IEEE 802.11-25/0540r0 Cross-Link Indication for NPCA Proposal
"Explore the proposal for resolving CID 1781 and 1782 in IEEE 802.11-25/0540r0, addressing issues related to switching between NPCA and BSS P-channels. The mechanisms aim to mitigate different view problems and medium sync loss problems, enhancing network efficiency and performance."
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March 2025 doc.: IEEE 802.11-25/0540r0 Cross Link Indication for NPCA Date: 2025-03-26 Authors: Name Affiliations Address Phone email Chaoming Luo OPPO luochaoming@oppo.com Liuming Lu OPPO Ning Gao OPPO Yapu Li OPPO Liangxiao Xin OPPO Submission Slide 1 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Abstract Proposes a mechanism to resolve CID 1781 and 1782. CID 1781 Clause Comment 37.10 To mitigate the different view problem, when an affiliated AP of link 1 switches to NPCA P-channel, the affiliated AP of link 2 which obtains an TXOP can inform the non-AP MLDs to switch to NPCA P-channel of link 1. 37.10 To mitigate the medium sync loss problem, when an affiliated AP of link 1 switches to BSS P-channel from NPCA P-channel, the affiliated AP of link 2 which obtains an TXOP can solicit the non-AP MLDs to report NAV of link 1. 1782 Submission Slide 2 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Proposal 1 When AP1 switches to NPCA P-channel, AP2 which holds an TXOP may notify the non-AP MLDs that have affiliated STAs on link 1 (e.g., STA1, STA3, STA5) to switch to NPCA P-channel. It is an opportunistic optimization. It works only if AP2 just holds an TXOP when AP1 switches to NPCA P-channel. ... AP MLD NPCA ICF AP1 OBSS NAV Link 1 OBSS NAV STA1 STA3 STA5 NPCA ICR Notification (Broadcast / Individual) ... DL DATA DL DATA AP2 ... Link 2 BA BA STA2 STA4 STA6 Non-AP MLD 3 Non-AP MLD 1 Non-AP MLD 2 Submission Slide 3 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Proposal 2 Before AP1 switches back to BSS P-channel from NPCA P-channel, AP2 which holds an TXOP may solicit NAV information of link 1 from the non-AP MLDs that have affiliated STAs staying on the BSS P-channel (e.g., STA5 does not do NPCA operation), so AP1 could restore the medium busy/idle status quickly. AP1 switch back to BSS P-channel ... AP MLD DL Data NPCA ICF When AP1 gets the NAV information, it can restore the medium busy/idle status AP1 OBSS NAV Link 1 OBSS NAV NPCA ICR BA STA1 STA3 STA5 DL DATA with Cross link NAV Request DL DATA ... ... AP2 Link 2 BA with cross link NAV STA2 STA4 STA6 BA Non-AP MLD 3 Non-AP MLD 1 Non-AP MLD 2 Submission Slide 4 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Summary The proposed methods can alleviate the different view problem and medium sync loss problem of NPCA procedure. Detail design can be further discussed. Submission Slide 5 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Straw Poll 1 Do you support to include the following text into the 11bn SFD? When an AP affiliated with an AP MLD operating on link 1 switches to NPCA primary channel, another affiliated AP of the AP MLD which holds an TXOP may notify the associated non-AP MLDs that have affiliated STAs operating on link 1 to switch to NPCA primary channel. Detailed design is TBD Submission Slide 6 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 Straw Poll 2 Do you support to include the following text into the 11bn SFD? Before an AP affiliated with an AP MLD operating on link 1 switches back to BSS primary channel from NPCA primary channel, another affiliated AP of the AP MLD which holds an TXOP may solicit NAV information of link 1 from the associated non-AP MLDs that have affiliated STAs operating on link 1 staying on the BSS primary channel. Detailed design is TBD Submission Slide 7 Chaoming Luo, OPPO
March 2025 doc.: IEEE 802.11-25/0540r0 References [1] Draft P802.11bn_D0.1 Submission Slide 8 Chaoming Luo, OPPO
