Non-Primary Channel Access for OBSS Congestion
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining high system throughput, especially in scenarios with Overlapping Basic Service Sets (OBSS) activity, which can lead to channel congestion and reduced data transmission efficiency.
Innovation Solution
A wireless device is configured to determine backoff channels for a Basic Service Set (BSS) operating channel, including a primary channel and a non-primary channel access (NPCA) primary channel. The device announces these channels to a second wireless device and switches to the NPCA primary channel when OBSS activity satisfies certain conditions, such as an OBSS transmit opportunity (TXOP) or physical layer protocol data unit (PPDU) duration exceeding a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary channel is used for data transmission, then high system throughput is achieved, but channel congestion occurs when OBSS activity is present
Solution Approach 1:
The patent segments the channel access opportunity by introducing a non-primary channel (NPCA) as an alternative to the primary channel. When OBSS activity is detected on the primary channel, the system switches to the NPCA for data transmission, effectively dividing the channel access into two separate paths to avoid congestion.
Solution Approach 2:
The NPCA acts as an intermediary channel between the primary channel and the data transmission process. It serves as a backup path that mediates the transmission when the primary channel is blocked by OBSS activity, enabling continuous communication without direct conflict.
2Productivity
If channel switching is implemented to avoid OBSS activity, then data transmission efficiency is improved, but channel switch delay increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring the NPCA and maintaining it in a ready state before OBSS activity occurs. The backoff counter for the NPCA is maintained separately, allowing for rapid switching without requiring full re-initialization, thus reducing the effective switch delay.
Solution Approach 2:
The patent implements dynamic channel selection where the system can flexibly switch between the primary channel and NPCA based on real-time OBSS activity detection. The dynamic nature allows the system to adapt channel usage patterns, optimizing the balance between switching frequency and transmission efficiency.
3Object-affected harmful factors
If the primary channel is switched to NPCA during OBSS TXOP, then channel congestion is avoided, but additional channel management complexity is introduced
Solution Approach 1:
The patent segments the channel management process into distinct components: primary channel monitoring for OBSS detection and separate NPCA management for data transmission. This segmentation allows each component to be managed independently, reducing the complexity of coordinating channel switches during OBSS TXOP.
Solution Approach 2:
The system manages complexity by changing key parameters such as the backoff counter state and channel selection logic based on OBSS activity detection. When OBSS activity is detected, the system changes its operational parameters to switch to NPCA, providing a systematic approach to managing channel transitions.
Data Source
AI summary
Embodiments of a method and apparatus for wireless communications are disclosed. In an embodiment, a wireless device includes a controller configured to determine backoff channels for a Basic Service Set (BSS) operating channel that include a primary channel and a non-primary channel access (NPCA) primary channel and a wireless transceiver configured to announce to a second wireless device the backoff channels of the BSS operating channel and to switch to the NPCA primary channel for communicating between the wireless device and the second wireless device.