Dynamic PRS Update for Mobile UE Positioning Accuracy
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Solution Overview
Problem
Current positioning reference signal (PRS) transmission methods in LTE are inadequate for mobile UEs, leading to low accuracy, and 5G NR aims to improve this by supporting mobile UEs with higher accuracy, but requires dynamic updating of PRS transmissions due to UE mobility and changing radio environments.
Innovation Solution
A method for dynamically updating PRS transmissions based on UE location, involving continuous positioning configurations, assistance measurements, and signaling exchanges between the UE and the network to adjust PRS resources and beams for optimal signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS transmissions are updated dynamically based on UE location, then positioning accuracy is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic PRS transmission by allowing the network to update PRS resources and beams based on real-time UE location information. The positioning configuration can be adjusted dynamically through RRC signaling, enabling the system to adapt to mobile UE scenarios while maintaining positioning accuracy through continuous location-based updates.
Solution Approach 2:
The patent changes key parameters including PRS resource configurations, beam directions, and periodicity based on UE location updates. By modifying these parameters dynamically according to UE mobility state and location, the system achieves accurate positioning for mobile devices while optimizing resource usage and managing signaling overhead.
2Measurement precision
If PRS transmissions are updated frequently to track mobile UE, then positioning accuracy is improved, but network energy consumption increases
Solution Approach 1:
The patent employs periodic PRS transmissions with configurable periodicity that can be adjusted based on UE mobility characteristics. For mobile UEs, shorter periodicities are used to track location changes, while for stationary or slow-moving UEs, longer periodicities reduce network energy consumption. The system dynamically adapts the periodicity parameter to balance positioning accuracy requirements with energy efficiency.
Solution Approach 2:
The patent applies partial updates of PRS configurations rather than complete reconfigurations. When UE location changes occur, only the necessary PRS parameters (such as beam directions or specific resource allocations) are updated, rather than refreshing all PRS transmissions. This partial action approach maintains positioning accuracy while significantly reducing network energy consumption compared to full periodic reconfigurations.
Data Source
AI summary
A method, apparatus, and a computer-readable storage medium are provided for dynamic updating of PRSs. In an example implementation, the method may include a user equipment receiving continuous positioning configuration, wherein the continuous positioning configuration comprises a periodic reporting configuration and/or an event-based reporting configuration. The method may further include performing assistance measurements based at least on the continuous positioning configuration and transmitting a measurement report to a network entity, the measurement report based at least on the assistance measurements. In another example implementation, the method may include a gNB receiving one or more updated positioning reference signal resources from the location server and transmitting an updated positioning reference signal to a user equipment, the updated positioning reference signal transmitted using the one or more updated positioning reference signal resources.