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Open Standards and Interoperability for IP Multimedia Subsystem (IMS). Jonas SUNDBORG Director of Standardization and Regulation Telefonaktiebolaget LM Ericsson Group Function R&D, Standardization. Standards, open standards and interoperability

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open standards and interoperability for ip multimedia subsystem ims

Open Standards and Interoperability for IP Multimedia Subsystem (IMS)


Director of Standardization and Regulation

Telefonaktiebolaget LM EricssonGroup Function R&D, Standardization

Standards, open standards and interoperability

ETSI organized seminar, 26 May 2005, Sophia Antipolis, FR

  • Introduction
  • Characteristics of IP multimedia Subsystem (IMS)
  • Open standards for IMS
  • Interoperability (testing) of IMS and its applications
  • Conclusion
market acceptance of the open gsm standard with interoperability
Market Acceptance of the Open GSM Standard with Interoperability
  • GSM networks on air: 626
  • GSM countries/territories on air in all continents: 198
  • GSM total subscribers: 1,35 Billion*
  • Global monthly SMSs: 36/user
  • GSM accounts for 75% of the world\'s digital mobile market and 74% of the world\'s wireless market*

Source GSM A and CellularOnline. December 2004 and May 2005*

characteristics of ims
Characteristics of IMS
  • IMS, based on the 3GPP IMS architecture, will enable new person-to-person services, which will enrich the way that people communicate with each other combining voice, imaging and video within a single session.
  • SIP (Session Initiation Protocol) is the underlying protocol used to set-up and initiate the communication of session-based services.
  • Some examples of IMS based services
    • Push to talk over Cellular (PoC),
    • Combinational services (IMS services in addition to circuit switched voice),
    • Presence,
    • Instant Messaging,
    • Video telephony,
    • Multiplayer games,

where the session remains open although traffic may be sporadic.

ims in 3gpp release 5 frozen in march 2002
IMS in 3GPP Release 5Frozen in March 2002
  • IP Multimedia Subsystem (IMS) - Phase 1, basic
    • Basic architecture
    • Session Initiation Protocol (SIP) control
    • Session Definition Protocol (SDP) control
ims in 3gpp release 6 frozen in march 2005
IMS in 3GPP Release 6Frozen in March 2005
  • IP Multimedia Subsystem (IMS) - Phase 2, enhancements
    • 3GPP enablers for services like Push to Talk over Cellular (PoC)
    • Group Management
    • Conferencing
    • Messaging
    • Interworking with CS networks
    • Lawful intercept
ims in 3gpp release 7 draft
IMS in 3GPP Release 7Draft
  • IP Multimedia Subsystem (IMS) – further enhancements
    • Emergency calls
    • System enhancements for fixed broadband access to IMS
    • Multimedia telephony
  • Combination of CS bearers with IMS
  • Voice call continuity
ims interoperability testing principle
IMS Interoperability TestingPrinciple

Terminal A Network X Network Y Terminal B


Client Server Server Client

ims interoperability test activities overview
IMS Interoperability Test ActivitiesOverview
  • GSM Association
  • Open Mobile Alliance (OMA)
  • 3GPP - new
  • Bilateral vendor-to-vendor
ims sip interoperability trials gsm association
IMS/SIP Interoperability TrialsGSM Association
  • Establish trials involving operators, GRX carriers, infrastructure and terminal vendors
  • Basic SIP interoperability testing
  • Focus on technical and operational aspects of inter-working:
    • Demonstrate interoperability of IMS SIP-based services across different mobile networks, GRX backbone, and vendor IMS systems
    • Assess the level of maturity and availability of IMS-based network products
    • Gain practical experience of SIP-based applications
    • Produce guidelines for deployment
    • Highlight and forward any interoperability issues for resolution to appropriate Standards Development Organizations
ims sip interoperability trials gsm association1


Vendor X

Vendor Y


Carrier 

Carrier 





IMS/SIP Interoperability TrialsGSM Association
  • SIP based IMS services
    • E.g. OMA PoC, VoIP, real-time video sharing, gaming, instant messaging. …
  • First event in conjunction with the 3GSM World Congress in February 2005 in Cannes
  • Next event end of May in Asia
open mobile alliance oma testfests are interoperability testing events
Open Mobile AllianceOMA TestFests are Interoperability Testing Events

The objectives of the OMA TestFests are:

  • To verify the interoperability, stability and quality of the participating company implementations in a multi-vendor environment
  • Provide feedback on implementation and operational issues to OMA members developing the specifications, and
  • Provide a peer-to-peer networking environment for participants to improve their own implementations and their contributions to the OMA specifications
interoperability testing of poc oma
Interoperability Testing of PoCOMA
  • Example: OMA PoC “TestFest”
    • First “TestFest” held 16-20 May in Helsinki
      • Hosted by TeliaSonera
      • Several client and server implementations
      • Client to server, server to server and server to client
3gpp interoperability testing
3GPP Interoperability Testing
  • Proposal: 3GPP to set up interoperability testing activities for specific, new services/features, e.g
    • CS bearers combined with IMS
  • NB! This is different compare to the already well established work on conformance test specifications.
  • GSM, 3G, IMS, PoC, …, are all examples of open standards with interoperability
  • Telecom industry wide standardized end-to-end services including interoperability testing is a key element in ensuring operational excellence in a multi-vendor and multi-operator environment
  • Enhancements/improvements of the standardization process and interoperability testing through evolutionary steps – rather than revolution!
  • Natural evolution: 3GPP start interoperability testing activities for specific, new features/services; e.g. CS bearers combined with IMS