Non-Terrestrial Network Positioning via Partial Ephemeris Data
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Solution Overview
Problem
Non-terrestrial wireless communication networks face challenges in efficiently transmitting location information due to large distances and high mobility, leading to low signal strength and significant latency, which complicates accurate positioning and synchronization between user equipment (UE) and network nodes.
Innovation Solution
The system reduces signaling by having network nodes in non-terrestrial networks transmit partial position or velocity information, allowing user equipment to compute the remaining values, thereby decreasing data payload and bandwidth usage while maintaining accurate ephemeris information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If network nodes transmit complete position information (all three coordinates), then positioning accuracy is improved, but signaling overhead and bandwidth usage increase
Solution Approach 1:
The patent extracts only the essential positioning parameters needed for accurate location determination. Instead of transmitting all three coordinates (x, y, z), the system transmits only two coordinates and derives the third from known orbital parameters, thereby reducing data payload while maintaining positioning accuracy.
Solution Approach 2:
The user equipment performs self-computation to derive the missing coordinate from the transmitted partial position information and known orbital parameters. This self-service approach eliminates the need for the network to transmit redundant information, reducing signaling overhead while enabling accurate positioning.
2Measurement precision
If network nodes transmit complete velocity information (all three velocity vectors), then synchronization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary velocity parameters for accurate synchronization. Instead of transmitting all three velocity vectors (Vx, Vy, Vz), the system transmits only two velocity vectors and derives the third from orbital mechanics principles, reducing data payload while maintaining synchronization accuracy.
Solution Approach 2:
The user equipment computes the missing velocity vector component using the transmitted partial velocity information and orbital parameters. This self-computation approach reduces signaling overhead while enabling accurate Doppler shift compensation and synchronization.
3Reliability
If more position and velocity information is transmitted, then communication reliability is improved, but bandwidth usage and latency increase
Solution Approach 1:
The patent extracts the minimum necessary information set that maintains communication reliability. By transmitting only two coordinates and two velocity vectors along with correction values, the system reduces data payload and transmission time while preserving the reliability needed for accurate positioning and synchronization in NTN environments.
4Measurement precision
If correction values and signs are transmitted for derived parameters, then measurement precision is improved, but data payload increases
Solution Approach 1:
The patent applies partial correction by transmitting only the necessary correction values and signs for the derived parameters rather than complete correction data. This partial action approach maintains positioning precision while minimizing the additional data payload required.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network node and a user equipment (UE) may establish a connection between the UE and the network node of a non-terrestrial network. The UE may receive, from the network node and based on a type of orbit around Earth of the network node, a first value or the first value and a second value associated with a position or a velocity of the network node relative to a terrestrial-based reference. The UE and the network node may communicate based on the position or the velocity of the network node, or both. In some cases, the position or the velocity of the network node is based on an altitude of the network node, the first value, the second value, and a third value.