Wireless Terminal Spatial Reuse via Adaptive CCA Thresholds
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Solution Overview
Problem
Current wireless LAN systems face challenges in providing high-efficiency and high-performance communication in high-density environments, particularly in overlapped Basic Service Sets (BSS) where interference and unfair channel access occur, leading to inefficiencies in data transmission and increased interference between terminals.
Innovation Solution
A wireless communication method that uses Clear Channel Assessment (CCA) with adjustable thresholds based on BSS identifier information to determine channel busy states, allowing for efficient spatial reuse and fair channel access by distinguishing between legacy and non-legacy terminals, and adjusting data transmission periods based on received signal strength and BSS identifier matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single CCA threshold is used for all terminals, then the channel access rule is simple, but interference between terminals in overlapped BSS cannot be effectively managed and spatial reuse is limited
Solution Approach 1:
The patent applies local quality by distinguishing between different types of terminals (legacy terminals and non-legacy terminals) and applying different CCA thresholds to each group. This allows the system to optimize channel access behavior for different terminal types, enabling better spatial reuse in overlapped BSS while maintaining manageable complexity through clear classification.
Solution Approach 2:
The patent implements dynamics by making the CCA threshold adaptive rather than fixed. The threshold is dynamically adjusted based on the terminal type and channel conditions, allowing the system to respond to varying environmental conditions and terminal capabilities, thereby improving spatial reuse capability.
2Object-affected harmful factors
If CCA threshold is adjusted to enable spatial reuse, then interference between terminals is reduced, but channel access fairness between legacy and non-legacy terminals deteriorates
Solution Approach 1:
The patent resolves the fairness issue by applying different CCA thresholds to different terminal groups. Legacy terminals use a first CCA threshold while non-legacy terminals use a second CCA threshold, allowing each group to have appropriate access rights that maintain fairness within their respective groups while enabling spatial reuse overall.
Solution Approach 2:
The patent segments the terminal population into legacy and non-legacy groups, each with dedicated CCA threshold parameters. This segmentation allows independent optimization of access behavior for each group, preventing the unfairness that would result from applying a uniform threshold across all terminals.
3Productivity
If higher CCA threshold is used for non-legacy terminals, then data transmission efficiency is improved, but legacy terminals experience increased channel access delay
Solution Approach 1:
The patent addresses this contradiction by assigning different quality levels (CCA thresholds) to different terminal types. Non-legacy terminals benefit from the higher second CCA threshold that enables spatial reuse and improved efficiency, while legacy terminals use the more conservative first CCA threshold that maintains their channel access timing, thus resolving the trade-off through differentiated treatment.
Data Source
AI summary
The present invention relates to a wireless communication method for simultaneous data communication and a wireless communication terminal using the same, and more particularly, to a wireless communication method for suppressing interference between terminals and ensuring fairness when performing data simultaneous communication for spatial reuse of communication system and wireless communication terminal using the same.For this, provided are a wireless communication method and a wireless communication terminal using the same. The method includes: receiving a wireless signal of a specific channel; extracting basic service set (BSS) identifier information of the received wireless signal; extracting length information from the wireless signal wherein the length information represents information relating to a transmission completion time point of the wireless signal; and adjusting a data transmission period of the terminal based on the extracted length information, when the BSS identifier information of the wireless signal is different from BSS identifier information of the terminal.