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Re: [STDS-802-11-TGAX] Support for .11ac beamforming in non-infrastructure

Hi Adrian,

 

In Table 8-18a, Per STA Info field of NDP Announcement frame is defined for STA in infrastructure BSS, AP, non-AP STA in infrastructure BSS, IBSS, mesh network. 11mc’s VHT beamforming already works in IBSS, mesh and outside BSS contexts.

 

The resolution could be “If the VHT NDP Announcement frame contains only one STA Info field, then the RA field is set to the address of the STA expected to process the following VHT NDP and prepare the sounding feedback identified by the AID in the STA Info field.”

 

Best Regards,

Liwen

 

From: *** 802.11 TGax - HEW - High Efficiency WLAN *** [mailto:STDS-802-11-TGAX@xxxxxxxx] On Behalf Of Stephens, Adrian P
Sent: Thursday, May 05, 2016 6:08 AM
To: STDS-802-11-TGAX@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGAX] Support for .11ac beamforming in non-infrastructure

 

Dear TGm and TGax participants,

 

(Including TGax because many of those involved in TGac are participating there).

 

TGmc is considering a comment on mechanism introduced in 802.11ac thus:

comments

Selected

CID

Page

Clause

Resn Status

Comment

Proposed Change

Resolution

Owning Ad-hoc

0

7770

615.36

9.3.1.20

It says "If the VHT NDP Announcement frame contains only one STA Info field, then the RA field is set to the address of the STA identified by the AID in the STA Info field.", but the AID in the STA Info field cannot identify a STA, if that STA is in fact an AP or a mesh STA or an IBSS STA. Also, there's no AID in the STA Info field

Change to "If the VHT NDP Announcement frame contains only one STA Info field and the frame is directed to a non-AP STA in an infrastructure BSS, then the RA field is set to the address of the STA identified by the AID12 subfield in the STA Info field."

MAC

 

The issue is that the VHT NDP Announcement frame uses AID to identify STAs,  but AIDs exist only

in infrastructure networks.   So what to do in a non-infrastructure network? 

 

Before TGmc go ahead and indicate that VHT Beamforming (or at least,  the VHT NDP Announcement frame) works only in an infrastructure network,

I’d like to solicit input from the participants of the original work as to whether it was intended for VHT beamforming to work in IBSS, mesh and outside BSS contexts.

Comments welcome.

 

Best Regards,

 

Adrian P STEPHENS

 

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Tel: +1 (971) 330 6025 (mobile)

 

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