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IMS Service
Monitoring
Converged Tool Set
•End-to-End
•Phased Analysis
•Converge Platform
•Management Challenges
•Key Lessons
Will Brouwer
Business Development
[email protected]
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End-to-End Visibility
Manage
Troubleshoot
SS7
Access
GPRS
IP
UTRAN
GPRS
IP
Monitor & Alarm
SS7
GPRS
IMS
IP
VoIP
GPRS
SGSN
Content
SS7
HLR
Node B
SS7
IMS
VoIP
Install & Maintain
SS7
IMS
VoIP
Media/MOS
IPTV, VoIP
IPTV & VoD
STP
MSC
GGSN
IMS
Node B
HSS
GSM
BTS
App Servers
IP
MGW
MSC
Server
BTS
Cable/xDSL/WiFi
IP
Content & Services
S-CSCF
SIG
G/W
I-CSCF
BGCF
MRFP
P-CSCF
PDF
MGCF
MRFC
Interconnect
VoIP Signaling
Access
Node
B-RAS
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Phased Analysis
Converged
Network
& Services
Interpret..
Reactive
Analyze..
HSS
Lab & Trial
App Servers
Guide..
S-CSCF
SIG
G/W
I-CSCF
BGCF
MRFP
P-CSCF
PDF
MGCF
MRFC
GSM
VoIP
Implementation Customer
Operations
& NOC
WiFi
GPRS
UMTS
Engineering
Sample Agilent IMS
trace
from SIP-based
combined
wireless/wireline
device
Proactive
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Convergent Platform
Convergent Applications
Measurement
Framework
xDR Store
xDR enrichment
Correlation & xDR Generation
Data Gathering Probes
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IMS Management Challenges
•Significant amounts of inter-working with other protocols
•Interoperability (mobility, NEMs)
•Location & Presence
•Many elements involved in call setup path
•Services are easy to deploy but few tools to quantify impact on network
•Troubleshooting is complex
•Managing the end-to-end customer experience
And….
•Specs are evolving fast: significant extensions to signalling procedures
•IPSec with null encryption within IMS
•IPv6
•Compressed SIP
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Key Lessons
New Paradigm for troubleshooting
– Real-time and Historic view is essential
Continuous Evolution
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Services – i.e. signaling and service flows
Architectures – session border controllers
Equipment – e.g. handset firmware changes behavior
Protocol implementation/stacks - vary widely
User community dynamics
What to measure?
– KPIs need to be service-centric in addition to network
– Element Capacity and Load – prediction and monitoring
– Trunk planning on media gateway
Performance?
– Data retention, Transaction rate
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Key Lessons
•IMS Monitoring Strategy
•Prioritize monitoring of nodes according to ….
– Does the node inter-work with another protocol?
– Does the node perform a critical service routing decision?
•Suggested order of priorities
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I-CSCF => Gatekeeper to network
S-CSCF => Decides on admission to services and routes services
MGCF => Circuit inter-working. Access to media path QoS info
MRFC => Access to media QoS information
P-CSCF => Simple load balancer
S-CSCF
BGCF
MGCF
I-CSCF
MRFC
P-CSCF
PDF
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