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Better-Behaved Better- Performing Multimedia Networking Jae Chung and Mark Claypool (Avanish Tripathi) Computer Science Department Worcester Polytechnic.

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Presentation on theme: "Better-Behaved Better- Performing Multimedia Networking Jae Chung and Mark Claypool (Avanish Tripathi) Computer Science Department Worcester Polytechnic."— Presentation transcript:

1 Better-Behaved Better- Performing Multimedia Networking Jae Chung and Mark Claypool (Avanish Tripathi) Computer Science Department Worcester Polytechnic Institute

2 Outline Motivation Approach Experimental Setup Results Conclusion Future Work

3 Motivation The Internet is predominantly designed for TCP traffic.  Best Effort ( no timing constraints)  Reliable delivery TCP is unsuitable for Multimedia applications …Multimedia applications use UDP

4 Illustrative Example

5 Approach But, UDP is unresponsive to congestion... Model the TCP congestion control strategy for UDP flows Exponential decrease in data rate when congestion is encountered Linear increase in data rate in the absence of congestion [ Jacobson et al. 1988]

6 Issues Multimedia Scaling to enable the variations in the data rate Congestion detection mechanism when to reduce the data rate

7 Directly associate transmission rates to scale values MPEG_APP : based on MPEG-I encoding [Walpole et al. 1997] Multimedia Scaling

8 Congestion Detection Frame loss is the indicator for congestion. A frame is assumed lost when : the receiver gets a frame whose sequence number is greater than the expected sequence number. the receiver does not get any frame within a timeout interval.

9 Operation In case of congestion reduce scale value by half ( exponential decrease) In the absence of congestion increase the scale value by one (linear increase)

10 Experiments NS - WAN Simulator developed at University of California, Berkeley

11 Simulation Time ( s) 5 TCP Flows MM UDP Flow MPEG UDP Flow 52515 MM UDP Flow MPEG UDP Flow TCP Flow

12 Simulation Results

13

14

15 Conclusions “TCP-like” multimedia protocol built upon UDP  Responsive to congestion  Better Multimedia Quality Quantitative comparison of TCP, UDP and responsive UDP Implementation in NS

16 Future Work Content based multimedia scaling Experiments with other media formats Evaluation of perceptual quality by user studies Quantitative analysis of data loss ( ratio of packets sent and packets lost) “TCP Friendly” Evaluation

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