Improving Frequency Utilization Efficiency in Wireless Networks
Extra dRUs, created by distributing tones of rRUs, can enhance signal power and SNR in wireless networks. By optimizing tone distribution, the frequency resource utilization efficiency in 40 and 80 MHz PPDUs can be significantly improved, leading to better network performance. This document outlines the construction and benefits of extra dRUs in wireless communication systems.
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May 2024 doc.: IEEE 802.11-24/0790r0 Extra dRUs Construction Date: 2024-05-11 Authors: Name Zhi Mao Affiliations Address Phone email maozhi3@huawei.com Chenchen Liu Ross Jian Yu Huawei Technologies, Co. LTD. Mengshi Hu Bo Gong Yue Zhao Ming Gan Submission Slide 1 Zhi Mao, Huawei
May 2024 doc.: IEEE 802.11-24/0790r0 Introduction A DRU is constructed by distributing tones of a rRU[1-3]. Then, the Tx power per tone can be boosted and SNR can be increased. The dRU hierarchical structure can follow the same rules as in the rRU case[2], i.e., a larger dRU is formed by combining several smaller dRUs. For example, 52-tone dRU 1 is formed by combining 26-tone dRU 1 and 2. However, some dRU tone plan designs are with low utilization efficiency. For example, the utilization efficiency of a 52-tone dRU is 86.0% (52*8/484) in a 40 MHz PPDU. About 14% frequency resource is wasted. dRU logical structure in 40 MHz PPDU 2 3 4 5 6 7 2 / 1 1 26-tone dRU 52-tone dRU 106-tone dRU 242-tone dRU 484-tone dRU 1 8 9 10 11 12 13 14 15 16 17 18 5 6 3 1 3 4 7 8 / 2 4 2 1 Submission Slide 2 Zhi Mao, Huawei
May 2024 doc.: IEEE 802.11-24/0790r0 Extra dRU in 40 MHz PPDU In a 40 MHz PPDU, if tones of a dRU are distributed evenly[2], then The tone separation distance of a 26-tone dRU is 18 The tone separation distance of a 52-tone dRU is 9 Based on that observation, there can be at most nine 52-tone dRUs in a 40 MHz PPDU. Eight of them follow the same indexing as rRUs, and The extra 52-tone dRU should be allocated a new dRU index. The extra (9th) 52-tone dRU can be formed by combining 26-tone dRU 5 and 14. Updated dRU logical structure in 40 MHz PPDU 26-tone dRU 1 2 3 4 5 52-tone dRU 1 2 9 106-tone dRU 1 / 242-tone dRU 1 484-tone dRU 6 7 8 9 10 11 12 13 14 9 / 2 15 16 17 18 3 4 5 6 7 8 2 3 4 1 Based on the tone plan in [1], the tone indices of the 52-tone dRU 9 are: [-234:9:-9, 18:9:243] 1 0.5 0 -250 -200 -150 -100 -50 0 50 100 150 200 250 The power boost gain of the novel 9th 52-tone dRU is the same as other same-size dRUs in 40 MHz PPDU. Submission Slide 3 Zhi Mao, Huawei
May 2024 doc.: IEEE 802.11-24/0790r0 Extra dRUs in 80 MHz PPDU In a 80 MHz PPDU, if tones of a dRU are distributed evenly[2], then The tone separation space of a 26-tone dRU is 36. The max number of 26-tone dRU is 36 The tone separation space of a 52-tone dRU is 18. The max number of 52-tone dRU is 18 The tone separation space of a 106-tone dRU is 9. The max number of 106-tone dRU is 9 Note: 26-tone dRU may not be defined. In an 80 MHz PPDU, The first extra (17th) 52-tone dRU can be formed by combining 26-tone dRU 5 and 14. The second extra (18th) 52-tone dRU can be formed by combining 26-tone dRU 24 and 33. The extra (9th) 106-tone dRU can be formed by combining 52-tone dRU 17, 18 and 2 extra tones. Updated dRU logical structure in 40 MHz PPDU 12 13 14 15 16 6 17 7 3 9 4 2 26-tone dRU 52-tone dRU 106-tone dRU 242-tone dRU 484-tone dRU 996-tone dRU 1 2 3 4 5 6 7 8 9 10 11 17 18 19 20 21 22 23 24 18 9 3 25 26 27 28 29 30 31 32 33 18 9 4 34 35 36 37 1 2 17 9 1 3 4 5 8 9 10 11 12 13 14 15 16 1 2 5 6 7 8 / 1 2 1 The power boost gain of the extra dRUs may be different from that of other same-size dRUs in 80 MHz PPDU. Slide 4 Submission Zhi Mao, Huawei
May 2024 doc.: IEEE 802.11-24/0790r0 Summary Extra dRUs can improve the frequency utilization efficiency in 40 and 80 MHz PPDUs. In this contribution, we proposed methods of constructing extra dRUs. In a 40 MHz PPDU, 1 extra 52-tone dRU are defined; In an 80 MHz PPDU, 2 extra 52-tone dRUs and 1 extra 106-tone dRU are defined. Submission Slide 5 Zhi Mao, Huawei
May 2024 doc.: IEEE 802.11-24/0790r0 References [1] 11-24-0468-01-00bn-dru-tone-plan-for-11bn [2] 11-23-2021-01-00bn-principle-and-methodology-for-dru-tone-plan-design [3] 11-23-1988-01-00bn-considerations-on-dru-design-and-application Submission Slide 6 Zhi Mao, Huawei
