Dynamic CCA Threshold for Wi-Fi Simultaneous Transmissions
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Solution Overview
Problem
Current Wi-Fi systems face limitations in performance due to the use of static Clear Channel Assessment (CCA) thresholds, which can lead to reduced simultaneous transmissions and increased re-transmissions, especially when exposed to neighboring AP areas.
Innovation Solution
Implement a method for dynamic sensitivity threshold adjustment in wireless communications systems, where entities assess the channel availability by determining the received signal strength relative to dynamic CCATs and consider the type of ongoing transmission to decide whether to transmit or defer, thereby protecting high-impact transmissions from interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a static Clear Channel Assessment threshold is used, then channel access is simple and reliable, but system throughput is limited and simultaneous transmissions are reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a static CCA threshold to a dynamic threshold that adapts based on transmission type. The system dynamically adjusts the CCA threshold depending on whether the detected transmission is high-impact (requiring conservative threshold) or low-impact (allowing aggressive threshold), thereby optimizing throughput while managing complexity through rule-based adaptation rather than continuous optimization
Solution Approach 2:
The patent changes the parameter of CCA threshold based on transmission characteristics. By detecting the type of ongoing transmission and adjusting the threshold parameter accordingly, the system allows more simultaneous transmissions when the threshold is raised for low-impact transmissions, while maintaining reliability for high-impact transmissions through a lower threshold
2Reliability
If a conservative CCA threshold is used, then transmission reliability is maintained, but simultaneous transmissions are limited and spectrum usage is reduced
Solution Approach 1:
The patent applies local quality by differentiating the CCA threshold based on the local characteristics of the detected transmission. Instead of using a uniform conservative threshold for all transmissions, the system locally adapts the threshold based on transmission type (high-impact vs. low-impact), allowing aggressive threshold for low-impact transmissions to improve spectrum usage while maintaining conservative threshold for high-impact transmissions to ensure reliability
3Productivity
If dynamic CCA threshold adjustment is implemented, then simultaneous transmissions are increased, but interference to ongoing transmissions may increase
Solution Approach 1:
The patent implements feedback by continuously monitoring the type of ongoing transmission and using this information to adjust the CCA threshold in real-time. The system feedbacks based on whether the detected transmission is high-impact or low-impact, dynamically raising or lowering the threshold accordingly to balance the number of simultaneous transmissions with the protection of ongoing transmissions from harmful interference
Data Source
AI summary
A method performed in an entity for transmitting in a communications system. The method comprises assessing a channel to be available for transmission by establishing an on-going transmission to have a received signal strength such as to allow simultaneous transmission in view of a first clear channel assessment threshold; establishing type of transmission of the on-going transmission; and determining, based on the established type of transmission, whether to transmit or to defer transmitting. A corresponding entity, computer programs and computer program products are also provided.