Mobile Station Rain Detection Modulation Control
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Solution Overview
Problem
In wireless communication systems with mobile stations, existing methods for adapting modulation systems to changing reception power due to fading fluctuations caused by movement can lead to premature reduction in transmission speed when the low reception power period is short, resulting in suboptimal communication distance maintenance.
Innovation Solution
A mobile station equipped with a distance calculation unit, reception power measurement unit, and transmission-path state determination unit that selects communication parameters based on transmission-path quality, using a first parameter for clear weather and a second parameter for rainy weather to maintain communication distance while preventing reduction in transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the modulation system is changed based on reception power in mobile wireless communication, then communication distance can be maintained during fading, but transmission speed is reduced when the low reception power period is shorter than control delay
Solution Approach 1:
The system performs preliminary classification of reception power fluctuation causes by comparing current reception power with historical data and transmission power levels. This preliminary action distinguishes between fading-induced fluctuations and rain-induced attenuation, enabling the system to take different actions: no modulation change for fading (maintaining transmission speed) and appropriate changes for rain (maintaining communication distance).
Solution Approach 2:
The invention applies different parameter selection strategies based on the local condition of reception power fluctuation cause. When fading is detected, the system maintains the current modulation system locally. When rain is detected, the system switches to a more robust modulation system locally. This localized quality adaptation resolves the contradiction by applying the right solution to the right condition.
2Reliability
If a modulation system with smaller multi-level number is selected to maintain communication during rain, then communication distance is maintained, but transmission speed decreases
Solution Approach 1:
The system dynamically changes communication parameters (modulation system, coding rate) based on detected rain conditions. When rain is detected through reception power analysis, the system transitions to parameters optimized for rainy conditions (smaller multi-level number). When no rain is detected, the system uses parameters optimized for clear conditions (larger multi-level number for higher speed), thus resolving the speed-distance trade-off through conditional parameter adaptation.
Solution Approach 2:
The invention implements dynamic parameter selection that adapts to changing environmental conditions. The system continuously monitors reception power and dynamically adjusts modulation parameters based on whether rain or fading is detected. This dynamic adaptation allows the system to optimize for speed in clear conditions and for distance in rainy conditions, eliminating the need for permanent speed reduction.
3Reliability
If communication parameters are frequently adjusted to adapt to fading fluctuations, then reception power variations are compensated, but control complexity and delay increase
Solution Approach 1:
The system performs preliminary classification of reception power fluctuation causes before initiating parameter changes. By comparing current reception power with historical data and transmission power levels, the system pre-identifies whether fluctuations are due to fading or rain. This preliminary action prevents unnecessary parameter adjustments for fading, reducing control complexity while maintaining compensation for actual rain-induced attenuation.
Solution Approach 2:
The invention extracts and separates the fading component from reception power variations by comparing with historical data and transmission power. This extraction allows the system to isolate and respond only to rain-induced attenuation, removing the need for complex continuous adjustment mechanisms and reducing control processing complexity while maintaining effective compensation.
Data Source
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AI summary
A mobile station that communicates with a base station includes, a distance calculation unit 25 that calculates the distance between the mobile station and the base station, a reception power measurement unit 23 that measures a reception power of a reception signal received from the base station; a rain state determination unit 24 that determines a transmission-path quality on the basis of a reception-power theoretical value corresponding to the distance and a reception power measured by the reception power measurement unit 23 and selects a communication parameter on the basis of the determined transmission-path quality, and a modulation unit 22 that generates a transmission signal to be transmitted to the base station by using a communication parameter.