2011官方Wifi-Direct协议介绍

Wi-FiDirect™Overview104Wi-FiAlliance,April2011OverviewofWi-FiP2PTechnology•TheWi-FiAlliancehasdevelopedaspecification,calledthe“Wi-FiAlliancePeer-to-Peer(P2P)Specification”,definingdirectWi-Ficonnectionsbetweenclientdevices•Thispresentationuses“Wi-FiP2P”asanabbreviationforthetechnology•Wi-FiDirect™isthebrandednameforthistechnology–MembersareabletocertifytheirdevicesfortheWi-FiAllianceWi-FiP2Pcertificationprogram–OnlydevicescertifiedforWi-FiP2PmayusetheWi-FiDirect®brandandsupportingmarketingmaterial105Wi-FiAlliance,April2011Introduction•ThispresentationprovidesanoverviewofWi-FiP2Ptechnology–W-FiAllianceprovidesNOGUARANTEEofthecompletenessoraccuracytowhichthistrainingmaterialrepresentsthepublishedWi-FiP2Pspecificationorthetestplan–Detailsofprerequisitecapabilitiesshallnotbediscussed•Wi-FiP2Ptechnologyassumesthefollowingcertifiedproductcapabilities–Wi-Ficertificationforatleast802.11g(includingsupportforWPA2™security)–Wi-FiProtectedSetup™(WPS)–Wi-FiMultimedia™QualityofService(WMM®)Referencematerial:SpecificationWi-FiAllianceMember(Loginrequired)Non-member(Purchaserequired)Wi-FiP2PV1.1Downloadforfreefrom://=4Wi-FiProtectedSetupV1.0WMMV1.2WPA2V3.1106Wi-FiAlliance,April2011Wi-FiP2PProgramObjectives•Provideaneasyandconvenientmannertoshare,show,printandsynchronizecontentwhereverusersgo–home,publicplaces,travel,work•Providenewconnectivityscenariosthatincludethe100‟sofmillionsofWi-FiCERTIFIED™devicesthatusersalreadyown•Broad-basedsolutionthatmakesWi-Fiusageaspervasiveforpeer-to-peerconnectivityasitisforlocalareanetworks•Deliveranindustry-widepeer-to-peersolutionbasedonbroadlydeployedWi-Fitechnologies107Wi-FiAlliance,April2011ExampleP2PUseCasesLaptopTVProjectorCameraCameraPrinterLaptopPicturesPhoneLaptopLaptopLaptop108Wi-FiAlliance,April2011Wi-FiDirect™Training:Wi-FiP2PTechnologyFundamentalsTopicWi-FiP2PTechnologyOverviewWi-FiP2PFrameworkWi-FiP2PArchitecture(P2PDevice,P2PGroup,P2PGroupOwnerWi-FiP2PProtocolOverview109Wi-FiAlliance,April2011Wi-FiP2PTechnologyOverview•AWi-FiP2Pnetworkisanon-infrastructureconnectionofWi-FiCERTIFIED™devices•KeyfeaturesofWi-FiP2Pnetworks–Thesamegold-standardWi-Ficapabilitiesasinfrastructurenetworks•Full,robustWPA2™securityusingAES•TypicalWi-Fidatarates(upto802.11n)•TypicalWi-Firange•Supportfor2.4GHzand5GHzdevices•Simple,securedeviceauthenticationandenrollmentviaWi-FiProtectedSetup™(WPS)•Excellentco-existencewithneighboringnetworks•CompatiblewithexistingWi-FiCERTIFIED™devices•Additionalfeatures•IPaddressbased•Automaticdevicediscovery•Deviceserviceadvertisement•Supportfordevicepowermanagement•Supportfortemporary(one-time)andpersistent(many-time)networkconnections•Optionalcross-connectiontoinfrastructurenetwork•Enterprisemanageability110Wi-FiAlliance,April2011Wi-FiP2PFramework•AP2PGroupisaWi-FiP2Pnetworkthatmayincludetwotypesofdevices–P2PDevice–Wi-FiCERTIFIED™devicethatiscompliantwiththeWi-FiP2Pspecification–Legacydevice–Wi-FiCERTIFIED™devicethatisnotcompliantwiththeWi-FiP2Pspecification•P2PdevicesmustbecapableoftwodifferentrolesinaP2PGroup–P2PGroupOwner:An“AP-like”capabilitythatcontrolsaWi-FiP2PGroupandenablesP2PDeviceconnectivity–P2PClient:AWi-FiP2P-compliantdevicethatmayconnecttoaP2PGroupOwner•Note:LegacydevicesmayonlyfunctionasclientsinaP2PGroup.TheyseeP2PGroupOwnersasAPs.111Wi-FiAlliance,April2011Wi-FiP2PArchitecture:P2PDevice•AP2PDeviceisthefundamentalcomponentofaP2PGroup–CapableofeitheraninfrastructureoraP2Pconnection–CanalwaysconnectwithanotherP2PDevice–SupportsbothP2PGroupOwnerandP2PClientroles–NegotiatesP2PGroupOwnershipwithotherP2PDevices–MustbeWi-FiCERTIFIED™forWi-FiProtectedSetup™–MustbeWi-FiCERTIFIED™forWMM®–MustSupportP2PDiscoverymechanisms–MustSupportP2PPowerManagementmechanisms–MaysupportManagedP2PDeviceoperation–MaysupportWLANandP2PGroupoperationatthesametime–MayoperateasamemberofmultipleP2PGroupssimultaneously–Functionalityisoutofscopeforthisspec112Wi-FiAlliance,April2011Wi-FiP2PArchitecture:P2PGroup•AP2PGroupisaWi-FiP2PnetworkmadeofatleasttwoWi-Fienableddevices–OnedevicemustbeaP2PGroupOwner–Theotherdevice(s)areClients(P2PClientsand/orLegacyClients)•TwotypesofP2PGroups–1:1P2PGroup•OneP2PGroupOwnerandoneClient–1:nP2PGroup•OneP2PGroupOwnerandnClients(wherenmaybeanycombinationofP2PClientsandLegacyClients)P2PGroupOwnerP2PClientP2PGroupOwnerP2PClientLegacyClientClient1:1P2PGroup1:nP2PGroup113Wi-FiAlliance,April2011Wi-FiP2PArchitecture:P2PGroup•AP2PGroupfunctionssimilarlytoaninfrastructureBSS–HasasingleSSID(theP2PwildcardSSID)andasinglesecuritydomain–MayhaveonlyoneP2PGroupOwner–P2PGroupOwnerhasasimilarroleasanAccessPoint(AP)–Client(s)havesimilarrolesasstation(s)(STAs)•EachP2PGrouphasauniqueP2PGroupID•EachP2PGroupmaybetemporary(single-use)orpersistent(repeateduse)UserconnectstoakioskinastoreUsercreatesapersistentP2PGroupwiththeirhomeprinterPersistentP2PGroupTemporaryP2PGroup114Wi-FiAlliance,April2011P2PArchitecture:P2PGroupOwnerandP2PClient•KeyP2PGroupOwnercapabilities–MustprovideB