Dynamic BSS Transition Threshold for Wireless LAN
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Solution Overview
Problem
In wireless LAN systems, setting an appropriate BSS transition threshold is challenging, especially in home environments where multiple APs belong to the same ESS and are unsupported by service operators, leading to suboptimal communication quality and inefficient scanning processes.
Innovation Solution
A wireless communication device and method that dynamically sets a threshold for BSS transition based on information from external devices, using both a first threshold for comparison with own device reception and a second threshold for differences in reception power from other APs, allowing for more informed BSS transitions without extensive scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed BSS transition threshold is set by service operators, then the system is simple to operate, but it becomes difficult to set appropriate thresholds in home environments with multiple unsupported APs
Solution Approach 1:
The system enables APs to automatically determine and set their own BSS transition thresholds by measuring received signal strengths from other APs and calculating appropriate values without requiring service operator intervention. This self-service mechanism allows the network to adapt automatically to different deployment scenarios including home environments with multiple unsupported APs.
Solution Approach 2:
The BSS transition threshold is transformed from a static fixed value into a dynamic parameter that APs can adjust based on real-time measurements of the wireless environment. Each AP dynamically determines its threshold by measuring received signal strengths from neighboring APs and calculating appropriate transition values, enabling adaptation to changing network conditions and deployments.
2Measurement precision
If stations perform extensive scanning to find optimal BSS, then transition decisions are accurate, but communication efficiency deteriorates due to frequent scanning
Solution Approach 1:
APs perform preliminary measurements of received signal strengths from other APs and pre-calculate appropriate BSS transition thresholds before stations need to make transition decisions. This preliminary action by APs eliminates the need for stations to perform extensive scanning, as the threshold information is already prepared and can be used directly for accurate transition decisions.
Solution Approach 2:
The patent introduces an intermediary mechanism where APs act as mediators that measure signal strengths and calculate transition thresholds on behalf of stations. Instead of stations directly scanning and measuring all APs themselves, the APs perform these measurements and provide the calculated threshold information to stations, reducing the scanning burden on stations while maintaining accurate transition decisions.
3Device complexity
If a single threshold is used for all APs, then the system is simple to manage, but it prevents optimal transitions in heterogeneous network conditions
Solution Approach 1:
Instead of applying a uniform threshold across all APs, the system enables each AP to determine and set its own local threshold based on its specific received signal strength measurements from neighboring APs. This local quality approach allows each AP to have a customized threshold optimized for its local environment, improving transition decisions and communication quality in heterogeneous network conditions while maintaining simple threshold management from the network operator perspective.
Data Source
AI summary
[Problem] To enable a more appropriate BSS transition threshold to be set in a wireless LAN system. [Solution] A wireless communication device functioning as an access point of a wireless LAN includes: a control unit that dynamically sets a threshold used when a station belonging to a BSS of its own device attempts to transit to another BSS belonging to the same ESS as the BSS based on information included in a wireless signal from an external device.