linux-kernel - Re: [RFC 0/4 v2] cfg80211/mac80211: Add new interface type for OCB (Outside the Context of a BSS) mode

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Date:	Tue, 10 Jun 2014 18:43:08 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Rostislav Lisovy <lisovy@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Sojka <sojkam1@....cvut.cz>, s.sander@...dsys.de,
	jan-niklas.meier@...kswagen.de,
	Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
Subject: Re: [RFC 0/4 v2] cfg80211/mac80211: Add new interface type for OCB
 (Outside the Context of a BSS) mode

On Mon, 2014-06-09 at 16:09 +0200, Rostislav Lisovy wrote:
> On Tue, 2014-06-03 at 22:15 +0200, Johannes Berg wrote:
> > it's unclear to me how the bitrate is
> > selected, are there even different bitrates?
> 
> My understanding is that since we are using OFDM we have to support at
> least 3, 6, 12 Mb/s data rates (says 802.11-2012, Chapter 18.1.1, second
> paragraph). How to choose it when transmitting? That should probably be
> defined in some standard built on top of "802.11p" -- the European
> "Intelligent Transport System" standard ETSI EN 302 663 defines
> different channels in 5.9 Ghz band along with the "default data
> rate" (Table 2, Chapter 4.3). For example Control Channel (nr. 180) has
> data rate 6 Mb/s, while Service Channel 2 (nr. 178) has data rate 12
> Mb/s.

But that probably means then that you have to select the rate in the
join command.

johannes

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