GNSS Position Fix Triggering Using Validity Duration Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly in non-terrestrial networks (NTN), face challenges in efficiently managing Global Navigation Satellite System (GNSS) position fixes due to large time delays and Doppler frequency shifts, leading to high power consumption and increased signaling overhead when UEs frequently re-acquire GNSS in idle states, which can cause radio link failures.
Innovation Solution
UEs report GNSS validity duration information to the base station, allowing the network to periodically or aperiodically trigger GNSS position fix attempts, reducing the need for UEs to constantly re-acquire GNSS in idle states and optimizing power consumption and signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE frequently re-acquires GNSS position fix to maintain accurate positioning, then positioning accuracy is improved, but power consumption increases and radio link stability deteriorates
Solution Approach 1:
The system implements periodic GNSS position fix re-acquisition based on validity duration reporting. The UE reports when the current position fix becomes invalid, and the base station schedules re-acquisition only at these periodic intervals rather than continuously, reducing power consumption while maintaining positioning accuracy.
Solution Approach 2:
The UE provides feedback to the base station about GNSS position fix validity status through uplink reports. This feedback mechanism allows the base station to make informed scheduling decisions about when re-acquisition is necessary, avoiding unnecessary re-acquisitions that would consume power and cause radio link interruptions.
2Reliability
If the UE re-acquires GNSS position fix frequently to maintain connectivity in NTN, then connection reliability is improved, but signaling overhead increases and system efficiency deteriorates
Solution Approach 1:
The patent extracts and reports only the critical validity duration information to the base station, rather than transmitting complete GNSS position fix data or continuous status updates. This selective information extraction reduces signaling overhead while maintaining connection reliability through targeted re-acquisition triggers.
3Reliability
If the UE performs continuous GNSS monitoring to detect position fix validity, then positioning reliability is improved, but device complexity and processing load increase
Solution Approach 1:
The UE autonomously monitors its own GNSS position fix validity and self-determines when re-acquisition is needed based on internal validity duration tracking. This self-service approach eliminates the need for complex network-controlled monitoring mechanisms while maintaining positioning reliability through UE-initiated validity reporting.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. In certain configurations, the UE determines a global navigation satellite system (GNSS) validity duration or a remaining GNSS validity duration indicating a time duration for which a GNSS position fix is valid. The UE reports, to a base station, GNSS assistance information including the GNSS validity duration or the remaining GNSS validity duration. The UE attempts to acquire, at the UE and in a radio resource control (RRC) connected state, the GNSS position fix periodically or aperiodically.