Download Mobility Issues

Mobility management issues
in next generation networks
Frédéric DELMOND
France Telecom R&D
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ITU-T SG13 futures session – July 25, 2003 - D1
Global requirements to support nomadic
users
s
An extensive range of access networks and terminals
– xDSL, WLAN, 3G mobile, etc. in addition to narrow-band access
– PCs, laptops, PDA, handsets, etc.
 Nomadism should be supported across
heterogeneous
environments :
Qconsistent service presentation and execution, whatever the access
network point
Q enhanced services, aware of the current user environment (e.g. location, bit
rate)
s
Global users in the network & in the services
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D2
Minimum requirements to support nomadic users
s
User identification + authentication
QIdentify the user separately from the access
s
User access control
Q Allowed / banned access
s
User location management
QRetrieve where the user is located, over which access
he’s connected
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D3
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
France Telecom R&D
WLAN
access
network
ITU-T SG13 futures session – July 25, 2003 - D4
Technical challenges for User Identification, Authentication and Authorization in heterogeneous networks
s
Q Objective: to design generic, re-usable network functions
Technical issues:
Q1. How to provide a simple & secure interface to users ?
– How to provide 'Single Sign On' to users across various access means
(fixed and mobile) ? Which interactions to be defined with services &
applications ?
– Which authentication schemes ?
Q2. How to enable the operator to be a trusted 3d party ?
– when the operator has performed identification & authentication
Q3. Access control:
– how to access the user profile during access control in the network,
when the user requests session setup ?
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D5
Technical challenges for User data in heterogeneous
networks
QData related to user environment (access + terminal)
QInformation needed for VHE and enhanced services
s
Technical issues:
Q1. Extract useful information from protocols in the signalling path
– e.g. access identification, access type, terminal type, etc.
 define the minimum information needed in these protocols and
propose protocols evolutions when necessary
Q 2. Provide a view of active access sessions in real-time
 define interfaces to allow services and application to retrieve data of
user access sessions
– e.g. user location, max. bit rate available
 be able to notify user IP connectivity = “network presence”
– easier presence management at application level
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D6
Technical challenges for User profile in
heterogeneous networks
Q User profile is composed of
– “dynamic data”
– values change as users move
– e.g. user location, bitrate available, user presence, etc.
– “static data”
s
– values do not change as users move
– e.g. service subscription, user preferences, etc
Technical issues:
QHow to retrieve any user data in a simple manner ?
 Define a minimum user profile, which can be known by
the network operator, applications and services ?
 A consistent and global approach for user profile is
needed
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D7
Synergy with mobile networks ?
s
How to handle nomadism across fixed and mobile access ?
Q Example 1 :
– develop Mobility Management (MM) functions for fixed access …
… and mobile networks 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,
fixed or mobile
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D8
Conclusions
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
– with the terminals, with the application layer, with the transfer plane
France Telecom R&D
ITU-T SG13 futures session – July 25, 2003 - D9