Wireless Communication Apparatus BSS Mode Selection
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Solution Overview
Problem
In IEEE802.11n wireless LAN systems, the centralized control station's inappropriate selection of Basic Service Set (BSS) operational mode leads to reduced throughput due to inefficient band extension and unnecessary switching between 20 MHz and 40 MHz communication modes.
Innovation Solution
A wireless communication apparatus that selects the BSS operational mode based on the load amount of the extension channel, using a selection unit to choose between 20 MHz only, 20/40 MHz, and PCO modes, and generates a management frame to notify terminals of the selected mode, thereby optimizing media access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the centralized control station selects the 20 MHz only mode to ensure stable communication, then reliability is improved, but the throughput is reduced due to inability to utilize 40 MHz band extension
Solution Approach 1:
The system dynamically selects between 20 MHz only mode, 20/40 MHz mode, and PCO mode based on real-time channel load conditions. When extension channel load is low, 40 MHz mode is selected to maximize throughput; when load is high, 20 MHz mode is selected to ensure stability, thus adaptively optimizing performance
Solution Approach 2:
The BSS operational mode is changed as a controllable parameter based on extension channel load measurements. The system monitors channel load and adjusts the bandwidth parameter (20 MHz vs 40 MHz) and operational mode (20/40 MHz vs PCO) to optimize the trade-off between throughput and stability
2Productivity
If the centralized control station selects the PCO mode to enable 40 MHz communication, then throughput is improved, but loss of time occurs due to unnecessary switching between 20 MHz and 40 MHz when no 40 MHz terminal is present
Solution Approach 1:
The system performs preliminary detection of terminal types and extension channel load conditions before selecting the BSS operational mode. By提前 identifying whether 40 MHz terminals are present and assessing channel load, the system avoids unnecessary mode switching and selects the most appropriate mode from the start
Solution Approach 2:
The system autonomously monitors extension channel load and terminal capabilities, then automatically selects the optimal BSS operational mode without requiring manual configuration or external intervention. The control station serves itself by making intelligent mode selection decisions based on real-time conditions
3Productivity
If the centralized control station selects the 20/40 MHz mode to maximize bandwidth utilization, then throughput is improved, but adaptability deteriorates when extension channel load is high causing throughput deterioration
Solution Approach 1:
The system continuously monitors extension channel load as feedback and uses this information to adjust BSS operational mode selection. When feedback indicates high load, the system adapts by selecting 20 MHz only mode or PCO mode; when load is low, it selects 20/40 MHz mode, thus adaptively responding to changing conditions
Solution Approach 2:
The BSS operational mode is made dynamic rather than fixed, allowing the system to transition between 20 MHz only mode, 20/40 MHz mode, and PCO mode based on real-time extension channel load conditions. This dynamic adaptation ensures optimal performance across varying network environments
Data Source
AI summary
There is disclosed a wireless communication apparatus in which a first wireless communication using one first channel of two first channels each having a first bandwidth, and a second wireless communication using a second channel having a second bandwidth wider than the first bandwidth and having a band overlapping those of the two first channels are performed. A selection unit selects a Basic Service Set (BSS) operational mode on the basis of a load amount of the other first channel of the two first channels. A generation unit generates a management frame indicating the BSS operational mode selected by the BSS mode selection unit. A transmission unit transmits the management frame.