Satellite Ephemeris Parameter Reduction for Low-Latency Communication
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Solution Overview
Problem
Conventional satellite communication systems face high signaling overheads and latency in obtaining ephemeris information due to the need for continuous monitoring of navigation messages, which is inefficient for non-terrestrial networks.
Innovation Solution
A method and apparatus that utilize a reduced set of ephemeris parameters, defaulting some parameters based on gravitational laws and reference points, and employing relative values to minimize signaling overheads and latency in determining satellite location and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete ephemeris information (all 6 parameters) is transmitted, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and transmits only the necessary subset of ephemeris parameters (m parameters where m < 6) instead of all parameters. The terminal device can derive the remaining parameters through calculations using the transmitted parameters and gravitational laws, thereby reducing signaling overhead while maintaining positioning accuracy.
Solution Approach 2:
The terminal device performs self-service by calculating the remaining ephemeris parameters itself using the transmitted parameters and gravitational laws. This eliminates the need for the network to transmit all parameters, reducing signaling overhead while the terminal maintains full positioning capability through its own computations.
2Measurement precision
If complete ephemeris information is obtained through continuous monitoring, then accuracy is improved, but time consumption increases
Solution Approach 1:
The network device pre-processes and transmits the essential ephemeris parameters to the terminal device. This preliminary action allows the terminal to quickly obtain the necessary information without needing to continuously monitor navigation messages for extended periods, thereby reducing time consumption while maintaining accuracy.
Solution Approach 2:
The patent extracts the most critical ephemeris parameters for transmission and allows the terminal to derive remaining parameters through calculations. This extraction approach enables the terminal to obtain complete ephemeris information faster than continuous monitoring would allow, reducing time consumption while preserving accuracy.
3Quantity of substance
If a reduced set of ephemeris parameters is used, then signaling overhead is reduced, but system complexity increases
Solution Approach 1:
The terminal device performs self-service calculations to derive complete ephemeris information from the reduced parameter set. While this adds computational complexity at the terminal, it avoids the need for complex network-side processing and parameter management, effectively distributing the complexity to where it is most efficiently handled.
Solution Approach 2:
Gravitational laws serve as an intermediary that enables the terminal to calculate missing ephemeris parameters from the transmitted subset. This physical law acts as a mediator that bridges the gap between reduced signaling and complete information availability, managing the complexity through well-established scientific principles.
Data Source
AI summary
A first communication apparatus obtains first ephemeris information of a second communication apparatus, where the first ephemeris information includes information about m parameters of n parameters in second ephemeris information, n is equal to 6, and m is a positive integer less than n, and the n parameters include a first location parameter, a first location parameter, and a first location parameter in first location information, and a first velocity parameter, a first velocity parameter, and a first velocity parameter in first velocity information. The first communication apparatus determines values of the n parameters in the second ephemeris information based on the first ephemeris information, where the values of the n parameters include values of the m parameters and values of remaining n−m parameters. The first communication apparatus communicates with the second communication apparatus based on the second ephemeris information.