Wireless Terminal Clear Channel Assessment Using BSS Identifier
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Solution Overview
Problem
Current wireless LAN technologies face challenges in providing high-efficiency and high-performance communication in high-density environments, particularly in overlapped Basic Service Set (BSS) scenarios, where data transmission opportunities and rates are limited due to interference and inefficient channel utilization.
Innovation Solution
A wireless communication method that uses BSS identifier information to determine channel busy states through clear channel assessment (CCA), adjusting CCA thresholds based on whether the BSS identifier matches the terminal's identifier, and utilizing both legacy and non-legacy wireless LAN information to optimize channel reuse and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional clear channel assessment (CCA) is used without BSS identifier information, then channel availability is determined based on signal strength alone, but channel reuse efficiency is limited and interference cannot be minimized
Solution Approach 1:
The patent changes the parameter used in CCA from signal strength alone to a combination of signal strength and BSS identifier information. By introducing BSS identifier matching as an additional parameter, the system can distinguish between same-BSS and different-BSS transmissions, enabling more efficient channel reuse while maintaining manageable complexity through structured decision logic.
Solution Approach 2:
The BSS identifier information acts as an intermediary element that mediates between the CCA mechanism and channel reuse decisions. This intermediary allows the system to make informed decisions about whether to reuse a channel based on whether the transmission belongs to the same BSS, thereby improving productivity without requiring complete redesign of the CCA framework.
2Productivity
If CCA threshold is set low to detect all signals, then channel availability is accurately detected, but channel reuse opportunities are reduced due to excessive channel busy determinations
Solution Approach 1:
The patent applies local quality by differentiating the evaluation criteria based on the specific characteristics of detected signals. When BSS identifier information is available, the system applies different judgment standards for same-BSS versus different-BSS transmissions. This localized differentiation allows the system to be more permissive (higher effective threshold) for different-BSS signals, increasing transmission opportunities while maintaining accuracy through BSS-based discrimination.
Solution Approach 2:
The CCA mechanism becomes dynamic by adjusting the effective threshold based on real-time BSS identifier matching results. Rather than using a fixed threshold, the system dynamically adapts its channel busy determination logic based on whether the detected signal belongs to the same BSS, thereby optimizing the balance between detection accuracy and channel reuse opportunities in varying network conditions.
3Productivity
If BSS identifier information is processed for every signal, then channel reuse efficiency is maximized, but processing time and complexity increase
Solution Approach 1:
The system performs preliminary action by extracting and storing BSS identifier information when first detected, so that when subsequent signals are received, the identifier matching can be performed quickly without re-extracting the information. This preliminary preparation reduces the processing time for each subsequent CCA operation while maintaining the benefits of BSS-based channel reuse efficiency.
Solution Approach 2:
The patent merges the BSS identifier extraction and CCA decision-making processes into a unified operation. By combining these functions, the system avoids separate processing stages and reduces overall processing time. The merged approach allows simultaneous extraction of BSS information and execution of channel availability determination, thereby reducing time loss while maintaining high channel utilization efficiency.
4Reliability
If different CCA thresholds are applied for legacy and non-legacy terminals, then fairness between terminal types is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent changes the CCA threshold parameter dynamically based on terminal type (legacy versus non-legacy). By introducing this parameter variation, the system achieves fairness between different terminal types - legacy terminals use a lower threshold for conservative channel sharing, while non-legacy terminals can use higher thresholds to enable more aggressive channel reuse. This parameter change approach implements fairness without requiring fundamental redesign of the terminal architecture.
Solution Approach 2:
The CCA mechanism becomes dynamic by automatically adjusting thresholds based on terminal identification. The system dynamically selects appropriate thresholds based on whether the terminal is legacy or non-legacy, enabling fair treatment of different terminal types without manual configuration. This dynamic adaptation simplifies implementation compared to static multi-mode designs, as the terminal itself determines which threshold to use based on its own capabilities.
Data Source
AI summary
The present invention relates to a wireless communication method for clear channel assessment and a wireless communication terminal using the same, and more particularly, to a wireless communication method and a wireless communication terminal for performing efficient clear channel assessment based on BBS identifier information of non-legacy wireless LAN information. To this end, provided is a wireless communication method including: receiving a radio signal of a specific channel; measuring a signal strength of the received radio signal; and determining whether the specific channel is busy based on the measured signal strength and BSS identifier information of the radio signal.