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Kamal Singh, Árpád Huszák, David Ros, César Viho and Jeney Gábor

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Presentation on theme: "Kamal Singh, Árpád Huszák, David Ros, César Viho and Jeney Gábor"— Presentation transcript:

1 Kamal Singh, Árpád Huszák, David Ros, César Viho and Jeney Gábor
Congestion Control and Adaptive Retransmission for Multimedia Streaming over Wireless Networks Kamal Singh, Árpád Huszák, David Ros, César Viho and Jeney Gábor IRISA/INRIA, Rennes, France BUTE, Budapest, Hungary

2 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

3 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

4 Overview: Next Generation Wireless Network
“Hotspots” with high bandwidth Video Streaming anywhere in the cell Users of Voice, TCP, …

5 Overview: Wireless Problems in the context of Video Streaming
Problems due to the use of IP IP doesn’t support real time streaming requirements Problems due to radio conditions Scarce and time varying bandwidth Congestion, wireless losses & large delay

6 Overview: Video Streaming
constraints Delay & Jitter Bandwidth, Congestion Packet loss

7 Overview: Video Streaming …
Underflow No Playout Packet losses will cause quality distortion

8 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

9 Congestion Control for Video Flows
Motivation Variable bandwidth, delay … Congestion, packet losses How can applications adapt to the network conditions?

10 Existing Schemes Congestion control for video
TCP: Retransmissions, rate oscillations, … TFRC [Floyd 2000] Sending Rate is calculated by a TCP model Better Rate Stability TCP Friendly

11 Problems: Wireless Losses
Problem: Two types of losses in wireless Networks Packet drops due to congestion Packet drops due to bad channel conditions Wireless network IP Packets IP Queue Router Node B Wireless loss Congestion loss

12 Problems … , Inefficiency for TCP, TFRC …
Cannot distinguish between these losses. Reduce their sending rate on loss. How to distinguish Wireless losses from congestion losses? Previous Work have used Round Trip Time variations: May not be reliable ARC [O. B. Akan et al. 04]: Sending Rate (S) is calculated using w : ARC: How to calculate w ? ,

13 Wireless Loss Estimation (Background: DiffServ)
Differential dropping in the DiffServ Assured Forwarding (Green, Yellow & Red) Video applications mark their packets Increasing Congestion Drop Red packets Drop Red + Yellow packets Rarely drop Green packets I B P B P

14 Wireless Loss Estimation
Wireless Loss Estimation in DiffServ (WLED) Networks: [VTC 2006] Red packets are dropped first on congestion Wireless loss rate (w) is correlated with green loss rate If loss of yellow packets is not significant Estimate w for ARC using green loss rate

15 WLED WLED: Improves link utilization
There is no change in other properties: TCP friendliness, loss rate, rate stability But, works only with DiffServ aware applications WLED TFRC TCP

16 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

17 Adaptive retransmissions and wireless loss estimation
We improved link utilization in case of wireless losses. But, lost data still deteriorates the quality! Solution: We integrate a scheme to retransmit the lost data.

18 Adaptive retransmissions and wireless loss estimation …
Retransmission Scheme If packet has the possibility to arrive before its deadline No congestion  Enables retransmission schemes Congestion  Disable retransmission Example Scenario:

19 Adaptive retransmissions and wireless loss estimation …
Depending on: Available Bandwidth shown by Congestion Control scheme Amount of I, P and B frames in video files Retransmit either I frames I + P frames or All frames WLED scheme integrated

20 Adaptive retransmissions and wireless loss estimation : Transport protocol
DCCP (Datagram Congestion Control Protocol) Sequence numbers Feedback/ACK vectors Useful for loss detection Retransmissions done at the application layer

21 Adaptive retransmissions and wireless loss estimation : Simulation details
Dumbbell topology with 1Mbps of link with 40ms delay Packet losses simulated in the wireless link Reference Video: 360kbps “Mother and Daughter” encoded using H.264 FTP and WWW flows as background

22 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

23 Key Results 10 WWW users in background

24 Key Results … Wireless loss probability 0.1 and varying WWW users

25 Agenda Overview Congestion control for Video Flows
Adaptive retransmissions and wireless loss estimation Results Conclusion and Future Work

26 Conclusion and Future Work
Used a wireless loss estimation scheme integrated with a retransmission scheme Obtained better video quality Future Work Performance of WLED + retransmission in real network Congestion control and adaptive retransmission for MPEG4-scalable video codec (SVC)

27 Thank You !

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