Re: [PATCH] mac80211: mark 1, 2, 5.5 and 11Mbps as mandatory rates for 802.11b

[Johannes Berg <johannes@sipsolutions.net>]

On Thu, 2010-05-27 at 14:09 +0200, Benoit Papillault wrote:

> 802.11a = Clause 17, called OFDM
> 802.11b = Clause 15 (called DSSS) & Clause 18 (called HR/DSSS).

Are you sure? Isn't clause 15 pre-amendement?

> Clause 15 defines 1 Mbits and 2 Mbits rates, long PLCP only
> Clause 18 defines 5.5 Mbits and 11 Mbits. Optionally, short PLCP is 
> available for 2 Mbits, 5.5 Mbits and 11 Mbits. Since it's optional, such 
> short PLCP rates are probably not part of the mandatory rates.
> 
> Basic rate set must includes mandatory rates set. 

I don't think this is true.

> This is apparently 
> what every other AP do today and I indeed see no points in adding more 
> rates to the basic rate set other than what is already defined in the 
> mandatory rate set (except we cannot rely on this rule when joining an 
> existing BSS/IBSS, of course).

Sure, you can add more than say 11b mandatory rates to specifically
exclude non-11g stations from it to improve performance.

johannes