Satellite Base Station Data Broadcasting Method Reducing Bit Overheads
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Solution Overview
Problem
In satellite communications, the direct broadcasting of data such as Doppler frequency shift compensation values and timing advances by a satellite base station results in high bit overheads, occupying significant physical resources.
Innovation Solution
The satellite base station determines reference data and calculates differences between data sets for each beam, broadcasting only the reference data and differences, which requires fewer bits than directly representing all data, thereby reducing physical resource overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the satellite base station directly broadcasts all data for each beam, then the terminal device can obtain complete information, but the bit overheads are very high and occupy a large amount of physical resources
Solution Approach 1:
The patent extracts only the essential information (reference data and differences) from the complete beam data set and transmits it to the terminal. The terminal then reconstructs the complete information locally using the received reference data and difference values, thereby reducing transmitted bit overheads while maintaining data transmission completeness.
Solution Approach 2:
The patent segments the beam data into a reference data portion (common to all beams) and difference data portions (specific to each beam). This segmentation allows the terminal to efficiently reconstruct complete beam information by combining the reference data with the smaller difference values, reducing overall bit overheads.
2Quantity of substance
If the satellite base station broadcasts reference data and differences instead of all data, then the bit overheads are reduced, but the system must perform additional processing to calculate differences
Solution Approach 1:
The patent performs preliminary sorting of beam data in ascending or descending order before calculating differences. This preliminary action ensures that the differences between adjacent beams are minimized, which reduces the number of bits required to represent the difference values and further reduces bit overheads.
Solution Approach 2:
The patent creates a simplified copy of the complete data set in the form of reference data and difference values. This copy contains all necessary information for reconstruction but uses fewer bits, effectively trading processing complexity for reduced transmission overhead.
3Quantity of substance
If the beam data is sorted before broadcasting differences, then the differences between adjacent beams are smaller and require fewer bits, but additional sorting processing is required
Solution Approach 1:
The patent changes the order parameter of beam data by sorting it in ascending or descending order before calculating differences. This parameter change ensures that adjacent beams have similar characteristics, minimizing the difference values and reducing the bits required for their representation.
Data Source
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AI summary
This application provides a data broadcast method, used in a satellite communications system, to reduce physical resource overheads generated when a satellite base station broadcasts data. The method includes: The satellite base station obtains a plurality of pieces of data that need to be broadcast, where the plurality of pieces of data are a same type of data of compensation values of Doppler frequency shifts, change rates of Doppler frequency shifts, transmission delays, change rates of transmission delays, timing advances TAs, change rates of TAs, and angles of a plurality of beams that respectively correspond to the plurality of beams generated by the satellite base station. The satellite base station determines reference data and a difference between each piece of data in the plurality of pieces of data and the reference data based on the plurality of pieces of data. The satellite base station sends first indication information and a plurality of pieces of second indication information to a terminal device, where the first indication information is used to indicate the reference data, and each piece of second indication information is used to indicate a difference between one piece of data in the plurality of pieces of data and the reference data.