On Fri, Jul 25, 2008 at 7:37 AM, fatima zohra <[EMAIL PROTECTED]> wrote: > > > 2008/7/25 Omprakash Gnawali <[EMAIL PROTECTED]>: >> >> On Wed, Jul 23, 2008 at 11:45 AM, fatima zohra <[EMAIL PROTECTED]> >> wrote: >> > >> > >> > 2008/7/23 Omprakash Gnawali [EMAIL PROTECTED]: >> > >> >> >> >> If you put sequence numbers in the packet, you can find out which >> >> packets were not received. For example, you sent sequence numbers 1 >> >> through 10 but and received 1,2,3,4,6,7,8,9,10 then you know exactly >> >> how many packets were not received. >> >> >> >> - om_p >> > >> > actually this isn't my scenario; >> > here is an example of my protocol mechanism: >> > we assume Node1 neighbor of nodes 2 & 3, and these two nodes are >> > neighbors >> > of source S (S will send 10 msgs for example) >> > if 3 crashes so node 1 won't receive any more packets from 3. which >> > means if >> >> You said there is one source but why is node 3 sending packets? > > because node 3 will forward what the source is sending in order to reach the > sink (let's say for example sink = node1 to make it easier) >> >> > S sends messages (from numSeq = 5 to 9) node A will never notice that >> > he >> >> Node A is mentioned here for the first time. Is it node A or 1 or 2 or 3? > > sorry, it's node 1 (which isn't a "direct" neighbor to the source S) >> >> > missed the 5 last nodes (because he doesn't communicate with S directly >> > , >> >> Nodes or packets? > > sorry again, it's "packets" >> >> > and node 3 is turned off for ever and node 2 won't help him to know what >> > node 3 lost as messages (from S or other sources) because seq number is >> > unique and different for each node (the 5th seqNum for node 2 may be the >> > 1st >> > message of the source S) >> > now i wonna to calculate packet loss rate in my network since i have a >> > set >> > of nodes who crash and will lose some sent messages. >> > am i clear now ? if yes, how to handle this situation. >> > thanks in advance. >> > best regards. >> >> Your description has some typos and could use some clarification. >> >> - om_p > > i mention in addition of what was said that: this simulation is done to > study the behavior of the network after some nodes crash. > so, first i choose some faulty nodes, then , turn them off for the rest of > simulation (they won't receive any packet in the future). in the end of my > simulation, i calculate my packet loss rate (i.e number of sent messages but > not received by faulty nodes once they are stopped). > is it clear now ?
Almost. So you have a topology that looks like this: S --> 3 --> 1 but 3 is turned off so 1 is not receiving any packets but you want to find the loss rate on the link 3-->1? - om_p _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
