Re: [ipwave] draft-ietf-ipwave-ipv6-over-80211ocb-00 .11-OCB does use beacons

There is no need of beacons for IEEE 802.11 OCB, this has been debated in
the 802.11p WG years ago. 

Fygs

From: its [mailto:its-bounces@ietf.org] On Behalf Of Dr. Hans-Joachim
Fischer
Sent: Wednesday, February 01, 2017 8:19 AM
To: its@ietf.org
Subject: Re: [ipwave] draft-ietf-ipwave-ipv6-over-80211ocb-00 .11-OCB does
use beacons

That is right, but it has to be presented completely. The simple drawing
suggests that Beacons are necessary for ordinary operation.

For sure MAC management frames are supported for specific purposes.

Hans-Joachim

Am 01.02.2017 um 13:03 schrieb Jérôme Härri:

Dear all,

I do not agree and I would be happy to have the reference in the IEEE
802.11-2016 stating otherwise.

In the 802.11 standard, it clearly state the following line:

When dot11OCBActivated is true in a STA:

" The STA may send management frames of subtype Action and, if the STA
maintains a TSF Timer, subtype Timing Advertisement "

" The STA may send control frames, except those of subtype PS-Poll, CF-End,
and CF-End + CFAck "

" The STA may send data frames of subtype Data, Null, QoS Data, and QoS
Null. "

A beacon is a management frame, but not of a class Action, so it cannot be
transmitted when dot11OCBActivated is true in a STA. But I agree that it is
ambiguousnevertheless, I would then replace in the draft the mention of
what OCB can do or cant do (e.g. sending beacons) with the exact
802.11-2016 statements. This would avoid misunderstanding.

But even if it could be possible, this does not make much sense. A beacon is
transmitted on a channel you need to connect to get BSS information and also
to get the right frequency. In case of OCB (outside context of a BSS), it is
not required. But the real question is why would we need beacon, assuming
it could be transmitted?  

Best Regards,

Jérôme

-----Original Message-----
From: its [mailto:its-bounces@ietf.org] On Behalf Of Alexandre Petrescu
Sent: Wednesday 01 February 2017 11:51
To: its@ietf.org <mailto:its@ietf.org> 
Subject: [ipwave] draft-ietf-ipwave-ipv6-over-80211ocb-00 .11-OCB does use
beacons

draft-ietf-ipwave-ipv6-over-80211ocb-00 .11-OCB does use beacons

Hello IPWAVErs,

It was suggested in private that, contrary to what the draft says, the
.11-OCB does use beacons.

As such, the following line should disappear from the draft:

> 4.  Aspects introduced by the OCB mode to 802.11

> 

>    In the IEEE 802.11 OCB mode, all nodes in the wireless range can

>    directly communicate with each other without authentication/

>    association procedures.  Briefly, the IEEE 802.11 OCB mode has the

>    following properties:

> 

>    o  Wildcard BSSID (i.e., all bits are set to 1) used by each node

> 

>    o  [strike through] No beacons transmitted

Yours,

Alex

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