Scalable Performance Signalling and Congestion Avoidance

1. Front Matter

   Pages i-xi

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2. Introduction

   • Michael Welzl

   Pages 1-5

3. Related Work

   • Michael Welzl

   Pages 7-44

4. PTP: A Framework for Explicit Performance Signalling

   • Michael Welzl

   Pages 45-90

5. Congestion Avoidance with Distributed Proportional Control

   • Michael Welzl

   Pages 91-139

6. Conclusion

   • Michael Welzl

   Pages 141-148

7. Back Matter

   Pages 147-167

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This book answers a question which came about while the author was work­ ing on his diploma thesis [1]: would it be better to ask for the available band­ width instead of probing the network (like TCP does)? The diploma thesis was concerned with long-distance musical interaction ("NetMusic"). This is a very peculiar application: only a small amount of bandwidth may be necessary, but timely delivery and reduced loss are very important. Back then, these require­ ments led to a thorough investigation of existing telecommunication network mechanisms, but a satisfactory answer to the question could not be found. Simply put, the answer is "yes" - this work describes a mechanism which indeed enables an application to "ask for the available bandwidth". This obvi­ ously does not only concern online musical collaboration any longer. Among others, the mechanism yields the following advantages over existing alterna­ tives: • good throughput while maintaining close to zero loss and a small bottleneck queue length • usefulness for streaming media applications due to a very smooth rate • feasibility for satellite and wireless links • high scalability Additionally, a reusable framework for future applications that need to "ask the network" for certain performance data was developed.

• ATM
• CAD
• Internet
• Network congestion avoidance
• Performance
• QoS
• Quality of Service
• Quality of Service (QoS)
• evaluation
• simulation

• University of Innsbruck, Austria

  Michael Welzl

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