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[STDS-802-11-TGBN] Comments on 25/0438r1 (DUO feedback)



Hi Laurent,

We had comments about the following new text:
If a Per AID TID Info field has the Ack Type subfield equal to 0 and the TID subfield equal to 13 then:
• if the Multi-STA BA is individually addressed to the UHR STA, the AID11 subfield of the AID TID Info subfield is set to the 11 LSBs of the AID of a UHR STA. [#3829]
• if the Multi-STA BA frame is transmitted by an AP and is group addressed, the AID11 subfield of the AID TID Info subfield is set to the 11 LSBs of the AID of a UHR STA that is the intended receiver of the feedback information or to 2008 if the feedback information is intended for all receiving addressed UHR STAs. [#3829]

Currently the use case for feedback are either DL unicast or UL. What kind of feedback is used in the case of  “Multi-STA BA frame is transmitted by an AP and is group addressed”?  
When Acktype=0 and TID=13 received by a legacy STA,  the presence of Block Ack Starting Sequence Control subfield and Block Ack Bitmap subfields would be considered as “N/A” , Legacy STA would take bits immediately after AID TID info subfield as the start of next Per AID TID Info field and could mistaken itself being addressed by this MBA. i.e. it does not know how many bits to skip to the next  Per AID TID Info field.
• We prefer avoiding this. Current in the control frame protection draft text in 11mf, the (Acktype, TID)=(0/1,0) for PN/MIC and padding is used such that legacy STA can parse this.
• If we must have this TID>7, suggest to add condition that the transmitter(s) of the soliciting PPDU does not include pre-UHR STAs

For “if the Multi-STA BA is individually addressed to the UHR STA, the AID11 subfield of the AID TID Info subfield is set to the 11 LSBs of the AID of a UHR STA”,
• Suggest change to “ if the Multi-STA BA is individually addressed to a non-AP UHR STA, the AID11 subfield of the AID TID Info subfield is set to the 11 LSBs of the AID of the UHR STA. If the Multi-STA BlockAck frame is sent to an AP, the AID11 subfield is set to 0.”

Thanks!

Li-Hsiang Sun(MediaTek)

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