For HT and VHT one of the things that is missing is the total length of aggregates (including padding) - it’s in the L-SIG header, would be nice to have it exposed (since most chipsets pass up everything that’s in the header). I assume the same will be true for ax. Also some standardized way to put aggregates back together. My latest wireshark extension uses same TSF as that clue. See https://code.wireshark.org/review/#/c/20043/ <https://code.wireshark.org/review/#/c/20043/>

Simon

> On Feb 13, 2017, at 5:23 AM, Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org> wrote:
> 
> Hi,
> 
> We're looking to add HE/11ax extensions to radiotap.
> 
> Has anyone else already identified the data that would be necessary?
> 
> So far I have - assuming 'presence bits' for each,
> 
> for HE_SU:
> * beam change (1 bit)
> * UL/DL (1 bit)
> * MCS (4 bits)
> * DCM (1 bit)
> * BSS color (6 bits)
> * spatial reuse (TBD)
> * bandwidth
> * GI+LTF size (2 bits)
> * Nsts
> * TXOP duration (7 bits)
> * Coding (BCC/LDPC)
> * LDPC extra symbol flag
> * STBC flag
> * TX BF flag
> * pre-FEC padding factor
> * PE disambiguity
> * doppler mode
> 
> for HE_MU:
> * UL/DL
> * MCS
> * DCM
> * BSS color
> * spatial reuse
> * TXOP Duration
> * bandwidth
> * # of HE SIGB symbols
> * SIG-B compression
> * GI+LTF size
> * # of HE-LTF symbols
> * LDPC extra symbol flag
> * STBC
> * pre-FEC padding factor
> * PE disambiguity
> * doppler mode
> * RU allocation
> * center 26 tone RU
> * per-user: STA-ID, Nsts, TX BF, MCS, DCM, Coding
> 
> for HE_TRIG:
> (similar to HE_SU but a little restricted)
> 
> 
> Obviously a number of these fields are in all three formats, and I
> haven't really done a full size analysis, but perhaps we should split
> the extra MU fields into a separate bit so that they don't have to have
> space allocated to them when not used, for SU/TRIG formats?
> 
> johannes