IEEE 802.11-25/0687r1 Spatial Reuse Discussion in April 2025
Explore the discussion on spatial reuse in IEEE 802.11-25/0687r1 document in April 2025 regarding UHR devices, SR conditions, and proposals for OBSS PD-based operations. Understand the implications on ELR PPDU and the preferences outlined for UHR devices.
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April-2025 doc.: IEEE 802.11-25/0687r1 Spatial Reuse Discussion Date: 2025-04-09 Authors: Name Juan Fang Laurent Cariou Qinghua li Danny Alexander Shlomi Vituri Affiliations Intel Address 2111 NE 25th Ave, Hillsboro OR 97124, USA Phone email Juan.fang@intel.com Submission Slide 1 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 Introduction The description of spatialreuse subfield in UHR-SIG, UHR TB PPDU and trigger frame is TBD in 802.11bn 0.1[1]. Keep as it is or set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED or remove this field? According to the SR condition defined in 802.11ax. One of the conditions to allow OBSS PD based SR is only applied when the spatial reuse subfield is present: Therefore, UHR device is also allowed to do OBSS PD-based SR over ELR PPDU if all other conditions defined in [11meD7.0P4164] are met[2]. Submission Slide 2 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 Summary of SR in UHR and potential issue on ELR PPDU UHR devices perform SR on HE/EHT, UHR MU, UHR TB, UHR ELR PPDU PPDU type Receiver OBSS PD_based SR HE/EHT SR is allowed if the SR field of the received inter-BSS PPDU is not set to be PSR_AND_NON_SRG_OBSS_PD_PROHIBITED UHR Description of SR field is kept as it is: SR is allowed if the SR field of the received inter-BSS PPDU is not set to be PSR_AND_NON_SRG_OBSS_PD_PROHI BITED SR is not allowed if the SR field of the received inter-BSS PPDU is set to be PSR_AND_NON_SRG_OBSS_PD_PROHI BITED Description of SR field is fixed to PSR_AND_NON_ SRG_OBSS_PD_P ROHIBITED SR is not allowed over UHR MU or TB PPDU Remove SR field and disable SR in UHR MU/TB PPDU UHR ELR PPDU SR is allowed over the received ELR PPDU with current SR rules. Submission Slide 3 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 Proposal to disallow UHR device to perform SR on ELR PPDU In 802.11bn OBSS PD-based Spatial reuse operation, a UHR STA follows the rules defined in EHT (35.10.2) except that the condition 5) [11meD7.0P4164] below is updated as following 5) The received PPDU is one of the following: For non-EHT PPDU, the SPATIAL_REUSE subfield (if present) is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. For other PPDUs, the SPATIAL_REUSE subfield is present and is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. as Submission Slide 4 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 Summary of our preference The description of spatial reuse subfield in UHR-SIG, U-SIG of UHR TB PPDU and trigger frame will be kept the same as it is in EHT Update condition 5) defined in [11meD7.0P4164] as 5) The received PPDU is one of the following: For non-EHT PPDU, the SPATIAL_REUSE subfield (if present) is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. For other PPDUs, the SPATIAL_REUSE subfield is present and is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. in 802.11bn to disable SR from UHR device over ELR PPDU. Submission Slide 5 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 References 1. Draft P802.11bn_D0.1.pdf 2. https://mentor.ieee.org/802.11/dcn/24/11-24-1861-00-00bn-discussion-on- spatial-reuse-and-elr-transmission.pptx Submission Slide 6 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 SP1 Do you agree to include the following into the 11bn SFD? Remove the TBD in the current spatial reuse subfield in UHR-SIG of UHR MU PPDU, U-SIG of UHR TB PPDU, Common Info and Special User Info Field of the trigger frame. Note: Remove the TBD means SR subfield will be kept the same as that in EHT. Submission Slide 7 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 SP2 Do you agree to include the following into the 11bn SFD? Add the following paragraph in 11bn OBSS PD-based Spatial reuse operation subclause: A UHR STA follows the rules defined in 35.10.2 (OBSS PD-based spatial reuse operation), except that the condition 5 defined in 26.10.2.2 (General operation with non-SRG OBSS PD level) is updated as follows: 5) The received PPDU is one of the following: For non-EHT PPDU, the SPATIAL_REUSE subfield (if present) is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. For other PPDUs, the SPATIAL_REUSE subfield is present and is not set to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED. NOTE As a result, a UHR STA is not allowed to use OBSS PD-based spatial reuse when the received PPDU is a UHR ELR PPDU or a value of PHY Version Identifier field in U-SIG is one of Validate values. Submission Slide 8 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 SP3 Do you agree to add the non-EHT PPDU definition in 11bn as following? non-extremely-high-throughput (non-EHT) physical layer (PHY) protocol data unit (PPDU): [non-EHT PPDU] A PPDU that is transmitted using a PPDU format defined in Clause 15 (DSSS PHY specification for the 2.4 GHz band designated for ISM applications), Clause 16 (High rate direct sequence spread spectrum (HR/DSSS) PHY specification), Clause 17 (Orthogonal frequency division multiplexing (OFDM) PHY specification), Clause 18 (Extended Rate PHY (ERP) specification), Clause 19 (High Throughput (HT) PHY specification(#2297)), Clause 21 (Very high throughput (VHT) PHY specification) or Clause 27 (High Efficiency (HE) PHY specification). Submission Slide 9 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 SP4 Do you agree to include the following into the 11bn SFD? UHR STA shall set the Spatial Reuse subfield to PSR_AND_NON_SRG_OBSS_PD_PROHIBITED in the Co-SR and Co-BF transmission. Submission Slide 10 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 Backup Submission Slide 11 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 OBSS PD-based spatial reuse operation Related to the STA itself Related to the associated AP Submission Slide 12 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 OBSS PD-based spatial reuse operation (cont.) Related to the STA itself not applied if SR is not present Submission Slide 13 Juan Fang, Intel
April-2025 doc.: IEEE 802.11-25/0687r1 OBSS PD-based spatial reuse operation (cont.) Submission Slide 14 Juan Fang, Intel
