Terminal Position Reporting via Timing Advance Threshold
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Solution Overview
Problem
Existing methods for reporting position information in satellite communication networks trigger position information reporting excessively due to variations in timing advance (TA) caused by satellite movement, leading to resource wastage.
Innovation Solution
A method and device where a terminal device reports its position information only when a timing advance (TA) variation value caused by its own position change exceeds a threshold value, thereby excluding the impact of satellite movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If position information reporting is triggered based on TA variation, then position information can be updated, but excessive reporting occurs due to satellite movement causing resource wastage
Solution Approach 1:
The patent changes the parameter used for triggering position information reporting from raw TA variation to TA variation normalized by satellite position. By dividing the TA variation by the satellite's position change, the system can distinguish between actual terminal movement and satellite movement, thereby reducing unnecessary reporting while maintaining position information accuracy.
Solution Approach 2:
The patent introduces an intermediary factor - the satellite's position change - to mediate between the terminal's TA variation and the reporting trigger. This intermediary allows the system to filter out false triggers caused by satellite movement and only initiate reporting when the terminal actually moves, thus reducing resource wastage.
2Measurement precision
If position information is reported frequently to track terminal movement, then position tracking accuracy is improved, but network resources are consumed excessively
Solution Approach 1:
The patent transforms the reporting trigger parameter from absolute TA variation to relative TA variation normalized by satellite position. This parameter change enables the system to maintain position tracking accuracy by only reporting when the terminal actually moves, while improving network resource efficiency by eliminating redundant reports caused by satellite movement.
Solution Approach 2:
The patent applies partial action by using a threshold-based trigger mechanism. Instead of reporting on every TA variation, the system only reports when the normalized TA variation exceeds a predetermined threshold, indicating actual terminal movement. This partial reporting approach maintains sufficient position tracking accuracy while significantly reducing network resource consumption.
Data Source
AI summary
A method for reporting position information, performed by a terminal device, including: determining that a timing advance (TA) variation value corresponding to the terminal device is greater than a threshold value, where the TA variation value is caused by a change in a position of the terminal device; and reporting position information of the terminal device to a network device.