Bitmap Indication for OFDMA Transmission
Dec. 2020 introduces a preamble puncture bitmap indication for 20/40 MHz OFDMA transmission, proposing to use '1111' when no puncturing is applied. The straw poll suggests adding this indication to the TGbe SFD. The submission highlights the specific bit values for punctured 20 MHz channels within an 80 MHz segment.
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Dec 2020 Preamble Puncture Bitmap Indication for 20 and 40 MHz OFDMA Transmission Date: 2020-12-22 11-20/1984r1 Authors: Affiliations Address Phone email Name Ross Jian Yu ross.yujian@huawei.com Huawei Mengshi Hu Huawei Ming Gan Huawei Wei Jiang Huawei Submission Slide 1 Ross Jian Yu, et al Huawei Technologies
Dec 2020 11-20/1984r1 Background In SFD [1], the following motion has passed regarding preamble puncture indication in U-SIG regarding OFDMA transmission: The punctured channel information in U-SIG for the DL OFDMA case is a 4-bit bitmap that tells which 20 MHz channel is punctured in the relevant 80 MHz. Information may vary from one 80 MHz to another. The information is located in the 4 LSBs of the overall 5-bit punctured channel indication field. MSB is reserved. The LSB to the 4th bit of the field apply from the lowest frequency 20 MHz channel to the highest frequency 20 MHz channel. [Motion 137, #SP290, [3] and [92]] In P802.11be D0.2 [2], page 206 If B0 B1 of U-SIG-2 is set to 0, which is the OFDMA case,B3 B6 is a 4-bit bitmap that tells which 20 MHz channel is punctured in the relevant 80 MHz segment, where B3 applies to the lowest frequency 20 MHz channel and B6 to the highest frequency 20 MHz channel. For each of the bits B3 B6, a value of 0 indicates that the corresponding 20 MHz channel is punctured, and a value of 1 is used otherwise. Field value may vary from one 80 MHz to the other. B7 is Disregard and set to 1. Submission Slide 2 Ross Jian Yu, et al Huawei Technologies
Dec 2020 Bitmap indication for 20/40 MHz OFDMA transmission 11-20/1984r1 The bitmap indication for an 20/40 MHz OFDMA transmission is missing where preamble puncture shall not be applied. Propose to simply indicate 1111 for an 20/40 MHz OFDMA transmission. Submission Slide 3 Ross Jian Yu, et al Huawei Technologies
Dec 2020 11-20/1984r1 Straw Poll #1 Do you agree to add the following text in the TGbe SFD: The puncture bitmap indication for an 20/40 MHz OFDMA transmission is 1111. All the other values of the puncture bitmap indication shall be Validate. Submission Slide 4 Ross Jian Yu, et al Huawei Technologies
Dec 2020 11-20/1984r1 References 1. 11-20-1935-03-00be-compendium-of-straw-polls-and-potential-changes-to- the-specification-framework-document-part-2, Edward Au (Huawei) 2. P802.11be D0.2 Submission Slide 5 Ross Jian Yu, et al Huawei Technologies
