[ndnSIM] Data delivery problem in NDN based Mobile Ad-hoc network (V2V scenario)
zohanoor67 at gmail.com
Sun Nov 1 23:06:54 PST 2020
Thank you for your informative response. You are right. It was my mistake,
I debug my simulation again and there is only one interface 256 for
receiving and transmitting packets. However, the consumer node in my
simulation does not receive the data packets if the producer is not
directly in the wireless range of the consumer node. The data are
considered unsolicited by the relay nodes. For your information, I have
modified the ndn-simple-wifi example to make this ad-hoc scenario. I have
changed the wifi mode to ad-hoc and increased the number of nodes to 9.
Is there anything I am missing? Is there any special NetDevice for
vehicular communication? For a single chunk of data, consumer generates one
interest that receives multiple time to the producer and the producer
respond multiple time accordingly but none of the data reaches the consumer.
node 0 consumer node 2
node 3 node 4 node 5
node 6 producer node 8
When I made node 0 as the producer, almost all the data packets delivered.
After, I make node 5 as the producer node, only 2 data packets delivered
against 20 Interest packets.
On Sat, Oct 31, 2020 at 8:31 PM DJEMAA Adel <a_djemaa at esi.dz> wrote:
> 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
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Garanti
> sans virus. www.avast.com
> 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
>>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free.
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> Mr DJAMA Adel
> Phd student
> Ecole Militaire Polytechnique
> Algiers 16046, ALGERIA
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