LTE CSFB Callflows v2014 0714

8/11/2019 LTE CSFB Callflows v2014 0714

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LTE CSFB Call FlowsEdited By Justin MA Created: June 2014 Updated: 2014_0714

Date and Version Author Change ote

2014_0!"0# $1%0 Justin MA Basi& &a'' ('o)s

2014_0714# $1%1 Justin MA Ca'' *e'ease )ith +*

LTE and SAE netwroks

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Ref: Ericsson

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Ref: Ericsson

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General Voice over LTE solutions:

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Ref: Ericsson

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Attach Procedure for LTE/C!"A #odes

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*e(:3GPP 23.272 V12.3.0


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Basic CSFB "$ Call Flow

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Ref:

...etc

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"o%ile $ri&inatin& call in Active "ode ' PS ($su))orted

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UE/MS

MMEBSS/RNS

MSCeNodeB SGSN Serving

GW

2. Optional Measurement Report Solicitation

!. "/#u$cs messa e &it' CM Service Re uest

!. CM Service Re uest

*ocation "rea Update or Com!ined R"/*" Update

+. CM Service Re,ect +. CM Service Re,ect

If the MSC

is changed

-a. S O as speci0ied in 2-.1 324 %preparation p'ase and start o0 e5ecution p'ase)

6. CS call esta!lis'ment procedure

a. E5tended Service Re(uest

!. S$" Re uest messa e &it' CS 7all!ac8 indicator

9. S O as speci0ied in 2-.1 324 %continuation o0 e5ecution p'ase)

c. S$" Response message

a. *ocation "rea Update

-c. U date Bearer s

-!. Sus end

$GW/

GGSN

d. MO CS7B #ndication

*e(:3GPP 23.272 V12.3.0


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"o%ile $ri&inatin& call in Active "ode * +o PS ($su))ort

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UE/MS MMEBSS/RNS MSCeNodeB


1!. *ocation "rea Update

1a. Service Re,ect

1c. CS MO call

6. UE c'anges R": t'en *" Update or R" Update or *"U and R"U

-a. N"CC;

+. S UE Conte5t Release

a. N"S E5tended Service Re(uest

SGW/GW

. S$"< S UE Conte5t ReleaseRe(uest

!. S$" UE Conte5t Modi0ication Re(uest &it' CS 7all!ac8 indicator

9a. Suspend %see 2-.161)

=. Update !earer%s)

SGSN

9!. Suspend Re(uest / Response

. Routing "rea Update or Com!ined R"/*" Update

-!; -c. RRC connection release

If the MSCis change

c. S$" UE Conte5t Modi0ication Response message

>. CM Service Re(uest >. "/#u$cs message %&it' CM Service Re(uest)

d. MO CS7B #ndication

*e(:3GPP 23.272 V12.3.0


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Basic CSFB "T Call Flow

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Ref: Huawei

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Ref: Huawei

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"o%ile Ter#inatin& call in idle #ode

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. #"M

-. #"M

. aging Re(uest

+. aging6. aging

2. SR# procedure in :S 2-.1=

G'"SCe+odeB ,+C/BSC

-E ""E (SS

"SC

VL,

=. "0ter t'e UE conte5t setup t'e procedure continues as descri!ed t'e activemode mo!ile terminated call procedures descri!ed in Clause 9.- and 9..

#0 t'e eNodeB 8no&s t'at S O is supported t'e procedure in clause 9.- ?Mo!ile:erminating call in "ctive Mode $ S O supported@ maA !e applied 0rom step 2; inClause 9.-; and on&ards

#0 t'e eNodeB 8no&s t'at S O is not supported t'e procedure in clause 9.?Mo!ile :erminating call in "ctive Mode No S O support@ s'all !e applied 0romstep 2 in Clause 9.; and on&ards

9a. E5tended Service Re(uest

9!. #nitial UE Conte5t Setup

9a. Service Re(uest

*e(:3GPP 23.272 V12.3.0


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"o%ile Ter#inatin& call in Active "ode ' PS ($su))orted

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a. *ocation "rea U date

!. aging Response !. "/#u$cs message %&it' aging Response)

+!. Signalling Connection Release +!. Connection Re,ectIf the MSCis changed

+!. *ocation "rea Update or Com!ined R"/*" Update

+c. CS call esta!lis'ment procedure

6. S O as speci0ied in 2-.1 324 %continuation o0 e5ecution p'ase)

+a. Esta!lis' CS

Option 1:MSC is not

changed

-c. U date Bearer s

-!. Sus end

$GW/

GGSN


-a. S O as speci0ied in 2-.1 324 %preparation p'ase and start o0 e5ecution p'ase)

e. S$" UE Conte5t Modi0ication Response message

d. S$" UE Conte5t Modi0ication Re(uest &it' CS 7all!ac8 indicator

UE/MS

MMEBSS/RNS

MSCeNodeB

SGSN

Serving

GW

!. N"S E5tended Service Re(uest

a. aging Re(uest

a. CS SER#CE NO:#7#C":#ON

c. CS aging Re,ect

a. Service Re(uest

*e(:3GPP 23.272 V12.3.0


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"o%ile Ter#inatin& call in Active "ode ' +o PS ($su))ort

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#7 :E

MSC #SC"NGED

UE/MS MME MSC

-a. CCO/N"CC; -!; -c. Signalling connection release

eNodeB

2. Optional Measurement Report

>. aging Response

>c. *ocation "rea Update or Com!ined R"/*" Update

>!. Signalling Connection Release

S$GW/GW

!. N"S E5tended Service Re(uest

d. S$" UE Conte5t Modi0ication Re(uest &it' CS 7all!ac8 indicator

c. CS aging Re,ect

9a. Suspend %see :S 2-.161)

=. Update !earer%s)

9!. Suspend Re(uest / Response

>!. CONNEC:#ON REEC:

". CS SER#CE NO:#7#C":#ON ". "G#NG REFUES:

SGSN

6.UE c'anges R": t'en; *"U OR R" UD":E OR *"U "ND R"U

+. S UE CON:E: RE*E"SE

BSS/RNS

. S$"< S UE CON:E: RE*E"SE REFUES:

". SER#CE REFUES:

e. S$" UE Conte5t Modi0ication Response message

>a. Esta!lis' CS connection

*e(:3GPP 23.272 V12.3.0


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Ref:

...etc

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,oa#in& ,etr. for CS fall%ack

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GMSC *R OldMSC/*R

Ne&MSC/*R

MS

RN %call re0.;GMSCH; Roaming retrA) 2

RN "CI %MSRN)SR# "CI

#"M %MSRN) aging

*ocUpdate

"ut'entication rocedureUpdate *ocation

Cancel *ocation -

Cancel *ocation "c8

RC %call re0erence; roaming retrA)

#nsert Su!scri!er Data %multiple)

#nsert Su!scri!er Data %continued)

Update *ocation "c8

7urt'er proceduresrelated to locationupdate. e.g.

cip'ering; :MS#reallocation.RN

Ne& MSC/*R maA delaA setup until

location update procedure 0inis'es =

RN "CI %MSRN)

*ocUpdate "ccept

:MS# Reallocation Complete

Normal M: call procedure 0ollo&s

Old MSC stops paging timer

and in0orm GMSC

2nd SR# "CI %MSRN)

2nd SR# %B; !asic call interrogation) +

RE* R*Cs

"CI

*R delaAs t'e sending o0RN until location update

procedure 0inis'es 6

SAE/LTE

CSFall%ack

Setup

SR# %B; GMSCH;call Re0.;RoamingretrA)

#"M %MSRN)

Call Con0irmed

*e(:3GPP 23.272 V12.3.0


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,oa#in& Forwardin& for CS fall%ack

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GMSC

*R

Old MSC/*R

Ne& MSC/*R

MS

SR# %B)

RN

RN "CI %MSRN)SR# "CI

#"M %MSRN) aging

*ocation Update

2. Update *ocation %

M:R7 supported

)

-. Cancel *ocation

%

M:R7 Supported "nd "ut'oriJed; Ne& MSC/*R num!ers)

Cancel *ocation "c8

6. RN %M:R7 indication; Old MSC num!er; last used *:E *MN)

#nsert Su!scri!er Data %multiple)

#nsert Su!scri!er Data %continued)

Update *ocation "c8

7urt'er proceduresrelated to location

update. E.g.cip'ering; #ME#c'ec8ing; :MS#reallocation.

1. Ne& MSC/*R delaAs setup untillocation update procedure 0inis'es.

=. RN Resp

%MSRN

K

)

>. #"M %MSRN

K

)

*ocation Update "ccept

:MS# Realloc Complete

Setup

Call Con0irmed

Normal M: call procedure 0ollo&s

. Old MSC stops paging timer

9. "0ter Update *ocation "c8

is received; t'e ne&*R returns MSRN

K

to t'e old *R.

+. #0 *R aut'orises M:R7 t'en use ne& MSC/*Rnum!ers to trigger sending o0 RN Re(

. Send #denti0ication%

M:R7 supported; Ne& MSC/*R num!ers

)

CSFB

*e(:

3GPP 23.272 V12.3.0


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0 ,TT CS Pre',e&istration over EPS Procedure

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5CS

CS7B

UE

E$U:R"N

MME5CS#WS

5R::

MSC

. 5R:: CS registration re(uest

a. U*/D* #n0ormation

:rans0er

!. U*/D* S cdma2111

:unnelling

c. S12 Direct :rans0er

6. 5R:: CS registration response

6c. U*/D* #n0ormation

:rans0er

6! U*/D* S cdma2111

:unnelling

6a. S12 Direct :rans0er

. UE attac'es to E$U:R"N as speci0ied in :S 2-.1

+. *ocation update to 5R:: CS domain

2. Decision to

register &it'

5R:: CS

-. Service Re(uest procedure i0 t'e UE is in idle state .

*e(:3GPP 23.272 V12.3.0


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CS MO call usin fall!ac" to C#M$ 1% R&& networ"

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5CS

CS7B

UE

E$U:R"N

MME 5CS

#WS

5R::

MSC

. UE is E$U:R"N attac'ed and registered &it' 5R:: CS

. 5 MO call esta!lis'ment per -G2 speci0ications

. UE Conte5t Modi0ication Re(uest

-. E5tended Service Re(uest

S $GW /

$GW

+. Optional measurement reportsolicitation

9. S UE Conte5t ReleaseRe(uest

=. Suspend Noti0ication

1. UE Conte5t Release

2. UE decisionto per0orm MO

call in 5CS

6. E$U:R"N triggers RRC connectionrelease &it' redirection

. UE Conte5t Modi0ication Response

>. Suspend "c8no&ledge

*e(:3GPP 23.272 V12.3.0


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CS "T call usin& fall%ack to C!"A 0 ,TT network

*e(:3GPP 23.272 V12.3.0

Documents

LTE CSFB Callflows v2014 0714