Luigi Iannone writes:
> Hi list,
> I write you since I think you are the best to answer what happens in real
> world about 802.11b cards!
> Can anyone tell me at wich rate an ACK is sent?
> I do an example:
> If node A receives a data frame at 11Mbps, at wich rate the corresponding
> ACK is sent? 1,2 5.5 or 11 Mbps? I would say 11Mbps!
> IEEE standard is quite fuzzy on that definition!
I thought it was pretty clear. See the 1999 version of the 802.11b
(MAC) spec:
9.6 Multirate support
In order to allow the transmitting STA to calculate the contents of
the Duration/ID field, the responding STA shall transmit its Control
Response frame (either CTS or ACK) at the same rate as the immediately
previous frame in the frame exchange sequence (as defined in 9.7), if
this rate belongs to the PHY mandatory rates, or else at the highest
possible rate belonging to the PHY rates in the BSSBasicRateSet.
--
"Speed, it seems to me, provides the one genuinely modern pleasure."
-- Aldous Huxley (1894 - 1963)
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