Dynamic Decision Mechanism for NPVA Switch-Back in OBSS
Explore a proposed dynamic decision mechanism addressing the challenges faced in NPVA channel switching-back scenarios during OBSS TXOP changes in IEEE 802.11 networks. The mechanism involves utilizing AP MLD with multi-link detection to optimize switch-back timing, thereby reducing invalid TXOPs effectively and synchronizing the process across different nodes.
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July 2025 doc.: IEEE 802.11-25/1152r0 Dynamic Decision Mechanism for NPCA Switch-Back in OBSS TXOP Early Termination Date: 2025-07-16 Authors: Name Affiliations Address Phone email Ruijie Networks Co., Ltd chehui@ruijie.com.cn Hui Che Ruijie Networks Co., Ltd Fachang Guo Ruijie Networks Co., Ltd LongLong Hong Ruijie Networks Co., Ltd Hang Yang Ruijie Networks Co., Ltd Yuqing Zheng Submission Slide 1 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 Abstract Background: NPCA mechanisms (802.11bn) define switch conditions to NPCA channel but lack robust solutions for switch-back during dynamic OBSS TXOP changes. Problem: Existing methods (MAP coordination) fail when: OBSS TXOP ends early, causing inaccurate switch-back timing; AP/STA face different OBSS interference sources. Proposal: AP MLD uses multi-link to dynamically decide switch-back timing, reducing invalid TXOPs. Submission Slide 2 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 NPCA Background & Gaps Current NPCA Framework (802.11bn): Switch to NPCA: Triggered by OBSS interference (bandwidth, duration, TA info). Switch-Back Rules: Motion #124: Defines NPCA switch/swich-back delays (0 252 s, 4 s resolution). Motion #126: Resets CW_NPCA[AC] and BO_NPCA when switching to NPCA channel. Identified Gaps: OBSS TXOP Early Termination: AP/STA on NPCA channel miss PCH OBSS TXOP end non-NPCA nodes initiate invalid TXOPs. Diverse OBSS Interference: AP and STA may switch due to different OBSS sources existing coordination method fails. Submission Slide 3 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 Proposed Dynamic Decision Mechanism Core Idea: AP MLD uses multi-link to detect OBSS TXOP early termination and optimize switch-back timing. Key Components: Detection: Non-NPCA nodes (e.g., non-AP MLD on PCH) monitor OBSS TXOP status. Notification: OBSS early termination event + BSS Color sent via idle link (e.g., Link 2). Decision: AP MLD verifies BSS Color match triggers switch-back command to NPCA nodes. Submission Slide 4 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 Example Scenario AP MLD3 AP MLD1 AP MLD2 OBSS interference OBSS interference OBSS interference ML OBSS interference ML non-AP MLD2 non-AP MLD1 Network Setup: AP MLD1 (Links: L1, L2), non-AP MLD1 (L1, L2), non-AP MLD2 (L1, L2). AP MLD2, AP MLD3. OBSS interference (from AP MLD2) on PCH triggers non-AP MLD1-L1 to switch to NPCA. OBSS interference (from AP MLD3) on PCH triggers AP MLD1-L1 to switch to NPCA. Non-AP MLD2-L1 remains on the PCH and does not switch to the NPCA channel. Mechanism Workflow: OBSS TXOP (from AP MLD2) ends early non-AP MLD2-L1 detects it on PCH. non-AP MLD2 sends the OBSS TXOP Early Termination notification (including BSS Color) to AP MLD1 via L2. AP MLD1 matches BSS Color commands non-AP MLD1-L1 to switch back via NPCA channel. Outcome: Prevents invalid TXOPs by synchronizing switch-back. Submission Slide 5 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 Benefits & Implementation Notes Advantages: Efficiency: Reduces invalid TXOPs. Scalability: Works without AP cooperation. Robustness: Handles diverse OBSS scenarios. Implementation Considerations: BSS Color Matching: Ensures only relevant OBSS events trigger actions. Notification Channel: Use reserved/link 2 to avoid congestion. Fallback: If no non-NPCA node exists, revert to traditional methods. Submission Slide 6 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 Summary Problem Addressed: Dynamic OBSS TXOP changes and heterogeneous interference break existing NPCA switch-back mechanisms. Solution: Multi-link notification + BSS Color verification dynamic switch-back decisions. Impact: Improves channel utilization, reduces collisions, and extends NPCA applicability to non-cooperative OBSS environments. Submission Slide 7 Hui Che, Ruijie Networks Co., Ltd
July 2025 doc.: IEEE 802.11-25/1152r0 References [1]11-24-1852-00-00bn, some-details-on-npca-operation , Ofinno, 2025. Submission Slide 8 Hui Che, Ruijie Networks Co., Ltd
