Satellite Cell Reference Position Signaling for Low-Overhead Reselection
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Solution Overview
Problem
In non-terrestrial networks, the changing coverage area of cells due to satellite movement poses challenges for terminal devices in determining accurate reference positions, particularly in RRC idle or inactive states, leading to increased signaling overheads and computational burdens during cell selection/reselection.
Innovation Solution
The method involves the base station sending first information to indicate continuous reference positions of a cell over a time period, using a model and parameters to allow the terminal device to determine the reference position without frequent updates, reducing signaling overheads and computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station frequently updates reference position information to satellite-moving cells, then the accuracy of cell reference positions is improved, but the signaling overhead increases
Solution Approach 1:
The base station pre-calculates and provides reference position information for multiple future time points in advance, rather than updating frequently in real-time. This allows terminal devices to obtain accurate reference positions for future cell reselection without requiring continuous signaling updates, thereby reducing signaling overhead while maintaining position accuracy.
Solution Approach 2:
The patent introduces a dynamic reference position indication mechanism that adapts to satellite movement. The base station determines reference positions at different time points based on satellite trajectory, and provides these dynamic reference positions to terminal devices through downlink signaling, enabling accurate cell reselection without frequent updates.
2Measurement precision
If the terminal device calculates reference positions in real-time, then the accuracy is improved, but the computational burden increases
Solution Approach 1:
The base station acts as an intermediary that performs the complex calculation of reference positions based on satellite movement. Instead of requiring terminal devices to calculate reference positions themselves, the base station computes these positions and provides them directly to terminal devices through downlink signaling, thereby reducing computational burden on terminal devices while maintaining accuracy.
Solution Approach 2:
The terminal device uses the provided reference position information and simple time-based interpolation to determine reference positions at any given time, rather than performing complex real-time calculations. This self-service approach using pre-provided data reduces computational requirements while maintaining determination accuracy.
3Loss of time
If the base station updates reference position information at high frequency, then the timeliness is improved, but the signaling overhead increases
Solution Approach 1:
The base station provides reference position information for multiple future time points in advance through periodic updates. This preliminary provision of future reference positions ensures timeliness for cell reselection decisions without requiring high-frequency continuous updates, thereby reducing signaling overhead while maintaining information freshness.
Data Source
AI summary
A method and apparatus for wireless communication are provided. One example method includes: receiving first information, wherein the first information indicates continuous reference positions of a first cell in a first time period, and a coverage area of the first cell changes with movement of a satellite, wherein the first information includes first parameters, and the first parameters are used to determine trail information of reference positions of the first cell.