Csfb Feature Introduction

7/25/2019 Csfb Feature Introduction

1/28

Apr. 2006

Node B Products of Huawei

Huawei eRAN3.0

CSFB Feature Introduction

HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com


2/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidenia!

eRAN2.2 eRAN3.0eRAN2.1

CSFB to UTRAN

" #S HO" #S redire$ion

CSFB to !RAN" #S HO" #S redire$ion" CCO

CSFB to

C"#A2000 1$RTT

F%as& CSFB to

UTRAN

F%as& CSFB to

!RAN

CSFB to !RAN" CCO wi% NACC

Ne$t !'o%utions

Ada(ti'e )%ind

CSFB

CSFB Steerin*

CSFB wit& e#PS

CSFB to UTRAN

wit& +AI

CSFB to !RAN

wit& +AI

&e!ea'ed

#!annin(

#!anned

Huawei CSFB Feature Road,a(


3/28


Chapter One Feature Introduction

Architecture and functionalities

Mobile Originating call

Mobile Terminating call

SMS Emergency call

#a(e )


4/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidenia! #a(e *

CSFB- )rief introduction

Circuit Switc&ed Fa%%)ac /CSFB 3PP TS23.22

T%e CS fa!!+a$ in E#S ena+!e' %e pro-i'ionin( of -oi$e and o%er

CSdo/ain 'er-i$e' e.(. S1S LCS3 +4 reu'e of CS infra'ru$ure

w%en %e UE i' 'er-ed +4 E UT&AN.

T%i' fun$ion i' on!4 a-ai!a+!e in $a'e E UT&AN $o-era(e i'

o-er!apped +4 ei%er GE&AN $o-era(e or UT&AN

$o-era(e.


5/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5

CSFB: Architecture andfunctionalities

S711E

S1U

S77

!UTRAN

##!

S4

S

SSN

HSS5H+R

S6a

S*

S)

S72

Iup'

G+

P"N4

SGi

S:

#SC56+R

A

Iu$'

Gr

Ss

5U5+ &andset

"1u!i/ode GUL"CS;8 $apa+!e"Suppor of pro$edure'5

Co/+ined E#SI1SI

Aa$%, Updae, Dea$%.

"Deri-in( a


6/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page

CSFB: Mobile Originating call

&AT $%an(e and 'e!e$ion3 i' under fu!! newor $onro! eNode8 ri((er' %e

&AT $%an(e oward' o 2G)G +a'ed on %e UE?' $apa+i!i4@/ea'ure/en@S#ID

indi$aion fro/ 11E.3

NodeB RNC

eNodeB SA!4

3

+T!

#SC6+R

Ss

HSS5H+R

Inter3s9ste,c

&an*e

:.Initiate 'oice ca%%

##!

.IA#

1. !$t Ser'ice R;

/CSFB indicator

SSN


7/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page !

CSFB: Mobile Terminating call

NodeB RNC

eNodeB SA!4

3

+T!

#SC6+R

Ss

2. Pa*in* R;

/"o,ain indicator-

CS

>.Pa*in

*Res(onse

HSS5H+R

Inter3s9ste,c

&an*e

?.6oice ca%% esta)%is&,ent

##!

1.IA#

SSN

. eNB direct t&e U! to 5U

=.,easure,ent PS redirection5 &&C re!ea'e wi%

Bredire$edCarrierInfoIE o UE

R? PS redirection5 &&C re!ea'e wi% a

$arrier fre=uen$4 and UT&AN $e!!?' SI8'

a$=uired +4 &I1 pro$edure' +efore CS;8.


14/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page "$

CSFB to !RAN- Four ,ec&anis,s

R> PS Hando'er5 +a'e on %e

iner&AT #S %ando-er pro$edure'

R> PS redirection5 &&C re!ea'e wi%

Bredire$edCarrierInfoIE o UE

R? PS redirection5 &&C re!ea'e wi% a

$arrier fre=uen$4 !i' and $e!!?' SI8'

a$=uired +4 &I1 pro$edure' +efore CS;8.

R> CC7 wit& NACC- Hando-erCo//and

Wi% ar(e $e!! and SI


15/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page "5

CSFB: SMS

UE i' E#SI1SI aa$%ed and %e CS

a$$e'' do/ain i' $%o'en +4 %e UE

andor %e %o/e #L1N for de!i-erin(

'%or /e''a(e'.

S1S 'uppor i' +a'ed on %e

$onne$ion!e'' SG' referen$e poin

+eween %e 11E and %e 1SC

Ser-er and u'e of NAS 'i(na!!in(+eween %e UE and %e 11E.

T%e 1O S1S and 1T S1S are

'i(na!!ed o-er SG' and do no $au'e

an4 CS ;a!!+a$ o GE&ANUT&AN

&AT', and $on'e=uen!4 doe' no

re=uire an4 o-er!apped

GE&ANUT&AN $o-era(e.

No CS Fallback is perormed or SMS


16/28

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page "

CSFB: Emergency call

EUT&AN /a4 u'e %e e/er(en$4 indi$aion for 'e!e$in( a pari$u!ar radio a$$e''newor 2G or )G3 for CS e/er(en$4 %and!in(.

If #S %ando-er i' iniiaed, EUT&AN /a4 indi$ae priori4 !e-e! of %e CS;8 o %e

ar(e &AT, in order o prepare radio re'our$e a ar(e &AT in appropriae wa4,

e.(. priori4 a!!o$aion of %e &A8 re'our$e.


17/28


Chapter To: CSFB Algorithm at e!B

Tri((erin( p%a'eT%e eNode8 re$ei-e' a CS ;a!!+a$ Indi$aor fro/ %e

11E. If %e eNode8 'uppor' +!ind %ando-er' o an

iner&AT '4'e/, i perfor/' a +!ind %ando-er wi%ou

de!i-erin( %e /ea'ure/en $onfi(uraion o %e UE.

O%erwi'e, %e eNode8 de!i-er' %e /ea'ure/en

$onfi(uraion o %e UE. Co/pared wi% /ea'ure/en

+a'ed %ando-er', +!ind %ando-er' $an redu$e %e

a$$e'' de!a4. T%erefore, +!ind %ando-er' ae

pre$eden$e o-er /ea'ure/en+a'ed %ando-er'.

8!ind %ando-er', %owe-er, %a-e an i/pa$ on %e%ando-er 'u$$e'' rae.


18/28


T%e eNode8 de!i-er'

%e iner&AT

/ea'ure/en

$onfi(uraion, and %e

UE perfor/' iner&AT

/ea'ure/en'

a$$ordin(!4.

In a+nor/a! $a'e', eN8

perfor/' +!ind

pro$edure.

T%e eNode8 e>e$ue'

CS;8 o ena+!e %e UE

o iniiae %e -oi$e $a!!

in %e ar(e $e!!.

T%e on(oin2( #S

'er-i$e' of %e UE /i(%

+e %anded o-er o %e

ar(e $e!! or 'u'pended

in %e 'our$e $e!!.

1ea'ure/en

#%a'e

De$i'ion

#%a'e

E>e$uion

Hando-er

T%e eNode8 $%e$'

%e /ea'ure/en

re'u!' and

(enerae' a !i' of

$andidae $e!!'.

e&AN2 02 7


19/28


"# CSFB

e&AN2.02.7

8!ind S$enario A !i' of $andidae $e!!' i' (eneraed on %e +a'i' of %e +!ind %ando-er prioriie', w%i$% are deer/ined +4

+o% %e &AT'pe$ifi$ prioriie' and %e $e!!'pe$ifi$ prioriie'. T%e &AT'pe$ifi$ prioriie' u'ed in +!ind %ando-er' for CS;8 are defined %rou(% %e InterRatHi*&estPri,

InterRatSecondPri, and InterRat+owestPripara/eer'.

1ea'ure S$enario

eN8 'end' %e UE %e /ea'ure/en $onfi(uraion, a$$ordin( o w%i$% %e UE perfor/' /ea'ure/en' on %e

'pe$ified '4'e/. T%e /ea'ure/en $onfi(uraion 'en o %e UE $onain' %e $onfi(uraion infor/aion for

on!4 %e &AT' and fre=uen$ie' %a are 'uppored +4 %e UE.

eN8 'e!e$' %e +e' $e!! fro/ UE?' /ea'ure/en repor.

Mni' %e /ea'ure/en re'u! of %e nei(%+orin( $e!!.Ofni' %e fre=uen$4'pe$ifi$ off'e for %e fre=uen$4 of %e nei(%+orin(

$e!!.Hysi' %e %4'ere'i' for e-en 87.Threshi' %e %re'%o!d for e-en 87. T%e -a!ue' of Threshare 'e on

%e +a'i' of %e /ea'ure/en =uaniie' of ea$% &AT.T%e &e$ei-ed Si(na! Code #ower &SC#3 %re'%o!d for CS;8 o

UT&AN, E$No %re'%o!d for CS;8 o UT&AN, %re'%o!d for CS;8 o

GE&AN, and %re'%o!d for CS;8 o CD1A2000 7>&TT are 'pe$ified

%rou(% %e Csf)HoUtranB1T&dRSCP, Csf)HoUtranB1T&d!CN0,

Csf)HoeranB1T&d, and Csf)HoC"#AB1T&dPSpara/eer'

re'pe$i-e!4.

ThreshHysOfnMn >+87 enerin( $ondiion5

e&AN2 2


20/28


Flash CSFB $ "% redirection ithSIBs

2G)G

A$$e''

LTE

A$$e''

RI# -RAN

infor,atione$c&an*in*

SSN

S#5U#TSS#5U#TS

CoreCore

##!

+T! Core+T! Core

F%as& CSFB-

" Sa-in( 1sfor U1TS $o/pare wi% &9

CS;8

" Sa-in( 2sfor GS1 $o/pare wi% &9

CS;8

Fre@uenc9 and

tar*et ce%%

s9ste,

infor,ation

!e" #oi$t:7. eN8 re=ue' '4'e/ infor/aion fro/ 8SC&NC

w%en e'a+!i'% Iner&AT nei(%+or re!aion

2. 8SC&NC rep!4 '4'e/ infor/aion. If '4'e/

infor/aion updae 8SS&NC noif4 eNode8 and

'end %e !ae' infor/aion

). Core Newor doe'n? %and!e %e /e''a(e, on!4

forward

*. eN8 doe'n? ran'!ae /e''a(e fro/

8SC&NC 'end o UE dire$!4

. eN8 fi!! ou %e ar(e fre=uen$4 and re!aed nei(%+or

$e!! infor/aion in &&C&e!ea'e /e''a(e.

8SC&NC

&AN

infor/aion

&

AN

infor/aion

re=ue'

e&AN2.2

e&AN) 0
http://mobile.younet.com/files/22/22305.html


21/28


CSFB to &T"A!'(E"A! ith )AI

+AI Based CSFB-

7. #riori4 o 'e!e$ ar(e GU $e!!' wi% 'a/e

LAC a' UE re(i'ered in GU NW durin(CS;8 o a-oid LAU 0.'F)'3.

2. Suppor Naiona! &oa/in( Ue o 'e!e$

'uia+!e fa!!+a$ &ATCe!! +a'e' on LAI

Indi$aor a/on( /u!i#L1N'.

TA35+A1

TAI5+A

I

##!

+T!+T!

CoreCore

U+

U+

U+

TA15+A1

TA25+A2

Se%ect sa,e +A toCSFB

CSFB to

+A1

e&AN).0

Sep75 eN8 re$ei-e' B&e(i'ered LAI fro/ 11E

11E 'end' B&e(i'ered LAI o eN8 -ia BIniia!Cone> Seup &e=ue' or BUE Cone>

1odifi$aion &e=ue' /e''a(e.

Sep25 eN8 'e!e$' ar(e newor wi% LAI

$on'ideraion

7 8!ind $a'e5 fo!!owin( %e priori4 +e!ow.

7Nei(%+orin( $e!! wi% %e 'a/e LAI wi%

B&e(i'ered LAI

2Nei(%+orin( $e!! wi% %e 'a/e #L1N wi%

Bre(i'ered LAI

)Nei(%+orin( $e!! wi% %e 'a/e #L1N wi%

%e UE $urren 'er-in( #L1N.

21ea'ure/en $a'e5

7if an4 of %e nei(%+orin( fre=uen$4?' $e!!

#L1N i' %e 'a/e wi% B&e(i'ered LAI, or if an4

of %e nei(%+orin( fre=uen$4?' $e!! #L1N i' %e

'a/e wi% %e UE $urren 'er-in( #L1N, and %e

UE 'uppor' %e &AT and %e fre=uen$4, eN8 wi!!

'end %e'e fre=uen$4 o UE for /ea'urin(.

2eN8 wi!! $%oo'e %e 'a/e LAI fro/ %e

/ea'ure/en repor'.
http://mobile.younet.com/files/22/22305.htmlhttp://mobile.younet.com/files/22/22305.html


22/28


CSFB *ey parameters

#7 Para,eter I" "escri(tion

CS;a!!8a$8!indHoCf( Iner&aHi(%e'#ri Indi$ae' %e %i(%priori4 '4'e/ o +e $on'idered in +!ind %ando-er' for CS

fa!!+a$. I i' UT&AN +4 defau!.CS;a!!8a$8!indHoCf( Iner&aSe$ond#ri Indi$ae' %e /ediu/priori4 '4'e/ o +e $on'idered in +!ind %ando-er' for CS

fa!!+a$. I i' GE&AN +4 defau!. If %i' para/eer i' 'e o nu!!, %e '4'e/ wi% %e

/ediu/ +!ind %ando-er priori4 i' no 'pe$ified. In %i' $a'e, on!4 %e +!ind

%ando-er' o %e %i(%priori4 '4'e/ are app!i$a+!e.

CS;a!!8a$8!indHoCf( Iner&aLowe'#ri Indi$ae' %e !owpriori4 '4'e/ o +e $on'idered in +!ind %ando-er' for CS fa!!+a$.

I i' CD1A2000 +4 defau!. If %i' para/eer i' 'e o nu!!, %e '4'e/ wi% %e !ow

+!ind %ando-er priori4 i' no 'pe$ified. In %i' $a'e, on!4 %e +!ind %ando-er' o %e

%i(% and /ediu/priori4 '4'e/' are app!i$a+!e.

CS;a!!8a$8!indHoCf( UranL$'Cap Indi$ae' %e Lo$aion Ser-i$e' LCS3 $apa+i!i4 of %e UT&AN.

CS;a!!8a$8!indHoCf( GeranL$'Cap Indi$ae' %e Lo$aion Ser-i$e' LCS3 $apa+i!i4 of %e GE&AN.

CS;a!!8a$8!indHoCf( Cd/aL$'Cap Indi$ae' %e Lo$aion Ser-i$e' LCS3 $apa+i!i4 of %e CD1A2000.

CS;a!!8a$Ho C'f+HoUranTi/eToTri( Indi$ae' %e i/eori((er for e-en 87 %a i' u'ed in CS fa!!+a$ o

UT&ANGE&ANCD1A2000. W%en CS fa!!+a$ o UT&ANGE&ANCD1A2000 i'

app!i$a+!e, %i' para/eer i' 'e for UE' and u'ed in %e e-a!uaion of w%e%er o

ri((er e-en 87. W%en dee$in( %a %e 'i(na! =ua!i4 in a !ea' one

UT&ANGE&ANCD1A2000 $e!! /ee' %e enerin( $ondiion, %e UE doe' no

'end a /ea'ure/en repor o %e eNode8 i//ediae!4. In'ead, %e UE 'end' a

repor on!4 w%en %e 'i(na! =ua!i4 $oninuou'!4 /ee' %e enerin( $ondiion durin(

%e i/eori((er. T%i' para/eer %e!p' de$rea'e %e nu/+er of o$$a'iona!!4ri((ered e-en repor', %e a-era(e nu/+er of %ando-er', and %e nu/+er of wron(

%ando-er', and %u' %e!p' pre-en unne$e''ar4 %ando-er'. ;or deai!', 'ee )G##

TS )6.))7.CS;a!!8a$Ho C'f+HoGeranTi/eToTri(

CS;a!!8a$Ho C'f+HoCD1ATi/eToTri(


23/28


#7 Para,eter I" "escri(tion

CS;a!!8a$Ho C'f+HoUran87T%d&SC# Indi$ae' %e &SC# %re'%o!d for e-en 87, w%i$% i' u'ed in CS fa!!+a$ o UT&AN.

W%en CS fa!!+a$ o UT&AN i' app!i$a+!e, %i' para/eer i' 'e for UE' and u'ed

in %e e-a!uaion a+ou w%e%er o ri((er e-en 87. T%i' para/eer indi$ae' %e

&SC# re=uire/en for %e UT&AN $e!!' o +e in$!uded in %e /ea'ure/en repor.

A UE 'end' a /ea'ure/en repor re!aed o e-en 87 o %e eNode8 w%en %e

&SC# in a !ea' one UT&AN $e!! e>$eed' %i' %re'%o!d and o%er ri((erin(

$ondiion' are /e. ;or deai!', 'ee )G## TS )6.))7.

CS;a!!8a$Ho C'f+HoUran87T%dECN0 Indi$ae' %e E$No %re'%o!d for e-en 87, w%i$% i' u'ed in CS fa!!+a$ o UT&AN.

W%en CS fa!!+a$ o UT&AN i' app!i$a+!e, %i' para/eer i' 'e for UE' and u'ed

in %e e-a!uaion a+ou w%e%er o ri((er e-en 87. T%i' para/eer indi$ae' %e

E$No re=uire/en for %e UT&AN $e!!' o +e in$!uded in %e /ea'ure/en repor.

A UE 'end' a /ea'ure/en repor re!aed o e-en 87 o %e eNode8 w%en %e

E$No in a !ea' one UT&AN $e!! e>$eed' %i' %re'%o!d and o%er ri((erin(

$ondiion' are /e. ;or a $e!! wi% !ar(e 'i(na! fadin( -arian$e, 'e %i' para/eer

o a !ar(e -a!ue o pre-en unne$e''ar4 %ando-er'. ;or a $e!! wi% '/a!! 'i(na!

fadin( -arian$e, 'e %i' para/eer o a '/a!! -a!ue o en'ure %a %e %ando-er i'

perfor/ed in i/e. ;or deai!', 'ee )G## TS )6.))7.

CS;a!!8a$Ho C'f+HoGeran87T%d Indi$ae' %e &SSI %re'%o!d for e-en 87 %a i' u'ed in CS fa!!+a$ o GE&AN. A

UE 'end' a /ea'ure/en repor re!aed o e-en 87 o %e eNode8 w%en %e &SSI

in a !ea' one GE&AN $e!! e>$eed' %i' %re'%o!d and o%er ri((erin( $ondiion'

are /e. ;or deai!', 'ee )G## TS )6.))7.

CS;a!!8a$Ho C'f+HoCD1A87T%d#S Indi$ae' %e pi!o 'ren(% %re'%o!d re!aed o e-en 87, w%i$% i' u'ed in CS

fa!!+a$ o CD1A2000. A UE 'end' a /ea'ure/en repor re!aed o e-en 87 o

%e eNode8 w%en %e pi!o 'ren(% in a !ea' one CD1A2000 $e!! e>$eed' %i'

%re'%o!d and o%er ri((erin( $ondiion' are /e. ;or deai!', 'ee )G## TS

)6.))7.


24/28


#7 Para,eter I" "efau%t 6a%ue Actua% Unit ##+ Co,,and

CS;a!!8a$8!indHoCf

(

Iner&aHi(%e'#ri UT&AN UT&AN, GE&AN,

CD1A2000

UT&AN, GE&AN,

CD1A2000

None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

G

CS;a!!8a$8!indHoCf

(

Iner&aSe$ond#ri GE&AN UT&AN, GE&AN,

CD1A2000, NULL

UT&AN, GE&AN,

CD1A2000, NULL

None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

G

CS;a!!8a$8!indHoCf

(

Iner&aLowe'#ri CD1A2000 UT&AN, GE&AN,

CD1A2000, NULL

UT&AN, GE&AN,

CD1A2000, NULL

None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

GCS;a!!8a$8!indHoCf

(

UranL$'Cap O;;Off3 O;;Off3, ONOn3 O;;, ON None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

G

CS;a!!8a$8!indHoCf

(

GeranL$'Cap O;;Off3 O;;Off3, ONOn3 O;;, ON None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

G

CS;a!!8a$8!indHoCf

(

Cd/aL$'Cap O;;Off3 O;;Off3, ONOn3 O;;, ON None 1OD

CS;ALL8AC8LINDHOC;

G

LST

CS;ALL8AC8LINDHOC;

G


25/28


#7 Para,eter I" "efau%t 6a%ue Actua% Unit ##+ Co,,and

CS;a!!8a$Ho C'f+HoUranTi/

eToTri(

*0/' 0/', *0/', 6*/',

90/', 700/', 729/',760/', 26/', )20/',

72/', *90/', 6*0/',

702*/', 7290/',

260/', 720/'

0/', *0/', 6*/',

90/', 700/',729/', 760/',

26/', )20/',

72/', *90/',

6*0/', 702*/',

7290/', 260/',

720/'

/' 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoGeranTi/

eToTri(

*0/' /' 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoCD1ATi

/eToTri(

*0/' /' 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoUran87T

%d&SC#

706 720F2 720F2 d8/ 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoUran87T

%dECN0

7) *9F0 2*F0 0.d8 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoGeran87

T%d

70) 770F*9 770F*9 d8/ 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

CS;a!!8a$Ho C'f+HoCD1A87

T%d#S

)* 6)F0 )7.F0 0.d8 1OD CS;ALL8ACHO

LST CS;ALL8ACHO

Swi$%e' are no '%own %ere. #!ea'e refer o CS;8 ;#D.


26/28

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential #age %&

C&a(ter T&ree- A%*orit&, Re%ations&i(

LO;D0070)) CS ;a!!+a$ o UT&AN depend' on LO;D00707 #S Iner&AT 1o+i!i4

+eween EUT&AN and UT&AN.

LO;D0070)* CS ;a!!+a$ o GE&AN depend' on LO;D007020 #S Iner&AT 1o+i!i4

+eween EUT&AN and GE&AN.

LO;D0070) CS ;a!!+a$ o CD1A2000 7>&TT depend' on LO;D007027 #S Iner&AT

1o+i!i4 +eween EUT&AN and CD1A2000.

LO;D00702 ;!a'% CS ;a!!+a$ o UT&AN depend' on LO;D0070)) CS ;a!!+a$ o UT&AN.

LO;D0070) ;!a'% CS ;a!!+a$ o GE&AN depend' on LO;D0070)* CS ;a!!+a$ o

GE&AN.

LO;D007069 CS ;a!!+a$ wi% LAI o UT&AN depend' on LO;D0070)) CS ;a!!+a$ o

UT&AN. LO;D00706 CS ;a!!+a$ wi% LAI o GE&AN depend' on LO;D0070)* CS ;a!!+a$ o

GE&AN.

#a(e 26


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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential #age %'

C&a(ter Four- Use Case

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+T!+T!

co'era*eco'era*eU+ dua%,ode U!

Ca/pin( LTE3


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HUAWEI TECHNOLOGIES Co Ltd HUAWEI Confidential #age %(

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Documents

Csfb Feature Introduction