OTDOA Reference Anchor Selection for Moving NTN Satellites
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Solution Overview
Problem
Existing OTDOA methods assume stationary anchor points, which is invalid in non-terrestrial networks, leading to inaccurate position estimation due to non-stationary components like satellites.
Innovation Solution
A positioning server selects a reference anchor point based on the type and expected quality of signals from terrestrial or non-terrestrial points, optionally using a timestamp to account for motion, ensuring accurate location calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing OTDOA methods are used with non-terrestrial anchor points, then the positioning method can be applied to non-terrestrial networks, but the positioning accuracy deteriorates due to the invalid assumption of stationary anchor points
Solution Approach 1:
The patent applies the Dynamics principle by transitioning from the static assumption of stationary anchor points to a dynamic model that accounts for the motion of non-terrestrial anchor points. The positioning method now considers the velocity and acceleration of satellite-based anchor points, allowing the system to adapt to their changing positions over time and maintain positioning accuracy in non-terrestrial networks.
2Adaptability or versatility
If a reference anchor point is selected from non-terrestrial components, then the positioning method can operate in NTN environments, but the reliability of position estimation deteriorates due to non-stationary behavior
Solution Approach 1:
The patent applies the Preliminary action principle by pre-compensating for the motion effects of non-terrestrial anchor points. The system calculates and applies corrections based on the expected motion of satellites before performing the position estimation, thereby maintaining reliability even when using moving reference points in NTN environments.
Data Source
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AI summary
A positioning server is configured to determine a set of anchor points to be used in a positioning method for a user equipment, wherein each of the anchor points is associated with a type of anchor point comprising a terrestrial type or a non-terrestrial type, select a subset of the set of anchor points based on the types of the anchor points, select one anchor point from the subset of anchor points as a reference anchor point based on an expected quality of a positioning reference signal (PRS) transmission received from the anchor point, transmit to the UE a PRS configuration for each of the anchor points and indicating to the UE the reference anchor point and instruct each of the anchor points to transmit respective PRSs in accordance with the PRS configuration.