pdfslide.net_status-of-ims-based-next-generation-networks-for-fixed-of-ims-based-next-generation.pdf

net_status-of-ims-based-next-generation-networks-for-fixed-of-ims-based-next-generation.pdf

1. 1
Status of IMS-Based Next Generation
Networks for Fixed Mobile
Convergence
Copyright
©
2007 Telcordia Technologies. All Rights Reserved.
Prepared for:
WOCC 2007
Fuchun Joseph Lin
Chief Scientist
[email protected]
Telcordia Technologies, Inc.
April 28, 2007

2. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
2
Outline
ƒEvolution to IMS-Based Next Generation
Networks
ƒMobile Networks (3GPP, 3GPP2, WLAN, WiMAX)
ƒFixed Networks (DSL, Cable)
ƒIMS Technical Challenges
ƒVerizon Wireless A-IMS
ƒIMS Readiness and Its Impact to Legacy
Telecommunications Systems
ƒConclusion

3. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
3
IMS-Based Next Generation Networks
CSCF
MGCF
HSS
Applications
and
Services
OSA-SCS
IM CN
Subsystem
Legacy mobile signaling
networks
SGW
MRFP
MGWSGW
PSTN
MRFC
BGCF
IP/Multimedia
Networks
AS
SGSNGGSN
PS-Domain
UTRAN
Mobile RANs
CS-Domain
MSC
BGCF
SLF
IMS-SSF
PDF
IPCAN
Packet-Cable 2.0
3G Cellular
DSL

4. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
4
Evolution to IMS-Based Next
Generation Networks (1)
3GPP IMS
3GPP Release 5
IMS Phase 1
March
2003
3GPP Release 6
IMS Phase 2
December
2003
December
2005
June 2004
March
2005
3GPP Release 7 IMS Phase 3
3GPP Release 8
December
2006
PacketCable 2.0
Adopts IMS
ETSI
TISPAN_NGN
TISPAN NGN R1NGN R2
ITU-T FG NGN and IPTV ATIS NGN FG and IIF
ITU-T NGN R1
NGN Gap Analysis
NGN-GSI
IPTV
IPTV
WiMAX CSN 1.5
Adopts IMS
3GPP2 MMD

5. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
5
Evolution to IMS-Based Next
Generation Networks (2)
OMA
Has adopted IMS
Starting with Extended
IMS from TISPAN
ATIS
NGN-FG
ITU-T NGN GSI
FMC
NGN
Based on IMS with
Broadband support
(e.g. xDSL)
NGN
Extended IMS
For Fixed Networks
Fixed
ETSI TISPAN
ATIS (NA)
ETSI (Europe)
CCSA (China)
TTA (Korea)
ARIB (Japan)
TTC (Japan)
3GPP
Cellular
IETF
IMS
Specification
Reqts
CableLabs
PacketCable 2.0
Has adopted IMS
WiMAX Forum
NWG 1.5
Has adopted IMS
Mobile

6. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
6
IMS in Mobile Networks (3GPP,
3GPP2, WLAN, WiMAX)
ƒ3GPP has IMS ownership and will continue evolve
IMS to meet the needs of various access networks.
ƒ3GPP2 adopts IMS as the core of its Multi-Media
Domain (MMD) architecture but adds CDMA2000
access specific changes.
ƒWLAN have been integrated with IMS in 3GPP
Release 6 using a loosely coupled architecture.
ƒWiMAXfollows the WLAN approach but adds
WiMAXaccess specific changes to its IMS
architecture.

7. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
7
IMS in 3GPP
ƒIMS Phase 1 (3GPP Release 5)
ƒProvisioning of IP-based multimedia services
ƒCall control and roaming to support IMS in UMTS
ƒAccess Security for IMS
ƒLawful interception
ƒCharging and OAM&P for IMS
ƒIMS Phase 2 (3GPP Release 6)
ƒIMS Conferencing
ƒIMS Messaging
ƒIMS Group Management
ƒInterworking with WLAN
ƒAdditional SIP capabilities (e.g. forking)
ƒInterworking with non IMS SIP networks (IETF SIP, IPV4)
ƒInterworking between IMS and CS networks
ƒInterworking and migration scenario for IPv4 based IMS
ƒQoS improvements (Gq)
ƒFlow-Based Charging
ƒPresence
ƒIMS Phase 3 (3GPP Release 7)
ƒFixed Broadband Access to IMS
ƒEmergency calls in PS and IMS
ƒEnd-to-end QoS
ƒCombining CS with IMS
ƒPolicy Control Evolution and Charging
Accommodation of
requirements from
DSL and CableAccommodation of requirements from WLAN

8. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
8
IMS in 3GPP2 MMD
ƒMMD consists of the following:
ƒIMS (IP Multimedia Subsystem)
ƒPacket Data Subsystem (vs. GPRS in 3GPP)
ƒ3GPP2 IMS
ƒAdded flexibility (e.g. placement of P-CSCF)
ƒAccess network specific changes (e.g. QoS, Mobility)
ƒSupports alternate authentication schemes etc.
ƒ3GPP2 PDS
ƒAAA, Policy, and Security Functions
ƒHome Agent (HA)
ƒForeign Agent (FA)
ƒPDSN (Packet Data Service Node)
ƒPCF (Packet Control Function)
ƒMMD Rev 0 in December 2003
ƒMMD Rev A in November 2005
ƒNow wrapping up MMD Rev B, starting Rev C.

9. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
9
IMS in WLAN and WiMAX
WAG
PDG
CSN
IWU
WLAN
Access Network
WiMAX
Access Network
3GPP
AAA
Server
IMS
Home
IMS Core Network
Loosely Coupled Approach
PDG – Packet Data Gateway •Service authentication and
authorization
•IP address allocation
•Policy enforcement and charging
WAG – WLAN Access Gateway
•Provide access to IMS services
•Route packets via PLMN to PDG
•Perform accounting and policy
enforcement
CSN IWU – CSN IWK Unit •Provide local IP address management (DHCP,
DNS)
•Provide NAT function
CSN – WiMAX Connectivity Service Network

10. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
10
IMS in Fixed Networks (DSL, Cable)
ƒDSL
ƒUnder NGN (Next Generation Network) Initiative ITU-T and
ETSI TISPAN develop IMS suited for DSL networks.
ƒBoth TISPAN and ITU-T NGN Release 1 (supported by
IMS Phase 3 in 3GPP Release 7) was finished at the end
of 2005. Release 2 has been ongoing since 2006.
ƒCable
ƒUnder PacketCable 2.0 Initiative, Cable Labs is defining an
end-to-end architecture for providing real-time IP
communication services based on IMS
ƒThe goal is to extend cable’s existing Internet Protocol
service environment to accelerate the convergence of
voice, video, data, and mobility technologies

11. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
11
IMS in TISPAN and ITU-T NGN
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
&PSTN/ISDN Simulation
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
Customer and
Terminal Functions
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
&PSTN/ISDN Simulation
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
Customer and
Terminal Functions
Resource and Admission
Control Functions
RACF
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
in c lu d in g
P S T N /IS D N S im ulatio n
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
End-user
Functions
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
&PSTN/ISDN Simulation
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
Customer and
Terminal Functions
Resource and Admission
Control Functions
RACF
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
&PSTN/ISDN Simulation
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
Customer and
Terminal Functions
Resource and Admission
Control Functions
RACF
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
&PSTN/ISDN Simulation
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
Customer and
Terminal Functions
Resource and Admission
Control Functions
RACF
Resource and Admission
Control Functions
RACF
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Network Access
A ttachm ent Functions
NAAF
O ther M ultim edia
Components …
Streaming Services
Application Functions
Core transport
Functions
Access Transport
Functions
NGN
Terminals
Customer
Networks
User
Profile
Functions
Other Networks
Legacy
Terminals
GW
PSTN / ISDN Emulation
IP M ultim edia Com ponent
in c lu d in g
P S T N /IS D N S im ulatio n
NNI
Transport Stratum
Service Stratum
UNI
Edge
Functions
Access
Functions
Service
and
Control
Functions
End-user
Functions
FGNGN-OD-00229
Source: ITU-T FGNGN

12. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
12
IMS in PacketCable2.0
P-CSCF
I-CSCF
Application
Servers
HSS
Subscriber
Management
Applications
Session
Control
Handsets
SLF
S-CSCF
GPRS/other
GSM
PSTN
Interconnect via
PacketCable 1.5
Policy Control
via
PacketCable
Multimedia
IP connectivity
via DOCSIS
Access Network
PacketCable integrated an IMS core into the cable architecture
Interconnect with
PacketCable 1.5
telephony clients
(E-MTAs)
Cable clients
Client-managed
NAT & Firewall
Traversal
Cable-based
provisioning,
management,
and accounting
Enhancements
based upon cable
requirements
Source: CableLabs

13. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
13
IMS Technical Challenges
ƒNon-SIP applications -The lack of support for
non-SIP-based applications and products is
the biggest concern.
ƒSecurity –Both network and device security
enhancements are required.
ƒWireless VoIP -SIP needs to be optimized to
reduce mobile VoIP latency.
Verizon Wireless pointed out the above
IMS shortcomings when it announced its
A-IMS architecture initiative on 7/27/2006.

14. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
14
Key A-IMS Concepts
ƒPolicy Serveris designed to coordinate overall
network resource usage including both SIP and
non-SIP applications.
ƒService Brokercan handle interactions between
SIP and non-SIP applications.
ƒSecurity agent capabilities are extended to all
network devices.
ƒUse Security Managerto manage the overall
security policy of the network.
ƒUse Bearer Manager(Home Agent) to provide
two IP addresses and two anchors for a mobile
terminal, one in the home network and one in the
visiting network.
ƒThis dual anchoring concept allows latency-sensitive
application such as VoIP to use the visited anchor,
while other applications requiring service provider
control use the home anchor.

15. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
15
IMS Readiness
20052006 20072008
IMS/NGN Functionalities
*IMS R6
*IMS R7/NGN R1
*IMS R8/NGN R2
Critical time
for industry support
Opportunities!
Industry-wide
implementation of IMS/NGN
Diverged
IMS/NGN Specifications
•Opportunities: To prove business case and to narrow the gaps andensure
convergence to IMS/NGN
•Both fixed and mobile operators can leverage the standardized solution.
•Achieve “True”fixed mobile convergence.
Gaps
IMS R5
2009
Converged
201020112012

16. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
16
IMS Impact to Legacy
Telecommunications Systems
ƒIMS is set to eventually replace legacy
telecommunications systems (LTS).
ƒBut this will be evolutionary rather than
revolutionary.
ƒNeed to consider the co-existence of LTS and
IMS for at least next five years.
ƒKeys to drive the evolution toward IMS/NGN
include
ƒService differentiators for new revenue
ƒReduced operations and capital expense
ƒA smooth transition strategy

17. Copyright © 2007 Telcordia Technologies. All Rights Reserved.
17
Conclusion ƒIMS has been adopted by all major access
technologies as the core network service
architecture.
ƒHowever, not all technical challenges behind the
practical applicability of IMS have been addressed.
ƒWe believe the use of experimental IMS testbedsto
discover and address these technical issues are very
critical at this point of standards development.
ƒThese testbedscan assist and enable smooth
deployment of the IMS-Based Next Generation
Networks that are not addressed in the standards
specifications.