2-4 October 2007 Kigali, Rwanda ITU Forum “Bridging the ICT standardization & development gap” 3GPP and ITU-T Cooperation and IMS as a Core Element of NGN John Visser, P.Eng., Chairman, ITU-T SG 19 / Nortel Acknowledgement: Stephen Hayes Chair 3GPP TSG-SA / Ericsson
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2-4 October 2007Kigali, Rwanda
ITU Forum “Bridging the ICT standardization &
development gap”
3GPP and ITU-T Cooperation and IMS as a Core Element of NGN
John Visser, P.Eng.,Chairman, ITU-T SG 19 / Nortel
Acknowledgement: Stephen HayesChair 3GPP TSG-SA / Ericsson
2-4 October 2007Kigali, Rwanda
Outline
History of IMSIMS Adoption outside of 3GPPPreventing IMS FragmentationNext Steps for IMSConclusions
2-4 October 2007Kigali, Rwanda
Why 3GPP Developed IMS (1/2)
Development of IMS started around 2000
Term IMS was not coined until laterInput from 3G.IP and MWIF
Needed services to take advantage of higher bandwidths becoming availableIP transport becoming prevalent
2-4 October 2007Kigali, Rwanda
Why 3GPP Developed IMS (2/2)
SIP/SDP existed but was inadequate by itself
Insufficient operator controlNo standardized charging mechanismsMany regulatory requirements not met
Originally not viewed as a circuit switched replacement
2-4 October 2007Kigali, Rwanda
IMS Principles
IP based transportTailored for multimedia services
Home control of services Allows operator differentiationServices the same when roaming
Access independentSecurity at 3G levelRoaming fully supported
2-4 October 2007Kigali, Rwanda
3GPP IMS Timeline
3GPP specified IMS as part of Rel 5 with improvements in Rel 63GPP specified UMA as part of Rel 63GPP added support for I-WLAN in Rel 63GPP is enhanced IMS to support fixed broadband in Rel 73GPP added robustness enhancements for multimedia in Rel 73GPP added Voice Call Continuity in Rel 7
1999 2000 2001 2002 2003 2004 2005 2006
Rel 99 Rel 4 Rel 5 Rel 6 Rel 7
2007
2-4 October 2007Kigali, Rwanda
IMS
I-CSCF
I-CSCF
P-CSCF S-CSCFMw
HSS
Cx
Cx
Other IP/IMS network
Mm3GPP Cellular Access Network
3GPP GPRS
3GPP2 Cellular Access Network
3GPP2 MDN
WLAN Access Network
3GPP WLANinterworking
DSL Broadband Access Network
TISPAN
Gi,Go,Gx,GyR5
R6R6
R7
Cable Broadband Access Network
Cablelabs
R7
IMS adoption outside 3GPP: now being used for many access types
2-4 October 2007Kigali, Rwanda
Key Rationales forTransitioning to IMS
Mobile Operators – Deploy novel services to increase usageFixed Operators – Capex/Opex reduction and competitive service offeringsIntegrated Operators – Service continuity across domains
2-4 October 2007Kigali, Rwanda
Preventing IMS Fragmentation: IMS Variations Grow
IMS has been adopted by other SDOs as the basis of their solutions, but fragmentation still exists:
Problem: Different requirements and usage scenarios from different industry segmentsProblem: Unnecessary deviations in functions related to IMSProblem: Different SDOs interpret the base IMS Standards differently
2-4 October 2007Kigali, Rwanda
IMS Collaboration Workshops (1/2)
April 3-4, 2002 (Toronto, Canada) Agreed 3GPP2 would reuse 3GPP IMSAgreement on common IMS terminology
March 30-31, 2005 (Washington, DC)Agreement that TISPAN would reference 3GPP IMS specsAgreement to incorporate IMS changes into Rel 7Agreement on early production of TISPAN required specifications
2-4 October 2007Kigali, Rwanda
IMS Collaboration Workshops (2/2)
Sept 28-29, 2006 (Palm Springs, California)
Agreement to create open IMS requirements groupAgreement on submission process for Cablelabs enhancements
2-4 October 2007Kigali, Rwanda
3GPP Initiative: Open IMS
Goal: Provide a single “place” for industry segments to meet to discuss and standardize IMS requirementsSolution: 3GPP will host the open IMS group.SA1 (the 3GPP requirements group) has been re-scoped to address generic requirements (not only mobile requirements)
2-4 October 2007Kigali, Rwanda
3GPP Initiative: Open IMS
SA1:New Charter to cover requirements from any industry segmentNew ElectionsSpecial Fairness Rules (in process of being specified)Participation requires joining 3GPP (due to IPR concerns)http://www.3gpp.org/ftp/Op/OP_17/DOCS/OP17_07.zip
Rsrc & AdmissionNtwk AttachIMS i/f to Web svcsIMS O&MIMS Security
Ent i/f to IMSIMS Testing
Common IMS
Candidate areas for scope of Common IMS
IMS LIIMS Charging
IMS Emulation
Res i/f to IMS
Fully under 3GPPPartially under 3GPP
Not under 3GPP
2-4 October 2007Kigali, Rwanda
Progress so far
SA1 rechartered as new generic requirements group; 1st meeting heldJoint meeting: TISPAN WG1 and SA1 to transfer TISPAN deliverables.Requirements for fixed MM services transferred from TISPAN to 3GPPDiscussions starting with 3GPP2 on merging 3GPP2 IMS work back into 3GPP
2-4 October 2007Kigali, Rwanda
Next steps for 3GPP
Integrate variations from other SDOs into 3GPP IMS (and related common IMS areas)Continue work on CS to IMS service integrationEnsure all regulatory requirements met
2-4 October 2007Kigali, Rwanda
Next Steps for ITU-T and 3GPP
Concrete and fruitful interchange of views on cooperation, exchange of information, alignment of work plans and release datesInvestigating possibilities for closer coupling of 3GPP and ITU-T NGN-GSI
Target: globally consistent IMS specsCo-located meetings?3GPP under ITU-T umbrella?
2-4 October 2007Kigali, Rwanda
Summary and Conclusions (1/2)
IMS under development in 3GPP since 2000Originally viewed as a way to develop value added services using IP technologyWide acceptance of IMS as basis for multimedia IP networks
2-4 October 2007Kigali, Rwanda
Summary and Conclusions (2/2)
Open IMS and Common IMS are mechanisms to avoid IMS fragmentation; appear to be succeeding3GPP fully committed to ensure IMS meets the needs of all industry segmentsITU-T & 3GPP investigating approaches for closer integration in support of globally consistent IMS specs