1. Packet extension factor calculation fix
Month Year
doc.: IEEE /1133r0
2/24/2019
Packet extension factor calculation fix
Date:
Authors:
Name
Affiliation
Address
Phone
Hongyuan Zhang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054
Yan Zhang
Lei Wang
Liwen Chu
Jinjing Jiang
Rui Cao
Sudhir Srinivasa
Bo Yu
Saga Tamhane
Mao Yu
Xiayu Zheng
Christian Berger
Niranjan Grandhe
Hui-Ling Lou
Yan Zhang, et. al. (Marvell)
Hongyuan Zhang, Marvell; etc.

2. Authors (continued) 2/24/2019 Month Year doc.: IEEE 802.11-16/1133r0
Name
Affiliation
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Zhou Lan
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Yan Zhang, et. al. (Marvell)
Hongyuan Zhang, Marvell; etc.

3. Authors (continued) 2/24/2019 Alice Chen Albert Van Zelst
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
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
Yan Zhang, et. al. (Marvell)

4. Authors (continued) 2/24/2019 Rolf De Vegt Sameer Vermani Qualcomm
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
Yan Zhang, et. al. (Marvell)

5. 2/24/2019
Authors (continued)
Yan Zhang, et. al. (Marvell)

6. Authors (continued) 2/24/2019 Month Year doc.: IEEE 802.11-16/1133r0
Yan Zhang, et. al. (Marvell)
Hongyuan Zhang, Marvell; etc.

7. #9 Wuxingduan, Xifeng Rd., Xi'an, China
Month Year
doc.: IEEE /1133r0
2/24/2019
Authors (continued)
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
Yan Zhang, et. al. (Marvell)
Hongyuan Zhang, Marvell; etc.

8. Authors (continued) 2/24/2019 Month Year doc.: IEEE 802.11-16/1133r0
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
Yan Zhang, et. al. (Marvell)

9. Authors (continued) 2/24/2019 Minho Cheong Reza Hedayat
Name
Affiliation
Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Sigurd Schelstraete
Quantenna
Huizhao Wang
Minho Cheong
Newracom
9008 Research Dr.
Irvine, CA 92618
Reza Hedayat
Young Hoon Kwon
Yongho Seok
Daewon Lee
Yujin Noh
Yan Zhang, et. al. (Marvell)

10. 2/24/2019 Month Year doc.: IEEE 802.11-16/1133r0
Yan Zhang, et. al. (Marvell)

11. 2/24/2019
Discussion
For 80MHz bandwidth, NSD_short value used in packet extension is less than NSD/4. Therefore a_factor can be greater than 4 if it is calculated by Equation (26-64) in Draft 0.4 clause
For example, 80MHz bandwidth SU transmission at MCS11 with 1 spatial stream, and data packet size of 8000 bits, STBC disabled.
In this case, total data size is 8016bits, and NDBPS = floor(980*10*5/6) = 8166 bits. Excess bits = NSD_short = 240 tones. NDBPS,short = 240*10*5/6=2000.
If we use equation (2-64), a_factor = ceil(Excess bits, NDBPS,short )= 5, which is wrong.
Yan Zhang, et. al. (Marvell)

12. 2/24/2019
Solution
Change spec text in clause in Draft 4.0 (P198L55) to “Then based on NExcess, compute the initial number of symbol segments in the last OFDM symbol(s), a-factor value or ainit, as shown in Equation (26-64)
This change guarantees that ainit range is within [1,4].
Yan Zhang, et. al. (Marvell)

13. 2/24/2019
SP1
Do you agree to adopt the spec text changes as shown in doc 11/ r0?
Yan Zhang, et. al. (Marvell)