NTN Location Parameters for Accurate Timing Advance
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Solution Overview
Problem
In non-terrestrial networks (NTN), the dynamic change in the location of NTN devices leads to fluctuations in the distance between terminal devices and NTN devices, necessitating a corresponding change in timing advance (TA), which current methods struggle to accurately determine.
Innovation Solution
The network device sends system information to the terminal device, including a location parameter of the NTN device with associated time information, allowing the terminal device to calculate a precise timing advance by considering the NTN's location and motion parameters at the time of uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the location parameter of NTN device is updated frequently to maintain timing advance accuracy, then the timing advance determination accuracy is improved, but the system information overhead and signaling complexity increase
Solution Approach 1:
The network device pre-calculates and provides timing advance offset values for multiple future time points in advance. The terminal device receives these pre-computed offset values along with their associated time point indicators, allowing it to determine the appropriate offset for future uplink transmissions without requiring frequent real-time updates from the network device. This preliminary provision of data resolves the contradiction by reducing the need for frequent signaling updates while maintaining accuracy.
Solution Approach 2:
The system dynamically selects the appropriate timing advance offset value based on the current time point and the terminal device's uplink transmission timing. The terminal device compares the current time with multiple stored time point indicators associated with different offset values, and selects the most appropriate offset for the current conditions. This dynamic selection mechanism allows accurate timing advance determination without requiring continuous system information updates.
2Manufacturing precision
If the timing advance calculation uses real-time location data, then the uplink signal alignment accuracy is improved, but the computational complexity and processing time increase
Solution Approach 1:
The network device performs the complex location calculations and timing advance offset computations in advance, before the terminal device needs to transmit uplink data. The pre-calculated offset values are provided to the terminal device with associated time point indicators. This shifts the computational burden to the network device and eliminates the need for real-time calculations at the terminal, resolving the contradiction between accuracy and computational complexity.
Solution Approach 2:
Instead of performing complex real-time location and timing calculations, the terminal device uses pre-provided timing advance offset values that are copies of the network device's calculations. The terminal device simply selects and applies the appropriate pre-computed offset value based on time point comparison, avoiding the need to perform complex geometric and temporal calculations itself. This copying approach maintains accuracy while reducing terminal device complexity.
Data Source
AI summary
A communication method and apparatus, where a terminal device determines a location of an NTN device in an NTN. The method includes a network device sending system information to the terminal device, where the system information includes a location parameter of an NTN device, and where the system information is used to indicate time information of the location parameter.