Discussion on Different View Problem of NPCA in IEEE 802.11-25
Explore the critical issue of Different View Problem in Non-Populated Channel Access (NPCA) within IEEE 802.11-25, focusing on hidden node problems, attenuation effects, and solutions to mitigate these issues. Discover detailed insights and proposed strategies for enhancing network performance.
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Jan 2025 doc.: IEEE 802.11-25/0001r0 Discussion on different view problem of NPCA Date: 2024-05-05 Authors: Name Company Address Phone Email Liangxiao Xin Liuming Lu v-xinliangxiao@oppo.com Chaoming Luo Wei Dong OPPO Ning Gao Yapu Li Submission Slide 1 Liangxiao Xin, OPPO
Jan 2025 doc.: IEEE 802.11-25/0001r0 Introduction Different view problem of NPCA has been discussed and seems a critical problem that needs to be solved. In this contribution, we discuss the possible solutions for Different view problem. Submission Slide 2 Liangxiao Xin, OPPO
Jan 2025 doc.: IEEE 802.11-25/0001r0 Hidden Node Problem The hidden node problem can be caused by obstacle or attenuation. Node A and node C are hidden node to each other. Different view problem is basically hidden node problem. C Obstacle A B C Tx Range A B Scenario 2: B can hear C but A cannot hear C due to attenuation Scenario 1: B can hear C but A cannot hear C due to obstacle Submission Slide 3 Liangxiao Xin, OPPO
Jan 2025 doc.: IEEE 802.11-25/0001r0 Different View Problem due to Attenuation Different view problem happens when there is a node C at the non-overlapping area of the sensing range of node A and node B. Node A and node B are a transmission pair Node B can hear the transmission of node C Node A cannot hear the transmission of node C C A B Sensing range of node A Sensing range of node B Submission Slide 4 Liangxiao Xin, OPPO
Nov 2024 doc.: IEEE 802.11-25/0001r0 Different View Problem due to Attenuation The non-overlapping area (yellow area) of the sensing range of node A and node B decides the probability of the occurrence of different view problem. The non-overlapping area decreases, the probability of the occurrence of different view problem decreases C A B Channel sensing range of node A Channel sensing range of node B Submission Slide 5 Liangxiao Xin, OPPO
Nov 2024 doc.: IEEE 802.11-25/0001r0 Mitigation against Different View Problem The goal is to decrease the non-overlapping area (yellow area) of the sensing range of node A and node B Solution: NPCA is enabled between AP and non-AP STA when the distance between the two nodes is sufficiently short (e.g., RSSI > TBD threshold). C A B Channel sensing range of node A Channel sensing range of node B Submission Slide 6 Liangxiao Xin, OPPO
Nov 2024 doc.: IEEE 802.11-25/0001r0 Different View Problem due to Obstacle If the different view problem is caused by obstacle, then the short distance between node A and node B may not solve the problem. The mechanism to solve this problem needs further discussion. C Obstacle A B Submission Slide 7 Liangxiao Xin, OPPO
Nov 2024 doc.: IEEE 802.11-25/0001r0 Summary In this contribution, we discuss the different view problem of NPCA and propose the possible solution. If the different view problem is caused by attenuation, the problem can be solved by shorten the distance between AP and non-AP STA If the different view problem is caused by obstacle, we need another mechanism to solve the problem. Submission Slide 8 Liangxiao Xin, OPPO
Nov 2024 doc.: IEEE 802.11-25/0001r0 SP1 Do you support to include the following in SFD? 11bn shall define a mechanism to mitigate different view problem of NPCA . Submission Slide 9 Liangxiao Xin, OPPO
