IEEE 802.11-25/401r0 CoBF PHY Design Considerations
Explore the design considerations for IEEE 802.11-25/401r0 focusing on triggering MU CoBF PPDU transmission and syncing frames. Learn about U-SIG and UHR-SIG formats for CoBF PPDU, key parameters, and field summaries essential for efficient data transmission.
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Jan 2025 doc.: IEEE 802.11-25/401r0 CoBF PHY design consideration Date: 2025-3-11 Authors: Name Juan Fang Qinghua li Shlomi Vituri Laurent Cariou Dibakar Das Danny Alexander Dmitry Akhmetov Danny Ben-Ari Po-kai Huang Affiliations Intel Address 2111 NE 25th Ave, Hillsboro OR 97124, USA Phone email Juan.fang@intel.com Submission Slide 1 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 Introduction 802.11bn has defined the pre-UHR portion [1] of the MU PPDU with CoBF enabled as non-beamformed mode. Both two APs need to send the MU CoBF PPDU with same content in L-SIG, RL-SIG, U-SIG and UHR-SIG. This contribution focuses on which information should be carried in the CoBF sync/trigger frame to trigger the MU CoBF PPDU transmission. Submission Slide 2 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 Example Sequence for MU CoBF PPDU transmission Shared TXOP Sharing AP CoBF Sync DL PPDU Information collection & parameter calculation/definition & trigger frame preparing Invite Information sharing (AP1-STA1 pairs, SS, L-length, BW) Mapping from Trigger frame to L-SIG, U-SIG and UHR-SIG Sync. Data preparing CoBF Confirm Information sharing (AP2-STA2 per User Info.) Shared AP DL PPDU This contribution focuses on which information should be carried in the CoBF Sync frame and map them easily to the preamble of DL MU CoBF PPDU The detail control frame exchange sequence is under discussion Submission Slide 3 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 U-SIG and UHR-SIG format for MU CoBF PPDU U-SIG format for MU CoBF PPDU: U- SIG1 B0-B2 B3-B5 B6 B7-B12 B13-B19 B20-B25 PHY version (set to 1) PPDU BW UL/DL BSS color 1 TXOP BSS color 2 U- SIG2 B0-B1 B2 B3-B7 B8 B9-B10 B11-B15 B16-B19 B20-B25 PPDU Type CoBF/CoS R Punctured Channel Information Validate UHR-SIG MCS Number of UHR-SIG Symbols CRC Tail UHR-SIG format for MU CoBF PPDU: Common field for non-OFDMA transmission B0-B3 B4-B5 B6-B8 B9 B10-B11 B12 B13 B14-B15 B16-B18 Spatial Reuse GI+LTF Size Number of UHR-LTF Symbols LDPC Extra Symbol Segment Pre-FEC padding Factor PE Disambiguity IM Disregard Number of non- OFDMA Users User field format for an MU-MIMO allocation B0-B10 B11-B15 B16-B19 B20 B21 B22 STA-ID MCS Spatial Configuration Res BSS color differentiation 2x LDPC Submission Slide 4 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 Summary of all the fields must or recommended to be carried in CoBF sync frame Field in L-SIG, U-SIG of MU CoBF PPDU Field must/recommended to be carried in CoBF Sync for CoBF data PPDU L-SIG Length Must to indicate PPDU length PHY Version Identifier Set to 1 Bandwidth Must to indicate PPDU BW UL/DL Set to DL BSS Color Recommended to carry for easy copy/paste at shared AP TXOP Recommended to carry for NAV setting U-SIG BSS Color 2 Recommended to carry for easy copy/paste at shared AP PPDU Type And Compression Mode Set to non-OFDMA DL MU MIMO CoBF/CoSR Indication Set to 0 Punctured Channel Information Must to indicate the static puncturing channel information UHR-SIG MCS Fix to 0 Number of UHR-SIG Symbols Must to indicate the number of UHR-SIG symbols of the Mu CoBF PPDU Submission Slide 5 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 Summary of all the fields must or recommended to be carried in CoBF sync frame (cont.) Field in UHR-SIG of MU CoBF PPDU Field must/recommended to be carried in CoBF Sync for CoBF data PPDU Spatial Reuse PSR_AND_NON_SRG_OBSS_PD_PROHIBITED GI+LTF Size Must Number Of UHR-LTF Symbols Must UHR-SIG Common Fix to 1 LDPC Extra Symbol Segment Fix to 4 Pre-FEC Padding Factor Fix to 1 with TPE for MU CoBF PPDU to be 20 s Disabled Recommended to carry for easy copy/paste at shared AP Must Must Must Recommended to carry for easy copy/paste at shared AP 2x LDPC PE Disambiguity IM Number of Non-OFDMA Users STA ID (for users in both sharing/shared BSS) MCS Spatial Configuration BSS Color Indication 2xLDPC UHR-SIG User Field Submission Slide 6 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 Summary Summarized all the fields must or recommended to be carried in the CoBF sync/trigger frame for the shard AP to prepare the L-SIG, U-SIG and UHR-SIG in MU CoBF PPDU transmission Proposals to simplifythe information sharing between APs for MU COBF transmission Fix the TPE to be 20 s. Fix Pre-FEC padding Factor to be 4. Fix LDPC Extra Symbol Segment to be 1. Fix UHR-SIG MCS to 0. Disable SR and IM. Submission Slide 7 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 References [1] https://mentor.ieee.org/802.11/dcn/24/11-24-1822-04-00bn-cobf-design-for- uhr.pptx Submission Slide 8 Juan Fang, Intel
Jan 2025 doc.: IEEE 802.11-25/401r0 SP1 Do you agree to include the following into the 11bn SFD? The TPE for UHR MU PPDU with CoBF enabled is fixed to be 20 s? Submission Slide 9 Juan Fang, Intel
