IEEE 802.11 Distributed Spatial Reuse Enhancements
Explore enhancements in IEEE 802.11 standard for distributed spatial reuse (DRU) to boost spectral efficiency and address low-power spectral density limitations. Proposals include improving DRU sharing among devices in overlapping basic service sets (OBSS), optimizing UL-OFDMA with DRU to enhance spectral efficiency, and maximizing range and throughput with different DRU options. Further improvements are suggested for Option 2 to allow unused DRUs for OBSS devices, reducing contention and improving access delays.
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doc.: IEEE 802.11-24/524r0 Multiple AP Transmissions Using DRU Date: 2024-03-07 Authors: Name Leonardo Lanante Affiliations Ofinno Address Phone email llanante@ofinno.com Serhat Erkucuk Jeongki Kim Jiayi Zhang Tuncer Baykas Hamid Hosseinianfar Submission
March 2024 doc.: IEEE 802.11-24/524r0 Abstract Distributed spatial reuse (DRU) was recently agreed for addition in the TGbn Specification Document [1]. DRU can provide transmit power boost for devices operating with low power spectral density limitation. Several contributions have explored various high level DRU aspects including tone plan, DRU bandwidth and puncturing [2-4] In this contribution, we consider DRU sharing to OBSS STAs (e.g. Shared APs) to improve the spectral efficiency of DRUs. Submission Slide 2 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 Distributed RU in UL OFDMA DRU is particularly useful in UL-OFDMA All STAs transmit at boosted transmit power When there are enough STAs to transmit on all available DRUs, spectral efficiency is also maintained. PSD limitation of LPI devices is mitigated using DRU during UL OFDMA. STA1 STA2 AP STA3 Submission Slide 3 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 Maximizing Range and Spectral Efficiency RRU Option DRU Option 2 DRU Option 1 484-tone RRU 52-tone DRU STA 2 52-tone DRU 484,242,106,tone DRUs STA 1 STA 2 484-tone DRU STA 2 STA 1 STA 1 484-tone DRU Unused Transmit Power Boost = 11.14 dB Transmit Power Boost = 2.69 dB Transmit power boost gained when using DRU instead of RRU can improve range or throughput. Two options are possible when using DRU Option 1 - The AP allocates all available DRUs to the STAs. The transmit power boost may be limited depending on the number of STAs and spreading BW. Option 2 - The AP leaves some DRUs unused to enable higher transmit power per tone. In this option, the transmit power boost can be much higher than Option 1. In some cases, Option 2 may result in higher throughput or range than Option 1. Propose TGbn to support both Options 1 and 2. Submission Slide 4 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 Proposal: Further improvements for Option 2 Option 2 intentionally leaves some DRU unused. A further improvement is to allow an OBSS STA (e.g. Slave APs) to use the unused DRUs. - improves spectral efficiency - reduced contention from OBSS APs reduces access delay and reduces collisions. AP 1 controls whether another OBSS STA/AP can access the unused DRU - when AP 1 is part of a coordinating AP set, AP 1 can explicitly indicate which shared AP can use the unused DRU. - otherwise, any STA/AP are allowed to transmit (conditions/restrictions are TBD). dRU 1 - STA 1 dRU 2 - STA 2 dRU 3- AP2 TF AP 1 non-dRU portion dRU portion (dRU 1) STA 1 non-dRU portion dRU portion (dRU 2) STA 2 non-dRU portion dRU portion (dRU 3) AP2 STA3 DRU portion alignment Submission Slide 5 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 Other considerations dRU 1 - STA 1 dRU 2 - STA 2 dRU 3- AP2 Since the preamble is not transmitted using DRU, interference will occur for the non-DRU portion of the transmission. One solution could be Non-DRU portion of PPDU transmitted by OBSS STA use PSR based SR type power control. DRU portion of PPDU transmitted by OBSS STA may be transmitted at full boosted transmit power. TF AP 1 non-dRU portion dRU portion (dRU 1) STA 1 non-dRU portion dRU portion (dRU 2) STA 2 non-dRU portion dRU portion (dRU 3) AP2 STA3 DRU portion alignment Submission Slide 6 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 Conclusion An AP may choose not to allocate all DRUs to uplink STAs in order to maximize the transmit power boost. Some of the unused DRUs may be shared to another AP or STA to increase the spectral efficiency. We presented a proposal to enable sharing of the unused DRUs to an OBSS AP or STA. Submission Slide 7 Leonardo Lanante, Ofinno
March 2024 doc.: IEEE 802.11-24/524r0 References [1] https://mentor.ieee.org/802.11/dcn/24/11-24-0171-03-00bn-tgbn-motions- list-part-1.pptx [2] https://mentor.ieee.org/802.11/dcn/23/11-23-1919-00-00bn-dru- proposal.pptx [3] https://mentor.ieee.org/802.11/dcn/23/11-23-1988-00-00bn-considerations- on-dru-design-and-application.pptx [4] https://mentor.ieee.org/802.11/dcn/23/11-23-2020-00-00bn-high-level- perspective-on-distributed-tone-ru-for-11bn.pptx Submission Slide 8 Leonardo Lanante, Ofinno
