Wireless Terminal Synchronization Value Determination for NTN Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially in non-terrestrial networks and high-speed terrestrial scenarios, traditional methods for handling Doppler shift and transmission delay are inadequate due to large round-trip times and fast-changing channel characteristics, leading to inaccuracies in time information estimation.
Innovation Solution
The method involves determining synchronization values based on multiple time stamps, which are bundled into bursts and transmitted to wireless network nodes, allowing for precise estimation of timing advance and Doppler shift through type-A and type-B time information, with different burst types and transmission channels used to manage estimation errors and signaling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional random access procedure is used in NTN, then the system can cover devices in remote areas, but the large Doppler shift and transmission delay cannot be handled effectively
Solution Approach 1:
The patent segments time information into two distinct types: type-A time information (coarse time stamp indicating absolute time with lower precision) and type-B time information (fine time stamp indicating relative time with higher precision). This segmentation allows the system to handle both the large transmission delay inherent in NTN and the need for precise Doppler shift estimation, resolving the contradiction between coverage reliability and measurement precision.
2Measurement precision
If single time stamp is used for time information indication, then the signaling overhead is reduced, but the transmission delay and Doppler shift estimation deviate from real situations in NTN and high speed scenarios
Solution Approach 1:
The patent adds a temporal dimension to time information indication by introducing multiple time stamps with different resolutions (type-A and type-B) rather than using a single time stamp. This dimensional expansion enables accurate estimation of both long-term transmission delay and short-term Doppler shift variations, achieving high measurement precision while maintaining manageable system complexity through standardized burst structures.
3Measurement precision
If multiple time stamps with different resolutions are used, then the accuracy of Doppler shift and transmission delay estimation is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies local quality by assigning different precision levels to different time information needs: type-A time information provides coarse absolute time for general synchronization, while type-B time information provides fine relative time for precise Doppler shift estimation. This localized precision allocation achieves high overall accuracy while minimizing signaling overhead compared to using high-precision time stamps for all purposes.
Data Source
AI summary
A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises determining at least one synchronization value based on at least one time stamp, and transmitting, to a wireless network node, a signal based on the at least one synchronization value.