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

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
fjlin@research.telcordia.com
Telcordia Technologies, Inc.
April 28, 2007

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
IMS-Based Next Generation Networks
CSCF MGCF
HSS
Applications
and
Services
OSA-SCS
IM CN
Subsystem
Legacy mobile signaling
networks
SGW
MRFP MGW
SGW
PSTN
MRFC
BGCF
IP/Multimedia
Networks
AS
SGSN
GGSN
PS-Domain
UTRAN
Mobile RANs CS-Domain
MSC
BGCF
SLF
IMS-SSF
PDF
IPCAN
Packet-Cable 2.0
3G Cellular
DSL

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 R1 NGN 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
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
IMS in Mobile Networks (3GPP,
3GPP2, WLAN, WiMAX)
ƒ 3GPP has IMS ownership and will continue evolve
IMS to meet the needs of various access networks.
ƒ 3GPP2 adopts IMS as the core of its Multi-Media
Domain (MMD) architecture but adds CDMA2000
access specific changes.
ƒ WLAN have been integrated with IMS in 3GPP
Release 6 using a loosely coupled architecture.
ƒ WiMAX follows the WLAN approach but adds
WiMAX access specific changes to its IMS
architecture.

7
IMS in 3GPP
ƒ IMS Phase 1 (3GPP Release 5)
ƒ Provisioning of IP-based multimedia services
ƒ Call control and roaming to support IMS in UMTS
ƒ Access Security for IMS
ƒ Lawful interception
ƒ Charging and OAM&P for IMS
ƒ IMS Conferencing
ƒ IMS Messaging
ƒ IMS Group Management
ƒ Interworking with WLAN
ƒ Additional SIP capabilities (e.g. forking)
ƒ Interworking with non IMS SIP networks (IETF SIP, IPV4)
ƒ Interworking between IMS and CS networks
ƒ Interworking and migration scenario for IPv4 based IMS
ƒ QoS improvements (Gq)
ƒ Flow-Based Charging
ƒ Presence
ƒ Fixed Broadband Access to IMS
ƒ Emergency calls in PS and IMS
ƒ End-to-end QoS
ƒ Combining CS with IMS
ƒ Policy Control Evolution and Charging
Accommodation of
requirements from
DSL and Cable
Accommodation of
requirements from
WLAN

8
IMS in 3GPP2 MMD
ƒ MMD consists of the following:
ƒ IMS (IP Multimedia Subsystem)
ƒ Packet Data Subsystem (vs. GPRS in 3GPP)
ƒ 3GPP2 IMS
ƒ Added flexibility (e.g. placement of P-CSCF)
ƒ Access network specific changes (e.g. QoS, Mobility)
ƒ Supports alternate authentication schemes etc.
ƒ 3GPP2 PDS
ƒ AAA, Policy, and Security Functions
ƒ Home Agent (HA)
ƒ Foreign Agent (FA)
ƒ PDSN (Packet Data Service Node)
ƒ PCF (Packet Control Function)
ƒ MMD Rev 0 in December 2003
ƒ MMD Rev A in November 2005
ƒ Now wrapping up MMD Rev B, starting Rev C.

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
IMS in Fixed Networks (DSL, Cable)
ƒ DSL
ƒ Under NGN (Next Generation Network) Initiative ITU-T and
ETSI TISPAN develop IMS suited for DSL networks.
ƒ Both 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.
ƒ Cable
ƒ Under PacketCable 2.0 Initiative, Cable Labs is defining an
end-to-end architecture for providing real-time IP
communication services based on IMS
ƒ The goal is to extend cable’s existing Internet Protocol
service environment to accelerate the convergence of
voice, video, data, and mobility technologies

11
IMS in TISPAN and ITU-T NGN
R eso u rce an d A d m issio n
C o n tro l F u n ctio n s
R A C F
N etw o rk A ccess
A ttach m en t F u n ctio ns
N A A F
O th er M u ltim ed ia
C o m p o n en ts …
S tream in g S erv ices
A p p licatio n F u n ctio n s
C o re tran sp o rt
F u n ctio n s
A ccess T ran sp o rt
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
P S T N / IS D N E m u lation
IP M ultim ed ia C o m p o n e n t
& P S T N /IS D N S im u la tio n
N N I
T ra n sp o rt S tra tu m
S erv ice S tra tu m
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
C u sto m er an d
T erm in al F u n ctio n s
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
C u sto m er an d
R A C F
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
in c lu d in g
P S T N /IS D N S im u la tio n
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
E n d -u ser
F u n ctio n s
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
C u sto m er an d
R A C F
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
C u sto m er an d
R A C F
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
C u sto m er an d
R A C F
R A C F
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
N etw o rk A ccess
N A A F
C o re tran sp o rt
F u n ctio n s
F u n ctio n s
N G N
T erm inals
C ustom er
N etw orks
U ser
P ro file
F u n ctio n s
Other
Networks
L ega cy
T erm inals
G W
in c lu d in g
P S T N /IS D N S im u la tio n
N N I
U N I
E d ge
F un ctions
A ccess
F u nctio ns
S erv ice
an d
C o n tro l
F u n ctio n s
E n d -u ser
F u n ctio n s
FGNGN-OD-00229
Source: ITU-T FGNGN

12
IMS in PacketCable 2.0
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
IMS Technical Challenges
ƒ Non-SIP applications - The lack of support for
non-SIP-based applications and products is
the biggest concern.
ƒ Security – Both network and device security
enhancements are required.
ƒ Wireless 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
Key A-IMS Concepts
ƒPolicy Server is designed to coordinate overall
network resource usage including both SIP and
non-SIP applications.
ƒService Broker can handle interactions between
SIP and non-SIP applications.
ƒSecurity agent capabilities are extended to all
network devices.
ƒUse Security Manager to 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.
ƒ This 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
IMS Readiness
2005 2006 2007 2008
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 and ensure
convergence to IMS/NGN
•Both fixed and mobile operators can leverage the standardized solution.
•Achieve “True” fixed mobile convergence.
Gaps
IMS R5
2009
Converged
2010 2011 2012

16
IMS Impact to Legacy
Telecommunications Systems
ƒ IMS is set to eventually replace legacy
telecommunications systems (LTS).
ƒ But this will be evolutionary rather than
revolutionary.
ƒ Need to consider the co-existence of LTS and
IMS for at least next five years.
ƒ Keys to drive the evolution toward IMS/NGN
include
ƒ Service differentiators for new revenue
ƒ Reduced operations and capital expense
ƒ A smooth transition strategy

17
Conclusion
ƒ IMS has been adopted by all major access
technologies as the core network service
architecture.
ƒ However, not all technical challenges behind the
practical applicability of IMS have been addressed.
ƒ We believe the use of experimental IMS testbeds to
discover and address these technical issues are very
critical at this point of standards development.
ƒ These testbeds can assist and enable smooth
deployment of the IMS-Based Next Generation
Networks that are not addressed in the standards
specifications.

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