Satellite Base Station Power Back-Off for Interference Control
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Solution Overview
Problem
The integration of satellite communication systems with 5G networks leads to increased out-of-band leakage and in-band carrier interference due to the non-linear impact of power amplifiers in satellite base stations, necessitating power back-off to mitigate inter-cell interference and improve cell throughput.
Innovation Solution
A power adjustment method where terminal devices determine large-scale loss differences and communicate them to access network devices, allowing the devices to calculate power back-off values based on ephemeris, beam direction, weather, and geographical information, enabling precise power adjustments to reduce out-of-band leakage and improve in-band signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifier operates at high power in satellite base station, then output power is improved, but out-of-band leakage and in-band carrier interference increase
Solution Approach 1:
The patent applies preliminary action by having the terminal device calculate and report the large-scale loss difference before the network device performs power adjustment. The terminal device proactively provides the power back-off value based on channel conditions, allowing the network device to adjust output power in advance to avoid interference issues
Solution Approach 2:
The patent implements feedback by having the terminal device measure channel conditions, calculate the large-scale loss difference, and report this information back to the network device. The network device then uses this feedback to adjust the power amplifier's output power, creating a closed-loop control system that reduces out-of-band leakage and in-band interference
2Object-generated harmful factors
If power back-off is applied to reduce interference, then out-of-band leakage is reduced, but cell throughput decreases
Solution Approach 1:
The patent applies dynamics by making the power back-off value dynamic rather than fixed. The terminal device calculates the large-scale loss difference based on current channel conditions, and the network device adjusts power accordingly. This dynamic adjustment allows the system to optimize the balance between reducing out-of-band leakage and maintaining cell throughput based on real-time conditions
3Measurement precision
If terminal device measures downlink signal to determine power adjustment, then accuracy of power adjustment is improved, but power consumption of terminal device increases
Solution Approach 1:
The patent extracts only the essential information needed for power adjustment - the large-scale loss difference - rather than requiring the terminal device to perform full signal measurements. The terminal device calculates this specific parameter based on available channel state information and reports it to the network device, reducing power consumption while maintaining sufficient accuracy for power adjustment
Data Source
AI summary
Embodiments of this disclosure provide a power adjustment method, apparatus, and system. A first access network device may obtain a power back-off value at a first moment, and compare the power back-off value at the first moment with a power back-off value at a second moment. The second moment is earlier than the first moment. When a difference between the power back-off value at the second moment and the power back-off value at the first moment is greater than or equal to a first threshold, the first access network device adjusts an output power based on the power back-off value at the first moment.