Dynamic Channel Sensing in Wireless LAN Backoff

The patent applies different CCA conditions to different channels based on their characteristics. The primary channel uses a first CCA condition with a lower threshold, while secondary channels use a second CCA condition with a higher threshold. This local differentiation allows the system to optimize for both transmission capability and channel access fairness by treating each channel according to its specific role and occupancy status.

The patent implements preliminary anti-action by having stations sense the primary channel during the backoff period and freeze their backoff counters when the channel is detected as busy. This preemptive measure prevents multiple stations from transmitting simultaneously by ensuring they all wait until the channel is clearly idle, thereby reducing collision probability while maintaining transmission efficiency.

The patent applies different CCA thresholds to different channels based on their specific requirements. The primary channel uses a lower threshold for accurate sensing, while secondary channels use a higher threshold to reduce false detections. This local quality differentiation resolves the contradiction by optimizing each channel's threshold according to its role.

The patent segments the channel access process into two distinct parts: backoff on the primary channel and transmission on either primary or secondary channels. This segmentation allows the backoff phase to be simple (using only the primary channel) while the transmission phase provides flexibility (able to use both primary and secondary channels based on availability), thereby resolving the contradiction between simplicity and flexibility.