1. HE Sounding Segmentation
Date:
Name
Affiliation
Address
Phone
Hongyuan Zhang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054
Yakun Sun
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
Liwen Chu (Marvell) et. al.,

2. Authors (continued) Alfred Asterjadhi Albert Van Zelst Alice Chen
Name
Affiliation
Address
Phone
Alfred Asterjadhi
Qualcomm
5775 Morehouse Dr. San Diego, CA, USA
Albert Van Zelst
Straatweg 66-S Breukelen, 3621 BR Netherlands
Alice Chen
Arjun Bharadwaj
Bin Tian
Carlos Aldana
1700 Technology Drive San Jose, CA 95110, USA
George Cherian
Gwendolyn Barriac
Hemanth Sampath
Lin Yang
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
Liwen Chu et. al.

3. Authors (continued) Rolf De Vegt Qualcomm Sameer Vermani 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
Tao Tian
Tevfik Yucek  
VK Jones
Youhan Kim
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
Liwen Chu et. al.

4. No. 1 Dusing 1st Road, Hsinchu, Taiwan +886-3-567-0766
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
Zhou Lan
Russell Huang
Joonsuk Kim
Apple
Aon Mujtaba  
Guoqing Li
Eric Wong
Chris Hartman
Liwen Chu et. al.

5. Authors (continued) Peter Loc Le Liu Jun Luo Yi Luo Huawei Yingpei Lin
Name
Affiliation
Address
Phone
Peter Loc
Huawei
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
Junghoon Suh
Jiayin Zhang
Edward Au
Teyan Chen
Yunbo Li
Liwen Chu et. al.

6. Authors (continued) Jinmin Kim Kiseon Ryu Jinyoung Chun
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 Park
HanGyu Cho
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
Liwen Chu et. al.

7. Authors (continued) Fei Tong Hyunjeong Kang Samsung 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
Fujio Watanabe
3240 Hillview Ave, Palo Alto, CA 94304
Haralabos Papadopoulos
Liwen Chu et. al.

8. Authors (continued) Name Affiliation Ron Porat Broadcom
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Thomas Derham
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Liwen Chu et. al.

9. Beamforming Feedback Fragmentation Avoidance
Recap: To avoid sounding feedback fragmentation, the following rule is defined in 11ax
The HE beamformer shall have the supported MPDU size large enough to avoid fragmentation except when 11,454 is reached.
However it is not clear whether there is specific rules about resource allocation to beamformee in Beamforming Report Poll Trigger frame.
The HE sounding fragmentation method is not clearly defined in 11ax D0.1.
Liwen Chu, Marvell, et. al.

10. Beamforming Feedback Fragmentation Avoidance
The following rules should be applied to 11ax sounding feedback fragmentation which is similar to 11ac:
“the sounding feedback shall be split into up to 8 feedback segments.”
“Each of the feedback segments except the last shall contain the maximum number of octets allowed by the HE beamformer’s maximum MPDU length capability.”
“The feedback segments shall be sent in a single A-MPDU and shall be included in the A-MPDU in the descending order of the Remaining Feedback Segments subfield values.”
All segments in the first transmission
The requested segments in the retransmission
All segments in the retransmission should be disallowed in not request by the beamformer.
The difference between HE trigger-based sounding feedback and VHT sounding feedback is that:
In VHT sounding feedback, it is the beamformee to decide the resource for sounding feedback. 11ac mandates that
In HE trigger-based sounding feedback, Trigger frame defines the resource of HE sounding feedback. If the resource allocated for STA’s feedback is not enough, the beamformee may not be able to send sounding feedback in one A-MPDU.
When the sounding feedback is retransmitted, the AP only allocates the enough resource for the retransmitted segments.
If the beamformee retransmit all segments, the allocated resource may not be enough.
Liwen Chu, Marvell, et. al.

11. Beamforming Feedback Fragmentation Avoidance
AP’s resource allocation in Beamforming Report Poll Trigger should be defined:
in Beamforming Report Poll Trigger,  the allocated UL resource for one beamformee’s  sounding feedback shall be enough for the beamformee to transmit the requested sounding feedback in one PPDU per its Feedback type, Ng, codebook size, Nc, and Partial Bandwidth Info.
STA’s (beamformee’s) behavior should be defined:
When the AP requests retransmission of sounding feedback segments from a beamformee through Beamforming Report Poll Trigger, the beamformee shall transmit the requested segments first.
Liwen Chu, Marvell, et. al.

12. Straw Poll 1 Do you support,
in Beamforming Report Poll Trigger,  the allocated UL resource for one beamformee’s   sounding feedback shall be enough for the beamformee to transmit the requested sounding feedback  in the trigger-based PPDU that is sent as a response per its Feedback type, Ng, codebook size, Nc.
Liwen Chu, Marvell, et. al.

13. Straw Poll 2
Do you the following rules apply to 11ax sounding feedback fragmentation,
the sounding feedback shall be split into up to 8 feedback segments
Each of the feedback segments except the last shall contain the maximum number of octets allowed by the HE beamformer’s maximum MPDU length capability
the request feedback segments shall be sent in a single A-MPDU and shall be included in the A-MPDU in the descending order of the Remaining Feedback Segments subfield values.
Liwen Chu, Marvell, et. al.