(Continuation of Question 2/11) Motivation
The Next Generation Networks (NGN) expression is commonly used to refer to
the emerging public network infrastructures based on packet switching and
routing technologies, on increasingly distributed control functional
architectures, and on the use of evolving and new signalling protocols to
control in particular in user sessions, identification, authentication, resource
allocations and QoS, the traffic (policing, enforcement), services and
applications, between various entities (e.g. media gateways, call/session
servers, resource control, service control, services and application platforms)
involved in NGN architectures. An objective of the NGN is to support in a secure
fashion, fixed and nomadic users with a wide range of services1, from legacy
telephony and Intelligent Services to new generation services, encompassing
audio, data, video broadcast and conversational services, streaming services,
interactive games, including multicast.
With the advances in IP based terminals and web service technologies,
possibilities for the provision of new value-added services are broadened. Also,
web applications and web service providers are successful and are growing in the
market at a considerable rate. For these reasons, the ITU-T should consider how
to exploit third-party and in-house web services within NGN applications and how
to converge NGN and web based services.
As the ITU-T has led and continues to lead the development of the PSTN/ISDN,
packet-based public networks and services signalling requirements, it is
believed that ITU-T is the most suitable body to develop the application
signalling requirements for emerging NGN architectures.
Recommendations in force for which the Question is responsible: Q.12x8
series.
Question
Study items to be considered include, but are not limited to:
- What are the application signalling and protocol requirements for the
control of services in NGN architectures, at interfaces identified by Q.1/11 as
requiring standardization? Specifically:
- What are, among existing appropriate standards, the candidate service protocol
solutions for NGN architectures?
- What signalling protocols and profiles (if any) need to be defined for the use
of such existing service protocols particularly between networks (end-to-end)?
- What additional service protocol elements or new service protocols (if any)
need to be developed?
- What enhancements to existing Recommendations are required to provide energy
savings directly or indirectly in information and communication technologies or
in other industries? What enhancements to developing or new Recommendations are
required to provide such energy savings?
- What associated mechanisms are required to assure security of application
signalling and control?
- What signalling architecture and entities are required to support services
and/or applications of public interest such as emergency call handling, number
portability, etc.?
- What signalling architecture is required to influence the application layer
signalling, and the interworking between the application layer signalling and
the network layer signalling in distributed networks?
Tasks
Tasks include, but are not limited to:
- Define the requirements for application (service control) protocols between
relevant NGN entities for the interfaces identified in the NGN generic control
signalling architecture.
- Model session (or call) processing for the development of application service
signalling requirements, as needed to capture the interaction between services
and application (including content delivery) platforms or servers.
- In order to provide new value added converged services in NGN, incorporate web
services based functions and interfaces between them such as service
registration, discovery, service composition, and service orchestration in
application control in NGN.
NOTE -- Web based application/service support functions are being defined in NGN
release 2 architecture (Y.2232, Y.openenv).
- Provide a specification of the application (services control) protocol for
each interface identified in Q1/11. These protocol definitions will be in the
form of references when existing specifications are applied.
- Determine the service signalling requirements to support new value added
services intended to emulate or replace existing intelligent services.
- Determine the service signalling requirements to support new value added
services taking into consideration the following:
- NGN service requirements (Recommendation Y.NGN-SRQ developed by SG13);
- multimedia service requirements developed by the ITU-T;
- network control functional architecture developed by the ITU-T;
- security requirements consistent with the security framework developed by the
ITU-T taking into consideration as appropriate, the service creation tools and
solutions developed by other expert bodies (e.g. OASIS, W3C, etc.);
- technology specific requirements resulting from using different service
creation tools, e.g. APIs, Web Services, etc.;
- the concept of nomadic users.
- Determine signalling requirements and protocol elements to resolve
interactions between services.
- Develop specifications of interfaces to adjacent layers (session) jointly with
relevant Questions/groups.
- Determine signalling requirements and protocols for application layer
signalling and to support interworking between the application layer signalling
and the network layer signalling in distributed networks.
Relationships
Recommendations:
Questions:
Questions responsible for:
- signalling and control architecture (1/11).
- session control and signalling (3/11).
- bearer control and signalling (4/11).
- resource control and signalling (5/11).
- network attachment control and signalling (7/11).
Study Groups:
ITU-T Study Group(s) responsible for:
- voice and video IP application over cable television networks.
- TMN aspects.
- principles, requirements, frameworks and architectures for an overall
heterogeneous network environment.
- multimedia architecture aspects.
- IMT2000 and beyond.
Standardization bodies:
Organizations such as: 3GPP (via ETSI), 3GPP2 (via TIA), ASTAP (Asia-Pacific
Telecommunity Standardization Program), ATIS (Alliance for Telecommunications
Industry Solutions), ATM Forum, DSL Forum, ETSI, IETF, MSF, W3C.
1The word “service” in this context is not meant necessarily to represent an ITU-T-defined Service. |