nor an unsuess&ul assignment proe!ure

#BSC sen!s an ASS.?4ME4+ :A.5E message%*

7.4.6 #bnormal Procedure Caused b' M$C Clearing

A&ter the lin onnetion on A inter&ae is establishe!( !ue to some auses( MSC may

sen! a C5EA COMMA4 or .SCO44EC+ message to BSC( an! as a result( the

subseuent proe!ures annot be omplete! normally* :or e'ample( a&ter BSC

reei"es an ASS.?4ME4+ E2ES+ message &rom MSC( MS su!!enly hangs up*

.n that ase( the all establishment may be alrea!y terminate! be&ore BSC returns an

ASS.?4ME4+ COMP5E+E or ASS.?4ME4+ :A.5E message to MSC* As aresult( the proe!ure is neither a suess&ul assignment proe!ure #BSC sen!s an

ASS.?4ME4+ COMP5E+E message%( nor an assignment &ailure proe!ure #BSC

sen!s an ASS.?4ME4+ :A.5E message%*

.& this problem &reuently ours( the &ollo=ing points shoul! be analyGe! speially*

1% +he ause "alue ontaine! in the C5EA COMMA4 message

.& a all terminates normally( the C5EA COMMA4 message generally ontains the

ause "alue ;Call ontrol;* Other=ise( it may ontain the ause "alue o& ;Protool

Error;( or ;Euipment &ailure;( et*

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Proe!ure

6章6% +he time !i&&erene bet=een the pre"ious message an! the C5EA COMMA4

or .SCO44EC+ message in the proe!ure

+he user an analyGe the time !i&&erene bet=een the t=o suessi"e messages( to

see =hether there is possibility that the abnormal proe!ure has been triggere! by

timeout*

第1 章 1-

07-mobile originating call establishment procedure

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