[Tinyos-help] Detecting collisions over asymmetric links

[Anthony Smee]

Hi there

Sorry for the confusion, I am looking for advise on:

a - How does one detect a collision
b - How does one detect an asymmetric link

I have written code to detect asymmetric links based around multiple timers that are running at different intervals waiting on packets to be received after a broadcast, if it does not hear any packets back it will eventually conclude that it has an asymmetric link.

However, the node may not hear back from a broadcast due to collisions.

I am looking for advise on how you detect a collision?

Thanks

Anthony


Date: Mon, 4 Aug 2008 19:53:39 -0700
From: cire831 at gmail.com
To: ant_smee at hotmail.com
Subject: Re: [Tinyos-help] Detecting collisions over asymmetric links
CC: tinyos-help at millennium.berkeley.edu

what exactly do you mean by collisions on an asymmetric link?

On Mon, Aug 4, 2008 at 1:09 PM, Anthony Smee <ant_smee at hotmail.com> wrote:






Hi there

Does anyone have any advise on the best way to detect a collision over an asymmetric link. I have managed to put something together, under TOSSIM, using multiple timers to try and detect asymmetric links. However it does not really deal with collisions, and so the code works, and then sometimes it does not which I put down to collisions I would prefer to be able to detect this and deal with it accordingly.


Also along the same lines, does anyone have any advise on getting a consistent environment in TOSSIM? I have set the gain to be equal for every node's relation, and also a consistent noise but still my results differ with each run.


Thanks

Anthony

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