PHY Padding Remaining Issues

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Presentation transcript:

PHY Padding Remaining Issues Mar. 2016 PHY Padding Remaining Issues Date: 2016-03-14 Authors: Hongyuan Zhang, Marvell, et. al.

2111 NE 25th Ave, Hillsboro OR 97124, USA Mar. 2016 Authors (continued) Name Affiliation Address Phone Email Ron Porat Broadcom rporat@broadcom.com Matthew Fischer mfischer@broadcom.com Sriram Venkateswaran Zhou Lan Leo Montreuil Andrew Blanksby Vinko Erceg Robert Stacey Intel 2111 NE 25th Ave, Hillsboro OR 97124, USA +1-503-724-893 robert.stacey@intel.com Eldad Perahia eldad.perahia@intel.com Shahrnaz Azizi shahrnaz.azizi@intel.com Po-Kai Huang po-kai.huang@intel.com Qinghua Li quinghua.li@intel.com Xiaogang Chen xiaogang.c.chen@intel.com Chitto Ghosh chittabrata.ghosh@intel.com Rongzhen Yang rongzhen.yang@intel.com Laurent cariou laurent.cariou@intel.com Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Authors (continued) Hongyuan Zhang, Marvell, et. al.

Authors (continued) Mar. 2016 James Yee Mediatek Name Affiliation Address Phone Email James Yee Mediatek No. 1 Dusing 1st Road, Hsinchu, Taiwan +886-3-567-0766 james.yee@mediatek.com Alan Jauh alan.jauh@mediatek.com Frank Hsu frank.hsu@mediatek.com Thomas Pare USA 2860 Junction Ave, San Jose, CA 95134, USA +1-408-526-1899 thomas.pare@mediatek.com ChaoChun Wang chaochun.wang@mediatek.com James Wang james.wang@mediatek.com Jianhan Liu Jianhan.Liu@mediatek.com Tianyu Wu tianyu.wu@mediatek.com Russell Huang russell.huang@mediatek.com Brian Hart Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 brianh@cisco.com Pooya Monajemi pmonajem@cisco.com Joonsuk Kim Apple joonsuk@apple.com Aon Mujtaba mujtaba@apple.com Guoqing Li guoqing_li@apple.com Eric Wong ericwong@apple.com Chris Hartman chartman@apple.com Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Authors (continued) Hongyuan Zhang, Marvell, et. al.

#9 Wuxing duan, Xifeng Rd, Xi’an, China Mar. 2016 Authors (continued) Bo SunBo Sun ZTE #9 Wuxing duan, Xifeng Rd, Xi’an, China SubSub.bo1@zte.com.cn Kaiying Lv lv.kaiying@zte.com.cn Yonggang Fang yfang@ztetx.com Ke Yao Yao.ke5@zte.com.cn Weimin Xing Xing.weimin@zte.com.cn Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Authors (continued) Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Authors (continued) Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Authors (continued) Hongyuan Zhang, Marvell, et. al.

Mar. 2016 Overview 11ax has decided PHY padding and PE mechanism for SU, DL-MU and UL-MU, with detailed math. Some leftover issues: 1. DCM: parameter setting and non-integer NDBPS.short for 26-tone RU. 2. Post-FEC padding bit definition: random-vs-known-vs-repeat. 3. PE Field Definition: random-vs-known Hongyuan Zhang, Marvell, et. al.

Mar. 2016 I. DCM For DCM, 2 data tones are used to jointly transmit the bits of one constellation, meanwhile “NCBPS” still indicates “number of coded bits per symbol”, therefore it is mathematically convenient to define NSD/NSD.short being ½ of normal non-DCM cases, for the same MCS. In 26-tone RU, if NSD.short = 3, when MCS0-DCM is introduced, NDBPS.short = ½*NSD.short is a non-integer, i.e. NDBPS = 6, therefore not able to be evenly distributed in the 4 symbol segments of the last symbol. Other RUs and other DCM-supported MCSs have no issue. Hongyuan Zhang, Marvell, et. al.

Solution Propose to define NSD.short = 2 for 26-tone RU when DCM=1. Mar. 2016 Solution Propose to define NSD.short = 2 for 26-tone RU when DCM=1. Equivalently, the bit distribution of the last symbol for MCS0-DCM is [1 1 1 3] for the 4 segments. Same NSD.short is also applied to MCS1,3,4 with DCM, for consistency. Although not evenly distributed, it maintains all the math in the padding procedure and makes no exceptions—important for implementation/verification phases. RU Size DCM=0: NSD.short DCM=1: NSD.short 26 6 2 52 12 106 24 242 60 30 484 120 996 240 996x2 492 246 Hongyuan Zhang, Marvell, et. al.

II. Post-FEC padding Bits and PE Definitions Mar. 2016 II. Post-FEC padding Bits and PE Definitions We have not decided what bits are used for post-FEC paddings, and also the content of PE. It is better that the spec does NOT specify those bits, because post-FEC padding and PE are supposed to be ignored by the receiver and buy more processing time. Hongyuan Zhang, Marvell, et. al.

Mar. 2016 SP1 Do you agree to replace Table-3 NSD.short in 3.3.5 Padding and packet extension of SFD to the following table? RU Size DCM=0: NSD.short DCM=1: NSD.short 26 6 2 52 12 106 24 242 60 30 484 120 996 240 996x2 492 246 Hongyuan Zhang, Marvell, et. al.

SP2 Do you agree to add the following text in SFD 3.3.5 Mar. 2016 SP2 Do you agree to add the following text in SFD 3.3.5 The post-FEC bits are un-specified by 11ax spec The content of PE field is un-specified by 11ax spec Hongyuan Zhang, Marvell, et. al.