Satellite Communication Doppler Compensation via Network Intermediary
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN) of the 5G mobile communication system, the high-speed movement of satellites causes significant Doppler effects, leading to signal time compression or stretching, which degrades time accuracy and imposes a computational burden on terminal devices requiring advanced timing and positioning capabilities for time compensation.
Innovation Solution
A communication method and apparatus that receive a Doppler parameter to determine a time compensation amount for signals, reducing the burden on terminal or network devices by allowing them to adjust signal time lengths or timing advances based on satellite motion, thereby compensating for Doppler effects without local calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device estimates the change value of signal time length based on satellite orbit information, then the time accuracy of the signal is improved, but the device complexity and computational burden increase significantly
Solution Approach 1:
The patent introduces a network device as an intermediary that performs the complex Doppler parameter calculations and time compensation operations. The network device receives orbit information, calculates the Doppler effect parameters, and provides compensation values to terminal devices, thereby relieving the computational burden from terminals while maintaining signal time accuracy
Solution Approach 2:
The patent extracts the complex calculation functions from the terminal device and relocates them to the network device. The terminal device only needs to receive pre-calculated Doppler parameters and apply simple time compensation, while the network device handles the computationally intensive orbit information processing and parameter derivation
2Measurement precision
If the terminal device performs time compensation using orbit information, then the signal time accuracy is improved, but the terminal device requires advanced timing and positioning capabilities which increases operational complexity
Solution Approach 1:
The network device performs self-service by autonomously calculating the Doppler parameters and time compensation values based on satellite orbit information. The terminal device simply receives these pre-processed parameters and applies them without needing to perform complex calculations or possess advanced timing and positioning capabilities
Solution Approach 2:
The network device acts as an intermediary that translates complex orbit information into simple time compensation parameters. This intermediary function shields the terminal device from operational complexity while ensuring accurate time compensation is applied
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the adverse impact of Doppler effects on signal time accuracy, enhancing communication reliability by distributing the computational load and ensuring accurate signal transmission without the need for advanced timing capabilities at the terminal devices.
Implementation Method 1
the signal received by the receiver in the NTN will have a strong Doppler effect, i.e., the time length of the signal received by the receiver will be compressed or stretched when compared with the time length of the signal transmitted by the transmitter
Data Source
AI summary
The present disclosure provides a communication method, including: receiving a Doppler parameter; and determining a time compensation amount for a signal based on the Doppler parameter. When the method is performed by a terminal device, the terminal device can receive the Doppler parameter from a satellite or a satellite measurement and control center. When the method is performed by a satellite, the satellite can receive the Doppler parameter from a satellite measurement and control center. Therefore, the apparatus performing the method does not need to calculate the Doppler parameter locally, thereby reducing the burden on the apparatus.