[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[Ocean Su]

Hi ath9k team:
	I now we support 40MHz in 5G for 802.11n . 
but it seems we don't support 40M in 2.4G for 802.11n.  

	I just want to confirm with you. 

I also see this :
/*! * @brief   Check whether the HT40 is available on @channel according to @regulatory.
 *          If yes, should the secondary channel is above it or below it.
 *          Note: HT40 will only be applied on 5Ghz band.
 *
 * @ret     0: unavailable
 *          1: available, and the secondary channel should above it
 *         -1: available, and the secondary channel should below it
 */
static int check_ht40_capab(regulatory_st *regulatory, int channel)
{

Thanks! 
Ocean su 

[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[Adrian Chadd]

Yes. The 802.11n NICs support 20/40MHz operation in both 2 and 5GHz bands.



Adrian

On 11 July 2012 20:14, Ocean Su <Ocean.Su@watchguard.com> wrote:
> Hi ath9k team:
>         I now we support 40MHz in 5G for 802.11n .
> but it seems we don't support 40M in 2.4G for 802.11n.
>
>         I just want to confirm with you.
>
> I also see this :
> /*! * @brief   Check whether the HT40 is available on @channel according to @regulatory.
>  *          If yes, should the secondary channel is above it or below it.
>  *          Note: HT40 will only be applied on 5Ghz band.
>  *
>  * @ret     0: unavailable
>  *          1: available, and the secondary channel should above it
>  *         -1: available, and the secondary channel should below it
>  */
> static int check_ht40_capab(regulatory_st *regulatory, int channel)
> {
>
> Thanks!
> Ocean su
> _______________________________________________
> ath9k-devel mailing list
> ath9k-devel at lists.ath9k.org
> https://lists.ath9k.org/mailman/listinfo/ath9k-devel

[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[Ocean Su]

But I see below test result.  I don?t know why the 2.4G can?t go up to 40MHz.



/tmp/hostapd.conf

iw ath1 station dump

In 2.4G

hw_mode=g
ieee80211n=1
channel=6
rts_threshold=2346
fragm_threshold=2346
ht_capab=[HT40-]

wgsupport at Firebox:~# iw ath1 station dump
Station 00:1f:3b:06:f1:d3 (on ath1)
        inactive time:  856 ms
        rx bytes:       636
        rx packets:     4
        tx bytes:       524
        tx packets:     4
        signal:         -57 dBm
        tx bitrate:     156.0 MBit/s MCS 21

In 5G

hw_mode=a
ieee80211n=1
channel=153
rts_threshold=2346
fragm_threshold=2346
ht_capab=[HT40-]

wgsupport at Firebox:~# iw ath1 station dump
Station 00:1f:3b:06:f1:d3 (on ath1)
        inactive time:  3636 ms
        rx bytes:       7682
        rx packets:     78
        tx bytes:       3927
        tx packets:     27
        signal:         -60 dBm
        tx bitrate:     324.0 MBit/s MCS 21 40Mhz
wgsupport at Firebox:~#


From http://mcsindex.com/
For 2.4GHz   We see when wireless working on MCS 21  and 20MHz the data rate is 156Mbps (just as we see now)
               For 5GHz     We see when wireless working on MCS 21  and 40MHz the data rate is 324Mbps.







-----Original Message-----
From: adrian.chadd@gmail.com [mailto:adrian.chadd at gmail.com] On Behalf Of Adrian Chadd
Sent: 2012?7?15? 17:40
To: Ocean Su
Cc: ath9k-devel at lists.ath9k.org
Subject: Re: [ath9k-devel] do we support 40MHz in 802.11n 2.4G



Yes. The 802.11n NICs support 20/40MHz operation in both 2 and 5GHz bands.







Adrian



On 11 July 2012 20:14, Ocean Su <Ocean.Su at watchguard.com<mailto:Ocean.Su@watchguard.com>> wrote:

> Hi ath9k team:

>         I now we support 40MHz in 5G for 802.11n .

> but it seems we don't support 40M in 2.4G for 802.11n.

>

>         I just want to confirm with you.

>

> I also see this :

> /*! * @brief   Check whether the HT40 is available on @channel according to @regulatory.

>  *          If yes, should the secondary channel is above it or below it.

>  *          Note: HT40 will only be applied on 5Ghz band.

>  *

>  * @ret     0: unavailable

>  *          1: available, and the secondary channel should above it

>  *         -1: available, and the secondary channel should below it

>  */

> static int check_ht40_capab(regulatory_st *regulatory, int channel) {

>

> Thanks!

> Ocean su

> _______________________________________________

> ath9k-devel mailing list

> ath9k-devel at lists.ath9k.org<mailto:ath9k-devel@lists.ath9k.org>

> https://lists.ath9k.org/mailman/listinfo/ath9k-devel

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[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[Daniel Golle]

On 16/07/12 03:48, Ocean Su wrote:
> But I see below test result.  I don?t know why the 2.4G can?t go up to 40MHz.
Probably the spectrum is busy. HT40+/- is only used when there is no other
activity on the secondary channel. You can use the "no_scan" option in
hostapd.conf to override this behaviour and use HT40+/- anyway for testing
purposes (but this is doesn't comply with the 802.11n spec and probably even
regulation)

[ath9k-devel] do we support 40MHz in 802.11n 2.4G

[Ben Greear]

On 07/15/2012 09:44 PM, Daniel Golle wrote:
> On 16/07/12 03:48, Ocean Su wrote:
>> But I see below test result.  I don?t know why the 2.4G can?t go up to 40MHz.
> Probably the spectrum is busy. HT40+/- is only used when there is no other
> activity on the secondary channel. You can use the "no_scan" option in
> hostapd.conf to override this behaviour and use HT40+/- anyway for testing
> purposes (but this is doesn't comply with the 802.11n spec and probably even
> regulation)

Turn on debugging in hostapd and check the logs...it should print out the
reason for not doing ht-40 if you are using recent code.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com