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Re: [Int-dir] which BSM?

Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 16 April 2019 08:57 UTC

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To: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, NABIL BENAMAR <n.benamar@est.umi.ac.ma>
Cc: nabil benamar <benamar73@gmail.com>, "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "ietf@ietf.org" <ietf@ietf.org>, "its@ietf.org" <its@ietf.org>, "int-dir@ietf.org" <int-dir@ietf.org>, "draft-ietf-ipwave-ipv6-over-80211ocb.all@ietf.org" <draft-ietf-ipwave-ipv6-over-80211ocb.all@ietf.org>
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Tue, 16 Apr 2019 10:56:53 +0200
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Subject: Re: [Int-dir] which BSM?
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Sri,

Thank you very much for the email.

I would like to take this opportunity to discuss publicly a particular
topic in your email, that we already touched upon in private a few
months ago.

I purposefully keep the other ideas of you out of this email, but I do
agree with very many of them.

Le 16/04/2019 à 05:11, Sri Gundavelli (sgundave) a écrit :
[...]
> From the point of view of vehicular safety, its about exchange of
> BSM (Basic Safety Messages) between vehicles as per SAEJ735
> standard.

Sri, but there are at least three versions of BSM.

Which BSM do you mean?

Why SAE and not ISO?  Both have 'International' in their names.

Why SAE 2016 and not SAE 2009?

- SAEJ2735 version 2009 (free access),
   (google hits "SAE J2735")
- SAEJ2735 version 2016 (paid access, cca 100 USD),
   (google hits "SAE J2735")
- and the ISO/CEN/ETSI versions (free access):
   https://www.tc278.eu/cits
   https://standards.iso.org/iso/ts/19091/addgrp_c

(remark I dont mention ETSI CAM, which is ITS safety in Europe).

The three seem to be different in contents, to a few people.  Myself I
identified the first and second to be distinct.

Ideally, safety would be just one standard, right?  Something like a
combination of all BSM versions with the CAM version running on a
transport that is common to all.

A safe car would need to be able to understand all these CAM and BSM
versions; if it misses just one because of some syntax error, well,
safety would be at stake.

> [...] and for very good reason IEEE WAVE standards did not bother to
> require IPv6 transport for carrying these messages.

I doubt that reason.

Alex

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