ORBIT-USER: Setting up Topologies

[Sanjit Kaul]

Hi Reza,

We do have an algorithm to map topologies on to the ORBIT grid, using noise
injection. The algorithm has not been released to public yet.

I request you to send out the details of the topology you are interested in.
Currently we treat any topology (infrastructure/ ad-hoc) as a bunch of up or
down links (connected / dis-connected).

Given the topology I could tell you how feasible it is to map on the grid
and the caveats.

Lets not go by the word arbitrary, please :).

Regards,
Sanjit

On 8/24/07, Ivan Seskar <Seskar at winlab.rutgers.edu> wrote:
>
> Hi Reza,
>
> I will let others respond to your particular topology question, but just
> want to comment on the possibility of triggering carrier sense with
> noise injection: it is certainly possible to increase noise level to a
> point of triggering energy detection threshold (mode 1) in the cards
> (especially for the nodes that are in the vicinity of injection
> antennas).
>
> Regards,
>
> Ivan.
>
> PS; In addition to noise levels, you should also take into consideration
> transmit power and CS threshold as knobs that can be used for topology
> creation.
>
> -----Original Message-----
> From: owner-orbit-user at winlab.rutgers.edu
> [mailto:owner-orbit-user at winlab.rutgers.edu] On Behalf Of Reza Lotun
> Sent: Friday, August 24, 2007 5:16 PM
> To: orbit-user at winlab.rutgers.edu
> Subject: ORBIT-USER: Setting up Topologies
>
> Hello,
>
> I'd like to pose a general question to the list. Has anyone attempted
> (and successfully) deployed arbitrary topologies on the grid.
>
> A clarification. According to the orbit wiki, the Orbit approach to
> creating arbitrary (multi-hop) topologies is to use noise injection:
> http://www.orbit-lab.org/wiki/HowTo/UseNoise
> As far as I can see, the idea is to inject constant background white
> gaussian noise to raise the noise level, so that only more powerful
> signals can be discerned.
>
> I'm interested in simulating a real wireless network deployed in a large
> space operating in convential infrastructure mode - this means that some
> nodes will naturally be out of range of one another. Is there ever a
> danger when injecting noise that the nodes will naturally back-off since
> they sense transmission? Is anyone using orbit to test non-mesh-like
> 802.11 topologies, that is, the tree topology of
> client->access_point common to infrastructure networks?
>
> Thanks!
> Reza
>
>
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