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Tone Grouping Factors and NDP Format for ax

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1 Tone Grouping Factors and NDP Format for 802.11ax
Month Year doc.: IEEE yy/xxxxr0 Tone Grouping Factors and NDP Format for ax Date: Authors: Name Company Address Phone Sameer Vermani Qualcomm 5775 Morehouse Dr San Diego, CA  Alice Chen Lin Yang Bin Tian Tao Tian Arjun Bharadwaj Hemanth Sampath Richard Van Nee Straatweg 66-S Breukelen, 3621 BR Netherlands Allert Van Zelst Youhan Kim 1700 Technology Drive San Jose, CA 95110, USA VK Jones Sameer Vermani (Qualcomm) Hongyuan Zhang, Marvell; etc.

2 Authors (continued) Qinghua Li Intel
Name Affiliation Address Phone Qinghua Li Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA      Xiaogang Chen Robert Stacey Po-Kai Huang Chitto Ghosh Rongzhen Yang Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 Yakun Sun Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sameer Vermani (Qualcomm)

3 5488 Marvell Lane, Santa Clara, CA, 95054
Month Year doc.: IEEE yy/xxxxr0 Authors (continued) Name Affiliation Address Phone Sudhir Srinivasa Marvell (Cont’d) 5488 Marvell Lane, Santa Clara, CA, 95054 Saga Tamhane Mao Yu Edward Au Hui-Ling Lou Ron Porat Broadcom Matthew Fischer Sriram Venkateswaran Tu Nguyen Vinko Erceg Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 Pooya Monajemi Sameer Vermani (Qualcomm) Hongyuan Zhang, Marvell; etc.

4 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130, Korea
Authors (continued) Name Affiliation Address Phone Kiseon Ryu LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Jinyoung Chun Jinsoo Choi Jeongki Kim Giwon Park Dongguk Lim Suhwook Kim Eunsung Park HanGyu Cho Thomas Derham Orange Sameer Vermani (Qualcomm)

5 Authors (continued) Fei Tong Samsung Hyunjeong Kang Kaushik Josiam
Name Affiliation Address Phone Fei Tong Samsung Innovation Park, Cambridge CB4 0DS (U.K.) Hyunjeong Kang Maetan 3-dong; Yongtong-Gu Suwon; South Korea Kaushik Josiam 1301, E. Lookout Dr, Richardson TX 75070 (972) Mark Rison Rakesh Taori (972) Sanghyun Chang Yasushi Takatori NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa Japan Yasuhiko Inoue Yusuke Asai Koichi Ishihara Akira Kishida Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka-shi, Kanagawa, , Japan Fujio Watanabe 3240 Hillview Ave, Palo Alto, CA 94304 Haralabos Papadopoulos Sameer Vermani (Qualcomm)

6 Authors (continued) Phillip Barber Huawei Peter Loc Le Liu Jun Luo
Name Affiliation Address Phone Phillip Barber Huawei The Lone Star State, TX Peter Loc Le Liu F1-17, Huawei Base, Bantian, Shenzhen Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Yi Luo Yingpei Lin Jiyong Pang Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA  NA Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada David X. Yang Yunsong Yang Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen Junghoon Suh Jiayin Zhang Sameer Vermani (Qualcomm)

7 Authors (continued) James Yee Mediatek
Name Affiliation Address Phone James Yee Mediatek No. 1 Dusing 1st Road, Hsinchu, Taiwan   Alan Jauh Chingwa Hu Frank Hsu Thomas Pare USA 2860 Junction Ave, San Jose, CA 95134, USA ChaoChun Wang James Wang Jianhan Liu Tianyu Wu Russell Huang Eric Wong Apple Cupertino, CA Chris Hartman Aon Mujtaba Joonsuk Kim Guoqing Li   Sameer Vermani (Qualcomm)

8 Authors (continued) Weimin Xing ZTE Corp. Xing.weimin@zte.com.cn
Name Affiliation Address Phone Weimin Xing ZTE Corp. Kaiying Lv Ke Yao Bo Sun Yonggang Fang ZTE TX Kazuyuki Sakoda           Sony Electronics Yusuke Tanaka Eisuke Sakai Yuichi Morioka Masahito Mori Sameer Vermani (Qualcomm)

9 Introduction In these slides, we cover the following two topics
July 2008 Introduction In these slides, we cover the following two topics Tone grouping factors for CSI feedback Show simulations for MU-MIMO performance NDP Frame Format Propose the following Disallow Ng=1 feedback in ax Use the SU frame format for HE-NDP Terminology: In these slides, tone grouping factor is always defined with respect to data tones of the 11ax PPDU (regardless of the LTF duration used in NDP or data packet) E.g., Ng=4 in 11ax means 1 out of every 4 data tones of 11ax packet Sameer Vermani (Qualcomm)

10 Tone Grouping Factors In ac, the process of sub-sampling the CSI feedback is called tone-grouping Sending one value of V or one value of S for a “group” of tones E.g. Tone grouping factor, Ng =2 means that one V is sent for a group of 2 tones Once Ng has been chosen, Ng’ = 2* Ng is the tone-grouping factor used for S Ng=1 feedback in 11ax would be prohibitively expensive Would be approximately 4 times in size compared to Ng=1 feedback in 11ac Tones in 11ax are 4 times thinner Based on our results, even Ng=4 for 11ax works for indoor channels Will show simulation results in subsequent slides Suggest restricting Ng to be greater than equal to 2 for 11ax Ng=4 works well for most practical scenarios where MU-MIMO will be used Ng=2 might have some use for outdoor channels Sameer Vermani (Qualcomm)

11 Simulations for Tone-grouping Factors
Month Year doc.: IEEE yy/xxxxr0 Simulations for Tone-grouping Factors Compared the 20MHz DL MU-MIMO performance with various options Tone-grouping factor, Ng=1 and 4 LTF durations used in NDP 4x when Ng=1, and 1x when Ng=4 1x LTFs in NDP have two options VHT-LTF with 56 tones HE-1x-LTF: A modified VHT-LTF with more edge tones leading to total 60 tones Tried both 2x and 4x LTFs in DL MU-MIMO data packet Minimal performance difference for indoor channels Show that Ng=4 with 1x LTFs in NDP (and no edge tone augmentation) has good performance for indoor channels Similar performance as Ng=1 with 4x LTFs in NDP Assumed simple linear interpolation at the AP and phase alignment of V Simulated both channel models D-NLOS and E-NLOS Sameer Vermani (Qualcomm) Hongyuan Zhang, Marvell; etc.

12 Simulation Assumptions
Considered a 20MHz DL MU-MIMO system with 8 Tx AP, and 3 STAs with 2 Rx antennas each, 2 streams per STA MMSE precoding done at the AP Capacity averaged post processing SINRs mapped to PHY throughputs using AWGN rate table Plot the 10th percentile and 50th percentile PHY throughputs for 200 channel realizations of D-NLOS/E-NLOS as a function of path-loss Sum PHY throughput at the AP Aging Loss = -30 dBc Tx Distortion = -35 dBc Channel estimation loss is considered both in sounding and in actual data transmission No quantization is considered to isolate the impact of interpolations No smoothing at the STA is assumed Sameer Vermani (Qualcomm)

13 Simulation Results: D-NLOS
Ng=4 feedback with 1x LTFs in NDP shows some smoothing gain compared to Ng=1 with 4x LTFs in NDP In reality Ng=1 can also benefit from smoothing Nevertheless, these results give confidence in Ng=4 with 1x LTFs in NDP Sameer Vermani (Qualcomm)

14 Simulation Results: E-NLOS
Ng=4 feedback with 1x LTFs in NDP shows some smoothing gain compared to Ng=1 with 4x LTFs in NDP In reality Ng=1 can also benefit from smoothing Nevertheless, these results give confidence in Ng=4 with 1x LTFs in NDP Sameer Vermani (Qualcomm)

15 HE-NDP HE-NDP is needed to cover outdoor use-case
Month Year doc.: IEEE yy/xxxxr0 HE-NDP HE-NDP is needed to cover outdoor use-case May allow multiple HE-LTF durations in an HE-NDP A subset of 1x, 2x and 4x LTFs may be allowed Re-use the SU frame format for the HE-NDP HE-SIG-B is not needed May need some packet extension at the end Format of HE-NDP L-STF L-LTF L-SIG RL-SIG HE-SIG-A HE-STF HE-LTFs Packet Extension Sameer Vermani (Qualcomm) Hongyuan Zhang, Marvell; etc.

16 Summary Ng=1 feedback is very expensive for 11ax
Has 4 times overhead when compared to the Ng=1 feedback of 11ac Showed simulations to show that Ng=4 in 11ax gives satisfactory performance in indoor channels for MU-MIMO Suggest disallowing Ng=1 sounding feedback in ax Also recommend to use the SU frame format for HE-NDP Sameer Vermani (Qualcomm)

17 Straw-poll 1 Do you agree to add the following text to the TGax spec framework document: “802.11ax spec shall not support Ng=1 for sounding feedback. Note that the tone grouping factor, Ng is defined with respect to data tones of the 11ax PPDU. ” Y N A Sameer Vermani (Qualcomm)

18 Straw-poll 2 Do you support to add the following text and diagram to the SFD The spec shall define an HE-NDP for collecting sounding feedback, whose frame format is shown in the diagram below. The presence and duration of packet extension at the end of HE-NDP is TBD. Format of HE-NDP L-STF L-LTF L-SIG RL-SIG HE-SIG-A HE-STF HE-LTFs Packet Extension Sameer Vermani (Qualcomm)

19 Motion 1 Move to add the following text to the TGax spec framework document: “802.11ax spec shall not support Ng=1 for sounding feedback. Note that the tone grouping factor, Ng is defined with respect to data tones of the 11ax PPDU. ” Sameer Vermani (Qualcomm)

20 Motion 2 Move to add the following text and diagram to the SFD
The spec shall define an HE-NDP for collecting sounding feedback, whose frame format is shown in the diagram below. The presence and duration of packet extension at the end of HE-NDP is TBD. Format of HE-NDP L-STF L-LTF L-SIG RL-SIG HE-SIG-A HE-STF HE-LTFs Packet Extension Sameer Vermani (Qualcomm)

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