ATG Terminal Time-Frequency Compensation for Doppler Delay
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Solution Overview
Problem
Air-to-ground (ATG) terminals face challenges in maintaining communication reliability due to large propagation delays and Doppler shifts caused by high-speed movement, which existing methods struggle to address effectively.
Innovation Solution
The ATG terminal receives indication information from a network device, including location and scheduling offset information, enabling autonomous time and frequency compensation to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ATG terminal uses existing communication methods, then the system complexity is low, but communication reliability deteriorates due to large propagation delays and Doppler shifts
Solution Approach 1:
The network device pre-calculates and provides timing advance information to the ATG terminal before communication occurs. This allows the terminal to perform time synchronization in advance, compensating for propagation delays and maintaining communication reliability without adding complex real-time adjustment mechanisms.
Solution Approach 2:
The patent introduces timing advance information as an intermediary parameter that mediates between the network device and ATG terminal. This information carrier conveys synchronization data, enabling the terminal to adjust its timing without direct complex control loops, thus improving reliability while keeping system complexity manageable.
2Reliability
If the ATG terminal performs autonomous time and frequency compensation, then communication reliability improves, but the device complexity increases
Solution Approach 1:
The ATG terminal autonomously performs time and frequency compensation using the provided timing advance information without requiring complex network-side control. The terminal independently adjusts its transmission timing and frequency based on local calculations, reducing network complexity while maintaining reliability.
Solution Approach 2:
The patent changes the timing and frequency parameters of the ATG terminal based on the provided timing advance information. By adjusting these parameters autonomously, the terminal compensates for propagation delays and Doppler shifts, improving communication reliability without requiring complex external control systems.
3Measurement precision
If the network device provides detailed location and scheduling information, then the ATG terminal can perform precise compensation, but the information overhead increases
Solution Approach 1:
The patent extracts only the essential timing advance information needed for compensation from the complete location and scheduling data. Instead of transmitting all detailed parameters, the network device provides a condensed timing advance value that contains the critical synchronization data, reducing information overhead while maintaining compensation precision.
Solution Approach 2:
The network device pre-processes location and scheduling information to generate timing advance values before transmission. This preliminary processing condenses complex data into essential synchronization parameters, allowing the ATG terminal to perform precise compensation with minimal information overhead.
Data Source
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AI summary
Disclosed in the embodiments of the present disclosure are an information acquisition method and apparatus, which can be applied to the technical field of communications. The method, which is executed by an ATG terminal device, comprises: receiving indication information sent by a network-side device, wherein the indication information comprises at least one piece of the following pieces of information: first position information of a serving cell, second position information of a neighbor cell, and scheduling offset information, By means of the method, an ATG terminal device can acquire at least one piece of the following pieces of information: first position information of a serving cell, second position information of a neighbor cell, and scheduling offset information, such that time-frequency compensation is autonomously performed, thereby guaranteeing the reliability of communication.