IEEE 802.11-25/0537r0 Discussion on NPCA Minimum Duration Threshold
This document discusses the proposed mechanism to address CID 1783 concerning the NPCA Minimum Duration Threshold in the IEEE 802.11-25/0537r0 draft. The minimum duration threshold is crucial for efficient power utilization during NP-channel operations. Various aspects, including analysis, proposal, and a straw poll, are examined to determine the appropriate threshold value to optimize NP-channel switching.
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March 2025 doc.: IEEE 802.11-25/0537r0 Discussion on NPCA Minimum Duration Threshold Date: 2025-03-26 Authors: Name Affiliations Address Phone email Chaoming Luo OPPO luochaoming@oppo.com Liuming Lu OPPO Ning Gao OPPO Yapu Li OPPO Liangxiao Xin OPPO Submission Slide 1 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0537r0 Abstract Proposes a mechanism to resolve CID 1783. CID Clause Comment 1783 37.10 The NPCA Minimum Duration Threshold should be long enough to complete at least one frame exchange in the NPCA P-channel, otherwise it's waste of power to do the switch. Submission Slide 2 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0537r0 Discussion Draft 0.1 defines: The NPCA Minimum Duration Threshold field indicates the minimum duration of inter-BSS activity (inter-BSS PPDU or inter-BSS TXOP) that is required to have been indicated on the primary channel of the BSS as a necessary condition to permit an NPCA STA to switch to the NPCA primary channel to perform NPCA operation. The encoding and the maximum value of this field are TBD. [1] We should also limit the minimum value of this field to avoid meaningless NPCA switching as stated in the comment. Submission Slide 3 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0537r0 Analysis and Proposal The minimum time the NPCA operation consumes: At least a NPCA Switching Delay of the AP A medium sync time, consumes at least 72 us At least one EDCA backoff, consumes a minimum of PIFS, i.e., 25 us. At least one ICF + SIFS + ICR + SIFS sequence, consumes a minimum around 232 us. Assume ICF takes around 128 us (using non-HT PPDU or non-HT duplicate PPDU format using a rate of 6 Mb/s, 12 Mb/s, or 24 Mb/s), ICR takes around 72 us. At least one Data + SIFS + Ack/BA sequence, consumes a minimum around 160 us. Assume Data takes at least 72 us, Ack/BA takes around 72 us. Proposal: The minimum value of the NPCA Minimum Duration Threshold field is greater than or equal to the NPCA Switching Delay of the AP plus 489 us. We may use an arbitrary value to replace the NPCA Switching Delay of the AP, e.g., 252 us. The exact numbers could be discussed further. Submission Slide 4 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0537r0 Straw Poll Do you support to add the following into the latest TGbn draft ? The minimum value of the NPCA Minimum Duration Threshold field is greater than or equal to the NPCA Switching Delay of the AP plus 489 us. Submission Slide 5 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0537r0 References [1] Draft P802.11bn_D0.1 Submission Slide 6 Chaoming Luo, OPPO
