Version

03.00

July

2007

¸CMU200 Universal Radio Communication TesterTesting Applications in Mobile Radio Communications

Ethernet RF

HTTP

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Vide

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FTP

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Services

TCP / UDP

IP

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Physical layer

Applications

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Ether- net

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TCP / UDP

IP / PPP / ...

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IP

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PDCP / RLC / MAC

Physical layer

� ¸CMU 200 Applications

¸CMU200 goes Internet: testing data applications

The highly successful R&S®CMU200 uni-versal radio communication tester, which was originally designed as a pure RF tester for the various mobile radio standards used around the world, now enables addition-al user groups to test voice and video tele-phony as well as applications based on the Internet protocol (IP), such as web browser

or file transfer.

Becauseoftheincreasedtransmissionratesandenormouscomputingpowerofmodernmobilephones,developersandmanufacturersarefacedwithnewtestrequirementsduetothewealthofnewapplications.

Bymeansofawiderangeoftests,the¸CMU�00supportsapplicationsbasedoncircuit-switchedconnections,suchasshortmessageservice(SMS),traditionalvoicetransmission,ormodernvideotelephony.ThesameappliestoIP-data-basedapplicationsonthebasisofpacket-switchedconnections.

Appealing compact solution

Bothdevelopingandprovidingdataap-plicationsformobileradiopresentamul-titudeofnewchallenges.Mostapplica-tionsindatacommunicationsarebasedontheInternetprotocol(IP),whichinturnisbasedontheclient-serverprinci-ple.Thismeansthataclientusesamo-bilephonetorequestservicesthatareprovidedbyaserverinthecommunica-tionsnetwork.ThesoftwarefortheseapplicationsisusuallydevelopedonPCs;afteritsimplementationandextensivecomputersimulations,thesoftwareisportedtothemobilephone.Toperformfurthertestsonthemobilephoneitself,apublicmobileradionetworkorthesim-ulationofsuchanetworkisrequired.

Uptonow,radionetworkscouldusu-allybesimulatedonlywiththeaidofcomplexsetups.ThisisremediedbytheR&S®CMU�00,whichisaveryinterest-ingalternativeforsuchtasks.Duetotheextensivepossiblesettingsitoffers,testscanalsobeperformedonfrequencybands,forexample,thatarenotneces-sarilypartofanavailablepublicradionetwork.

Beforecommunicationsservicescanbelaunchedonthemarket,networkopera-torsmustsubjectthemtointeroperabilityteststoensurethattheyoperatesmooth-ly.Withthemultimediamessageservice(MMS),forexample,thecorrectexchangeofmessageswiththeserverimplemen-tationinthenetworkorbetweenmobilephonesfromdifferentmanufacturersischecked.Moreover,makingobjectivecomparisonsunderuser-definableandrandomlyreproducibleoperatingandtestconditionsisanotherpivotalfunctionthistargetgroupneeds.

Test setup

Applicationtestsetupsbasicallyconsistofamobilephone,theR&S®CMU�00,andaPC.Themobileradiotester,whichisconnectedtothemobilephoneviatheradiointerface,simulatesthemo-bileradionetwork.ViaanEthernetcon-nection,itaccessestheIP-basedcom-puterworld,whichcanbeeitheralo-calareanetwork(LAN),theInternetor,atitssimplest,acontroller,wheretheserversprovidingthecommunica-tionsservicescanbeaccessed.Theus-erusuallyaccessestheseservicesfromthemobilephoneviamobileoriginatedcalls.TheR&S®CMU�00bridgesthegapbetweenwireddatacommunicationsandradiocommunicationsacrossvariousprotocollayers.

¸CMU 200 Applications �

Versatile test scenarios

Go/NoGotestsstartanapplicationonthemobilephoneandtesttheoperationfromtheuser‘sviewpoint.ThesetestsdifferfromRFmeasurementsperformedwiththeR&S®CMU�00bycoveringtheentireoperatingsystemofaphoneandsubjectingittotheappropriatestress.Afteranapplicationpassesthisbasictest,performancemeasurementsareusuallycarriedout;theiraimistoana-lyzetheachievabledatatransmissionratesinthedownlinkandtheuplink.

Networkoperatorsoftenrequireproofthatminimumdataratesareachievedunderspecificconditions.The¸CMU�00allowssuchconfirmation.

Anothernoteworthycriterionthathelpsdeterminethepracticalvalueofmo-bilephonesistheiroperatingtimewithrechargeablebatteries.Tominimizeaphone’spowerconsumption,youneedtomeasuretheconsumptionwhileanappli-cationisactivesothatyoucanfindoutmoreaboutpossibleoptimizationproce-dures.Ifrequired,themobileradiotestersimultaneouslyrecordsdetailedinforma-tionabouttheprocessedprotocollayersinalogfile,whichisthenavailableforfutureevaluationandanalysis.

Interactiontestsanalyzehowdifferent,simultaneouslyactiveapplicationsonamobilephoneaffecteachother.Thesetestsanalyze,forexample,whatwillhappenifanSMSarriveswhileavideoisbeingdownloadedandthecalendarfunctionisoutputtinganalarm.

Interoperabilitytestscheckwhethermo-bilephonesfunctionsmoothlywithinanetwork,forexamplewheninteractingwiththenetworkoperator’sMMSserv-er,orwhentwophonesfromdifferentmanufacturersinteractwitheachoth-er.Inthesimplestcase,justonephoneisusedintheechomodetoperformacombinedtransmission/receptiontest.

Forthistest,anMMSisgeneratedonthemobilephoneandthensentbacktothesamephoneiftheoriginatingphonenumberisenteredattransmittal.Beforeanewmobilephonereachesthemarket,itmustundergoanumberofteststoen-surethatiscustomer-ready.IntheEMCtest,forexample,thetelephonemustoperatereliablyinthelabduringsimul-taneoustransmissionandreceptionofdataandremainlargelyunaffectedbystrongelectromagneticfields.

Whenthe¸CMU�00iscombinedwiththe¸ABFSfadingsimulator,theoperationofamobiletelephoneun-dervariousfadingscenariossuchasinanautomobileatvariousspeedsandre-ceptionconditionscanbesimulated.Thus,thereliabilityofdataexchangecanbetestedandevaluated.

Incontrasttoapracticaltestinapublicmobileradionetwork,the¸CMU�00makesitpossibletoindividuallydefineallradioparametersas,forexample,fieldstrengthorchannelcoding,andtorepeatthemasoftenasdesiredatanytime.Theperformanceofdifferentmo-bilephonesorimplementationscanthusbeobjectivelyevaluatedandcomparedinbenchmarktests.

TCP/IP services

Theclientsonthemobilephonerequiresuitableserversatthecontrollerendasacounterpartforapplicationtests.TheR&S®CMU�00applicationtestingop-tionsallowIP-baseddataapplicationstobetestedonamobilephone;inad-dition,theyincludeseveralTCP/IPserv-ers,forexampleanHTTPserver,whichallowsyoutostartawebbrowseronamobilephone.

Rohde&Schwarzoffersadditionalprod-uctsfordevelopingandcertifyinganum-berofmobile-phone-specificapplica-tionssuchasMMSorpush-to-talkovercellular(PoC).TheMMScenter(MMSC),astandard-conformingserver,allowsthebasefunctions,i.e.transmittingandre-ceivingmultimediamessagesonmobilephones,tobetested.The¸CA-AA0�and/or¸CA-AC0�optionsfromRohde&SchwarzverifyifaPoC-capablemobilephoneperformsinaccordancewiththestandard.

Future prospects

Applicationtestsarebecomingmoreandmoreimportantinmobileradio.Rohde&Schwarzismeetingthistrendbycontinuouslydevelopingnewsolu-tionsinthisfield.Thelicensingauthor-itieshaverespondedtochangesinthewaymobilecommunicationsareused:Bydevelopingtestscenarioswithexactspecifications,theydefineappropriatetestsattheapplicationlevelthatwillen-surethatmobileradionetworkswillalsooperatesmoothlyinthefuture.

� ¸CMU 200 Applications

Versatile application tests in (E)GPRS mobile radio

The ¸CMU-K92 software option allows you to test applications for 2.5G mobile phones. For example, you can now test the transmission or reception of multimedia message services (MMS), Internet brows-ing, or video streaming within a simulated (E)GPRS network environment. In addition to measuring the known RF parameters of power, spectrum or modulation, you can now also perform such tasks as displaying

data throughput or analyzing protocols.

Recording of all exchanged IP data packets with time stamp and display of the data transmission rate achieved.

Throughput of IP data exchanged between mobile phone and radio network in uplink (UL) and downlink (DL).

(E)GPRS application tests with the ¸ CMU200

Owingtosignificantprotocolstackex-tensions,the¸CMU�00alsoallowsyoutotestapplicationsviaGPRSandEGPRS(EDGE)mobilephonessimplybyactivatinganewsoftwareoption.The¸CMU-K9�softwareoptionmakesitpossibletotestalmostanyIP-basedap-plicationsinpacket-orientedmodeviaanIPgateway.Youcansimplytestproperfunction-ing,butalsocheckwhetherdifferentapplicationsthataresimultaneouslyac-tivatedonamobilephonerunsmoothly.

GPRSandEGPRS,theoffshootsoftheGSMstandard,achievedatatrans-missionratesofupto171.�kbit/sand�7�.6kbit/srespectively,thusallowingamultitudeofapplicationstobecarriedout,someofthemevenwithrealtimere-quirements.InadditiontodisplayingthecurrentdatathroughputoftheIPpack-etsexchangedbetweenmobilephoneandserver,theR&S®CMU�00alsore-cordsvarioustransmissionprotocols.Designengineersarethusabletothor-oughlyanalyzenotonlytheIPprotocol,butalsoanumberofotherradio-spe-cificprotocolssuchasradiolinkcontrol(RLC)ormediumaccesscontrol(MAC).Regardlessoftheseactivities,itisstillpossibletomeasureandanalyzetheRFsignalstransmittedbyGPRSorEGPRSmobilephonesontheR&S®CMU�00withrespecttopower,spectrum,ormodulation.Unliketheprevioustrans-mittertest,themeasurementisnowper-formedaspartoftheapplicationdatatransmissionandnolongerontheba-sisofpseudo-randombinarysequenc-es(PRBS).IftwoR&S®CMU�00testersareavailable,theapplicationtestscanbeexpandedtoaccommodatedataend-

to-endtests,forexampleforcheckingtheexchangeofanMMSmessagebe-tweentwomobilephones.IfonlyoneR&S®CMU�00isavailable,thetransmis-sionandslightlydelayedreceptionofanMMSmessagewithonemobilephonecanalsobeimplementedusingtheloop-backsettingintheMMSC.

Automation

Toreducestaffcosts,repetitivetestrou-tinessuchasbenchmarktestscanbeautomated.Byusingacontrolprogram,allsettingsrequiredforautomationcanbeautomaticallymadeviastandardizedinterfaces.Measurementresults,e.g.datathroughput,arerecorded.

¸CMU 200 Applications �

Powerful aid in the development lab

TheR&S®CMU-K9�softwareoptionfortheR&S®CMU�00allowsapplicationde-signengineerstotesttheirworkinthelabonmobilephonesinasimulatedra-dionetwork.Inthiscase,themainfo-cusisonprovingthattheapplicationrunssmoothlyonthemobilephoneundernor-maloperatingandradioconditions.Fortheseapplications,whichcanbedivid-edintomobile-originatedandmobile-ter-minatedapplications,thisrepresentsthefirstrealistictestaftercompletionofthesimulationtestsonthedevelopmentcom-puter.Whentestingmobile-originatedapplications,datacommunicationisini-tiatedonthemobilephone,forexam-plebycallingupanintegratedbrowserwithsubsequentaccesstothedataofawebserverconnectedviatheEthernetin-terfaceoftheR&S®CMU�00.Anexam-pleofatestofamobile-terminatedap-plicationisanSMStransmission,eitherfromacomputerconnectedtothetesterordirectlyfromthetestertothemobilephone.

Future prospects

The¸CMU-K9�optionistheplat-formforfurtherapplicationtests.ItisrequiredinordertorunvalidatedMMStestcasesortotestcomplexapplicationssuchaspush-to-talkovercellular(PoC).Intheforthcomingconfigurations,dataapplicationscanalsobetest-edwhilevoicetransmissionisinprog-ress.Iffeasiblewiththemobilephone,bothapplications(circuit-switched/packet-switched)canthenbeoperatedandtestedsimultaneouslyinthedualtransfermode.

A test setup for an end-to-end test between two mobile phones for testing for problem-free MMS exchange between mobile phones from different manufacturers, for example.

The ¸CMU 200 can also measure spectra, power, and modulations. Here is an example of a power measurement during a file transfer with four slots in the uplink and triggering in response to combined GMSK/8PSK modulation.

6 ¸CMU 200 Applications

WCDMA/HSDPA/HSUPA: data applications and video telephony test

The ¸CMU-K96 option makes it possi-ble to test data applications on WCDMA/

HSDPA/HSUPA mobile phones.

In the ACK/NACK menu, the tester displays the data throughput, the CQI median value and the percentages of the ACK, NACK, and DTX val-ues: ACK (DUT has acknowledged), NACK (DUT has not acknowledged and may request a re-peat transmission), DTX = discontinuous trans-missions (DUT was expected to respond but did not).

Settings and measurement results

TheconfigurationoftheRFparametersofaWCDMAradionetworkcanbedy-namicallyadjustedontheR&S®CMU�00duringapplicationtesting.Changingthechannelnumberstriggersanintracellhandover,forexample,whichisrequiredifco-channelinterferenceconsiderablyimpairsthesignalqualityinradionet-works.Sinceareducedtransmitlevelin-creasesthebiterrorprobabilityatthere-ceiverend,anapplicationfunctiononamobilephonecanalsobetestedunderadversereceiveconditions.Iftheappli-cationtestisperformedincompressedmode,themobilephoneissubjectedtoadditionalstress,whichallowsyoutocheckthequalityoftheUEreporttrans-mittedfromthemobilephonetothetes-ter.Whileanapplicationisrunningonthemobilephone,theknowntransmit-

termeasurementssuchaspower,codedomainpower,spectrum,andmodula-tioncanstillbeperformed.Theblockerrorratio(BLER)determinedbytheR&S®CMU�00isusedtoevaluatethereceiverinthemobilephone.

Forsimpletests,the¸CMU�00in-ternallyprovidesservicesforPINGandfiletransferprotocol(FTP)datatransfer.Usingthissimpletestconfiguration,datatransmissionsoffilescanbetestedeveninthemegabitrange.

HSDPA/HSUPA

ThedatatransmissionratesintestsofWCDMAmobilephonesextendintothemegabitrangeinthedownlink(highspeeddownlinkpacketaccess,HSDPA)anduplink(highspeeduplinkpacketaccess,HSUPA).Asalways,allrelevantRFparameterscanbemeasuredandap-plicationscanalsobetestedinthesetwocases.Ofparticularinterestaredatathroughputmeasurements,whichareperformedwithregardtothephysical

layerortheradiolinkcontrol(RLC)pro-tocol.WiththeRLCprotocol,thedatathroughputversustime,aswellassta-tisticsconcerningthetransmittedpro-tocoldataunits(PDU)andservicedataunits(SDU)aredisplayed.Thisprovidestheuserwithaninformativeevaluationofdatatransmissioninthedownlinkanduplinkataglance.

Remote control and automation

Toremote-controltheR&S®CMU�00duringapplicationtests,anIEC/IEEEbusinterfaceisavailable;itcanbeused,forexample,toautomaticallyobtainmea-surementresultsandmeasurementvalues–aprerequisiteforprogram-con-trolledsequences.Suchautomaticallyrunningtestscanberepeatedatanytimeandasoftenasnecessarywith-outstaffintervention,thushelpingtoincreasethesystem’sefficiency.

Protocol analysis

Afterthesoftwarehasbeenportedtothemobilephone,usersoftenwanttorecordprotocolstooptimizeinternalprocessesortoperformanerroranalysisthatmaybenecessary.TheR&S®CMU-Z�6WCDMAmessageanalyzerandrecorderoptionallowsalluniversalterrestrialradioaccessnetwork(UTRAN)protocollayerstoberecorded,whichcanthenbeusedformoredetailedanalysis.Thispowerfultoolpermitsin-depthanalyses,includingtransportlayeranalyses.

¸CMU 200 Applications 7

The ¸CMU-Z46 WCDMA message analyzer and recorder option records all UTRAN protocol layers affected by communications between the ¸CMU200 and the mobile phone. The top half of the screen shows a list of all recorded protocol layers. The individual layers can be selected and their contents analyzed in detail (bottom half of screen).

Video telephony

Inalllikelihood,videotelephonyisthemostspectacularnewWCDMAapplication.Itisuniqueinthatitiscir-cuit-switched,andnotIP-basedlikethepreviouslydescribedapplications.TheWCDMAfirmwarechecksthisfunctionalitywithoutrequiringoptionalextensions.Thetestisperformedinechomode,wherethetransmissionandre-ceptionofvideoandaudiosignalscanbecheckedwithjustonemobilephone.ThevideotelephonysignalstransmittedbythephonetotheR&S®CMU�00areloopedbackbytheradiotesteranddis-playedbythephoneaswould-bevideoandaudiosignalsofacalledstation.

Future prospects

Theapplicationtestissuretogainin-creasingimportanceoverthenextfewyears.Rohde&SchwarzwillcontinuetoenhancethefunctionalscopeoftheR&S®CMU�00’scurrenttestfunctionstomatchmarketrequirements.

Example of Receiver Quality/RLC BLER measurement during an HSDPA/HSUPA data end-to-end connection.

Imagesenttothe¸CMU�00

Imageloopedbacktothemobile

Video telephony test in a loop-back

� ¸CMU 200 Applications

Testing CDMA2000® data applications

With the ¸CMU-B87 option (interface for data testing) and ¸CMU-K87 option (application testing), the ¸CMU200 of-fers comprehensive test capabilities for CDMA2000® 1xRTT and 1xEV-DO packet

data application testing.

Statistical evaluation of data transfer between the ¸CMU 200 and the mobile phone during the application test. After the RLP (radio link protocol type 3) and IP data packets are exchanged, the transmitted and received packets are evaluated using different criteria.

CDMA�000®isaregisteredtrademarkoftheTelecommu-nicationsIndustryAssociation(TIA-USA).

Extensive test capabilities

TheCDMA�000®1xRTTmobileradiostandard,whichwasdevelopedbythe�GPP�standardizationbody,isofficiallyrecognizedbytheITUasanIMT-�000standardforthethirdmobileradiogeneration(�G).Revision0(orA),allowsdataratesofupto�07.�kbit/sina1.��MHzfrequencychannel.The�GPP�1xEV-DOstandard,whichwasdevelopedforpuredataapplications,willbeusedtoanincreasingextentinthefuture.Thelatestversionofthisstandard(1xEV-DORel.A)allowsamaximumdatarateof�.1Mbit/sintheforwardlink(basesta-tiontomobilestation)and1.�Mbit/sinthereverselink(mobilestationtobasestation).

Inthesenetworks,datalinksbasedontheInternetprotocolareplayingamoreandmoresignificantrole.ThiscallsfornewtestproceduresdesignedtoverifythefunctionalityofIP-basedlinks.TheTIA/EIAstandard,forexample,specifiesdifferenttestscenariosforpacket-orient-eddatalinks.

Service Option 33InitsServiceOption��,theTIA/EIAstandardIS-707-A-1specifiesIP-baseddatalinksfortheCDMA�000®standard.TheR&S®CMU�00providesallparam-etersrequiredforthisserviceoption,rangingfromtrafficchannelconfigura-tion(dataratesofupto1��.6kbit/scanbesetforthesupplementalchannel(SCH)bothfortheforwardandthere-verselink)throughtotheparametersformobileIPandauthentication.

PPP authenticationForsettingupapoint-to-pointprotocol(PPP)link,theR&S®CMU�00canbecon-figuredtorequestPPPauthenticationfromthemobilephone.

TheR&S®CMU�00supportstwometh-odsofauthentication:CHAP(challengehandshakeauthenticationprotocol)andPAP(passwordauthenticationprotocol).Onreceivingtheauthenticationrequest,themobilephonereturnstheusernameandthepasswordenteredforthelinksetup.Thetestercheckswhethertheusernameandpasswordarevalid.FortheCHAPprotocol,periodicallyrepeat-ingauthenticationcanbeconfigured.FormobileIPlinks,themobileIPstan-dardstipulatesthatauthenticationbedeactivated.

Mobile IPMobileIPisanadditiontothecon-ventionalInternetprotocol.Itmakesthemovementsofamobilecomputer(mobilenode,i.e.inthiscaseamobilephone)transparentfordataapplicationsandthehigherprotocollayers.

AmobileIPenvironmentinvolvestwonewnetworkelements–thehomeagentandtheforeignagent.Thehomeagentislocatedinthemobilephone‘shomenetwork;itknowsthemobilephone‘scurrentlocationand“­tunnels”datapacketsdirectedtothemo-bilephone‘shomeaddresstothemo-bilephone‘scurrentlocation.Thefor-eignagentassignsthemobilephoneatemporaryaddressintheforeignnet-work(foreignagentcare-ofaddress)andfunctionsastheterminalpointofthetunneldepartingfromthehomeagent.

Cableconnections

Homenetwork

Web server,mail server, etc

R&S®CMU200(base station)

Mobile node(mobile station)

Foreignnetwork

Foreign agent

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of mobile node

Data from/to mobile station

InternetIP tunnel

¸CMU 200 Applications 9

Typical test setup for mobile IP link with mobile station and reference to home agent and foreign agent.

Byusingthe¸CMU�00,internalsin-gle-boxsolutionscanbeimplemented,ascanmobileIPtestscenarios,whichrequireaseparatehomeandforeignagent.

PPP link statusDuringperiodsinwhichthemobilephoneisnottransmittingorreceiv-ingdata,itswitchestoanidlestatereferredtoasdormantmode.Inthismode,thePPPlinkismaintained,butnotrafficchannelconnectionsaresetupintheCDMA�000®network.TheR&S®CMU�00indicatesthevariousPPPstatesthemobilephonecanassume:

Registered mobilephoneisregistered,noPPPlinkisestablished

PPP Connected PPPlinkisestab-lished,trafficchannelconnectionsaresetup,mobilephonetransmits/receivesdata

PPP Dormant PPPlinkisestablished,notrafficchannelconnectionsaresetup,mobilephonedoesnottransmit/receivedata

TX/RX RLP frame and IP packet statisticsAstatisticalevaluationbasedoncountsofthedifferentparametersmakesitpos-sibletotrackthedataflowthroughthebasestation,i.e.theR&S®CMU�00.Thefollowingtypesofdataarecountedsep-aratelyfortheTXandRXdirections:

RLPframesThedifferentRLPframetypes(IDLE,FILL,ACK,etc)TotalPPPbytesTotalPPPpacketsTotalTX/RXdatarate

Application scenarios

TheR&S®CMU�00allowsdifferenttestsetupstobeimplementedfordifferentapplicationscenarios.Inthesimplestcase,youcanoperatethetesterinthestandalonemodetoperformdataratemeasurementsonthemobilephoneundertest.

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10 ¸CMU 200 Applications

Application enabler and validated test cases with the ¸CMU 200 and ¸CRTU

Rohde & Schwarz has expanded its portfolio by test solutions for developing, verifying, and certifying mobile-telephone-specific applications such as MMS (multimedia messaging service), PoC (push-to-talk over

cellular), or DM (device management).

Themodernmobileradiostandardsarethebasisforpowerfulcommunicationsanddatatransmissionnetworksofferingattractiveapplicationssuchasthetrans-missionofpictures,videoclips,ormu-sicfilestooneormoresubscriberssi-multaneously.Forthispurpose,amobilephoneusesthemultimediamessagingservice(MMS),whichtransmitsacombi-nationoftextandmultimediafiles.

PoC,themodernversionofwalkie-talkiecommunication,isaverypromisingnewvoicecommunicationsserviceinmobileradionetworks.Voicemessagesaredi-rectlysenttooneormorepredefinedsubscribersatakeystroke.

Furthermore,mostcommunicationspro-gramsastheyareknowninconnectionwiththeInternetareavailabletomobileusers.OnthebasisoftheInternetpro-tocol(IP),theseprogramscanbetest-edwiththeaidoftheR&SCMU�00ap-plicationtestingsolution.Inthecaseofwebbrowsing,theuserinterfacein-cludesanintegratedhttpserverforsim-plefunctionaltests.

MMS – a new challenge in mobile radio networks

Networkoperatorsmustensuresmoothmultimediafileexchange.However,asaprerequisiteforanefficientnetwork,allmobilephoneshavetomeetspecificmin-imumrequirementsforhandlingthefileformatsused.Forexample,becausedis-playsizesdiffer,allmobilephonesmust

beabletodisplayandreplaythepicturesandvideoclipstransmittedinvarioussiz-esandfileformatsinsuitablequalitywith-outnetworkoperatorshavingtoprovideconversionaidsforthedifferenttypesofmobilephonesinthenetwork.Otherwise,forexample,apicturesentinGIFformattoamobilephonethatcanonlyprocessJPEGformatwouldhavetobeconvertedinthenetwork.Inviewofthemultitudeofdisparatemobilephonesandfilefor-mats,thistaskwouldbevirtuallyimpossi-bletohandle.

TheMMScenteristhecoreofthenewsolutionfromRohde&Schwarz.Itallowsmultimediamessagestobesentandre-ceived.TheMMSCwasspeciallyde-signedforMMStesting.Astheinter-nalMMSCstatescanbeviewed,itof-fersmaximumtransparencyfortrouble-shooting.

AparserandaviewerformthecoreoftheMMSC.Theparsersplitsthemulti-mediamessageintoitsindividualcon-tents;comparingthesecontentswiththereferencecontentsverifiesifamo-bilephoneoperatescorrectly.Thesup-pliedviewercandisplaypicturesorvid-eosandisusefulinfindingoutwhyadisplayisnotcorrect.

PoC – go ahead

PoCisbasedontheIPmultimediasub-system(IMS)standardizedby�GPP.Thisisamultimediaswitchingtechniquede-scribingdifferentIP-basedmultimediaapplications.IMSformsthebasisforthepacket-switchedtransmissionofmulti-mediadata;itmanagesthesetup,con-trol,andreleaseofconnections.Specialrealtimeprotocols(RTP,RTCP,TBCP)ad-ditionallyensureoptimumvoicetrans-missionviathedatanetwork.

Thevoicemessageisconvertedtoada-tastream,packedindatapackets,andsenttothePoCserverofthenetworkoperatorviaradio.ThedatapacketsfindtheirwaythroughthedatanetworkbymeansoftheInternetprotocol(IP).Thevoicecommunicationsserviceisbasedonaclient-serverarchitecture.ThePoCclientonthemobilephoneusestheser-vicesofthePoCserverinthenetwork.ThePoCservertransmitstheincom-ingdatastreamtooneormorereceiv-ersandthedatastreamisreceivedtherewithonlyafewsecondsdelay.Onemes-sagethusreachesmanyreceiversatatime.Tocontrolcorrectcommunications,thePoCserveradditionallytakesoversignalingandensuresthatonlyonesub-scribercantransmitdataandusethevoicechannel.Italsocontrolsthespeci-fiedcommunicationsgroups.

Minimum standard with new test cases

Tocircumventsuchproblems,amin-imumstandardfortransmittingmulti-mediafileshasbeendefined.Onbe-halfoftheGlobalCertificationForum(GCF),theOpenMobileAlliance(OMA)specifiedtestcasesbymeansofwhichitispossibletoverifywhethermobilephonescomplywiththisminimumstan-dardwhenreproducingmultimediacon-tent.Someofthesetestcasesweread-optedbytheGCFandthePCSTypeCertificationReviewBoard(PTCRB)andhavethusbecomepartofthecertifica-tionforallmobilephonessupportingMMS.Unlikesignalingtestcases,thesetestcasesverifyapplicationlayersin-steadoflowerprotocollayers.

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¸CMU 200 Applications 11

MMS test cases

Forreceptiontests,OMAprovidesref-erencesthatalsoincludepicture,video,andsoundfilesindifferentformatsandsizes.Fortestpurposes,amultimediamessageissenttothemobilephone;visualoracousticcomparisondetermineswhetherthedisplayon,orreplayby,themobilephonecomplieswiththerefer-encecontent.Tofacilitatecomparingtheresultsonthemobilephonewiththeref-erencecontent,thereferencecontentisdisplayedonthescreenafterthemes-sagehasbeensent.

Unlikereceptiontests,transmissiontestscanbeevaluatedautomatically.Forthispurpose,themobilephonesendsames-sagewithmultimediacontenttothepro-tocoltester.Usingaparser,theprotocoltestersplitsthecontentintoseparatemediafilesandtheSMILspecification,checkswhethertheycomplywiththereference,andthenindicateswhetherthemobilephonehaspassedthetest.Amanualfilecomparisonusingaviewer,i.e.asuppliedprogramthatcandisplaypicturesandvideosandreplaymusicfiles,isofcoursealsopossible.

PoC test cases

PoClargelyreliesontried-and-testedIP-basedprotocols,suchasthesessioninitiationprotocol(SIP),realtimetrans-portprotocol(RTP),RTPcontrolprotocol(RTCP),andsessiondescriptionprotocol(SDP).TheseprotocolswereexpandedbyPoC-specificparameters.

PoCexpansionsandtheinteractionoftheprotocolsusedcanbecheckedwiththetestcasesclassifiedbytheGlobalCertificationForum(GCF).

DM test cases

Devicemanagement(DM)isastandardapplicationformanagingsoftwareonamobilephone.Viaaweb-basedapplica-tion,youcanchangeorupdatethemo-bilephone'ssoftware,handledebug-gingissues,orinstallapplications"overtheair".Inthatway,thecontentonalostorstolendevicecanalsobeeasilyremoved,andsensitivedocumentsdonotarriveinthehandsofothers.

Validatedtestcaseshelptoensureandtestthestandard-compliantimplemen-tationofthisfeatureonmobilephones.Thetestcasesareimplementedintheopen,standardizedtestlanguageTTCN-�,whichallowstheteststobeeasilysimulatedandalsomodifiedtosuittheuser'srequirements.

Fit for the future with solutions from Rohde & Schwarz

BothserversandthePoCtestcaseshavebeenimplementedassoftwareproductsrunningonPCsbasedonWindows.ThelinkbetweenthemobilephoneandthePCiseitherthe¸CMU�00Universalradiocommunicationtesterorthecorre-spondingdevicesoftheR&S®CRTUpro-tocoltesterfamily.Thesedevicessim-ulateamobileradionetworkandmakeitpossibletocallupanyIP-basedappli-cationsofamobilephonesuchasPoC.Incontrasttopublicmobileradionet-works,youcanindividuallydefinethera-dioparametersduringsuchtestsandre-peatthetestanytimeunderreproduc-ibleconditions.Thesuppliedtestcasesonlyincludetestsattheapplicationlevelandareindependentofthemobileradiostandard.

Future prospects

WiththeR&S®CRTU-ATEapplicationtestenvironmentsoftwareplatform,theRohde&Schwarztestsolutionportfolioindigitalmobileradiorangesfromthephysicallayeruptotheapplicationlay-er.Besidesthedevelopmentandavail-abilityofnewmultimediaapplications,additionaltestsolutionswillfollowonthisbasis.

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ISO 9001DQS REG. NO 1954 QM

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ISO 14001DQS REG. NO 1954 UM

Moreinformationatwww.rohde-schwarz.com(searchterm:CMU�00)

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