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Universal Radio Communication Tester ¸CMU 200Testing Applications in Mobile Radio Communications

September

2005

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� ¸CMU 200 Applications

CMU goes Internet: Testing data applications for WCDMA

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,testscanalsobeperformedonfrequen-cybands,forexample,thatarenotnec-essarilypartofanavailablepublicradionetwork.

Beforecommunicationsservicescanbelaunchedonthemarket,networkop-eratorsmustsubjectthemtointerop-erabilityteststoensurethattheyoper-atesmoothly.Withthemultimediames-sageservice(MMS),forexample,thecorrectexchangeofmessageswiththeserverimplementationinthenetworkorbetweenmobilephonesfromdiffer-entmanufacturersischecked.Moreover,makingobjectivecomparisonsunderus-er-definableandrandomlyreproducibleoperatingandtestconditionsisanotherpivotalfunctionthistargetgroupneeds.

Test setup

Applicationtestsetupsbasicallyconsistofamobilephone,theR&S®CMU�00andaPC.Themobileradiotester,whichisconnectedtothemobilephoneviatheradiointerface,simulatesthemobilera-dionetwork.ViaanEthernetconnection,itaccessestheIP-basedcomputerworld,whichcanbeeitheralocalareanetwork(LAN),theInternetor,atitssimplest,acontroller,wheretheserversprovidingthecommunicationsservicescanbeac-cessed.Theuserusuallyaccessestheseservicesfromthemobilephoneviamo-bileoriginatedcalls.TheR&S®CMU�00bridgesthegapbetweenwireddatacommunicationsandradiocommunica-tionsacrossvariousprotocollayers.

Versatile test scenarios

Go/NoGotestsstartanapplicationonthemobilephoneandtesttheoperationfromtheuser‘sviewpoint.ThesetestsdifferfromRFmeasurementsperformedwiththeR&S®CMU�00bycoveringtheentireoperatingsystemofaphoneandsubjectingittotheappropriatestress.

Afteranapplicationpass-esthisbasictest,perfor-mancemeasurementsareusuallycarriedout;theiraimistoanalyzetheachievabledatatransmis-sionratesinthedownlinkandtheuplink.

Anothernoteworthycri-terionthathelpsdeter-minethepracticalvalueofmobilephonesistheiroperatingtimewithre-chargeablebatteries.Tominimizeaphone’spow-erconsumption,youneedtomeasuretheconsump-

The highly successful Universal Radio Communication Tester R&S®CMU200, which was originally designed as a pure RF tester for the various mobile radio stan-dards used around the world, now enables additional user groups to test video tele-

phony and data applications.

¸CMU 200 Applications �

tionwhileanapplicationisactivesothatyoucanfindoutmoreaboutpossi-bleoptimizationprocedures.Ifrequired,themobileradiotestersimultaneous-lyrecordsdetailedinformationabouttheprocessedprotocollayersinalogfile,whichisthenavailableforfutureevalua-tionandanalysis.

Interactiontestsanalyzehowdifferent,simultaneouslyactiveapplicationsonamobilephoneaffecteachother.Thesetestsanalyze,forexample,whatwillhappenifanSMSarriveswhileavideoisbeingdownloadedandthecalendarfunctionisoutputtinganalarm.

Interoperabilitytestscheckwhethermo-bilephonesfunctionsmoothlywithinanetwork,forexamplewheninteractingwiththenetworkoperator’sMMSserv-er,orwhentwophonesfromdifferentmanufacturersinteractwitheachother.Inthesimplestcase,justonephoneisusedintheloop-backmodetoperformacombinedtransmission/receptiontest.

Forthistest,anMMSisgeneratedonthemobilephoneandthensentbacktothesamephoneiftheoriginatingphonenumberisenteredattransmittal.Beforeanewmobilephonereachesthemarket,itmustundergoanumberofteststoen-

surethatiscustomer-ready.IntheEMCtest,forexample,thetelephonemustoperatereliablyinthelabduringsimul-taneoustransmissionandreceptionofdataandremainlargelyunaffectedbystrongelectromagneticfields.

Whenthe¸CMU�00iscombinedwiththeFadingSimulator¸ABFS,theoperationofamobiletelephoneun-dervariousfadingscenariossuchasinanautomobileatvariousspeedsandre-ceptionconditionscanbesimulated.Thus,thereliabilityofdataexchangecanbetestedandevaluated.

TCP/IP services

Theclientsonthemobilephonere-quiresuitableserversatthecontrol-lerendasacounterpartforapplicationtests.TheR&S®CMU-K96WCDMAap-plicationtestingoptionallowsIP-baseddataapplicationstobetestedonamo-bilephone;inaddition,itincludessever-alTCP/IPservers,forexampleanHTTPserver,whichallowsyoutostartawebbrowseronamobilephone.AnotherserveristheMMScenter(MMSC)withbasicfunctionality,whichcanbeusedtotestthetransmissionandreceptionofmultimediamessagesonamobilephone.

Future prospects

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

� ¸CMU 200 Applications

(E)GPRS application tests with the ¸ CMU200

Owingtosignificantprotocolstackex-tensions,the¸CMU�00nowalsoallowsyoutotestapplicationsviaGPRSandEGPRS(EDGE)mobilephonessimplybyactivatinganewsoftwareop-tion.InadditiontotheapplicationtestforCDMA�000®,thisisyetanotherstandardideallysupportedbythe¸CMU�00,provingitsflexible,fu-ture-proofconcept.ThenewsoftwareoptionmakesitpossibletotestalmostanyIP-basedapplicationsinpacket-ori-entedmodeviaanIPgateway.

Versatile application tests in (E)GPRS mobile radio

The software option ¸CMU-K92 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.

Youcansimplytestproperfunction-ing,butalsocheckwhetherdifferentap-plicationsthataresimultaneouslyacti-vatedonamobilephonerunsmoothly.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,spectrumormod-ulation.Unliketheprevioustransmittertest,themeasurementisnowperformedaspartoftheapplicationdatatransmis-sionandnolongeronthebasisofpseu-

do-randombinarysequences(PRBS).IftwoR&S®CMU�00testersareavailable,theapplicationtestscanbeexpandedtoaccommodatedataend-to-endtests,forexampleforcheckingtheexchangeofanMMSmessagebetweentwomo-bilephones.IfonlyoneR&S®CMU�00isavailable,thetransmissionandslightlydelayedreceptionofanMMSmessagewithonemobilephonecanalsobeim-plementedusingtheloop-backsettingintheMMSC.

Powerful aid in the development lab

ThenewsoftwareoptionR&S®CMU-K9�fortheR&S®CMU�00forthefirsttimeal-lowsapplicationdesignengineerstotesttheirworkinthelabonmobilephonesinasimulatedradionetwork.Inthiscase,themainfocusisonprovingthattheap-plicationrunssmoothlyonthemobilephoneundernormaloperatingandradioconditions.Fortheseapplications,whichcanbedividedintomobile-originatedandmobile-terminatedapplications,thisrep-resentsthefirstrealistictestaftercom-pletionofthesimulationtestsonthede-velopmentcomputer.Whentestingmo-bile-originatedapplications,datacommu-nicationisinitiatedonthemobilephone,

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

Throughput of the IP data packets exchanged between mobile phone and server in Uplink (UL) and Downlink (DL)

¸CMU 200 Applications �

forexamplebycallingupanintegratedbrowserwithsubsequentaccesstothedataofawebserverconnectedviatheEthernetinterfaceoftheR&S®CMU�00.Anexampleofatestofamobile-termi-natedapplicationisanSMStransmission,eitherfromacomputerconnectedtothetesterordirectlyfromthetestertothemobilephone.

Future prospects

Option¸CMU-K9�istheplatformforfurtherapplicationtests.ThisoptionisrequiredinordertorunthevalidatedMMStestcasesortotestcomplexap-plicationssuchaspushtotalkovercel-lular(PoC).Intheforthcomingconfigura-tions,dataapplicationscanalsobetest-edwhilevoicetransmissionisinprog-ress.Iffeasiblewiththemobilephone,bothapplications(circuit-switched/pack-et-switched)canthenbeoperatedandtestedsimultaneouslyinthedualtrans-fermode.

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

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

6 ¸CMU 200 Applications

Settings and measurement results

ToconfiguretheWCDMAradionetworkforapplicationtests,theR&S®CMU�00parametersettingsknownfromtheRFmeasurementscanbeusedanddynam-icallyadjustedduringtesting.Changingthechannelnumberstriggersanintra-cellhandover,forexample.Sinceare-ducedtransmitlevelincreasesthebiter-rorprobabilityatthereceiverend,anapplicationfunctiononamobilephonecanalsobetestedunderadversereceiveconditions.Iftheapplicationtestisper-formedincompressedmode,themobilephoneissubjectedtoadditionalstress,whichallowsyoutocheckthequalityoftheUEreporttransmittedfromthemo-bilephonetothetester.Whileanappli-cationisrunningonthemobilephone,theknowntransmittermeasurements

suchaspower,codedomainpowerandmodulationcanstillbeperformed.Theblockerrorratio(BLER)determinedbytheR&S®CMU�00isusedtoevaluatethereceiverinthemobilephone.

Incombinationwithanadditionalfad-ingsimulatorsuchastheR&S®ABFS,thefunctionofanapplicationcanbesimu-latedatdifferentspeedsinvehiclesandinvaryingenvironments.

Remote control and automation

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

Protocol analysis

Afterthesoftwarehasbeenport-edtothemobilephone,usersoftenwanttorecordprotocolstooptimizein-ternalprocessesortoperformaner-roranalysisthatmaybenecessary.TheR&S®CMU-Z�6WCDMAmessageana-lyzerandrecorderoptionallowsalluni-versalterrestrialradioaccessnetwork(UTRAN)protocollayerstoberecord-ed,whichcanthenbeusedformorede-tailedanalysis(FIG�).Thispowerfultoolpermitsin-depthanalyses,includingtransportlayeranalyses.

WCDMA: data applications and video telephony test

Option ¸CMU-K96 makes it possible to test data applications on WCDMA mobile

phones

An inner loop power measurement can be used during the application test, for example, to test the accu-racy of a mobile phone‘s amplifi-er when traffic power commands (TPC) are being carried out.

¸CMU 200 Applications 7

Video telephony

Inalllikelihood,videotelephonyisthemostspectacularnewWCDMAappli-cation.Itisuniqueinthatitiscircuit-switched,andnotIP-basedlikethepre-viouslydescribedapplications.TheWCDMAfirmwarechecksthisfunc-tionalitywithoutrequiringoptionalex-tensions.Thetestisperformedinechomode,wherethetransmissionandre-ceptionofvideoandaudiosignalscanbecheckedwithjustonemobilephone.ThevideotelephonysignalstransmittedbythephonetotheR&S®CMU�00areloopedbackfromtheradiotesteranddisplayedbythephoneaswould-bevid-eoandaudiosignalsofacalledstation.

Future prospects

Theapplicationtestisthelatestadd-ontoradiocommunicationstestingandsuretogainincreasingimportanceoverthenextfewyears.Rohde&Schwarzwillcontinuetoenhancethefunction-alscopeoftheR&S®CMU�00’scur-renttestfunctionstomatchmarketre-quirements.Thenextstepstobetak-enincludetheexpansiontohighspeeddownlinkpacketaccess(HSDPA)and,onceauniformworldwidestandardhasbeenspecified,totestcasesforpushtotalkovercellular(PoC).

The ¸CMU-Z46 WCDMA message analyzer and recorder option records all UTRAN protocol layers affected by communications between the ¸CMU 200 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).

� ¸CMU 200 Applications

Extensive test capabilities

TheCDMA�000®1xmobileradiostan-dard,whichwasdevelopedbythe�GPP�standardizationbody,isofficiallyrecog-nizedbytheITUasanIMT-�000stan-dardforthethirdmobileradiogeneration(�G).Revision0(orA),whichisnowincommercialuse,allowsdataratesofupto�07.�kbit/sina1.��MHzfrequencychannel.Oncefurtheroptimizationstag-eshavebeencompleted,RevisionA(al-soknownas1xEV-DO)willallowamax-imumdatarateof�.1Mbit/sinthefor-wardlink(basestationtomobilestation)and1.�Mbit/sinthereverselink(mobilestationtobasestation).

In�Gnetworks,datalinksbasedontheInternetprotocolareplayingamoreandmoresignificantrole.ThiscallsfornewtestproceduresdesignedtoverifythefunctionalityofIP-basedlinks.Forexam-ple,theTIA/EIAstandardTIA-�9�spec-ifiesdataratemeasurementsforFTPlinks.

Service Option 33InitsServiceOption��,theTIA/EIAstandardIS-707-A-1specifiesIP-baseddatalinksfortheCDMA�000®stan-dard.TheR&S®CMU�00providesallpa-rametersrequiredforthisserviceop-tion,rangingfromtrafficchannelconfig-uration(dataratesofupto1��.6kbit/scanbesetforthesupplementalchannel(SCH)bothfortheforwardandthere-verselink)throughtotheparametersformobileIPandauthentication.

PPP authenticationForsettingupapoint-to-pointproto-col(PPP)link,theR&S®CMU�00canbeconfiguredtorequestPPPauthen-ticationfromthemobilephone.TheR&S®CMU�00supportstwomethodsof

authentication:CHAP(challengehand-shakeauthenticationprotocol)andPAP(passwordauthenticationprotocol).Onreceivingtheauthenticationrequest,themobilephonereturnstheusernameandthepasswordenteredforthelinksetup.Thetestercheckswhethertheus-ernameandpasswordarevalid.FortheCHAPprotocol,periodicallyrepeatingauthenticationcanbeconfigured.FormobileIPlinks,themobileIPstandardstipulatesthatauthenticationbedeac-tivated.

Mobile IPMobileIPisanadditiontotheconven-tionalInternetprotocol.Itmakesthemovementsofamobilecomputer(mo-bilenode,i.e.inthiscaseamobilephone)transparentfordataapplicationsandthehigherprotocollayers.

AmobileIPenvironmentinvolvestwonewnetworkelements–thehomeagentandtheforeignagent.Thehomeagentislocatedinthemobilephone‘shomenetwork;itknowsthemobilephone‘scurrentlocationand“­tunnels”datapacketsdirectedtothemobilephone‘shomeaddresstothemobilephone‘scurrentlocation.Theforeignagentassignsthemobilephoneatem-poraryaddress(foreignagentcare-ofad-dress)intheforeignnetworkandfunc-tionsastheterminalpointofthetunneldepartingfromthehomeagent.

TheIPaddressesforthemobilephone‘sforeignagentandhomeagentcanbedefinedontheR&S®CMU�00,thusal-lowingdatapacketstobeexchangedbetweentheforeignagentandthemo-bilephone.

Testing CDMA2000® data applications

Standard CDMA2000® mobile radio net-works have already been in commercial use since 2000 in many Asian countries (e.g. Japan and South Korea), the Americas (e.g. the USA and Canada), as well as in Eastern Europe. With the options ¸CMU-B87 and ¸CMU-K87 the R&S ® CMU200 now offers extensive test capabilities for data applications for this important global

3G standard.

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).

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¸CMU 200 Applications 9

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/re-ceivedata

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

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

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Application scenarios

TheR&S®CMU�00allowsdifferenttestsetupstobeimplementedfordifferentapplicationscenarios.Inthesimplestcase,youcanoperatethetesterinthestandalonemodetoperformdataratemeasurementsonthemobilephoneun-dertest.

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

10 ¸CMU 200 Applications

MMS – a new challenge in mobile radio networks

GPRS,EGPRSandUMTSarepowerfulcommunicationsanddatatransmissionnetworksofferingattractiveapplicationssuchasthetransmissionofpictures,vid-eoclipsormusicfilestooneormoresubscriberssimultaneously.Forthispur-pose,amobilephoneusesthemulti-mediamessageservice(MMS),whichtransmitsacombinationoftextandmultimediafiles.

Networkoperatorsmustensuresmoothmultimediafileexchange.However,asaprerequisiteforanefficientnetwork,allmobilephoneshavetomeetspecif-icminimumrequirementsforhandlingthefileformatsused.Forexample,be-causedisplaysizesdiffer,allmobilephonesmustbeabletodisplayandre-playthepicturesandvideoclipstrans-mittedinvarioussizesandfileformatsinsuitablequalitywithouthavingtoreverttoconversionaidsforthedifferenttypesofmobilephonesthatnetworkopera-torsprovideinthenetwork.Otherwise,forexample,apicturesentinGIFformattoamobilephonethatcanonlyprocessJPEGformatwouldhavetobeconvertedinthenetwork.Inviewofthemultitudeofdisparatemobilephonesandfilefor-mats,thistaskwouldbevirtuallyimpos-sibletohandle.

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.

Forreceptiontests,OMAprovidesref-erencesthatalsoincludepicture,videoandsoundfilesindifferentformatsandsizes.Fortestpurposes,amultimediamessageissenttothemobilephone;vi-sualoracousticcomparisondetermineswhetherthedisplayon,orreplayby,themobilephonecomplieswiththerefer-encecontent.Tofacilitatecomparingtheresultsonthemobilephonewiththeref-erencecontent,thereferencecontentisdisplayedontheR&S®CRTUscreenafterthemessagehasbeensent.

Unlikereceptiontests,transmissiontestscanbeevaluatedautomatically.Forthispurpose,themobilephonesendsames-sagewithmultimediacontenttothepro-tocoltester.Usingaparser,theproto-coltestersplitsthecontentintoseparatemediafilesandtheSMILspecification,checkswhethertheycomplywiththereferenceandthenindicateswhetherthemobilephonehaspassedthetest.Amanualfilecomparisonusingaviewer,i.e.asuppliedprogramthatcandisplaypicturesandvideosandreplaymusicfiles,isofcoursealsopossible.

Fit for the future with solutions from Rohde & Schwarz

TheR&S®CRTU-ATEapplicationtestenvironmentsoftwareplatformfromRohde&SchwarzisaflexibleMMStestsolution.The¸CRTU-ATEsoftwareplatformcontainsallcomponentsre-quiredforMMStests.Itismodularindesignsothatitcanbeexpandedtomeetfuturerequirements.Thesuppliedtestcasesonlyincludetestsattheappli-cationlevelandareindependentofthemobileradiostandard.

MMS tests on (E)GPRS and WCDMA multimedia mobile phones with the ¸CMU 200 and ¸CRTU

With the R&S ® CRTU-ATE application test environment software platform Rohde & Schwarz has expanded its portfo-lio by an MMS test solution for developing, verifying and certifying multimedia mobile

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¸CMU 200 Applications 11

ThecoreoftheMMScenterconsistsofaparserandaviewer.Theparsersplitsthemultimediamessageintoseparatecontents;comparingthemwiththeref-erencecontentindicateswhetheramo-bilephonefunctionscorrectly.Thesup-pliedviewercandisplaypicturesorvid-eosandhelpfindoutwhyadisplayisnotcorrect.

Summary

WithitsR&S®CRTU-ATEMMStestsolu-tion,Rohde&Schwarzhasexpandeditsportfoliobyakeycomponentfordevel-oping,verifyingandcertifyingmultime-diamobilephones.ThenextstepwillbetoprovidetestsolutionsforPoCandtheInstantMessagingandPresenceService(IMPS).

Certified Quality System

ISO 9001DQS REG. NO 1954 QM

Certified Environmental System

ISO 14001DQS REG. NO 1954 UM

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

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