Adaptive NTN PRS Configuration and Reporting for Doppler-Aware Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in NTN due to high Doppler shift, long propagation delays, and moving TRPs, which complicate accurate and low-latency positioning measurements and reporting, especially in rural and remote areas with sparse cellular coverage.
Innovation Solution
Adaptive PRS configuration and reporting mechanisms are implemented to account for Doppler shifts, timing drifts, and mobility patterns, incorporating extended response times and specific triggering criteria for UE measurements in NTN systems, utilizing RAT-dependent positioning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional positioning methods are used in NTN, then positioning functionality is provided, but positioning accuracy and latency performance deteriorate due to high Doppler shift, long propagation delays, and moving TRPs
Solution Approach 1:
The patent implements dynamic PRS configuration where parameters such as periodicity, bandwidth, and resource allocation are adaptively adjusted based on satellite mobility patterns, Doppler shift variations, and propagation delay changes. This allows the positioning system to maintain accuracy despite the dynamic NTN environment while optimizing response times
Solution Approach 2:
The patent modifies key positioning parameters including PRS periodicity, bandwidth allocation, and timing advance values to account for NTN-specific conditions. By changing these parameters dynamically based on satellite position, velocity, and signal characteristics, the system achieves accurate positioning measurements despite long propagation delays and high Doppler effects
2Productivity
If PRS configuration is optimized for low-latency positioning, then positioning speed improves, but system complexity increases due to need for adaptive configuration and extended response times
Solution Approach 1:
The patent performs preliminary configuration of PRS parameters and positioning protocols before actual positioning measurements begin. By pre-configuring resource allocations, periodicity settings, and reporting intervals based on predicted satellite trajectories and service requirements, the system reduces real-time complexity while maintaining fast response capability
Solution Approach 2:
The patent designs a unified PRS configuration framework that serves multiple positioning scenarios (terrestrial and non-terrestrial) and multiple satellite types (LEO, MEO, GEO) through a single adaptive mechanism. This multi-functional approach reduces overall system complexity by avoiding separate configuration schemes for different NTN scenarios
3Measurement precision
If positioning measurements are performed with extended response times for NTN, then measurement accuracy improves, but coverage efficiency in rural and remote areas deteriorates
Solution Approach 1:
The patent implements periodic PRS transmissions with optimized periodicity values that balance measurement accuracy requirements with coverage efficiency. By using appropriate periodic intervals adapted to satellite pass durations and service requirements, the system achieves accurate positioning measurements while maintaining effective coverage in rural and remote areas with intermittent satellite visibility
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and low-latency positioning in NTN environments, improving coverage in rural areas and addressing the unique challenges of satellite movements and propagation delays.
Implementation Method 1
satellites or any other non-terrestrial transmit-receive points (NT-TRPs), may be moving at high speeds, for example in the case of low-earth orbit (LEO) and medium-earth orbit (MEO) satellite systems. Other non-terrestrial systems, such as geosynchronous satellite systems, may also introduce wireless communication challenges due to NT-TRP movements.
Implementation Method 2
In an NTN, propagation delays can be orders of magnitude longer than those in a typical terrestrial network (TN).
Data Source
AI summary
Various aspects of the present disclosure relate to a UE that receives, from a location server of a non-terrestrial network, first control signaling indicating a first PRS configuration that includes positioning assistance data and measurement reporting configuration. The UE also receives second control signaling indicating a second PRS configuration that indicates adapted PRS information based at least in part on mobility, an interference level, and/or a propagation delay pattern. The UE also receives third control signaling indicating a third PRS configuration that includes a duration for reporting a measurement of reference signals based at least in part on the adapted PRS information. The UE transmits, to the location server of the NTN, a report indicating the measurement of the reference signals and/or a location estimate based at least in part on the duration for the reporting.