Global Standards Collaboration (GSC) 14
DOCUMENT #:
GSC14-PLEN-054
FOR:
Presentation
SOURCE:
TTC
AGENDA ITEM:
6.11 NGN interoperability
CONTACT(S):
Hajime KOTO, Kaoru KENYOSHI
Proposed New HIS
on NGN interoperability
Hajime KOTO
The Telecommunication Technology Committee
(TTC)
as Prime PSO for NGN interoperability
Geneva, 13-16 July 2009
Fostering worldwide interoperability
Abstract
Resolution 76 “Studies related to conformance and
interoperability testing, assistance to developing
countries, and a possible future ITU Mark
programme” which was approved in WTSA08
(Johannesburg, 2008) instructs to take actions to
all ITU-T Study Groups to improve NGN
interoperability and encourages national and
regional test entities to assist ITU-T in
implementing this Resolution.
"NGN Interoperability“ has been approved as a
new HIS for GSC. TTC was assigned as Prime PSO
for this subject.
To support ITU-T activity, this paper describes
several solutions to achieve NGN interoperability
and propose collaborative direction in GSC.
Geneva, 13-16 July 2009
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2
How to achieve NGN interoperability?
There are several solutions to achieve
NGN interoperability. These solutions
are not exclusive but complementary.
Level 1
Specify detailed protocol specifications
Level 2
Specify test Specifications (e.g. PICS，
PICSIT, Implementation agreements etc )
Level 3
Interoperability testing and/or
conformance testing
Geneva, 13-16 July 2009
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The ways to NGN interoperability
Detailed
Protocol
Specifications
Recommendation
all WPs/SG11
Implementation
agreements
Compatibility with
products
Way to Interoperability Testing
Test Specifications
WP4/SG11
Certification by
the authority
Way to Conformance Testing
Level 1
Geneva, 13-16 July 2009
Level 2
Fostering worldwide interoperability
Level 3
4
The way to Conformance Testing
Scope of Conformance testing
Test subject is connected to the tester or reference machine
and examines the conformity with reference
recommendations.
Certifications may be given to the products passed by the
testing authority.
The documents which describe test specifications for the
conformance testing are specified in the test specification
language such as PICS, PICSIT etc.
More detailed protocol recommendations can make deeper
test specifications and deeper examination of the protocols.
General configuration for Conformance testing
Test Subject
(Product)
Tester
e.g. UNI/NNI
Geneva, 13-16 July 2009
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The way to Interoperability Testing
Scope of Interoperability testing
Multiple products of multiple vendors are connected and tested
for interoperability at the service level and/or transport level.
Interoperability testing will be conducted in the following steps,
Define service scenario (service use case).
Define configuration, products and interfaces to be tested.
Define implementation agreements for each test interface.
Examine interoperability tests according to the test scenario and
implementation agreement and analyze the test output.
The documents for Interoperability testing are composed of
service scenario (service use case) and implementation
agreements for each test interfaces.
The items which are supplemented in the implementation
agreement will be decreased if protocol recommendations are
more detailed and more exhaustive examination according to the
recommendation can be done.
Interoperability testing (e.g. IOT configuration for IMS based IPTV)
IPTV-AS
UE
IMS
Vendor A
IPTV-VS
QoS/Router
Geneva, 13-16 July 2009
Vendor B
Test interface
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Discussion on the Level1 solution
Develop additional or supplement documents to
specify more detailed protocol behavior to assure
interoperability.
TTC specifies JT-Q3401 NGN NNI signalling profile which
is based on the ITU-T Recommendation Q.3401. This
document includes national specifications in the annexes
and appendixes to assure interoperability among Japan
national carriers.
Pros.
There are many options to use SIP protocol. Guidance on
how to choose and set the options of SIP must be defined
for interoperability.
More detailed protocol recommendations can achieve the
full NGN interoperability.
Cons.
Many products in the market have already been
implemented. It is difficult to specify details after products
have been introduced into the market.
Obtaining consensus is time consuming.
Geneva, 13-16 July 2009
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Level1 e.g. NGN NNI/UNI signalling profile
Scope of NGN NNI/UNI signalling profile documents
These documents specify the service layer profile: the specifications
for the SIP/SDP interface at the UNI and NNI. Transport layer profiles
such as RTP are specified if media information is included in the
service layer signalling.
Logical
Interface
Interface in the scope of
the UNI document
Interface in the scope of
the NNI document
Service Control
Function
Service Control
Function
VoIP
Service
Provider
Transport
A
VoIP
Service
Provider
Transport
B
Function
Interface in the scope of
the UNI document
Function
IP telephony
IP telephony
SS7
MG
MG
SS7
PSTN
Geneva, 13-16 July 2009
Bearer (RTP/IP)
Signalling (SIP)
PSTN
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Level1 e.g. JT-Q3401 NGN NNI signalling profile
JT-Q3401 aims to assure interoperability amongst VoIP service providers in
Japan. This document is developed based on the ITU-T Recommendation
Q.3401 NGN NNI signalling profile and TTC adding the TTC specifications
(national standard) in the annexes and appendixes.
ITU-T Rec.
TTC Standard
Q.3401 (ITU-T)
JT-Q3401 (TTC)
SIP Signalling profile
Call Signalling flow
SIP Signalling profile
Call Signalling flow
Translation
Geneva, 13-16 July 2009
P1-43
+ TTC additional Specifications
Supplement technical documents
Annex a.
Clarifications of the JT-Q3401 text and option
items
Annex b.
Parameter setting of SIP message
Annex c.
Originating number indication
Annex d.
SDP non transparency in the Early dialogue
Annex e.
Null member talkie
Annex f.
Originating user identification
P44-127
Annex g.
Congestion control
Annex h.
Numbering SIP-ISUP interwork
Appendix i. Fall back connection
Appendix ii. TCP transport connection at the NGN-NGN
interface
Appendix iii. ISUP->SIP interwork for number portability
Appendix iv. Option list
Appendix v. SIP message and header information
Appendix vi.
Message examples
Fostering
worldwide interoperability
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Level1 e.g. JT-Q3402 NGN UNI signalling profile
JT-Q3402 aims to assure interoperability of the multimedia communications
between NGN and terminals such as SIP telephony, SIP IP-PBX and SIP
residential GW. This document is developed based on the ITUT Recommendation Q.3402 NGN UNI signalling profile and TTC adding the TTC
specifications (national standard) in the annexes and appendixes.
ITU-T Rec.
TTC Standard
Q.3402 (ITU-T)
JT-Q3402 (TTC)
SIP Signalling profile
Call Signalling flow
SIP Signalling profile
Call Signalling flow
Translation
Geneva, 13-16 July 2009
P1-58
+ TTC additional Specifications
Supplement technical documents
Annex a.
Clarifications of the JT-Q3402 text and option items
Annex b.
Originating number indication and relevant header
Annex c.
Terminal registration
Annex d.
SIP capability exchange
Annex e.
SIP and media handling
Annex f.
Congestion control
Annex g.
Band width control
Annex h.
Character length and parameter range of SIP
message
Annex i,.
Specifications for the behavior of voice terminal
Appendix i. Option items list
Appendix ii. Use of response code
Appendix iii. Mapping to the quality class with SDP description
Appendix iv. Security
Appendix v. SCF address acquisition
Appendix vi. SIP message and header information
Fostering
worldwide interoperability
Appendix vii.
Message examples
P59-161
10
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Discussion on the Level2 solution
Around 40 draft test specification
recommendations are being studied under
WP4/11. These documents should be promoted
by SG11 to achieve better conformance testing.
The following should be taken into consideration:
Priority of study and area of study should
respect the requirements from developing
countries.
Each fora and regional SDO should reflect
their output by submitting their specifications
to ITU-T.
Geneva, 13-16 July 2009
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Discussion on the Level3 solution
Two ideas on how to set up of test facilities:
construct new test facilities of ITU-T and/or
globally connect regional SDO test facilities (ie., CJK,
ETSI TISPAN).
Fora, SDOs and regional/national organizations
have already conducted various test events (E.g.
TISPAN Plug test, MSF/GMI event, HATS in Japan
etc). Harmonization and collaboration between
them should be considered.
Pros.
This is the most comprehensive method to assure the
product interoperability.
Cons.
There were many questions and comments raised such
as who provides the testing facilities, where is the test
location and how long, how frequent and how deep?
Associated costs to test are high.
Geneva, 13-16 July 2009
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Proposed Strategic Collaborative
Direction in GSC (Resolutions)
1.
to exchange and share the information among PSOs
which have already good experience in assuring
NGN interoperability.
2.
to participate positively in the ITU-T SG11 miniworkshop which is scheduled during the NGN-GSI
event in September, to assist ITU-T to promote NGN
interoperability and initiate the required actions.
3.
to encourage the PSOs to submit contribution to the
relevant ITU-T study groups including SG11 to
promote the discussion on NGN interoperability in
ITU-T.
Geneva, 13-16 July 2009
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Proposed Strategic Collaborative
Direction in GSC (Resolutions)
4.
to encourage the PSOs and ITU-T to study and
discuss their future roles in NGN conformance
testing and NGN interoperability testing .
5.
to encourage the PSOs and the related
Fora/Consortia to discuss the establishment of the
framework for NGN conformance testing and NGN
interoperability testing to be prepared in order that
the conformance to ITU-T NGN Recommendation
can be tested.
Geneva, 13-16 July 2009
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Supplementary Slides
Geneva, 13-16 July 2009
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Resolution 76 approved in
WTSA08
Studies related to conformance and
interoperability testing, assistance to
developing countries[1], and a possible
future ITU Mark programme
(Johannesburg, 2008)
The World Telecommunication Standardization Assembly
(Johannesburg, 2008),
[1] These include the least developed countries, small island
developing states and countries with economies in transition.
Geneva, 13-16 July 2009
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Resolution 76 approved in
WTSA08
recognizing
a)
that interoperability of international telecommunication
networks was the main reason to create ITU in the year
1865 (International Telegraph Union), and that this
remains one of the main goals in the ITU strategic plan;
b) that conformity assessment is the accepted way of
demonstrating that a product adheres to an international
standard and is increasingly important in the context of
World Trade Organization members' international
standardization commitments under the Agreement on
Technical Barriers to Trade;
c) that Recommendations ITU-T X.290 to X.296 specify a
general methodology for conformance testing of
equipment to Recommendations of the ITU
Telecommunication Standardization Sector (ITU-T);
d) that conformance testing would increase the chance of
interoperability of equipment conforming to ITU
standards;
e) that very few of the current ITU-T Recommendations
identify interoperability or conformance testing
requirements;
Items from f) to J) are omitted in this slide.
Geneva, 13-16 July 2009
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Resolution 76 approved in
WTSA08
considering
a) that there is an increasing number of complaints that
equipment is often not fully interoperable with other
equipment;
b) that some countries, especially the developing countries,
have not yet acquired the capacity to test equipment and
provide assurance to consumers in their countries;
c) that increased confidence in the conformance of information
and communication technologies (ICT) equipment with ITUT Recommendations would increase the chances of end-toend interoperability of equipment from different
manufacturers, and would assist developing countries in the
choice of solutions,
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Resolution 76 approved in
WTSA08
resolves
1 that ITU-T study groups develop the necessary
conformance testing Recommendations for
telecommunication equipment as soon as possible;
2 that ITU-T Recommendations to address interoperability
testing shall be progressed as quickly as possible;
3 that ITU-T, in collaboration with the other Sectors as
appropriate, shall develop a programme to:
i) assist developing countries in identifying human and
institutional capacity-building and training opportunities
in conformity and interoperability testing;
ii) assist developing countries in establishing regional or
subregional conformity and interoperability centres
suitable to perform conformity and interoperability
testing as appropriate;
4 that conformance and interoperability testing requirements
shall provide for verification of the parameters defined in
the current and future ITU-T Recommendations for
telecommunication/ICT equipment and services, and for
interoperability testing to ensure full compatibility,
Geneva, 13-16 July 2009
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Resolution 76 approved in
WTSA08
Instructs the study groups
1.
2.
To identify as soon as possible existing and future ITU-T
Recommendations that would be candidates for
interoperability, taking into account the needs of the
membership (e.g. interoperability of NGN equipment,
terminals, audio/video codecs, access and transport
network), that are capable of providing end-to-end
interoperable services on a global scale, adding to their
content, if necessary, specific requirements within their
scope
To prepare those ITU-T Recommendations, identified in
instructs the study groups 1 above, with a view to
conducting conformity and interoperability tests as
appropriate,
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Resolution 76 approved in
WTSA08
invites Member States and Sector Members
1.
to contribute to the implementation of this
resolution;
2. to encourage national and regional testing
entities to assist ITU-T in implementing this
resolution.
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