ITU-T / ATIS Workshop
“Next Generation Technology and Standardization”
Las Vegas, 19-20 March 2006
IMS and the Fixed Network
Jane D Humphrey
ITU-T
IMS from the Mobile perspective
o 3GPP commenced work ’99 to define an all IP
core network
o From this the IMS evolved, providing:
• Core network elements for provision of
multimedia services
• Session Control capability (IETF SIP)utilising
multimedia bearers and the Packet Switch
Domain
• Platform for 3G global roaming
• Convergence of, and access to, voice, video,
messaging, data and web based technologies.
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
2
IMS = common functions + service enablers
Internet based
session control
Service
Triggering
Charging
IMS
Roaming
Support
Interoperability
(Internet protocols
e.g.SIP)
Bearer Control
Security
ITU-T
Ubiquitous
Service
Delivery
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
3
Fixed Network Environment
Requirements
o legacy systems
• PSTN/ISDN/IN
• Terminals (fixed and moveable)
o Access Technologies
• xDSL
• Cable TV
• WLAN
• Wimax
• IP
• etc
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
4
Fixed Network Environment
What’s Missing?
o Alternative authentication procedures e.g.to
o
o
o
o
o
non I-SIM based cpe
Relax SIP constrains e.g. compression
Location management needs additional
signalling information
Different resource reservation at the access
Fixed network access security
Support Network Address and Port Translation
(NAPT)
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
5
Signalling and control perspective (1/2)
o Support for xDSL specific info e.g.
• P-CSCF discovery (e.g. addition of IPv4
mechanism)
• xDSL specific coding rules for the P-ChargingVector and P-Access-Network-info header
o SIP timers used between the UE and P-CSCF
• IETF timers used instead of GPRS specific timers
o P-CSCF procedures for supporting NAPT-(PT)
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
6
Signalling and control perspective (2/2)
o Relax SIP constraints at UE level e.g:
• Optional support for SIP compression (rfc3320, rfc3486)
• Optional support for Media-Authorization (rfc3313)
• Optional support for Precondition (rfc3312)
o Addition of SIP capabilities in support of
supplementary services e.g.
•
•
•
•
•
Call Diversion
Message Waiting indication
XML/MIME for AoC
MCI
CCBS etc…
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
7
Convergence
CPE Equipment
Access Networks
Application Servers
xDSL
3G Mobile
WLAN
IMS
Internet
Cable
Transport Layer
WIMAX
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
8
Conclusion
o IMS architecture is access independent but
….additional procedures signalling capabilities
need to be added to support specific fixed
network requirements
o Work to define these enhancements currently
in progress in Study Group 11 and 13.
• FGNGN output document “IMS for Next
Generation Networks (IFN)”
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
9
Thank You
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
10
Background material
ITU-T
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
11
IMS Simplified Architecture
AS
Service
Layer
AS
HSS
CSCF
MRF
SG/MGCF
Control
Layer
MGW
Connectivity
Layer
ITU-T
IP/MPLS
Support systems
Management
PSTN/PLMN
ITU-T / ATIS Workshop “Next Generation Technology and
Standardization“
Las Vegas, 19-20 March 2006
Provisioning
Charging
Mediation
Number
Mapping
12
IMS Architecture in the NGN Environment
AS
Other IP Multimedia
PSTN
BGCF
MGW
PSTN
Mn
HSS
(AAA+DB)
CSCF
Mk
Mj
Cx
Mw
BGCF
Dh
Mi
Mg
Mb
MGCF
Mb
Dx
Mr
Mb
Mp
SLF
CSCF
MRFP
Mb
Sh
ISC
Mm
MRCF
Mw
P- CSCF
Gq
Gm
UE
IP Connectivity Access
N t
k
ITU-T / ATIS Workshop “Next Generation Technology and
ITU-T
Standardization“
Las Vegas, 19-20 March 2006
13