Re: question on SMPS for AP

[<vivekanandah@posedge.com>]

Hi helmut,

thanks for the response.

thanks and regards
Vivek


On Wed, 3 Apr 2013 10:09:51 +0200, Helmut Schaa wrote:
> Hi Vivek,
>
> On Wed, Apr 3, 2013 at 10:05 AM, Johannes Berg  wrote:
>
>> The driver or rate control algorithm has to
>> take this into account, I'm not certain that all drivers and
>> algorithms
>> do this correctly (yet).
>
> Just as an example, in rt2x00  we just have to set one bit in the tx
> descriptor to
> force the hw to send out a 1-stream RTS to wake up the peer, from
> rt2x00queue.c:
>
>                 /*
>                  * MIMO PS should be set to 1 for
> STA's using dynamic SM PS
>                  * when using more then one tx stream
> (>MCS7).
>                  */
>                 if (sta && txdesc->u.ht.mcs > 7 &&
>                      sta->smps_mode ==
> IEEE80211_SMPS_DYNAMIC)
>                        
> __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
>
> HTH,
> Helmut
>
>
> Links:
> ------
> [1] mailto:johannes@sipsolutions.net