Wireless Node Power Control for Hidden Node Avoidance
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Solution Overview
Problem
In wireless networks, reducing transmission power to conserve energy can lead to 'hidden node' issues, where devices become undetectable and may interfere with other network communications, affecting network behavior.
Innovation Solution
A method for wireless nodes to determine proximity to an access point and transmit a message frame at a higher power to protect subsequent data frames, followed by reducing power for subsequent data transmissions while assessing the likelihood of becoming a hidden node, and only doing so if the likelihood is low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If output power is reduced to conserve energy, then power consumption is improved, but transmission range deteriorates
Solution Approach 1:
The patent applies dynamic power adjustment by transitioning from static full-power transmission to adaptive power control. The system dynamically selects between full power and reduced power modes based on real-time conditions including distance to access point, signal strength measurements, and network traffic analysis, thereby optimizing the balance between power consumption and transmission range.
Solution Approach 2:
The patent changes the transmission power parameter from a fixed value to a variable parameter that adapts to different operational conditions. By monitoring signal strength, distance, and network load, the system adjusts the power parameter to achieve optimal performance, reducing power when distance is short and maintaining full power when needed for long-range communication.
2Use of energy by moving object
If output power is reduced for short transmission distances, then power consumption is improved, but hidden node problems worsen
Solution Approach 1:
The patent performs preliminary actions by measuring signal strength and assessing transmission conditions before reducing power. The system evaluates factors such as distance to access point, received signal strength indicators, and channel traffic levels in advance to determine whether power reduction is safe, preventing hidden node issues before they occur.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors network conditions, signal strength, and transmission success rates. Based on this feedback, the system adjusts power levels dynamically, increasing power when hidden node problems are detected and maintaining reduced power when conditions remain stable, thus ensuring network reliability.
3Use of energy by moving object
If transmission power is reduced, then power consumption is improved, but detection capability by other nodes deteriorates
Solution Approach 1:
The patent makes detectability dynamic by adjusting transmission power based on real-time network conditions. The system dynamically switches between high-power and low-power modes, using high power when detectability is crucial and low power when conditions permit, thereby optimizing the balance between energy efficiency and node detectability.
Solution Approach 2:
The patent changes the transmission power parameter adaptively, using higher power levels when other nodes need to detect the transmission and lower power levels when detectability is not critical. This parameter adjustment is based on monitored factors such as channel traffic, distance, and network load, enabling flexible optimization of detectability versus power consumption.
Data Source
AI summary
Embodiments of the present disclosure provide techniques for reducing power consumption by wireless devices through transmission output power control.