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Triggered OFDMA Random Access Observations
Month Year Doc Title September 2015 Triggered OFDMA Random Access Observations Date: Authors: Name Affiliation Address Phone Russell Huang Mediatek USA 2860 Junction Ave, San Jose, CA 95134, USA ChaoChun Wang Tianyu Wu Jianhan Liu James Wang Thomas Pare James Yee No. 1 Dusing 1st Road, Hsinchu, Taiwan Alan Jauh Chingwa Hu Frank Hsu Guoqing LI Apple 1 Infinite Loop Cupertino, CA 95014 Joonsuk Kim Eric Wong Chris Hartman Russell Huang, MediaTek
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2111 NE 25th Ave, Hillsboro OR 97124, USA
Month Year doc.: IEEE yy/xxxxr0 September 2015 Authors (continued) Name Affiliation Address Phone Kazuyuki Sakoda Sony Electronics 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 Russell Huang, MediaTek Hongyuan Zhang, Marvell; etc.
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5488 Marvell Lane, Santa Clara, CA, 95054
Month Year doc.: IEEE yy/xxxxr0 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 Russell Huang, MediaTek Hongyuan Zhang, Marvell; etc.
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Authors (continued) September 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 Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen Junghoon Suh Jiayin Zhang Russell Huang, MediaTek
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Authors (continued) September 2015 Albert Van Zelst Alfred Asterjadhi
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 Russell Huang, MediaTek
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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 Russell Huang, MediaTek
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Authors (continued) September 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 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 Russell Huang, MediaTek
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Authors (continued) September 2015 Kiseon Ryu LG Electronics
Name Affiliation Address Phone 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 Bo Sun ZTE #9 Wuxing duan, Xifeng Rd, Xi’an, China Kaiying Lv Yonggang Fang Ke Yao Weimin Xing Russell Huang, MediaTek
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Overview of the Triggered OFDMA Random Access
September 2015 Overview of the Triggered OFDMA Random Access STAs start UL MU operation after AP sends the trigger frames For random access cases, STAs randomly access an RU by using a certain randomization algorithm. Efficiency is one of the metrics to justify the OFDMA random access mechanisms. Efficiency = number of resource units with successful transmission/all resource units Russell Huang, MediaTek
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Review - CSMA vs. Slotted ALOHA
September 2015 Review - CSMA vs. Slotted ALOHA Random access can be CSMA or slotted ALOHA CSMA/CA has better efficiency than slotted ALOHA. Reason: CSMA uses a much smaller slot (different than slotted ALOHA’s slot) to do the carrier sensing before transmission. Using CSMA for MU OFDMA on UL complicates the receiver design. STAs transmitting at different time in separate sub-channels is a hard problem for the design of the AP’s receiver. Slotted ALOHA in OFDMA random access. Packets are transmitted in RUs randomly selected by STAs With traffic following Poisson arrival, the throughput is Ge-G. (P(k=1) = λke- λ/k!). The optimal value is .368 Russell Huang, MediaTek
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To Achieve The Best Efficiency
September 2015 To Achieve The Best Efficiency Efficiency depends on the traffic load. Usually randomization is used to tune the traffic load. 36.8% of efficiency is acceptable as long as the system can achieve it consistently. Randomization approaches to tuning the traffic Backoff mechanism (backoff counter picked in the range of 0 and CW) [1] Transmission probability control (the example of this contribution) Etc. Overall traffic and collisions status information in OFDMA random access is difficult for individual STAs to obtain, but easy for AP. With traffic estimation, AP can determine the optimal value of the traffic tuning parameter so that optimal efficiency can be achieved. Russell Huang, MediaTek
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Randomization Parameter Broadcasting
September 2015 Randomization Parameter Broadcasting AP broadcasts the randomization parameter(s) to the STAs, which can be Contention window size Transmission probability Etc. The AP can broadcast it in Beacons, less overhead Trigger frame, more adaptive We propose AP broadcast the parameter(s) in the trigger frame. Russell Huang, MediaTek
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September 2015 Strawpoll 1 Do you support to let AP broadcast a TBD parameter in the trigger frame to the STAs so that STAs can initiate the random access process after the trigger frames? Yes No Abs Russell Huang, MediaTek
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September 2015 Reference [1] UL OFDMA-based Random Access Procedure, doc.: IEEE /1105r0 Russell Huang, MediaTek
![September 2015 Reference. [1] UL OFDMA-based Random Access Procedure, doc.: IEEE /1105r0.](http://slideplayer.com/slide/16299180/95/images/14/September+2015+Reference.+%5B1%5D+UL+OFDMA-based+Random+Access+Procedure%2C+doc.%3A+IEEE+%2F1105r0..jpg "Russell Huang, MediaTek.")
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