TA-Based Positioning Signaling for Multi-Satellite NTN Accuracy
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Solution Overview
Problem
Current wireless communications systems do not support timing advance (TA) based positioning procedures in non-terrestrial networks (NTN), which can lead to inaccurate and inefficient device location determination due to limited satellite coverage and lack of regulatory positioning parameters.
Innovation Solution
Implementations provide signaling and procedural enhancements for TA-based positioning, including assistance configuration messages, capability exchanges, and parameter configurations for single and multiple satellite systems, using LPP and NRPPa protocols to enable accurate location estimation in NTN networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TA-based positioning procedures are implemented in NTN networks, then positioning accuracy is improved, but device complexity increases due to additional signaling and procedural requirements
Solution Approach 1:
The positioning procedure is segmented into distinct phases: capability exchange phase (where UE and network exchange TA positioning capabilities), assistance data configuration phase (where network provides satellite ephemeris and timing parameters), and measurement execution phase (where UE performs TA measurements and reports). This segmentation allows complex positioning functionality to be managed through structured, manageable steps.
Solution Approach 2:
The patent implements preliminary capability exchange between UE and network before actual positioning measurements. The network provides assistance data including satellite ephemeris information, timing parameters, and measurement configurations in advance. This preliminary preparation reduces the complexity of real-time positioning operations by pre-establishing all necessary parameters and protocols.
2Measurement precision
If multiple TA measurements at different time instances are performed, then positioning accuracy is improved, but measurement time and latency increase
Solution Approach 1:
The network provides assistance data including satellite ephemeris information and timing parameters in advance, before the measurement period begins. This preliminary provision of reference data allows the UE to perform measurements more efficiently without needing to wait for real-time data transmission, thereby reducing overall measurement latency while maintaining accuracy through multiple time instances.
Solution Approach 2:
The patent enables continuous measurement execution across multiple time instances by establishing persistent measurement configurations and reference parameters. The UE can continuously perform TA measurements using pre-configured parameters without repeated setup overhead, maintaining measurement continuity and reducing total time consumption while gathering sufficient data for accurate positioning.
Data Source
AI summary
Various aspects of the present disclosure relate to methods, apparatuses, and systems that support TA for positioning. For instance, implementations provide a set of signalling and procedural enhancements to enable the support of timing advance (TA) based and/or TA-assisted positioning procedures over non-terrestrial supported networks. Further, application and configuration aspects for TA-based and/or TA-assisted positioning are provided for both single and multiple satellite systems.