1. Extended BA Date: 2016-03-14 Month Year Doc Title Simone Merlin
Name
Affiliation
Address
Phone
Simone Merlin
Qualcomm
5775 Morehouse Dr. San Diego, CA, USA
Albert Van Zelst
Straatweg 66-S Breukelen, 3621 BR Netherlands
Alfred Asterjadhi
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
Simone Merlin (Qualcomm)
John Doe, Some Company

2. Authors (continued) Rolf De Vegt Sameer Vermani Qualcomm Alice Chen
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
Alice Chen
Tevfik Yucek  
VK Jones
Youhan Kim
Simone Merlin (Qualcomm)

3. 2111 NE 25th Ave, Hillsboro OR 97124, USA
Name
Affiliation
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Zhou Lan
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Mingyue Ji
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
Simone Merlin (Qualcomm)

4. Authors (continued) Hongyuan Zhang Marvell
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
Simone Merlin (Qualcomm)

5. 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  
Alan Jauh
Frank Hsu
Joonsuk Kim
Apple
Aon Mujtaba  
Guoqing Li
Eric Wong
Chris Hartman
Simone Merlin (Qualcomm)

6. Authors (continued) David X. Yang Jiayin Zhang Jun Luo Yi Luo Huawei
Name
Affiliation
Address
Phone
David X. Yang
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
Ming Gan
Yunsong Yang
Junghoon Suh
303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Peter Loc
Edward Au
Teyan Chen
Yunbo Li
Simone Merlin (Qualcomm)

7. 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 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
Simone Merlin (Qualcomm)

8. 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
Simone Merlin (Qualcomm)

9. Authors (continued) Simone Merlin (Qualcomm) Name Affiliation Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Tomoko Adachi
Toshiba
Narendar Madhavan
Kentaro Taniguchi
Toshihisa Nabetani
Tsuguhide Aoki
Koji Horisaki
David Halls
Filippo Tosato
Zubeir Bocus
Fengming Cao
Parag Kulkarni
Simone Merlin (Qualcomm)

10. Authors (continued) Simone Merlin (Qualcomm) Minho Cheong
Newracom, Inc.
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
Simone Merlin (Qualcomm)

11. Introduction
Existing BA frame format and protocol allows for acknowledging at most 64 MPDUs at a time
BA Bitmap in the BA Frame format include 64-bits
MAC efficiency may be limited:
At high rates, Data PPDUs are short and overhead increases
E.g.: no A-MSDU aggregation:
A-MPDU only carries 64x1500 = 96KB = 96us 1Gbps + an overhead of ~40us preamble + BA
If A-MSDU is used
Heavy use of A-MSDU causes less reliable MPDUs, increased PER [1]
Moreover, also in this case, at peak 11ax rate the efficiency is reduced: A-MPDU + A-MSDU can at most pack ~750KB = <100us at peak 11ax rate.
BA windows advancement is limited in case of burst of errors
We propose to add an option for a longer BA bitmap
Simone Merlin (Qualcomm)

12. BA > 64
Proposal: Define a BA frame format that allows to acknowledge > 64 MPDUs for same TID for a STA
We suggest to allow the possibility to acknowledge of up to 256 MPDUs
Good balance between increased efficiency and implementation/memory requirements
Support for the new bitmaps size is to be negotiated in ADDBA
Simone Merlin (Qualcomm)

13. Frame Format
We suggest to define a modified format of the Compressed BA which caries a 256-bits bitmap
BA > 64 is mostly useful in SU PPDUs, for which a regular Basic BA frame can be used
A reserved bit in the Fragment Number field can be used to indicate the length
The proposal in [2] suggests to use the same indication in case of M-BA, for unified design
Simone Merlin (Qualcomm)

14. Usage
Buffer size and support for the new bitmap size will be negotiated.
Once negotiated, which BA length is actually used as a response?
The simplest option is that once negotiated, a responsding STA will always use the negotiated length.
A more dynamic way is for the responding STA to use a BA bitmap of minimum size that covers all the outstanding SNs for which a correct MPDU was received
Response duration is unpredictable from transmitter, which hiders the efficiency gain: te transmitter will have to set the NAV to the longest expected response
Simone Merlin (Qualcomm)

15. References [1] 11-13/449 lb197-cid278-extended-block-ack
Month Year
References
[1] 11-13/449 lb197-cid278-extended-block-ack
[2] 11-16/0404r0 Block Ack Bitmap

16. SP1
Do you support to add to the SFD the definition of a variant of the Compressed BA frame format with a 256-bits BA Bitmap field?

17. SP2 Do you support to add to the 11ax SFD
Reserved bit(s) in Fragment Number field of the BA are used to indicate the length of the BA Bitmap within the same BA Information field?