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Services in UMTS Networks

Services in UMTS Networks. per.johansson@ericsson.com. Outline. UMTS Architecture Overview GPRS Mobility and Roaming GPRS QoS IP Multimedia Subsystem Home Network Environment Open Service Access -- OSA Relation to ISP structure. UMTS Architecture Overview.

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Services in UMTS Networks

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  1. Services in UMTS Networks per.johansson@ericsson.com

  2. Outline • UMTS Architecture Overview • GPRS Mobility and Roaming • GPRS QoS • IP Multimedia Subsystem • Home Network Environment • Open Service Access -- OSA • Relation to ISP structure

  3. UMTS 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 domains

  4. Subscription Mgmt • Home Services TE MT E2E Applications • Routes Calls/Data E2E • Local Services Radio Access • Radio Resource Mgmt • Core Network Access • Data transport to remote party • Non-user specific information UMTS Architecture - (Physical) Domains

  5. Network n-2 connectivity Network n-1 connectivity Link functions Link functions Infrastructure n-2 Infrastructure n-1 Network Strata…what’s that? • A (telecom?) way to abstract the notion “networks of networks” • Stratified Reference Model -- SRM 7 Example: 6 IP 5 Network Stratum n-1 Network Stratum n-2 4 ATM VP/VC Network n connectivity Network Stratum n SONET/SDH Link functions Infrastructure n DWDM Etc... Network n Network n-1 Network n-2

  6. 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 functions Strata -- Functional Aspects of UMTS Stratum: Grouping of protocol layers providing a specific service

  7. Application Stratum • Applications provided to the end user • Applications may be within or outside the scope of UMTS • PS and CS based applications Note!

  8. Packet 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 equipment PDN (e.g. IP Network) GSM BSS PS Domain Home Domain Core Network ME CS Domain PSTN UMTS RNS (UTRAN)

  9. GPRS -- 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!

  10. GPRS user plane for GSM and UMTS access GSM UMTS

  11. GPRS Mobility GTP Tunnels redirect traffic!

  12. GPRS Roaming: two alternative ways “Home” Services • 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 tunnels ISP ISP Home Services Local Services ME PLMN B

  13. GGSN Roaming Agreement SLA Roaming Agreement SLA SLA Roaming Agreement PLMN Roaming: GPRS Roaming eXchange -- GRX • 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. PLMN1 (Home) BG DNS R GRX PLMN2 (Visited) PLMN3 R R BG BG ME PLMN 1 DNS DNS SGSN SGSN

  14. GGSN Roaming Brokering • 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, Roaming Brokering] PLMN1 (Home) BG DNS Roaming Agreement SLA R GRX PLMN2 (Visited) PLMN3 R R BG BG ME PLMN 1 DNS SLA SLA DNS Roaming Broker Roaming Agreement Roaming Agreement SGSN SGSN

  15. Operator A GGSN BG DNS DNS DNS R R R GRX GRX Operator C Operator C R R R R BG BG DNS DNS SGSN SGSN Global GRX network • Next level of peering GRX-GRX • Biggest peering point AMS-IX • Now 17 GRXes: Aicent, Belgacom, Cable & Wireless, Carrier1, Comfone/Infonet, Deutsche Telekom, Ebone, Energis, France Telecom, Global Crossing, KPNQwest, Sonera/Equant, Telecom Italia, Telenor, Telia, Telecommunications Services Inc, WorldCom Operator C BG DNS GPRS Peering Network SGSN GRX R DNS .gprs R

  16. UMTS QoS Architecture External IP QoS (e.g. RSVP/Diffserv) • End-to-End approach UMTS QoS

  17. IP vs. UMTS QoS • Policy Enforcement Point • Diffserv edge function • RSVP sender/receiver proxy • Mapping between IP and UMTS bearer QoS • UMTS QoS classes • Conversational class • Streaming class • Interactive class • Background

  18. IP Multimedia (IM) Domain • Support for real time multimedia services • Combined support from PS and CS bearer services IM Domain PDN (e.g. IP Network) GSM BSS PS Domain Home Domain Core Network ME CS Domain PSTN UMTS RNS (UTRAN)

  19. IP Multimedia Subsystem • SIP based signaling • Separate overlay network for MM support

  20. UMTS Virtual Home Environment • Provides portability for the Personal Service Environment • Users presented with same personalized features regardless of network and terminal • VHE components • User Profile • Generic QoS bearer services • Call control (e.g. IMS) • Service Toolkits • CAMEL* (IN in GSM) • OSA (API for 3rd party service development) *CAMEL: Customized Application for Mobile Network Enhamced Logic

  21. User Profile(s) • The user profile aspects • Classification (personal and service specific) • Location and distribution • Mgmt and access • Policies • Synchronization • Security and privacy • Format

  22. 3G Operator’s “Export Products” • Offered: • Large customer base! • IP connectivity • Controlled QoS (MM apps etc.) • User location (geographic, network) • Global Mobility and Roaming • VHE • Security • Application based charging • VPN access • What have 3G operators to offer Service Providers? • 3rd party involvement of Internet based service providers seen as essential for growth Service & Application providers “Basic” Services Core Network RAN “Internet” MS GPRS • In return: • Reach internet content • Shared risks • Faster application development • Reach customers via other ISPs (accesses)

  23. How to “export” the “3G functionality package”? • The IN way too expensive... • Compare number of SS7 developers with Java/HTML developers! • IP transport and open interfaces enables • Shared computing platforms for telecom and Internet applications • Shared (IP) infrastructure • Integration of IDCs and telecom hotels (Note! Still Carrier Class performance and availability) • Globally distributed “Home” servers… • => Expected to give fast and cheap development for 3G applications!

  24. OSA - Open Service Access • Part of the “Virtual Home Environment” • Open, standardized API for 3rd party application developers • Developed in the Parlay group • “Exports” typical Mobile Network Functionality • Call control, UMTS QoS • User location, Terminal capabilities • Content based charging

  25. OSA - Open Service Access • Applications: • VPN • Conferencing • Location based applications • …. • Framework mechanisms: • Authentication • Discovery of service capabily features • Network Service Capability Features: • (Abstractions of network functionality) • Call control • User location • Terminal capabilities • Charging

  26. OSA and Server distribution • Actual servers and the SCS may be distributed • Optional to run on the same physical server or in one or more separate • Implications for application server placement in the network?

  27. Cable Modem Premises- based AccessNetworks LAN Transit Net LAN LAN Private Peering Premises- based Core Networks Transit Net WLAN WLAN Internet Datacenter NAP Analog WLAN Transit Net Public Peering DSLAM Operator- based RAS Regional Wireline Regional Cell H.323 Data Cell Data H.323 Cell PSTN Voice Voice So does all this fit into an Internet Service Architecture?

  28. service/content service/content cacheing cacheing hosting hosting data center data center OSA “Exported”? FW FW FW FW FW FW FW FW service network service network S G G S S G GPRS operators -- MO needs to adapt to this GPRS operator PS CN IX backbone provider backbone provider e.g., modem pool or CATV access operator backbone provider IX GPRS operator service/ content GPRS operator link The NO PS CN PS CN BGP-relation

  29. Issues • Performance implications on GTP tunneling and IMS backbone VPNs? • Will application developers buy into the OSA idea? • How easy will it be for current SPs to offer applications to mobile customers? • Can OSA be easily distributed? • Alternatives? • Direct Internet access from mobiles… • Service adaptation in overlay networks • Mobile IP? • Specialized Radio QoS overlay support network?

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