INTERNATIONAL TELECOMMUNICATION UNION
NGN-GSI – C 273 – E
TELECOMMUNICATION
STANDARDIZATION SECTOR
May 2009
English only
STUDY PERIOD 2009-2012
Original: English
12/13
Question(s):
NGN-GSI – CONTRIBUTION 273
Source:
ETRI
Title:
Proposal for a new work item on NGN-Web convergence for integrated multiservice networks
1. Introduction
From service evolutional point of view, most of NGN services will be based on web technologies
with user friendly and personalized solutions in multi-service network environment. Accordingly,
the requirement document (TD 16 (WP2/13)) for NGN already specified several requirements on
web-based application support and interworking service creation environments as follows.
Web-based application support
 The web-based application support enablers allow enhanced utilization of device
capabilities and network characteristics for web-based applications.
 Web-based application support capabilities provide users with a consistent web
environment which spans multiple network environments and multiple devices (PC, laptop,
PDA, cell phone, etc.).
Interworking with service creation environments
 The NGN open service environment is required to allow interworking between service
creation environments and network entities for creation and provisioning of applications
and services.
Contact:
Gyu Myoung Lee
KAIST
Korea (Republic of)
Tel:+82-42-866-6828
Fax:+82-42-866-6226
Email:gmlee@kaist.ac.kr
Contact:
Noel Crespi
Institut Telecom
France
Tel:+33 (0)1 60 76 46 23
Fax:+33 (0)1 60 76 45 78
Email: noel.crespi@it-sudparis.eu
Contact:
Jun Kyun Choi
KAIST
Korea (Republic of)
Tel:+82-42-866-6122
Fax:+82-42-866-6226
Email:jkchoi@ee.kaist.ac.kr
Contact:
Won Ryu
ETRI
Korea (Republic of)
Tel: +82-42-860-6290
Fax:
Email: wlyu@etri.re.kr
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In addition, at the last January Q12/13 meeting, we had decided to develop related recommendation
on integrated multi-service networks using web-based, middleware, and open environment as
shown in Figure 1. The tentative work plan was also produced as a result of discussion on future
work items.
Integrated multi-service Networks
IPTV Service Platform
Web-based/
middleware
Open
environment
NGN
Figure 1. Work scope of Q12/13 in TD 53 (GEN/13))
Table 1. Work plan for Q12/13 in the meeting report (TD 24 Rev.1 (WP2/13))
Q
No
12
Doc No
Document Title
Objectives and Scopes
Stage
Y.Framework
_Web_MSN
(tentative)
Framework and
Architecture for
Web Access
Service Platform
in multi-service
networks
(tentative)
The objectives are to specify service
requirements and capabilities, related
functions to support web access service in
Multi-services Networks. The basic principles
and concepts of the document are based on
Y.2235 ‘Converged web-browsing service
scenarios in NGN’.
The scope of the document includes:
 service requirements
 service and control capabilities
 service and control functions
 service and control interfaces
 integrated service platform issues
(including IMS, IPTV, and web
access service)
 information flows
1+2
Target
date
2011-01
( service
aspects+
functional
network
aspects)
Therefore, in this contribution, we propose architectural considerations for a new work item on
NGN-Web convergence for integrated multi-service networks.
2. Proposal
We would like to discuss the following proposed NGN-Web convergence architecture and also
request to adopt our proposal in the following as a living list item of Q.12/13 for encouraging
contributions and developing an initial draft recommendation on this work.
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-3NGN-GSI – C 273 – E
NGN-Web convergence for integrated multi-service networks
1. Overview
As we classify services into several categories (see the below classification), NGN will evolve into
integrated multi-service networks which support various composition services simultaneously. This
network requires networking environment with NGN/Web convergence.
Classification of service types
 Pure transport(delivery) services
 FTP, P2P
 Session-based (IMS)
 VoIP, session-based multimedia services (e.g., live channel)
 Web-based
 Traditional Internet Services
 VoD
 NGN(IMS) + Web  NGN/Web convergence
 Composition services (VoIP + IPTV + Web, etc)
 Integrated multi-service networks
Figure 2 shows NGN-Web convergence architectural model for interconnecting NGN and Web.
The proposed architecture mainly comprises web service control function (WSCF) and web media
function (WMF). The WSCF performs adaptation function between the NGN service stratum and
the Web. The WMF performs interworking between the NGN transport stratum and the Web.
NGN
Application support functions
& service support functions
User
Profile
Service platform
(service creation,
composition)
3rd party
applications
(API)
Service
control functions
Service stratum
Web Service
Control Function
Policy
enforcement
Directory
End-user
(Home
Network)
NACF
Web
RACF
Transport control functions
Transport functions
Transport stratum
Web Media Function
Web Media Gateway
NGN-Web Convergence
Figure 2.NGN-Web convergence architectural model
2. Web Service Control Function (WSCF)
Key capabilities for WSCF
 Service directory
 Hold a list of peer web server
ITU-T\COM-T\COMSI\C\273E.DOC
Web Server
Content
-4NGN-GSI – C 273 – E
 Service classification
 Identity service types for appropriate service control
 Signaling mapping and translation (adaptation function)
 Protocol conversion (e.g., between HTTP and SIP)
 Session manager
 session management with session control functions
 Broker
 Control of the transport boundary between NGN and open service environments
with web servers and multiple 3rd party providers, etc
 Authentication, security
 Billing & Charging
 Traffic measurement/monitoring
 Use of Web interfaces for searching and discovery
 Query to Directory/Repository
Interactions with other components for WSCF
 NGN service control functions
 PDF, CSCF, profile management
 Web media function
 Media delivery and conversion (gateway functions)
 Web components
 Interface with web server and web service description languages
 personalization and social networking using mesh-up, semantic, and ontology, etc
 Service platform
 Service creation, service composition
 3rd party applications
 Open API
3. Web Media Function (WMF)
Key capabilities for WMF
 Transcoding
 Conversion between different codecs
 Packet filtering
 Depending on IP addresses and port numbers
 QoS control
ITU-T\COM-T\COMSI\C\273E.DOC
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 Resource allocation and management
 Policing based on media flow parameters (e.g., packet size, bandwidth limits, etc)
 Media gateway
 Media delivery and conversion
 Transport interworking between NGN and Web
Interactions with other components for WMF
 NGN transport control functions
 Interaction with RACF and NACF
 Web server
 Interface with media transport protocol (e.g., RTSP, etc)
Reference
Frédérique Forestier Husson - Nabil Zakhama, “Web session controller: an opportunity for
IMS/Web convergence,” ICIN 2008.
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ITU-T\COM-T\COMSI\C\273E.DOC