Network timeout estimation

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1 total messages Started by dondora Sat, 17 Nov 2007 09:31

#713

Author: dondora
Date: Sat, 17 Nov 2007 09:31

26 lines
2019 bytes

Hi there.

I need your help.
I'm coding a simple program which provides reliable transmission
using
udp as a homework.
I'm going to use expressions used in TCP timeout estimation.
Let me show those expressions.


EstimatedRTT = (1 - a) * EstimatedRTT + a * SampleRTT
(the recommended a = 0.125)
DevRTT = (1 - b) * DevRTT + b * |SampleRTT - EstimatedRTT|
(the recommended b = 0.25)
TimeoutInterval = EstimatedRTT + 4 * DevRTT


What I really want is TimeoutInterval. But to get it, I have to know
EstimatedRTT and DevRTT,
and the real problem is at initial time, at which time nothing has
done like sening a packet and receiving a ACK)
I don't know what EstimatedRTT is to be and what DevRTT is to be.


Can you help me to solve this problem? I'll appreciate that. I really
need your help~!~! please~!~!

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