Is there a schedule for the next 2.x release? There seem to be an aweful
lot of fixes in CVS.
Regards,
Kurt
From: Philip Levis <[EMAIL PROTECTED]>
To: Ms Mesho <[EMAIL PROTECTED]>
Cc: [email protected]
Subject: Re: [Tinyos-help] handelling of Hidden Terminal in TOSSIM
Sent: Tuesday, December 11, 2007 8:23 PM
On Dec 9, 2007, at 7:35 AM, Ms Mesho wrote:
hello,
I have noticed that in TOSSIM, if a mote is busy receiving a packet, then a
newly received packet will be discarded, however, the fisrt packet will be
received successfuly. Does this means that collissions are not possible in
TOSSIM? attached is the code from the CpmModelC.nc file which is
responsible for the receiving of a packet:
// If I'm off, I never receive the packet, but I need to keep track of
// it in case I turn on and someone else starts sending me a weaker
// packet. So I don't set receiving to 1, but I keep track of
// the signal strength.
if (!sim_mote_is_on(sim_node())) {
dbg("CpmModelC", "Lost packet from %i due to %i being off\n", source,
sim_node());
rcv->lost = 1;
}
else if (!shouldReceive(power - noiseStr)) {
rcv->lost = 1;
}
else if (receiving) {
rcv->lost = 1;
}
else {
receiving = 1;
rcv->next = outstandingReceptionHead;
outstandingReceptionHead = rcv;
evt = allocate_receive_event(endTime, rcv);
sim_queue_insert(evt);
}
This is a limitation in 2.0.2. It's been fixed in CVS. Now packets can be
lost if a strong enough packet arrives during a reception.
Phil
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