Last Call Review of draft-ietf-rmcat-nada-11
review-ietf-rmcat-nada-11-genart-lc-halpern-2019-08-05-00

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Document: draft-ietf-rmcat-nada-11
Reviewer: Joel Halpern
Review Date: 2019-08-05
IETF LC End Date: 2019-08-12
IESG Telechat date: Not scheduled for a telechat

Summary: This document is almost ready for publication as an Experimental RFC

Major issues:
   It is unclear reading this RFC how the observation information is to be
   communicated from the receiver to the sender.  At first I thought it was to
   use the RTP Receiver report.  But there is no description of how to map the
   fields to that report.   Then section 5.3 describes requirements for a
   reporting mechanism, but does not seem to actually define one.   Thus, I am
   left unclear how independent interoperable implementations of this draft can
   be created.

Minor issues:
    The document has 7 front page authors.   The shepherd writeup does not
    comment on this. The shepherd writeup seems quite sparse.  II would have
    expected some reference to the experimental behavior described in the draft.

    This comment is just to confirm that I am reading the draft correctly.  It
    looks like when the observed delay cross the delay boundary, the reporting
    system reports using a smaller delay than actually approved (slightly more
    than 1/9th of observed delay when delay is 3*QTH).  I presume this is
    intentional, and that the various analysis pointed to evaluate the risks of
    such false reporting?

    Is it intentional in section 4.3 in the pseudo-code that the rate clipping
    (to keep the rate between RMIN and RMAX) is only applied to the gradual
    rate change, not to the accelerated rate change?  The later code says that
    the clipping is always applied, which is what I would expect.

Nits/editorial comments: