Understanding NPCA Switching Delays in IEEE 802.11-25/1021r0
Explore the discussion on NPCA switching delays and switch back delays in IEEE 802.11-25/1021r0 document. The proposed solution involves TWT-Based NPCA Parameter Negotiation for AP and non-AP STAs during TWT Service Periods, addressing challenges with varying switching delays for different scenarios.
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June 2025 doc.: IEEE 802.11-25/1021r0 Discussion on NPCA switching delay Date: 2025-06-06 Authors: Name Affiliations Address Phone email honglonglong@ruijie.com.cn Longlong Hong Hui Che Ke Zhong Ruijie Networks Co., Ltd Mengying Lin Fangchang Guo Submission Slide 1 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 Introduction [Motion 124] An NPCA STA shall indicate the following to its peer NPCA STA[1] NPCA switching delay time it needs to switch from the BSS Primary channel to the NPCA Primary channel NPCA switch back delay time it needs to switch from the NPCA Primary channel to the BSS Primary channel Delay values range between 0 and 256 us with a 4 us resolution The NPCA switching delay and NPCA switch back delay have been discussed in multiple proposals[2-5]. This contribution discusses different NPCA switching delays and NPCA switch back delays. Submission Slide 2 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 Problem Statement NPCA non-AP STAs have different NPCA switching/switch back delays Case 1: Short NPCA switching/switch back delay when the NPCA primary channel is within their operating bandwidth Case 2: Long NPCA switching/switch back delay when the NPCA primary channel is outside their operating bandwidth For NPCA APs, balancing fairness and efficiency with different switching/switch back delays is challenging. Short NPCA switching delay NPCA Operation NPCA Operation Long NPCA switching delay Primary channel unavailable Submission Slide 3 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 Proposed solution TWT-Based NPCA Parameter Negotiation: AP and non-AP STAs negotiate NPCA parameters during TWT Service Periods. TWT NPCA switching delay, TWT NPCA switch back delay For different TWT groups, such as TWT Group 1{short NPCA switching/switch back delay} TWT Group 2{long NPCA switching/switch back delay} During a TWT SP, when OBSS interference is detected: NPCA AP and non-AP STAs shall perform NPCA operation with the TWT NPCA switching/switch back delay. TWT SP NPCAOperation Non-primary channel TWT NPCA switch back delay TWT NPCA switching delay Primary channel OBSS PPDU OBSS PPDU Submission Slide 4 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 Summary In this contribution, we discusses NPCA switching delay and NPCA switch back delay AP and non-AP STAs negotiate NPCA parameters during TWT Service Periods During TWT SP, AP and non-AP STAs switch to the non-primary channel with TWT NPCA switching delay when an OBSS interference is detected switch back to the primary channel with TWT NPCA switch back delay when the OBSS ends Submission Slide 5 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 Straw Poll Do you agree that AP and non-AP STAs negotiate NPCA parameters within TWT SP? Submission Slide 6 Longlong Hong et al., Ruijie Networks Co., Ltd
June 2025 doc.: IEEE 802.11-25/1021r0 References [1] Draft IEEE P802.11bn D0.2 [2] 11-24/1218r1, NPCA Next level discussions, Gaurang Naik [3] 11-24/1222r1, NPCA (Secondary Channel Usage) Follow Up, Liwen Chu [4] 11-25/0493r0, NPCA during scheduled periods, Zhenpeng Shi [5] 11-25/624r0, Further considerations for NPCA operation, Vishnu Ratnam Submission Slide 7 Longlong Hong et al., Ruijie Networks Co., Ltd
