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固网运营商基于软交换的NGN网络部署与实践的中期报告.docx

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固网运营商基于软交换的NGN网络部署与实践的中期报告 Introduction NGN(Next-generationnetwork)isavisionofaconvergedtelecommunicationsnetworkthatprovidesawiderangeofservices,includingvoice,data,andmultimedia.NGNisexpectedtoreplaceexistingPSTN(PublicSwitchedTelephoneNetwork)andotherlegacynetworkswithanewIP(InternetProtocol)basedinfrastructurethatcansupportarangeofadvancedservicesandapplications.TheNGNnetworkisbuiltontheconceptofasoftswitch,whichprovidestheabilitytocontrolandmanagethenetworkincludingtheabilitytoprovideservices,applications,andplatforms. ThisreportdiscussesthedeploymentofNGNbyfixed-lineoperatorsbasedonasoftwareswitchmodel.Weanalyzethetechnology,implementation,anddeploymentchallengesinthemid-termphasesofNGNdeployment. TechnologyOverview ThekeytechnologycomponentsoftheNGNnetworkinclude: 1.Softswitch:Asoftware-basedswitchthatprovidescallcontrol,signaling,andmediacontrol.ItisresponsibleforroutingandhandlingvoiceanddatatrafficusingIPprotocols. 2.MediaGateway:ThisisusedtointerfacebetweentheNGNnetworkandtheexistingPSTNandotherlegacynetworks.ItisresponsibleforconvertingthetrafficbetweendifferentprotocolsandformatssothatitcanbetransferredovertheNGNnetwork. 3.IMS(IPMultimediaSubsystem):ThisisaframeworkthatenablesthedeliveryofmultimediaservicesovertheNGNnetwork.TheIMSprovidestheinfrastructureforsupportingvoice,video,andothermultimediaapplications. DeploymentChallenges ThedeploymentofNGNbyfixed-lineoperatorspresentsseveralchallenges,including: 1.LegacyNetworkIntegration:TheintegrationoftheNGNwiththeexistingPSTNandotherlegacynetworksisacomplextaskthatrequirescarefulplanningandexecution. 2.MigrationStrategy:ThemigrationofcustomersfromthelegacynetworktotheNGNnetworkrequiresawell-definedstrategytoensurethecontinuityofserviceandminimizedisruption. 3.TechnologyChallenges:TheNGNnetworkrequiresasignificantinvestmentintermsofhardware,software,andinfrastructure.Thedeploymentofthenetworkmustbecarefullyplannedtoavoidtechnicalissuesanddelays. 4.Security:TheNGNnetworkisvulnerabletosecuritythreatssuchashac