doc.: IEEE /1103r0 Submission September 2015 Chittabrata Ghosh, et al. (Intel)Slide 1 DL Sounding Sequence with UL MU Feedback Date: Authors: NameAffiliationAddressPhone Chittabrata Ghosh Intel 2200 Mission College Blvd., Santa Clara, CA 95054, USA Robert Stacey Eldad Perahia Shahrnaz Azizi Po-Kai Huang Qinghua Li Laurent Cariou Xiaogang Chen Rongzhen Yang Yaron Alpert Avi Mansour

doc.: IEEE /1103r0 SubmissionSlide 2 Authors (continued) NameAffiliationAddressPhone Albert Van Zelst Qualcomm Straatweg 66-S Breukelen, 3621 BR Netherlands Alfred Asterjadhi 5775 Morehouse Dr. San Diego, CA, USA Bin Tian 5775 Morehouse Dr. San Diego, CA, USA Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA George Cherian 5775 Morehouse Dr. San Diego, CA, USA Gwendolyn Barriac 5775 Morehouse Dr. San Diego, CA, USA Hemanth Sampath 5775 Morehouse Dr. San Diego, CA, USA Menzo Wentink Straatweg 66-S Breukelen, 3621 BR Netherlands Richard Van Nee Straatweg 66-S Breukelen, 3621 BR Netherlands Rolf De Vegt 1700 Technology Drive San Jose, CA 95110, USA Sameer Vermani 5775 Morehouse Dr. San Diego, CA, USA Simone Merlin 5775 Morehouse Dr. San Diego, CA, USA Tevfik Yucek 1700 Technology Drive San Jose, CA 95110, USA VK Jones 1700 Technology Drive San Jose, CA 95110, USA Youhan Kim 1700 Technology Drive San Jose, CA 95110, USA Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 SubmissionSlide 3 Authors (continued) NameAffiliationAddressPhone Ron Porat Broadcom Matthew Fischer Sriram Venkateswaran Tu Nguyen Vinko Erceg Kiseon Ryu LG Electronics 19, Yangjae-daero 11gil, Seocho-gu, Seoul , Korea Jinyoung Chun Jinsoo Choi Jeongki Kim Suhwook Kim Hyeyoung Choi Dongguk Lim Eunsung Park Jinmin Kim HanGyu Cho Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 SubmissionSlide 4 Authors (continued) NameAffiliationAddressPhone Phillip Barber Huawei The Lone Star State, TX ch.com Peter Loc Le Liu F1-17, Huawei Base, Bantian, Shenzhen Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Yi Luo F1-17, Huawei Base, Bantian, Shenzhen Yingpei Lin 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Jiyong Pang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Zhigang Rong Telesis Court, Suite 365, San Diego, CA NA Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada David X. Yang F1-17, Huawei Base, Bantian, Shenzhen Yunsong Yang Telesis Court, Suite 365, San Diego, CA NA Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 SubmissionSlide 5 Authors (continued) Chittabrata Ghosh, et al. (Intel) September 2015 NameAffiliationAddressPhone Hongyuan Zhang Marvell 5488 Marvell Lane, Santa Clara, CA, Yakun Sun Lei Wang Liwen Chu Jinjing Jiang Yan Zhang Rui Cao Sudhir Srinivasa Saga Tamhane Mao Yu Edward Au Hui-Ling Lou Thomas DerhamOrange Brian Hart Cisco 170 W Tasman Dr, San Jose, CA Pooya Monajemi

doc.: IEEE /1103r0 SubmissionSlide 6 Authors (continued) NameAffiliationAddressPhone 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 (972) Mark Rison Innovation Park, Cambridge CB4 0DS (U.K.) Rakesh Taori 1301, E. Lookout Dr, Richardson TX (972) Sanghyun Chang Maetan 3-dong; Yongtong-Gu Suwon; South Korea 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 com Haralabos Papadopoulos tions.com Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 SubmissionSlide 7 Authors (continued) NameAffiliationAddressPhone James Yee Mediatek No. 1 Dusing 1 st Road, Hsinchu, Taiwan Alan Jauh Chingwa Hu m Frank Hsu Thomas Pare Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA ChaoChun Wang om James Wang Jianhan Liu Tianyu Wu Russell Huang m Bo Sun ZTE #9 Wuxingduan, Xifeng Rd., Xi’an, China Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 SubmissionSlide 8 NameAffiliationAddressPhone Joonsuk Kim Apple Cupertino, CA Aon Mujtaba Guoqing Li Eric Wong Chris Hartman Authors (continued) Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 Submission Abstract In this contribution, we introduce the DL sounding sequence with UL MU feedback report from STAs Slide 9Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 Submission UL MU features in 11ax PAR and SFD In the 11ax PAR [1], –This project may include the capability to handle multiple simultaneous communications in both the spatial and frequency domains, in both the UL and DL. The sounding protocol is in the IEEE ax SFD [2] –The amendment shall include a CSI feedback mechanism which allows for a minimum feedback granularity of less than 20 MHz. [MU Motion 9, July 16, 2015, see [29]] In this contribution, we introduce the DL sounding sequence using the Trigger frame-based UL MU procedure Slide 10Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 Submission Baseline 11ac Sounding Protocol with Sequence of Beamformees The sounding sequence initiates with NDP Announcement frame –STA Info field(s) identifies the STAs from which the AP request beamforming feedback After SIFS interval, VHT NDP frame is transmitted by the AP –First or only STA sends the VHT Compressed Beamforming Feedback frame after SIFS time of the NDP frame transmission Pair of VHT Beamforming Poll Report and Compressed Beamforming Feedback frames are exchanged with remaining STAs Slide 11 September 2015 Chittabrata Ghosh, et al. (Intel)

doc.: IEEE /1103r0 Submission Illustration of Baseline 11ac DL Sounding Protocol with Multiple Beamformees Slide 12 Polling phase of sounding protocol First beamformee responds with Feedback frame NDP Announcement initiates sounding sequence September 2015 Chittabrata Ghosh, et al. (Intel)

doc.: IEEE /1103r0 Submission UL MU Procedure defined in 11ax SFD [2] AP transmits a Trigger frame soliciting the transmission of UL MU PPDU from multiple STAs. STAs transmit UL MU (OFDMA or MU-MIMO) PPDU as immediate response to the Trigger frame. AP transmits acknowledgement frame in response to UL MU PPDU. Slide 13 September 2015 Chittabrata Ghosh, et al. (Intel)

doc.: IEEE /1103r0 Submission Proposed DL Sounding Sequence with UL MU Feedback While 11ax can still use the baseline sounding process similar to 11ac, to improve the efficiency we propose a new sounding sequence using trigger-based UL MU procedure for feedback report collection The AP (beamformer) initiates DL sounding with NDP Announcement (NDP-A) frame The AP sends the HE NDP frame in SIFS time –Format of the HE NDP frame is TBD The AP sends a Trigger frame following SIFS time after the HE- NDP frame STAs with allocated resources indicated in Trigger frame responds with UL MU Beamforming Feedback frames Slide 14 September 2015 Chittabrata Ghosh, et al. (Intel)

doc.: IEEE /1103r0 Submission Illustration of DL Sounding Sequence Slide 15 NDP-A Trigger Frame Beamformer Beamformee 1 Beamformee 2 Beamforming Feedback frame Beamformee 3 NDP September 2015 Beamforming Feedback frame Chittabrata Ghosh, et al. (Intel)

doc.: IEEE /1103r0 Submission Summary In this presentation, we proposed the DL sounding sequence with UL MU feedback reports from STAs Slide 16Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 Submission References [1] IEEE /0165r1 “ HEW SG Proposed PAR” [2] IEEE /0132r2 “Specification Framework for Tax” Slide 17Chittabrata Ghosh, et al. (Intel) September 2015

doc.: IEEE /1103r0 Submission Straw-poll 1 Do you agree to include the DL sounding sequence illustrated in Slide 15 to the spec framework? Yes: No: Abstain Slide 18 September 2015 Chittabrata Ghosh, et al. (Intel)