| Techreport |
| Type of Publication |
| Extending Equation-based Congestion Control to Multicast
Applications |
| Title |
|
Mark Handley
|
| Authors |
| Technical Report TR-2001-13, Department for Mathematics and Computer Science,
University of Mannheim, June 2001 |
| Published in |
| In this paper we introduce TFMCC, an
equation-based multicast congestion control mechanism that
extends the TCP-friendly TFRC protocol from the unicast to the
multicast domain. The key challenges in the design of TFMCC lie
in scalable round-trip time measurements, appropriate feedback
suppression, and in ensuring that feedback delays in the control
loop do not adversely affect fairness towards competing flows. A
major contribution is the feedback mechanism, the key component
of end-to-end multicast congestion control schemes. We improve
upon the well-known approach of using exponentially weighted
random timers by biasing feedback in favor of low-rate receivers
while still preventing a response implosion. We evaluate the
design using simulation, and demonstrate that TFMCC is both
TCP-friendly and scales well to multicast groups with thousands
of receivers. We also investigate TFMCC's weaknesses and scaling
limits to provide guidance as to application domains for which it
is well suited. |
| Abstract |
|
congestion control
multicast
single-rate
TCP-friendliness
feedback suppression
|
| Keywords |
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