DMG Base MCS and Length Supplementary Slides

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DMG Base MCS and Length Supplementary Slides May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 DMG Base MCS and Length Supplementary Slides Date: 2016-05-17 Authors: Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 Abstract The current text in draft D5.3 of REVmc defines the Base MCS and Length field in the PHY SC header for extended MCS. But the formula for Length field value causes duration calculation error for some Ns (number of PSDU octets.) The submission 11-16/0670r2 proposes modified text to fix it. This submission includes supplementary slides for 11- 16/0670r2. Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

duration calculation error May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 duration calculation error STAs without Extended SC MCS support miscalculate the PPDU duration for some Ns (number of octets). Such error may cause potential risks for fairness and interoperability on backoff procedures. Actual MCS Actual PPDU duration MCS9.1 N = 70 Preamble/Header Payload 3.09 usec Header value (Spoofed) Calculated PPDU duration MCS6 Length 40 Preamble/Header Payload formula on REVmc D5.3 2.80 usec +0.29 usec duration error -0.58us ~ 0.29us Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

Proposed Modification - MCS May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 Proposed Modification - MCS MCS 6 to 12 are used for spoofing in natural (ascending) order Extended MCS value in MCS field 9.1 6 12.1 7 12.2 8 12.3 9 12.4 10 12.5 11 12.6 12 Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

Proposed Modification - Length May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 Proposed Modification - Length Based on number of symbol blocks Avoid error caused by number of parity bits Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

Proposed Modification - SI May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 Proposed Modification - SI Additional information to recover actual number of octets in PPDU is transmitted with 2bits of SI (Similar to [2] 11-16/0220r3) Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic

References [1] Draft P802.11REVmc_D5.3 May 2016 doc.: IEEE 802.11-16/0707r0 May 2016 References [1] Draft P802.11REVmc_D5.3 [2] 11-16/0220r3 Clause 20 SC MCS Extension [3] 11-16/0233r0 Additional SC MCSs in clause 20 (DMG PHY) [4] 11-16/0670r2 Base MCS and Length Calculation for Extended MCS Set Hiroyuki Motozuka, Panasonic Hiroyuki Motozuka, Panasonic