Enhancing Throughput with Aggregated PPDU for Large Bandwidth IEEE 802.11 Networks
This document discusses the implementation of Aggregated PPDU to boost throughput in IEEE 802.11 networks with large bandwidth. The focus is on accommodating various STAs with different operating bandwidths and optimizing traffic flow. By utilizing Aggregated PPDU, significant gains in throughput can be achieved for both downlink and uplink transmissions, providing a flexible scheduler for mixed-generation STAs. The seamless integration of Aggregated PPDU ensures compatibility with both EHT and HE receivers.
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May 2020 doc.: IEEE 802.11-20/0693r1 Aggregated PPDU for Large BW Date: 2020-05-02 Authors: Name Affiliations Address Phone email NXP Rui Cao 350 Holger Way, San Jose, CA 95134 rui.cao_2@nxp.com Hongyuan Zhang hongyuan.zhang@nxp.com Sudhir Srinivasa sudhir.srinivasa@nxp.com Submission Slide 1 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 Introduction EHT allows up to 320MHz BSS operation. Many EHT client STAs will operate in 20/80/160MHz. Many HE STAs with operating BW of 20/80/160MHz will exist at the time of EHT APs coming to market. How to get the most Tput out of large BW BSS? SST Mechanism for STAs parking on secondary channels Aggregated PPDU Submission Slide 2 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 Aggregated PPDU (A-PPDU) Aggregated PPDU Sub-PPDU-3 80MHz Sub-PPDU-2 80MHz 160MHz Sub-PPDU-1 Aggregated PPDU consists of multiple sub-PPDUs. Each sub-PPDU occupies non-overlapping frequency segments. The sub-PPDUs are orthogonal in frequency domain symbol-by-symbol. Each sub-PPDU can have the same or different PPDU format. Similar to Coordinated OFDMA format using small-BW PPDU. Both downlink and uplink are applicable. Submission Slide 3 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 Sub-PPDU Format Sub-PPDU can be EHT or HE PPDU. EHT-HE aggregation Most useful case Achieve good throughput gain with traffic from mixed STAs. Better support of secondary channel parking of EHT STAs. EHT-EHT aggregation Similarly to EHT OFDMA, with limitation of resource allocation. May save some EHT-SIG overhead. HE-HE aggregation Achieves double/quadruple throughput with similar overhead. May not work well in punctured channels. HE 80MHz operating STA parking on secondary 80MHz does NOT have good support for punctured channels. Submission Slide 4 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 Enabler for A-PPDU Mechanism for STAs parked on secondary channels, e.g. SST protocol enhancement. PHY signaling for Puncture Information for each segment. Preamble alignment across sub-PPDUs. EHT and HE are well aligned up to U-SIG/HE-SIGA. Alignment of EHT-SIG and HE-SIGB. Padding scheme to allow the same number symbols. HE-SIGB allows SU/MUMIMO transmission in uncompressed mode. EHT-SIG should also consider allowing SU/MUMIMO transmission in uncompressed mode. Same format of EHT-LTF and/or HE-LTF, or same as Data. Data portion alignment The same tone spacing across sub-PPDUs: EHT and HE The same GI setting. Submission Slide 5 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 Summary A-PPDU is beneficial for BSS with large BW. When most client STAs having operating BW <= 160MHz. Boost BSS throughput for both DL/UL. Flexible scheduler for traffic from mixed generation of STAs. With small design consideration in EHT preamble, A- PPDU can be easily supported. A-PPDU is almost transparent to both EHT and HE receiver. Submission Slide 6 Rui Cao and etc., NXP
May 2020 doc.: IEEE 802.11-20/0693r1 SP Do you agree to define aggregated PPDU for EHT? Aggregated PPDU consists of multiple sub-PPDUs. The sub-PPDU format combination limits to EHT and HE. Other combinations are TBD. For the sub-PPDU using HE format, the PPDU BW TBD. The number of sub-PPDUs is TBD. A-PPDU will be R2 feature. Y N A Submission Slide 7 Rui Cao and etc., NXP
