TXOP Bandwidth Adaptation via Preceding Frame Sensing
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Solution Overview
Problem
In wireless networks, STAs with static bandwidth operation cannot adapt to channel conditions, leading to inefficient transmissions and potential collisions due to hidden node issues, while STAs with dynamic bandwidth operation may experience corrupted or underutilized packets.
Innovation Solution
A transmitting STA adapts its bandwidth or transmission mask based on information from preceding frames, specifically using non-HT duplicate frames to ensure efficient communication by indicating dynamic bandwidth operation mode and available bandwidths, allowing for optimal bandwidth utilization and collision avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If STAs operate in static bandwidth mode, then device complexity is reduced, but transmission efficiency deteriorates due to inability to adapt to channel conditions
Solution Approach 1:
The patent implements dynamic bandwidth operation where STAs can switch between different bandwidth modes (20MHz, 40MHz, 80MHz, 160MHz) based on real-time channel conditions. The transmitting STA determines available bandwidth by sensing channel availability and dynamically adjusts transmission bandwidth accordingly, allowing the system to adapt from static to dynamic operation to improve transmission efficiency without permanently increasing device complexity.
2Productivity
If STAs operate in dynamic bandwidth mode, then transmission efficiency is improved, but reliability deteriorates due to packet corruption and bandwidth underutilization
Solution Approach 1:
The patent employs preliminary channel sensing and bandwidth determination before transmission. The transmitting STA performs clear channel assessment (CCA) to determine which subchannels are available, then selects the appropriate bandwidth mode in advance. This preliminary action ensures that transmissions are made only on available channels with appropriate bandwidth selection, preventing packet corruption from channel conflicts and avoiding bandwidth underutilization by not selecting wider channels when subchannels are busy.
Solution Approach 2:
The patent implements feedback mechanisms where receiving STAs send acknowledgment frames (such as BA frames) that indicate successful reception or corruption of data packets. The transmitting STA uses this feedback to adjust future transmission decisions, including bandwidth selection and retransmission strategies. This feedback loop improves reliability by allowing the system to learn from channel conditions and transmission outcomes, reducing packet corruption through adaptive bandwidth selection.
3Productivity
If transmitting STA uses wider bandwidth, then productivity is improved, but harmful factors increase due to hidden node collisions
Solution Approach 1:
The patent performs preliminary channel sensing across multiple subchannels before initiating wider bandwidth transmissions. The transmitting STA checks each subchannel for activity and determines the maximum available bandwidth based on this preliminary assessment. By performing this preliminary action, the system can safely utilize wider bandwidths when subchannels are clear while avoiding collisions with hidden nodes that would corrupt transmissions.
Data Source
AI summary
A method of communicating in a wireless network comprises controlling a bandwidth or a transmission mask of a PPDU transmitted by a transmitting STA to a receiving STA within a TXOP based on bandwidth information in at least one preceding frame within the TXOP. The method and associated devices allow a control of TXOP bandwidth or transmission mask where devices capable of both dynamic and static bandwidth operation may be present within the network. The preceding frame may include a non-HT frame of a non-HT duplicate frame exchange, such as a non-HT duplicate RTS/CTS exchange or a BAR/BA exchange, where the bandwidth or the transmission mask would be controlled by being limited to be less than or equal to a bandwidth of the non-HT frame. The preceding frame may include a preceding PPDU, where the bandwidth or the transmission mask would be limited to be less than or equal to a bandwidth of the preceding PPDU.