[Ndn-interest] Questions about broadcasting an interest

[Syed Hassan Ahmed]

Dear Laqin,

While looking at the question technically, I would give two aspects:

1. Either we make an assumption that without any milisecond difference, if
both packets are trying to reach same consumer: packets might collide/drop.
In that case, Consumer's PIT entry is still having an entry and it will
wait for a certain amount of time and will rebroadcast Interest as it is
unsatisfied.

2. Or, if we avoid this narrow assumption, when the first copy of Data
packet arrives, consumer matches the Data name with entries in PIT. Once it
is determined that the received packet is not unsolicited, the Data is
stored at CS (let's say) and corresponding PIT entry is deleted. On the
arrival of second copy, it is treated as unsolicited packet and thus
discarded.

Meanwhile, it depends on the application as well. If the consumer prefers
freshness as priority one, it may use Pub/Sub and wait for the fresh copy.
However, that will lead the discussion towards another debate. I hope point
1 and 2  clears the question.

Regards,
Hassan
https://sites.google.com/site/shahmedknu/



On Thu, Dec 15, 2016 at 3:35 PM Laqin Fan (lfan1) <lfan1 at memphis.edu> wrote:

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> Hello all,
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> I have questions about broadcasting an interest, if a consumer asks for
> content by broadcasting its interest over all available connectivity, any
> node hearing the interest and having the satisfied data will respond with a
> data packet, the
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> consumer will receive the first data packet? and how? what about the
> others? And if there are two data packets arriving at the consumer at the
> same time, what happens?
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> Could anyone please make me clear? I really appreciate it.
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> Thanks,
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> Laqin Fan
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> _______________________________________________
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> Ndn-interest at lists.cs.ucla.edu
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> http://www.lists.cs.ucla.edu/mailman/listinfo/ndn-interest
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> --
Best Regards, Syed Hassan Ahmed. (하산) Kyungpook National University, Daegu,
Republic of Korea. https://sites.google.com/site/shahmedknu/
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