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1. **Title:** IEEE 802.11-24/0635r0: Coordinated Spatial Re-Use and Coordinated Spatial Nulling 2. **Summary:** This do

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1. **Title:** IEEE 802.11-24/0635r0: Coordinated Spatial Re-Use and Coordinated Spatial Nulling 2. **Summary:** This do

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  1. March 2024 doc.: IEEE 802.11-24/0635r0 Coordinated Spatial Re-Use and Coordinated Spatial Nulling Follow-Up Date: 26-Mar-24 Name Rainer Strobel Affiliations MaxLinear email rstrobel@maxlinear.com Sigurd Schelstraete Iñaki Val Marcos Martinez Submission Slide 1 Rainer Strobel, MaxLinear

  2. March 2024 doc.: IEEE 802.11-24/0635r0 Introduction In previous submissions [1, 2], the spatial nulling concept and simulations were presented MU-MIMO based spatial nulling performance Coordination scenarios Precoder computation options This contribution addresses some feedback received on previous submissions Relation of coordinated spatial re-use (C-SR) and coordinated spatial nulling (C-SN) Comparison between coordinated beamforming and coordinated spatial nulling Synchronization requirements (example) Straw poll Submission Slide 2 Rainer Strobel, MaxLinear

  3. March 2024 doc.: IEEE 802.11-24/0635r0 Coordinated Spatial Re-use (C-SR) and Coordinated Spatial Nulling (C-SN) C-SN is an extension to C-SR in cases, where C-SR is inefficient • When there are free resources (more Tx antennas than spatial streams transmitted) and an un-associated STA is close, perform spatial nulling • If there is no gain, keep C-SR or TDMA Low interference, Reduce power 2 streams 2 streams High interference, spatial null 2 streams 2 streams 1 streams Submission Slide 3 Rainer Strobel, MaxLinear

  4. March 2024 doc.: IEEE 802.11-24/0635r0 Beamforming vs. MU-MIMO Scenario • TDMA Beamforming • In our contributions, TDMA MU- MIMO is used as a baseline • For C-SR and C-SN, MU-MIMO transmission is assumed, too (e.g., each AP serves more than one STA at a time) • The reason is that MU-MIMO always outperforms beamforming, which is shown in the following simulation results t4 t2 t1 t3 • C-SR/C-SN Beamforming t2 t1 Submission Slide 4 Rainer Strobel, MaxLinear

  5. March 2024 doc.: IEEE 802.11-24/0635r0 Aggregated Rates TDMA vs. C-SR TDMA vs. C-SN Submission Slide 5 Rainer Strobel, MaxLinear

  6. March 2024 doc.: IEEE 802.11-24/0635r0 STA Rates TDMA vs. C-SR TDMA vs. C-SN Submission Slide 6 Rainer Strobel, MaxLinear

  7. March 2024 doc.: IEEE 802.11-24/0635r0 Rate Distribution in Space Beamforming TDMA Beamforming C-SR/C-SN C-SR Half coordinated C-SN Fully coordinated Submission Slide 7 Rainer Strobel, MaxLinear

  8. March 2024 doc.: IEEE 802.11-24/0635r0 Spatial Nulling and Symbol Alignment On OFDM symbol boundaries, spatial nulling is not perfect [3] The interference at the symbol boundaries depends on the channel characteristics (e.g., a flat channel doesn‘t cause interference at the symbol boundaries) Interference depends on the transmit signal characteristics, e.g., tx windowing If OFDM symbol boundaries are aligned, this interference doesn‘t affect the receiver. Submission Slide 8 Rainer Strobel, MaxLinear

  9. March 2024 doc.: IEEE 802.11-24/0635r0 Alignment requirements Time and Clock Synchronization • The synchronization requirements are much lower than e.g., for joint transmission [4], where the acceptable drift of the sample timing is only a fraction of a sample. • Depending on the channel conditions a shift of a few samples is acceptable. • A clock accuracy of +-0.07ppm is sufficient to stay within this range. 65.2ns Submission Slide 9 Rainer Strobel, MaxLinear

  10. March 2024 doc.: IEEE 802.11-24/0635r0 Straw Poll Do you agree to include the following text to the 11bn SFD: - 11bn will define coordinated spatial re-use - Coordinated spatial reuse may optionally include spatial nulling • Yes • No Submission Slide 10 Rainer Strobel, MaxLinear

  11. March 2024 doc.: IEEE 802.11-24/0635r0 References [1] Rainer Strobel et.al.,”Coordinated Spatial Nulling (C-SN) Concept”, IEEE 802.11-24/0011r0 [2] Rainer Strobel et.al.,”Coordinated Spatial Nulling (C-SN) Simulations”, IEEE 802.11-24/0012r0 [3] Sigurd Schelstraete et.al., “Nulling and coordinated beamforming” IEEE 802.11-19/0638 [4] Rainer Strobel, “Multi-AP Simulations: follow-up”, IEEE 802.11-23/1843r0 Submission Slide 11 Rainer Strobel, MaxLinear

  12. March 2024 doc.: IEEE 802.11-24/0635r0 APPENDIX Submission Slide 12 Rainer Strobel, MaxLinear

  13. March 2024 doc.: IEEE 802.11-24/0635r0 Simulation parameters Value Parameter TX/RX Antennas 4/2 APs/STAs 2/4 (2 STAs per AP) Spatial streams 1 or 2 (optimized) Bandwidth 160 MHz AP TX Power 21 dBm Channel model D NLOS [8] MCS 0-13 (optimized) Frequency 5.25GHz GI 1.6µs TX/RX SNR 41dB/43dB Channel aging/Doppler 1.2km/h, 6Hz BF quantization ideal Precoder type ZF (HC), MMSE (FC) Sounding interval 100ms (SU), 10ms (MU) Overhead Sounding and MAC overhead not considered SU time allocation 25% for each STA MU allocation 2 STAs served by one AP 50% time for per AP Submission Slide 13 Rainer Strobel, MaxLinear

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