Non-terrestrial network cell selection using distance thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cell selection techniques in non-terrestrial networks face challenges such as increased battery consumption, signaling overhead, and frequent radio link failures due to small changes in RSRP values and low signal-to-interference-plus-noise ratio.
Innovation Solution
A method and apparatus for cell selection in non-terrestrial networks that adjust distance thresholds based on the shape and altitude of cells, using ephemeris information and GNSS signals to calculate the location of terminals and configure reference lines and virtual lines for accurate measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement-based handover methods are implemented in non-terrestrial networks, then handover capability is provided, but battery consumption increases and signaling overhead increases due to small changes in RSRP values
Solution Approach 1:
The patent changes the handover determination parameter from RSRP value to distance value. The terminal calculates distance to the satellite based on ephemeris information and compares it with a distance threshold, rather than measuring RSRP values. This parameter change eliminates the problem of small RSRP changes causing excessive handovers and battery consumption.
Solution Approach 2:
The patent extracts the distance calculation function from the traditional RSRP-based handover mechanism. By using ephemeris information to directly calculate terminal-satellite distance, the system removes the need for continuous RSRP measurement and reporting, thereby reducing battery consumption and signaling overhead while maintaining handover capability.
2Reliability
If measurement-based handover methods are implemented in non-terrestrial networks, then handover capability is provided, but signaling overhead increases due to small changes in RSRP values
Solution Approach 1:
The patent changes the handover determination parameter from RSRP value to distance value. The terminal calculates distance to the satellite based on ephemeris information and compares it with a distance threshold, rather than measuring RSRP values. This parameter change eliminates the problem of small RSRP changes causing excessive handovers and battery consumption.
Solution Approach 2:
The patent extracts the distance calculation function from the traditional RSRP-based handover mechanism. By using ephemeris information to directly calculate terminal-satellite distance, the system removes the need for continuous RSRP measurement and reporting, thereby reducing battery consumption and signaling overhead while maintaining handover capability.
3Device complexity
If traditional cell selection is used in non-terrestrial networks, then simplicity is maintained, but radio link failures occur frequently due to small changes in RSRP values and low SINR
Solution Approach 1:
The patent changes the cell selection parameter from RSRP value to distance value. The terminal calculates distance to the satellite based on ephemeris information and compares it with a distance threshold, rather than measuring RSRP values. This parameter change eliminates the problem of small RSRP changes causing excessive handovers and battery consumption.
Data Source
AI summary
A method of a terminal may comprise: calculating a first adjusted distance threshold by adjusting a first reference distance threshold of a serving cell, based on information on a first reference location of the serving cell, ephemeris information of a satellite, and a location of the terminal; calculating a second adjusted distance threshold by adjusting a second reference distance threshold of a neighbor cell, based on information on a second reference location of the neighbor cell, the ephemeris information, and the location of the terminal; performing a distance-based measurement reporting process by applying the first adjusted distance threshold and the second adjusted distance threshold; and selecting a cell through the distance-based measurement reporting process.