IEEE 802.11-21/0344r3 Compressed Supported MCS and Nss Set Field Overview
Explore the evolution of IEEE 802.11 standards with a focus on the Compressed Supported MCS and Nss Set Field. Discover key updates and proposed encoding approaches for enhanced efficiency and performance. Dive into the intricacies of HE Encoding and EHT Encoding as discussed in the document.
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March 2021 doc.: IEEE 802.11-21/0344r3 Compressed Supported MCS and Nss Set Field Date: 2021-03-10 Authors: Name Affiliations Address Phone email Steve Shellhammer shellhammer@ieee.org Bin Tian Youhan Kim btian@qti.qualcomm.com youhank@qti.qualcomm.com Qualcomm Rui Cao rui.cao_2@nxp.com NXP Liwen Chu liwen.chu@nxp.com Submission Slide 1 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Feedback Received Received feedback on two areas when presented earlier 1. For 320 MHz STAs include the fields for 80, 160 and 320 MHz and not just 160 and 320 MHz 2. Modify the design to treat 20 MHz-Only STAs different than 80 MHz STAs, so that the 80 MHz STAs cannot signal that they only support MCS 0-7, versus the mandatory MCS 0-9 Updates have been made to consider the feedback received Submission Slide 2 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Background The 802.11ax Supported MCS and Nss Set Field requires up to 12 Octets If we use a similar format in 802.11be we will require 12 octets in 802.11be for R1 and when we extent to 16 spatial streams in R2 we will require an additional 12 octets, for a total of 24 octets in 802.11be Submission Slide 3 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Compressed Supported MCS and Nss Set Field We will show an alternative format which requires at most 7 octets for EHT R1 & R2 We will provide a few illustrations showing the difference between the approach used in 802.11ax and the approach proposed here Submission Slide 4 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 HE Encoding Approach MCS 10-11 MCS 8-9 MCS 0-7 None 1 SS 2 SS 3 SS 4 SS 5 SS 6 SS 7 SS 8 SS Legend Signaled in HE Supported MCS and Nss Set Field Each column is encoded using 2 bits o Indicates the max MCS supported for each number of spatial streams, from 1 to 8 o This requires ? ? = ?? bits = 2 octets, for each BW and for both TX and RX Submission Slide 5 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Proposed EHT Encoding Approach MCS 12-13 MCS 10-11 MCS 8-9 MCS 0-7 0 SS 1 SS 2 SS 3 SS 4 SS 5 SS 6 SS 7 SS 8 SS 9 SS 10 SS 11 SS 12 SS 13 SS 14 SS 15 SS 16 SS Legend EHT Signaling Required Propose encoding by row o For each MCS set, specify the maximum Nss supported Submission Slide 6 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Row Encoding Proposal 4-bit field value Max Number of Nss that supports the specified EHT-MCS 0 Not supported 1 1 2 2 8 8 9 Reserved 15 Reserved Each Row requires a 4-bit field Can be extended to support 16 SS in R2 Submission Slide 7 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Extension to Support 16 SS in R2 In R2 we can update the table entries as such 4-bit field value Max Number of Nss that supports the specified EHT-MCS 0 Not supported 1 1 2 2 8 8 9 9 A STA that supports a given MCS for 15 spatial streams also supports it for 16 spatial streams 13 13 14 14 15 16 Submission Slide 8 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Option 1 Separate Field for 20 MHz-Only STAs EHT MCS Map (BW = 20 MHz) EHT MCS Map (BW = 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 0 or 3 0 or 3 0 or 3 0 or 4 Maximum Supported Bandwidth Fields Transmitted Octets Required 20 MHz-Only EHT MCS Map (BW = 20 MHz) 4 80 MHz EHT MCS Map (BW = 80 MHz) 3 160 MHz EHT MCS Map (BW = 80 MHz) EHT MCS Map (BW = 160 MHz) 6 320 MHz EHT MCS Map (BW = 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) 9 This Option prevents an 80 MHz STA from signaling that it only supports MCS 0-7, and not MCS 8-9 Submission Slide 9 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Option 2 20 MHz-Only STAs incorporated into BW 80 MHz EHT MCS Map (BW 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 4 0 or 3 0 or 3 Maximum Supported Bandwidth Fields Transmitted Octets Required EHT MCS Map (BW 80 MHz) 20 MHz-Only or 80 MHz 4 EHT MCS Map (BW 80 MHz) EHT MCS Map (BW = 160 MHz) 160 MHz 7 EHT MCS Map (BW 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) 320 MHz 10 This Option does not prevent an 80 MHz STA from signaling that it only supports MCS 0-7, and not MCS 8-9 Submission Slide 10 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Detailed MCS Map Subfields Three MCS Sets: MCS 0-9, MCS 10-11, MCS 12-13 RX Max Nss that supports EHT-MCS 0-9 TX Max Nss that supports EHT-MCS 0-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 Bits: 4 4 4 4 4 4 Four MCS Sets: MCS 0-7, MCS 8-9, MCS 10-11, MCS 12-13 RX Max Nss that supports EHT-MCS 0-7 TX Max Nss that supports EHT-MCS 0-7 RX Max Nss that supports EHT-MCS 8-9 TX Max Nss that supports EHT-MCS 8-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 4 4 4 4 4 4 Bits: 4 4 Submission Slide 11 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Basic EHT-MCS and Nss Set Field We also believe this approach makes sense of the Basic EHT- MCS and Nss Set Field We propose the following format for the Basic EHT-MCS and Nss Set Field o Includes all four MCS Sets: MCS 0-7, MCS 8-9, MCS 10-11 and MCS 12-13 RX Max Nss that supports EHT-MCS 0-7 TX Max Nss that supports EHT-MCS 0-7 RX Max Nss that supports EHT-MCS 8-9 TX Max Nss that supports EHT-MCS 8-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 4 4 4 4 4 4 Bits: 4 4 Submission Slide 12 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Straw Poll #1 For the Supported MCS and Nss Set field, do you agree to signal the maximum number of spatial streams supported for a given MCS set, using the table below? o Note: This can be extended to support up to 16 spatial streams in R2 4-bit field value Max Number of Nss that supports the specified EHT-MCS 0 Not supported 1 1 2 2 8 8 9 Reserved 15 Reserved Submission Slide 13 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Straw Poll #2 Which Option do you prefer for handling the 20 MHz-Only STAs? Option #1 o Separate Field for 20 MHz-Only STAs EHT MCS Map (BW = 20 MHz) EHT MCS Map (BW = 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 0 or 3 0 or 3 0 or 3 0 or 4 Option #2 o 20 MHz-Only incorporated into (BW 80 MHz) EHT MCS Map (BW 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 4 0 or 3 0 or 3 Submission Slide 14 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Straw Poll #3a (If Option 1 is Preferred) Do you support the following Supported MCS and Nss Set Field and the EHT-MCS Map Subfield format? Supported MCS and Nss Set Field EHT MCS Map (BW = 20 MHz) EHT MCS Map (BW = 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 0 or 3 0 or 3 0 or 3 0 or 4 EHT-MCS Map Subfield Format (BW = 80/160/320 MHz) RX Max Nss that supports EHT-MCS 0-9 TX Max Nss that supports EHT-MCS 0-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 Bits: 4 4 4 4 4 4 EHT-MCS Map Subfield Format (BW = 20 MHz) RX Max Nss that supports EHT-MCS 0-7 TX Max Nss that supports EHT-MCS 0-7 RX Max Nss that supports EHT-MCS 8-9 TX Max Nss that supports EHT-MCS 8-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 4 4 4 4 4 4 Bits: 4 4 Submission Slide 15 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Straw Poll #3b (If Option 2 is Preferred) Do you support the following Supported MCS and Nss Set Field and the EHT-MCS Map Subfield format? Supported MCS and Nss Set Field EHT MCS Map (BW 80 MHz) EHT MCS Map (BW = 160 MHz) EHT MCS Map (BW = 320 MHz) Octets: 4 0 or 3 0 or 3 EHT-MCS Map Subfield Format (BW = 160/320 MHz) RX Max Nss that supports EHT-MCS 0-9 TX Max Nss that supports EHT-MCS 0-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 Bits: 4 4 4 4 4 4 EHT-MCS Map Subfield Format (BW 80 MHz) RX Max Nss that supports EHT-MCS 0-7 TX Max Nss that supports EHT-MCS 0-7 RX Max Nss that supports EHT-MCS 8-9 TX Max Nss that supports EHT-MCS 8-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 4 4 4 4 4 4 Bits: 4 4 Submission Slide 16 Steve Shellhammer (Qualcomm)
March 2021 doc.: IEEE 802.11-21/0344r3 Straw Poll #4 Do you support the Basic EHT-MCS And MCS Set Field format show below? RX Max Nss that supports EHT-MCS 0-7 TX Max Nss that supports EHT-MCS 0-7 RX Max Nss that supports EHT-MCS 8-9 TX Max Nss that supports EHT-MCS 8-9 RX Max Nss that supports EHT-MCS 10-11 TX Max Nss that supports EHT-MCS 10-11 RX Max Nss that supports EHT-MCS 12-13 TX Max Nss that supports EHT-MCS 12-13 4 4 4 4 4 4 Bits: 4 4 Submission Slide 17 Steve Shellhammer (Qualcomm)
