Re: [PATCH] cfg80211: VHT (11ac) Regulatory change

[Mahesh Palivela <maheshp@posedge.com>]

On 08/24/2012 05:35 PM, Johannes Berg wrote:
> On Fri, 2012-08-24 at 17:03 +0530, Mahesh Palivela wrote:
>
>> /**
>>    * enum ieee80211_chan_width - channel bandwidths
>>    *
>>    * @IEEE80211_CHAN_WIDTH_20MHZ: 20 MHz chan bandwidth
>>    * @IEEE80211_CHAN_WIDTH_40MHZ: 40 MHz chan bandwidth
>>    * @IEEE80211_CHAN_WIDTH_80MHZ: 80 MHz chan bandwidth
>>    * @IEEE80211_CHAN_WIDTH_160MHZ: 160 MHz chan bandwidth
>>    */
>
> We might need 20MHZ_NOHT or something?

Yes, I missed that.
20MHZ_NOHT in 5G band and legacy operation 2.4G band may be 5MHZ.

>
>>           enum ieee80211_chan_width chan_width2;
>>           u16 control_offset2;
>
> Those shouldn't be necessary, I think? The secondary 80 MHz channel
> can't have a control channel, it seems, and the width should be the same
> as well? Plus this is only allowed in 80+80 anyway.
>
> johannes
>
11ac d3.0 spec section 8.4.2.10 says

An operating class for an 80+80 MHz channel bandwidth is expressed by 
two consecutive Operating/Sub-
band Sequences, where the first Operating/Subband Sequence field 
contains an Operating Triplet for an
80 MHz Channel Spacing with an 80+ Behavior Limit and the second 
Operating/Subband Sequence field
contains an Operating Triplet for an 80 MHz Channel Spacing without an 
80+ Behavior Limit.

so country might allow primary chan to fall in other frequency segment?

- Mahesh