Ionosphere Correction File Refresh for Low-Power Mobile GNSS
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Solution Overview
Problem
Existing wireless communication networks face challenges in providing real-time, precise ionosphere corrections for mobile devices due to the high power consumption and inefficiencies of continuous data streaming for ionosphere modeling, which are exacerbated by advanced communication standards like 5G NR and the limitations of existing GNSS positioning techniques.
Innovation Solution
Implementing an 'integrate and dump' mechanism where ionosphere correction data is precached into small files by I&D servers, refreshed every 3 minutes, allowing mobile devices to download these files on-demand, reducing power consumption and maintaining accuracy through spherical harmonic expansions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous data streaming is used for ionosphere modeling, then real-time correction accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by refreshing ionosphere correction files at specific intervals (e.g., every 3 minutes) rather than using continuous data streaming. The system determines whether a file refresh is needed based on timing conditions, allowing the mobile device to enter low-power states between refreshes while still maintaining accurate corrections through periodic updates.
2Measurement precision
If ionosphere correction files are refreshed frequently, then correction accuracy is improved, but network overhead and processing costs increase
Solution Approach 1:
The system employs feedback mechanisms where the network side determines file refresh timing based on actual ionosphere variation conditions. The network evaluates whether the current time meets refresh conditions and only triggers file updates when necessary, avoiding unnecessary network transmissions and processing while maintaining correction accuracy when conditions warrant it.
Data Source
AI summary
Described herein are solutions for real-time precise ionosphere corrections. An integrate and dump (I&D) server can receive a Networked Transport of Radio Technical Commission For Maritime Services (RTCM) via Internet Protocol (NTRIP) bit stream of a spherical harmonic model for precise point positioning (PPP). The model can be a vertical total electron content (VTEC) spherical harmonic expansion model and/or can include a set of ionosphere coefficients for correcting errors in satellite signals due to ionospheric conditions. The I&D server can generate a file of ionosphere coefficients, according to a refresh timer, and can send the file to a content delivery network (CDN) for distribution to user equipment (UEs) upon request. These and many other features and examples are described herein.