Spatial Reuse in IEEE 802.11 - Overview and Proposal
This document explores the concept of spatial reuse in IEEE 802.11 standards, particularly focusing on the 11ax and 11be amendments. It discusses the benefits of spatial reuse, proposing enhancements for better utilization of spectrum and improved efficiency in wireless communications. The proposed techniques aim to optimize spatial reuse opportunities and enhance performance in multi-user scenarios. The document also highlights the importance of addressing interference levels and the technical considerations for implementing spatial reuse effectively within the IEEE 802.11 framework.
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doc.: IEEE 802.11-20/1880r1 January 2021 SR Field in TB PPDU Date: 2021-01-11 Authors: Name Affiliations Address Phone email Ron Porat Broadcom ron.porat@broadcom.com Zhou Lan Broadcom Submission Slide 1 Ron Porat (Broadcom)
doc.: IEEE 802.11-20/1880r1 January 2021 Summary PSR based spatial reuse was discussed in 11ax [1][2] and accepted in the TB PPDU Also discussed in the context of SU/MU PPDU We have experimented with this new technology and would like to reiterate here the proposal in [3] for two SR fields in the TB PPDU Although OBSS_PD is mainstream, this is a more surgical approach to SR, targeting a specific recipient. This will enable continuity of this technology from 11ax to 11be In release 2 could further discuss this technology in the context of MU PPDU Submission Slide 2 Ron Porat (Broadcom)
doc.: IEEE 802.11-20/1880r1 January 2021 11ax PSR based Spatial Reuse Scenario 1: SR Opportunity identified from Trigger frame AP SR Duration in Trigger frame Common info Trigger frame BSS_B HE TB PPDU Trigger frame SR responder TX PowerSR Initiator < PSR RSSITrigger frame Non-AP STA Scenario 2: SR opportunity identified from HE TB PPDU Trigger not heard/decoded by SR initiator (e.g., if trigger is carried in MU PPDU) HE TB PPDU BSS_G SR Duration in L-SIG of HE TB PPDU SR initiator Trigger frame HE TB PPDU TX PowerSR Initiator < PSR RSSIprevious frame from AP with same color If a PSR opportunity is identified by decoding the SIG A of HE TB PPDU, then the RSSI of previous frame from AP with the same color received (e.g. a beacon frame) can be used to determine the TX power of the SR transmission Spatial Reuse field in HE TB PPDU is required for the missing trigger scenario Submission Slide 3 Ron Porat (Broadcom)
doc.: IEEE 802.11-20/1880r1 January 2021 Spatial Reuse Field Values in 11ax PSR = AP_TXPWR + Acceptable_interference_level (normalized to 20MHz) For example, with AP power at 10dBm can allow SR with as low as -90dBm interference level or higher. Two SR fields enable the AP to allow two different interference levels in each half of the BW Submission Slide 4 Ron Porat (Broadcom)
doc.: IEEE 802.11-20/1880r1 January 2021 Reference 1. https://mentor.ieee.org/802.11/dcn/17/11-17-0075-08-00ax-srp- based-sr-summary-and-update.pptx https://mentor.ieee.org/802.11/dcn/16/11-16-1216-02-00ax-sr- field-srp-table-for-he-trigger-based-ppdu.pptx https://mentor.ieee.org/802.11/dcn/20/11-20-1546-00-00be-u-sig- design-for-tb-ppdu.pptx 2. 3. Submission Slide 5 Ron Porat (Broadcom)
doc.: IEEE 802.11-20/1880r1 January 2021 SP 1 Do you support to have two SR fields (4 bits each, total 8 bits), with granularity of half PPDU BW, but no smaller than 20MHz, in the U- SIG of TB PPDU? Values in SR fields are defined same as in 11ax Submission Slide 6 Ron Porat (Broadcom)
