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19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea

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Presentation on theme: "19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea"— Presentation transcript:

1 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130, Korea
Month Year doc.: IEEE yy/xxxxr0 September 2015 11ax Channel Access rule Date: Authors: Name Affiliation Address Phone Guoqing LI Apple 1 Infinite Loop Cupertino, CA 95014 USA Joonsuk Kim Eric Wong  Chris Hartman  Kiseon Ryu LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Jinyoung Chun Jinsoo Choi Jeongki Kim Giwon Park Dongguk Lim Suhwook Kim Eunsung Park HanGyu Cho Chinghwa Yu, MediaTek

2 Authors (continued) September 2015 Kazuyuki Sakoda Sony Corporation
Name Affiliation Address Phone Kazuyuki Sakoda           Sony Corporation 1-7-1 Konan  Minato-ku, Tokyo , Japan  Yusuke Tanaka Eisuke Sakai Yuichi Morioka Masahito Mori Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA      Po-Kai Huang Qinghua Li Xiaogang Chen Chitto Ghosh Rongzhen Yang Laurent cariou Chao-Chun Wang et al, MediaTek Inc.

3 5488 Marvell Lane, Santa Clara, CA, 95054
September 2015 Authors (continued) Name Affiliation Address Phone Yakun Sun Marvell 5488 Marvell Lane, Santa Clara, CA, 95054 Hongyuan Zhang Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sudhir Srinivasa Saga Tamhane Mao Yu Edward Au Hui-Ling Lou Ron Porat Broadcom Matthew Fischer Sriram Venkateswaran Leo Montreuil Andrew Blanksby Vinko Erceg Chao-Chun Wang et al, MediaTek Inc.

4 Authors (continued) September 2015 Peter Loc Huawei Le Liu Jun 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 Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen Junghoon Suh Jiayin Zhang Chao-Chun Wang et al, MediaTek Inc.

5 Authors (continued) September 2015 Albert Van Zelst Qualcomm
Name Affiliation Address Phone Albert Van Zelst Qualcomm Straatweg 66-S Breukelen, 3621 BR Netherlands Alfred Asterjadhi 5775 Morehouse Dr. San Diego, CA, USA Bin Tian Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA George Cherian Gwendolyn Barriac Hemanth Sampath Menzo Wentink Richard Van Nee Rolf De Vegt Sameer Vermani Simone Merlin Tevfik Yucek   VK Jones Youhan Kim Chao-Chun Wang et al, MediaTek Inc.

6 Authors (continued) September 2015 Thomas Derham Orange Brian Hart
Name Affiliation Address Phone Thomas Derham Orange Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 Pooya Monajemi Chao-Chun Wang et al, MediaTek Inc.

7 Authors (continued) September 2015 Fei Tong Samsung Hyunjeong Kang
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 Yusuke Asai Koichi Ishihara Akira Kishida Akira Yamada NTT DOCOMO 3-6, Hikarinooka, Yokosuka-shi, Kanagawa, , Japan Fujio Watanabe 3240 Hillview Ave, Palo Alto, CA 94304 Haralabos Papadopoulos Chao-Chun Wang et al, MediaTek Inc.

8 Authors (continued) September 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 Russell Huang Bo Sun ZTE #9 Wuxing duan, Xifeng Rd, Xi’an, China Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Chao-Chun Wang et al, MediaTek Inc.

9 Month Year doc.: IEEE yy/xxxxr0 September 2015 Summary All Wi-Fi systems follow the channel access rule defined in Each STA contends for the channel based on CCA threshold of the primary channel There are discussions in the 11ax to use different CCA levels for interBSS traffic and IntraBSS traffic in order to facilitate spatial reuse The intention is to possibility allow an STA to transmit frames when it detects interBSS traffic. It may do so by combining other techniques The proposal describes how to accomplish this goal. Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

10 Channel Access Rule of Current Wi-Fi System
Month Year doc.: IEEE yy/xxxxr0 September 2015 Channel Access Rule of Current Wi-Fi System Packet detected && RSSI >= THD Packet detection Channel Assessment result Normal CS CCA threshold is set to -82 dBm for 20MHz RSSI packet Channel Assessment is high if detection criteria pass Channel Assessment result Time Packet detection in 4us Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

11 11ax Channel Access Rule – Stage 1
Month Year doc.: IEEE yy/xxxxr0 September 2015 11ax Channel Access Rule – Stage 1 An STA has frame to send starting the transmission process according to the backoff procedure, (current) “If the medium is determined to be busy at any time during a backoff slot, then the backoff procedure is suspended;” and (new) The STA continue to decode the frame and determines whether the detected frame is an inter or intra frame By using BSS color (in SIG-A) or MAC address (in MAC header) With rules to ensure that all 11ax STAs can make the decision in a consistent manner (current) If the detected frame is a intraBSS frame, continue to follow the channel access rule “The medium shall be determined to be idle for the duration of a DIFS period or EIFS, as appropriate (see ), before the backoff procedure is allowed to resume.” Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

12 11ax Channel Access Rule – Stage 2
Month Year doc.: IEEE yy/xxxxr0 September 2015 　11ax Channel Access Rule – Stage 2 (new) If the detected frame is a interBSS frame (new) Under TBD condition, increase CCA threshold, level B, and if CCA detection indicates the channel is idle (current) resume the countdown process after the medium is idle for the duration of a DIFS period or EIFS, as appropriate (see ) Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

13 September 2015 Initial thd level A = -82dBm Inter thd level C = -62dBm
Month Year doc.: IEEE yy/xxxxr0 September 2015 An STA follows the back off process and determines the channel is busy, level A is used for CCA threshold. In this example, input RSSI(-72dBm) is higher than level A (-82dBm). Channel sensing is high (busy) in this time period. Suspend countdown process. Not knowing whether it is a Intra or Inter frame at this time. (The diagram below is for inter frame only. There is no change of the process for intra frame) Initial thd level A = -82dBm Inter thd level C = -62dBm Input RSSI = -72dBm Countdown counter = 0` STA decodes MAC header and determines it is an inter BSS legacy frame. If Channel sensing result is idle (due to higher CCA threshold, level C -62 dBm), resume the countdown process after the medium is idle for the duration of a DIFS period or EIFS. Otherwise continue to suspend the countdown process The STA decodes SIG-A, ex. BSS color, and determines it is a inter BSS frame. New behavior STA transmits its frame Inter BSS 11ax frame Inter BSS (legacy) frame Current behavior Channel sensing result Incoming Frame ( -72dBm) Channel sensing detection in 4us Time Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

14 Benefit of the Proposed 11ax Channel Access Rule
Month Year doc.: IEEE yy/xxxxr0 September 2015 Benefit of the Proposed 11ax Channel Access Rule A simple and effective channel access rule to facilitate spatial re-use, mostly following the channel access rule Benefit STAs close to the edge of a BSS An STA can resume the countdown sooner once it determines the detected frame is a interBSS frame and the channel is idle due to the higher CCA threshold set for interBSS frame The interBSS and IntraBSS frames transmission may overlap in time and achieve spatial re-use Since the 11ax STAs transmitting frame overlapping (in time) with another BSS do not follow the observed TXOP of OBSS frame. It does not affect the OBSS STAs but may be unfair to legacy STAs of the BSS A possible solution is not transmitting frame cross observed TXOP boundary May also employ TPC to mitigate the interference between inter and intra frame transmissions The downside is an STA have to continue to decode the frame until it can determine where is the frame from. Only the STA want to participate in spatial re-use need to do it Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

15 Month Year doc.: IEEE yy/xxxxr0 September 2015 　 Straw Poll Move to add deferral rules and levels section to the spec framework The STA determines whether the detected frame is an inter-BSS or an intra-BSS frame by using BSS color (in SIG-A) or MAC address in the MAC header. If the detected frame is an inter-BSS frame, under TBD condition, uses TBD OBSS PD level that is greater than the minimum receive sensitivity level NOTE–Maybe extra rules need to be added to ensure that all 11ax STAs can make the decision in a consistent manner. Chao-Chun Wang al, MediaTek Inc. Chinghwa Yu, MediaTek

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