Discussion on RU Allocation Subfield in IEEE 802.11-20/0609r2 Document

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Explore the detailed discussion on RU allocation subfield in the IEEE 802.11-20/0609r2 document, focusing on aspects like MRU indication, 11ax RU allocation subfield, feasibility of an 8-bit table for 11be, and MU-MIMO support for single RU users. Various contributions from industry experts are highlighted for a comprehensive understanding of the topic.

  • IEEE
  • RU Allocation Subfield
  • 802.11-20/0609r2
  • Document
  • Discussion
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  1. Apr 2020 doc.: IEEE 802.11-20/0609r2 Further discussion on RU allocation subfield in EHT-SIG Date: 2020-04-16 Authors: Affiliations Address Phone email Name Ross Jian Yu ross.yujian@huawei.com Huawei Mengshi Hu Huawei Ming Gan Huawei Oded Redlich Huawei Shimi Shilo Huawei Genadiy Tsodik Huawei Submission Slide 1 Ross Jian Yu, et al Huawei Technologies

  2. Apr 2020 doc.: IEEE 802.11-20/0609r2 Introduction and recap Several contributions have talked about MRU indication using RU allocation subfield in EHT-SIG: https://mentor.ieee.org/802.11/dcn/20/11-20-0578-00-00be-on-ru-allocation- singling-in-eht-sig.pptx (Jianhan Liu, Mediatek) https://mentor.ieee.org/802.11/dcn/20/11-20-0373-01-00be-ru-allocation-subfield- design-for-multi-ru-support.pptx (Myeongjin Kim, Samsung) https://mentor.ieee.org/802.11/dcn/20/11-20-0403-00-00be-signaling-of-multiple- ru-aggregation-in-ofdma.pptx (Dongguk Lim, LGE) https://mentor.ieee.org/802.11/dcn/20/11-20-0400-00-00be-multi-ru-combination- and-signaling-for-ofdma-transmission.pptx (Mengshi Hu, Huawei) The contributions have merged a solution to use an enhanced table for RU allocation for both single RU and multi-RU. This contribution further discusses several aspects regarding the detailed signaling, and talks about the pro and con. Submission Slide 2 Ross Jian Yu, et al Huawei Technologies

  3. Apr 2020 doc.: IEEE 802.11-20/0609r2 Recap of 11ax RU allocation subfield The RU allocation subfield in 11ax spec is an 8-bit look-up table. Whilst it can also be indicated through Hierarchical Indication RU allocation signaling without referring to a 8-bit look-up table (15-1335r2) 52 reserved entries so far Submission Slide 3 Ross Jian Yu, et al Huawei Technologies

  4. Apr 2020 doc.: IEEE 802.11-20/0609r2 Feasibility of an 8-bit table for 11be There was concern about an even bigger RU allocation table for 11be. This proposal wants to discuss the feasibility of an 8-bit table also for 11be. Several aspects are considered: MU-MIMO support for small and big single RU/MRU respectively Number of entries needed if MU-MIMO is supported for MRU An high efficient way to support MU-MIMO for big MRU EHT-SIG Common field User Specific field 8 bits Center-26- tone RU indication RU Allocation subfield N RU Allocation subfield 1 RU Allocation subfield 2 ... CRC Tail ... User field User field CRC Tail User field User field CRC Tail Padding One user only has one User field, even if it is a multi-RU user. Submission Slide 4 Ross Jian Yu, et al Huawei Technologies

  5. Apr 2020 doc.: IEEE 802.11-20/0609r2 MU-MIMO support for single RU For single RU, the number of entries needed for different size are shown below: Single RU size Number of entries needed MU-MIMO with 8 entries MU-MIMO with 16 entries Gap 106 10*8 10*16 80 106+26+106 64 256 192 242, 484, 996, 3*8 3*16 24 2*996 8 16 8 106 - 106 Support up to 4 users per 106 so far to reduce number of entries, not considered to expand so far Considering the applicable scenario, the entries overhead and the benefits, it is proposed to keep 106-tone RU with up to 8 entries. Submission Slide 5 Ross Jian Yu, et al Huawei Technologies

  6. Apr 2020 doc.: IEEE 802.11-20/0609r2 MU-MIMO support for single RU For large RUs that are larger than 242-tone RU, two ways can be used for supporting up to 16 MU-MIMO users Opt1: 8 entries per RU allocation subfield: as 11ax, the number of MU-MIMO users is the sum of the user fields indicated in two RU allocation subfields within two CCs, for example: RU allocation subfield 1 indicates 484 (6) in CC1 and RU allocation subfield 2 indicates 484 (7) in CC2. The number of MU-MIMO users is 13 in the 484-tone RU. Pro: fewer number of entries needed Con: cannot support more than 8 MU-MIMO users for 242-tone RU; cannot support full flexibility regarding EHT-SIG CC load balance. Opt2: 16 entries per RU allocation subfield Pro: can support more than 8 MU-MIMO users for 242-tone RU, full flexibility regarding EHT-SIG CC load balance Con: larger number of entries needed Considering the applicable scenario, the entries overhead and the benefits, it is preferred to have 8 entries (up to 16 users) for RUs that are larger than 242-tone RU. 242-tone RU case is open for discussion. Submission Slide 6 Ross Jian Yu, et al Huawei Technologies

  7. Apr 2020 doc.: IEEE 802.11-20/0609r2 MU-MIMO support for small MRU For small MRUs, the number of entries needed for MRU are shown as follows: MRU size Number of entries needed without MU-MIMO in both single RU and MRU MU-MIMO with 8 entries MU-MIMO with 16 entries 52+26 8 8 8 52+26 and 52+26 1 1 1 52+26 and 106 2 16 32 52+26 and 106+26 2 16 32 106+26 8 64 128 106+26 and 106 2 128 512 Total 23 233 713 Submission Slide 7 Ross Jian Yu, et al Huawei Technologies

  8. Apr 2020 doc.: IEEE 802.11-20/0609r2 MU-MIMO support for small MRU Small MRU is an optional feature ODFMA + MU-MIMO is an optional feature and seldom implemented. OFDMA + MU-MIMO in 106-tone RU is even less attracting compared with OFDMA + MU-MIMO in large RU. So supporting MU-MIMO for small MRU is trying to support an optional feature on top of another optional and seldom implemented feature. Can be simply replaced by doing MU-MIMO in 106-tone RU or 242-tone RU Considering the applicable scenario, the entries overhead and the benefits, it is preferred to not support MU-MIMO for small RU when small MRU exists within one 242-tone RU. Submission Slide 8 Ross Jian Yu, et al Huawei Technologies

  9. Apr 2020 doc.: IEEE 802.11-20/0609r2 RU allocation subfield Entries for Small MRU RU Allocation subfield ( B7 B6 B5 B4 B3 B2 B1 B0) Number of entries #1 #2 #3 #4 #5 #6 #7 #8 #9 232 26 26 26 26 26 52+26 multi-RU 26 1 233 26 26+52 multi-RU 26 26 26 26 26 1 234 26 26+52 multi-RU 26 26 26 52 1 235 26 26+52 multi-RU 26 52 26 26 1 236 26 26 52 26 52+26 multi-RU 26 1 237 26 26+52 multi-RU 26 52+26 multi-RU 26 1 238 26 26 52 26 52 52 1 239 26 26+52 multi-RU 26 52 52 1 240 52 26 26 26 52+26 multi-RU 26 1 241 52 52 26 52+26 multi-RU 26 1 242 26 26 26 26 26+106 multi-RU 1 243 26 26+52 multi-RU 26 106 1 244 26 26 52 26+106 multi-RU 1 245 26 26+52 multi-RU 26+106 multi-RU 1 246 52 26 26 26 106 1 247 52 26 26 26+106 multi-RU 1 248 52 52 26+106 multi-RU 1 249 106+26 multi-RU 26 26 26 26 1 250 106+26 multi-RU 26 26 52 1 251 106+26 multi-RU 52 26 26 1 252 106 26 26+52 multi-RU 26 1 253 106+26 multi-RU 26+52 multi-RU 26 1 254 106+26 multi-RU 52 52 1 23 entries in total Submission Slide 9 Ross Jian Yu, et al Huawei Technologies

  10. Apr 2020 doc.: IEEE 802.11-20/0609r2 MU-MIMO support for large MRU For large MRUs, the number of entries needed for MRU are shown as follows if assuming the exact MRU combinations can be indicated through a single RU allocation subfield: MRU size (OFDMA case) Number of entries needed without MU-MIMO in both single RU and MRU MU-MIMO with 9 entries (including zero user fields) MU-MIMO with 17 entries (including zero user fields) 242+484 4 36 68 484+996 4 36 68 3*996 4 36 68 Total 12 108 204 MU-MIMO support can be more useful for large MRU compared with small MRU. It is preferred to support MU-MIMO for large MRU. Whilst the overhead is pretty big, which would lead to a larger table. Submission Slide 10 Ross Jian Yu, et al Huawei Technologies

  11. Apr 2020 doc.: IEEE 802.11-20/0609r2 Large MRU indication with 9 entries 108 or 204 entries are consumed by large RU combinations shown in the previous slide assuming one RU allocation subfield itself is enough for the exact location of MRU. An alternative way for large MRU indication was introduced in 400r0, which needs only 9 or 17 entries, only 1/12 overhead of the above cases. 113 242-tone RU empty (with zero users) 484-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 996-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 2*996-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield Belongs to an MRU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 1 114 1 115 1 116 1 117 1 192-199 200-207 208-215 216-223 242 484 996 2*996 8 8 8 8 Belongs to an MRU; contributes 1~8 User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 224-231 8 9 new entries for single RU 2*996 9 new entries for MRU Submission Slide 11 Ross Jian Yu, et al Huawei Technologies

  12. Apr 2020 doc.: IEEE 802.11-20/0609r2 Large MRU indication with 9 entries The RU allocation subfields fall within any MRU combinations in an OFDMA transmission shall be set to one of the 9 values. The Rx knows the location and size of the MRU by counting all the RU allocation subfields with the 9 values. 113 242-tone RU empty (with zero users) 484-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 996-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 2*996-tone RU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield Belongs to an MRU; contributes zero User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 1 114 1 115 1 116 1 117 1 192-199 200-207 208-215 216-223 242 484 996 2*996 8 8 8 8 Belongs to an MRU; contributes 1~8 User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield 224-231 8 11 reserved entries left: 118-119, 120-127, 255 Submission Slide 12 Ross Jian Yu, et al Huawei Technologies

  13. Apr 2020 doc.: IEEE 802.11-20/0609r2 Some Examples N(x) to indicate the newly added entries with x user fields. Different colors mean different combinations for large RU. After Reading all the RU allocation subfields of the same color, the STA knows the RUs of the same color are assigned 484+996 has to be within one 160Mhz boundary 242+484 has to be within one 80MHz boundary 2 MU-MIMO users 1 user 484 484 996 996 242 242 484 Example A Enhanced RU allocation subfields CC1 else N(1) N(0) N(0) else N(0) else else CC2 else N(1) N(0) N(0) N(1) N(0) else else 2 MU-MIMO users 1 user 1 user 484 484 996 242 242 484 484 242 242 Example B CC1 else N(1) N(0) N(0) N(1) N(0) N(0) N(0) CC2 else N(1) N(0) N(0) else N(0) N(1) else Submission Slide 13 Ross Jian Yu, et al Huawei Technologies

  14. Apr 2020 doc.: IEEE 802.11-20/0609r2 Overhead Comparison and Analysis In 20-578r0, 20-715r0, 11ax style RU allocation has shown up to 50% efficiency gain regarding the number of EHT-SIG symbols. In 11be, the data rate can be 46.8 Gbps per link as shown in 19-754r0. The duration of the data part can be relatively short considering the latency requirement and traffic pattern. Correspondly, it is important to ensure a smaller number of EHT-SIG symbols. In 20-575r0, it has been shown the overhead for 11ax style RU allocation is larger when number of users in the PPDU is small mainly due to the overhead of the common field. Whilst several members show interests to further reduce the overhead of the common field. Regarding implementation complexity of 11ax style RU allocation, since 11ax has already implemented it, it is straightforward for 11be to further implement it. Submission Slide 14 Ross Jian Yu, et al Huawei Technologies

  15. Apr 2020 doc.: IEEE 802.11-20/0609r2 Summary Feasibility of an 8-bit table for 11be is proved in this proposal. 52 reserved entries in 11ax. Among them, 23 are used for small MRU, 9 for 2*996 single RU, 9 for large MRU. 11 reserved entries are for other purposes. The proposal analyzes the tradeoff between supporting MU-MIMO for different RU sizes. The proposed method enables MU-MIMO for MRU with only 9 few entries. Submission Slide 15 Ross Jian Yu, et al Huawei Technologies

  16. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #1 Do you agree to add the following to the 11be SFD: An RU Allocation subfield that is present in the Common field of the EHT-SIG field of an EHT PPDU sent to multiple users, indicates RU assignment, including the size of the RU(s) and their placement in the frequency domain, to be used in the EHT modulated fields of the PPDU in the frequency domain. Compressed modes are TBD. Yes/No/Abstain Submission Slide 16 Ross Jian Yu, et al Huawei Technologies

  17. Apr 2020 doc.: IEEE 802.11-20/0609r2 Discussion regarding SP1 Note in 11ax specs, we have the following description: Each RU Allocation subfield in an HE-SIG-B content channel corresponding to a 20 MHz frequency segment indicates the RU assignment, including the size of the RU(s) and their placement in the frequency domain, to be used in the HE modulated fields of the HE MU PPDU in the frequency domain, also indicates information needed to compute the number of users allocated to each RU, where the subcarrier indices of the RU(s) meet the conditions in Table 27-25 (RUs associated with each RU Allocation subfield for each HESIGB content channel and PPDU bandwidth). We also have the following passed motion in 11be: An RU Allocation subfield is present in the Common field of the EHT-SIG field of an EHT PPDU sent to multiple users. Compressed modes are TBD. Contents of the RU Allocation subfield are TBD. [Motion 57, [9] and [25]] Submission Slide 17 Ross Jian Yu, et al Huawei Technologies

  18. Apr 2020 doc.: IEEE 802.11-20/0609r2 SP2 Do you agree that the mapping from the TBD-bit RU Allocation subfield to the RU assignment, contains the following entries: The RUs highlighted in orange means combination. Table XX - RU Allocation subfield Cont d Number of entries 1 order #1 #2 #3 #4 #5 #6 #7 #8 #9 Number of entries order #1 #2 #3 #4 #5 #6 #7 #8 #9 TBD 26 26 26 26 26 26 26 26 26 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 52 26 26 26 26 1 1 1 1 1 1 1 1 1 TBD TBD TBD TBD TBD TBD 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 52 1 1 1 1 1 1 52 52 52 52 52 52 26 26 26 26 52 52 26 26 52 52 52 52 52 52 52 52 26 26 26 26 26 26 52 52 52 26 26 26 26 26 26 52 52 26 26 TBD 26 26 52 26 52 52 1 52 52 52 26 26 26 26 26 26 TBD 52 26 26 26 26 26 26 26 1 52 TBD 52 26 26 26 26 26 52 1 26 26 26 26 26 26 26 26 26 26 106 106 106 106 106 106 TBD 1 TBD TBD TBD TBD TBD TBD TBD 1 TBD TBD TBD TBD TBD 52 26 26 26 52 26 26 1 52 52 52 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD 52 52 52 52 52 52 26 26 26 26 26 26 26 -- -- 26 26 26 26 26 26 26 26 -- -- 52 52 1 1 1 1 1 52 52 52 52 52 26 26 26 26 26 26 52 52 52 26 26 52 52 26 26 52 52 106 106 106 106 106 106 106 106 26 26 26 26 26 26 106 TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD TBD 1 1 TBD TBD TBD TBD TBD 52 106 52 52 26 26 26 26 26 26 106 106 106 106 52 52 52 52 26 26 26 26 26 26 52 52 52 26 26 52 52 106 106 106 106 106 26 26 26 26 26 26 106 106 52 52 52 26 26 52 106 52 52 242-tone RU empty (with zero users) 26 242 484 996 2*996 52 52 106 106 Submission Slide 18 Ross Jian Yu, et al Huawei Technologies

  19. Apr 2020 doc.: IEEE 802.11-20/0609r2 Discussion regarding SP2 Discussion: Now there is argument regarding MU-MIMO support for 106-tone RU, 132-tone RU, number of entries for MU-MIMO support (8 or 16), large MRU indication method. The entries in the table now try to avoid those controversial parts. Submission Slide 19 Ross Jian Yu, et al Huawei Technologies

  20. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #3 Do you agree that when MRU exists within a 242-tone RU range, MU-MIMO shall not be supported within the 242-tone RU range? Submission Slide 20 Ross Jian Yu, et al Huawei Technologies

  21. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #4 Do you agree that when no MRU exists within a 242- tone RU range, if there exists one or two 106-tone RU within the 242-tone RU range, up to 8 MU-MIMO users is supported within one 106-tone RU? Yes/No/Abstain Submission Slide 21 Ross Jian Yu, et al Huawei Technologies

  22. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #5 Do you agree that for RU484 or RU996, in the RU allocation table, 9 entries per RU size will be used to indicate: contributes 0~8 User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield? Yes/No/Abstain Submission Slide 22 Ross Jian Yu, et al Huawei Technologies

  23. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #6 Do you agree that for RU 2*996, in the RU allocation table, 9 entries per RU size will be used to indicate: contributes 0~8 User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield? Yes/No/Abstain Submission Slide 23 Ross Jian Yu, et al Huawei Technologies

  24. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #7 Do you agree that for RU242, in the RU allocation table, 9 entries per RU size will be used to indicate: contributes 0~8 User fields to the User Specific field in the same EHT-SIG content channel as this RU Allocation subfield? Yes/No/Abstain Submission Slide 24 Ross Jian Yu, et al Huawei Technologies

  25. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #8 Do you agree that for large multi-RU, 9 entries will be used to indicate: belongs to an MRU, contributes 0~8 User fields to the User Specific field in the same EHT- SIG content channel as this RU Allocation subfield? Yes/No/Abstain Submission Slide 25 Ross Jian Yu, et al Huawei Technologies

  26. Apr 2020 doc.: IEEE 802.11-20/0609r2 Straw Poll #9 Do you agree that one RU allocation subfield is 8 bit in the common field of an EHT-SIG for single RU and multi-RU indication in a DL OFDMA transmission? Yes/No/Abstain Submission Slide 26 Ross Jian Yu, et al Huawei Technologies

  27. Apr 2020 doc.: IEEE 802.11-20/0609r2 References https://mentor.ieee.org/802.11/dcn/20/11-20-0578-00-00be-on-ru- allocation-singling-in-eht-sig.pptx (Jianhan Liu, Mediatek) https://mentor.ieee.org/802.11/dcn/20/11-20-0373-01-00be-ru- allocation-subfield-design-for-multi-ru-support.pptx Kim, Samsung) https://mentor.ieee.org/802.11/dcn/20/11-20-0403-00-00be- signaling-of-multiple-ru-aggregation-in-ofdma.pptx (Dongguk Lim, LGE) https://mentor.ieee.org/802.11/dcn/20/11-20-0400-00-00be-multi-ru- combination-and-signaling-for-ofdma-transmission.pptx Hu, Huawei) https://mentor.ieee.org/802.11/dcn/15/11-15-1335-02-00ax-he-sig-b- contents.pptx (Le Liu, Huawei) https://mentor.ieee.org/802.11/dcn/20/11-20-0715-00-00be- overhead-comparisons-of-eht-sig.pptx (Myeongjin Kim, Samsung) (Myeongjin (Mengshi Submission Slide 27 Ross Jian Yu, et al Huawei Technologies

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