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Status of IMS-Based Next Generation Networks for Fixed Mobile Convergence

Copyright © 2007 Telcordia Technologies. All Rights Reserved.

Prepared for:WOCC 2007

Fuchun Joseph LinChief Scientist [email protected] Technologies, Inc. April 28, 2007

Copyright © 2007 Telcordia Technologies. All Rights Reserved.2

Outline

Evolution to IMS-Based Next Generation Networks

Mobile Networks (3GPP, 3GPP2, WLAN, WiMAX)Fixed Networks (DSL, Cable)

IMS Technical ChallengesVerizon Wireless A-IMS

IMS Readiness and Its Impact to Legacy Telecommunications Systems Conclusion


IMS-Based Next Generation Networks

CSCF MGCF

HSSApplications

and Services

OSA-SCS

IM CN Subsystem

Legacy mobile signaling networks

SGW

MRFP MGW

SGW

PSTNMRFC

BGCF

IP/MultimediaNetworks

AS

SGSN

GGSN

PS-DomainUTRAN

Mobile RANsCS-Domain

MSC

BGCF

SLF

IMS-SSF

PDF

IPCANPacket-Cable 2.0

3G CellularDSL


Evolution to IMS-Based Next Generation Networks (1)

3GPP IMS3GPP Release 5IMS Phase 1

March 2003

3GPP Release 6IMS Phase 2

December 2003

December 2005

June2004

March2005

3GPP Release 7IMS Phase 3

3GPP Release 8

December 2006

PacketCable 2.0 Adopts IMS

ETSITISPAN_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


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

NGNBased on IMS withBroadband support

(e.g. xDSL)

NGNExtended IMS

For Fixed Networks

Fixed

ETSI

TISPAN

ATIS (NA)ETSI (Europe)CCSA (China)TTA (Korea)ARIB (Japan)TTC (Japan)

3GPP

Cellular

IETF

IMSSpecification

ReqtsCableLabs

PacketCable 2.0

Has adopted IMS

WiMAX Forum

NWG 1.5

Has adopted IMS

Mobile


IMS in Mobile Networks (3GPP, 3GPP2, WLAN, WiMAX)

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


IMS in 3GPPIMS Phase 1 (3GPP Release 5)

Provisioning of IP-based multimedia services Call control and roaming to support IMS in UMTSAccess Security for IMSLawful interception Charging and OAM&P for IMS

IMS Phase 2 (3GPP Release 6)IMS ConferencingIMS MessagingIMS Group ManagementInterworking with WLANAdditional SIP capabilities (e.g. forking)Interworking with non IMS SIP networks (IETF SIP, IPV4)Interworking between IMS and CS networksInterworking and migration scenario for IPv4 based IMSQoS improvements (Gq)Flow-Based ChargingPresence

IMS Phase 3 (3GPP Release 7)Fixed Broadband Access to IMSEmergency calls in PS and IMSEnd-to-end QoSCombining CS with IMSPolicy Control Evolution and Charging

Accommodation ofrequirements from DSL and Cable

Accommodation ofrequirements from WLAN


IMS in 3GPP2 MMD

MMD consists of the following:IMS (IP Multimedia Subsystem)Packet Data Subsystem (vs. GPRS in 3GPP)

3GPP2 IMSAdded flexibility (e.g. placement of P-CSCF)Access network specific changes (e.g. QoS, Mobility)Supports alternate authentication schemes etc.

3GPP2 PDSAAA, Policy, and Security FunctionsHome Agent (HA)Foreign Agent (FA)PDSN (Packet Data Service Node)PCF (Packet Control Function)

MMD Rev 0 in December 2003MMD Rev A in November 2005Now wrapping up MMD Rev B, starting Rev C.


IMS in WLAN and WiMAX

WAG PDG

CSNIWU

WLAN Access Network

WiMAXAccess Network

3GPPAAAServer

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


IMS in Fixed Networks (DSL, Cable)

DSLUnder NGN (Next Generation Network) Initiative ITU-T and ETSI TISPAN develop IMS suited for DSL networks.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.

CableUnder PacketCable 2.0 Initiative, Cable Labs is defining an end-to-end architecture for providing real-time IP communication services based on IMSThe goal is to extend cable’s existing Internet Protocol service environment to accelerate the convergence of voice, video, data, and mobility technologies


IMS in TISPAN and ITU-T NGN

R e so u rc e a n d A d m iss io n C o n tro l F u n c tio n s

R A C F

N e tw o rk A c c e ssA tta c h m e n t F u n c tio n s

N A A F

O th e r M u ltim e d ia C o m p o n e n ts …

S tre a m in g S e rv ic e s

A p p lic a tio n F u n c tio n s

C o re tra n sp o r t F u n c tio n s

A c c e ss T ra n sp o r t F u n c tio n s

N G N T e rm in a ls

C u s to m erN e tw o rk s

U se rP ro file

F u n c tio n s

Other N

etworks

L e g a c yT e rm in a ls

G W

P S T N / IS D N E m u la tio n

IP M u ltim e d 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 IT r a n sp o r t S tr a tu m

S e r v ic e S tr a tu m

U N I

E d g e F u n c tio n s

A c c e ss F u n c tio n s

S e rv ic e a n d

C o n tro l F u n c tio n s

C u s to m e r a n d T e rm in a l F u n c tio n s


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U N I



S e rv ic e a n d


E n d -u se r F u n c tio n s

FGNGN-OD-00229

Source: ITU-T FGNGN


IMS in PacketCable 2.0

P-CSCF

I-CSCF

ApplicationServersHSS

Subscriber Management Applications

Session Control

Handsets

SLFS-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


IMS Technical Challenges

Non-SIP applications - The lack of support for non-SIP-based applications and products is the biggest concern. Security – Both network and device security enhancements are required.Wireless VoIP - SIP needs to be optimized to reduce mobile VoIP latency.

Verizon Wireless pointed out the aboveIMS shortcomings when it announced itsA-IMS architecture initiative on 7/27/2006.


Key A-IMS ConceptsPolicy Server is designed to coordinate overall network resource usage including both SIP and non-SIP applications.Service Broker can handle interactions between SIP and non-SIP applications.Security agent capabilities are extended to all network devices.Use Security Manager to manage the overall security policy of the network.Use 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.

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.


IMS Readiness

2005 2006 2007 2008

IMS/NGN Functionalities

*IMS R6*IMS R7/NGN R1

*IMS R8/NGN R2

Critical timefor 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


IMS Impact to Legacy Telecommunications Systems

IMS is set to eventually replace legacy telecommunications systems (LTS).But this will be evolutionary rather than revolutionary.Need to consider the co-existence of LTS and IMS for at least next five years.Keys to drive the evolution toward IMS/NGN include

Service differentiators for new revenueReduced operations and capital expenseA smooth transition strategy


Conclusion

IMS has been adopted by all major access technologies as the core network service architecture.However, not all technical challenges behind the practical applicability of IMS have been addressed.We believe the use of experimental IMS testbeds to discover and address these technical issues are very critical at this point of standards development.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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