On Mon, Apr 20, 2009 at 10:14 AM, Rémi Villé <[email protected]> wrote: > Hi, > > I used TOSSIM to see how reacts TinyOS Collection (CTP) according to the > gain (thanks to MultihopOscilloscopeApp example). > > First, after some difficulties I understood that gain and noise are negative > values (between 0 and -100), and more the value is near than -100 more it's > powerful (-100 for noise or 0 for gain prevent any communication). > > Second, I think that when gain becomes smaller than noise there's no > possible communication. > > Am I wrong ? > > To have not any noise I choose -100 in every case. > > So I make some simulations to see the data path according to different gain > values, with very good gain and very poor ones, but with a link between each > nodes. > And the data path don't change (the data go directly to the sink) ! > > To see data paths I use "event bool Intercept.forward(message_t* msg, void* > payload, uint8_t len) " to add the intercepter node id in msg (and return > TRUE in each case). > In MultihopOscilloscopeAppC "MultihopOscilloscopeAppC.Intercept -> > Collector.Intercept[AM_OSCILLOSCOPE];". > The sink node print the path. > > So I wonder If Collection takes care of the gain, or only construct a tree > with mote that can communicate with each other, > so the routing gradient takes only care of paths with less hop than > possible, and not faster ones ? > > I really don't understand, maybe I must search an energy reason... I will > try other topologies...
Collection, like other routing protocols, determines the best next hop to the destination from a list of candidate next hops. Collection does not take care of gain - gain is used to define the link between two nodes. - om_p _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
