Satellite IoT Uplink Power Control Using Orbit-Based Distance
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Solution Overview
Problem
In satellite IoT systems using low earth orbit satellites, power consumption is wasteful due to constant high transmission output regardless of the distance between IoT terminals and the satellite, especially when the distance is short.
Innovation Solution
A wireless communication device and system that adjusts transmission output based on the positional relationship between the IoT terminal and the moving relay satellite, using orbit and self-position information to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant high transmission output is used to ensure reliable communication with the satellite, then communication reliability is improved, but power consumption increases unnecessarily when the distance is short
Solution Approach 1:
The transmission output is made dynamic rather than constant. The wireless communication device adjusts the transmission output based on the calculated distance to the satellite, using higher output when far away and lower output when close, thereby maintaining communication reliability while reducing unnecessary power consumption.
Solution Approach 2:
The transmission output parameter is changed based on distance conditions. The device calculates the distance to the satellite and adjusts the transmission output parameter accordingly, transitioning between different output levels to optimize the balance between communication reliability and power consumption.
2Reliability
If a high transmission output is used to ensure signal reaches the satellite, then communication quality is improved, but energy is wasted when the distance is short
Solution Approach 1:
Instead of always using excessive transmission output, the device applies partial action by adjusting the output level to match the actual distance requirements. When the satellite is close, a lower (partial) output suffices, reducing energy waste while maintaining adequate communication quality.
Solution Approach 2:
The system uses feedback by calculating the distance to the satellite and using this information to adjust the transmission output. This feedback mechanism ensures that the transmission output is optimized based on actual conditions, preventing energy waste while maintaining communication quality.
3Device complexity
If constant transmission output is used regardless of distance, then device configuration is simplified, but power consumption is inefficient
Solution Approach 1:
The transmission output parameter is dynamically changed based on distance calculations. The device computes the distance to the satellite and adjusts the transmission output parameter accordingly, achieving efficient power consumption with moderate increases in device complexity through the addition of distance calculation and control functions.
Data Source
AI summary
A wireless communication device includes: a transmission unit that transmits a signal to another wireless communication device mounted on a moving object; a timing control unit that starts transmission of the signal by the transmission unit at a timing at which communication with the other wireless communication device is possible; a distance calculation unit that acquires orbit information indicating a geocentric orbit of the moving object and self-position information indicating a self-position to calculate a positional relationship between the self-position and a position of the moving object at the timing based on the orbit information and the self-position information; and an output control unit that controls a transmission output of the signal by the transmission unit according to the positional relationship.