Hi all,
I have been thinking about this for a very long time, but couldn't formulate an
answer, so I ask my question to this community:
My application exists of 41 telosbmotes, 40 of them send 1 request (20 bytes)
at a random time in every 1-second interval to the 41sth mote who functions as
a controller.
Upon receiving a request, the controller waits 200ms and sends a reply (100
bytes) back. The succesrate of the whole application is about 89% (so of all
requests 89% are responded to with a reply)
Since the 40 requesters are in contention, the backoff-windows are expected to
have influence on this succesrate.
The initialbackoff should have no influence, since the motes allready send at a
random time and random+random=random.
The congestionbackoff however also seems to have no influence.
For each packet, I choose, a random value from [0...congestionwindow] like this:
async event void RadioBackoff.requestCongestionBackoff(message_t *msg){
if(useCustomBackoffs==TRUE) call
RadioBackoff.setCongestionBackoff((call bRand.rand16())%congestionWindow);
}
this window is changed from 5 to 200 (ticks of a 32kHz timer), but the
succesrate of the application does not change, I have no answer for this
behaviour
Anyone who could have an anwser to this, please respond, you could be a great
help to me.
thanks a lot for your time
Ruben
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