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Efficient Preamble Puncture Indication Methods for Non-OFDMA Transmission in IEEE 802.11

This document discusses efficient methods for indicating preamble puncture patterns for non-OFDMA transmission in IEEE 802.11 standards. It outlines various puncture patterns, including bitmap and RU segment options, to optimize spectrum resource utilization in high-density scenarios. The proposed methods aim for flexibility, straightforward implementation, and efficient spectrum resource usage without the need for complex look-up tables.

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Efficient Preamble Puncture Indication Methods for Non-OFDMA Transmission in IEEE 802.11

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  1. March 2020 Preamble puncture indication for non-OFDMA transmission Date: 2020-03-13 Authors: doc.: IEEE 802.11-20/0401r0 Affiliations Address Phone email Name Ross Jian Yu ross.yujian@huawei.com Huawei Yan Xin Huawei Mengshi Hu Huawei Ming Gan Huawei Rob Sun Huawei Junghoon Suh Huawei Osama Aboul-Magd Huawei Submission Slide 1 Ross Jian Yu, et al Huawei Technologies

  2. March 2020 doc.: IEEE 802.11-20/0401r0 Introduction and Recap RU allocation subfield is not needed for non-OFDMA transmission, • including both SU and MU-MIMO transmissions. For punctured non-OFDMA transmissions, MRU aggregation • indication is equivalent to preamble puncture indication. In [1], the author has a very good summary of the punctured patterns • that have passed the motion so far. And provide 3 options for preamble puncture indication. In this contribution, we will share our view on how to indicate • preamble puncture information for non-OFDMA cases. Submission Slide 2 Ross Jian Yu, et al Huawei Technologies

  3. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture patterns As mentioned in [1], the following patterns have passed the motion assuming P20 is not punctured: • Mode Aggregate d BW Description 1-6 (6) 20/40/80/80+80 or 160/240 or 160+80/160+160 or 320 7-9 (3) 60MHz 1x11, 11x1, 111x 10-12 (3) 120MHz 11xx1111, 1111xx11, 111111xx 13-19 (7) 140MHz 1x111111, 11x11111, …, 1111111x 20-21(2) 160Mhz 1111 xxxx1111, 1111 1111 xxxx 22-26(5) 200Mhz 11xx 1111 1111, 1111 xx11 1111, …, 1111 1111 11xx 27-29(3) 240Mhz 1111 xxxx1111 1111, 1111 1111 xxxx 1111, 1111 1111 1111 xxxx 30-36 (7) 280MHz 11xx 1111 1111 1111, …, 1111 1111 1111 11xx Submission Slide 3 Ross Jian Yu, et al Huawei Technologies

  4. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture patterns There are several other mode with one hole or two holes[2-3], which we • think are also very important for high dense scenarios [4], or 6GHz or DFS channels. PPDU BW Agg. BW Combinations Notes 80 MHz 40 20+20 (1xx1) 40+(40+20) One hole of 40MHz 160 MHz 100 One hole of 60 MHz Two holes: 40 MHz and 20 MHz 120 (20+20)+80 One hole of 40 MHz (40+20)+(40+20) One hole of 40 MHz Two holes of 20 MHz each One hole of 20MHz Two holes: 20 MHz each One hole: 40 MHz Two Holes: 40MHz and 20Mhz One hole: 60MHz 240 MHz 220 200 140+80 140+60 180 120+60 and 140+40 Submission Slide 4 Ross Jian Yu, et al Huawei Technologies

  5. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture patterns More modes: • PPDU BW 320 MHz Agg. BW 300 Combinations Notes 160+140 One hole of 20MHz 280 140+140 Two 20 MHz holes One 40MHz hole Two holes: 20 and 40MHz; One hole: 60 MHz Two holes: 40MHz each One hole: 80 MHz 260 140+120 and 160+100 240 120+120 Hence, a indication method which can support a more flexible and • efficient usage of spectrum resource with simple implementation on the indication of puncture patterns is preferred. Submission Slide 5 Ross Jian Yu, et al Huawei Technologies

  6. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication Opt1: bitmap - a most flexible and straightforward method • 16-bit, 12-bit and 8-bit bitmaps for respective 320MHz, 240MHz and 160 MHz BWs unavailable 20MHz spectrum shall not cross the 20MHz channel boundary 484-tone RUs shall not cross the 40MHz and 80MHz boundaries 996-tone RUs shall not cross the 80MHz boundary RUs to be aggregated are indicated in a straightforward way with simple implementation. No look-up table is needed to be implemented and stored to indicate flexible RU combinations. Examples of bit map indication are shown as below: – – – – – one hole of 20 MHz in 320 MHz (bit map: 10111111111111) 1 0 1 1 1 – 1 1 1 1 1 1 1 1 1 1 1 Bit map RU 242 484 996 996 996 aggregation 80 MHz 80 MHz 80 MHz 80 MHz – two holes of 20 MHz and 40 MHz in 320 MHz (bit map: 1011001111111111) 1 0 1 1 0 0 1 1 1 1 1 1 1 1 1 1 Bit map RU 996 242 484 484 996 aggregation 80 MHz 80 MHz 80 MHz 80 MHz Submission Slide 6 Ross Jian Yu, et al Huawei Technologies

  7. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication Opt2: RU segment - another flexible and straightforward method • RU aggregation can be indicated with a series of RU segments in an order, which are arranged from the start to the end of the operating channel bandwidth. Each RU segment represents a 242-, 484- or 996-tone RU. RU availability RU size Bit representation for RU segment Unavailable 242 00 Available 242 01 Available 484 10 Available 996 11 - 16-bit, 14-bit and 12-bit bitmaps for respective 320MHz, 240MHz and 160 MHz BWs - unavailable 20MHz spectrum shall not cross the 20MHz channel boundary - 448-tone and 996-tone RUs shall not cross the 80MHz boundary - RU segment indication is per 80 MHz basis. Indication of RU aggregation for bandwidth larger than 80 MHz (e.g., 320 MHz) can be a concatenation of indications for 80 MHz. - RUs to be aggregated are indicated in a straightforward way with simple implementation. Only a two-bit RU segment indication table is needed for flexible RU combinations. Submission Slide 7 Ross Jian Yu, et al Huawei Technologies

  8. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication Opt2: RU segment - another flexible and straightforward method (cont’d) Examples of RU segment indication are shown as below:. - One hole of 20 MHz in 320 MHz (16-bit representation: 0100101111110000) • Bit rep. 01 00 10 11 11 11 0000 Seg1 Seg2 Seg3 Seg4 Seg5 Seg6 Segmentation RU 242 484 996 996 996 aggregation 80 MHz 80 MHz 80 MHz 80 MHz - Two holes of 20 MHz each in 320 MHz (16-bit representation: 0001101110010011) Bit rep. 00 01 10 11 10 01 00 11 Segmentation Seg6 Seg7 Seg1 Seg2 Seg3 Seg4 Seg5 Seg8 RU 484 996 996 242 484 242 aggregation 80 MHz 80 MHz 80 MHz 80 MHz - One hole of 60 MHz in 320 MHz (16-bit representation: 1111010000001100) Bit rep. 11 11 01 00 00 00 11 00 Seg1 Seg2 Seg3 Seg4 Seg5 Seg6 Seg7 Segmentation RU 996 996 996 242 aggregation 80 MHz 80 MHz 80 MHz 80 MHz Submission Slide 8 Ross Jian Yu, et al Huawei Technologies

  9. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication Opt3: Since RU allocation subfield has 8 bit, a method would be use this 8 • bit to indicate the puncture pattern. The following method is proposed, there exists two subfields, each one is • used to indicate one punctured hole in one of the 160MHz: Description Entries Description Entries Puncture indication for 1st160Mhz (4 bit) Puncture indication for 2st160Mhz (4 bit) 20MHz is punctured 20MHz is punctured 8 8 0-7 0-7 40MHz is punctured 40MHz is punctured 4 4 8-11 8-11 80MHz is punctured 80MHz is punctured 2 2 12-13 12-13 No puncture No puncture 1 1 14 14 Reserved Reserved 1 1 15 15 An example is shown as below: • Indication: 1 0000 0010 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 Bit map RU 484 996 484 996 242 242 aggregation 80 MHz 80 MHz 80 MHz 80 MHz Submission Slide 9 Ross Jian Yu, et al Huawei Technologies

  10. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication The two table method allows a very simple logic/very small-size tables. And • the preamble puncture indication occupies the same bits as the RU allocation subfield. The two table can also be used for 160MHz and 80MHz separately when • BW=240MHz, and for 80MHz and 80MHz when BW=160MHz. Description Description Entries Entries Puncture indication for 1st80Mhz (4 bit) Puncture indication for 2st80Mhz (4 bit) 242-tone RU is punctured 242-tone RU is punctured 4 4 0-3 0-3 484-tone RU is punctured (including middle 484-tone RU) 996-tone RU is punctured 484-tone RU is punctured (including middle 484-tone RU) 996-tone RU is punctured 3 3 4-6 4-6 1 1 7 7 No puncture No puncture 1 1 8 8 Reserved Reserved 7 7 9-15 9-15 Submission Slide 10 Ross Jian Yu, et al Huawei Technologies

  11. March 2020 doc.: IEEE 802.11-20/0401r0 Preamble puncture indication The proposed method can be used for both EHT-SIG and trigger frame: • 11be L-STF L-LTF L-SIG RL-SIG U-SIG EHT-SIG ... Data Non- OFDMA ... ... BW ... EHT-SIG common EHT-SIG user specific RU allocation subfield/ Preamble puncture indication subfield ... User 1 ... User M Punctured RU Table 1 Punctured RU Table 2 AID NSTS .. ... Common field User specific field Trigger type Non- OFDMA User 1 ... User M ... ... BW ... RU allocation subfield/ Preamble puncture indication subfield AID MCS NSTS ... Punctured RU Table 1 Punctured RU Table 2 Submission Slide 11 Ross Jian Yu, et al Huawei Technologies

  12. March 2020 doc.: IEEE 802.11-20/0401r0 Summary Three simple methods for preamble puncture indication are considered. • Bitmap is the most flexible and straightforward indication method. • RU segment approach uses a multiple of 2 bits to indicate the • available/unavailable RU segments per 80 MHz basis. The two table method allows a very simple logic/very small-size tables. • And the preamble puncture indication occupies the same bits as the RU allocation subfield. Submission Slide 12 Ross Jian Yu, et al Huawei Technologies

  13. March 2020 doc.: IEEE 802.11-20/0401r0 Straw Poll #1 • Do you support for 11be, there shall exist at least one puncture pattern with two holes across the PPDU bandwidth? Submission Slide 13 Ross Jian Yu, et al Huawei Technologies

  14. March 2020 doc.: IEEE 802.11-20/0401r0 Straw Poll #2 • Do you support the preamble puncture indication method as follows? – There exists two subfields, when BW =320Mhz, each one is used to indicate one punctured hole in one of the 160MHz; – when BW = 240Mhz, one is used to indicate one punctured hole in the 160MHz, the other is used to indicate one punctured hole in the other 80Mhz; – when BW = 160Mhz, each one is used to indicate one punctured hole in one of the 80MHz. Submission Slide 14 Ross Jian Yu, et al Huawei Technologies

  15. March 2020 doc.: IEEE 802.11-20/0401r0 Straw Poll #3 • Do you support the bitmap method described above for RU aggregation indication? – Y – N – A Submission Slide 15 Ross Jian Yu, et al Huawei Technologies

  16. March 2020 doc.: IEEE 802.11-20/0401r0 Straw Poll #4 • Do you support the RU segment method described above for RU aggregation indication? – Y – N – A Submission Slide 16 Ross Jian Yu, et al Huawei Technologies

  17. March 2020 doc.: IEEE 802.11-20/0401r0 References [1] 11-20-0285-01-00be-su-ppdu-sig-contents-considerations [2] 11-20-0048-00-00be-ru-aggregation-for-240mhz-and-320mhz [3] 11-19-1908-04-00be-multi-ru-support [4] 11-19-1190-03-00be-improved-preamble-puncturing-in-802-11be Submission Slide 17 Ross Jian Yu, et al Huawei Technologies

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