[e2e] A implementation question on TFRC algorithm

[Heejune AHN]

 Hi,  while implementing a streaming server, I am currently doing TFRC transport adaptation module.

After reviewing several papers of Sally Floyd and A. Zakhor,  I sill cannot implement it just because
I cannot understand one thing:

"How to calculate Round-trip time in Receiver?"
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it is written in her paper how to get Roud Trip time in Sender, measuing the feedback for same sequence num.
(now my quetion, when the Rx decide to reply it?)

I need this value because 
"Rx should report feedback to the sender at least once per round-trip time if it has received packets in that interval"
(page 3 of SIGCOM 2000  publication, Equation-based Congestion control for Unicast Application, Sally Floyd et al).
I checked it from D. Tan and A. Zakhor papers in IEEE multimedia, but the mechanism is not clear.

Maybe I can check with Sally's ns-2 simulation script, but it is too much her computer-setting dependent script.
I think it is not a big problem on their work, but I just want to know how they implemented it.

Thanks.
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