4/20/2015 SoftwareTesting:BluetoothInterviewquestionsandanswers

http://softwaretestersadda.blogspot.in/2012/12/bluetoothinterviewquestionsand.html 1/6

SoftwareTesting

Monday,December24,2012

BluetoothInterviewquestionsandanswers

BluetoothProfiles:https://www.bluetooth.org/Building/HowTechnologyWorks/ProfilesAndProtocols/Overview.htm

WhyisBluetoothcalledacablereplacementtechnology?BluetoothtechnologyallowsthecreationofPersonalAreaNetworkswithoutcablesorwiresthatareusualinhomenetworks.

GiveagenericdescriptionofBluetooth?Bluetoothisalowcost,shortrange(RF)linksbetweenmobilePCs,mobilephonesandotherportabledevices.Bluetoothcantransmitthroughsolid,nonmetalobjects.

WhycanBluetoothequipmentintegrateeasilyinTCP/IPnetwork?BecauseBluetoothuseswirelessLANstandardsIEEEfordatatransmission.

IsitpossibletoconnectmultipleBluetoothhubs?No,onlyonehubcanbeusedatatimewithacomputer.USBorSerialdevicescanbeadded.

WhatisFCCandhowdoesitrelatetoBluetooth?FCCisFederalCommunicationCommission,whichissueslicensestothestationsforspecificfrequencies.Italsodecideswhoisabletousewhichfrequencyforwhatpurpose.SinceBluetoothisusingunlicensedspectrum,FCChasnodirectinvolvementwithBluetooth

UnderwhatfrequencyrangedoesBluetoothwork?2.45GHzisthefrequencyrange.

DoBluetoothdevicesneedlineofsighttoconnecttooneanother?No.

WhichtechnologyisusedinBluetoothforavoidinginterference?FrequencyhoppingisthetechnologyusedinBluetooth.

BluetoothsignalsdonotinterferewithourPCsorcordlessphonesorportables.Why?Bluetoothuseslowpowersignals,itplaysaroundin2.45GHzrange,whilemostofconsumerdeviceswouldbeusing900MHz.

WhatisAirport?Airportisawirelesscommunicationssystem,likeBluetooth.ItisbasedontheIEEE802.11recommendation.Italsouses2.4GHzfrequencyband,butitsrangeisabout45metersanditboastsatransmissionspeedof11Mbit/second.ItisdevelopedbyLucentTechnologies.

WhatisPiconet?AcollectionofdevicesconnectedthroughBluetoothtechnologyinanadhocfashion.

WhatarethethreemaintypesofconnectionusedbyBluetooth?Singleslave,Masterslave,Scatternet.

WhatisFECinBluetooth?ForwardErrorCorrectionisamethodbywhichBluetoothincreasesitsnoiseimmunity.FECisamethodthatenablesareceivertonotonlydetect,butalsocorrecterrorsinatransmission.

WhichmethodisprimarilyusedforVoicetransfer?SynchronousConnectionOriented(SCO)isamethodprimarilyusedforVoicetransfer.

WhatisthefrequencyrangeusedforBluetoothinEuropeandUnitedStates?2402MHzto2480MHzarethefrequencyrangesusedinUSAandEurope.

ListsomeTechnologycharacteristicofBluetooth?Omnidirectional,Adaptiveoutputpowertominimizeinterference,SupportSynchronous&asynchronousservices,FastFrequencyHoppingtoavoidinterference,Shortdatapacketstomaximizecapacityduringinterface.

WhichcompanyoriginallyconceivedanddevelopedBluetooth?Ericsson.

HowdoesBluetoothusefrequencyhoppingforsecurity?Bluetoothpicksarandomfrequencyoutof79andthenhopsaroundtherangeabout1600timespersecond.

WhatisaBluetoothdongle?Adevicethathangsoutsideofacomputer,orphonetoprovideBluetoothconnection.

Whataretheother(competingornot)wirelesstechnologies?WiFi,IrDa,EDGE,UWB

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4/20/2015 SoftwareTesting:BluetoothInterviewquestionsandanswers

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(UltraWideBand)

WhichBluetoothversionusesadaptivefrequencyhopping?Why?InVersion1.2Adaptivefrequencyhoppingmethodisused,whichimprovesresistancetoradiointerference,andprovideshighertransmissionspeed.

HowmanySCOlinksarethereinapiconet?Inapiconet,therecanbeuptothreeSCOlinksof64,000bitspersecondeach.

whatisthetotalnumberofmastersandslavesinapiconet?1Masterand7Slaves.

WhichmethodisusedforDatatransfer?AsynchronousConnectionless(ACL)isDatatransfermethodinBluetooth

WhatisthefrequencyrangeusedforBluetoothinJapan?2472to2497MHzisthefrequencyrangeusedforBluetoothinJapan.

Whatisthestrengthofthesignaltransmittedbypowerfulcellphones?Thepowerfulcellphonescantransmitasignalof3watts.

WhyisBluetooth2.0better?ThemainfeaturesofBluetoothCoreSpecificationVersion2.0+EDRare:3timesfastertransmissionspeed(upto10timesincertaincases)LowerpowerconsumptionthroughreduceddutycycleSimplificationofmultilinkscenariosduetomoreavailablebandwidthBackwardscompatibletoearlierversionsFurtherimprovedBER(BitErrorRate)performance

NamefewapplicationsofBluetooth?

1. Wirelesscontrolofandcommunicationbetweenacellphoneandahandsfreeheadsetorcarkit.Thisisthemostpopularuse.

2. WirelessnetworkingbetweenPCsinaconfinedspaceandwherelittlebandwidthisrequired.

3. WirelesscommunicationswithPCinputdevicessuchasmousesandkeyboardsandoutputdevicessuchasprinters.

4. TransferoffilesbetweendevicesviaOBEX.5. Transferofcontactdetails,calendarappointments,andremindersbetweendevicesvia

OBEX.6. Replacementoftraditionalwiredserialcommunicationsintestequipment,GPSreceivers

andmedicalequipment.7. Forremotecontrolswhereinfraredwastraditionallyused.8. SendingsmalladvertisementsfromBluetoothenabledadvertisinghoardingstoother,

discoverable,Bluetoothdevices.9. Wirelesscontrolofagamesconsole,NintendosWiiandSonysPlayStation3willboth

useBluetoothtechnologyfortheirwirelesscontrollers.10. SendingcommandsandsoftwaretotheupcomingLEGOMindstormsNXTinsteadofinfra

red.

Howmanydevicescancommunicateconcurrently?ABluetoothdeviceplayingtheroleofthemastercancommunicatewithupto7devicesplayingtheroleoftheslave.Thisnetworkofgroupofupto8devices(1master+7slaves)iscalledapiconet.ApiconetisanadhoccomputernetworkofdevicesusingBluetoothtechnologyprotocolstoallowonemasterdevicetointerconnectwithuptosevenactiveslavedevices(becauseathreebitMACaddressisused).Upto255furtherslavedevicescanbeinactive,orparked,whichthemasterdevicecanbringintoactivestatusatanytime.

WhatisPairing?Pairsofdevicesmayestablishatrustedrelationshipbylearning(byuserinput)asharedsecretknownasapasskey.Adevicethatwantstocommunicateonlywithatrusteddevicecancryptographicallyauthenticatetheidentityoftheotherdevice.Trusteddevicesmayalsoencryptthedatathattheyexchangeovertheairsothatnoonecanlistenin.TheencryptioncanhoweverbeturnedoffandpasskeysarestoredonthedevicesfilesystemandnottheBluetoothchipitself.SincetheBluetoothaddressispermanentapairingwillbepreservedeveniftheBluetoothnameischanged.Pairscanbedeletedatanytimebyeitherdevice.Deviceswillgenerallyrequirepairingorwillprompttheownerbeforeitallowsaremotedevicetouseanyormostofitsservices.SomedevicessuchasSonyEricssonphoneswillusuallyacceptOBEXbusinesscardsandnoteswithoutanypairingorprompts.CertainprintersandaccesspointswillallowanydevicetouseitsservicesbydefaultmuchlikeunsecuredWiFinetworks.

HowsecureaBluetoothdeviceis?BluetoothusestheSAFER+algorithmforauthenticationandkeygeneration.TheE0streamcipherisusedforencryptingpackets.ThismakeseavesdroppingonBluetoothenableddevicesmoredifficult.

WhatisBluetoothSIG?BluetoothSpecialInterestGroup(SIG)

Bluetoothwirelesstechnologyisrevolutionizingpersonalconnectivitybyprovidingfreedomfromwiredconnections.Itisaspecificationforasmallformfactor,lowcostradiosolutionproviding

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4/20/2015 SoftwareTesting:BluetoothInterviewquestionsandanswers

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linksbetweenmobilecomputers,mobilephones,otherportablehandhelddevicesandautomobiles,aswellasconnectivitytotheInternet.TheBluetoothSIG,comprisedofleadersinthetelecommunications,computing,automotiveandconsumerelectronicsindustries,isdrivingdevelopmentofthetechnologyandbringingittomarket.TheBluetoothSIGincludesPromotermembercompaniesAgere,Ericsson,IBM,Intel,Microsoft,Motorola,NokiaandToshiba,andthousandsofAssociateandAdoptermembercompanies.TheBluetoothSIG,Inc.headquartersarelocatedinOverlandPark,Kansas,U.S.A.

Whataretheproblemswitholderversions(1.0and1.0B)?Versions1.0and1.0Bhadnumerousproblemsandthevariousmanufacturershadgreatdifficultiesinmakingtheirproductsinteroperable.1.0and1.0BalsohadmandatoryBluetoothHardwareDeviceAddress(BD_ADDR)transmissioninthehandshakingprocess,renderinganonymityimpossibleataprotocollevel,whichwasamajorsetbackforservicesplannedtobeusedinBluetoothenvironments,suchasConsumerism.

WhatareDifferentClassesinBluetooth?Bluetoothisaradiostandardandcommunicationsprotocolprimarilydesignedforlowpowerconsumption,withashortrange(powerclassdependent:1meter,10meters,100meters)basedaroundlowcosttransceivermicrochipineachdevice.

Bluetoothletsthesedevicescommunicatewitheachotherwhentheyareinrange.Thedevicesusearadiocommunicationssystem,sotheydonothavetobeinlineofsightofeachother,andcanevenbeinotherrooms,solongasthereceivedpowerishighenough.

WhatareBluetoothprofiles?Aprofileisadescriptionofhowtouseaspecificationtoimplementaparticularfunction.TheInternationalStandardsOrganization(ISO)firstcameupwiththeideaofprofiles.InBluetooth,thereareseveralprofilesavailableandtheyarearrangedinahierarchicalfashion.Forexample,inordertousetheheadsetprofile,adevicemustalsoincludethelowerlevelprofilessuchastheserialportandgeneralaccessprofiles.

WhataresomeoftheusesofBluetooth?DependingontheBluetoothprofilesincludedonthedevice,Bluetoothtechnologyhasthecapabilitytowirelesslysynchronizeandtransferdataamongdevices.TheBluetoothaudiocapabilitiescanbeusedforheadsetandhandsfreeapplications.TheexactfunctionalityprovidedbyaBluetoothenableddevicedependsontheBluetoothprofilesincluded.

HowdoesBluetoothfitinwithWiFi?The802.11b(WiFi)standardiscommonlyusedforwirelessnetworking.Bluetoothisnotacompetitorwith802.11b,butratheracomplementtoit.While802.11bisgenerallyareplacementforwiredlocalareanetworking,Bluetoothismorecommonlyusedasareplacementforcablesbetweenindividualdevices.Bluetoothisdesignedtolinkdeviceswithinaveryshortrange(upto33feet).Bluetoothispartofthe802.15standard.

WhatisthehistoryofBluetooth?BluetoothwasinitiatedbyEricsson,IBM,Intel,NokiaandToshibainearly1998.ThesecompanieslaterformedaspecialinterestgroupknownastheBluetoothSIG.TheBluetooth1.0specificationswerereleasedonJuly26,1999,butthetechnologyhasonlyrecentlybecomeinexpensiveenoughforwidespreaduse.

Whatisitatechnology,astandard,aninitiative,oraproduct?Bluetoothwirelesstechnologyisadefactostandard,aswellasaspecificationforsmallformfactor,lowcost,shortrangeradiolinksbetweenmobilePCs,mobilephonesandotherportabledevices.TheBluetoothSpecialInterestGroupisanindustrygroupconsistingofleadersinthetelecommunications,computing,andnetworkingindustriesthataredrivingdevelopmentofthetechnologyandbringingittomarket

IsBluetoothanIEEEstandard,likeIEEE802.11andEthernet?BeinganIEEEstandardwillbeabigplustowidespreadadoptionofBluetooth,andIEEE802.15workinggroupforpersonalareanetworks(PAN)announcedthattheywillbeadoptingBluetoothastheIEEE802.15standard.

WhattypesofcompaniesarelikelytoadoptorpromoteBluetoothtechnology?Companieslikelytoadoptthistechnologyinclude,butarenotlimitedto,softwaredevelopers,networkvendors,siliconvendors,peripheralandcameramanufacturers,mobilePCandhandhelddevicemanufacturers,consumerelectronicsmanufacturersandmore.

WhatcompaniesareinvolvedintheBluetoothinitiative?GlobaltechnologyleadersEricsson,Nokia,IBM,IntelandToshibafoundedtheBluetoothSIGin1998.Thesecompaniesarenowsupportedbyover1,000otherorganizationswithawiderangeofexpertise,includingWidcomm,Inc.

AredifferentbrandsofBluetoothproductscompatible?Yes.Theyhaveto.TheBluetoothLogoCertificationProgramrequiresBluetoothproductstointeroperatewithproductsmanufacturedbyothervendorsthoseproductsthatdontinteroperatewillnotbeallowedtousetheBluetoothlogo.

IsBluetoothpracticalforusewithmobiledevices?Yes.Oneconcernformobilecomputingusersispowerconsumption.Bluetoothradiosareverylowpower,drawingaslittleas0.3mAinstandbymodeand30mAduringsustaineddatatransmissions.Bluetoothradiosalternateamongpowersavingmodesinwhichdeviceactivityisloweredtomaximizethemobilepowersupply.

WhatkindofencryptionwillbeusedforBluetoothsecurity?

4/20/2015 SoftwareTesting:BluetoothInterviewquestionsandanswers

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TheBluetoothspecification1.0describesthelinkencryptionalgorithmasastreamcipherusing4LFSR(linearfeedbackshiftregisters).ThesumofthewidthoftheLFSRsis128,andthespecsaystheeffectivekeylengthisselectablebetween8and128bits.ThisarrangementallowsBluetoothtobeusedincountrieswithregulationslimitingencryptionstrength,andfacilitateafutureupgradepathforthesecuritywithouttheneedforacostlyredesignofthealgorithmsandencryptionhardwareaccordingtotheBluetoothspecification.Keygenerationandauthenticationseemstobeusingthe8roundSAFER+encryptionalgorithm.TheinformationavailablesuggeststhatBluetoothsecuritywillbeadequateformostpurposesbutuserswithhighersecurityrequirementswillneedtoemploystrongeralgorithmstoensurethesecurityoftheirdata.

WhatistherangeofBluetoothtransmitter/receivers?Bluetoothisdesignedforverylowpoweruse,andthetransmissionrangewillonlybe10m,about30ft.HighpoweredBluetoothdeviceswillenablerangesupto100m(300ft).ConsideringthedesignphilosophybehindBluetooth,eventhe10mrangeisadequateforthepurposesBluetoothisintendedfor.LaterversionsoftheBluetoothspecmayallowlongerranges.

WhatisthedatathroughputspeedofaBluetoothconnection?Bluetoothtransfersdataatarateof721Kbps,whichisfromthreetoeighttimestheaveragespeedofparallelandserialports,respectively.Thisbandwidthiscapableoftransmittingvoice,data,videoandstillimages

WillBluetoothandWirelessLAN(WLAN)interferewitheachother?No,bothBluetoothandWLANcancoexist.SinceBluetoothdevicesuseFrequencyHoppingandmostWLANsuseDirectSequenceSpreadingtechniquestheyeachappearasbackgroundnoisetotheotherandshouldnotcauseanyperceivableperformanceissues.

WillotherRF(RadioFrequency)devicesinterferewithBluetoothDevices?No.Bluetoothradiosoperateontheunlicensed2.4GHz(Industrial,ScientificandMedical)frequencybandthatissharedamongotherdevices(microwaveovens,cordlessphones,garagedooropeners,etc.).Bluetoothradiosswitchfrequenciesatsucharapidpace(1,600timespersecond)andthedatapacketsaresosmallthatinterferencefromotherRFsourcesishighlyunlikely.Bluetoothisarobustcommunicationsystem.

WhatisFrequencyHoppingSpreadSpectrum(FHSS)?FrequencyHoppingSpreadSpectrum(FHSS)isaspreadspectrummodulationschemethatusesanarrowbandcarrierthatchangesfrequencyinapatternknowntobothtransmitterandreceiver.Properlysynchronized,theymaintainasinglelogicalchannel.Toanunintendedreceiver,FHSSappearsasshortdurationimpulsenoise.Moresimply,thedataisbrokendownintopacketsandtransmittedtothereceiverofotherdevicesovernumeroushopfrequencies(79total)inapseudorandompattern.Onlytransmittersandreceiversthataresynchronizedonthesamehopfrequencypatternwillhaveaccesstothetransmitteddata.Thetransmitterswitcheshopfrequencies1,600timespersecondtoassureahighdegreeofdatasecurity

HowsecureisaBluetoothnetwork?Bluetoothisextremelysecureinthatitemploysseverallayersofdataencryptionanduserauthenticationmeasures.BluetoothdevicesuseacombinationofthePersonalIdentificationNumber(PIN)andaBluetoothaddresstoidentifyotherBluetoothdevices.Dataencryption(i.e.,128bit)canbeusedtofurtherenhancethedegreeofBluetoothsecurity.Thetransmissionscheme(FHSS)providesanotherlevelofsecurityinitself.Insteadoftransmittingoveronefrequencywithinthe2.4GHzband,Bluetoothradiosuseafastfrequencyhoppingspreadspectrum(FHSS)technique,allowingonlysynchronizedreceiverstoaccessthetransmitteddata

WhatisthefuturedirectionoftheBluetoothstandard?Atthistime,weanticipatetheBluetoothSIGtoevolvetheBluetoothtechnologytoprovidegreaterbandwidthanddistances,thusincreasingthepotentialplatformsandapplicationsusedintheemergingpersonalareanetworkingmarketplace.

HowisBluetoothused?Bluetoothcanbeusedtowirelesslysynchronizeandtransferdataamongdevices.Bluetoothcanbethoughtofasacablereplacementtechnology.Typicalusesincludeautomaticallysynchronizingcontactandcalendarinformationamongdesktop,notebookandpalmtopcomputerswithoutconnectingcables.BluetoothcanalsobeusedtoaccessanetworkortheInternetwithanotebookcomputerbyconnectingwirelesslytoacellularphone.

DoyouKnowaboutOBEXProtocol?IrOBEX(shortlyOBEX)isasessionprotocoldevelopedbytheInfraredDataAssociation(IrDA)toexchangeobjectsinasimpleandspontaneousmanner.OBEX,whichprovidesthesamebasicfunctionalityasHTTPbutinamuchlighterfashion,usesaclientservermodelandisindependentofthetransportmechanismandtransportAPI,provideditrealizesareliabletransportbase.Alongwiththeprotocolitself,thegrammarforOBEXconversationsbetweendevices,OBEXalsoprovidesamodelforrepresentingobjectsandoperations.Inaddition,theOBEXprotocoldefinesafolderlistingobject,whichisusedtobrowsethecontentsoffoldersonremotedevice.Inthefirstphase,RFCOMMisusedassoletransportlayerforOBEX.

WhatisServiceDiscoveryProtocol?DiscoveryservicesarecrucialpartoftheBluetoothframework.Theseservicesprovidethebasisforalltheusagemodels.UsingSDP,deviceinformation,servicesandthecharacteristicsoftheservicescanbequeriedandafterthat,aconnectionbetweentwoormoreBluetoothdevicescanbeestablished.SDPisdefinedintheServiceDiscoveryProtocolspecification.

WhatisLinkManagerProtocol?ThelinkmanagerprotocolisresponsibleforlinksetupbetweenBluetoothdevices.Thisincludessettingupofsecurityfunctionslikeauthenticationandencryptionbygenerating,exchangingandcheckingoflinkandencryptionkeysandthecontrolandnegotiationofbasebandpacketsizes.

4/20/2015 SoftwareTesting:BluetoothInterviewquestionsandanswers

http://softwaretestersadda.blogspot.in/2012/12/bluetoothinterviewquestionsand.html 5/6

FurthermoreitcontrolsthepowermodesanddutycyclesoftheBluetoothradiodevice,andtheconnectionstatesofaBluetoothunitinapiconet.

IsitpossibletoconnectmultipleBluetoothhubs?No,onlyonehubcanbeusedatatimewithacomputer.USBorSerialdevicescanbeadded.

ListsomeTechnologycharacteristicofBluetooth?Omnidirectional,Adaptiveoutputpowertominimizeinterference,SupportSynchronous&asynchronousservices,FastFrequencyHoppingtoavoidinterference,Shortdatapacketstomaximizecapacityduringinterface.

Whatisthetotalnumberofmastersandslavesinapiconet?1Masterand7Slaves.

UnderwhatfrequencyrangedoesBluetoothwork?2.45GHzisthefrequencyrange.

WhatisthefrequencyrangeusedforBluetoothinEuropeandUnitedStates?2402MHzto2480MHzarethefrequencyrangesusedinUSAandEurope

WhatisthefrequencyrangeusedforBluetoothinJapan?2472to2497MHzisthefrequencyrangeusedforBluetoothinJapan.

WhatisPiconet?AcollectionofdevicesconnectedthroughBluetoothtechnologyinanadhocfashion.

WhatisaBluetoothdongle?Adevicethathangsoutsideofacomputer,orphonetoprovideBluetoothconnection.

WhycanBluetoothequipmentintegrateeasilyinTCP/IPnetwork?BecauseBluetoothuseswirelessLANstandardsIEEEfordatatransmission.

WhichmethodisusedforDatatransfer?AsynchronousConnectionless(ACL)isDatatransfermethodinBluetooth

GiveagenericdescriptionofBluetooth?Bluetoothisalowcost,shortrange(RF)linksbetweenmobilePCs,mobilephonesandotherportabledevices.Bluetoothcantransmitthroughsolid,nonmetalobjects.

HowdoesBluetoothusefrequencyhoppingforsecurity?Bluetoothpicksarandomfrequencyoutof79andthenhopsaroundtherangeabout1600timespersecond.

WhyisBluetoothcalledacablereplacementtechnology?BluetoothtechnologyallowsthecreationofPersonalAreaNetworkswithoutcablesorwiresthatareusualinhomenetworks.

WhatisFCCandhowdoesitrelatetoBluetooth?FCCisFederalCommunicationCommission,whichissueslicensestothestationsforspecificfrequencies.Italsodecideswhoisabletousewhichfrequencyforwhatpurpose.SinceBluetoothisusingunlicensedspectrum,FCChasnodirectinvolvementwithBluetooth

WhatisFECinBluetooth?ForwardErrorCorrectionisamethodbywhichBluetoothincreasesitsnoiseimmunity.FECisamethodthatenablesareceivertonotonlydetect,butalsocorrecterrorsinatransmission.

WhatisAirport?Airportisawirelesscommunicationssystem,likeBluetooth.ItisbasedontheIEEE802.11recommendation.Italsouses2.4GHzfrequencyband,butitsrangeisabout45metersanditboastsatransmissionspeedof11Mbit/second.ItisdevelopedbyLucentTechnologies.

WhichtechnologyisusedinBluetoothforavoidinginterference?FrequencyhoppingisthetechnologyusedinBluetooth.

HowmanySCOlinksarethereinapiconet?Inapiconet,therecanbeuptothreeSCOlinksof64,000bitspersecondeach.

WhichBluetoothversionusesadaptivefrequencyhopping?Why?InVersion1.2Adaptivefrequencyhoppingmethodisused,whichimprovesresistancetoradiointerference,andprovideshighertransmissionspeed.

IsitpossibletoconnectmultipleBluetoothhubs?No,onlyonehubcanbeusedatatimewithacomputer.USBorSerialdevicescanbeadded.

ListsomeTechnologycharacteristicofBluetooth?Omnidirectional,Adaptiveoutputpowertominimizeinterference,SupportSynchronous&asynchronousservices,FastFrequencyHoppingtoavoidinterference,Shortdatapacketstomaximizecapacityduringinterface.

WhichmethodisprimarilyusedforVoicetransfer?SynchronousConnectionOriented(SCO)isamethodprimarilyusedforVoicetransfer.

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Whatisthestrengthofthesignaltransmittedbypowerfulcellphones?Thepowerfulcellphonescantransmitasignalof3watts.

Whataretheother(competingornot)wirelesstechnologies?WiFi,IrDa,EDGE,UWB(UltraWideBand)

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