[ndnSIM] Data delivery problem in NDN based Mobile Ad-hoc network (V2V scenario)

[DJEMAA Adel]

Hello,
According to my small experience with wireless ad hoc scenario in ndnSIM, I
think and I am sure that, all nodes send and receive packets (Interest and
Data) on the same NetDevice Face (in my case 256), which is logically
correct, since all nodes share the same wireless medium (for example LrWpan
Or Wifi).
For the PIT, it keeps the ID of the incoming face with the Interest
prefix Name. In our case (ad hoc scenario), the ID of the incoming face is
always the same, consequently, the sender of the interest packet couldn't
be identified through the incoming Interest Face. However, when the the
node sends back the Data Packet according to its PIT Entry (face 256), only
the concerned node (s) among its neighbors (those who have asked for this
Data packet i.e. PIT entry matches with prefix of the received Data packet)
process this data packet, otherwise it is dropped (Unsolicited Data), and
so on hop by hop until reaching the initial consumer.
This is the basics of the wireless ad hoc scenarios in ndnSIM, as I have
understood and confirmed by simulation in ndnSIM, and i Hope that will help
you.
Sincerely,

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Le sam. 31 oct. 2020 à 09:22, Sonia via ndnSIM <ndnsim at lists.cs.ucla.edu> a
écrit :

> Adding to the above:
>
> In wireless ad-hoc mode and broadcast strategy, every packet is
> broadcasted on face 257 (same for all nodes) and receives the packet on
> face 256 (same for all nodes). I am curious how the PIT works here? How can
> the PIT keep the Interest traces and face number and how can it be used
> while forwarding data back toward the consumer since there are only 2 faces
> (one for sending Interest and one for receiving it)?  I will be very
> grateful if I get some clue to solve my problem.
>
>
> Thank you for your time.
>
>
>
>
> On Fri, Oct 30, 2020 at 7:05 PM Sonia <zohanoor67 at gmail.com> wrote:
>
>> Hi Everyone,
>>
>> I have a V2V scenario consists of 9 wireless ad-hoc nodes in a grid (no
>> mobility currently) to check multihop communication. The consumer and
>> producer node are both at the two extremes of the grid kind of topology. I
>> and using the simple broadcast strategy similar to this example (
>> https://github.com/4th-ndn-hackathon/ndnSIM-Mobile-Simulation-Package/blob/8de075fb57cf16358e6c408fac166c3c33f3664c/examples/ndn-v2v-simple.cpp ).
>> All the Interest packets are delivered to the producer node via multipath
>> communication and the producer nodes respond with data packets.
>>
>> However, the problem is that all the Data packets are deemed unsolicited
>> and being dropped by the intermediate relay nodes.
>> I also increased the Interest Life time from default 2 sec to 4 and 8 sec
>> to make it sure that the PIT entries are not expired due to congestion and
>> long delay in the arrival of data packets. But it didn't work.
>>
>> Am I missing something?
>>
>> Your comments would be appreciated.
>>
>> Thank you
>>
>> Regards
>>
>> Sonia
>>
>>
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>>
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-- 
Mr DJAMA Adel
Phd student
Ecole Militaire Polytechnique
Algiers 16046, ALGERIA
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