Re: [Tinyos-help] Does TOSSIM deal with hidden and exposed node problem?
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. Pengjun ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
Re: [Tinyos-help] Does TOSSIM deal with hidden and exposed node problem?
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
Re: [Tinyos-help] Does TOSSIM deal with hidden and exposed node problem?
How do I replicate this in TOSSIM? Because I've set up a hidden terminal topology using 3 nodes and the middle node receives both messages. On Thu, Mar 6, 2008 at 6:20 PM, Philip Levis [EMAIL PROTECTED] wrote: 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
Re: [Tinyos-help] Does TOSSIM deal with hidden and exposed node problem?
Hi, David. How do you set up such a hidden terminal topology in TOSSIM? Is it a command line option when executing make command or it should be specified in the python file? Pengjun How do I replicate this in TOSSIM? Because I've set up a hidden terminal topology using 3 nodes and the middle node receives both messages. On Thu, Mar 6, 2008 at 6:20 PM, Philip Levis [EMAIL PROTECTED] wrote: 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
Re: [Tinyos-help] Does TOSSIM deal with hidden and exposed node problem?
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
