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T3UC 2012 Bangalore, India 12-13 June, 2012

© ETSI 2011. All rights reserved

IMS voice conformance test over T! !TSIST"1#0

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IMS voice conformance testover T!

The ProjectSupport of Voice in LTE

• Voice options in LTE

• SRVCC Architecture• SRVCC call Message flow

• Test Model Enhancements for IMS

The EperienceConclusions

2 © ETSI 2011. All rights reserved

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T$! %&'J!CT


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3(%% U! conformance test)1*2+

Mo!ile terminal conformance is one of the "e# issues in the mo!ileindustr#$ impacting interopera!ilit#%

&'PP RA() and 'ERA(& are responsi!le for *E conformance test

specifications

A tas" force ST+,-. under TS' RA(/RA() de0elops$ maintains$

deli0ers the &'PP *E test suites in TTC(

1nl# these TTC( test cases produced at ETSI are 0alid for the *E

certifications

Applied !# certification !odies li"e 'C+$ PTCR2

ETSI CTI pro0ides to &'PP the ST+ leadership and management of all

&'PP TTC(3related matters

The ST+ has ,4 eperts from ETSI$ CCSA and ATIS• The largest testing project supported !# ETSI

+unding 5. mm / #ear

• &'PP funding )4 mm 67)8" Euro9

• Voluntar# contri!utions &: mm as man power$ free3of3charge from T;IA

and other &'PP companies4

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3(%% U! conformance test )2*2+

*E conformance test co0ers se0en technologies< LTE$ =3C;MA$ T;3SC;MA$ 'SM/'PRS$ IMS$ C;MA:... and inter3technolog# mo!ilit#

and roaming• +or all mo!ile de0ices and modules

• +or all &'PP/&'PP: fre>uenc# 2ands

• +or 7 &'PP Releases 6Rel35 3 !ac"wards to R559

The team maintains ::.. test cases$

;e0elops :.. new test cases / #ear

Pro0ides ,: deli0eries / #ear

2aseline upgrade once per #ear

MCC T+,-.< Signalling Conformance Tests for &'PP 6RA()< Testing9

• Tas"< ;e0elop Conformance Test Suites for *E world3wide certification• :...%%now Conformance Tests for *MTS Signalling +;;/T;;

6TTC(3:??9 6Rel355 %%% Rel59

• :..-%%now Conformance Tests for IMS 6TTC(3&$ !earer agnostic9• :..7%%:..4 Pre3e0aluation of TTC(3& for LTE Signalling• :..4%%now &'PP LTE/SAE *E Conformance Test@Rel4 Rel5B• :.,,%%now IMS Emergenc# Call/ SRVCC calls in LTE/SAE3

*TRA(/'ERA(/C;MA 1XRTT

© ETSI 2011. All rights reserved5

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T!*S! %roect

Test cases< &5& Verified? 7) LTE/SAE ? &5 Positioning full# implemented

-,& test cases planned @Rel 4 Rel 5B

,:.? planned for IMS

Code siDe<

• :-& Modules

• App% :8. Lines of code 6TTC(3&9

T#pe ;efinitions

• TTC(3&< &, modules$ App% &. lines of code

• AS(%,< 4 modules $ App% ). lines of code

• FML< G (ot #et used

Tools<• - different compilers 6all a0aila!le at ETSI9

• Hualit# chec"s 6naming con0entions$ template restrictions etc%9

• Code generation 6top3le0el test case definitions$ parameters$ etc%9

• Code anal#sis 6structure$ appro0ed o!jects9

TTC(3& code is freel# a0aila!le for &'PP mem!ers and widel# used

http

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Com.onent Structure )1*3+

MTC• Start of PTCs$ monitoring of JdoneK and J"illedK• RAT independent interfaces 6e%g% AT3/MMI3commands to

control the *E9

• In general no pass/fail 0erdicts

PTCs for each RAT 6radio access technolog#9• LTE$ *MTS$ 'SM/'PRS$ C;MA:...• Ma# !e connected to an# other RAT PTC• 1nl# RAT specific interfaces• Assignment of pass/fail 0erdicts

Ports and interfaces• Connections< onl# one3to3one

6 no Jsend toK$ Jrecei0e fromK no use of address datat#pe9

• (o duplicated interfaces< e%g% onl# one interface for AT3/MMI3commands hosted !# the MTC

• Message !ased communication onl#© ETSI 2011. All rights reserved7

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PTCs for other protocols IP PTC

• IP data 6e%g% ;CP$ ICMP0-9 handling

• To "eep s#stem interface simple and deal with Jparallel !eha0iourK

• In general no test characteristic 6 no pass/fail 0erdicts9

• Possi!ilit# to pro0ide non standard test specific !eha0iour !# routing the IPmessages to E*TRA PTC% Test characterisitic 6 pass/fail 0erdict allocations9

• More than one instances possi!le% 1ne instance per P;(

IMS PTC

• 2# default pro0ides generic IMS SIP Registration and deregistration

• Pro0ides *;P/TCP transport of IMS SIP signalling messages

• In general no test characteristic 6 no pass/fail 0erdicts9

• Possi!ilit# to pro0ide non default$ test specific !eha0iour

• More than one instances possi!le< one instance per P;(

• (AS Emulator • Jprotocol la#erK underneath LTE PTC

• Performs (AS securit# 6Ciphering/Integrit#9 with the help of eternal functions


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9Sste! I"ter#$%e

E&S'SI() E&)R*E&S'S E&SR*

E+TRA ,T-/TE

(AS E!l$tr

-TR/ T-&SR*

S'S&SR*

S'SI() )R*S'S (AS-TR/ SR*

+ T R A (

3 E R A (

T

-

+t

+t

3&

+ t

+&

+ t

+ T

E

& + t

+TRA( ,T-

- 2 5&

+ t

ERA( ,T-

-)A2 ,T-

+TRA( ,T-

ERA( ,T-

-)A2 ,T- - 2

5

Coordination

*pper Tester

6AT $ MMI9

Configuration

Signalling

*ser ;ata

(on &'PP/IMS Protocol

, r e 6 R e g

-)A2 ,T-

I,&,T-

IS&,T-

IP_SOCK

IP_SOCK

IP_Data

IP_Data

SIP_Clnt/Srv

SIP_Clnt/Srv

+X

I,&-TR/

I,&-TR/

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SU%%'&T '" /'IC! I T!


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/oice o.tions in T!

LTE is an all pac"et technolog# supporting Pac"et switched domain onl#Support for Voice is still a necessit#• Regulator# re>uirements present for support of 0oice call @emergenc# callsB• In the age of smart phones$ 0oice still accounts for ,)N of mo!ile traffic%

CS+2 is &'PP endorsed initial 0oice support$ commerciall# launched in :.,,%• LTE networ"s are deplo#ed alongside legac# 0oice networ"s @*TRA(/'ERA(/C;MA

,RTTB

• *E will !e handed o0er or redirected to the legac# 0oice RAT when Voice ser0ice isneeded• Increases call esta!lishment time !# ) to 4 seconds%

SRVCC is net logical step after CS+2 in LTE road map• *E while camping in LTE uses IMS @VoLTEB for 0oice• Core networ" on !oth sides will !e connected and s#nchronised%• Allows single Radio in *E to !e handed o0er from VoLTE to legac# CS domain

*TRA(/'ERA(/,FRTT ando0er in opposite direction is still not standardised%

• Pro0ides a seamless 0oice eperience to customers using LTE multi mode handsetsSome operators going for non &'PP endorsed technologies$ for eample SVLTE• *E will !e simultaneousl# camping on LTE networ" for data and some 0oice technolog#

@e%g% ,RTTB for 0oice%

• (o need for core networ"s to !e connected and s#nchronised• : *EOs put in one plastic case


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S&/CC call Message o )1*2+


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S&/CC call Com.leit4

Re>uires MTC and at3least ) PTCS @E*TRA$(AS Emu$ IP$ IMS and one of target RAT PTCOsB• Co3ordination !etween - components% @;oes not

considers multiple instances of IP and IMS

components for multi P;( networ" simulationsB• Signalling handled !# these components will !epartiall# independent with start and stop points$s#nchronised with signalling in other components%

• Simple and ro!ust inter component co3ordination

message protocol desired% and sha"e signals aremostl# sufficient configura!le RAT specificinformation also needs to !e shared occasionall#%

• Re>uires test case specific !eha0iour for IMSPTC$Verdict assignment in IMSPTC%


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"uture IMS etensions

Tests for Video calls o0er LTE⇒re>uires additional !earer for 0ideo%

⇒ re>uires additional IMS profiles%

Tests for IMS Voice call o0er SPA 6PS domain9 and its

hando0er to CS domain in *TRA( or 'ERA(

⇒Similar compleit# as SRVCC LTE⇒IMS o0er SPA@*TRA( !earerB re>uired

Tests for support of IMS VoLTE call hando0er to VoSPA and

0ice 0ersa%

⇒More IMS SIP signalling o0er SPA after hando0er for call

release/de3registration⇒IMS !earers for 0oice to !e supported !oth in LTE and SPA

IMS Emergenc# call o0er LTE and SPA

⇒(eeds multiple P;( connections$ hence multiple instances of IMS

PTC%

Test model needs to !e read# for these test re>uirements© ETSI 2011. All rights reserved14

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Test Model !n5ancements forIMS 61*27


+unctionalit# in dar" green added new 1ther functionalit# also enhancedSigComp is not re>uired for VoLTE$ !ut ma# !e used for IMS o0er *TRA(

It ma# !e re>uired in future to add SigComp

I, & -TR/

-TR/-TR/

I,&S-

I, )$t$S%et -trlSystem Interface

I,&S-

E+TRA:-ell; )R*

r$< !de I, !de

E+TRA&,T-

I,&,T-

Sste! Ad$=tr

I, st$%

)R*+X Rti"g T$>le

I,&-TR/

+TRA(:-ell; R*

+X?@ilter

I,)$t$

S%et-"trl

Soc"et Ctrl

I,)$t$Soc"etCtrl

ERA(

RoutingCtrl

Rti"g-"trl

I,&-TR/

SI, %lie"tse%

SI, server se%

-"trl

IS I, -TR/

SI, %lie"tse%

SI, server se% IS I, -TR/

IS&,T-

I,se%: SA) S,)

Securit#Ctrl

I,se%&-TR/

I,se%&-TR/

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Test Model !n5ancements forIMS 62*27

Test case specific IMS PTC• Pro0ides test case specific IMS !eha0ior%• andles default IMS registration

• CustomiDed SIP signaling for IMS 0oice call%

• Assigns 0erdicts

• SIP codec achie0ed !# TTC( & !uilt in functions enc0alue/dec0alue

• Sigcomp not handled #et%Enhancements to IP PTC

• Added functionalit# for ;CP/;(S and other IET+ protocols during IMSregistration

• Enhance IP control for configuring Ipsec in SS IP stac" emulation

• Routing/recei0ing of SIP P;*Os to/from IMS PTC !# Mu/+ilter

• Enhanced routing%

Enhancements in SS adaptor

• Ipsec handling$ configuration of securit# polic# data!ase 6SP;9 andsecurit# association data!ase 6SA;9 securit# parameters

• Possi!ilit# to map IMS !earers on *TRA( !earers 6VoSPA9

Additional inter component co3ordination ports and messages© ETSI 2011. All rights reserved16

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T$! !8%!&I!C!


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MCC1#0 !.erience 61*27

ETSI MCC T+,-. is one among few teams simultaneousl# using TTC(: and

TTC(& for ATS de0elopment%• The onl# ETSI team still using TTC(: for historical reasons

Language e0olution Tool support

• TTC(:?? froDen in Ma# ,555$ with negligi!le tool enhancements$ seems to ha0eeceeded its use !#O period%

• TTC( & enjo#s en0ia!le language/tool enhancements and maintenance

're# areas in spec• 're# areas 6too late to clarif# the standards9 with different understanding across tool

0endors$ pre0enting such features usage%

⇒ ISPRESE(T$ !eha0ior with omitted contents $ pointing to a list of elements etc%

• (o such issues with TTC( & due to acti0e language and tool support⇒ MCC ,-. acti0el# pro0ides such feed !ac"$ resulting in clarification in standards and

enhancements of tools%

+ied Mo!ile con0ergence<

• Industr# is !uDD with fied mo!ile con0ergence$ re>uiring man# IP !ased IET+protocols @;CP/;(S/ICMP/SigComp/IPSecQB support in wireless networ"s

⇒ TTC( : IP !ased code getting unreada!le with too man# octet strings and local trees%

⇒ Similar code is 0er# simple in TTC( &%

⇒ A!sence of !uilt3in functions li"e enc0alue/dec0alue in TTC( :$ pro0ing costl# re>uires man#

TS1Os to !e defined


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MCC1#0 !.erience 62*27

Increased code SiDes• Tests from 7 releases @Rel55$ Rel8$ Rel)$QRel5B$ pro0ing too much for decade oldTTC( : compilers to handle%

⇒ Import ta!les o0erhead !ecoming more than the actual code siDe%

⇒ igher the release$ se0ere the pro!lem due to modular structure for de0elopment%

⇒ Resulting in huge$ un managea!le modules

⇒ Compilation and code generation is 0er# time consuming

• TTC( & tools seem to enjo# immunit# against such code epansion⇒ Integration of IMS with LTE was smooth%

⇒ Import of a module in TTC(& is one line with import allO option%

⇒ -."@:..5B 3 :8." @:.,:B TTC( & lines of code%

⇒ 5.@:..5B3 :-&@:.,:B modules

⇒ & @:..5B3-?@:.,:B acti0e components in a test case

⇒ (o "nown compiler complains

Proposal to mo0e *TRA( Rel,. and later test de0elopment from TTC( : toTTC( & possi!l# to also port eisting TTC(: Rel7 and later tests to TTC( &%

• ;iscussion decision to !e made in RA() )) meeting in Ma# :.,:


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C'CUSI'S


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Conclusions 61*27

Regulator# re>uirements for support of 0oice commercial need forinteropera!ilit# with legac# CS 0oice ser0ice$ contri!uted in most

challenging enhancements in test model and coding MCC T+,-.

wor"ed on till date%

Integration of IMS in LTE$ !rought along with its challenges of

handling man# fla0ors of IMS implementations%

TTC( & Roc"s

• 1nce again TTC( & pro0ed to !e a good choice !# pro0iding competentlanguage frame wor"$ to o0ercome all challenges in integrating IMS with

LTE%• E0en though there is still no formal 0erification of IMS in LTE$ we do ha0e informal claims of

good progress !eing made Initial IMS registration performed successfull#%

• Successfull# demonstrated co3ha!itation of se0en technologies<LTE@+;;/T;;B$ =3C;MA$ T;3SC;MA$ 'SM/'PRS$ IMS$ C;MA RP;/,FRTT

• Acti0e TTC(& language and tool support is en0ia!le%

• Hualit# chec" tools$ mar"ing appro0ed o!jects from rest are icing on theca"eO


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Conclusions 62*27

The successful integration of IMS with LTE$ further moti0ates toharmoniDe the IMS code and test model eisting in : MCC ,-.

projects<

⇒the IMS conformance testing 6&8%::53&9 and

⇒the IMS re>uired for VoLTE 6&-%):&3&9%

• Challenge for second half of :.,:%

• MaimiDe code reuse in terms of shared modules$ hence code s#nerg#%• Speeds new test case de0elopment due to code s#nerg#%

• 2oon for maintenance and enhanced >ualit#%

• Targets harmoniDation of Test Model

• Re>uires new pro# TTC( & modules for primiti0e mapping

•Re>uires further enhancements for Sigcomp$ FCAP%


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T$9 :'U


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SUT

Test S4stem


Host PCSystem SimulatorHW

complex confuration!elay o" messaesno matter #$at testpurpose is

U%

R@

AT?I

Test E;e%t$>le

sste!

s=e%i#i%Sste!?

,l$t#r!

Ad$=tr

-de%

⇒ e.g. reire!e"ts reg$rdi"g re$lti!e >eh$vir #r Sste! Si!l$tr $"d TT-(3 %de

Test -"trl

/ggi"g

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S&/CC &eference rc5itecture

Architecture for E*TRA to *TRA(/'ERA( considered% Similar for E*TRA( to C;MA ,FRTT%MSC ser0er is enhanced for SRVCC

D2 PPT 1_Abdul

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