Transcript Open standards and interoperability for IP - Docbox

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
ETSI organized seminar, 26 May 2005, Sophia Antipolis, FR
Outline
 Introduction
 Characteristics of IP multimedia Subsystem (IMS)
 Open standards for IMS
 Interoperability (testing) of IMS and its applications
 Conclusion
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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*
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Characteristics of IMS

IMS, based on the 3GPP IMS architecture, will enable new person-toperson services, which will enrich the way that people communicate with
each other combining voice, imaging and video within a single session.
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SIP (Session Initiation Protocol) is the underlying protocol used to set-up
and initiate the communication of session-based services.
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Some examples of IMS based services
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–
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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.
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IMS in 3GPP Release 5
Frozen in March 2002
 IP Multimedia Subsystem (IMS) - Phase 1, basic
– Basic architecture
– Session Initiation Protocol (SIP) control
– Session Definition Protocol (SDP) control
– …
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IMS in 3GPP Release 6
Frozen in March 2005
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IP Multimedia Subsystem (IMS) - Phase 2, enhancements
–
3GPP enablers for services like
Push to Talk over Cellular (PoC)
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Group Management
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Conferencing
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Messaging
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Interworking with CS networks
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Lawful intercept
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3GPP IMS Release 6 Architecture
TS 23.002 v.6.7.0
IP Multimedia Networks
Legacy mobile
signalling Networks
PSTN
Mb
Mb
PSTN
BGCF
PSTN
CSCF
Mk
Mm
Mk
Mw
Mj
BGCF
C, D,
Gc, Gr
Mi
Cx
IMSMGW
MGCF
CSCF
Mg
Mn
Mr
Mb
MRFP
MRFC
Mb
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Dx
Mw
P-CSCF
Gm
Mp
Mb
HSS
Gq
Mb
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SLF
UE
IM Subsystem
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IMS in 3GPP Release 7
Draft
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IP Multimedia Subsystem (IMS) – further
enhancements
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Emergency calls
System enhancements for fixed broadband
access to IMS
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Multimedia telephony
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…
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Combination of CS bearers with IMS
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Voice call continuity

…
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IMS Interoperability Testing
Principle
Terminal A
Network X
UNI
Client
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Network Y
NNI
Server
UNI
Server
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Terminal B
Rev A
Client
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IMS Interoperability Test Activities
Overview
 GSM Association
 Open Mobile Alliance (OMA)
 3GPP - new
 Bilateral vendor-to-vendor
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IMS/SIP Interoperability Trials
GSM Association
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Establish trials involving operators, GRX carriers, infrastructure and
terminal vendors
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Basic SIP interoperability testing
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Focus on technical and operational aspects of inter-working:
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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
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Gain practical experience of SIP-based applications
Produce guidelines for deployment
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Highlight and forward any interoperability issues for resolution to
appropriate Standards Development Organizations
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IMS/SIP Interoperability Trials
GSM 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
 …
A
Vendor X
IMS
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Carrier 
GRX
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Carrier 
GRX
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Vendor Y
IMS
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B
Open Mobile Alliance
OMA TestFests are Interoperability Testing Events
The objectives of the OMA TestFests are:
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To verify the interoperability, stability and quality of the participating
company implementations in a multi-vendor environment
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Provide feedback on implementation and operational issues to OMA
members developing the specifications, and
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Provide a peer-to-peer networking environment for participants to
improve their own implementations and their contributions to the OMA
specifications
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Interoperability Testing of PoC
OMA
 Example: OMA PoC “TestFest”
– First “TestFest” held 16-20 May in Helsinki
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Hosted by TeliaSonera
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Several client and server implementations
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Client to server, server to server and server to client
– …
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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.
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Conclusion

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
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