[rmcat] Roman Danyliw's Discuss on draft-ietf-rmcat-wireless-tests-09: (with DISCUSS and COMMENT)

Roman Danyliw via Datatracker <noreply@ietf.org> Wed, 04 March 2020 15:16 UTC

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Subject: [rmcat] Roman Danyliw's Discuss on draft-ietf-rmcat-wireless-tests-09: (with DISCUSS and COMMENT)
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Roman Danyliw has entered the following ballot position for
draft-ietf-rmcat-wireless-tests-09: Discuss

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DISCUSS:
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Please let me know if I've misunderstood the test execution protocol
incorrectly:

Section 6.  Per the paragraph “The evaluation of the test cases are intended to
carry out in a controlled lab environment … It is important to take appropriate
caution to avoid leaking non-responsive traffic from unproven congestion
avoidance techniques onto the open Internet”, this is good guidance in general
case.  However, in the case of this document how applicable is it?  Didn’t
Section 3 (“We, therefore, recommend that a cellular network simulator is used
for the test cases defined in this document …” and practically establish it
can’t be done without simulation with the scenario of the underground mine) and
Section 4 (“We recommend to carry out the test cases as defined in this
document using a simulator, such as [NS-2] or [NS-3]).   If all the testing is
supposed to be in a simulator how is it leaking out onto the internet?  As far
as I can tell, this helpful text is common in RMCAT document, but in this case
could it please be tailored for the proposed testing regime.

Perhaps something on the order adding text on the order of “Given the
difficulty of deterministic wireless testing, it is RECOMMENDED and expected
that the tests described in this document would be done via simulation. 
However, <in the case of not doing it that way> <leave the existing language>”


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COMMENT:
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** Section 3.1.  Per “In this test case, each of the user/UE in the media
session is an RMCAT compliant endpoint”, what is a “RMCAT compliant endpoint”? 
Could this be cited please.

** Section 3.1.  Per “At the beginning of the simulation, there should be
enough time to warm-up the network”, intuitively the notion of “warm[ing]-up
the network” makes sense.  However, is more precision required to side-by-side
analysis of test runs of when the network is “warm enough”?

** Section 4.  Per “Statistics collected from enterprise Wi-Fi networks show
that the two dominant physical modes are 802.11n and 802.11ac, accounting for
41% and 58% of connected devices”, it is would be valuable to cite this value
and provide a timestamp.  This distribution will certainly change as this
document ages.

** Section 4.  Per “Unless otherwise mentioned, test cases in this section are
described using the underlying PHY- and MAC-layer parameters based on the IEEE
802.11n Standard.”, this focus on only 802.11n is surprising, since the next
sentence establishes that 802.11.n is already less than half (41%) of the Wi-Fi
traffic (and likely will continue to shrink).  Why not ac?

** There appear to be some differences between the description of the Cellular
(Section 3) and Wifi (Section 4) test. -- Section 4.1.2 and 4.2.2 are called
“Test setup”, but Section 3.1.2 and 3.2.2. are called “Simulation setup”.  Was
this intentional?

-- Section 4.*.4 discusses the expected test behavior, but Section 3.* does
not?  Was that explicit?