1. Signaling Trigger Information for STAs in 802.11ax
November 2015
Date:
Authors:
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
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Chittabrata Ghosh, et al. (Intel)

2. Authors (continued) November 2015 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
Chittabrata Ghosh, et al. (Intel)

3. Authors (continued) November 2015 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
Chittabrata Ghosh, et al. (Intel)

4. Authors (continued) November 2015 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
Chittabrata Ghosh, et al. (Intel)

5. Authors (continued) November 2015 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
Zhou Lan
Russell Huang
Joonsuk Kim
Apple
Aon Mujtaba  
Guoqing Li
Eric Wong
Chris Hartman
Chittabrata Ghosh, et al. (Intel)

6. Authors (continued) November 2015 Peter Loc Le Liu Jun Luo Yi Luo
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
Chittabrata Ghosh, et al. (Intel)

7. Authors (continued) November 2015 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
Chittabrata Ghosh, et al. (Intel)

8. Authors (continued) November 2015 Fei Tong Hyunjeong Kang Samsung
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
Chittabrata Ghosh, et al. (Intel)

9. Authors (continued) November 2015 Chittabrata Ghosh, et al. (Intel)
Name
Affiliation
Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Chittabrata Ghosh, et al. (Intel)

10. November 2015
Abstract
In this contribution, we present a signaling rule for resource allocation when an A-MPDU contains both a Trigger frame and DL MPDUs
Chittabrata Ghosh, et al. (Intel)

11. Background - OFDMA ACK and Data Resources Allocation
November 2015
Background - OFDMA ACK and Data Resources Allocation
11AX SFD [1] defines a method for UL resource allocation
Trigger frame that allocates resources for the UL OFDMA/MU-MIMO transmission
11AX SFD [1] also has signaling mechanism of resource allocation in MAC header
The spec shall allow that the schedule information for OFDMA acknowledgement from STAs is contained in the MAC header of DL MPDU.
 The contents of the scheduling information for an UL OFDMA ACK/BA includes UL PPDU Length (9 bits) and RU Allocation (TBD).
Schedule information or trigger information for UL OFDMA ACK or Data in the Trigger frame and / or at the MAC header - Signaling duplication
Chittabrata Ghosh, et al. (Intel)

12. November 2015
OFDMA ACK + Data Trigger Information Scenario I :UL ACK + Data for same STAs
Trigger frame
DL MU frame STA #1
Trigger frame
: :
Trigger frame STA #n
UL MU frame STA #n
: :
UL MU frame STA #1
ACK/ BA STA #1
: :
ACK/ BA STA #n
Where should we indicate the trigger information for UL OFDMA ACK and Data?
Option 1 : only in the TF
Option 1I : only in the MAC header of DL MPDU
Option 1II : in TF and in MAC header as in SFD (duplication)
Chittabrata Ghosh, et al. (Intel)

13. November 2015
OFDMA ACK + Data Trigger Information Scenario II : UL ACK + Data for different STAs
Trigger frame
Trigger frame STA #p
: Trigger frame STA # k :
DL MU frame STA#n+1
DL MU frame STA #n
: :
DL MU frame STA #1
Where should we indicate the trigger information in case STAs need to transmit?
UL OFDMA ACK only
UL OFDMA ACK +data
UL OFDMA data only
Trigger frame
UL MU frame STA #n
: :
UL MU frame STA #1
ACK/ BA STA #n
ACK/ BA STA #1
ACK/ BA STA #n+1
: : : : :
ACK/ BA STA #k
UL MU frame STA #p
UL MU frame STA #k+1
Chittabrata Ghosh, et al. (Intel)

14. UL OFDMA ACK + Data Trigger Information Proposition
November 2015
UL OFDMA ACK + Data Trigger Information Proposition
We propose the following rule:
The trigger information of a STA is signaled either in Trigger frame(s) or in MPDU(s) of an A-MPDU, but not in both of them
Advantage:
Avoids duplications (e.g., AID) and complexity
Chittabrata Ghosh, et al. (Intel)

15. November 2015
Illustration of Trigger Information Signaling Scenario I :UL ACK + Data for same STAs
DL MU frame STA #1
MAC header STA# 1
: :
Trigger frame STA #n
UL MU frame STA #n
: :
UL MU frame STA #1
ACK/ BA STA #1
: :
Information for OFDMA ACK and for other frames contained in resource allocation element within the MAC header of DL MPDU
Chittabrata Ghosh, et al. (Intel)

16. November 2015
Illustration of Trigger Information Signaling Scenario II : UL ACK + Data for different STAs
Trigger frame STA #p
: Trigger frame STA # k :
DL MU frame STA#n+1
DL MU frame STA #n
: :
DL MU frame STA #1
MAC header STA# 1
Information for OFDMA ACK and other frames contained in resource allocation element within the MAC header of DL MPDU
MAC header STA# n
MAC header STA# n+1
UL MU frame STA #n
: :
UL MU frame STA #1
ACK/ BA STA #n
ACK/ BA STA #1
ACK/ BA STA #n+1
: : : : :
ACK/ BA STA #k
UL MU frame STA #p
UL MU frame STA #k+1
TF allocate resources for STAs that have allocations for UL Data
Chittabrata Ghosh, et al. (Intel)

17. November 2015
Conclusion
In order to avoid resource allocation duplication and complexity therein, we have proposed to signal trigger information either in Trigger frame(s) or in MAC header of MPDU(s)
Chittabrata Ghosh, et al. (Intel)

18. November 2015
References
[1] IEEE /0132r9 “Specification Framework for Tax”
Chittabrata Ghosh, et al. (Intel)

19. November 2015
Straw Poll 1
Within an A-MPDU the trigger information for a STA, if present, shall be signaled either in Trigger frame(s) or in the MAC header of MPDU(s) contained in the A-MPDU but not both.
Chittabrata Ghosh, et al. (Intel)