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Seminar on ITU-T hot topics for
Standardization
(Mar del Plata, Argentina, 2 September 2009)
Model networks as an instrument
for global interoperability
Denis Andreev
Rapporteur of Q.10/11 ITU-T
Director of Technopark
Central Research Telecommunication Institute
(ZNIIS)
Mar del Plata, Argentina, 2 September 2009
International
Telecommunication
Union
Reasons of necessity of NGN testing
Growth of the manufactured equipment
nomenclature and software which realize
NGN functionality and appear a lot of unify
equipment (router with gateway functionality
and etc.)
Appear of new set of services which is
realized without changes of network and
independent of technologies
Absence of guarantee quality of network
performance compare with exist TDM
network
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Purpose of NGN testing
NGN technologies harmonization,
global principle on implementation
and operation of NGN networks and
usages
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Exist situation ITU-T on area testing
standardization
Present time
Conformance testing which are included
protocols and interfaces testing (TTCN 1
(X.292-1995), TTCN 2 (X.292-1998), TTCN 3 (Z.140-2003)
TSS&TP, PICS/PIXIT proformas for different protocols
testing)
Future
NGN based on the functional entity
which interwork with some protocols
Interoperability testing (Q.3901)
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Purposes ITU-T on testing
standardization area
WTSA-08 Resolution 76
“Global Interoperability”
Interoperability of technical means
(TM) which realize the basic NGN
functionality (Y.2012, Y.2010)
NGN Services Interoperability
QoS Interoperability
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The approach of NGN testing
Functional Interop. testing – verification
the functionality on TM (EUT) and systemnetwork solutions (NUT) different vendors
for compatibility in accordance with basic
ITU-T Recs.
Service testing – testing the services on
scenarios “end-to-end” include call flow
testing and testing with exist provider’s
operation systems (Billing, OSS/BSS and
etc.)
QoS testing – testing the QoS parameters
and RACF functionality
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ITU-T Rec. Q.3900 as a global
approach of testing
Purpose – determination Model network
as a basic solution for NGN testing
Model network – a network which simulates the
capabilities similar to those available in present
telecommunication networks, has a similar architecture
and
functionality
and
uses
the
same
telecommunication equipment
Contents of Q.3900
Classification of NGN TM regarding
functionality (Y.2012)
 Determination of testing procedures
 Requirements to Model network

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the
NGN
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Architecture of Model Network
(Rec.Q.3900)
PSTN/ISDN
PSN
AS
ACE
BS
Application stratum
MS
MeS
Management system
Management
stratum
PS
MGC
IMS
Session&Service Control stratum
IP ATM SDH
Legacy TE
NGN-IAD
SG
Access stratum
PLMN
3G/GSM
TNE
MGW
Transport stratum
Model Network
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Internet
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Classification of NGN TM (Rec. Q.3900)
Call Session Control System
Media Gateway Controller (MGC)
S3, S7, S9, S10, S12
T10, T11, T12, T13
Proxy Server SIP (PS)
S2, S3, S7, S11, S12
T10, T11, T12, T13
IP Multimedia Subsystem (IMS)
S1, S3, S6, S7, S8, S10, S12, S13
T10, T11, T12, T13, T14, T15, T16, T17
Voice and signaling transmit system
Media Gateway (GW)
Signaling Gateway (SG)
Transport
Network
Environment
(TNE)
Application servers
Application Server (AS)
Media server (MS)
Messaging Server (MeS)
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T7, T8
T8, T9
T5, T6, T8
S4, S5, S6, S14, S15
S4, S5, S6, S14, S15
S4, S5, S6, S14, S15
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Joint ZNIIS-ITU-D Project (ITTC)
Purpose – to create an International
Telecommunication Testing Centre (ITTC)
for testing new technologies, include NGN
and
train
telecom
specialists
from
developing countries
First results
Testing the NGN system networks
solutions
on
interoperability
in
accordance with ITU-T Rec. Q.3901:
 IMS and Softswitch
 BBA
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ITTC tasks
 To
search and removal problems and
difficulties in TM before realizing it on
the “live” network
 To
solve the interoperability TM different
vendors
 To
save experience for implementation it
on the activity of different telecom
players
 To
verify NGN services and preparation
the recommendations for implementing
it on the exist networks
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ITTC practical Model network
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Global problems on functional Interoperability
(ITTC ITU-ZNIIS joint project - CIS08-02)

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Tariffication data lost in emergency situation in case of
geographic redundancy
Absence of statistical data about IP characteristics
sessions
Absence the QoS parameters and total layer for session
and subscriber in tariffication data
IMS does not interop
Absence of “Ring-back tone”
Absence the possibility of T.38 realizing
Problems with modem connection
Different content of head field in SIP for IMS solutions
Different syntax of parameters which are used in SIP
IMS
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Standardization services - exist situation
ITU-T (common services requirements – determination services
and delivery content)
Y.2271 – common requirements and contents of services NGN
rel.1
Y.2012, Y.2201 – requirements to voice services and instant
messages
OMA-PoC – requirements to Push to Talk service (Push over
cellular)
F.703, F.724 (VideoTel), F.733 (MMconf) – requirements to
multimedia services
ETSI (requirements to additional data which is included in
signaling protocols parameters for implementing each of services)
The set of supplementary services – TIP/TIR, OIP/OIR, HOLD,
MWI и т.д.
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The global problems
• The service is realized under functionality and
technical capability for each of vendor’s equipment
(service depend on equipment)
• The similar services are realized on the different
telecom networks by different technologies and
different approaches
• Supplementary and universal services (NGN
services) under interwork process between
different service providers does not realize
(implement service scenario “end-to-end” could be
realize just only one network)
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The basic reasons of problems
Different
equipment
for realizing
NGN services
Different
signaling
protocols are
used for
implementing
services
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Different
logic of
services
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The global standardization approach of NGN
services
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The scope of NGN service requirements template
(ITU-T Rec.NGN_service)
• Service definition, common service characteristics and service providing
principle, in point of view operator and customer include: short
description of service with imagine form of service (message, voice
transmission and etc.), principle of location service in telecom networks
and rules of customer’s access to the service, principle of service control
procedure: activation, configure, unsubscribing, statistic and tariffication
data
• Network requirements for providing service, include requirements to:
numbering, identification, subscriber’s profile control, type of codec,
parameters of QoS, security, and interworking with exist operators
systems (accouting, law full intercept and etc.)
• Architecture requirements and requirements to functional elements,
which are used for service realizing
• Equipment’s functional requirements
• Service scenario requirements
• Signaling protocols requirements for realizing service (call flow) International
Telecommunication
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The ETSI approach for service testing (TISPAN 06)


Detail
verification
syntaxes
of
signaling
protocols in the different equipment trough
sending
the
messages
with
determined
parameters
Service test specifications based on the TTCN-3
Example of ETSI service test
specification
“Terminating Identification
Presentation (TIR)”
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The new approach of service testing (WP4/11
Q.10/11 Service test specification)



Detail verification syntaxes of signaling protocols in the
different equipment trough sending the messages with
determined parameters with TTCN-3 (like in ETSI)
Functional testing services (testing the functionality of
equipment which is used for implementing services)
include logic testing ("end-to-end")
Verification services with existing operators systems:

Accounting system

Statistic system

Operation and management system
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The real plans of service testing in ITTC
8-80X-XXX-XXXX
PLMN
VoIP network
PSTN
Office
Home
(499) XXX-XXXX
(495) XXX-XXXX
(9XX) XXX-XXXX
12:15
(495) XXX-XXXX
UAN
09:00 – 18:00
08:00 – 09:00
18:00 – 19:00
Incoming call to UAN
customer
07:00 – 08:00
19:00 – 22:00
8-80X-XXX-XXXX
Visit network
Home network
Outgoing call from
UPT subscriber
(495) XXX-XXXX
(812) XXX-XXXX
(495) XXX-XXXX
Инициация входящего
CLIP
вызов к абоненту с UPT
Number of UPT subscriber
80Х-ХХХ-ХХХХ
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UPT
UPT
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History of testing research area in
ITU-T
WTSA-04 (Brasilia, Oct. 2004)
Creation of Q.8/11 “NGN test specification”
WTSA-08 (RSA, Dec.08)
Creation WP4/11 “Test specifications”
Continuation of Q.8/11 “Protocol Test Specifications
for NGN”
Creation of new questions
Q.9/11 “Monitoring parameters for NGN protocols”
Q.10/11 “Service test specification for NGN”
Q.11/11 “QoS tests specification for NGN”
Q.12/11 “NID and USN test specification”
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The achievement results SG11 under
responsibility of testing
Q.3900 Methods of testing and model network architecture
for NGN technical means testing as applied to public
telecommunication networks (approved 09/06)
Q.3901 Integral testing. Tests and services' distribution for
NGN technical means testing in the model and operator
networks (approved 01/08)
Q.3902 Parameters to be monitored in the process of
operation when introducing NGN in PSTN (approved 01/08)
Q.3903 Formalized presentation of testing results
(approved 09/08)
Handbook on NGN technical means testing as applied to
NGN technologies to be introduced on PSTN networks (on
development)
International
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Plans of WP4/11 ITU-T

IMS TM and NUT testing (Draft Rec.Q.3904)

IMS/PES benchmarking

BBA testing (fixed, WiFi, WiMax) (Draft Rec.Q.3906.1,
Rec.Q.3906.2 and Rec.Q.3906.3)

NIT between protocols NGN and TDM

“end-to-end”
Rec.Q.3915)

NGN
supplementary
OIP/OIR, HOLD etc)

IPTV testing

NACF and RACF testing

QoS testing
NGN
testing
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services
(TS1,
TS2)
testing
(Draft
(TIP/TIR,
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KNOWLEDGE
DATABASE
с
ZNIIS
Compliant to ITU-T
Recommendation Q.3903
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Virtual repository
Possibility for creation of dedicated area with
restricted access to Knowledge Database for
storing of different information of Administrations
and operators (methodologies, testing reports,
network schemes, normative documents and etc.)
Existence of virtual constructor of testing
methodic, for development of these documents in
the automatic mode using powerful set of libraries
of tests of functionalities, conformance and
interworking of different technical means, system
and network solutions, protocols and services of
NGN
Collection and distribution of testing results in the
worldwide mode
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Virtual labs
On the preparation meeting for Council-09 on the
questions of WTSA-08 Resolution #76 implementation,
placed in Geneva (Switzerland) July 20-21 2009, Russian
Administration delegation has contributed initiative on
creation of international virtual labs based on Knowledge
Database of ITTC project for carrying out of remote
trainings of specialists from developing countries on the
questions of building, development, standardization and
testing of NGN
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Virtual Lab facilities
Virtual labs, providing the following functions:
−
access of specialists from developing countries to the
equipment management systems, installed on the ITTC
Model Network through Knowledge Database website
−
Performing of required network configurations
−
Remote testing with further development of reports in
the automatic mode
−
Existence of GUI for Knowledge Database
−
Remote trainings for specialists from developing
countries on theoretical and practical skills of work with
NGN equipment (implementation of WTSA-08 Res.76)
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Consequence of Global interoperability
Global
approach
of
network
interworking
Appear transparent mechanisms for
roaming and nomadism in the fixed
and wireless networks
Absence the association of services
with physical network infrastructure
Subscriber freedom and possibility to
satisfy a lot of information miracles
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Resume for Model networks usages
• To find and solve disagreements in the
equipment realization before introduction into
the live network
• Solving compatibility issues and
interchangeability of equipment from different
vendors
• Accumulation of experience in part of solving
compatibility problems on current operator
netwroks
• Maintenance of new services and development
procedures of its introduction into the live
networks
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Resume on implementing ITTC activities
Reducing of digital gap by sharing experience of
introduction and maintenance of new technologies,
implemented on the operators networks from developed
countries, on the worldwide telecommunication market
Using ITTC as the effective mean of gathering experience
and consolidation of high-level specialists and experts in
the field of introductions, testing, standardization and
maintenance of new telecommunication technologies
Performance of regional initiatives and private initiative
projects for network operators in part of development
qualifying standards, which determine entire approaches
and rules in part of introduction of new technologies on
the operator networks
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Thank you for attention
Denis Andreev
Rapporteur of Q.10 WP4/11
Director of Technopark ZNIIS
Central Science Research Telecommunication Institute
(ZNIIS), Moscow
Tel: +7-495-368-8745
Mob: +7-495-647-9603
Fax: +7-495-368-9105
Email: [email protected]
cc: [email protected]
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