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Video Streaming over UMTS: practical issues

Video Streaming over UMTS: practical issues. Stefan Rugel, Klaus Schäfer February 2008. Agenda. 1. Scenarios for video streaming in mobile networks 2. Influences on Video Streaming Quality Problems Summary. Scenarios for (Video) Streaming in Mobile Networks. Mobile Operator & Partner.

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Video Streaming over UMTS: practical issues

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  1. Video Streaming over UMTS: practical issues Stefan Rugel, Klaus Schäfer February 2008

  2. Agenda • 1. Scenarios for video streaming in mobile networks • 2. Influences on Video Streaming Quality • Problems • Summary

  3. Scenarios for (Video) Streaming in Mobile Networks Mobile Operator & Partner Internet Mobile Internet IncreasingBandwidth Mobile Network More streaming content Increasing Streaming Capability mobile content, e.g videos: pay per video mobile content: pay per byte

  4. Scenarios for (Video) Streaming in Mobile Networks Mobile Devices: • Dedicated mobile content provided by network operators, partners and independent mobile web sites. Content adapted to SW-platform, display and bandwidth. • Growing streaming capability of handsets (display, UMTS, software) • Mobile Internet: Limitations due to bandwidth and software interoperability. Notebooks with wireless access: • Fixed-internet user experience limited by bandwidth.

  5. Scenarios: Some types of Video Streaming Without bandwidth constraints, progressive download is the best choice (simple, cheap) => todays internet dominated by Flash.

  6. Scenarios: Video Streaming Bandwidth Mbit/s UMTS bearer (384 kbit/s) too low for open internet streaming. No changes by codec improvement Quality Improvement? 1 HSDPA 0.5 384kbit/s UMTS Bearer Open Internet Mobile Content 0.1

  7. Influences on Video Streaming Quality Streaming Quality depends on many factors wireless If: Quality limit regarding Bitrate, jitter / packet loss Proxies: Adapts content presentation to capabilities of mobile device, may improve protocol dynamics with regard to wireless access conditions. Firewall: May block RTP streams. Mobile Device: Quality of implementation is crucial for video quality. May compensate shortcomings of wireless access. Server: Special care with encoding and compression in order to meet conditions at wireless interface.

  8. Measuring of User perceived quality Test Equipment Network Traces, DPI Network wide Overview on Quality, network centric Quality view. Use Case Statistics Customer Experience only spot checks expensive

  9. Measuring of User perceived quality (Core Network) • Quality Statistics: RTCP Receiver Report (Packet Loss, Jitter). • TCP Analysis • Bandwidth measurement • Open Internet: Statistic on Protocols used • RTSP (Flash): User Behaviour statistics • Open Internet: how many sessions do not get enough bandwidth?

  10. Measuring of User perceived quality • TCP graph core network of open internet streaming (windows media player) with UMTS bearer. • Stream bitrate > throughput capacity • low (no) quality Automatisation & Statistics ! Receiver Window Slope: 384kbit/s transmitted bytes to mobile Acked bytes by mobile

  11. Quality Model • High minimum key frame rate: lower video quality at given bitrate • Low minimum key frame rate: RLC packet loss impacts video quality • Influence RLC mode, TCP / UDP transport? Optimum key frame rate parameter (MTU size) often determined experimentally.

  12. Capacity and Video Streaming Quality • Currently no issue: enough reserve. • Dimensioning rules? • Benefit of QoS?

  13. QoS and Protocols: How long do we need RTSP/RTP • Benefit of UDP, Effect of TCP • Streaming Quality at capacity limit with TCP/UDP traffic mix

  14. Video Streaming in Mobile Networks: Main Issues • Good Video Streaming Performance in UMTS networks with dedicated mobile content. • Open internet streaming only partly successful, improvements with HSDPA expected (will mobile networks keep up with fixed internet access then?) • Quality of Service needed in higher loaded networks? Will RTSP/RTP survive? • Definitions/Algorythms for network KPIs for end user streaming quality?

  15. Thank you.

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