Defining DCM for New RU/M-RU Sizes in IEEE 802.11 Standard
Explore the proposal to define DCM operations for new RU/M-RU sizes in the IEEE 802.11 standard, specifically focusing on the allocation of subcarriers within different segments and the use of segment parsers for efficient bit distribution. The presentation addresses TBDs related to DCM transmissions and suggests defining interleaver/DTM for various RU sizes to enhance performance and compatibility. Simulation results indicate insensitivity to parameter selection, supporting the efficiency of the proposed DCM implementations.
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Presentation Transcript
July, 2020 doc.: IEEE 802.11-20/1119r0 Remaining TBDs on DCM Date: 2020-07-20 Authors: Name Affiliations Address Phone Email Bin Tian btian@qti.qualcomm.com Sameer Vermani Alice Chen Qualcomm Lin Yang Youhan Kim Submission Slide 1 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 Introduction It has been proposed in [1] that DCM+MCS0 will be supported in 11be for 1ss In this presentation we want to resolve some TBDs related to the DCM transmissions Submission Slide 2 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 New RU/M-RU Size to Define DCM 11ax defines DCM operation up to RU 996x2 (160 MHz) Suggest 11be defining DCM on all RU and M-RU size <= 996x2 plus RU 996x3 and 996x4 New M-RU size <= 80 MHz: RU78, RU132 and RU726 Need to define interleaver/DTM New M-RU size > 80 MHz: RU 996+484, RU 996+(484+242), RU 996x2, RU996x3 and RU 996x4 Need to define DCM operation and update segment parser Submission Slide 3 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 Interleaver and DTM for RU/MRU < 80MHz NSD BCC NCOL BCC NROT LDPC DTM No DCM No DCM No DCM No DCM DCM DCM DCM DCM RU26 24 12 8 4 2 - 1 1 RU52 48 24 16 8 11 - 3 1 RU78 12 3 72 36 18 18 - 4 RU106 102 51 17 17 29 - 6 3 RU132 126 63 21 21 31 - 6 3 RU242 234 117 26 13 58 - 9 9 RU484 468 234 - - - - 12 9 RU726 702 351 - - - - 18 9 RU996 Simulation results show the performance not sensitive to the parameter selection [2] 980 490 - - - - 20 14 Submission Slide 4 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 DCM for RU996x2 in 11ax For 996x2, NSD= 980 for DCM=1 In essence, DCM subcarriers mapping is limited within each 80 MHz segment Submission Slide 5 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 DCM for New RU/M-RU size >996 New RU/M-RU size >996 to define DCM RU 996+484, RU996+(484+242), RU 3x996, RU4x996, Propose Use segment parser to distribute bits to each segment Proportional round robin scheme Perform DCM mapping on the per 80MHz Nsd_k, k is the index of 80MHz segment E.g. for RU 996 +(484+242) , the Nsd_1, Nsd_2, can be 490, 351 with DCM=1 Submission Slide 6 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 BCC Per Symbol Padding Just like for RU106 and RU242, NSD of RU132 is odd number for DCM case In 11be, DCM only applies to MCS0 and 1ss. It requires even number of coded bits per OFDM symbol Same as in 11ax, one padding bit is added after 2 x NDBPS coded bit for RU132 NSD No DCM DCM RU26 24 12 RU52 48 24 RU78 72 36 RU106 102 51 RU132 126 63 RU242 234 117 RU484 468 234 RU726 702 351 RU996 980 490 Submission Slide 7 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 SP 1 Do you support 11be to define DCM for RU/M-RU size <= 996x2 plus RU 996x3 and 996x4 Y/N/ABS Submission Slide 8 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 SP 2 Do you agree with the following BCC interleaver and LDPC DTM parameters for DCM NSD BCC NCOL BCC NROT LDPC DTM No DCM No DCM No DCM No DCM DCM DCM DCM DCM RU78 12 3 72 36 18 18 - 4 RU132 126 63 21 21 31 - 6 3 RU726 702 351 - - - - 18 9 Y/N/ABS Submission Slide 9 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 SP 3 Do you support the following DCM scheme for RU/M- RU size > 80 MHz Use segment parser to distribute coded bits to each 80MHz segment Within each 80MHz, perform DCM mapping using per 80MHz Nsd_k, k is the index of 80MHz segment Y/N/ABS Submission Slide 10 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 SP 4 Do you support one padding bit is added after 2 x NDBPS coded bit when BCC is used for RU132 with DCM? Y/N/ABS Submission Slide 11 Bin Tian (Qualcomm)
July, 2020 doc.: IEEE 802.11-20/1119r0 References [1] 11-20-0986r0 Jianhan et al. DCM for range extension in 6GHz LPI [2] 11-20-0405r1 Eunsung Park et al LDPC Tone Mapper for Multiple RU Aggregation Submission Slide 12 Bin Tian (Qualcomm)
