Mandated Response MCS
This document, dated January 2017, relates to IEEE 802.11 standards and discusses a mandated response regarding MCS dates. The authors, Matthew Fischer of Broadcom, provide their affiliations and contact details.
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January 2017 doc.: IEEE 802.11-17/0118r0 Mandated Response MCS Date: 2017-01-16 Authors: Name Affiliations Address Phone email 190 Mathilda Place, Sunnyvale, CA 94086 +1 408 543 3370 Matthew Fischer Broadcom mfischer@broadcom.com Submission Slide 1 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 Abstract Desire to have transmitter dictate response MCS Because the link can be asymmetric due to TX power: a) e.g. mobile devices have lower TX power b) different modulation can have different TX power If response rate is higher than reverse link can support, then response frame gets lost at transmitter side and causes retransmission (packet loss and/or data rate drops) Submission Slide 2 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 CID 8099 Due to power differences and other considerations, a situation can arise when the transmitter of a response frame using the standard required response MCS value is employing an MCS that will not work for the link because of the asymmetry, e.g. tx power asymmetry. Allow a STA to dictate the response PPDU MCS to avoid this problem. Allow the transmitter of a response eliciting MPDU to include an indication of an appropriate MCS for the response MPDU. Expect a submission detailing some changes. Submission Slide 3 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 New A-control ID Table 9-18a Control ID subfield values Length of the Control Information subfield (bits) Control ID value Meaning Content of the Control Information subfield 0 UL MU response scheduling 26 See 9.2.4.6.4.2 (UL MU response scheduling) See 9.2.4.6.4.3 (Operating Mode(#2209)) See 9.2.4.6.4.4 (HE link adaptation) 1 Operating Mode(#2209) 16 2 HE link adaptation TBD 3 Buffer Status Report (BSR)(#824) UL Power Headroom(#340) 26 See 9.2.4.6.5 (Buffer Status Report (BSR)(#824)) See 9.2.4.6.5.1 (UL power headroom) 4 8 5 Response MCS Index 4 MCS Index that is used for the frame that is a response to the frame containing this A-control field 5-15 Reserved Add a new A-control field value Submission Slide 4 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 MCS Index Encoding MCI Value Constellation, Encoding 0 BPSK, 1 QPSK 2 QPSK 3 16QAM 4 16 QAM 5 64QAM 2/3 6 64 QAM 7 64 QAM 5/6 8 256 QAM 9 256 QAM 5/6 10 1024 QAM 11 1024 QAM 5/6 12 15 Reserved BW Independent Submission Slide 5 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 Recipient Behavior Recipient shall respond with acknowledgement that uses the modulation and coding specified in the A- Control field Submission Slide 6 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 Straw Poll 1 Do you support adding a new A-control subfield ID and interpretation which includes the ability for a soliciting frame to dictate the response MCS, as outlined in the previous slides? Yes No Abstain Submission Slide 7 Matthew Fischer (Broadcom)
January 2017 doc.: IEEE 802.11-17/0118r0 References [1] 802.11-2016.pdf [2] Draft P802.11ax_D1.0.pdf Submission Slide 8 Matthew Fischer (Broadcom)
