IEEE 802.11-20/0109: Multi-RU Considerations for 11be Standard
Explore the considerations for implementing multiple RUs for a single STA in the IEEE 802.11be standard. Topics include signaling, bit processing, MCS selection, and potential combinations with MU-MIMO technology. Discover how current RU addressing limitations can be overcome and the proposed approaches for efficient multi-RU signaling and bit processing in transmissions.
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January 2020 doc.: IEEE 802.11-20/0109 Further considerations for multi-RU Date: 2020-01-10 Authors: Name Sigurd Schelstraete Affiliations Address Phone email Sigurd.Schelstraete@onsemi.com Huizhao.Wang@onsemi.com Huizhao Wang 1704 Automation Pkwy San Jose, CA 95131 USA Quantenna/ON Semiconductor Debashis.Dash@onsemi.com Debashis Dash Abhishek.Agrawal@onsemi.com Abhishek Agrawal Submission Slide 1 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Introduction It has been agreed in principle to support multiple RUs for a single STA in 11be RU sizes and combinations were discussed in [4] In this submission we additionally consider: Signaling for multi-RU Bit processing and frequency domain processing MCS selection Combination with MU-MIMO Submission Slide 2 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Multi-RU signaling Current RU addressing in an HE MU PPDU does not allow allocating more than one RU to a single STA (see D6.0, clause 26.5.1.2) Equivalently, all (occupied) user specific fields in HE- SIG-B have a unique STA-ID However in spite of the usage restriction, nothing in the actual format of TXVECTOR or HE-SIG-B precludes using the same STA-ID for multiple RUs E.g. have two user specific fields with the same STA-ID field Submission Slide 3 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Multi-RU signaling (2) The easiest way is to signal multi-RU appears to be to reuse 11ax TXVECTOR/HE-SIG-B format without the usage restriction No explicit signaling is needed beyond that A receiving STA can recover the needed information from parsing HE-SIG-B and collecting all fields matching its STA-ID NOTE: Receiver can no longer stop processing at the first User Specific field that has a matching STA-ID Not a very onerous requirement STAs not included in an MU transmission already process all user specific fields NOTE: new signaling may still be needed for use of multi- RU in UL OFDMA Submission Slide 4 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Bit processing for multi-RU transmission In general, we can observe that bit processing (coding/Padding/scrambling, ) is done per user Stream Parsing/interleaving/constellation mapping/tone mapping/pilot insertion for each user is done per RU As also proposed elsewhere, we suggest to stay with this approach for the case of multi-RU transmissions Single encoder per user Coded bits per symbol divided over RUs and processed per RU Submission Slide 5 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Bit Processing & Freq domain processing Submission Slide 6 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 MCS and N_STS for multi-RU All RUs for a given STA go through essentially the same channel (same transmitter, same receiver), similar to SU transmission If single bit stream is mapped to multi-RU, no separate link adaptation information is available per RU If there is a single encoder for the bit stream, different MCS per RU would still have to use the same code rate, imposing a quite impractical constraint on link adaptation The most practical approach appears to be to assume the same MCS and N_STS for all RUs sent to a given STA in a multi-RU transmission Submission Slide 7 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Multi-RU in combination with MU-MIMO 802.11ax optionally allows MU-MIMO within an RU When multi-RU is used as implementation of preamble puncturing, MU-MIMO support would be reasonable Do we need to support combination of OFDMA, MU- MIMO and multi-RU support? We propose to only support combined multi-RU and MU-MIMO for the non-OFDMA case i.e. all RUs allocated to same user Submission Slide 8 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Straw Poll Do you agree that multi-RU signaling shall reuse the HE- SIG-B protocol, modified such that multiple User Specific fields are allowed to have the same STA-ID (other than 2046)? Y/N/A: Submission Slide 9 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Straw Poll Do you agree that multi-RU bit processing shall be per user (specifically, one encoder/decoder per user)? Y/N/A: Submission Slide 10 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Straw Poll Do you agree that all RUs in an OFDMA transmission that are addressed to the same STA-ID shall use the same MCS and N_STS? Y/N/A: Submission Slide 11 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 Straw Poll Do you agree that MU-MIMO shall only be used in combination with multi RU if all RUs are addressed to the same (MU) group of STAs? Y/N/A: Submission Slide 12 Sigurd Schelstraete, Quantenna/ON
January 2020 doc.: IEEE 802.11-20/0109 References [1] Preamble puncturing and RU aggregation, IEEE 802.11-19/1869r0 [2] Multiple RU Combinations for EHT, IEEE 802.11- 19/1907r0 [3] Multi-RU Support, IEEE 802.11-19/1908r0 [4] Multi-RU support for OFDMA, IEEE 802.11- 20/0108r0 Submission Slide 13 Sigurd Schelstraete, Quantenna/ON
