Wireless Apparatus Priority-Based CCA Threshold Control
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Solution Overview
Problem
The reliability of wireless communication is degraded due to the increased likelihood of channel busy conditions when multiple basic service sets (BSSs) using the same frequency channel are adjacent, leading to decreased throughput and increased transmission latency, particularly affecting real-time applications.
Innovation Solution
A wireless apparatus with a threshold determination unit that sets different CCA thresholds based on frame priority, allowing higher priority frames to be transmitted with a higher likelihood of channel availability by adjusting the CCA threshold values when detecting frames from other BSSs, thereby reducing the exposure of terminals and enhancing communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single CCA threshold is used for all frames, then the system is simple to operate, but transmission latency increases for high-priority frames due to channel busy conditions
Solution Approach 1:
The patent applies local quality by setting different CCA thresholds based on frame priority levels. High-priority frames use a first CCA threshold value while low-priority frames use a second CCA threshold value, allowing each frame type to have optimized channel access conditions suited to its specific requirements rather than using a uniform threshold for all traffic.
Solution Approach 2:
The patent implements dynamics by making the CCA threshold variable rather than fixed. The threshold determination unit dynamically selects between different threshold values based on the priority level of the frame being transmitted, enabling the system to adapt its channel access behavior to the specific needs of each transmission.
2Productivity
If multiple BSSs use the same frequency channel in adjacent areas, then frequency utilization is improved, but communication reliability deteriorates due to increased channel busy conditions
Solution Approach 1:
The patent applies local quality by differentiating threshold settings based on frame priority, allowing high-priority traffic to access the channel more aggressively even in dense BSS environments. This enables frequency utilization to be maintained while protecting time-sensitive communications from degradation due to channel busy conditions.
Solution Approach 2:
The patent implements parameter changes by modifying the CCA threshold parameter according to frame priority. By changing this critical parameter, the system can adjust channel access behavior to maintain communication reliability for high-priority frames while still allowing frequent channel access for frequency utilization.
3Productivity
If a higher CCA threshold is used to increase channel access probability, then throughput is improved, but transmission reliability for high-priority frames deteriorates due to increased interference
Solution Approach 1:
The patent applies local quality by assigning different CCA threshold values to different frame priority levels. High-priority frames use a more conservative threshold to ensure reliable transmission, while low-priority frames can use a higher threshold to maximize throughput, allowing each frame type to achieve its optimal performance characteristics.
Solution Approach 2:
The patent implements parameter changes by adjusting the CCA threshold parameter based on frame priority requirements. This dynamic parameter adjustment enables the system to optimize both throughput and transmission reliability by selecting appropriate threshold values matching the specific needs of each frame being transmitted.
Data Source
AI summary
A wireless apparatus according to an aspect of the present invention includes a threshold determination unit that determines a threshold used for determining a usage state of a frequency channel, the threshold determination unit setting the threshold to a first value when a first priority that is a priority of a frame to be transmitted is a first priority level and setting the threshold to a second value higher than the first value when the first priority is a second priority level higher than the first priority level, and a carrier sense control unit that determines the usage state of the frequency channel based on a comparison between reception power of a frame detected on the frequency channel by carrier sense and the threshold.