Synchronization and default capabilities between ahdemo nodes

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Hi everyone,

I'd like to understand better how synchronization happens in a mesh network
with nodes using madwifi ahdemo mode.

According to this
website<http://madwifi-project.org/wiki/UserDocs/AhdemoInterface>,
there is no beacons transmission in ahdemo.  However, beacons are important
to distribute information about the capabilities of every node and also to
get timestamps. I guess madwifi assigns common default values for the
parameters that should be included in information elements of the beacons
frame body regarding the capabilities of the nodes. I'm specially
interested on the value assigned in the following fields:
- Short Preamble (Capability Information Element)
- Short Slottime (Capability Information Element)
- Use Protection (ERP Information Element)
- Barker_Preamble_mode (ERP Information Element)
Furthermore, I'd like to know how nodes synchronize the beginning of their
slottimes in the absence of timestamps.

Some of the nodes configured in ahdemo have also a virtual access point
configured on the same interface. The AP is sending its corresponding
beacons, and so the mesh neighbors of the node are receiving them. The
question is, what these ahdemo nodes do with the beacons from the AP? Do
they process them or discard them? Could they use it for receiving the
information I was mentioning above?

Thank you very much in advance,

Regards

carlos

--
Note that I am using a new email account [email protected], and
that the former email address [email protected] will be disappearing soon.
Thanks for changing this in your contact list.

Carlos Rey-Moreno
Research Assistant
Office 1.28
Department of Computer Science
University of the Western Cape
Private Bag X17 - Bellville, 7535
Cape Town - South Africa

Tel: +27 (0) 21 959 2562
Cel: +27 (0) 76 986 3633

Skype: carlos.reymoreno
Twitter: Creym

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<div dir=3D"ltr"><div><div><div><div>Hi everyone,<br><br>I&#39;d like to un=
derstand better how synchronization happens in a mesh network with nodes us=
ing madwifi ahdemo mode. <br><br>According to <a href=3D"http://madwifi-pro=
ject.org/wiki/UserDocs/AhdemoInterface">this website</a>, there is no beaco=
ns transmission in ahdemo.=A0 However, beacons are important to distribute =
information about the capabilities of every node and also to get timestamps=
. I guess madwifi assigns common default values for the parameters that sho=
uld be included in information elements of the beacons frame body regarding=
 the capabilities of the nodes. I&#39;m specially interested on the value a=
ssigned in the following fields:<br>
</div>- Short Preamble (Capability Information Element)<br></div>- Short Sl=
ottime (Capability Information Element)<br></div>- Use Protection (ERP Info=
rmation Element)<br></div>- Barker_Preamble_mode  (ERP Information Element)=
<div>
<div><div><div>Furthermore, I&#39;d like to know how nodes synchronize the =
beginning of their slottimes in the absence of timestamps. <br><br></div><d=
iv>Some of the nodes configured in ahdemo have also a virtual access point =
configured on the same interface. The AP is sending its corresponding beaco=
ns, and so the mesh neighbors of the node are receiving them. The question =
is, what these ahdemo nodes do with the beacons from the AP? Do they proces=
s them or discard them? Could they use it for receiving the information I w=
as mentioning above?<br>
</div><div><br>Thank you very much in advance,<br><br>Regards<br><br>carlos=
<br><br>--<br>Note that I am using a new email account <a href=3D"mailto:ca=
[email protected]">[email protected]</a>, and that the form=
er email address <a href=3D"mailto:[email protected]">[email protected]</a> will be=
 disappearing soon. Thanks for changing this in your contact list.<br>
<br>Carlos Rey-Moreno<br>Research Assistant<br>Office 1.28<br>Department of=
 Computer Science<br>University of the Western Cape<br>Private Bag X17 - Be=
llville, 7535<br>Cape Town - South Africa<br><br>Tel: +27 (0) 21 959 2562<b=
r>
Cel: +27 (0) 76 986 3633<br><br>Skype: carlos.reymoreno<br>Twitter: Creym<b=
r></div></div></div></div></div>

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