Services in UMTS NetworksOutlineUMTS Architecture OverviewUMTS Architecture - (Physical) DomainsNetwork Strata…what’s that?Strata -- Functional Aspects of UMTSApplication StratumPacket Switched and Circuit Switched DomainsGPRS -- Generic Packet Radio ServiceGPRS user plane for GSM and UMTS accessGPRS MobilityGPRS Roaming: two alternative waysPLMN Roaming: GPRS Roaming eXchange -- GRXPowerPoint PresentationSlide 16UMTS QoS ArchitectureIP vs. UMTS QoSIP Multimedia (IM) DomainIP Multimedia SubsystemUMTS Virtual Home EnvironmentUser Profile(s)3G Operator’s “Export Products”How to “export” the “3G functionality package”?OSA - Open Service AccessSlide 26OSA and Server distributionSo does all this fit into an Internet Service Architecture?GPRS operators -- MO needs to adapt to thisIssuesRev PA1 2/25/02 1Services in UMTS [email protected] PA1 2/25/02 2Outline•UMTS Architecture Overview•GPRS Mobility and Roaming•GPRS QoS •IP Multimedia Subsystem•Home Network Environment•Open Service Access -- OSA•Relation to ISP structureRev PA1 2/25/02 3UMTS Architecture Overview•An implementation of the IMT-2000 requirements–WCDMA radio access–Higher rates and QoS•Major effort: Provide Internet oriented services!–SIP based multimedia support–Open interfaces•Modular approach –Allows for independently evolving network components•Physical entities grouped into Domains•Grouping of protocols offer services in Strata–Provided by one or several domainsRev PA1 2/25/02 4UMTS Architecture - (Physical) DomainsUser EquipmentDomainAccessNetworkDomainCoreNetworkDomainInfrastructureDomainCuMobileEquipmentDomainUSIMDomainHomeNetworkDomainTransitNetworkDomainUuIu[Zu][Yu]ServingNetworkDomainTEMTRadio AccessE2E Applications•Radio Resource Mgmt•Core Network Access•Routes Calls/Data E2E•Local Services•Subscription Mgmt•Home Services•Data transport to remote party•Non-user specific informationRev PA1 2/25/02 5Network Strata…what’s that?•A (telecom?) way to abstract the notion “networks of networks”•Stratified Reference Model -- SRMInfrastructure nNetwork nLink functionsNetwork n connectivity4567Infrastructure n-1Link functionsNetwork n-1 connectivityNetwork n-1Network Stratum nInfrastructure n-2Link functionsNetwork n-2 connectivityNetwork Stratum n-1Network Stratum n-2Network n-2IPEtc...ATM VP/VCSONET/SDHDWDMExample:Rev PA1 2/25/02 6Strata -- Functional Aspects of UMTSStratum: Grouping of protocol layers providing a specific service USIMMT - ANMT/MEAccessNetworkDomainServingNetworkDomainHomeNetworkDomainAN - SN“Access Stratum”MT - SN“Serving Stratum”USIM - HNSN - HN“Home Stratum”MT - SNUSIM - MT“Transport Stratum”USIM - MT•Authentication•Mobility Mgmt•Billing/charging•Home specific services•Routing from source to destination•Mobility Mechanisms•Telecom services (local/generic)•Transport user/signaling data•ARQ FEC•Data adaptation for network access•Access technique specific functionsRev PA1 2/25/02 7Application StratumTEMT - ANMTAccessNetworkDomainServingNetworkDomainTransitNetworkDomainAN - SN“Access Stratum” TE - MTMT - SN“Serving Stratum”Application StratumApplication“Transport Stratum”RemotePartyMobileEquipmentDomain•Applications provided to the end user•Applications may be within or outside the scope of UMTS•PS and CS based applicationsNote!Rev PA1 2/25/02 8UMTS RNS (UTRAN)GSM BSSPacket Switched and Circuit Switched Domains•One PLMN (Public Land Mobile Network) is One Mobile Operator•Migration from GSM to UMTS crucial•Coexistence over long period foreseen •Multimode mobile equipmentPDN(e.g. IP Network)PSTNCore NetworkPS DomainCS DomainMEHome DomainRev PA1 2/25/02 10GPRS -- Generic Packet Radio Service•Introduces Packet Switching to Cellular Networks -- the 3GPP way!•Concept: Hide cellular specifics from the legacy PS (PDN) domain•Migrate from GSM to UMTS access with the same GPRS Core Network•Use legacy PDN as infrastructure for the CN•Many design decisions made “pre-Internet boom” -- IP not given! PANMSTEBluetoothBTSBSCMSC/VLRHLRBGOther GPRSOperatorPSTNNetworkDNSGGSNBackboneNetworkIPSGSNPTM-SCCorporateNetworkInternetRASRADIUSFWRouterDNSDHCPGMSCISP NetworkRev PA1 2/25/02 11GPRS user plane for GSM and UMTS accessL1RLCPDCPMACE.g., IP,PPPApplicationL1RLCPDCPMACATMUDP/IPGTP-UAAL5RelayL1UDP/IPL2GTP-UE.g., IP,PPP3G-SGSNUTRANMSIu-PSUuGnGi3G-GGSNATMUDP/IPGTP-UAAL5L1UDP/IPGTP-UL2RelayRelayNetworkServiceGTP-UApplicationIPSNDCPLLCRLCMACGSM RFSNDCPLLCBSSGPL1bisRLCMACGSM RFBSSGPL1bisRelayL2L1IPL2L1IPGTP-UIPUmGbGnGiMSBSSSGSNGGSNNetworkServiceUDPUDPGSMUMTSRev PA1 2/25/02 12GPRS Mobility LA1, RA1 MSHLR/AuC old SGSN GGSN LA2, RA2 new SGSNtarget RNCsource SRNCnew MSC/VLRold MSC/VLR LA1, RA1 MSHLR/AuC old SGSNsource RNC GGSN LA2, RA2 new SGSNtarget SRNCold MSC/VLRnew MSC/VLR LA1, RA1HLR/AuC old SGSN GGSN LA2, RA2 new SGSNsource SRNCnew MSC/VLRold MSC/VLR MStarget RNCGTP Tunnels redirect traffic!Rev PA1 2/25/02 13GPRS Roaming: two alternative waysBGSGSNBGSGSNGGSNGGSNSGSNIntra-PLMN BackboneIntra-PLMN BackboneGiGpGiPLMN APLMN BPacket Data Network (IP)Inter-PLMN BackboneME PLMN B•ISP Roaming–Visited GGSN the network access–Services Internet based–Gives more optimal routing–No static IP addresses•PLMN Roaming–Home GGSN the network access–Operator based services.–Collection of charging data in home PLMN–Additional screening in Home GGSN–Access to all services and networks that are available in the Home network–Needs Inter-PLMN GPRS Backbone Network for GTP tunnelsISPISPHome ServicesLocal Services“Home” ServicesRev PA1 2/25/02 14PLMN Roaming: GPRS Roaming eXchange -- GRXPLMN2 (Visited)PLMN1 (Home)GGSNSGSNDNSDNSBGBGPLMN3SGSNDNSBGGRXRRR•Provides secure and QoS based (VPN) operator roaming (GTP tunneling)•.gprs root DNS services•BGP-4 routing (PLMN=AS)•Support for peering: p2p Roaming Agreements still needed.ME PLMN 1Roaming AgreementRoaming AgreementRoaming AgreementSLA SLA SLARev PA1 2/25/02 15Roaming BrokerRoaming BrokeringPLMN2 (Visited)PLMN1 (Home)GGSNSGSNDNSDNSBGBGPLMN3SGSNDNSBGGRXRRR•Centralized handling of roaming relations•Broker acts as full HPLMN and VPLMN w.r.t. contractual relationship.•Peered roaming big hurdle for new operators•Claim: Enables 3G roaming to scale •Claim: Brokering enables fast time-to-market•Example: Comfone/Infonet => [GRX on IPoATM backbone, Roaming Agreement support services,
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