1. Layered Video over TCPW David Chanady, Nadeem Aboobaker, Jennifer Wong CS 215 Networking Fundementals Winter 2001 March 20, 2001

2. Goals To determine if streaming applications can effectively share network resources when using TCPW

3. TCPW BWE –Original purpose: To determine window size at TCP layer –Our application: To determine which video layers to send

4. Layered Video 5 layers, different quality Utilize layers according to BWE Layer 4Layer 3 Layer 2Layer 1 Layer 0

5. Layered Video over RTP Typical transport for streaming media Video ServerVideo Client RTP

6. Layered Video over TCPW Video Server TCPW BWE? To client BWE

7. Simulations NS2 Topology 5Mb 0.3Mb Video Server FTP Server Video Client FTP Client

8. Simulations Run for 20 seconds –Three different scenarios Looking at: –Adaptation of Layered Video server –Fair-sharing of link

9. Scenario: Simultaneous Layered Video starts at 0 seconds FTP starts at 0 seconds FTP ends at 15 seconds

10. Simultaneous Start: BWE

11. Simultaneous Start: Jitter

12. Scenario: Layered Video Layered Video starts at 0 seconds FTP starts at 5 seconds FTP ends at 15 seconds

13. Layered Video: BWE

14. Layered Video: Jitter

15. Scenario: FTP FTP starts at 0 seconds Layered Video starts at 5 seconds FTP ends at 15 seconds

16. FTP: BWE

17. FTP: Jitter

18. Fair Sharing? FTP Throughput LV Throughput Total Bandwidth Simultaneou s 170285.7113714.3284000 FTP First 20000092800292800 LV First 134400164800299200

19. Future Work Create a simple protocol –UDP based –ACKs –No retransmissions –Fair share –BWE calculated using ACK

20. Conclusion BWE TCP 