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STN-SR for SRVCCHi

Can anyone conrm if the STN-SR used in Single Radio Voice Call

Continuity is a PSI (Public Serice Identity!" If so can you indicate

#hich s$ecication states that it is%

If it is then I can see ho# it hel$s in routing the INVIT&' follo#ing

session transfer initiation' to#ards the SCC-S but I cannot see ho#

it might be used to identify the S-CSC) used to setu$ u$ the

original session' i"e" the one on #hich the concerned *& is

registered #ith"

Is it the case that the INVIT& must be routed to the original S-CSC)

or can it be any S-CSC) ca$able of triggering the SCC-S% If it is the

latter ho# does the S-CSC) get the triggering information%

ny hel$ #ould be a$$reciated"

 Than+s in adance"

 ,e 

Mustajaab Dar

STN-SR is the $ublic serice identity. fter successful authenticatedregistration S-CSC) do#nloads STN-SR and all the registered $ublic

user identities associated"See /0"/123/0"/4/

ugust 15' /610

 Jef Cartwright

 Than+ 7ou 8usta9aab :ar"

;ood to +no# that it is a PSI"

ugust 1<' /610Mustajaab Dar

re you $re$aring some +ind of training material for SRVCC%

ugust 1<' /610

 Jef Cartwright

I am $re$aring to teach a Vo=T&3I8S course #hich has an element of

SRVCC information contained in it" So I am 9ust trying to better

understand some of the ner $oints of SRVCC' the routing issue #as

$roing a bit tough"

ugust 1<' /610

Abinash Kumar Singh

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Hello ,e'

Session Transfer Number SRVCC (STN-SR! is congured for an SRVCC

subscriber at the time of serice $roisioning(/0"/0>!

HSS $roides the STN-SR to the 88& that is $roisioned for a *&

during its attach $rocedure

? If the user has an actie conte@t at the 88&' the HSS also u$date

the 88& if the STN-SR has been modied for that *&

88& sends the STN-SR in the SRVCC PS to CS ReAuest to the 8SC

oer the S interface

8SC initiates a reAuest for an access transfer of the actie session

from the I8S net#or+ and includes the STN-SR in the reAuest

 The SCC S eentually receies INVIT& message #ith STN-SR #hich

indicate the need for an access tarnsfer of the actie session"SCC S is the entity in the I8S domain that handles management of

the access transfer of an actie session

SCC S co-ordinate the $ro$er media and signalling e@change to the

access net#or+ of #here the *& is $resent" STN-SR is the number that

is used to facilitate the co-ordination

ugust //' /610

 Jef Cartwright

Hi binash

 Than+s for your in$ut" Very *seful"

ugust //' /610

Andreas Kret

Hi ,e'

you #roteBI cannot see ho# it might be used to identify the S-CSC)

used to setu$ u$ the original session' i"e" the one on #hich the

concerned *& is registered #ith" B

? I thin+ the SRVCC call must be routed to the S-CSC) #here the user

is registered' because his call is anchored here (in the SCC-S

connected to the S-CSC)!"

? The correct S-CSC) is found #hen the I-CSC) uses PI for Auery to

HSS (=IR' =I!"

STN-SR is a &"1< number' routable is CS net#or+ (SRVCC-8SS routes

the call to 8;C)!" Ho#eer #hen the call is inside I8S ho#eer this istreated as a PSI in my understanding"

Cheers' ndreas

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Use of Session Transfer Number STN-SR in SRVCC

Omar14 Jun 2013 4:16 PM

• Comments 0 

Purpose of STN-SR: According to TS 23.003, STN-S !o""o#s t$e %.164te"ecommunic&tions num'er !orm&t, &nd is used '( t$e MSC ser)er !or session tr&ns!er o!t$e medi& *&t$ !rom t$e PS dom&in to t$e CS +om&in.

oT% is & e( &**"ic&tion in T%. A /% s$ou"d $&)e continuous &nd se&m"ess )oice ser)ice&s t$e( mo)e &cross di!!erent &ccess tec$no"ogies. T$e MS net#or *ro)ides t$e c&"" &nc$or #$ic$ en&'"es suc$ se&m"ess ser)ice continuit( or #$&t is no#n &s Sing"e &dio oice C&""Continuit( SCC &s one o! t$e st&nd&rd met$ods !or &ccom*"is$ing oice C&"" Continuit(CC. T$e entit( in t$e MS net#or #$ic$ m&n&ges SCC is t$e Ser)ice Centr&"i&tion

&nd Continuit( A**"ic&tion Ser)er SCC AS.

What role does the STN-SR play in SRVCC?

e"o# is & "ist o! items t$&t e"&'or&tes on t$e us&ge o! t$e STN-S in SCC:

-  According to TS 23.235, t$e STN-S is con!igured !or &n SCC su'scri'er &t t$e timeo! ser)ice *ro)isioning.

-  According to section .3.5 o! TS 23.216, t$e 7SS *ro)ides t$e STN-S to t$e MM% t$&tis *ro)isioned !or & /% during its &tt&c$ *rocedure.

- ! t$e user $&s &n &cti)e conte8t &t t$e MM%, t$e 7SS &"so u*d&tes t$e MM% i! t$eSTN-S $&s 'een modi!ied !or t$&t /%.

-  According to section 6.2.2.1 o! TS 23.216,

•

o T$e MM% sends t$e STN-S in t$e SCC PS to CS re9uest to t$e MSC o)ert$e S) inter!&ce.

o T$e MSC initi&tes & re9uest !or &n &ccess tr&ns!er o! t$e &cti)e session !romt$e MS net#or &nd inc"udes t$e STN-S in t$e re9uest.

-   According to section 6.3.2.1.4 o! 23.235

•

o T$e SCC AS e)entu&""( recei)es &n NT% #it$ t$e STN-S #$ic$ indic&test$e need !or &n &ccess tr&ns!er o! &n &cti)e session.

T$e SCC AS is t$e entit( in t$e MS dom&in t$&t $&nd"es m&n&gement o! t$e &ccess tr&ns!ero! &n &cti)e session &ccording to section 6.3.2.1.4 o! TS 23.235. T$e SCC AS coordin&test$e *ro*er medi& &nd sign&"ing e8c$&nge to t$e &ccess net#or o! #$ere t$e /% is *resent.T$e STN-S is t$e num'er t$&t is used to !&ci"it&te t$&t coordin&tion.

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• !ore"#$"lan%ua%e&'ormatStrin%(!ore"#$"lan%ua%e&)etResour!e(*+lo%"Post,uestionns.erVie."CommentsCount'ormatStrin%*/ post&CommentCount/Vo1T2, 3%, lte, session, stn-sr , SRVCC 

i"" t$e oT% )oice 're& '( /% me&surement !or AT during SCC

 As (ou no#, /% #i"" do me&surement to 'ot$ AT !or T% &nd 3; 'e!ore doing SCC,!rom m( underst&nding, /% #i"" do me&surement to mu"ti*"e eN #it$ s&me !re9uenc(#it$out )oice 're&, e)en !or t$e AT me&surement, t$e !re9uenc( is com*&ti'"e, so t$e

AT me&surement #i"" not 're& )oice o! oT%, is t$is underst&nding true<

SRVCC 4RT 5easurement 

=ou $&)e *osted to & !orum t$&t re9uires & moder&tor to &**ro)e *osts 'e!ore t$e( &re*u'"ic"( &)&i"&'"e.

eri!ied Ans#er 

•

Posted '( Cellular 26perton $$ 7an $083 9:;9 5 eri!ied Ans#er eri!ied '( eri!h 

T$is is true. >or AT me&surements t(*ic&""( me&surement g&*s &re used #it$ 40 or ?0 ms*eriodicit(. >or oice, t$e /% sends @ recei)es & sing"e *&cet e)er( 20 ms or t#o *&cetse)er( 40 ms, &nd t$ose *&cets c&n 'e sent on time e)en i! t$e me&surement g&*s &reused. n t$e recei)ing end, t$ere is & itter 'u!!er to de&" #it$ *&cets &rri)ing #it$ )&r(inginter)&"s note t$&t t$is c&n &"so t&e *"&ce i! e.g. )oice *&cets need to 'e retr&nsmitted )i&7AB.

SCC P&r&meters....#$ic$ *&r&meter needs to 'e t&e into consider&tion !or SCC c&se.....!rom )o"te to 3;....TTT,timer 304, A2

,2 t$res$o"d...&n(t$ing e"se &*&rt !rom t$is..... m tr(ing to !orce /% !rom "te to 3; .....

搶先回應

•

<eepa= Tya%i

+id (ou c$ec t$e STN-S *&r&meter, P"e&se c$ec #$et$er MM% is *ro)iding STN-S to t$e T&rgetMSC on S) inter!&ce in e"oc&tion e9uest mess&ge.

個月前

• C$ec #$et$er

D SCC is su**orted !or t$&t /%. =ou c&n !ind !rom &tt&c$ re9uest SCC to ;%AN@/TANc&*&'i"it( E1

D MM% $&s t$ese in!o !rom 7SSF STN-S, C-MSS+N &nd o*tion&" CS !"&g

D N is c&*&'"e !or con!iguring me&surement g&*s &nd c$&nne" me&surement !or SCC

SCC *rocess is "ie:

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EEEEEEEEEEEEEEEEEED SCC c&*&'i"it( negoti&tion 'et#een /% &nd N

D oT% c&"" st&rted PS-c&""

D /% does me&surement &nd once t$res$o"d condition met, 7G $&**en to -ce""

4H n -cdm& /% uses CS *&t$ &nd )oice c&"" continues in -C+MA

個月前

•

7><22PS4N @ala

t$&ns !or (our res*onse......m( 9ue is ce"" is 'ui"t &t t$e edge "e)e" #$ere #e #&nt /% to !orce on

/MTS !rom MS....so #$ic$ *&r&meter need to set in eN, no# t$res$o"d )&"ue o! &2 &nd '2 #$ere &2 is !or e-utr&n&nd '2 !or umts....timer t304....&n( ot$er *&r&meter #e need to set !rom MM% side &"so....do #e need tosto* PS 7o &""o#ed &"so.....

個月前

•

ShehAad mir 

IJ&(dee*

t is not necess&r( to dis&'"e PS 7G .

Need to c$&nge t$e settings !or t$e Neig$'or e"&tions de!ine in eN to CS &nd PS, i! t$e( &recon!igured on"( '( PS.

Needs to c$ec t$&t eN is not o)er#riting t$e c&*&'i"it( in!o sent '( /%, i $&)e seen & c&se #$ere10 /% c&*&'i"it( in!o #&s o)er#ritten &nd SCC #&s not #oring. Norm&""( t$is $&**ens #it$ t$e

du&" mode /% #$ic$ sent t#o in!o in one mess&ge &nd eN t&e t$e AN+ &nd !or#&rd it.

SCC s$ou"d 'e &""o#ed on 'ts &nd ce"" "e)e" on eN

>rom MM% *ers*ecti)e (ou need to m&* t$e 4; BC to 3; BC &d )ice )ers&

個月前

• IJ&(dee*

s it #oring !or (ou< C&n (ou s$&re (our o'ser)&tion..

個月前

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•

7><22PS4N @ala

7 S$&i"es$...#e $&)e not )isi'i"it( on %PC side...'ut #e c$&nge some *&r&meters "ie &2 t$res$o"d,TTT !or &2 e)ent, '2 t$res$o"d &nd TTT !or '2 e)ent &nd more SCC 7G indic&tion *&r&meter !rom 0to 1 t$&t sto*s PS $&ndo)er &nd on"( BC1 #i"" 'e m&**ed to /MTS....#e &re #&iting !orim*"ement&tion t$ose c$&nges ....

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向 I8S388Telì‹ÅGáÃ4ÁOABÄDEP%]動MäJ^9

I8S388Teló¨ÁZ`À個“ÅOABÆDEP/lHC個žâ =T& +,/ùC個Tžâ

/;30;+,901£uÉ‹Å的 =T& +,óuâ±² 8&&與 =T& RN4{的+行“Å/

“Euv裝置準³U語音‹Å作業GáA CS+,9Q‹Å,4A的 CS+,óuâ‹ÅGá

†Ç/°準³ÈuŒ23‹Å9

¶ÉÊÅYË+行T/uv裝置‰);‘’語音‹Å的 I8S388TelóNA CS+,/

£‹ÅÌÜ進行OABÍDEP9

 圖Ã : 進ÄÅ的 VoLTE>?9:

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 圖Æ : 9:ÇÈÉÊ

 

圖Ë : cd IRAT¿ÀÌ9:ÇÈÍÎ

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 圖Ï : ÇÐÑ CS78的語音ÒÓÔÕ

9:Ö×ØÙÐ回LTE

Îk SRVCC 的7置çóÏÈÐÑLI ;S83GC:8的 RN Ò•/kQ語音‹Å·ÓÁ

uv裝置Zâ =T& PSÔ0üý+,DÊu的Œþ/Õó產öÿÈÐÑ9iÖq×”裝置Z

â =T&/LI RN <7置‰<Àª‡ˆ-C：

• ‧ ÚŽnÛÜ[ÝÞLTEßàá3Sâ;ã‘äåÜ[Ræçèá3¥Äéêëìíî（ïðˆ•~ñòón±¥ÄèÔÕ%

• ‧ ÚŽnÛÜ[‘;ãSôcdõ;ãö÷ÑLTE

語音ÅøØù

À個Ø行J^OIRTMä與‹ÅGáP/‰)3,¦m的®¯Ôr/£業(Ù’

SRVCC KÚˆ符¸ 0;PP O TS//"/>2P語音HèΈb” 6"0j的Gi9F RN H的

IRTMä/‰)HI+,H的‹ÅGá/Fèº與重ªÛ·ÁJó™>‹ÅHè9

iÛ達>Gi/SRVCC 0;PP R16 „+,‹8OAB二DEPF設j-初ƒ‰¨Á]動

ÀFJ^‚£lØ行x作‚_`Hè9

ΈÜÝ·Þ½E/‹ÅGáJ^WßÁ 6"61 j/KÀ個Ø行J^HÐy的C個9Aß反

yà的K &PS45A 8SS定向áâ語音‹ÅHèÁÿº,{à IRTMäŽ9

IRTMäŽ/“的K£uÉ裝置Èuâ+,Mä“ÅOABÆDEPT/CÏâª的Ò

º電üýJ^w>¨Á¢°4ì=ã†Çiä的:段ÁÿOABÍDEP9語音‹Å的Hè

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Áÿóåæ@² IRTMäÁÿ/HèÁÿ的定çKb#TC個±² =T& +,4ä的語音UV

žìTèé/CÏâ語音¡™±² CS+,4ìiä的:段Áÿ9

ßÜÝÊu &ricsson êë的yu+,基礎7設‰)×載‹ìí的ÜÝ23/·Þ½E

語音‹ÅHèÁÿȸLI CS IRT FGC:8與 ;S8+,ÿMäÁÿ/‰)F¨ RT

H進行QîÏMä的Áÿ/F¨ RT H/RN óÊÅ£uÉ裝置ïAªîÏ9rÜâ的‹Å

HèÁÿ符¸ 0;PP b” 6"0j的Gi9

ùCF相’的Έi準K+,準³進行 SRVCC MäD3的Áÿ9:個ÁÿKuv裝置rÜ

°‹ð =T& †íÈuç–Ùèé/CÏâuv裝置ÈuMäÊÅ°+行MäJ^D±²的

Áÿ9ÎkMä準³Áÿçó£uÉ‹ÅHè/ñßÁÿ9)òœ²ˆóô =T& Èu†í

ÁÐÑ]動Mä作業/‰)óôÞ =T& †í`aÏç–×õTÜMäö÷9

Êu &ricsson êë的yu+,基礎7設‰)×載‹ìí的ÜÝ23D¶的ÜÝ·Þ½

E/Mä準³‰)作業J^Áÿ/ȸLI CS IRTFGC:8與 ;S8+,ÿ的MäÁÿ/

‰)F¨ RT H進行QîÏMä的Áÿ/F²JH RN óÊÅ£uÉ裝置ïAªîÏ/Mä

J^Ø均ßÁø 6"/j9

ãú

Vo=T&Fyà‘的 =T& +,OPH/iuv™š與wxy+,¥³Ò<dù的€09

FúÁZ[ =T& 與 Vo=T&的²J/SRVCC K=>與LI+,ÿ互‹的CF’“‡ˆ9

;S8 i=>>‡達>Gi/û與業(¸作‰=> Vo=T&) SRVCC Z[作業ü›C®†的7Šgî/進Q>ý+,與£uÉ裝置ÿ的互‹9

F互‹Ý的þ與ΈÜÝH/l·Þ½EÓ³ SRVCC 的 Vo=T&çW<行/:符¸語音

Hè與‹Å>ÿÇmnop的Έgî9

ùú/"LI+,的½¾K<‰掌‘的9Îk =T&3&PC3I8S ®¯3進行軟™¦m/ñ"

LI RN 的½¾IX/甚Aw&êIÐÑ/A”Y±Z[的 8SC-SWI`Z=3,¦m9

û˜]UüýSLTE語音技術演進的þº階段Sâÿ˜LTE0¬0®78ÅS¨©¶•V··的

VoLTE  S 已準©好朝Ú¯Œ部署的目標邁進‚

SRVCC between LTE and 3GPP2 1xCSBasics:

• 1xCS: The 3GPP2 legacy circuit switche sig!alli!g syste" as e#i!e i! 3GPP2 $%S00&2'0

• 3GPP SRVCC UE: A 3GPP SRVCC (E is a (E e!ha!ce #or I)S Ser*ice Co!ti!uity with theaitio!al (E ca+a,ilities such as SRVCC ,etwee! E'(TRA- a! 3GPP (TRA- a! . or,etwee! E'(TRA- a! 3GPP GERA- a! . or ,etwee! (TRA- /SPA a! 3GPP (TRA- a!3GPP GERA-%

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Concept:

or SRVCC'ca+a,le (Es the call is always a!chore at the VCC AS i! the 3GPP24s I)S% The 3GPP215CS I6S e!a,les a si!gle raio (E to co""u!icate i! +arallel ,oth with the source syste" a! thetarget syste"% ro" VCC +ers+ecti*e this "echa!is" "i!i"i7es the *oice ga+ ,y su++orti!g thetra!s+ort o# sig!alli!g #or esta,lish"e!t o# the target CS access leg while the ter"i!al is co!!ecteto the source PS access !etwor8%

Tra!s+ort o# 3GPP2 15CS sig!alli!g "essages #or +re+aratio! o# the CS access leg i! the target syste"

The S102 re#ere!ce +oi!t is use to co!*ey 3GPP2 15CS sig!alli!g "essages ,etwee! the ))E a!3GPP2 15CS I6S% These 15 CS sig!alli!g "essages are actually e5cha!ge ,etwee! the (E a! the

3GPP2 15CS I6S a! S102 is o!ly o!e li!8 i! the o*erall (E 15CS I6S tu!!elli!g +ath% 9! there"ai!i!g +ortio! o# the tu!!elli!g +ath the 3GPP2 15CS sig!alli!g "essages are e!ca+sulate i! E(TRA-.EPS tu!!elli!g "essages /(E ))E%

E-UTRAN and 3GPP2 1xCS SRVCC architectre

SRVCC architecture #or E'(TRA- to 3GPP2 15CS

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Ca!! "!o#s "or SRVCC "ro$ E-UTRAN

LTE VoIP'to'15 CS *oice ser*ice co!ti!uity

1% 9!goi!g VoIP sessio! o*er the I)S access leg esta,lishe o*er EPS.E (TRA- access%

2% 15CS SRVCC (E se!s "easure"e!t re+orts to e-oe%

3% The E (TRA- /e%g% ,ase o! so"e trigger "easure"e!t re+orts "a8es a eter"i!atio! toi!itiate a! i!ter tech!ology ha!o*er to c"a2000 15RTT%

&% The E (TRA- sig!als the (E to +er#or" a! i!ter tech!ology ha!o*er ,y se!i!g a a!o*er #ro"E(TRA Pre+aratio! Re;uest "essage%

<% The (E i!itiates sig!alli!g #or esta,lish"e!t o# the CS access leg ,y se!i!g a (L ha!o*er+re+aratio! Tra!s#er "essage co!tai!i!g the 15RTT 9rigi!atio! "essage% or the case o# e"erge!cy*oice ser*ice co!ti!uity the re;uest i!clues a Re;uest'Ty+e = >e"erge!cy ha!o*er> a! i! thecase o# (E o+erati!g i! Li"ite Ser*ice )oe the )EI? /e%g% I)EI is i!clue%

@% The E (TRA- se!s a! (+li!8 S1 c"a2000 Tu!!elli!g /)EI? RA-? 15 9rigi!atio! Re#ere!ceCellI? "essage to the ))E% The e-oe will also i!clue C?)A2000 9 Re;uire I!icatio! IE to(+li!8 S1 C?)A2000 Tu!!elli!g "essage which i!icates to the ))E that the ha!o*er +re+aratio!

has starte%

% (+o! rece+tio! o# the (+li!8 S1 c"a2000 Tu!!elli!g "essage the ))E selects a 3GPP2 15CSI6S ,ase o! Re#ere!ce CellI? a! e!ca+sulates the 15 9rigi!atio! )essage alo!g with the )EI? a!RA-? i! a S102 ?irect Tra!s#er "essage /as >15 Air I!ter#ace Sig!alli!g>%

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B% The tra##ic cha!!el resources are esta,lishe i! the 15 RTT syste" a! 3GPP2 15CS +roceures#or i!itiatio! o# Sessio! Tra!s#er are +er#or"e as +er 3GPP2 $%S00&2 &D%

% The 3GPP2 15CS I6S creates a 15 "essage a! e!ca+sulates it i! a S102 ?irect Tra!s#er "essage/15 "essage a!o*er i!icator% I# the 3GPP2 access was a,le to allocate resources success#ullythe 15 "essage is a 15 a!o*er ?irectio! "essage a! the ha!o*er i!icator i!icates success#ulresource allocatio!% 9therwise the ha!o*er i!icator i!icates to the ))E that ha!o*er

+re+aratio! #aile a! the e",ee 15 "essage i!icates the #ailure to the (E%

10% The ))E se!s the 15 "essage a! C?)A2000 9 Status IE i! a ?ow!li!8 S1 c"a2000Tu!!elli!g "essage to the E (TRA-% The C?)A2000 9 Status IE is set accori!g to the ha!o*eri!icator recei*e o*er the S102 tu!!el%

11% I# the C?)A2000 9 Status IE i!icates success#ul ha!o*er +re+aratio! the E (TRA- #orwarsthe 15 a!o## ?irectio! "essage e",ee i! a )o,ility #ro" E(TRA Co""a! "essage to the(E% This is +ercei*e ,y the (E as a a!o*er Co""a! "essage% I# ha!o*er +re+aratio! #aile?L I!#or"atio! tra!s#er "essage will ,e se!t i!stea with the e",ee 15RTT "essage thati!icates the #ailure to the (E%

12% 9!ce the (E recei*es the tra##ic cha!!el i!#or"atio! #ro" the c"a2000 15RTT syste" the (Eretu!es to the 15RTT raio access !etwor8 a! +er#or"s tra##ic cha!!el ac;uisitio! with the 15RTTCS access /e%g% 15RTT SS%

13% The (E se!s a 15RTT ha!o## co"+letio! "essage to the 15RTT CS access /e%g% 15RTT SS%

1&% The 15RTT CS Access se!s "essage to 15RTT )SC to i!icate o# ha!o## o!e% The resources,etwee! 15 CS I6S a! 15RTT )SC "ay ,e release at this ste+%

1<% 9!goi!g *oice call o*er the CS access leg esta,lishe o*er 15RTT access% The E (TRA-.EPSco!te5t "ay ,e release ,ase o! the !or"al E (TRA-.EPS +roceure%

1@% The e-oe se!s a! S1 (E Co!te5t Release Re;uest /Cause "essage to the ))E% Causei!icates the S1 release +roceure is cause ,y ha!o*er #ro" E'(TRA- to 15RTT%

1% The ))E e5cha!ges Sus+e! Re;uest. Ac8!owlege "essages with the S G6 . P G6% The S1'(,earers are release #or all EPS ,earers a! the GR ,earers are eacti*ate ,y the ))E% The !o!'GR ,earers are +reser*e a! are "ar8e as sus+e!e i! the S G6 . P G6% (+o! recei+t o# ow!li!8 ata the S G6 shoul !ot se! a ow!li!8 ata !oti#icatio! "essage to the ))E%

1B% S1 (E Co!te5t i! the e-oe is release as s+eci#ie i! TS 23%&01 2D%

1% or a! e"erge!cy ser*ices sessio! a#ter ha!o*er is co"+lete i# the co!trol +la!e locatio!

solutio! is use o! the source sie the source ))E shall se! a Su,scri,er Locatio! Re+ort carryi!ga! i!icatio! o# the 15RTT )SC /e%g% re#ere!ce cell I? to the G)LC associate with the source sieto su++ort locatio! co!ti!uity% This e!a,les locatio! co!ti!uity #or the 15RTT sie% Alter!ati*ely i# the co!trol +la!e solutio! is !ot use o! the source sie locatio! co!ti!uity +roceures shall ,ei!stigate o! the 15RTT sie%

SRVCC(Single Radio Voice Call Continuity)

 

SRVCC stands for Single Radio Voice Call Continuity. Putting it simple, it is a Handover technologybetween "VoP over !S in #$" and Voice Call %CS& in a legacy system %e.g, 'C(!)&. t means itis for Handover between a Pac*et call in #$ and a Circuit Call in a legacy system %'C(!)&.

#he simplest use model can be illustrated as in + Case - of the following figure showing theSRVCC between #$ and !#S %#he detailed mechanism would vary depending on what *ind of

legacy technology is involved&. ) little bit complicated use/model can be illustrated as in + Case 0

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-. n + Case 0 -, user is doing VoP while he is using another pac*et transaction %e.g, email,browsing etc&. n this case, the radio bearer on 'C(!) side should be a multiple Radio 1earer%CS 2 PS&. #here may be many different type of use model as well.

 

3verall procedure of SRVCC can be illustrated as follows. #his is not the e4act message se5uence.#his is 6ust to give you a big picture of the flow. #he e4act se5uence flow would vary depending

on what *ind of legacy technology gets involved.

 

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#hen you may as* "'hy do we need this *ind of technology when we already have Voiceimplementation in our #$ 7etwor* 8".

et9s thin* about this *ind of situation.

) networ* operator has !#S networ* covering all of its territory and it 6ust started deploying#$. 1ut #$ deployment is not complete yet to cover the whole territory. 7ow a subscriberstarted voice call via !S in the area with #$ networ*. )nd the it starts moving out of the #$coverage. 'hat would happen 8 f the simplest possibility would be that the call would drop. 1ut if the area is still strongly covered by a !#S networ*, you can have another option than dropping

the call. f you can hand the voice call over to the !#S networ*, you can maintain the call evenwhen you get out of the #$ networ*. #his is a ma6or motivation for SRVCC. 3f course, differentnetwor* opertor may have different motivation.

SRVCC Evolution

 

$ven though SRVCC is relatively old concept, don9t see this feature is such a widely deployed asof now %!ar 0:;&. )lso, the initial SRVCC mechanism is not so well optimi<ed especially in terms

of core networ* process. )s a result, even before it is widely spread, we already see a lot ofdifferent evolutions for this technology. =ollowings are some of the list we often hear as of now,but the list would get longer.

 

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Common 7ame >?PP Release (escription

1asic SRVCC Rel @Call Continuity from $/#R)7 to #R)7A?R)7

aSRVCC Rel :Pac*et switched to Circuit Switched call transfer during )lerting

eSRVCC Rel :

$nhanced SRVCC %Support for !SC Server assisted !id Call =eat

vSRVCC Rel Video SRVCC

rSRVCC Rel SRVCC from #R)7A?R)7 to $/#R)7

 

UE Capability Information for SRVCC : LTE RRC

t is hard to find clear indicator for SRVCC supportability and even though there are some optional

and indirect indictor, don9t see many $s properly set all those elements properly as of now %!ar0:;&. thin* it is because SRVCC is still an early stage of implementation.

=ollowing is nformation $lements of showing SRVCC supportability in $ Capability nformationmessage %>B.>> v0.:>&. )s you see, all of these $s are 3ptional and you may not see these $set even though $ support SRVCC.

 

=ollowing is part of =? %=eature ?roup ndicator& in $ Capability nformation which may giveyou some indirect indication for SRVCC Support. Since these fields are related to other features aswell, it is not guaranteed that $ support SRVCC even though all of the these fields are set to .

 

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!rotocol Se"uence E#ample $ % &a'ic SRVCCRel *

 

n terms of overal protocol flow, SRVCC is very similar to general Handover. 1ut going into detail,you may have some 5uestions. ou may as* how networ* *nows whether it has to initate SRVCCor general PS handover 8 or How $ *nows whether it should convert its !S call to CS %)!R& call

8 'hat would happen to the !SASP call after SRVCC 8 etc. n short, all these 5uestions areabout "(ecision !a*ing" process in $ and 7etwor*.

 

#he answer to these 5uestions may not be clearly stated in the specification and there might besome variations depending on 7etwor* 3perator9s re5uirement. 1ut you can ma*e some hints

from >B.;0>/ >.D.>.0 %$specially step : and ;&

 

& E #$ F RRC G PR)CH Preamble

0& E #$ F RRC G R)CH Response

>& E #$ F RRC G RRC Connection Re5uest

& E #$ F RRC G RRC Connection Setup

D& E #$ F RRC G RRC Connection Setup Complete

2 7)S G )ttach Re5uest 2 $S! G P(7 Connectivity Re5uest

;& E #$ F RRC G ( nformation #ransfer 2 7)S G )uthentication Re5uest

B& E #$ F RRC G nformation #ransfer 2 7)S G )uthentication Response

I& E #$ F RRC G ( nformation #ransfer 2 7)S G Security !ode Command

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@& E #$ F RRC G nformation #ransfer 2 7)S G Security !ode Complete

& E #$ F RRC G Security ! ode Command

:& E #$ F RRC G Security !ode Complete

& E #$ F RRC G $ Capability $n5uiry

0& E #$ F RRC G $ Capability nformation

>& E #$ F RRC G RRC Connection Reconfiguration

2 7)S G )ttach )ccept 2 7)S G )ctivate (efault $PS 1earer Conte4t Re5

D& E #$ F RRC G RRC Connection Reconfiguration Complete

2 7)S G )ttach Complete 2 7)S G )ctivate (efault $PS 1earer Conte4t)ccept

;& E #$ F + $ Perform !S Registration -

B& E #$ F + !a*e a VoLTE Call and Voice #raffic flows as a SP traffic -

I& E #$ F + $ !ovies nto 'C(!) region which would trigger SRVCC -

@& E #$ F RRC : +obility ,rom EUTR- Command

& E'C(!)F RRC : .-/01VER To UTR-/ Complete

0:& E'C(!)F RRC G Security !ode Command

0& E'C(!)F RRC G Security !ode Complete

00& E'C(!)F RRC G #R)7 !obility nformation

0>& E'C(!)F RRC G #R)7 !obility nformation Confirm

0D& E'C(!)F ?!! G Routing )rea pdate Re5uest

0;& E'C(!)F ?!! G )uthentication )nd Ciphering Re5uest

0B& E'C(!)F ?!! G )uthentication )nd Ciphering Response

0I& E'C(!)F RRC G Security !ode Command

0@& E'C(!)F RRC G Security !ode Complete

0& E'C(!)F ?!! G Routing )rea pdate )ccept

>:& E'C(!)F ?!! G Routing )rea pdate Complete

>& E'C(!)F + Voice Call would redirected from #$ to 'C(!) CSA)!R 1earer -

>0& E'C(!)F + )ny non/voice P traffic may redirected to 'C(!) Pac*et 1earer -

 

@& E #$ F RRC G !obility =rom $#R) Command

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#his is pretty complicated message. #his message triggers $ switch to 'C(!) and inform $ ofall the radio bearer setup information to perform CS voice call %and, depending on situation, radiobearer setup for pac*et data as well&

• +e''age E#ample

)mong the long list of the RRC message, probably the following two components %especially thefirst item %tem :& will be the critical factors to inform $ on whether it has to do PS handover orSRVCC.

rab/nformationSetupistG 0 items

  tem :

  R)1/nformationSetup/r@

  rab/nfo

  rab/dentityG gsm/!)P/R)1/dentity %:&

  gsm/!)P/R)1/dentityG : Ebit length @, :::: ::: decimal value F

  cn/(omaindentityG c'%domain %:&

  re/$stablishment#imerG use#>D %:&

 

tem

  R)1/nformationSetup/r@

  rab/nfo

  rab/dentityG gsm/!)P/R)1/dentity %:&

  gsm/!)P/R)1/dentityG :; Ebit length @, :::: :: decimal value ;F

  cn/(omaindentityG ps/domain %&

  re/$stablishment#imerG use#>; %&

 

& E'C(!)F RRC G H)7(3V$R #o #R)7 Complete

 

f Handover %SRVCC& is successful, $ send Handover to tran Complete message from 'C(!)Cell.

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• +e''age E#ample

 

!rotocol Se"uence E#ample 2 % a SRVCCRel $3*

 

& E #$ F RRC G PR)CH Preamble

0& E #$ F RRC G R)CH Response

>& E #$ F RRC G RRC Connection Re5uest

& E #$ F RRC G RRC Connection Setup

D& E #$ F RRC G RRC Connection Setup Complete

2 7)S G )ttach Re5uest 2 $S! G P(7 Connectivity Re5uest

;& E #$ F RRC G ( nformation #ransfer 2 7)S G )uthentication Re5uest

B& E #$ F RRC G nformation #ransfer 2 7)S G )uthentication Response

I& E #$ F RRC G ( nformation #ransfer 2 7)S G Security !ode Command

@& E #$ F RRC G nformation #ransfer 2 7)S G Security !ode Complete

& E #$ F RRC G Security ! ode Command

:& E #$ F RRC G Security !ode Complete

& E #$ F RRC G $ Capability $n5uiry

0& E #$ F RRC G $ Capability nformation

>& E #$ F RRC G RRC Connection Reconfiguration

2 7)S G )ttach )ccept 2 7)S G )ctivate (efault $PS 1earer Conte4t Re5

D& E #$ F RRC G RRC Connection Reconfiguration Complete

2 7)S G )ttach Complete 2 7)S G )ctivate (efault $PS 1earer Conte4t)ccept

;& E #$ F + $ Perform !S Registration -

B& E #$ F + nitiate a VoLTE Call -

I& E #$ F SP G 7V#$

@& E #$ F SP G :: #rying

& E #$ F SP G @> Session Progress AA #his is the trigger for 7' to establish(edicated $PS 1earer

7/18/2019 STN-SR for SRVCC.docx

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0:& E #$ F SP G PR)CJ

0& E #$ F SP G 0:: 3J

00& E #$ F + (edicated $PS 1earer Setup -

0>& E #$ F SP G P()#$

0D& E #$ F SP G 0:: 3J

0;& E #$ F SP G @: Ringing  AA #his is the trigger for 7' to initiate SRVCC

0B& E #$ F SP G PR)CH

0I& E #$ F SP G 0:: 3J

0@& E #$ F RRC : +obility ,rom EUTR- Command

0& E'C(!)F RRC : .-/01VER To UTR-/ Complete

>:& E'C(!)F RRC G Security !ode Command

>& E'C(!)F RRC G Security !ode Complete

>0& E'C(!)F RRC G #R)7 !obility nformation

>>& E'C(!)F RRC G #R)7 !obility nformation Confirm

>D& E'C(!)F ?!! G Routing )rea pdate Re5uest

>;& E'C(!)F ?!! G )uthentication )nd Ciphering Re5uest

>B& E'C(!)F ?!! G )uthentication )nd Ciphering Response

>I& E'C(!)F RRC G Security !ode Command

>@& E'C(!)F RRC G Security !ode Complete

>& E'C(!)F ?!! G Routing )rea pdate )ccept

D:& E'C(!)F ?!! G Routing )rea pdate Complete

D& E'C(!)F + Voice Call would redirected from #$ to 'C(!) CSA)!R 1earer -

D0& E'C(!)F + )ny non/voice P traffic may redirected to 'C(!) Pac*et 1earer -