Polynomial Timing Advance for Non-Terrestrial Networks
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Solution Overview
Problem
In non-terrestrial networks, particularly those involving satellites, the determination of timing advance is challenging due to long propagation delays and the need for accurate synchronization of uplink transmissions, with existing methods like Taylor series approximations leading to significant approximation errors and increased signaling overhead.
Innovation Solution
A network node determines coefficients for a polynomial that approximates the timing advance component between the network node and a satellite to minimize approximation error over a validity interval, transmitting these coefficients to user equipment for accurate timing adjustment, thereby reducing errors and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Taylor series approximation is used for timing advance determination, then the timing advance can be calculated, but significant approximation errors occur
Solution Approach 1:
The patent changes the approximation method from Taylor series to polynomial fitting with optimized coefficients. By determining coefficients that minimize approximation error across multiple time instances rather than using fixed Taylor series derivatives, the timing advance calculation achieves higher accuracy and reliability in NTN environments.
2Reliability
If traditional timing advance methods are used, then synchronization can be maintained, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential polynomial coefficients needed for timing advance calculation and transmits them to user equipment. This selective transmission of minimal necessary information reduces signaling overhead while maintaining synchronization accuracy, as the UE can locally compute timing advance using the received coefficients without requiring continuous detailed signaling.
Data Source
AI summary
The present disclosure relates to a network node and a user device, as well as to methods for execution on a network node, a user device or on integrated circuitry for determining of a common timing advance component for a non-terrestrial network. In particular, for a validity interval, coefficients of a polynomial are determined which are approximating a timing advance component between the network node and a satellite, so as to minimize an approximation error, wherein the approximation error is specified in a plurality of time instances of the validity interval relative to a reference time instance. The coefficients are provided from a network node to user device and used to approximate the timing advance.