No subject


Wed Jan 26 21:46:16 EST 2011


So, my understanding is that an HT BSS should always be run with WMM suppor=
t enabled.

-Sohail
--- On Mon, 31/1/11, Jouni Malinen <j at w1.fi> wrote:

From: Jouni Malinen <j at w1.fi>
Subject: Re: Any idea why hostapd won't send wmm_param elements?
To: hostap at lists.shmoo.com
Date: Monday, 31 January, 2011, 8:37 PM

On Mon, Jan 31, 2011 at 06:51:03AM -0800, Sam Leffler wrote:
> While the h/w is clearly capable of sending at MCS w/o WMM the spec
> says 11n =3D>'s WMM so I think the 11n config knob should auto-enable
> WMM.=A0 The only reason I can think to not enable WMM is for testing.

I'm not aware of any standard or specification having a strict rule on
the WWM/QoS being enabled (apart from some test plans), but sure, that
would be the normal use case for IEEE 802.11n. I'm thinking of modifying
hostapd to enable WMM (with default EDCA parameters) whenever
ieee80211n=3D1 is used in the configuration without explicitly specifying
wmm_enabled parameter. In other words, that would maintain the option of
disabling WMM (wmm_enabled=3D0) while hopefully removing most of the cases
where the HT AP is left with WMM/QoS disabled accidentally.

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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Though, there is no explicit mention, some te=
xt can be quoted from 802.11 standard to draw inference in this regard.<br>=
<br style=3D"font-weight: bold;"><span style=3D"font-weight: bold;">#1: An =
HT STA is also a QoS STA.</span><br>From Section 5.2.9 in IEEE P802.11n/D9.=
0, March 2009<br><br style=3D"font-weight: bold;"><span style=3D"font-weigh=
t: bold;">#2: Support for the reception of an A-MSDU is mandatory for an HT=
 STA. The A-MSDU is always carried in a QoS data MPDU with Ack Policy set t=
o Normal Ack.</span><br>From Section 9.7c in IEEE P802.11n/D9.0, March 2009=
<br><br>So, my understanding is that an HT BSS should always be run with WM=
M support enabled.<br><br><div><div><marquee width=3D"20%">-Sohail</marquee=
><strong></strong></div><br></div>--- On <b>Mon, 31/1/11, Jouni Malinen <i>=
&lt;j at w1.fi&gt;</i></b> wrote:<br><blockquote style=3D"border-left: 2px sol=
id rgb(16, 16,
 255); margin-left: 5px; padding-left: 5px;"><br>From: Jouni Malinen &lt;j@=
w1.fi&gt;<br>Subject: Re: Any idea why hostapd won't send wmm_param element=
s?<br>To: hostap at lists.shmoo.com<br>Date: Monday, 31 January, 2011, 8:37 PM=
<br><br><div class=3D"plainMail">On Mon, Jan 31, 2011 at 06:51:03AM -0800, =
Sam Leffler wrote:<br>&gt; While the h/w is clearly capable of sending at M=
CS w/o WMM the spec<br>&gt; says 11n =3D&gt;'s WMM so I think the 11n confi=
g knob should auto-enable<br>&gt; WMM.&nbsp; The only reason I can think to=
 not enable WMM is for testing.<br><br>I'm not aware of any standard or spe=
cification having a strict rule on<br>the WWM/QoS being enabled (apart from=
 some test plans), but sure, that<br>would be the normal use case for IEEE =
802.11n. I'm thinking of modifying<br>hostapd to enable WMM (with default E=
DCA parameters) whenever<br>ieee80211n=3D1 is used in the configuration wit=
hout explicitly specifying<br>wmm_enabled parameter. In other words, that
 would maintain the option of<br>disabling WMM (wmm_enabled=3D0) while hope=
fully removing most of the cases<br>where the HT AP is left with WMM/QoS di=
sabled accidentally.<br><br>-- <br>Jouni Malinen&nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PGP id EFC895FA<br>____=
___________________________________________<br>HostAP mailing list<br><a ym=
ailto=3D"mailto:HostAP at lists.shmoo.com" href=3D"/mc/compose?to=3DHostAP at lis=
ts.shmoo.com">HostAP at lists.shmoo.com</a><br><a href=3D"http://lists.shmoo.c=
om/mailman/listinfo/hostap" target=3D"_blank">http://lists.shmoo.com/mailma=
n/listinfo/hostap</a><br></div></blockquote></td></tr></table><br>
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