1. The co-existence of 11ax network and Ad Hoc/STA-2-STA Network
July 2008
doc.: IEEE /1021r0
The co-existence of 11ax network and Ad Hoc/STA-2-STA Network
Date:
Name
Affiliation
Address
Phone
Po-Kai Huang
Intel
2200 Mission College Blvd., Santa Clara, CA 95054, USA  
Robert Stacey
Qinghua Li
Shahrnaz Azizi
Xiaogang Chen
Chitto Ghosh
Laurent Cariou
Yaron Alpert
Assaf Gurevitz
Ilan Sutskover
Feng Jiang
Chao-Chun Wang et al. (MediaTek)
Peter Loc

2. 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
Chao-Chun Wang et al. (MediaTek)

3. Authors (continued) Chao-Chun Wang et al. (MediaTek) 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
Yuchen Guo
Yunsong Yang
Junghoon Suh
303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Peter Loc
Edward Au
Teyan Chen
Yunbo Li
Chao-Chun Wang et al. (MediaTek)

4. 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
Chao-Chun Wang et al. (MediaTek)

5. 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
Chao-Chun Wang et al. (MediaTek)

6. 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
Chao-Chun Wang et al. (MediaTek)

7. Authors (continued) Name Affiliation Ron Porat Broadcom
Address
Phone
Ron Porat
Broadcom
Sriram Venkateswaran
Matthew Fischer
Zhou Lan
Leo Montreuil
Andrew Blanksby
Vinko Erceg
Thomas Derham
Mingyue Ji
Chao-Chun Wang et al. (MediaTek)

8. 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
Chao-Chun Wang et al. (MediaTek)

9. Authors (continued) July 2013 doc.: IEEE 802.11-13/0787r0 Fei Tong
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
Chao-Chun Wang et al. (MediaTek)
Wu Tianyu

10. Authors (continued) Chao-Chun Wang et al. (MediaTek) Name Affiliation
Address
Phone
Masahito Mori
Sony Corp.
Yusuke Tanaka
Yuichi Morioka
Kazuyuki Sakoda
William Carney
Narendar Madhavan
Toshiba
Masahiro Sekiya
Toshihisa Nabetani
Tsuguhide Aoki
Tomoko Adachi
Kentaro Taniguchi
Daisuke Taki
Koji Horisaki
David Halls
Filippo Tosato
Zubeir Bocus
Fengming Cao
Chao-Chun Wang et al. (MediaTek)

11. Authors (continued) Chao-Chun Wang et al. (MediaTek) Name Affiliation
Address
Phone
Minho Cheong
Newracom, Inc.
9008 Research Dr, Irvine, CA 92618
Reza Hedayat
Young Hoon Kwon
Yongho Seok
Daewon Lee
Yujin Noh
Sigurd Schelstraete
Quantenna
Huizhao Wang
Chao-Chun Wang et al. (MediaTek)

12. Background
STA-2-STA operations in the proximity of 11ax BSS will likely increase contention and introduce inefficiency due to lack of coordination between STA-2-STA operations and 11ax OFDMA operations
The support for STA-2-STA operations such as P2P or TDLS
The co-existence issue of other STA-2-STA operations such as neighborhood aware network protocol developed in WFA should also be addressed.
Chao-Chun Wang et al. (MediaTek)

13. What are the issues
In the Wi-Fi system today, the CCA mechanism assures the co-existence of infrastructure and Ad Hoc operation
The trigger based operation and new power saving mechanism, such as TWT in 11ax introduced scheduled operation for MU transmission. The scheduling information is not recognized by STAs operate in Ad Hoc or STA-to-STA mode
Other than HE STA, STAs operating in the mode using protocols developed by other alliance or forum don’t recognize the trigger frame and the information carried in it.
There are protocols operate in Ad Hoc or STA-to-STA mode also have scheduled operation
HE AP does not understand the scheduling information of the Ad Hoc or STA-to-STA mode. The collision of schedule between Ad Hoc/STA-to-STA with trigger based schedule has huge impact to the performance of infrastructure and Ad Hoc operation.
Question: How to assure both 11ax and STA-to-STA operation could co-exist and keep the interference from each other to a minimum?
The proposal provides a tool allowing AP to manage the contention opportunity of STAs during a specific duration based on the channel loading in a dense environment
Chao-Chun Wang et al. (MediaTek)

14. A Proposal
Assuming a HE device also has an active interface for STA-to-STA operation and the triggering/scheduling information from both interfaces are shared in the system (a layer above the HE MAC)
The implementation of such function is not in the scope of the HE protocol
Procedure
A HE STA with the STA-to-STA scheduling information sends a request to its HE AP and asks the HE AP to schedule a quiet time period for the STA-to-STA operation
After receiving the request, the HE AP may send action frames to set up a quiet time period if it decides that setting the quiet time period is beneficial
After receiving the quiet time setup action frames, HE STAs in the HE BSS should stay silent during the quiet time period
Chao-Chun Wang et al. (MediaTek)

15. What the protocol needs?
A quiet time period request frame from an STA
The request frame is based on the quite time request frame with one extra field that carries an indication for the type of STA-to-STA operations (in vendor specific service id)
A quite time set up frame, an action frame ,transmitted by the HE AP to set up a quiet time period
A quiet time period setup frame has a Quiet Duration field and an indication for the type of STA-to-STA operations (in vendor specific service id)
An STA participates in STA-to-STA operation specified by the vendor specific service id still follows the CCA rule during the silent period for channel access
Chao-Chun Wang et al. (MediaTek)

16. Conclusion
The proposal expands the use of quiet element in the current specification from doing channel measure to interference mitigation between infrastructure and Ad Hoc mode of operation
The proposal provides a tool allowing AP to manage the contention opportunity of STAs during a specific duration based on the channel loading in a dense environment
A companion text describes the operation and complement of the operation is uploaded.
Chao-Chun Wang et al. (MediaTek)

17. Straw Poll 1
Do you agree to include the quiet element period duration proposal in the following doc in the 11ax specification?
Doc number will be updated later
Chao-Chun Wang et al. (MediaTek)

18. Reference
Chao-Chun Wang et al. (MediaTek)