Session 1 Ims Alternatives

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  • Session 1 Ims Alternatives

    1. 2. IMS Alternatives? <ul><li>IMS hasn’t maintained momentum </li></ul><ul><ul><li>Not publicly </li></ul></ul><ul><li>It’s complicated </li></ul><ul><ul><li>Getting more complicated all the time </li></ul></ul><ul><li>Rise of “over the top” web applications </li></ul><ul><ul><li>Bypassing IMS </li></ul></ul><ul><li>Considerable opposition from online community </li></ul><ul><li>SIP network architecture </li></ul><ul><li>Web 2.0 innovation and mashups </li></ul>
    2. 3. IMS Alternatives <ul><li>Colin Pons, KPN: </li></ul><ul><ul><li>“ I wonder if IMS may prove to be a modern day Titanic” </li></ul></ul><ul><li>Chris Gatch, VP & CTO, C-Beyond Communications Inc </li></ul><ul><ul><li>“ Let’s face it, IMS is on life support, and it’s about time we pulled the plug” </li></ul></ul><ul><ul><ul><li>Let’s discuss – see the article </li></ul></ul></ul><ul><ul><ul><ul><li>http://businessvoip.tmcnet.com/topics/trends/articles/28844-why-mobile-sip-will-surpass-ims.htm </li></ul></ul></ul></ul>
    3. 4. IMS Alternatives Issue Response Major Pushed by ILECs / Tier 1s SIP moving to mobile, so no need for IMS Minor ATM vs Ethernet Specifications, acronyms and abbreviations Behaviour of vendors – a bandwagon Equipment based on SIP became IMS compatible overnight
    4. 5. IMS Alternatives Issue Response Major Pushed by ILECs / Tier 1s To be expected, it’s mostly large operators that have complex networks SIP moving to mobile, so no need for IMS SIP is IMS Minor ATM vs Ethernet ATM was necessary for access and transport until fast Ethernet could be delivered reliably Specifications, acronyms and abbreviations So what? Behaviour of vendors – a bandwagon To be expected Equipment based on SIP became IMS compatible overnight Precisely.
    5. 6. IMS Alternatives <ul><li>Gatch: </li></ul><ul><ul><li>“ The logical conclusion is that we’ll arrive at a single protocol and architecture for mobile and fixed broadband environments” </li></ul></ul><ul><ul><li>“ IMS concepts help mainstream VoIP” </li></ul></ul><ul><ul><li>“ I have no doubt the concept will survive in a standalone form in emerging mobile VoIP networks” </li></ul></ul>
    6. 7. IMS Alternatives <ul><li>IMS is controversial </li></ul><ul><li>Let’s consider alternatives and enhancements </li></ul>
    7. 8. IMS Alternatives REF: Magedanz, 2006
    8. 9. Peer2Peer <ul><li>SIP provides a complete framework </li></ul><ul><li>IMS architecture leverages best of SIP </li></ul><ul><ul><li>CSCF is SIP proxy </li></ul></ul><ul><ul><li>Application Server is SIP AS </li></ul></ul><ul><ul><li>HSS is SIP Registrar </li></ul></ul><ul><ul><li>Gateway functions are SBCs or Media Proxies </li></ul></ul><ul><li>SIP Peer to Peer network is less complex and offers scalability </li></ul><ul><li>Promising alternative </li></ul><ul><ul><li>Particularly for OLO / Alt net or greenfield </li></ul></ul>
    9. 10. Peer2Peer <ul><li>IMS builds on legacy standards and interfaces </li></ul><ul><li>Most operators have embedded solutions </li></ul><ul><ul><li>Depreciated, but still active and essential </li></ul></ul><ul><li>Centralised service deployment using stateful servers </li></ul><ul><li>Legacy network interconnection </li></ul><ul><ul><li>IN triggers </li></ul></ul><ul><ul><li>User access to IMS or legacy services </li></ul></ul><ul><li>Access ownership rights </li></ul><ul><ul><li>Spectrum, last mile </li></ul></ul><ul><li>Policy control and rules </li></ul><ul><ul><li>Fixed, mobile, nomadic customers </li></ul></ul>
    10. 11. Peer2Peer REF: AG Projects, 2008 http://www.ag-projects.com/images/stories/ag_images/msp-big.png
    11. 12. What About SDPs? <ul><li>Service Delivery Platform </li></ul><ul><ul><li>“ combination of systems and capabilities implemented by an operator to enable to total end-to-end delivery of value added services and content. The execution platforms that are components of the SDP (and often erroneously referred to as SDPs themselves) need to become IT orientated and operators will need to extend or replace their intelligent network platforms to encompass and exploit and integrate the new IP architectures ” </li></ul></ul><ul><ul><ul><li>James Aitken, Aepona, 2005 </li></ul></ul></ul>
    12. 13. SDP without IMS <ul><li>Use SDP for service creation and deployment </li></ul><ul><li>SDP provides connectivity to Content (external, internal) </li></ul><ul><li>SDP provides integration with network OSS / BSS </li></ul><ul><ul><li>Billing, reporting and systems inventory </li></ul></ul><ul><li>Use devices for network connectivity </li></ul>
    13. 14. SDPs without IMS Service Delivery Platform Network Operations Business Operations Marketing IT Service Enablers - IN, SMSC, MMSC, Presence, Location, HSS, CSCF, PoC, … BSS OSS Service Providers End Users Content Providers Devices Radio access network Broadband access network Legacy access network Telecom Services REF: OSS Observer 2007 Core Network
    14. 15. SDP without IMS REF: Magedanz, 2006
    15. 16. SDP without IMS <ul><li>No standardisation in SDP realm </li></ul><ul><li>BSS / OSS integration </li></ul><ul><li>No standardised policy / admission control </li></ul><ul><li>Interop issues </li></ul>
    16. 17. What About SDPs? Service Delivery Platform Network Operations Business Operations Marketing IT Service Enablers - IN, SMSC, MMSC, Presence, Location, HSS, CSCF, PoC, … BSS OSS Service Providers End Users Content Providers Devices Radio access network Broadband access network Legacy access network Telecom Services Source: OSS Observer, 2007 Core Network
    17. 18. What About SDPs? REF: Nuno Silva, PT Inovacao, IMS World Forum, 2008
    18. 19. What About SDPs? REF: Nuno Silva, PT Inovacao, IMS World Forum, 2008
    19. 20. What About SDPs? REF: Nuno Silva, PT Inovacao, IMS World Forum, 2008
    20. 21. What About SDPs? REF: Nuno Silva, PT Inovacao, IMS World Forum, 2008
    21. 22. What about SDPs? <ul><li>The IP Multimedia CN subsystem comprises all CN elements for provision of multimedia services. This includes the collection of signalling and bearer related network elements </li></ul><ul><ul><li>TS 23.228-830, December 2007 </li></ul></ul>
    22. 23. SDP with IMS <ul><li>IMS provides common layer for network connectivity, admission control and abstraction </li></ul><ul><li>SDP manages OSS / BSS </li></ul><ul><li>IMS and SDP are complementary </li></ul><ul><li>IMS is thus a vital component of an operator’s overall SDP framework </li></ul>
    23. 24. SDP with IMS REF: Magedanz, 2006
    24. 25. IMS with ASC <ul><li>Goal – enable IMS clients to access legacy applications </li></ul><ul><li>Combines multiple protocol elements with abstraction layers to interface to applications </li></ul><ul><li>Proprietary platform proposed by App Trigger </li></ul>
    25. 26. IMS with ASC REF: AppTrigger 2007
    26. 27. IMS with SCIM <ul><li>Service Capabilities Interaction Manager (SCIM) </li></ul><ul><li>Emerging function designed to manage interaction between different application servers that may be involved in the same application session </li></ul><ul><li>Each may support different capabilities required by an application </li></ul><ul><ul><li>E.g. PTT – presence, conferencing, floor control </li></ul></ul><ul><li>May be standalone, or embedded into AS or S-CSCF </li></ul><ul><li>Owes much to SOA principles </li></ul><ul><ul><li>Orchestration of processes in services </li></ul></ul>
    27. 28. IMS with SCIM REF: https://udn.devconnectprogram.com/products/whitepapers/final-wp_scim-092007-lb3700.pdf
    28. 29. IMS with AGCF <ul><li>Access Gateway Control Function </li></ul><ul><li>IMS already specified MGCF, but didn’t address access gateways for preservation of legacy services </li></ul><ul><li>TISPAN alignment requires this </li></ul><ul><li>AGCF performs this task </li></ul><ul><ul><li>Class 5 features </li></ul></ul><ul><ul><li>H.248 control to devices, SIP to IMS core </li></ul></ul>
    29. 30. IMS with AGCF PSTN/ISDN Specific logic/data Reference points Dxx : DIAMETER Sxx : SIP or SIP-I Hxx : H.248 Ixx : TISPAN specific REF: France Telecom R&D 2004
    30. 31. IMS Alternatives <ul><li>IMS picture is still evolving </li></ul><ul><li>Not the only answer </li></ul><ul><li>Where is it headed? </li></ul>

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