Transcript Titre du document Date

Nomadic users :
mobility management
in next generation networks
ITU-T Workshop on NGN – July 9-10, 2003
Frédéric DELMOND
France Télécom R&D
Present document contains informations proprietary to France Telecom. Accepting this document means for
its recipient he or she recognizes the confidential nature of its content and his or her engagement not to
reproduce it, not to transmit it to a third party, not to reveal its content and not to use it for commercial
purposes without previous FTR&D written consent.
confidential
ITU-T Workshop on NGN – July 9-10, 2003 - D1
Contents
s
Introduction
s
Requirements to support nomadic users in NGN
s
Where the network can add value
s
Technical challenges for mobility management in NGN
s
Synergy with mobile networks
s
Conclusions
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D2
Introduction
Video on
demand
Service
Providers
Multimédia
Calls (VoIP)
Contents on
the Web
Q Nomadic: No active service
ISP
PSTN
IP
Backbone
xDSL
Which users ?
(dial-up),
session while on the move
Q Mobile: service sessions can
be kept active while moving
(hand-overs)
etc.
2G/3G
Mobile networks
What do they expect ?
Q consistent service
WLAN
presentation and execution,
whatever the access network
point
Home
Public environment
Q enhanced services, aware of
Hotspots
the current user environment
in public places
(e.g. location, bit rate)
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D3
Global requirements to support nomadic
users
s
An extensive range of access networks and terminals
– users are already proposed xDSL, WLAN, 3G mobile, etc. in
addition to narrow-band access
– users already have PCs, laptops, PDA, handsets, etc.
 Nomadism should be supported across
heterogeneous
environments
s
Global users in the network & in the services
– enable a single user to be recognised across various access
types
– enable a consistent service experience when users move
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D4
Minimum requirements to support nomadic users
Who ?  user identification + authentication
 Identify the user separatly from the access
Where ?  user location management
 Retrieve where the user is located, over which
access he’s connected
2G/3G mobile
access
WLAN
Hotspots
in public places
PSTN
(dial-up)
xDSL
France Telecom R&D
Home
Hand-overs
Video on
demand
ISP
Multimédia
Calls (VoIP)
Contents on
the Web
User ID
& Authentic.
Access
Control
Services
User
location
confidential
User
of this document is subject to France Telecom authorization
OK ? User access Diffusion
control
ITU-T Workshop on NGN – July 9-10, 2003 - D5
Subscription
 Allowed / banned access
Additional requirements to support nomadic users
s
Enhanced services for nomadic users
Q Virtual Home Environment concept :
– users should experience consistent service execution
– services should be adapted to the current user situation in real-time
Q VHE enablers:
– know more about the user environment
xDSL
– Access network + Terminal capabilities
– know more about the user preferences
– General user preferences
– User configuration for the access service
– Presence and availability management
WLAN
access
network
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D6
Where can the network add value ?
s
Where several services and applications require similar
components
Q Mutualisation of functions at the control layer
Q avoid redundant developments within applications and services
 Design generic functions at the network control layer
they should be re-usable for any type of services:
– Web-based, VoIP, streaming services, etc.
s
Examples are:
Q User Identification and authentication
Q User access control
France Telecom R&D
confidential
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D7
Where can the network add value ?
s
Where network operators have a distinctive advantage
QThey have a unique and detailed knowledge of their access network
– Network topology and access location
– Access capabilities in real-time
 Extract information available in the protocols within the
control or transfer plane
s
Examples are :
Q User location can be guaranteed by network operators
– geographic or network-based information
Q Information on user environment
– access networks and user subscription constraints
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D8
Technical challenges for mobility
management in NGN
s
User Identification, Authentication and Authorization are
closely related
QBasic mandatory functions in mobility management
s
Technical issues:
QHow to provide a simple & secure interface to users ?
– SSO, enhanced authentication schemes
QHow to enable the operator to be a trusted 3d party ?
– interactions to be defined with services & applications
QAccess control:
– how does this function depend on the user ?
France Telecom R&D
confidential
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D9
Technical challenges for mobility
management in NGN
s
How to handle data related to user location and user
environment ?
QInformation needed for VHE and enhanced services
Q Ensure that protocols used in the signaling path conveys enough
information
– e.g. access identification, access type, terminal type, etc.
Q Provide a view of active access sessions in real-time
 allow services and application to retrieve user access data
– e.g. user location, max. bit rate available
 notify of user IP connectivity = “network presence”
– easier presence management at application level
confidential
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D10
Technical challenges for mobility
management in NGN
s
A consistent and global approach for user profile is
needed
Q Services, applications and Mobility management functions
rely on user data
QUser profile is composed of
– “dynamic data”
– values change as users move
– e.g. user location, bitrate available, user presence, etc.
– “static data”
– values does not change as users move
– e.g. service subscription, user preferences, etc.
QHow to retrieve any user data in a simple manner ?
France Telecom R&D
confidential
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D11
Synergy with mobile networks ?
s
How to handle nomadism across fixed and mobile access ?
Q Example 1 :
– develop MM functions for fixed access …
… and mobile network are used as a simple access means.
 Users are handled by these MM functions whatever the access
Q Example 2 :
– develop MM functions for fixed access …
… users rely on mobile network MM when using a mobile access
 Develop specific coordination between mobile and fixed network
Q In any case, the realization of VHE requires that
– consistent interfaces with users and with services whatever the access,
confidential
fixed or mobile
France Telecom R&D
Diffusion of this document is subject to France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D12
Conclusions
s
Mobility management is a key feature in next generation
networks
Q A variety of access types & terminals are proposed to users in
NGNs.
Q Support of nomadic users
Q Enhanced services, adaptable to the current user environment
(VHE)
s
Standardisation activities for mobility management in NGN
Q ensure a “global user” approach, independent of a specific access
technology
Qdefine a reference architecture and network functions required to
support nomadic users
Qdefine required interfaces for these functions in the control layer
confidential
– with the terminals, with the application layer, with
the
transfer
plane
France Telecom R&D
Diffusion
of this document
is subject to
France Telecom authorization
ITU-T Workshop on NGN – July 9-10, 2003 - D13