Hi!
On Tue, 23 Dec 2008, Pratibha S wrote:
> Hi All,
> We are running an algorithm in TOSSIM over 200-nodes and we are experiencing
> packet losses due to improper ACKs. i.e. The sender would receive the
> packet.wasAcked() signal, but the receiver wouldnt have got the message. Is
> this a bug? Any help on this issue would be appreciated.
The CpmModelC.nc contains the following lines:
338 if (RandomUniform() < 0.001) {
339 dbg("CpmModelC,SNRLoss", "Packet was technically lost, but
TOSSIM introduces an ack false positive rate.\n");
340 if (mine->ack && signal Model.shouldAck(mine->msg)) {
341 dbg_clear("CpmModelC", " scheduling ack.\n");
342 sim_gain_schedule_ack(mine->source, sim_time() + 1, mine);
343 }
344 else { // Otherwise free the receive_message_t*
345 free_receive_message(mine);
346 }
So it's normal to receive a small number (0.1%) of false acks. :-)
--
Razvan ME
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