On Wed, Nov 18, 2009 at 3:05 PM, Jouni Malinen <j@xxxxx> wrote: > On Wed, Nov 18, 2009 at 02:08:16PM -0800, Luis R. Rodriguez wrote: >> Are you aware of any regulatory rules which prohibit narrower >> channels? It just seems odd. > > I don't remember any rules that would explicitly do that, but there may > be some implicit limitations due to the slower TX rate. I don't know > whether this would hit anywhere, but at least quarter width channel with > 1 Mbps TX rate and maximum frame length might get pretty close to some > maximum TX-without-sensing limits. Though, that is less likely to be an > issue on 5 GHz band due to 6 Mbps minimum TX rate even at quarter > channels could be fast enough. There could also be some rules that state > the minimum TX rate, so there could potentially be need to change > supported rate sets and/or fragmentation threshold in some corner cases. > > Actually, even with 6/4 Mbps TX rate, the channel sensing rule in Japan > (carrier sense every 4 ms) (if that rule is still valid.. haven't > really checked), we could hit the limit with maximum frame length. Thanks for the details, we'll poke our regulatory guys just to confirm. Luis -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
