[Tinyos-help] Fwd: How can I make zero noise or collisions in Tossim?

[Daehee Kim]

Hi, everyone

I am using Tinyos2.0.2, Tossim for micaz for simulation.
Although simulating with very similar real environment(noises & collisions)
is very important, sometimes we need idealized environment for simulation.
That is, in that case, following assumptions should be satisified.

All sending packets should be delivered to next hop without any loss(packet
drop) irrespective of any collision,
if we set the lower noise level than signal strength for deliver packet.

That is, 100% delivery ratio should be satisfied.

Are there any way that I can disable collisions(if exist) in
Tossim(especially, in MAC layer)?

Danny

---------- Forwarded message ----------
From: Daehee Kim <dahkim77 at gmail.com>
Date: 2008/12/31
Subject: Re: [Tinyos-help] How can I make zero noise in Tossim?
To: Philip Levis <pal at cs.stanford.edu>


Hi, Phil

Thanks for your comment.

First of all,
Are you saying that each node can transmit each other without dropping
unless collisions occur (based on the environment of previous my email)?

Second,
If so, based on your comments, using jitter at each node(each node
sends packets at a slight different time with other nodes) could help
prevent collisions.
Retramissions could be one way to deal with a packet drop by collisions.

Could you fix if there are any wrong comments here ?

I apprecaite your help . Happy new year.

Danny


2008/12/31 Philip Levis <pal at cs.stanford.edu>

Collisions?
>
> Phil
>
> On Dec 30, 2008, at 9:38 PM, Daehee Kim wrote:
>
>   Hi.
>>
>> How can I make zero noise in Tossim ?
>>
>> For example, let's suppose there are three nodes, 0, 1, 2.
>>
>> I set gain value for all nodes
>>
>> gain 0   1  -55
>> gain 0   2 -55
>> gain 1   0  -55
>> gain  1  2  -55
>> gain  2  0  -55
>> gain 2  1   -55
>>
>> Also, I made noise.txt (noise file) with more than 100 values
>>
>> -100
>> -100
>> -100
>> :
>> :
>>
>> By using upper gain and noise files, all three nodes can communicate each
>> other.
>> Problem is sometimes data packet disappear among them.
>>
>> Realistic modeling is very important for simulation, but in my case, data
>> packets should not be disappeared at any case.
>> Do you know how to make idealistic environment where all data packets
>> cannot drop on the air ?
>> I would appreciate your any help.
>>
>> Thanks.
>>
>> --
>> DaeHee(Danny) Kim
>> Department of Electrical Engineering and Computer Science(EECS), Wichita
>> State University
>> Cell Phone : 1-607-321-9574
>> email-address : dxkim3 at wichita.edu, dahkim77 at gmail.com
>> _______________________________________________
>> Tinyos-help mailing list
>> Tinyos-help at millennium.berkeley.edu
>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>
>


-- 
DaeHee(Danny) Kim
Department of Electrical Engineering and Computer Science(EECS), Wichita
State University
Cell Phone : 1-607-321-9574
email-address : dxkim3 at wichita.edu, dahkim77 at gmail.com



-- 
DaeHee(Danny) Kim
Department of Electrical Engineering and Computer Science(EECS), Wichita
State University
Cell Phone : 1-607-321-9574
email-address : dxkim3 at wichita.edu, dahkim77 at gmail.com
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