1 / 27

Omer Boyaci , Andrea Forte and Henning Schulzrinne

Omer Boyaci , Andrea Forte and Henning Schulzrinne. December 16,2009. Introduction. Performance of video chat applications under congestion Residential area networks (DSL and cable) Limited uplink speeds (around 1Mbit/s) Big queues in the cable/DSL modem(600ms to 6sec)

noah
Download Presentation

Omer Boyaci , Andrea Forte and Henning Schulzrinne

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Omer Boyaci, Andrea Forte and Henning Schulzrinne December 16,2009

  2. Introduction • Performance of video chat applications under congestion • Residential area networks (DSL and cable) • Limited uplink speeds (around 1Mbit/s) • Big queues in the cable/DSL modem(600ms to 6sec) • Shared more than one user/application • Investigate applications’ behavior under congestion • Whether they are increasing the overall congestion • Or trying to maintain a fair share of bandwidth among flows

  3. Experimental setup

  4. Video chat clients • Skype • Windows Live Messenger • X-Lite free softphone • Eyebeam

  5. Experiments • Step functions • 10 steps [1kbit/s-1024kbit/s] [10 sec in each step] • 2 steps [1kbits-1024kbit/s] [10 sec in each step] • Cross traffic • File transfer to mediafire • Bittorrent

  6. Experiment 1. Step 10sec10kbit

  7. Experiment 1. Step 10sec100kbit Skype

  8. Experiment 1. Step 10sec100kbit Live

  9. Experiment 1. Step 10sec100kbit X-Lite

  10. Experiment 1. Step 10sec100kbit Eyebeam

  11. Experiment 2. Step 10sec500kbit

  12. Experiment 2. Step 10sec500kbit Skype

  13. Experiment 2. Step 10sec500kbit Live

  14. Experiment 2. Step 10sec500kbit X-Lite

  15. Experiment 2. Step 10sec500kbit Eyebeam

  16. Experiment 3. File Transfer • 9MB file to uploaded to mediafire • If there is no cross traffic file upload fully utilizes the link

  17. Experiment 3. File Transfer Skype

  18. Live Experiment 3. File Transfer

  19. Experiment 3. File Transfer X-Lite

  20. Eyebeam Experiment 3. File Transfer

  21. Experiment 4. Bittorrent • Ubuntu 9.04 and Elephants Dream are shared • If there is no cross traffic bittorrent fully utilizes the link

  22. Skype Experiment 4. Bittorrent

  23. Live Experiment 4. Bittorrent

  24. Experiment 4. Bittorrent X-Lite

  25. Eyebeam Experiment 4. Bittorrent

  26. Skype Experiment 5. Random Loss

  27. Conclusion • We analyzed the behavior of Skype, Live Messenger, X-Lite and Eyebeam. • Skype behaved the best by adapting its codec parameters based not only on packet loss but also on RTT and jitter. This allowed Skype to closely follow the changes in bandwidth without causing any packet loss. • Eyebeam performed the worst with high fluctuations in the transmission speed of its video traffic and with poor adaptation to bandwidth fluctuations. • Due to limited upstream bandwidth, video clients must have bandwidth adaptation mechanisms and must be able to differentiate between wireless losses and congestion losses.

More Related