8058 167 34 The sentence "An AP As in comment. Revised Agree in principle. may use any AC for Revised as described in sending a PPDU that doc.: 17/448r0 contains only Trigger frames." allows an AP to use the voice AC to "preempt" the medium, event if it knows, through reporting for instance, that the addressed STAs only have background traffic to transmit. In my opinion, we should at least recommend for data traffic that if the AP knows the AC categories of the buffered traffic of the addressed STAs, it should use the lowest AC reported for sending a PPDU that contains such Trigger frame 8275 167 38 It is stated that "An AP Procedure can Revised Agree in principle. may send the Trigger envisage a Revised as described in using any access mapping between doc.: 17/448r0 category and follows the priority of the the rules defined in TF and the Access 10.22.2". This is not Categories AC0 - applicable at all AC3 to insert the because AP does not trigger frame. As know which AC to example, by use. following For Data or Ack sentence: frames, the AC is " the trigger determined by may be conveyed examining the TID in the AC that field of MSDU packet corresponds to the ( TID is linked to UPs type of uplink of MSDU from higher traffic that the HE layer as refer to STAs are requested 5.1.1.3). For a to send in response Management frame, to the trigger the AC is AC_VO. frame. If different What is the procedure ACs are requested for a Trigger Frame, as to STAs, the HE it is a control frame AP may select an (which by essence has Access Category no TID) ? for the trigger frame
8058 167 34 The sentence "An AP may use any AC for sending a PPDU that contains only Trigger frames." allows an AP to use the voice AC to "preempt" the medium, event if it knows, through reporting for instance, that the addressed STAs only have background traffic to transmit. In my opinion, we should at least recommend for data traffic that if the AP knows the AC categories of the buffered traffic of the addressed STAs, it should use the lowest AC reported for sending a PPDU that contains such Trigger frame As in comment. Revised Agree in principle. Revised as described in doc.: 17/448r0 8275 167 38 It is stated that "An AP may send the Trigger using any access category and follows the rules defined in 10.22.2". This is not applicable at all because AP does not know which AC to use. For Data or Ack frames, the AC is determined by examining the TID field of MSDU packet ( TID is linked to UPs of MSDU from higher layer as refer to 5.1.1.3). For a Management frame, the AC is AC_VO. What is the procedure for a Trigger Frame, as it is a control frame (which by essence has no TID) ? Procedure can envisage a mapping between the priority of the TF and the Access Categories AC0 - AC3 to insert the trigger frame. As example, by following sentence: " the trigger may be conveyed in the AC that corresponds to the type of uplink traffic that the HE STAs are requested to send in response to the trigger frame. If different ACs are requested to STAs, the HE AP may select an Access Category for the trigger frame Revised Agree in principle. Revised as described in doc.: 17/448r0