Wireless Access Point Power Control for WLAN Interference
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Solution Overview
Problem
Current wireless local area networks (WLANs) face challenges in efficiently managing power levels at which mobile devices transmit, leading to reduced battery life, congestion, and interference due to fixed high power settings and inefficient roaming processes.
Innovation Solution
Implementing a method where wireless access points control the transmit power levels of mobile devices through control signals, allowing for adjustable power settings based on the specific requirements of each coverage area, ensuring mobile devices transmit at optimized power levels matching or not exceeding the access point's power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If mobile devices transmit at high power levels, then transmission range is improved, but battery life is reduced and interference increases
Solution Approach 1:
The patent implements dynamic power control where the mobile device adjusts its transmit power level based on real-time conditions including distance to access point, signal strength, and network congestion. The power level is not fixed but dynamically optimized during the communication session to balance transmission range requirements with battery conservation.
Solution Approach 2:
The system changes the power level parameter adaptively based on multiple factors including signal quality metrics, distance measurements, and network conditions. The access point receives feedback about transmission quality and adjusts the authorized power level accordingly, transforming a static parameter into a dynamic one that optimizes performance.
2Length of moving object
If mobile devices transmit at high power levels, then transmission range is improved, but interference with access point transmissions increases
Solution Approach 1:
The patent implements a feedback mechanism where the mobile device reports transmission quality and signal strength to the access point. Based on this feedback, the access point adjusts the authorized power level for the mobile device, creating a closed-loop control system that optimizes power levels to minimize interference while maintaining connectivity.
Solution Approach 2:
The system performs preliminary measurements of signal strength and distance before allowing high power transmission. The access point pre-calculates appropriate power levels based on the current situation, preventing interference before it occurs rather than reacting to interference problems after they arise.
3Ease of operation
If fixed high power level is used, then ease of operation is improved, but power efficiency is reduced
Solution Approach 1:
The system performs self-service optimization where the mobile device and access point automatically adjust power levels without user intervention. The device monitors its own transmission quality and battery status, while the access point manages network conditions, creating an autonomous power optimization system that eliminates the need for manual power setting while improving efficiency.
4Area of stationary object
If multiple wireless coverage areas are deployed, then geographic coverage is improved, but channel interference between areas increases
Solution Approach 1:
The patent applies local quality optimization by allowing each wireless coverage area to have customized power control parameters based on its specific conditions. Each access point can independently adjust the power levels of associated mobile devices according to local factors such as distance between coverage areas, signal propagation characteristics, and interference patterns, optimizing performance for each local environment.
Data Source
AI summary
A mobile device for wireless communication with a wireless local area network (WLAN) includes a transceiver that is able to selectively transmit at a plurality of transmit power levels. When the mobile device associates with a wireless access point in the WLAN, the wireless access point transmits a control signal that controls the power level at which the mobile device transmits wireless signals to that wireless access point.