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cha_iptps08.ppt

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cha_iptps08.ppt

  1. 1. On Next-Generation Telco-Managed P2P TV Architectures Meeyoung Cha MPI-SWS Pablo Rodriguez Telefonica Research Sue Moon KAIST Jon Crowcroft U of Cambridge
  2. 2. Motivation <ul><li>Nationwide IPTV deployment </li></ul><ul><li>Understand implications of user behavior </li></ul><ul><li>Study the impact of Telco-managed P2P IPTV system </li></ul>
  3. 3. <ul><li>IPTV Network Studied </li></ul><ul><li>One of the first </li></ul><ul><li>One of the largest </li></ul><ul><li>150 TV channels </li></ul><ul><li>250,000 subscribers </li></ul><ul><li>1-month detailed log </li></ul>
  4. 4. Telco’s IPTV Architecture
  5. 5. <ul><li>All channels delivered to every DSLAM </li></ul>Live TV Set-top box TV DSLAM customer premise TV head end IP backbone Static multicast Dynamic Guaranteed Quality
  6. 6. <ul><li>VoD servers support rewind function </li></ul>Rewind TV Set-top box TV DSLAM customer premise VoD servers IP backbone Unicast
  7. 7. TV Viewing Habits
  8. 8. Channel Holding Time <ul><li>IPTV needs to support fast channel switching </li></ul>60% users spend less than 20 secs /channel
  9. 9. Temporal Correlation <ul><li>Viewing hours highly correlated over time </li></ul>Dining hours Weekends
  10. 10. Channel Popularity <ul><li>80% of views focused on top 20 channels </li></ul>
  11. 11. Per-Program Behavior <ul><li>Gradual audience ramp-up (asynchronous arrival) </li></ul><ul><li>High churn of viewers </li></ul><ul><li>Strong membership amongst users </li></ul><ul><li>Potential for P2P-based rewind function </li></ul>
  12. 12. Next-Generation IPTV Design
  13. 13. Future TV Design? Rewind from VoD server Telco-managed P2P Live from static multicast costly economical
  14. 14. <ul><li>Telco-Managed P2P TV </li></ul><ul><li>Home gateway or set-top box </li></ul><ul><li>Provisioned bandwidth (dedicated, symmetric) </li></ul><ul><li>Smart peer selection </li></ul>
  15. 15. Evaluation Using Real Trace
  16. 16. P2P Live TV <ul><li>P2P TV can carry a larger number of channels </li></ul>Why? Few hundred users per DSLAM Users not active all the time Focus skewed to few channels Static IP multicast (num channels * num DSLAMs) Lower bound of P2P TV average = 17% Total backbone traffic
  17. 17. P2P-Assisted Rewind TV <ul><li>P2P can support 95% of rewind traffic </li></ul>VoD server load without P2P (100%) VoD load with P2P (5%) P2P traffic served within DSLAM (80%)
  18. 18. Contributions <ul><li>1. The first detailed study on Telco’s IPTV </li></ul><ul><li>2. Understand implications of user behaviors </li></ul><ul><li>3. Evaluate Telco-manage P2P TV design </li></ul><ul><ul><li>Huge potential for live and rewind TV </li></ul></ul>

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