1. Load balancing indication for MU-MIMO over 484-tone and larger RU in OFDMA
Date:
Authors:
Name
Affiliation
Address
Phone
Ming Gan
Huawei
F1-17, Huawei Base, Bantian, Shenzhen
Jiayin Zhang
5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai
Jun Luo
Yi Luo
Yingpei Lin
Jiyong Pang
Zhigang Rong
10180 Telesis Court, Suite 365, San Diego, CA  NA
Jian Yu
David X. Yang
Yunsong Yang
Ming Gan et al. (Huawei)

2. Authors (continued) 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Name
Affiliation
Address
Phone
Dengyu Qiao
Huawei
Junghoon Suh
303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Peter Loc
Edward Au
Teyan Chen
F1-17, Huawei Base, Bantian, Shenzhen
Yunbo Li
Jason Yuchen Guo
Name
Affiliation
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Zhou Lan
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Mingyue Ji
Ming Gan et al. (Huawei)

3. Authors (continued) Alice Chen Albert Van Zelst Alfred Asterjadhi
Name
Affiliation
Address
Phone
Alice Chen
Qualcomm
5775 Morehouse Dr. San Diego, CA, USA
Albert Van Zelst
Straatweg 66-S Breukelen, 3621 BR Netherlands
Alfred Asterjadhi
Bin Tian
Carlos Aldana
1700 Technology Drive San Jose, CA 95110, USA
George Cherian
Gwendolyn Barriac
Hemanth Sampath
Lin Yang
Lochan Verma
5775 Morehouse Dr. San Diego, CA USA
Menzo Wentink
Naveen Kakani
2100 Lakeside Boulevard Suite 475, Richardson TX 75082, USA
Raja Banerjea
1060 Rincon Circle San Jose CA 95131, USA
Richard Van Nee
Ming Gan et al. (Huawei)

4. Authors (continued) Rolf De Vegt Sameer Vermani Qualcomm Simone Merlin
Name
Affiliation
Address
Phone
Rolf De Vegt
Qualcomm
1700 Technology Drive San Jose, CA 95110, USA
Sameer Vermani
5775 Morehouse Dr. San Diego, CA, USA
Simone Merlin
Tevfik Yucek  
VK Jones
Youhan Kim
Ming Gan et al. (Huawei)

5. 2111 NE 25th Ave, Hillsboro OR 97124, USA
Authors (continued)
Name
Affiliation
Address
Phone
Robert Stacey
Intel
2111 NE 25th Ave, Hillsboro OR 97124, USA     
Shahrnaz Azizi
Po-Kai Huang
Qinghua Li
Xiaogang Chen
Chitto Ghosh
Laurent Cariou
Yaron Alpert
Assaf Gurevitz
Ilan Sutskover
Feng Jiang
Ming Gan et al. (Huawei)

6. 5488 Marvell Lane, Santa Clara, CA, 95054
Authors (continued)
Name
Affiliation
Address
Phone
Hongyuan Zhang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054
Lei Wang
Liwen Chu
Jinjing Jiang
Yan Zhang
Rui Cao
Sudhir Srinivasa
Bo Yu
Saga Tamhane
Mao Yu
Xiayu Zheng
Christian Berger
Niranjan Grandhe
Hui-Ling Lou
Ming Gan et al. (Huawei)

7. Authors (continued) Jianhan Liu Mediatek USA
Name
Affiliation
Address
Phone
Jianhan Liu
Mediatek
USA
2860 Junction Ave, San Jose, CA 95134, USA
Thomas Pare
ChaoChun Wang
James Wang
Tianyu Wu
Russell Huang
James Yee
No. 1 Dusing 1st Road, Hsinchu, Taiwan  
Frank Hsu
Joonsuk Kim
Apple
Aon Mujtaba  
Guoqing Li
Eric Wong
Chris Hartman
Jarkko Kneckt
Ming Gan et al. (Huawei)

8. Authors (continued) Jinmin Kim LG Electronics
Name
Affiliation
Address
Phone
Jinmin Kim
LG Electronics
19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea
Kiseon Ryu
Jinyoung Chun
Jinsoo Choi
Jeongki Kim
Dongguk Lim
Suhwook Kim
Eunsung Park
Jayh hyunhee Park
HanGyu Cho
Thomas Derham
Orange
Bo Sun
ZTE
#9 Wuxingduan, Xifeng Rd., Xi'an, China
Kaiying Lv
Yonggang Fang
Ke Yao
Weimin Xing
Brian Hart
Cisco Systems
170 W Tasman Dr, San Jose, CA 95134
Pooya Monajemi
Ming Gan et al. (Huawei)

9. 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  
Shoko Shinohara
Yusuke Asai  
Koichi Ishihara  
Junichi Iwatani  
Akira Yamada
NTT DOCOMO
3-6, Hikarinooka, Yokosuka-shi, Kanagawa, , Japan
 3759
Ming Gan et al. (Huawei)

10. Authors (continued) Minho Cheong Reza Hedayat 9008 Research Dr.
Name
Affiliation
Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Minho Cheong
Newracom
9008 Research Dr.
Irvine, CA 92618
Reza Hedayat
Young Hoon Kwon
Yongho Seok
Daewon Lee
Yujin Noh
Sigurd Schelstraete
Quantenna
3450 W. Warren Ave, Fremont, CA 94538
Huizhao Wang
Ming Gan et al. (Huawei)

11. Authors (continued) Ming Gan et al. (Huawei) Name Affiliation Address
Phone
Narendar Madhavan
Toshiba
Masahiro Sekiya
Toshihisa Nabetani
Tsuguhide Aoki
Tomoko Adachi
Kentaro Taniguchi
Daisuke Taki
Koji Horisaki
David Halls
Filippo Tosato
Zubeir Bocus
Ming Gan et al. (Huawei)

12. Overview The agreement in 802.11ax Spec Some leftover issues:
The RU allocation signalling in the Common [Block] field of HE-SIG-B signals an 8 bit per 20 MHz PPDU BW for signalling
The RU arrangement in frequency domain
Number of MU-MIMO allocations: The RUs allocated for MU-MIMO and the number of users in the MU-MIMO allocations
For MU-MIMO allocation of RU size > 20 MHz, the user-specific [User Block] subfields are dynamically split between the two HE-SIG-B content channels (1/2) and the split is decided by the AP (on a per case basis).
Some leftover issues:
Load balancing indication for MU-MIMO over 484-tone and larger RU in OFDMA
Ming Gan et al. (Huawei)

13. Load balancing for MU-MIMO over 484/996-tone RU
For MU-MIMO+OFDMA, the MU-MIMO STAs’ information on 484/996-tone RU is distributed on CH1 and CH2
the user block subfields of MU-MIMO are split over 2 HE-SIG-B channels for 484/996-tone RU .
If all user block subfields are signaled in one HE-SIG-B channel, there is no user to signal in the other HE-SIG-B channel. Hence, The entry of ‘Zero STA’ is needed as a special case of load balancing for MU-MIMO on 484/996-tone RU
HE-SIG-B common
HE-SIG-B dedicated
STF/LTF/Data
CH1 1
8-bit for CH1 (5 STAs) 8-bit for CH3 (2 STAs)
#1, 2, 3,4,5,6,7
MU-MIMO of STA#1, 2, 3, 4, 5
(5)
(0)
OFDMA on 80MHz
CH2 2
8-bit for CH2 (0 STA) 8-bit for CH4 (7 STAs)
#8,9,10,11,12,13,14
CH3 1
8-bit for CH1 (5 STAs) 8-bit for CH3 (2 STAs)
#1, 2, 3,4,5,6,7
STA#6,7
(2)
CH4 2
8-bit for CH2 (0 STA) 8-bit for CH4 (7 STAs)
#8,9,10,11,12,13,14
STA#8,9,10,11,12,13,14
(7)
Ming Gan et al. (Huawei)

14. Zero STA for 484/996-tone RU in 8-bit Table
How to indicate ‘Zero STA’ for 484/996-tone RU in 8-bit table?
Opt1: use only one entry to indicate ‘Zero STA’ state without indicating RU size
Opt2: use two entries to indicate ‘Zero STA’ state for 484-tone RU and 996-tone RU respectively  We slightly prefer Opt2 to indicate the Zero STA on specific RU size
CH1
CH2
CH3
CH4
CH5+6
CH7+8
STA#1~#9 (9STAs) over 242-tone RU
STA#10~#11 (2STAs)
over 242-tone RU
STA#12~#14 (2STAs)
over 242-tone RU
STA#15~#17 (3STAs)
over 242-tone RU
STA#18~#20 (3 MU-MIMO STAs)
over 484-tone RU
STA#21~#24 (4 MU-MIMO STAs)
over 484-tone RU f
80MHz
80MHz f
The STAs, who only successfully detect HE-SIG-B on CH1, can still know the RU allocation of 2 x 484-tone RU instead of 996-tone RU on CH5,6,7,8.
(Note：484-tone RU and 996-tone RU have different pilot number and positions.)
8-bit for CH1 (9 STAs)
8-bit for CH3 (3 STAs)
8-bit for CH5 (0 STAs)
8-bit for CH7 (0 STAs)
Per-STA info of STA#1~#9 in CH1,
Per-STA info of STA#12~#14 in CH3
CH1
8-bit for CH2 (2 STAs)
8-bit for CH4 (3 STAs)
8-bit for CH6 (3 STAs)
8-bit for CH8 (4 STAs)
Per-STA info of STA#10~#11 in CH2,
Per-STA info of STA#15~#17 in CH4,
Per-STA info of STA#18~#20 in CH5+6,
Per-STA info of STA#21~#24 in CH7+8.
CH2 t
HE-SIG-B common
HE-SIG-B dedicated
Ming Gan et al. (Huawei)

15. Conclusion
We propose to use two entries to indicate ‘Zero STA for 484/996-tone RU’ in 8-bit table for load balancing of MU-MIMO over 484 and larger RU in OFDMA.
Ming Gan et al. (Huawei)

16. References [1] 11-15-0132-16-00ax-spec-framework.docx
[2] ax-he-sig-b-contents
Ming Gan et al. (Huawei)

17. Straw Poll
Do you agree to add the following entries in 8-bit table to the IEEE ax SFD
two entries to indicate ‘Zero STA for 484-tone RU’ and ‘Zero STA for 996-tone RU’ respectively
Ming Gan et al. (Huawei)