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Network Planning to Ensure Quality of Experience

Network Planning to Ensure Quality of Experience. IP Video Trends. Defining video over IP Video on the Internet IPTV in the service provider network Video communications. IP Video Trends. Coming Soon … More high definition broadcast More HD on-demand New interactive services

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Network Planning to Ensure Quality of Experience

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  1. Network Planning to Ensure Quality of Experience

  2. IP Video Trends • Defining video over IP • Video on the Internet • IPTV in the service provider network • Video communications

  3. IP Video Trends Coming Soon … • More high definition broadcast • More HD on-demand • New interactive services • Continuous service rollouts

  4. Multiplay Architecture A service provider’s perspective

  5. Multiplay Delivery Bandwidth Requirements • A typical US home has 3 TV sets • 2 SD streams @ 2Mbps + 1 HD stream @ 5Mbps + HSI at 5Mbps = 14 Mbps per home • To compete in North America, bandwidth to homes and QoS are key • In other parts of the world, access links of 20 Mbps are simply not available Source: Metro Ethernet Forum.

  6. Multiplay Delivery Channel switching • IP networks provide channels “on-request” • IGMP performance directly impacts channel change • But there are more factors that impact perceived channel zap speed

  7. Application-Layer Forwarding

  8. Challenges • Emulate realistic subscriber behavior • Multiple applications including web, voice-over-IP, video, P2P to name a few • Application and usage profile over a period of time Total BW Usage over Time 75 % Bandwidth Usage 50 Typical Subscriber Pool 25 Time Define Service Profile For each service or application, create a load profile that will make up the combined usage profile

  9. Challenges • Every service has a different customer QoE expectation

  10. Video Technologies What is a good quality score? • There is no standardized VQS • Encoders affect VQ (e.g.) • HD at 12 Mbps can score lower than a SD at 12 Mbps • Why? Compression! • Scores must reflect absolute and relative scores

  11. % Service Usage Ave QoS Time Time Challenges • Model a city-scale of subscribers • Having success in the lab using a controlled and small volume of traffic does not guarantee success in the field • Must model high volumes of subscribers to understand how well the service delivery network scales

  12. Challenges • Know the user experience • Correlate QoE delivered on a per-service and per-user basis • Determine subscribers/services that did not receive defined SLA • Understand the impact of one service on another as it competes for network resources • Especially for voice and video services Quality issues remain a significant challenge for IPTV as the service grows

  13. Testing Requirements • Basic simulation of multiplay traffic • Real-world testing as part of a comprehensive test plan • Core performance of edge and core routers • Use real traffic to max throughput of unicast and multicast traffic • Scalability testing of multicast over L2, L3 topologies • Determine loss, jitter, latency and scalability of overlay topology

  14. Testing Requirements • Verify QoS on the provider-edge network • Complex in nature, modeling of subscriber traffic is needed • Inter-operability and scalability of VoD server • Determine throughput, loss, jitter, QoE • Quality of experience (QoE) • Applicable everywhere in SP and NEMS methodologies

  15. Testing Requirements • Emulate “real” application traffic at 10 Gbps line rate • Voice, video and data • Tens of thousands of clients/servers • Measure performance and QoE • HTTP page delivery • VoIP call setup time • FTP file transfer rate • Consistent, reliable video delivery and quality • Video channel change time • P2P throughput • Negative tests and attack traffic to verify performance effects on other services • Scalability: How many?

  16. Testing Requirements • Highly scalable, integrated test solution • Assess the performance of multiplay networks and devices • Emulate subscribers with multiplay traffic • Ensure quality of experience in a converged network • Provide support for video, voice and data traffic • Data (HTTP, FTP, SMTP) • Video (IGMP, MLD, RTSP) • Voice (SIP, MGCP) • Both IPv4 and IPv6

  17. Testing Solution • Determine quality • Performance benchmarking • Rich tools

  18. Thank You

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