Subject: [lp-wan] comments on draft-petrov-lpwan-ipv6-schc-over-lorawan-02

From: <[email-masked]>
Date: Sat, 14 Jul 2018 01:03:02 +0000

Bear authors,

Thanks for submitting draft-petrov-lpwan-ipv6-schc-over-lorawan-02, it's a useful contribution to implementers.
I have one comment and a few nits.

Comments:
- Fig 6 is incompatible with the SCHC draft. Indeed, we sate that the payload MUST be of the exact weird size that makes the fragment a multiple of L2 Words (I.e. bytes). Therefore, the size of the payload in Fig 6 must be X bytes + 2 bits, and no padding must be used. Similarly, the payload in Fig 7 is some number of bytes and bits, and padding may be 0, 2, 4 or 6 bits.

Nits :
- You seem to have gone through the list of parameters/options that Appendix D in the SCHC draft provides. However, this document could explicitly state somewhere that, for this document, an L2 Word is a byte, and padding bits are 0's (the latter incidentally appears in some figures, but not all).
- Fig 4 could be improved by saying Padding : 0 or 3 bits. Indeed, it's either 3 (the Bitmap was not shortened) or 0 (the Bitmap was shortened). Same thing for Figure 5.
- your text uses the term "ACK fragment". In recent versions of the SCHC draft, we no longer call the ACK "fragments", but "SCHC ACKs" instead.
- "eventual" : a French faux-ami. You mean "potential".

Looking forward to working further with you all,
Best regards,

Dominique

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