Re: [6lo] Genart telechat review of draft-ietf-6lo-fragment-recovery-12

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 18 February 2020 15:22 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Peter Yee <peter@akayla.com>, "gen-art@ietf.org" <gen-art@ietf.org>
CC: "last-call@ietf.org" <last-call@ietf.org>, "draft-ietf-6lo-fragment-recovery.all@ietf.org" <draft-ietf-6lo-fragment-recovery.all@ietf.org>, "6lo@ietf.org" <6lo@ietf.org>
Thread-Topic: Genart telechat review of draft-ietf-6lo-fragment-recovery-12
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Date: Tue, 18 Feb 2020 15:21:28 +0000
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Subject: Re: [6lo] Genart telechat review of draft-ietf-6lo-fragment-recovery-12
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Many thanks for your review Peter!

I applied all your typo fix suggestions that are not discussed below.

> Page 14, 3rd paragraph, 1st sentence: change “a same” to one of “any”, “any
> single”, or something similar.  These suggestions are based on the assumption
> that fragments from disparate datagrams are not intermingled, otherwise
> you’ll need some other description of what you want to do in order to allow
> fragments to get a few hops away.

You're right, that can be any frame. Proposed change to:
"
 When a single frequency is used by contiguous hops, the sender should insert a delay between the frames (e.g., frames carrying fragments) that are sent to the same next hop. The delay should cover multiple transmissions so as to let a frame progress a few hops and avoid hidden terminal issues.
"

> Page 18, section 7.1, inter-frame gap, 2nd sentence: change “a same” to “the
> same” in both places in the sentence.  Overall, I couldn’t quite parse this
> sentence.  “may be subject to receive while transmitting” left me guessing as
> to what exactly you wanted to convey here.  Please rewrite this sentence.

Actually I did a few lines ahead but forgot to erase those : ) There's also section 4.2.
So why nit just erase the weird sentence? We then get

"
   An implementation must control the rate at which it sends packets
   over the same path to allow the next hop to forward a packet before
   it gets the next.  In a wireless network that uses the same frequency
   along a path, more time must be inserted to avoid hidden terminal
   issues between fragments (more in Section 4.2).

   This is controlled by the following parameter:

   inter-frame gap:  Indicates the minimum amount of time between
      transmissions.  The inter-frame gap protects the propagation of
      one transmission before the next one is triggered and creates a
      duty cycle that controls the ratio of air time and memory in
      intermediate nodes that a particular datagram will use.
"



> Page 19, OptFragmentSize
Delete “of” before “the Hop Limit”.

Unsure: The Hop Limit is a field that can be compressed at the first hop and will need to be expanded later.


Many thanks for your care, Peter. I looked up and fixed other occurrences of the similar French and I hope the doc reads better now. 

If you agree with the points above I'll submit a new round asap, maybe together with another review.

All the best,

Pascal