addressesd to the STA, at least one MPDU is correctly received, etc. To change the language, for example, to “unless all outstanding” sort of makes the language sound like if this one condition in this location is met, then the other conditions found throughout the standard can be ignored, but this is not true. John 346.06 This section discusses Add after first Reject if the ignored – Coffey 3 continuing an existing sentence "For signal is anything backoff procedure purposes of the above -82 dBm, then even though another countdown of an the detection of a PPDU has been existing backoff signal at -82 dBm will detected. By procedure, the be impossible, so the 'continuing' a backoff channel shall not proposed requirement procedure, the STA (it be considered cannot be added. The seems) performs CCA "otherwise idle" for group does not see in each new slot, the duration of the the need for a including preamble SRP opportunity"; performance detect. But the CCA for purposes of the requirement, as the requirements for countdown, the HE receiver will naturally preamble detect STA should detect view any incoming assume (for good the beginning of a signal with sufficient reason) an 'otherwise PPDU at a received SINR, where the noise idle' channel (that is, power level of - component of that other than the new or greater SINR will include the PPDU arriving), and within aCCATime signal that is being that's important for the with probability at ignored, as decodable STA to be able to least 90%." and will decode it. achieve the required 90% detection probability within aCCATime. What are the requirements for CCA when an existing backoff procedure is continued? I.e., though there may be an 'SRP opportunity', permitting the STA to 'eschew' updating the NAV, does that mean that the channel is considered to be 'otherwise idle' for purposes of CCA, or not? There are several possibilities, of which the proposed change is just one, but at the very least the spec
addressesd to the STA, at least one MPDU is correctly received, etc. To change the language, for example, to “unless all outstanding” sort of makes the language sound like if this one condition in this location is met, then the other conditions found throughout the standard can be ignored, but this is not true. John Coffey 346.06 This section discusses continuing an existing backoff procedure even though another PPDU has been detected. By 'continuing' a backoff procedure, the STA (it seems) performs CCA in each new slot, including preamble detect. But the CCA requirements for preamble detect assume (for good reason) an 'otherwise idle' channel (that is, other than the new PPDU arriving), and that's important for the STA to be able to achieve the required 90% detection probability within aCCATime. What are the requirements for CCA when an existing backoff procedure is continued? I.e., though there may be an 'SRP opportunity', permitting the STA to 'eschew' updating the NAV, does that mean that the channel is considered to be 'otherwise idle' for purposes of CCA, or not? There are several possibilities, of which the proposed change is just one, but at the very least the spec Add after first sentence "For purposes of the countdown of an existing backoff procedure, the channel shall not be considered "otherwise idle" for the duration of the SRP opportunity"; for purposes of the countdown, the HE STA should detect the beginning of a PPDU at a received power level of or greater within aCCATime with probability at least 90%." Reject – if the ignored signal is anything above -82 dBm, then the detection of a signal at -82 dBm will be impossible, so the proposed requirement cannot be added. The group does not see the need for a performance requirement, as the receiver will naturally view any incoming signal with sufficient SINR, where the noise component of that SINR will include the signal that is being ignored, as decodable and will decode it. - 3
11-18-1410-05-00ax-lb233-cr-spatial-reuse.docx