Testing IMS Networks

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

    1. 1. IMS Service Monitoring
    2. 2. Will Brouwer Business Development [email_address] Converged Tool Set <ul><li>End-to-End </li></ul><ul><li>Phased Analysis </li></ul><ul><li>Converge Platform </li></ul><ul><li>Management Challenges </li></ul><ul><li>Key Lessons </li></ul>
    3. 3. 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
    4. 4. 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
    5. 5. Convergent Platform Data Gathering Probes Correlation & xDR Generation Measurement Framework xDR Store xDR enrichment Convergent Applications
    6. 6. IMS Management Challenges <ul><li>Significant amounts of inter-working with other protocols </li></ul><ul><li>Interoperability (mobility, NEMs) </li></ul><ul><li>Location & Presence </li></ul><ul><li>Many elements involved in call setup path </li></ul><ul><li>Services are easy to deploy but few tools to quantify impact on network </li></ul><ul><li>Troubleshooting is complex </li></ul><ul><li>Managing the end-to-end customer experience </li></ul><ul><li>And…. </li></ul><ul><li>Specs are evolving fast: significant extensions to signalling procedures </li></ul><ul><li>IPSec with null encryption within IMS </li></ul><ul><li>IPv6 </li></ul><ul><li>Compressed SIP </li></ul>
    7. 7. Key Lessons <ul><li>New Paradigm for troubleshooting </li></ul><ul><ul><li>Real-time and Historic view is essential </li></ul></ul><ul><li>Continuous Evolution </li></ul><ul><ul><li>Services – i.e. signaling and service flows </li></ul></ul><ul><ul><li>Architectures – session border controllers </li></ul></ul><ul><ul><li>Equipment – e.g. handset firmware changes behavior </li></ul></ul><ul><ul><li>Protocol implementation/stacks - vary widely </li></ul></ul><ul><ul><li>User community dynamics </li></ul></ul><ul><li>What to measure? </li></ul><ul><ul><li>KPIs need to be service-centric in addition to network </li></ul></ul><ul><ul><li>Element Capacity and Load – prediction and monitoring </li></ul></ul><ul><ul><li>Trunk planning on media gateway </li></ul></ul><ul><li>Performance? </li></ul><ul><ul><li>Data retention, Transaction rate </li></ul></ul>
    8. 8. Key Lessons <ul><li>IMS Monitoring Strategy </li></ul><ul><li>Prioritize monitoring of nodes according to …. </li></ul><ul><ul><ul><ul><li>Does the node inter-work with another protocol? </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Does the node perform a critical service routing decision? </li></ul></ul></ul></ul><ul><li>Suggested order of priorities </li></ul><ul><ul><ul><ul><li>I-CSCF => Gatekeeper to network </li></ul></ul></ul></ul><ul><ul><ul><ul><li>S-CSCF => Decides on admission to services and routes services </li></ul></ul></ul></ul><ul><ul><ul><ul><li>MGCF => Circuit inter-working. Access to media path QoS info </li></ul></ul></ul></ul><ul><ul><ul><ul><li>MRFC => Access to media QoS information </li></ul></ul></ul></ul><ul><ul><ul><ul><li>P-CSCF => Simple load balancer </li></ul></ul></ul></ul>MGCF I-CSCF P-CSCF PDF MRFC S-CSCF BGCF

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