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Hi all, In the D.01 PDT document, for Non-TB sensing measurement instance (Fig. 11.41f), If the non-AP STA initiator is only sensing transmitter, then R2I NDP is an overhead. Hence, the draft says the R2I NDP should be transmitted with minimum
possible length with one LTF symbol. So, the spec says this fact should be configured (or coded) in the NDPA frame. Is this easy to do? I am guessing that it would involve the MLME (at the AP) to extract/decode that information from the NDPA frame and then
configure its PHY to send only one LTF symbol while transmitting R2I NDP. Similar problem when the non-AP STA is only sensing receiver. Instead, can we use TF-sounding for this purpose? That is, if the non-AP STA is only transmitter, then it sends “regular” NDPA and then I2R NDP and the AP does not send R2I NDP. If the non-AP STA is only receiver, then it sends a TF-sounding
trigger frame to the AP and then waits for the AP to send R2I NDP (no I2R NDP in this case). Of course, if the non-AP STA is both transmitter and receiver then it has to do both the sequences (this case has more overhead than the current protocol in D.01).
So, in this solution there is no need for a “special” NDP (with one LTF symbol). Of course, the above proposed solution throws the concept of TB into a spin, i.e., currently TB is only used when AP is the sensing initiator. With the proposed solution, non-AP STA uses “part” of the TB sensing paradigm: only the TF-sounding
concept. Would love to hear thoughts of other members. My apologies if this is too late to discuss. thanks and regards -Anirud Anirudha (Anirud) Sahoo (He/Him) https://sites.google.com/view/a-sahoo National Institute of Standards and Technology Wireless Networks Division Communications Technology Lab 100 Bureau Drive, Stop 6730 Gaithersburg, MD 20899 Ph: 301-975-4439 To unsubscribe from the STDS-802-11-TGBF list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBF&A=1 |