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FORUM ON NEXT GENERATION STANDARDIZATION (Colombo, Sri Lanka, 7-10 April 2009). Need of Interoperability “within” an NGN – An approach. Rajeshwar Dayal, Director Dept. of Telecommunications, India. What interoperability means for :.

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Need of Interoperability “within” an NGN – An approach

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FORUM ON NEXT GENERATION STANDARDIZATION (Colombo, Sri Lanka, 7-10 April 2009)

Need of Interoperability “within” an NGN – An approach

Rajeshwar Dayal,

Director

Dept. of Telecommunications, India


What interoperability means for :

  • ITU – The ability of two or more systems or applications to exchange and mutually use the information that has been exchanged ( Y.101)

  • ETSI – Capability to provide successful communication between end users across a mixed environment of different domains, networks, facilities, equipments etc. ( TR 101 287)

    - where one component, from one manufacturer, can be replaced with another, and the basic operation of system remains unaffected. (TR 102 136 )

  • IETF –The ability of software and hardware on multiple machine from multiple vendors to communicate meaningfully. ( RFC 1983)


Context of interoperability

  • No common definition or context

  • Multiple definitions by same SDO

    • Network

    • System

    • Application

    • Component

    • Terminal/ CPE

    • Software & Hardware


Interoperability –Between networks and within a network

Operator B

Operator A

Network B

Network A

SIP Application

Server

WEB

Portal

VOIP

Gateway

Router

Within a network there are

various network elements,

systems, equipments,

Components……


Network Expansion Case 1– Same vendor

SIP Application

Server

WEB

Portal

Expansion equipments

from Vendor A

Router

VOIP

Gateway

Interoperability

is ensured

Network from Vendor A

Smooth expansion


Network ExpansionCase 2 –Different vendor

SIP Application

Server

Expansion equipments

from

Vendor B & vendor C

WEB

Portal

Router

VOIP

Gateway

Interoperability

Missing

Network from Vendor A

Network Expansion ???


Need of interoperability ‘within’ NGN

  • More modularity in the network

    • Comfort of plug-and-play

    • More competition

  • Faster and smooth deployment

    • Eliminate locking up with vendor

  • Need of time

    • Scenario of convergence & merger

  • ITU-T

    • Objective of NGN (Y.2001)-Fair competition

    • Resolution 2- Mandate & responsibility of SG13


Current approach to achieve Interoperability

  • Testing against Conformance and Interoperability Test Suits

  • Interop Events ..

    • Plugtests

    • Plugfest

    • Bake off


Why Interop. is not a natural outcome of conformance to standard ?

  • Misinterpretations : Ambiguity, Not complete ( Normal Expected behavior but what if unexpected happens)

  • Multiple options for implementation

  • Difficult to interpret

  • Flexibility - for consensus or … interests

  • Not comprehensive - cross references


What is specified by ITU for NGN

ANI

NNI

UNI

  • Functional architecture

    ( Y.2012)

For interworking and

interoperability at network boundary level.


What is specified for ‘within’ NGN ?

“Within” NGN

  • Y.2012

  • Functional

  • Architecture

  • Q.3030

  • Signalling

  • Architecture for

  • service control plane


What is required for interoperability ‘within’ an NGN?

  • Standards providing :

    • Architecture identifying interoperable Functional / Physical Entities and their open interfaces.

    • Requirements, spelt out unambiguously & comprehensively, for such open interfaces covering aspects such as its applicable stacks /layers, protocols & their profiles for interoperability, technology specific interfaces / protocols, etc.


From existing architecture to An architecture with open interfaces

SIP Application

Server

WEB

Portal

Router

VOIP

Gateway

Interoperability

Missing

Open interfaces

Multi-vendor equipments


Conclusion (1/2)

Steps to bring interoperability as natural outcome of conformance to standards-

  • Standards / Recommendations need to be categorized e.g. for ‘Protocol’, ‘Network’, ‘Equipment’, ‘Services’.

  • A template & checklist need to defined/ developed for each, to address interoperability.

    e.g. physical equipment aspect ( and not only functional aspects) in standards related to equipments.


Conclusion (2/2)

  • Mechanism need to be worked out for :

    • Testing of Standards - before final approval.

      - may be those required for developing

      interoperable equipments or services

      - testing infrastructure e.g. ITU-ZNIIS ITTC

    • Feedback - from developers, implementers, users, testing / certifying agencies, etc.

      e.g.Resolution-44, Forums of Interop Events

    • Synergy of related activities at ITU & SDOs. e.g. JCA-CIT, SG-17,SG-11, ITTC, Res. 44


Thank You


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