Hi, Phil. Thanks for your clarification. But then I have a serious problem that I thought it was due to the lack of hidden/exposed node mechanism.
I'm simulating a chain network where two end motes send to a sink which is in the middle. However, there are lots of packet loss around the sink. I've already set the background noise to -200 dbm and use CPM to generate the noise model (I use RadioCountToLeds as the prototype of my model). I've been looking for the reason for more than two weeks and still couldn't find the problem. Do you have any idea what could cause the problem? Any suggestion will be appreciated. Pengjun > > On Mar 6, 2008, at 4:55 PM, Yi-Tao Wang wrote: > >> As far as I know, there's no radio interference modeling. So it >> doesn't take care of either problem. It's strange because I thought it >> took care of this in TOSSIM for tinyos 1.x, but I guess they must have >> changed the implementation. >> >> David >> >> On Thu, Mar 6, 2008 at 12:50 PM, Pengjun Pan <[EMAIL PROTECTED]> wrote: >>> >>> >>> Hi. >>> >>> Here is a short question. Does TOSSIM have any sort of machanism >>> to deal >>> with hidden and exposed node problems? Any reply or clue is >>> appreciated. >>> Thanks in advance. >>> > > Er -- it takes care of both cases. The major difference between > TOSSIM in 1.x and 2.x is 1.x uses a bit-error model with binary > interference and CSMA, while 2.x uses an SNR-based packet error model > with SINR-based interference and CSMA. So you get the hidden terminal > problem, the exposed terminal problem, strongest-first versus > stronger-second, etc. > > Phil > > Phil > _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
