HAPS Timing Delay Compensation via Lookup Tables
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Solution Overview
Problem
High altitude platform systems (HAPS) and non-terrestrial networks (NTNs) introduce transparent processing delays that can lead to errors in positioning and timing estimation, particularly in scenarios requiring high accuracy.
Innovation Solution
A method and apparatus that determine if a user equipment (UE) is configured to perform positioning using a transparent non-terrestrial network node, calculate a transparent processing delay using a look-up table, and transmit signal assistance data comprising the delay to correct timing estimations and improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transparent non-terrestrial network nodes are used for positioning, then coverage area is extended to remote locations, but timing accuracy deteriorates due to transparent processing delays
Solution Approach 1:
The patent pre-calculates transparent processing delays for various operating conditions (frequency bands, bandwidths, power amplifiers) and stores them in lookup tables before actual positioning operations. This preliminary preparation allows the UE to quickly retrieve and apply the appropriate delay compensation value without real-time calculation, thereby maintaining timing accuracy while using transparent NTN nodes for extended coverage.
Solution Approach 2:
The patent introduces lookup tables as an intermediary mechanism between the transparent NTN node and the UE positioning function. The lookup tables serve as a pre-computed reference that mediates the timing delay issue by providing ready-made compensation values, eliminating the need for complex real-time delay measurement and calculation during positioning operations.
2Measurement precision
If transparent processing delay compensation is implemented, then positioning accuracy is improved, but system complexity increases due to lookup table management
Solution Approach 1:
The patent extracts the complex delay compensation calculations from the real-time positioning process and places them into separate lookup tables. This separation allows the main positioning algorithm to remain simple while the delay compensation functionality is handled by pre-computed tables, reducing the computational burden and complexity of the real-time positioning system.
Solution Approach 2:
The patent manages complexity by organizing lookup tables according to specific parameters (frequency band, bandwidth, power amplifier configuration). This parameter-based organization allows the system to handle different operating conditions through structured data management rather than complex computational logic, making the system more manageable and easier to implement.
3Adaptability or versatility
If delay compensation calculations are performed in real-time, then adaptability to changing conditions is improved, but processing time increases
Solution Approach 1:
The patent pre-calculates and stores delay compensation values for various operating conditions in lookup tables before actual positioning operations. This preliminary preparation eliminates the need for real-time calculations, allowing the system to quickly adapt to different conditions by simply retrieving pre-computed values, thereby maintaining both adaptability and speed.
Solution Approach 2:
The patent creates a dynamic system where the UE can switch between different lookup tables based on current operating conditions (frequency band, bandwidth, power amplifier). This dynamic table selection approach provides adaptability to changing conditions without requiring real-time calculations, as the appropriate pre-computed table is simply selected and applied.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for mitigating timing delays in positioning with HAPSs and NTNs. One method may include an LMF receiving a look-up table (303) from a NTN, performing an online re-calibration (309), calculating a transparent processing delay (311), and/or transmitting signal assistance data to a UE as part of new assistance data based upon the received look-up table.