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Thoughts on STF Design for Distributed Resource Unit in IEEE 802.11

The proposal discusses the STF design for DRU in IEEE 802.11, focusing on power measurement accuracy and implementation simplicity. It suggests transmitting STF over the entire distribution bandwidth, global CSD assignment, and reusing existing STF sequences and CSD values. Several key issues and solutions are outlined for effective STF design in DRU scenarios.

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Thoughts on STF Design for Distributed Resource Unit in IEEE 802.11

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  1. May 2024 doc.: IEEE 802.11-24/0749r1 Thoughts on STF Design for DRU Date: 2024-05-10 Authors: Name Bo Gong Chenchen Liu Jian Yu (Ross) Affiliations Address Phone Email gongbo8@huawei.com liuchenchen1@huawei.com Huawei ross.yujian@huawei.com Ming Gan ming.gan@huawei.com Submission Slide 1 Bo Gong (Huawei)

  2. May 2024 doc.: IEEE 802.11-24/0749r1 Introduction For DRU design, we have lots of discussion on transmission mode [1], tone plan [2]-[3] and pilot designs [4]-[5]. • In this proposal, we give some thoughts on STF design for DRU. • Submission Slide 2 Bo Gong (Huawei)

  3. May 2024 doc.: IEEE 802.11-24/0749r1 If inheriting STF transmission for rRU For rRU, the part of STF sequence which falls within the selected rRU is transmitted. Taking STF for TB PPDU in 20MHz as an example, if 26-tone RU6 with tone indexes 17:42 is selected, STF sequence part in the red circle will be transmitted. • 64 104 112 120 80 88 40 48 72 8 16 24 32 56 96 0 26-tone RU6 17:42 Consider that the way of STF transmission for rRU is inherited directly for DRU, which means the part of STF sequence overlapped with DRU is transmitted. Taking STF for TB PPDU in 20MHz as an example, for half of 26-tone DRU with positive tone indexes, STF sequence part in the red circle with tone indexes 48 and 104 will be transmitted. • 96 64 104 112 120 80 88 40 48 72 8 16 24 32 56 0 0 13 22 27 39 48 53 66 76 81 94 104109 26-tone DRU Submission Slide 3 Bo Gong (Huawei)

  4. May 2024 doc.: IEEE 802.11-24/0749r1 If inheriting STF transmission for rRU If the way of STF transmission for rRU is inherited directly for DRU, there exists the following issues. •  For the same size DRUs, the number of tones in STF is not fixed, which increases the implementation complexity;  For some DRUs, the number of tones in STF is too small, which cannot guarantee the power measurement accuracy;  For some DRUs, the intersection of the non-zero tones in STF and Data is null. Taking 26-tone DRUs in 40M as an example. • 26-tone DRU1: [-233 -208 -194 -181 -156 -142 -129 -104 -90 -77 -52 -37 -23 18 33 47 74 89 103 130 145 159 186 201 215 242 ] [-208 -104 ] 26-tone DRU2 : [-232 -206 -180 -154 -128 -50 -36 -22 -8 6 20 34 48 62 76 90 104 118 132 146 160 174 188 202 216 230 ] [-232 -128 -8 48 104 160 216] 26-tone DRU3 : [-219 -193 -167 -141 -115 -49 -35 -21 -7 7 21 35 49 63 77 91 105 119 133 147 161 175 189 203 217 231 ] Null Intersection with Nonzero tone indexes of STF for TB PPDU -240:8:240 Submission Slide 4 Bo Gong (Huawei)

  5. May 2024 doc.: IEEE 802.11-24/0749r1 Principles of STF Design for DRU Guarantee the power measurement accuracy.  Transmit STF in the whole distribution bandwidth.  Apply CSD on per stream of per user to avoid unintended beamforming. • Simplify the implementation as much as possible.  Reuse the current STF sequence, e.g. STF for TB PPDU or STF for MU PPDU.  Reuse the current CSD values. • Submission Slide 5 Bo Gong (Huawei)

  6. May 2024 doc.: IEEE 802.11-24/0749r1 Principles of CSD Design for DRU Conduct global CSD assignment.  For high correlated scenarios, e.g. collocated users and LOS path and so on, it is more safer than local CSD. • Avoid CSD collision as much as possible, e.g., if the number of the required CSD values is smaller than the total number of CSD values, no collision is permitted.  Example-1: Indicate CSD values in trigger frame.  Example-2: Establish a mapping between CSD indexes and DRU user indexes. • Submission Slide 6 Bo Gong (Huawei)

  7. May 2024 doc.: IEEE 802.11-24/0749r1 Summary In this proposal, we share our thoughts on STF design for DRU. On the one hand, whole bandwidth STF transmission and global CSD assignment are proposed to guarantee the accuracy of the power measurement; on the other hand, reusing the current STF sequence and CSD values are considered for simplify the implementation. Submission Slide 7 Bo Gong (Huawei)

  8. May 2024 doc.: IEEE 802.11-24/0749r1 References [1] 11-23-2020-01-00bn-high-level-perspective-on-distributed-tone-ru-for-11bn [2] 11-23-2021-00-00bn-principle-and-methodology-for-dru-tone-plan-design [3] 11-24-0468-01-00bn-DRU tone plan for 11bn [4] 11-24-0501-01-00bn-pilot design considerations for DRU [5] 11-24-0402-01-00bn-20MHz tone plan and pilot design for DRU Submission Slide 8 Bo Gong (Huawei)

  9. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #1 Do you agree to add the following text to the TGbn SFD? - -In UHR-STF for DRU, the current STF tone plan and sequence of 11ax/11be are reused. • Y/N/A: // Note: Some harmonization based on [24/0749r1, 24/0753r1] • • Submission Slide 9 Bo Gong (Huawei)

  10. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #2 Do you agree to add the following text to the TGbn SFD? - -In UHR-STF for DRU, - - STF sequence depends on PPDU BW. - - Occupied STF tones are the same as that of the largest RRU corresponding to the distribution BW within PPDU BW. • Y/N/A: // Note: Some harmonization based on [24/0749r1, 24/0753r1] • • Submission Slide 10 Bo Gong (Huawei)

  11. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #3 Do you agree to add the following text to the TGbn SFD? - In UHR-STF for DRU, CSD is applied to per stream of per user. • Y/N/A: // • Submission Slide 11 Bo Gong (Huawei)

  12. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #4 Do you agree to add the following text to the TGbn SFD? - In UHR-STF for DRU, CSD is assigned to each user globally. • Y/N/A: // • Submission Slide 12 Bo Gong (Huawei)

  13. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #5 Do you agree to add the following text to the TGbn SFD? - In UHR-STF for DRU, current CSD values of 11ac/11ax/11be are reused. • Y/N/A: // • Submission Slide 13 Bo Gong (Huawei)

  14. May 2024 doc.: IEEE 802.11-24/0749r1 Straw Poll #6 Do you agree to add the following text to the TGbn SFD? - In UHR-STF for DRU, if the number of the required CSD values is smaller than the total number of the CSD values, no collision is permitted. • Y/N/A: // • Submission Slide 14 Bo Gong (Huawei)

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