[ndnSIM] [EXT] Can we access ns3 packet tags in forwarder.cc

[Sonia]

Hi Atif,

Thank you for the explanation. Actually, I want to see the relationship
between the life of wireless links (connection) and SNR along with some
other parameters among mobile nodes. I need this information to design a
forwarding strategy.

Concluding all this, I would say that, may be you will be able to fetch the
SNR tag value using Junxiao solution but when you will extract its value,
it will be 0 in most of the cases.

I am trying to get it using one of the methods mentioned by Junxiao. I
don't think only packets with 0 SNR are sent to the upper layers. If the
SNR value is under the acceptable range (below a threshold value), the
packets are accepted and sent to the upper layer.
At the mac layer, I can see all the packets have a certain SNR value, I
didn't see any 0 value. Please correct me if I am wrong.

Please do share your experience once you done with the experiments.
I will for sure.

Thank you for the help.

On Fri, Jun 11, 2021 at 9:03 AM Atif Rehman via ndnSIM <
ndnsim at lists.cs.ucla.edu> wrote:

> Hi Sonia,
>
>
> Just out of curiosity, why do you need physical/MAC layer parameter at
> network layer. Specifically, in SNR case, do we really need that at network
> layer or is it even possible that we can fetch SNR value at network layer?
> In the later case, I might be wrong but I don’t think SNR value will be
> retained at network layer, at least in the default implementation.
>
>
> So here is the rationale with an example. Node 1 received a packet let say
> through wireless medium in this case, and at MAC layer the error in packet
> (frame) is calculated. Now MAC layer encountered that the SNR is high and
> the packet has to be fetched again from the forwarding node because there
> is no other way to reconstruct the original packet. In this case, the MAC
> layer will not forward the packet to the upper layer but rather wait for
> the forwarding node to send the packet again.
>
>
> You may ask why the MAC layer shouldn’t send the packet to the network
> layer, and for that the rationale is,  if the received packet has many
> erroneous bits then it is useless to further process the packet.
>
>
> Finally, if the packet is correctly received, it will be sent to the
> network layer and at this time there will be either no or extremely small
> SNR.
>
>
> Concluding all this, I would say that, may be you will be able to fetch
> the SNR tag value using Junxiao solution but when you will extract its
> value, it will be 0 in most of the cases.
>
>
> Please do share your experience once you done with the experiments. Thanks
>
>
> Regards
>
>
> Muhammad Atif Ur Rehman ( Ph.D. Candidate )
>
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