Discussion on EHT PPDU Formats
Delve into the specifics of EHT PPDU formats as outlined in the January 2020 IEEE document. Explore the classification of EHT PPDU into basic and trigger-based formats, discussing the presence of EHT-SIG, U-SIG structures, and variations based on the type of transmission. Gain insights into the components, structure, and significance of EHT PPDU in the context of IEEE 802.11 standards for wireless communication.
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Presentation Transcript
January 2020 doc.: IEEE 802.11-20/0031r0 Discussion on EHT PPDU Formats Date: 2020-01-12 Authors: Name Company Address Phone Email Lei Huang lei.huang@sg.panasonic.com Panasonic Corporation Yanyi Ding Urabe Yoshio Rojan Chitrakar Submission Slide 1 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 Background According to 11be SFD [2], an EHT PPDU comprises legacy preamble, RL-SIG and U-SIG. Furthermore, an EHT PPDU transmitted to multiple users comprises an EHT-SIG immediately after the U-SIG. RL-SIG U-SIG L-LTF L-SIG EHT-SIG L-STF However, it is unclear whether EHT-SIG is present in other types of EHT PPDU, e.g. an EHT PPDU transmitted to a single user; an EHT PPDU for trigger-based uplink transmission; or an EHT PPDU for trigger-based multi-AP joint transmission. This contribution addresses different EHT PPDU formats. Submission Slide 2 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 Presence of EHT-SIG in EHT PPDU U-SIG in 11be SFD [2] 2 OFDM symbol long and jointly encoded sent using 52 data tones and 4 pilot tones per-20MHz. modulated in the same way as the HE-SIG-A field of 802.11ax. EHT PPDU transmitted to a single user U-SIG may not have enough data bits to accommodate all version dependent information which comprises similar information to HE-SIG-A of HE SU PPDU with extended support for up to 320 MHz bandwidth and 16 space-time streams; and preamble puncturing information. EHT-SIG may be required for EHT PPDU transmitted to a single user to contain some version dependent information. EHT-SIG of an EHT PPDU transmitted to single STA may have a different format from that of an EHT PPDU transmitted to multiple STAs. EHT PPDU for trigger-based uplink transmission or multi-AP joint transmission most of version dependent information can be included in the soliciting triggering frame. EHT-SIG may not be present in EHT PPDU for trigger-based transmission. Submission Slide 3 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 EHT PPDU Formats We propose EHT PPDUs can be broadly classified into two formats: EHT basic PPDU which is used for non-trigger-based transmission EHT-SIG is present in EHT basic PPDU EHT TB PPDU which is used for trigger-based transmission EHT-SIG is not present in EHT TB PPDU RL-SIG U-SIG L-LTF L-SIG EHT-SIG L-STF EHT Basic PPDU RL-SIG U-SIG L-LTF L-SIG L-STF EHT TB PPDU Submission Slide 4 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 U-SIG in EHT Basic PPDU U-SIG has a unified format regardless of whether EHT basic PPDU is transmitted to a single STA or multiple STAs. U-SIG comprises two parts: U-SIG1 and U-SIG2, each containing 26 data bits. U-SIG include all version independent bits and some version dependent bits (e.g. PPDU Format, SU/MU Flag, BW, EHT-SIG related info, and Spatial Reuse). Example U-SIG content Field names Field size (bits) 3 1 6 7 4 1 1 3 1 3 1 4 4 3 4 6 52 PPDU format 0: EHT Basic PPDU 1: EHT TB PPDU SU/MU 0: EHT Basic PPDU transmitted to a single user; 1: EHT Basic PPDU transmitted to multiple users. BW field 0: 20 MHz. 1: 40 MHz. 2: 80 MHz non-preamble puncturing mode. 3: 160 MHz and 80+80 MHz non-preamble puncturing mode. 4: 320 MHz and 160+160 MHz non-preamble puncturing mode. 5: 80 MHz preamble puncturing mode. 6: 160 MHz and 80+80 MHz preamble puncturing mode. 7: 320 MHz and 160+160 MHz preamble puncturing mode. PHY Version Identifier UL/DL Flag BSS Color TXOP Duration Reserved PPDU Format SU/MU Flag U-SIG1 BW EHT-SIG Compression EHT-SIG EHT MCS EHT-SIG DCM Number Of EHT-SIG Symbols Or MU-MIMO Users Spatial Reuse Reserved CRC U-SIG2 Tail Total Submission Slide 5 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 U-SIG in EHT TB PPDU U-SIG include all version independent bits and all necessary version dependent bits (e.g. PPDU Format, BW and Spatial Reuse). Example U-SIG content Field names PHY Version Identifier UL/DL Flag BSS Color TXOP Duration Reserved PPDU Format Reserved BW Spatial Reuse 1 Spatial Reuse 2 Spatial Reuse 3 Spatial Reuse 4 CRC Tail Total Field size (bits) 3 1 6 7 4 1 1 3 4 4 4 4 4 6 52 U-SIG1 U-SIG2 Submission Slide 6 Lei Huang (Panasonic)
January 2020 EHT-SIG in EHT Basic PPDU Transmitted to a Single User doc.: IEEE 802.11-20/0031r0 EHT-SIG contains remaining version dependent bits. There is a single EHT-SIG content channel regardless of the BW of EHT basic PPDU. User-specific field comprises a single user field, which is jointly encoded with common field User field has a similar format to the type 1 user field proposed in [2]. Example common field content Common field Subfield names LDPC Extra Symbol Segment Pre-FEC Padding Factor PE Disambiguity STBC Doppler GI-LTF Size EHT-LTF Mode Beam Change Preamble Puncturing Bitmap Total Field size (bits) BW = 0 to 4 1 2 1 1 1 2 1 1 0 10 BW = 5 1 2 1 1 1 2 1 1 3 13 BW = 6 1 2 1 1 1 2 1 1 7 17 BW = 7 1 2 1 1 1 2 1 1 15 25 Note: For Preamble Puncturing Bitmap subfield, each bit indicates whether or not a 20 MHz frequency segment which is not primary 20 is punctured. Submission Slide 7 Lei Huang (Panasonic)
January 2020 EHT-SIG in EHT Basic PPDU Transmitted to Multiple Users doc.: IEEE 802.11-20/0031r0 There is one or more EHT-SIG content channels depending on the BW of EHT basic PPDU. Common field comprises 1st common subfield and 2nd common subfield, which are separately encoded. The 1st common subfield is the same for all EHT-SIG content channels; while the 2nd common subfield differs among the EHT-SIG content channels. The 2nd common subfield has similar format to the common field in 11ax, which is not present in case of full BW MU-MIMO mode. The user-specific field has similar structure to 11ax. The formats of user fields have been addressed in [2]. Example 1st common field content 1st common field LDPC Extra Symbol Segment Pre-FEC Padding Factor PE Disambiguity Doppler GI-LTF Size EHT-LTF mode Number of EHT-LTF Symbols And Midamble Periodicity Total Field size (bits) 1 2 1 1 2 1 4 12 Submission Slide 8 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 Summary Two EHT PPDU formats (i.e. EHT basic PPDU and EHT TB PPDU) are proposed. EHT-SIG is present in EHT basic PPDU but not present in EHT TB PPDU. EHT-SIG contains version dependent bits which cannot be accommodated in U-SIG. Submission Slide 9 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 Reference 1) 2) IEEE 802.11-19/1262r6, Specification Framework for TGbe, November 2019 IEEE 802.11-19/1868r2, Signaling support for multi-RU assignment, January 2020 Submission Slide 10 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 SP #1 Do you agree that EHT-SIG is present immediately after U-SIG in an EHT PPDU transmitted to a single user? Submission Slide 11 Lei Huang (Panasonic)
January 2020 doc.: IEEE 802.11-20/0031r0 SP #2 Do you agree that EHT-SIG is not present in an EHT PPDU used for trigger-based uplink transmission or multi-AP joint transmission? Submission Slide 12 Lei Huang (Panasonic)
