BSSID-Aware CCA Control for Mixed HE and Non-HE Wireless LANs
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Solution Overview
Problem
In high-density wireless LAN environments, the CSMA/CA protocol leads to reduced throughput due to increased channel occupancy and interference among BSSs, especially when HE and Non-HE stations are mixed, affecting transmission opportunities and management frame reception.
Innovation Solution
A wireless communication system and method that dynamically control the CCA threshold based on BSSID detection in the frame preamble for HE format and MAC header for Non-HE format, adjusting demodulation and carrier sense to optimize transmission opportunities and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the CCA threshold is lowered to detect more signals, then interference detection capability is improved, but transmission opportunities are reduced due to increased channel busy detection
Solution Approach 1:
The patent applies local quality by differentiating the CCA threshold based on the format of the received signal. For HE format signals, a first (higher) CCA threshold is used, while for non-HE format signals, a second (lower) CCA threshold is used. This allows the system to optimize interference detection for each signal type locally, rather than using a uniform threshold, thereby resolving the contradiction between detection capability and transmission opportunity.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the CCA threshold based on the detected signal format. The threshold is not fixed but changes according to whether the received signal is in HE format or non-HE format. This dynamic adaptation allows the system to optimize performance in real-time, balancing interference detection and transmission opportunities based on current channel conditions.
2Productivity
If the CCA threshold is raised to increase transmission opportunities, then throughput is improved, but detection precision of interference signals deteriorates
Solution Approach 1:
The patent applies local quality by setting different CCA thresholds for different signal formats. HE format signals use a higher threshold to improve transmission opportunities, while non-HE format signals use a lower threshold to maintain detection precision. This localized optimization for each signal type resolves the contradiction between throughput and detection precision.
Solution Approach 2:
The patent changes the CCA threshold parameter based on the signal format detection. By switching between two different threshold values (first threshold for HE format, second threshold for non-HE format), the system adapts the detection sensitivity parameter to match the characteristics of the received signal, thereby optimizing both throughput and detection precision.
3Reliability
If demodulation is continued for all received signals, then reliable signal reception is ensured, but transmission opportunities are lost due to extended channel occupancy
Solution Approach 1:
The patent applies local quality by determining whether to continue or stop demodulation based on the format of the received signal. For HE format signals, demodulation is stopped after format detection to free up the channel for transmission. For non-HE format signals, demodulation continues to ensure reliable reception. This localized decision-making resolves the contradiction between reliability and productivity.
Solution Approach 2:
The patent implements partial action by performing only format detection for HE format signals without completing full demodulation, while performing full demodulation for non-HE format signals. This partial processing approach allows the system to optimize channel utilization for HE format signals while maintaining reliability for non-HE format signals.
4Adaptability or versatility
If the system supports both HE and Non-HE stations, then compatibility and versatility are improved, but device complexity increases due to multiple CCA threshold management
Solution Approach 1:
The patent applies local quality by managing different CCA thresholds for different signal formats in a structured manner. The system identifies the signal format first, then applies the appropriate threshold locally. This approach maintains multi-format compatibility while organizing the complexity through format-based differentiation, making the system manageable despite supporting multiple standards.
Solution Approach 2:
The patent segments the CCA threshold management into two distinct paths: one for HE format signals and another for non-HE format signals. By dividing the threshold management into separate segments based on format type, the system handles complexity in an organized way, maintaining versatility while avoiding a single monolithic complex control structure.
Data Source
AI summary
A format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format, and a format that does not include a BSSID within the preamble but includes a BSSID in a MAC header is a Non-HE format; and a wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above, and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the HE format and the BSSID in the received frame is not consistent with its own BSS.