[ndnSIM] How to obtain packets lost due to collision in WiFi

[Md Ashiqur Rahman]

Hi Junxiao,

Thanks. It appears something is acting strange in the ns3::WifiPhy
PhyRxDrop tracing.
The traced result makes sense when I have a very small topology (e.g. 3
nodes, 2 clients/consumers and 1 producer/server).

C1 < < - - > > P < < - - > > C2

However, in case of a larger topology (e.g. 25 nodes), the numbers for both
IP and NDN goes very high (higher than total transmitted packets!!). I'm
investigating this now to figure out what's happening in L1 and L2 of ns3.
If you have any idea what might be the problem, that would be really
helpful.

Best-
Ashiq

On Sun, Mar 31, 2019 at 9:23 PM Junxiao Shi <shijunxiao at email.arizona.edu>
wrote:

> Hi Ashiq
>
>
> I have followed a similar wifi setup mentioned here:
>> https://github.com/named-data-ndnSIM/ndnSIM/blob/master/examples/ndn-simple-wifi.cpp
>> However, (with my own forwarding strategy) I have already tested and
>> found that in a completely static environment with multi-hop ad-hoc network
>> (with 25 nodes) and topology set-up in such a way that path between
>> Consumer-Producer is guaranteed. Finally, with this setup, network does
>> show packets lost due to collision (under certain conditions- high Interest
>> sending rate).
>>
>
> This script is indeed using WifiNetDevice. Thus, your earlier claim of
> ndn-stack-helper forcing the use of PointToPointNetDevice is false.
>
> The problem I'm facing is that I can't obtain these collision lost packets
>> metric using ndnSIM.
>>
>
> If you have tested the method given in
> https://gist.github.com/ashiqopu/0346359297143866f1748322a9e6f125 in a
> non-ndnSIM simulation script that operates the WifiNetDevice in the same
> mode and using the same loss model, etc, I don’t see why it would not work
> with this script.
>
> Yours, Junxiao
>


-- 
Md Ashiqur Rahman
Research Assistant, Network Research Lab
Dept. of Computer Science
The University of Arizona
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