Testing IMS Networks
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Testing IMS Networks

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  • Multiplexing – S-CSCF funnels all services through a common element

Testing IMS Networks Testing IMS Networks Presentation Transcript

  • IMS Service Monitoring
  • Will Brouwer Business Development [email_address] Converged Tool Set
    • End-to-End
    • Phased Analysis
    • Converge Platform
    • Management Challenges
    • Key Lessons
  • End-to-End Visibility HSS UTRAN GSM Cable/xDSL/WiFi Access Node B-RAS IP IP IMS VoIP Signaling SS7 HLR IPTV & VoD Content & Services Interconnect Access GPRS IP SS7 GPRS IP SS7 IMS VoIP GPRS IP SS7 IMS VoIP Content SS7 IMS VoIP Media/MOS IPTV, VoIP P-CSCF PDF Node B Node B BTS BTS SGSN GGSN GPRS MGW MSC Server MSC STP I-CSCF S-CSCF BGCF MGCF SIG G/W MRFP MRFC App Servers
  • Phased Analysis Sample Agilent IMS trace from SIP-based combined wireless/wireline device Interpret.. Analyze.. Guide.. Reactive Proactive Customers Converged Network & Services GSM GPRS UMTS WiFi VoIP HSS Implementation Lab & Trial Engineering Operations & NOC P-CSCF PDF I-CSCF S-CSCF BGCF MGCF SIG G/W MRFP MRFC App Servers
  • Convergent Platform Data Gathering Probes Correlation & xDR Generation Measurement Framework xDR Store xDR enrichment Convergent Applications
  • 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
  • Key Lessons
    • New Paradigm for troubleshooting
      • Real-time and Historic view is essential
    • Continuous Evolution
      • 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
  • 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
          • 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
    MGCF I-CSCF P-CSCF PDF MRFC S-CSCF BGCF
  •