Dynamic Sensitivity Control for Wireless Network Throughput
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Solution Overview
Problem
In wireless communication networks, the use of a fixed clear channel assessment (CCA) threshold can limit system throughput by preventing stations from transmitting even when they could do so without causing interference, due to a default CCA threshold that is too conservative, potentially impacting network coverage and throughput.
Innovation Solution
Adapting the CCA threshold on a frame-by-frame basis based on the destination of the head-of-line frame, considering the signal-to-interference-plus-noise ratio (SINR) threshold, average received signal strength, and estimated interference levels to dynamically adjust the CCA threshold for successful decoding, allowing for differentiated thresholds between basic service sets and overlapping sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed CCA threshold is used, then the wireless medium can be reliably protected from interference, but system throughput is limited because stations cannot transmit when they could do so without causing relevant interference
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed CCA threshold to a dynamic, adaptive threshold that changes based on current channel conditions, destination requirements, and interference levels. The threshold is continuously adjusted rather than remaining static, allowing the system to optimize between throughput and reliability in real-time.
Solution Approach 2:
The patent changes the parameter of CCA threshold from a fixed value to a variable that adapts based on multiple factors including destination requirements, channel conditions, and interference levels. This parameter transformation enables the system to flexibly balance between preventing interference and maximizing throughput.
2Productivity
If the CCA threshold is set to a higher default value to improve throughput, then more transmissions can occur simultaneously, but network coverage area is negatively impacted
Solution Approach 1:
The patent applies local quality by implementing destination-specific CCA thresholds tailored to each receiving station's characteristics and channel conditions. Different destinations receive customized threshold values based on their specific requirements, rather than applying a uniform threshold across all transmissions.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing destination-specific CCA thresholds based on historical channel conditions and destination characteristics. These pre-computed thresholds are readily available when needed, enabling rapid adaptation without real-time computation delays.
3Area of stationary object
If a lower CCA threshold is used to expand coverage area, then more stations can be reached, but system throughput is reduced due to excessive carrier sensing
Solution Approach 1:
The patent uses dynamics to adjust the CCA threshold based on actual channel conditions and destination requirements rather than using a conservative fixed value. The threshold adapts to expand coverage when conditions permit while maintaining throughput efficiency.
4Reliability
If the CCA threshold is fixed at the standard value, then the exposed terminal problem is avoided, but stations are prevented from transmitting even when they could do so without causing relevant interference
Solution Approach 1:
The patent transforms the CCA threshold from a fixed standard value to a dynamic parameter that adapts to current conditions. This allows the system to maintain collision avoidance reliability while enabling transmissions that would be unnecessarily blocked by a conservative fixed threshold.
Solution Approach 2:
The patent implements feedback mechanisms that monitor channel conditions, transmission outcomes, and interference levels to continuously refine and adjust CCA thresholds. This feedback loop ensures that collision avoidance is maintained while optimizing transmission efficiency based on actual system performance.
Data Source
AI summary
Methods and devices for dynamic sensitivity control (DSC) in wireless networks are provided by adapting a clear channel assessment threshold (CCAT) on a frame-by-frame basis, based on a destination of a head-of-line (HoL) frame in a medium access control (MAC) layer transmission queue. Two different ways of protecting the communication range among devices in a basic serving set (BSS) are disclosed. In the first way, frames received from a node's BSS are differentiated, at the MAC layer, from frames received from an overlapping BSS (OBSS), and different CCATs are used for frames received from the node's BSS versus frames received from OBSS(s). In the second way, a lower bound on the CCAT value is defined based on the average received signal strength indicator (RSSI) of frames previously received from the node's BSS, and the CCAT is periodically reset to its minimum value.