Re: Patch: Prepare for some cleanups of 802.11ad

[Guy Harris <guy () alum mit edu>]

On Aug 22, 2015, at 1:44 PM, Richard Sharpe <realrichardsharpe () gmail com> wrote:

> On Sat, Aug 22, 2015 at 1:32 PM, Guy Harris <guy () alum mit edu> wrote:
>
> > No, I'd add a DMG field to radiotap, containing, among other values, an mcs subfield, with a Clause 21 MCS value in 
> > it.
>
> Yes, in an ideal world. However, there will likely be captures out
> there for a while yet that do not have such a DMG field because it is
> not yet defined.

So software that reads radiotap captures and that cares about 11ad information needs to have a workaround wherein 
frames lacking a DMG field (which means "all frames", currently, as there isn't yet a DMG field) and having a channel 
frequency in the 11ad range have an 11ad PHY and, if they have MCS or VHT fields, ignore all items in those fields that 
don't apply to 11ad and *perhaps* interpret the MCS value in the MCS field as if it were an 11ad MCS value rather than 
an 11n MCS value.

> > I'm a software engineer, not an electrical engineer, so I'm not even remotely close to an authority on what 
> > radio-layer information would be useful, but a quick look at Clause 21 suggests that it might want to include a flag 
> > to indicate whether "Static Tone Pairing" or "Dynamic Tone Pairing" was used.
>
> Can you make that suggestion on the radiotap mailing list?

I've followed up to your radiotap message with a suggestion for a DMG field.

> I can then communicate it to the appropriate parties and perhaps get
> them to join that mailing list as well.

If they're using radiotap for 11ad frames, they most definitely should join the mailing list.
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