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EMLSR Dynamic Subband Operation Proposal

This contribution discusses a proposal for dynamic subband operation within the EMLSR mode of IEEE 802.11 standards. The proposal enables a 320MHz AP to dynamically indicate transmission opportunities to a 160MHz non-AP, enhancing resource utilization and system performance. It introduces the concept of Dynamic Subband Operation (DSO) to facilitate flexible allocation of bandwidth based on channel conditions and QoS requirements.

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EMLSR Dynamic Subband Operation Proposal

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  1. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation Date: 2023-09-14 Authors: Name Yongho Seok Affiliations MediaTek Address Phone email yongho.seok@mediatek.com James Yee Kaiying Lu Yonggang Fang Li-Hsiang Sun Frank Hsu Gabor Bajko Submission Slide 1 Yongho Seok, MediaTek

  2. September 2023 doc.: IEEE 802.11-23/1496r0 Abstract This contribution discusses the dynamic subband operation on the EMLSR mode. Submission Slide 2 Yongho Seok, MediaTek

  3. September 2023 doc.: IEEE 802.11-23/1496r0 Recap: Dynamic Subband Operation UHR can define a new method Dynamic Subband Operation allowing the 320MHz AP to dynamically indicate to a 160MHz non-AP, Tx/Rx opportunity on the secondary 160MHz. ● While this presentation uses a 320MHz AP and a 160MHz non-AP as an illustration, the proposal is extensible to any AP/non- AP bandwidth combinations where the bandwidth supported by the AP is higher than the non-AP. ● The operation could be DL or trigger-based UL inside each dynamically allocated opportunity ● Dynamic Subband Operation can enable the AP to utilize its secondary 160MHz bandwidth in a dynamic manner on a per- TXOP basis whenever it wins channel access on it. ● The AP can dynamically decide whether to allocate non-APs on the primary 160MHz or secondary 160MHz and which non-APs to allocate in this manner depending on bandwidth availability, channel conditions and QoS requirements ○ This helps align the presence of the narrower bandwidth non-APs on the secondary 160MHz channel with the availability of secondary 160MHz bandwidth ○ This results in better resource utilization and system performance compared to HE SST. ○ Submission Slide 3 Yongho Seok, MediaTek

  4. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • In this contribution, we propose the EMLSR based dynamic subband operation (DSO). Submission Slide 4 Yongho Seok, MediaTek

  5. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • In the EMLSR mode, an AP MLD begins the EMLSR sequence by exchanging the initial Control frame and response with a non-AP MLD. • The DSO sequence can be independent of the EMLSR sequence. • The DSO sequence can be integrated with the EMLSR sequence. • In the context of protocol signaling, the integrated design is preferred. Submission Slide 5 Yongho Seok, MediaTek

  6. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • An AP MLD that initiates frame exchanges with a non-AP MLD can request to the non-AP MLD to switch to the DSO operating channel by setting the RU Allocation field in the initial Control frame (i.e., MU-RTS and BSRP Trigger frames) to the DSO operating channel. • After receiving the initial Control frame, • The non-AP MLD switches to the DSO operating channel and sends the response (i.e., CTS and BSR) frame. • The non-AP MLD stays at the switched DSO operating channel until the end of the TXOP. • During the TXOP, the AP MLD schedules the RU to the non-AP MLD based on the DSO operating channel. Submission Slide 6 Yongho Seok, MediaTek

  7. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 160 MHz operation STA in 320 MHz BSS • Initial Control frame (e.g., BSRP Trigger) does not trigger the DSO. BSRP Trigger (Rx) Padding … S160 BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding Data (Rx) BSR (Tx) ACK (Tx) … P160 Idle Listening Idle Listening Operating Channel(Rx/Tx) Padding BSRP Trigger (Rx) RU Allocation = RU within P160 Submission Slide 7 Yongho Seok, MediaTek

  8. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 160 MHz operation STA in 320 MHz BSS • Initial Control frame (e.g., BSRP Trigger) triggers the DSO. BSR (Tx) Data (Rx) ACK (Tx) Padding BSRP Trigger (Rx) … S160 Operating Channel(Rx/Tx) BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding … P160 Idle Listening Idle Listening Padding BSRP Trigger (Rx) RU Allocation = RU within S160 Submission Slide 8 Yongho Seok, MediaTek

  9. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 80 MHz operation STA in 160 MHz BSS • Initial Control frame (e.g., BSRP Trigger) does not trigger the DSO. BSRP Trigger (Rx) Padding … S80 BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding Data (Rx) BSR (Tx) ACK (Tx) … P80 Idle Listening Idle Listening Operating Channel(Rx/Tx) Padding BSRP Trigger (Rx) RU Allocation = RU within P80 Submission Slide 9 Yongho Seok, MediaTek

  10. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 80 MHz operation STA in 160 MHz BSS • Initial Control frame (e.g., BSRP Trigger) triggers the DSO. BSR (Tx) Data (Rx) ACK (Tx) Padding BSRP Trigger (Rx) … S80 Operating Channel(Rx/Tx) BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding … P80 Idle Listening Idle Listening Padding BSRP Trigger (Rx) RU Allocation = RU within S80 Submission Slide 10 Yongho Seok, MediaTek

  11. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 80 MHz operation STA in 320 MHz BSS • Option 1) DSO of 80 MHz operation STA is allowed on secondary 80 MHz only. BSRP Trigger (Rx) Padding … S160 BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding Data (Rx) BSR (Tx) ACK (Tx) Operating Channel(Rx/Tx) … P160 Idle Listening Idle Listening Padding BSRP Trigger (Rx) RU Allocation = RU within S80 Submission Slide 11 Yongho Seok, MediaTek

  12. September 2023 doc.: IEEE 802.11-23/1496r0 EMLSR Dynamic Subband Operation • 80 MHz operation STA in 320 MHz BSS • Option 2) DSO of 80 MHz operation STA is allowed on secondary 80 MHz and 160 MHz. • AP and STA need to negotiate the location of the DSO operating channel among three 80 MHz channels. BSRP Trigger (Rx) Padding … S160 Data (Rx) BSR (Tx) ACK (Tx) BSRP Trigger (Rx) BSRP Trigger (Rx) Padding Padding Operating Channel(Rx/Tx) … P160 Idle Listening Idle Listening Padding BSRP Trigger (Rx) RU Allocation = RU within S80 Submission Slide 12 Yongho Seok, MediaTek

  13. September 2023 doc.: IEEE 802.11-23/1496r0 Conclusion • The DSO can improve the channel utilization of the wideband BSS (e.g., 320MHz). • In this contribution, we propose to use the DSO on the EMLSR. • In the following contribution, we will discuss to apply the DSO in other features (like non-primary channel access). Submission Slide 13 Yongho Seok, MediaTek

  14. September 2023 doc.: IEEE 802.11-23/1496r0 References • https://mentor.ieee.org/802.11/dcn/22/11-22-2204-00-0uhr-dynamic- subband-operation.pptx • https://mentor.ieee.org/802.11/dcn/20/11-20-0736-00-00be-eht-sst- operation.pptx Submission Slide 14 Yongho Seok, MediaTek

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