[Ndn-interest] Delay forwarding in fw strategy
Klaus Schneider
klaus at cs.arizona.edu
Mon Jul 17 14:14:23 PDT 2017
On 07/17/2017 09:59 AM, Adhy Satya wrote:
> Hi Klaus,
>
> I'm working on a wireless scenario (my apologies! I forgot to clarify
> this in my first email).
> - Point 1 (Send the Data to a different interface): nodes will broadcast
> packets on the same interface (WiFi);
Maybe you can use a broadcast/multicast face instead?
> - Point 2 (Delay the Data packet): since wireless is broadcast in
> nature, all nodes in the communication range will listen to
> Interest/Data transmissions and will rebroadcast roughly at the same
> time. Delayed retransmissions help to avoid collisions in the wireless
> channel.
This sounds like it may be better implemented at a lower layer, since
the desired behavior is specific to a certain (wireless) link.
Did you have a look at the NDNLP protocol?
https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2
Best regards,
Klaus
This technique was used in the NDN Car2Car
> <https://github.com/cawka/ndnSIM-nom-rapid-car2car/blob/master/extensions/ndn-fw-v2v.cc>
> work (ndnSIM) and other works, but I think they all used simulators. In
> the Car2Car, the delay was performed in a customized face, not in the
> strategy.
>
>
>
>
>
> On Fri, Jul 14, 2017 at 11:19 AM, Klaus Schneider <klaus at cs.arizona.edu
> <mailto:klaus at cs.arizona.edu>> wrote:
>
>
>
> On 07/13/2017 08:47 PM, Adhy Satya wrote:
>
> Hi Junxiao,
>
> Thank you for your answer. I missed that detail on the NFD
> developer guide (that the strategy controls only Interests packets).
> In my case, each data packet is associated with a unique
> Interest; therefore, by adopting an Interest digest the strategy
> should be able to control Data packets.
>
>
> You can use the function beforeSatisfyInterest() that is called
> whenever a Data packet arrives. Thus you can perform certain actions
> (like storing RTT measurements) on each Data packet. You just cannot:
>
> 1. Send the Data to a different interface. Or
>
> 2. Delay the Data packet.
>
> Was this feature ever implemented? (it shows as 0% done in issue
> 3333 <https://redmine.named-data.net/issues/3333
> <https://redmine.named-data.net/issues/3333>>). Are there any
> sample implementations?
>
>
> One could design the strategy so that beforeSatisfyInterest() is a
> mandatory step in the pipeline between "incoming Data" and "outgoing
> Data". This would extend the functionality and probably support what
> you want.
>
> However, the strategy was not designed that way (presumably) because
> nobody saw a use case.
>
> For (1): why would anyone want to send the Data to a different face?
> It would be dropped there as "unsolicited".
>
> For (2): why do you want to delay the Data inside the strategy?
> Maybe there's an easier solution for you like
>
> - delaying Data/Interests at consumer or producer. Or
> - delaying the Interests inside the strategy.
>
>
> Best regards,
> Klaus
>
>
>
>
>
>
> Thanks
>
>
>
>
>
> On Thu, Jul 13, 2017 at 4:45 PM, Junxiao Shi
> <shijunxiao at email.arizona.edu
> <mailto:shijunxiao at email.arizona.edu>
> <mailto:shijunxiao at email.arizona.edu
> <mailto:shijunxiao at email.arizona.edu>>> wrote:
>
> Hi Adhy
>
> The method to delay Interest forwarding is explained in
> this answer:
> http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html>
>
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003952.html>>
> Forwarding strategy does not have control over Data
> forwarding nor
> can it delay Data forwarding. The reason is explained in this
> answer:
> http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html>
>
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html
> <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003961.html>>
> Also, you need to ensure your Interest name (including any
> “extra
> name components”) is a prefix of the Data name. Otherwise,
> Data does
> not satisfy Interest and will not be received by the consumer.
>
> Yours, Junxiao
>
> On Jul 13, 2017, at 11:43 AM, Adhy Satya
> <adhysatya820 at gmail.com <mailto:adhysatya820 at gmail.com>
> <mailto:adhysatya820 at gmail.com
> <mailto:adhysatya820 at gmail.com>>> wrote:
>
> Hi,
>
> My consumer and producer applications send Interest and
> Data
> packets with extra name components. I wrote a custom
> forwarding
> strategy that reads this name components and forward
> packets with
> certain delay.
>
> I'm using NFD 0.5.0 and ndn-cxx 0.5.0. I'm unsure where to
> implement the timer. It seems that if I implement a
> timer to call
> "this->sendInterest()" it will block the forwarder for
> a certain
> amount of time.
>
> Can you assist me on this issue please?
>
> Thank you
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