Adaptive NAV Switching for OBSS Interference in 802.11ax
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Solution Overview
Problem
The combination of OBSS_PD-based SR and Two NAVs in IEEE 802.11ax wireless communication systems complicates the behavior of the entire wireless communication system, leading to reduced throughput due to interference and complex settings.
Innovation Solution
The system adaptively switches the Network Allocation Vector (NAV) used for virtual carrier sense based on the presence of IEEE 802.11ax-compatible and incompatible terminals, allowing the access point and terminal to adjust settings to avoid interference by enabling or disabling OBSS_PD-based SR and Two NAVs accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If OBSS_PD-based SR and Two NAVs are used in combination to avoid interference in OBSS environment, then interference between BSS and OBSS is reduced, but the behavior of the entire wireless communication system becomes very complicated
Solution Approach 1:
The patent applies dynamics by making the NAV switching behavior adaptive rather than static. The terminal dynamically switches between single NAV and dual NAV modes based on the presence of incompatible terminals detected through capability information exchange. This dynamic adaptation resolves the contradiction by activating the complex dual NAV behavior only when necessary (when incompatible terminals are present), while maintaining simple single NAV behavior when incompatible terminals are absent, thus reducing overall system complexity while still providing interference avoidance capability when needed.
2Productivity
If OBSS_PD-based SR is enabled to improve throughput in Dense deployment environment, then throughput of access point is improved, but interference from OBSS still occurs in overlapping areas
Solution Approach 1:
The patent applies parameter changes by modifying the operational parameters of the NAV mechanism based on the communication environment. Specifically, the system changes the number of NAVs maintained (one or two) and the switching behavior based on the presence of incompatible terminals. This parameter adaptation allows the system to optimize throughput by using OBSS_PD-based SR with dual NAVs when incompatible terminals are present, while maintaining simpler operation when they are absent, thus improving overall productivity without permanently suffering from OBSS interference.
Data Source
AI summary
A wireless communication system according to the present disclosure includes an access point (AP) and a terminal (STA) that belong to a BSS. The STA compatible with IEEE 802.11ax switches, under an environment where the AP and the STA compatible with IEEE 802.11ax enable OBSS_PD-based SR, an NAV used for virtual carrier sense according to whether only the STA compatible with IEEE 802.11ax is present as the STA or both the STA compatible with IEEE 802.11ax and the STA incompatible with IEEE 802.11ax are present as the STAs.