Le 27/05/2010 10:08, Johannes Berg a écrit :
On Thu, 2010-05-27 at 09:45 +0900, Bruno Randolf wrote:
IEEE802.11-2007 clause 18.2.3.3 (p640) states that 1, 2, 5.5& 11 Mbits are
mandatory rates for what they call High Rate direct sequence spread spectrum
(HR/DSSS) PHY (with long PLCP).
You're confused. Clause 18 is 11g, we knew that those were mandatory
there, see the code you're modifying.
Clause 15 is 11b, and it shouldn't change.
So NACK.
johannes
I just dig through the various standards and besides there are still
some grey areas in my mind (like what is HR/DSSS/PBCC mentioned in
Clause 18 or DSSS-OFDM as specified in Clause 19, hopefully both are
optional), we have :
802.11a = Clause 17, called OFDM
802.11b = Clause 15 (called DSSS) & Clause 18 (called HR/DSSS).
802.11g = Clause 19, called ERP with lots of variants : ERP-DSSS/CCK,
ERP-OFDM, ERP-PBCC
802.11n = Clause 20, called HT for High Throughput, which also includes
DUP-OFDM
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. 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).
Does the patch you posted is intended to create a 802.11b only or
802.11bg AP/IBSS with a 802.11g hardware for instance?
Regards,
Benoit
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