Re: [ipwave] Feedback from ITU-R CITS about IP and cellular for vehicular networks

[Alexandre Petrescu <[e-mail]>]

Le 05/10/2021 à 17:24, Dick Roy a écrit :
> -----Original Message----- From: its [mailto:[e-mail]]
> On Behalf Of Alexandre Petrescu Sent: Tuesday, October 5, 2021 5:29
> AM To: [e-mail]; [e-mail] Subject: Re: [ipwave]
> Feedback from ITU-R CITS about IP and cellular for vehicular
> networks
> 
> [...]
> 
>> There might be other problems with IP on C-V2X on a car-to-car
> 
>> without base station scenario.
> 
>> 
> 
>> */[RR] Like there being NO layer-2 addressing in C-V2X …  ONLy
> 
>> broadcasts! Just imagine how efficient that will be! /*
> 
> It sounds as if one has read a specification of C-V2X and has seen 
> the
> 
> C-V2X headers and in these headers there are no addresses.
> 
> */[RR] yup! C-V2X can ONLy be used for broadcasts in the US! When
> one is being manipulated for corporate aggrandizement, it is wise to
> do one’s homework. Yes it involves effort, effort which many are 
> unfortunately not willing to expend so I guess they’ll just have to 
> live with the consequences, consequences which I am positive they
> are going to deeply regret having to suffer through. They can not
> say that they haven’t been warned however, so it’s really their own 
> fault. /*
> 
> Can I see that?
> 
> */[RR] Sure can.  Just read the 3GPP LTE Rel14 (cf. mode 3 and mode
> 4 PC5 sidelink) specs and J3161 (which is not available to you yet
> of course) and you will see there are NO layer-2 addresses.  There is
> a 24-bit control field in the MAC header which is useless without an
>  eNodeB so there have been attempts to use it for other purposes.
> The Chinese use it to encode a hash of the ITS-AID (brilliant!) and
> the US just populates it with random numbers (which have to tumble
> with all the other immutable fields for pseudonymity!). It gets even 
> better … ^(((((/*
> 
> *//*

Richard,

You are helping in a sense, but still it is confusing.

Let me be straight.

If you think that C-V2X is an invisible document to me (J3161) then of
course I can not even dream to work on it.  Note that it might be that I
might ask a kind soul to show it to me for standardisation purposes; if
the request is strong enough it might even become public officially.
But that is speculation.

Still, if C-V2X J3161 is invisible then one can try to tell back to ITU
that their strong invitation to develop a document for IPv6 for C-V2X
can not succeed because of that J3161 unavailability.  And we end there.

If on another hand you think that 3GPP LTE Rel14 cf. mode 3 and mode 4
can be equivalent to 'C-V2X' then we can work on that, because the specs
are available openly.  Here we might struggle with other issues
that I will raise when necessary, but it might be workable.

So, the basic question is this: what is 'C-V2X'?  Is 'C-V2X' a set of
3GPP documents or a set of SAE documents?

Alex

> 
> */RR /*
> 
> Alex
> 
>> 
> 
>> Alex
> 
>> 
> 
>> Le 04/10/2021 à 11:52, Alexandre Petrescu a écrit :
> 
>> 
> 
>>> Hi, IPWAVErs,
> 
>> 
> 
>>> 
> 
>> 
> 
>>> I gave a brief presentation of the IPWAVE WG, RFC8691 and
> 
>>> Vehicular
> 
>> 
> 
>>> Networks I-D to the ITU CITS 'Collaboration on ITS Standards', 
>>> in
> 
>> 
> 
>>> September, 2021.
> 
>> 
> 
>>> 
> 
>> 
> 
>>> This is the feedback I received:
> 
>> 
> 
>>> 
> 
>> 
> 
>>> Bring the cellular kind of work, like  IP-over-cellular, in
> 
>> 
> 
>>> IPWAVE WG.  This request is so  because:
> 
>> 
> 
>>> - because China efforts on cellular and because
> 
>> 
> 
>>> USA FCC  regulation changes at 5.9GHz to include
> 
>> 
> 
>>> C-V2X  ('C'==cellular).
> 
>> 
> 
>>> - because at ETSI it  is thought that it is easy
> 
>> 
> 
>>> to do IP  over any access layer, be it 802.11-OCB
> 
>> 
> 
>>> or a  cellular kind of link layer.
> 
>> 
> 
>>> 
> 
>> 
> 
>>> What do you think?
> 
>> 
> 
>>> 
> 
>> 
> 
>>> Alex
> 
>> 
> 
>>> 
> 
>> 
> 
>>> _______________________________________________
> 
>> 
> 
>>> its mailing list
> 
>> 
> 
>>> [e-mail]
> 
>> 
> 
>>> https://www.ietf.org/mailman/listinfo/its
> 
>> 
> 
>> _______________________________________________
> 
>> 
> 
>> its mailing list
> 
>> 
> 
>> [e-mail]
> 
>> 
> 
>> https://www.ietf.org/mailman/listinfo/its
> 
>> 
> 
> _______________________________________________
> 
> its mailing list
> 
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> 
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