NTN Timing Offset Determination for Satellite Communication Reliability
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Solution Overview
Problem
The reliability of data interaction in satellite communication scenarios is compromised due to the high-speed movement of satellites, making it challenging to achieve effective timing alignment for uplink and downlink transmissions.
Innovation Solution
A communication method is introduced where a network device in a non-terrestrial network (NTN) sends first information containing timing range information and indication information to user equipment (UE), allowing the UE to determine a suitable time offset for timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite communication is used to extend coverage and support emergency communication, then coverage range and reliability are improved, but timing alignment accuracy deteriorates due to high-speed satellite movement
Solution Approach 1:
The network device pre-calculates multiple candidate time offsets corresponding to different satellite positions and transmits them to the UE in advance. The UE receives these candidate values before actual communication occurs and selects the appropriate one based on current satellite position information, thereby compensating for timing errors caused by satellite movement without requiring real-time adjustment
Solution Approach 2:
The patent introduces a dynamic time offset selection mechanism where the UE determines the appropriate time offset based on the current satellite position. The system transitions from a static timing approach to a dynamic one that adapts to satellite movement, allowing the timing parameters to change according to the satellite's real-time position while maintaining synchronization
2Device complexity
If a fixed time offset is used for timing alignment, then device complexity is reduced, but timing alignment accuracy deteriorates due to satellite position changes
Solution Approach 1:
The patent divides the time offset parameter into multiple discrete candidate values, each corresponding to a specific satellite position range. Instead of requiring continuous real-time calculation, the system segments the timing adjustment into predefined steps, reducing computational complexity while maintaining adequate accuracy for different satellite positions
Solution Approach 2:
The system changes the time offset parameter based on satellite position information. The network device provides multiple candidate time offset values, and the UE selects the appropriate parameter value according to current satellite position, thereby adapting timing parameters to environmental changes without requiring complex real-time calculation algorithms
Data Source
AI summary
A communication method is performed by a network device in a non-terrestrial network (NTN). The method includes: sending first information, wherein the first information comprises: timing range information and first indication information; wherein the timing range information is configured to indicate a timing range for a time offset; and the first indication information is configured to indicate the time offset determined from the timing range.