1. NAV resetting with RTS or MU-RTS
July 2008
doc.: IEEE /1021r0
NAV resetting with RTS or MU-RTS
Date:
Name
Affiliation
Address
Phone
Weimin Xing
ZTE
#9 Wuxingduan, Xifeng Rd., Xi'an, China
Kaiying Lv
Yonggang Fang
Bo Sun
Ke Yao
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
Weimin Xing et al. (ZTE)
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

3. Authors (continued) Name Affiliation Address Phone Email 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

4. Authors (continued) Alice Chen Qualcomm 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
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

5. 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
Tevfik Yucek  
VK Jones
Youhan Kim

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

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
Weimin Xing et al. (ZTE)

8. 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130, Korea
Authors (continued)
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
Brian Hart
Cisco Systems
170 W Tasman Dr, San Jose, CA 95134
Pooya Monajemi
Weimin Xing et al. (ZTE)

9. 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
Weimin Xing et al. (ZTE)

10. Authors (continued) Weimin Xing et al. (ZTE) 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
Weimin Xing et al. (ZTE)

11. Authors (continued) Weimin Xing et al. (ZTE) 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
Weimin Xing et al. (ZTE)

12. Motivation
In the baseline spec, A STA can reset its NAV timer to 0 on following conditions：
TXOP setup failure case：
When a STA receives an RTS frame and updates its NAV based on the Duration field in the RTS frame，the STA is permitted to reset its NAV timer to 0 if no PHY-RXSTART.indication primitive is received from the PHY during a period with a duration of (2*aSIFSTime) + (CTS_Time) +aRxPHYStartDelay +(2*aSlotTime).
TXOP truncation case：
A STA shall interpret the reception of a CF-End frame as a NAV reset, i.e., it resets its NAV timer to 0 at the end of the PPDU containing this frame.
Two NAV is introduced in 11ax, the NAV resetting rules for two NAVs should be defined.
NAV reset rules with RTS/MU-RTS when two NAVs been used.
11ax Spec defined a new type of RTS, MU-RTS, MU-RTS is a new MAC frame, and it can be sent in legacy format to protect the TXOP.
Both legacy and HE STAs can update their NAVs based on the Duration field of the received new type of RTS frame in non-HT format
Can HE STA reset the NAV update by a MU-RTS when TXOP setup fails?
This contribution provides our views on above issue .
Weimin Xing et al. (ZTE)

13. NAV resetting with RTS for two NAVs
When two NAV is used, a intra-BSS RTS will only update STA’s intra-BSS NAV, and a inter-BSS RTS will update its regular NAV
So it’s better to reset the according NAV when TXOP setup is fail.
An HE STA that used information from an RTS frame from an intra-BSS STA as the most recent basis to update its intra-BSS NAV setting is only permitted to reset its intra-BSS NAV timer if no PHY-RXSTART.indication primitive is received from the PHY during a period with a duration of (2*aSIFSTime) + (CTS_Time) +aRxPHYStartDelay +(2*aSlotTime).
An HE STA that used information from an RTS frame from an inter-BSS STA as the most recent basis to update its regular NAV setting is only permitted to reset its regular NAV timer if no PHY-RXSTART.indication primitive is received from the PHY during a period with a duration of (2*aSIFSTime) + (CTS_Time) +aRxPHYStartDelay +(2*aSlotTime).
Weimin Xing et al. (ZTE)

14. NAV resetting with MU-RTS
If the transmission of MU-RTS is fail, the STA updating its NAV with the MU-RTS should also be allowed to reset its NAV.
STAs whose NAV was updated by MU-RTS can quickly recover if the TXOP setup fails.
Both 11ax and legacy STAs can update their NAVs based on the Duration field of MU-RTS in non-HT format.
For legacy STAs, the NAV updated by MU-RTS can not be reset.
For legacy STA, NAV resetting is only allowed for RTS frame
HE STA can apply NAV resetting rules for MU-RTS
Weimin Xing et al. (ZTE)

15. Summary
The issues of NAV resetting rule with two NAVs when a TXOP setup failure is discussed.
RTS/CTS NAV resetting rules when two NAV are used.
NAV resetting rules with MU-RTS.
We propose to define
A HE STA that used information from an RTS/MU-RTS frame as the most recent basis to update its NAV setting is permitted to reset its NAV timer which is updated by the MU-RTS/RTS frame, if no PHY-RXSTART.indication primitive is received from the PHY during a period with a duration of (2*aSIFSTime) + (CTS_Time) +aRxPHYStartDelay +(2*aSlotTime).
The proposed spec texts is provided in document 16/0925r0.
Weimin Xing et al. (ZTE)

16. Straw Poll 1
Do you agree to accept the proposed text in document 16/0925r0?
Weimin Xing et al. (ZTE)

17. Reference
Weimin Xing et al. (ZTE)