Re: [ipwave] draft-ietf-ipwave-ipv6-over-80211ocb-00 RSU term

[Alexandre Petrescu <[e-mail]>]

Hi Jérôme,

The problem with this RSU term is that we dont have a formal definition
of it, agreed across ETSI, FHWA, ISO and so many others.  Everyone uses
it in the way they need for their purposes.  So there will always be
someone to disagree with the IPv6/p Internet Draft believes an RSU to be.

Le 10/02/2017 à 12:49, Jérôme Härri a écrit :
> Hi Alex,
>
> It could actually be two different terms, depending of what we want
> to say in the draft.

In the draft the term RSU was used extensively in the IP handover
discussing involving Mobile IP.  In that discussion RSU is a Router, and
a default router at the same time.

> The RSU is no longer a pure C-ITS name, as even LTE-V2X adopted the
> LTE-UE operating in RSU mode for LTE-V2V communications (meaning you
>  do not need to be a eNB/base station to be a RSU). I would tend to
> think that the RSU is more a function/service than an actual
> technology...but as I think the debate could be complex and suggest
> to follow Michelle suggestion to keep the RSU as a 'bigger' entity,
> and if you need it, a RSR as a potential sub-set of a RSU.

I could indeed see the RSU as a bigger entity.  Something like a big box
near the road, which contains smaller boxes (Hosts, Routers)
interconnected by Ethernet.  Some manufacturers call it that way.

However, this would not solve the problem of FHWA understanding RSU to
be only a hardware interface of such a router.

> As Michelle said, a RSU is not a router by default...

I agree, RSU at ETSI is something that is not necessarily a Router.

But an RSU for the IP handover discussion in IPv6/p Internet Draft _is_
a router.  That makes it a conflict with ETSI too.

And, an RSU in the IP handover discussion _is_ a default router for a
vehicle sending IP packets through it.

We could also call it an "RSU2" for "RSU second generation" and state
that it is a Router, and a default router for vehicles.

Alex

>
> BR,
>
> Jérôme
>
> -----Original Message----- From: its [mailto:[e-mail]]
> On Behalf Of Alexandre Petrescu Sent: Friday 10 February 2017 12:37
> To: Michelle Wetterwald Cc: [e-mail] Subject: Re: [ipwave]
> draft-ietf-ipwave-ipv6-over-80211ocb-00 RSU term
>
> Hi Michelle,
>
> Thank you for the suggestion.
>
> But making RSR a component of RSU is different than making RSU a
> component of RSR, right?
>
> Despite the widespread belief that RSU would have something to do
> with IP and Internet, rarely if ever was there an RSU connected to
> Internet that forwarded IP packets - most RSUs are disconnected from
> the Internet (the supposedly 'slaves' at FHWA) and the ones that are
> connected to the Internet (supposedly the 'masters' at FHWA) are so
> only in order to be SNMP-managed remotely, but not to forward.
>
> If we know of some RSU which has this 'forwarding' flag set to 1,
> then we should talk about it, and call it a Router.
>
> The "ITS station" term is not a term at IETF.  We could re-use the
> term "ITS station", but I would like to know whether "ITS Station"
> is a Router or a Host?
>
> Yours,
>
> Alex
>
> Le 10/02/2017 à 12:18, Michelle Wetterwald a écrit :
>> Hi Alex,
>>
>> Actually, an RSU is generally more than an RSR as it is an ITS
>> station per se and may contain upper (e.g. service or even
>> application) layers. I suggest to keep the definition of RSU in
>> the text, as it is a widely used term, but clarify that an RSR
>> could be one of the components of an RSU.
>>
>> Best regards, Michelle
>>
>> 2017-02-10 11:34 GMT+01:00 Alexandre Petrescu
>> <[e-mail]
>> <mailto:[e-mail]>>:
>>
>> draft-ietf-ipwave-ipv6-over-80211ocb-00 RSU term
>>
>> Hello IPWAVErs,
>>
>> We received multiple comments about the RSU term.  The strongest
>> issue is that apparently there are conflicts between our
>> assumption of RSU to be a router and FHWA(?) thinking RSU is more
>> like an interface to a router, or something like a master-RSU
>> controlling (slave?) RSUs. Unless FHWA tells us they agree RSU is a
>> router, I will modify the following:
>>
>> Old:
>>
>> 2.  Terminology
>>
>> [...]
>>
>> RSU: Road Side Unit.
>>
>>
>> New:
>>
>> RSR: Road Side Router; an IP router equipped with, or connected
>> to, at least one interface that is 802.11 and that is an interface
>> that operates in OCB mode.
>>
>>
>> and substitute RSR for RSU throughout.
>>
>> This old 'RSU' term, now RSR, is absolutely needed in the draft
>> when discussing IP handovers and Mobile IP.
>>
>> Alex
>>
>>
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>>
>>
>>
>> -- Michelle Wetterwald [e-mail]
>> <mailto:[e-mail]>
>
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