Satellite Base Station Handover Using Pitch Angle Detection
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Solution Overview
Problem
The existing method for satellite base station handover in low-orbit satellite communication systems is inaccurate due to the difficulty in obtaining downlink signals simultaneously and the low change in received signal strength, making it challenging to achieve seamless handovers in high-frequency bands.
Innovation Solution
A handover method that determines the pitch angle of a terminal's antenna relative to the ground horizontal line and performs inter-satellite handover when the pitch angle is within a preset range, using either measured angles or indication information from the satellite base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSSI-based handover decision is used, then handover can be performed, but the handover accuracy is insufficient due to low signal strength change in high frequency bands
Solution Approach 1:
The patent changes the handover decision parameter from RSSI (signal strength) to pitch angle (antenna orientation). This parameter substitution resolves the contradiction because pitch angle exhibits significant changes during handover in high frequency bands, whereas RSSI shows minimal variation, enabling accurate handover detection.
2Measurement precision
If downlink signals of multiple cells are obtained simultaneously for handover decision, then handover accuracy improves, but system complexity and cost increase
Solution Approach 1:
The patent extracts the pitch angle parameter from the complex multi-signal acquisition process. Instead of requiring simultaneous downlink signals from multiple cells, the system only needs to acquire the pitch angle from the current serving cell, dramatically simplifying the system while maintaining handover decision accuracy.
Solution Approach 2:
The pitch angle acts as an intermediary parameter that indirectly reflects the handover state without requiring direct measurement of multiple downlink signals. This intermediary approach simplifies the measurement system while preserving handover detection capability.
3Productivity
If pitch angle measurement is used for handover decision, then handover speed and accuracy improve, but additional antenna orientation measurement capability is required
Solution Approach 1:
The terminal uses its own antenna orientation information (pitch angle) that is inherently available during normal operation to make handover decisions. This self-service approach eliminates the need for additional external measurement systems while enabling fast and accurate handovers.
Data Source
AI summary
A method for handover of a satellite base station, a terminal, the satellite base station, and a storage medium are provided. The terminal determines a pitch angle when accessing the satellite base station; and if the pitch angle is determined within a preset range, the terminal performs inter-satellite handover; or the terminal sends the pitch angle to the accessed satellite base station, so that the satellite base station notifies the terminal to perform the inter-satellite handover when determining that the pitch angle is within the preset range.