NTN UE Position Reporting With GNSS Threshold and Periodic Updates
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for UE position determination and reporting in non-terrestrial networks (NTN), leading to battery drain, inaccurate position updates, and excessive signaling, which affect operations such as timing advance, synchronization, and handover.
Innovation Solution
Implementing a system where the UE determines its position based on GNSS and reports it to the network using optimized periodicity, transformed coordinates, and incremental reporting, with signaling mechanisms tailored for different RRC states and security levels, reducing unnecessary processing and conserving battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE continuously determines and reports its position using GNSS in NTN, then the network has accurate position awareness for timing advance and synchronization, but the UE battery is drained excessively
Solution Approach 1:
The patent implements periodic position reporting where the UE determines its position using GNSS at specified intervals rather than continuously. The network configures reporting periodicity through RRC signaling, allowing the UE to enter low-power states between measurements while maintaining sufficient position accuracy for NTN operations such as timing advance adjustments and handover decisions.
Solution Approach 2:
The patent applies partial action by reporting position information selectively based on change thresholds. Instead of reporting every position update, the UE only reports when the position change exceeds a configured threshold, reducing unnecessary transmissions and processing while maintaining adequate network awareness for critical functions.
2Measurement precision
If the UE reports detailed position information frequently, then the network has precise location awareness, but the signaling overhead increases excessively
Solution Approach 1:
The patent extracts and reports only the essential position information needed for NTN operations. Instead of transmitting complete GNSS coordinate sets frequently, the system extracts key parameters such as position changes exceeding thresholds or periodic position updates, significantly reducing signaling overhead while maintaining sufficient accuracy for timing advance and handover functions.
Solution Approach 2:
The patent changes the parameter representation of position information by using relative position changes or differential reporting instead of absolute coordinates. This allows the network to track UE position effectively with fewer bits and less signaling, as only changes above a configured threshold need to be reported.
3Productivity
If the UE processes and reports position information continuously, then the network maintains real-time location awareness, but the UE computational load and battery consumption increase
Solution Approach 1:
The patent implements periodic position determination and reporting cycles configured by the network. The UE activates GNSS processing at specified intervals, performs position calculations, and reports only when necessary, allowing the processor to remain in low-power states between measurements and significantly reducing overall energy consumption while maintaining adequate position awareness for NTN operations.
Solution Approach 2:
The patent enables the UE to autonomously determine when position reporting is necessary by comparing current position against previous positions and configured thresholds. This self-service mechanism eliminates the need for continuous network-requested reporting, allowing the UE to manage its own processing and power consumption based on actual position change requirements.
Data Source
AI summary
Methods and apparatuses for reporting UE location information in a wireless communication system. A method of operating a UE comprises: receiving, from a base station (BS) in a non-terrestrial network (NTN), a message requesting to report the UE location information; generating, based on a positioning operation, first UE location information; generating second UE location information that is derived from the first UE location information; and transmitting, to the BS, the second UE location information as the UE location information.