Group Ephemeris Data Provision for Satellite Mobility
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Solution Overview
Problem
The existing methods for providing ephemeris data in satellite-based mobile networks result in large data sizes and high power consumption for User Equipment (UE), making it challenging to manage mobility and perform handovers efficiently.
Innovation Solution
The proposed solution involves using satellite group IDs to represent groups of satellites, allowing the UE to compare received satellite group IDs with stored IDs to determine if the ephemeris data is already available, thereby reducing the need for continuous data reception and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full ephemeris data from satellites is provided to UE, then measurement and handover accuracy is improved, but data size and power consumption increase significantly
Solution Approach 1:
The patent extracts only the essential elements of ephemeris data (orbital plane parameters) while removing redundant satellite-level parameters. This allows the UE to perform measurements and handovers with sufficient accuracy without processing the complete ephemeris data set, thereby reducing data size while maintaining handover accuracy.
Solution Approach 2:
The ephemeris data is segmented into two parts: orbital plane parameters (provided to UE) and satellite-level parameters (retained at network side). This segmentation enables the UE to handle only the essential orbital information needed for measurements and handovers, reducing the data burden while preserving measurement precision.
2Measurement precision
If complete ephemeris data is processed by UE, then cell searching and measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the orbital plane parameters from the complete ephemeris data and provides them to the UE. This extraction enables the UE to perform cell searching and measurements with sufficient accuracy without processing the full data set, thereby reducing power consumption while maintaining measurement precision.
3Measurement precision
If detailed ephemeris data is provided, then satellite tracking precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and provides only the orbital plane parameters to the UE, which are sufficient for satellite tracking purposes. This reduces the complexity of UE processing while maintaining tracking precision by eliminating the need to handle detailed satellite-level parameters.
Solution Approach 2:
Instead of providing complete ephemeris data and expecting the UE to process it, the patent inverts the approach by providing only the essential orbital plane parameters and having the network side retain the detailed satellite-level parameters. This inversion reduces UE complexity while preserving tracking precision.
Data Source
AI summary
The present application relates to a method and an apparatus for a group ephemeris data provision. One embodiment of the subject application provides a method performed by a User Equipment (UE), which includes: receiving a signal indicating a first satellite group ID of a first satellite group; and comparing the first satellite group ID with a second satellite group ID of a second satellite group in a second satellite group ID set which is previously stored in the UE, wherein the first satellite group ID is associated with group ephemeris data and each satellite group ID of the second satellite group ID is associated with group ephemeris data.