Improving Wi-Fi Performance with Coordinated OFDMA in IEEE 802.11
Enhance Wi-Fi performance through Coordinated OFDMA in IEEE 802.11, a simpler scheme within Multi-AP Coordination. Learn how it reduces latency, benefits specific STAs, and optimizes frequency resource coordination for effective results.
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January 2020 doc.: IEEE 802.11-20/0056r0 Preparations for Coordinated OFDMA Date: 2020-01-10 Authors: Name Rojan Chitrakar Company Address Phone Email 202 Bedok South Avenue 1, #02-11 Singapore 469332 rojan.chitrakar@sg.panasonic.com Panasonic Corporation Lei Huang Yanyi Ding Yoshio Urabe Submission Slide 1 Rojan Chitrakar (Panasonic)
January 2020 doc.: IEEE 802.11-20/0056r0 Overview Coordinated OFDMA may be considered as a simpler scheme among the various Multi-AP Coordination schemes being considered in 11be. Coordinated OFDMA may substantially improve worst case latency (3.5x reduction in maximum access time compared to EDCA). [4] To achieve effective results, prior coordination of the frequency resources among the participating APs may be helpful. Submission Slide 2 Rojan Chitrakar (Panasonic)
January 2020 Candidate STAs for Coordinated OFDMA doc.: IEEE 802.11-20/0056r0 Not all STAs benefit equally from Coordinated OFDMA. Some may benefit more than others. [1] BSS2 STA3 AP2 STA2 STA1 STA4 AP1 BSS1 STAs that may benefit the most from Coordinated OFDMA should be identified prior to the coordinated transmissions: for example STAs within the transmission range of multiple APs. For example an AP may collect reports (e.g. interference measurement reports) from associated STAs to identify the candidate STAs. Submission Slide 3 Rojan Chitrakar (Panasonic)
January 2020 doc.: IEEE 802.11-20/0056r0 Preferred frequency resources Each AP also identifies the frequency resources (within its operating bandwidth) that may be preferable for its candidate STAs. Alternatively, APs may identify the frequency resources that are not preferable for their candidate STAs (e.g. due to presence of high OBSS interference). APs participating in Coordinated OFDMA transmissions exchange the information of the preferred (or not-preferred) frequency resources prior to coordinated transmissions (e.g. during the coordinated OFDMA Setup phase [3]). Submission Slide 4 Rojan Chitrakar (Panasonic)
January 2020 Coordinated OFDMA Transmission doc.: IEEE 802.11-20/0056r0 During the Coordinated OFDMA transmissions, the Coordinating AP uses the information of the preferred frequency resources to allocate sub-channels to participating APs (e.g. during the Schedule Allocation phase [2], or in Coordinated OFDMA Announcement (COA) frame [3]). exchange of preferred frequency resources Identification of preferred frequency resources Coordinated OFDMA transmission TXOP 20 MHz 20 MHz AP2 20 MHz 20 MHz AP1 ... ... 20 MHz 20 MHz STA2 (Associated with AP2) 20 MHz 20 MHz STA1 t (Associated with AP1) SIFS SIFS SIFS Measurement report frame AP-to-AP frame Multi-AP Trigger frame Basic Trigger frame Ack frame UL PPDU Submission Slide 5 Rojan Chitrakar (Panasonic)
January 2020 doc.: IEEE 802.11-20/0056r0 Conclusion To achieve effective results, prior coordination of the frequency resources among the participating APs may be helpful. APs participating in Coordinated OFDMA transmissions may exchange the information of the preferred (or not-preferred) frequency resources prior to coordinated transmissions. During Coordinated OFDMA transmissions, the Coordinating AP can use the information of the preferred frequency resources to allocate sub-channels to participating APs. Submission Slide 6 Rojan Chitrakar (Panasonic)
January 2020 doc.: IEEE 802.11-20/0056r0 Reference 1) IEEE 802.11-19/0071r0 - Coordinated Multi-AP Transmission for EHT 2) IEEE 802.11-19/1582r0 - Coordinated AP Time/Frequency Sharing in a Transmit Opportunity in 11be 3) IEEE 802.11-19/1788r0 - Coordinated OFDMA Operation 4) IEEE 802.11-19/1879r0 - Gain Analysis of Coordinated AP Time/Frequency Sharing in a Transmit Opportunity in 11be 5) IEEE 802.11-19/1919r0 - Coordinated OFDMA Submission Slide 7 Rojan Chitrakar (Panasonic)
January 2020 doc.: IEEE 802.11-20/0056r0 Straw Poll 1 Do you support that APs participating in Coordinated OFDMA transmissions may exchange the information of preferred (or not-preferred) frequency resources prior to coordinated transmissions? Y/N/A Submission Slide 8 Rojan Chitrakar (Panasonic)
