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Challenges in Management of
IP Multimedia Subsystem (IMS)
September 30, 2006
For more information, contact:
David P. Strand
CMTS
Lucent Technologies
Bell Labs
+1-(623)-581-4479
strandd@lucent.com
Overview
IMS Overview
Management Considerations for IMS
– Fault Management
– Configuration Management
– Accounting Management
– Performance Management
Summary
9/30/2006 David P. Strand * AP-NOMS 2006 2
3GPP/3GPP2 IMS Network Architecture
Control PDN
Mb/36/38
Bearer Mb/42
MGW
MGW
Blue = 3GPP definition Mb/34
MRFP
MRFP Mb/33
Red = 3GPP2 definition Mb/32/37
Mk/tbd Mc/30
Black = Common definition Mp/25 Mm/tbd
Green = Not Common Mj/17 PSTN /
MRFC
MRFC BGCF MGCF
MGCF
BGCF PLMN
Mr/24
PSTN/26
Mi/ee Mg/17
Packet Data Go/28 Mw/
Packet Data PDF
PDF dd/ff
Subsystem
Subsystem CSCF
CSCF OSA-SCS OSA-AS
OSA-AS
ISC/12 OSA-SCS
23 OSA
Cx/16
For 3GPP, the PDF is within the
AAA
AAA Sh/7/11 SIP-AS
SIP-AS P-CSCF. For 3GPP2, the PDF is
3 4 a network entity of it’s own.
Radio Access For 3GPP the HSS also contains
Radio Access Databases HLR functionality which is not
UA Databases
Network
Network shown here. For 3GPP2 the AAA
Home Subscriber
Home Subscriber
Server function shown in the HSS is a
Server
stand-alone entity.
IP Core Network Multi-media
IP Core Network Multi-media Additional interfaces exist in both
the 3GPP and 3GPP2 reference
Subsystem (IMS)
Subsystem (IMS) models but are not included in this
proposal for harmonization.
9/30/2006 David P. Strand * AP-NOMS 2006 3
IMS Functional Architecture
IMS IS:
Web Portal
Application
Layer A VoIP Telephony and
Application Multimedia Services Architecture
Servers
Defined with Open Standard
Interfaces -> 3GPP and 3GPP2
Session Session Centralized Based on IETF Protocols (SIP,
Control Control Databases
Layer RTP, ..)
CSCF HSS
Designed for Both Wireless and
Access Media Wireline Networks
Network Servers
A Solution for Service
Transparency
Media
Control & Capable of Interworking with
Gateways PSTN and Legacy IN Based
Media and Services
End Point
Layer Other
Networks CSCF – Call Session Control Function
HSS – Home Subscriber Server
9/30/2006 David P. Strand * AP-NOMS 2006 4
Fault Management
Voice Quality Testing
fault equipment – Some standards exist
detection diagnostics
– Approval not universal
– Issues in differentiating between
network and CPE contribution to
fault voice quality voice quality
reporting testing
Multimedia Quality Verification
– Few standards exists for services
repair multimedia involving multiple media
procedures quality
– Not a current issue, but will become
one as complexity increases
Legend:
no significant changes
some changes or minor issues
major changes or issues
9/30/2006 David P. Strand * AP-NOMS 2006 5
Configuration Management
DNS/ENUM provisioning
– Problem space well-defined
equipment DNS/ENUM
provisioning provisioning – Standards well-defined
– Key impact lies in extending existing
processes and procedures
subscriber trunk/route Trunk/Route provisioning
provisioning provisioning
– Similar to mapping of trunk groups
and members to DS1 facilities
– Opportunity to greatly simplify
service UE/CPE traditional trunk paradigms
provisioning provisioning
UE/CPE provisioning
– UE/CPE have significant intelligence
Legend: – Subscriber, service, and security
no significant changes
some changes or minor issues data must be provisioned in CPE/UE
major changes or issues
– Few standards exists
9/30/2006 David P. Strand * AP-NOMS 2006 6
Accounting Management
Usage Data Generation
usage data
– Different types of usage
generation
– Event-based billing
– Different data formats
usage data – Necessitates mediation functions
collection
Usage Data Collection
call / event – Different collection mechanisms
rating – Generally utilizing file transfer
– Somewhat akin to AMADNS
bill bill
generation rendering Call / Event Rating
– Affected by new types of usage
– May occur at different points in the
Legend:
no significant changes
billing flow (including within the
some changes or minor issues network)
major changes or issues
9/30/2006 David P. Strand * AP-NOMS 2006 7
Performance Management
Data Generation
data
– Numerous new measures
generation
• Delay, lost packets, etc
– Traditional trunk measures
data
collection Capacity Engineering
– Based on similar principles
– Data is significantly different
threshold
alerting – Opportunity to size facilities based on
coarser granularity than with traditional
trunk paradigms
capacity congestion
engineering management Congestion Management
– Need a completely different paradigm
– Based on resource allocation
Legend:
no significant changes
– RACF / RACS models provide the
some changes or minor issues means; implementations commencing
major changes or issues
9/30/2006 David P. Strand * AP-NOMS 2006 8
Summary
Most aspects of IMS and IP-based network management are
evolutionary, rather than revolutionary
Traditional solutions can be easily extended to address many of
the management problems
However, introduction of IP technology in the core network
introduces new management issues never encountered before
The most significant of these deal with
– (a) the new role of UE/CPE, with greater intelligence
– (b) new trunk paradigms
– (c) congestion management, addressed via RACF / RACS solutions
Security plays a far more prevalent role in IMS and IP-based
networks
9/30/2006 David P. Strand * AP-NOMS 2006 9
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