Aperiodic PRS Reporting for Wireless Positioning Accuracy
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the position of user equipment (UE) due to limitations in existing positioning schemes, such as high positioning errors and increased complexity and battery consumption in in-building environments, particularly with the OTDOA scheme based on positioning reference signals (PRS).
Innovation Solution
A method for reporting measurement results for position determination in a wireless communication system, involving the use of reference signal time difference (RSTD) mapping tables, aperiodic PRS transmission, and blind detection, to improve positioning accuracy and efficiency by allowing UE to select appropriate RSTD mapping tables and request aperiodic PRS transmission based on measurement quality and uncertainty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aperiodic PRS transmission is implemented to improve positioning accuracy, then positioning errors are reduced, but network data transfer losses increase
Solution Approach 1:
The patent implements dynamic PRS transmission by allowing aperiodic PRS to be transmitted only when positioning accuracy requirements are not met with periodic PRS alone. The eNB determines whether to trigger aperiodic PRS based on current positioning needs, making the transmission schedule flexible and adaptive rather than fixed, thus reducing unnecessary data transfer while maintaining positioning accuracy when needed.
Solution Approach 2:
The patent changes the transmission parameter of PRS from purely periodic to aperiodic by introducing a trigger mechanism. When the eNB determines that positioning accuracy is insufficient, it triggers an aperiodic PRS transmission with different timing parameters than the periodic PRS, allowing the system to adapt transmission parameters dynamically based on positioning performance requirements.
2Measurement precision
If multiple RSTD mapping tables are used to improve positioning accuracy, then positioning errors are reduced, but device complexity increases
Solution Approach 1:
The patent segments the RSTD mapping process by dividing it into multiple separate mapping tables, each optimized for specific RSTD ranges or conditions. Instead of using a single complex mapping table, the system creates multiple simpler tables that can be selectively applied, reducing the complexity of individual tables while maintaining or improving overall positioning accuracy through the segmented approach.
Solution Approach 2:
The patent implements dynamic selection of RSTD mapping tables based on current measurement conditions. The UE or eNB determines which mapping table to use based on the measured RSTD values and positioning requirements, making the mapping process adaptive rather than static. This dynamic approach allows the system to use the most appropriate mapping table for each measurement scenario, improving accuracy without requiring all tables to be simultaneously active.
Data Source
AI summary
A method for reporting a measurement result for determining a position in a wireless communication system, according to one embodiment of the present invention, is performed by a terminal and may comprise the steps of: receiving positioning reference signal (PRS)-related information comprising a position identifier of each of a plurality of base stations; performing a measurement on the PRSs transmitted by each of the plurality of base stations; if the position identifier of each of the plurality of base stations are identical to each other, selecting at least one measurement result among the measurement results for the PRSs; and reporting the selected measurement result to a serving base station.