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

Alissa Cooper <> Wed, 19 February 2020 20:40 UTC

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From: Alissa Cooper <>
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Date: Wed, 19 Feb 2020 15:40:16 -0500
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To: "Pascal Thubert (pthubert)" <>, Peter Yee <>
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Subject: Re: [6lo] [Gen-art] Genart telechat review of draft-ietf-6lo-fragment-recovery-12
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Peter, thanks for your review. Pascal, thanks for your response. I entered a No Objection ballot.


> On Feb 18, 2020, at 10:21 AM, Pascal Thubert (pthubert) <> wrote:
> 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
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