[ath9k-devel] Progress on Ath9k HT support on Adhoc mode

[Mohammed Shafi <shafi.wireless@gmail.com>]

On Thu, Feb 10, 2011 at 5:34 PM, Baldomero Coll <baldo.ath9k@gmail.com> wrote:
> Hi all,
>
> I'm also testing the patch Alex and Benoit have released for the community.
> After configuring my IBSS network, the station dump command shows this [1].
> As you can see, although the IBSS network has been created in HT mode, one
> link doesn't seem to support MCS rates.
> I would like to know if it is possible to force the MCS scheme. I don't know
> why the "NL80211_TXRATE_MCS" parameter is not defined in the bitrates.c
> (iw), or what I have to do to enable it.

I don't think we can force a particular MCS rate in the station side,
we have rate control algorithms to determine the rate.

>
> I also wonder what rate control mechanism is been used in HT mode (minstrel
> HT?), and whether such mechanism switches to non HT rates when the channel
> quality is bad.
>
> I have been using wireshark to capture data transmissions between 2 PCs
> configured in IBSS HT mode. What I see in the radiotap header is that no HT
> information is available (protocol, data rate). Do you know how the HT
> information can be added to the ratiotap header?

If you are using wireshark, you need to take the latest bleeding edge
that has MCS rate support and also you need latest wireless-testing
that contains MCS rate update to radiotap.

>
> Thanks for your help
> Baldo
>
>
> [1]
> ----------------------------------------------------------------------------------------------------------------------------------------
> sudo iw dev wlan0 station dump
> Station xx:xx:xx:xx:xx:xx (on wlan0)
> ??? inactive time:??? 8392 ms
> ??? rx bytes:??? 2476336
> ??? rx packets:??? 2149
> ??? tx bytes:??? 433552
> ??? tx packets:??? 1228
> ??? tx retries:??? 564
> ??? tx failed:??? 0
> ??? signal:? ??? -27 dBm
> ??? signal avg:??? -28 dBm
> ??? tx bitrate:??? 270.0 MBit/s MCS 14 40Mhz short GI
> Station xx:xx:xx:xx:xx:xx (on wlan0)
> ??? inactive time:??? 200 ms
> ??? rx bytes:??? 27577
> ??? rx packets:??? 434
> ??? tx bytes:??? 803
> ??? tx packets:??? 8
> ??? tx retries:??? 2
> ??? tx failed:??? 0
> ??? signal:? ??? -26 dBm
> ??? signal avg:??? -26 dBm
> ??? tx bitrate:??? 6.5 MBit/s MCS 0
> Station xx:xx:xx:xx:xx:xx (on wlan0)
> ??? inactive time:??? 96 ms
> ??? rx bytes:??? 692528
> ??? rx packets:??? 18938
> ??? tx bytes:??? 2979324
> ??? tx packets:??? 2001
> ??? tx retries:??? 3340
> ??? tx failed:??? 0
> ??? signal:? ??? -33 dBm
> ??? signal avg:??? -33 dBm
> ??? tx bitrate:??? 54.0 MBit/s
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>
>