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Enhancing Video Conferencing: Effective Bandwidth Control Strategies

This presentation discusses bandwidth control in video conferencing systems, addressing challenges and solutions that arise when managing multiple video windows. Presented by Lee Hooi Sien in Fukuoka, Japan (January 23, 2003), it highlights the benefits of effective communication and productivity improvement. The drawbacks of increased control complexity, bandwidth issues, and video quality degradation are examined. Methods such as multicast, rate control, and preemptive bandwidth allocation are proposed to optimize video streams. Effective bandwidth management is crucial for ensuring high-quality video conferencing experiences.

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Enhancing Video Conferencing: Effective Bandwidth Control Strategies

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Presentation Transcript

  1. Bandwidth Control in Multiple Video Windows’ Conferencing System Fukuoka , Japan 23 January 2003 Present by : Lee Hooi Sien

  2. Benefits • Communicate with multiple parties at the same time • Improve Productivity • Allow boardroom conferencing

  3. Network Protocol

  4. Drawbacks • Control Complexity Increase • Bandwidth problem • Congestion occurs • Packet loss • Severe drop in video quality.

  5. Solving Methods • Multicast • Rate Control • Preemptive Bandwidth Allocation

  6. Multicast • Assign group IP addresses to groups of users • Information just need to be sent once to the group IP address • Uses network resources and bandwidth more efficiently

  7. Rate Control • Two Main functions • Estimate the available bandwidth • Match video rate to available bandwidth • Can be performed at : • Sender • Receiver

  8. Rate Control - Source • Source explicitly adapts the video rate. • Feedback from the receiver is used to estimate the available bandwidth – Packet loss rate. • Methods for estimating bandwidth • Probe-based method

  9. Rate Control - Receiver • Selects the video rate from a number of possible rates. • Method used : Receiver Driven Layered Multicast • Sender codes video with scalable or layered coder • Sends different layers over different multicast groups • Receives an appropriate number of layers up to its available bandwidth.

  10. Rate Control - Receiver • Need modification – Not suitable for multiple data streams transmission. • Proposed method – Based on Receiver-based Layered Multicast (RLM) • Utilize priority information on the video quality • Specify which video stream should be received with high quality • Others received with the lowest quality • Only allow adjustment for high priority video stream

  11. Preemptive Bandwidth Allocation • Flexibly decreased or increased according to the congestion of networks. • Main function – preempt bandwidth • Condition – Shared-based multicast tree • Involve 2 admission controls

  12. Admission Control • First Admission Control • Check available bandwidth • Satisfied?? • If not, proceed to second admission control • Second Admission Control • Check if any possible bandwidth preemption • If succeed, calculate amount of preemptable bandwidth has to release

  13. Conclusion • Bandwidth control is important in conferencing system because :- • Video packets require higher bandwidth • Multiple video stream • Complexity in controlling the streams

  14. Thank You

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